- Conveyor safety protection device is necessary.
1.1 The anti-skid protection, coal pile protection and anti-deviation devices of the driving drum must be installed.
1.2 Temperature protection, smoke protection and automatic sprinkler should be installed. The ground belt conveyor may not be equipped with a smoke protection device.
1.3 The belt conveyor installed in the main transportation roadway must also be equipped with a conveyor belt tension reduction protection device.
1.4 The belt conveyor used in the inclined shaft must be equipped with an anti-reverse device and a braking device at the same time when it is transported up; and a braking device must be installed when it is transported down.
1.5 Belt conveyors must be equipped with emergency stop protection devices along the line.
- Anti-skid protection (speed)
2.1 Protection characteristics
When the speed of the conveyor belt is less than or greater than the rated speed (slipping), the anti-skid protection will immediately alarm and stop the operation of the belt conveyor.
Note: The anti-skid protection device should not have protective action for the speed change during normal start and stop of the belt conveyor.
2.2 Installation position and test method of roller type anti-skid protection
(1) Installation position: The roller speed sensor is installed on the upper surface of the lower tape or the lower surface of the upper tape, so that the tape and the roller maintain sufficient driving friction.
(2) Test method: lift or turn it away from the belt surface, the belt conveyor should be able to automatically stop and alarm. (Once a day)
(3) For conveyor rollers, it is better to use high wear resistant anti slip pulley lagging.
2.3. Installation position and test method of inductive anti-skid protection device
(1) Installation position: The magnet is installed on the side of the reversing drum, and the distance from the side of the drum should not exceed 50mm. The speed sensor is installed on the large frame corresponding to the magnet, and it is strictly prohibited to use iron wire and other items to be tied and fixed.
(2) Test method: rotate the sensor direction or keep the sensor away from the drum.
Read More: High Wear Resistant Anti Slip Pulley Lagging Manufaturer
- Coal stack protection
3.1 Protection characteristics
The coal stacking protection continuously monitors that the position of the coal exceeds the predetermined value within 2s, and should alarm and stop the operation of the belt conveyor. By changing the declination or action of the sensor, a coal pile protection device for protection is formed.
3.2
(2) The coal pile protection sensor at the coal bunker should be installed horizontally below 200mm below the glue under the machine head, and its plane position should be within the coal bunker mouth. Coal pile protection at the coal bunker mouth should be electrode type protection.
Test method: touch the two bare wires to the wet place at the same time, and stop the machine, it is qualified.
- Deviation protection
4.1 The function of the anti-deviation protection device is to automatically stop the conveyor when the conveyor belt deviates seriously.
A set of anti-deviation protection devices that can automatically stop the conveyor when the conveyor belt deviates seriously should be installed at the head and tail of the conveyor. The anti-deviation rolling guide rod is installed in the range of 50-100mm from the outer edge of the roller on the tape, and the height is suitable.
Test method: artificially push the guide rod of the deviation sensor to make the limit switch act, and it can automatically stop and alarm, which is normal. (Once a day)
4.2 Installation specifications and requirements
The deviation protection of the belt conveyor should be used in pairs, 10-15 meters away from the machine head, when the belt conveyor has a slope change, a pair should be installed at the position of the change; the deviation protection should be fixed with a special bracket On the frame or longitudinal beam of the belt conveyor, in order to protect the deviation of the belt on the belt conveyor.
- Smoke protection
5.1 Protection characteristics
Within 2s, when the smoke concentration reaches 1.5%, the smoke protection should alarm, stop the operation of the belt conveyor, and start the automatic beverage device at the same time to cool down.
Sensors are regularly replaced every two weeks. According to the management scope, the well-lifting is handed over to the electrical and mechanical department and comprehensive machinery office for measurement and replacement. The belt of the main coal flow system managed by the belt work area is measured and replaced by itself, and records must be kept.
5.2 Installation specifications and requirements
The smoke protection of the belt conveyor should be installed directly above the conveyor 5-15m from the leeward side of the driving roller of the belt conveyor, and the smoke sensor should be hung vertically, no more than 300mm from the top plate
- Over-temperature automatic sprinkler protection
6.1 Protection characteristics
At the temperature measurement point, when the temperature exceeds the specified limit, the over-temperature automatic sprinkler should alarm, and at the same time, the automatic sprinkler device can be activated to spray water to cool down.
6.2 Installation specifications and requirements
The thermocouple type over-temperature water sprinkler sensor should be fixed on the main drive drum seat (bearing seat); when using an infrared sensor, the sensor emission hole should be detected at the main drive roller, and the distance between the sensor and the main drive drum is 300mm-500mm.
Test method: Use hot water above 80°C to scald the sensor at the source once a month. When the temperature reaches the specified requirements, the solenoid valve action pipeline starts to spray water, which is normal; the sensor is replaced regularly every quarter.
- Emergency stop device along the belt conveyor
An emergency stop switch shall be installed every 100m in the tunnel of the belt conveyor. Emergency stop switches shall be provided at the loading point, pedestrian crossing, the nose and the tail of the machine, and the switch signal shall be connected to the control system of the belt conveyor. The emergency stop switch should be connected with a pull rope with appropriate pre-tension, and the pull rope should not be crossed and hung with the cable.
When using the pull wire emergency stop device, the emergency stop device should be installed on the pedestrian side of the belt conveyor. Use a specially machined fixing plate and fix the emergency stop sensor on the H frame of the belt conveyor with bolts.
All devices of emergency stop protection devices along the line shall be fully tested within one week.
- Tension drop protection
When the tension of the conveyor belt drops, the tension trolley moves and touches the tension drop protection switch (installed on the walking track), and the travel switch controls the main control system of the conveyor to stop running and alarm. After the belt is tensioned, the distance between the fixed position of the travel switch and the tension winch shall not be greater than 500mm.
Test method: When the conveyor is running or stopped, manually touch the limit switch, it can automatically stop and alarm as normal.
- Temperature protection
The temperature guard sensor must be installed where the drive roller is separated from the tape, or inside the drive roller.
Test method: Use hot water above 80°C to scald the sensor at the source once a month. When the temperature reaches the specified requirements, it is normal for the solenoid valve action pipeline to start spraying water; the sensor is replaced regularly every quarter.
- Anti-reverse device
10.1 Protection characteristics
When the power supply of the belt conveyor is cut off, the braking device should be able to brake the operation of the belt conveyor roller in time to prevent the conveyor from sliding down and causing a reverse speed accident.
10.2 Installation specifications and requirements
The inclination angle of the top-carrying belt conveyor in use exceeds 10. A reducer backstop or other effective anti-reverse device must be installed.
If you have any questions during use or installation, please contact BAI-OTT Coveyor Belt Accessories Company.