A roof cracking device for a coal mining face

Abstract

The utility model provides a kind of coal face roof fracturing device, including inner support fixed mechanism, the inner support fixed mechanism is connected with support pipe in inside thread, one end of the support pipe is rotatably provided with connecting seat, and the connecting seat is detachably fixed with the fracturing device main body on the end away from the support pipe;In the utility model, the connecting seat inside one end of fracturing device main body and support pipe is connected, and the fracturing device main body and inner support fixed mechanism are inserted into the borehole inside roof, and the inner side of borehole is fixed by adjusting inner support fixed mechanism, to provide stable support for fracturing device main body, not occupy the space below roof, and not affect the range of activity of operating personnel.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine equipment technology, specifically relating to a roof cracking device for coal mining faces. Background Technology

[0002] Currently, carbon dioxide fracturing devices are commonly used in coal mines to achieve the purpose of fracturing. Carbon dioxide fracturing devices utilize the expansion of liquid carbon dioxide when heated and vaporized to rapidly release high-pressure gas to break rocks or coal. This solves the shortcomings of previous methods of blasting and pre-fracturing, such as high destructiveness, high risk, and ore body crushing, and provides a reliable guarantee for safe mining and pre-fracturing.

[0003] When a carbon dioxide fracturing device caves top coal, it is usually necessary to install a top rod for support. For example, in the prior art, Chinese utility model patent document with authorization announcement number CN212985216U discloses an adjustable top rod for caving top coal with a carbon dioxide fracturing device. One end of the top rod is equipped with the carbon dioxide fracturing device, and the other end is in contact with the ground to support the carbon dioxide fracturing device. This support method requires occupying the space under the roof and compressing the range of movement of the workers.

[0004] Therefore, it is necessary to design a roof fracturing device for coal mining faces that does not occupy the space below the roof and does not affect the range of movement of workers to solve the current technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a roof fracturing device for coal mining faces that does not occupy the space below the roof and does not affect the range of movement of workers.

[0006] The technical solution of this utility model is as follows: a roof fracturing device for a coal mining face, comprising an internal support fixing mechanism, wherein a support pipe is internally threadedly connected to the internal support fixing mechanism, a connecting seat is rotatably provided at one end of the support pipe, and a fracturing device body is detachably fixedly provided at the end of the connecting seat opposite to the support pipe; the internal support fixing mechanism has a support cylinder threadedly fitted on the outside of the support pipe, a rotating cylinder threadedly fitted on the outside of the support cylinder, a support ring rotatably connected to the outside of the rotating cylinder near the connecting seat, and diagonal bracing rods arranged in a circular array on the outside of the support cylinder near the connecting seat, one end of the diagonal bracing rods being hinged to the support cylinder, a connecting rod being hinged to the middle of the diagonal bracing rods, and the end of the connecting rod opposite to the diagonal bracing rods being hinged to the outside of the support ring.

[0007] Furthermore, an inner support plate is hinged to one end of the diagonal brace away from the support cylinder, and the inner support plate is an arc-shaped plate.

[0008] Furthermore, the inner support plate is uniformly provided with reverse teeth on the side opposite to the diagonal brace, and the reverse teeth are integral with the inner support plate.

[0009] Furthermore, an annular groove is formed on the outer side of the rotating cylinder near the support ring, and a retaining ring is rotatably disposed inside the annular groove, with one side of the retaining ring fixedly connected to one side of the support ring.

[0010] Furthermore, a first handle is symmetrically provided on one end of the support tube opposite to the connecting seat.

[0011] Furthermore, a second handle is symmetrically provided on one end of the support cylinder opposite to the connecting seat.

[0012] Furthermore, a third handle is symmetrically provided on the end of the rotating cylinder opposite to the connecting seat.

[0013] The beneficial effects of this utility model are:

[0014] (1) In this utility model, one end of the fracturing device body is connected to the connecting seat of one end of the support tube. The fracturing device body and the inner support fixing mechanism are inserted into the drill hole of the top plate. The inner support fixing mechanism is adjusted to abut against the inner side of the drill hole to provide stable support for the fracturing device body. It does not occupy the space below the top plate and does not affect the range of movement of the operators.

[0015] (2) In the internal support fixing mechanism, the rotating cylinder rotates relative to the support cylinder. The threaded structure between the support cylinder and the rotating cylinder is matched, which drives the rotating cylinder to move along its axial direction towards the connecting seat on the outside of the support cylinder. The rotating cylinder drives the support ring to move synchronously. The support ring drives one end of the connecting rod to move, pushing the diagonal brace to open outward and abut against the inside of the drill hole.

[0016] (3) After the internal support fixing mechanism is fixed to the borehole, the support tube rotates relative to the support tube. The threaded structure between the support tube and the support tube cooperates to drive the support tube to move the fracturing device body at one end of the borehole along its axial direction, thereby realizing the position adjustment of the fracturing device body. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the roof cracking device in the coal mining face of this utility model.

[0018] Figure 2 This is one of the partial structural schematic diagrams of the roof cracking device in the coal mining face of this utility model.

[0019] Figure 3 This is the second partial structural schematic diagram of the roof cracking device in the coal mining face of this utility model.

[0020] Figure 4 for Figure 3 Cross-sectional view at point AA.

[0021] Figure 5 for Figure 4 A magnified view of a section at point B in the middle. Detailed Implementation

[0022] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are not intended to limit the present invention or its application or use in any way. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0023] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] like Figures 1 to 5As shown, a roof fracturing device for a coal mining face is disclosed, including an internal support fixing mechanism 4. A support pipe 2 is threadedly connected to the internal support fixing mechanism 4. A connecting seat 3 is rotatably mounted on one end of the support pipe 2. A fracturing device body 1 is detachably fixed to the end of the connecting seat 3 facing away from the support pipe 2. The internal support fixing mechanism 4 has a support cylinder 41 threadedly fitted onto the outside of the support pipe 2. A rotating cylinder 42 is threadedly fitted onto the outside of the support cylinder 41. A support ring 43 is rotatably connected to the outside of the rotating cylinder 42 near the connecting seat 3. Diagonal braces 44 are arranged in a circular array on the outside of the support cylinder 41 near the connecting seat 3. One end of the diagonal braces 44 is hinged to the support cylinder 41, and a connecting rod 45 is hinged to the middle of the diagonal braces 44. The end of the connecting rod 45 facing away from the diagonal braces 44 is hinged to the outside of the support ring 43. In this embodiment, one end of the fracturing device body 1 is internally connected to the connecting seat 3 at one end of the support pipe 2, thus connecting the fracturing device body 1 and the internal support fixing mechanism 4. The fixing mechanism 4 is inserted into the borehole in the top plate. The inner support fixing mechanism 4 is adjusted to abut against the inner side of the borehole, providing stable support for the fracturing device body 1 without occupying the space below the top plate or affecting the range of movement of the workers. In the inner support fixing mechanism 4, the rotating cylinder 42 is rotated relative to the support cylinder 41. The threaded structure between the support cylinder 41 and the rotating cylinder 42 is engaged, driving the rotating cylinder 42 to move along its axial direction towards the connecting seat 3 on the outside of the support cylinder 41. The rotating cylinder 42 drives the support ring 43 to move synchronously. The support ring 43 drives one end of the connecting rod 45 to move, pushing the diagonal brace 44 to open outward and abut against the inside of the borehole. After the inner support fixing mechanism 4 is fixed to the borehole, the support tube 2 is rotated relative to the support cylinder 41. The threaded structure between the support cylinder 41 and the support tube 2 is engaged, driving the support tube 2 to move the fracturing device body 1 at one end of its axial direction inside the borehole, thereby adjusting the position of the fracturing device body 1.

[0025] In some embodiments, an inner support plate 46 is hinged to one end of the diagonal brace 44 away from the support cylinder 41. The inner support plate 46 is an arc-shaped plate. When the diagonal brace 44 is opened, it pushes the inner support plate 46 to contact the inner wall of the borehole. The inner support plate 46 is hinged to one end of the support cylinder 41, so that the inner support plate 46 can be adjusted accordingly when it contacts the inner wall of the borehole, so that the outer side of the inner support plate 46 fits well with the inner wall of the borehole. The inner support plate 46 increases the contact area with the inner wall of the borehole, thereby improving the stability of the support.

[0026] In some embodiments, the inner support plate 46 is provided with inverted teeth 47 evenly on the side opposite to the diagonal brace 44. The inverted teeth 47 and the inner support plate 46 are an integral structure. The inverted teeth 47 are used to increase the friction between the inner support plate 46 and the inner wall of the borehole and prevent the inner support plate 46 from slipping.

[0027] In some embodiments, as a specific connection method between the support ring 43 and the rotating cylinder 42, an annular groove 421 is formed on the outer side of one end of the rotating cylinder 42 near the support ring 43, and a retaining ring 431 is rotatably disposed inside the annular groove 421, with one side of the retaining ring 431 fixedly connected to one side of the support ring 43.

[0028] In some embodiments, a first handle 21 is symmetrically arranged on the end of the support tube 2 away from the connecting seat 3; a second handle 411 is symmetrically arranged on the end of the support cylinder 41 away from the connecting seat 3; and a third handle 421 is symmetrically arranged on the end of the rotating cylinder 42 away from the connecting seat 3. The second handle 411 and the third handle 421 facilitate the rotation adjustment of the rotating cylinder 42 on the outside of the support cylinder 41. The first handle 21 and the second handle 411 facilitate the rotation adjustment of the support tube 2 on the outside of the support cylinder 41.

[0029] More specifically, power assist sleeves can be fitted onto the outer sides of the first handle 21, the second handle 411, and the third handle 421 to provide assistance. By using the power assist sleeves to increase the power arm, when the resistance and the resistance arm remain unchanged, the increase in the power arm will directly reduce the required power, making the adjustment operation more effortless.

[0030] In the above embodiments, the fracturing device body 1 is a use of the prior art. This application does not involve any improvement to the fracturing device body 1. The structure of the fracturing device body 1 can be referred to a carbon dioxide fracturing device based on metal wire electric explosion disclosed in Chinese utility model patent document CN220689917U. The hollow structure of the support tube 2 is reserved for the cable and liquid carbon dioxide delivery tube.

[0031] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0032] The above embodiments only illustrate some implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A roof fracturing device for coal mining faces, characterized in that: It includes an internal support fixing mechanism, with a support tube internally threadedly connected to the internal support fixing mechanism. A connecting seat is rotatably provided at one end of the support tube, and a fracturing device body is detachably fixed at the end of the connecting seat opposite to the support tube. The internal support fixing mechanism has a support cylinder threaded onto the outside of the support tube, and a rotating cylinder threaded onto the outside of the support cylinder. A support ring is rotatably connected to the outside of the rotating cylinder near the connecting seat. Diagonal braces are arranged in a circular array on the outside of the support cylinder near the connecting seat. One end of each diagonal brace is hinged to the support cylinder, and a connecting rod is hinged to the middle of each diagonal brace. The end of the connecting rod opposite to the diagonal brace is hinged to the outside of the support ring.

2. The roof fracturing device for coal mining faces according to claim 1, characterized in that: An inner support plate is hinged to one end of the diagonal brace away from the support cylinder. The inner support plate is an arc-shaped plate.

3. The roof fracturing device for coal mining faces according to claim 2, characterized in that: The inner support plate has evenly spaced reverse teeth on the side opposite to the diagonal brace, and the reverse teeth are integral with the inner support plate.

4. The roof fracturing device for coal mining faces according to claim 1, characterized in that: The rotating cylinder has an annular groove starting from the outer side of one end near the support ring. A retaining ring is rotatably disposed inside the annular groove, and one side of the retaining ring is fixedly connected to one side of the support ring.

5. The roof fracturing device for coal mining faces according to claim 1, characterized in that: A first handle is symmetrically arranged on one end of the support tube opposite to the connecting seat.

6. The roof fracturing device for coal mining faces according to claim 1, characterized in that: A second handle is symmetrically arranged on one end of the support cylinder opposite to the connecting seat.

7. The roof fracturing device for coal mining faces according to claim 1, characterized in that: A third handle is symmetrically arranged on the rotating cylinder at the end opposite to the connecting seat.

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