Gas extraction pump truck

Abstract

The present invention relates to the technical field of coal mine gas extraction, and in particular to a gas extraction pump truck, including a wet vacuum pump, a suction port, an air pipe, a sealing block, a sliding hole, an outer ring groove, and a sealing bag. The wet vacuum pump is fixedly connected in the carrying box, the suction port is fixedly connected to the top wall of the wet vacuum pump, and the air pipe is movably connected to the suction port. The sealing block is cylindrical, and a sliding hole is coaxially provided on the sealing block. The sealing block is slidably connected to the air pipe, and the air pipe is located in the sliding hole. An annular outer ring groove is provided on the outer periphery of the sealing block, and a plurality of annular sealing bags are fixedly connected at equal intervals in the outer ring groove. The prior art solves the problem that the coal mine pipeline is lengthened, new equipment needs to be added to increase the extraction power, and more personnel and funds need to be invested for maintenance and overhaul. At the same time, the surface of the borehole wall is not smooth, which is easy to scratch the sealing air bag on the outer periphery of the extraction pipe, thereby improving the sealing safety and efficiency of the gas extraction device.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine gas extraction, and in particular to a gas extraction pump truck. Background Art

[0002] A large amount of gas is produced during coal mining. Before mining, the gas in the mine needs to be extracted. During the extraction, the coal seam needs to be drilled. However, when the drilling sealing effect is not good, the gas is easy to leak from the gap between the hole wall and the extraction pipe, leading to related production accidents. Therefore, improving the sealing quality and enhancing the gas extraction effect are problems that need to be solved urgently and are also important guarantees for mine safety production.

[0003] In order to solve the above problems, a coal mine gas extraction device is proposed in a Chinese patent with announcement number CN112127940B. Grouting is injected into the annular airbag through a grouting pipe to expand the plugging airbag and the sealing airbag of the annular airbag. The outer wall of the plugging airbag is in close contact with the hole wall of the borehole to achieve a plugging effect. The inner wall of the sealing airbag is in close contact with the outer wall of the extraction pipe to achieve a sealing effect, thereby plugging the borehole. After the borehole is plugged, the gas pump station is controlled to start, and the gas generated by the operation of the gas pump station Negative pressure extracts gas from the mine. The gas passes through the filter on the extraction pipe, and the filter layer in the filter is used to filter out the dust in the gas. The adsorption layer in the filter is used to adsorb the harmful substances in the gas. After the gas enters the gas-liquid separator, the gas-liquid separator separates the water vapor inside the gas. The separated liquid enters the water tank, and the separated gas enters the gas pumping station. The gas pumping station then sends the separated gas into the gas collecting box, controls the gas pumping station to stop running, and completes the extraction of the gas.

[0004] The disadvantages are: with the continuous laying of underground pipelines, the pipelines are lengthened, the required extraction power increases, new equipment needs to be continuously added, and more personnel and funds need to be invested in maintenance and inspection. At the same time, the surface of the borehole wall is not smooth, and it is very easy to puncture or scratch the sealing air bag on the outer periphery of the extraction pipe, which reduces the sealing of the gas extraction device and reduces the safety and efficiency of the gas extraction device. Summary of the invention

[0005] The embodiment of the present application provides a gas extraction pump truck, which solves the problem in the comparative document that the pipeline needs to be lengthened, new equipment needs to be added to increase the extraction power, and more personnel and funds need to be invested in maintenance and repair. At the same time, the surface of the borehole wall is not smooth, which is easy to scratch the sealing airbag on the periphery of the extraction pipe, thereby improving the sealing safety and efficiency of the gas extraction device.

[0006] The embodiment of the present application provides a gas extraction pump truck, including a transfer device and an extraction device;

[0007] The transfer device comprises a vehicle body, a retractable chassis and a carrying box;

[0008] The vehicle body is movably connected to the retractable chassis, and the top wall of the retractable chassis is fixedly connected to the carrying box;

[0009] The carrying box is fixedly connected with a pumping device;

[0010] The extraction device comprises a wet vacuum pump, a suction port, an air pipe, a sealing block, a sliding hole, an outer ring groove, a sealing bag, an inner ring groove and a blocking bag;

[0011] The carrying box is fixedly connected to a wet vacuum pump, the top wall of the wet vacuum pump is fixedly connected to a suction port, and the suction port is movably connected to an air pipe;

[0012] The sealing block is cylindrical in shape, and a sliding hole is coaxially provided on the sealing block;

[0013] The sealing block is slidably connected to the trachea, and the trachea is located in the sliding hole;

[0014] The outer circumference of the sealing block is provided with an annular outer ring groove, and a plurality of annular sealing capsules are fixedly connected in the outer ring groove at equal intervals;

[0015] The inner wall of the sealing block is provided with an annular inner ring groove, and a sealing bag is arranged in the inner ring groove.

[0016] Furthermore, the extraction device also includes a connecting pipe, a connecting pipe and a grouting pipe;

[0017] The sealing block is penetrated by a cylindrical connecting pipe, which passes through the outer ring groove and is connected with a plurality of sealing bags, and the connecting pipe is connected with each sealing bag through a one-way valve;

[0018] The sealing block is fixedly connected with a connecting pipe, and both ends of the connecting pipe are respectively connected with the sealing bag and the blocking bag;

[0019] The top wall of the sealing block is fixedly connected to a grouting pipe, and the grouting pipe is communicated with the connecting pipe.

[0020] Furthermore, the transfer device further includes a first placement area, a second placement area, a third placement area and a fourth placement area;

[0021] The carrying box is divided into a first placement area, a second placement area, a third placement area and a fourth placement area at equal distances;

[0022] A wet vacuum pump is fixedly connected in the second placement area.

[0023] Furthermore, a gas collection tank group is provided in the first placement area, and the gas collection tank group is connected to a wet vacuum pump;

[0024] The side wall of the carrying box is provided with a sewage outlet and a water inlet, and both the sewage outlet and the water inlet are connected to the gas collection tank group.

[0025] Furthermore, a power device group is arranged in the third placement area;

[0026] The power unit group includes an engine, a generator and a coupling;

[0027] The engine and the generator are symmetrically fixedly connected in the third placement area, and the engine and the generator are electrically connected;

[0028] The generator motor shaft is fixedly connected to a coupling, and the other end of the coupling is fixedly connected to the shaft of a wet vacuum pump.

[0029] Furthermore, a control device group is provided in the fourth placement area;

[0030] The control device includes a control box, a power box, a frequency conversion box and an operating table;

[0031] The fourth placement area is equipped with a control box, a power box and a frequency conversion box in sequence, and the three are electrically connected;

[0032] An operating table is fixedly installed in the fourth placement area.

[0033] Furthermore, one end of the air pipe away from the suction port is fixedly connected to the drilling device;

[0034] The drilling device comprises a drill bit, a suction hole and a filter membrane;

[0035] One end of the air pipe away from the suction port is fixedly connected to the drill bit, and a plurality of suction holes are evenly spaced on the outer wall of the drill bit;

[0036] A filter membrane is fixedly connected to the outer periphery of the trachea, and a plurality of small holes are provided in the filter membrane.

[0037] Furthermore, one end of the grouting pipe away from the sealing block is fixedly connected to a grouting pump.

[0038] Furthermore, the extraction device also includes an elastic metal layer;

[0039] The outer periphery of each sealing bag is fixedly connected with an annular elastic metal layer.

[0040] Furthermore, the extraction device also includes a deformable airbag;

[0041] Each of the elastic metal layers is provided with a plurality of cavities at equal intervals, and each cavity is fixedly connected with a deformation airbag;

[0042] The multiple deformable airbags in each of the elastic metal layers are communicated with the sealing bag connected to the elastic metal layer.

[0043] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0044] Firstly, by changing the original single sealing bag into multiple independent annular sealing bags, the use stability and safety of the extraction device are improved, and the risk of the sealing bag being punctured or scratched by sharp objects on the inner wall of the borehole when the grouting pump is injecting grout into the sealing bag is effectively avoided. Even if a sealing bag is accidentally damaged, other independent sealing bags can still expand normally and fit tightly to the inner wall of the borehole, ensuring the effective sealing of the borehole by the extraction device and enhancing the reliability and working efficiency of the extraction device.

[0045] Secondly, in the process of the grouting pump injecting grout into the sealing bag to make it expand, the elastic metal layer can provide additional protection for the sealing bag and effectively prevent the sealing bag from being scratched by sharp objects on the inner wall of the borehole. Secondly, when the sealing bag expands, the sealing bag will push the elastic metal layer to deform, so that the elastic metal layer fits tightly against the convex or concave surface of the outer wall of the borehole. This feature enables the elastic metal layer to form a stable supporting surface with the convex or concave surface of the outer wall of the borehole when the trachea slides down the borehole and rubs against the sealing bag, effectively preventing the sealing block from shifting and creating a gap between it and the borehole, which not only significantly improves the service life of the sealing bag, but also enhances the sealing and overall working stability of the extraction device.

[0046] Thirdly, a plurality of cavities are opened at equal intervals in the elastic metal layer, thereby reducing the structural rigidity of the elastic metal layer; and a deformable airbag is fixedly connected in each cavity, and the deformable airbag is connected to the sealing bag. When the grouting pump expands when grouting into the sealing bag, the slurry in the sealing bag will enter the deformable airbag, thereby better pushing the elastic metal layer to deform and fit the convex or concave surface of the outer wall of the borehole, which not only enhances the sealing effect of the extraction device, but also improves its adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a structural schematic diagram of a gas extraction pump truck proposed by the present invention;

[0048] Figure 2 A side view of a gas extraction pump truck proposed by the present invention;

[0049] Figure 3 A top view of a gas extraction pump truck proposed by the present invention;

[0050] Figure 4 This is a schematic diagram of the structure of the extraction device proposed by the present invention;

[0051] Figure 5 A structural cross-sectional view of the sealing block proposed by the present invention;

[0052] Figure 6 A top sectional view of the sealing ring in the second embodiment of the present invention;

[0053] Figure 7 This is a top sectional view of the sealing ring in the third embodiment of the present invention.

[0054] In the figure: 100, transfer device; 110, vehicle body; 120, retractable chassis; 130, carrying box; 140, sewage outlet; 150, water inlet; 160, first placement area; 170, second placement area; 180, third placement area; 190, fourth placement area; 200, extraction device; 210, wet vacuum pump; 220, suction port; 230, air pipe; 240, sealing block; 250, sliding hole; 260, outer ring groove; 270, sealing capsule; 280, inner ring groove; 290, sealing Blocking bag; 211, connecting pipe; 212, connecting pipe; 213, grouting pipe; 214, elastic metal layer; 215, deformable airbag; 300, gas collection tank group; 400, power device group; 410, engine; 420, generator; 430, coupling; 500, control device group; 510, control box; 520, power box; 530, frequency conversion box; 540, operating table; 600, drilling device; 610, drill bit; 620, suction hole; 630, filter membrane; 700, grouting pump. DETAILED DESCRIPTION

[0055] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0056] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0058] Embodiment 1

[0059] like Figure 1-Figure 5 As shown, a gas extraction pump truck proposed in the present application includes a transfer device 100 and an extraction device 200;

[0060] The transfer device 100 includes a vehicle body 110 , a retractable chassis 120 , and a carrying box 130 ;

[0061] The vehicle body 110 is movably connected to the retractable chassis 120, and the top wall of the retractable chassis 120 is fixedly connected to the carrying box 130;

[0062] The carrying box 130 is fixedly connected to the extraction device 200;

[0063] The extraction device 200 includes a wet vacuum pump 210, a suction port 220, an air pipe 230, a sealing block 240, a sliding hole 250, an outer ring groove 260, a sealing bag 270, an inner ring groove 280, and a blocking bag 280;

[0064] The carrying box 130 is fixedly connected to a wet vacuum pump 210, the top wall of the wet vacuum pump 210 is fixedly connected to a suction port 220, and the suction port 220 is movably connected to an air pipe 230;

[0065] The sealing block 240 is cylindrical, and a sliding hole 250 is coaxially formed in the sealing block 240;

[0066] The sealing block 240 is slidably connected to the air pipe 230, and the air pipe 230 is located in the sliding hole 250;

[0067] The outer circumference of the sealing block 240 is provided with an annular outer ring groove 260, and a plurality of annular sealing capsules 270 are fixedly connected in the outer ring groove 260 at equal intervals;

[0068] The inner wall of the sealing block 240 is provided with an annular inner groove 280 , and a sealing bag 280 is arranged in the inner groove 280 .

[0069] Furthermore, the extraction device 200 also includes a connecting pipe 211, a connecting pipe 212, and a grouting pipe 213;

[0070] The sealing block 230 is penetrated by a cylindrical connecting pipe 212, which passes through the outer ring groove 260 and is connected to a plurality of sealing bags 270. The connecting pipe 212 is connected to each sealing bag 270 through a one-way valve.

[0071] The sealing block 230 is fixedly connected to the connecting pipe 212, and both ends of the connecting pipe 212 are respectively connected to the sealing bag 270 and the blocking bag 280;

[0072] The top wall of the sealing block 230 is fixedly connected to the grouting pipe 213 , and the grouting pipe 213 is in communication with the connecting pipe 211 .

[0073] Furthermore, the transfer device 100 further includes a first placement area 160 , a second placement area 170 , a third placement area 180 , and a fourth placement area 190 ;

[0074] The carrying box 130 is equally divided into a first placement area 160, a second placement area 170, a third placement area 180, and a fourth placement area 190;

[0075] A wet vacuum pump 200 is fixedly connected to the second placement area 170 .

[0076] Furthermore, a gas collection tank group 300 is provided in the first placement area 160, and the gas collection tank group 300 is connected to the wet vacuum pump 200;

[0077] The side wall of the carrying box 130 is provided with a sewage outlet 140 and a water inlet 150 , and both the sewage outlet 140 and the water inlet 150 are connected to the gas collection tank assembly 300 .

[0078] Furthermore, a power device group 400 is disposed in the third placement area 180;

[0079] The power device group 400 includes an engine 410, a generator 420, and a coupling 430;

[0080] The engine 410 and the generator 420 are symmetrically fixedly connected in the third placement area 180, and the engine 410 and the generator 420 are electrically connected;

[0081] The motor shaft of the generator 420 is fixedly connected to the coupling 430 , and the other end of the coupling 430 is fixedly connected to the shaft of the wet vacuum pump 200 .

[0082] Furthermore, a control device group 500 is provided in the fourth placement area 190;

[0083] The control device 500 includes a control box 510, a power box 520, a frequency conversion box 530 and an operating table 540;

[0084] The fourth placement area 190 is sequentially installed with a control box 510, a power box 520, and a frequency conversion box 530, which are electrically connected;

[0085] An operating table 540 is fixedly installed in the fourth placement area 190 .

[0086] Furthermore, one end of the air pipe 230 away from the suction port 220 is fixedly connected to the drilling device 600;

[0087] The drilling device 600 includes a drill bit 610, a suction hole 620, and a filter membrane 630;

[0088] One end of the air pipe 230 away from the suction port 220 is fixedly connected to the drill bit 610, and a plurality of suction holes 620 are evenly spaced on the outer wall of the drill bit 610;

[0089] A filter membrane 630 is fixedly connected to the outer periphery of the air pipe 230 , and the filter membrane 630 is provided with a plurality of small holes.

[0090] Furthermore, one end of the grouting pipe 213 away from the sealing block 240 is fixedly connected to the grouting pump 700 .

[0091] Specific implementation: The entire device is transported to the designated extraction location through the transfer device 100, and then the air pipe 230 is fixedly connected to the suction pipe 220, and then the drill bit 610 is placed in the borehole, and then the grouting pump 700 injects grout into the multiple sealing bags 270 through the grouting pipe 213 and the connecting pipe 212. The multiple sealing bags 270 that enter the slurry will expand and fit the inner wall of the borehole to avoid gas leakage in the well. At the same time, the sealing bags 270 and the plugging bags 290 are connected to each other through the connecting pipe 211, and the slurry will enter the plugging bags 290 through the connecting pipe 211 and expand the plugging bags 290. The air pipe 230 is expanded and fitted, which further improves the sealing of the extraction device 200; when the sealing work of the extraction device 200 is completed, the engine 410 is controlled by the control device group 500, and the working engine 410 drives the generator 420 to work and enables the wet vacuum pump 210 to start working. The working wet vacuum pump 210 will extract the gas in the well through the suction hole 620 on the periphery of the drill bit 610, and the extracted gas enters the gas collection pipe group 300 through the air pipe 230, and the water vapor together with the gas will be processed by the gas collection pipe group 300 and discharged from the sewage outlet 140.

[0092] Beneficial effect: By changing the original single sealing bag 270 into multiple independent annular sealing bags 270, the use stability and safety of the extraction device 200 are improved, and the risk of the sealing bag 270 being punctured or scratched by sharp objects that may exist on the inner wall of the borehole when the grouting pump 700 is grouting into the sealing bag 270 is effectively avoided. Even if a sealing bag 270 is accidentally damaged, other independent sealing bags 270 can still expand normally and fit tightly to the inner wall of the borehole, ensuring the effective sealing of the borehole by the extraction device 200 and enhancing the reliability and working efficiency of the extraction device 200.

[0093] Embodiment 2

[0094] As the mining depth of coal mines continues to increase, the drill bit 610 and the air pipe 230 need to continue to dig downward in the borehole. However, in this process, the sliding air pipe 230, the expanded sealing bag 290 and the inner wall of the sealing block 240 rub against each other, thereby causing the sealing block 240 as a whole and the sealing bag 270 to rub against the inner wall of the borehole. This friction may not only cause the sealing block 240 to shift, resulting in a gap between the seal block 240 and the borehole, but also wear the sealing bag 270, thereby reducing the sealing and service life of the extraction device 200. In order to solve this problem, Example 2 makes important improvements to Example 1.

[0095] like Figure 6 As shown, the extraction device 200 further includes an elastic metal layer 214;

[0096] The outer periphery of each sealing bag 270 is fixedly connected to the annular elastic metal layer 214 .

[0097] During the process of the grouting pump 700 injecting grout into the sealing bag 270 to make it expand, the elastic metal layer 214 can provide additional protection for the sealing bag 270, effectively preventing the sealing bag 270 from being scratched by sharp objects on the inner wall of the borehole. Secondly, when the sealing bag 270 expands, the sealing bag 270 will push the elastic metal layer 214 to deform, so that the elastic metal layer 214 fits tightly against the raised or concave surface of the outer wall of the borehole. This feature enables the elastic metal layer 214 to form a stable supporting surface with the raised or concave surface of the outer wall of the borehole when the trachea 230 slides down the borehole and generates friction with the sealing bag 290, effectively preventing the sealing block 240 from shifting and generating a gap between the sealing block 240 and the borehole, which not only significantly improves the service life of the sealing bag 270, but also enhances the sealing and overall working stability of the extraction device 200.

[0098] Embodiment 3

[0099] In order to further enhance the deformation and fit ability of the elastic metal layer 214 fixedly connected to the outer periphery of the sealing bag 270 and the convex or concave surface of the outer wall of the drilling hole, the third embodiment makes further improvements on the second embodiment.

[0100] like Figure 7 As shown, the extraction device 200 further includes a deformable airbag 215;

[0101] Each of the elastic metal layers 214 has a plurality of cavities formed therein at equal intervals, and each cavity is fixedly connected to a deformation airbag 215;

[0102] The multiple deformation airbags 215 in each of the elastic metal layers 214 are communicated with the sealing bag 270 connected to the elastic metal layer 214 .

[0103] By opening a plurality of cavities at equal intervals in the elastic metal layer 214, the structural rigidity of the elastic metal layer 214 is reduced; and a deformable airbag 215 is fixedly connected in each cavity, and the deformable airbag 215 is connected to the sealing bag 270. When the grouting pump 700 expands when grouting into the sealing bag 270, the slurry in the sealing bag 270 will enter the deformable airbag 215, thereby better pushing the elastic metal layer 214 to deform and fit the convex or concave surface of the outer wall of the borehole, which not only enhances the sealing effect of the extraction device 200, but also improves its adaptability.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas extraction pump truck, comprising a transfer device (100) and an extraction device (200); The transfer device (100) comprises a vehicle body (110), a retractable chassis (120) and a carrying box (130); The vehicle body (110) is movably connected to the retractable chassis (120), and the top wall of the retractable chassis (120) is fixedly connected to the carrying box (130); The carrying box (130) is fixedly connected to a pumping device (200); It is characterized in that The extraction device (200) comprises a wet vacuum pump (210), a suction port (220), an air pipe (230), a sealing block (240), a sliding hole (250), an outer ring groove (260), a sealing bag (270), an inner ring groove (280) and a blocking bag (290); The carrying box (130) is fixedly connected to a wet vacuum pump (210), the top wall of the wet vacuum pump (210) is fixedly connected to a suction port (220), and the suction port (220) is movably connected to an air pipe (230); The sealing block (240) is cylindrical, and a sliding hole (250) is coaxially provided on the sealing block (240); The sealing block (240) is slidably connected to the air pipe (230), and the air pipe (230) is located in the sliding hole (250); An annular outer ring groove (260) is provided on the outer circumference of the sealing block (240), and a plurality of annular sealing capsules (270) are fixedly connected at equal intervals in the outer ring groove (260); The inner wall of the sealing block (240) is provided with an annular inner groove (280), and a blocking bag (290) is arranged in the inner groove (280); the extraction device (200) further comprises an elastic metal layer (214); The outer periphery of each sealing bag (270) is fixedly connected to an annular elastic metal layer (214); The extraction device (200) further comprises a deformable airbag (215); A plurality of cavities are equidistantly provided in each of the elastic metal layers (214), and a deformable airbag (215) is fixedly connected to each cavity; The multiple deformable airbags (215) in each of the elastic metal layers (214) are in communication with a sealing bag (270) connected to the elastic metal layer (214).

2. A gas extraction pump truck according to claim 1, characterized in that: The extraction device (200) further comprises a connecting pipe (211), a connecting pipe (212) and a grouting pipe (213); The sealing block (240) is penetrated by a cylindrical connecting pipe (212), the connecting pipe (212) penetrates the outer ring groove (260) and is connected to a plurality of sealing bags (270), and the connecting pipe (212) is connected to each sealing bag (270) via a one-way valve; the connecting pipe (212) is fixedly connected inside the sealing block (240), and the two ends of the connecting pipe (211) are respectively connected to the sealing bag (270) and the blocking bag (290); The top wall of the sealing block (240) is fixedly connected to a grouting pipe (213), and the grouting pipe (213) is in communication with the connecting pipe (211).

3. A gas extraction pump truck as claimed in claim 2, characterized in that: The transfer device (100) further comprises a first placement area (160), a second placement area (170), a third placement area (180) and a fourth placement area (190); The carrying box (130) is equally divided into a first placement area (160), a second placement area (170), a third placement area (180) and a fourth placement area (190); A wet vacuum pump (210) is fixedly connected to the second placement area (170).

4. A gas extraction pump truck as claimed in claim 3, characterized in that: A gas collection tank group (300) is arranged in the first placement area (160), and the gas collection tank group (300) is connected to a wet vacuum pump (210); The side wall of the carrying box (130) is provided with a sewage outlet (140) and a water inlet (150), and both the sewage outlet (140) and the water inlet (150) are connected to the gas collection tank group (300).

5. A gas extraction pump truck as claimed in claim 4, characterized in that: A power device group (400) is arranged in the third placement area (180); The power device group (400) includes an engine (410), a generator (420) and a coupling (430); The engine (410) and the generator (420) are symmetrically fixedly connected in the third placement area (180), and the engine (410) and the generator (420) are electrically connected; The motor shaft of the generator (420) is fixedly connected to a coupling (430), and the other end of the coupling (430) is fixedly connected to the shaft of the wet vacuum pump (210).

6. A gas extraction pump truck as claimed in claim 5, characterized in that: A control device group (500) is arranged in the fourth placement area (190); The control device comprises a control box (510), a power box (520), a frequency conversion box (530) and an operating table (540); The fourth placement area (190) is sequentially installed with a control box (510), a power box (520) and a frequency conversion box (530), and the control box (510), the power box (520) and the frequency conversion box (530) are electrically connected; An operating table (540) is fixedly installed in the fourth placement area (190).

7. A gas extraction pump truck as claimed in claim 1, characterized in that: One end of the air pipe (230) away from the suction port (220) is fixedly connected to the drilling device (600); The drilling device (600) comprises a drill bit (610), a suction hole (620) and a filter membrane (630); One end of the air pipe (230) away from the suction port (220) is fixedly connected to the drill bit (610), and a plurality of suction holes (620) are equidistantly provided on the outer wall of the drill bit (610); A filter membrane (630) is fixedly connected to the outer periphery of the air pipe (230), and the filter membrane (630) is provided with a plurality of small holes.

8. A gas extraction pump truck as claimed in claim 2, characterized in that: One end of the grouting pipe (213) away from the sealing block (240) is fixedly connected to the grouting pump (700).

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