Concrete spraying device for tunnel construction

Abstract

The invention belongs to the technical field of concrete spraying devices, and particularly relates to a concrete spraying device for tunnel construction, which comprises a concrete pressurizing assembly and a working vehicle, the concrete pressurizing assembly is arranged on the working vehicle, and the concrete pressurizing assembly comprises a concrete hopper, a pressurizing pump assembly, a driving assembly and a pressure stabilizing device. The flywheel of the driving assembly rotates to drive the booster pump assembly to pump concrete into the pressure stabilizing tank of the pressure stabilizing device, part of kinetic energy of the concrete is converted into elastic potential energy of a pressure stabilizing plate spring through a pressure stabilizing plate in a pressure changing cylinder in the pressure stabilizing device, and the maximum pressure value is reduced under the pressure increasing and decreasing of original sine curve changes; and meanwhile, the increasing and decreasing effect of the pressure stabilizing device is adjusted through an adjusting valve of the pressure stabilizing device, and the problem that the material rebound rate is increased due to the fact that the concrete spraying pressure is not stable is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete spraying devices, and in particular relates to a concrete spraying device for tunnel construction. Background Art

[0002] Shotcrete is a construction method that uses a pressure spray gun to spray and pour fine stone concrete. It is often used to pour tunnel linings, walls, ceilings and other thin-walled structures or other structural linings as well as protective layers of steel structures. During tunnel construction, wet concrete sprayers are often used.

[0003] Wet concrete spraying machines mostly use a pumping method. The crank mechanism drives the two main cylinders to move alternately, driving their respective piston cylinders to pump out concrete periodically. The piston moves in a straight line and presents a sinusoidal motion. When the angular velocity is fixed, the linear velocity of the piston at both ends changes very little. At this time, the pressure change trend is slow, resulting in unstable pressure of concrete spraying, which in turn increases the material rebound rate. In addition, the pulsating change of the pumping pressure will also impose alternating loads on vulnerable parts such as concrete delivery pipes, reducing the service life of vulnerable parts. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a concrete spraying device for tunnel construction, in which the flywheel at the bottom of the motor shaft is driven to rotate by the driving motor of the driving assembly, and the push rod at the bottom of the flywheel drives the piston assembly of the booster pump assembly to move. During the process, the push rod periodically pushes the right piston rod and the left piston rod to move, and then pumps the concrete into the pressure stabilizing tank of the pressure stabilizing device. The pressure inside the pressure stabilizing tank gradually increases and then gradually decreases as the flywheel rotates. When the pressure inside the pressure stabilizing tank gradually increases, it pushes the pressure stabilizing plate in the transformer cylinder to move up, and the pressure stabilizing plate spring is compressed, thereby Part of the kinetic energy of the concrete is converted into the elastic potential energy of the pressure stabilizing plate spring and stored in the process of the internal pressure of the pressure stabilizing tank gradually decreasing. The pressure stabilizing plate spring pushes the pressure stabilizing plate downward, and the elastic potential energy of the pressure stabilizing plate spring is converted into the kinetic energy of the concrete. At the same time, there will be a short vacuum period when the push rod rotates from the right rod groove of the right piston rod to the left rod groove of the left piston rod, leaving time for the pressure stabilizing plate to rebound. Under the original sinusoidal increase and decrease pressure, the maximum pressure value is reduced and the minimum pressure value is increased. At the same time, the increasing and decreasing effect of the pressure stabilizing device is adjusted through the regulating valve of the pressure stabilizing device to cope with concrete of different viscosities, effectively solving the above problems.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes a concrete spraying device for tunnel construction, comprising a concrete boosting assembly and a work vehicle, wherein the concrete boosting assembly is arranged on the work vehicle, the concrete boosting assembly comprises a concrete hopper, a boosting pump assembly, a driving assembly and a pressure stabilizing device, the pressure stabilizing device is fixed on the work vehicle, the boosting pump assembly is arranged on the pressure stabilizing device, the concrete hopper is arranged on the top of the boosting pump assembly, and the driving assembly is arranged on the side wall of the concrete hopper; The bottom of the concrete hopper is provided with an arc groove and an auger groove, the upper part of the concrete hopper is provided with a material distribution net, the auger groove is provided with an auger, the end of the auger is provided with an auger drive wheel, the auger drive wheel is located outside the concrete hopper, and both ends of the bottom of the arc groove are provided with a feed pipe, and a one-way valve is provided in the feed pipe; The booster pump assembly includes a booster pump tank and a piston assembly. The piston assembly is arranged in the booster pump tank. The booster pump tank is arranged at the bottom of the feed pipe. The two feed pipes are respectively located at the two ends of the top of the booster pump tank. A piston rod slide groove is provided at the center of the tank wall on the rear side of the booster pump tank.

[0006] Furthermore, the piston assembly is provided with two piston plates, which slide in the booster pump tank. The two piston plates are respectively provided with a right piston rod and a left piston rod. A piston spring is provided between the two piston plates. The right piston rod and the left piston rod slide on the piston rod slide groove. The right piston rod is provided on the upper side of the left piston rod. A right rod groove is provided on the outer side of the right piston rod, and a left rod groove is provided on the inner side of the left piston rod.

[0007] Furthermore, the drive assembly includes a drive motor and a gear transmission component. The drive motor is fixed on the side wall of the concrete hopper. A motor shaft is provided at the bottom of the drive motor. A motor bevel gear is provided on the motor shaft. A flywheel is provided at the bottom of the motor shaft. A push rod is provided at the edge of the bottom surface of the flywheel. The flywheel is arranged above the right piston rod. When the flywheel rotates, the push rod is periodically alternately located in the right rod groove or the left rod groove.

[0008] Furthermore, the gear transmission component rotates at the bottom of the auger groove, a main transmission wheel is provided at the front end of the gear transmission component, a transmission bevel gear is provided on the main transmission wheel, the main transmission wheel is connected to the auger transmission wheel through a transmission belt, and the transmission bevel gear is meshed with the motor bevel gear.

[0009] Furthermore, the pressure stabilizing device includes a pressure stabilizing tank and a pressure transformer cylinder. Feed pipes are provided at both ends of the front side of the pressure stabilizing tank, and the feed pipes are respectively connected to the two ends of the bottom of the booster pump tank. The pressure transformer cylinder is arranged at the top of the rear side of the pressure stabilizing tank, and a booster discharge pipe is provided at the bottom of the pressure stabilizing tank.

[0010] Furthermore, a shaft sleeve sliding cylinder is provided on the top of the transformer cylinder, a scale groove is provided on the shaft sleeve sliding cylinder, a voltage stabilizing plate is provided inside the transformer cylinder, a voltage stabilizing plate spring is provided on the top of the voltage stabilizing plate, the end of the voltage stabilizing plate spring is provided on the top wall of the transformer cylinder, and the voltage stabilizing plate is slidably arranged in the transformer cylinder.

[0011] Furthermore, a pressure stabilizing plate threaded sleeve is also provided on the pressure stabilizing plate, and the pressure stabilizing plate threaded sleeve is located at the center of the pressure stabilizing plate spring. The pressure stabilizing plate threaded sleeve is slidably arranged in a sleeve sliding cylinder, and a regulating valve is provided on the sleeve sliding cylinder. A threaded rod is provided at the bottom of the regulating valve, and the threaded rod is threadedly connected to the pressure stabilizing plate threaded sleeve.

[0012] Furthermore, a control room and a spray control arm are provided on the front side of the work vehicle. The spray control arm is located on the left side of the control room. A concrete spray hose is provided on the spray control arm. A concrete nozzle is provided at the front end of the spray control arm. One end of the concrete spray hose is connected to the pressurized discharge pipe, and the other end of the concrete spray hose is connected to the concrete nozzle.

[0013] The beneficial effects achieved by the present invention using the above structure are as follows: 1. The material distribution net of the concrete hopper can block oversized aggregates and prevent them from clogging the pipe or the one-way valve. Because the viscosity of concrete is high and the fluidity is poor, the auger of the concrete hopper pushes the concrete into the arc groove while stirring the concrete, preventing the booster pump tank from sucking empty and affecting the booster pump tank's pressurization when spraying concrete.

[0014] 2. The driving motor drives the flywheel at the bottom of the motor shaft to rotate. When the push rod at the bottom of the flywheel enters the right rod groove, the push rod will push the right piston rod to move right. As the push rod rotates to a position close to the left rod groove, it will disengage from the right rod groove and enter the left rod groove, thereby driving the left piston rod to move left, thereby achieving the technical effect that the push rod on the flywheel alternately pushes the right piston rod and the left piston rod, thereby achieving the purpose of the booster pump assembly to pressurize the concrete.

[0015] 3. As the flywheel rotates, the push rod is in the right rod groove, driving the right rod groove to move toward the left rod groove. The right piston rod will push the piston plate connected to it to move, and the piston plate will squeeze the concrete on its side and pump the concrete into the pressure-stabilizing tank. When the push rod rotates to the position closest to the booster pump tank, the piston plate moves at the maximum speed and the pressure pumped to the pressure-stabilizing tank is the maximum. At this time, the increased internal pressure of the pressure-stabilizing tank will push the pressure-stabilizing plate upward, increasing the volume of the pressure-stabilizing tank, thereby reducing the excessive and rapid changes in the internal pressure of the pressure-stabilizing tank, that is, converting part of the kinetic energy of the concrete into the elastic potential energy of the pressure-stabilizing plate spring; as the push rod gradually pushes the right rod groove close to the left rod groove, when the push rod slides out of the right rod groove, the right rod groove has not moved to the end closest to the left rod groove, and the acceleration of the piston plate movement at this time is not zero, that is, The piston plate on the right piston rod side still has pumping pressure, and at the same time, the pressure of the concrete pumped by the booster pump tank decreases, so that the pressure stabilizing plate spring pushes the pressure stabilizing plate downward to stabilize the internal pressure of the pressure stabilizing tank, that is, converts the elastic potential energy of the pressure stabilizing plate spring into the kinetic energy of concrete; there is a certain time difference in the process from the push rod sliding out of the right rod groove to the push rod turning into the left rod groove and pushing the left rod groove to move. This short period of time is the process of the pressure stabilizing plate spring pushing the pressure stabilizing plate downward. At this time, the pressure of the concrete discharged by the booster discharge pipe is the pressure given by the pressure stabilizing plate. Under the original sinusoidal increase and decrease pressure, the maximum pressure value is reduced and the minimum pressure value is increased, thereby achieving the technical effect of improving the stability of the concrete injection pressure. At the same time, when the pressure increases next time, the pressure stabilizing plate has space to move up, otherwise the pressure stabilizing plate will lose the pressure stabilizing effect.

[0016] 4. Different types of concrete have different mixing ratios and different viscosities after mixing. By turning the regulating valve, the threaded rod at the bottom of the regulating valve drives the pressure stabilizing plate to move up and down, thereby adjusting the initial pressure of the pressure stabilizing plate spring and the volume of the pressure stabilizing tank. Under the fixed power of the driving motor, the volume of the pumped concrete remains unchanged, the volume of the pressure stabilizing tank increases, and the maximum and minimum values ​​of the internal pressure of the pressure stabilizing tank decrease. Conversely, the maximum and minimum values ​​of the internal pressure of the pressure stabilizing tank are increased, thereby achieving the technical effect of adjusting the injection pressure of the concrete nozzle according to the concrete of different viscosities, thereby reducing the rebound rate of the concrete material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of a concrete spraying device for tunnel construction proposed by the present invention; Figure 2 A three-dimensional diagram of a concrete pressurizing assembly of a concrete spraying device for tunnel construction proposed by the present invention; Figure 3 This is a front view of a concrete pressurizing assembly of a concrete spraying device for tunnel construction proposed by the present invention; Figure 4 for Figure 3 A cross-sectional view along the cutting line AA; Figure 5 for Figure 3 A cross-sectional view along the cutting line BB; Figure 6 for Figure 4 A cross-sectional view along the cutting line CC; Figure 7 This is a schematic structural diagram of a piston assembly of a concrete spraying device for tunnel construction proposed by the present invention; Figure 8 for Figure 4 A partial enlarged view of point Ⅰ in the middle; Fig. 9 for Figure 5 A partial enlarged view of point II in the middle.

[0018] Among them, 1. Concrete booster assembly, 2. Work vehicle, 21. Control room, 22. Spray control arm, 23. Concrete spray hose, 24. Concrete nozzle, 3. Concrete hopper, 31. Arc trough, 32. Auger trough, 33. Material distribution net, 34. Auger, 341. Auger drive wheel, 35. Feed pipe, 4. Booster pump assembly, 41. Booster pump tank, 411. Piston rod slide, 42. Piston assembly, 421. Right piston rod, 4211. Right rod groove, 422. Left piston rod, 4221. Left rod groove, 423 , piston spring, 5, drive assembly, 51, drive motor, 52, motor shaft, 521, motor bevel gear, 522, flywheel, 523, push rod, 53, gear transmission, 531, transmission bevel gear, 532, main drive wheel, 6, pressure stabilizing device, 61, pressure stabilizing tank, 611, feed pipe, 612, booster discharge pipe, 62, transformer cylinder, 621, sleeve sliding cylinder, 622, scale groove, 63, pressure stabilizing plate, 631, pressure stabilizing plate threaded sleeve, 632, pressure stabilizing plate spring, 64, regulating valve, 641, threaded rod.

[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0022] like Figure 1-Figure 9 As shown, the present invention proposes a concrete spraying device for tunnel construction, comprising a concrete boosting assembly 1 and a working vehicle 2, wherein the concrete boosting assembly 1 is arranged on the working vehicle 2, the concrete boosting assembly 1 comprises a concrete hopper 3, a boosting pump assembly 4, a driving assembly 5 and a pressure stabilizing device 6, the pressure stabilizing device 6 is fixed on the working vehicle 2, the boosting pump assembly 4 is arranged on the pressure stabilizing device 6, the concrete hopper 3 is arranged on the top of the boosting pump assembly 4, and the driving assembly 5 is arranged on the side wall of the concrete hopper 3; The concrete hopper 3 is provided with an arc groove 31 and an auger groove 32 at the bottom, a material distribution net 33 is provided above the interior of the concrete hopper 3, an auger 34 is provided in the auger groove 32, an auger drive wheel 341 is provided at the end of the auger 34, and the auger drive wheel 341 is located outside the concrete hopper 3, and a discharge pipe 35 is provided at both ends of the bottom of the arc groove 31, and a one-way valve is provided in the discharge pipe 35; The boost pump assembly 4 includes a boost pump tank 41 and a piston assembly 42. The piston assembly 42 is arranged in the boost pump tank 41. The boost pump tank 41 is arranged at the bottom of the feed pipe 35. The two feed pipes 35 are respectively located at the two ends of the top of the boost pump tank 41. A piston rod slide groove 411 is provided at the center of the tank wall on the rear side of the boost pump tank 41.

[0023] The piston assembly 42 is provided with two piston plates, which slide in the booster pump tank 41. The two piston plates are respectively provided with a right piston rod 421 and a left piston rod 422. A piston spring 423 is provided between the two piston plates. The right piston rod 421 and the left piston rod 422 slide on the piston rod slide groove 411. The right piston rod 421 is arranged on the upper side of the left piston rod 422. A right rod groove 4211 is provided on the outer side of the right piston rod 421, and a left rod groove 4221 is provided on the inner side of the left piston rod 422.

[0024] The driving assembly 5 includes a driving motor 51 and a gear transmission member 53. The driving motor 51 is fixed on the side wall of the concrete hopper 3. A motor shaft 52 is provided at the bottom of the driving motor 51. A motor bevel gear 521 is provided on the motor shaft 52. A flywheel 522 is provided at the bottom of the motor shaft 52. A push rod 523 is provided at the bottom edge of the flywheel 522. The flywheel 522 is arranged above the right piston rod 421. When the flywheel 522 rotates, the push rod 523 is periodically and alternately located in the right rod groove 4211 or the left rod groove 4221.

[0025] The gear transmission member 53 rotates at the bottom of the auger groove 32. A main transmission wheel 532 is provided at the front end of the gear transmission member 53. A transmission bevel gear 531 is provided on the main transmission wheel 532. The main transmission wheel 532 is connected to the auger transmission wheel 341 through a transmission belt. The transmission bevel gear 531 is meshed with the motor bevel gear 521.

[0026] The pressure stabilizing device 6 includes a pressure stabilizing tank 61 and a pressure transformer cylinder 62. Feed pipes 611 are provided at both ends of the front side of the pressure stabilizing tank 61. The feed pipes 611 are respectively connected to the two ends of the bottom of the booster pump tank 41. The pressure transformer cylinder 62 is arranged at the top of the rear side of the pressure stabilizing tank 61. A booster discharge pipe 612 is provided at the bottom of the pressure stabilizing tank 61.

[0027] A shaft sleeve sliding cylinder 621 is provided on the top of the transformer cylinder 62, a scale groove 622 is provided on the shaft sleeve sliding cylinder 621, a voltage stabilizing plate 63 is provided inside the transformer cylinder 62, a voltage stabilizing plate spring 632 is provided on the top of the voltage stabilizing plate 63, the end of the voltage stabilizing plate spring 632 is provided on the top wall of the transformer cylinder 62, and the voltage stabilizing plate 63 is slidably set in the transformer cylinder 62.

[0028] A voltage stabilizing plate threaded sleeve 631 is also provided on the voltage stabilizing plate 63. The voltage stabilizing plate threaded sleeve 631 is located at the center of the voltage stabilizing plate spring 632. The voltage stabilizing plate threaded sleeve 631 is slidably set in the sleeve sliding cylinder 621. A regulating valve 64 is provided on the sleeve sliding cylinder 621. A threaded rod 641 is provided at the bottom of the regulating valve 64. The threaded rod 641 is threadedly connected to the voltage stabilizing plate threaded sleeve 631.

[0029] A control room 21 and a spray control arm 22 are provided on the front side of the work vehicle 2. The spray control arm 22 is located on the left side of the control room 21. A concrete spray hose 23 is provided on the spray control arm 22. A concrete nozzle 24 is provided at the front end of the spray control arm 22. One end of the concrete spray hose 23 is connected to the pressurized discharge pipe 612, and the other end of the concrete spray hose 23 is connected to the concrete nozzle 24.

[0030] During specific use, the working vehicle 2 is driven into the tunnel, the concrete mixer truck injects concrete into the concrete hopper 3, the driving motor 51 drives the motor shaft 52 to rotate, the motor bevel gear 521 on the motor shaft 52 drives the gear transmission member 53 to rotate, the main drive wheel 532 of the gear transmission member 53 drives the auger 34 to rotate through the transmission belt, the auger 34 stirs the concrete in the concrete hopper 3, and at the same time pushes the concrete into the arc groove 31.

[0031] During the rotation of the motor shaft 52, the flywheel 522 at the bottom thereof is driven to rotate, and the flywheel 522 drives the push rod 523 of the bottom plate to rotate. When the push rod 523 is in the right rod groove 4211 and drives the right rod groove 4211 to move toward the left rod groove 4221 on the right side, the right piston rod 421 will push the right piston plate to move, and the piston plate will squeeze the concrete inside the right side of the booster pump tank 41, and the concrete will enter the pressure stabilizing tank 61 through the feed pipe 611. At the same time, the piston spring 423 is stretched, and as the push rod 523 gradually pushes the right rod groove 4211 close to the left rod groove 4221, when the push rod 523 slides out of the right rod groove 4211, the pressure inside the pressure stabilizing tank 61 gradually increases and then gradually decreases. When the pressure inside the pressure stabilizing tank 61 gradually increases, the pressure stabilizing plate 63 in the transformer cylinder 62 is pushed upward, and the pressure stabilizing plate spring 632 is compressed, thereby converting part of the kinetic energy of the concrete into the elastic potential energy of the pressure stabilizing plate spring 632. When the pressure inside the pressure stabilizing tank 61 gradually decreases, the pressure stabilizing plate spring 632 pushes the pressure stabilizing plate 63 downward, and the elastic potential energy of the pressure stabilizing plate spring 632 is converted into the kinetic energy of the concrete.

[0032] As the push rod 523 slides out of the right rod groove 4211, the right piston plate moves to the left under the drive of the piston spring 423, the one-way valve of the right discharge pipe 35 of the booster pump tank 41 opens, and concrete enters the booster pump tank 41. When the push rod 523 pushes the right piston rod 421 to move next time, as the flywheel 522 rotates, the push rod 523 is driven to rotate into the left rod groove 4221, and the left rod groove 4221 is pushed to move to the left, and then the above process is repeated, and the concrete inside the pressure-stabilizing tank 61 flows into the concrete injection hose 23 from the booster discharge pipe 612, and then is sprayed from the concrete nozzle 24 at the end of the concrete injection hose 23. Towards the tunnel wall, observe the rebound and fall of materials when concrete is sprayed, and by rotating the regulating valve 64, the threaded rod 641 at the bottom of the regulating valve 64 drives the pressure stabilizing plate 63 to move up and down, thereby adjusting the initial pressure of the pressure stabilizing plate spring 632, and at the same time adjusting the volume of the pressure stabilizing tank 61. Under the fixed power of the driving motor 51, the volume of the pumped concrete remains unchanged, the volume of the pressure stabilizing tank 61 increases, and the maximum and minimum values ​​of the internal pressure of the pressure stabilizing tank 61 decrease. Conversely, the maximum and minimum values ​​of the internal pressure of the pressure stabilizing tank 61 are increased, thereby adjusting the injection pressure of the concrete nozzle 24 to reduce the rebound and fall of the concrete material to a minimum.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

[0035] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A concrete spraying device for tunnel construction, characterized in that: The concrete pressurizing assembly (1) comprises a concrete hopper (3), a pressure-boosting pump assembly (4), a driving assembly (5) and a pressure-stabilizing device (6); the pressure-stabilizing device (6) is fixed to the work vehicle (2); the pressure-boosting pump assembly (4) is arranged on the pressure-stabilizing device (6); the concrete hopper (3) is arranged on the top of the pressure-boosting pump assembly (4); and the driving assembly (5) is arranged on the side wall of the concrete hopper (3); The concrete hopper (3) is provided with an arc-shaped groove (31) and an auger groove (32) at the bottom, a material distribution net (33) is provided above the interior of the concrete hopper (3), an auger (34) is provided in the auger groove (32), an auger drive wheel (341) is provided at the end of the auger (34), and the auger drive wheel (341) is located outside the concrete hopper (3), and discharge pipes (35) are provided at both ends of the bottom of the arc-shaped groove (31), and a one-way valve is provided in the discharge pipe (35); The booster pump assembly (4) comprises a booster pump tank (41) and a piston assembly (42), wherein the piston assembly (42) is arranged in the booster pump tank (41), the booster pump tank (41) is arranged at the bottom of a feed pipe (35), the two feed pipes (35) are respectively located at two ends of the top of the booster pump tank (41), and a piston rod slide groove (411) is provided at the center of the tank wall on the rear side of the booster pump tank (41).

2. A concrete spraying device for tunnel construction according to claim 1, characterized in that: The piston assembly (42) is provided with two piston plates, which slide in the booster pump tank (41). The two piston plates are respectively provided with a right piston rod (421) and a left piston rod (422). A piston spring (423) is provided between the two piston plates. The right piston rod (421) and the left piston rod (422) slide on the piston rod slide groove (411). The right piston rod (421) is provided on the upper side of the left piston rod (422). A right rod groove (4211) is provided on the outer side of the right piston rod (421), and a left rod groove (4221) is provided on the inner side of the left piston rod (422).

3. A concrete spraying device for tunnel construction according to claim 2, characterized in that: The driving assembly (5) comprises a driving motor (51) and a gear transmission member (53); the driving motor (51) is fixed on the side wall of the concrete hopper (3); a motor shaft (52) is provided at the bottom of the driving motor (51); a motor bevel gear (521) is provided on the motor shaft (52); a flywheel (522) is provided at the bottom of the motor shaft (52); a push rod (523) is provided at the bottom edge of the flywheel (522); the flywheel (522) is arranged above the right piston rod (421); when the flywheel (522) rotates, the push rod (523) is periodically and alternately located in the right rod groove (4211) or the left rod groove (4221).

4. A concrete spraying device for tunnel construction according to claim 3, characterized in that: The gear transmission member (53) rotates at the bottom of the auger groove (32); a main transmission wheel (532) is provided at the front end of the gear transmission member (53); a transmission bevel gear (531) is provided on the main transmission wheel (532); the main transmission wheel (532) is connected to the auger transmission wheel (341) via a transmission belt; and the transmission bevel gear (531) is meshedly connected to the motor bevel gear (521).

5. A concrete spraying device for tunnel construction according to claim 4, characterized in that: The pressure stabilizing device (6) comprises a pressure stabilizing tank (61) and a pressure transformer cylinder (62). Feed pipes (611) are provided at both ends of the front side of the pressure stabilizing tank (61). The feed pipes (611) are respectively connected to both ends of the bottom of the booster pump tank (41). The pressure transformer cylinder (62) is arranged at the top of the rear side of the pressure stabilizing tank (61). A booster discharge pipe (612) is provided at the bottom of the pressure stabilizing tank (61).

6. A concrete spraying device for tunnel construction according to claim 5, characterized in that: A shaft sleeve sliding cylinder (621) is provided at the top of the transformer cylinder (62), and a scale groove (622) is provided on the shaft sleeve sliding cylinder (621). A voltage stabilizing plate (63) is provided inside the transformer cylinder (62), and a voltage stabilizing plate spring (632) is provided at the top of the voltage stabilizing plate (63). The end of the voltage stabilizing plate spring (632) is provided on the top wall of the transformer cylinder (62), and the voltage stabilizing plate (63) is slidably arranged inside the transformer cylinder (62).

7. A concrete spraying device for tunnel construction according to claim 6, characterized in that: The voltage stabilizing plate (63) is also provided with a voltage stabilizing plate threaded sleeve (631), the voltage stabilizing plate threaded sleeve (631) is located at the center of the voltage stabilizing plate spring (632), the voltage stabilizing plate threaded sleeve (631) is slidably arranged in a sleeve sliding cylinder (621), a regulating valve (64) is provided on the sleeve sliding cylinder (621), a threaded rod (641) is provided at the bottom of the regulating valve (64), and the threaded rod (641) is threadedly connected to the voltage stabilizing plate threaded sleeve (631).

8. A concrete spraying device for tunnel construction according to claim 7, characterized in that: The front side of the working vehicle (2) is provided with a control room (21) and a spray control arm (22); the spray control arm (22) is located on the left side of the control room (21); a concrete spray hose (23) is provided on the spray control arm (22); a concrete nozzle (24) is provided at the front end of the spray control arm (22); one end of the concrete spray hose (23) is connected to the pressurized discharge pipe (612); and the other end of the concrete spray hose (23) is connected to the concrete nozzle (24).

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