Vibrating screen
Definition of scientific term
Chinese name: vibrating screen
English name: vibrating screen
Definition 1: rely on mechanical vibrations, of coal sieved device. Applied disciplines: electricity (a subject); fuel (two subjects)
Definition 2: A screening machine that vibrates the screen box mechanically or electromagnetically.
Applied science: coal science and technology (a subject); mining machinery engineering (two subjects); coal preparation machinery (three subjects) The above content was approved by the National Science and Technology Terminology Committee
The vibrating screen works by the complex-rotating vibration generated by the vibrator excitation. The upper rotating weight of the vibrator causes the plane to produce a plane gyration vibration, while the lower rotating weight causes the screen surface to produce a cone-shaped rotating vibration, and the combined effect causes the screen surface to produce a compound-rotating vibration. Its vibration trajectory is a complex space curve. The curve is projected as a circle on the horizontal plane and an ellipse on the vertical plane. Adjust the excitation force of the upper and lower rotary weights to change the amplitude. Adjusting the spatial phase angle of the upper and lower weights can change the curve shape of the screen movement trajectory and change the movement trajectory of the material on the screen surface.
species
The main types of vibrating screens:
The vibrating screen is mainly divided into linear vibrating screen, high frequency vibrating screen, circular vibrating screen, vibrating screen, vibrating vibrating screen, ternary vibrating screen, variable frequency vibrating screen, probabilistic linear vibrating screen, curved vibrating screen and elastic arm. Vibrating screen, etc.
classification
Vibrating screening equipment can be divided into: vibrating screen for mining, light fine vibrating screen, experimental vibrating screen
Mine vibrating screen can be divided into: high-efficiency heavy-duty sieve, self-centering vibrating screen, elliptical vibrating screen, dewatering screen, circular vibrating screen, banana sieve, linear vibrating screen, etc.
Light and fine vibrating screen can be divided into: vibrating screen, linear screen, straight screen, ultrasonic vibrating screen, filter screen, etc.
Experimental vibrating screen: slap screen, top impact vibrating screen, standard inspection screen, electric vibrating screen, etc. Please refer to experimental equipment
Of course, this classification is not the most scientific. It is also suggested to classify the material according to the trajectory of the vibrating screen. I will simply do this for reference only:
According to the linear motion track: linear vibrating screen (material moves linearly forward on the screen surface)
According to the circular motion track: circular vibrating screen (materials make circular motion on the screen surface) structure and advantages:
product description
The vibrating screen is a vibrating screening machine suitable for dry screening of wet fine-grained hard-to-screen materials. It is a vibrating screening machine for domestic processing of difficult-to-screen materials. The vibrating screen has the characteristics of large amplitude, large vibration intensity, low frequency and elastic screen surface. The maximum opening ratio is always maintained during the working process, so that the screening efficiency is high, the processing capacity is large, the sieve plate is replaced easily, and the cost is reduced. The vibrating screen has a large screen surface and large processing capacity to meet the production needs of the site. The structure of the vibrating screen sieve adopts a multi-stage screen surface vibration, and the screen box and the frame do not participate in the vibration movement mode, so that the sieve is enlarged.
Mechanical classification
The vibrating screen is mainly divided into a linear vibrating screen, a circular vibrating screen, and a high frequency vibrating screen. Vibrating screen can be vibrated according to the type of vibrator
Divided into a single-axis vibrating screen and a two-axis vibrating screen. The single-axis vibrating screen uses a single unbalanced heavy excitation to vibrate the screen box, and the screen surface is inclined. The moving track of the screen box is generally circular or elliptical. The two-axis vibrating screen is a double unbalanced heavy excitation that utilizes synchronous counter-rotating, the screen surface is horizontally or gently inclined, and the movement path of the screen box is a straight line. The vibrating screen has an inertial vibrating screen, an eccentric vibrating screen, a self-centering vibrating screen, and an electromagnetic vibrating screen.
Linear vibrating screen
When the vibrating screen is working, the two motors are synchronously placed in opposite directions to cause the exciter to generate a reverse exciting force, forcing the screen body to move the screen longitudinally, so that the material on the surface is excited and periodically throws a range. Thereby completing the material screening operation. Linear vibrating screen (straight screen) has the advantages of stable and reliable, low consumption, low noise, long life, stable vibration shape and high screening efficiency. It is a new and efficient screening equipment widely used in mining, coal, smelting and building materials. , refractory materials, light industry, chemical industry and other industries.
Circular vibrating screen
Circular vibrating screen
The circular vibrating screen (round vibrating screen) is a circular motion, which is a multi-layer, high-efficiency new vibrating screen. The circular vibrating screen adopts the cylindrical eccentric shaft exciter and the partial block to adjust the amplitude, the material sieve line length and the screening specifications are many, the structure is reliable, the excitation force is strong, the screening efficiency is high, the vibration noise is small, the sturdy and durable, the maintenance Convenient, safe to use, circular vibrating screen is widely used in the classification of products in mining, building materials, transportation, energy, chemical and other industries. The circular vibrating screen mainly comprises a sieve box, a screen mesh, a vibrator, a vibration-damping spring device and a chassis. The vibrator is on the side plate of the screen box, and the motor is rotated by the coupling or the belt to generate centrifugal inertial force, forcing the screen box to vibrate. The screen is the main consumable part. According to user requirements and product material, high-manganese steel braided mesh can be employed, and rubber perforated screen sieve, sieve single layer and dual-layer, can meet the different requirements of various types of screening sieve effect. This series of circular vibrating screens is mounted in a seat. The adjustment of the screen inclination can be achieved by changing the height of the spring support.
High frequency vibrating screen
The high-frequency vibrating screen is referred to as a high-frequency screen, and the high-frequency vibrating screen (high-frequency screen) is composed of a vibration exciter, a slurry distributor, a screen frame, a frame, a suspension spring, and a screen.
The high frequency vibrating screen (high frequency screen) has high efficiency, small amplitude and high screening frequency. The principle of high-frequency vibrating screen is different from that of ordinary screening equipment. Due to the high frequency of high-frequency vibrating screen (high-frequency screen), on the one hand, the tension on the surface of the slurry and the high-speed oscillation of the fine-grained material on the screen surface are destroyed, which accelerates. The large density of useful minerals and separation increases the probability of contact with the mesh of the separated particles.
Stone drum screen
The drum screen is made up of five parts: hexagonal drum, frame, funnel, reducer and motor. After the broken stone enters the drum, it is screened as the drum rotates, and the material is screened by the centrifugal force of the drum rotation and the jigging action. On the one hand, the coarse-grained stone flows forward along the slope of the drum, and is gradually screened out through the screen of different meshes. The small stones are sieved out and dropped into their respective funnels, which are then manually transported or self-flowed to the finished pile. The utility model has the advantages of simple and reliable structure, stable operation, good sealing, no pollution, low noise, quick network change, fine classification, large sorting ratio, high output, accurate sorting, low failure rate and convenient maintenance, and is particularly suitable for sand. Grading use of stone yards. The drum screen is fine workmanship, sturdy and durable, the steel frame is welded by profile steel, the funnel volume is large, and the steel plate is connected. There are five funnels for separate discharge. The funnel mouth is flanged and can be fed to both sides or one side, which is convenient for pulling or self-flowing, which improves the output, prevents the material from being worn and the screen is worn out, and delays production.
related information
Vibrating screen advantages
Mainly composed of screen box, vibration exciter, suspension (or support) device and motor.
The machine passes the V-belt to drive the spindle of the exciter to rotate. The sieve box is vibrated due to the centrifugal inertial force of the unbalanced weight on the exciter. Changing the exciter's eccentricity gives different amplitudes.
The main advantages of the vibrating screen:
1. Due to the strong vibration of the screen box, the phenomenon that the material blocks the sieve hole is reduced, so that the sieve has high screening efficiency and productivity.
2. The structure is simple and the screen surface is convenient to be removed.
3. Screening for less energy per ton of material.
Mechanical structure
The vibrating screen generally consists of a vibrator, a screen box, a support or suspension device, a transmission device and the like.
Vibrators for single-axis vibrating screens and vibrators for two-axis vibrating screens are generally classified into two types according to eccentricity reconfiguration. The eccentricity configuration is better in the block eccentric type.
The screen box is composed of a screen frame, a screen surface and a pressing device. The screen frame is made up of side panels and beams. The screen frame must be rigid enough. Support device
The support device of the vibrating screen has two types: a hanging type and a seat type. The seat type installation is relatively simple and the installation height is low, and it is generally preferred. The support device of the vibrating screen is mainly composed of elastic members, and coil springs, leaf springs and rubber springs are commonly used.
Transmission The vibrating screen usually adopts a V-belt transmission. The structure of the vibrating screen is simple, and the number of revolutions of the vibrator can be arbitrarily selected. However, the belt is easy to slip during operation, which may cause the screen hole to be blocked. The vibrating screen is also directly driven by a coupling. The coupling can maintain the stable number of revolutions of the vibrator, and the service life is long, but the number of revolutions of the vibrator is difficult to adjust.
working principle
When the vibrating screen is working, the synchronous rotation of the two motors causes the exciter to generate a reverse exciting force, forcing the screen body to move the screen for longitudinal movement, so that the material on the material is excited and periodically throws a range. Thereby completing the material screening operation. Suitable for quarrying sand and gravel materials, it can also be used for product classification in coal preparation, mineral processing , building materials, electric power and chemical industries.
The working part of the vibrating screen is fixed and the material is screened by sliding the material along the working surface. Fixed sieves are one of the more widely used in concentrators and are generally used for pre-screening before coarse or medium crushing. It is simple in structure and easy to manufacture. It does not consume power and can directly discharge the ore to the screen surface. The main disadvantages are low productivity and low screening efficiency, generally only 50-60%.
The vibrating screen working surface is composed of a horizontally arranged rolling shaft with a plate on the shaft, and the fine material passes through the gap between the rollers or the plates. The bulk material is moved by the roller to one end and discharged from the end. Such sieves are rarely used in concentrators. The working part of the vibrating screen is cylindrical, and the whole sieve rotates around the axis of the cylinder, and the axis is generally installed with a small inclination angle. The material is fed from one end of the cylinder, the fine grade material is passed through the screen opening of the cylindrical working surface, and the coarse material is discharged from the other end of the cylinder. The rotary screen has a low rotation speed, stable operation and good dynamic balance. However, the mesh hole is easy to block, the screening efficiency is low, the working area is small, and the productivity is low. The concentrator rarely uses it for screening equipment. The vibrating screen body is oscillated or vibrated in a plane. According to its plane motion trajectory, it is divided into linear motion, circular motion, elliptical motion and complex motion. Shaking screens and vibrating screens fall into this category. When the vibrating screen is working, the two motors are synchronously placed in opposite directions to cause the exciter to generate a reverse exciting force, forcing the screen body to move the screen longitudinally, so that the material on the material is excited and periodically throws a range. Thereby completing the material screening operation. The rocking screen is a crank connecting rod mechanism as a transmission component. The motor drives the eccentric shaft to rotate through the belt and the pulley, and the connecting rod reciprocates the body in a certain direction.
The moving direction of the body is perpendicular to the center line of the pole or the suspension rod. Due to the swinging motion of the body, the material on the screen surface moves to the discharge end at a certain speed, and the material is simultaneously sieved. The shaking screen has higher productivity and screening efficiency than the above sieves. The disadvantage is that the power balance is poor. It is now rarely used by concentrators and replaced by vibrating screens with more reasonable structures.
Job characteristics
1 The block eccentricity is used as the exciting force, and the exciting force is strong.
2The sieve beam and the screen box are made of high-strength bolts, which are simple in structure and convenient in maintenance;
3 It adopts tire coupling, flexible connection and stable operation;
4Using small amplitude, high frequency and large dip angle structure, the machine has high screening efficiency, maximum processing, long life, low power consumption and low noise.
According to the structure and working principle of the screening machine, there are roughly the following categories:
1. The working part of the fixed screen is fixed and the material is screened by sliding the material along the working surface. Fixed sieves are one of the more widely used in concentrators and are generally used for pre-screening before coarse or medium crushing. It is simple in structure and easy to manufacture. It does not consume power and can directly discharge the ore to the screen surface. The main disadvantages are low productivity and low screening efficiency, generally only 50-60%.
2. The roller screen working surface is composed of a horizontally arranged rolling shaft having a plate on which the fine material passes through the gap between the rollers or the plates. The bulk material is moved by the roller to one end and discharged from the end. Such sieves are rarely used in concentrators.
3. The working part of the cylindrical sieve is cylindrical, and the whole sieve is rotated around the axis of the cylinder, and the axis is generally installed with a small inclination angle. The material is fed from one end of the cylinder, the fine grade material is passed through the screen opening of the cylindrical working surface, and the coarse material is discharged from the other end of the cylinder. The rotary screen has a low rotation speed, stable operation and good dynamic balance. However, the mesh hole is easy to block, the screening efficiency is low, the working area is small, and the productivity is low. The concentrator rarely uses it for screening equipment.
4. The plane motion sieve body is a plane that oscillates or vibrates. According to its plane motion trajectory, it is divided into linear motion, circular motion, elliptical motion and complex motion. Shaking screens and vibrating screens fall into this category.
Scope of application
Vibrating screens are used in a wide range of applications, and almost all aspects of life require the use of various types of vibrating screens in processing and manufacturing!
The vibrating screen is mainly used in mining, coal, smelting, building materials, refractory materials, light industry, chemical industry, medicine, food and other industries.
Vibrating screens are most widely used in concentrating plants. According to their different transmission mechanisms, they can be divided into the following types: eccentric vibrating screens, inertial vibrating screens, self-centering vibrating screens, and resonant screens.
Instructions for use
1. The unique screen design allows easy and quick screen change (3 to 5 minutes), and this design allows the use of a variety of screens (nylon, special dragons, PP nets).
2. Screen machine design; compact and easy to assemble, one can operate the screen machine.
3. Compared with other related brand manufacturers, it has a large screening area and high efficiency processing capacity.
4. The parent network completely supports the fine mesh, so the fine mesh can have a long life, and the use of the fine mesh consumables can be reduced, and the long-term production process can reduce the cost.
Function and principle:
The basic principle is to convert the rotary motion of the motor into a horizontal, vertical, and inclined three-dimensional motion by the weight (unbalanced weight) installed on the upper and lower ends of the motor shaft, and then transmit this motion to the screen surface. Changing the phase angle of the upper and lower weights can change the direction of travel of the material.
Daily maintenance
First, before starting:
1. Check the coarse mesh and fine mesh for damage
2. Whether each set of collars is locked, the vibrating screen
3. Check if the V-ring of the screen frame of the vibrating screen is damaged. If it is damaged, it needs to be repaired in time to prevent material leakage.
Second, when starting:
1. Pay attention to the presence or absence of abnormal noise
2. Is the current stable?
3. Vibration with or without abnormalities
Third, after use: clean up after each use.
Regular maintenance
Regularly check the coarse mesh, fine mesh and spring for fatigue and damage. Whether the parts of the fuselage are damaged by vibration, the parts to be lubricated must be lubricated.
main effect
With the further development of China's economic construction and scientific research, new-purpose vibrating screens will continue to emerge, and their use in various sectors will increase and will play an increasingly important role.
1. In engineering applications
In the past 30 years, Professor Wen Bangyu has applied the theoretical results and application results obtained to the engineering practice. For example, large-scale exciter deflection self-synchronizing vibrating screen, inertial resonance probabilistic screen, new structure vibrating crusher , new structure vibrating cooler, etc., and successfully applied to the industrial sector, have achieved significant economic and social benefits. He has won more than 10 national invention awards, national scientific and technological progress awards and provincial and ministerial awards.
2. Innovative aspects of design theory and method
The theory and method of mechanical dynamic design of vibrating screen are presented, especially the dynamic design theory and method of nonlinear vibrating screen machinery, and the comprehensive design method based on dynamic optimization, intelligent optimization and visual optimization. The design of such products, especially the research and development of new products, provides the theoretical reference and basis for the plant.
3. In terms of innovation in nonlinear dynamics theory
Summarize Professor Wen Bangyu's long-term systematic research and experiments on the theory of vibration and wave utilization technology and equipment work, and use many branches of engineering for vibrating screens (such as the application of vibration synchronization and control synchronization theory, nonlinear vibration The theoretical basis is created by the use and utilization of wave energy.
4. In terms of institutional innovation
A variety of new vibrating screen mechanisms have been proposed. For example, the exciter deflecting self-synchronizing vibrating mechanism and the special form of nonlinear inertial resonant vibrating mechanism have obtained a number of national patents. In terms of process theory and technological innovation, Professor Wen Bangyu is engaged in the research of vibration utilization engineering in process theory and practical application. For example, the theory of probability-equal thickness sieving, the theory of material gliding and throwing motion on various working surfaces, and the theory of vibrating screen sieving process are proposed and applied to the working process of vibrating machinery. Edit this paragraph weight adjustment
Since part of the work of the vibrating screen is a fine operation, it is impossible to avoid such problems during operation. Sometimes, when the material is sieved, the discharge condition is different. At this time, the upper and lower weights can be adjusted to adjust the material screening. Achieve better results.
First, we can adjust the additional weight of the vibration motor, and attach additional weights on one side of the upper and lower weights (upper and lower eccentric blocks).
This can increase the exciting force of the vibrating screen, and appropriately increase or decrease the exciting force and adjust the number of additional weights according to the difference between the specific gravity of the material to be sieved by the customer and the number of layers of the selected vibrating screen.
Secondly, the phase angle of the upper and lower weights of the vibrating motor can be changed, which changes the residence time and trajectory of the material on the vibrating screen.
Furthermore, the bottom cylinder of the vibrating screen can be opened, and the fixing bolt of the lower weight can be loosened, and the phase angle of the upper and lower weights is adjusted in the opposite direction of the vibrating screen discharge port according to the movement track of the sieved material. Then, the material is placed on the vibrating screen and the vibrating screen is energized to see the movement track of the material on the screen surface. If the material separation efficiency, permeable rate, and treatment amount, the distribution of the material on the screen surface is relatively uniform, and the fixing bolt can be tightened and then tightened.
Common malfunctions
1, the motor is not moving badly
2. Abnormal sound
3. Raw materials cannot be automatically discharged
4. Fine mesh is easy to break
5. Stainless steel frame outlet split
Inspection project countermeasure
(1) Confirm the power @open switch
(2) Insufficient cable length makes poor contact @change cable
(3)Whether the cable is broken @æ¢ç”µç¼†çº¿
(4) One-way rotation and the coil burned off @æ¢ç”µæœº
(5) Injecting too much lubricant @Continuous operation (1) The bundle ring screw is not locked; @Lock nut (2) The collar is not securely fitted @Locked copper nut (3) The base is unstable @Stabilization abutment (4) The spring is broken @Replace the spring (5) The body is in contact with other hardware. @Remove the space about l0 cm
(6) the motor alloy steel screws releasably locking @ OK
(7) The discharge port is in contact with it @ makes it not contact (1) The motor is running in the wrong direction @Replace the power line contact sequence (2) The angle between the upper and lower eccentric blocks is too large @The angle is less than 90 degrees (3) Up and down eccentricity Block device error @ heavy eccentric block in the upper light eccentric block in the next (1) raw material directly impact the mesh surface @change buffer (2) fine mesh is not tightened @replacement (3) coarse mesh has been damaged @æ¢ç²—网 (4 ) Rubber pad thinning @Replacement (1) Pipes that are too heavy or hoisting weights @Isolation of the outlet (2)The collar is not evenly locked @Locking collar
Seven, mechanical maintenance
Daily maintenance:
1. Before starting: (A) Check the coarse mesh and fine mesh for damage (B) Whether each set of collars is tight
2. At startup: (A) Pay attention to the presence or absence of abnormal noise (B) Whether the power supply is stable (c) Vibration or not
3. After use: Clean and regular maintenance after each use:
1. Regularly check the thickness of the mesh and spring for fatigue and damage, and whether the parts of the fuselage are damaged by vibration.
2. The motor runs for about two weeks and must be replenished with a timely lithium grease (ZL-3). Accumulate the operation for l500 hours, check the bearing, and replace if it is damaged.
Special Note
When inquiring about DH series three-dimensional vibrating screening and filter information, please provide the following information together to make a quick and accurate response to your enquiry.
(1) Raw materials to be processed: name particle size structure specific gravity water content viscosity temperature other
(2) Purpose of use: de-filtering, grading, granulation, other
(3) Processing capacity: kg / hour liter / hour (
4) Screen size (mesh or aperture) and sieve number
(5) Working hours
(6) Other special requirements: such as: high temperature resistance, acid resistance, sealed screening, etc.
Simple maintenance plan for vibrating screen
During the operation of the vibrating screen, the parts are often worn and scratched due to the “hard to hard†metal mating relationship, such as the wear of the vibrating screen spindle bearing. After the above problems occur, the traditional solution of the enterprise is repairing after repair welding or brush plating, but both have certain drawbacks: the thermal stress generated by the repair welding high temperature cannot be completely eliminated, which is easy to cause material damage, resulting in bending or breakage of the parts. While the brush plating is limited by the thickness of the coating, it is easy to peel off, and the above two methods are all repairing the metal with metal, and the "hard-to-hard" cooperation relationship cannot be changed, and under the combined action of each force, the wear is still caused again. In the contemporary Western countries, the repair methods of polymer composite materials are often used for the above problems, and the application system has many applications, such as the super-adhesive strength and excellent compressive strength. The application of polymer material repair can be dismantled and free of machining. There is no effect of repair welding thermal stress, and the repair thickness is not limited. At the same time, the metal material of the product does not have the concession, which can absorb the shock and vibration of the equipment, avoid the possibility of re-wearing, and greatly extend the service life of the equipment components. Enterprises save a lot of downtime and create huge economic value. Polymer material treatment is really sieve wear
Application needs
The pharmaceutical industry and people have a closely related relationship, so the state has strict requirements for the pharmaceutical industry. The pharmaceutical industry also requires strict screening of materials. The most basic is that the vibration screening equipment used in the pharmaceutical industry must be stainless steel 304 or even 316 material, part of the contact material is not allowed to be contaminated by impurities, so rubber parts must also meet food-grade hygiene standards (silica gel), and the screening equipment required by the pharmaceutical industry must pass GMP production standards. The use of vibrating screens in pharmaceuticals has very strict requirements and must meet the GMP production standards of the pharmaceutical industry. This is related to whether the drugs that pass the screening will be contaminated.
In fact, as an uncomplicated screening machine, the so-called GMP standard is actually stainless steel in the material. In the selection of rubber parts, the medical grade must be selected. The equipment must be polished inside and outside, no black spots. , no burrs. skills
First, the use of skills
1. Check if the attached safety splint is removed before starting.
2. Check that all locking parts are secure:
Maintenance
1. Although the vibrating screen does not require lubricating oil, it still needs to be overhauled once a year, the liner is replaced, and the two screen surfaces are trimmed. The vibration motor should be removed and checked, and the motor bearings should be replaced with oil. If the bearing is damaged, it should be replaced.
2. The sieve should be taken out frequently, and the sieve surface should be checked regularly for damage or unevenness, and whether the sieve hole is blocked or not.
3. It is recommended to make a support frame to hang the spare screen surface.
4. Always check the seals and find that they are worn out or defective and should be replaced in time.
5. Check the screen pressing device every shift and press it if it is loose.
6. Check the connection of the feed bins loosely every shift. If the gap becomes large, causing a collision, the equipment will be broken.
7. Check the sieve support device for each shift to observe whether the hollow rubber mat is obviously deformed or degummed. When the rubber mat is broken or transitional flattened, two hollow rubber mats should be replaced at the same time.
Industry Standard
JB 20034-2004 Medicinal vortex vibrating screening machine
JB-T 2444-1999 Seat type double shaft vibrating screen
JB-T 5508-2004 Cold Mine Vibrating Screen Vibrating Screen
JB-T 9033-1999 SZR type hot ore vibrating screen
JB-T 938-1999 Single-axis vibrating screen for coal
JB-T 6388-2004 YKR round vibrating screen
JB-T 5508-2004 Cold Mine Vibrating Screen
JB-T 6389-1992 ZKR linear vibrating screen
JB-T 7891.1-1999 YA type circular vibrating screen
JC-T 580-1995 cement shaker
JB-T 10460-2004 Banana linear vibrating screen
Screening factors affecting the vibrating screen
The technical and economic indicators of the screening process are screening efficiency and productivity, the former being the quality indicator and the latter being the quantitative indicator. There is a relationship between them, and it is also related to many other factors that determine the outcome of screening. The factors affecting the screening process can be roughly divided into three categories:
First, the physical properties of the material being sieved
It includes the particle size composition of the material itself, humidity, mud content and shape of the particles.
When the fines content of the material is large, the productivity of the sieve is also large. When the humidity of the material is large, the screening efficiency generally decreases. However, the larger the mesh size is, the smaller the influence of water is. Therefore, for the wet material with large moisture content, in order to improve the screening process, it is generally possible to adopt a method of increasing the mesh hole or adopting wet screening. The material contains a large amount of mud (when the mud content is greater than 8%) should be wet screening, or pre-washed.
Second, the nature of the screen surface and its structural parameters
The linear vibrating screen makes the particles and the screen surface move vertically, so the screening efficiency is high and the production capacity is large. The relative movement of the particles and the screen surface is mainly a rod sieve, a plane vibrating screen, a cylinder sieve, etc. which are parallel movement, and the screening efficiency and productivity are low.
For a given material, the productivity of the sieve and the efficiency of the screening are determined by the size of the mesh. The productivity depends on the width of the screen surface, and the productivity of the screen surface is high. The screening efficiency depends on the length of the screen surface, and the screening length is high. The general aspect ratio is 2.
The larger the effective sieve area (i.e., the ratio of the mesh area to the entire screen area), the higher the productivity per unit area and the screening efficiency. The larger the mesh size, the greater the productivity of the unit sieve surface and the higher the screening efficiency.
Third, the impact of production conditions
When the load of the sieve is large, the screening efficiency is low. To a large extent, the peace rate of the circular vibrating screen depends on the size of the mesh and the overall screening efficiency; the larger the mesh, the lower the efficiency of the screening, the higher the productivity.
Feed uniformity is of great significance to the screening process.
The inclination of the sieve should be appropriate and generally determined by experimentation. Then there is the amplitude and vibration of the sieve, which is related to the structural properties of the sieve. Within a certain range, increasing the vibration can improve the screening index.
Spiral flashing vibrating screen and rotary vibrating screen
The word spiral flash is probably heard by everyone in the dryer industry. Yes, the spiral flashing vibrating screen is deeply modified on the basis of the dryer. The spiral flashing vibrating screen is mainly composed of a feeder, a drying chamber, a cyclone separator and a bag collector. The working process is as follows: the dried material enters the drying chamber from the feeder, the hot air enters the drying chamber along the tangential direction, and flows upward from the bottom of the drying chamber at a high speed rotation state, and is in full contact with the material, so that the material is in a stable balanced flow. In the state of the mixture, under the action of the impact of the stirrer in the drying chamber and the high-speed swirling airflow, the material block is dispersed into irregular granular shapes, and the larger undried material moves toward the chamber wall due to its large sedimentation speed. The above process is repeated by dropping to the lower portion of the drying chamber. In the feed industry, it can be used to dry blood meal, meat and bone meal, fish meal, protein paste, dregs and other materials.
We then share the rotary vane shaker. The rotary vane shaker sounds like a vibrating screen, but it is not. The rotary vane vibrating screen belongs to the downstream vibrating screen. The working process is roughly as follows: the material is put into the rotary drum through the feeding device, and the lifting plate installed in the cylinder drops the material to the top, and the material is dropped into the cylinder when the material is dropped. The high-speed rotating blades break, so reciprocating, moving all the way to the exit. At the same time, the hot air generated by the combustion furnace enters the cylinder and is in full contact with the material, so that the material is quickly dried and then discharged through the conveyor at the discharge end. Rotary vane shaker can be used to dry chicken cattle pig manure, pasture, dregs and so on.
Practical application
The role of the vibrating screen in this process:
1. Screening: Screening is the division of particles and powder into particles of different sizes. A single vibrating screen can be matched to a 4-layer screen, which can continuously sort 2-5 levels and control a narrow particle size range;
2. Screening impurities: High-performance screening machines can quickly remove large particles or small particles of pulp with low percentages during high-flow processing. The vibrating sifter can quickly remove non-soluble solid substances in various types of slurry and continuously discharge slag.
Learn about the production steps of silicon carbide micropowder:
1. The silicon carbide raw material is taken, crushed by a crusher, and sieved to silicon carbide particles of ≤ 5 mm, and then shaped into silicon carbide particles of ≤ 2 mm by a shaping machine, wherein the oval particles account for more than 80%, and then, Pickling and removing impurities and drying;
2. The dried silicon carbide particles are pulverized into a silicon carbide powder having a d50=9.5-11.5 μm by a mill. When pulverized, the main current of the mill is set to 65-75 A, and the fan flow rate is set to 40-50 m? Min, the speed of the analyzer is 400-600 rpm;
3. Then, the silicon carbide powder is classified by a vortex flow classifier. When classifying, the flow rate of the fan of the vortex flow classifier is 25-43 m?/min, and the speed of the classifying wheel is 2600-3300 rpm, and the particle size is separated from the classification port. Ds94=6.5-5.5μm finished product A, the cyclone outlet is divided into semi-finished products with ds94≤5.5μm;
4. The semi-finished product separated by the cyclone of the vortex flow classifier is further classified by the impeller type air classifier. When classifying, the flow rate of the fan of the impeller type air classifier is 25-10 m?/min, and the speed of the classifying wheel is 1300-1700. Transfer/min, the finished product B with a particle size of ds94=4.5-3.0 μm is separated from the classification port, and the by-product is separated by the cyclone.
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