Automatic geotextile laying device

Abstract

The invention provides an automatic geotechnical cloth laying device, and relates to the field of geotechnical cloth. The automatic geotextile laying device comprises arc-shaped guide rails installed on tunnel construction equipment, a tackle used for moving along the guide rails is installed in the guide rails, the number of the arc-shaped guide rails is two, a telescopic arm fixed relative to the tackle is installed on the tackle, idler wheels are installed at the free end of the telescopic arm, a roller is installed between the two idler wheels, and the roller is connected with the tackle. The winding wheel is used for releasing or winding the geotechnical cloth; according to the automatic laying device for the geotechnical cloth, when the geotechnical cloth is laid, the tackle moves along the arc-shaped guide rail, so that the geotechnical cloth is attached to a tunnel through the rolling wheels and the rollers, nailing and fixing can be carried out in the laying process along with movement of the tackle and rolling of the rolling wheels, automatic laying and nailing are synchronously carried out, manual intervention is reduced, and the construction efficiency is improved; nailing is conducted in the rolling process of the idler wheels, it is guaranteed that fixing points are evenly distributed, local stress concentration is avoided, and the stability of the geotechnical cloth is enhanced.

Description

Technical Field

[0001] The invention relates to the field of geotextiles, in particular to an automatic laying device for geotextiles. Background Art

[0002] Geotextile, also known as geotextile, is a permeable geosynthetics made of synthetic fibers through needle punching or weaving. In tunnel engineering, geotextile, as an important anti-seepage and reinforcement material, is widely used in waterproofing, isolation and stress buffering between tunnel lining and surrounding rock. The traditional laying of geotextile mainly relies on manual operation or semi-automatic mechanical equipment. Workers need to complete the processes of unfolding, positioning and fixing geotextile in the narrow and complex tunnel space.

[0003] When laying geotextiles in tunnels, the traditional method mainly relies on manual operation and simple mechanical equipment. Workers carry the rolled geotextiles to the designated location in the tunnel, and then manually unfold the geotextiles along the longitudinal direction of the tunnel and lay them between the primary support surface and the secondary lining.

[0004] Since manual laying is slow and requires the collaboration of multiple people, labor costs and construction periods are increased. Moreover, when nailing is performed manually, the fixing points are easily unevenly distributed due to the workers' operating proficiency and the environment, resulting in different tensions or pressures on different parts of the geotextile. When the tunnel is deformed by force, the geotextile at the densely populated fixing points will be subjected to greater stress and prone to local tensile damage. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides an automatic geotextile laying device, which solves the problem that collaborative laying by multiple people will increase labor costs and construction period, and the fixing points are prone to uneven distribution when manually nailing.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an automatic geotextile laying device, comprising an arc-shaped guide rail installed on tunnel construction equipment, a pulley for moving along the guide rail installed in the guide rail, the number of the arc-shaped guide rails is two, a telescopic arm fixed relative to the pulley is installed on the pulley, a roller is installed at the free end of the telescopic arm, a drum is installed between the two rollers, and also includes a winding wheel for releasing or winding up the geotextile, the geotextile on the winding wheel is overlapped on the roller and the drum, and the roller and the drum are used to roll along the geotextile.

[0007] A channel is provided inside the roller, and a nail gun is slidably installed in the channel. An outer cover fixed relative to the nail gun is provided on the outer side of the gun mouth of the nail gun, one end of the outer cover extends from one end of the channel, and one end of the gun mouth and one end of the outer cover are in the same horizontal plane. A static contact is installed in the channel, and a moving contact is installed on the nail gun. When the gun mouth moves due to the reaction force of the geotextile, it starts to accumulate force. When the moving contact contacts the static contact, the moving contact, the static contact and the nail gun form a closed circuit, and the nail gun is energized to start nailing.

[0008] Preferably, an elastic sheet is installed between the nail gun and the static contact.

[0009] Preferably, a fixing plate is fixedly installed between the free ends of the two telescopic arms, a hydraulic cylinder is installed on the pulley, and an output end of the hydraulic cylinder is fixed to the fixing plate.

[0010] Preferably, the outer cover is annular, and its outer edge is rounded, and the nozzle of the nail gun is located inside the outer cover.

[0011] Preferably, a sliding ring is fixedly connected to the outer side of the nail gun, and the sliding ring is slidably connected to the channel.

[0012] Preferably, the outer side of the roller is provided with anti-slip textures.

[0013] Preferably, two fixed wheels are installed on the fixed plate, and the roller and the drum are rotatably connected to the fixed wheels. A rotating rod is fixedly connected between the two rollers, and two spiral plates are fixedly connected to the outer side of the rotating rod. A protrusion is slidably installed on the inner side of the spiral plate, and a conductive block is fixedly installed on one end of the protrusion. A slide rail and a cross plate are fixedly connected between the two fixed wheels, and a limited track is slidably installed on the slide rail. The conductive block is used to move along the limited track, and an arc-shaped groove matched with the conductive block is provided at one end of the arc-shaped groove. A conductor A is provided on the outer side of the arc-shaped groove, and several conductors B are installed on the cross plate. The circuits of several conductors B are connected in parallel, and conductor A contacts one of the conductors B. When the conductive block moves into the arc-shaped groove, the static contact, the conductive block, the arc-shaped groove, the conductor A and the conductor B form a closed circuit. At this time, the nail gun is energized and starts working.

[0014] Preferably, balls are rotatably mounted on both ends of the protrusion, and both balls are in contact with the spiral plate.

[0015] Preferably, the sides of the two fixed wheels that are close to each other are slidably connected with sliders, a connecting rod is fixedly connected between the two sliders, the connecting rod is slidably connected to the two protrusions, and two electric push rods are fixedly installed on the cross plate, and the output ends of the two electric push rods are respectively fixedly connected to the two sliders.

[0016] Preferably, the side surfaces of the two sliders that are close to each other are fixedly connected with springs, the other ends of the two springs are respectively fixedly connected with the two protrusions, a dual-axis motor is fixedly installed on the cross plate, the two output ends of the dual-axis motor are fixedly connected with screws, the two screws are respectively rotatably connected with the two fixed wheels, the thread directions of the two screws are opposite, and the two screws are respectively threadedly connected with the two slide rails.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The automatic geotextile laying device, when laying the geotextile, the pulley moves along the arc guide rail, so that the roller and the drum fit the geotextile on the tunnel, and with the movement of the pulley and the rolling of the roller, nailing can be carried out during the laying process. The automatic laying and nailing are carried out simultaneously, which reduces manual intervention, improves construction efficiency, and shortens the construction period. The roller nails during the rolling process to ensure that the fixing points are evenly distributed, avoid local stress concentration, and enhance the stability of the geotextile; through the provision of a moving contact and a static contact, the elastic sheet between the nail gun and the static contact provides an initial preload force to keep the nail gun in a non-triggered state. When the roller rolls until the nail gun is perpendicular to the geotextile, the geotextile The vertical pressure on the gun nozzle and the outer cover is the greatest, so that the nail gun is powered on and the nailing action is triggered. By limiting the triggering at non-vertical angles, it can avoid accidental nailing caused by slight pressure fluctuations or accidental force when the roller rolls, prevent the waste of materials and damage to the geotextile caused by too dense distribution of nails, and ensure that the nailing operation is only carried out in the vertical position where the geotextile needs to be effectively fixed. Nailing perpendicular to the geotextile can make the nails enter the geotextile and the base layer with the largest contact area and the smallest resistance, ensuring that the nails can be firmly embedded, thereby better fixing the geotextile to the tunnel wall, preventing the geotextile from shifting or falling off during subsequent use, and improving the stability and reliability of the geotextile laying. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the pulley, telescopic arm, roller and drum of the present invention;

[0021] Figure 3 A sectional view of a side view of the drum of the present invention;

[0022] Figure 4 is a cross-sectional view of a side view of a rotating rod of the present invention;

[0023] Figure 5 It is a partial structural schematic diagram of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the bump of the present invention;

[0025] Figure 7 It is a schematic diagram of the roller structure of the present invention;

[0026] Figure 8 It is a cross-sectional view of the side view of the roller of the present invention.

[0027] Among them, 1. arc guide rail; 2. pulley; 3. telescopic arm; 4. roller; 5. drum; 6. winding wheel; 7. geotextile; 8. channel; 9. nail gun; 10. outer cover; 11. static contact; 12. moving contact; 13. elastic sheet; 14. fixed plate; 15. hydraulic cylinder; 16. sliding ring; 17. fixed wheel; 18. rotating rod; 19. spiral plate; 20. bump; 21. conductive block; 22. slide rail; 23. cross plate; 24. arc groove; 25. conductor A; 26. conductor B; 27. ball; 28. connecting rod; 29. ​​electric push rod; 30. spring; 31. screw rod; 32. limit track. DETAILED DESCRIPTION

[0028] like Figure 1-Figure 8 As shown, an automatic geotextile laying device includes an arc-shaped guide rail 1 installed on a tunnel construction device, a pulley 2 for moving along the guide rail is installed in the guide rail, the number of the arc-shaped guide rails 1 is two, a telescopic arm 3 fixed relative to the pulley 2 is installed, a fixing plate 14 is fixedly installed between the free ends of the two telescopic arms 3, a hydraulic cylinder 15 is installed on the pulley 2, the output end of the hydraulic cylinder 15 is fixed to the fixing plate 14, a roller 4 is installed at the free end of the telescopic arm 3, the outer side of the roller 4 is provided with an anti-skid pattern, a drum 5 is installed between the two rollers 4, and also includes a winding wheel 6 for releasing or winding up the geotextile 7, the geotextile 7 on the winding wheel 6 is overlapped on the roller 4 and the drum 5, and the roller 4 and the drum 5 are used to roll along the geotextile 7.

[0029] A channel 8 is provided inside the roller 4, and a nail gun 9 is slidably installed in the channel 8. An outer cover 10 fixed relative to the nail gun 9 is provided on the outer side of the gun mouth of the nail gun 9. The outer cover 10 is annular, and its outer edge is rounded. The gun mouth of the nail gun 9 is located in the outer cover 10, and one end of the outer cover 10 extends out from one end of the channel 8. One end of the gun mouth and one end of the outer cover 10 are in the same horizontal plane. A static contact 11 is installed in the channel 8, and an elastic sheet 13 is installed between the nail gun 9 and the static contact 11. When the nail gun 9 moves, the elastic sheet 13 is squeezed, so that the elastic sheet 13 is deformed and starts to accumulate force. A sliding ring 16 is fixedly connected to the outer side of the nail gun 9, and the sliding ring 16 is slidably connected to the channel 8. A moving contact 12 is installed on the gun 9. When the gun mouth moves due to the reaction force of the geotextile 7, it starts to accumulate power. When the moving contact 12 contacts the static contact 11, the moving contact 12, the static contact 11 and the nail gun 9 form a closed circuit, and the nail gun 9 is energized and starts nailing. Two fixed wheels 17 are installed on the fixed plate 14. The roller 4 and the drum 5 are both rotatably connected to the fixed wheel 17. A rotating rod 18 is fixedly connected between the two rollers 4. Two spiral plates 19 are fixedly connected to the outer side of the rotating rod 18. A protrusion 20 is slidably installed on the inner side of the spiral plate 19. A conductive block 21 is fixedly installed at one end of the protrusion 20. A slide rail 22 and a cross plate 23 are fixedly connected between the two fixed wheels 17. A limited position track is slidably installed on the slide rail 22 32, the conductive block 21 is used to move along the limit track 32, one end of the limit track 32 is provided with an arc groove 24 adapted to the conductive block 21, the outer side of the arc groove 24 is provided with a conductor A25, and a plurality of conductive bodies B26 are installed on the cross plate 23, and the circuits of the plurality of conductive bodies B26 are connected in parallel, and the conductive body A25 contacts one of the conductive bodies B26. When the conductive block 21 moves into the arc groove 24, the static contact 11, the conductive block 21, the arc groove 24, the conductive body A25 and the conductive body B26 form a closed circuit. At this time, the nail gun 9 is powered on and starts to work. Balls 27 are rotatably installed at both ends of the protrusion 20, and the two balls 27 are in contact with the spiral plate 19. The two A slider is slidably connected to the side of the fixed wheels 17 that are close to each other, a connecting rod 28 is fixedly connected between the two sliders, the connecting rod 28 is slidably connected to the two protrusions 20, two electric push rods 29 are fixedly installed on the cross plate 23, the output ends of the two electric push rods 29 are respectively fixedly connected to the two sliders, a spring 30 is fixedly connected to the side of the two sliders that are close to each other, the other ends of the two springs 30 are respectively fixedly connected to the two protrusions 20, a dual-axis motor is fixedly installed on the cross plate 23, the two output ends of the dual-axis motor are fixedly connected to screw rods 31, the two screw rods 31 are respectively rotatably connected to the two fixed wheels 17, the thread directions of the two screw rods 31 are opposite, and the two screw rods 31 are respectively threadedly connected to the two slide rails 22.

[0030] Working principle:

[0031] First, the arc guide rail 1 is installed on the tunnel construction equipment. The construction equipment is a trolley device that can move in the tunnel, usually called a tunnel lining trolley or a multi-functional operation trolley. The winding wheel 6 is also installed on the construction equipment through a bracket, and the winding wheel 6 can be connected to an external motor, and the winding or releasing action of the geotextile 7 by the winding wheel 6 is controlled by the external motor; when in use, since the inner wall of the tunnel is in an arc shape, one end of the geotextile 7 can be fixed to the arc edge at one end of the tunnel and fixed, and then the pulley 2 is controlled to move to one end of the arc guide rail 1 This section can be used as the starting position for laying the geotextile 7, and then the fixed plate 14 is controlled to rise by the hydraulic cylinder 15, and the fixed plate 14 drives the free ends of the two telescopic arms 3 to rise, and the drum 5 and the two rollers 4 are pressed against the geotextile 7, and the geotextile 7 is fitted with the concrete layer of the tunnel, and then the pulley 2 moves along the arc track. Since the outer sides of the two rollers 4 are provided with anti-slip patterns, the friction between them and the geotextile 7 can be increased, so that the two rollers 4 can roll along the geotextile 7. When the two rollers 4 roll along the geotextile 7, the two rollers 5 also move along As the geotextile 7 rolls, it should be noted that the two rollers 4 should be pressed on the two edges of the geotextile 7, and the drum 5 should be pressed on the middle position of the geotextile 7, so that in the process of the rollers 4 rolling along the geotextile 7, the rollers 4 cooperate with the drum 5 to achieve continuous and smooth paving; when the rollers 4 roll along the edges of the geotextile 7, due to the friction generated by the anti-slip texture, the rollers 4 drive the geotextile 7 to move forward, forming an active traction effect, and at the same time, the drum 5 located in the middle of the geotextile 7 tightly fits the geotextile 7 to the surface of the tunnel concrete layer, ensuring smooth paving without slipping. The two rollers 4 and the drum 5 form a triangular force-bearing structure, which reduces the laying resistance by means of rolling friction, so that the geotextile 7 always maintains a uniform tension state during the movement of the pulley 2; the fixed plate 14 driven by the hydraulic cylinder 15 can adjust the height of the telescopic arm 3 in real time to adapt to the curvature change of the inner wall of the tunnel. When the tunnel section appears locally uneven, the telescopic arm 3 can automatically retract through the hydraulic feedback system to ensure that the rollers 4 and the drum 5 are always in close contact with the concrete surface, maintain a constant laying pressure, and avoid hollowing or damage of the geotextile 7 due to uneven pressure;

[0032] In the first embodiment, a channel 8 is provided inside the roller 4, and a nail gun 9 is slidably installed in the channel 8. One end of an outer cover 10 outside the nozzle of the nail gun 9 extends out from the channel 8, and one end of the nozzle and one end of the outer cover 10 are in the same horizontal plane. When the roller 4 rolls along the geotextile 7, the outer cover 10 on the nail gun 9 is subjected to the reaction force of the geotextile 7 and drives the nail gun 9 to move along the channel 8. The nail gun 9 squeezes the elastic sheet 13 to deform it and store force. When the moving contact 12 moves with the nail gun 9 and contacts the static contact 11, the moving contact 12, the static contact 11 and the nail gun 9 form a closed circuit, and the nail gun 9 is energized and nails are driven. When the roller 4 rolls, the nail gun 9 inside it will trigger a nailing according to the rolling distance of the roller 4, that is, each time the roller 4 rolls one circle, the nailing will be triggered, so The roller 4 rolls at a constant speed along the geotextile 7, so the nail gun 9 can nail on the geotextile 7 at the same interval; it should be noted that the channel 8 and the static contact 11 inside the roller 4 play a guiding and stroke limiting role for the nail gun 9. When the nail gun 9 slides along the channel 8 under force, the sliding ring 16 can prevent it from deviating, ensuring that the nail gun 9 can only move in a straight line in the channel 8; the elastic sheet 13 between the nail gun 9 and the static contact 11 provides an initial preload force to keep the nail gun 9 in a non-triggered state. When the roller 4 rolls until the nail gun 9 is perpendicular to the geotextile 7, the vertical pressure of the geotextile 7 on the gun nozzle and the outer cover 10 is the largest. According to the principle of force decomposition, the vertical pressure directly acts on the axial direction of the nail gun 9. At this time, all the pressure is used to overcome the preload force of the elastic sheet 13 , pushing the nail gun 9 to slide along the channel 8, and at a non-vertical angle, part of the pressure will be decomposed into a component force along the rolling direction of the roller 4, resulting in insufficient effective pressure to push the nail gun 9 to slide, and it is impossible to make it reach the maximum stroke. It should be noted that if the nail gun 9 can be easily triggered at a non-vertical angle, nailing may be performed before the geotextile 7 is completely attached to the tunnel wall, resulting in the nails being loosely fixed or shifted in position; by limiting the triggering of non-vertical angles, it is possible to avoid accidental nailing caused by slight pressure fluctuations or accidental force when the roller 4 rolls, prevent the waste of materials and damage to the geotextile 7 caused by too dense distribution of nails, and ensure that the nailing operation is only performed at the vertical position where the geotextile 7 needs to be effectively fixed. Nailing perpendicular to the geotextile 7 can make the nails with the maximum contact The contact area and minimum resistance enter the geotextile 7 and the base layer, ensuring that the nails can be firmly embedded, so as to better fix the geotextile 7 on the tunnel wall, prevent the geotextile 7 from shifting or falling off during subsequent use, and improve the stability and reliability of the laying of the geotextile 7; in summary, when laying the geotextile 7, the pulley 2 moves along the arc guide rail 1, so that the roller 4 and the drum 5 fit the geotextile 7 on the tunnel, and with the movement of the pulley 2 and the rolling of the roller 4, it can be nailed and fixed during the laying process. Automated laying and nailing are carried out simultaneously, reducing manual intervention, improving construction efficiency, shortening construction period, and the roller 4 nails during the rolling process to ensure that the fixing points are evenly distributed, avoid local stress concentration, and enhance the stability of the geotextile 7.

[0033] In the second embodiment, the roller 4 and the roller 5 are rotatably connected with the fixed plate 14 through the fixed wheel 17, and the protrusion 20 is slidably installed on the inner side of the spiral plate 19 fixed on the outer side of the rotating rod 18. The conductive block 21 at one end of the protrusion 20 can move along the limiting track 32. When the roller 4 rolls and drives the rotating rod 18 to rotate, the spiral plate 19 pushes the protrusion 20 and the conductive block 21 to move. An arc groove 24 and a conductor A are provided at one end of the limiting track 32. A plurality of parallel conductors B are installed on the horizontal plate 23. When the conductive block 21 moves When the roller 4 rotates, it drives the rotating rod 18 to rotate, the rotating rod 18 drives the spiral plate 19 to rotate, and the spiral plate 19 drives the ball 27, the protrusion 20 and the conductive block 21 to move. The ball 27 can reduce the friction between the spiral plate 19 and the conductive block 21, which is conducive to the movement of the conductive block 21 along the limit track 32. When the nail gun 9 starts to rotate one circle when nailing, the spiral plate 19 drives the protrusion 20 to move. At this time, the conductive block 21 moves to the position of the arc groove 24. In this process, the electric push rod 29 applies a force close to the limit track 32 to the slider. The slider drives the protrusion 20 to drop through the connecting rod 28. At this time, the roller 4 can stop moving, the protrusion 20 is separated from the spiral plate 19, and the conductive block 21 starts to insert into the arc groove 24. At this time, the static contact 11, the conductive block 21, the arc groove 24, the conductor A25 and the others A conductor B26 forms a closed circuit, so that when the moving contact 12 contacts the static contact 11 again, the nail gun 9 can be powered on and nail. After nailing is completed, the double-axis motor drives the screw rod 31 to rotate, the screw rod 31 drives the arc track to move, and the arc track drives the conductive block 21 to move in the direction close to the slider, and then the electric push rod 29 controls the conductive block 21 and the protrusion 20 to return to their original positions. The function of the spring 30 is to ensure that when the protrusion 20 is not subjected to force, the slider and the protrusion 20 maintain the initial distance;Then the screw rod 31 is reversed to restore the limit track 32 to its original position. It should be noted that several conductors B26 are connected to the external power supply through wires, each wire can be installed with a relay, and each conductor is connected to the conductor A25 through a wire. By turning on one of the relays, one of the conductors is energized, and then the other relays are turned off, and a parallel circuit is formed between several conductors B26. The initial position of the limit track 32 can be controlled by the screw rod 31, and then the initial position of the conductor A25 can be controlled, so that the initial position of the conductor A25 contacts any conductor B26, and the roller 4 is used to rotate to drive the rotating rod 18 and the spiral plate 19 to rotate synchronously, and the spiral plate 19 is rotated. The pitch and rotation angle of the spiral plate 19 are directly related to the displacement of the protrusion 20 and the conductive block 21. By setting the pitch and structural parameters of the spiral plate 19, the spiral plate 19 just pushes the protrusion 20 and the conductive block 21 to the position of the arc groove 24 of the limit track 32 every time the roller 4 rotates N circles, so that nailing can be achieved once every time the roller 4 rotates N circles. The dual-axis motor drives the screw 31 to rotate, driving the limit track 32 including the arc groove 24 and the conductor A to move, thereby changing the initial position of the conductive block 21 triggering nailing. By adjusting the rotation angle of the screw 31, the corresponding relationship between the number of rotations of the roller 4 and the nailing action can be accurately controlled to meet the nailing density requirements in different construction scenarios. ;

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic geotextile laying device, comprising an arc-shaped guide rail (1) installed on a tunnel construction device, a pulley (2) for moving along the guide rail installed in the guide rail, characterized in that: The number of the arc-shaped guide rails (1) is two, the pulley (2) is provided with a telescopic arm (3) fixed relative thereto, a roller (4) is provided at the free end of the telescopic arm (3), a drum (5) is provided between the two rollers (4), and a reel (6) for releasing or reeling in the geotextile (7) is also provided, the geotextile (7) on the reel (6) is overlapped on the roller (4) and the drum (5), and the roller (4) and the drum (5) are used to roll along the geotextile (7); A channel (8) is provided inside the roller (4), a nail gun (9) is slidably installed in the channel (8), an outer cover (10) fixed relative to the nail gun (9) is provided outside the gun mouth of the nail gun (9), one end of the outer cover (10) extends from one end of the channel (8), one end of the gun mouth and one end of the outer cover (10) are in the same horizontal plane, a static contact (11) is installed in the channel (8), a moving contact (12) is installed on the nail gun (9), when the gun mouth moves due to the reaction force of the geotextile (7), it starts to accumulate power, when the moving contact (12) contacts the static contact (11), the moving contact (12), the static contact (11) and the nail gun (9) form a closed circuit, the nail gun (9) is energized and nailing is performed.

2. The automatic geotextile laying device according to claim 1, characterized in that: An elastic sheet (13) is installed between the nail gun (9) and the static contact (11).

3. The automatic geotextile laying device according to claim 1, characterized in that: A fixing plate (14) is fixedly installed between the free ends of the two telescopic arms (3), a hydraulic cylinder (15) is installed on the pulley (2), and the output end of the hydraulic cylinder (15) is fixed to the fixing plate (14).

4. The automatic geotextile laying device according to claim 1, characterized in that: The outer cover (10) is annular, and its outer edge is rounded. The gun nozzle of the nail gun (9) is located inside the outer cover (10).

5. The automatic geotextile laying device according to claim 1, characterized in that: A sliding ring (16) is fixedly connected to the outer side of the nail gun (9), and the sliding ring (16) is slidably connected to the channel (8).

6. The automatic geotextile laying device according to claim 3, characterized in that: The outer side of the roller (4) is provided with anti-skid patterns.

7. The automatic geotextile laying device according to claim 3, characterized in that: Two fixed wheels (17) are installed on the fixed plate (14), the roller (4) and the drum (5) are both rotatably connected to the fixed wheels (17), a rotating rod (18) is fixedly connected between the two rollers (4), two spiral plates (19) are fixedly connected to the outer side of the rotating rod (18), a protrusion (20) is slidably installed on the inner side of the spiral plate (19), a conductive block (21) is fixedly installed at one end of the protrusion (20), a slide rail (22) and a cross plate (23) are fixedly connected between the two fixed wheels (17), a limit track (32) is slidably installed on the slide rail (22), and the conductive block (21) is used to move along the limit track (32) One end of the limit track (32) is provided with an arc-shaped groove (24) adapted to the conductive block (21), and a conductor A (25) is provided on the outer side of the arc-shaped groove (24). A plurality of conductors B (26) are installed on the horizontal plate (23), and the circuits of the plurality of conductors B (26) are connected in parallel. The conductor A (25) contacts one of the conductors B (26). When the conductive block (21) moves into the arc-shaped groove (24), the stationary contact (11), the conductive block (21), the arc-shaped groove (24), the conductor A (25) and the conductor B (26) form a closed circuit. At this time, the nail gun (9) is powered on and starts to work.

8. The automatic geotextile laying device according to claim 7, characterized in that: Balls (27) are rotatably mounted on both ends of the protrusion (20), and both balls (27) are in contact with the spiral plate (19).

9. The automatic geotextile laying device according to claim 7, characterized in that: A slider is slidably connected to the side surfaces of the two fixed wheels (17) that are close to each other, a connecting rod (28) is fixedly connected between the two sliders, the connecting rod (28) is slidably connected to the two protrusions (20), and two electric push rods (29) are fixedly installed on the cross plate (23), and the output ends of the two electric push rods (29) are fixedly connected to the two sliders respectively.

10. The automatic geotextile laying device according to claim 9, characterized in that: A spring (30) is fixedly connected to the side surfaces of the two sliders that are close to each other, and the other ends of the two springs (30) are respectively fixedly connected to the two protrusions (20). A double-axis motor is fixedly mounted on the transverse plate (23), and two output ends of the double-axis motor are fixedly connected to screw rods (31). The two screw rods (31) are respectively rotatably connected to the two fixed wheels (17), and the thread directions of the two screw rods (31) are opposite. The two screw rods (31) are respectively threadedly connected to the two slide rails (22).

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