Underground coal mine intelligent gas extraction device

Abstract

The utility model discloses an underground coal mine intelligent gas extraction device, which belongs to the technical field of gas extraction and comprises a bottom plate, a gas pump station is fixedly mounted at the top of the bottom plate, one end of the gas pump station is communicated with an exhaust pipe, and the other end of the gas pump station is communicated with a first connecting pipe. A gas-water separator is fixedly installed at the top of the bottom plate, and the output end of the gas-water separator is communicated with the other end of the first connecting pipe. The gas sensor is arranged to detect the gas concentration at the position of a coal mine wellhead, and then whether gas leaks or not is detected and judged; by arranging the guide rail and the linear motor, the camera can be driven to move up and down to detect the surface of the extraction pipe, and by arranging the hemispherical rail and the hemispherical groove, the camera can be driven to rotate while the camera moves up and down, so that the surface of the extraction pipe is detected more comprehensively, the damaged part of the extraction pipe is found, and subsequent maintenance and use are facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of gas extraction technology, and specifically provides an intelligent gas extraction device for underground coal mines. Background Technology

[0002] Methane gas, typically referring to natural gas released from coal mines, is primarily composed of methane (chemical formula CH4). It is a colorless, odorless, and flammable natural gas. Methane gas is produced in underground coal seams due to the biochemical decomposition of coal and is usually released into the mine during coal mining. Coal mine methane drainage involves drilling into the coal seam and methane accumulation areas, connecting the boreholes to dedicated pipelines, and using drainage equipment to extract the methane from the coal seam and goaf to the surface for utilization; or discharging it into the main return airflow. Methane drainage is not only an important measure to reduce methane emissions during mining, prevent methane exceedances and accumulation, and prevent methane explosions and coal and gas outbursts, but it can also be transformed from a hazard into a resource for development and utilization associated with coal mining.

[0003] According to Chinese Patent Publication No. CN215761770U, an intelligent underground gas safety extraction device for coal mines includes a base plate, a gas pump station, a gas-liquid separator, a water tank, a first suction pipe, a drying box, a second suction pipe, a filter box, and an extraction pipe. The gas pump station, gas-liquid separator, and water tank are located at the top of the base plate. The outlet of the gas-liquid separator is connected to the inlet of the gas pump station, and the outlet of the gas-liquid separator is connected to the water tank. The inlet of the gas-liquid separator is connected to the first suction pipe, and the inlet of the first suction pipe is connected to the drying box. The drying chamber has an air inlet connected to a second suction pipe, and the air inlet of the second suction pipe is connected to a filter box. This device facilitates the replacement of the filter layer and adsorption layer. The first and second sealing rings enhance the sealing performance of the air outlet and air inlet of the filter box, effectively preventing leakage during use. However, the aforementioned patent cannot detect the concentration of methane gas during use. When the extraction pipe is damaged, causing methane leakage, it cannot be detected, thus posing a safety hazard. Therefore, an intelligent underground methane extraction device for coal mines is proposed to solve the above-mentioned problems. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides an intelligent underground gas extraction device for coal mines.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: an intelligent underground gas extraction device for coal mines, comprising a base plate and a filtering mechanism, wherein the base plate is set on the ground, a gas pump station is fixedly installed on the top of the base plate, an exhaust pipe is provided at one end of the gas pump station, a first connecting pipe is provided at the other end of the gas pump station, a gas-water separator is fixedly installed on the top of the base plate, and the output end of the gas-water separator is connected to the first connecting pipe, a second connecting pipe is provided at the input end of the gas-water separator, and the outer end of the second connecting pipe is connected to the filtering mechanism;

[0006] The filtration mechanism includes a filter box, which is located at the wellhead. An air extraction pipe is installed at the bottom of the filter box, and a detection mechanism is installed on the filter box.

[0007] The detection mechanism includes a gas sensor, which is fixedly installed on the front of the filter box.

[0008] Furthermore, the filtration mechanism also includes a filter screen, a vibration motor, a slag discharge pipe, and a valve. The filter screen is fixedly installed on the inner wall of the filter box, the vibration motor is located on the inner wall of the filter box and acts on the filter screen, the slag discharge pipe is located at the bottom of the filter box, and the valve is located on the slag discharge pipe.

[0009] Furthermore, the bottom of the filter box is provided with a slope, and the lowest end of the slope is connected to the top of the slag discharge pipe.

[0010] Furthermore, the detection mechanism also includes a long plate, a guide rail, a linear motor, a disc, a connecting block, a fixing plate, and a camera. The long plate is fixedly connected to the bottom of the filter box. The guide rail is set on the surface of the long plate. The linear motor is moved and mounted on the guide rail. The disc is sleeved on the suction pipe. A circular groove is opened on the side of the disc, and the cross-sectional shape of the circular groove is arc-shaped. The connecting block is fixedly installed on the linear motor, and a ball is fixedly installed on the outer end of the connecting block and inserted into the circular groove. The fixing plate is fixedly installed on the bottom of the disc, and the camera is fixedly installed on the fixing plate.

[0011] Furthermore, the outer wall of the suction pipe is provided with a hemispherical track, and the hemispherical track is spirally wound around the suction pipe, and the inner wall of the disc is provided with a hemispherical groove that matches the hemispherical track.

[0012] Furthermore, a water tank is fixedly installed on the top of the base plate, and a drain pipe is provided at one end of the water tank, and the drain pipe is connected to the bottom of the gas-water separator.

[0013] Furthermore, an audible and visual alarm is installed on the back of the gas pump station, and the audible and visual alarm is electrically connected to the gas sensor.

[0014] Furthermore, a support rod is fixedly installed on the top of the base plate, and a horizontal plate is fixedly installed on the top of the support rod. There are four support rods, which are respectively installed at the four bottom corners of the horizontal plate, and the exhaust pipe passes through the middle of the horizontal plate.

[0015] Furthermore, a ventilation mechanism is provided at the top of the horizontal plate. The ventilation mechanism includes a rotating rod, a mounting plate, and a fan. The rotating rod is rotatably mounted on the top of the horizontal plate via a bearing. The mounting plate is fixedly connected to the top of the rotating rod, and the fan is mounted on the mounting plate.

[0016] Furthermore, the ventilation mechanism also includes a gear, side plates, a reciprocating screw, a motor, a moving block, and a rack. The gear is fixedly mounted on the outer wall of the rotating rod. The two side plates are fixedly mounted on the top of the horizontal plate. The motor is fixedly mounted on the top of the horizontal plate, and the reciprocating screw is fixedly mounted on the output end of the motor. The reciprocating screw is rotatably mounted between the two side plates via a bearing. The moving block is threaded onto the reciprocating screw. The moving block is cuboid in shape, and its lower end is attached to the top of the horizontal plate. The rack is fixedly mounted on the top of the moving block, and the rack meshes with the gear.

[0017] The beneficial effects of using this utility model are:

[0018] 1. This utility model can detect the gas concentration at the coal mine entrance by setting a gas sensor, thereby realizing the detection and judgment of whether a gas leak has occurred. By setting a guide rail and a linear motor, the camera can be moved up and down to detect the surface of the extraction pipe. By setting a hemispherical track and a hemispherical groove, the camera can be rotated while moving up and down, so as to more comprehensively detect the surface of the extraction pipe, find the damaged parts of the extraction pipe, and facilitate subsequent maintenance and use.

[0019] 2. This utility model can filter the extracted gas by setting a filter screen, intercepting impurities in the gas, reducing subsequent emission pollution, and achieving the purpose of environmental protection. By setting a vibration motor, the filter screen can be driven to vibrate, thereby shaking off the impurities intercepted by the filter screen and avoiding filter screen blockage. By setting a slag discharge pipe and valve, the impurities in the filter box can be discharged to avoid the accumulation of impurities.

[0020] 3. This utility model can disperse the gas discharged from the exhaust pipe by setting a fan, so as to avoid the impact of excessive gas concentration. By setting a reciprocating screw, motor, moving block, rack and gear, the fan can be driven to swing, so as to disperse the gas in different directions, thereby making the fan disperse more thoroughly and preventing the gas from accumulating in one direction. Attached Figure Description

[0021] Figure 1 This is one of the three-dimensional schematic diagrams of this utility model.

[0022] Figure 2 This is the second three-dimensional schematic diagram of the present invention.

[0023] Figure 3 This is the third perspective view of the present invention.

[0024] Figure 4 This is a schematic diagram of the internal structure of the filter box of this utility model.

[0025] Figure 5 This utility model Figure 2 A magnified view of part A in the middle.

[0026] Figure 6 This utility model Figure 2 A magnified view of part B in the middle section.

[0027] The attached reference numerals include: 1. Base plate; 2. Gas pump station; 3. Exhaust pipe; 4. First connecting pipe; 5. Gas-water separator; 6. Second connecting pipe; 7. Filtration mechanism; 701. Filter box; 702. Filter screen; 703. Vibration motor; 704. Slag discharge pipe; 705. Valve; 8. Detection mechanism; 801. Gas sensor; 802. Long plate; 803. Guide rail; 804. Linear motor; 805. Disc; 806. Circular groove; 807. Connecting block; 808. Fixing plate; 809. Camera; 810. Hemispherical track; 9. Ventilation mechanism; 901. Rotating rod; 902. Gear; 903. Side plate; 904. Reciprocating screw; 905. Motor; 906. Moving block; 907. Rack; 908. Mounting plate; 909. Fan; 10. Extraction pipe. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" means two or more, unless otherwise explicitly specified.

[0032] Example 1

[0033] Reference Figures 1 to 6 An intelligent underground gas extraction device for coal mines includes a base plate 1 and a filter mechanism 7. The base plate 1 is set on the ground. A gas pump station 2 is fixedly installed on the top of the base plate 1. An exhaust pipe 3 is provided at one end of the gas pump station 2, and a first connecting pipe 4 is provided at the other end of the gas pump station 2. A gas-water separator 5 is fixedly installed on the top of the base plate 1, and the output end of the gas-water separator 5 is connected to the first connecting pipe 4. A second connecting pipe 6 is provided at the input end of the gas-water separator 5, and the outer end of the second connecting pipe 6 is connected to the filter mechanism 7.

[0034] Gas pump station 2 provides the power for gas extraction.

[0035] The gas-water separator 5 is used to separate moisture from gas.

[0036] The filter unit 7 is used to filter solid impurities in the gas.

[0037] The filtration mechanism 7 includes a filter box 701, which is located at the wellhead. A suction pipe 10 is provided at the bottom of the filter box 701, and a detection mechanism 8 is provided on the filter box 701.

[0038] The detection mechanism 8 includes a gas sensor 801, which is fixedly installed on the front of the filter box 701.

[0039] The base plate 1 is set on the ground, the filter mechanism 7 is set at the wellhead, and the gas extraction pipe 10 extends into the well for gas extraction. Most of the gas flows into the filter box 701 through the gas extraction pipe 10, and a small part of the gas is discharged from the wellhead. The gas sensor 801 detects the concentration of the gas discharged from the wellhead.

[0040] In this embodiment, the exhaust pipe 3 is connected to the collection pipe for collecting the extracted gas.

[0041] Specifically, such as Figure 4 As shown, the filtration mechanism 7 also includes a filter screen 702, a vibration motor 703, a slag discharge pipe 704, and a valve 705. The filter screen 702 is fixedly installed on the inner wall of the filter box 701. The vibration motor 703 is located on the inner wall of the filter box 701 and acts on the filter screen 702. The slag discharge pipe 704 is located at the bottom of the filter box 701, and the valve 705 is located on the slag discharge pipe 704.

[0042] The operation of the vibration motor 703 will cause the filter screen 702 to vibrate, which can shake off the impurities attached to the filter screen 702 and ensure that the filter screen 702 is unobstructed.

[0043] Valve 705 is used to discharge the shaken-off impurities.

[0044] Specifically, such as Figure 4 As shown, the bottom of the filter box 701 is provided with a slope, and the lowest end of the slope is connected to the top of the slag discharge pipe 704.

[0045] Setting up a ramp allows impurities filtered from the gas to be accurately moved to the slag discharge pipe 704 and discharged from the filter box 701.

[0046] Specifically, such as Figure 5 As shown, the detection mechanism 8 also includes a long plate 802, a guide rail 803, a linear motor 804, a disc 805, a connecting block 807, a fixing plate 808, and a camera 809. The long plate 802 is fixedly connected to the bottom of the filter box 701. The guide rail 803 is set on the surface of the long plate 802. The linear motor 804 is movably mounted on the guide rail 803. The disc 805 is sleeved on the suction pipe 10. A circular groove 806 is opened on the side of the disc 805, and the cross-sectional shape of the circular groove 806 is arc-shaped. The connecting block 807 is fixedly installed on the linear motor 804, and a ball is fixedly installed on the outer end of the connecting block 807. The ball is inserted into the circular groove 806. The fixing plate 808 is fixedly installed on the bottom of the disc 805, and the camera 809 is fixedly installed on the fixing plate 808.

[0047] Specifically, such as Figure 5 As shown, the outer wall of the suction pipe 10 is provided with a hemispherical track 810, and the hemispherical track 810 is spirally wound around the suction pipe 10. The inner wall of the disc 805 is provided with a hemispherical groove that matches the hemispherical track 810.

[0048] When the linear motor 804 is running, it can move linearly along the guide rail 803, thereby driving the connecting block 807 and the disk 805 to move vertically. During this process, due to the effect of the spiral hemispherical track 810, the disk 805 and the camera 809 will rotate, so the camera 809 can inspect the surface of the suction pipe 10.

[0049] Specifically, such as Figure 1 As shown, a water tank is fixedly installed on the top of the base plate 1, and a drain pipe is provided at one end of the water tank, and the drain pipe is connected to the bottom of the air-water separator 5.

[0050] A water tank is provided to facilitate the collection of water separated by the air-water separator 5.

[0051] Specifically, an audible and visual alarm is installed on the back of the gas pump station 2, and the audible and visual alarm is electrically connected to the gas sensor 801.

[0052] Installing an audible and visual alarm can alert operators when the gas concentration is too high.

[0053] Working principle: The gas pump station 2 extracts gas from the coal mine. The gas enters the filter box 701 through the extraction pipe 10. The gas is filtered by the filter screen 702 in the filter box 701. The filtered gas enters the gas-water separator 5 through the second connecting pipe 6 for gas-water separation. Then the gas enters the gas pump station 2 through the first connecting pipe 4 and is collected through the exhaust pipe 3. The separated water flows into the water tank through the drain pipe for collection.

[0054] By starting the vibration motor 703, the filter screen 702 can be vibrated, thereby shaking off the impurities on the filter screen 702 and preventing the filter screen 702 from clogging. The impurities will fall into the slag discharge pipe 704 through the slope and accumulate. The impurities can be discharged from the filter box 701 by opening the valve 705.

[0055] The gas sensor 801 can detect the gas concentration at the mine entrance. When the gas concentration at the entrance exceeds the standard or suddenly increases, an audible and visual alarm will be triggered. At the same time, the linear motor 804 is activated. The linear motor 804 moves on the guide rail 803. Through the connecting block 807, the ball, and the circular groove 806, the linear motor 804 drives the disc 805 to move vertically. Simultaneously, under the action of the hemispherical track 810 and the hemispherical groove, the disc 805 rotates. This causes the disc 805 and the camera 809 to move and rotate vertically at the same time, allowing the camera 809 to detect the outer surface of the extraction pipe 10, locate the damaged location of the extraction pipe 10, and then stop the extraction device. After repairing the damaged location of the extraction pipe 10, the extraction device is restarted to extract gas.

[0056] Example 2

[0057] Based on Example 1, an auxiliary system for gas emission, namely ventilation mechanism 9, was set up.

[0058] In this embodiment, the exhaust pipe 3 is not connected to the collection pipe, but is used directly to discharge the gas directly. This is suitable for situations where the concentration of the extracted gas is lower than the standard, or other situations where gas needs to be discharged.

[0059] Specifically, such as Figure 1 As shown, a support rod is fixedly installed on the top of the base plate 1, and a horizontal plate is fixedly installed on the top of the support rod. There are four support rods, which are respectively installed at the four bottom corners of the horizontal plate. The exhaust pipe 3 passes through the middle of the horizontal plate.

[0060] Specifically, such as Figure 1 As shown, a ventilation mechanism 9 is provided at the top of the horizontal plate. The ventilation mechanism 9 includes a rotating rod 901, a mounting plate 908, and a fan 909. The rotating rod 901 is rotatably mounted on the top of the horizontal plate through a bearing. The mounting plate 908 is fixedly connected to the top of the rotating rod 901. The fan 909 is mounted on the mounting plate 908.

[0061] Specifically, such as Figure 6 As shown, the ventilation mechanism 9 also includes a gear 902, side plates 903, a reciprocating screw 904, a motor 905, a moving block 906, and a rack 907. The gear 902 is fixedly mounted on the outer wall of the rotating rod 901. The two side plates 903 are fixedly mounted on the top of the horizontal plate. The motor 905 is fixedly mounted on the top of the horizontal plate, and the reciprocating screw 904 is fixedly mounted on the output end of the motor 905. The reciprocating screw 904 is rotatably mounted between the two side plates 903 through a bearing. The moving block 906 is threaded onto the reciprocating screw 904. The moving block 906 is cuboid in shape, and its lower end is attached to the top of the horizontal plate. The rack 907 is fixedly mounted on the top of the moving block 906, and the rack 907 meshes with the gear 902.

[0062] The motor 905 drives the reciprocating screw 904 to periodically rotate in both directions. Through the cooperation of the rack 907 and the gear 902, the rotating rod 901, the mounting plate 908 and the fan 909 are rotated, thus achieving the effect of changing the direction of the wind.

[0063] Working principle: The extracted gas is discharged to the outside through the exhaust pipe 3, and at the same time the fan 909 is started to disperse the discharged gas.

[0064] Based on the above, the motor 905 is started to drive the reciprocating screw 904 to rotate, which in turn drives the moving block 906 to move back and forth. Through the transmission of the rack 907 and the gear 902, the rotating rod 901 will be driven to rotate back and forth, which in turn drives the fan 909 to swing back and forth, thereby realizing the multi-directional diffusion of gas and preventing the discharged gas from drifting in one direction, thus avoiding the safety hazard of excessive gas concentration in a certain place.

[0065] In addition, a control panel can be installed on the gas pump station 2 in Embodiment 1 and Embodiment 2. The control panel is used to control the operation of the relevant electrical equipment of the extraction device and display relevant data. The data and the operating status of each device can be obtained intuitively, which facilitates control.

[0066] The above content is only a preferred embodiment of this utility model. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of this utility model. As long as these changes do not depart from the concept of this utility model, they all fall within the protection scope of this utility model.

Claims

1. An intelligent underground gas extraction device for coal mines, characterized in that: The utility model provides a gas pump station, including bottom plate (1) and filter mechanism (7), and bottom plate (1) sets up on ground, the top fixed mounting of bottom plate (1) is provided with gas pump station (2), one end of gas pump station (2) is provided with exhaust pipe (3), the other end of gas pump station (2) is provided with first connecting pipe (4), the top fixed mounting of bottom plate (1) is provided with gas -water separator (5), and the output of gas -water separator (5) is in communication with first connecting pipe (4), and the input of gas -water separator (5) is provided with second connecting pipe (6), and the outer end of second connecting pipe (6) is in communication with filter mechanism (7); The filter mechanism (7) comprises a filter box (701), and the filter box (701) is arranged at the well mouth, and the bottom of the filter box (701) is provided with an air extraction pipe (10), and the filter box (701) is provided with a detection mechanism (8); The detection mechanism (8) comprises a gas sensor (801), and the gas sensor (801) is fixedly installed on the front face of the filter box (701).

2. The intelligent gas extraction device for underground coal mine according to claim 1, characterized in that: The filter mechanism (7) further comprises a filter screen (702), a vibration motor (703), a residue discharge pipe (704) and a valve (705), the filter screen (702) is fixedly installed on the inner wall of the filter box (701), the vibration motor (703) is arranged on the inner wall of the filter box (701), and the vibration motor (703) acts on the filter screen (702), the residue discharge pipe (704) is arranged at the bottom of the filter box (701), and the valve (705) is arranged on the residue discharge pipe (704).

3. The intelligent gas extraction device for underground coal mine according to claim 2, characterized in that: The bottom of the filter box (701) is provided with a slope, and the lowest end of the slope is in communication with the top of the residue discharge pipe (704).

4. The intelligent gas extraction device for underground coal mine according to claim 1, characterized in that: The detection mechanism (8) further comprises a long plate (802), a guide rail (803), a linear motor (804), a disc (805), a connecting block (807), a fixed plate (808) and a camera (809), the long plate (802) is fixedly connected at the bottom of the filter box (701), the guide rail (803) is arranged on the surface of the long plate (802), the linear motor (804) is movably arranged on the guide rail (803), the disc (805) is sleeved on the air extraction pipe (10), a circular groove (806) is formed in the side surface of the disc (805), and the cross section of the circular groove (806) is in the shape of an arc, the connecting block (807) is fixedly installed on the linear motor (804), a spherical body is fixedly installed at the outer end of the connecting block (807), the spherical body is inserted into the circular groove (806), the fixed plate (808) is fixedly installed at the bottom of the disc (805), and the camera (809) is fixedly installed on the fixed plate (808).

5. The intelligent gas extraction device for underground coal mine according to claim 4, characterized in that: A hemispherical track (810) is arranged on the outer wall of the air extraction pipe (10), and the hemispherical track (810) is spirally wound on the air extraction pipe (10), and a hemispherical groove is formed in the inner wall of the disc (805) and matched with the hemispherical track (810).

6. The intelligent gas extraction device for underground coal mine according to claim 1, characterized in that: The top of the bottom plate (1) is fixedly installed with a water tank, one end of the water tank is provided with a drain pipe, and the drain pipe is communicated with the bottom of the gas-water separator (5).

7. The intelligent gas extraction device for underground coal mine according to claim 1, characterized in that: The back of the gas pump station (2) is provided with an audible and visual alarm, and the audible and visual alarm is electrically connected with the gas sensor (801).

8. The intelligent gas extraction device for underground coal mine according to claim 1, characterized in that: The top of the bottom plate (1) is fixedly installed with a support rod, the top end of the support rod is fixedly installed with a horizontal plate, the number of the support rod is four, four support rods are installed at the bottom of the four corners of the horizontal plate respectively, and the exhaust pipe (3) penetrates through the middle part of the horizontal plate.

9. The intelligent gas extraction device for underground coal mine according to claim 8, characterized in that: The top of the horizontal plate is provided with a ventilation mechanism (9), the ventilation mechanism (9) comprises a rotating rod (901), a mounting plate (908) and a fan (909), the rotating rod (901) is rotatably assembled on the top of the horizontal plate through a bearing, the mounting plate (908) is fixedly connected to the top end of the rotating rod (901), and the fan (909) is assembled on the mounting plate (908).

10. The intelligent gas extraction device for underground coal mine according to claim 9, characterized in that: The ventilation mechanism (9) further comprises a gear (902), a side plate (903), a reciprocating screw rod (904), a motor (905), a moving block (906) and a rack (907), the gear (902) is fixedly assembled on the outer wall of the rotating rod (901), two side plates (903) are fixedly installed on the top of the horizontal plate, the motor (905) is fixedly installed on the top of the horizontal plate, the reciprocating screw rod (904) is fixedly installed on the output end of the motor (905), the reciprocating screw rod (904) is rotatably assembled between the two side plates (903) through a bearing, the moving block (906) is screwed on the reciprocating screw rod (904), the moving block (906) is in the shape of a cuboid, the lower end of the moving block (906) is attached to the top of the horizontal plate, the rack (907) is fixedly installed on the top of the moving block (906), and the rack (907) is engaged with the gear (902).

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