Common faults of linear vibrating screen and their solutions

Linear vibrating screen is one of the commonly used screening equipment.It has the advantages of high screening efficiency,high screening quality,and large processing capacity,and is favored by customers.Then the editor of Hiside below analyzes the common faults during operation of the linear vibrating screen and gives solutions.

1. The problem of vibration

When the linear vibrating screen is screened,the material on the screen surface is discontinuous,and the vibrating screen has vibration problems when starting and stopping.The solution to such problems is to adjust the position of the eccentric wheel and increase the mass of the eccentric wheel.Another:The occurrence of such problems will reduce the service life of the spring and should be resolved in time.

2. The bearing is damage

The bearing seat of the linear vibrating screen is easy to vibrate,the bearing is easy to be damaged by heating,and the bottom beam of the screen is easy to weld or break.The problem is that the mass of the eccentric wheel of the sieve machine is too large,which results in the increase of the exciting force and the increase of the amplitude of the sieve.The common solution is to reduce the mass of the eccentric or change a spring with a larger stiffness to deal with it.Under the premise of ensuring the strength of the shaft,it can be dealt with by changing different types of bearings or changing the strength of the bearing seat.At the same time,the necessary reinforcement of the bottom beam of the screen machine can also extend the service life of the screen.

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3. Low amplitude

The amplitude of the linear vibrating screen is lower than the required parameters.The detailed performance is that the amplitude is too low.If the amplitude is low,it will reduce the overall treatment effect of the linear vibrating screen;on the contrary,if it is the amplitude of the linear vibrating screen If the condition is too high,it will have a certain impact on the service life of the bearing seat,bearing,and bottom beam of the vibrating screen.Therefore,under normal conditions,the user can directly modify the quality of the eccentric wheel directly according to the conditions of the application site of the linear vibrating screen,or use springs of different stiffness to adjust the amplitude of the linear vibrating screen to a certain extent,thereby Meet the needs of production.

The general introduction to the common faults and solutions during the operation of the linear vibrating screen is the above.In order to ensure the quality of the vibrating screen,everyone is welcome to buy the vibrating screen of Hiside.The product is of excellent quality and outstanding performance.Please contact us if you are interested.

 

How long is the service life of the vibrating screen?

The service life of the vibrating screen

The life cycle of a vibrating screen depends on the equipment production process and the actual use environment. The production process of a piece of equipment is equivalent to the foundation. If you want to have a long service life, you must lay a solid foundation! Regular vibrating screen manufacturers have a strict production process for the screening equipment at the sales office. Namely: detailed communication→design on demand→plate selection→actual production→assembly finished product→logistics delivery→installation and commissioning. The four links of communication, design, plate and assembly are directly related to the life of the vibrating screen.

Factors affecting the service life of vibrating screen

Vibrating Screen

1. The influence of vibrating screen design
Whether the communication is detailed or not affects whether the finished product meets the actual production requirements of the user. Whether the design is qualified or not is an important link related to the user’s actual production output and equipment service life. Therefore, only detailed communication in the early stage can design and produce screening equipment that meets the user’s production requirements.

2. The impact of using plates

Different thicknesses of the same plate and different element content will also affect the service life of the vibrating screen. Common materials for vibrating screens are Q235 carbon steel and 304 stainless steel. Take the round screen as an example: Q235 carbon steel plate thickness is 3mm for the screen frame and 5mm for the bottom barrel. , 304 stainless steel sheet thickness is 2mm for the screen frame and 5mm for the bottom barrel. Simply put, the thickness of the same material is different, and the different element content will directly affect the service life of the equipment.

3. The impact of vibrating screen production and operation

In the process of using the vibrating screen, the nature of the material, the production environment, and the feeding method will also affect the service life of the equipment. In the actual production process, the production staff must strictly follow the design drawings and requirements to produce so as to ensure that it will not be affected! In addition, the vibrating screen The operating environment is also one of the key factors affecting the service life, such as environmental problems such as humidity and corrosion.

Causes and solutions of the hole blocking of the vibrating screen

The core component of the vibrating screen is the screen. A good screen is an important condition to ensure the accuracy and efficiency of the vibrating screen. However, if too much material is fed at a time, it is inevitable that the screen will block the holes, and the screen will wear out in the long run. The situation will affect the accuracy of the vibrating screen. The following are several common reasons and solutions for the blockage of the vibrating screen mesh for your reference.

Causes of blocking holes in vibrating screen

(1)Contain a large number of critical material particles close to the separation point. That is, the particle size of the crushed stone is critical to the mesh size of the screen. During the screening of the stone, such particles are stuck in the mesh and cannot pass through the screen smoothly, which is called critical hole blocking.

(2) There are many materials that have multiple contact points on the screen.

(3)There are many flake particles. Due to the crushing or the stone itself, there are many flake materials in the stone material, and the flake materials themselves cannot be smoothly passed through the screen during the screening. At the same time, the flake materials are intertwined into a net shape, which prevents other materials from passing through the screen and causes hole blocking.

(4)The diameter of the steel wire for the screen is too thick.

(5)The screened material contains high moisture and viscous substances such as mud and sand. Because there is a lot of mud in the stone, or when the stone requires water washing, the fine-grained stone will stick to each other into agglomerates due to the intervention of water on the one hand, and the soil will stick to the screen surface on the other hand, making it difficult to screen the material and causing blockage .

Except for the fourth type, the first and second types are inevitable. The third and fifth types are more or less existent. The fixed mesh screen cannot effectively overcome the impact of critical material particles on the screen hole. Blockage, resulting in low screening efficiency of the vibrating screen. Generally, the screening efficiency of a vibrating screen with a fixed mesh screen is less than 50%. Even if the amplitude is increased, it cannot effectively solve the blockage. Moreover, increasing the amplitude may affect the service life of the screen.

Vibrating Screen

Method to solve the hole blocking of vibrating screen

In order to effectively solve the above-mentioned hole blocking problem, the effect of blocking holes can be achieved by changing the form of the mesh structure of the vibrating screen. Here are several kinds of blocking hole screens:

(1)Under the premise of meeting the construction requirements, deform the mesh and use a certain proportion of rectangular holes. For example, the original requirement of 3.5mm*3.5mm mesh is changed to 3.5mm*4.5mm rectangular holes. However, the direction of the mesh is different, which will affect the screening efficiency or the service life of the screen to a certain extent.

(2)It adopts diamond-shaped hole anti-blocking screen, which is made of the same two adjacent screen bars with small vibrations, which has a better anti-blocking effect.

(3)In order to further improve the anti-blocking effect of the vibrating screen, some manufacturers have introduced a triangular hole anti-blocking screen. The feature of this screen is that of the two adjacent screens, one is a static screen and the other The root is a moving screen.

In fact, there are many factors that affect the efficiency of vibrating screens, and we have also introduced them in detail in the article how to improve the screening effect of mine vibrating screens. In addition to the clogging of the screen, improper installation of the screen can also cause low efficiency of the vibrating screen. Therefore, every time you replace the vibrating screen, you must strictly follow the instructions provided by the manufacturer.

Instructions for use of linear vibrating screen

The linear vibrating screen is mainly composed of a screen box, a mesh frame, a screen mesh, a vibration motor, a motor base, a damping spring, and a bracket. Using the vibrating screen exciter as the vibration source, the material is thrown up on the screen while moving forward in a straight line. The material enters the inlet of the screening machine evenly from the feeder and produces several specifications through the multi-layer screen. The oversize and undersize items are respectively discharged from their respective outlets. It has low energy consumption, high output, simple structure, easy maintenance, fully enclosed structure, no dust spillage, automatic discharge, and is more suitable for assembly line operations.

Features of linear vibrating screen

(1) The design of the screen machine is exquisite and easy to assemble. One person can operate the screen machine.

(2) Compared with other related vibrating screens, it has a larger screening area and effective processing capacity.

(3) The unique structure design of the screen makes it easy and quick to replace the screen (only 3 to 5 minutes). In addition, this design allows the use of various material screens.

(4) The mother net completely supports the fine mesh, so the fine mesh can have a longer lifespan, and the use of fine mesh consumables is reduced, which can reduce many costs for the long-term production process.

(5) The linear vibrating screen has the characteristics of high screening accuracy, simple structure, convenient maintenance, low energy consumption, low noise, good sealing, reduced dust pollution, long screen life, and can be used for automated operations in assembly line production.

Working principle of linear vibrating screen

The linear vibrating screen is driven by dual vibrating motors. When the two vibrating motors are running synchronously and in opposite directions, the exciting force generated by the eccentric blocks cancels each other out in the direction parallel to the motor axis, and stacks in the direction perpendicular to the motor axis to form a resultant force, so the material is in the linear vibrating screen The motion trajectory on the machine is a straight forward parabolic motion. The two motor shafts have an inclination angle relative to the screen surface. Under the combined force of the exciting force and the material’s self-gravity, the materials are thrown up and jump forward on the screen surface for linear motion, so as to achieve the purpose of screening and grading the materials.

Linear vibrating screen installation

1. Screen box: It is welded from several steel plates with different thicknesses, with certain strength and rigidity, and is the main part of the screen machine.

2. Mesh frame: It is made of wood with less deformation, which is used to keep the screen flat and tight to achieve normal screening. If the specific gravity is large or the output is large, the metal screen frame can be used.

3. Screen: Use a composite national standard stainless steel screen.

4. The use and maintenance method of vibrating screen exciter can refer to its instruction manual.

5. Motor pedestal: The motor pedestal of the standard type (the motor is installed under the screen box) is movable. The connecting screws must be tightened before use, especially the new sieve must be tightened repeatedly three days before the trial to avoid loosening. accident.

6. Vibration damping spring: prevents vibration from being transmitted to the ground and supports the full weight of the screen box. When installing, the spring must be perpendicular to the ground.

7. Bracket: It is composed of channel steel and supports the main body of the vibrating screen. The pillars must be perpendicular to the ground during installation, and the channel steels under the two pillars should be parallel to each other. Rubber springs have been tested for static stiffness before they leave the factory. Springs with the same (or similar) stiffness should be selected and placed on different supporting positions of the same vibrating screen.

When installing, place the rubber spring on the lower support seat, make the boss on the support seat enter the inner hole of the spring, and then hoist the main body. Make sure that the inner hole of the rubber spring is centered on the boss of the support plate. The box is dropped vertically and placed on the rubber spring. At this time, the height of the rubber spring at each support point should be the same, and the error should not be greater than 2mm. The connection of each part of the sieve machine must be firm and reliable, all bolts must not be loose, and there must be no abnormal sound at each part. The small gap between the vibration-absorbing part on the main body and the surrounding fixed objects is 30-50mm.

High frequency dehydration vibrating screen

Regular inspection and maintenance of linear vibrating screen

1. The linear vibrating screen should be equipped with electrical protection devices.

2. In the early stage of operation, check the anchor bolts at least once a day to prevent loosening.

3. When the motor rotation direction does not meet the requirements, adjust the power phase sequence.

4. The motor should be well lubricated. Replenish lithium grease (ZL-3) every two weeks or so. When refueling, add an appropriate amount of lithium grease through the oil cup. When using sealed bearings, the motor is not equipped with an oil cup.

5. After the equipment has been running for 1500 hours, the bearings should be checked and replaced immediately if there is serious damage.

6. When the linear vibrating screen is used again after being parked for a long time, the insulation resistance should be measured. It should be greater than 0.5 megohm for 500V megohmmeter measurement.

Before starting the linear vibrating screen, check whether there are obstacles that hinder the operation of the screen machine and whether the connecting bolts are fastened everywhere, especially the fixing bolts of the exciter, support seat, and screen plate should be tightened again. Check whether the rotation directions of the two vibration motors or exciters are opposite. If the rotation directions are the same, change the power connection of one motor so that the rotation directions of the two motors are opposite. After 4 hours of continuous operation, measure the bearing temperature. The bearing temperature should not exceed 75°C. Before the screen machine is stopped, the feeding should be stopped first, and then stop after the screen surface material is finished. After the pause, clean up the materials and debris on the screen surface in time. The vibrating motor or vibrating screen exciter should be refueled once after 3 months of use, minor repairs every six months, and major repairs every year.