ZJK127/36 type of mining flameproof and intrinsically safe type conveyor belt tension control device 
 National coal safety regulations related to improving the protection of underground belt conveyor design, the design of the device using a single-chip processing, so advanced, reliable, easy to operate, energy-saving devices and similar products, compared have a greater degree of improvement. 
 Characteristics of the device with explosive gas and coal dust in mines, used to monitor and control the tension of the belt conveyor. Has the following characteristics: 
 1) Selection of the circuit 32 with the CAN bus, the ARM-7 core CPU for data processing and control, greatly improving the product performance and reliability; 
 2) display with 128 * 64 blue-character dot matrix display, with a good man-machine interface; 
 3) All the function settings (such as parameter settings, on-site calibration) and data information using Chinese characters and a graphical interface to complete; 
 4) high-performance open CAN bus data sharing data with other devices, such as data exchange with the host computer or with CAN belt conveyor protection device bus. 
 5) the CAN bus in the 5000 baud rate, the maximum transmission distance of 10km 
 6) The control panel uses high-performance switching power supply with low power consumption, wide range, power range up to 12 ~ 30V. 
 Electrical parameters 
 Electrical parameters 
 a rated input voltage: AC127V/0.2A or 36V/0.5A; 
 b, the maximum allowable voltage: AC140V or 40V; 
 c, the safety output open-circuit voltage: DC12V; 
 d intrinsically safe working current ≤ 95mA; (DC); 
 e, intrinsically safe output short-circuit current: DC400mA; 
 f, overcurrent protection setting value 1.2A 
 g, and the sensor voltage: DC 8.5V; 
 h, the sensor output voltage signal: DC 0-20mV 
 ≤ 1000 m connecting cable length, cable distributed capacitance <0.1μf/km inductance of the cable distribution <1mH/km; 
 J, relay contacts limit: voltage ≤ 250V (AC), current ≤ 0.5A tension sensor connections over 10 meters. 
 Function and protection features: 
 1, the tension of the normal figure of testing, calibration and parameter setting 
 2, the tension value is optional Kg, Tn,% calibration. 
 3, the tension value is less than the set value, the device will control the motor forward to increase the tension value, and vice versa to reduce the tension value to achieve the tension protective effect. 
 4, the data output of the device features two one kind of 200 ~ 1000Hz, corresponding to a tension of 0 ~ 100kN (set units), another fieldbus output (CAN bus), the frequency of the output signal can access sub-station or other collection frequency signal devices, fieldbus output access to other intelligent and with a CAN bus devices to complete the data sharing. 
 Structure 
 Co., Ltd. Jining East Asian mining production conveyor belt tension control device consists of a conveyor belt tension control device host and belt tension control device tension sensor, a host of explosion-proof chamber and the shell of the security, internal intrinsically safe implementation of power, the security control unit, the operating unit. 
 Power execution units for flameproof and intrinsically safe type, the shape of a rectangle, the left end of the explosion-proof cavity 36V (127V) power to introduce and relay control contacts export; the top right of for 12V/1A this security power leads and control signals to the introduction of export; consists of the power supply board and transformer. 
 Intrinsically safe control unit: intrinsically safe enclosure on both sides of the two outlet ports, used to install the tension sensor. 
 Flameproof chamber brought 12V intrinsically safe power supply switching power supplies, DC-DC isolated power supply into a 5V, 3.3V, 1.8V, 12V for the CPU and peripheral devices. 3D1 sensors (strain Bridge) to provide precision excitation power, 3U1 is responsible for signal amplification and fed into the CPU internal AD acquisition. Data after processing by the CPU, according to the set value, the complete output control functions, control output is the completion of the two relays to control the motor forward and reverse so as to achieve the purpose of the tension increases and decreases. 
 LCD1 128 * 64 character dot matrix LCD screen with four buttons used to complete the man-machine dialogue. 
 The 24CW02 EEPROM used to store configuration information. 
 The 82C250 responsible for the CPU internal CAN controller data sent to the data bus. 
 ZJK127/36 type of mining flameproof and intrinsically safe type conveyor belt tension control device