Gas fracturing anti-reflection device for deep coal rock impacted by blasting gas

Abstract

The invention discloses a deep coal and rock gas fracturing and permeability increasing device impacted by blasting gas, and belongs to the technical field of deep coal and rock gas fracturing and permeability increasing. The deep coal and rock gas fracturing and permeability increasing device impacted by the blasting gas comprises a gas inlet pipe for controlling hydrogen and oxygen gas conveying, a mixing tank is connected to the gas inlet pipe in a penetrating mode, and a combustion tank is fixedly connected to the mixing tank; a flame arrester for preventing combustion backfire is mounted between the combustion tank and the mixing tank, and an igniter is fixedly mounted in the combustion tank; a flow control valve for controlling gas circulation and a pressure sensor are mounted on the gas inlet pipe; the end, away from the flame arrester, of the combustion tank is provided with an energy-gathered nozzle, the energy-gathered nozzle is covered with a hollow guide column, the hollow guide column is rotationally provided with a guide ring plate, and the end face of the combustion tank is provided with a steering mechanism for regulating and controlling the hollow guide column to optimize the direction of high-temperature and high-pressure gas. And the output direction of high-temperature and high-pressure gas guided by the hollow guide column and the guide ring plate is adjusted, so that cracks are formed more accurately, and the fracturing effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of deep coal rock gas fracturing and permeability improvement, in particular to a deep coal rock gas fracturing and permeability improvement device impacted by blasting gas. BACKGROUND

[0002] With the development of unconventional natural gas resources, deep coal rock gas reservoirs have gradually become an important development target. However, the existing hydraulic fracturing technology faces the following problems in the application of low-rank deep coal rock gas reservoirs: it is difficult to fracture deep reservoirs, and traditional hydraulic fracturing cannot effectively form a complex fracture network; chemical fracturing agents may pollute the environment, especially the potential threat to groundwater resources; the fracture control effect is limited, and it is difficult to achieve directional and effective reservoir modification.

[0003] A coal rock mass hydraulic fracturing and permeability improvement effect quantification method based on DEM is disclosed in the patent with publication number CN116644677B. The coal rock mass sample is dispersed into a set of rigid particles, and a discrete element particle assembly is established. The particles are combined into a BPM model by assigning contact forces between the particles. Fluid, fluid domain and fluid pipeline are introduced into the BPM model to realize the seepage action of the particle assembly. Fluid mechanics parameters are assigned. The BPM model is assigned with a hydraulic fracturing simulation. Under the same steady-state parameters, the permeability of the BPM model before and after hydraulic fracturing is measured. By comparing the permeability, the hydraulic fracturing and permeability improvement effect of the BPM model is quantified. The simulation effect is accurate and reliable, and is not limited to specific rock or fracturing fluid. For complex geological conditions that are difficult to reproduce in physical experiments, simulation can easily achieve the desired results.

[0004] A deep gas-containing coal rock pulsating fracturing experimental system is disclosed in the patent with publication number CN112067480B. The system includes a triaxial holder connected to six sets of loading devices for applying pressure to the coal sample. The six sets of loading devices are connected to a pulsating pump for providing loading pressure and a first electric control device for controlling the loading devices. The gas inlet of the pulsating pump is connected to a carbon dioxide gas cylinder, and the pulsating pump is connected to a second electric control device for controlling the pulsating pump. The gas inlet of the triaxial holder is connected to a gas main pipe, which is connected to a gas injection device for adsorbing gas in the coal sample, a helium injection device for checking gas tightness, and a vacuum pumping device for pumping. The experimental system can more accurately simulate the stress, seepage and temperature conditions of the coal seam under deep mining conditions, providing guidance for deep coal body fracturing and permeability improvement and regional prevention and control of coal and gas outburst.

[0005] A patent with publication number CN210622784U discloses a device for increasing the permeability of coal and rock by shock wave fracturing of explosion gas, comprising: a detonation tube, a detonation lead, an initiator, a plugging device and explosives; the initiator detonates the explosives through the detonation lead; the explosion of the explosives expands and compresses the detonation tube and the air in the borehole, forming a gas shock wave; the gas shock wave breaks the detonation tube and shakes the coal and rock along the borehole and the annular knife slit. It can be applied to coal and rock of different hardness, and has a wider application range; the high-pressure gas shock wave has strong penetration, can maximize the damage to coal and rock, and the pulse wave generated during segmented and rooted explosion is more powerful; when high-temperature and high-pressure gas is sprayed, if the direction of the sprayed high-temperature and high-pressure gas cannot be controlled, some areas are repeatedly impacted by the gas, forming a single-direction super-deep slit, but the surrounding reservoir is not affected, resulting in that the permeability improvement is concentrated in a small range, the overall reservoir producing rate is low, the direction of the multiple fractures formed by disordered spraying is chaotic, some fractures are squeezed and closed due to stress interference, thereby blocking the original seepage channel, and even causing the permeability of the local reservoir to decrease; in addition, the hydrogen-oxygen combustion reaction rate is extremely fast, but is affected by the uniformity of the mixed gas concentration and the stability of the ignition energy, the gas combustion and spraying process may produce jitter, which further affects the uncontrollable direction of the gas spraying, resulting in fracturing failure.

[0006] In view of the above problems, it is urgent to make innovative design on the basis of the original deep coal and rock gas fracturing and permeability increasing device. SUMMARY

[0007] The purpose of the present application is to provide a deep coal and rock gas fracturing and permeability increasing device for explosion gas shock, to solve the problems of the above background art, that is, some areas are repeatedly impacted by the gas, forming a single-direction super-deep slit, but the surrounding reservoir is not affected, resulting in that the permeability improvement is concentrated in a small range, the overall reservoir producing rate is low, the direction of the multiple fractures formed by disordered spraying is chaotic, some fractures are squeezed and closed due to stress interference, thereby blocking the original seepage channel, and even causing the permeability of the local reservoir to decrease; in addition, the hydrogen-oxygen combustion reaction rate is extremely fast, but is affected by the uniformity of the mixed gas concentration and the stability of the ignition energy, the gas combustion and spraying process may produce jitter, which further affects the uncontrollable direction of the gas spraying, resulting in fracturing failure.

[0008] In order to achieve the above object, the present application provides the following technical scheme: a deep coal rock gas fracturing and permeability improvement device for blasting gas impact, comprising a gas inlet pipe for controlling hydrogen-oxygen gas delivery, a mixing tank is connected through the gas inlet pipe, a combustion tank is fixedly connected to the mixing tank, a flame arrestor is installed between the combustion tank and the mixing tank to prevent backfire, and a igniter is fixedly installed in the combustion tank; a flow control valve and a pressure sensor are installed on the gas inlet pipe to control gas flow; an energy concentrating nozzle is installed at one end of the combustion tank away from the flame arrestor, a hollow guide column is installed outside the energy concentrating nozzle, a guide ring plate is rotatably installed on the hollow guide column, and a steering mechanism is arranged on the end face of the combustion tank to control the direction of high-temperature and high-pressure gas in the hollow guide column.

[0009] Preferably, the steering mechanism comprises a protrusion fixedly installed on the guide ring plate; an electric telescopic rod is rotatably connected to the hollow guide column, and the output end of the electric telescopic rod is rotatably connected to the protrusion.

[0010] Preferably, a driven gear ring is fixedly installed outside the hollow guide column; a fixed rod is connected to the end face of the combustion tank, a hollow ring is fixedly installed on the fixed rod, and the hollow ring is coaxially installed outside the energy concentrating nozzle; a driving gear is rotatably installed on the hollow ring, and the driving gear is meshingly connected to the driven gear ring.

[0011] Preferably, a plurality of positioning assemblies are arranged at equal angles along the axial direction on the hollow ring, and the positioning assemblies are pressed in the coal rock blasting hole to limit the installation position of the combustion tank.

[0012] Preferably, the positioning assembly comprises a positioning sliding rod slidably connected in the hollow ring along the radial direction, and a pressing column is fixedly installed at the end of the positioning sliding rod away from the energy concentrating nozzle.

[0013] Preferably, a disc is fixedly installed on the positioning sliding rod, and a positioning spring is elastically connected between the disc and the hollow ring.

[0014] Preferably, a transmission mechanism is arranged in the hollow ring to control the pressing force of the positioning assembly.

[0015] Preferably, the transmission mechanism comprises a guide frame fixedly installed on the hollow ring, and a moving ring is slidably sleeved on the guide frame; the moving ring is sleeved outside the guide ring plate along the axial direction, and the guide ring plate is rotatably in contact with the inner wall of the moving ring.

[0016] Preferably, a moving bracket is fixedly connected to the moving ring, and the moving bracket is slidably and throughly connected to the guide frame; a linkage telescopic rod is fixedly connected to the inner wall of the hollow ring, a transmission bracket is fixedly connected to the telescopic end of the linkage telescopic rod, a cylindrical rod is fixedly connected to the transmission bracket, a push rod is rotatably connected to the cylindrical rod, and the other end of the push rod is rotatably connected to the moving bracket.

[0017] Preferably, the moving support is fixedly provided with a sliding frame, a longitudinal sliding rod is slidably connected in the sliding frame, and the longitudinal sliding rod is fixedly provided on the positioning sliding rod.

[0018] Compared with the prior art, the beneficial effects of the present application are that the deep coal rock gas fracturing and permeability improvement device impacted by the blasting gas can realize efficient crack expansion of the coal rock mass by conveying hydrogen-oxygen mixed gas into the combustion tank, triggering combustion of the hydrogen-oxygen mixed gas under the action of ignition, and spraying the combustion gas outward through the energy-gathering nozzle to act on the deep coal rock gas reservoir, forming a complex crack network by using combustion energy to improve the permeability and mining efficiency of the coal bed gas.

[0019] The combustion tank end face is provided with a turning mechanism for regulating and controlling the direction of high-temperature and high-pressure gas optimized by the hollow guide column. During the combustion of the mixed gas, the spraying direction of the combustion gas is regulated and controlled according to the needs of deep coal rock gas mining. The turning of the guide ring plate connected to the hollow guide column can preliminarily regulate and control the spraying direction of the combustion gas.

[0020] Through the meshing transmission of the driving gear and the driven gear ring, the hollow guide column can be driven to rotate, the hollow guide column drives the guide ring plate to rotate in a circle, the corresponding direction of the rotation of the guide ring plate is further regulated and controlled, the output direction of the high-temperature and high-pressure gas is optimized, the crack formation is more accurate, and the gas output direction can be regulated and controlled during the spraying process to avoid repeated impact on some positions of the reservoir to form a single-direction super-deep crack, and the uniformity of the crack formation of the reservoir is maintained.

[0021] A plurality of positioning components are arranged at equal angles along the axial direction on the hollow ring. When the combustion tank is installed in the coal rock blasting hole, the plurality of positioning components distributed outside the energy-gathering nozzle can stably position the layout of the combustion tank to avoid position movement caused by gas fluctuation interference.

[0022] The positioning component is pressed in the coal rock blasting hole to limit the installation position of the combustion tank. When the gas guide angle of the rotating guide ring plate is regulated and controlled, the rotating guide ring plate can push and move the moving ring. The moving ring moves to drive the moving support to move synchronously. Under the transmission of the push rod, the cylindrical rod, the moving support, the sliding frame and the longitudinal sliding rod, the compression column in the positioning component can be moved and pressed on the inner wall of the blasting hole, so that the fracturing and permeability improvement device is more stable, and the high-temperature and high-pressure gas is stably sprayed outward from the energy-gathering nozzle. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a combustion tank structure schematic diagram of the present application.

[0024] Figure 2 It is an igniter structure schematic diagram of the present application.

[0025] Figure 3The schematic view of the guide ring plate structure of the present application.

[0026] Figure 4 The schematic view of the hollow ring structure of the present application.

[0027] Figure 5 The schematic view of the hollow guide column structure of the present application.

[0028] Figure 6 The schematic view of the electric telescopic rod structure of the present application.

[0029] Figure 7 The schematic view of the driven gear ring and driving gear structure of the present application.

[0030] Figure 8 The schematic view of the positioning assembly structure of the present application.

[0031] Figure 9 The schematic view of the moving support structure of the present application.

[0032] Figure 10 The schematic view of the pressing column structure of the present application.

[0033] Figure 11 The schematic view of the push rod structure of the present application.

[0034] Figure 12 The schematic view of the sliding frame and longitudinal sliding rod structure of the present application.

[0035] In the figure: 1, air inlet pipe; 2, mixing tank; 3, combustion tank; 4, flame arrestor; 5, igniter; 6, flow control valve; 7, pressure sensor; 8, converging nozzle; 9, hollow guide column; 10, guide ring plate; 11, protruding block; 12, electric telescopic rod; 13, driven gear ring; 14, fixed rod; 15, hollow ring; 16, driving gear; 17, positioning assembly; 171, positioning sliding rod; 172, pressing column; 173, disc; 174, positioning spring; 18, guide frame; 19, moving ring; 20, moving support; 21, linkage telescopic rod; 22, transmission support; 23, cylindrical rod; 24, push rod; 25, sliding frame; 26, longitudinal sliding rod. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0037] Embodiment one: please refer to Figures 1-6The application provides the following technical scheme: a deep coal rock gas fracturing and permeability improvement device impacted by blasting gas, which comprises an air inlet pipe 1 for controlling hydrogen-oxygen gas delivery, a mixing tank 2 connected through the air inlet pipe 1, a combustion tank 3 fixedly connected to the mixing tank 2, a fire barrier 4 installed between the combustion tank 3 and the mixing tank 2 to prevent combustion backfire, and a igniter 5 fixedly installed in the combustion tank 3; a flow control valve 6 and a pressure sensor 7 are installed on the air inlet pipe 1 to control gas flow; an energy-gathering nozzle 8 is installed at an end of the combustion tank 3 away from the fire barrier 4, a hollow guide column 9 is installed outside the energy-gathering nozzle 8, a guide ring plate 10 is rotatably installed on the hollow guide column 9, and a steering mechanism is arranged on an end face of the combustion tank 3 to regulate the direction of high-temperature and high-pressure gas.

[0038] Please refer to Figures 3-7 The steering mechanism comprises a protrusion 11 fixedly installed on the guide ring plate 10; an electric telescopic rod 12 is rotatably connected to the hollow guide column 9, and an output end of the electric telescopic rod 12 is rotatably connected to the protrusion 11. A driven gear ring 13 is fixedly sleeved outside the hollow guide column 9; a fixed rod 14 is connected to an end face of the combustion tank 3, a hollow ring 15 is fixedly installed on the fixed rod 14, and the hollow ring 15 is coaxially sleeved outside the energy-gathering nozzle 8; a driving gear 16 is rotatably installed on the hollow ring 15, and the driving gear 16 is meshingly connected to the driven gear ring 13.

[0039] A blasting hole is formed in a deep coal rock gas reservoir, the combustion tank 3 is arranged in the blasting hole, hydrogen and oxygen gases are delivered into the mixing tank 2 through the two air inlet pipes 1, the state of the input gas in the air inlet pipe 1 is detected through the flow control valve 6 and the pressure sensor 7, the hydrogen-oxygen gas is accurately mixed in the mixing tank 2 according to the stoichiometric ratio of 2:1, the mixed gas enters the combustion tank 3, the igniter 5 triggers the hydrogen-oxygen mixed gas to burn, and the burned gas is sprayed outward through the energy-gathering nozzle 8 at the end of the combustion tank 3, under the guidance of the hollow guide column 9 and the guide ring plate 10, so that the high-temperature and high-pressure gas is sprayed on the reservoir, and the reservoir crack formation is more accurate.

[0040] According to the needs of deep coal bed methane reservoir blasting, the angle of the guide ring plate 10 corresponding to the end of the energy-gathering nozzle 8 is adjusted, the distance between the protrusion 11 and the hollow guide column 9 is adjusted by operating the electric telescopic rod 12, the guide ring plate 10 connected to the hollow guide column 9 is rotated, the direction of gas output is preliminarily adjusted, then the micro motor on the hollow ring 15 drives the driving gear 16 to rotate, the driving gear 16 drives the driven gear ring 13 to rotate through meshing transmission, the driven gear ring 13 is fixedly installed on the hollow guide column 9, and can drive the hollow guide column 9 and the guide ring plate 10 to rotate, the inclined position of the guide ring plate 10 inclined outside the energy-gathering nozzle 8 is regulated, and the direction of gas output is further adjusted.

[0041] And in the process of continuous gas injection, the guide ring plate 10 can be controlled to tilt and rotate outside the circumference of the shaped charge nozzle 8, so that the gas injection can uniformly act on the deep reservoir, avoid the repeated impact on a certain position in the reservoir to form a single direction super deep crack, and improve the uniformity of the crack formation after the reservoir blasting.

[0042] Embodiment two: please refer to Figures 8-10 and Figure 12 On the basis of embodiment one, the positioning assembly 17 is also disclosed, and the specific structure is as follows: a plurality of positioning assemblies 17 are arranged at equal angles along the axis direction on the hollow ring 15, and the positioning assembly 17 is pressed in the coal rock blasting hole to limit the installation position of the combustion tank 3. The positioning assembly 17 comprises a positioning sliding rod 171 slidingly connected in the hollow ring 15 along the radial direction, and a pressing column 172 is fixedly installed at the end of the positioning sliding rod 171 away from the shaped charge nozzle 8. A disc 173 is fixedly installed on the positioning sliding rod 171, and a positioning spring 174 is elastically connected between the disc 173 and the hollow ring 15.

[0043] Please refer to Figures 8-10 , the hollow ring 15 is provided with a transmission mechanism for adjusting and controlling the positioning pressing force of the positioning assembly 17. The transmission mechanism comprises a guide frame 18 fixedly installed on the hollow ring 15, and a moving ring 19 slidingly sleeved on the guide frame 18; the moving ring 19 is sleeved on the outside of the guide ring plate 10 along the axis direction, and the guide ring plate 10 rotates and contacts and extrudes the inner wall of the moving ring 19.

[0044] Please refer to Figures 8-11 , the moving ring 19 is fixedly connected with a moving support 20, and the moving support 20 is slidingly connected with the guide frame 18; the inner wall of the hollow ring 15 is fixedly connected with a linkage telescopic rod 21, the telescopic end of the linkage telescopic rod 21 is fixedly connected with a transmission support 22, the transmission support 22 is fixedly connected with a cylindrical rod 23, the cylindrical rod 23 is rotatably connected with a push rod 24, and the other end of the push rod 24 is rotatably connected with the moving support 20. The moving support 20 is fixedly installed with a sliding frame 25, the sliding frame 25 is slidingly connected with a longitudinal sliding rod 26, and the longitudinal sliding rod 26 is fixedly installed on the positioning sliding rod 171.

[0045] When the combustion tank 3 is arranged in the blasting hole, the pressing column 172 in the positioning assembly 17 contacts with the inner wall of the blasting hole, and is driven to move close to the shaped charge nozzle 8 by the extrusion of the blasting hole, and the positioning spring 174 is stretched under the elastic action of the positioning spring 174, so that the pressing column 172 is pressed on the inner wall of the blasting hole, thereby preliminarily limiting the arrangement position of the combustion tank 3.

[0046] When the angle of the regulating guide ring plate 10 connected on the hollow guide column 9 is regulated, the guide ring plate 10 rotates to contact and push the inner wall of the moving ring 19, the moving ring 19 is pressed to move close to the combustion pot 3, the moving ring 19 is sleeved on the guide frame 18 to move, and it drives the moving support 20 to penetrate the guide frame 18 to move in a direction, when the moving support 20 moves, the push rod 24 connected between the moving support 20 and the cylindrical rod 23 rotates at both ends, the rotating push rod 24 can control the synchronous movement of the transmission support 22, under the guidance of the linkage telescopic rod 21, the transmission support 22 moves close to the inner wall of the hollow ring 15, the sliding frame 25 fixed on the transmission support 22 moves synchronously, in the process of transverse movement of the sliding frame 25, the longitudinal sliding rod 26 is clamped in the sliding frame 25 to slide correspondingly, and the longitudinal sliding rod 26 drives the positioning sliding rod 171 connected on the side wall of the hollow ring 15 to move outward, the positioning sliding rod 171 drives the fixed end of the pressing column 172 to move and press in the blasting hole, further reinforcing the position of the combustion pot 3 arranged in the blasting hole, reducing the interference of the combustion pot 3 by gas fluctuation, and improving the accuracy of the high-temperature and high-pressure gas output direction.

[0047] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A deep coal rock gas fracturing and permeability improvement device of blasting gas impact, comprising a gas inlet pipe (1) for controlling hydrogen-oxygen gas delivery, characterized in that: The intake pipe (1) is provided with a mixing tank (2) connected thereto, the mixing tank (2) is fixedly connected with a combustion tank (3), a flame arrestor (4) is installed between the combustion tank (3) and the mixing tank (2) to prevent backfire, and a igniter (5) is fixedly installed in the combustion tank (3); The intake pipe (1) is provided with a flow control valve (6) and a pressure sensor (7) for controlling the flow of gas; The combustion tank (3) is provided with a shaped charge nozzle (8) at one end away from the flame arrestor (4), the shaped charge nozzle (8) is provided with a hollow guide column (9) outside, the hollow guide column (9) is rotatably provided with a guide ring plate (10), and the end surface of the combustion tank (3) is provided with a steering mechanism for adjusting the direction of the high-temperature and high-pressure gas in the hollow guide column (9).

2. The device according to claim 1, wherein the device is characterized in that: The steering mechanism comprises a protrusion (11) fixedly installed on the guide ring plate (10); The hollow guide column (9) is rotatably connected with an electric telescopic rod (12), and the output end of the electric telescopic rod (12) is rotatably connected with the protrusion (11).

3. The device according to claim 2, wherein the device is characterized in that: The hollow guide column (9) is externally fixedly provided with a driven gear ring (13); The end surface of the combustion tank (3) is connected with a fixed rod (14), the fixed rod (14) is fixedly provided with a hollow ring (15), and the hollow ring (15) is coaxially provided outside the shaped charge nozzle (8); The hollow ring (15) is rotatably provided with a driving gear (16), and the driving gear (16) is meshingly connected with the driven gear ring (13).

4. The device according to claim 3, wherein the device is characterized in that: A plurality of positioning assemblies (17) are provided on the hollow ring (15) at equal angles along the axial direction, and the positioning assemblies (17) are pressed in the coal rock blasting hole to limit the installation position of the combustion tank (3).

5. The device according to claim 4, wherein the device is characterized in that: The positioning assembly (17) comprises a positioning sliding rod (171) slidably connected in the hollow ring (15) along the radial direction, and a pressing column (172) is fixedly installed at one end of the positioning sliding rod (171) away from the shaped charge nozzle (8).

6. The device according to claim 5, wherein the device is characterized in that: A disc (173) is fixedly installed on the positioning sliding rod (171), and a positioning spring (174) is elastically connected between the disc (173) and the hollow ring (15).

7. The device according to claim 4, characterized in that: The hollow ring (15) is provided with a transmission mechanism for adjusting the pressing force of the positioning assembly (17).

8. The device according to claim 7, characterized in that: The transmission mechanism comprises a guide frame (18) fixedly installed on the hollow ring (15), and the guide frame (18) is slidably provided with a moving ring (19); The moving ring (19) is provided outside the guide ring plate (10) along the axial direction, and the guide ring plate (10) is rotatably in contact with the inner wall of the moving ring (19).

9. The device according to claim 8, wherein the device is characterized in that: The moving ring (19) is fixedly connected with a moving bracket (20), and the moving bracket (20) is slidably connected through the guide frame (18); The inner wall of the hollow ring (15) is fixedly connected with a linkage telescopic rod (21), the linkage telescopic rod (21) is fixedly connected with a transmission bracket (22) at the telescopic end, the transmission bracket (22) is fixedly connected with a cylindrical rod (23), the cylindrical rod (23) is rotatably connected with a push rod (24), and the other end of the push rod (24) is rotatably connected with the moving bracket (20).

10. The device according to claim 9, wherein the device is characterized in that: The mobile support (20) is fixedly provided with a sliding frame (25), the sliding frame (25) is slidably connected with a longitudinal sliding rod (26), and the longitudinal sliding rod (26) is fixedly installed on the positioning sliding rod (171).

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