Vibrating screen

Vibrating screen
  • 【Feed particle size】: ≤ 200-≤ 300mm
  • 【Production capacity】: 10-600t / h
  • 【Application】: mining, coal, smelting, building materials, refractories, light industry, chemical and other industries.
  • 【Product Description】: SBM production of linear vibrating screen (straight screen) is a new type of high efficiency screening equipment, widely used in mining, coal, smelting, building materials, refractories, light industry, chemical and other industries. Linear vibrating screen (linear screen) is stable and reliable, low consumption, low noise, long life, stable vibration, high screening efficiency.
Classification of vibrating screens

Vibration screening equipment can be divided into: mining vibrating screen, light fine vibrating screen, experimental vibrating screen Mine vibrating screen can be divided into: efficient heavy sieve, self-center vibrating screen, oval vibrating screen, dehydration sieve, Round sieve, banana sieve, linear vibrating screen and other light fine vibrating screen can be divided into: rotary sieve, linear sieve, straight sieve, ultrasonic shaker, filter screen can refer to the vibrating screen series experimental vibrating screen: Boring-type vibrating screen machine, the standard test sieve, electric vibrating machine, please refer to the experimental equipment

According to the vibrating screen material trajectory can be divided into: linear motion trajectory points: linear vibrating screen (material in the screen surface to do forward linear motion) by circular motion trajectory points: round sieve (material on the screen surface to do round Shape movement) structure and advantages

Use range of vibrating screens

It is widely used in plastics, abrasive, chemical, pharmaceutical, metallurgical building materials, grain, carbon, fertilizer and other industries.

The working principle of vibrating screen

Vibrating screen work, the two motor synchronous reverse rotation so that the exciter to produce reverse exciting force, forcing the sieve to drive the screen to do vertical movement, so that the material on the exciting force and cyclical forward throw a range, Thus completing the material screening operation. Suitable for quarry screening sand and gravel material, but also for coal preparation, mineral processing, building materials, power and chemical industries for product classification. The working part of the vibrating screen is fixed and the material is sieved along the working surface. Fixed grid sieves are more widely used in concentrates, and are generally used for pre-screening before shredding or shredding. It is simple in structure and easy to manufacture. Do not consume power, you can directly unload the ore on the screen surface. The main drawback is the low productivity, low screening efficiency, generally only 50-60%. Vibrating screen work surface is a horizontal arrangement of a root rolling axis, the axis of a plate, fine material from the roller or the gap between the plate through. The bulk material is driven by the roller to the one end and discharged from the end. Concentrators often use this sieve. The working part of the vibrating screen is cylindrical, the whole screen is rotated around the axis of the cylinder body, and the axis is not inclined in the general situation. The material is fed from one end of the cylinder and the fine grade material passes through the sieve of the cylindrical working surface and the coarse material is discharged from the other end of the cylinder. The speed of the cylinder screen is very low, work smoothly, the power balance is good. But its sieve is easy to plug, the screening efficiency is low, the working area is small, the productivity is low. The concentrator rarely uses it for screening equipment. The vibrating screen body is a plane swings or vibrations. According to its plane motion trajectory is divided into linear motion, circular motion, elliptical motion and complex movement. Shaking sieve and shaker are of this category. When the vibrating screen is working, the two motors are placed in reverse direction to cause the exciter to generate the reverse exciting force, forcing the sieve body to drive the screen to do the longitudinal movement, so that the material on the excitement and cyclical forward throw a range, Thus completing the material screening operation. The shaking sieve is a crank link mechanism as a transmission part. The motor through the belt and pulley drive eccentric shaft rotation, by connecting rod so that the body in a certain direction for reciprocating motion.

The direction of movement of the body perpendicular to the strut or suspension rod center line, due to the body of the swing movement, so that the material on the screen surface to a certain speed to the discharge end of the material at the same time be sifted. The shaking sieve has a higher productivity and sieving efficiency than the above sieves. The disadvantage is poor power balance. Now the concentrator rarely use it, and the structure is more reasonable to replace the shaker.

Noise Source of Noise Sieve and Noise Reduction Measures

At present, large-scale screening tool is mainly based on vibrating screen, but in the course of the use of special noise, then the noise come from? Vibrating screen As the name suggests is through the vibration of the sieving work, this feature determines the normal work must be achieved through the vibration to achieve screening, but the vibration is the root cause of noise, the main noise source is derived from the side Plate, sieve plate, shock absorber bearings and vibrating sieve used in the work of the steel spring and other devices generated by the vibration, which is the sound of high sound sieve, the sound source and more complex reasons.

Vibrating screen noise reduction can be used as follows:
  • 1, the punching steel plate replaced with a small elastic modulus, low impact noise of the polyurethane sieve or rubber sieve plate;
  • 2, with rubber springs instead of steel springs to reduce the impact; in the exciter in vitro soft
  • 3, fastening all components on the vibrating screen, in particular, need to frequently replace the sieve, to avoid the individual parts of the loose and additional vibration;
  • 4, in the vibrating screen bearing between the inner jacket to be damped, the bearing rolling body can be made into a hollow rolling body or in the hollow rolling body to join the damping material, which can reduce the bearing vibration and reduce the bearing noise;
  • 5, in the sieve box side plate, feeding feed port, discharge port and access to the chassis plate affixed to the rubber plate, which can effectively inhibit the vibrating screen side of the high-frequency vibration, reduce radiation noise;
  • 6, the use of flexible The spoke gear is used to replace the steel gear, and the rubber elastic body is used to transmit the torque on the spoke plate to absorb the vibrations caused by the gears.
installation of vibrating screens:
  • 1, before the machine is installed, first check the packing parts in accordance with the packing parts are complete and damaged, which vibrator from the factory date, if more than six months, must be replaced with clean lubricants.
  • 2, the installation of equipment should have sufficient rigidity and strength to support the vibrating screen of all dynamic and static load.
  • 3, to ensure that the screen box and hopper, chute and other non-moving parts should be maintained between the minimum 75mm gap.
  • 4, the installation, the screen box to the level of four corners.
Adjustment and commissioning of vibrating screens:
  • 1, the spring must be in a vertical state, the spring on the bearing and spring contact surface must be horizontal, adjust the bolt with the bolt on the spring fixed on the screen box trunnion, and then welded into one.
  • 2, vibrating screen drive direction positioning, standing on the feed side, facing the material flow direction to observe the motor position, get left or right drive. Users do not have special requirements when the manufacturer is driven by left drive.
  • 3, no-load test run time of not less than 2 hours, no-load test run qualified, can be put into the load test run, the load test can be carried out according to the requirements of the test.
  • 4, before the test must be hand (or other methods) to turn the exciter. Rotation should be flexible, no jamming phenomenon, before the official start of the machine.