System for removing blockage of coal bunker of coal mine and preventing gas at upper bunker opening of coal bunker from exceeding limit

Abstract

The invention discloses a system for removing blockage of a coal bunker and preventing gas at an upper bunker opening of the coal bunker from exceeding limit. Comprising a peeping camera device, a center suspension vibration rod device, a pre-buried hydraulic alligator plate device, a suspension high-pressure water washing dredging spraying device, a gravity sensing type coal feeder device, an air cannon device, a pre-buried ventilation pipeline automatic starting mechanical ventilation device and a large coal gangue circulating cleaning device. The problems of blockage, arching, wall sticking and the like of the coal bunker are solved, production interruption caused by blockage of the coal bunker is reduced, neck pinching caused by blockage of the coal bunker is avoided, production continuity is guaranteed, production cost is reduced, labor intensity of workers is relieved, safety of the workers is guaranteed, and working efficiency is improved; and the gas sensor gas over-limit alarm accident of the upper bin opening caused by wind current short circuit is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine production, and in particular relates to a system for clearing and blocking coal bunkers in coal mines for sizing and preventing gas from exceeding a limit at an upper bunker opening of the coal bunker. Background Art

[0002] The underground coal bunker in a coal mine is an important part in the process of coal production and transportation. It can ensure the normal operation of transportation in the mining area and the main tunnel, and play the role of a regulating unit in the transportation process, improving the reliability of the underground transportation system. The underground coal bunker is a key link in stabilizing mine production, changing the direction of coal flow, storing coal, and loading coal. It can play a positive role in ensuring the quality of coal products and regulating the imbalance of coal production in the working face.

[0003] During the storage process, the raw coal in the coal bunker will adhere to the inner wall of the coal bunker or near the lower bunker opening due to the influence of factors such as water content, temperature and the effect of expansive minerals, resulting in a reduction in the usable volume of the coal bunker or even blockage. After a bunker blockage accident occurs, all production systems upstream of the coal bunker need to stop working and wait for the coal bunker to be unblocked, which has a significant adverse impact on the economic production of the mine; at the same time, the complex environment, long working cycle and high risk during the coal bunker cleaning process can easily cause safety incidents such as gas exceeding the limit and casualties. Therefore, coal bunker blockage has become a problem that plagues coal safety and economic production.

[0004] Gas in coal bunkers comes from gas desorbed from raw coal. Coal bunker gas control is an important coal mine safety management task. Its main purpose is to prevent gas accumulation in coal bunkers and avoid gas over-limit accidents. The gas sensor of coal bunkers is generally hung at the upper bunker entrance of coal bunkers, and the real-time monitoring data of the gas sensor is incorporated into the mine monitoring system.

[0005] The gas sensor over-limit alarm event at the upper port of the coal bunker includes the following two situations: 1. Under normal circumstances, ventilation of the upper opening of the coal bunker is carried out through natural wind pressure ventilation through the ventilation pipes pre-buried during the construction of the coal bunker to dilute the gas concentration at the upper opening. The wind flow route is the coal bunker lower opening tunnel → pre-buried ventilation pipe → coal bunker upper opening. When the gas content of the raw coal is large, it causes gas overflow in the bunker and causes the bunker opening to exceed the limit. In addition, the traditional clearing method of air cannon compressed air vibration method will cause gas disturbance in the bunker, and the remaining gas will be discharged from the upper opening, causing gas to exceed the limit.

[0006] 2. During the coal unloading process at the lower opening of the coal bunker, since there is no bunker position indication device, the coal unloading personnel may easily empty the coal bunker based on their experience, resulting in a short circuit in the coal bunker airflow, causing gas disturbance in the coal bunker to surge upward and cause gas at the upper bunker opening to exceed the limit.

[0007] The traditional method of clearing coal bunker blockage is to place a certain number of compressed air tanks at the bottom of the coal bunker, and use air cannons to instantly release compressed air to generate shock waves, causing disturbance and damage to the blockage. Alternatively, workers wear safety belts and enter the bunker from the top of the coal bunker or the inspection port to use pneumatic picks to remove it, or "fire blasters" on the surface of the blockage to cause disturbance and damage to the blockage.

[0008] Disadvantages of traditional cleaning methods: After the coal bunker is blocked, the air cannon vibration cleaning method is adopted. The air disturbance of the air cannon can easily cause the over-limit gas to flow to the gas sensor at the upper bunker mouth, causing a gas over-limit accident and affecting the normal production of the mine; the disturbance generated by the air cannon is limited and is only suitable for the blockage of loose bodies; the raw coal contains moisture and cemented soft rock. The blockage body has been solidified by water and muddy soft rock and has a certain strength. The air cannon cannot be effectively cleaned, or large pieces will continue to block the lower bunker mouth after cleaning, and the purpose of effective cleaning cannot be achieved; manual cleaning is currently used by many production mines, but there are serious safety hazards and low cleaning efficiency. The vertical height of the coal bunker is 10m-30m. Manual cleaning of the coal bunker requires personnel to work above and below the blocking body at high altitude. The instantaneous destruction of the blocking body can easily cause personnel to be buried. At the same time, the falling of equipment, chute cast stone, concrete wall, etc. in the bunker will cause the risk of personnel being smashed, and the physical and mental health of personnel entering the confined space will be threatened. In order to improve the efficiency of clearing blockages, some mines illegally use blasting to clear large-scale blockages. Blasting in coal bunkers is a special environment blasting. Due to factors such as gas accumulation in the bunker, coal bunker structural safety, and difficulty in ensuring the quality of drilling and filling, blasting in the bunker requires the use of the highest level of Class 5 safety explosives. Some mines do not meet the conditions for blasting in the bunker and use blasting to clear blockages, using major safety hazards to solve safety hazards, which is easy to cause major safety incidents. Summary of the invention

[0009] In order to solve the above technical problems existing in the prior art, the present invention provides a comprehensive, all-round, more automated, less labor-intensive, safer and more reliable coal mine bunker clearing and coal bunker upper entrance gas over-limit prevention system.

[0010] In order to solve the above technical problems, the present invention adopts the following technical solutions: a coal mine coal bunker clearing and preventing coal bunker upper bunker gas overrun system, including a peep camera device, a central suspension vibrating rod device, a pre-buried hydraulic crocodile plate device, a suspended high-pressure water flushing and dredging spray device, a gravity sensing coal feeder device, an air cannon device, a pre-buried ventilation pipeline automatic start mechanical ventilation device and a circulation cleaning device for large pieces of coal gangue; The coal bunker is provided with a reserved observation hole at the coal bunker inspection platform, and a hole cover is provided at the reserved observation hole. The peep camera device peeks and photographs the inside of the coal bunker through the reserved observation hole; The central suspension vibrating rod device is arranged along the vertical center line of the coal bunker, the upper end of the central suspension vibrating rod device is suspended and connected to the maintenance I-beam above the upper bunker opening, and the lower end of the central suspension vibrating rod device is connected to the upper end of the coal distributor arranged at the center of the lower bunker opening; The embedded hydraulic crocodile plate device is arranged on the left and right sides of the lower part of the hyperbolic closing funnel structure above the lower warehouse opening; The suspended high-pressure water flushing and dredging spray device is installed on the maintenance I-beam of the upper warehouse belt conveyor head chamber above the upper warehouse opening; The feeding end of the gravity-sensing coal feeder device is arranged just below the lower bin opening; The air cannon devices are installed on the left and right sides of the coal bunker maintenance platform and on the front and rear sides of the hyperbolic closing funnel structure above the lower bunker opening; The upper compartment opening is set at the air outlet of the pre-buried ventilation pipeline to automatically start the mechanical ventilation device; The circulating cleaning device for large coal gangue is installed at the upper storage opening.

[0011] The peep camera device includes a peep rod, one end of which is equipped with a camera. The peep rod is used to pass through a reserved observation hole and extend into the coal bunker to peek at the internal blockage situation. If the reserved observation hole is blocked, the peep rod and the camera are used through the upper bunker opening to observe the internal situation of the coal bunker.

[0012] The centrally suspended vibrating rod device comprises a vertically arranged steel pipe, the upper end of which is connected to the maintenance I-beam by a flexible sling, the lower end of which is connected to the upper end of the coal distributor by a flexible rope, a number of vibrating rods are evenly arranged in the middle and lower part of the steel pipe along the height direction, and a number of linkage rods are evenly arranged on the outer circle of the steel pipe.

[0013] The embedded hydraulic crocodile plate device includes a movable crocodile plate and a reciprocating telescopic hydraulic cylinder. A mounting hole is opened on the lower side wall of the hyperbolic closing funnel structure. The movable crocodile plate is assembled in the mounting hole and closes the mounting hole. The upper side of the movable crocodile plate is connected to the upper side of the mounting hole through a hinge, and the outer side of the lower part of the movable crocodile plate is hinged to the telescopic rod of the reciprocating telescopic hydraulic cylinder.

[0014] The suspended high-pressure water flushing and unblocking spray device includes a small winch and a suspension sheave installed on the maintenance I-beam. The suspension wire rope wound on the small winch passes around the suspension sheave. The movable end of the suspension wire rope is connected to a protective cover. The protective cover is a diamond cone structure or a spherical structure. A plurality of nozzles are provided on the protective cover. The suspension wire rope is connected in parallel with a high-pressure water pipe. The lower end of the high-pressure water pipe extends into the protective cover and is connected to the water inlets of a plurality of nozzles.

[0015] The gravity-sensing coal feeder device includes a weighing coal feeder and a belt conveyor. The feed port of the weighing coal feeder is connected to the lower bin port, and the feed end of the belt conveyor is located directly below the discharge port of the weighing coal feeder. The weighing coal feeder is provided with a gravity sensor for monitoring the amount of coal in the lower bin port of the coal bin.

[0016] The pre-buried ventilation pipeline automatically starts the mechanical ventilation device, which includes a ventilation pipe and a pressure-type ventilator. The pressure-type ventilator is installed on the coal bunker maintenance platform. The pressure-type ventilator is linked to the gas sensor installed on the upper bunker opening. The ventilation pipe is arranged in the bedrock groove outside the coal bunker. The ventilation pipe is pre-buried in the groove cut out of the bedrock. The lower end of the ventilation pipe is connected to the air outlet of the pressure-type ventilator, and the upper end of the ventilation pipe extends to the upper bunker belt machine head chamber above the upper bunker opening.

[0017] The device for circulating and cleaning large pieces of coal gangue includes an anti-falling grate, a vibrating screen plate, a gravity sensor, a suspended belt conveyor, a first scraper conveyor, a second scraper conveyor, a crusher and a chute device. The anti-falling grate is laid at the upper warehouse opening, and the vibrating screen plate is tilted and arranged directly above the anti-falling grate with a low front and a high rear. The rear end of the upper warehouse belt lane is connected to the front end of the upper warehouse belt machine head chamber. The suspended belt conveyor, the first scraper conveyor, the second scraper conveyor, the crusher and the chute device are arranged in the upper warehouse belt lane. The suspended belt conveyor is connected to the upper warehouse belt conveyor. A number of hanging steel ropes are arranged between the top plates of the belt lanes. The lower end of the front side of the vibrating screen plate is connected with the feed end of the first scraper conveyor. The gravity sensor is arranged at the feed end of the rear side of the first scraper conveyor. The first scraper conveyor and the second scraper conveyor are located below the suspended belt conveyor. The front discharge end of the first scraper conveyor is connected with the feed port of the crusher. The discharge port of the crusher is located above the rear feed end of the second scraper conveyor. The front discharge end of the second scraper conveyor is connected with the suspended belt conveyor through a chute device.

[0018] By adopting the above technical solution, compared with the prior art, the present invention has the following beneficial effects: 1) It solves the problems of coal bunker jam, arch formation, and wall sticking, reduces production interruptions caused by coal bunker blockage, avoids bunker blockage from becoming a "choke point" in production, and ensures production continuity.

[0019] 2) It prevents workers from entering the coal bunker to carry out cleaning operations, reduces production costs, reduces the labor intensity of workers, ensures the safety of workers, and improves work efficiency.

[0020] 3) The gravity sensor of the gravity-sensing coal feeder device installed at the lower bin port detects that the amount of coal in the lower bin port is within the set threshold range and issues a command for the belt conveyor to stop working. This can avoid the airflow short-circuit problem caused by the emptying of the coal bin, and at the same time avoid the gas over-limit alarm accident of the gas sensor at the upper bin port caused by the airflow short-circuit.

[0021] 4) The large-piece gangue recycling cleaning device can cyclically crush large pieces of gangue to avoid blockage caused by large pieces of gangue in the coal blocks transported to the upper warehouse by the suspended belt conveyor. There is no need to manually clean the upper warehouse, which can reduce labor intensity, be safer and more reliable, and greatly improve efficiency.

[0022] 5) The pre-buried ventilation pipeline is set up with natural ventilation + mechanical ventilation. When the monitoring value of the warehouse gas sensor is greater than 1.2%, the pre-buried ventilation pipeline is forced to start and the pressure fan of the mechanical ventilation device is automatically started to avoid the gas over-limit alarm accident of the upper warehouse gas sensor caused by the fluctuation of the gas content of the raw coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Middle AA section view; Figure 3 yes Figure 1 Enlarged view of middle part B; Figure 4 yes Figure 3 Side view of the mid-suspension high-pressure water flushing and dredging spray device; Figure 5 yes Figure 4 Top or bottom view of the middle protective cover Figure 6 yes Figure 2 Middle CC section view; Figure 7 yes Figure 2 Middle DD section view. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0025] like Figure 1-Figure 7 As shown, a coal mine bunker blockage clearing and coal bunker upper port gas overrun prevention system of the present invention comprises a peep camera device, a central suspension vibrating rod device, a pre-buried hydraulic crocodile plate device, a suspended high-pressure water flushing and dredging spray device, a gravity sensing coal feeder device, an air cannon device 1, a pre-buried ventilation pipeline automatic start mechanical ventilation device and a circulation cleaning device for large coal gangue; The coal bunker 2 is provided with a reserved observation hole 4 at the coal bunker inspection platform 3, and a hole cover is provided at the reserved observation hole 4. The peep camera device peep-peep-cameras the interior of the coal bunker 2 through the reserved observation hole 4; The central suspension vibrating rod device is arranged along the vertical center line of the coal bunker 2, the upper end of the central suspension vibrating rod device is suspended and connected to the maintenance I-beam 6 above the upper bunker opening 5, and the lower end of the central suspension vibrating rod device is connected to the upper end of the coal distributor 8 arranged at the center of the lower bunker opening 7; The embedded hydraulic crocodile plate device is arranged on the left and right sides of the lower part of the hyperbolic closing funnel structure 9 above the lower warehouse opening 7; The suspended high-pressure water flushing and dredging spraying device is arranged on the maintenance I-beam 6 of the upper warehouse belt conveyor head chamber 10 above the upper warehouse opening 5; The feeding end of the gravity-sensing coal feeder device is arranged directly below the lower bin opening 7; The air cannon device 1 is arranged on the left and right sides of the coal bunker maintenance platform 3 and on the front and rear sides of the hyperbolic closing funnel structure 9 above the lower bunker opening 7; The upper compartment opening 5 is set at the air outlet of the pre-buried ventilation pipeline to automatically start the mechanical ventilation device; A circulating cleaning device for large coal gangue is arranged at the upper storage opening 5.

[0026] The peep camera device (not shown) includes a peep rod, one end of which is equipped with a camera. The peep rod is used to pass through the reserved observation hole 4 and extend into the coal bunker 2 to peek at the internal blockage situation. If the reserved observation hole 4 is blocked, the peep rod and the camera are used to observe the internal situation of the coal bunker 2 through the upper bunker opening 5 of the coal bunker 2.

[0027] The central suspension vibrating rod device includes a vertically arranged steel pipe 11, the upper end of which is connected to the maintenance I-beam 6 through a flexible sling 12, and the lower end of the steel pipe 11 is connected to the upper end of the coal distributor 8 through a flexible rope 13. A number of vibrating rods are evenly arranged in the middle and lower parts of the steel pipe 11 along the height direction, and a number of linkage rods 14 are evenly arranged on the outer circle of the steel pipe 11. The power cord of the vibrating rod penetrates the steel pipe 11 through the upper port of the steel pipe 11. When the coal bunker 2 is blocked, the vibrating rod is started. The working principle of the vibrating rod is to use a high-speed rotating motor and a reducer to reduce the rotation speed of the motor, and convert the rotation force into a reciprocating force and a swinging force to generate strong vibration. The vibrating rod transmits the vibration force to the steel pipe 11 through the rubber vibrating head, and then a number of linkage rods 14 arranged on the steel pipe 11 disturb the blocked coal body, so that the blocked part can be unblocked.

[0028] The embedded hydraulic crocodile plate device includes a movable crocodile plate 15 and a reciprocating telescopic hydraulic cylinder 16. A mounting hole is provided on the lower side wall of the hyperbolic closing funnel structure 9. The movable crocodile plate 15 is assembled in the mounting hole and closes the mounting hole. The upper side of the movable crocodile plate 15 is connected to the upper side of the mounting hole through a hinge 17. The lower outer side of the movable crocodile plate 15 is hinged with the telescopic rod of the reciprocating telescopic hydraulic cylinder 16. The lower part of the hyperbolic closing funnel structure 9 at the lower part of the coal bunker 2 is prone to cause the coal bunker 2 to be blocked. This position is often the arch angle position where the blocking body forms an arch. When building the coal bunker 2, the movable crocodile plate 15 is embedded and arranged at this position. The outer side of the movable crocodile plate 15 is connected to the reciprocating telescopic hydraulic cylinder 16. When blocked here, the reciprocating telescopic hydraulic cylinder 16 is started. The movable crocodile plate 15 swings back and forth with the upper hinge 17 as the fulcrum, which produces mechanical disturbance to the blocking body and destroys the blocking body.

[0029] The suspended high-pressure water flushing and dredging spraying device includes a small winch 18 and a suspension sheave 19 installed on the maintenance I-beam 6. The suspension wire rope 20 wound on the small winch 18 passes around the suspension sheave 19. The movable end of the suspension wire rope 20 is connected to a protective cover 21. The protective cover 21 is a diamond cone structure or a spherical structure. The protective cover 21 is provided with a plurality of nozzles 22. The suspension wire rope 20 is connected side by side with a high-pressure water pipe 37. The lower end of the high-pressure water pipe 37 extends into the protective cover 21 and is connected to the water inlet of the plurality of nozzles 22. When the coal bunker 2 needs to be cleaned, the small winch 18 drives the suspension wire rope 20 to drag the protective cover 21 vertically up and down along the coal bunker 2. When not in use, it is suspended on the maintenance I-beam 6 of the upper bunker belt machine head chamber 10. The protective cover 21 is a diamond cone structure or a spherical structure as a whole. Four nozzles 22 are distributed in an annular manner in the upper half of the protective cover 21, and four nozzles 22 are distributed in an annular manner in the lower half. When a blockage occurs or too thick coal slime accumulates around it, the suspended high-pressure water flushing and dredging spray device can be connected to the suspended wire rope 20, and the traction force of the small winch 18 is used to pull the device from bottom to top to impact and hit the blocking body to loosen the blocked coal and gangue. At the same time, the high-pressure water supply system is activated to spray high-pressure water through the nozzle 22 to dredge the coal bunker 2. Under the safe premise that personnel do not enter the bunker body, the blocked coal body is flushed and softened with high-pressure water to destroy the stability of the blocking body. The water mist sprayed when the bunker is empty can clean the stubborn coal slime attachments adhered to the bunker wall, so that the bunker wall remains smooth, which is convenient for the loose coal to slide down smoothly under the action of gravity.

[0030] The gravity-sensing coal feeder device includes a weighing coal feeder 23 and a belt conveyor 24. The feed port of the weighing coal feeder 23 is connected to the lower bin port 7. The feed end of the belt conveyor 24 is located directly below the discharge port of the weighing coal feeder 23. The weighing coal feeder 23 is provided with a gravity sensor for monitoring the amount of coal in the lower bin port 7 of the coal bunker 2. The coal bunker 2 is not allowed to be emptied according to relevant specifications, but manual operation may cause the coal bunker 2 to be emptied due to the lack of a reliable coal level indicator. At the moment of complete emptying, the wind flow short-circuits, and the lower bin port 7 of the coal bunker 2 forms an upward wind flow disturbance airflow, causing the coal body and coal powder at the bottom of the bunker to be blown to the upper part, causing the gas adsorbed on the surface of the coal body to become free gas, and the gas is instantly released upward through the coal bunker 2, causing the gas at the upper bin port 5 to exceed the limit. To avoid such a time, the present invention arranges a gravity-sensing coal feeder device at the lower bin port 7 of the coal bunker 2. The gravity sensor monitors the amount of coal stored in the coal bunker 2 in real time. When the amount of coal monitored by the gravity sensor is small, a stop command is issued to the belt conveyor 24, thereby avoiding airflow short-circuit caused by the emptying of the coal bunker 2, and avoiding the gas in the bunker from blowing to the gas sensor 25 at the upper bunker opening 5 after the airflow short-circuit, causing the gas sensor 25 at the upper bunker opening 5 to issue a gas over-limit alarm.

[0031] In general, avoid using air cannon device 1 to avoid the gas exceeding the upper port 5 limit caused by air disturbance in the warehouse. If it is necessary to use the air cannon disturbance device, corresponding special measures are required to avoid the gas exceeding the upper port 5 limit accident.

[0032] The pre-buried ventilation pipeline automatically starts the mechanical ventilation device, which includes a ventilation pipe 26 and a pressure-in ventilator 27. The pressure-in ventilator 27 is installed on the maintenance platform of the coal bunker 2. The pressure-in ventilator 27 is linked to the gas sensor 25 installed on the upper bunker opening 5. The ventilation pipe 26 is installed in the bedrock groove outside the coal bunker 2. The ventilation pipe 26 is pre-buried in the groove of the bedrock. The lower end of the ventilation pipe 26 is connected to the air outlet of the pressure-in ventilator 27, and the upper end of the ventilation pipe 26 extends to the upper bunker belt machine head chamber 10 above the upper bunker opening 5.

[0033] During the construction of coal bunker 2, the ventilation pipe 26 pre-buried in the rock mass usually adopts the "natural ventilation" mode. When the gas at the upper bunker port 5 exceeds the limit, the control of the over-limit accident is insufficient. The present invention adds a push-in fan 27 in the lower maintenance channel of the pre-buried ventilation pipe 26, and improves the ventilation mode of the ventilation pipe 26 to the "natural ventilation + mechanical ventilation" mode. Relevant specifications require that: when the gas sensor 25 at the upper bunker port 5 monitors a volume concentration greater than 1.5%, a gas alarm will be generated. The system is designed to operate in conjunction with the threshold of the gas sensor 25 at the upper bunker port 5 and the mechanical ventilation fan, and a mechanical forced ventilation locking system is set. When the gas monitoring volume concentration of the upper bunker port 5 reaches 1.2%, mechanical ventilation is forced to start to strengthen the ventilation in the bunker, so as to avoid the gas concentration being greater than the threshold of the alarm value of the gas sensor 25 volume concentration of 1.5%. Under normal circumstances, natural ventilation using the pre-buried ventilation pipe 26 can meet the function of diluting the gas in the bunker. When the gas content of the raw coal is too high and the desorption gas amount is abnormal, the mechanical ventilation mode is automatically started for forced ventilation. Avoid the gas sensor 25 at the top of coal bunker 2 from exceeding the limit.

[0034] The device for cleaning large pieces of coal gangue in a cycle includes an anti-falling grate 28, a vibrating screen plate 29, a gravity sensor 30, a suspension belt conveyor 31, a first scraper conveyor 32, a second scraper conveyor 33, a crusher 34 and a chute device 35. The anti-falling grate 28 is laid on the upper warehouse opening 5. The vibrating screen plate 29 is tilted and arranged directly above the anti-falling grate 28 with a lower front and a higher rear. The rear end of the upper warehouse belt lane 36 is connected to the front end of the upper warehouse belt machine head chamber 10. The suspension belt conveyor 31, the first scraper conveyor 32, the second scraper conveyor 33, the crusher 34 and the chute device 35 are arranged in the upper warehouse belt lane 36. A plurality of hanging steel wire ropes 38 are arranged between the suspension belt conveyor 31 and the top plate of the upper warehouse belt lane 36. The lower front end of the vibrating screen plate 29 is connected to the feed end of the first scraper conveyor 32, the gravity sensor 30 is arranged at the feed end of the rear side of the first scraper conveyor 32, the first scraper conveyor 32 and the second scraper conveyor 33 are located below the suspended belt conveyor 31, and a bracket 39 is provided at the bottom of the first scraper conveyor 32 and the second scraper conveyor 33. The front end discharge end of the first scraper conveyor 32 is connected to the feed port of the crusher 34, and the discharge port of the crusher 34 is located above the rear end feed end of the second scraper conveyor 33. One side of the discharge end on the front side of the second scraper conveyor 33 is connected to the suspended belt conveyor 31 through a chute device 35, and a baffle 40 is provided at the front end of the second scraper conveyor 33.

[0035] The upper opening 5 of the coal bunker 2 is the coal inlet, and a flat grate is usually used to screen out large pieces of coal gangue to prevent large pieces of coal gangue from entering the coal bunker 2. The mine uses manual methods to clean up large pieces of coal gangue, which is labor-intensive and inefficient, and is prone to safety risks due to high-altitude operations. In order to reduce the labor intensity of manual labor and improve work efficiency and safety, the present invention designs a cyclic cleaning device for large pieces of coal gangue. The specific working process of the cyclic cleaning device for large pieces of coal gangue is as follows: A vibrating screen plate 29 is arranged on the grate with a low front and a high back. The screen hole of the vibrating screen plate 29 is 400×400 mm, and the size of the screen hole is larger than the size of the suspension equipment (protective cover 21, etc.). The inclination angle of the vibrating screen plate 29 is larger than the natural repose angle of large pieces of coal gangue, so that the large pieces of coal gangue can move under the screen plate under normal circumstances. The coal transported by the suspended belt conveyor 31 falls onto the vibrating screen plate 29 from the rear end, and the coal body and small pieces of coal gangue that pass through the vibrating screen plate 29 fall through the grate and fall into the coal bunker 2. The large pieces of coal gangue cannot pass through the vibrating screen plate 29 and then slide down along the vibrating screen plate 29. It falls to the rear feeding end of the first scraper conveyor 32, and the gravity sensor 30 monitors the weight of the large pieces of coal gangue. When the accumulated weight reaches the set weight, the first scraper conveyor 32 starts to convey the large pieces of coal gangue to the crusher 34. The crusher 34 crushes the large pieces of coal gangue and then conveys them forward by the second scraper conveyor 33. The crusher 34 conveys them to the suspension belt through the chute device 35. The suspension belt conveyor 31 then conveys the crushed small pieces of coal gangue together with the coal conveyed backwards to the vibrating screen plate 29. The cycle is repeated until the large pieces of coal gangue are finally crushed into small pieces and conveyed to the coal bunker 2.

[0036] The above embodiments illustrate the basic principles and features of the present invention, but the above only illustrates the preferred embodiments of the present invention and is not limited to the embodiments. Under the inspiration of this patent, a person skilled in the art can make many forms of deformation and improvement without departing from the scope of protection of the present invention and the claims, which are all within the protection scope of the present invention. Therefore, the patent and protection scope of the present invention shall be subject to the attached claims.

Claims

1. A system for clearing blockage in coal bunkers and preventing excessive gas at the upper bunker opening of coal mines, characterized in that: It includes a peep camera device, a centrally suspended vibrating rod device, a pre-buried hydraulic crocodile plate device, a suspended high-pressure water flushing and dredging spray device, a gravity-sensing coal feeder device, an air cannon device, a pre-buried ventilation pipeline automatic start mechanical ventilation device and a circulating cleaning device for large pieces of coal gangue; The coal bunker is provided with a reserved observation hole at the coal bunker inspection platform, and a hole cover is provided at the reserved observation hole. The peep camera device peeks and photographs the inside of the coal bunker through the reserved observation hole; The central suspension vibrating rod device is arranged along the vertical center line of the coal bunker, the upper end of the central suspension vibrating rod device is suspended and connected to the maintenance I-beam above the upper bunker opening, and the lower end of the central suspension vibrating rod device is connected to the upper end of the coal distributor arranged at the center of the lower bunker opening; The embedded hydraulic crocodile plate device is arranged on the left and right sides of the lower part of the hyperbolic closing funnel structure above the lower warehouse opening; The suspended high-pressure water flushing and dredging spray device is installed on the maintenance I-beam of the upper warehouse belt conveyor head chamber above the upper warehouse opening; The feeding end of the gravity-sensing coal feeder device is arranged just below the lower bin opening; The air cannon devices are installed on the left and right sides of the coal bunker maintenance platform and on the front and rear sides of the hyperbolic closing funnel structure above the lower bunker opening; The upper compartment opening is set at the air outlet of the pre-buried ventilation pipeline to automatically start the mechanical ventilation device; The circulating cleaning device for large coal gangue is installed at the upper storage opening.

2. A system for clearing blockage in coal bunkers and preventing excessive gas at the upper bunker opening of a coal mine according to claim 1, characterized in that: The peep camera device includes a peep rod, one end of which is equipped with a camera. The peep rod is used to pass through a reserved observation hole and extend into the coal bunker to peek at the internal blockage situation. If the reserved observation hole is blocked, the peep rod and the camera are used through the upper bunker opening to observe the internal situation of the coal bunker.

3. A system for clearing blockage in coal bunkers and preventing excessive gas at the upper bunker opening of a coal mine according to claim 1, characterized in that: The centrally suspended vibrating rod device comprises a vertically arranged steel pipe, the upper end of which is connected to the maintenance I-beam by a flexible sling, the lower end of which is connected to the upper end of the coal distributor by a flexible rope, a number of vibrating rods are evenly arranged in the middle and lower part of the steel pipe along the height direction, and a number of linkage rods are evenly arranged on the outer circle of the steel pipe.

4. A system for clearing blockage in coal bunkers and preventing excessive gas at the upper bunker opening of a coal mine according to claim 1, characterized in that: The embedded hydraulic crocodile plate device includes a movable crocodile plate and a reciprocating telescopic hydraulic cylinder. A mounting hole is opened on the lower side wall of the hyperbolic closing funnel structure. The movable crocodile plate is assembled in the mounting hole and closes the mounting hole. The upper side of the movable crocodile plate is connected to the upper side of the mounting hole through a hinge, and the outer side of the lower part of the movable crocodile plate is hinged to the telescopic rod of the reciprocating telescopic hydraulic cylinder.

5. A system for clearing blockage in coal bunkers and preventing excessive gas at the upper bunker opening of a coal mine according to claim 1, characterized in that: The suspended high-pressure water flushing and unblocking spray device includes a small winch and a suspension sheave installed on the maintenance I-beam. The suspension wire rope wound on the small winch passes around the suspension sheave. The movable end of the suspension wire rope is connected to a protective cover. The protective cover is a diamond cone structure or a spherical structure. A plurality of nozzles are provided on the protective cover. The suspension wire rope is connected in parallel with a high-pressure water pipe. The lower end of the high-pressure water pipe extends into the protective cover and is connected to the water inlets of a plurality of nozzles.

6. A system for clearing blockage in coal bunkers and preventing excessive gas at the upper bunker opening of a coal mine according to claim 1, characterized in that: The gravity-sensing coal feeder device includes a weighing coal feeder and a belt conveyor. The feed port of the weighing coal feeder is connected to the lower bin port, and the feed end of the belt conveyor is located directly below the discharge port of the weighing coal feeder. The weighing coal feeder is provided with a gravity sensor for monitoring the amount of coal in the lower bin port of the coal bin.

7. A system for clearing blockage in coal bunkers and preventing excessive gas at the upper bunker opening of a coal mine according to claim 1, characterized in that: The pre-buried ventilation pipeline automatically starts the mechanical ventilation device, which includes a ventilation pipe and a pressure-type ventilator. The pressure-type ventilator is installed on the coal bunker maintenance platform. The pressure-type ventilator is linked to the gas sensor installed on the upper bunker opening. The ventilation pipe is arranged in the bedrock groove outside the coal bunker. The ventilation pipe is pre-buried in the groove cut out of the bedrock. The lower end of the ventilation pipe is connected to the air outlet of the pressure-type ventilator, and the upper end of the ventilation pipe extends to the upper bunker belt machine head chamber above the upper bunker opening.

8. A system for clearing blockage in coal bunkers and preventing excessive gas at the upper bunker opening of a coal mine according to claim 1, characterized in that: The device for circulating and cleaning large pieces of coal gangue includes an anti-falling grate, a vibrating screen plate, a gravity sensor, a suspended belt conveyor, a first scraper conveyor, a second scraper conveyor, a crusher and a chute device. The anti-falling grate is laid at the upper warehouse opening, and the vibrating screen plate is tilted and arranged directly above the anti-falling grate with a low front and a high rear. The rear end of the upper warehouse belt lane is connected to the front end of the upper warehouse belt machine head chamber. The suspended belt conveyor, the first scraper conveyor, the second scraper conveyor, the crusher and the chute device are arranged in the upper warehouse belt lane. The suspended belt conveyor is connected to the upper warehouse belt conveyor. A number of hanging steel ropes are arranged between the top plates of the belt lanes. The lower end of the front side of the vibrating screen plate is connected with the feed end of the first scraper conveyor. The gravity sensor is arranged at the feed end of the rear side of the first scraper conveyor. The first scraper conveyor and the second scraper conveyor are located below the suspended belt conveyor. The front discharge end of the first scraper conveyor is connected with the feed port of the crusher. The discharge port of the crusher is located above the rear feed end of the second scraper conveyor. The front discharge end of the second scraper conveyor is connected with the suspended belt conveyor through a chute device.

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