Dust removal type guniting device with liftable spiral

Abstract

The utility model belongs to the technical field of coal mine underground support, and particularly relates to a dust removal type guniting device with a lifting spiral, which comprises a vehicle body, a dust removal device and a dust removal device, the spray gun, the guniting device and the spiral feeding machine are sequentially communicated in the moving direction of the vehicle body; the water spraying device is arranged above the spiral feeding machine and is used for humidifying the materials and reducing dust; the feeding end of the spiral feeding machine communicates with the discharging end of a first feeding hopper, the discharging end of a second feeding hopper and the discharging end of a third feeding hopper. And the control assembly is located on one side of the guniting device and used for controlling the spiral feeding machine, the first feeding hopper, the second feeding hopper, the third feeding hopper and the guniting device. The device does not need manual burdening, can control the material conveying speed of the first feeding hopper, the second feeding hopper and the third feeding hopper to mix proportional components in materials, saves manpower and material resources, reduces cost and improves efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground support in coal mines, and particularly relates to a dust-removing shotcreting device with a liftable screw. Background Art

[0002] Most of the traditional shotcreting processes are manual batching, mixing and feeding on site, which requires a lot of manpower, has a high labor intensity, low efficiency, inaccurate mixing ratio of concrete sand, gravel, cement, accelerator and water, uneven manual mixing, and a large amount of dust pollution is generated during the mixing process of underground materials, seriously endangering the physical health of workers, and it is difficult to control the construction quality underground.

[0003] Since the height of the feeding port of the shotcreting machine is relatively high and it is inconvenient for manual feeding, some coal mines currently have equipped screw feeding equipment to feed the shotcreting machine, which additionally increases the number of equipment to be operated, and the screw feeder does not have the function of proportioning ingredients, seriously reducing the shotcreting efficiency, and it is very inconvenient to move the equipment.

[0004] Therefore, there is an urgent need for a dust-removing shotcreting device with a liftable screw to solve the problem. Content of the Utility Model

[0005] The purpose of the utility model is to provide a dust-removing shotcreting device with a liftable screw to solve the above problems.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] A dust-removing shotcreting device with a liftable screw, comprising:

[0008] A vehicle body, which moves through crawlers;

[0009] A spray gun, a shotcreting device and a screw feeder which are sequentially connected and communicated along the moving direction of the vehicle body;

[0010] A water spraying device, which is arranged above the screw feeder and is used for humidifying and dust-removing the materials;

[0011] The feeding end of the screw feeder is communicated with the discharging ends of a first feeding hopper, a second feeding hopper and a third feeding hopper;

[0012] A control component, which is located on one side of the shotcreting device and is used for controlling the screw feeder, the first feeding hopper, the second feeding hopper, the third feeding hopper and the shotcreting device.

[0013] Preferably, a first spiral is rotatably connected in the first feeding hopper, one end of the first spiral is axially connected to the output shaft of the second hydraulic motor, the fixed end of the second hydraulic motor is fixed to the side wall of the first feeding hopper, the other end of the first spiral is axially connected to a sprocket, and the discharge end of the first spiral is connected to the feed end of the spiral feeder;

[0014] The first feeding hopper is fixedly connected to the screw feeder.

[0015] Preferably, a second spiral is rotatably connected in the second feeding hopper, one end of the second spiral is axially connected to another sprocket, the two sprockets are connected by a chain transmission, and the other end of the second spiral is connected to the third feeding hopper by a connecting shaft;

[0016] The discharge end of the second spiral body is connected to the feed end of the spiral feeder;

[0017] The second feeding hopper is fixedly connected to one side of the first feeding hopper.

[0018] Preferably, a third spiral is rotatably connected inside the third feeding hopper, and one end of the third spiral is axially connected to the end of the connecting shaft;

[0019] The discharge end of the third spiral body is connected to the feed end of the spiral feeder;

[0020] The third feeding hopper is fixedly connected to the screw feeder.

[0021] Preferably, a spiral auger is rotatably connected inside the spiral feeder, one end of the spiral auger is axially connected to the output shaft of the first hydraulic motor, and the fixed end of the first hydraulic motor is fixedly connected to the outer wall of the spiral feeder;

[0022] One end of the outer wall of the spiral feeder is hinged to the vehicle body, the other end of the outer wall of the spiral feeder is hinged to the movable end of a spiral lifting device, and the fixed end of the spiral lifting device is hinged to the vehicle body.

[0023] Preferably, the control assembly includes a hydraulic unit and a control unit, the control unit is used to control the spraying device and the hydraulic unit, and the hydraulic unit is connected to the first hydraulic motor, the second hydraulic motor and the spiral lifting device.

[0024] Preferably, the control unit includes a seat and an operating handle, the seat is fixed to the vehicle body, the operating handle is installed on a workbench in front of the seat, and the operating handle is used to control the hydraulic unit and the spraying device.

[0025] Preferably, the hydraulic part includes a hydraulic oil tank, a hydraulic pump and a hydraulic oil cooling device fixed on the vehicle body. The hydraulic oil tank is used to supply hydraulic oil to the hydraulic pump. The input shaft of the hydraulic pump is axially connected to the output end of a motor, and the fixed end of the motor is fixedly connected to the vehicle body through a frame. The hydraulic oil cooling device is used for cooling the hydraulic oil, and the hydraulic pump is used to pump the hydraulic oil to the screw lifting device, the second hydraulic motor and the first hydraulic motor.

[0026] Preferably, the spray gun includes a shotcrete pipe, which is communicated with the discharge end of the shotcrete device. One end of a spray head weldment is coaxially sleeved outside the shotcrete pipe, and the shotcrete pipe and the spray head weldment are fixedly connected by screws. The other end of the spray head weldment is communicated with a spray gun head. One end of a water pipe is communicated with the side wall of the spray head weldment, and the water pipe is fixed to the side wall of the spray head weldment. The other end of the water pipe is communicated with a valve, and the valve is communicated with a water inlet pipe. A water atomization bushing is arranged inside the spray head weldment. There is a gap between the outer wall of the water atomization bushing and the inner wall of the spray head weldment, and the gap is communicated with the water outlet end of the water pipe. The water atomization bushing is communicated with the shotcrete pipe, and the gap and the shotcrete pipe are communicated through a hole group opened on the water atomization bushing;

[0027] Four hole groups are arranged on the water atomization bushing at equal intervals, and the adjacent two hole groups are rotated by 15°. Each hole group includes six through holes, and the six through holes are circumferentially arranged on the water atomization bushing at equal intervals.

[0028] Compared with the prior art, the utility model has the following advantages and technical effects:

[0029] During use, the vehicle body moves through the crawler. After moving to the designated position, the tail end of the screw feeder is lowered to the ground through the control component to reduce the feeding height. The shotcrete raw materials are respectively added into the first feeding hopper, the second feeding hopper and the third feeding hopper. The raw materials are respectively conveyed into the screw feeder by the first feeding hopper, the second feeding hopper and the third feeding hopper for mixing. The water spraying device is used to humidify and reduce the dust of the materials. The screw feeder is used to stir and convey the materials. The stirred materials are sent into the shotcrete device and sprayed by the spray gun. This device does not require manual batching, and the proportion of components in the mixture can be controlled by controlling the feeding speeds of the first feeding hopper, the second feeding hopper and the third feeding hopper, saving manpower and material resources and reducing costs and increasing efficiency. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings:

[0031] Figure 1 Structural schematic diagram of the present invention;

[0032] Figure 2 For the present invention Figure 1 Structural schematic diagram in the A direction of the present invention;

[0033] Figure 3 For the present invention Figure 1 Structural schematic diagram in the B direction of the present invention;

[0034] Figure 4 Structural schematic diagram of the spray gun of the present invention;

[0035] Figure 5 Structural schematic diagram of the water atomization bushing of the present invention;

[0036] Wherein, 1, the first feeding hopper; 2, the second feeding hopper; 3, the third feeding hopper; 4, the screw feeder; 5, the first hydraulic motor; 6, the spraying device; 7, the pressing mechanism; 8, the self - tipping mechanism; 9, the rotor hoisting mechanism; 10, the dust collector; 11, the operation handle; 12, the seat; 13, the crawler; 14, the hydraulic pump; 15, the hydraulic oil cooling device; 16, the motor; 17, the screw lifting device; 18, the spray gun; 19, the water spraying device; 20, the hydraulic oil tank; 21, the sprocket; 22, the chain; 23, the first screw body; 24, the second hydraulic motor; 25, the third screw body; 26, the second screw body; 1801, the spray gun head; 1802, the nozzle welded part; 1803, the valve; 1804, the water pipe; 1805, the screw; 1806, the spraying pipe; 1807, the water atomization bushing. Detailed implementation manners

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] To make the above - mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0039] Example 1:

[0040] Refer to Figures 1 to 3 , this example discloses a dust-removing spraying device with a liftable screw, including:

[0041] A vehicle body that moves through a crawler 13;

[0042] A spray gun 18, a spraying device 6, and a screw feeder 4 that are connected in sequence along the moving direction of the vehicle body;

[0043] A water spraying device 19, which is arranged above the screw feeder 4 and is used to humidify and reduce dust for the materials;

[0044] The feeding end of the screw feeder 4 is connected to the discharging ends of a first feeding hopper 1, a second feeding hopper 2, and a third feeding hopper 3;

[0045] A control component, which is located on one side of the spraying device 6 and is used to control the screw feeder 4, the first feeding hopper 1, the second feeding hopper 2, the third feeding hopper 3, and the spraying device 6.

[0046] During use, the vehicle body moves through the crawler 13. After moving to the designated position, the tail end of the screw feeder 4 is lowered to the ground through the control component to reduce the feeding height. The spraying raw materials are respectively added into the first feeding hopper 1, the second feeding hopper 2, and the third feeding hopper 3. The raw materials are respectively conveyed into the screw feeder 4 by the first feeding hopper 1, the second feeding hopper 2, and the third feeding hopper 3 for mixing. The materials are humidified and dust-reduced by the water spraying device 19. The materials are stirred and conveyed by the screw feeder 4, and the stirred materials are sent into the spraying device 6, and the materials are sprayed by the spray gun 18. This device does not require manual batching. The proportion components in the mixture can be controlled by controlling the feeding speeds of the first feeding hopper 1, the second feeding hopper 2, and the third feeding hopper 3, saving manpower and material resources and reducing costs and increasing efficiency.

[0047] In a further optimized solution, a first screw body 23 is rotatably connected in the first feeding hopper 1. One end of the first screw body 23 is axially connected to the output shaft of a second hydraulic motor 24, and the fixed end of the second hydraulic motor 24 is fixedly connected to the side wall of the first feeding hopper 1. The other end of the first screw body 23 is axially connected to a sprocket 21, and the discharging end of the first screw body 23 is communicated with the feeding end of the screw feeder 4;

[0048] The first feeding hopper 1 is fixedly connected to the screw feeder 4.

[0049] In a further optimized solution, a second screw body 26 is rotatably connected in the second feeding hopper 2. One end of the second screw body 26 is axially connected to another sprocket 21, and the two sprockets 21 are connected by a chain 22. The other end of the second screw body 26 is connected to the third feeding hopper 3 through a connecting shaft;

[0050] The discharge end of the second screw 26 communicates with the feed end of the screw feeder 4;

[0051] The second hopper 2 is fixedly connected to one side of the first hopper 1.

[0052] In a further optimized solution, a third screw 25 is rotatably connected in the third hopper 3, and one end of the third screw 25 is axially connected to the end of the connecting shaft;

[0053] The discharge end of the third screw 25 communicates with the feed end of the screw feeder 4;

[0054] The third hopper 3 is fixedly connected to the screw feeder 4.

[0055] The pitches of the first screw 23, the third screw 25 and the second screw 26 are all different, so the conveying speeds are not the same. The batching ratio is adjusted by adjusting the ratio of the conveying speeds, and then the pitch is matched according to the designed conveying speed. Sliding plates are provided at the discharge ends of the first hopper 1, the second hopper 2 and the third hopper 3 to control the size of the discharge ports at the discharge ends of the first hopper 1, the second hopper 2 and the third hopper 3, and the control of the feeding amount can also be achieved.

[0056] The first screw 23 is driven by the second hydraulic motor 24. The first screw 23 and the second screw 26 are synchronously rotated through the cooperation of the sprocket 21 and the chain 22. The third screw 25 and the second screw 26 are axially connected by a connecting shaft, so that the first screw 23, the third screw 25 and the second screw 26 can be driven to rotate simultaneously by the second hydraulic motor 24.

[0057] In a further optimized solution, a screw auger is rotatably connected in the screw feeder 4, and one end of the screw auger is axially connected to the output shaft of the first hydraulic motor 5, and the fixed end of the first hydraulic motor 5 is fixedly connected to the outer wall of the screw feeder 4;

[0058] One end of the outer wall of the screw feeder 4 is hinged to the vehicle body, and the other end of the outer wall of the screw feeder 4 is hinged to the movable end of the screw lifting device 17, and the fixed end of the screw lifting device 17 is hinged to the vehicle body.

[0059] The raw materials are mixed and conveyed by the screw auger.

[0060] During the conveying process, the water spraying device 19 humidifies and dedusts the materials.

[0061] In a further optimized solution, the control component includes a hydraulic part and a control part. The control part is used to control the spraying device 6 and the hydraulic part, and the hydraulic part is communicated with the first hydraulic motor 5, the second hydraulic motor 24 and the screw lifting device 17.

[0062] For a further optimized solution, the control section includes a seat 12 and an operating handle 11. The seat 12 is fixedly connected to the vehicle body, and the operating handle 11 is installed on the front workbench of the seat 12. The operating handle 11 is used to control the hydraulic section and the spraying device 6.

[0063] For a further optimized solution, the hydraulic section includes a hydraulic oil tank 20, a hydraulic pump 14, and a hydraulic oil cooling device 15 that are fixedly connected to the vehicle body. The hydraulic oil tank 20 is used to supply hydraulic oil to the hydraulic pump 14. The input shaft of the hydraulic pump 14 is axially connected to the output end of a motor 16. The fixed end of the motor 16 is fixedly connected to the vehicle body through a frame. The hydraulic oil cooling device 15 is used for cooling the hydraulic oil. The hydraulic pump 14 is used to pump the hydraulic oil to the screw lifting device 17, the second hydraulic motor 24, and the first hydraulic motor 5.

[0064] Embodiment 2:

[0065] The difference between this embodiment and Embodiment 1 is that the pressing mechanism 7 of the spraying device 6 uses a hydraulic rod for pressing.

[0066] The spraying device 6 includes a panel, a speed reducer, a rotor body, a rotor body rotating seat, a hopper seat, and a hopper. The fixed end of the speed reducer is fixedly connected to the vehicle body. The panel is fixedly connected to the fixed end of the speed reducer. The rotor body is rotatably arranged on the panel through the rotor body rotating seat. The output shaft of the speed reducer passes through the panel and is connected to the bottom of the rotor body through a square shaft. The rotor body rotating seat is a wear-resistant rubber seat.

[0067] The hopper seat is pressed on the rotor body through the pressing mechanism 7.

[0068] In the traditional technology, the pressing mechanism 7 uses a threaded pressing rod. Replace the existing threaded pressing rod with a hydraulic rod, and install the pressing head at the movable end of the hydraulic rod. The fixed end of the hydraulic rod is hinged on the panel. When the hydraulic rod contracts, the hopper seat and the rotor body are pressed through the pressing head. The hydraulic rod is equipped with a pressure compensator. By using hydraulic pressing, while ensuring the pressing force, it can also adjust the pressing force of each hydraulic rod in real time according to the data fed back by the pressure compensator, making the pressing force between the hopper seat and the rotor body uniform and stable.

[0069] One end of a hydraulic flipping mechanism 8 is installed on the side wall of the hopper seat of the spraying device 6, and the other end of the hydraulic flipping mechanism 8 is installed on the panel. The hydraulic flipping mechanism 8 is used to flip the hopper seat of the spraying device 6.

[0070] The hydraulic flipping mechanism 8 includes a telescopic hydraulic rod and a hopper flipping seat. The hopper flipping seat is fixed on the panel. The side wall of the hopper seat of the spraying device 6 is hinged to the hopper flipping seat. The movable end of the telescopic hydraulic rod is hinged to the hopper seat, and the fixed end of the telescopic hydraulic rod is hinged to the panel. Since the hopper seat of the spraying device 6 is hinged to the hopper flipping seat, the hopper seat can be overturned by the telescopic hydraulic rod, replacing manual labor.

[0071] On one side of the shotcreting device 6, there is a rotor hoisting mechanism 9, and the rotor hoisting mechanism 9 is fixed on the panel.

[0072] When replacing the rubber plate, after the hopper seat is overturned and the rotor body is exposed, the rotor body can be hoisted by the rotor hoisting mechanism 9, replacing manual handling, which saves time and effort.

[0073] On one side of the shotcreting device 6, there is a dust collector 10, and the dust collector 10 is fixed on the vehicle body.

[0074] The dust collector 10 is used for collecting dust during the pressure relief process of the shotcreting device 6.

[0075] Embodiment 3:

[0076] Reference Figures 4 to 5 , the difference between this embodiment and Embodiment 1 is that the spray gun 18 includes a shotcreting pipe 1806, the shotcreting pipe 1806 is communicated with the discharge end of the shotcreting device 6, one end of the shotcreting pipe 1806 is coaxially sleeved with a spray head welding part 1802, the shotcreting pipe 1806 and the spray head welding part 1802 are fixedly connected by screws 1805, the other end of the spray head welding part 1802 is communicated with a spray gun head 1801, one end of a water pipe 1804 is communicated with the side wall of the spray head welding part 1802, the water pipe 1804 is fixed to the side wall of the spray head welding part 1802, the other end of the water pipe 1804 is communicated with a valve 1803, the valve 1803 is communicated with the water inlet pipe, a water atomization bushing 1807 is arranged in the spray head welding part 1802, there is a gap between the outer wall of the water atomization bushing 1807 and the inner wall of the spray head welding part 1802, the gap is communicated with the water outlet end of the water pipe 1804, the water atomization bushing 1807 is communicated with the shotcreting pipe 1806, and the gap and the shotcreting pipe 1806 are communicated through a hole group opened on the water atomization bushing 1807;

[0077] Four equally spaced hole groups are opened on the water atomization bushing 1807, and the adjacent two hole groups are rotated by 15°, and each hole group includes six through holes, and the six through holes are circumferentially equally spaced on the water atomization bushing 1807.

[0078] Four equally spaced hole groups are opened on the water atomization bushing 1807, and the adjacent two hole groups are rotated by 15°, and each hole group includes six through holes, and the six through holes are circumferentially equally spaced on the water atomization bushing 1807.

[0079] The diameter of the through hole is 1.5 mm.

[0080] During use, the water inlet pipe enters the gap through the valve 1803 and the spray head welding part 1804. After the gap is filled with water, it enters the water atomization bushing 1807 through each through hole and mixes with the slurry conveyed by the shotcreting pipe 1806. When the water passes through the through hole, it is in a spray state and mixes with the slurry, making the mixing of the slurry and water more uniform and improving the uniformity of the shotcreting material.

[0081] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0082] The above-described embodiments are only descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A dust removal type shotcreting device with a liftable screw, characterized in that, Comprising: A vehicle body that moves via crawlers (13); A spray gun (18), a shotcreting device (6), and a screw feeder (4) that are connected in sequence along the moving direction of the vehicle body; A water spraying device (19) that is arranged above the screw feeder (4) and is used for humidifying and dust suppressing the material; The feeding end of the screw feeder (4) is connected to the discharging ends of a first feeding hopper (1), a second feeding hopper (2), and a third feeding hopper (3); A control assembly that is located on one side of the shotcreting device (6), and the control assembly is used for controlling the screw feeder (4), the first feeding hopper (1), the second feeding hopper (2), the third feeding hopper (3), and the shotcreting device (6).

2. The dust-removing shotcreting device with a liftable screw according to claim 1, wherein: A first screw body (23) is rotatably connected inside the first feeding hopper (1), one end of the first screw body (23) is axially connected to the output shaft of a second hydraulic motor (24), the fixed end of the second hydraulic motor (24) is fixedly connected to the side wall of the first feeding hopper (1), the other end of the first screw body (23) is axially connected to a sprocket (21), and the discharging end of the first screw body (23) is connected to the feeding end of the screw feeder (4); The first feeding hopper (1) is fixedly connected to the screw feeder (4).

3. The dust-removing shotcreting device with a liftable screw according to claim 2, characterized in that: A second screw body (26) is rotatably connected inside the second feeding hopper (2), one end of the second screw body (26) is axially connected to another sprocket (21), the two sprockets (21) are connected by a chain (22), and the other end of the second screw body (26) is connected to the third feeding hopper (3) through a connecting shaft; The discharging end of the second screw body (26) is connected to the feeding end of the screw feeder (4); The second feeding hopper (2) is fixedly connected to one side of the first feeding hopper (1).

4. A dust-removing shotcreting device with a liftable screw according to claim 3, characterized in that: A third screw body (25) is rotatably connected inside the third feeding hopper (3), and one end of the third screw body (25) is axially connected to the end of the connecting shaft; The discharging end of the third screw body (25) is connected to the feeding end of the screw feeder (4); The third feeding hopper (3) is fixedly connected to the screw feeder (4).

5. The dust-removing shotcreting device with a liftable screw according to claim 2, wherein: A screw auger is rotatably connected inside the screw feeder (4), one end of the screw auger is axially connected to the output shaft of a first hydraulic motor (5), and the fixed end of the first hydraulic motor (5) is fixedly connected to the outer wall of the screw feeder (4); One end of the outer wall of the screw feeder (4) is hinged to the vehicle body, and the other end of the outer wall of the screw feeder (4) is hinged to the movable end of a screw lifting device (17), and the fixed end of the screw lifting device (17) is hinged to the vehicle body.

6. The dust-removing shotcreting device with a liftable screw according to claim 5, characterized in that: The control assembly includes a hydraulic part and a control part. The control part is used for controlling the shotcreting device (6) and the hydraulic part, and the hydraulic part is connected to the first hydraulic motor (5), the second hydraulic motor (24), and the screw lifting device (17).

7. The dust-removing shotcreting device with a liftable screw according to claim 6, characterized in that: The control unit includes a seat (12) and an operation handle (11). The seat (12) is fixedly connected to the vehicle body. The operation handle (11) is installed on the front workbench of the seat (12), and the operation handle (11) is used to control the hydraulic unit and the shotcreting device (6).

8. The dust-removing shotcreting device with a liftable screw according to claim 7, characterized in that: The hydraulic unit includes a hydraulic oil tank (20), a hydraulic pump (14) and a hydraulic oil cooling device (15) fixedly connected to the vehicle body. The hydraulic oil tank (20) is used to supply hydraulic oil to the hydraulic pump (14). The input shaft of the hydraulic pump (14) is axially connected to the output end of a motor (16). The fixed end of the motor (16) is fixedly connected to the vehicle body through a frame. The hydraulic oil cooling device (15) is used for cooling the hydraulic oil. The hydraulic pump (14) is used to pump the hydraulic oil to the screw lifting device (17), the second hydraulic motor (24) and the first hydraulic motor (5).

9. A dust removal type shotcreting device with a liftable screw according to claim 1, characterized in that: The spray gun (18) includes a shotcreting pipe (1806). The shotcreting pipe (1806) is communicated with the discharge end of the shotcreting device (6). One end of a spray head welding part (1802) is coaxially sleeved outside the shotcreting pipe (1806). The shotcreting pipe (1806) and the spray head welding part (1802) are fixedly connected by screws (1805). The other end of the spray head welding part (1802) is communicated with a spray gun head (1801). One end of a water pipe (1804) is communicated with the side wall of the spray head welding part (1802). The water pipe (1804) is fixed to the side wall of the spray head welding part (1802). The other end of the water pipe (1804) is communicated with a valve (1803), and the valve (1803) is communicated with a water inlet pipe. A water atomization bushing (1807) is arranged inside the spray head welding part (1802). There is a gap between the outer wall of the water atomization bushing (1807) and the inner wall of the spray head welding part (1802). The gap is communicated with the water outlet end of the water pipe (1804). The water atomization bushing (1807) is communicated with the shotcreting pipe (1806). The gap and the shotcreting pipe (1806) are communicated through holes formed in the water atomization bushing (1807). Four hole groups are arranged at equal intervals on the water atomization bushing (1807). The adjacent two hole groups are rotated by 15°. Each hole group includes six through holes, and the six through holes are circumferentially arranged at equal intervals on the water atomization bushing (1807).

Images