CN107244538B - Emergency prevention and control system and method for coal conveying belt fracture - Google Patents
Emergency prevention and control system and method for coal conveying belt fracture Download PDFInfo
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- CN107244538B CN107244538B CN201710643939.3A CN201710643939A CN107244538B CN 107244538 B CN107244538 B CN 107244538B CN 201710643939 A CN201710643939 A CN 201710643939A CN 107244538 B CN107244538 B CN 107244538B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
- B65G43/02—Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load carriers, e.g. for interrupting the drive in the event of overheating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
- B65G2203/02—Control or detection
- B65G2203/0266—Control or detection relating to the load carrier(s)
- B65G2203/0275—Damage on the load carrier
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
- B65G2203/04—Detection means
- B65G2203/042—Sensors
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Abstract
The invention discloses a coal conveying belt breakage emergency prevention and control system and a method, wherein the system comprises a belt conveyor remote control console and a plurality of prevention and control protection devices, and each prevention and control protection device comprises a detection mechanism, a clamping machine and a control box; the method comprises the following steps: firstly, setting a belt fracture sinking distance threshold; secondly, initializing a damping mechanism; detecting the real-time distance from the eddy current displacement sensor to the metal plate and displaying the real-time distance; fourthly, judging whether the coal conveying belt is broken or not; fifthly, the current prevention and control protection device gives an alarm and locks the coal conveying belt; sixthly, transmitting fault information; seventhly, the residual prevention and control protection device brakes the belt conveyor; eighthly, the belt conveyor is braked comprehensively. According to the invention, the fracture information of the coal conveying belt is obtained by the induction of the eddy current displacement sensor and the metal plate, the positioning is accurate, the induction is accurate, the application is reliable, the damping mechanism is adopted to drive the vertical rod to press the coal conveying belt urgently and the coal conveying belt is clamped by the clamping machine, so that the safety in operation of the belt conveyor is protected.
Description
Technical Field
The invention belongs to the technical field of coal conveying belt fracture prevention and control, and particularly relates to a system and a method for emergency prevention and control of fracture of a coal conveying belt.
Background
An important link in coal mine production is a coal mine transportation system, and currently, the coal mine transportation system mainly adopts coal belt transportation. The belt conveyor in coal mine transportation generally needs to work for long distance, ultra-long working time and overweight transportation amount, and the problems of uneven stress of the rubber belt, coal falling position deviation, large transportation inclination angle and the like in the using process can cause the loosening, slipping, deviation, belt breakage and the like of the coal transportation belt. When the coal conveying belt breaks suddenly due to the quality problems such as overload and aging and improper operation reasons, the tight coal conveying belt can slide down rapidly due to breakage, even flies out to throw away to hit workers, and a large amount of scattered coal blocks can be hit to personnel and equipment, so that the life safety of the personnel is threatened, nearby equipment facilities are damaged, and huge economic loss is caused. At present, the proposed technology is basically a coal conveying belt fracture alarm device, the multiple monitoring ranges are too wide, the specific fracture points of the coal conveying belt cannot be accurately judged, and emergency treatment after fracture is not facilitated. And most of related technologies only have an alarm function and do not have a protection function for emergency treatment of broken coal conveying belts. Therefore, an emergency prevention and control system and method for coal belt breakage are needed, which effectively treat the breakage of the coal belt of the belt conveyor and avoid the subsequent casualties and equipment loss caused by the breakage of the coal belt.
Disclosure of Invention
The invention aims to solve the technical problem that the defects in the prior art are overcome, and the coal conveying belt breakage emergency prevention and control system is novel and reasonable in design, accurate in positioning, accurate in sensing, reliable in application and convenient to popularize and use, acquires breakage information of a coal conveying belt through the induction of an eddy current displacement sensor and a metal plate, adopts a damping mechanism to drive a vertical rod to press the coal conveying belt emergently and clamps the coal conveying belt through a clamping machine, and protects the belt conveyor to run safely.
In order to solve the technical problems, the invention adopts the technical scheme that: fortune coal belt fracture promptly prevents control system, its characterized in that: the coal belt conveyor monitoring device comprises a belt conveyor remote control console, a plurality of prevention and control protection devices and a control box, wherein the prevention and control protection devices are in wireless communication with the belt conveyor remote control console, each prevention and control protection device comprises a detection mechanism for detecting fracture of a coal conveying belt, a clamping machine for preventing fracture of the coal conveying belt and a control box for controlling the detection mechanism and the clamping machine to work, each detection mechanism comprises a metal plate, a vertical rod, a pulley and an eddy current displacement sensor, the metal plate is arranged on a belt conveyor frame and close to an auxiliary roller, one end of the vertical rod is connected to a support through a damping mechanism, the pulley is rotatably installed at the other end of the vertical rod and is in contact with the coal conveying belt, and the eddy current displacement;
the damping mechanism comprises a damping piston cylinder body, a damping piston plate which is arranged in the damping piston cylinder body and drives the vertical rod to lift, and a damping spring which is connected with the damping piston plate and the damping piston cylinder body, wherein a first air pipe for installing an air inlet and exhaust valve and a second air pipe for installing a high-pressure inlet and exhaust valve are arranged on the side wall of the damping piston cylinder body, and the damping piston cylinder body is communicated with the damping high-pressure air cylinder through the second air pipe;
the clamping machine comprises a brake piston cylinder body arranged between an upper belt and a lower belt of the coal conveying belt, a brake piston plate movably arranged in the brake piston cylinder body, and two fixing plates which are fixedly arranged on two sides of the top of the brake piston cylinder body respectively and matched with the brake piston plate to clamp the coal conveying belt, wherein the fixing plates are positioned on the upper side of the upper belt of the coal conveying belt, the bottom of the brake piston cylinder body is communicated with a brake high-pressure cylinder through a connecting pipe, a high-pressure air inlet and outlet valve II is arranged on the connecting pipe, and the brake piston plate is lifted in the brake piston cylinder body through an elastic lifting;
the control box comprises an explosion-proof shell, an electronic circuit board arranged in the explosion-proof shell, and an audible and visual alarm and a display screen which are arranged on the explosion-proof shell, wherein a microcontroller, a power supply, a wireless radio frequency circuit and a memory are integrated on the electronic circuit board, the wireless radio frequency circuit is connected with the microcontroller, the memory is used for storing the distance threshold value between the eddy current displacement sensor and the metal plate, the eddy current displacement sensor is connected with the microcontroller through a signal conditioning circuit, the microcontroller controls the rotation of the rotating shaft through a motor driving module, and the rotating shaft, the audible and visual alarm, the display screen, the air inlet and outlet valve and the high-pressure inlet and outlet valve are all controlled;
the signal conditioning circuit consists of a phase-sensitive detection circuit, a high-precision operational amplifier circuit, a voltage follower circuit and an analog-to-digital conversion circuit which are connected in sequence; the wireless radio frequency circuit is in communication with the belt conveyor remote control console.
Above-mentioned fortune coal belt breakage promptly prevents control system, its characterized in that: the explosion-proof shell is fixed on the bracket through a fixing rod.
Above-mentioned fortune coal belt breakage promptly prevents control system, its characterized in that: the braking piston cylinder body is arranged on the rack of the belt conveyor, and the length of the braking piston cylinder body is not less than the width of the coal conveying belt.
Above-mentioned fortune coal belt breakage promptly prevents control system, its characterized in that: the elastic lifting piece is a hard spring, the number of the hard springs is multiple, one end of each hard spring is fixed to the bottom of the brake piston cylinder, and the other end of each hard spring is fixed to the bottom of the brake piston plate.
The coal belt breakage emergency prevention and control system is characterized in that the phase-sensitive detection circuit comprises an analog multiplier AD L5391, and the high-precision operational amplifier circuit comprises a high-precision operational amplifier OP 07.
Meanwhile, the invention also discloses a method for emergency prevention and control of fracture of the coal conveying belt, which has simple steps and reasonable design and can detect the fracture phenomenon of the coal conveying belt, and is characterized by comprising the following steps:
step one, setting a belt fracture sinking distance threshold: storing a belt fracture and subsidence distance threshold D of the coal conveying belt in a memory, wherein the belt fracture and subsidence distance threshold D is obtained by sensing a metal plate through an eddy current displacement sensor;
step two, initializing a damping mechanism: the microcontroller controls the air inlet and outlet valve to be opened, and simultaneously controls the high-pressure inlet and outlet valve to be closed, so that the initialization of the damping mechanism is realized;
step three, detecting the real-time distance from the eddy current displacement sensor to the metal plate and displaying the real-time distance: the eddy current displacement sensor arranged in the vertical rod is used for sensing the metal plate in real time, the voltage sensed by the eddy current displacement sensor is converted into a real-time distance H after passing through a signal conditioning circuit, and the real-time distance H is displayed by the microcontroller through a display screen;
step four, judging whether the coal conveying belt is broken: the microcontroller compares the real-time distance H with a belt fracture and subsidence distance threshold value D, when H is less than or equal to D, the coal conveying belt is fractured, and the fifth step is executed; otherwise, circulating the step three;
step five, the current prevention and control protection device gives an alarm and locks the coal conveying belt: the prevention and control protection device which detects that H is less than or equal to D in the fourth step is the current prevention and control protection device, a microcontroller in the current prevention and control protection device drives an audible and visual alarm to give an emergency alarm after receiving a digital signal conditioned by a signal conditioning circuit signal, the fracture position of the coal conveying belt is prompted, meanwhile, the microcontroller in the current prevention and control protection device controls an air inlet and exhaust valve to be closed and controls a high-pressure inlet and exhaust valve to be opened, high-pressure gas is rapidly supplied into a damping piston cylinder body through a damping high-pressure cylinder, the coal conveying belt is pressed on a metal plate through a pulley, in addition, the microcontroller in the current prevention and control protection device controls a high-pressure inlet and exhaust valve II connected with the microcontroller to be opened, the braking high-pressure cylinder supplies high-pressure gas to a braking piston cylinder body, and the braking piston plate is pushed to;
step six, fault information transmission: the microcontroller in the prevention and control protection device which detects that H is less than or equal to D in the fourth step sends a fault alarm signal to the remote control console of the belt conveyor through a wireless radio frequency circuit;
seventhly, braking the belt conveyor by the residual prevention and control protection device: the remote control console of the belt conveyor is communicated with the prevention and control protection devices except the current prevention and control protection device, the prevention and control protection devices except the current prevention and control protection device are residual prevention and control protection devices, a microcontroller in the residual prevention and control protection devices drives a high-pressure air inlet and outlet valve II to be opened, and a braking high-pressure air cylinder provides high-pressure air for a braking piston cylinder body to push a braking piston plate to move upwards and tighten a coal conveying belt with a fixed plate;
step eight, comprehensively braking the belt conveyor: the belt conveyor remote control console controls the main roller of the belt conveyor to stop, so that the belt conveyor is comprehensively braked.
The above method is characterized in that: the vertical rod moves on the coal conveying belt through the damping mechanism.
Compared with the prior art, the invention has the following advantages:
1. the emergency prevention and control system is used for determining the distance between the upward belt of the coal conveying belt and the rack of the belt conveyor by setting the eddy current displacement sensor and the metal plate to detect the distance in a matching manner, and the storage device is used for storing the distance threshold value between the upward belt of the coal conveying belt and the rack of the belt conveyor, so that the fracture state of the coal conveying belt is determined, and the emergency prevention and control system is flexible to use and high in applicability; the metal plate can meet the detection of distance, and meanwhile, when the coal conveying belt is broken, the broken coal conveying belt can be locked by matching with the vertical rod, so that the using effect is good, and the popularization and the use are convenient.
2. The emergency prevention and control system has two advantages by arranging the damping mechanisms, is beneficial to playing a buffering role on the coal conveying belt of the belt conveyor when the vertical rod moves up and down, is beneficial to pressing the coal conveying belt when the coal conveying belt of the belt conveyor is broken, protects the belt conveyor at the first time, prevents the coal conveying belt of the belt conveyor from flying and throwing to hurt workers, and is reliable, stable and good in using effect.
3. The emergency prevention and control system adopted by the invention is characterized in that a clamping machine is arranged for each detection mechanism, so that the fracture position of the coal conveying belt is quickly protected, a braking piston cylinder is arranged between an upper belt and a lower belt of the coal conveying belt, a fixing plate is arranged on the upper side of the upper belt of the coal conveying belt, a braking piston plate is arranged on the lower side of the upper belt of the coal conveying belt, the braking piston plate moves upwards and can be matched with the fixing plate to clamp the upper belt of the coal conveying belt, in addition, an elastic lifting piece is arranged at the bottom of the braking piston plate, the extrusion of the overload coal conveying belt on the braking piston plate can be blocked, a buffering effect is realized, meanwhile, the coal conveying belt is supported by the braking piston plate, the running path of the coal conveying belt is limited, the overload running of the coal conveying belt is avoided, the reliability and.
4. The emergency prevention and control method adopted by the invention has simple steps, and through setting the belt fracture and subsidence distance threshold value, when the real-time distance from the detected eddy current displacement sensor to the metal plate is smaller than the belt fracture and subsidence distance threshold value, the coal conveying belt is fractured, the belt conveyor is comprehensively braked, and when the coal conveying belt is fractured, the damping mechanism plays a role in driving the vertical rod to accelerate subsidence, so that the effect is good, and the popularization and the use are convenient.
In conclusion, the belt conveyor is novel and reasonable in design, the fracture information of the coal conveying belt is obtained through the induction of the eddy current displacement sensor and the metal plate, the positioning is accurate, the induction is accurate, the belt conveyor is applicable and reliable, the vertical rods are driven by the damping mechanisms to press the coal conveying belt urgently and clamp the coal conveying belt through the clamping machine, the belt conveyor is protected to run safely, and the belt conveyor is convenient to popularize and use.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an emergency prevention and control system adopted by the present invention.
Fig. 2 is a schematic diagram of the installation relationship between the positions of the clamping machine and the coal conveying belt in the emergency prevention and control system adopted by the invention.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a schematic structural diagram of a shock-absorbing mechanism in the emergency preventive control system adopted in the present invention.
Fig. 5 is an enlarged view of a portion a in fig. 1.
Fig. 6 is a schematic diagram of the circuit connection relationship between the control box, the eddy current displacement sensor and the metal plate in the emergency prevention and control system adopted by the invention.
Fig. 7 is a schematic circuit block diagram of a signal conditioning circuit in an emergency prevention and control system adopted by the present invention.
Fig. 8 is a flow chart of an emergency prevention and control method adopted by the present invention.
Description of reference numerals:
1-control box; 1-a power supply; 1-4-a microcontroller;
1-5-audible and visual alarm; 1-6-display screen; 1-7-radio frequency circuit;
1-8-motor drive module; 1-9-memory; 2, a bracket;
3, vertical rods; 4, a damping mechanism; 4-1-damping high-pressure cylinder;
4-2, a first high-pressure air inlet and outlet valve; 4-3-air intake and exhaust valves; 4-damping spring;
4-5-damping piston plate; 4-6-damping piston cylinder; 5, fixing a rod;
6, a pulley; 7-coal conveying belt; 8, an auxiliary roller;
9-an eddy current displacement sensor; 10-a metal plate; 12-1-fixing plate;
12-2-brake piston plate; 12-3-a resilient lifting member; 12-4-brake high-pressure cylinder;
12-5-brake piston cylinder; 12-6-a high-pressure air inlet and outlet valve II;
14-belt conveyor frame; 20-a signal conditioning circuit;
20-1-phase sensitive detection circuit; 20-2-high precision operational amplifier circuit;
20-3-voltage follower circuit; 20-4-analog-to-digital conversion circuit.
Detailed Description
As shown in fig. 1 to 7, the coal belt breakage emergency prevention and control system according to the present invention comprises a belt conveyor remote control console and a plurality of prevention and control protection devices in wireless communication with the belt conveyor remote control console, wherein each prevention and control protection device comprises a detection mechanism for detecting breakage of a coal belt 7, a clamping machine for preventing breakage of the coal belt 7, and a control box 1 for controlling operation of the detection mechanism and the clamping machine, the detection mechanism comprises a metal plate 10 arranged on a belt conveyor frame 14 close to an auxiliary roller 8, a vertical rod 3 with one end connected to a support 2 through a damping mechanism 4, a pulley 6 rotatably mounted at the other end of the vertical rod 3 and in contact with the coal belt 7, and an eddy current displacement sensor 9 arranged in the vertical rod 3 and matched with the metal plate 10;
it should be noted that the arrangement of the plurality of prevention and control protection devices is to ensure that a plurality of protection points are arranged along the running direction of the coal conveying belt 7 after the coal conveying belt 7 is broken and simultaneously press and protect the coal conveying belt 7, so that a rapid and stable braking effect is achieved, and the phenomenon that a single prevention and control protection device is poor in effect or acts mistakenly to cause no braking effect on the belt conveyor is avoided; each prevention and control protection device corresponds to one auxiliary roller 8, a detection mechanism is arranged for each auxiliary roller 8 to detect the breakage of the coal conveying belt 7 in real time, the vertical movement of the vertical rod 3 drives the eddy current displacement sensor 9 to move up and down and is matched with the metal plate 10 to detect the distance, so that the distance between the upward belt of the coal conveying belt 7 and the belt conveyor frame 14 is determined, and the distance threshold value between the upward belt of the coal conveying belt 7 and the belt conveyor frame 14 is set, so that the breakage state of the coal conveying belt 7 is determined, and the prevention and control protection device is flexible to use and high in applicability; the metal plate 14 is arranged to meet the induction distance at a moment, and is matched with the vertical rod 3 to lock the broken coal conveying belt 7 when the coal conveying belt 7 is broken, so that the use effect is good, and the positioning is quick and accurate; by arranging a clamping machine for each auxiliary roller 8, when the coal conveying belt 7 is broken, the clamping machine clamps the coal conveying belt 7, so that the coal conveying belt 7 is prevented from falling off quickly, and the coal is prevented from splashing to damage equipment and hurt others; meanwhile, the vertical rods 3 are arranged on the side close to each auxiliary roller 8, on one hand, the installation of the vertical rods 3 provides a movable installation foundation for the eddy current displacement sensor 9, on the other hand, the vertical rods are matched with the damping mechanism 4 to press the coal conveying belt 7, and the braking of the belt conveyor is assisted.
The damping mechanism 4 comprises a damping piston cylinder 4-6, a damping piston plate 4-5 which is arranged in the damping piston cylinder 4-6 and drives the vertical rod 3 to lift, and a damping spring 4-4 which is connected with the damping piston plate 4-5 and the damping piston cylinder 4-6, a first air pipe for installing an air inlet and exhaust valve 4-3 and a second air pipe for installing a high-pressure inlet and exhaust valve I4-2 are arranged on the side wall of the damping piston cylinder 4-6, and the damping piston cylinder 4-6 is communicated with a damping high-pressure air cylinder 4-1 through the second air pipe;
it should be noted that the damping mechanisms 4 are arranged for two purposes, firstly, the vertical rods 4 can play a role in buffering the coal conveying belt 7 when moving up and down, secondly, the coal conveying belt 7 can be pressed when being broken, the belt conveyor is protected for the first time, workers are prevented from being injured by flying and swinging the coal conveying belt 7, when the coal conveying belt 7 works normally, the vertical rods 3 move up and down, the pulleys 6 are installed at the lower ends of the vertical rods 3, the pulleys 6 are in contact with the coal conveying belt 7, the pulleys 6 keep rolling, so that the friction force between the coal conveying belt 7 and the vertical rods 3 is reduced, the abrasion degree of the coal conveying belt 7 is also reduced, and the air inlet and outlet valves 4-3 are arranged to ensure that air can freely enter and exit from the damping piston cylinder bodies 4-6 when the coal conveying belt 7 works normally, so as to realize the buffering of up and down movement of the; when the coal conveying belt 7 is broken, the vertical rod 3 sinks due to self weight, the eddy current displacement sensor 9 moves downwards, the microcontroller 1-4 drives the high-pressure air inlet and outlet valve 4-2, high-pressure air of the damping high-pressure air cylinder 4-1 rushes into the damping piston cylinder body 4-6, the damping piston plate 4-5 is pushed downwards, the damping spring 4-4 is stretched, the vertical rod 3 moves downwards and abuts against the metal plate 10, and the coal conveying belt 7 can be locked.
The clamping machine comprises a brake piston cylinder body 12-5 arranged between an upper belt and a lower belt of the coal conveying belt 7, a brake piston plate 12-2 movably arranged in the brake piston cylinder body 12-5, and two fixing plates 12-1 which are fixedly arranged on two sides of the top of the brake piston cylinder body 12-5 respectively and are matched with the brake piston plate 12-2 to clamp the coal conveying belt 7, wherein the fixing plates 12-1 are positioned on the upper side of the upper belt of the coal conveying belt 7, the bottom of the brake piston cylinder body 12-5 is communicated with a brake high-pressure cylinder 12-4 through a connecting pipe, a high-pressure air inlet and outlet valve II 12-6 is arranged on the connecting pipe, and the brake piston plate 12-2 is lifted in the brake piston cylinder body 12-5 through an elastic lifting part 12-3;
in this embodiment, the elastic lifting member 12-3 is a plurality of hard springs, one end of each hard spring is fixed to the bottom of the brake piston cylinder 12-5, and the other end of each hard spring is fixed to the bottom of the brake piston plate 12-2.
In the embodiment, the braking piston cylinder 12-5 is installed on the belt conveyor frame 14, and the length of the braking piston cylinder 12-5 is not less than the width of the coal conveying belt 7.
It should be noted that, in practical use, the braking piston cylinder 12-5 is a cubic structure, the length of the braking piston cylinder 12-5 is not less than the width of the coal belt 7 in order to ensure that the upward belt of the coal belt 7 can be completely placed in the middle position of the top of the braking piston cylinder 12-5, the braking piston plate 12-2 is movably installed in the braking piston cylinder 12-5, the length of the braking piston plate 12-2 is greater than the width of the coal belt 7, the braking piston plate 12-2 cooperates with the fixing plates 12-1 installed on both sides of the top of the braking piston cylinder 12-5 to clamp the coal belt 7, the braking piston plate 12-2 is lifted in the braking piston cylinder 12-5 through the elastic lifting member 12-3 for two purposes, firstly, when the braking piston plate 12-2 moves upwards, in order to prevent the fixed plate 12-1 from being collided by overlarge impact force, the elastic lifting piece 12-3 generates pulling force on the brake piston plate 12-2, the higher the upward movement of the brake piston plate 12-2 is, the higher the pulling force of the elastic lifting piece 12-3 is, the more high-pressure gas enters the brake piston cylinder body 12-5 by the brake high-pressure cylinder 12-4, so that stable supporting force is provided for the brake piston plate 12-2, and the pulling force of the elastic lifting piece 12-3 is counteracted; secondly, when the brake piston plate 12-2 moves downwards, the brake piston plate 12-2 is rapidly descended by the self gravity of the brake piston plate 12-2, the tension of the elastic lifting piece 12-3 and rapidly depressurized gas, and in order to prevent the brake piston plate 12-2 from colliding with the bottom plate of the brake piston cylinder 12-5, the elastic lifting piece 12-3 generates upward elastic force along with the descending of the height of the brake piston plate 12-2 to form a buffer to the brake piston plate 12-2, in order to ensure the stability of the brake piston plate 12-2, the elastic lifting piece 12-3 adopts hard springs, the expansion effect is good, the number of the hard springs is multiple, and the hard springs are jointly connected with the brake piston plate 12-2, so that the stability is enhanced.
The control box 1 comprises an explosion-proof shell, an electronic circuit board arranged in the explosion-proof shell, and audible and visual alarms 1-5 and a display screen 1-6 which are arranged on the explosion-proof shell, the electronic circuit board is integrated with a microcontroller 1-4, a power supply 1-1, a wireless radio frequency circuit 1-7 and a memory 1-9, wherein the wireless radio frequency circuit 1-7 is connected with the microcontroller 1-4, the memory 1-9 is used for storing a distance threshold between an eddy current displacement sensor 9 and a metal plate 10, the eddy current displacement sensor 9 is connected with the microcontroller 1-4 through a signal conditioning circuit 20, the microcontroller 1-4 controls a rotating shaft 13-4 to rotate through a motor driving module 1-8, and the rotating shaft 13-4, an acousto-optic alarm 1-5, a display screen 1-6, an air inlet and exhaust valve 4-3 and a high-pressure inlet and exhaust valve I4-2 are controlled by the microcontroller 1-4;
in this embodiment, the explosion-proof housing is fixed to the bracket 2 by a fixing rod 5.
It should be noted that the underground environment is complex and severe, explosion-proof safety is the first problem to be solved for underground equipment, the explosion-proof housing is arranged to ensure the use safety of the electric equipment in the control box 1 and avoid the ignition spark of the electric equipment in the control box 1 from threatening underground coal mine, the audible and visual alarm 1-5 is arranged to send out alarm signals timely after the coal conveying belt 7 is broken, the breakage of the coal conveying belt 7 and the breakage position of the coal conveying belt 7 are informed in the first time, the signal conditioning circuit 20 transmits signals to the microcontrollers 1-4 in real time, and each microcontroller 1-4 is in a monitoring state in real time.
It should be noted that the eddy current displacement sensor 9 is an electronic device that outputs a voltage signal, when the distance between the eddy current displacement sensor 9 and the metal plate 10 is close, the surface of the metal plate 10 receives the high-frequency oscillation energy in the eddy current displacement sensor 9, so that the output amplitude of the oscillator in the eddy current displacement sensor 9 is linearly attenuated, the distance is detected in a non-contact manner, the eddy current displacement sensor 9 is not affected by dust in the well when working, the service life is long, and the eddy current displacement sensor is very suitable for being used in a severe environment in the coal mine.
The signal conditioning circuit 20 consists of a phase sensitive detection circuit 20-1, a high-precision operational amplifier circuit 20-2, a voltage follower circuit 20-3 and an analog-to-digital conversion circuit 20-4 which are connected in sequence; radio frequency circuits 1-7 communicate with the belt conveyor remote control station.
It should be noted that the phase-sensitive detection circuit 20-1 is provided to remove the high-frequency noise of the signal of the eddy current displacement sensor 9, extract the effective signal, and perform the effect of low-pass filtering; the high-precision operational amplifier circuit 20-2 is arranged for effectively amplifying the weak signal acquired by the phase-sensitive detection circuit 20-1, so as to facilitate post-processing; the voltage follower circuit 20-3 is configured to stably maintain the amplified voltage signal and provide a stable and reliable voltage value.
In this embodiment, the phase-sensitive detector circuit 20-1 includes an analog multiplier AD L5391, and the high-precision operational amplifier circuit 20-2 includes a high-precision operational amplifier OP 07.
It should be noted that the analog multiplier AD L5391 can work in an environment with a temperature range of-40 ℃ to +85 ℃ to meet the actual downhole working requirement.
Fig. 8 shows an emergency prevention and control method for breakage of a coal belt, which comprises the following steps:
step one, setting a belt fracture sinking distance threshold: storing a belt fracture and subsidence distance threshold value D of the coal conveying belt 7 in a memory 1-9, wherein the belt fracture and subsidence distance threshold value D is obtained by sensing a metal plate 10 through an eddy current displacement sensor 9;
step two, initializing a damping mechanism: the microcontroller 1-4 controls the air inlet and exhaust valve 4-3 to be opened, and meanwhile, the microcontroller 1-4 controls the high-pressure air inlet and exhaust valve 4-2 to be closed, so that the initialization of the damping mechanism 4 is realized;
it should be noted that the purpose of initializing the damping mechanism is to ensure that the air inlet and outlet valve 4-3 naturally conveys air to the damping piston cylinder 4-6 when the coal conveying belt 7 normally runs, and plays a role in buffering the vertical rod 3 from moving up and down, and the high-pressure inlet and outlet valve 4-2 is closed, so that the cost is saved, the safety and the reliability are realized, and the high-pressure inlet and outlet valve 4-2 is started only when the coal conveying belt 7 is broken, so that the control is simple.
Step three, detecting the real-time distance from the eddy current displacement sensor to the metal plate and displaying the real-time distance: the real-time distance H is displayed by the microcontroller 1-4 through the display screen 1-6;
step four, judging whether the coal conveying belt is broken: the microcontroller 1-4 compares the real-time distance H with a belt fracture and subsidence distance threshold value D, when the H is less than or equal to the D, the coal conveying belt 7 is fractured, and the fifth step is executed; otherwise, circulating the step three;
in this embodiment, the vertical rod 3 moves on the coal belt 7 through the damping mechanism 4.
Step five, the current prevention and control protection device gives an alarm and locks the coal conveying belt: the prevention and control protection device which detects that H is less than or equal to D is the current prevention and control protection device, a microcontroller 1-4 in the current prevention and control protection device drives an acousto-optic alarm 1-5 to give an emergency alarm after receiving a digital signal which is conditioned by a signal conditioning circuit 20, the fracture position of the coal conveying belt 7 is prompted, meanwhile, the microcontroller 1-4 in the current prevention and control protection device controls an air inlet and exhaust valve 4-3 to be closed and controls a high-pressure inlet and exhaust valve I4-2 to be opened, high-pressure gas is rapidly provided for a damping piston cylinder body 4-6 through a damping high-pressure cylinder 4-1, the coal conveying belt 7 is pressed on a metal plate 20 through a pulley 6, in addition, the microcontroller 1-4 in the current prevention and control protection device controls a high-pressure inlet and exhaust valve II 12-6 connected with the microcontroller to be opened, the braking high-pressure cylinder 12-4 provides high-pressure gas for a braking piston cylinder body 12-, the brake piston plate 12-2 is pushed to move upwards to tighten the coal conveying belt 7 with the fixed plate 12-1;
it should be noted that, once the microcontroller 1-4 receives the digital signal conditioned by the signal conditioning circuit 20, it is determined that the coal transporting belt 7 is broken at this position, and the microcontroller 1-4 rapidly controls the brake piston plate 12-2 to cooperate with the fixed plate 12-1, so that the current prevention and control protection device can hold the coal transporting belt, the brake piston plate 12-2 and the fixed plate 12-1 define a path for the coal transporting belt 7 to deform and fall, and the fall of the coal transporting belt 7 is prolonged, so that it is effective to control the current prevention and control protection device to hold the coal transporting belt 7, and the current prevention and control protection device directly controls the damping mechanism 4 through the microcontroller 1-4 to drive the vertical rod 3 to press the broken end of the coal transporting belt 7, so that the speed is fast, and the real-time effect is good.
Step six, fault information transmission: in the fourth step, the microcontroller 1-4 in the prevention and control protection device which detects that H is less than or equal to D sends a fault alarm signal to a remote control console of the belt conveyor through a wireless radio frequency circuit 1-7;
seventhly, braking the belt conveyor by the residual prevention and control protection device: the remote control console of the belt conveyor is communicated with the prevention and control protection devices except the current prevention and control protection device, the prevention and control protection devices except the current prevention and control protection device are residual prevention and control protection devices, a microcontroller 1-4 in the residual prevention and control protection devices drives a high-pressure air inlet and outlet valve II 12-6 to be opened, and a brake high-pressure air cylinder 12-4 provides high-pressure air for a brake piston cylinder body 12-5 to push a brake piston plate 12-2 to move upwards and tighten a coal conveying belt 7 with a fixed plate 12-1;
it should be noted that the residual prevention and control protection device only needs to control the operation of the damage protection mechanism, and meanwhile, the vertical rod 3 in the residual prevention and control protection device does not need to sink and press the coal conveying belt 7 to avoid the conflict with the clamping of the coal conveying belt 7 by the damage protection mechanism, and because the damage protection mechanism clamps the coal conveying belt 7 between two adjacent rollers, the part of the coal conveying belt 7 between the two adjacent rollers can be approximately kept horizontal to avoid the coal loaded on the coal conveying belt 7 from falling, and when the vertical rod 3 presses the coal conveying belt 7 on the metal plate 10, the part of the coal conveying belt 7 is too inclined, so that the coal is easy to fall off, therefore, the vertical rod 3 is driven to act only through the damping mechanism 4 in the current prevention and control protection device, and the high-pressure inlet exhaust valve I4-2 in the residual prevention and control protection device is simple to control and good in effect.
Step eight, comprehensively braking the belt conveyor: the belt conveyor remote control console controls the main roller of the belt conveyor to stop, so that the belt conveyor is comprehensively braked.
When the invention is used, the belt conveyor remote control console controls the main roller of the belt conveyor to stop, and as the coal conveying belt 7 has long conveying distance and the main roller stops for a long time, the belt conveyor cannot be quickly and effectively braked, a plurality of prevention and control protection devices are adopted to be matched for use, so that the comprehensive braking of the belt conveyor is realized.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. Fortune coal belt fracture promptly prevents control system, its characterized in that: the coal conveying belt monitoring device comprises a belt conveyor remote control console and a plurality of prevention and control protection devices which are in wireless communication with the belt conveyor remote control console, wherein each prevention and control protection device comprises a detection mechanism used for detecting fracture of a coal conveying belt (7), a clamping machine used for preventing fracture of the coal conveying belt (7) and a control box (1) used for controlling the detection mechanism and the clamping machine to work, the detection mechanism comprises a metal plate (10) which is arranged on a belt conveyor rack (14) close to an auxiliary roller (8), a vertical rod (3) of which one end is connected onto a support (2) through a damping mechanism (4), a pulley (6) which is rotatably arranged at the other end of the vertical rod (3) and is in contact with the coal conveying belt (7) and an electric eddy current displacement sensor (9) which is arranged in the vertical rod (3) and is matched with the metal plate (10);
the damping mechanism (4) comprises a damping piston cylinder body (4-6), a damping piston plate (4-5) which is arranged in the damping piston cylinder body (4-6) and drives the vertical rod (3) to lift, and a damping spring (4-4) which is connected with the damping piston plate (4-5) and the damping piston cylinder body (4-6), a first air pipe for installing the air inlet and exhaust valve (4-3) and a second air pipe for installing the high-pressure inlet and exhaust valve I (4-2) are arranged on the side wall of the damping piston cylinder body (4-6), and the damping piston cylinder body (4-6) is communicated with the damping high-pressure air cylinder (4-1) through the second air pipe;
the clamping machine comprises a brake piston cylinder body (12-5) arranged between an upper belt and a lower belt of the coal conveying belt (7), a brake piston plate (12-2) movably arranged in the brake piston cylinder body (12-5), and two fixing plates (12-1) which are respectively fixedly arranged on two sides of the top of the brake piston cylinder body (12-5) and matched with the brake piston plate (12-2) to clamp the coal conveying belt (7), wherein the fixing plates (12-1) are positioned on the upper side of the upper belt of the coal conveying belt (7), the bottom of the brake piston cylinder body (12-5) is communicated with a brake high-pressure cylinder (12-4) through a connecting pipe, a second high-pressure air inlet and outlet valve (12-6) is arranged on the connecting pipe, and the brake piston plate (12-2) is lifted in the brake piston cylinder body (12-5) through an elastic lifting piece (12-3);
the control box (1) comprises an explosion-proof shell, an electronic circuit board arranged in the explosion-proof shell, and an audible and visual alarm (1-5) and a display screen (1-6) which are arranged on the explosion-proof shell, wherein a microcontroller (1-4), a power supply (1-1), a wireless radio frequency circuit (1-7) and a memory (1-9) are integrated on the electronic circuit board, the wireless radio frequency circuit (1-7) is connected with the microcontroller (1-4), the memory (1-9) is used for storing a distance threshold value between an eddy current displacement sensor (9) and a metal plate (10), the eddy current displacement sensor (9) is connected with the microcontroller (1-4) through a signal conditioning circuit (20), the microcontroller (1-4) controls a rotating shaft (13-4) to rotate through a motor driving module (1-8), and the rotating shaft (13-4) is arranged on the explosion-, The acousto-optic alarm (1-5), the display screen (1-6), the air inlet and exhaust valve (4-3) and the high-pressure air inlet and exhaust valve I (4-2) are controlled by the microcontroller (1-4);
the signal conditioning circuit (20) consists of a phase sensitive detection circuit (20-1), a high-precision operational amplifier circuit (20-2), a voltage follower circuit (20-3) and an analog-to-digital conversion circuit (20-4) which are connected in sequence; the wireless radio frequency circuits (1-7) are communicated with the belt conveyor remote control console;
the elastic lifting piece (12-3) is a plurality of hard springs, one end of each hard spring is fixed to the bottom of the brake piston cylinder body (12-5), and the other end of each hard spring is fixed to the bottom of the brake piston plate (12-2).
2. The coal belt breakage emergency prevention and control system of claim 1, wherein: the explosion-proof shell is fixed on the bracket (2) through a fixing rod (5).
3. The coal belt breakage emergency prevention and control system of claim 1, wherein: the brake piston cylinder body (12-5) is arranged on a rack (14) of the belt conveyor, and the length of the brake piston cylinder body (12-5) is not less than the width of the coal conveying belt (7).
4. The emergency coal belt breakage prevention and control system as set forth in claim 1, wherein the phase-sensitive detector circuit (20-1) comprises an analog multiplier AD L5391, and the high-precision operational amplifier circuit (20-2) comprises a high-precision operational amplifier OP 07.
5. A method for emergency prevention and control of belt breakage using the system of claim 1, wherein: the method comprises the following steps:
step one, setting a belt fracture sinking distance threshold: storing a belt fracture and subsidence distance threshold D of the coal conveying belt (7) in a memory (1-9), wherein the belt fracture and subsidence distance threshold D is obtained by sensing a metal plate (10) through an eddy current displacement sensor (9);
step two, initializing a damping mechanism: the microcontroller (1-4) controls the air inlet and exhaust valve (4-3) to be opened, and the microcontroller (1-4) controls the high-pressure air inlet and exhaust valve (4-2) to be closed at the same time, so that the initialization of the damping mechanism (4) is realized;
step three, detecting the real-time distance from the eddy current displacement sensor to the metal plate and displaying the real-time distance: the real-time distance H is displayed by the microcontroller (1-4) through the display screen (1-6), the electric vortex displacement sensor (9) arranged in the vertical rod (3) senses the metal plate (10) in real time, the voltage sensed by the electric vortex displacement sensor (9) is converted into the real-time distance H after passing through the signal conditioning circuit (20);
step four, judging whether the coal conveying belt is broken: the microcontroller (1-4) compares the real-time distance H with a belt fracture and subsidence distance threshold value D, when the H is less than or equal to the D, the coal conveying belt (7) is fractured, and the fifth step is executed; otherwise, circulating the step three;
step five, the current prevention and control protection device gives an alarm and locks the coal conveying belt: the prevention and control protection device which detects that H is less than or equal to D is the current prevention and control protection device, a microcontroller (1-4) in the current prevention and control protection device receives a digital signal conditioned by a signal conditioning circuit (20) and then drives an audible and visual alarm (1-5) to give an emergency alarm to prompt the fracture position of the coal conveying belt (7), meanwhile, the microcontroller (1-4) in the current prevention and control protection device controls an air inlet and exhaust valve (4-3) to be closed and controls a high-pressure inlet and exhaust valve I (4-2) to be opened, high-pressure gas is rapidly provided for a damping piston cylinder body (4-6) through a damping high-pressure cylinder (4-1), the coal conveying belt (7) is pressed on a metal plate (20) through a pulley (6), in addition, the microcontroller (1-4) in the current prevention and control protection device controls a high-pressure inlet and exhaust valve II (12-6) connected with the microcontroller to be opened, the brake high-pressure cylinder (12-4) provides high-pressure gas for the brake piston cylinder body (12-5) to push the brake piston plate (12-2) to move upwards and tighten the coal conveying belt (7) with the fixed plate (12-1);
step six, fault information transmission: in the fourth step, a microcontroller (1-4) in the prevention and control protection device which detects that H is less than or equal to D sends a fault alarm signal to a remote console of the belt conveyor through a wireless radio frequency circuit (1-7);
seventhly, braking the belt conveyor by the residual prevention and control protection device: the belt conveyor remote control console communicates with the prevention and control protection devices except the current prevention and control protection device, the prevention and control protection devices except the current prevention and control protection device are residual prevention and control protection devices, microcontrollers (1-4) in the residual prevention and control protection devices drive high-pressure air inlet and outlet valves II (12-6) to be opened, and braking high-pressure air cylinders (12-4) provide high-pressure air for braking piston cylinder bodies (12-5) to push braking piston plates (12-2) to move upwards and tighten coal conveying belts (7) with fixed plates (12-1);
step eight, comprehensively braking the belt conveyor: the belt conveyor remote control console controls the main roller of the belt conveyor to stop, so that the belt conveyor is comprehensively braked.
6. The method of claim 5, wherein: the vertical rod (3) moves on the coal conveying belt (7) through the damping mechanism (4).
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| CN201710643939.3A CN107244538B (en) | 2017-07-31 | 2017-07-31 | Emergency prevention and control system and method for coal conveying belt fracture |
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| CN201710643939.3A CN107244538B (en) | 2017-07-31 | 2017-07-31 | Emergency prevention and control system and method for coal conveying belt fracture |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320457A (en) * | 2011-08-23 | 2012-01-18 | 北京纵横兴业科技发展有限公司 | Intelligent monitoring system for monitoring coal conveying belt for of coal conveying system |
| CN105398776A (en) * | 2015-11-18 | 2016-03-16 | 山东钢铁股份有限公司 | Broken belt grabbing device for belt conveyor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320457A (en) * | 2011-08-23 | 2012-01-18 | 北京纵横兴业科技发展有限公司 | Intelligent monitoring system for monitoring coal conveying belt for of coal conveying system |
| CN105398776A (en) * | 2015-11-18 | 2016-03-16 | 山东钢铁股份有限公司 | Broken belt grabbing device for belt conveyor |
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