Applications Hammer crushers are primarily used for breaking materials with a compression strength that is less than 200MPa, such as limestone, gypsum, coal, marlstone and sandy shale in cement industries. The hammer crusher can crush the raw ore into small particles of 25mm in a single process, which simplifies the process when compared to traditional multi-stage crushing, thus saving customer investment costs. The hammer crushing equipment can also be added to a complete production line.
The crushing plate is placed directly in front of the rotor, and the material size to be delivered is determined by the gap between the crushing plate and rotating motor circle. It is made of a high manganese steel through a casting process, with the maximum clearance designed to be the same as the maximum size of the discharged materials.
The grate is composed of cast high manganese steel grate bars. These grate bars are mounted at bottom of the rotor, covering almost all working surfaces with laying in a circumferential direction, thus wet materials can be easily removed.
By outfitting this equipment with a security door, foreign materials will be immediately discharged using centrifugal force, with the door automatically closing to prevent unprocessed materials from accidentally being removed. The security door can usually be left open when the required discharge size is large.
Sinoma-Liyang Heavy Machinery Co., Ltd. (SINOMALY) Add.: No.11, Binhe Road, Tianmu Lake Industrial Park, Liyang, Jiangsu, China Contact Person: Mr. Chen / Ms. Qian Tel.: (Mr. Chen) (Ms. Qian) Fax: E-mail: [email protected]
As important mining equipment for the underground coal mine coal transportation system, hammer crusher is usually installed in the middle section of the coal transportation system. Raw coal in the middle of the transportation is crushed into small pieces by a hammer crusher and then transported to the ground coal yard. The coal mine hammer crusher consists of the bottom trough, the crushing frame body, the breaker shaft, the transmission device, the adjusting device and the lubrication system. It has no transfer function and needs to be connected with the crushing bottom trough. The hammer crushing frame body is located at the upper part of the bottom groove, and a crusher shaft is installed in the middle of the frame body. Buy hammer crusher
The mechanism of action is that the broken hammer shaft is lifted to a certain height through the transmission device, thereby increasing the gravitational potential energy. After the falling, the hammer head impacts and squeezes the raw coal at the bottom groove, and is crushed to a smaller particle size, which is convenient for continuous transfer of the transfer machine. The coal mine hammer crusher can adopt two different transmission forms of pulley and reducer according to the power of the equipment. Normally, the pulley drive is only used for hammer crushers up to 250 kW, and hammer crushers larger than 250 kW are driven by reducers.
(1) Design processing defects. The design should ensure that the structure of the equipment is stable and the dynamic characteristics are good. Unreasonable mechanical construction will lead to local stress concentration in the hammer crushers, affecting the dynamic characteristics, and thus may cause undesirable phenomena such as forced vibration or self-excited vibration. (2) Installation, commissioning, and maintenance procedures. In the installation, commissioning and maintenance stages of the hammer crusher, the installation of each spare part may be misplaced. The coordination and installation positions of the shaft system in the transmission system are not suitable, the adjustment of the geometric parameters of the whole equipment is not in place, the installation position of the moving cone is unreasonable, etc., and then It may cause problems such as large equipment load and poor stability of the running state. (3) Human error. In the process of human operation, the equipment is abnormally opened, closed and the speed is not properly adjusted. The hammer crusher runs beyond the design working condition for a long time, the equipment lacks maintenance, and the lubrication between the various components is insufficient. It is also a factor causing the hammer crusher to malfunction. (4) Wear and deformation of the components. The hammer crusher runs for a long time, and various components are prone to different degrees of wear and deformation. Individual parts may be detached, cracked or even damaged by vibration, and the deflection of components such as moving cones may change. Parts may also be pitting or corroded by the external environment, or may wear out with other parts or be affected by vibration. Uneven settlement of the location; at the same time, the gap between the individual parts increases, the looseness of the fit, the friction of the mating surface decreases, etc., which will affect the normal operation of the hammer crushers.
The vibration and moving cone action of the hammer crusher will cause the moving cone to wear, which will cause the center of gravity of the moving cone to shift to form an eccentricity, resulting in an unbalanced moving cone. The problems caused by the imbalance of the hammer crushing motor cone are: (1) The moving cone produces an eccentricity, which changes the force state of the rotor to make it unevenly stressed. During the rotating motion, the moving cone repeatedly bends. When the fatigue limit is reached, damage or even breakage may occur. (2) The moving cone is unbalanced, the equipment is out of the design working condition, and the vibration is caused by severe vibration, which interferes with the external environment. (3) During the working process of the rotor, deflection due to uneven force, friction with bearings or other adjacent components not only causes wear of various components in the equipment, but also affects the working efficiency of the equipment. It is a serious safety hazard and should be strengthened. Inspection and timely disposal.
In a rotor system connected by a coupling, misalignment between the two rotors causes the coupling to deflect, and the bearing that is connected is affected by the rotor misalignment, which shortens the service life, affects the oil film stability of the sliding bearing, and the overall operation of the bearing. Poor, resulting in more serious irregular vibrations. The monitoring of rotor misalignment should be increased, and the vibration amplitude and phase stability should be detected.
The rotor system of the hammer crushers is affected by factors such as rotor misalignment, bending of the shaft, looseness of the foundation, wear of the bearing, improper assembly, etc., and friction or even rubbing phenomenon with the bearing. Although the torque that the rotor is subjected to during operation of the equipment can be balanced, the rotational speed is greatly affected, the rotor system is also unstable, and the overall stability of the equipment is degraded. Main performance: First, the rotor system vibrates, and second, the rubbing has an impact on the rotor itself. The two overlap each other, resulting in more complex adverse reactions, such as phase reverse displacement and axial trajectory diffusion or disorder. In the design stage, in order to ensure the stability of the equipment, the gap between the rotating parts and the adjacent parts is relatively small, and it is easier to increase the probability of occurrence of rubbing.
Hammer crusher is rotating vibration equipment. During operation, the ground bolts used for foundation and fixation vibrate, which can easily cause the foundation sinking and the loosening of the anchor bolt connection. At the same time, the bearing seat will also be loosened by the vibration. The vibration amplitude is larger, mainly in the vertical direction. In order to determine the loosening condition of the foundation and bearing seat, the vibration signals in the vertical direction are detected and compared with the vibration signals of crusher and ground bolt. If the foundation and bearing housing are looser, there will be a great difference between the two kinds of vibration signals, so it should be dealt with in time to avoid accidents.
Hammer crusher is the key equipment for crushing large blocks of raw coal in coal mine, and is an important part of the raw coal transportation system. Design and machining defects, installation, debugging, maintenance process problems and man-made operation errors and structural wear and tear, deformation is the main source of hammer crusher fault, moving cone imbalance, rotating shaft misalignment, rotor rubbing.
Operational Characteristics:The method of operation has a considerable effect upon the nature of the product. When minimum fines are a requirement, the hammer mill should always he operated in closed circuit with a screen, or screens; the circulating load should be fairly high; speed should be as low as is consistent with physical structure of the material; and grates should be widely spaced or, in some cases, dispensed with entirely.
Although the hammer mill usually produces a relatively high percentage of fine material, it does not usually make an inordinately high proportion of what are commonly designated as extreme-fines unless the mill is adjusted and operated with that end in view. For example, if we are turning out a 0.75 (top size) product in one of these machines we will usually find the proportion of particles in the range between 0.25 and about 30 or 40 mesh to be high, as compared to the product of pressure-type crushers; but unless the material is very friable and the natural grain size very fine the percentage of minus 100- and 200-mesh particles will usually compare quite closely. Here again we have the fact that the impact effect falls off directly with the particle mass, to explain an apparent inconsistency.
It is easy to understand why the hammermill should turn out a cubical product. The impact action is ideally adapted for breaking flat or elongated spalls. If the material contains numerous parallel cleavage planes the initial blows delivered by the hammers may knock off flat spalls; but the chances are very much against such spalls getting out of the machine before they are struck several times and broken into particles of more cubical proportions.
This is especially true of machines which have a long impact zone ahead of the grate section, as no particle can possibly be discharged until it has passed through this impact section, where it will almost certainly be struck several blows.
Hammermills are capable of accomplishing: reductions very muchgreater than any other type of crushing equipment. It is possible, though not always economical, to make reductions as high as 20:1 in open circuit, and to double this performance in closed circuit. As in any other type of crusher, low reduction ratios are indicated where a low percentage of fines is desirable.
Time was when all hammermills came under the generic title of pulverizer which was quite appropriate as it aptly described the kind of work to which they were, in those days, almost exclusively applied. This duty consisted largely of such work as pulverizing limestone for various purposes: agricultural flour, glasssand, tube mill feed, and so forth. This was work for which the hammermill was and still pre-eminently well suited, and large numbers of them are used today for such service. The field has however in recent years been greatly expanded. The following list, while not comprehensive, includes some of the more important present day applications:
Not all of the uses listed can, in our opinion, be considered as economically sound applications for the hammermill. This machine cannot be expected to operate economically on abrasive feed, and it should not be so applied unless there are strong reasons for doing so. Generally this narrows itself down to cases where no other type of crusher will deliver the type of product required; occasionally the high reduction ratio of which they are capable will dictate their use in temporary jobs where the cost of a two-stage set-up of more economical operating characteristics would more than offset the cost of the single hammermill plus the expected cost of maintenance. A case in point to illustrate the latter condition is that of pilot plant testing in the development of new mining properties.
Sectional view shows how material is broken down in one type of hammermill. Material is fed to an inclined plate which is fastened to the hopper over the feed opening. This plate is so arranged that the material is evenly distributed and fed uniformly to the mill. The rapidly revolving hammers (see arrows indicating direction of rotation) strike the material a succession of heavy blows, shattering it and throwing it violently against the first involute breaker plate. Striking this plate with great farce, the material is again shattered and, as it rebounds, it is struck again and carried ta a second involute breaker plate from where it again rebounds and so on through five stages. The pulverized product passes out through grate bars In the bottom of the machine
We have never subscribed to the idea that the hammermill is suited to the primary breaking of shovel-loaded, quarry-run, or ROM mine-run rock and ore. Even though the material be non-abrasive and quite friable there are other machines which are better fitted for such work. Nor do we believe that the hammermill has a place in any of the stages of a plant intended for the production of commercial crushed stone unless the production of a high percentage of fines is not objectionable; a rather rare condition for operations of this character. These legitimate restrictions still leave quite a broad field for this ma-chine, and it is probable that more applications will crop up from time to time as our chemical industries grow.
Examination of cement plant flowsheets, discloses that, at that time, only six of these plants employed hammermills, and two of these were used in the shale crushing department. Today the hammermill is widely accepted as a secondary or tertiary crusher in cement plants throughout the country; and there are isolated instances where they perform the primary breaking as well.
The Pulverator/Impactor/Hammermill/Impact-Crusher was successfully applied to the production of manufactured sand for concrete aggregates used in the construction of a large dam in one of the eastern states. This application was made after crushing rolls had been tried and discarded because their product ran so heavily to flat spalls that a workable concrete could not be made with it. We mention this case as being indicative of the ability of the hammermill to cube material, even though the rocks physical structure is conducive to spalling or flaking. Subsequent installations for the same purpose have been equally successful.
The Dixie (Non-Clog) Hammer Mill Crusher differs from all other hammermills in that its breaker plate, instead of being stationary, is a continuously moving belt of manganese steel links. The feed thrown into the hopper is carried by a positive mechanical feed to the hammer-points and then on through the grates.
The most important results from the installation of the Dixie (Non-Clog) Hammermill are the uniform high quality of the product and the enormous crushing power, which, with reduction range of this mill, eliminate the necessity of using several units to obtain the necessary production.
The Dixie (Non-Clog) Hammermill is manufactured in fourteen different sizes, adapted to reduction of any materials containing moisture without clogging. Due to various adjustments this equipment is capable of crushing to a minimum of fines or pulverizing to a maximum of fines. The adjusting features are exclusive Dixie patents.
The non-clog moving breaker plate is a patented feature found only in Dixie Hammermills, positively eliminating all troubles and loss of production from wet or sticky materials that would continually clog any other type crusher or pulverizer. It is capable of crushing potash, salt, mica, limestone, gypsum, coal, or any similar soft material not exceeding 4 on the Mohs scale of hardness.
The Jeffrey Miracle Hammer Crusher is designed for the reduction of large pieces and large capacities of limestone, shale, slag, and cement rock. The larger sizes are built to take steam shovel size limestone, crushing it into pieces 1, 2, 3, or 4 and under, in one operation, the one unit doing the work ordinarily done by two or more of other types of crushers. This enables large reduction of limestone and other materials to a uniform size with minimum initial and production costs. All parts are extra heavy to withstand heavy, continuous service. The Miracle Hammer Crushers are supplied with either heavy cast iron frames or with armor-plate steel frames with manganese steel liners. These crushers are provided with a hinged breaker plate easily adjustable to compensate for wear, as well as giving easy access to working parts. The large, heavy duty crushers are frequently used in such industries as carbide, chemical and cement as a primary machine where large capacities and cubical products are desired.
The Jeffrey Heavy Duty Reversible Hammer Crusher is designed especially for reducing bituminous coal down to a product of 85% minus 1/8, at large capacities, for coking purposes. These machines are also adaptable to the reduction of abrasive materials since they are symmetrical about the vertical center line and when one corner of the hammers become worn, it is only necessary to reverse the direction of the rotor in order to use the opposite unused faces of the hammers. The frame is made of heavy welded plate steel equipped with removable manganese liners and provided with vertical hinged breaker plates to compensate for the wear on breaker plate liners.
Impact crusher and hammer crusher both use impact principle to crush materials, and the finished material has excellent particle shape. From the appearance, impact crusher and hammer crusher are similar, but they are different in many aspects, so which is better?
Hammer crusher is divided into single rotor and double rotor. The main body is composed of box, rotor, hammer head, impact lining plate, sieve plate, etc. it can directly crush the material with the maximum particle size of 600-1800 mm to 25mm or below.
In contrast, the crushing chamber of hammer crusher is smaller, the impact effect cannot be fully exerted, and the impact crusher is of multi chamber crushing structure, so the crushing is more sufficient.
The plate hammer and rotor of the impact crusher are rigidly connected. The inertia of the whole rotor is used to impact the material (free crushing, impact crushing, milling crushing), so that materials can not only be crushed but also obtain a larger speed and kinetic energy. The plate hammer is used to smash the input material from the bottom to up and throw it onto the upper impact plate.
The hammer head of the hammer crusher is used to crush the material (free crushing, impact crushing), and the speed and kinetic energy obtained by the material are limited. The hammer head striking materials along the material falling direction, with small crushing effect.
The wear of impact crusher plate hammer often occurs on the side that facing the materials, and its metal utilization rate can be as high as 45% 48%. When crushing limestone, the plate hammer of impact crusher is not seriously worn, but when crushing granite (with high hardness, it can be broken by cone crusher), the plate hammer needs to be replaced constantly.
The hammer head of hammer crusher is in a suspended state, and the wear occurs at the top, front, back and side. Compared with plate hammer, the hammer head is more seriously worn, the metal utilization rate of hammer head is about 35%, and the rotor may also be worn.
The feeding chute and the counterattack plate of the impact crusher can be equipped with heating device to prevent the material from binding, so the material with large water content can be crushed and the blocking is not easy to occur.
The impact crusher is not easy to block the material. First, it can be equipped with heating device to prevent the material from blocking due to sticking. Second, there is no grate bar at the bottom. The product size is determined by the gap between the impact plate and the plate hammer. Therefore, when handling the material with too much water content, it can avoid blocking the grate bar when crushing the wet material.
Both of them are suitable for crushing medium and hard materials, but the impact crusher is mostly used as the secondary crushing equipment. While the hammer crusher is mostly used in the cement production line, as the limestone raw material crushing equipment, or as the primary crushing equipment in the sand aggregate plant.
The compressive strength of materials suitable for hammer crusher is within 200MPa, such as coal gangue and limestone, while the compressive strength of materials suitable for impact crusher is within 350Mpa, such as gypsum, coal gangue, limestone, river pebble, sandstone, quartzite, etc. the application scope of impact crusher is wider.
In the market, the frame part of the advanced impact crusher is a three-part structure, which only needs to open the shell at the back of the crusher to replace the plate hammer, impact plate, lining plate and other maintenance operations. Moreover, there are few varieties of vulnerable parts, which is convenient for the purchase and management of spare parts.
The Joyal Hammer Crusher is widely used in the industries of mining, building materials, chemical industry, metallurgies and fodder. The Hammer Crusher is applicable for secondary and fine crushing of materials with middle or middle minus hardness such as barite, limestone, terrazzo, silicasandstone, coal, coke, gypsum, aluminum sulfate, slag, etc.
The rotor is driven by the motor to move, and the rotor drives the hammer board to rotate at a high speed, thus the materials crushed in the crushing cavity by the rotating hammer board. The end product comes out of the machine via the strips of screen. The size of the granularity can be adjusted by changing the space among the screen strips.
Glass is one of the commonly used material in people's production and daily life. It is widely used in construction, chemical, medical, automotive, engineering, instrumentation, and other industries.
Waste glass is on the rise due to the popularization of glass. Meanwhile, the recycling of glass waste reduces the discharge of garbage, achieves the goal of environmental protection, and brings good benefits for investment users.
The glass crusher can process various waste glass such as glass pieces, glass bottles, automobile glass, bulletproof glass, industrial glass tubes, and other glass products into various shapes of granular, fibrous, powdery, etc.
The traditional jaw crusher is a primary crushing equipment, and Fote Heavy Machinery has improved the jaw crusher in its design so that it can be used for fine crushing and suitable for glass recycling.
Since Fote jaw crusher has a deep crushing cavity, glass can be crushed and processed by squeezing, grinding and other methods. At the same time, glass jaw crusher has the characteristics of large crushing ratio and a wide range of application which can crush various glass such as beer bottles and automobile glass with different hardness.
Given that glass is a highly brittle material thatmay cause some splashes during the crushing process, Fote glass jaw crusher has been designed with a semi-closed vertical curtain at the feeding port, which can prevent the splash of materials, and play the role of noise reduction and dust sealing.
Theglass jaw crusher is the highly productive equipment with the capacity of1 to 500 tons per hour. And the glass crushing machine has a complete model series to meet the different needs of customers.
The glass can be easily crushed by the impact force produced by the high-speed hammerhead of the glass hammer crusher. Simultaneously, this work requires the hammerhead to have strong wear resistance.
The gap of the grate at the discharge port can be adjusted to control the product size. The glass crusher has a wide range of adaptation, advanced structural design, good sealing of frame, and produces low noise and little pollution.
Glass roll crusher has a simple design, a small footprint, and is easy to install and replace its components. It is equipped with a dustproof board, improving the sealing performance and avoiding the splash of glass dust.
The glass impact crusher can handle glass waste with large water content, if the glass material contains too much water, it could be reduced by the heating device installed on the feeding port and impact plate.
Glass impact crusher can effectively control the discharge particle size and has a wide adjusting range of discharging port. It can control the output size by adjusting the rotor speed, the impact type and the gap of the grinding chamber.
The glass crushing process has very little wear on the impact crusher. When the glass material is broken by the impact crusher, it will hit the front of the hammer plate without any touch with the back and sides of the machine.
Due to the large hammerhead of the impact crusher, its balance needs to be calibrated during installation, otherwise, the vibration force of the machine will be relatively large during operation, which may be dangerous.
The working performance of the glass compound crusher is less affected by the moisture of the material. The finished product is cubic and has large bulk density and small iron pollution, which will improve the recycling value of glass wastes.
The glass composite crusher is designed with a vertical structure, so the material may not be repeatedly crushed at a fast-passing speed, and a good crushing effect cannot be guaranteed for glass pieces.
The working mode of the crusher and the daily maintenance can respectively control and influence the crushing performance. Each type of crusher has different parameters such as crushing principle, feeding and output size.
If you have any requirements about glass crusher, please consult Fote Heavy Machinery and we will provide you with the detailed parameters and quotation of the above glass crusher online for free. If you have special material or output requirements, we can also customize the equipment parameter plan for you to offer the most suitable glass crusher. At the same time, Fote Heavy Industry provides you with free test service. Welcome to visit the factory, and Fote looks forward to cooperating with you.
As a leading mining machinery manufacturer and exporter in China, we are always here to provide you with high quality products and better services. Welcome to contact us through one of the following ways or visit our company and factories.
Based on the high quality and complete after-sales service, our products have been exported to more than 120 countries and regions. Fote Machinery has been the choice of more than 200,000 customers.
GIDC Vatwa, Ahmedabad Plot No. 291/2, Pancharatna Estate, Opposite Shayona Industrial Estate, Near Ramol Cross Road Near Ramol Over Bridge, Phase 4, G. I. D. C., Vatva, GIDC Vatwa, Ahmedabad - 382445, Dist. Ahmedabad, Gujarat
Granite is not easy to crush to sand, main equipment has PE-7501060 jaw crusher (coarse crusher), HP300 cone crusher (fine crusher), bin, 490110 vibrating feeder, B1000x22 conveyor belt, B1000x30m conveyor belt, B800x31 conveyor belt, 4YK2460 vibrating screen, etc. contact us!
In this case, we recommend the use of a PCZ1308 heavy hammer crusher with a feed size of 930x650mm, the feed particle size is less than 600mm, the motor power is 4P 132Kw, and the processing capacity of the equipment is 100-180t/h.
Eastman is a typical direct selling enterprise with green and standardized production plants. All the delivery of the equipment will be completed within the delivery period signed by the contract to ensure the smooth commissioning of the equipment.
Rock crushers have a wide range of suitable material to choose from, whether its soft or hard, or even very hard, rock crushers can reduce those large rocks into smaller rocks, gravel, or even rock dust.Here are some typical materials that break or compress by industry crushers, such as Granite, quartz stone, river pebble, limestone, calcite, concrete, dolomite, iron ore, silicon ore, basalt and other mines, rocks and slag.
Understanding the stages of crushing process and the types of crushers that best fit each stage can simplifies your equipment selection. Each type of crusher is different and used to achieve a certain end result.
Similarly, a certain output is expected at the end of each crushing stage for the next phase of the process. Aggregate producers who pair the correct crusher to the correct stage will be the most efficient and, in turn, the most profitable.
A jaw crusher is a compression type of crusher. Material is reduced by squeezing the feed material between a moving piece of steel and a stationary piece. The discharge size is controlled by the setting or the space between those two pieces of steel. The tighter the setting, the smaller the output size and the lower the throughput capacity.
As a compression crusher, jaw crushers generally produce the coarsest material because they break the rock by the natural inherent lines of weakness. Jaw crushers are an excellent primary crusher when used to prepare rock for subsequent processing stages.
Although the chamber is round in shape, the moving piece of steel is not meant to rotate. Instead, a wedge is driven around to create compression on one side of the chamber and discharge opening on the opposite side. Cone crushers are used in secondary and tertiary roles as an alternative to impact crushers when shape is an important requirement, but the proportion of fines produced needs to be minimized.
An impact crusher uses mass and velocity to break down feed material. First, the feed material is reduced as it enters the crusher with the rotating blow bars or hammers in the rotor. The secondary breakage occurs as the material is accelerated into the stationary aprons or breaker plates.
Impact crushers tend to be used where shape is a critical requirement and the feed material is not very abrasive. The crushing action of an impact crusher breaks a rock along natural cleavage planes, giving rise to better product quality in terms of shape.
Most aggregate producers are well acquainted with the selection of crushing equipment and know it is possible to select a piece of equipment based solely on spec sheets and gradation calculations. Still, theoretical conclusions must always be weighed against practical experience regarding the material at hand and of the operational, maintenance and economical aspects of different solutions.
The duty of the primary crusher is, above all, to make it possible to transport material on a conveyor belt. In most aggregate crushing plants, primary crushing is carried out in a jaw crusher, although a gyratory primary crusher may be used. If material is easily crushed and not excessively abrasive, an impact breaker could also be the best choice.
The most important characteristics of a primary crusher are the capacity and the ability to accept raw material without blockages. A large primary crusher is more expensive to purchase than a smaller machine. For this reason, investment cost calculations for primary crushers are weighed against the costs of blasting raw material to a smaller size.
A pit-portable primary crusher can be an economically sound solution in cases where the producer is crushing at the quarry face. In modern plants, it is often advantageous to use a moveable primary crusher so it can follow the movement of the face where raw material is extracted.
The purpose of intermediate crushing is to produce various coarser fractions or to prepare material for final crushing. If the intermediate crusher is used to make railway ballast, product quality is important.
In other cases, there are normally no quality requirements, although the product must be suitable for fine crushing. In most cases, the objective is to obtain the greatest possible reduction at the lowest possible cost.
In most cases, the fine crushing and cubicization functions are combined in a single crushing stage. The selection of a crusher for tertiary crushing calls for both practical experience and theoretical know-how. This is where producers should be sure to call in an experienced applications specialist to make sure a system is properly engineered.
The material passes through the feed opening into the striking arc of the rotating hammers. The hammers throw the material against the breaker plates, from where it rebounds back against the hammers. This process is constantly repeated and the impact of the pieces of material being crushed against each other reduces the material even more finely. The material is broken down until it can leave the crushing chamber through the increasingly narrower gap between the breaker plates and the rotor. The grates at the bottom can be replaced simply and employed flexibly, provide the means to achieve the targeted grain size.
- In case one side of the hammer is worn, the rotor direction can be reversed by switching the motor accordingly. This will increase the service life of the hammers and reduce downtimes during maintenance procedures.
- The body is lined with replaceable abrasion wear plates. The rotors with shaft and bearings form the heart of a hammer crusher. As a disc rotor, it is equipped with freely-swinging hammers.
- High and constant capacity - Low space requirement - High machine availability - Long lifetime - Easy replacement of wear and spare parts through hydraulic opening device - Broad range of applications - High reduction ratio
The hammer crusher is a type of ore crushing equipment. It can be used to crush medium-hard brittle materials with low water content, such as limestone, gypsum, slag, coke, coal, etc. It is widely used in cement manufacturing, chemical, electric power, metallurgy, and other industries.
Hammer crusher mainly breaks materials by the impact of hammers. The material entered into the working area of the crusher is crushed by high-speed hammers. The crushed material obtains kinetic energy from the hammers, and then it impacts on the crushing plate and grate screen at high speed and is broken for the second time. After that, the material smaller than the gap of the grate screen is discharged, and the material with larger particle size is bounced back to the lining plate and crushed by the additional impact of the hammers. The materials also impact each other during the whole crushing process in the crusher.
We take a 900 x 900mm single rotor, irreversible multi-row hinged hammer crusher as an example to introduce its structure and parts. This type of hammer crusher is commonly seen in cement plants and is suitable for crushing limestone, coal, and other medium hardness ores. It is mainly composed of a transmission device, rotor, lining plate, grate screen, and shell.
The shell is composed of the lower body, the upper rear cover, the left and the right side walls. Each part is connected by bolts. A feeding port is set on the upper part. The inner part of the shell is made of manganese steel, which can be replaced after being worn. The lower body is welded by steel plates in order to place the bearing to support the rotor on both sides of the lower body. A shaft seal device is arranged between the casing and the shaft to prevent ash leakage.
The rotor is composed of main shaft, hammer holder, and pin shaft. The hammer is suspended on the hammer holder in eight rows by the pin shaft. In order to prevent the axial movement of the hammer frame and the hammer head, both ends of the hammer frame are fixed with a compression disc and a lock nut. In addition, in order to make the rotor store a certain amount of kinetic energy in motion, flywheel or large pulley should be installed at one end of the main shaft.
The main shaft is the main part supporting the rotor, which needs to bear the mass and impact force from the rotor and hammer head in the process of operation, so its material must have high strength and toughness.
The hammer holder is used to hang the hammer heads. Although it does not directly participate in the process of crushing materials, it is still subject to the impact and friction of ore and wear, so it should be made of materials with good wear resistance.
The heavier the hammer, the more kinetic energy it possesses, and the higher the crushing efficiency. But heavy hammer also causes more damage to other parts and accelerate their wear process. The hammer weight should be able to balance the production efficiency and the wear rate.
The arrangement of grate bars of the hammer crusher is a circular arc that is perpendicular to the moving direction of hammerhead and has certain clearance with the rotary radius of rotor. The material smaller than the gap between grate bars can pass through the gap, and the material larger than the gap will be continuously impacted, ground and broken by the hammers until it can pass through the gap. Due to the impact of hard materials and metal blocks, the grate is easy to bend and break, so it needs to be inspected and replaced frequently.
The lining plate is installed inside the shell to protect it from the ore. The lining plate is cast by high manganese steel, the same material used for grate bar and hammer. The lining plate can be replaced when it is seriously worn to ensure product quality.
AGICO is a cement plant contractor focusing on cement equipment manufacturing. We supply clients with single rotor hammer crushers and installation surport. Please feel free to contact with us using the form below.
Coal hammer crusher is important equipment for crushing large raw coal. Its stable operation plays an important role in ensuring the raw coal conveying efficiency of the underground coal mine. We can put forward the corresponding solutions via analyzing the main fault sources and common faults of coal hammer mill crushers. Then improve the hammer coal mill crushers operation reliability, reduce the maintenance difficulty, and make sure the smooth progress of coal mining.
According to the working principle, coal crusher can be divided into two types: hammer crusher and jaw crusher. The hammer mill crushers have large processing capacity that max capacity is 4000tph. So the coal plant mainly uses hammer crushers to crushing raw coal. The power of the hammer crusher general is 90 ~ 400kw, which mainly depends on the rotating parts to drive the hammer up. Then crush the lump coal to the particle size which is easy to transport by the impact force of the hammer falling.
As important equipment of the underground coal mine transportation system, a coal hammer crusher is usually installed in the middle of the climbing section. The large piece of raw coal is transported to the transfer machine by the scraper conveyor and then guided into the hammer crusher by the transfer machine. The coal is crushed into small pieces by a hammer coal crusher and then transported to the ground coal yard.
The coal hammer mill crusher is composed of a bottom groove, crushing frame, hammer shaft, driving and adjusting device, and lubricating system. It has no transshipment function which needs after connecting the crushing bottom groove and connecting slot. Then uses the transshipment machine. The hammer impact crusher frame body is located on the upper part of the bottom groove and installs a crushing hammer shaft in the middle of the frame body. The mechanism is that the hammer shaft is lifted to a certain height through the transmission device which increases the gravitational potential energy. After falling, the hammerhead impacts and squeezes the raw coal at the bottom trough, crushing it to smaller particle sizes. The small coal particle is convenient for continuous conveying by the transfer machine.
According to the power of the equipment, the underground coal hammer crusher adopts two different transmission forms: pulley and retarder. In general, the belt pulley transmission is only used for power below 250kw. The power greater than 250kw is through the reducer.
Analyze fault for the large-scale, high-power hammer mill crusher, it cant diagnose specific faults. If the equipment fault is considered to be caused by the damage of a single component, the diagnosis is too one-sided. The test results may be biased, and the subsequent maintenance of the equipment may not achieve the desired repair effect. Therefore, the failure of a high-power hammer crusher should be considered from various factors, such as the design, processing, installation, commissioning and use.
The design should ensure the stability of the structure and the good dynamic characteristics of the equipment. The unreasonable mechanical structure will lead to the local stress concentration and affect the dynamic characteristics of the equipment. Then they may lead to forced vibration or self-excited vibration and other undesirable phenomena. In addition, the common design and manufacture defects include working speed and the material of the spare part can not meet the design requirements, machining accuracy is too low, poor moving cone balance performance, etc.
The hammer crusher installation, commissioning and maintenance stage may occur crusher parts installation dislocation. The transmission system with the shafting and installation location is not appropriate. The overall equipment geometric parameter adjustment is not good. The installation position of the dynamic cone is not reasonable. All the problems may lead to the equipment large load and poor stability in operation.
In the process of man-made operation, the equipment abnormal opening, closed and adjusted speed improperly. The equipment operated beyond the designed working condition for a long time. Lack of maintenance. Lubrication between the components was insufficient. These also cause the failure of the hammer crusher.
The coal hammer crusher operates for a long time, the parts are easy to wear and deformation. Individual parts may be shaken off, crack or even damage. The dynamic cone changes, spare parts will also be affected by the external environment caused by pitting or corrosion. Or with other parts wear each other. Or affected by vibration which causes uneven settlement of the ground where the equipment is located. At the same time, the increase of clearance between some spare parts, losing fit surface and lowering of fit surface friction will affect the normal work of the hammer mill.
The vibration and the movement of the dynamic cone in the operation of the hammer crusher will cause the dynamic cone ware. Then lead to the eccentricity of the center of gravity of the dynamic cone and the unbalance of the dynamic cone. The problems caused by the unbalance of the movable cone are as follows:
In the rotor system which connects with coupler, misalignment between the two rotors will cause the coupler to deflect. The bearing affected will shorten the service life, affect the stability of oil film, the operation is not smooth. We should increase the monitoring of rotor misalignment faults and focus on the detection of vibration amplitude and phase stability.
The rotor system is affected by factors such as misalignment of the rotor, bending of the shaft, loosening of the foundation, wear of the bearing, improper assembly, etc. It will rub-impact with bearings. Although the torque of the rotor can be balanced when the equipment is running, the speed is greatly affected. The rotor system is unstable, and the overall stability of the equipment decreases.
The main performance: one is the rotor system vibration, the other is the impact of rub-impact on the rotor itself. The combination of the two results in more complex adverse reactions, such as phase reverse displacement and axial trajectory diffusion or turbulence. In the design stage, in order to ensure the stability of the equipment, the gap between the rotating parts and the adjacent parts is relatively small, and the probability of the rub-impact phenomenon is more easily increased.
Oil Whirl is a phenomenon that the rotor of the transmission system moves the wedge oil film around the center of the bearing bush according to the average velocity of oil due to vibration and rotation fluctuation. The main characteristics are the smooth phase. It is obviously affected by lubricating oil characteristics. The trajectory presents a double ring ellipse. The subharmonic generated by the vibration will change with the increase of the rotational speed.
Hammer crusher is rotating vibration equipment. The foundation and fixed foundation bolt vibration during the crusher machine operating. It is easy to cause the bolt loose. At the same time, the bearing pedestal will be loose because of vibration. Vibration amplitude is large, mainly acting in the vertical direction. In order to determine the foundation and bearing pedestal looseness, the vertical vibration signals are detected and compared with the vibration signals of crusher and foundation bolt. If the foundation and the bearing seat are looser, there will be a big difference between the two vibration signals, which should be handled in time to avoid accidents.
The coal hammer crusher is the key equipment for crushing large raw coal in the underground coal. The machine is an important part of the raw coal transportation system. The common problems are design Defects, installation, debugging and maintenance problems, parts wear and deformation, movable cone unbalance, rotor rub-impact, shaft misalignment, etc.
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Hammer crusher and jaw crusher are common crushing equipment in the mine/building materials industry. They have large feed inlet and high crushing efficiency and are mainly used for coarse crushing of various ore materials. But they are different in many parts, which is better? Table of Contents 1. Different Appearance and Working Principle2. Different for Applicable Materials3. Different Discharging Adjustment Methods4. Different Structure and Wearing Parts5. Different Configuration of Production Line6. Different Application of Aggregate Line7. Which is Better, Hammer Crusher or Jaw Crusher
The appearance and working principle of the 2 crushers are different. The jaw crusher is of the curved dynamic extrusion type, and the materials are crushed in the crushing cavity composed of the moving jaw and the fixed jaw. The hammer crusher is mainly broken by the impact, shear and tear of the rotating hammer head, the mutual impact between materials and the counterattack of the lining plate.
Hammer crusher is mainly used to crush ores with low hardness, and its compressive strength is generally lower than 200Mpa, such as limestone, bluestone, coal gangue, etc. When crushing hard materials, the hammer head is seriously worn and the cost of frequent replacement is high.
The adjustment of the discharging granularity of the hammer crusher is realized by changing the bottom sieve plate. There are three adjustment modes of jaw crusher: base plate adjustment, wedge adjustment and hydraulic cylinder.
Hammer Crusher is rarely used in aggregate production line. Although the process is simple, the yield is low, it is easy to be over crushed, and there are many powdery materials. Moreover, the finished aggregate may have microcracks, low compressive strength, which will affect the quality of aggregate, sales and price. Therefore, it is often used as auxiliary sand making machine.
The main advantage of hammer crusher is that the ore with low hardness can be formed in one time. For the production line with output < 300t/h, a single hammer crusher can replace a jaw crusehr + a impact crusehr.
The main advantages of jaw crusehr are simple structure, convenient maintenance, high wear resistance, high cost performance, suitable for all kinds of hard ores. However, due to the high content of needle and flake aggregates in the discharge, it is necessary to cooperate with impact crusher for shaping.