DH type slip switch selection principle and installation method

DH type slip switch selection principle and installation method

The slip switch is a protection device used to detect the slip between the conveyor belt and the drive roller and to alarm, and can be used to automatically trigger an emergency stop when the belt conveyor slips. There are many types of slip switches, and the working principle and detection methods are also different. For example, according to the detection method, there is a touch wheel type slip switch that directly detects the conveyor belt speed and compares with the set standard speed, and has a slip switch that detects the driven wheel speed and compares with the set standard speed, and simultaneously detects the drum speed. A comparison type of slip switch that is compared with the speed of the conveyor belt; according to the internal working principle, there are magnetoresistive, magnetoelectric, photosensitive, and the like. Many slip switch devices also provide real-time signal display and output for conveyor line speed or drum speed. DH type slip switch DH-I, DH-II, DH-III

Slip switch selection principle and precautions:

The product corresponding to the measurement range should be selected according to the actual moving speed of the belt conveyor being tested. Usually, the belt runs at a line speed of about 2.5--4 m/s during normal operation of the conveyor, and the drum speed is about 50-300 rpm. In addition to the comparative type of slip switch that simultaneously detects the drum speed and the belt speed and compares them, Zui chooses a product that can automatically avoid the low speed state of the belt conveyor when it starts. Since the slipping alarm of the coal conveying belt is actually a low speed alarm, the slipping alarm should be shielded during the start of the conveyor, and the method of delay detection when the conveyor is started can be used (ie, the delay is delayed for a period of time after the start of the conveyor, and the belt conveyor is to be used. After the normal speed is reached, the power supply of the slip switch is turned on, but it is troublesome to implement.

Some products can automatically avoid the low speed state when the conveyor starts. When the conveyor starts, it supplies power to the slip switch. After the slip switch is energized, the belt speed starts to be detected normally after a delay. Try to choose a product that has an actual speed display and can transmit speed signals remotely.

Sliding switch installation method and precautions:

Choose the right installation method for each product type. Non-contact slip switches should be installed as far as possible from strong electromagnetic fields and covered with a metal cover. The setting of the slip alarm value should be set after field measurement. The speed parameters of each belt conveyor are generally different. The actual belt running speed is also affected by the installation mode and structure of the conveyor. Therefore, the action alarm value of the slip switch of each conveyor must be set one by one.