CN212173626U

CN212173626U - Protection control device for failure safety type mining belt conveyor

Info

Publication number: CN212173626U
Application number: CN202020377771.3U
Authority: CN
Inventors: 张晋翔; 张亚星
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2020-12-18
Anticipated expiration: 2030-03-23

Abstract

The invention relates to a design scheme of a national essential device for safe operation of a mining belt conveyor. The system comprises a program control host, a self-reset emergency stop sensor, a deviation sensor, a tearing sensor, a speed sensor, a temperature sensor, a smoke sensor, a tension sensor, a photoelectric detection sensor, a net detaching sensor, a communication acousto-optic annunciator, a rear limit sensor and a coal piling sensor; aiming at the condition that the contact is extremely easy to be poor or damaged under the underground corrosive gas or water environment, and no sign is given in advance; the scheme totally uses a two-wire normally closed inductive proximity switch as a monitoring loop, if the two-wire normally closed inductive proximity switch is in action or fault, after a voice signal gives an alarm, a text display displays the corresponding fault and stops the vehicle, and the reason and the place are clear at a glance. The host computer does not have the button, has solved the problem that the circuit board wets well, uses remote control operation, and password is authorized, prevents other people maloperation to can get a point automatically when driving, be the safe type design of trouble.

Description

Protection control device for failure safety type mining belt conveyor

Technical Field

The utility model discloses the scheme relates to conveyer protection technical field, concretely relates to belt conveyor protection control device for mining.

Background

At present, the belt conveyor comprehensive protection device on the market is a configuration that a main machine is provided with seven-segment codes, a light-emitting diode display (only one diode display is available) and a voice alarm is added. For example, when characters displayed on a panel correspond to light emitting tubes to emit light, and a belt with the length of more than 1000 meters is reported to be suddenly stopped, more than ten sudden stops at positions are usually arranged on the belt with the length of more than 1000 meters, inspectors can only check which position the sudden stop occurs one by one, and if the position is a fault, the fault is more difficult to find. For example, when the signal of the circuit is a high internal resistance signal, experiments show that the circuit has a resistance of 5M omega to 8M omega to display an emergency stop. And the condition that the external part looks normal and the internal small switch mechanism is blocked is difficult to find. The contact is affected with moisture, corrosion and oxidation, poor contact and the like. So that the work test is normal, and the emergency situation can be out of order; therefore, the maintenance personnel often find the reason for half a day, but the reason cannot be found, which is time-consuming and labor-consuming. In addition, air is moist, the dust amount is large, and the machine vibrates, so that moisture and corrosive gas cannot enter the machine without holes, a mechanical action mechanism is corroded and stuck, and the personal safety of equipment and operators is greatly harmed.

The existing deviation sensor on the market adopts a vertical mechanical structure, and a shaft with six millimeters penetrating through a rotary probe rod is arranged on the sensor. Inside is a resettable small contact switch. When the adhesive tape deviates, the structure is easily bent or broken by the deviating adhesive tape to damage a six-millimeter shaft. The vertical shaft is also very easy to enter dust and water from the upper part, so that the mechanism is not flexible or is blocked, and the small switch inside is corroded by dust and water to cause electric leakage and damage, so that the deviation sensor is poor in action or fails and is damaged.

The coal piling sensors in the market have two types, one is an induction type, and the other is a mechanical feeler lever displacement type. When the induction type coal piling is adopted, signals are grounded from the probe rod through the piled coal, so that the amplifier on the circuit board amplifies the signals, the small relay is pushed to act, and the host machine is stopped when receiving a low level. If the gangue is a poor conductor during conveying, the gangue cannot be sensed and the vehicle cannot be stopped. The mechanical feeler lever displacement type is that when materials are accumulated, the materials are transmitted to an internal small contact switch to be switched on by touching the feeler lever displacement, and a host is stopped when receiving a low level. When the coal is conveyed to a small extent, the probe rod is buried, and displacement and stopping cannot be caused. Both sensors will be damaged by water or gas corrosion and because of a low level stop, if the damage causes the main machine to not receive a low level signal, the main machine will not stop and will not have any sign in advance.

The existing tearing sensor in the market is provided with two plates, namely an upper bakelite plate and a lower bakelite plate, which are plated with copper electrodes, or a plurality of light-touch microswitches are provided with springs in the middle, the springs are externally wrapped with flame-retardant cloth and are arranged on a steel plate, a positive wire and a negative wire are respectively inserted on two electrode plates, when an external force is applied, the two plates are contacted and conducted, a low level is output, and a host computer acts when receiving the low level. The other one has no bakelite board, 3 springs in the middle and insulating sleeves on two sides. Both of them are easy to be damaged, and they are not connected to each other due to water, electric leakage or rust and corrosion of electrode. Or may be turned on and off when leakage occurs. Because of the low-level parking, the vehicle is usually not connected, the protection effect is lost, and no sign exists before.

No rear limit sensor is arranged on the market, so that when a bottom belt is fed or the belt is overfull, massive materials such as waste rocks fall into the bottom belt and are conveyed into a tail, and the tail is damaged or people are injured.

Disclosure of Invention

The invention relates to a design scheme of a device which is necessary for safe operation of a mining belt conveyor in China, aiming at the situation that the device is easy to contact badly or damage under underground corrosive gas or water environment and has no sign in advance; all the switch values of the scheme use a two-wire normally closed inductive proximity switch as a monitoring loop, if the switch values are in action or fault, after a voice signal gives an alarm, a text display displays the corresponding fault and stops the vehicle, and the reason and the place are clear at a glance. The host computer does not have the button, has solved the problem that the circuit board wets well, uses remote control operation, and password is authorized, prevents other people maloperation to can open the point automatically when the start-stop, be the safe design of trouble, the enterprise that adapts to underground mining flammable and explosive environment formula conveyer or use belt conveyor uses.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the mining belt conveyor protection device comprises a program control host and a signal sensor connected with the program control host. The program control host comprises an upper intrinsic safety cavity and a lower explosion-proof cavity, wherein the upper intrinsic safety cavity comprises a plate-type plc control core, a liquid crystal display and a remote control receiver, the plate-type plc control core is installed in the center of the rear wall of the upper intrinsic safety cavity, the remote control receiver is installed at the bottom of the upper intrinsic safety cavity, the liquid crystal display is installed in the center of the inner wall of a front opening door of the upper intrinsic safety cavity, and an explosion-proof glass is installed in a rectangular hole formed in the middle of the front opening door to serve as a visual window; the lower explosion-proof cavity comprises a switch power supply module, a small high-breaking circuit breaker, a small direct current relay and an alternating current/direct current small relay, the switch power supply module is arranged on the rear wall of the front door, the left two-pole small high-breaking circuit breaker, the middle five small direct current relays and the last alternating current relay are arranged in a row and clamped on a 35 mm standard clamping rail, the standard clamping rail is positioned in the center of the rear wall in the lower explosion-proof cavity and used as a passive control contact of an external output relay to complete switch control and interlocking, and the upper cavity and the lower cavity are communicated through a spiral lead-in device by a multi-core cable; any button is not designed on the outer shell panel, a PLC control program is used as a control core, remote control operation and password authorization are used, and the high speed and the low speed of the motor are automatically switched according to the rotating speed control; the signal sensors connected with the program control host comprise a self-reset type emergency stop sensor, a deviation sensor, a tearing sensor, a coal piling sensor and a rear limit sensor which are designed autonomously, and are provided with a photoelectric detection sensor, a net detaching sensor, a speed sensor, a temperature sensor, a tension sensor, a smoke sensor and a communication acousto-optic annunciator which are not designed autonomously.

An emergency stop sensor: each emergency stop is fed back to the host as a unique address. The contact is cancelled in the aspect of moisture resistance, and the two-wire normally closed induction type proximity switch is used, so that the moisture resistance is realized, the damage is not easy, and a normally closed signal detection loop is also realized. When the line is broken, the sensor is damaged or the contact of the action line is poor, the voice signal can give an alarm, and the fault location, the emergency stop number and the fault name can be displayed at a glance. When the action feeds back the rising edge (high level) of the first counting pulse of the host for the first time, the host judges the sudden stop and outputs the sudden stop protection, and the vehicle can be started again at the moment. When the vehicle operates for the second time, the main machine judges that the vehicle is locked, the main machine does not operate mistakenly, and the vehicle can be driven by pressing the emergency stop pull rope to reset after finding out the reason on site. In another case, when a foreign object is hooked or the H-shaped frame is tilted, the self-reset spring cannot be reset, and at this time, the belt conveyor is locally damaged, and the main machine is judged to be permanently locked. The car cannot be driven when not repaired. In the mechanical setting, a self-reset large pressure spring is adopted, and the stainless steel sliding part is made of an antirust material to ensure the action reliability.

The working principle of the emergency stop sensor is as follows:

the mechanical structure diagram is shown in fig. 4, the emergency stop sensor is that a stainless steel drilling slide block 4 is arranged in a shell 1, a stainless steel through shaft 2 for transferring force outwards is arranged on the stainless steel drilling slide block 4, a reset spring 3 penetrates through the stainless steel through shaft 2, the stainless steel through shaft 2 is connected with the stainless steel drilling slide block 4 through a positioning pin 6, when a hand or other mechanical external force acts on a pull rope, the force is enabled to slide through the stainless steel through shaft 2, the stainless steel drilling slide block 4 overcomes the elastic displacement of the spring 3, when the two-wire normally closed inductive proximity switch 5 detects that the metal displacement shields the high level of a feedback host machine to stop, and when the external force is lost, the stainless steel drilling slide block 4 returns to a normal mechanical position under the balance action of the left spring 3 and. Because the center of the stainless steel drilling sliding block 4 is drilled, a signal cannot be detected, a low level is output to feed back to the host, and the host receives the low level signal and judges that the sensor is normal.

The working principle of the deviation sensor is as follows:

the mechanical structure diagram of the deviation sensor is shown in fig. 5, a sliding fork transverse pushing structure is adopted, an upper carrier roller of 80 mm is used as transmission for a rotating roller 8, when the rubber belt deviates, the deviated rubber belt pushes the rotating roller 8 to move, the rotating roller 8 pushes an upper sliding fork 9 to move, a stainless steel sliding shaft 7 is moved, a stainless steel drilling sliding block 4 is driven to overcome the elastic force displacement of a spring 3, when a two-wire normally closed inductive proximity switch 5 detects metal displacement and feeds back to a high level of a host machine, the two-wire normally closed inductive proximity switch 5 operates after 10 seconds of delay and stops, and when the rubber belt does not deviate, the two-wire normally closed inductive proximity switch 5 resets by a right spring 3 reverse pushing action mechanism. Because of adopting the sliding fork to violently push away the structure, the stainless steel axle is rust-resistant, and big thrust spring resets, so the action is nimble, and dampproofing rust-resistant not cassette tape.

The working principle of the coal piling sensor is as follows:

the structure diagram of the coal piling sensor designed by the invention is shown in figure 6, the coal piling sensor maintains the displacement shape and the mechanical structure of a mechanical feeler lever, an internal small switch is replaced by a two-wire normally closed inductive proximity switch 5, a 2500-time casting type amplifier 10 is connected in series, a power supply end C of the amplifier 10 is connected with the negative electrode of the two-wire normally closed inductive proximity switch 5, a resistor R1 is added at a signal input end B at the power supply end, the signal input end is connected with a shell, an E end of the amplifier 10 is connected with COM as a forward bias to make the amplifier saturated and conducted as a normal low level, special insulators are arranged on the shell and the top, when coal piling, a small resistor R2 is added at the input end equivalent to the amplifier 10 to the ground to make the amplifier 10 withdraw and conduct the input end of a program-. Therefore, the mechanical probe rod is also used as an induction probe rod, and materials are conveyed and accumulated, and at least one action can be ensured due to the characteristics of two sensors. Because the normal state is in the series normally closed state, the high level of the host can be fed back when the fault occurs, and therefore, the vehicle can not be driven when the fault occurs because the high level is in the broken line damage state, and the design of the fault safety type circuit is provided. And because the two-wire normally closed inductive proximity switch and the casting amplifier are adopted, the moisture and shock resistance greatly improves the reliability of the equipment.

The working principle of the tearing sensor is as follows:

the mechanical structure diagram of the tearing sensor is shown in fig. 7, the tearing sensor is formed by welding a rectangular angle iron frame as a

support frame

11, 4 thin steel wire ropes 12 coated with an anti-rust layer are pulled in the middle of the tearing sensor, one end of each rope is pulled with a steel column type stainless steel sliding head 13, springs 3 penetrate through the steel column type stainless steel sliding heads 13, the rectangular angle iron frame is punched, the steel column type stainless steel sliding heads 13 penetrate through the rectangular angle iron frame holes, normally closed inductive proximity switches 5 are installed at the other ends of the steel column type stainless steel sliding heads 13, the other ends of the steel column type stainless steel sliding heads 13 and the two-wire normally closed inductive proximity switches 5 are installed in a closed cavity, and flame retardant cloth 14 covers the thin steel wire ropes 12. When about 1 kg of materials fall on the flame-retardant cloth, the thin steel wire rope generates pulling force under the action of gravity, and the sliding head is pulled to leave the proximity switch induction head, so that the proximity switch outputs high level to feed back the host computer to stop.

The working principle of the rear limit sensor is as follows:

the mechanical structure diagram of the rear limit sensor is shown in fig. 8, the rear limit sensor is installed on an H-frame 15 which is 10-20 meters away from the tail of a belt conveyor, a left channel steel and a right channel steel on the H-frame 15 are punched, a left hanging lug and a right hanging lug 16 are installed, an i-shaped material detector 17 is composed of an upper horizontal shaft 18 and a lower detection end 19, the upper horizontal shaft 18 of the i-shaped material detector 17 transversely penetrates through the left hanging lug and the right hanging lug 16, the lower detection end 19 is connected with a lower detection end head 20 made of adhesive tape strips, the lower detection end head 20 is one centimeter away from a lower belt 21, two ends of the upper horizontal balance shaft 18 are provided with induction detection blocks 22, the induction detection blocks 22 are right opposite to a two-line normally closed induction type proximity switch 5, a carrier roller 23 is positioned below the lower belt 21, when a material passes through the lower belt 21, the i-shaped material detector 17 can be touched, the induction detection blocks 22 are, the display screen displays the corresponding fault and the sound and light signal gives an alarm.

The beneficial effect of this scheme is: plate plc was used as the control core. The liquid crystal display device has a Chinese character display function. The special design is carried out on the sensing acousto-optic control of sudden stop, deviation, alarm and the like, and the novel sensor has a plurality of innovations compared with the existing products in the market. And the key part is made of stainless steel instead, so that the reliability of the action is greatly improved. The host computer is not designed with a horn, a button and the like, but adopts full remote control operation. The occurrence of the conditions of wetting, corrosive gas invasion, misoperation and the like of the circuit board is reduced. The display screen can display the states, positions, numbers and fault types of various sensors, is clear at a glance and is convenient to maintain.

Mechanical contacts are not used outside the whole device, and an inductive sensor and a photoelectric sensor are adopted. The key relay and sensor are made of ohm dragon products, and reliability and sensitivity of the relay and sensor are greatly improved. When the machine is out of order, the device can make the belt conveyor unable to run and give out alarm sound. The main machine can display the temperature inside the machine head, the temperature of the roller, the tension force of the tensioning and the speed data of the roller when the main machine is not in operation or in normal operation. The device has the functions of resettable pulse emergency stop, deviation, coal piling, speed, smog, tearing, pulling force, overtemperature water spraying, material photoelectric detection, rear limit, grid and power off detaching, automatic starting and stopping and remote control.

Drawings

Fig. 1 is a general structural view of the present invention.

Fig. 2 is a schematic diagram of the circuit of the present invention.

Fig. 3 is a circuit wiring diagram of the present invention.

Fig. 4 is a schematic structural diagram of the emergency stop sensor of the present invention.

Fig. 5 is a schematic structural diagram of the deviation sensor.

FIG. 6 is a schematic diagram of the coal pile sensor of the present invention.

FIG. 7 is a schematic view of the tear sensor of the present invention.

Fig. 8 is a schematic diagram of a rear limit sensor structure according to the present invention.

Detailed Description

The protection control device for the coal mine failsafe belt conveyor shown in fig. 1 is composed of a program control host and a sensor connected with the program control host. The program control host comprises an upper intrinsic safety cavity and a lower explosion-proof cavity, wherein the upper intrinsic safety cavity comprises a plate-type plc control core, a liquid crystal display and a remote control receiver, the plate-type plc control core is installed in the center of the rear wall of the upper intrinsic safety cavity, the remote control receiver is installed at the bottom of the upper intrinsic safety cavity, the liquid crystal display is installed in the center of the inner wall of a front opening door of the upper intrinsic safety cavity, and an explosion-proof glass is installed in a rectangular hole formed in the middle of the front opening door to serve as a visual window; the lower explosion-proof cavity comprises a switch power supply module, a small high-breaking miniature circuit breaker, a direct current relay and an alternating current/direct current miniature relay, wherein the switch power supply module is arranged on the rear wall of the front door, the left two-pole small high-breaking miniature circuit breaker, the middle five small direct current relays and the last alternating current relay are arranged in a row and clamped on a 35 mm standard clamping rail, the standard clamping rail is positioned in the center of the rear wall in the lower explosion-proof cavity, and the upper cavity and the lower cavity are communicated through a spiral lead-in device by a multi-core cable; any button is not designed on the outer shell panel, a PLC control program is used as a control core, remote control operation and password authorization are used, and the high speed and the low speed of the motor are automatically switched according to the rotating speed control; the signal sensors connected with the program control host comprise a self-reset type emergency stop sensor, a deviation sensor, a tearing sensor, a coal piling sensor and a rear limit sensor which are designed autonomously, and are provided with a photoelectric detection sensor, a net detaching sensor, a speed sensor, a temperature sensor, a tension sensor, a smoke sensor and a communication acousto-optic annunciator which are not designed autonomously.

Installing a host computer and a sensor of the program control host computer: the main machine of the program control host is hung in a roadway near an explosion-proof switch of the control belt, the hanging is firm, the ground is separated by more than 0.5 meter, and local grounding is arranged. The coal piling sensor is arranged at a proper position above the coal bunker or the conveyor reaching position, and an insulator is added on the shell for fixing. The speed sensor is fixed on a belt machine, is 315 mm away from the ground, and is 2-3 mm away from a bolt head of a bearing end cover of the bend drum. The temperature sensor is arranged at a position 5-10 cm close to the contact surface of the main roller of the belt conveyor and the belt. The deviation sensor is arranged at the head, two sides of the last group of big frames and the tail, and the last group of big frames reaches the joint. The smoke sensor is arranged at a lower air inlet above the main roller and 10-15 meters away from the lower air inlet. The tear sensor is mounted at a suitable position in front of the coal feed point. The tension sensor is arranged at the joint of the steel position rope of the tensioning vehicle and the buffer spring, the amplifier is arranged on the large frame, and the concave part is arranged under the steel at the slot point, so that water and coal can not reach the amplifier. The emergency stop sensors are arranged on the pedestrian side of the belt frame from the head to the tail, one sensor is arranged at an interval of 100 meters, and all the emergency stop sensors are connected by steel position ropes. Each group of H frames is provided with a steel wire rope supporting point. The light detection sensors are arranged along the belt at the positions 20 meters back and forth of the convex part of the terrain of the belt. With the transmitter in front and the receiver in back. The rear limit sensor is arranged at the position 10-20 m in front of the tail, a hole is formed in the H frame, the H frame is arranged in the middle of the upper bottom belt, and the detection head is 1 cm away from the bottom belt. The net detaching sensor is arranged on the big frame of the machine head, the sensing metal sheet is arranged on the machine head household net, and when the net is detached, the net is automatically powered off.

The model of a coal mine failsafe belt conveyor protection control device is K H P2020Z 1, wherein K is for mining, H is for protection, P is for a belt, 2020 is scheme design time, and Z1 is an intelligent failsafe equipment number. The use environment of the mine fault-safe belt conveyor protection control device according with the fault-safe type is as follows:

1) altitude is less than or equal to 2000m (gas 80kPa to 110kPa)

2) The ambient temperature is 0 ℃ to +40 ℃.

3) Ambient relative humidity is no greater than 95% (+25 ℃).

4) In mines with explosive gases and coal dust.

5) In an environment without strong vibration impact.

6) Without corrosive gases that damage metal and insulator materials.

7) Can prevent sewage and other liquid from immerging into the place.

8) Installation type: and (III) class.

9) Pollution grade: and 3, grade.

The device comprises the following components:

Figure DEST_PATH_402508DEST_PATH_IMAGE001

the main technical parameters are as follows:

rated operating voltage: AC110V-220V

The voltage is allowed to fluctuate: 75 to 110 percent

Intrinsic safety output rated voltage: DC23.9V

The intrinsic safety outputs the maximum current: 4000MA

Figure DEST_PATH_946753DEST_PATH_IMAGE002

The operation and the function of the mining belt conveyor protection device are as follows:

and (3) lifting: the first time of starting the car needs to input the password, the switch is closed first, the password is input, and the number 1 key can be pressed to reset (when various sensors are normal). Entering a ready start or feeding state. When a bottom belt material conveying belt conveyor is used during tunneling, a No. 4 key is pressed to automatically click four tones, the four tones are clicked after two seconds, the belt starts to run after 16 seconds of clicking until materials enable a rear limit material monitoring switch (rear limit) to act to stop conveying, a 3-second long-bell alarm is sent out, and the condition that the conveying is in place is warned. The automatic discharging table (or the automatic discharging table) does not need to be stopped, and the position is limited after the automatic discharging table is released. And the corresponding state is displayed on the screen.

And (3) lifting: the input password (when various state sensors are normal) is reset. Pressing the No. 3 key to click two sounds automatically, clicking two sounds again at an interval of 2 seconds, and entering a starting state after 13 seconds of clicking. And the corresponding state is displayed on the screen.

Parking: when feeding, the No. 5 key is pressed, and when driving, the No. 6 key is pressed, and the vehicle can be stopped.

And (3) overhauling: when foreign matters fall into the machine head, are stuck, are twisted and the like, the second key can be clicked to rotate forwards and backwards to exit as long as the safety loop is normal.

And (3) speed monitoring: and pressing a third button or a fourth button, delaying for ten seconds from the start, and entering a speed detection state. High speed operation occurs when 80 counting pulses are received every 10 seconds, low speed operation occurs when 40 counting pulses are received every 10 seconds, and an alarm is given and the machine is stopped when 39 counting pulses are received or less every 10 seconds. The screen shows the last 10 seconds of pulse value when slipping.

Coal piling protection: when the sensor feeler lever deviates from the normal position by 20 degrees +/-3 degrees and delays for 2 seconds or when the coal level contacts the feeler lever, the device stops to realize coal piling fault protection.

Off tracking protection: when the probe rod of the sensor deviates 3cm from the normal position, the time is delayed for 10 seconds, and the device can realize deviation fault protection when parking.

Smoke protection: when smoke is generated, the smoke sensor sends the signal to the host, and the device stops to realize smoke protection.

Temperature protection: when the temperature of the main roller of the monitoring point exceeds the set temperature of the sensor by 50 ℃ or the temperature in the machine head reaches 55 ℃, the device stops the vehicle to realize temperature fault protection, and displays corresponding temperature values and positions. And simultaneously opening the electromagnetic valve to spray water and reduce the temperature.

Emergency stop along the line, when someone or material touches the automatic reset pull line along the line, the self-reset emergency stop switch is caused to stop suddenly so as to stop the vehicle. But the lock cannot be realized, and the pull wire can be locked only by pressing the emergency stop switch. And in the field, when the third stay wire is pressed down, the resetting state is entered. The vehicle can be driven, and if the vehicle is stopped permanently, the pull wire can be hung on the longitudinal beam, so that the vehicle cannot be reset. However, this method can only be used for temporary emergency stops, which are strictly prohibited as maintenance and stopping measures. And the power supply must be cut off when the maintenance is carried out.

And (3) tearing protection: when the belt has a tearing fault, materials sprayed from the tearing port fall on the tearing sensor for about 1 kg, the sensor sends a tearing signal to the host machine, and the device stops to realize tearing protection.

Protecting the tension force: when the belt tensioning degree of the belt conveyor exceeds the limit, the vehicle cannot be driven, and the sound and light signals give an alarm. The device can only be adjusted by inching and opening the tensioning winch. And displaying the current tension. The control of the tensioning vehicle can be tensioned only when the tensioning force is smaller than a specified standard value or the tensioning vehicle slips, the vehicle cannot be loosened during normal operation, and the remote control can be operated while tensioning or loosening is carried out when adjustment is needed, so that the real-time situation of belt tightness can be observed in time, and the problems that the machine head is damaged or the belt is broken due to the fact that the belt is loosened by mistake when the self-locking loop of the tensioning vehicle is used in the past are avoided.

Photoelectric detection: the photoelectric detector can detect materials whether the vehicle is started or stopped or not, and displays whether the materials exist or not. An operator can correctly judge whether materials are carried on the belt or not, and the material error stop is reduced, so that the overload starting is avoided.

Breaking the network and powering off: during the operation of the belt, the machine head strictly forbids the opening of the protecting net for coal cleaning and object cleaning, so that the protecting net is added for monitoring, the vehicle can be driven only when the protecting net is firmly installed, and otherwise, the vehicle can be alarmed and cannot be driven.

Rear limit: when the bottom belt is fed or the belt is overfull, massive materials such as waste rocks fall into the bottom belt and are sent into the tail, so that the tail is damaged or people are injured, and a rear limit is designed for the reason. The vehicle is stopped immediately by the impact of the materials. And an alarm is given.

The present invention is not limited to the embodiments of the present invention, and therefore, the present invention can be modified or changed by those skilled in the art without departing from the spirit and scope of the present invention, and therefore, the scope of the present invention is defined by the appended claims.

Claims

1. A belt conveyor protection control device for a failure safety type mine is characterized by comprising a program control host and a signal sensor connected with the program control host, wherein the program control host comprises an upper intrinsic safety cavity and a lower explosion-proof cavity, the upper intrinsic safety cavity comprises a plate-type plc control core, a liquid crystal display and a remote control receiver, the plate-type plc control core is installed in the center of the rear wall of the upper intrinsic safety cavity, the remote control receiver is installed at the bottom of the upper intrinsic safety cavity, the liquid crystal display is installed in the center of the inner wall of a front door of the upper intrinsic safety cavity, and an explosion-proof glass is installed in the middle of the front door to serve as a visual window of the liquid; the lower explosion-proof cavity comprises a switch power supply module, a small high-breaking circuit breaker and a small AC/DC relay, wherein the switch power supply module is arranged on the rear wall of the front door, the left two-pole small high-breaking circuit breaker, the middle five small DC relays and the last small AC relay are arranged in a row, clamped on a 35 mm standard clamping rail and arranged in the center of the rear wall in the lower explosion-proof cavity, and the upper cavity and the lower cavity are communicated through a spiral lead-in device by a multi-core cable; any button is not designed on the outer shell panel, a PLC control program is used as a control core, remote control operation and password authorization are used, and the high speed and the low speed of the motor are automatically switched according to the rotating speed control; the signal sensors connected with the program control host comprise a self-reset type emergency stop sensor, a deviation sensor, a tearing sensor, a coal piling sensor and a rear limit sensor which are designed autonomously, and are provided with a photoelectric detection sensor, a net detaching sensor, a speed sensor, a temperature sensor, a tension sensor, a smoke sensor and a communication acousto-optic annunciator which are not designed autonomously.

2. The failsafe mining belt conveyor protection control of claim 1, it is characterized in that the emergency stop sensor is a stainless steel drilling slide block (4) arranged in a shell (1), a stainless steel through shaft (2) for transferring force outwards is arranged on the stainless steel drilling slide block (4), a return spring (3) is penetrated on the stainless steel through shaft (2), the stainless steel through shaft (2) is connected with a stainless steel drilling slide block (4) through a positioning pin (6), when a pull rope is acted by hand or other mechanical external force, the force is enabled to slide through the stainless steel through shaft (2), the stainless steel drilling slide block (4) overcomes the elastic force of the spring (3) to displace, when the two-wire normally closed inductive proximity switch (5) detects that the metal displacement is fed back to the high level of the host, the stainless steel drilling slide block (4) returns to the normal mechanical position under the balance action of the left spring and the right spring (3) when the external force is lost.

3. The belt conveyor protection control device for the failsafe mine according to claim 1, characterized in that the deviation sensor adopts a sliding fork transverse pushing structure, the rotating roller (8) adopts an upper supporting roller with the length of 80 mm as a transmission, when the belt deviates, the deviated belt pushes the rotating roller (8) to move, the rotating roller (8) pushes the upper sliding fork (9) to move, so as to move the stainless steel sliding shaft (7), drive the stainless steel drilling sliding block (4) to overcome the elastic force displacement of the spring (3), when the two-wire normally closed inductive proximity switch (5) detects the metal displacement and feeds back the high level of the host, after 10 seconds of delay, the two-wire normally closed inductive proximity switch (5) stops, and when the belt does not deviate, the two-wire normally closed inductive proximity switch (5) resets by a reverse pushing action mechanism of the right spring (3).

4. The belt conveyor protection and control device for the failsafe mine according to claim 1, characterized in that the tear sensor is formed by welding a rectangular angle iron frame as a support frame (11), 4 thin steel wire ropes (12) coated with an anti-rust layer are drawn in the middle of the rectangular angle iron frame, one end of each rope is drawn with a steel column type stainless steel sliding head (13), a spring (3) penetrates through each steel column type stainless steel sliding head (13), the rectangular angle iron frame is perforated, each steel column type stainless steel sliding head (13) penetrates through each rectangular angle iron frame hole, the other end of each steel column type stainless steel sliding head (13) is provided with a two-wire normally closed induction type proximity switch (5), the other end of each steel column type stainless steel sliding head (13) and the two-wire normally closed induction type proximity switch (5) are installed in a closed cavity, and the thin steel wire ropes (12) are covered with flame retardant cloth (14).

5. The failsafe mining belt conveyor protection control of claim 1, it is characterized in that the coal piling sensor reserves the displacement shape and the mechanical structure of a mechanical feeler lever, an internal small switch is replaced by a two-wire normally closed inductive proximity switch (5) which is connected in series with a 2500-time casting amplifier (10), a power supply end C of the amplifier (10) is connected with the negative electrode of the two-wire normally closed inductive proximity switch (5), a resistor R1 is added at the signal input end B at the power end, the signal input end is connected with the shell, the E end of the amplifier (10) is connected with COM, the amplifier (10) is saturated and conducted as normal low level because of the forward bias of the resistor R1, special insulators are arranged at the installation positions of the shell and the top, when coal is piled, a small resistor R2 is added to the input end of the amplifier to ground, so that the amplifier (10) is disconnected, and the input end of the programmable main computer is in high-level shutdown.

6. The belt conveyor protection and control device for the mine with the failsafe function according to claim 1, characterized in that the rear limit sensor is installed on an H-shaped frame (15) 10-20 meters away from the tail of the belt conveyor, left and right channel steel on the H-shaped frame (15) is punched, left and right hangers (16) are installed, an upper horizontal shaft (18) of an I-shaped material detector (17) penetrates through the left and right hangers (16), a lower detection end (19) is connected with a lower detection end head (20) made of adhesive tape strips, the lower detection end head (20) is one centimeter away from a lower belt (21), induction detection blocks (22) are installed at two ends of the upper horizontal shaft (18), the induction detection blocks (22) face two-line normally closed induction type proximity switches (5), a carrier roller (23) is located below the lower belt (21), when a material passes through the lower belt (21), the I-shaped material detector (17) can be touched, the induction detection block (22) leaves the two-wire normally closed induction type proximity switch (5), the corresponding host input end turns into high level to stop, the display screen displays corresponding faults, and the acousto-optic signal gives an alarm.

7. The belt conveyor protection control device for the mine with the failure safety type according to claim 1 is characterized in that mechanical contacts are not used in the whole device, all switching values used as monitoring loops are all two-wire normally closed inductive proximity switches and photoelectric sensors, and the belt conveyor protection control device can be automatically turned on and off when a vehicle is started or stopped.