What should I do if the linear vibrating screen fails?

The linear vibrating screen is driven by double exciters. When the two exciters are rotated synchronously and in opposite directions, the exciting forces generated by the eccentric blocks cancel each other in the direction parallel to the motor axis, and in the direction perpendicular to the motor axis The stack is a resultant force, so the motion trajectory of the screen machine is a straight line. The two motor shafts have an inclination angle relative to the screen surface. Under the combined force of the exciting force and the self-gravity of the material, the material is thrown up on the screen surface and moves forward in a straight line, so as to achieve the purpose of screening and grading the material.

Can be used to automate operations in the assembly line. It has the characteristics of low energy consumption, high efficiency, simple structure, easy maintenance, and fully enclosed structure without dust spillage. The high sieving mesh number is 400 meshes, which can screen out 7 kinds of materials with different particle sizes. In the daily use of the linear vibrating screen, it is inevitable that some damage will not occur. The following vibrating screen manufacturers will introduce the common faults and solutions of the linear vibrating screen in detail.

Linear vibrating screen

1. Pipe beam fracture

If the wall of the tube beam is too thin, it may cause fracture. In this case, the same type of thick-walled tube or a larger type of tube beam should be used. But it should not be too large or too thick, because this will increase the vibration quality of the sieve and bring about many problems; the connection of each sieve plate of the dehydration and de-intermediation screen must have horizontal and vertical layers. If there is no vertical layer, water The pipe beam will leak from the gap between the screens and the pipe beam will be easily broken at the flushing place; the wider the screen, the easier the pipe beam will be broken.

2. Beam fracture

The fracture of the beam is mostly due to the long working time at the critical frequency, the relaxation of a large number of high-strength bolts that fasten the side plates, the severe deformation of the spring, and the difference between the left and right heights. The beam is broken. At this time, the damaged structural parts and beams should be replaced, the bolts should be tightened, and the quality of the eccentric block should be adjusted.

3. The screen frame is broken

The screen frame is prone to breakage due to trembling. The best way to solve this problem is to thicken the side plate, or add an additional plate to the local area of the side plate near the exciter to enhance the rigidity of the entire screen frame.

Arc vibrating screen

4. The discharge port is broken

Since the vibrating screen is generally made of non-standard products, the size required by different customers is different, and some require the discharge port to be extended forward or downward, so that the discharge port will be broken relatively slightly more. If it is the initial design, the plate thickness or ribs can be strengthened. In case of accidental breakage, the material quality can be checked.

In addition, check whether the parameters of the vibrating screen are correct. In addition, in the feeding process, it is necessary to avoid excessive feeding of the vibrating screen at one time, and the screen can be basically used completely. The outlet of the vibrating screen is discharged, and the excessive weight backlog will also cause the breakage of the discharge port of the vibrating screen.

If the linear vibrating screen fails, you can refer to the above methods to solve it, but if your problem has not been solved, please contact the manufacturer in time for after-sales service, and ask professionals to repair it in time, so as not to reduce your work efficiency.

For more details about the common problems of linear vibrating screen, please click to visit:

What should I do if the vibration force of the linear vibrating screen is light? Causes and solutions

What are the reasons for the mixing of the linear vibrating screen? Causes and solutions

Influence and adjustment method of insufficient tension of linear vibrating screen mesh

 

The working principle and working process of high frequency dewatering vibrating screen

Nowadays, the coal slime content in the products of the coal industry increases and contains a lot of water, which brings certain difficulties to the dehydration of coal slime. In the past, the investment in the water treatment of coal slime was relatively large, which was not conducive to the control of production costs, but now the high-frequency dewatering vibrating screen is used, which has the characteristics of large processing capacity and simple process system, which can well dewater the coal slime. High-frequency dewatering screen is a kind of vibrating screen with high frequency and high vibration intensity as the main features. It is suitable for wet separation and solid-liquid separation of fine-grained materials. The vibrating screen manufacturer summarized the working principle of the high-frequency dewatering vibrating screen and introduced the high-frequency dewatering vibrating screen in detail.

Working principle of high frequency dewatering vibrating screen

The working principle of the high-frequency dewatering vibrating screen is to use high-frequency vibration to destroy the surface tension of the pulp, and the fine-grained materials will vibrate at a high speed on the screen surface to accelerate the separation of large-density minerals, and increase the contact between the materials smaller than the separation-sized materials and the screen holes. Probability, double vibration motor or flange type vibration exciter, the two motors are driven outside to make self-synchronized rotation in opposite directions, so that the screen body performs periodic reciprocating motion along a straight line, and fine-grained materials can be quickly screened out through the screen holes , in order to achieve the purpose of screening and dehydration.

Because the high frequency screen adopts high frequency, on the one hand, it destroys the tension on the surface of the pulp and the high-speed oscillation of the fine-grained materials on the screen surface, accelerates the separation of the large-density useful minerals, and increases the contact between the materials smaller than the separation size and the sieve holes. probability. Therefore, better separation conditions are created, so that the materials smaller than the separation particle size, especially the particles with large specific gravity, together with the ore pulp, pass through the sieve holes to become the under-sieve product.

High frequency dehydration vibrating screen

Workflow of high frequency dewatering vibrating screen

1. Two vibration motors with the same parameters installed on the excitation beam symmetrically rotate in opposite directions when they are connected to electricity, and each generates an equal centrifugal force, and the components of the two forces in the vertical vibration direction cancel each other out in opposite directions;

2. The component forces in the parallel vibration direction are superimposed on each other to form a linear vibration force, and the linear vibration force continuously acts on the screen body in a reciprocating cycle, so that the screen body vibrates on the buffer spring;

3. At the same time, the buffer spring reduces the dynamic load of the screen body to the support foundation of the screen machine, and the screen body drives the screen surface to vibrate synchronously, and transmits the force to the material on the screen;

4. The impact material is thrown up on the screen surface to advance for dehydration, the material is continuously input from the feeding chute, and dehydrated through the screen surface, the under-screen material is discharged into the under-screen chute, and the over-screen material is discharged into the discharge chute.

Motion characteristics of high frequency dewatering vibrating screen

According to the needs of mechanical structure and process parameters, the vibrator of the high-frequency dewatering vibrating screen is arranged above the center of gravity of the screen box. This arrangement makes the motion trajectory of the screen machine ellipse at the feeding end, round in the middle, and ellipse at the discharging end. , so the motion trajectory of the high-frequency dewatering vibrating screen is ellipse-circle-ellipse.

Because of this unique motion feature, the long axis of the ellipse at the feed end of the high-frequency dewatering vibrating screen forms an acute angle with the angle between the screen and the long axis of the ellipse at the discharge end, and the angle between the long axis of the ellipse at the discharge end and the screen surface forms an obtuse angle. In this way, the moving speed of the material at the feeding end is greater than that at the discharging end, which ensures that the material can be loosened quickly at the feeding end of the screen, and the material layer is thinner, so that the fine-grained material is layered as soon as possible. The sieve, the water mucosa is broken and dehydrated; and the material speed at the discharge end is small, which can prolong the dehydration time of the material on the sieve surface, thereby improving the dehydration effect. This feature of the screen machine strengthens the dehydration effect.

Linear vibrating screen

Advantages of high frequency dewatering vibrating screen

1. Simple and compact structure, high rigidity, high strength and balanced force distribution;

2. The service life is long, and the overall service life of the vibrating screen equipment is as high as 5 years;

3. The screen can be made of wear-resistant polyurethane material, with long service life and high screening efficiency;

4. Low working noise, the noise is lower than 75 decibels, and the operation is stable;

5. Light weight, low power consumption, high vibration intensity (9-12mm), and high screening efficiency;

6. The variety is complete, which can fully meet the screening process requirements of different material characteristics and processing capacity;

7. The operation and maintenance of the screen machine is simple, cost-effective, sufficient spare parts, and timely and thoughtful service. Below we will introduce the maintenance of the dewatering vibrating screen.

Maintenance of high frequency dewatering vibrating screen

1. Check whether the bolts of various parts are loose at any time, and whether the screen frame collides with the chute, etc.

2. The excitation current (amplitude) can be adjusted according to the ore properties and material requirements. In order to make the screen machine complete the task under the premise of high efficiency, the excitation current premise experiment can be done.

3. The electromagnetic exciter and the control box should be protected from water to avoid short circuit. Cover the exciter with a rubber sheet to prevent water and ore slurry from falling into it, forming a short circuit and blocking the air gap.

4. When the equipment is in normal operation, the ore feeding concentration of the sieve should be observed frequently, so that the concentration should be controlled at about 40%, so as to improve the classification efficiency.

5. When the slurry stream fed into the screen by the distribution bucket is too far, the position or angle of the screen frame should be adjusted in real time, so as not to affect the classification efficiency.

6. Because the screen has high classification efficiency, good dehydration function and high concentration of the amount on the screen, the slurry in the screen above the screen has poor mobility, so it should be equipped with a water pipe.

To sum up, the working principle of the high-frequency dewatering vibrating screen is to use high-frequency vibration to destroy the surface tension of the pulp, accelerate the separation of large-density minerals, and increase the probability of contact between the materials smaller than the separation size and the screen holes, and the fine-grained materials are sieved through the screen holes. point. When purchasing, we need to find a suitable vibrating screen model, because different models and specifications have different feeding rates, ranging from ten tons per hour to two hundred tons per hour, and we need to choose according to our own production needs.

 

Influence and adjustment method of insufficient tension of linear vibrating screen mesh

If the material wants to be screened, it must pass through the screen on the linear vibrating screen. When using the screen, a very critical factor is the tension of the screen, which is related to the screening effect of the material and the linear vibrating screen. production efficiency. Because the insufficient tension of the screen mesh will bring many influences, what are the influences of the insufficient tension of the linear vibrating screen mesh? How to solve it?

Influence of insufficient tension of linear vibrating screen mesh

Arc vibrating screen

1. Lead to material retention

Insufficient tension of the screen mesh of the linear vibrating screen will lead to the retention of materials, thereby preventing the forward movement of the material layer, which may lead to the accumulation of materials, or even block the screen mesh, affecting the production efficiency of the vibrating screen. Therefore, it is necessary to increase the tension of the vibrating screen to flatten the screen surface, thereby increasing the service life of the vibrating screen, and at the same time contributing to the power and productivity of the vibration. Part of the screening will concentrate on the force for a long time, which will easily cause the screening to break, and screen the materials that should not be screened, which will affect the screening effect.

2. Serious stress concentration

If the screen tension of the linear vibrating screen is large, the stress concentration will be serious. If the screen tension is loose, it is easy to produce secondary vibration, and the screen will be damaged prematurely under the action of alternating stress, which will increase the production cost.

3. Affect the sieve penetration area

The bending deformation of the screen mesh of the linear vibrating screen affects the effective sieving area of ​​the sieve hole, so that the material that should have passed through the sieve fails to pass through the sieve, resulting in a decrease in the screening efficiency. Therefore, it is necessary to strengthen the tension of the screen mesh of the linear vibrating screen, so that the entire screen mesh is evenly stressed and its service life is prolonged. Now let’s talk about the solution to the insufficient tension of the screen mesh.

The solution to the insufficient tension of the linear vibrating screen

High frequency dehydration vibrating screen

1. Increasing the tension force can also reduce the bending deformation of the screen, but it will increase the stress on the screen. By applying tension, the screen can withstand a certain degree of prestress, which is conducive to improving the flatness of the screen, but it should be less than the safety allowable value.

2. Add the number of brackets. This can reduce the tortuous deformation of the sieve, but when the number of supports reaches the value, the effect of the addition on the deformation of the sieve is not so obvious. Additionally, as the number of supports increases, the stress on the screen becomes more uniform and the stress concentration decreases.

3. Increasing the tension force and reducing the support spacing can reduce the bending deformation of the screen and improve the flatness of the screen surface.

Adjustment method of mesh tension of linear vibrating screen

Linear vibrating screen

1. Adjustment of the tension of the circular screen

(1) Tension and fixation of the mother and daughter buckle: the method is to use the mother and daughter buckle to fix the screen on the mesh frame, and then tighten it to achieve the effect of tension and fixation. This method has high tension, long service life of the screen, and easy replacement, but it is prone to problems of material leakage and material running;

(2) Adhesive tensioning and fixing: This form is a new method of tensioning and fixing of screen meshes in recent years. The fixing method is to apply a layer of special glue on the mesh frame, and use it after the application is completed. The mesh installation tool evenly spreads the screen mesh on the mesh frame, so as to realize the tension and fixation of the mesh mesh. In this method, the mesh wire is uniformly stressed, and the screen frame and the screen box are in close contact without material leakage and material leakage. However, this method requires tooling and personnel to stick the mesh, and it is inconvenient to replace the mesh;

(3) U-groove tensioning and fixing: This form is a commonly used tensioning and fixing method and is suitable for various types of vibrating screens. The fixing method is to directly use bolts to fix the screen on the mesh frame, which is simple in structure and convenient in installation, but troublesome in disassembly.

2. Adjustment of the tension of the square screen

(1) Tension and fixation by hook plate method: For woven screen mesh or screen plate with thickness less than 6mm, the end of screen mesh or screen plate can be bent into a hook shape: if the diameter of screen wire is small, use thin steel plate and rubber pad to fix it. The edge of the screen mesh is wrapped, and then becomes a hook shape, and then fixed with hooks and bolts; the left and right hooks are tensioned, and the front and rear hooks are tensioned;

(2) Tensioning and fixing of wooden wedges: The punching screen plate and the slit screen surface can be fixed on the vibrating screen frame with wooden wedges. On the two side walls of the screen box, two long angle steels are symmetrically welded, and a section of short angle steel is welded at a certain distance above it, and each of the long angle steels forms an inclination angle. The sieve surface is supported between the two angle steels and pressed with wooden wedges and wooden bars. The wooden wedge expands when it encounters water, which can press the screen surface very tightly. This method is simple and reliable, and the replacement of the screen surface is simple and convenient. This method is mostly used for heavy-duty screens such as mining vibrating screens;

(3) Bolt tensioning and fixing: This form is mainly used in light linear vibrating screens. The tensioning and fixing of the screen mesh of this series of sieves can be achieved by pressing wooden or steel strips and fixing them with bolts. Tight and fixed. It should be noted here that the mesh frame equipped with the wood bar pressing and the steel bar pressing is corresponding, and the price of the wood frame mesh frame will be lower than that of the metal mesh frame. We should pay attention to this when purchasing.

In summary, the influence of insufficient tension of the linear vibrating screen mesh is that insufficient tension will lead to the retention of materials, affect the movement of materials, lead to accumulation, and also affect the screening area of ​​the screen holes, reducing the screening efficiency of the vibrating screen; lead to serious stress concentration. It can be solved by adding the number of supports. In addition, we added the adjustment method of the screen tension. Different types of screens and vibrating screens have different adjustment methods. We need to pay attention when adjusting.