Operational principle：

  A vibrating feeder is a material conveying equipment that can uniformly, regularly, and continuously transport block and granular materials from the storage bin to the receiving device. Widely used in crushing and screening equipment in industries such as metallurgy, coal mining, mineral processing, building materials, chemical engineering, and abrasives. For example, in the sand and gravel production line, it can continuously and uniformly feed the crushing machinery and perform coarse screening on the materials. The working principle of a vibrating feeder is mainly based on the centrifugal force generated by the rotation of the eccentric block in the vibrator, which forces the movable parts such as the screen box and vibrator to move in a forced continuous circular or approximate circular motion, thereby achieving material transportation.

Main features:

  The main characteristics of a vibrating feeder are: simple structure, stable vibration, uniform feeding, and good continuous performance; The excitation force is adjustable, and the adjustment performance is good. The feeding amount can be uniformly adjusted, and the operation is convenient; Small amplitude, high frequency, low noise, low power consumption, high production capacity, and no material flushing phenomenon; If a closed body is used, it can prevent dust pollution and other characteristics. The feeding capacity adjustment of electromagnetic vibration feeder is usually achieved by adjusting the amplitude and the size of the discharge gate opening.

Precautions for on-site installation：

    • Installation of equipment body：The exciter of the electromagnetic vibration feeder is suspended with flower basket screws at the lower rear of the tank. When installing the electromagnetic vibration feeder on site, the following precautions should be taken.

1. When installing the tank, tilt it down by 10 °. However, for viscous materials or materials with high moisture content, the tilt angle can be increased to 15 ° to prevent material self flow.

2. Electromagnetic vibration feeders are very sensitive to loads, affecting equipment output and causing equipment damage. When installing, try to reduce the pressure acting on the feeder as much as possible, such as adding inclined plates at the discharge port to reduce the direct vertical impact of materials on the tank.

3. After on-site installation of the equipment, open the inspection cover of the shell, check and adjust the assembly air gap between the iron cores to the standard value of 2 ± 0.1mm, while keeping the working surface parallel (with a levelness less than 0.15mm); Confirm that there are no foreign objects between the assembly air gaps, etc; All fastening bolts must use anti loosening washers; The equipment body should be sealed according to the designed protection level to prevent dust and moisture from entering and causing malfunctions.

   • Installation of supporting electrical control box：The electric control box matched with the electromagnetic vibration feeder is generally installed near the main equipment, and the impact of on-site dust and other environments on the stability of the electric control box should be considered. This not only facilitates on-site operation, timely adjustment of excitation force, but also facilitates dust and explosion prevention in the production site. When installing the electrical control box, the following precautions should be taken: first, check whether the electrical control box of the equipment meets the protection level requirements to avoid the control box from not working properly due to dust or environmental humidity after driving; Connect according to the electrical schematic diagram and check if the wiring inside the control box is loose or detached; Check the thyristor to ensure good heat dissipation; Check if the excitation head and control box are grounded according to the electrical equipment installation regulations.

Precautions for on-site debugging：
  After the on-site installation of the electromagnetic vibration feeder, it is necessary to conduct no-load debugging and feeding debugging successively to ensure that the electromagnetic vibration feeder can be put into formal operation normally after the project construction is completed. The precautions for on-site debugging of electromagnetic vibration feeder are summarized as follows.
1、No load debugging
Before the no-load debugging of the electromagnetic vibration feeder, it is necessary to double check and confirm that the air gap is within the standard range, and adjust the elastic system on site by tightening the plate spring and pressing the bolt.
After the electromagnetic vibration feeder starts with no load, adjust the potentiometer knob to gradually increase the current. At this time, if the current is less than or equal to the rated value and the amplitude is small, loosen the jacking bolts on both sides of the plate spring set to increase the amplitude. If the amplitude is smaller and the current is relatively larger, continue to tighten the plate spring compression bolts; The adjustment of the air gap and the tuning of the elastic system should complement each other.
2、Feeding debugging
  After the no-load debugging of the electromagnetic vibration feeder is completed, feeding debugging should also be carried out. After feeding, start the electromagnetic vibration feeder, observe the operation of the equipment, and make timely adjustments. The main precautions for this operation are as follows.

① Adjust the bar at the inlet of the vibrating feeder tank based on the actual flow characteristics of the material. If there are too many bars, large blocks in the silo can easily cause blockage, while if there are too few bars, it can easily lead to unstable output of the tank. It is recommended that the bar spacing be 1.5 times the maximum particle size of the material.
② For materials with high humidity or viscosity, the output may be unstable. It is necessary to lined the bottom of the tank with polymer polyethylene sheets to prevent coal accumulation. At the same time, adjustable baffles should be made on site at the outlet of the tank to control the instantaneous maximum flow rate of coal and prevent downstream belt conveyors from deviating or scattering.
③ If the current changes significantly, it may cause loosening of the top bolt, breakage of the plate spring, and changes in the air gap; If there is weak vibration and the amplitude of the potentiometer is almost unchanged or the current is too high, it is necessary to check whether the thyristor is broken down and whether there are foreign objects in the air gap.
④ When there is a sudden increase in material feeding, the equipment current will also suddenly increase. It is necessary to adjust and control the maximum flow rate, or clean the material in the tank after each equipment shutdown to avoid overload starting.
⑤ There is loud machine noise, irregular amplitude after adjusting the potentiometer, and violent impact sound. It is necessary to check whether the plate spring is broken, whether the connecting bolts between the vibrator and the slot are loose, whether the air gap is normal, and whether the iron core is wired properly.

  As a feeding equipment in the material conveying system of modern enterprise automation production, electromagnetic vibration feeder is crucial for standardized construction during on-site installation and no-load and feeding debugging before the formal operation of the production system. Only in this way can its advantages be fully utilized after the formal operation of the production system, ensuring the stable operation of the feeding system.