Precautions for the use of belt conveyors
When we operate the belt conveyor, we must first confirm that the equipment, staff, and conveyed items of the belt conveyor are in a safe and sound state; secondly, check that each operating position is normal and free of foreign objects, and check whether all electrical lines have If it is abnormal, the belt conveyor can only be operated when it is in normal condition; finally, it is necessary to check that the difference between the power supply voltage and the rated voltage of the equipment does not exceed ±5%.
During the operation of the belt conveyor, the following operations must be performed:
1) Turn on the main power switch, check whether the power supply of the device is normal, whether the power supply indicator is on and the power supply indicator is on, when it is normal, proceed to the next step;
2) Turn on the power switch of each circuit to check whether it is normal. Hebei Higris storage shelf manufacturer reminds: Under normal conditions, the equipment does not operate, the running indicator of the belt conveyor is not on, and the power indicator of the inverter and other equipment is on, and the display panel of the inverter displays normally (no fault code is displayed). );
3) Start each electrical equipment in sequence according to the process flow, and start the next electrical equipment when the previous electrical equipment starts normally (the motor or other equipment has reached the normal speed and normal state);
4) During the operation of the belt conveyor, the requirements of the items in the design of the conveyed items must be followed, and the design capacity of the belt conveyor must be observed;
5) It should be noted that the staff should not touch the running parts of the belt conveyor, and non-professionals should not touch the electrical components, control buttons, etc. at will;
6) During the operation of the belt conveyor, the rear stage of the inverter cannot be disconnected. If the maintenance needs are determined, it must be carried out after the inverter is stopped, otherwise the inverter may be damaged;
7) The operation of the belt conveyor stops, press the stop button and wait for the system to stop completely before cutting off the main power supply.
8 protective functions of mining belt conveyors
1) Belt conveyor speed protection
If the conveyor fails, such as the motor burns, the mechanical transmission part is damaged, the belt or chain is broken, the belt slips, etc., the magnetic control switch in the accident sensor SG installed on the passive part of the conveyor cannot be closed or cannot be closed at normal speed. At this time, the control system will act according to the inverse time characteristic and after a certain delay, the speed protection circuit will take effect, so that part of the action will be executed, and the power supply of the motor will be cut off to avoid the expansion of the accident.
2) Belt conveyor temperature protection
When the friction between the roller and the belt of the belt conveyor causes the temperature to exceed the limit, the detection device (transmitter) installed close to the roller will send out an over-temperature signal. The conveyor automatically stops to protect the temperature;
3) Coal level protection under the belt conveyor head
If a conveyor fails to run due to an accident or is blocked by coal gangue or stops due to full coal bunker, coal is piled under the machine head, then the coal level sensor DL at the corresponding position contacts the coal, and the coal level protection circuit will act immediately, so that the The latter conveyor will stop immediately, and the coal will continue to be discharged from the working face at this time, and the tail of the rear conveyor will pile up coal one by one, and the corresponding latter one will be stopped until the loader automatically stops running;
4) Coal level protection of belt conveyor coal bunker
Two high and low coal level electrodes are set in the coal bunker of the belt conveyor. When the coal bunker cannot discharge coal due to no empty vehicles, the coal level will gradually increase. When the coal level rises to the high level electrode, the coal level protection will act from the beginning. The belt conveyor starts, and each conveyor stops in sequence due to the coal pile at the tail;
5) Emergency stop lock of belt conveyor
There is an emergency stop lock switch in the lower right corner of the front of the control box. By rotating the switch left and right, the emergency stop lock can be implemented on the conveyor of this station or the front desk;
6) Belt conveyor deviation protection
If the belt conveyor deviates during operation, the edge of the belt that deviates from the normal running track will pull down the deviation sensing rod installed next to the conveyor and send an alarm signal immediately (the length of the alarm signal can be maintained according to It needs to be pre-set within the range of 3-30s). During the alarm period, if measures can be taken to relieve the deviation in time, the conveyor can continue to operate normally.
7) Stop protection at any point in the middle of the belt conveyor
If the conveyor needs to be stopped at any point along the way, the switch of the corresponding position should be turned to the intermediate stop position, and the belt conveyor will stop immediately; when it needs to be restarted, first reset the switch, and then press the signal switch to send a signal. Can;
8) Mine belt conveyor smoke protection
When the smoke occurs in the roadway due to belt friction and other reasons, the smoke sensor suspended in the roadway will sound an alarm, and after a delay of 3s, the protection circuit will act to cut off the power supply of the motor, which plays a role in smoke protection.
Post time: Apr-27-2022