A coal mine tunnel type coal seam gas fracturing device

Abstract

The present application relates to a kind of coal mine mining roadway type coal seam gas fracturing device, belong to coal mine gas extraction and fracturing technical field;Including pump truck body, main machine and high-pressure pump are fixedly arranged on pump truck body, the output end of high-pressure pump is provided with the first fracturing pipe and the second fracturing pipe of mutual docking, the outer side of the end of first fracturing pipe and second fracturing pipe away from each other is fixedly sleeved with packer, inner sleeve for shunting is inserted into first fracturing pipe, inner sleeve extends to the inside of second fracturing pipe, and disturbance mechanism is arranged on the outside of first fracturing pipe and second fracturing pipe;Top extension mechanism is arranged on pump truck body, and the chassis of pump truck body is lowered by top extension mechanism;Support mechanism is also arranged on pump truck body, and the support mechanism includes four telescopic arms, and the pump truck body is more stable by the unfolding of four telescopic arms;The problem that the existing roadway type fracturing device is poor in fracturing effect and lacks stability is solved.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas extraction and fracturing technology, specifically relating to a coal seam gas fracturing device for coal mine mining roadways. Background Technology

[0002] In the safe and efficient mining system of coal mines, coal seam gas control is a core technical link. As the mining depth continues to increase, problems such as low coal seam permeability and complex gas occurrence become increasingly prominent. Roadway-type coal seam gas fracturing technology improves coal seam permeability by artificially creating fractures, becoming a key means to solve the problem of safe production in high-gas mines. This technology injects high-pressure liquid into the coal seam through a fracturing device, using hydraulic pressure to break the original structure of the coal body and form a network of interconnected fractures, providing an efficient channel for gas seepage.

[0003] However, existing roadway fracturing devices face many challenges in practical applications. On the one hand, the fine coal powder remaining inside the borehole and the small coal slag generated during the fracturing process can easily form particle accumulation in areas where the flow rate decreases as the fracturing fluid flows. The van der Waals forces and capillary forces between these coal particles will cause the accumulation to form a "self-healing layer" with cementing properties, which will hinder the further expansion of the fracture, reduce the fracturing effect, and cause the gas extraction efficiency to fail to meet the expected target.

[0004] On the other hand, the ground conditions in coal mine roadways are complex and generally uneven. Existing equipment support systems mostly use fixed-angle support legs or simple hydraulic outriggers. During fracturing operations, the strong reaction force generated by the high-pressure pump acts on the fracturing truck. If the fracturing device is not stable enough, it is easy to tilt or even overturn. This will not only affect the normal progress of fracturing operations and prolong the construction period, but may also cause safety accidents, threaten the personal safety of workers, damage equipment, and increase mining costs. Summary of the Invention

[0005] This invention overcomes the shortcomings of the prior art and proposes a coal seam gas fracturing device for coal mine roadways; it solves the problems of poor fracturing effect and insufficient stability of existing roadway fracturing devices.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0007] A coal seam gas fracturing device for coal mine roadways includes a pump truck body. A main unit and a high-pressure pump are fixedly mounted on the pump truck body. The output end of the high-pressure pump has a first fracturing pipe and a second fracturing pipe that are connected to each other. A packer is fixedly sleeved on the outer side of the opposite ends of the first and second fracturing pipes. An inner sleeve for diversion is inserted inside the first fracturing pipe, extending into the second fracturing pipe. A disturbance mechanism is provided on the outer side of the first and second fracturing pipes. A jacking mechanism is provided on the pump truck body. The jacking mechanism includes four fixed blocks, which are respectively fixed to the front and rear ends of the left and right end faces of the pump truck body. A semi-circular toothed column is slidably mounted inside each fixed block and can rotate within the fixed block. A movable wheel is provided at the lower end of each semi-circular toothed column. A support mechanism is also provided on the pump truck body. The support mechanism includes four telescopic arms, which are respectively mounted on the upper ends of the four semi-circular toothed columns. A support plate is provided at the end of each telescopic arm.

[0008] Furthermore, one end of the first fracturing tube is connected to the output end of the high-pressure pump through an air inlet pipe, and the other end of the first fracturing tube is connected to one end of the second fracturing tube. A ring of liquid outlet holes is provided at the connected ends of the first fracturing tube and the second fracturing tube.

[0009] Furthermore, the disturbance mechanism includes a spiral blade, a fixed ring, a first piston cylinder, a compression table, a first air bladder, a second air bladder, a first piston ring, a first spring, and a push rod; a set of spiral blades is provided on the outer surfaces of both the first and second fracturing tubes, and a set of first air bladders is fixedly provided at the outer edge of each set of spiral blades; a first piston cylinder is fixedly sleeved on the outer side of the end where the first and second fracturing tubes meet, and the two sets of first air bladders are respectively connected to the inside of the first piston cylinder on the same side through a first connecting pipe; a first spring is slidably provided inside each first piston cylinder. Piston ring; Two sets of extrusion platforms are slidably sleeved on the outer side of the inner sleeve between the first fracturing tube and the second fracturing tube, and a second air bladder is fixedly installed between the two sets of extrusion platforms; the ends of the two sets of extrusion platforms that are far apart from each other are respectively fixedly connected to the first piston ring on the same side through a connecting rod; a fixing ring is fixedly sleeved on the outer side of the inner sleeve between the two sets of extrusion platforms, and a set of first springs is fixedly installed between the fixing ring and the extrusion platforms on both sides; a set of push rods is fixedly installed on the end face of the two sets of extrusion platforms that are far apart from each other, and the ends of the two sets of push rods that are far apart from each other are slidably inserted into the inside of the two rings of liquid outlet holes.

[0010] Furthermore, the disturbance mechanism also includes a second piston cylinder, a second piston ring, a first air pipe, a second air pipe, and an air pump. A second piston cylinder is fixedly installed at the ends of the two packers that are close to each other, and a second piston ring is slidably installed inside the opening of each second piston cylinder. A first air pipe is fixedly installed on the inner wall of the inner sleeve, and a second air pipe is fixedly installed on the inner wall of the first fracturing pipe. An air pump is fixedly installed on the pump truck body. One end of both the first and second air pipes is connected to the output end of the air pump. The end of the first air pipe furthest from the air pump is connected to the inside of the second piston cylinder outside the second fracturing pipe, and the end of the second air pipe furthest from the air pump is connected to the inside of the second piston cylinder outside the first fracturing pipe.

[0011] Furthermore, the top extension mechanism also includes a hydraulic push rod, a support plate, a push rod, a first rack, an insert rod, and a second spring; an action groove is provided in the middle of the lower end face of the pump truck body, and a support plate is slidably arranged inside the action groove. A first conical surface is provided at the lower end of the outer cylindrical surface of the support plate; a hydraulic push rod is fixedly arranged at the upper end of the pump truck body, and the telescopic end of the hydraulic push rod is fixedly connected to the support plate; a first connecting groove is provided on the front and rear sides of the action groove, and a push rod is slidably arranged inside each first connecting groove; a first inclined surface is provided at the end of the push rod near the support plate, and the first inclined surface maintains sliding contact with the first conical surface on the support plate; an insert rod and two first racks are fixedly arranged at the end of the push rod away from the support plate; a second sliding groove and two first sliding grooves are provided on the inner wall of the side of the two first connecting grooves that are far apart from each other; the two first racks are slidably inserted into the two first sliding grooves on the same side; the insert rod is slidably inserted into the second sliding groove on the same side; and a second spring is sleeved on the outside of the insert rod.

[0012] Furthermore, the top extension mechanism also includes a first gear; a first mounting groove is provided inside each fixed block, the horizontal cross-section of the first mounting groove is a fan-shaped structure, and a semi-circular toothed column is provided inside the first mounting groove, which can slide and rotate inside the first mounting groove; four first sliding grooves are respectively connected to the first mounting grooves inside the four fixed blocks through second connecting grooves, and a first gear is rotatably provided inside each second connecting groove, the first gear meshing with the first rack inside the first sliding groove and the semi-circular toothed column inside the first mounting groove.

[0013] Furthermore, the top extension mechanism also includes a toothed plate, a third spring, a transmission rod, a transmission gear, a second gear, a mounting plate, a lifting rod, and a second rack. A toothed plate is slidably arranged on each of the left and right sides of the action groove. A third spring is fixed between the toothed plate and the pump truck body. A second inclined surface is provided at the end of the toothed plate near the action groove, and the second inclined surface maintains sliding contact with the first conical surface on the support plate. A horizontal transmission rod is rotatably arranged on each of the left and right sides inside the pump truck body. A transmission gear is fixedly arranged in the middle of each of the two transmission rods, and the two transmission gears are respectively engaged with the two toothed plates. The transmission rods are meshed; a second gear is fixedly installed at both ends of each transmission rod, and a mounting plate is rotatably installed at the lower end of each semi-circular toothed column. The moving wheel is rotatably installed at the lower end of the mounting plate. A lifting rod is fixedly installed on each mounting plate, and a vertical guide rail is fixedly installed on the outer side of the pump body on one side of each fixed block. A guide groove is provided on each lifting rod, and the guide groove is slidably engaged with the outer side of the guide rail. A vertical second rack is fixedly installed at the end of each lifting rod away from the mounting plate, and the four second racks mesh with the four second gears respectively.

[0014] Furthermore, the support mechanism also includes a support plate; a support plate is fixedly installed on the upper end of each semi-circular toothed column; the telescopic arm includes a first support arm, a second support arm, and an extension arm; the lower end of the first support arm is hinged to the support plate, the upper end of the first support arm is hinged to one end of the second support arm, and an extension arm is slidably inserted into the end of the second support arm away from the first support arm; a first electric push rod is provided between the first support arm and the second support arm, and a second electric push rod is fixedly installed on the outside of the second support arm, with one end of the piston rod of the second electric push rod fixedly connected to the extension arm.

[0015] Furthermore, the support mechanism also includes a third rack, a fourth rack, a third gear, and a pressure sensor; a third rack is fixedly mounted on the piston rod of the second electric push rod, a fourth rack is slidably mounted on the second support arm, a third gear is rotatably mounted on the second support arm, and the third rack and the fourth rack are located on both sides of the third gear and are both meshed with the third gear; a support plate is rotatably mounted at the lower end of the extension arm, the middle part of the support plate is hinged to the extension arm, and a pressure sensor is fixedly mounted on one side of the support plate.

[0016] Furthermore, the support mechanism also includes a bidirectional threaded rod, a motor, a limiting rod, a slider, a connecting rod, an arc-shaped slide rail, and an arc-shaped block. A bidirectional threaded rod is rotatably mounted on the upper end of the pump truck body via a fixed frame, with two threaded segments of opposite directions on the outer side of the bidirectional threaded rod. A motor is fixedly mounted on the fixed frame, and the output shaft of the motor is fixedly connected to one end of the bidirectional threaded rod. A limiting rod of the same horizontal direction is also fixedly mounted on the fixed frame. Two sliders are screwed onto the outer side of the bidirectional threaded rod, and the two sliders are respectively screwed onto the two threaded segments of opposite directions on the outer side of the bidirectional threaded rod. Both sliders are slidably sleeved on the outer side of the limiting rod. A telescopic connecting rod is rotatably mounted on both sides of each slider, and an arc-shaped slide rail is rotatably mounted on the end of the connecting rod away from the slider. Both ends of the connecting rod are rotatably connected to the slider and the arc-shaped slide rail via ball joint structures. An arc-shaped block is fixedly mounted on the outer side of the upper end of each of the four first support arms, and the four arc-shaped blocks are slidably engaged inside the four arc-shaped slide rails.

[0017] The beneficial effects of this invention compared to the prior art are as follows:

[0018] (1) The problem of coal dust accumulation is effectively solved by the synergistic effect of the spiral blade and pulse negative pressure in the disturbance mechanism; the spiral blade guides the fracturing fluid to form a spiral flow, which generates continuous scouring stress on the borehole wall and prevents coal dust from accumulating and forming coal cakes that affect the expansion of the fracture; the air pump controls the pressure change of the second piston cylinder according to the preset cycle, so that the second piston ring reciprocates and generates pulse negative pressure to disturb the coal slag in the fracture; this composite disturbance method effectively destroys the cemented deposits that have formed in the fracture, prevents coal slag from accumulating in the fracture, ensures the continuous expansion of the fracture, provides a smoother channel for gas seepage, greatly improves the permeability of the coal seam, and thus improves the gas extraction efficiency.

[0019] (2) The top extension mechanism and the support mechanism work together to realize the adaptive and stable support of the device under complex roadway ground conditions; the hydraulic push rod pushes the support plate down, the nail teeth penetrate into the stratum to provide initial anchoring force, and at the same time, through a series of mechanical transmissions, the moving wheels move up, thereby lowering the chassis of the pump truck and improving overall stability; then, the first support arm, the second support arm and the extension arm work together to unfold, and the barb at the bottom of the support plate cuts into the coal seam floor to form a stable triangular support structure.

[0020] (3) The pressure sensor monitors the ground pressure in real time and adjusts the output force of the second electric push rod through the PLC controller and PID algorithm so that the four support plates are stably pressed against the ground, effectively preventing the device from tilting or overturning under the reaction force of the high-pressure pump, ensuring the personal safety of the operators and the safety of the equipment; the support plates are stored in the protective cover when not in use to prevent workers from accidentally touching the barb and causing injury. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a connection diagram of the first fracturing tube, the second fracturing tube, and the disturbance mechanism. Figure 1 ;

[0024] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle;

[0025] Figure 4 This is a connection diagram of the first fracturing tube, the second fracturing tube, and the disturbance mechanism. Figure 2 ;

[0026] Figure 5 This is a connection diagram of the first fracturing tube, the second fracturing tube, and the disturbance mechanism. Figure 3 ;

[0027] Figure 6 yes Figure 5 A magnified view of a portion of point G in the middle;

[0028] Figure 7 This is a schematic diagram of the internal structure of the pump truck body;

[0029] Figure 8 yes Figure 7 A magnified view of a portion of point B in the middle;

[0030] Figure 9 yes Figure 7 A magnified view of a portion of point C in the middle;

[0031] Figure 10 This is a schematic diagram of the connection between the pump truck body and the support mechanism. Figure 1 ;

[0032] Figure 11 yes Figure 10 A magnified view of a portion of point F in the middle;

[0033] Figure 12 This is a partial connection diagram of the pump truck body and the support mechanism;

[0034] Figure 13 yes Figure 12 A magnified view of a portion of point D in the middle;

[0035] Figure 14 yes Figure 12 A magnified view of a portion of point E in the middle;

[0036] Among them, 1 is the pump truck body, 2 is the first fracturing pipe, 3 is the second fracturing pipe, 4 is the packer, 5 is the inner sleeve, 6 is the support plate, 7 is the spiral blade, 8 is the first piston cylinder, 9 is the second piston cylinder, 10 is the extrusion table, 11 is the first airbag, 12 is the second airbag, 13 is the first piston ring, 14 is the second piston ring, 15 is the first air pipe, 16 is the second air pipe, 17 is the air pump, 18 is the first spring, 19 is the push rod, 20 is the hydraulic push rod, 21 is the support plate, 22 is the push rod, 23 is the toothed plate, 24 is the first rack, 25 is the insertion rod, 26 is the second spring, and 27 is the third Spring, 28 is the transmission rod, 29 is the second gear, 30 is the lifting rod, 31 is the second rack, 32 is the semi-circular toothed column, 33 is the first gear, 34 is the first support arm, 35 is the second support arm, 36 is the extension arm, 37 is the support plate, 38 is the first electric push rod, 39 is the second electric push rod, 40 is the third rack, 41 is the third gear, 42 is the fourth rack, 43 is the motor, 44 is the bidirectional threaded rod, 45 is the slider, 46 is the limit rod, 47 is the connecting rod, 48 is the arc-shaped slide rail, 49 is the arc-shaped block, 50 is the protective cover, 51 is the pressure sensor, and 52 is the high-pressure pump. Detailed Implementation

[0037] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0038] like Figure 1 As shown in Figure 14, this invention provides a coal seam gas fracturing device for coal mine roadways, including a pump truck body 1. A main unit and a high-pressure pump 52 are fixedly mounted on the pump truck body 1. The output end of the high-pressure pump 52 is provided with a first fracturing pipe 2 and a second fracturing pipe 3 that are connected to each other. A packer 4 is fixedly sleeved on the outer side of the opposite ends of the first fracturing pipe 2 and the second fracturing pipe 3. An inner sleeve 5 for diversion is inserted inside the first fracturing pipe 2, extending into the second fracturing pipe 3. A disturbance mechanism is provided on the outer side of the first fracturing pipe 2 and the second fracturing pipe 3. The main body 1 is provided with a top extension mechanism, which includes four fixed blocks. The four fixed blocks are respectively fixedly installed at the front and rear ends of the left and right side end faces of the pump truck body 1. A semi-circular toothed column 32 is slidably installed inside each fixed block. The semi-circular toothed column 32 can rotate inside the fixed block. A movable wheel is provided at the lower end of each semi-circular toothed column 32. A support mechanism is also provided on the pump truck body 1. The support mechanism includes four telescopic arms. The four telescopic arms are respectively installed at the upper ends of the four semi-circular toothed columns 32. A support plate 6 is provided at the end of each telescopic arm.

[0039] The axes of the first fracturing tube 2 and the second fracturing tube 3 are aligned. One end of the first fracturing tube 2 is connected to the output end of the high-pressure pump 52 via an air inlet pipe. The other end of the first fracturing tube 2 is connected to one end of the second fracturing tube 3. The end of the second fracturing tube 3 away from the first fracturing tube 2 is kept closed. The end of the inner sleeve 5 away from the second fracturing tube 3 extends to the air inlet pipe. The connected ends of the first fracturing tube 2 and the second fracturing tube 3 are fixedly sleeved on the outside of the inner sleeve 5. A ring of liquid outlet holes is provided at the connected ends of the first fracturing tube 2 and the second fracturing tube 3, and the ring of liquid outlet holes is located on the outside of the inner sleeve 5.

[0040] The disturbance mechanism includes a spiral blade 7, a fixed ring, a first piston cylinder 8, a second piston cylinder 9, a compression table 10, a first air bladder 11, a second air bladder 12, a first piston ring 13, a second piston ring 14, a first air pipe 15, a second air pipe 16, an air pump 17, a first spring 18, and a push rod 19.

[0041] A set of spiral blades 7 is provided on the outer surface of both the first fracturing tube 2 and the second fracturing tube 3, with the two sets of spiral blades 7 rotating in opposite directions. A set of first airbags 11 is fixedly installed at the outer edge of each set of spiral blades 7. A circular first piston cylinder 8 is fixedly sleeved on the outer side of the end where the first fracturing tube 2 and the second fracturing tube 3 meet, with the openings of the two first piston cylinders 8 facing away from each other. The two sets of first airbags 11 are respectively connected to the inside of the first piston cylinder 8 on the same side through a first connecting pipe. A first piston ring 13 is slidably installed inside each first piston cylinder 8, and the pressure of the gas inside the first piston cylinder 8 is controlled by the sliding of the first piston ring 13 inside the first piston cylinder 8.

[0042] Two sets of extrusion plates 10 are slidably sleeved on the outer side of the inner sleeve 5 between the first fracturing tube 2 and the second fracturing tube 3. A ring of second airbags 12 is fixedly installed between the two sets of extrusion plates 10. The ends of the two sets of extrusion plates 10 that are far apart from each other are respectively fixedly connected to the first piston ring 13 on the same side by a connecting rod. A ring of fixing ring is fixedly sleeved on the outer side of the inner sleeve 5 between the two sets of extrusion plates 10. A set of first springs 18 arranged in a circular array is fixedly installed on both end faces of the fixing ring. The length direction of the first springs 18 is parallel to the axis of the inner sleeve 5. The ends of the two sets of first springs 18 that are far apart from the fixing ring are fixedly connected to the extrusion plates 10 on the same side. A set of push rods 19 arranged in a circular array is fixedly installed on the end face of the two sets of extrusion plates 10 that are far apart from each other. The length direction of the push rods 19 is parallel to the axis of the inner sleeve 5. The ends of the two sets of push rods 19 that are far apart from each other are slidably inserted into the inside of the two rings of liquid outlet holes.

[0043] When the two sets of extrusion platforms 10 approach each other, the second airbag 12 is compressed and inflated by the two sets of extrusion platforms 10. The ends of the two sets of push rods 19 that are far apart from each other are dislodged from the two rings of liquid outlet holes. At the same time, the two sets of extrusion platforms 10 drive the two first piston rings 13 to approach each other through the connecting rod, thereby increasing the gas pressure inside the two first piston cylinders 8. When the two sets of extrusion platforms 10 move away from each other, the second airbag 12 is no longer compressed and shrinks by the two sets of extrusion platforms 10. The ends of the two sets of push rods 19 that are far apart from each other are respectively inserted into the two rings of liquid outlet holes. At the same time, the two sets of extrusion platforms 10 drive the two first piston rings 13 to move away from each other through the connecting rod, thereby decreasing the gas pressure inside the two first piston cylinders 8.

[0044] A second piston cylinder 9 is fixedly installed at the ends of the two packers 4 that are close to each other. The two second piston cylinders 9 are fixedly sleeved on the outside of the first fracturing tube 2 and the second fracturing tube 3, respectively, and the two piston cylinders are located on the side away from each other of the two sets of spiral blades 7. The openings of the two second piston cylinders 9 face each other, and a second piston ring 14 is slidably installed inside the opening of each second piston cylinder 9. A first air pipe 15 is fixedly installed on the inner wall of the inner sleeve 5, and a second air pipe 16 is fixedly installed on the inner wall of the first fracturing tube 2. An air pump 17 is fixedly installed on the pump truck body 1. One end of the first air pipe 15 and the second air pipe 16 are connected to the output end of the air pump 17 through a second connecting pipe. The end of the first air pipe 15 away from the air pump 17 is connected to the inside of the second piston cylinder 9 outside the second fracturing tube 3, and the end of the second air pipe 16 away from the air pump 17 is connected to the inside of the second piston cylinder 9 outside the first fracturing tube 2.

[0045] The extension mechanism also includes a hydraulic push rod 20, a support plate 21, a push rod 22, a first rack 24, a first gear 33, a plug rod 25, a second spring 26, a toothed plate 23, a third spring 27, a transmission rod 28, a transmission gear, a second gear 29, and a second rack 31.

[0046] A recessed actuation groove is provided in the middle of the lower end face of the pump truck body 1. A support plate 21 is slidably arranged vertically inside the actuation groove. The support plate 21 is a horizontally arranged circular plate structure. Multiple nail teeth are fixedly provided on the lower end face of the support plate 21. A first conical surface with a thicker upper surface and a thinner lower surface is provided at the lower end of the outer cylindrical surface of the support plate 21. A hydraulic push rod 20 is fixedly provided on the upper end of the pump truck body 1. The telescopic end of the hydraulic push rod 20 extends vertically downward into the actuation groove and is fixedly connected to the center of the upper end face of the support plate 21.

[0047] A first connecting groove is provided on both the front and rear sides of the action groove, and the action groove is connected to the first connecting groove. Two symmetrical T-shaped push rods 22 are provided on both the front and rear sides of the support plate 21. The two push rods 22 are slidably disposed in the two first connecting grooves along the front-back direction. Each push rod 22 includes a transverse section and a longitudinal section. The transverse section is horizontally arranged along the left-right direction, and the longitudinal section is horizontally arranged along the front-back direction. The longitudinal section is located on the side of the transverse section closer to the support plate 21. A first inclined surface is provided at the end of the longitudinal section closer to the support plate 21. The first inclined surface on the longitudinal section maintains sliding contact with the first conical surface on the support plate 21. The end of the longitudinal section away from the support plate 21 is fixedly connected to the middle of the transverse section.

[0048] A first rack 24 is fixedly installed at each end of the transverse section of the push rod 22. The first rack 24 is located on the side of the transverse section away from the longitudinal section and is horizontally arranged along the front-back direction. Two symmetrical first sliding grooves are respectively provided on the inner wall of the side of the two first connecting grooves that are far apart from each other. The two first racks 24 on each push rod 22 are slidably inserted into the two first sliding grooves on the same side along the front-back direction. A set of second sliding grooves is also provided on the inner wall of the side of the two first connecting grooves that are far apart from each other. Each set of second sliding grooves is respectively located between the two first sliding grooves on the same side. Multiple insertion rods 25 are fixedly installed on the end face of the transverse section of the push rod 22 that is far apart from the longitudinal section. The insertion rods 25 are horizontally arranged along the front-back direction, and the ends of the multiple insertion rods 25 that are far apart from the push rod 22 are slidably inserted into the set of second sliding grooves on the same side. A second spring 26 is sleeved on the outside of each insertion rod 25. One end of the second spring 26 is fixedly connected to the transverse section of the push rod 22, and the other end of the second spring 26 is fixedly connected to the outside of the opening of the second sliding groove.

[0049] Each fixed block has a vertically penetrating first mounting groove with a fan-shaped horizontal cross-section and an angle of 225°. A semi-circular toothed column 32 is installed inside the first mounting groove, capable of both sliding and rotating within it. Four first sliding grooves are connected to the first mounting grooves inside the four fixed blocks via second connecting grooves. A first gear 33 is rotatably installed inside each second connecting groove, meshing with both the first rack 24 inside the first sliding groove and the semi-circular toothed column 32 inside the first mounting groove.

[0050] A third sliding groove is provided on each of the left and right sides of the action groove. The third sliding grooves are horizontally arranged in the left and right direction, and the ends of the two third sliding grooves that are close to each other are connected to the action groove. A toothed plate 23 is slidably arranged inside each third sliding groove in the left and right direction. A second inclined surface is provided on the end of the toothed plate 23 that is close to the action groove. The second inclined surface on the toothed plate 23 maintains sliding contact with the first conical surface on the support plate 21. A recessed second mounting groove is provided on the bottom surface inside each third sliding groove. A third spring 27 extending left and right is provided inside each second mounting groove. One end of the third spring 27 is fixedly connected to the inner wall of the second mounting groove, and the other end of the third spring 27 is fixedly connected to the toothed plate 23 on the same side. A horizontal transmission rod 28 is rotatably arranged on each of the left and right sides of the pump truck body 1. A transmission gear is fixedly arranged in the middle of each of the two transmission rods 28, and the two transmission gears mesh with the two toothed plates 23 respectively. A second gear 29 is fixedly arranged at both ends of each transmission rod 28, and the second gear 29 extends to the outer side of the end face of the pump truck body 1. A mounting plate is rotatably mounted at the lower end of each semi-circular toothed column 32, and the movable wheel is rotatably mounted at the lower end of the mounting plate. A lifting rod 30 is fixedly mounted on each mounting plate. A vertical guide rail is fixedly mounted on the outer surface of the pump truck body 1 on one side of each mounting plate. Each lifting rod 30 has a guide groove that slidably engages with the outer side of the guide rail. A vertical second rack 31 is fixedly mounted at the end of each lifting rod 30 away from the mounting plate, and the four second racks 31 mesh with four second gears 29 respectively.

[0051] The support mechanism also includes a support plate 37, a third rack 40, a fourth rack 42, a third gear 41, a motor 43, a bidirectional threaded rod 44, a slider 45, a connecting rod 47, an arc-shaped slide rail 48, and an arc-shaped block 49.

[0052] An L-shaped support plate 37 is fixedly installed on the upper end of each semi-circular toothed column 32. The support plate 37 includes a horizontal plate and a vertical plate. The horizontal plate is fixedly installed on the upper end of the semi-circular toothed column 32, and the lower end of the vertical plate is fixedly connected to the edge of the horizontal plate near the pump truck body 1.

[0053] The telescopic arm includes a first support arm 34, a second support arm 35, and an extension arm 36. The lower end of the first support arm 34 is hinged to the upper end of the horizontal plate of the support plate 37, and the upper end of the first support arm 34 is hinged to one end of the second support arm 35. An extension arm 36 is slidably inserted into the end of the second support arm 35 away from the first support arm 34. A first electric push rod 38 is provided between the first support arm 34 and the second support arm 35. The bottom end of the first electric push rod 38 is inclined upwards and hinged to the first support arm 34, while the piston end of the first electric push rod 38 is inclined downwards and hinged to the second support arm 35. The extension and retraction of the first electric push rod 38 controls the rotation of the second support arm 35 relative to the first support arm 34. A second electric push rod 39 is fixedly provided on the outside of the second support arm 35. One end of the piston rod of the second electric push rod 39 is fixedly connected to the extension arm 36. The extension and retraction of the second electric push rod 39 controls the extension and retraction of the extension arm 36 at the end of the second support arm 35.

[0054] Two symmetrical third racks 40 are fixedly mounted on the piston rod of the second electric push rod 39, with the length direction of the third racks 40 parallel to the sliding direction of the extension arm 36. A fourth rack 42 is slidably mounted on both sides of each second support arm 35, and a third gear 41 is rotatably mounted on both sides of each second support arm 35. The third racks 40 and fourth racks 42 on the same side are located on either side of the third gear 41 and mesh with it. A support plate 6 is rotatably mounted at the lower end of the extension arm 36, with its middle section hinged to the extension arm 36. Multiple barbs are fixedly mounted on the end of the support plate 6 away from the extension arm 36. A pressure sensor 51 is fixedly mounted on one side of each support plate 6. A protective cover 50 is fixedly mounted on the lower outer side of each second support arm 35, with the support plate 6 located inside the protective cover 50.

[0055] A horizontally aligned bidirectional threaded rod 44 is rotatably mounted on the upper end of the pump truck body 1 via a fixed frame. Two threaded segments with opposite directions of rotation are provided on the outer side of the bidirectional threaded rod 44. A motor 43 is fixedly mounted on the fixed frame, and the output shaft of the motor 43 is fixedly connected to one end of the bidirectional threaded rod 44, driving the bidirectional threaded rod 44 to rotate. A horizontally aligned limiting rod 46 is also fixedly mounted on the fixed frame. Two symmetrically aligned sliders 45 are screwed onto the outer side of the bidirectional threaded rod 44, respectively screwed onto the two threaded segments with opposite directions of rotation on the outer side of the bidirectional threaded rod 44. Both sliders 45 are slidably sleeved on the outer side of the limiting rod 46. A retractable connecting rod 47 is rotatably mounted on both sides of each slider 45, with an arc-shaped slide rail 48 rotatably mounted at the end of the connecting rod 47 away from the slider 45. Both ends of the connecting rod 47 are rotatably connected to the slider 45 and the arc-shaped slide rail 48 via ball joint structures. An arc-shaped block 49 is fixedly installed on the outer side of the upper end of each of the four first support arms 34, and the four arc-shaped blocks 49 are slidably engaged with the inside of the four arc-shaped slide rails 48.

[0056] The working principle of this invention is as follows:

[0057] I. Preparation process before the assignment

[0058] In the initial state, both the first support arm 34 and the second support arm 35 are in a vertical state. The extension arm 36 extends into the second support arm 35. The fourth rack 42 blocks the support plate 6 at the lower end of the extension arm 36, so that the support plate 6 and the extension arm 36 remain parallel, and the support plate 6 is located inside the protective cover 50.

[0059] Once the pump truck body 1 has traveled to the target area in the roadway via its moving wheels, the operator controls the hydraulic push rod 20 to extend, causing the support plate 21 to descend. During the descent of the support plate 21, the first cone surface on the support plate 21 presses against the first inclined surface on the push rod 22 and the second inclined surface on the toothed plate 23, causing the two push rods 22 and the two toothed plates 23 to move away from each other.

[0060] As the two push rods 22 move away from each other, they also cause the first racks 24 on both sides to move away from each other, and simultaneously cause the insert rods 25 on both sides to move away from each other. The insert rods 25 are inserted into the second sliding groove, thereby compressing the second spring 26. As the first racks 24 on both sides move away from each other, the four first racks 24 drive the four first gears 33 to rotate, the four first gears 33 drive the four semi-circular toothed columns 32 to rotate, the four semi-circular toothed columns 32 drive the four support plates 37 to rotate, and the four support plates 37 drive the four telescopic arms to rotate respectively. During the rotation of the telescopic arms, the arc-shaped block 49 on the first support arm 34 slides inside the arc-shaped slide rail 48.

[0061] As the two toothed plates 23 move away from each other, the two third springs 27 are compressed, simultaneously driving the two transmission gears to rotate. These gears, in turn, drive the two transmission rods 28 to rotate, which in turn drive the second gears 29 at both ends to rotate. The second gears 29 drive the second rack 31, which meshes with them, to slide upwards. The second rack 31, via the lifting rod 30, drives the mounting plate to slide upwards. The mounting plate then drives the moving wheel to move upwards, and simultaneously, the mounting plate drives the semi-circular toothed column 32 to slide upwards within the second mounting groove of the fixed block. The semi-circular toothed column 32 drives the support plate 37 to slide upwards, and the support plate 37 drives the telescopic arm to slide upwards. Because the moving wheel slides upwards, the chassis of the pump truck body 1 continuously descends, thereby improving the overall stability of the fracturing device. As the telescopic arm slides upwards, it drives the arc-shaped block 49 to rise synchronously, causing the arc-shaped slide rail 48 to rise synchronously as well. This causes the end of the connecting rod 47 furthest from the slider 45 to rise, and simultaneously, the connecting rod 47 is lengthened.

[0062] As the support plate 21 descends, the four telescopic arms rotate simultaneously as they slide upwards. Once the spikes at the lower end of the support plate 21 make stable contact with the ground, each of the four telescopic arms rotates outwards by 45°. At this point, the support plate 21 forms an initial stable fulcrum through the friction between the spikes and the ground and the supporting force of the hydraulic push rod 20.

[0063] The first electric push rod 38 is extended, causing the second support arm 35 to rotate outward. Then, the motor 43 is rotated, driving the bidirectional threaded rod 44 to rotate. Guided by the limit rod 46, the bidirectional threaded rod 44 causes the two sliders 45 to move away from each other. The angle between the connecting rods 47 on both sides of the sliders 45 gradually increases. The two sliders 45, through the connecting rods 47, drive the arc-shaped slide rail 48 to move outward, thus causing the upper end of the first support arm 34 to rotate outward. Then, the second electric push rod 39 is extended, and the extension arm 36 extends outward towards the lower end of the second support arm 35. The extension arm 36 causes the support plate 6 to move downward, causing the support plate 6 to detach from the protective cover 50. When the second electric push rod 39 extends, it causes the third rack 40 to slide downward. The third rack 40 drives the third gear 41 to rotate, and the third gear 41 drives the fourth rack 42 to slide upward along the second support arm 35, causing the lower end of the fourth rack 42 to gradually detach from the support plate 6. Thus, the support plate 6 remains horizontal under the influence of gravity. Subsequently, support plate 6 contacts the ground, and the barbs at the lower end of support plate 6 make stable contact with the ground. In this way, the four extended telescopic arms are stably supported by the support plates 6 and the ground, ensuring the overall stability of the fracturing device. When support plate 6 contacts the ground, the pressure sensor 51 on support plate 6 is subjected to pressure. The pressure sensor 51 transmits the signal to the PLC controller, which adjusts the output force of the second electric push rod 39 through the PID algorithm, so that the four support plates 6 stably support the ground, and the barbs at the bottom of support plate 6 cut into the coal seam floor, forming a stable triangular support structure.

[0064] II. Fracturing Operation Implementation Process

[0065] The second fracturing tube 3 and the first fracturing tube 2 are inserted into the borehole in sequence until the target fracturing area is reached. Then, the packers 4 at both ends are inflated, so that the rubber seals of the packers 4 expand and stick tightly to the inner wall of the borehole, thereby forming an independent fracturing section between the two packers 4 to prevent fracturing fluid leakage and ensure that the fracturing operation is carried out in a specific area.

[0066] Next, air pump 17 starts operating, injecting compressed air into the two second piston cylinders 9 through the first air pipe 15 and the second air pipe 16, respectively, so that the pressure inside the two second piston cylinders 9 reaches the set value. Then, high-pressure pump 52 starts operating, pumping fracturing fluid into the first fracturing tube 2. Half of the fracturing fluid enters the internal area of ​​the first fracturing tube 2 outside the inner casing 5, and the other half of the fracturing fluid enters the second fracturing tube 3 through the inner casing 5. As high-pressure pump 52 continues to operate, the first fracturing tube 2 and the second fracturing tube 3 are filled with fracturing fluid, and the pressure inside the first fracturing tube 2 and the second fracturing tube 3 increases, pushing the push rods 19 inside the two rings of fluid outlets outward. The fracturing fluid inside the first fracturing tube 2 and the second fracturing tube 3 is output outward through the two rings of fluid outlets to the independent fracturing section. As the push rod 19 is pushed out to the outside of the fluid outlet, the two sets of push rods 19 approach each other. The two sets of push rods 19 drive the two sets of extrusion platforms 10 to approach each other. The two sets of extrusion platforms 10, which approach each other, simultaneously extrude the second airbag 12 and the two sets of first springs 18, causing the internal air pressure of the second airbag 12 to increase and expand. The expanded second airbag 12 is tightly attached to the inner wall of the borehole. As the two sets of extrusion platforms 10 approach each other, the two sets of extrusion platforms 10 drive the two first piston rings 13 to approach each other, increasing the internal gas pressure of the two first piston cylinders 8. The two first piston cylinders 8 respectively inflate the two first airbags 11, causing the two first airbags 11 to expand. The expanded first airbags 11 are tightly attached to the inner wall of the borehole. In this way, the spiral blade 7 guides the fracturing fluid to form a spiral flow, generating scouring stress on the borehole wall, effectively removing fine coal powder particles, and preventing coal powder from accumulating and forming coal cakes that hinder the fracturing fluid from entering the fracture.

[0067] As fracturing progresses, fracturing fluid is injected into the coal seam at a specific pressure, forming the main fracture at the original fracture. During this period, the air pump 17 operates according to a preset "depressurization-pressurization" cycle, controlling the alternating pressure changes in the corresponding second piston cylinder 9 through the first air pipe 15 and the second air pipe 16. When the air pump 17 is operating, the high-pressure pump 52 stops pumping fracturing fluid into the first fracturing pipe 2 and the second fracturing pipe 3. During the depressurization phase, the second piston ring 14 moves into the second piston cylinder 9, generating a pulse negative pressure on the fracturing fluid in the fracture, disrupting the formed cemented deposits, and causing the fine coal slag generated during fracturing to be disturbed by the negative pressure, preventing the coal slag from accumulating in the fracture and affecting fracture propagation. During the pressurization phase, the second piston ring 14 extends outward from the second piston cylinder 9, restoring the initial pressure. Subsequently, the high-pressure pump 52 restarts to pump fracturing fluid into the fracture for fracturing operation, repeating this operation to propagate the fracture to the expected state.

[0068] III. Work Completion and Equipment Reset Process

[0069] After the fracturing operation is completed, the first fracturing tube 2 and the second fracturing tube 3 are removed. The second electric push rod 39 is controlled to retract, so that the extension arm 36 is retracted into the second support arm 35, and the support plate 6 is lifted off the ground. When the second electric push rod 39 retracts, it drives the third rack 40 to move in the opposite direction, drives the third gear 41 to rotate in the opposite direction, thereby driving the fourth rack 42 to extend outward and push the support plate 6, so that the support plate 6 rotates to a state parallel to the extension arm 36. Then the support plate 6 is retracted into the protective cover 50, completing the storage of the support plate 6.

[0070] Next, the first electric push rod 38 is retracted, causing the angle between the second support arm 35 and the first support arm 34 to gradually decrease until it returns to its original position. At the same time, the motor 43 is controlled to rotate in the opposite direction, driving the bidirectional threaded rod 44 to rotate in the opposite direction. Under the guidance of the limit rod 46, the two sliders 45 are driven to move closer to each other. The angle between the connecting rods 47 on both sides of the slider 45 gradually decreases. The slider 45 drives the arc-shaped slide rail 48 to gradually return to its original position through the connecting rods 47 on both sides, so that the first support arm 34 returns to its initial position, thereby completing the folding of the telescopic arm.

[0071] Subsequently, the hydraulic push rod 20 begins to retract, causing the support plate 21 to rise. As the support plate 21 rises, the push rods 22 on both sides begin to reset under the restoring force of the second spring 26. The push rod 22 drives the first rack 24 to move in the opposite direction, causing the first gear 33 meshing with the first rack 24 to rotate in the opposite direction, which in turn causes the semi-circular tooth column 32 to rotate in the opposite direction until it resets. At the same time, the tooth plate 23 moves in the opposite direction under the restoring force of the third spring 27, causing the transmission gear to rotate in the opposite direction. The transmission gear drives the transmission rod 28 to rotate in the opposite direction, and the transmission rod 28 drives the second gear 29 to rotate in the opposite direction. The second gear 29 drives the second rack 31 to descend, and the lifting rod 30 drives the moving wheel to gradually contact the ground, thus completing the switch from the working mode to the moving mode.

[0072] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A coal seam gas fracturing device for coal mine roadways, characterized in that: The utility model provides a fracturing truck, including pump car body (1), the main body machine and high pressure pump (52) are fixedly arranged on pump car body (1), the output of high pressure pump (52) is provided with mutually butt joint's first fracturing pipe (2) with second fracturing pipe (3), the outer side of the end of first fracturing pipe (2) with second fractivating pipe (3) mutually away from is fixedly sleeved with packer (4), the inside of first fracturing pipe (2) is inserted with the inner sleeve (5) for shunting, and the inner sleeve (5) extends to the inside of second fracturing pipe (3), and the outer side of first fracturing pipe (2) with second fracturing pipe (3) is provided with perturbation mechanism;Top mechanism is provided on pump car body (1), and the top mechanism includes four fixed blocks, and four fixed blocks are fixedly arranged on the front and rear ends of the left and right two side faces of pump car body (1) respectively, and one half circular tooth column (32) is slidably arranged in each fixed block, and the half circular tooth column (32) can rotate in the fixed block simultaneously, and each half circular tooth column (32) lower end is provided with a moving wheel respectively;Support mechanism is further provided on pump car body (1), and the support mechanism includes four telescopic arms, and four telescopic arms are arranged on the upper end of four half circular tooth columns (32) respectively, and the end of each telescopic arm is provided with a support plate (6) respectively; One end of first fracturing pipe (2) is connected with the output of high pressure pump (52) through air inlet pipe, and the other end of first fracturing pipe (2) is mutually butt jointed with one end of second fracturing pipe (3), and a circle of liquid outlet holes are arranged on the mutually butt jointed end of first fracturing pipe (2) and second fracturing pipe (3); The perturbation mechanism includes spiral blade (7), fixed ring, first piston cylinder (8), extrusion platform (10), first air bag (11), second air bag (12), first piston ring (13), first spring (18), jacking rod (19);A group of spiral blades (7) are arranged on the outer side of first fracturing pipe (2) and second fracturing pipe (3), and a group of first air bags (11) are fixedly arranged at the outer edge of each group of spiral blades (7);First piston cylinder (8) is fixedly sleeved on the outer side of the mutually butt jointed end of first fracturing pipe (2) and second fracturing pipe (3) respectively, and two groups of first air bags (11) are connected with the inside of the same side first piston cylinder (8) through a first connecting pipe respectively;A first piston ring (13) is slidably arranged in each first piston cylinder (8);Two groups of extrusion platforms (10) are slidably sleeved on the outer side of inner sleeve (5) between first fracturing pipe (2) and second fracturing pipe (3), and a circle of second air bags (12) are fixedly arranged between two groups of extrusion platforms (10);Two groups of extrusion platforms (10) are fixedly connected with the same side first piston ring (13) through a circle of connecting rods respectively on the side away from each other;Fixed ring is fixedly sleeved on the outer side of inner sleeve (5) between two groups of extrusion platforms (10), and a group of first springs (18) are fixedly arranged between fixed ring and two sides extrusion platforms (10) respectively, and a group of jacking rods (19) are fixedly arranged on the side end face away from each other of two groups of extrusion platforms (10) respectively, and the end away from each other of two groups of jacking rods (19) is slidably inserted into two circles of liquid outlet holes respectively; The disturbing mechanism further comprises a second piston cylinder (9), a second piston ring (14), a first air pipe (15), a second air pipe (16) and an air pump (17), the second piston cylinder (9) is fixedly arranged at one end of the two packers (4) close to each other, and the second piston ring (14) is slidably arranged in the opening of each second piston cylinder (9); the first air pipe (15) is fixedly arranged on the inner wall of the inner sleeve (5), the second air pipe (16) is fixedly arranged on the inner wall of the first fracturing pipe (2), the air pump (17) is fixedly arranged on the pump body (1), one end of the first air pipe (15) and the second air pipe (16) is connected with the output end of the air pump (17), the other end of the first air pipe (15) is connected with the inside of the second piston cylinder (9) on the outside of the second fracturing pipe (3), and the other end of the second air pipe (16) is connected with the inside of the second piston cylinder (9) on the outside of the first fracturing pipe (2).

2. The coal mining roadway coal seam gas fracturing device according to claim 1, characterized in that: The top-stretching mechanism further comprises a hydraulic push rod (20), a support disc (21), a push rod (22), a first rack (24), a plug rod (25) and a second spring (26); the action groove is arranged in the middle of the lower end face of the pump body (1), the support disc (21) is slidably arranged in the action groove, and a first conical surface is arranged on the lower end of the outer cylindrical surface of the support disc (21); the hydraulic push rod (20) is fixedly arranged on the upper end of the pump body (1), and the telescopic end of the hydraulic push rod (20) is fixedly connected with the support disc (21); one first communication groove is arranged on each of the front and rear sides of the action groove, and one push rod (22) is slidably arranged in each first communication groove; the end of the push rod (22) close to the support disc (21) is provided with a first inclined surface, the first inclined surface is in sliding contact with the first conical surface on the support disc (21), and the end of the push rod (22) away from the support disc (21) is fixedly provided with the plug rod (25) and two first racks (24); a second sliding groove and two first sliding grooves are arranged on the inner walls of the sides away from each other of the two first communication grooves, the two first racks (24) are slidably inserted into the two first sliding grooves on the same side, and the plug rod (25) is slidably inserted into the second sliding groove on the same side, and the second spring (26) is sleeved on the outside of the plug rod (25).

3. The coal mining roadway type coal seam gas fracturing device according to claim 2, characterized in that: The top-stretching mechanism further comprises a first gear (33); the first installation groove is arranged in each fixed block, the horizontal section of the first installation groove is a sector structure, the semicircular tooth column (32) is arranged in the first installation groove, and the semicircular tooth column (32) can slide and rotate in the first installation groove; the four first sliding grooves are connected with the first installation grooves in the four fixed blocks through the second communication grooves, and one first gear (33) is rotatably arranged in each second communication groove, and the first gear (33) is engaged with the first rack (24) in the first sliding groove and the semicircular tooth column (32) in the first installation groove.

4. The coal mining roadway coal seam gas fracturing device according to claim 3, characterized in that: The top stretching mechanism further comprises tooth plates (23), third springs (27), transmission rods (28), transmission gears, second gears (29), mounting plates, lifting rods (30) and second racks (31); one tooth plate (23) is slidably arranged on the left and right sides of the action groove, the third spring (27) is fixedly arranged between the tooth plate (23) and the pump truck body (1), the end of the tooth plate (23) close to the action groove is provided with a second inclined surface, the second inclined surface is in sliding contact with the first conical surface on the supporting disc (21); one front and back horizontal transmission rod (28) is rotatably arranged on the left and right sides of the pump truck body (1), the middle part of the two transmission rods (28) is fixedly provided with a transmission gear, the two transmission gears are engaged with the two tooth plates (23) respectively; the front and back ends of each transmission rod (28) are fixedly provided with a second gear (29), a mounting plate is rotatably arranged at the lower end of each semicircular tooth column (32), and the moving wheel is rotatably arranged at the lower end of the mounting plate; one lifting rod (30) is fixedly arranged on each mounting plate, a vertical guide rail is fixedly arranged on the outer side of the pump truck body (1) on one side of each fixed block, a guide groove is arranged on each lifting rod (30) and slidably connected to the outer side of the guide rail; a vertical second rack (31) is fixedly arranged at the end of each lifting rod (30) away from the mounting plate, and the four second racks (31) are engaged with the four second gears (29) respectively.

5. The coal mining roadway coal seam gas fracturing device according to claim 1, characterized in that: The supporting mechanism further comprises a supporting plate (37); a supporting plate (37) is fixedly arranged at the upper end of each semicircular tooth column (32) and fixedly arranged at the upper end of the semicircular tooth column (32); the telescopic arm comprises a first supporting arm (34), a second supporting arm (35) and an extension arm (36); the lower end of the first supporting arm (34) is hingedly connected to the supporting plate (37), the upper end of the first supporting arm (34) is hingedly connected to one end of the second supporting arm (35), and an extension arm (36) is slidably inserted into the other end of the second supporting arm (35) away from the first supporting arm (34); the first electric push rod (38) is arranged between the first supporting arm (34) and the second supporting arm (35), the second electric push rod (39) is fixedly arranged on the outer side of the second supporting arm (35), and the piston rod of the second electric push rod (39) is fixedly connected to the extension arm (36).

6. The coal mining roadway coal seam gas fracturing device according to claim 5, characterized in that: The support mechanism further comprises a third rack (40), a fourth rack (42), a third gear (41) and a pressure sensor (51); the third rack (40) is fixedly arranged on the piston rod of the second electric push rod (39), the fourth rack (42) is slidingly arranged on the second support arm (35), the third gear (41) is rotatably arranged on the second support arm (35), the third rack (40) and the fourth rack (42) are located on the two sides of the third gear (41) and are engaged with the third gear (41); the support plate (6) is rotatably arranged at the lower end of the extension arm (36), the middle part of the support plate (6) is hingedly connected with the extension arm (36), and the pressure sensor (51) is fixedly arranged on one side of the support plate (6).

7. The coal mining roadway coal seam gas fracturing device according to claim 6, characterized in that: The support mechanism further comprises a bidirectional threaded rod (44), a motor (43), a limiting rod (46), a sliding block (45), a connecting rod (47), an arc-shaped sliding rail (48) and an arc-shaped block (49); a front and back horizontal bidirectional threaded rod (44) is rotatably arranged on the upper end of the pump truck body (1) through a fixed frame, the outer side of the bidirectional threaded rod (44) is provided with two thread segments with opposite rotation directions; the motor (43) is fixedly arranged on the fixed frame, the output shaft of the motor (43) is fixedly connected with one end of the bidirectional threaded rod (44), and a front and back horizontal limiting rod (46) is also fixedly arranged on the fixed frame; two sliding blocks (45) are screwed on the outer side of the bidirectional threaded rod (44), the two sliding blocks (45) are respectively screwed on the two thread segments with opposite rotation directions on the outer side of the bidirectional threaded rod (44), and the two sliding blocks (45) are slidingly sleeved on the outer side of the limiting rod (46); a telescopic connecting rod (47) is rotatably arranged on the two sides of each sliding block (45), and an arc-shaped sliding rail (48) is rotatably arranged at the end of the connecting rod (47) away from the sliding block (45); the two ends of the connecting rod (47) are rotatably connected with the sliding block (45) and the arc-shaped sliding rail (48) through ball head structures; an arc-shaped block (49) is fixedly arranged on the outer side of the upper end of each first support arm (34), and the four arc-shaped blocks (49) are slidingly connected in the four arc-shaped sliding rails (48).

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