A device for inducing the collapse of hard roof in two roadways of a coal mine

Abstract

This invention discloses a device for inducing the collapse of hard roof in two roadways of a coal mine. It includes a push-pull jack horizontally mounted on the end hydraulic support base near the roadway side, a fixed base connected to the push-pull jack, and a crushing mechanism mounted on the fixed base. The crushing mechanism includes a guide beam mounted on the fixed base, a top frame mounted on the guide beam, and at least one punch mounted on the top frame. Support jacks are respectively provided on the front and rear sides of the guide beam, and the telescopic rods of the support jacks are hinged to the bottom of the top frame. This invention can perform targeted and quantitative crushing and grooving of hard roof in roadways. The device can be used alone or as a supplement to blasting or hydraulic fracturing methods. It can be used to break rock or remove anchor bolts and cables.

Description

Technical Field

[0001] This invention relates to the field of coal mine construction technology, specifically to a device for inducing the collapse of hard roof in two roadways of a coal mine. Background Technology

[0002] Currently, the main method for dealing with the roof of the goaf in coal mining faces in my country is the direct caving method. When the roof is relatively hard, the pressure step distance of the longwall working face is large and the period of roof suspension is long, which can reach about 60m. When it collapses suddenly, it will pose a serious threat to the mining equipment and personnel.

[0003] Hard roof coalfields account for more than one-third of China's coal mining areas. Under hard roofs, the initial and periodic pressure steps are large, causing the working face supports to be crushed and the adjacent roadways to deform and break, severely impacting safe and efficient coal mine production. To address the hard roof problem, domestic and international scholars have proposed drilling holes into the hard roof within the roadways on both sides, using blasting or hydraulic fracturing methods to control mine pressure. The blasting method involves drilling deep holes into the roof at a certain distance ahead of the working face, in the roadways above and below the working face, and using explosives to pre-fracture the hard, intact rock strata, thus shortening the pressure or fracture step. The hydraulic fracturing method involves pre-injecting high-pressure water into the hard rock strata from the coal face ahead of the working face to fracturize and soften the roof. This involves drilling holes into the hard rock strata ahead of the working face and injecting high-pressure water, using high-pressure water fracturing and prolonged soaking to soften the hard rock strata, thereby shortening the pressure or fracture step.

[0004] However, the above methods are all macro-control methods, with poor prediction and control accuracy, often resulting in over- or under-crushing, and also posing certain safety risks. Over-crushing can lead to roof collapse and coal wall spalling, causing difficulties in managing the mine roof and coal wall; under-crushing has little effect. Summary of the Invention

[0005] In view of this, the purpose of this invention is to address the shortcomings of the prior art by providing a device for inducing the collapse of hard roofs in two roadways of coal mines, which can control the roof at fixed points and quantitatively, induces the working face to collapse by breaking the roof and removing anchor bolts, and controls the pressure step distance to shorten the suspended roof.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A device for inducing the collapse of hard roof in two roadways of a coal mine includes a push-pull jack horizontally mounted on the end hydraulic support base near the roadway side, a fixed base connected to the push-pull jack, and a crushing mechanism mounted on the fixed base. The crushing mechanism includes a guide beam mounted on the fixed base, a top frame mounted on the guide beam, and at least one punch mounted on the top frame. Support jacks are respectively provided on the front and rear sides of the guide beam, and the telescopic rods of the support jacks are hinged to the bottom of the top frame.

[0008] Regarding the above technical solution, the entire device moves along with the end hydraulic support base under the action of the push-pull jack. The guide beam serves as a guide and slide, increasing the stability of the punch during operation. It also bears the lateral force during jacking, preventing damage to the jacking jack and improving the reliability of the device. The punch is used to break the roof plate, and the length of the jacking frame is adapted to the forward step distance of the push-pull jack and the end support.

[0009] Preferably, auxiliary support mechanisms are provided on both sides of the guide beam. These mechanisms are activated during operation to ensure the stability of the device and retracted when moving forward.

[0010] Preferably, the auxiliary support mechanism includes a support baffle rotatably connected to the base plate of the fixed seat and a support cylinder hinged to the support baffle. The bottom of the support cylinder is hinged to a connecting plate disposed on the side plate of the fixed seat. When the support cylinder extends, it extends the support baffle along with it, which can increase the stability of the device.

[0011] Preferably, a limiting plate is horizontally provided on the side plate of the fixed base. This plate is used to limit the movement of the bottom support baffle.

[0012] Preferably, the fixing base has a box-shaped structure with its front and rear ends raised in a boat shape. The structure is lightweight and has good stability.

[0013] Preferably, the guide beam includes a support column, a guide column slidably connected to the inside of the support column, and a sleeve slidably connected to the outside of the support column. The tops of the sleeve and the guide column are both fixedly connected to the top frame. It can extend and retract together with the supporting jack, which can be used to improve the stability during punch operation.

[0014] The beneficial effects of this invention are:

[0015] This invention enables targeted and quantitative crushing and slotting of hard roofs in roadways. The device can be used alone or as a supplement to blasting or hydraulic fracturing methods. It can be used to break rock or remove anchor bolts and cables. It has the advantages of simple structure, stability and reliability, convenient operation, high work efficiency and good safety. It is beneficial to induce the collapse of the working face, control the pressure step distance, and promote safe, high-yield and efficient production in coal mines. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a side view of the present invention.

[0018] In the diagram: 1. Push-pull jack, 2. Fixed base, 3. Support jack, 4. Guide beam, 5. Top frame, 6. Punch, 7. Bottom support cylinder, 8. Bottom support baffle, 9. Limiting plate, 10. Support column, 11. Guide column, 12. Sleeve. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1-2 As shown, a device for inducing the collapse of hard roof in two roadways of a coal mine includes a push-pull jack 1 horizontally mounted on the end hydraulic support base near the roadway side, a fixed base 2 connected to the push-pull jack 1, and a crushing mechanism mounted on the fixed base 2. The fixed base 2 has a box-shaped structure, with its front and rear ends raised in a boat shape.

[0021] The crushing mechanism includes a guide beam 4 mounted on a fixed base 2, a top frame 5 mounted on the guide beam 4, and five punches 6 mounted on the top frame 5. The guide beam 4 includes a support column 10, a guide column 11 slidably connected to the inside of the support column 10, and a sleeve 12 slidably connected to the outside of the support column 10. The top of the sleeve 12 is fixedly connected to the top frame 5, and the connection between them can be a slider or a slide rail type. Support jacks 3 are respectively provided on the front and rear sides of the guide beam 4, and the telescopic rods of the support jacks 3 are hinged to the bottom of the top frame 5.

[0022] Auxiliary support mechanisms are provided on both sides of the guide beam 4. The auxiliary support mechanisms include a support baffle 8 rotatably connected to the base plate of the fixed seat 2 and a support cylinder 7 hinged to the support baffle 8. The bottom of the support cylinder 7 is hinged to a connecting plate provided on the side plate of the fixed seat 2. A limiting plate 9 is horizontally provided on the side plate of the fixed seat 2.

[0023] The working principle of this invention is as follows: During the advancement of the fully mechanized mining face, the fixed seat 2 can move forward with the end hydraulic support base. When in use, according to the need for roof breaking, the punch 6 can be adjusted up and down by controlling the extension and retraction of the roof support jack 3. The stability of the punch 6 can be improved by the auxiliary bottom support mechanism, thereby increasing the reliability of roof breaking and grooving or anchor bolt breaking operations.

[0024] This device enables targeted and quantitative crushing and slotting of the hard roof of the roadway, which is beneficial for inducing face collapse and controlling the crushing step distance, thereby reducing roof overhang and avoiding damage to equipment and personnel in the event of a sudden collapse of a long roof overhang. It has advantages such as simple structure, stability and reliability, convenient operation, large roof-breaking force, and good safety, which are conducive to inducing face collapse, controlling the crushing step distance, and promoting safe, high-yield, and efficient production in coal mines.

[0025] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A device for inducing the collapse of hard roof in two roadways of a coal mine, characterized in that, The device includes a push-pull jack horizontally mounted on the base of the end hydraulic support near the roadway, a fixed seat connected to the push-pull jack, and a crushing mechanism mounted on the fixed seat. The crushing mechanism includes a guide beam mounted on the fixed seat, a top frame mounted on the guide beam, and at least one punch mounted on the top frame. Support jacks are provided on the front and rear sides of the guide beam, and the telescopic rods of the support jacks are hinged to the bottom of the top frame. The guide beam includes a support column, a guide column slidably connected to the inside of the support column, and a sleeve slidably connected to the outside of the support column. The top of the sleeve is fixedly connected to the top frame.

2. The device for inducing hard roof collapse in two roadways of a coal mine according to claim 1, characterized in that, Auxiliary support mechanisms are provided on both sides of the guide beam.

3. The device for inducing hard roof collapse in two roadways of a coal mine according to claim 2, characterized in that, The auxiliary support mechanism includes a support baffle plate rotatably connected to the base plate of the fixed seat and a support cylinder hinged to the support baffle plate. The bottom of the support cylinder is hinged to a connecting plate provided on the side plate of the fixed seat.

4. The device for inducing the collapse of hard roof in two roadways of a coal mine according to claim 3, characterized in that, A limiting plate is horizontally provided on the side plate of the fixed base.

5. The device for inducing the collapse of hard roof in two roadways of a coal mine according to claim 1, characterized in that, The mounting base has a box-shaped structure, and its front and rear ends are raised in a boat shape.

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