ProfileWith the approximate circle movement, the series of vibrating screen is a kind of multilayer, high-efficient and new-type vibrating screen. Considering that the screen has adopted the boxvibrate eccentric and tyre coupling, the screen can enhance the service life of equipment, meanwhile, the configured spring damping devices can effectively reduce the impact on the foundation, therefore, it has small vibration noise. As the configured device for all kinds of crusher machinery, the screen is mainly used for classifying the mine, coal, building materials, as well as other broken stones, quarrying and dinas. Due to the alternative multilayer screen cloth, it can satisfy the screening requirements of materials with different dimensions,Vibrator:The eccentric block is equipped on each side plate by means of transmission shaft connection. The vibrator is made up of self-aligning bearing and two shield covers. The eccentric block is mounted on the transmission shaft. By means of changing the angle between the main eccentric blocks and auxiliary eccentric block, it can change the size of the vibrator to get various amplitude.Straining box: the straining box is the biggest part in YK circular vibrating screen, which is mainly made up of feeder trough, relief trough, side plate, cross girder, screen surface, tension device and other devices. The side plate is made of massive steel plate. The cross girder adopts seamless steel tube. Each soldering lug and side plate are connected with high-strength bolt. The working of the YK circular vibrating screen is reliable. And, the manufacturing and maintaining is simple.Technical specificalModelRotation speedr/min)Number of screening surface layersSpecification of screen deckmmMax. Feeding quantitymmVibration frequencyr/min)TiltDoubleamplitude (mm)Processin ability t/hPhysical dimensionmmPowerkwWeight tYK 0045004009701 .529112076113.92YK 0045004009702 30503220154.42YK 048002007302 31473776154.93YK 048004009702 308626531564YK 048002009702 2947404618.57YK 0054002009802 3247275018.55.12YK 054004009702 34003911227.63YK 0540040097015 33263393228.74YK 054004007302 341742663010.5YK2 6000400730208 4035300518.55.92YK2 6000400730208 37354087307.83YK2 6000400730208 393445943010.74YK2 60004007402 396650734511.1YK2460730124006000200730208 40353005226.22YK2460730224006000200730208 403540873083YK2460740324006000200740208 423445943710.74YK2460740424006000200740208 426650734512.82YK2865730228006500200730208 4407461822211.43YK2865740328006500200730208 4407461822213YK3072740130007200200740208 46073365218.510.82YK3072730230007200200730208 4455437922211.83YK3072730330007200200730208 4467496422215.8YA 00480040014602 30233002157YZ1230150011200300020014902 2030.51622.214.171.124YZ1236150031200360020015002 2270.52776.3114.3Supporting device: The elastic component id made of rubber spring. By means of changing the height of back and front support, it can change the the leaning angle of screen. The changed height of support and the size of anchor bolt hole are decided by user.SketchStorageAfter the equipment arrives at the destination, the user must check whether if the components are complete in the light of the product list. In the meanwhile, the user must check whether if the product exists flaw and damage caused during the transportation and then record the damage and flaw on the bill of lading. The equipment must be put on flat and smooth ground. On the bottom of the screen, the sleeper must be underlaied for stable installation. When it is put on open yard, it can not touch the ground as well as it can not be soaked. When it is stored, the upper part should be covered for preventing it from erosion by wind and rain.InstallationThe installation of the screen must apply the requirement of general drawing on operational spot and the sequence of installation as following:First of all, it must make foundation leveling. Then, it must install the supporting frame and motor frame and adjust the relative position. After it is fastened, it can install the damping spring in proper order. Before the damping spring is installed, the spring shall be selected according to the actual value of the end marksInstall the screen : firstly, it should transport the screen to the installation site. Lift the screen and make the inclination of the screen conforming to the general drawing and then put it down slowly. The screen must be put on the surface of the damping spring. Install the electric motor and connect the line. The user must pay attention to the center height. If the screen is installed after it has been transported to the destination over a half year, all of the exciter should be dismounted. Then all of the exciter should be wash again and refuel again.Install the flexible coupling between the vibration exciter and electric motor. It is considered that the axis of the electric motor and axis of vibration must be coaxial. Running-in and acceptance inspectionThe installation should be checked in accordance with narrated instruction. The screen can be operated through test run with empty load.The time of test run will be no less than one hour with empty load. During the test run, the user should observe the screen continuously. The starting of the screen be smooth and quick. The vibration of the screen is stable without special noise. Operating specificationThe operator should be familiar with the equipment. And the operator must obey the stipulations on operation, maintenance, safety, sanitation and others in the plant.Preparation: before the operation of the equipment, the operator must read the duty record and monitoring the equipment. All bolts should be checked to assure whether if it is loose and whether if the screen is in abrasion.Starting: the starting of the screen must obey the sequence of process system one time.Structure featuresIt has advanced structure, strong excitation force and large vibration intensity.It has small initial vibration quantity.It can pass through resonance steadily.It has less screen clogging phenomenon.Due to the small noise, it can improve the working environment,It is easy to maintenance the study and durable property.FAQWhat characteristic do the YK circular vibrating screen include?The YK circular vibrating screen is convenient to install with simple structure. The max.grading layer can reach four.What type do the sieve plate adopt?It adopts general wearable mess grid made of manganese steel. Also it can adopt punching wearable steel plate which is depended on user.How many vibrator sets do the YK circular vibration have?The general specification adopts one set vibrator. The larger vibrator will adopt two sets in according to synchronous belt the same direction movement.
With the approximate circle movement, the series of vibrating screen is a kind of multilayer, high-efficient and new-type vibrating screen. Considering that the screen has adopted the boxvibrate eccentric and tyre coupling, the screen can enhance the service life of equipment, meanwhile, the configured spring damping devices can effectively reduce the impact on the foundation, therefore, it has small vibration noise. As the configured device for all kinds of crusher machinery, the screen is mainly used for classifying the mine, coal, building materials, as well as other broken stones, quarrying and dinas. Due to the alternative multilayer screen cloth, it can satisfy the screening requirements of materials with different dimensions,
The eccentric block is equipped on each side plate by means of transmission shaft connection. The vibrator is made up of self-aligning bearing and two shield covers. The eccentric block is mounted on the transmission shaft. By means of changing the angle between the main eccentric blocks and auxiliary eccentric block, it can change the size of the vibrator to get various amplitude.
Straining box: the straining box is the biggest part in YK circular vibrating screen, which is mainly made up of feeder trough, relief trough, side plate, cross girder, screen surface, tension device and other devices. The side plate is made of massive steel plate. The cross girder adopts seamless steel tube. Each soldering lug and side plate are connected with high-strength bolt. The working of the YK circular vibrating screen is reliable. And, the manufacturing and maintaining is simple.
Supporting device: The elastic component id made of rubber spring. By means of changing the height of back and front support, it can change the the leaning angle of screen. The changed height of support and the size of anchor bolt hole are decided by user.
After the equipment arrives at the destination, the user must check whether if the components are complete in the light of the product list. In the meanwhile, the user must check whether if the product exists flaw and damage caused during the transportation and then record the damage and flaw on the bill of lading. The equipment must be put on flat and smooth ground. On the bottom of the screen, the sleeper must be underlaied for stable installation. When it is put on open yard, it can not touch the ground as well as it can not be soaked. When it is stored, the upper part should be covered for preventing it from erosion by wind and rain.
First of all, it must make foundation leveling. Then, it must install the supporting frame and motor frame and adjust the relative position. After it is fastened, it can install the damping spring in proper order. Before the damping spring is installed, the spring shall be selected according to the actual value of the end marks
Install the screen : firstly, it should transport the screen to the installation site. Lift the screen and make the inclination of the screen conforming to the general drawing and then put it down slowly. The screen must be put on the surface of the damping spring.
Install the electric motor and connect the line. The user must pay attention to the center height. If the screen is installed after it has been transported to the destination over a half year, all of the exciter should be dismounted. Then all of the exciter should be wash again and refuel again.
The time of test run will be no less than one hour with empty load. During the test run, the user should observe the screen continuously. The starting of the screen be smooth and quick. The vibration of the screen is stable without special noise.
Preparation: before the operation of the equipment, the operator must read the duty record and monitoring the equipment. All bolts should be checked to assure whether if it is loose and whether if the screen is in abrasion.
After the circular vibrating screen production was completed,and there is an important step before delivery goods,thats test running,and judge the equipment whether can work normally through equipment running condition,please see following test items: 1.Measuring rotary speed of principal shaft The test principle is through infrared sensor scanning a fixed point on the shaft to confirm the rotary speed.Firstly,pasting the measured speed tags on rotor surface.then running the equipment,after the normal runninglet the tachometer probe aims at one point on the tag movement locus,record the data,and it requires multiple measurements to take average. 2.Noise test of equipment running. A good equipment should work without abnormal sound,after the equipment running normally,place the noise meter probe near the running parts of vibrating screen,record the data, it requires multiple measurements to take average.
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Screening is an indispensable link in the sand and gravel aggregate production line. Screening is used to separate materials with different properties. The screening equipment uses rotation, vibration, reciprocation, shaking and other actions to divide the materials through the screen into several grades according to the size of the material to ensure that the sand and gravel materials meet the crushing requirements of the crushing equipment.Screening machines are classified into circular vibrating screens, linear vibrating screens, roller screens, cylindrical screens, etc. according to their structure and movement characteristics. Different screens have their own advantages and scope of application. The more commonly used types of mine production are circular vibrating screen and linear vibrating screen. This article introduces the 7 differences between linear vibrating screen and circular vibrating screen.
The circular vibrating screen uses the centrifugal force generated by the rotation of the eccentric mass in the vibrator to force the screen box, vibrator and other parts to make a forced continuous circular or approximate circular motion. The materials follow the screen box for continuous throwing motion on the inclined screen surface, layering when throwing, and particles passing through the screen when falling.
The circular vibrating screen has the characteristics of reliable structure, high screening efficiency, strong excitation force, sturdiness and durability, convenient maintenance, and safe use. It is widely used in mining, building materials, transportation, energy, chemical and other industries.
2. Vibration exciterThe linear vibrating screen exciter is composed of two shafts and works by the principle of vibration motor excitation, so it is also called a double shaft vibrating screen.The circular vibrating screen is also called a single-shaft vibrating screen because the exciter is a shaft and uses an inertial motor to work.
3. Screen hole blockingThe material of the linear vibrating screen moves smoothly on the screen surface. If the feed is uneven or the material has a high humidity and viscosity, it is easy to block holes.The material of the circular vibrating screen moves in a parabolic circular trajectory on the screen surface, so that the material is dispersed as much as possible, thereby improving the materials bounce and reducing the phenomenon of hole blocking.
4. Installation angleGenerally speaking, the inclination angle of the screen surface of the linear vibrating screen is small, and the height of the screen is reduced, which is convenient for layout.The circular vibrating screen usually has an installation inclination angle of 15-20 degrees, so as to change the moving speed of the material along the screen surface and improve the screening efficiency.
5. MaterialThe linear vibration screening materials are mainly light plates or stainless steel plates.The circular vibration screening material is thick, and the box body is made of manganese steel, which can resist the impact of the material during the screening process.
6. Shape structureThe linear vibrating screen can adopt a fully enclosed structure without dust spillage, which is more conducive to environmental protection.The vibration exciter of the circular vibrating screen is arranged above the center of gravity of the screen box, which is conducive to the rapid dispersion of materials, and the processing capacity per unit time is higher than that of the linear vibrating screen.
7. Applicable fieldsLinear screens mainly screen fine particles, light specific gravity, and low-hardness materials, mainly dry powder, fine granular or micro-powder materials, and are generally used in food, chemical, building materials, and pharmaceutical industries.
The circular vibrating screen mainly screens materials with high specific gravity, large particles and high hardness. It is widely used in mining industries such as mines, coal, and quarries. In addition, some difficult-to-screen materials can also use circular vibrating screens.
The ideal motion characteristics for the vibrating screen was presented according to the principle of screening process with constant bed thickness. A new vibrating screen with variable elliptical trace was proposed. An accurate mechanical model was constructed according to the required structural motion features. Applying multi-degree-of-freedom vibration theory, characteristics of the vibrating screen was analyzed. Kinematics parameters of the vibrating screen which motion traces were linear, circular or elliptical were obtained. The stable solutions of the dynamic equations gave the motions of the vibrating screen by means of computer simulations. Technological parameters, including amplitude, movement velocity and throwing index, of five specific points along the screen surface were gained by theoretical calculation. The results show that the traces of the new designed vibrating screen follow the ideal screening motion. The screening efficiency and processing capacity may thus be effectively improved.
Thanks to the simple adjustment of counterweights on the motor axis and to the three-dimensional vibration they generate, our circular vibrating screens allow to sieve, classify, dedust and filter a very wide range of products, achieving good results even with fine products. The vibrating motion of the screen runs both horizontally and vertically and can be adjusted in both directions. A distinguishing feature of our vibrating screen is the possibility to easily alter the vibrating movement and, as a consequence, the behaviour of the material to be sieved. By installing an inverter, besides, you can also change the vibration speed. This provides great flexibility of use, with both solid and liquid products. The ERIMAKI vibrating screens require no special installation structures, as the upper section transmits no vibration to the base, which as a consequence may even be equipped with wheels. Thanks to the simplicity of their design, besides, the vibrating screens can also be disassembled very quickly for cleaning or mesh replacement. On each vibrating screen you can install 1 to 4 separation stages, thus getting from 2 to 5 product fractions. The screen may be made of carbon steel or stainless steel, and equipped with different optional accessories.
In the drilling industry, a vibrating screen called shale shaker is the first equipment that does the filtration process. The purpose here is minimizing cutting solids in the mud. A shale shaker is the first line of defense in minimizing the cuttings content because it separates the largest solids first. The screens consist of different layers of mesh and are vibrated in order to increase the filtration efficiency.
A shale shaker should employ all screen areas to remove solids from drilling fluid and minimize the drilling fluid loss. The screen vibration pushes the particles uphill over the screen and mud is collected at the underside of the screen. There is a limitation in shale shakers operations in which filtration performance alters as the feed properties change. Typical vibrating screens vibrate with a constant speed and constant motors forces which results in acceleration on the screen. In handling the huge volume of drilling mud, the acceleration usually decreases as mudflows into the screen. Shakers operating in the oil industry have higher acceleration than the required magnitude to be able to have enough acceleration when heavily loaded.
In the new technologies developed for shale shakers, constant-g technology is becoming a popular technique. This technique measures the screen acceleration and sends the signals to a variable frequency drive to keep constant acceleration even under varying loads.
Drilling liquid is returned to the well surface and then flows on the shale shaker screens. After the drilling mud was processed by the shaker, it flows to the mud tanks where other solid-liquid separation equipments separate the finer particles from mud. The separated particles are sent to a holding tank where they further will be disposed of.
Two types of end-feed and center-feed shale shakers are used in the drilling industry which the end-feed shaker is the most common one. The screen of an end feed shaker is rectangular while center feed screens are circular. Because drilling fluid flow pattern is the difference for both screens, so the vibration pattern for end-feed and center feed shale shakers is not identical. The screen motion dominates particle velocity on the screen and drilling flow rate though cake and screen.
In an end feed shale shaker, the motion of the imaginary line created by the intersection of vertical plane parallel with the walls and screen cloth is elliptical. All points on the line perpendicular to the vertical plane parallel with the walls and passing through the screens have identical motion. In a direction perpendicular to the vertical plane parallel with the walls, motion is zero. This type of vibration results in the motion of particles across the screen in a straight path to the mud pits.
In the radial distance from the center of the circular feed shaker, the motion of all points on the screen is elliptical. All points vibrate in a vertical plane perpendicular to the radial plane. In this kind of shaker, particles also move in a circular shape in a horizontal plane perpendicular to the radial plane and the screen experiences a 3-D motion. In the elliptical motion screens, motion is identical in all angular location around the center.
Hoberock proposed that the linear vibration than the circular motion model results in higher efficiency in solids conveyance. He also showed that even elliptical vibration shows higher efficiency compared to the linear motion as a result of that screen life is increased.
For the multi-deck shale shakers, it is recommended that the coarsest mesh size is placed at the top, then the finer mesh size is used as the middle screen and finally, the finest mesh should be placed as the bottom screen. This configuration allows the shaker to collect the finer particles with the highest efficiency. The problem of multi-deck shakers is in maintaining the bottom screen.
It has been shown that the performance of a shale shaker depends on the large number of parameters. The most important variables affecting the capacity of a shale shaker are fluid rheological properties, concentration and size distribution of solids, screen mesh and area, vibration frequency, vibration pattern, acceleration, and deck angle.
The maximizing capacity of a shale shaker is a trade-off between the content of separated cuttings off the screen and filtrated drilling mud passed through the screen. For example, if the shaker deck is inclined downward to enhance particles transfer more drilling mud flows off the shaker channel, and cuttings at the outlet have more moisture while tilting the screen up decreases solids velocity but more fluid is saved. There is an optimum angle for each shaker, depend on the manufacturer, which tilting the screen up. more than that causes solids accumulation on the screen and blocking the screen pores. The physical mechanisms justifying the effect of vibration on the fluid displacement in porous media are not yet known.
It is suggested that an increase in flow rate is caused by changes in the pore structure and particle rearrangement. A research was conducted on the effect of vibration on the flow rate of Hexadecane as a non-wetting phase in a column filled with water and sand, the Hexadecane flow rate increased by increasing amplitude. Another explanation for the effect of vibration on the flow rate is based on the capillary trapping. The capillary trapping mechanism is the most promising one. The idea for this mechanism is based on the interfacial tension which is considered as the most significant parameter on multi-phase flow in porous media.
Changing in pore sizes of porous media trap the fluid which leads to variations in capillary pressures. This pressure imbalance changes the flow rate of liquid through the porous media. By applying vibration, we see that vibration of the screen will result in an inertial body force acting on the fluid which this movement pushes the trapped fluid to reflow. Vibration creates an internal circulation in the mud and it gives more time to the fluid to touch the screen and this might be one of the effects of vibration on the enhancement of the flow rate.
Particle size distribution and concentration both have an effect on the process of solids-liquid separation. Increasing the solids concentration in drilling mud reduces the performance of the drilling operations. Experimental work shows that muds containing more than 10% by mass solids caused the failure infiltration process. Microbit drilling results indicated that very fine particles in a drilling mud have more adverse effects on the flow rate than larger sizes.
It is claimed that particles smaller than 1 are much more damaging to the filtration process than particles larger than 1. All solid-liquid separation tools in the drilling industry are designed to remove particles larger than 1. The shale shaker changes the formation of particle structure in the drilling mud due to vibration. Shear stress of the drilling fluid is decreased due to vibration while polymeric drilling fluid is not affected by imposing vibration.
Research on the effect of plastic viscosity and yield values shows that plastic viscosity of drilling mud flowing through the screen and cake has a significant effect on the capacity of a shale shaker while yield value has a slight effect on the performance. It has been also shown that increasing the plastic viscosity and yield value of a drilling fluid increases the required screen area used in a shaker. The capacity of a shale shaker can be increased by decreasing plastic viscosity and increasing screen area, shaker angle, and acceleration.
The install location of the vibrating motors on the shale shakers can be considered as one of the parameters involving in the design of shale shakers. Some manufacturers say that if a vibrator is precisely mounted on the shaker support there is no need to incline the shaker downward to get desired mass rate of solids on the screen but one should aware that inclining the screen downward decreases the drilling mud flow rate and increases the moisture content of the particles leaving out the channel of the shaker.
In an experimental work done by Porter on a vibrating electromagnetic screen, the capacity improved by increasing frequency and decreased by amplitude. Their results showed that there is optimum operational conditions which after passing the optimal point, flow rate decreased. Angle 33 was found as the most effective angle.
It has been shown that frequency is one of the important parameters affecting screen performance while other researches showed the reverse results. The interaction between frequency and particle size shows that for a feed whose particle size is close to the opening, frequency is the most effective parameter. Two experimental works claimed that screening efficiency decreased as frequency increased.
A study showed that an increase in deck angle increased the effective mesh area and number of contacts per unit screen length. An increase in the deck angle enhanced the passage of particles. It was found that angles more than 15 decreased the effectiveness.
A work by Hoberock on an experimental shaker working in acceleration 4g and two frequencies 20 and 60 Hz showed that frequency has an insignificant effect on the fluid capacity of the shaker. His work showed that flow rate at 60Hz is slightly less than that in 20Hz. Their results on a 100*100 mesh screen with three types of drilling fluids showed that the capacity of a shale shaker depend heavily upon the acceleration.
A screen whose conductance is higher than the similar screens shows higher performance. The proposed mechanism for this improvement is in considering permeability and screen thickness than solely the pore area percentage.
A work by Dorry shows that capacity of a shale shaker increases by increasing g-force. His work revealed that the rate of increase in capacity of the shale shaker reached a minimum plateau. It indicates that there is a threshold g-force which after passing that point increasing acceleration does not have any effect on the performance of the shaker.
Usually, a shale shaker works with two motors that apply the vibratory motion on the shaker screen. There are two eccentric weights in the motors to generate a vibrating force when they rotate. The vibrators rotate in opposite directions and create a force on the screen. The force pushes the particles along with the screen and off the screen outlet. The motors can be installed on the vibrating deck or on the support frame.
The shaker screen plane should be capable of tilting to handle fluctuations in mud flow rates and maximize the use of the screen area. Depend on the type of the shale and drilling process, different angling systems are used which mechanical, hydraulic, and pneumatic mechanisms are the most common. It is reported that mechanical and hydraulic systems are faster than pneumatic mechanism and need less energy to function.
This part is the most important part of the shale shaker which most of the efforts in improving the performance of a vibrating shale shaker concentrate on this part. The screen removes drilled cuttings and sends them to the base and make the filtration process more convenient.
This part collects the drilling mud before it flows into the shaker channel. Different types of feeders are used in the drilling industry which the most common one is called weir feeder. This feeder is capable of distributing the drilling mud along the entire shaker screen surface. The feeder has a bypass streamline that sends the mud directly to the collecting tank without being processed by the screen.
A tank is used when the shaker is being repaired or screens are being changed. In the situations that drilling mud is too thick to pass through the screen, the screen is blinded or plugged which in this situation tank is used. A feed tank has a bypass port which allows the drilling mud goes to the mud circulation system.
Different types of shaker screens with different methods of characterizations of the screen cloth are used in the filtration industry. In the drilling industry, the plain square mesh is the most common one. The number of wires per inch is called mesh. A higher mesh number means finer particles can pass through it. For preventing problems such as plugging in the square screens, rectangular mesh screens are usually used. These screens enhance the ratio of the opening area. Layered screens are known as the best option for preventing plugging. Tilting the screen changes flow capacity, conveyance and cuttings moisture. Drilling fluid is lost due to the failure in the borehole and conveyance reduces due to the particle plugging close to the outlet of the shaker.
The layered shale shaker screens are non-plugging and easily changed. API set some instructions for the shale shakers screens mesh. APR recommends that numbering a mesh in both directions should be followed in parentheses by opening size in microns and the percentage of open area. For example, a screen with a specification of 85 *85 (642 *642, 49) means a square screen with 85 openings per inch in each direction which has an opening size of 642 and an open area of 49%. Screen with the specification of 14090 (211585, 56) means a rectangular mesh screen with 140 openings in one direction and 90 openings in another direction. Openings in 140 mesh direction are 211 micron and in 90 mesh direction has the size of 585 microns.
Some screen manufactures recommend that calculated length of required screen should be increased by one-third to consider for the drainage zone for wet filter cake. Screens with mesh number 40*80 are the most common screens in the drilling industry.
Recently, a new technology called pyramid screen has been introduced in the screen industry. In this technique, the maximum area of a shale shaker screen can be achieved. Pyramid screens have a flat bottom and corrugation shape on top. The shaker screens maximize the performance of the screen using building up without the requirement of having a larger screen which results in less expensive shale shakers.
Industrial reports show that a constant-g control shale shaker is capable of filtration of finer solids than the typical shale shakers. The efficiency of solids removal is improved with a constant-g control shale shaker.
Vibration acceleration of a shale shaker is calculated by Newtons second law of motion. As the drilling fluid flows onto the screen, the system mass increases which results in decreasing the acceleration. A shale shaker vibrates at a constant frequency which generates a constant force. When the flow rate decreases, the acceleration increases and it causes higher surface area which results in screen failure.
The performance of a shale shaker depends on the vibration intensity and shaker structure. The vibration has effect on the agglomeration of particle. Different techniques such as high temperature, solvent extraction, and soap washing have been proposed to separate oil from cuttings. These techniques have limitations such as safety issues and high energy consuming.
Very few experimental studies have been done on the filtration of drilling mud using shale shakers. Cagle et.al compared two shale shakers experimentally to investigate the screen cloth effect on the filtration process. Hoberock developed a model on a full-scale shale shaker to predict the fluid handling capacity of the vibrating screens. It is shown that a shale shaker efficiency in treating mud is a function of vibration frequency and acceleration, shaker angle, fluid rheological properties, type andamount of drilled solids, mud height, and type of screen and mesh size.
In a new design in the drilling industry, a vacuum conveyor separator (VCS) system was innovated to improve the efficiency of removal of solids from drilling mud. In this system, blinding does not happen and there is no need to install respiratory systems. VCS systems are able to monitor fluid and solids volume simultaneously and record and transmit fluid data. In these kinds of solids separation equipment, there is no need to install degasser, pressure washers, and solids dryer so operation cost becomes minimum.
One of the concerns with using fine mesh screens in viscous mud systems is that screen life and flow capacity decrease and the plugging screen is observed repeatedly. The typical layered screens are composed of two fine mesh layers supported by a coarse screen.
A field report shows that mud viscosity has a significant effect on the performance of the screen. Increasing viscosity decreases capacity of a screen exponentially. The results show that the capacity of a screen in handling drilling mud is not linear function of the covered surface of the screen.
One of the most common physical separation techniques in drilling industry is the mechanical screening. Separating tools are classified into moving and static screen equipment in which the machine can be inclined or horizontal.
The process of screening is controlled by physical variables such as particle shapes, acceleration, vibration type and bed density. The vibration motion and screen mesh size have their pros and cons in the process of screening. The most effective pattern of vibration is sinusoidal vibration which is applied on the angled screen relative to the horizontal.
The actual flow rate of a shale shaker infiltration of drilling mud is less than the capacity of a shaker which processes only fluid. Because of the presence of the solids in drilling mud, the capacity of a shale shaker may be reduced due to one of the following effects:
The five types of mechanical vibration are used in solids separation industry: Circular motion shakers in which motion at the low angels gives the best performance. This vibrator works by an eccentric drive or mass offsets that cause the shaker to vibrate in the orbital pattern. The solids move across the screen and leave out the screen due to gravity and directional shifts. The shaker is inclined between 2 to 5 degrees and is used for clean cuttings.
Circle-throw machine is another type of vibrator in which an eccentric shaft shakes the screen at a given angle. As the vibrator returns to the steady-state, the cuttings drop down by gravity to the collector. This equipment is usually used in the mining industry for solids size which varies from 5 to 20 in. This shaker is employed for large solids and a high volume rate at the outlet.
The solids capable of passing through the screen cloth return back to a crusher and then is mixed with crushed solids. The most common application of this shaker is in the washing process. The results of vibrating screens used in the mining industry cannot be generalized for the shale shakers in the drilling field because the main material in which shale shaker process is fluid rather than solids.
High-frequency vibrators vibrate only the screen and are usually used for particle sizes smaller than 20 mm. These vibrators fulfill a secondary filtration for more separation process and their angles vary from 3 to 12.
Tumbler screen is another separator in which elliptical motion does the filtration process. In these screens, the fine material blinds the screen center, and larger particles move to the collector. Particles on the screen are broke down and leave the screen cloth. For improving the separation efficiency of a tumbler screen, adding more decks is recommended.
In the G-Control technique, the screen acceleration is measured and then a signal is sent to a variable frequency drive to keep constant g-force. As drilling fluid enters the shaker screen, vibration frequency decreases. The current shale shakers in the industry have high acceleration than required one to handle the situations the screen is heavily loaded. In recent developments in the shaker industry, a new technology called G-Control came to the market to overcome the problem of decreasing acceleration of the shaker screens due to being loaded. By applying Newtons second law of motion, we can easily see that acceleration is inversely proportional to the drilling mud mass. The shakers in the fieldwork at a constant frequency which results in decreasing acceleration as the mass of mud increases Industrial reports claim that these types of shakers can remove finer solids than the typical shakers used in the fields.
Whenshale shakerscease to operate as expected, a variety of items need to be checked and the problem eliminated. This section presents a general guideline for troubleshooting some common problems observed in shaker operations.
 Conventional shale shakers usually produce a g factor of less than 3; fine-screen shale shakers usually provide a g factor of between 4 and 6. Some shale shakers can provide as much as 8 gs. Greater solids separation is possible with higher g factors, but they also generally shorten screen life. As noted previously (in the Linear Motion Shale Shakers subsection), only a portion of the energy transports the cuttings in the proper direction in unbalanced elliptical and circular vibration motion designs. The remainder of the energy is lost due to the peculiar shape of the screen bed orbit, as manifested by solids becoming nondirectional or traveling in the wrong direction on the screen surface. Linear motion and balanced elliptical designs provide positive conveyance of solids throughout the vibratory cycle because the motion is straight-line rather than elliptical or circular. Generally, the acceleration forces perpendicular to the screen surface are responsible for the liquid and solids passing through the screen, or the liquid capacity. The acceleration forces parallel to the screen surface are responsible for the solids transport, or the solids capacity. 
 Shale Shaker Systems construct the whole system in order to purify the fluid. So when we chose a good shale shaker, we need to know the parts of it at the beginning. Next we will give you a general understanding of it. 
Derrick and PYRAMID is a registered trademark of Derrick Corporation, Buffalo, New York. FLC500, FLC2000, PMD, PWP, Dual Pool, Hyper Pool series shale shaker and related shale shaker screen are the production of derrick corporation. There is no affiliation between Derrick Corporation and SolidsControlshaker.com.
The overflow concentration of the classifier refers to the ratio of ore (solid) to water in the overflow, which can be directly measured. The size of the overflow concentration directly reflects the fineness of the ore in the overflow (that is, the fineness of the selected materials). If the overflow concentration is small, it means that the material grinding spoon is relatively thick and the fineness is not enough; if the overflow concentration is large, it means the product has better fineness and the grinding spoon is finer. Since the more important concentration refers to the ratio of solids to water, the smaller the concentration, the less solid content. Therefore, the concentration affects the throughput. In the field production, it is generally strictly regulated to control the overflow concentration to indirectly control the fineness of the overflow product.
According to the different principles of the vibration exciter, it can be divided into eccentric vibrating screen (also called semi-vibrating screen), inertial vibrating screen and electric vibrating screen. At present, eccentric vibrating screens are rarely used, and electromagnetic vibrating screens are mainly used for the classification of powdery fine-grained materials. Resonant screens once rose and developed rapidly. However, in production practice, shortcomings such as complex structure, difficult adjustment, and many failures have been exposed. In screening operations, inertial vibrating screens are widely used, generally referred to as vibrating screens for short.
At present, the vibrating screen is divided into circular motion vibrating screen (referred to as circular vibrating screen) and linear motion vibrating screen (referred to as linear vibrating screen) according to the characteristics of the movement track of the screen surface.
The circular vibrating screen can be divided into a limited center circular vibrating screen, an uncentered circular vibrating screen and a self-centered circular vibrating screen according to the spatial position of the belt wheel on the exciter shaft when it is working.
(1) The vibrating screen operator should read the duty record and conduct a general inspection of the equipment before working. Check the tension of the V-belt, the oil level in the vibrator, check the tension of the screen surface, the tightening of the bolts of each part and the damage of the screen surface.
(3) When the sieve is in operation, the working conditions of the exciter and the sieve box should be inspected visually and audibly. After parking, touch the vicinity of the bearing cover with your hands to check the temperature rise of the bearing.
(4) The shutdown of the vibrating screen should conform to the sequence of the process system. Except for special requirements, it is strictly forbidden to continue feeding to the sieve after stopping with material.
(5) The technical status of the screens on the shift and the faults found should be recorded in the shift record when the shift is transferred. The damage category of the parts and the date of refilling and changing the oil of the exciter should be indicated in the record.
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YK series circular vibrating screen is composition mainly by the screen box, screen mesh, vibrator and damping spring, etc. Vibrator is installed in the side panels of screen box, which driven by motor through the coupling, produce centrifugal inertia force, making the screen box vibration.
YK series circular vibrating screen is the seat installation, the screen surface angle can be adjusted by changing the height of the spring bearing to achieve. The screen plate have perforated sieve plate and rubber sieve plate, there have single layer and double layer, all kinds of sieve plate can meet the requirements of high screening efficiency, long life and non-blocking. The motor can be flexibly chosen to be mounted on the left or right of the screen box.
Fine screening machines are less frequently used in the production of crushing mills, so the comparison here focuses on linear and circular screens. In practice, circular and linear vibrating screens are not fundamentally different in pattern and structural composition. The material is screened by the vibration of the screen surface for the purpose of screening, but the difference in the vibration trajectory will directly affect the purpose of screening.
The electric motor is driven by a v-belt, which causes the eccentric wheel of the exciter to rotate at high speed and generate a large centrifugal inertia force, which excites the circular vibrating screen to produce a circular motion of a certain amplitude. The material on the screen is subjected to a continuous throwing motion by impulses transmitted from the screen box on the inclined screen surface and sieves particles smaller than the screen holes as they encounter the screen surface, thus achieving classification.
A vibrating motor is used as the source of vibration, causing the material to be thrown on the screen as it moves in a straight line. The material enters the linear vibrating screen evenly through the inlet and is passed through the multilayer screen producing several different sizes of oversize and undersize products which are discharged through their respective outlets.
In the field of sand crushing or sand washing, circular vibrating screens have a large number of applications. In practice, the use of circular or linear vibrating screens depends mainly on the type of material and the application are handled by the user. The choice of equipment differs according to the purpose of the screening.
The circular vibrating screen is mainly used for classifying materials with high specific weight, large particles, and high hardness. It is widely used in the mining industry, for example in mines, coal, and quarries.
Linear screens are mainly used for fine-grained, light, and low-hardness materials and consist mainly of dry, fine-grained, or finely powdered materials. They are widely used in the food, chemical, building materials, and pharmaceutical industries.
In the case of circular vibrating screens, the material is quickly dispersed because the exciter is arranged above the center of gravity of the screen box and the upper end of the long elliptical axis at the feed end faces the discharge direction. The upper end of the elliptical long axis at the discharge end is opposite to the discharge direction, which reduces the movement speed of the material and facilitates the screening of difficult-to-screen materials. The surface of the curved sieve increases the effective area of the sieve machine, thus increasing its handling capacity.
In addition, for difficult-to-screen materials, the circular vibrating screen can make the spindle reversed, so that the vibration direction is opposite to the direction of movement of the material, and the movement speed of the material along the screen surface is reduced. Improve the screening efficiency.
In the field of sand crushing or sand washing, circular vibrating screens have a large number of applications. In practice, the use of circular or linear vibrating screens depends mainly on the type of material and the application are handled by the user. The choice of equipment differs according to the purpose of the screening.