In the production process of the coal industry, crushing equipment is first needed to crush the materials, and then the crushed materials are screened. The vibrating screen is here to undertake the screening task. In the vibrating screen equipment, the bearing is the key component of the equipment. Generally, heavy-duty bearings are selected to facilitate carrying a certain axial load. The working load of the bearing is very large, the speed is high, the temperature is high, and it is accompanied by strong vibration and shock. After time, the bearing needs to be replaced. Replacing the bearings also includes disassembly and installation, so how to disassemble and install the vibrating screen’s bearings? Now, the editor of Hiside will introduce it.

1. Disassembly steps of vibrating screen bearing

①Disassembly of outer ring bearing

Disassemble the outer ring with interference fit, set several screws for extruding the outer ring on the circumference of the shell in advance, tighten the screws evenly while disassembling. These screw holes are usually covered with blind plugs, vibrating screen tapered roller bearings, etc. Separate bearing, set several cuts on the shoulder of the shell, use a spacer, disassemble it with a press, or tap it to disassemble it.

②Disassembly of inner ring bearing

The bearing of the inner ring is generally a cylindrical bore bearing, and this kind of bearing is disassembled to be pulled out by a press machine. At this time, pay attention to let the inner ring bear its pulling force. The inner ring of the large-scale vibrating screen bearing is disassembled by oil pressure. Oil pressure is applied through the oil hole provided on the shaft to make it easy to draw. For bearings with a large width, the hydraulic method and the drawing fixture are used together for disassembly operations. The inner ring of the cylindrical roller vibrating screen bearing can be disassembled by the induction heating method. It is a method to heat the part in a short time to expand the inner ring and then pull it out.

③Disassembly of small bearings

Disassemble the relatively small bearing with adapter sleeve, support the inner ring with the stopper fastened on the shaft, turn the nut back several times, and then use the cushion block and hammer to knock to complete the disassembly.

2. Installation steps of vibrating screen bearing

When replacing a new bearing for a mine vibrating screen, the same bearing as the original model must be used.
①Wash the bearing with kerosene, press it into the bearing seat, fill the ball of the outer ring of the bearing with No. 3 lithium base grease to two-thirds full, apply it evenly with clean hands, install the bearing gland, and use coated bolts to prevent loosening Adhesive fastening bolts compress the bearing gland;
②The bearing is a cylindrical roller bearing with a separable inner and outer sleeve. The inner sleeve of the bearing should be placed on the shaft and in place;
③ Install the bearing seat on the casing. If there is a grease filling hole, it must be aligned with the position. Tighten the bearing seat with fastening bolts coated with bolt anti-loosening glue;
④ Install the inner and outer eccentric block on the shaft and place it in place. If there is a shaft key, install the shaft key in the keyway and then install the outer eccentric block, and install the shaft retaining ring on the shaft;
⑤ Tighten the fastening bolts of the eccentric block, turn the adjustable eccentric block to the angular position before removal and tighten the fastening bolts. After the above assembly is completed, the rotating shaft should have a certain axial movement;
⑥Put on the protective covers at both ends and fasten them with screws.

3. Precautions for disassembly and assembly of vibrating screen bearings

①When disassembling the bearing, pay attention to the removal of the protective cover at both ends, and record the percentage value of the excitation force when the eccentric block is working, so that it can be restored to the original working state during installation.
② Remove the shafts at the two shaft ends with retaining rings.
③Remove the bearing seat compression bolts, screw into the bearing seat removal screw holes with appropriate bolts, and eject the bearing seat from the housing;
④Remove the bearing gland from the bearing seat, and press out the bearing from the bearing seat or push it out with a suitable bolt;
⑤If the bearing is a cylindrical roller bearing with a separable inner and outer sleeve, remove the inner sleeve of the bearing from the shaft and put it into the original bearing outer sleeve;
⑥ After the bearing is disassembled, pay attention to clean the oil stains of all parts. After disassembling the vibrating screen bearing, we need to replace it with a new bearing. Below we will talk about the installation steps of the bearing;
⑦The shaft of the bearing must be properly supported, otherwise the disassembly force is likely to damage the bearing.

The above is the answer on how to disassemble and install the bearing of the vibrating screen. We must follow the correct steps during the disassembly and assembly process, otherwise it may cause internal damage to the bearing, so you need to be careful regardless of disassembly or installation. Hiside Heavy Industries focuses on the manufacture of vibrating screen equipment. The products are high in strength. They are riveted with HUCK bolts, without any welds, and have low power consumption. If you need them, please contact Hiside for detailed inquiries~

Linear vibrating screen is an important equipment in coal preparation, mineral processing, building materials, electric power and chemical industries, and various faults often occur in daily use, which affect the use. For example, vibrating screens often encounter the problem of screen clogging when sieving materials. Today, the editor summarizes the reasons for the blockage of the linear vibrating screen, and solves the problem of blockage through corresponding methods.

Causes of blockage of vibrating screen

The processing capacity of the vibrating screen is positively correlated with the effective opening rate of the screen. The larger the effective opening rate, the better the penetration of the material and the greater the processing capacity of the vibrating screen. In actual production applications, there are two factors that cause the effective opening rate of the vibrating screen to decrease (ie, the screen is blocked): one is the proximity effect, which refers to the formation of particles with the same diameter as the screen being embedded in the mesh. Clogging; there is also the accumulation effect, which is mostly caused by the stickiness of materials or the blocking of the screen caused by accumulation and agglomeration caused by electrostatic mutual adsorption. Therefore, to ensure the throughput, the cleanliness of the screen mesh must be maintained. There are generally two main reasons for the blockage of the vibrating screen: the first material and the second screen. Specifically, the reasons for the blockage of the vibrating screen can be summarized as follows:

1. The density of the material is high, and the selection of the screen is inappropriate;
2. The material to be screened is wet;
3. The material to be screened has static electricity or is easy to stick;
4. The screened materials are lighter;
5. The screen wire has a large diameter and is not easy to blank;
6. The bottom of the screen lacks a net cleaning device (rubber bouncing ball), also known as a clear tennis ball;
7. The woven screen wire is too thick;
8. Spherical particles or materials with multiple contact points to the sieve holes;
9. There are more flaky particles;
10. Thicker screens, such as rubber screens, have unreasonable hole shape design, which does not reach the upper and lower sizes, which causes the particles to get stuck. Because most of the material particles that need to be screened are irregular, the causes of blockage are also diverse.

The solution to the blockage of the vibrating screen

In order to effectively prevent the blockage of the linear vibrating screen, measures should be taken to address the reasons for the blockage of the screen:
1. Analyze and judge the materials to be screened, and select the appropriate screen. If the screen is blocked, the first thing to consider is whether the particle size of the screened material is appropriate, and more importantly, the characteristics of the screened material. If it is viscous, it will easily stick to the screen and cause the screening efficiency to drop. You can properly adjust the amplitude of the vibrating screen to see the effect.
2. In addition, the poor self-cleaning ability of the screen may also cause the mesh to be blocked. At this time, if the vibrating screen permits, a ball support plate can be installed, which uses the principle of a bouncing ball to make the screen Clean up.
3. When sieving materials with fine particles, high moisture content and mud content, the materials are easy to bond, and when the moisture content is greater than 5%, they need to be dried, dehydrated and then screened. If the moisture content is greater than 8%, wet screening is required. .
4. For materials with more flake particles, pay attention to adjusting the crushing method of the materials and the particle size matching of different crushing processes.
5. The vibrating screen is equipped with different numbers of rubber bouncy balls under different meshes.
6. Reasonable adjustment of the tension of the vibrating screen is an effective way to reduce the hole blocking of the screen. The reasonable tension makes the screen and the supporting beam produce a slight secondary vibration, thereby effectively reducing the phenomenon of hole blocking. Occurrence, this can better make the screen work properly. The specific method is: the tension hook is made into a constant tension mechanism, that is, a spring is installed on the tension bolt, so that the phenomenon of blocking the holes of the vibrating screen can be avoided, and the screening effect can be improved, so that the vibrating screen can be screened. higher efficiency.

The linear vibrating screen uses a vibrating motor as the source of vibration, so that 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 generates data through the multi-layer screen. The oversieve and undersieve of various specifications are 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. So do you know what are the sieving methods of the linear vibrating screen? Let me explain it to you next. In the sieving process of materials, the powder sample is passed through a series of standard sieves with different sieve holes, separated into several particle grades, and weighed separately. The particle size distribution expressed as a mass percentage is called the sieve analysis method. That is, sieve analysis, the purpose of which is to determine the particle size composition of the material. There are three common screening methods; these three screening methods can roughly meet the screening requirements of users for different materials. The linear vibrating sieve analysis method can be divided into several types, such as dry sieving, wet sieving, hand sieving, dry and wet mixing, mechanical sieving, air jet sieving, acoustic sieving, panning sieving and self-organizing sieving. And so on, the results of sieve analysis often use frequency distribution and cumulative distribution to express the particle size distribution. There are many methods mentioned above, it depends on which material the user screens, so as to choose the appropriate screening method, but the more commonly used are the first three, let’s take a look together next.

1. Dry sieving method

The so-called dry sieving method, as the name implies, is to calculate the difference between the sum of the sieving balance and the bottom inventory of each sieving meter and the total dry mass m0 of the sample before sieving, as the loss during sieving, and calculate the loss rate. A certain weight of powder sample in the sieve is used to make the fine powder pass through the sieve with the help of mechanical vibration or manual tapping until the sieving is completed. The sieve residue of the powder sample is calculated according to the weight of the residue on the sieve and the weight of the sample. When determining the particle size distribution, dry sieving is generally used.

2. Wet sieve method

Put a certain weight of powder sample in the sieve and wash it for a certain period of time with a suitable dispersion water stream (with a certain water pressure), and then the sieving is complete. According to the weight of the sieve residue and the weight of the sample, the wet sieve method is used to obtain the sieve residue of the powder sample. If the sample contains more water and the particles have strong cohesiveness, wet sieving should be used (the accuracy is higher than that of dry sieving), especially for materials with finer particles. If it is allowed to mix with water, it is best to use wet sieving. . Because the wet method can prevent very fine particles from adhering to the sieve holes and blocking the sieve holes. In addition, the wet method is not affected by the material temperature and atmospheric humidity, and the wet method can also improve the operating conditions. Therefore, the wet method and the thousand method have been listed as the national standard method for the determination of the fineness of cement and raw materials.

3. Combined sieve analysis of wet and dry

Combined dry-wet sieve analysis is to combine the two methods and choose the best. When the material contains more water and mud, and the materials are bonded to each other, the combined dry-wet sieve analysis method should be used, and the results obtained by the sieve analysis are more accurate. . The specific method is to pour the sample into a fine-hole sieve and screen it in a basin containing water. Change the water in the basin every 1 to 2 minutes until the water in the basin is no longer turbid. The material on the sieve is dried and weighed, and the quality of the washed fine mud is calculated based on the difference between the weighed mass and the mass of the original sample.

The three screening methods mentioned above use simple equipment and easy operation, but the screening results are easily affected by the shape of the particles. The size of the particle size distribution is relatively coarse. When the lower limit of the test exceeds a certain value, the screening time will be reduced. Extending, it is easy to block the screen. Therefore, when screening, the particle size of the material should be adjusted as much as possible to avoid the material from blocking the screen.