Tunnel chiseling and spraying all-in-one machine

Abstract

The invention relates to the field of tunnel construction, and discloses a tunnel chiseling and spraying all-in-one machine which comprises a heading machine, a spraying device, a spraying device and a spraying device. The concrete spraying machine is adjustably arranged on the heading machine and used for spraying concrete to the inner wall of the tunnel which is chiseled and supported; and the trowelling unit is arranged on a connector on the shotcrete machine and used for trowelling concrete sprayed on the inner wall of the tunnel. Through innovative combination of vibration of the heading machine, the shotcrete machine and the integrated trowelling unit, the limitation of traditional tunnel construction equipment is broken through; efficient, high-quality and low-cost tunnel lining construction is achieved, continuous construction of rock drilling tunneling and concrete spraying operation is achieved, the mechanical operation degree is high, the labor intensity of workers is reduced, the construction operation efficiency is improved, and operation safety is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, in particular to a tunnel drilling and spraying integrated machine. Background Art

[0002] When tunneling is done using the mining method, temporary support structures must be constructed as early as possible in the excavation section to reduce deformation of the surrounding rock and ensure construction safety. Typically, the construction process involves excavation followed by shotcrete support.

[0003] The existing equipment has the following disadvantages: the existing tunnel boring machine is separated from the concrete spraying. During the tunnel construction process, after the tunnel boring machine completes the chiseling of the tunnel inner wall, it needs to retreat a certain distance to provide operating space for the concrete spraying device. The conversion process requires the exit and entry of mechanical equipment, and the surface of the sprayed concrete is uneven, which needs to be flattened later. This makes the tunnel construction process complicated and the construction period long, affecting the tunnel construction efficiency.

[0004] Therefore, the present application now proposes a tunnel boring and spraying machine to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a tunnel drilling and spraying machine to solve the problem that the above-mentioned tunnel construction process is complicated, the construction period is long, and the construction efficiency of the tunnel is affected.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a tunnel boring and spraying machine, comprising: Tunnel boring machines, used to cut tunnels; a concrete spraying machine, adjustable and mounted on the tunnel boring machine, for spraying concrete onto the inner wall of the tunnel after it has been cut and supported; The smoothing unit is arranged on the connecting head of the concrete spraying machine and is used for smoothing the concrete sprayed on the inner wall of the tunnel.

[0007] Wherein, the concrete spraying machine comprises: A rotating chassis is provided on the tunnel boring machine; a mechanical arm, adjustably arranged on the rotating chassis; The nozzle is arranged on the connecting head and is connected to the concrete conveying device through a conveying pipe, and is used for spraying concrete onto the inner wall of the tunnel after support is completed.

[0008] Wherein, the smoothing unit comprises: A fixing seat, arranged on the connecting head; A mounting frame, arranged on a side of the fixing base away from the connector; A power member is arranged on the mounting frame; A fixing frame, arranged on a side of the power member away from the mounting frame; A vibrating rod is arranged on a side of the fixing frame away from the power member and is used for vibrating the concrete sprayed on the inner wall of the tunnel.

[0009] Wherein, the smoothing unit further comprises: The extrusion assembly is arranged on a side of the fixing frame away from the power member and is used to flatten the concrete sprayed on the inner wall of the tunnel.

[0010] Wherein, the extrusion assembly includes: Motors are arranged on side panels on both sides of the fixing frame; A rotating shaft is provided at the power output end of the motor and passes through the side plate; The pressing roller is arranged on the rotating shaft and located between the two side plates, and is used for flattening the concrete sprayed on the inner wall of the tunnel.

[0011] Wherein, the extrusion assembly further includes: a cleaning mechanism, disposed on the side plate and connected to the pressing roller, for cleaning the concrete remaining on the support frame; A transmission mechanism, disposed on the side plate and connected to the cleaning mechanism; The centering plate is arranged on the transmission mechanism and is used for centering the concrete sprayed on the inner wall of the tunnel toward one side of the pressing roller.

[0012] Wherein, the cleaning mechanism includes: a first wedge-shaped block, arranged on both sides of the pressing roller close to the side plate; A movable rod is provided on the side plate and is provided with a second wedge block on a side close to the pressing roller; A scraper is arranged on a side of the moving rod away from the pressing roller and is used to clean the concrete remaining on the support frame.

[0013] Wherein, the portion of the moving rod located between the second wedge-shaped block and the side plate is sleeved with an elastic member; The second wedge block is provided with a protective ring for protecting the elastic member; The protective rings are two symmetrically arranged semicircular arc structures and are inserted into the through grooves provided on the side plates.

[0014] Wherein, the transmission mechanism includes: An installation box is arranged on the side panel; a first rack, provided on the movable rod and passing through a movable slot provided on the mounting box; A connecting shaft is arranged inside the installation box; an incomplete gear, fixed on the connecting shaft and meshingly connected with the first rack; The second rack is arranged inside the installation box and is meshed with the incomplete gear, and one side of the second rack passes through the installation box and is fixedly connected to the center plate.

[0015] A slide rail is provided inside the installation box, and a limiting block slidably connected to the inside of the slide rail is provided on one side where the second rack is connected to the slide rail.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention overcomes the limitations of traditional tunnel construction equipment through the innovative combination of a tunnel boring machine vibrator, a concrete sprayer, and an integrated trowel unit. It achieves efficient, high-quality, and low-cost tunnel lining construction, enabling continuous rock drilling and concrete spraying operations. This highly mechanized operation reduces worker labor intensity, improves construction efficiency, and ensures operational safety. 2. In the process of rotation of the pressing roller, the present invention drives the cleaning mechanism to move, so that the cleaning structure can scrape off the excess concrete on the support frame. In the process of movement of the cleaning mechanism, the transmission mechanism will drive the center plate to move, so that the center plate will push the concrete sprayed on the side of the support frame closer to the side of the pressing roller, so that the concrete can be distributed more evenly at the front end of the pressing roller, avoiding the problem of excessive or insufficient local flattening caused by uneven distribution of concrete, thereby improving the overall quality of concrete flattening and making the concrete layer on the inner wall of the tunnel more flat and smooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention; Figure 2 This is a structural diagram of a concrete spraying machine according to an embodiment of the present invention; Figure 3 This is a structural diagram of a concrete spraying machine when a trowel unit is installed in accordance with an embodiment of the present invention; Figure 4 This is a structural diagram of a leveling unit in one embodiment of the present invention; Figure 5 This is a schematic structural diagram of a connector in one embodiment of the present invention; Figure 6 This is a schematic structural diagram of a pressing assembly in one embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the connection between the pressing assembly and the vibrating rod in one embodiment of the present invention; Figure 8 This is a schematic structural diagram of a pressing assembly in a front view according to an embodiment of the present invention; Figure 9This is a schematic structural diagram of a side view of a pressing assembly in one embodiment of the present invention; Figure 10 This is a schematic structural diagram of a cross-section of a pressing assembly in one embodiment of the present invention; Figure 11 This is a schematic structural diagram of a cleaning mechanism in one embodiment of the present invention; Figure 12 A schematic structural diagram of a transmission mechanism in one embodiment of the present invention; Figure 13 This is a schematic structural diagram of an explosion of a pressing component in one embodiment of the present invention; Figure 14 This is a schematic structural diagram of the explosion of the transmission mechanism in one embodiment of the present invention; Figure 15 for Figure 14 Schematic diagram of the structure with the A part in the middle enlarged.

[0018] In the figure: 1. Tunnel boring machine; 2. Concrete spraying machine; 21. Rotating chassis; 22. Robotic arm; 221. Connector; 23. Spray head; 24. Delivery pipe; 25. Smoothing unit; 251. Fixing seat; 252. Mounting frame; 253. Power element; 254. Fixing frame; 2541. Side plate; 254101. Grooving; 255. Vibrating rod; 256. Pressing assembly; 2561. Motor; 2562. Rotating shaft; 2563. Pressing roller; 2564. Cleaning mechanism; 25 641. First wedge block; 25642. Second wedge block; 25643. Moving rod; 25644. Scraper; 25645. Protective ring; 25646. Elastic member; 2565. Transmission mechanism; 25651. Mounting box; 2565101. Moving groove; 25652. First rack; 25653. Connecting shaft; 25654. Incomplete gear; 25655. Second rack; 256551. Limit block; 256552. Slide rail; 2566. Centering plate. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-15The present invention provides a technical solution: a tunnel boring and spraying machine, comprising: a tunnel boring machine 1, used for boring a tunnel; a concrete spraying machine 2, which is adjustably arranged on the tunnel boring machine 1 and used for spraying concrete onto the inner wall of the tunnel after boring and supporting; a smoothing unit 25, which is arranged on a connector 221 on the concrete spraying machine 2 and used for smoothing the concrete sprayed on the inner wall of the tunnel.

[0021] It should be noted that, during operation, the concrete spraying machine 2 is combined with the tunnel boring machine 1. After the tunnel boring machine 1 completes the tunneling construction, the concrete spraying machine 2 on the tunnel boring machine 1 is used to carry out the initial support concrete spraying construction of the excavation surface. After the concrete is sprayed onto the inner wall of the tunnel, the smoothing unit 25 can synchronously smooth the surface of the concrete. After the concrete is sprayed on the frame after the initial support is completed, the tunnel boring machine 1 uses the concrete strengthening waiting time to chisel the inner wall of the next section of the tunnel for construction and build the frame through the trolley. This method reduces the need for the tunnel boring machine 1 to retreat to vacate the spray anchor working surface and reduces the process conversion time. In addition, the concrete spraying machine 2 is mechanized. After the spraying is completed, the surface of the poured concrete is smoothed by the smoothing unit 25, which not only reduces the need for subsequent leveling of the concrete wall, but also reduces the exposure of the excavation surface and the possible harm to the human body caused by factors such as concrete particles during the spraying process. This device breaks through the limitations of traditional tunnel construction equipment through the innovative combination of the tunnel boring machine 1 vibration, the concrete spraying machine 2 and the integrated smoothing unit 25, realizes efficient, high-quality and low-cost tunnel lining construction, and realizes the continuous construction of rock drilling and concrete spraying operations. The degree of mechanization is high, the labor intensity of workers is reduced, the construction efficiency is improved, and the operation safety is guaranteed.

[0022] In one embodiment, the concrete spraying machine 2 includes: a rotating chassis 21, which is installed on the tunnel boring machine 1; a mechanical arm 22, which is adjustably installed on the rotating chassis 21; a nozzle 23, which is installed on a connecting head 221 and connected to a concrete conveying device through a conveying pipe 24, and is used to spray concrete onto the inner wall of the tunnel after support.

[0023] This design refers to Figure 1-5The rotating chassis 21 can drive the mechanical arm 22 to rotate in the horizontal direction to cover the entire cross-section of the tunnel. The spraying area can be adjusted without frequently moving the tunnel boring machine 1, adapting to the changes in the tunnel shape under complex geological conditions, and greatly reducing the equipment repositioning time. The mechanical arm 22 has multi-degree-of-freedom adjustment functions (such as pitch, swing, and telescopic), which can accurately control the distance and angle between the nozzle 23 and the inner wall of the tunnel to achieve uniform distribution of concrete and reduce the phenomenon of missed spraying or repeated spraying. The nozzle 23 is directly connected to the concrete conveying device through the conveying pipe 24. The conveying pipe 24 adopts a flexible design and moves automatically with the movement of the mechanical arm 22. Dynamic adjustment can be made to avoid entanglement or breakage, thereby ensuring a continuous and stable supply of concrete, reducing construction stagnation caused by feed interruption, and improving the overall operation continuity. The delivery pipe 24 evenly delivers the concrete in the concrete delivery device to the nozzle 23 through the delivery pump, and sprays it from the nozzle 23 onto the frame on the inner wall of the tunnel. The smoothing unit 25 is located on the rear side of the moving direction of the nozzle 23 and can move together with the nozzle 23 to smooth the concrete sprayed on the inner wall of the tunnel, realizing the integrated operation of "spraying-smoothing". There is no need to subsequently level the solidified concrete, which significantly improves construction efficiency.

[0024] In one embodiment, the smoothing unit 25 includes: a fixed base 251, which is arranged on the connecting head 221; a mounting frame 252, which is arranged on the side of the fixed base 251 away from the connecting head 221; a power member 253, which is arranged on the mounting frame 252; a fixed frame 254, which is arranged on the side of the power member 253 away from the mounting frame 252; a vibrating rod 255, which is arranged on the side of the fixed frame 254 away from the power member 253 and is used to vibrate the concrete sprayed on the inner wall of the tunnel. The power member 253 includes but is not limited to a hydraulic cylinder, a linear guide rail, an electric push rod and a cylinder.

[0025] This design, see Figure 3-15 The power member 253 drives the fixing frame 254 to move toward the side close to the concrete wall, and the vibrating rod 255 is extended into the interior of the concrete. When the concrete spraying machine 2 sprays concrete, the connecting head 221 vibrates, thereby driving the vibrating rod 255 that penetrates into the concrete to vibrate, thereby reducing bubbles in the concrete, preliminarily leveling the concrete surface, and making the concrete surface more uniform.

[0026] In one embodiment, the smoothing unit 25 further includes: a squeezing assembly 256 , which is disposed on a side of the fixing frame 254 away from the power member 253 and is used to flatten the concrete sprayed on the inner wall of the tunnel.

[0027] This design, see Figure 4The extrusion component 256 is arranged on the side of the vibrating rod 255 away from the nozzle 23. It can further squeeze the vibrated concrete surface, expel the air and excess moisture in the concrete, make the concrete more compact, effectively eliminate the unevenness of the concrete surface, and make the concrete layer on the inner wall of the tunnel reach a higher flatness standard, meeting the requirements of the tunnel project for the inner wall quality.

[0028] In one embodiment, the extrusion assembly 256 includes: a motor 2561, which is arranged on the side plates 2541 on both sides of the fixed frame 254; a rotating shaft 2562, which is arranged at the power output end of the motor 2561 and passes through the side plates 2541; and a pressing roller 2563, which is arranged on the rotating shaft 2562 and located between the two side plates 2541, and is used to flatten the concrete sprayed on the inner wall of the tunnel.

[0029] This design, see Figure 6-15 The pressing roller 2563 contacts the surface of the concrete under the drive of the power part 253, and rotates under the drive of the motor 2561 to evenly flatten the surface of the concrete, which greatly improves the efficiency and effect of the flattening operation and shortens the construction time.

[0030] In one embodiment, the extrusion assembly 256 also includes: a cleaning mechanism 2564, which is arranged on the side plate 2541 and connected to the pressing roller 2563, and is used to clean the concrete remaining on the support frame; a transmission mechanism 2565, which is arranged on the side plate 2541 and is connected to the cleaning mechanism 2564; and a centering plate 2566, which is arranged on the transmission mechanism 2565, and is used to center the concrete sprayed on the inner wall of the tunnel to one side of the pressing roller 2563.

[0031] This design, see Figure 6-15 During the rotation of the pressing roller 2563, the cleaning mechanism 2564 is driven to move, so that the cleaning structure can scrape off the excess concrete on the support frame. During the movement of the cleaning mechanism 2564, the center plate 2566 is driven to move through the transmission mechanism 2565, so that the center plate 2566 pushes the concrete sprayed on the side of the support frame closer to the side of the pressing roller 2563, so that the concrete can be distributed more evenly at the front end of the pressing roller 2563, avoiding the problem of excessive or insufficient local flattening caused by uneven distribution of concrete, thereby improving the overall quality of concrete flattening and making the concrete layer on the inner wall of the tunnel more flat and smooth.

[0032] In one embodiment, the cleaning mechanism 2564 includes: a first wedge block 25641, which is arranged on both sides of the pressing roller 2563 close to the side plate 2541; a moving rod 25643, which passes through the side plate 2541 and is provided with a second wedge block 25642 on the side close to the pressing roller 2563; and a scraper 25644, which is arranged on the side of the moving rod 25643 away from the pressing roller 2563 and is used to clean the concrete remaining on the support frame.

[0033] This design, see Figure 10 ,as well as Figure 14 During the rotation of the pressing roller 2563, the first wedge block 25641 is driven to rotate. When the first wedge block 25641 moves to the side of the second wedge block 25642 and contacts the second wedge block 25642, the second wedge block 25642 is squeezed, so that the second wedge block 25642 moves to the side away from the pressing roller 2563, and then moves on the side plate 2541 through the moving rod 25643, so that the scraper 25644 cleans the concrete remaining on the surface of the support frame, and there is no need for a subsequent cleaning process of the solidified concrete wall.

[0034] In one embodiment, the portion of the moving rod 25643 located between the second wedge block 25642 and the side plate 2541 is sleeved with an elastic member 25646; a protective ring 25645 is provided on the second wedge block 25642 for protecting the elastic member 25646; the protective ring 25645 is two symmetrically arranged semicircular arc structures and is passed through the through groove 254101 opened on the side plate 2541, and the elastic member 25646 is made of a spring to be damped or an elastic pad.

[0035] This design, see Figure 11 ,as well as Figure 14 When the first wedge block 25641 squeezes the second wedge block 25642, the second wedge block 25642 squeezes the elastic member 25646. When the first wedge block 25641 is separated from the second wedge block 25642, the elastic member 25646 can quickly push the moving rod 25643 back to the initial position by virtue of its own elastic restoring force, thereby realizing the automatic reset of the moving rod 25643 and preparing for the next cleaning action. The protective ring 25645 is two symmetrical semicircular arc structures, which can be tightly fitted on the outside of the elastic member 25646 to provide all-round protection for the elastic member 25646. In the tunnel construction environment, there are a large amount of impurities such as concrete dust and debris. The protective ring 25645 can prevent these impurities from entering the elastic member 25646, avoiding impurities from causing wear, corrosion or jamming of the elastic member 25646, thereby extending the service life of the elastic member 25646.

[0036] In one embodiment, the transmission mechanism 2565 includes: an installation box 25651, which is arranged on the side plate 2541; a first rack 25652, which is arranged on the moving rod 25643 and passes through the moving groove 2565101 opened on the installation box 25651; a connecting shaft 25653, which is arranged inside the installation box 25651; an incomplete gear 25654, which is fixed on the connecting shaft 25653 and meshed with the first rack 25652; a second rack 25655, which is arranged inside the installation box 25651 and meshed with the incomplete gear 25654 and has one side passing through the installation box 25651 and fixedly connected to the center plate 2566.

[0037] This design, see Figure 12 ,as well as Figure 13 , when the moving rod 25643 makes a linear reciprocating motion toward the side away from the pressing roller 2563 under the push of the first wedge block 25641, it drives the first rack 25652 to move synchronously in a linear manner in the moving groove 2565101 of the mounting box 25651. Since the first rack 25652 is meshed and connected with the incomplete gear 25654, during the translation of the first rack 25652, it will drive the incomplete gear 25654 to rotate on the connecting shaft 25653, and then make the second rack 25655 move under the action of the incomplete gear 25654. The second rack 25655 drives the center plate 2566 to move toward the side close to the pressing roller 2563, pushing the concrete scattered on both sides of the pressing roller 2563 to the front end of the pressing roller 2563, and then being pressed into the support frame by the squeezing of the pressing roller 2563.

[0038] In one embodiment, a slide rail 256552 is provided inside the installation box 25651 , and a limiting block 256551 slidably connected to the inside of the slide rail 256552 is provided on one side of the second rack 25655 connected to the slide rail 256552 .

[0039] This design, see Figure 13 The slide rail 256552 provides a precise motion track for the second rack 25655. The second rack 25655 is slidably connected to the slide rail 256552 through the limit block 256551, so that the second rack 25655 can only move along the straight line direction specified by the slide rail 256552, avoiding the second rack 25655 from deflecting, shaking or twisting, ensuring the accuracy and stability of the linear motion of the second rack 25655, and then ensuring that the centering plate 2566 fixedly connected to the second rack 25655 can move in the predetermined direction, thereby improving the accuracy of the concrete centering operation.

[0040] In addition, if there are descriptions of "first," "second," etc. in the embodiments, such descriptions are for descriptive purposes only and should not be understood as indicating or implying the relative importance of the description or implicitly indicating the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features.

Claims

1. A tunnel boring and spraying machine, characterized in that: include: A tunnel boring machine (1) for cutting a tunnel; A concrete spraying machine (2) is adjustably mounted on the tunnel boring machine (1) and is used to spray concrete onto the inner wall of the tunnel after it has been cut and supported; The smoothing unit (25) is arranged on the connecting head (221) on the concrete spraying machine (2) and is used to smooth the concrete sprayed on the inner wall of the tunnel.

2. The tunnel boring and spraying machine according to claim 1, characterized in that: The concrete spraying machine (2) comprises: A rotating chassis (21) is provided on the tunnel boring machine (1); A mechanical arm (22) is adjustably arranged on the rotating chassis (21); The spray head (23) is arranged on the connecting head (221) and is connected to the concrete conveying device via a conveying pipe (24), and is used for spraying concrete onto the inner wall of the tunnel after support is completed.

3. The tunnel boring and spraying machine according to claim 1, characterized in that: The smoothing unit (25) comprises: A fixing seat (251) is provided on the connecting head (221); A mounting frame (252) is arranged on a side of the fixing seat (251) away from the connector (221); A power member (253) is arranged on the mounting frame (252); A fixing frame (254) is provided on a side of the power member (253) away from the mounting frame (252); A vibrating rod (255) is provided on a side of the fixing frame (254) away from the power member (253) and is used to vibrate the concrete sprayed on the inner wall of the tunnel.

4. The tunnel boring and spraying machine according to claim 3, characterized in that: The smoothing unit (25) further comprises: The extrusion assembly (256) is arranged on a side of the fixing frame (254) away from the power member (253) and is used to flatten the concrete sprayed on the inner wall of the tunnel.

5. The tunnel boring and spraying machine according to claim 4, characterized in that: The extrusion assembly (256) includes: A motor (2561) is provided on the side panels (2541) on both sides of the fixing frame (254); A rotating shaft (2562) is provided at the power output end of the motor (2561) and is passed through the side plate (2541); A pressing roller (2563) is provided on the rotating shaft (2562) and located between the two side plates (2541), and is used to flatten the concrete sprayed on the inner wall of the tunnel.

6. The tunnel boring and spraying machine according to claim 5, characterized in that: The extrusion assembly (256) further includes: a cleaning mechanism (2564), provided on the side plate (2541) and connected to the pressing roller (2563), for cleaning concrete remaining on the support frame; A transmission mechanism (2565) is provided on the side plate (2541) and is connected to the cleaning mechanism (2564); A centering plate (2566) is provided on the transmission mechanism (2565) and is used to center the concrete sprayed on the inner wall of the tunnel toward one side of the pressing roller (2563).

7. The tunnel boring and spraying machine according to claim 6, characterized in that: The cleaning mechanism (2564) includes: First wedge blocks (25641) are arranged on both sides of the pressing roller (2563) close to the side plates (2541); A movable rod (25643) is provided on the side plate (2541) and is provided with a second wedge block (25642) on a side close to the pressing roller (2563); A scraper (25644) is provided on a side of the moving rod (25643) away from the pressing roller (2563) and is used to clean the concrete remaining on the support frame.

8. The tunnel boring and spraying machine according to claim 7, characterized in that: The portion of the moving rod (25643) located between the second wedge-shaped block (25642) and the side plate (2541) is sleeved with an elastic member (25646); The second wedge block (25642) is provided with a protective ring (25645) for protecting the elastic member (25646); The protective rings (25645) are two symmetrically arranged semicircular arc structures and are inserted into the through grooves (254101) provided on the side plates (2541).

9. The tunnel boring and spraying machine according to claim 7, characterized in that: The transmission mechanism (2565) comprises: An installation box (25651) is provided on the side panel (2541); A first rack (25652) is provided on the moving rod (25643) and is inserted into a moving groove (2565101) provided on the installation box (25651); A connecting shaft (25653) is arranged inside the installation box (25651); An incomplete gear (25654) is fixed on the connecting shaft (25653) and meshes with the first rack (25652); The second rack (25655) is arranged inside the installation box (25651) and is meshed with the incomplete gear (25654), and one side of the rack passes through the installation box (25651) and is fixedly connected to the center plate (2566).

10. The tunnel boring and spraying machine according to claim 9, characterized in that: A slide rail (256552) is provided inside the installation box (25651), and a limit block (256551) slidably connected to the inside of the slide rail (256552) is provided on one side of the second rack (25655) connected to the slide rail (256552).

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