In industrial production, banana style screens, as a kind of high-efficiency screening equipment, is widely used in many fields such as coal, mining, metallurgy and so on. Its unique design of inclined screen surface and multiple vibrations of different frequencies enables materials to be screened efficiently on the screen surface. However, just like any mechanical equipment, banana screen needs careful daily maintenance during long-term operation to ensure its stable operation and efficient work. Once a fault occurs, timely and accurate troubleshooting is crucial to ensure the continuity and stability of production. This article will introduce the daily maintenance of banana style screens points and common troubleshooting skills.
一.The daily maintenance of banana style screens
1.The maintenance of the screen
Regularly check the screen wear
Sieve mesh is a banana style screens directly in contact with the material parts, but also the most easy to wear part. In the daily maintenance, it is necessary to regularly stop the machine to check the wear condition of the screen. Focus on checking the edges of the screen mesh, the discharge end, and the areas where the material concentrates impact. You can use calipers and other tools to measure the aperture of the screen mesh, if you find that some areas of the aperture exceeds the allowable deviation range, you need to consider replacing the screen mesh.
Clear screen clogging
Fine particles and sticky substances in the material can easily cause screen clogging, affecting the screening efficiency. The screen can be cleaned by regular blowback, i.e., after stopping the machine, use compressed air to blow from the back of the screen, and blow down the materials blocked in the screen holes. For viscous materials, you can install ultrasonic screen cleaning device on the screen mesh to prevent screen clogging through high-frequency vibration.
2.Maintenance of vibration components
Check the vibration motor
The vibration motor is the power source of banana style screens vibration, and its operation status directly affects the working effect of banana style screens. Check the temperature of the vibration motor every day, under normal circumstances, the temperature of the vibration motor should not exceed 75 ℃. At the same time, listen to the running sound of the vibration motor, if there is abnormal noise or jamming sound, it may be that the motor bearing is damaged or the eccentric block is loose, and it is necessary to stop the machine in time for maintenance.
Tighten the connecting bolts of vibration parts
Vibrating parts in the long-term vibration process, connecting bolts are easy to loosen. Every week, we should tighten the connecting bolts between the vibrating motor and the screen box, and the connecting bolts between the screen box and the support spring, etc., to prevent the unstable operation of the equipment due to the loose bolts, and even cause safety accidents.
3.Bearing maintenance
Regular lubrication
Bearing is a key rotating part in banana screen, and good lubrication is the key to ensure its normal operation. According to the frequency of use and working environment of the equipment, lubricate the bearings regularly. Generally speaking, for banana style screens in continuous operation, it is necessary to add an appropriate amount of grease to the bearings every 200-300 hours of operation. When adding grease, pay attention to the selection of the appropriate type, generally use high temperature, wear-resistant lithium grease.
Check the bearing clearance
Regularly check the clearance of the bearings, if the clearance is found to be too large, it will lead to abnormal vibration when the equipment is running, affecting the screening effect. You can use a plug ruler and other tools to measure the bearing clearance, if the clearance exceeds the allowable range, you need to replace the bearing in time.
4.Maintenance of transmission components
Check the belt tension
For banana style screens with belt drive, the belt tension should be checked regularly. Too loose a belt will cause the belt to slip, affecting the transmission efficiency of the equipment; too tight a belt will increase the load on the bearings, shortening the service life of the bearings. The tension of the belt can be adjusted by adjusting the position of the motor, and it is generally appropriate to press the belt with a finger, and the belt sinking amount is 10 – 15mm.
Clean the transmission parts
The accumulation of dust and materials on the transmission parts will affect the normal operation of the equipment, and may also lead to increased wear of the belt. Regularly clean the dust and materials on the belt, pulleys, couplings and other transmission parts to keep them clean.
二.The banana style screens common faults and troubleshooting skills
1.Decline in screening efficiency
Failure causes
The screen mesh is clogged or badly worn, resulting in smaller holes or broken mesh, and the material can’t pass through the screen mesh normally.
The excitation force of the vibration motor is insufficient, which may be due to improper adjustment of the eccentric block of the vibration motor, low power supply voltage or failure of the vibration motor itself.
Changes in the nature of the material, such as increased humidity and viscosity of the material, resulting in poor movement of the material on the screen surface.
Uneven feeding, excessive accumulation of materials in some areas, affecting the screening effect.
Elimination methods
Clean or replace the screen mesh in time to ensure that the aperture of the screen mesh meets the requirements.
Check the eccentric block of the vibration motor and adjust it to a suitable angle to increase the excitation force. At the same time, check whether the power supply voltage is normal, if the voltage is too low, you need to adjust the power supply voltage or replace the power cord. If the vibration motor is faulty, it needs to be repaired or replaced in time.
For materials with high humidity and viscosity, pre-drying or adding dispersant can be used to improve the nature of the materials.
Adjust the feeding device to ensure that the material is evenly distributed on the screen surface.
2.Abnormal vibration of equipment
Failure causes
The connecting bolts of the vibrating parts are loose, causing the equipment to shake during operation.
Damaged bearings and too large or too small bearing clearance can cause abnormal vibration of the equipment.
The screen box structure is deformed, probably due to the long-term impact of materials or overloaded operation of the equipment, resulting in a decline in the rigidity of the screen box.
The steering of the two vibration motors is inconsistent, making the equipment subject to unbalanced excitation force.
Elimination method
Tighten the connecting bolts of all vibrating parts to ensure a firm connection.
Check the wear and tear of the bearings, if the bearings are damaged, replace them with new ones in time. When installing the bearings, pay attention to adjust the clearance of the bearings.
Check and repair the screen box, if the screen box structure is deformed seriously, it is necessary to replace the new screen box.
Check the steering of the vibration motor to ensure that the two vibration motors have the same steering. The steering of the motor can be changed by adjusting the wiring of the motor.
3.Excessive equipment noise
Fault causes
Friction between the vibrating parts, such as the connecting parts between the vibrating motor and the screen box are loose, resulting in friction between them.
Bearing lack of oil or damage, bearing in the case of lack of oil or damage, will produce abnormal noise.
The fixation between the screen mesh and the screen box is not firm, and the screen mesh collides with the screen box when the material moves on the screen surface.
The foundation of the equipment is not firm, and the equipment generates noise due to the vibration of the foundation during operation.
Elimination method
Check the connecting parts between the vibrating parts, tighten the loose parts, and add lubricant to the friction parts.
Lubricate the bearings or replace the damaged ones.
Check the fixing condition of the screen mesh and the screen box, tighten the loose bolts, and add buffer pads between the screen mesh and the screen box.
Reinforce the foundation of the equipment to ensure the stability of the foundation.
4.Material running coarse
Failure causes
The screen mesh is broken, resulting in large particles of material through the broken screen mesh mixed into the product under the screen.
Sieve mesh tension is not enough, the sieve mesh shaking under the impact of the material, so that large particles have the opportunity to pass through the sieve mesh.
Screening parameters are set unreasonably, such as screen surface inclination angle is too large, vibration frequency is too high or too low, will affect the screening effect.
Remedy
Replace the broken screen mesh in time to ensure that the quality and installation of the screen mesh meet the requirements.
Adjust the tension of the screen mesh to keep the screen mesh taut during the working process.
According to the nature of the material and screening requirements, reasonably adjust the screening parameters, such as screen inclination angle, vibration frequency, etc..
The routine maintenance and troubleshooting of banana style screens is the key to guarantee its efficient and stable operation. Through regular maintenance, timely detection and resolution of potential problems can effectively extend the service life of the banana style screens and improve production efficiency. At the same time, when the equipment fails, it can accurately and quickly determine the cause of the failure and take effective troubleshooting measures, which can minimise equipment downtime and reduce production losses. In actual operation, operators and maintenance personnel should operate in strict accordance with the operating procedures and maintenance manual of the equipment, and constantly accumulate experience to improve the maintenance and management level of the equipment. Only in this way can we give full play to the role of banana style screens in industrial production and create greater economic benefits for the enterprise.
