Protective device for lower opening of coal slipping hole in underground coal mine

Abstract

The utility model discloses a protection device for a lower opening of a coal slipping hole in an underground coal mine, which relates to the technical field of safety production and comprises a baffle plate, a hoisting device and a traction rope for connecting the baffle plate and the hoisting device, the baffle plate is profiled with the side wall of the coal slipping hole and can move up and down along the coal slipping hole; the baffle plate can be taken out from the upper part and the lower part of the coal slipping hole; the hoisting device is fixed at the top of the coal slipping hole upper opening; the pulling rope is connected with the baffle and the lifting device and pulls the baffle to move up and down along the coal slipping hole. Dynamic closing and safety protection are achieved through the synergistic effect of the baffle, the lifting device and the traction rope; the device is simple in structure and easy to operate, reduces maintenance time, improves working efficiency, reduces maintenance cost, and is good in protection effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of safety production, especially relates to a coal mine underground coal chute lower opening protection device. BACKGROUND

[0002] The coal chute is a key link of coal transportation in the coal mine, and is usually directly constructed by using a raise-boring machine in cooperation with a large-diameter drill bit. The inner wall of the coal chute is not supported, and a locking device is installed at the lower opening after the construction is completed to control the coal drawing. With the increase of service life, the device at the lower opening is prone to damage. During the construction process of initially installing the locking device or replacing the locking device, the construction personnel need to stand at the lower opening of the coal chute to construct, and the construction personnel are often hit by the falling gangue on the inner wall of the coal chute, which affects the safety of the coal drawing.

[0003] The protective measures taken by the traditional construction are as follows: the inner wall of the coal chute is anchored and netted before the locking device is installed. The anchoring and netting involve the hoisting of a tank, and the process is complex, which prolongs the maintenance time and increases the maintenance cost, and the degree of danger is high. In addition, after the maintenance is completed, there is still a risk that small pieces of gangue will fall and injure people, and the protective effect is poor. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a coal mine underground coal chute lower opening protection device, which realizes dynamic closure and safety protection through the synergistic effect of the baffle, the hoisting device and the traction rope, has a simple structure, is easy to operate, reduces the maintenance time, improves the work efficiency, reduces the maintenance cost, and has a good protective effect.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a coal mine underground coal chute lower opening protection device, which comprises a baffle, a hoisting device and a traction rope connecting the baffle and the hoisting device. The baffle is shaped according to the side wall of the coal chute and can move up and down along the coal chute. The baffle can be taken out from above and below the coal chute. The hoisting device is fixed on the top of the upper opening of the coal chute. The traction rope connects the baffle and the hoisting device, and the traction rope moves the baffle up and down along the coal chute.

[0006] After the above-mentioned structure is adopted, the baffle is placed in a suitable position by the hoisting device, which plays a shielding role on the coal chute. When the coal and gangue in the coal chute fall, they will be supported on the baffle and will not fall to the bottom of the coal chute, so that the harm to the personnel below is avoided. The application of the baffle, the hoisting device and the traction rope has a simple structure and is easy to operate. The coal chute does not need to be additionally supported, the maintenance time is reduced, the work efficiency is improved, the maintenance cost is reduced, and the protective effect is good. After the maintenance is completed, the baffle can be directly taken out from the upper opening of the coal chute, which is convenient to operate and can be repeatedly used.

[0007] Preferably, the baffle is uniformly provided with multiple lifting rings above; multiple lifting devices are provided above the coal chute corresponding to the lifting rings, and one lifting device is connected to one lifting ring through an independent traction rope.

[0008] Preferably, the lifting ring comprises a center lifting ring fixed at the center of the baffle and multiple peripheral lifting rings uniformly arranged around the center lifting ring; the lifting device comprises a center lifting device fixed on the top plate above the coal chute and corresponding to the center lifting ring and a peripheral lifting device fixed on the peripheral bottom plate of the coal chute and corresponding to the peripheral lifting ring. Through the arrangement of the structure, the stress is reasonably distributed, and the baffle can be conveniently lifted and inclined, and can be used in different working conditions.

[0009] Preferably, the lifting device is a pneumatic hoist.

[0010] Preferably, the center lifting device is fixed on the top plate through a top anchor rod; and the peripheral lifting device is fixed on the bottom plate through a ground anchor. The anchor rod is fixed in a way that is firm and convenient to operate.

[0011] Preferably, the top anchor rod is perpendicular to the top plate; and the ground anchor is inclined to the outside of the coal chute by 10-15°. Through the arrangement of the structure, the pullout resistance of the anchor rod is improved.

[0012] Preferably, the traction rope is marked with length.

[0013] Preferably, a protective cover is arranged at the upper opening of the coal chute, and the protective cover is provided with a through hole for the traction rope to pass through. Through the arrangement of the structure, the upper opening of the coal chute or personnel and materials falling into the coal chute can be avoided.

[0014] Preferably, the protective cover comprises a frame arranged around the upper opening of the coal chute; the frame has a square structure; opposite sides of the frame are uniformly provided with insertion holes, and support rods are detachably inserted into the insertion holes; the adjacent support rods surround a through hole; one end of all the support rods outside is fixed on a push plate, and all the support rods can be inserted into the corresponding through hole by pulling the push plate.

[0015] Preferably, a guide wheel is fixed on the side of the frame above corresponding to the peripheral lifting device, and the traction rope extends into the coal chute after passing through the guide wheel.

[0016] After the above technical scheme is adopted, the beneficial effects of the present application are as follows:

[0017] This utility model provides a protective device for the lower opening of coal chutes in underground coal mines. It solves the technical problems of high cost and long support cycle in the existing technology for the protection of the lower opening of coal chutes in underground coal mines. This utility model achieves dynamic closure and safety protection through the coordinated action of baffles, lifting devices and traction ropes. It has a simple structure, is easy to operate, reduces maintenance time, improves work efficiency, reduces maintenance costs, and has a good protective effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pre-construction preparation stage of a protective device for the lower opening of a coal chute in an underground coal mine, according to this utility model.

[0019] Figure 2 This is a schematic diagram of the construction stage of a protective device for the lower opening of a coal chute in an underground coal mine, according to this utility model.

[0020] Figure 3 This is a schematic diagram of the baffle removal stage after construction of a protective device for the lower opening of a coal chute in a coal mine according to this utility model.

[0021] Figure 4 This is a schematic diagram of the protective cover.

[0022] Figure 5 yes Figure 4 A schematic diagram of the structure of the middle support rod.

[0023] In the diagram, 1 is the baffle, 11 is the lifting ring, 2 is the lifting device, 21 is the central lifting device, 22 is the peripheral lifting device, 23 is the top anchor bolt, 24 is the ground anchor, 3 is the traction rope, 4 is the coal chute, 5 is the protective cover, 51 is the frame, 52 is the support rod, 521 is the push plate, and 53 is the guide wheel. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] The orientations mentioned in this specification refer to the orientation of the protective device for the lower opening of a coal chute in a coal mine during normal operation. They do not limit the orientation during storage and transportation, and only represent relative positional relationships, not absolute positional relationships.

[0026] like Figures 1-3 As shown in the figure, a protective device for the lower opening of a coal chute in a coal mine includes a baffle 1, a lifting device 2, and a traction rope 3 connecting the baffle 1 and the lifting device 2.

[0027] The baffle 1 conforms to the sidewall of the coal chute 4 and can move up and down along the coal chute. The baffle 1 can be removed from the upper and lower openings of the coal chute. In this embodiment, the baffle 1 is made of a 4mm thick circular steel plate with a diameter slightly smaller than the coal chute (leaving a gap of 100-200mm). In practical applications, the thickness of the plate needs to be adjusted according to the material of the baffle 1 in order to achieve its stable load-bearing capacity.

[0028] The lifting device 2 is fixed to the top of the coal chute 4; the traction rope 3 connects the baffle 1 to the lifting device 2, and the length of the traction rope 3 is slightly greater than the depth of the coal chute (leaving 2-3m for future reference). Length markings are made on the traction rope 3, specifically every 5 meters, to facilitate monitoring of the lifting distance. The traction rope 3 pulls the baffle 1 up and down along the coal chute 4.

[0029] Before installing or replacing the locking device at the bottom of coal chute 4, the baffle 1 is placed in a suitable position using the lifting device 2, according to actual needs. This baffle 1 shields the coal chute 4, preventing coal and gangue from falling into the bottom and thus avoiding injury to workers below. The use of baffle 1, lifting device 2, and traction rope 3 results in a simple structure that is easy to operate. It eliminates the need for additional support for the coal chute 4, reducing maintenance time, improving work efficiency, and lowering maintenance costs, while providing good protection. After maintenance is completed, baffle 1 can be directly removed from the top of the coal chute 4.

[0030] Furthermore, to increase the stability of the baffle 1 and prevent falling coal and gangue from tilting the baffle 1 and causing it to fall from the side walls of the baffle 1 and the coal chute 4, multiple lifting rings 11 are evenly arranged above the baffle 1. Multiple lifting devices 2 are installed above the coal chute corresponding to the lifting rings 11, with each lifting device 2 connected to a lifting ring 11 via an independent traction rope 3. This multi-point distribution achieves redundancy, ensuring that a single point of failure does not affect overall stability.

[0031] Preferably, the lifting ring 11 includes a central lifting ring fixed to the center of the baffle 1 and a plurality of peripheral lifting rings evenly arranged around the central lifting ring; in this embodiment, four peripheral lifting rings are provided. The lifting device 2 includes a central lifting device 21 fixed to the top plate above the coal chute and corresponding to the central lifting ring, and a peripheral lifting device 22 fixed to the bottom plate around the coal chute 4 and corresponding to the peripheral lifting rings.

[0032] The lifting device 2 can be a winch or a pneumatic hoist. In this embodiment, a pneumatic hoist is preferred. A suitable compressed air source and control device must be provided at the site. Since pneumatic hoists are existing technology, their specific structure is symmetrical and will not be described in detail in this embodiment. The pneumatic hoist has explosion-proof safety features. In coal mines, flammable and explosive gases such as methane and coal dust exist. The pneumatic hoist uses compressed air as its power source, producing no electrical sparks, thus meeting the mandatory requirements for explosion-proof equipment in the "Coal Mine Safety Regulations." Furthermore, the pneumatic hoist can achieve stepless speed regulation by adjusting the air valve, facilitating millimeter-level lifting, leveling, or tilting of the baffle 1. Additionally, the pneumatic hoist is small in size and lightweight, and can be directly fixed to anchor bolts or ground anchors, making it suitable for scenarios where the space at the top of the coal chute 4 is limited.

[0033] In this embodiment, to facilitate the installation of the lifting device 2, a φ22×2200mm top anchor rod 23 is installed on the top plate directly above the center of the coal chute 4, with approximately 100mm of the top anchor rod protruding. Four φ22×2200mm ground anchors 24 are evenly arranged around the coal chute on the bottom plate above the coal chute 4. The top anchor rod 23 is installed perpendicular to the top plate; the ground anchors 24 are inclined at 10° to 15° outwards from the coal chute to increase their pull-out resistance. The central lifting device 21 is fixedly installed on the top anchor rod 23; the peripheral lifting devices 22 are fixedly installed on the ground anchors 24. A traction rope 3 is connected to one central lifting device 21 and one of the four peripheral lifting devices 22. The traction rope 3 is a 5-point steel wire rope, and its length is 2 to 3 meters longer than the depth of the coal chute.

[0034] As for how to fix the lifting device 2 to the top anchor rod 23, it can be done by installing the anchor rod end connector. For example, when tightening the anchor rod nut, first insert a flat washer into the exposed threaded section of the anchor rod, and then tighten the M22 nut to the root of the anchor rod, ensuring that the washer is tightly against the top / bottom plate. Use a double nut back tightening or a nut + spring washer combination to prevent vibration from loosening. Pass a D-type shackle (e.g., 5-ton) through the exposed end of the anchor rod, tighten the shackle pin, and lock the safety device. Hook the upper hook of the pneumatic hoist into the shackle and close the hook safety tongue. You can also add a wire rope binding safety by wrapping the hoist shell with a φ12mm wire rope to the adjacent support anchor rod as a fall protection redundancy. Of course, other installation methods can also be used, and this embodiment does not limit this.

[0035] Five steel wire ropes are lowered to the bottom of coal chute 4. The baffle plate 1 is transported from inside the roadway to the bottom of coal chute 4. The steel wire ropes hanging from the top of coal chute 4 are threaded into the corresponding lifting rings 11 of baffle plate 1. Each steel wire rope is then secured with at least three steel wire rope clips to ensure a firm connection. The central lifting device 21, which is fixed to the roof above coal chute 4, is activated to apply force to the steel wire rope at the center of baffle plate 1. Simultaneously, the other four peripheral lifting devices 22 are activated to ensure even force on baffle plate 1, which is then slowly suspended at the bottom of coal chute 4. The position of baffle plate 1 is adjusted according to the design position of the locking device at the bottom of coal chute 4, and then leveled. At this point, the bottom of coal chute 4 is completely protected by baffle plate 1, and workers at the bottom will not be threatened by falling rock from the inner wall of coal chute 4, ensuring construction safety. During the lower opening construction, if there is a large amount of gangue piled up above the baffle 1, the construction personnel at the lower opening can be temporarily withdrawn. By activating the different pneumatic hoists at the upper opening of the coal chute 4, the baffle 1 inside the coal chute 4 can be tilted to the side, causing the gangue above the baffle 1 to fall to the lower opening. Afterwards, the baffle 1 can be leveled, and construction can continue. Once the locking device at the lower opening of the coal chute 4 is installed, the lower opening of the coal chute 4 will be blocked by the locking device, and the baffle 1 cannot be removed from the lower opening. The five lifting devices 2 at the upper opening of the coal chute 4 can then be pulled upwards to move the baffle 1 inside the coal chute 4 upwards. Because the lifting device 2 used in this embodiment is a pneumatic hoist, it has a travel limit. When the pneumatic hoist reaches its travel limit, the pneumatic hoist on the top plate of the coal chute 4 is released, the lifting hook is lowered, and it is reconnected to the corresponding wire rope. At this time, the baffle 1 is suspended by the four wire ropes around it. After the hook of the pneumatic hoist at the top of the coal chute 4 is firmly connected to the wire rope, the four pneumatic hoists (peripheral lifting devices 22) on the bottom plate of the top of the coal chute 4 are sequentially released, lowered, and reconnected to the corresponding wire rope. At this time, the baffle 1 inside the coal chute 4 is suspended by other wire ropes. After the hooks of the four pneumatic hoists on the bottom plate of the top of the coal chute 4 are firmly connected to the wire rope, they are pulled up simultaneously, causing the baffle 1 inside the coal chute 4 to move upward. This cycle is repeated until the baffle 1 inside the coal chute 4 is pulled to the top of the coal chute 4, and then removed from the top.

[0036] In another embodiment, to effectively protect the upper opening of the coal chute 4, a protective cover 5 is installed at the upper opening of the coal chute 4. The protective cover 5 has a through hole for the traction rope 3 to pass through. The protective cover 5 can be temporarily closed at the upper opening using a closely spaced railway or I-beams, leaving only a gap for the traction rope 3, to prevent the upper opening of the coal chute 4 or personnel and materials from falling into the coal chute 4, and also to facilitate the operation of the pneumatic hoist on the top plate of the upper opening of the coal chute 4. When it is necessary to remove the baffle 1 from the upper opening, the protective cover 5 is removed, and then the baffle 1 is withdrawn from the upper opening of the coal chute 4, thus completing the entire protection process.

[0037] like Figure 4 and Figure 5As shown, the protective cover 5 is provided below: The protective cover 5 includes a frame 51 disposed around the upper perimeter of the coal chute 4; the frame 51 has a square structure; the coal chute 4 is located in the middle of the frame 51. Insertion holes are evenly arranged on opposite sides of the frame 51, and support rods 52 are detachably inserted into the insertion holes. When all the support rods 52 are inserted into the frame 51, the support rods 52 can cover the coal chute 4, thereby shielding the coal chute 4. Adjacent support rods 52 form a through hole, thus not obstructing the passage of the traction rope 3. When it is necessary to open the coal chute 4, the support rods 52 can be removed from the frame 51.

[0038] To facilitate the disassembly of the support rods 52, one end of each support rod 52 is fixed to the push plate 521. Pulling the push plate 521 allows all support rods 52 to be simultaneously inserted into their corresponding through holes. To prevent the push plate 521 from protruding from the frame 51 and causing misoperation due to collision or other reasons, a groove is provided on one side of the push plate 521 on the frame 51. When a support rod 52 is inserted into its corresponding hole, the push plate 521 engages with the groove. For easy pushing and pulling, a pull ring is also provided on the push plate 521. Pulling the pull ring allows the push plate 521 to be easily pulled out of the groove.

[0039] Furthermore, in order to guide the traction rope 3 and prevent it from rubbing against the edge of the frame 51, a guide wheel 53 is fixed on the upper side of the frame 51 corresponding to the peripheral lifting device. The traction rope 3 of the peripheral lifting device extends into the coal chute 4 after passing through the guide wheel 53. The guide wheel 53 guides and supports the traction rope 3, reducing friction of the traction rope 3.

[0040] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A coal mine underground coal chute mouth protection device, characterized in that: The baffle, the lifting device and the traction rope connecting the baffle and the lifting device; The baffle is shaped according to the sidewall of the coal chute and can move up and down along the coal chute, and the baffle can be taken out from above and below the coal chute; The lifting device is fixed on the top of the upper opening of the coal chute; The traction rope connects the baffle and the lifting device, and the traction rope pulls the baffle to move up and down along the coal chute; the baffle is uniformly provided with a plurality of lifting rings above; a plurality of lifting devices are provided above the coal chute corresponding to the lifting rings, and one lifting device is connected to one lifting ring through an independent traction rope.

2. The coal mine underground coal chute mouth protection device according to claim 1, characterized in that: The lifting ring includes a center lifting ring fixed in the center of the baffle and a plurality of peripheral lifting rings uniformly arranged around the center lifting ring; The lifting device includes a center lifting device fixed on the top plate above the coal chute and corresponding to the center lifting ring, and a peripheral lifting device fixed on the bottom plate around the coal chute and corresponding to the peripheral lifting ring.

3. The coal mine underground coal chute mouth protection device according to claim 1, characterized in that: The lifting device is a pneumatic hoist.

4. The coal mine underground coal chute mouth protection device according to claim 2, characterized in that: The center lifting device is fixed on the top plate through a top anchor, and the peripheral lifting device is fixed on the bottom plate through a ground anchor.

5. The coal mine underground coal chute mouth protection device according to claim 4, characterized in that: The top anchor is installed perpendicular to the top plate, and the ground anchor is inclined to the outside of the coal chute by 10°-15°.

6. The coal mine underground coal chute mouth protection device according to claim 2, characterized in that: The traction rope is marked with length.

7. The coal mine underground coal chute mouth protection device according to claim 2, characterized in that: The upper opening of the coal chute is provided with a protective cover, and the protective cover is provided with a through hole for the traction rope to pass through.

8. The coal mine underground coal chute mouth protection device according to claim 7, characterized in that: The protective cover includes a frame arranged around the upper opening of the coal chute; the frame is a square structure; Opposite sides of the frame are uniformly provided with insertion holes, and support rods are detachably inserted into the insertion holes; the through hole is surrounded by adjacent support rods; one end of all the support rods outside is fixed on a push plate, and pulling the push plate can simultaneously insert all the support rods into the corresponding through hole.

9. The coal mine underground coal chute mouth protection device according to claim 8, characterized in that: The frame is provided with a guide wheel above the side corresponding to the peripheral lifting device, and the traction rope extends into the coal chute through the guide wheel.

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