A mine drilling blowout preventer

Abstract

The present application relates to the technical field of coal mine drilling, and particularly discloses a mine drilling and boring blowout prevention device, which comprises a sleeve, one end of which is connected with a contact ring, and the other end is connected with a buffer cover, the buffer cover is provided with a gas extraction opening and a discharge opening; a sliding plate and a mounting plate, the sliding plate is movably arranged in the sleeve, the mounting plate is fixedly arranged at the connecting end of the sleeve and the buffer cover, the sliding plate and the mounting plate are connected through an elastic member, the sliding plate is provided with a guide pipe, the mounting plate is provided with a fixed pipe, the guide pipe and the fixed pipe are slidably connected, and the fixed pipe is provided with a rotating plate; the guide pipe is moved in the fixed pipe by the buffer plate, the elastic member is used for buffering the gas, the buffer cover is arranged to make the gas enter the large space of the buffer cover from the small space of the guide pipe, the flow rate of the gas is reduced, the impact on the equipment is reduced, and the stability of the equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of coal mine drilling technology, and in particular to a blowout prevention device for mine drilling. Background Technology

[0002] In mine drilling operations, the sudden overflow of high-pressure gas, water, coal slag and other media in the borehole is a major safety hazard. As the core protective equipment, the blowout preventer has long been constrained by the impact load problem at the moment of valve closure, which restricts the reliability of the equipment and the safety of operation.

[0003] When drilling into a coal seam containing gas, the gas will rapidly escape at an extremely high speed, impacting the drilling equipment. To prevent gas leakage, blowout preventers are usually installed. However, the gas will exert a strong impact on the blowout preventers, affecting the overall stability of the drilling equipment and easily causing gas leakage problems. Summary of the Invention

[0004] The main objective of this invention is to provide a blowout prevention device for mine drilling boreholes, which aims to solve existing technical problems.

[0005] To achieve the above objectives, the present invention provides a blowout prevention device for mine drilling boreholes, comprising: The sleeve is connected to a contact ring at one end and to a buffer cover at the other end. The buffer cover is provided with an extraction port and a discharge port. A sliding plate and a mounting plate are provided. The sliding plate is movably disposed inside the sleeve, and the mounting plate is fixedly disposed at the connection end between the sleeve and the buffer cover. The sliding plate and the mounting plate are connected by an elastic element. The sliding plate is provided with a guide tube, and the mounting plate is provided with a fixed tube. The guide tube and the fixed tube are slidably inserted into each other. A rotating plate is provided inside the fixed tube, and the rotating plate divides the interior of the fixed tube into two spaces. The sliding plate moves toward the mounting plate under external force, compressing the elastic element. The guide tube moves with the fixed tube, pushing the rotating plate to rotate, so that the guide tube communicates with the buffer cover.

[0006] The sliding plate moves toward the mounting plate under external force, compressing the elastic element. The guide tube moves with the fixed tube to push open the rotating plate, so that the guide tube communicates with the buffer cover.

[0007] Furthermore, the buffer cover is provided with circumferentially distributed support rods. One end of each support rod is hinged to the mounting plate, and the other end of each support rod is slidably connected to the inner wall of the buffer cover. A separation net is provided between each pair of adjacent support rods. The middle of each support rod is hinged to one end of a push rod, and the other end of the push rod is hinged to one end of a movable rod. The other end of the movable rod passes through the mounting plate and is fixedly connected to the sliding plate.

[0008] Furthermore, the buffer cover is provided with a ring connected to the mounting plate, and a striking rod is sleeved on the ring. The striking rod is movably connected to the ring through a torsion spring structure, and the striking rod is provided with evenly distributed arc-shaped protrusions. The striking rod is movably abutting against the lever, and the lever movably passes through the mounting plate and is fixedly connected to the sliding plate. The lever is provided with an integrally formed protrusion.

[0009] Furthermore, a crushing rod is provided inside the guide tube, and both ends of the crushing rod are installed by brackets. The end of the crushing rod near the contact ring is connected to a dial wheel. The dial wheel is located in the air chamber, and the air chamber has an air inlet and an air outlet. The air chamber is fixed inside the guide tube.

[0010] Furthermore, the striking rod is located inside the separation net, and when the separation net is extended to its maximum angle, it divides the buffer cover into two cavities, and the end of the striking rod abuts against the separation net.

[0011] Furthermore, the sleeve includes a first tube connected to the contact ring and a second tube connected to the buffer cover, the mounting plate includes a first plate connected to the first tube and a second plate connected to the second tube, a compression cylinder and a compression spring are provided between the first tube and the second tube, and the first tube and the second tube are connected by a locking structure, which is unlocked by an unlocking member provided on the movable rod.

[0012] Furthermore, the locking structure includes a locking rod connected to the second tube, the end of the locking rod having an elastic protrusion, and the first tube having a locking groove adapted to the elastic protrusion, the locking groove having an L-shaped structure; When the first tube and the second tube are joined together, the elastic protrusion is located in the locking groove and extends into the first tube.

[0013] Furthermore, the separation mesh is composed of multiple layers of filter mesh.

[0014] Furthermore, the end of the contact ring is provided with an annular sealing bladder.

[0015] Furthermore, the buffer cover is fixed to the base, the base is slidably mounted on the linear guide rail, and the linear guide rail is provided with a telescopic rod connected to the base.

[0016] The beneficial effects of this invention are reflected in: This invention uses a sliding plate to move the guide tube within a fixed tube, and works with an elastic element to buffer the gas. At the same time, the buffer cover allows the gas to enter the larger space of the buffer cover from the small space of the guide tube, reducing the gas flow rate, minimizing the impact on the equipment, and improving the stability of the equipment.

[0017] This invention, through the separate structure of the sleeve and the mounting plate, allows the sleeve and the mounting plate to separate after the first layer of buffer between the sliding plate and the elastic element is broken, thus extending the compression cylinder, rapidly expanding the gas flow space, further reducing the gas flow rate, and improving the buffering effect.

[0018] This invention features a retractable separation mesh inside a buffer cover. The sliding plate moves to extend and retract the separation mesh, which expands the space inside the buffer cover before gas separation during the gas outflow process, and also enables gas separation and filtration.

[0019] This invention incorporates a crushing rod inside the guide tube to crush coal slag lumps carried by the gas during its outflow, thereby preventing blockage of the gas outflow channel and ensuring efficient gas overflow. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the blowout prevention device for mine drilling boreholes according to the present invention; Figure 2 For the present invention Figure 1 Front sectional view of the structure; Figure 3 This is a schematic diagram of the internal structure of the buffer shield of the present invention; Figure 4 This is a schematic diagram showing the connection between the sliding plate, mounting plate, and separation mesh structure of the present invention; Figure 5 This is a schematic diagram of the mounting plate structure of the present invention; Figure 6 This is a schematic diagram of the connection between the sleeve and the mounting plate structure of the present invention; Figure 7 This is a schematic diagram of the crushing rod of the present invention installed inside the guide tube; Figure 8 This is a schematic diagram showing the structural distribution of the unlocking component and locking rod of the present invention; Figure 9 This is a schematic diagram of the rotating plate of the present invention installed inside the fixed tube.

[0021] Explanation of reference numerals in the attached figures: 100. Sleeve; 1001. First tube; 1002. Second tube; 1003. Compression cylinder; 1004. Compression spring; 1005. Locking rod; 1006. Elastic protrusion; 1007. Locking groove; 101. Contact ring; 102. Buffer cover; 1021. Extraction port; 1022. Discharge port; 1023. Base; 1024. Linear guide rail; 1025. Telescopic rod; 103. Annular sealing bladder; 200. Sliding plate; 201. Installation Plate; 2011, First Plate; 2012, Second Plate; 202, Elastic Component; 203, Guide Tube; 204, Fixed Tube; 205, Rotating Plate; 300, Support Rod; 301, Separation Net; 302, Push Rod; 303, Movable Rod; 3031, Unlocking Component; 304, Ring; 305, Striking Rod; 306, Toggle Rod; 400, Crushing Rod; 401, Support; 402, Dial Wheel; 403, Air Chamber; 404, Air Inlet; 405, Air Outlet. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1-9 The present invention provides a blowout prevention device for mine drilling boreholes, including a casing 100, one end of which is connected to a contact ring 101, and the other end of which is connected to a buffer cover 102. Specifically, the buffer cover has a hollow frustum-shaped structure and a through hole for the drill rod to pass through. The buffer cover 102 is provided with an extraction port 1021 and a discharge port 1022. The extraction port 1021 and the discharge port 1022 are connected to an external collection device.

[0024] The sliding plate 200 and the mounting plate 201 are specifically provided with through holes for the drill rod to pass through and vent holes for gas to pass through. The sliding plate 200 is movably disposed inside the sleeve 100, and the mounting plate 201 is fixedly disposed at the connection end between the sleeve 100 and the buffer cover 102. The sliding plate 200 and the mounting plate 201 are connected by an elastic element 202, which can be a spring.

[0025] The sliding plate 200 is provided with a guide tube 203, and the mounting plate 201 is provided with a fixing tube 204. The guide tube 203 and the fixing tube 204 are slidably inserted into each other. A rotating plate 205 is provided inside the fixing tube 204, dividing the interior of the fixing tube 204 into two spaces. Specifically, the rotating plate 205 is installed inside the fixing tube 204 via a rotating shaft and a torsion spring structure. That is, when the rotating plate 205 is in its initial state, as shown... Figure 9 As shown, when the guide tube 203 contacts the rotating plate 205, it can push the rotating plate 205 to rotate, thereby connecting the guide tube 203 with the buffer cover 102. When the guide tube 203 is reset, the rotating plate 205 is automatically reset under the action of the rotating shaft and the torsion spring structure.

[0026] When the sliding plate 200 is subjected to an external force, it moves toward the mounting plate 201, compressing the elastic element 202. The guide tube 203 moves toward the fixed tube 204, pushing the rotating plate 205 to rotate, so that the guide tube 203 is connected to the buffer cover 102.

[0027] In this embodiment, the contact ring 101 is attached to the surface of the coal seam to be drilled, and the drill rod passes through the middle of the device. As the drill rod penetrates deeper and reaches a location with methane gas, the methane gas enters the guide pipe 203 through the sliding plate 200 and pushes the guide pipe to move within the fixed pipe, thus slowing down the gas for the first time. This continues until the guide pipe 203 moves within the fixed pipe 204 and pushes open the rotating plate 205, connecting the guide pipe 203 to the buffer cover 102. The gas then enters the buffer cover 102 from the guide pipe 203, achieving a second slowdown, reducing the impact on the equipment and improving its stability.

[0028] In this embodiment, the buffer cover 102 is provided with circumferentially distributed support rods 300. One end of the support rod 300 is hinged to the mounting plate 201, and the other end of the support rod 300 is slidably connected to the inner wall of the buffer cover 102. The inner wall of the buffer cover 102 is provided with a sliding groove adapted to the end of the support rod 300. A separation net 301 is provided between each pair of adjacent support rods 300. The middle part of each support rod 300 is hinged to one end of the push rod 302, and the other end of the push rod 302 is hinged to one end of the movable rod 303. The other end of the movable rod 303 passes through the mounting plate 201 and is fixedly connected to the sliding plate 200.

[0029] In this embodiment, when the gas enters the guide pipe 203, it pushes the sliding plate 200 to move. The sliding plate 200 pushes the push rod 302 to move via the movable rod 303. The two ends of the push rod 302 rotate with the support rod 300 and the movable rod 303 respectively, pushing the support rod 300 to rotate away from the drill pipe. This causes the separation net 301 to gradually open, which can both expand the space inside the buffer cover 102 before the gas is separated during the gas outflow process and perform gas separation and filtration operations. In addition, the separation net 301 can be extended and retracted by the support rod 300, which can increase the resistance when the sliding plate 200 moves, and help to further reduce the gas flow rate and achieve a buffering effect.

[0030] In this embodiment, the buffer cover 102 is provided with a ring 304 connected to the mounting plate 201. A striking rod 305 is sleeved on the ring 304. The striking rod 305 is movably connected to the ring 304 through a torsion spring structure. The striking rod 305 is provided with evenly distributed arc-shaped protrusions. The striking rod 305 is movably abutted against the lever 306. The lever 306 movably passes through the mounting plate 201 and is fixedly connected to the sliding plate 200. The lever 306 is provided with an integrally formed protrusion.

[0031] In this embodiment, when the gas flow from the borehole stops, the sliding plate 200 resets under the action of the elastic element 202, driving the lever 306 to move and reset synchronously. During the reset process, the protrusions on the lever 306 contact the arc-shaped protrusions evenly distributed on the striking rod 305 in sequence, causing the striking rod 305 to rotate intermittently and reciprocate under the action of the torsion spring, thus realizing the vibration function of the striking rod 305. The vibrating striking rod 305 contacts the inner surface of the separation net 301, which can clean off the coal slag adhering to the separation net 301, making it easier to perform subsequent separation and filtration of gas, thus improving the reusability of the device.

[0032] In this embodiment, a crushing rod 400 is provided inside the guide tube 203, and a plurality of staggered blades are provided on the surface of the crushing rod 400. The two ends of the crushing rod 400 are mounted through brackets 401. Specifically, the two ends of the crushing rod 400 are rotatably connected to the brackets 401. The end of the crushing rod 400 near the contact ring 101 is connected to a dial wheel 402. The dial wheel 402 is located inside the air chamber 403. Specifically, the dial wheel 402 is provided with evenly distributed blades. An air inlet 404 and an air outlet 405 are provided on the air chamber 403, and the air chamber 403 is fixed inside the guide tube 203. Specifically, the air inlet 404 is inclined toward the blades of the dial wheel 402, and the air outlet 405 is connected to the guide tube 203.

[0033] In this embodiment, when the gas flows out of the borehole, part of it directly enters the guide pipe 203 and part enters the gas chamber 403, driving the dial wheel 402 to rotate, which in turn drives the crushing rod 400 to rotate. The blades on the crushing rod 400 crush the large volume of coal slag or soil that enters the guide pipe 203, avoiding the problem of blockage in the guide pipe 203 and ensuring efficient gas outflow.

[0034] In this embodiment, the striking rod 305 is located inside the separation net 301, and when the separation net 301 is extended to its maximum angle, it divides the buffer cover 102 into two cavities, and the end of the striking rod 305 abuts against the separation net 301.

[0035] In this embodiment, a retractable separation net 301 is installed inside the buffer cover 102. The sliding plate 200 moves to cause the separation net 301 to extend and retract. After the separation net 301 is extended, it divides the buffer cover 102 into two cavities. The gas flowing out from the guide tube 203 first passes through the inner space of the separation net 301, and then passes through the separation net 301 for separation and filtration. Finally, it is discharged outward for collection. This is used to expand the space of the gas inside the buffer cover 102 before separation during the gas outflow process, and it can also perform gas separation and filtration operations.

[0036] In this embodiment, the sleeve 100 includes a first tube 1001 connected to the contact ring 101 and a second tube 1002 connected to the buffer cover 102. The mounting plate 201 includes a first plate 2011 connected to the first tube 1001 and a second plate 2012 connected to the second tube 1002. A compression cylinder 1003 and a compression spring 1004 are provided between the first tube 1001 and the second tube 1002. Specifically, grooves are provided on the mating end faces of the first tube 1001 and the second tube 1002 to accommodate the compression cylinder 1003 and the compression spring 1004. The compression spring 1004 is located on the outside of the compression cylinder 1003. The compression cylinder 1003 can be made of a material used to make corrugated pipes.

[0037] The first tube 1001 and the second tube 1002 are connected by a locking structure, which is unlocked by an unlocking member 3031 provided on the movable rod 303.

[0038] In this embodiment, if the gas flow rate is high, it continuously pushes the sliding plate 200 to move, driving the unlocking part 3031 on the movable rod 303 to contact the locking structure. The locking mechanism releases the lock on the first tube 1001 and the second tube 1002, causing the first tube 1001 and the second tube 1002 to separate under the action of the compression spring 1004. During the separation process, the compression cylinder 1003 unfolds, increasing the space through which the gas passes. At this time, the second plate 2012 drives the separation net 301 to move synchronously, and the push rod 302 rotates accordingly, causing the separation net 301 to gradually retract. It should be noted that even if the compression cylinder 1003 is fully extended, the separation net 301 will not be fully retracted. The space corresponding to the separation net 301 when it is fully extended is the first space, the space corresponding to the separation net 301 when it is retracted after the compression cylinder 1003 is extended is the second space, and the space after the compression cylinder 1003 is extended is the third space. The first space needs to be less than the sum of the second and third spaces. That is, the gas enters the combined space of the compression cylinder 1003 and the buffer cover 102 from the small space of the guide pipe 203, which further reduces the gas flow rate and achieves the buffering effect.

[0039] In this embodiment, the locking structure includes a locking rod 1005 connected to the second tube 1002. The end of the locking rod 1005 has an elastic protrusion 1006. The first tube 1001 has a locking groove 1007 adapted to the elastic protrusion 1006. The locking groove 1007 has an L-shaped structure.

[0040] When the first tube 1001 and the second tube 1002 are joined together, the elastic protrusion 1006 is located in the locking groove 1007 and extends into the first tube 1001.

[0041] In this embodiment, when the first tube 1001 and the second tube 1002 are joined together, the locking rod 1005 partially extends into the locking groove 1007, and the elastic protrusion 1006 is also located in the locking groove 1007 and is in a state of extending into the first tube 1001. When the sliding plate 200 moves to its maximum stroke, the unlocking member 3031 on the movable rod 303 contacts the elastic protrusion 1006, pressing the elastic protrusion 1006 back into the locking groove 1007. Under the action of the compression spring 1004, the first tube 1001 and the second tube 1002 are separated. That is, the first tube 1001 remains fixed, and the second tube 1002 moves away from the first tube 1001, unfolding the compression cylinder 1003, further expanding the gas flow space, reducing the gas flow rate, and improving the buffering effect.

[0042] In this embodiment, the separation mesh 301 is composed of multiple layers of filter mesh. This configuration allows for preliminary filtration of the gas through multiple layers of filter mesh, reducing the intensity of subsequent reprocessing.

[0043] In this embodiment, an annular sealing bladder 103 is provided at the end of the contact ring 101. This configuration increases the sealing between the contact ring 101 and the surface of the coal seam to be drilled, preventing the leakage of gas and the resulting danger.

[0044] In this embodiment, the buffer cover 102 is fixed on the base 1023, the base 1023 is slidably mounted on the linear guide rail 1024, and the linear guide rail 1024 is provided with a telescopic rod 1025 connected to the base 1023.

[0045] In this embodiment, when the first tube 1001 and the second tube 1002 are separated, the second tube 1002 drives the buffer cover 102 to move synchronously, so that the buffer cover 102 moves along the linear guide rail 1024, ensuring the stability of the movement.

[0046] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0047] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A blowout prevention device for mine drilling boreholes, characterized in that... ,include: A sleeve (100) is connected to a contact ring (101) at one end and to a buffer cover (102) at the other end. The buffer cover (102) is provided with an extraction port (1021) and a discharge port (1022). A sliding plate (200) and a mounting plate (201) are provided. The sliding plate (200) is movably disposed inside the sleeve (100). The mounting plate (201) is fixedly disposed at the connection end between the sleeve (100) and the buffer cover (102). The sliding plate (200) and the mounting plate (201) are connected by an elastic element (202). The sliding plate (200) is provided with a guide tube (203). The mounting plate (201) is provided with a fixed tube (204). The guide tube (203) and the fixed tube (204) are slidably inserted and engaged. The fixed tube (204) is provided with a rotating plate (205). The rotating plate (205) divides the interior of the fixed tube (204) into two spaces. The sliding plate (200) is moved toward the mounting plate (201) by an external force, compressing the elastic element (202). The guide tube (203) moves with the fixed tube (204) to push the rotating plate (205) to rotate, so that the guide tube (203) is connected to the buffer cover (102).

2. The blowout prevention device for mine drilling boreholes as described in claim 1, characterized in that: The buffer cover (102) is provided with circumferentially distributed support rods (300). One end of the support rod (300) is hinged to the mounting plate (201), and the other end of the support rod (300) is slidably connected to the inner wall of the buffer cover (102). A separation net (301) is provided between each pair of adjacent support rods (300). The middle part of each support rod (300) is hinged to one end of the push rod (302), and the other end of the push rod (302) is hinged to one end of the movable rod (303). The other end of the movable rod (303) passes through the mounting plate (201) and is fixedly connected to the sliding plate (200).

3. The blowout prevention device for mine drilling boreholes as described in claim 2, characterized in that: The buffer cover (102) is provided with a ring (304) connected to the mounting plate (201). A striking rod (305) is sleeved on the ring (304). The striking rod (305) is movably connected to the ring (304) through a torsion spring structure. The striking rod (305) is provided with evenly distributed arc-shaped protrusions. The striking rod (305) is movably abutted against the lever (306). The lever (306) movably passes through the mounting plate (201) and is fixedly connected to the sliding plate (200). The lever (306) is provided with an integrally formed protrusion.

4. The blowout prevention device for mine drilling boreholes as described in claim 1, characterized in that: The guide tube (203) is provided with a crushing rod (400). The two ends of the crushing rod (400) are installed by brackets (401). The end of the crushing rod (400) near the contact ring (101) is connected to the dial wheel (402). The dial wheel (402) is located in the air chamber (403). The air chamber (403) is provided with an air inlet (404) and an air outlet (405). The air chamber (403) is fixed in the guide tube (203).

5. A blowout prevention device for mine drilling boreholes as described in claim 3, characterized in that: The striking rod (305) is located inside the separating net (301), and when the separating net (301) is extended to its maximum angle, it divides the buffer cover (102) into two cavities, and the end of the striking rod (305) abuts against the separating net (301).

6. A blowout prevention device for mine drilling boreholes as described in claim 2, characterized in that: The sleeve (100) includes a first tube (1001) connected to the contact ring (101) and a second tube (1002) connected to the buffer cover (102). The mounting plate (201) includes a first plate (2011) connected to the first tube (1001) and a second plate (2012) connected to the second tube (1002). A compression cylinder (1003) and a compression spring (1004) are provided between the first tube (1001) and the second tube (1002). The first tube (1001) and the second tube (1002) are connected by a locking structure. The locking structure is unlocked by an unlocking member (3031) provided on the movable rod (303).

7. A blowout prevention device for mine drilling boreholes as described in claim 6, characterized in that: The locking structure includes a locking rod (1005) connected to the second tube (1002), the end of the locking rod (1005) having an elastic protrusion (1006), and the first tube (1001) having a locking groove (1007) adapted to the elastic protrusion (1006), the locking groove (1007) having an L-shaped structure; When the first tube (1001) and the second tube (1002) are joined together, the elastic protrusion (1006) is located in the locking groove (1007) and extends into the first tube (1001).

8. A blowout prevention device for mine drilling boreholes as described in claim 2, characterized in that: The separation mesh (301) is composed of multiple layers of filter mesh.

9. A blowout prevention device for mine drilling boreholes as described in claim 1, characterized in that: The end of the contact ring (101) is provided with an annular sealing bladder (103).

10. A blowout prevention device for mine drilling boreholes as described in claim 1, characterized in that: The buffer cover (102) is fixed on the base (1023), the base (1023) is slidably mounted on the linear guide rail (1024), and the linear guide rail (1024) is provided with a telescopic rod (1025) connected to the base (1023).

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