Inclined lane anti-sports car device principle
1 device composition and working principle
The double-remaining normally closed inclined shaft anti-sports car device is mainly composed of a controller realized by PLC, a decelerating energy absorber, an asynchronous actuator, a parking net door, and five sensors for measuring speed and position, as shown in FIG. :
Figure 1 Schematic diagram of the composition of the inclined shaft anti-sports car
The working principle is as follows: When the mine car reaches the distance of about 25 m from the barrier door at the normal speed, the barrier door automatically opens to let the mine car pass. When the mine car passes all the way, the door will automatically close and close; if the mine car has a sports car or derailment In other cases, since the barrier door is always in the normally closed state, the mine car is flexibly blocked to ensure the safety of the underground workers and equipment.
The block diagram of the electrical system of the double-remaining normally closed inclined shaft sports car protection device is shown in Figure 2. It is mainly composed of PLC controller, PLC controller component board, power transformer, motor control main contactor, motor control auxiliary contactor, Three-phase motor and sensor A, B, C, E, F and so on. The PLC controller is the control core of the system. The power transformer will provide the normal working voltage for the PLC controller. The three-phase motor will complete the lifting and lowering operation of the barrier gate. Sensor A, sensor B and sensor C are mounted on the rail, see Figure 1. Among them, sensor A and sensor B complete the speed measurement function when the mine car goes down, and sensor B also completes the determination of the vehicle block when the mine car is ascending. The sensor C is used to release the signal of the door of the car when the mine car is descending, and the signal of the door of the car is issued when the mine car is going up. The sensor E and the sensor F are respectively used for the lifting and lowering of the barrier door, and are installed on the steel plate near the door shaft. The PLC controller interface board completes the exchange and transfer of information between the PLC controller and the motor-controlled main and auxiliary contactors and the five sensors.
Figure 2 Block diagram of the electrical system of the double-remaining normally closed anti-sports car device based on PLC
The whole system works as follows: after power-on, the PLC controller will generate 24V DC, and the five controllers will be in the standby state through the PLC controller interface board. The PLC controller will detect whether the motor main control contactor is normal. If it is normal, The motor control auxiliary contactor is in the hot backup state, otherwise the motor control main contactor is cut off immediately, and the auxiliary contactor is put into operation. Then the PLC will automatically determine whether the barrier gate is placed in place. If it is not placed in place, the actuator will automatically lower the barrier door. When there is a mine car going down, the sensors A and B pass the time signal of the mine car passing over them to the PLC controller, and the PLC controller will determine whether the speed of the mine car is normal. If the speed of the mine car is within the normal speed range, the PLC control will control the forward rotation of the motor to complete the operation of the door opening door; after the position on the door of the car is mentioned, the sensor E will issue the above mentioned bit signal, and the PLC controller will control The motor stops rotating; when the mine car passes over the sensor C, the sensor C will send a signal that the mine car passes down the gate of the car, and the PLC controller will control the motor to reverse the door of the car, and the sensor F will be released after being placed in place. In place signal, the PLC controller controls the motor to stop, so that the door is in the normally closed state; when the down speed of the mine car exceeds the normal working speed or the mine car is derailed, the PLC will control the motor not to work, and the door in the normally closed state will be closed. The mine car is stopped to ensure the safety of the equipment and personnel in the lower part of the inclined shaft. When the mine car passes over the sensor C, the sensor C will send out the up signal of the mine car. After the PLC controller receives the signal, the control contactor will lift the net door; after the mine car passes the B sensor, the B sensor will send the upward mine car. Crossing the gate of the parking gate, the PLC controller controls the motor to lower the barrier door and complete a cycle.
For some reason, the power supply system of the anti-sports car is powered off. At this time, if the mine car is at the bottom of the mine yard, when the power supply is restored, the system will automatically determine whether the mine car is up or down, ensuring the normal operation of the entire device.
The power supply of the anti-sports car device and the winch control circuit are interlocked, that is, the winch is energized, and the anti-sports device is energized; when the winch is powered off, the anti-sports device is powered off and stops working. The winch room is equipped with a fault alarm and a door status display box of the anti-sports device, and the display box will complete the system fault alarm function of the anti-sports device. In the event of a malfunction of the device, the fault alarm display box of the winch room immediately gives an alarm message, and an audible and visual alarm appears, informing the winch operator to take the necessary measures.
2 Technical features
The most prominent technical features of the double-redominal normally closed inclined shaft anti-sports car device based on PLC are as follows:
(1) Aviation double redundancy technology was first applied in this field. The lifting and lowering operation of the blocking net door in the device is completed by a three-phase motor, and the forward and reverse rotation of the three-phase motor is controlled by the AC contactor. Since the AC contactor works frequently and the working current is large, it is very It is easy to damage. In order to make the whole device work reliably, the double redundancy technology commonly used in the aviation field is applied to this field for the first time, so that the problem is effectively solved. The specific method is: the forward and reverse rotation of the motor is controlled by two sets of AC contactors, each set has two contactors, one is the main contactor, and the other is the auxiliary contactor. The auxiliary contactor is hot when the main contactor works normally. In the backup state, once the main contactor is abnormal, the auxiliary contactor is put into operation immediately to ensure the system continues to operate, achieving double redundancy control, improving the system's working reliability, prolonging the service life of the system, and at the same time, the winch room alarm The device emits an intermittent alarm sound to remind professional maintenance personnel to perform maintenance as soon as possible.
(2) The parking gate of the anti-sports car device integrates the advantages of the rigid door and the flexible door, and has a reverse automatic door breaking function. When the mine car passes through the barrier door normally, the door will automatically close and let the mine car pass; when the sports car appears, the mine car will impact the car door to make the wire mesh automatically escape from interception, and the car net absorbs energy. Under the action of the device, the mine car is flexibly decelerated until it stops completely. The keel door frame is tilted up by the movement of the vehicle and is almost free from external forces, so that the inherent defects of the rigid door impact damage are eliminated, and the maintenance is simple and convenient. When the mine car goes up, for some reason, the door of the car is not closed. Under the impact of the mine car, the goalkeeper is jacked up to complete the reverse automatic door breaking, so that the mine car passes smoothly, and the flexible door jam truck is broken. , causing defects in the artificial sports car accident. The barrier net door absorbs the respective advantages of rigid interception and flexible interception and abandons their respective shortcomings, forming a unique barrier net door, which further improves the reliability of the entire device.
(3) Flexible interception. The energy-saving device is designed by the flexible deceleration technology of the carrier carrier landing, so that the barrier door of the device can flexibly intercept the mine car, with leading technology and large energy absorption, and the damage degree of the mine car is reduced to a minimum. The controller of the double-remaining normally closed inclined shaft anti-sports car protection device is the core control part of the whole device. It is installed in an explosion-proof box with a net weight of about 70 kg of 900 mm × 500 mm × 150 mm. The servo mechanism is controlled by the motor. The AC contactor and the motor control auxiliary AC contactor are combined to realize double redundancy control, and are separately placed in the left control cavity of the wiring compartment 1 in order to improve the reliability of the system. The PLC programmable controller, the PLC controller interface board and its power transformer are placed in the right control cavity of the wiring compartment 2. The sensor cable and the sound and light alarm cable are taken out from the wiring chamber 2. The 127V/50Hz power supply required by the controller and the AC power required by the servo mechanism are introduced from the wiring chamber 1. The internal structure of the explosion-proof box is shown in Figure 3.
Figure 3 Internal structure of the explosion-proof box of the double-remaining normally closed anti-sports car device
3.2 Deceleration absorber
The decelerating energy absorbing device is a key component of the device to realize flexible braking. It is designed by the landing speed reduction principle of the carrier aircraft. It has large energy absorption, short spitting rope, convenient suction size adjustment, small size, simple structure and convenient installation. Easy to maintain and reusable. It mainly consists of a compression spring, a friction mechanism and a rotor shaft. The friction mechanism is formed by alternately stacking a movable friction steel sheet rotating with the rope and a non-moving friction steel sheet rotating without the square shaft. In order to make the two friction steel sheets sufficiently contact and increase the friction force, the two friction steel sheets are used. An asbestos friction disc that can be rotated with the square shaft is placed between them. The frictional force of the friction mechanism mainly depends on the strength and pressure of the compression spring, which determines the energy absorption of the energy absorber and the length of the rope. The brake cable is fixed and wound on the square shaft. When a sports car occurs, the car net will fall off the door of the car, and the car will descend, pull the cable on the energy absorber to rotate the square shaft, and gradually convert the movement energy of the car into the friction mechanism of the energy absorber. The thermal energy and the potential energy of the compression spring slow down the mine car and finally stop, achieving flexible interception and minimizing the damage of the mine car.
Figure 4 Schematic diagram of the energy absorber
3.3 Power Transformer
Since the underground 127V AC fluctuation is very large, and the PLC controller operating voltage range is between 100~240V, in order to ensure the stable and reliable operation of the control core PLC of the whole device, the 127V AC power is converted to 170V by the power transformer and then sent to the PLC. This ensures that when the 127V AC power supply voltage changes greatly between 75 and 175V, the PLC can still work normally, ensuring reliable operation of the entire device. The power transformer is an important component of the control box. In order to ensure the safety and reliability of the device, the transformer primary and secondary line packages must be isolated and must be shielded.
4 Conclusion
This device is mainly used in coal mining, metal mining, non-metallic at all angle of 30 ° or less or a double-track monorail transportation lift slope roadway mining. The outstanding features of the device are safe and reliable, and easy to use and maintain. It has been installed and used in many coal mines such as Xinjiang Dahonggou Coal Mine, Shandong Liyan Group Xinhe Coal Mine, and Shaanxi Hancheng Xiakoukou Coal Mine. It has been proved that its long life, stable performance, reliable and safe, it is worth further promotion.
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