Coal seam gas drainage borehole anti-collapse support device and support method

Abstract

The present invention provides a collapse prevention and support device and a support method for a coal seam gas drainage borehole, including a support screen pipe. The support screen pipe includes a plurality of screen pipe fixing plates, and two adjacent screen pipe fixing plates are respectively connected by screen pipe movable parts; a damping component, which is slidably connected to the screen pipe fixing plate and is used for collapse prevention and support of the coal seam gas drainage borehole; a telescopic control component, and the central pipe is respectively connected to a plurality of damping components through a plurality of telescopic control components. The present invention can adjust the positions of structures such as the screen pipe fixing plate by using the telescopic control component, so that the support screen pipe can be telescopic, thereby facilitating the placement of the support screen pipe into the coal seam gas drainage borehole. The support screen pipe can be unfolded. During the unfolding process of the support screen pipe, the damping component first contacts the coal seam borehole wall and generates secondary stress disturbance on the coal seam, which is beneficial to gas drainage. When the support screen pipe is fully unfolded and the damping component has been inserted into the coal seam, it can reduce the damage of the coal seam to structures such as the screen pipe and play a supporting role in the coal seam gas drainage borehole.

Description

Technical Field

[0001] The present invention relates to the field of coal seam gas drainage, and particularly to an anti-collapse support device and a support method for coal seam gas drainage boreholes. Background Art

[0002] Coal seam gas is a mixed gas composed of methane, carbon dioxide, nitrogen, etc. escaping from coal and surrounding rocks. Gas is a colorless, odorless, tasteless gas that can burn or explode, is insoluble in water, has a higher diffusivity than air, is non-toxic, but can cause asphyxiation when its concentration is very high. The occurrence forms of gas in coal seams mainly have two states. The gas in the permeable space is mainly in the free gas state, called free gas or free gas, and the gas in this state obeys the ideal gas state equation. The other is called adsorbed gas, which is mainly adsorbed on the microporous surface of coal and inside coal particles, occupying the vacant positions of coal molecular structures or the spaces between coal molecules. When mining coal seams, the coal body is damaged or affected by mining, and part of the gas stored in the coal body will leave the coal body and flow into the mining space.

[0003] Since the coal body is relatively soft in high-gas soft coal seams, long-distance directional boreholes are prone to the phenomenon of borehole collapse after hole formation, resulting in borehole blockage or even abandonment, severely restricting the efficient drainage of underground gas and affecting the safe production of mines. In order to prevent borehole collapse in different coal seams, different working faces, and different stress environments, the innovation and upgrade of borehole collapse prevention technologies and methods are extremely important. In the authorized Chinese utility model patent "Publication No.: CN214660327U, Name: Support Device for Coal Seam Gas Drainage Boreholes", by setting a check component on the support main body, when the support feet pop out and support in the borehole, the check component is in an open state and is placed between the support feet and the support main body. When the support feet rotate towards the receiving groove, they are restricted by the check component and clamped outside the receiving groove, effectively preventing the support feet supported in the borehole from shrinking back into the receiving groove, ensuring the effective support of the support feet in the borehole, preventing borehole collapse, and ensuring the smooth progress of gas drainage work. However, in the above application, it is difficult to open the support feet in the borehole, the support performance is poor, the structural strength is low, the acting force of the coal seam on the support device is large, and the support device is easily damaged. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of difficult installation and poor support performance in the prior art, and provide an anti-collapse support device and a support method for coal seam gas drainage boreholes.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The present invention provides a collapse prevention and support device and a support method for coal seam gas drainage boreholes, including a support screen pipe, the support screen pipe includes a plurality of screen pipe fixing plates, and two adjacent screen pipe fixing plates are respectively connected through screen pipe movable parts;

[0007] A damping component, a plurality of damping components are arranged inside the screen pipe fixing plate, the damping component is slidably connected with the screen pipe fixing plate, and the damping component is used for preventing collapse and supporting the coal seam gas drainage borehole;

[0008] A central pipe, the central pipe is arranged inside the screen pipe fixing plate;

[0009] A telescopic control component, the central pipe is respectively connected with a plurality of damping components through a plurality of telescopic control components.

[0010] In this technical solution, the telescopic control component can be used to adjust the positions of structures such as the screen pipe fixing plate, so that the support screen pipe can be telescoped, thus facilitating the placement of the support screen pipe into the coal seam gas drainage borehole. The telescopic control component can be used to expand the support screen pipe. The damping component first contacts the coal seam borehole wall and generates secondary stress disturbance to the coal seam, which is beneficial to gas drainage. When the support screen pipe is fully expanded and the damping component has been inserted into the coal seam, it can reduce the damage of the coal seam to structures such as the screen pipe and play a supporting role in the coal seam gas drainage borehole.

[0011] Preferably, the screen pipe movable part includes an extension plate and an anti - detachment plate. Both sides of the extension plate are connected with anti - detachment plates, and the two anti - detachment plates are respectively slidably connected with the two screen pipe fixing plates.

[0012] In this technical solution, the screen pipe movable part can be used to movably connect two screen pipe fixing plates.

[0013] Preferably, movable cavities are opened on both sides of the screen pipe fixing plate, and the anti - detachment plate is arranged in the movable cavity.

[0014] In this technical solution, the anti - detachment plate can be used to prevent the extension plate from disengaging from the screen pipe fixing plate.

[0015] Preferably, a plurality of communication ports are opened on the extension plate.

[0016] In this technical solution, coal seam gas, etc. enter the support screen pipe through the communication ports.

[0017] Preferably, the damping component includes an anti - exit plate and damping blocks, and a plurality of damping blocks are connected to one side of the anti - exit plate;

[0018] The screen pipe fixing plate is provided with a telescopic opening, and one end of the damping block extends to the outside of the screen pipe fixing plate through the telescopic opening.

[0019] In this technical solution, the damping component can be used to increase the contact area between the support screen pipe and the coal seam, and can support the protection screen pipe in the borehole.

[0020] Preferably, the damping block is wrapped outside the support skeleton, and one side of the support skeleton is connected to one side of the anti-out plate;

[0021] A positioning column is connected at the telescopic opening, and the surface of the positioning column is slidably and penetratingly connected with the support skeleton.

[0022] In this technical solution, the positioning column is used to enable the damping block to move at the screen pipe fixing plate, and can also drive the screen pipe fixing plate to move.

[0023] Preferably, the telescopic control component includes a threaded shaft, the threaded shaft is arranged inside the central pipe, and a plurality of moving plates are threadedly connected to the surface of the threaded shaft;

[0024] A plurality of control columns distributed in an annular array are arranged on the side surface of the moving plate, and rotating frames are respectively rotatably connected to both ends of the control column;

[0025] One of the rotating frames is connected to the side surface of the moving plate, and the other rotating frame is connected to one side of the anti-out plate.

[0026] In this technical solution, the telescopic control component can drive structures such as the damping component and the screen pipe fixing plate to move, so that the screen pipe fixing plate and the damping component can be extended and contracted.

[0027] Preferably, a plurality of support plates are connected to the inner wall of the central pipe, and the surface of the threaded shaft is rotatably and penetratingly connected with the support plates.

[0028] In this technical solution, the support plates can support the threaded shaft.

[0029] Preferably, adjacent two screen pipe fixing plates are connected by a disassembly and assembly mechanism, the disassembly and assembly mechanism includes a plurality of disassembly and assembly components and a follow-up component, adjacent two disassembly and assembly components are connected by the follow-up component, and both sides of the disassembly and assembly component are detachably connected to the two screen pipe fixing plates respectively;

[0030] The disassembly and assembly component includes a fixing frame, the cross section of the fixing frame is in an H-shaped structure, and the fixing frame and the outside of the damping component are detachably connected by a plurality of disassembly and assembly bolts;

[0031] The follow-up component includes a telescopic support column, both ends of the telescopic support column are slidably and penetratingly connected to the side surfaces of the two fixing frames respectively, elastic shielding belts are arranged on both sides of the fixing frame respectively, and both ends of the elastic shielding belt are connected to the side surface of the fixing frame respectively;

[0032] The follower assembly further includes a special-shaped column. One end of the central tube is connected to the special-shaped column, and the other end of the central tube is provided with a special-shaped groove.

[0033] In this technical solution, the disassembly and assembly mechanism can be used to complete the installation and disassembly between adjacent support screen pipes, which is convenient for changing the length of the support device and facilitates the use, transportation, and storage of the support device.

[0034] The support method includes the following operating steps:

[0035] Step 1: Length control. According to the length of the coal seam gas drainage borehole, a plurality of screen pipe fixing plates are sequentially connected to form a support screen pipe of the corresponding length. When connecting, place two support screen pipes in the fixing frame. At this time, adjust the angles of the central tube and the fixing frame so that the special-shaped column at one central tube is installed into the special-shaped groove at the other central tube, and then sequentially install a plurality of disassembly and assembly bolts to complete the connection of the two support screen pipes. Then, sequentially connect a plurality of support screen pipes to form a support screen pipe of the corresponding length.

[0036] Step 2: Place the support screen pipe. Lower the support screen pipe into the coal seam gas drainage borehole.

[0037] Step 3: Anti-collapse support. Pull the threaded shaft, thereby driving the moving plate to move, and cooperate with the rotating frame to make the control column move outward from the screen pipe fixing plate. At this time, the anti-out plate can be driven to move outward from the screen pipe fixing plate, and then the support skeleton and the damping block can be driven to move outward from the screen pipe fixing plate. Extend the damping block out of the screen pipe fixing plate, and then continue to drive the screen pipe fixing plate to move outward, so as to expand a plurality of screen pipe fixing plates. When the screen pipe fixing plate moves, make a plurality of damping components move outward respectively. At this time, the extension plate can be exposed. Finally, the damping block is inserted into the coal body, and the screen pipe fixing plate is in close contact with the wall of the coal seam gas drainage borehole.

[0038] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred examples of the present invention.

[0039] The positive and progressive effects of the present invention are as follows:

[0040] The present invention uses the telescopic control component to adjust the positions of structures such as the screen pipe fixing plate, so that the support screen pipe can be telescopic, which is convenient for putting the support screen pipe into the coal seam gas drainage borehole. The telescopic control component can be used to expand the support screen pipe. During the expansion process of the support screen pipe, the damping component first contacts the wall of the coal seam borehole and generates secondary stress disturbance to the coal seam, which is beneficial to gas drainage. When the support screen pipe is fully expanded, the damping component has been inserted into the coal seam, which can reduce the damage of the coal seam to structures such as the screen pipe and play a supporting role in the coal seam gas drainage borehole. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1Schematic structural diagram of the anti-collapse support device and support method for coal seam gas drainage boreholes in the embodiments of the present invention.

[0042] Figure 2 For Figure 1 Schematic side view structural diagram of the overall contraction state of the anti-collapse support device and support method for coal seam gas drainage boreholes shown.

[0043] Figure 3 For Figure 1 Schematic side view structural diagram of the overall deployment state of the anti-collapse support device and support method for coal seam gas drainage boreholes shown.

[0044] Figure 4 For Figure 1 Schematic internal structural diagram of the overall anti-collapse support device and support method for coal seam gas drainage boreholes shown.

[0045] Figure 5 For Figure 1 Schematic sectional structural diagram of the retracted state of the telescopic control component of the anti-collapse support device and support method for coal seam gas drainage boreholes shown.

[0046] Figure 6 For Figure 1 Schematic sectional structural diagram of the damping component of the anti-collapse support device and support method for coal seam gas drainage boreholes shown.

[0047] Figure 7 For Figure 1 Schematic sectional structural diagram of the disassembly and assembly component and the follow-up component of the anti-collapse support device and support method for coal seam gas drainage boreholes shown.

[0048] Figure 8 For Figure 4 Schematic enlarged partial structural diagram at position A of the anti-collapse support device and support method for coal seam gas drainage boreholes shown.

[0049] Explanation of reference numerals

[0050] 1. Screen pipe fixing plate;

[0051] 2. Screen pipe movable part; 21. Extension plate; 22. Anti-disengagement plate;

[0052] 3. Damping component; 31. Anti-out plate; 32. Damping block; 33. Support skeleton; 34. Positioning column;

[0053] 4. Central pipe;

[0054] 5. Telescopic control component; 51. Threaded shaft; 52. Moving plate; 53. Control column; 54. Rotating frame; 55. Support plate;

[0055] 6. Disassembly and assembly component; 61. Fixed frame; 62. Disassembly and assembly bolt;

[0056] 7. Follow-up component; 71. Telescopic support; 72. Elastic shielding band; 73. Special-shaped column; 74. Special-shaped groove. Detailed implementation manner

[0057] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the described embodiments.

[0058] Figures 1 to 8 The figure shows a schematic structural diagram of an embodiment of a coal seam gas drainage borehole anti-collapse support device and a support method of the present invention. The coal seam gas drainage borehole anti-collapse support device and the support method include a support screen pipe, and the support screen pipe includes a plurality of screen pipe fixing plates 1. Two adjacent screen pipe fixing plates 1 are respectively connected by a screen pipe movable member 2;

[0059] Damping component 3. A plurality of damping components 3 are arranged inside the screen pipe fixing plate 1. The damping component 3 is slidably connected to the screen pipe fixing plate 1, and the damping component 3 is used for anti-collapse support of the coal seam gas drainage borehole;

[0060] Central pipe 4. The central pipe 4 is arranged inside the screen pipe fixing plate 1;

[0061] Telescopic control component 5. The central pipe 4 is respectively connected to a plurality of damping components 3 through a plurality of telescopic control components 5.

[0062] In this technical solution, the telescopic control component 5 can be used to adjust the positions of structures such as the screen pipe fixing plate 1, so that the support screen pipe can be telescoped, thereby facilitating the placement of the support screen pipe into the coal seam gas drainage borehole. The telescopic control component 5 can be used to expand the support screen pipe. At this time, the damping component 3 is in contact with the coal seam borehole wall, and the damping component 3 is used to perform secondary disturbance on the coal seam pressure, which is beneficial to gas extraction and can reduce the damage of the coal seam to structures such as the screen pipe fixing plate 1, and play a supporting role in the coal seam gas drainage borehole.

[0063] The screen pipe movable member 2 includes an extension plate 21 and an anti-disengagement plate 22. Both sides of the extension plate 21 are connected with anti-disengagement plates 22, and the two anti-disengagement plates 22 are respectively slidably connected to the two screen pipe fixing plates 1.

[0064] In this technical solution, the screen pipe movable member 2 can be used to movably connect the two screen pipe fixing plates 1.

[0065] Activity cavities are formed on both sides of the screen pipe fixing plate 1, and the anti-disengagement plate 22 is arranged in the activity cavity.

[0066] In this technical solution, the anti-disengagement plate 22 can be used to prevent the extension plate 21 from disengaging from the screen pipe fixing plate 1.

[0067] The extension plate 21 is provided with a plurality of communication ports.

[0068] In this technical solution, coal seam gas, etc. enter the support screen pipe through the communication port.

[0069] During use, the screen pipe fixing plate 1 moves under the control of the damping component 3 and the telescopic control component 5, so that the screen pipe fixing plate 1 can receive and spit out the extension plate 21, thereby completing the contraction and extension of the support screen pipe.

[0070] The damping component 3 includes an anti-out plate 31 and damping blocks 32. A plurality of damping blocks 32 are connected to one side of the anti-out plate 31;

[0071] The screen pipe fixing plate 1 is provided with a telescopic opening, and one end of the damping block 32 extends to the outside of the screen pipe fixing plate 1 through the telescopic opening.

[0072] In this technical solution, the use of the damping component 3 can increase the contact area between the support screen pipe and the coal seam, and can support the protection screen pipe in the borehole.

[0073] During use, when there is a force on the support screen pipe from the coal seam in the borehole, the damping block 32 can reduce the damage to the screen pipe and play a supporting role, and the two damping blocks 32 in opposite directions can support each other.

[0074] The damping block 32 can increase the contact area between the support screen pipe and the coal seam, and increase the gas extraction efficiency.

[0075] The damping block 32 is wrapped outside the support skeleton 33, and one side of the support skeleton 33 is connected to one side of the anti-out plate 31;

[0076] A positioning column 34 is connected at the telescopic opening, and the surface of the positioning column 34 is slidably penetrated and connected with the support skeleton 33.

[0077] In this technical solution, the positioning column 34 is used to enable the damping block 32 to move at the screen pipe fixing plate 1, and at the same time, it can also drive the screen pipe fixing plate 1 to move.

[0078] During use, after the support screen pipe is sent into the coal seam gas extraction borehole, the telescopic control component 5 controls the movement of the anti-out plate 31, thereby driving the damping block 32 and the support skeleton 33 to move outward from the screen pipe fixing plate 1. After the damping block 32 exposes the screen pipe fixing plate 1, the anti-out plate 31 continues to push the screen pipe fixing plate 1 and the positioning column 34 to move in the same direction, thereby completing the extension of the support screen pipe;

[0079] During contraction, the opposite method can be used. The contracted support screen pipe can be easily sent into the coal seam gas extraction borehole.

[0080] The telescopic control component 5 includes a threaded shaft 51. The threaded shaft 51 is arranged inside the central pipe 4, and a plurality of moving plates 52 are threadedly connected to the surface of the threaded shaft 51;

[0081] A plurality of control columns 53 distributed in an annular array are arranged on the side surface of the moving plate 52, and rotating frames 54 are rotatably connected to both ends of the control column 53 respectively;

[0082] The rotating frame 54 on one side is connected to the side surface of the moving plate 52, and the rotating frame 54 on the other side is connected to one side of the anti-out plate 31.

[0083] In this technical solution, the telescopic control component 5 can drive structures such as the damping component 3 and the sieve tube fixing plate 1 to move, so that the sieve tube fixing plate 1 and the damping component 3 can be extended and contracted.

[0084] A plurality of support plates 55 are connected to the inner wall of the central tube 4, and the surface of the threaded shaft 51 is rotatably and penetratingly connected to the support plates 55.

[0085] In this technical solution, the support plate 55 can support the threaded shaft 51.

[0086] During use, pull the threaded shaft 51, thereby driving the moving plate 52 to move. At this time, with the cooperation of the rotating frame 54, the control column 53 can be driven to move outward, thereby driving the anti-out plate 31 to move, and further controlling the extension and contraction of the sieve tube fixing plate 1.

[0087] Adjacent two sieve tube fixing plates 1 are connected by a disassembly and assembly mechanism. The disassembly and assembly mechanism includes a plurality of disassembly and assembly components 6 and a follow-up component 7. Adjacent two disassembly and assembly components 6 are connected by the follow-up component 7. Both sides of the disassembly and assembly component 6 are detachably connected to the two sieve tube fixing plates 1 respectively;

[0088] The disassembly and assembly component 6 includes a fixing frame 61. The cross-section of the fixing frame 61 is in an H-shaped structure. The fixing frame 61 and the outside of the damping component 3 are detachably connected by a plurality of disassembly and assembly bolts 62;

[0089] The follow-up component 7 includes a telescopic support column 71. Both ends of the telescopic support column 71 are slidably and penetratingly connected to the side surfaces of the two fixing frames 61 respectively. Elastic shielding belts 72 are arranged on both sides of the fixing frame 61 respectively. Both ends of the elastic shielding belt 72 are connected to the side surface of the fixing frame 61 respectively;

[0090] The follow-up component 7 further includes a special-shaped column 73. One end of the central tube 4 is connected to the special-shaped column 73, and the other end of the central tube 4 is provided with a special-shaped groove 74.

[0091] In this technical solution, the disassembly and assembly mechanism can complete the installation and disassembly between adjacent support sieve tubes, which is convenient for changing the length of the support device and is convenient for the use, transportation and storage of the support device.

[0092] In use, according to the length of the coal seam gas drainage borehole, the sieve tube fixing plates 1 on both sides are respectively placed on both sides of the fixing frame 61. At this time, the special-shaped column 73 at one central tube 4 is installed into the special-shaped groove 74 at the other central tube 4, and then a plurality of disassembly and assembly bolts 62 are sequentially installed to connect the sieve tube fixing plate 1 and the fixing frame 61, completing the connection between the two support sieve tubes. Then, a plurality of support sieve tubes can be sequentially connected in the same way, so as to change the length of the support device.

[0093] The support method includes the following operating steps:

[0094] Step 1: Length control. According to the length of the coal seam gas drainage borehole, a plurality of sieve tube fixing plates 1 are sequentially connected to form a support sieve tube of corresponding length. When connecting, the two support sieve tubes are placed in the fixing frame 61. At this time, the angles of the central tube 4 and the fixing frame 61 are adjusted so that the special-shaped column 73 at one central tube 4 is installed into the special-shaped groove 74 at the other central tube 4, and then a plurality of disassembly and assembly bolts 62 are sequentially installed to complete the connection between the two support sieve tubes. Then, a plurality of support sieve tubes are sequentially connected to form a support sieve tube of corresponding length.

[0095] Step 2: Place the support sieve tube. Lower the support sieve tube into the coal seam gas drainage borehole.

[0096] Step 3: Anti-collapse support. Pull the threaded shaft 51, thereby driving the moving plate 52 to move. Cooperating with the rotating frame 54, the control column 53 moves towards the outside of the sieve tube fixing plate 1. At this time, the anti-out plate 31 can be driven to move towards the outside of the sieve tube fixing plate 1, and then the support skeleton 33 and the damping block 32 are driven to move towards the outside of the sieve tube fixing plate 1, extending the damping block (32) out of the sieve tube fixing plate 1. Then, continue to drive the sieve tube fixing plate 1 to move outwards, so as to unfold a plurality of sieve tube fixing plates 1. When the sieve tube fixing plate 1 moves, the plurality of damping components 3 move outwards respectively. At this time, the extension plate 21 can be exposed. Finally, the damping block 32 is inserted into the coal body, and the sieve tube fixing plate 1 is in close contact with the wall of the coal seam gas drainage borehole.

[0097] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that this is only an example. The protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A coal seam gas drainage borehole anti-collapse support device, characterized in that: It includes a support screen pipe, and the support screen pipe includes a plurality of screen pipe fixing plates (1), and two adjacent screen pipe fixing plates (1) are respectively connected through a screen pipe movable member (2); The screen pipe movable member (2) includes an extension plate (21) and an anti - detachment plate (22), both sides of the extension plate (21) are connected with anti - detachment plates (22), and the two anti - detachment plates (22) are respectively slidably connected with the two screen pipe fixing plates (1); Damping components (3), a plurality of damping components (3) are arranged inside the screen pipe fixing plate (1), the damping components (3) are slidably connected with the screen pipe fixing plate (1), and the damping components (3) are used for anti - collapse support of coal seam gas drainage boreholes; The damping component (3) includes an anti - ejection plate (31) and damping blocks (32), and a plurality of damping blocks (32) are connected to one side of the anti - ejection plate (31); The screen pipe fixing plate (1) is provided with a telescopic opening, and one end of the damping block (32) extends to the outside of the screen pipe fixing plate (1) through the telescopic opening; A central pipe (4) is arranged inside the screen pipe fixing plate (1); A telescopic control component (5), the central pipe (4) is respectively connected with a plurality of damping components (3) through a plurality of telescopic control components (5); The telescopic control component (5) includes a threaded shaft (51), the threaded shaft (51) is arranged inside the central pipe (4), and a plurality of moving plates (52) are threadedly connected to the surface of the threaded shaft (51); A plurality of control columns (53) distributed in an annular array are arranged on the side surface of the moving plate (52), and both ends of the control column (53) are respectively rotatably connected with a rotating frame (54); One side of the rotating frame (54) is connected to the side surface of the moving plate (52), and the other side of the rotating frame (54) is connected to one side of the anti - ejection plate (31).

2. The anti-collapse support device for coal seam gas drainage boreholes according to claim 1, wherein: Activity cavities are arranged on both sides of the screen pipe fixing plate (1), and the anti - detachment plate (22) is arranged in the activity cavity.

3. The coal seam gas drainage borehole anti-collapse support device according to claim 2, characterized in that: A plurality of communication ports are arranged on the extension plate (21).

4. The anti-collapse support device for coal seam gas drainage boreholes according to claim 3, characterized in that: The damping block (32) is wrapped outside a support skeleton (33), and one side of the support skeleton (33) is connected to one side of the anti - ejection plate (31); A positioning column (34) is connected at the telescopic opening, and the surface of the positioning column (34) is slidably penetrated and connected with the support skeleton (33).

5. The anti-collapse support device for coal seam gas drainage boreholes according to claim 4, wherein: A plurality of support plates (55) are connected to the inner wall of the central pipe (4), and the surface of the threaded shaft (51) is rotatably penetrated and connected with the support plates (55).

6. The anti-collapse support device for coal seam gas drainage boreholes according to claim 5, characterized in that: Two adjacent screen pipe fixing plates (1) are connected through a disassembly and assembly mechanism, the disassembly and assembly mechanism includes a plurality of disassembly and assembly components (6) and a follow - up component (7), two adjacent disassembly and assembly components (6) are connected through the follow - up component (7), and both sides of the disassembly and assembly component (6) are respectively detachably connected with the two screen pipe fixing plates (1); The disassembly and assembly component (6) includes a fixing frame (61), the cross - section of the fixing frame (61) is in an H - shaped structure, and the fixing frame (61) and the outside of the damping component (3) are detachably connected through a plurality of disassembly and assembly bolts (62); The follower assembly (7) includes a telescopic support column (71). Both ends of the telescopic support column (71) are slidably and penetratingly connected to the sides of two fixing frames (61). Elastic shielding bands (72) are respectively arranged on both sides of the fixing frame (61), and both ends of the elastic shielding bands (72) are respectively connected to the side of the fixing frame (61). The follower assembly (7) further includes a special-shaped column (73). One end of the central tube (4) is connected to the special-shaped column (73), and the other end of the central tube (4) is provided with a special-shaped groove (74).

7. The support method adopted during the support process of the anti-collapse support device for coal seam gas drainage boreholes as described in claim 6, characterized in that: The support method includes the following operating steps: Step 1, length control: According to the length of the coal seam gas drainage borehole, a plurality of screen pipe fixing plates (1) are sequentially connected to form a support screen pipe of the corresponding length. When connecting, two support screen pipes are placed in the fixing frame (61). At this time, the angles of the central tube (4) and the fixing frame (61) are adjusted so that the special-shaped column (73) at one central tube (4) is installed into the special-shaped groove (74) at the other central tube (4). Then, a plurality of disassembly and assembly bolts (62) are sequentially installed to complete the connection of the two support screen pipes. Then, a plurality of support screen pipes are sequentially connected to form a support screen pipe of the corresponding length. Step 2, placing the support screen pipe: Lower the support screen pipe into the coal seam gas drainage borehole. Step 3, anti-collapse support: Pull the threaded shaft (51), thereby driving the moving plate (52) to move. Cooperating with the rotating frame (54), the control column (53) moves towards the outside of the screen pipe fixing plate (1). At this time, the anti-out plate (31) can be driven to move towards the outside of the screen pipe fixing plate (1), and further drive the support frame (33) and the damping block (32) to move towards the outside of the screen pipe fixing plate (1). The damping block (32) is extended out of the screen pipe fixing plate (1), and then continue to drive the screen pipe fixing plate (1) to move outwards, so as to expand a plurality of screen pipe fixing plates (1). When the screen pipe fixing plate (1) moves, a plurality of damping components (3) move outwards respectively. At this time, the expansion plate (21) can be exposed. Finally, the damping block (32) is inserted into the coal body, and the screen pipe fixing plate (1) is in close contact with the wall of the coal seam gas drainage borehole.

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