Summary of 13 kinds of faults that are easy to appear on the scraper conveyor

Summary of 13 kinds of faults that are easy to appear on the scraper conveyor

The scraper conveyor has the advantages of firm structure, convenient installation, reverse operation, feeding or unloading at any point, and the advantages of self-receiving and conveying, which has become an important transportation equipment in coal mine production. However, due to the harsh working environment, the scraper conveyor is prone to fatigue, wear, breakage and other faults, which affect production. This paper summarizes several common faults and countermeasures, and provides a basis for the daily maintenance and maintenance of technicians.

1, motor failure

  • 1.1 fever
  • Analysis of the cause: Most of the heat is related to poor heat dissipation. For example, the fan sucks up more dust, overloads the operation, the bearing lacks oil or damage, the coaxiality does not meet the requirements, the vibration is large, and the fuse (slice) is larger.

    Countermeasures: Clean the dust of the motor fan suction port, eliminate the overload factor, replace the damaged bearing, adjust the coaxiality, tighten the anchor bolt, and fuse (chip) to meet the motor parameters.

  • 1.2 abnormal sound
  • Analysis of the cause: single-phase operation; bearing damage; load is too heavy or the chip and the top will crush the conveyor.

    Countermeasures: Check the phase line to eliminate single-phase hazards; replace damaged bearings; eliminate overload factors.

  • 1.3 Motor start abnormal
  • Reason analysis: overload; running parts have jamming phenomenon; coal mining face is uneven; supply voltage is low; transformer capacity is small; delay between head and tail motor is too long, so that single machine drag; motor failure .

    Countermeasures: Eliminate the overload factor; remove the jamming material; level the coal mining face; adjust the power supply voltage; replace the transformer with the appropriate capacity; re-set the delay between the motors; replace the motor.


2, the speed of the reducer oil is high

Analysis of the cause: the content of foreign matter in the oil is too high, more than 2%; the metal abrasive exceeds 0.55; the water content in the oil exceeds 2%; the oil quantity is insufficient; the heat dissipation effect of the reducer is not good (such as more floating coal); Gear damage, etc.

Response: Oil change or oil change after more than 200 hours of operation, first clean the tank, then add the right amount of lubricant. After the oil quality expires, it should be replaced regularly; clean the floating coal around the reducer and the top, improve the ventilation environment to ensure good heat dissipation; eliminate the overload factor; replace the damaged gear, and ensure that the gear clearance meets the assembly requirements and technical requirements.


3, hydraulic coupler failure

  • 3.1 slipping
  • Analysis of the cause: the coupler lacks oil; overload (too much coal in the chute); the scraper chain is stuck.

    Response: Supplement the oil for the coupler; eliminate overload factors; eliminate chain jams.

  • 3.2 fever
  • Analysis of the cause: the ventilation holes are not smooth; the oil quantity is insufficient; the overload; the start is frequent.

    Countermeasures: Ventilation holes are cleared; oil for the coupler is supplemented; overload factor is eliminated; frequent start-up is avoided.

  • 3.3 oil spill or fuel injection
  • Analysis of the cause: Most of the oil leakage is due to damage to the seal or gasket; the oil plug is loose; most of the fuel injection is melted by the fusible plug.

    Remedy: Check the fusible plug and oil plug. If it is normal, disassemble the coupler and replace the damaged seal. If the fusible plug is damaged, replace the fusible plug and eliminate the overload factor or chain jam factor.


4, scraper conveyor insurance pin break

Analysis of the cause: Due to too much material, the overload is caused, causing the insurance pin to break. The debris is brought back into the empty chain, causing the chain to be stuck, and the resistance is too large, causing the insurance pin to break.

Precautionary measures: Adjust the scraper chain before starting the machine, and the tightness should be moderate. Clean the material at the head and tail. At the same time, it is necessary to clean up foreign bodies (meteorites, wood, sundries, etc.) and load coal in an appropriate amount.

Response: If the remaining length of the broken pin exceeds 20mm, the original pin can be inserted into the re-use. If the remaining length is less than 20mm, the insurance pin needs to be replaced. If the new pin after the replacement is broken again, it is necessary to carefully analyze the site, find the root cause, and completely solve it.