When the belt conveyor (telescopic belt conveyor) transports materials, in order to prevent accidents, some protective devices are set inside the machine to maintain the transportation. Belt conveyor protection is divided into deflection protection, belt fracture slip. Then pull the stop line tightly deflect the deflected belt. Sliding protection generally uses travel switch. The principle of the range switch is to rely on the belt to touch the electrical switch. When parking, this kind of electrical protection device is relatively simple, the cost is low. At present, it has been widely used in factories. The rope tightening switch relies on the electrical switch, a thin steel wire rope is installed at the belt side. In case of a serious accident, you need to pull the wire rope to stop the car. This is the same principle as the cord switch used in our household lamps.

Belt conveyor is widely used in various industries, such as household appliances, machinery, tobacco, printing food, assembly, testing, debugging, packaging transportation of various objects. According to the technical requirements, various control modes of belt conveyor line can be selected, such as beat operation, variable speed operation continuous operation. Belt conveyor can also use straight line, curve slope according to local conditions.

The protection system of belt conveyor is mainly composed of speed sensor, which is used as speed sensor to detect the speed of belt conveyor. If the running speed of the driven pulley is 50-70% VA (rated speed), when the speed of the belt is less than equal to 50% VA greater than equal to 110% VA, the delay is (5-10) seconds, the controller can automatically cut off the power supply of the belt conveyor, stop the belt conveyor, realize speed protection. Deviation sensor: its normal state has been disconnected it has been closed during operation. It instinctively cuts off the power supply of the belt conveyor automatically stops the belt conveyor.

Coal pile sensor: connected by two electrodes, coal level reacts with protection device through wire. Monitor the coal level in the coal bunker funnel. When the coal is full the machine head is stacked, the belt conveyor can automatically cut off. Power supply to achieve comprehensive coal protection. Emergency stop protection: the control panel belt of each controller are equipped with pull wire emergency stop switch for fault emergency stop protection. Overheat protection: temperature sensors are used to monitor the bearing temperature ambient temperature of belt conveyors other components. When the temperature of the monitoring point exceeds the set value, the controller can automatically cut off the power supply of the belt conveyor to achieve overheating protection. Start the sprinkler to cool down. Smoke sensor: when the smoke sensor is used to detect whether there is smoke in the belt coal, the controller will implement the parking protection start the water spray dust suppression device. Tear sensor: when the belt appears longitudinal tear fault, the coal falls on the sensor, the sensor works, the controller cuts off the power supply of the belt conveyor, stops the belt conveyor.