The vibrating screen is a screening equipment capable of grading, dehydration, desliming, de-intermediation, and sorting. The vibration of the sieve body is used to loosen, stratify, and pass through the sieve to achieve the purpose of material separation. The screening effect of the vibrating screen not only has a great impact on the value of the product, but also has a direct impact on the efficiency of the next operation.

In daily production, vibrating screens will encounter various problems, such as bearing heating, parts wear, breakage, and screen hole blockage, wear, etc. These are the main reasons that affect the screening efficiency. Therefore, in order to improve efficiency, Solving these common problems is key to providing security for follow-up operations.

Vibrating screen bearing heating

In general, during the test run and normal operation of the vibrating screen, the bearing temperature should be kept in the range of 35~60°C. If the temperature exceeds this value, cooling treatment is required. The main reasons for the high bearing temperature are as follows:

1. The bearing radial clearance is too small

The radial clearance of the vibrating screen bearing is too small, which will cause the bearing to wear and heat up, mainly because the bearing carries a large load, the frequency is high, and the load is constantly changing.
Solution: It is recommended that the bearing adopt large clearance. If it is a bearing with ordinary clearance, the outer ring of the bearing can be ground to form a large clearance.

2. The bearing cover is too tight

There needs to be a certain gap between the gland of the vibrating screen and the outer ring of the bearing, so as to ensure the normal heat dissipation and certain axial movement of the bearing.
Solution: If the top of the bearing gland is too tight, it can be adjusted through the gasket between the end cover and the bearing seat, and it can be adjusted to a suitable gap.

3. Too much or too little bearing oil, oil pollution or inconsistent oil quality

The lubrication system can ensure the normal operation of the vibrating screen bearings, prevent the intrusion of foreign matter and sealing effect, and can also eliminate frictional heat, reduce friction and wear, and prevent the bearing from overheating. quality.

Solution: According to the requirements of the equipment, oil should be added to the bearing box regularly to avoid too much or too little oil. If there is a problem with the oil quality, it is necessary to clean, replace the oil and seal in time.

Vibrating screen parts are worn or broken

Some parts of the vibrating screen may be severely worn or even broken after long-term operation. The common worn and broken parts include spring springs, bearings, pipe beams, beams and screen frames.

1. The spring is worn or broken

The spring should be an important part of the vibrating screen for shock absorption and noise reduction. If the spring is worn or broken, it will not only generate a lot of noise, but also cause disorder on the screen.

Solution: The spring should be replaced in time to prevent production accidents.

2. Bearing wear or fracture

The bearing is an important part of the vibrating screen of the vibrating screen. There are many reasons for the bearing to wear or break. Once the wear is serious or broken, it can only be replaced by parking.

3. Pipe beam fracture

Generally, during dehydration or de-mediation, the water scouring force is relatively strong, and water will leak from the gap between the screens to scour the pipe beam. If the wall of the pipe beam is too thin, the pipe beam is easy to break at the scoured place.

Solution: It is suggested that you can prepare with both hands. First, when selecting a vibrating screen, you should choose the same type of thick-walled pipe beam, or a larger model of pipe beam to increase the thickness of the pipe beam wall; The joints of each sieve plate of the screen are provided with horizontal and vertical beading to reduce water leakage from the gap.

Note: If the fracture of the pipe beam is not serious, in order not to affect the production, repair welding can be carried out on the pipe beam to continue to use. When repairing welding, the weld seam must follow the longitudinal direction of the pipe beam, and absolutely no transverse weld seam is allowed, otherwise the pipe beam will Easier to break from transverse welds.

4. Broken beam

The fracture of the crossbeam is mostly due to the long working time at the critical frequency, the looseness of a large number of high-strength bolts fastening the side plate, which seriously deforms the spring, and the difference in height between the left and right causes the crossbeam to break; it may also be that the weight error of the eccentric block is too large, causing Structural damage caused the beam to break.

Solution: Stop to replace the damaged structural parts and beams and tighten the bolts; adjust the quality of the eccentric block.

5. The screen frame is broken

The fracture of the screen frame is generally caused by the shaking of the vibrating screen frame of the vibrating screen.

Solution: The side plate can be thickened, or the side plate near the exciter can be partially thickened (or add additional plates) to enhance the rigidity of the entire screen frame.

Vibrating screen holes are clogged or worn

1. The sieve hole is blocked

Generally, the clogging of the vibrating screen hole is mostly due to the high mud content and water content in the incoming material, which makes the material stick to the sieve hole and block the sieve hole.

Solution: Firstly, clean the sieve holes, and then properly adjust the water spray volume and the inclination angle of the sieve surface.

2. Screen wear

When the vibrating screen is used for a long time, the screen holes will be severely worn and the screening effect will be affected.

Solution: If the wear of the screen hole is not serious, it can be repaired in time. If the wear of the screen hole is serious, it can be considered to replace the screen.

The above are the common problems of vibrating screens, and they are also the key problems that seriously affect the screening operation. When solving these problems, in addition to finding and solving problems in time, attention should also be paid to the purchase and selection of vibrating screens, so as to effectively improve the operating efficiency of the vibrating screen.