Surface layer stripping system for tunnel maintenance

Abstract

The invention discloses a surface stripping system for tunnel maintenance, which comprises an excavator body, a hydraulic system, a control chamber, a telescopic arm, an equipment mounting platform, a dust removal mechanism and a stripping head, the hydraulic system and the control chamber are mounted on the excavator body, the dust removal mechanism and the telescopic arm are respectively mounted on different sides of the control chamber, and the hydraulic system comprises a hydraulic pump, a main control valve and an oil way. By improving oil path distribution, power is provided for the newly added telescopic arm, stripping head and dust removal mechanism under the condition of ensuring stable operation of the original equipment. The work processing capacity of the excavator is improved, functions which can be achieved on the excavator are added in a limited space, an energy supply system of the excavator can meet the use requirements of new function equipment, power output is guaranteed, and an existing excavator can better adapt to surface layer stripping operation of tunnel maintenance.

Description

Technical Field

[0001] The invention relates to engineering machinery and equipment, in particular to a surface stripping system for tunnel maintenance. Background Art

[0002] Tunnels can suffer varying degrees of damage over time. For example, the fire-retardant coating on tunnel walls can become old, ineffective, or even peel off, seriously impacting safe tunnel operations. Therefore, during tunnel maintenance, tunnel walls must be stripped and repaired. Stripping methods can be divided into manual and mechanical stripping. Manual stripping is time-consuming and labor-intensive, and poses the risk of working at height due to the high tunnel ceiling. Mechanical stripping, on the other hand, places high demands on mechanical equipment. Due to the relatively narrow space within the tunnel and the arc-shaped walls, the mechanical equipment's construction angle must be constantly adjusted during the stripping process. Dust from the stripping process cannot be directly discharged and must be collected, requiring more equipment. Prior art has developed dedicated tunnel stripping maintenance equipment to achieve mechanical stripping. For example, Chinese invention application publication CN116971562A discloses a tunnel maintenance device, and Chinese utility model publication CN222045763U discloses a tunnel inner wall leveling device. However, since both are specialized equipment, their production costs are high and their use is limited, making them difficult to commercialize.

[0003] Existing excavator equipment is developing in the direction of multi-functions, and excavators are general-purpose mechanical equipment. Compared with special equipment for tunnel maintenance, they are cheaper and easier to obtain. Improving the excavator to achieve surface stripping for tunnel maintenance is an effective solution to the above-mentioned technical problems. However, due to the relatively compact structure of the excavator, there is less space for installing new equipment on the excavator. Therefore, realizing new functions on the original excavator requires effective utilization of its spatial layout and selection of new equipment with suitable structure; secondly, the main control valve of the original excavator has limited oil circuits reserved. The lack of oil circuits makes it difficult to operate multiple newly added equipment at the same time after the modification. If all equipment cannot be integrated on the same excavator during construction, due to the relatively small space in the tunnel, the coordinated operation of multiple equipment is likely to cause congestion, making mechanical construction difficult; in addition, the excavator's oil circuit is set according to the working needs of the original excavator. Therefore, the setting of the new equipment needs to meet the requirements of the excavator's energy supply system and reasonably distribute energy according to its functional characteristics. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a surface stripping system for tunnel maintenance, which improves the working processing capacity of the excavator, increases the functions that can be realized on the excavator within a limited space, and enables the energy supply system of the excavator to adapt to the use requirements of new functional equipment, ensures power output, and enables existing excavators to better adapt to the surface stripping operations of tunnel maintenance.

[0005] The present invention achieves the above-mentioned object through the following technical solutions: A surface stripping system for tunnel maintenance, comprising an excavator body, a hydraulic system, and a control room, wherein the hydraulic system and the control room are mounted on the excavator body, wherein: a first oil cylinder and a telescopic arm are provided on one side of the control room, the fixed end of the telescopic arm is rotatably mounted on the excavator body, and the first oil cylinder drives the telescopic arm to rotate; a second oil cylinder is provided on the telescopic arm, and the second oil cylinder drives the telescopic arm to extend and retract; a stripping head and a third oil cylinder are installed on the movable end of the telescopic arm, the stripping head is rotatably connected to the movable end of the telescopic arm, and the third oil cylinder drives the stripping head to rotate vertically; a first motor is provided in the stripping head, and the first motor drives the stripping head to operate; a dust removal mechanism is provided on the other side of the control room, and a second motor is provided in the dust removal mechanism, and the second motor drives the dust removal mechanism to absorb dust; The hydraulic system includes a hydraulic pump, a main control valve, and an oil circuit. The hydraulic pump is connected to the main control valve, and the main control valve supplies energy to the first cylinder, the second cylinder, the third cylinder, the first motor, and the second motor respectively through the oil circuit.

[0006] By improving the original excavator so that it can meet the needs of surface stripping and dust removal in tunnels, and the above functions can be powered by the oil circuit structure of the original excavator, the application of excavators in tunnel maintenance is realized with high integration.

[0007] As a further optimization scheme of the present invention, the hydraulic system also includes a double valve, the oil circuit includes a first oil circuit, a second oil circuit, a third oil circuit, and a fourth oil circuit, the main control valve is connected to the first oil cylinder through the first oil circuit; the main control valve is connected to the double valve through the second oil circuit, and the double valve is connected to the second oil cylinder and the third oil cylinder; the main control valve is connected to the first motor through the third oil circuit, the third oil circuit has a merging function, and the main control valve is connected to the second motor through the fourth oil circuit. The main control valve of an existing excavator can generally be used for 7 oil circuits, of which 3 oil circuits are used for the movement of the excavator body, namely the left travel motor, the right travel motor and the rotary motor. Therefore, there are only 4 oil circuits that can be used to realize the functions, of which 5 working parts need to be moved, namely the rotation of the telescopic arm, the extension and retraction of the telescopic arm, the vertical rotation of the stripping head, and the operation of the stripping head and the dust removal mechanism. The problem of insufficient oil circuits is solved by adding a double valve, but the use of a double valve will cause pressure and flow diversion problems. Therefore, the second oil cylinder (i.e. the extension and retraction movement of the telescopic arm) and the third oil cylinder (i.e. the vertical rotation of the stripping head) are arranged after the double valve. This takes into account that the second oil cylinder and the third oil cylinder are both set close to the telescopic arm without increasing the complexity of the oil circuit, and also takes into account the pressure and flow required for the use of the second oil cylinder and the third oil cylinder separately and simultaneously. The third oil circuit has a merging function to enable the first motor to obtain the maximum flow and the output torque is stable, thereby ensuring that all equipment on the excavator can work together.

[0008] As a further optimization of the present invention, the stripping head is a milling head, comprising a milling head bracket, an adaptive inclination adjustment component, a milling drum, and a limiting wheel. The milling drum bracket is horizontally rotatably mounted on the telescopic arm via the adaptive inclination adjustment component, the milling drum is rotatably mounted on the milling head bracket, the first motor is driven and connected to the milling drum, and the limiting wheels are mounted on both sides of the milling drum and located on the milling drum bracket. The adaptive inclination adjustment component ensures that, in the absence of an additional power source, the milling head bracket can achieve autonomous left and right swinging according to the amount of pressure.

[0009] A further optimized solution is that the inclination angle adaptive adjustment component includes a connecting plate, a first connecting block, and a second connecting block. One end of the connecting plate is vertically connected to the telescopic arm, and the other end is horizontally connected to the first connecting block. The first and second connecting blocks are triangular in shape, with the corners of the first and second connecting blocks facing each other and connected in rotation. The first and second connecting blocks are connected on both sides by a damping cylinder, and the second connecting block is connected to the milling head bracket. The arrangement of the connecting plate enables the milling head bracket to swing both vertically and horizontally relative to the telescopic arm. The shape and connection method of the first and second connecting blocks enable a larger horizontal swing angle.

[0010] As a further optimization of the present invention, the dust removal mechanism includes a swirl barrel, a dust removal box, and an air duct. The inlet of the air duct is provided on the stripping head, the outlet of the air duct is connected to the feed inlet of the swirl barrel, the dust inlet of the dust removal box is connected to the dust outlet of the swirl barrel, and the second motor is mounted on the dust removal box. Because the stripping process generates larger particles and dust, and the dust removal mechanism that can be installed in an excavator is limited in size, it is necessary to discharge the larger particles through the swirl barrel, and collect the dust in the dust removal box. In addition, due to the limited oil circuit of the excavator, negative pressure is generated simultaneously for the swirl barrel, dust removal box, and air duct only by the second motor.

[0011] A further optimized solution is described, wherein the swirl barrel comprises a barrel body and a connecting pipe. The barrel body is provided with a feed port, a first discharge port, and a dust outlet. The feed port is located on the side of the barrel body, the first discharge port is located on the bottom of the barrel body, and the dust outlet is located at the top of the barrel body. One end of the connecting pipe is inserted into the barrel body through the dust outlet, and the other end of the connecting pipe is connected to the dust inlet of the dust removal box. Since the first discharge port is located on the bottom of the barrel body, larger particles are automatically discharged from the first discharge port under the action of gravity. The connecting pipe is inserted into the barrel body from the top, and the dust enters the dust removal box under the action of suction.

[0012] A further optimized solution is that the dust removal box includes a box body, a filter element, and an exhaust wheel. The box body is provided with a dust inlet, an exhaust port, and two discharge ports. The dust inlet is connected to the swirl barrel, the filter element is installed in the box body, the exhaust wheel is connected to the exhaust port, and the second motor is connected to the exhaust wheel. The second discharge port is provided on the bottom surface of the box body. The filter element collects dust, preventing it from being discharged into the air during construction. At the same time, the location of the second discharge port on the bottom surface of the box body allows some particles that are sucked into the swirl barrel but cannot be absorbed by the filter element to be discharged in a timely manner without causing aggregation.

[0013] In a further optimization solution, the dust removal box also includes an air compressor and an air storage bag, with the air inlet of the air storage bag connected to the air compressor and the air outlet of the air storage bag connected to the filter element. By providing the air compressor and air storage bag, the filter element can be backflushed and cleaned, and dust adsorbed on the filter element can be discharged in an environment where dust can be discharged, thereby ensuring the adsorption capacity of the filter element.

[0014] As a further optimization, dust bags made of an elastic material are installed at the first and second outlets. By installing the elastic dust bags, when the exhaust wheel generates negative pressure, the pressure inside the box and barrel is lower than the external pressure, and the dust bags automatically close to ensure suction and allow larger debris to fall through the dust bags.

[0015] As a further optimization of the present invention, an equipment mounting platform is further included, the dust removal mechanism being fixedly mounted on the equipment mounting platform, the equipment mounting platform being horizontally mounted on the excavator body, and support legs being provided at one end of the equipment mounting platform remote from the excavator body, the support legs being retractably mounted on the equipment mounting platform. The provision of the equipment mounting platform increases the excavator's loading capacity, while the provision of the support legs ensures that the excavator will not tip over due to a rearward shift in its center of gravity caused by the addition of the equipment mounting platform and the dust removal mechanism during operation. Beneficial effects

[0016] 1. By improving the original excavator to enable it to meet the needs of surface stripping and dust removal in the tunnel, the application of excavators in tunnel maintenance is realized with high integration.

[0017] 2. The oil circuit modification ensures that all equipment on the excavator can work together.

[0018] 3. The specific structure of the stripping head, telescopic arm and dust removal mechanism makes it more suitable for existing excavators and can achieve better functional effects in tunnel maintenance scenarios.

[0019] 4. The equipment installation platform provides additional installation space for the excavator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the surface peeling system of the present invention; Figure 2 A side view of the surface peeling system of the present invention; Figure 3 This is a schematic diagram of the telescopic arm structure of the present invention; Figure 4 This is a schematic diagram of the hydraulic system oil circuit of the present invention; Figure 5 This is a schematic diagram of the hydraulic system connection of the present invention; Figure 6 This is a schematic structural diagram of the milling head of the present invention; Figure 7 This is a schematic diagram of the connection between the milling head and the telescopic arm structure of the present invention; Figure 8 This is a schematic diagram of the swirl barrel structure of the present invention; Figure 9 This is a schematic diagram of the dust removal box structure of the present invention; Figure 10 Schematic diagram of the dust removal mechanism structure of the present invention; Figure 11 This is a rear view of the surface peeling system of the present invention; 1- Excavator body, 2-Hydraulic system, 21-Hydraulic pump, 22-Main control valve, 23-Double valve, 24-First oil circuit, 25-Second oil circuit, 26-Third oil circuit, 27-Fourth oil circuit, 28-Fifth oil circuit, 29-Sixth oil circuit, 30-Seventh oil circuit, 4-First oil cylinder, 6-Second oil cylinder, 8-Third oil cylinder, 9-First motor, 12-Second motor, 31-Left travel motor, 32-Right travel motor, 33-Slewing motor, 3-Control room, 5-telescopic arm, 51-movable end, 52-fixed end, 7-stripping head, 71-milling head bracket, 72-inclination adaptive adjustment component, 721-connecting plate, 722-first connecting block, 723-second connecting block, 73-milling drum, 74-limiting wheel, 10-Equipment installation platform, 101-Support feet, 11-dust removal mechanism, 111-swirl barrel, 112-dust removal box, 113-air duct, 114-barrel body, 115-connecting pipe, 1141-feeding port, 1142-discharge port 1, 1143-dust outlet, 1121-box body, 1122-filter element, 1123-exhaust wheel, 1124-air compressor, 1125-air storage bag, 1126-dust inlet, 1127-exhaust port, 1128-discharge port 2. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content. Example

[0022] like Figure 1 、 Figure 2 The surface stripping system for tunnel maintenance shown in the figure includes an excavator body 1, a hydraulic system 2, and a control room 3. The hydraulic system 2 and the control room 3 are installed on the excavator body 1, wherein the control room 3 is located at the front of the excavator body 1. A first oil cylinder 4 and a telescopic arm 5 are provided on one side of the control room 3 at the front of the excavator body 1. The telescopic arm 5 is driven by the first oil cylinder 4 to rotate up and down. A dust removal mechanism 11 is provided on the other side of the control room 3 at the rear of the excavator body 1.

[0023] like Figure 3As shown, the telescopic arm 5 includes a movable end 51 and a fixed end 52. One end of the fixed end 52 is rotatably mounted on the excavator body 1. The first cylinder 4 is connected to the fixed end 52. A second cylinder 6 is provided on the telescopic arm 5. The second cylinder 6 is installed in the fixed end 52 to control the extension and retraction of the movable end 51 relative to the fixed end 52. A stripping head 7 and a third cylinder 8 are rotatably mounted on the movable end 51 of the telescopic arm 5. The third cylinder 8 drives the stripping head 7 to rotate up and down. A first motor 9 is provided in the stripping head 7 to drive the stripping head 7.

[0024] like Figure 4 、 Figure 5As shown, the excavator's engine drives the hydraulic system 2, which includes a hydraulic pump 21, a main control valve 22, and oil circuits. The engine is connected to the hydraulic pump 21, which is in turn connected to the main control valve 22. The main control valve 22 supplies energy to all cylinders and motors through oil circuits. The excavator's main control valve 22 provides access to seven oil circuits, three of which are used for the movement of the excavator body 1: a left travel motor 31 connected via a fifth oil circuit 28, a right travel motor 32 connected via a sixth oil circuit 29, and a swing motor 33 connected via a seventh oil circuit 30. The left travel motor 31, right travel motor 32, and swing motor 33 collectively control the excavator's movement. The remaining four oil circuits control the movement of five working components: the rotation and extension of the telescopic arm 5, the vertical rotation of the stripping head 7, and the operation of the stripping head 7 and the dust removal mechanism 11. To ensure that more equipment can be powered, the hydraulic system 2 also includes a double valve 23. The double valve 23 can split a single oil circuit into two, allowing a single oil circuit to power more equipment. The oil circuit includes a first oil circuit 24, a second oil circuit 25, a third oil circuit 26, and a fourth oil circuit 27. The main control valve 22 is connected to the first oil cylinder 4 via the first oil circuit 24 to control its operation, thereby achieving the vertical rotation of the telescopic arm 5. The main control valve 22 is connected to the double valve 23 via the second oil circuit 25. The two ends of the double valve 23 are respectively connected to the second oil cylinder 6 and the third oil cylinder 8, supplying oil to the second and third oil cylinders 6 and 8, thereby controlling the extension and retraction of the telescopic arm 5 and the vertical rotation of the stripping head 7. The main control valve 22 is connected to the first motor 9 via the third oil circuit 26 to control the operation of the stripping head 7. The main control valve 22 is connected to the second motor 12 via the fourth oil circuit 27 to control the dust removal of the dust removal mechanism 11. Among them, the first cylinder 4 adopts the original boom cylinder oil circuit of the excavator, and the second cylinder 6 and the third cylinder 8 adopt the original bucket cylinder oil circuit of the excavator. The problem of insufficient oil circuit is solved by adding a double valve 23. At the same time, the second cylinder 6 and the third cylinder 8 are both arranged close to the telescopic arm 5, which will not increase the complexity of the oil circuit. It also takes into account that the pressure and flow required for the second cylinder 6 and the third cylinder 8 to be used separately and simultaneously can be achieved through one oil circuit. In addition, the first motor 9 uses the original arm oil circuit for the milling motor, and uses the original arm confluence function to enable the milling motor to obtain the maximum flow and stable output torque. The second motor 12 uses the original excavator optional oil circuit for the dust removal motor, and distributes a more stable flow to the dust removal motor through the valve body itself.

[0025] In this embodiment, the stripping head 7 is a milling head, and in other embodiments it can also be set as a chiseling head. Figure 6 、 Figure 7As shown, the milling head includes a milling head bracket 71, an adaptive inclination adjustment component 72, a milling drum 73, and a limiting wheel 74. The milling drum bracket 71 is rotatably mounted on the telescopic arm 5 via the adaptive inclination adjustment component 72, and can be rotated horizontally to adjust the angle. The milling drum 73 is rotatably mounted on the milling head bracket 71. The first motor 9 drives and connects to the milling drum 73, providing power for the rotation of the milling drum 73. The limiting wheels 74 are mounted on both sides of the milling drum 73 and are fixed to the milling head bracket 71. When targeting different stripping depths, the limiting wheels of different diameters can be replaced. The limiting wheels abut against the wall surface, thereby controlling the stripping depth of the milling drum.

[0026] The inclination adaptive adjustment component 72 includes a connecting plate 721, a first connecting block 722, and a second connecting block 723. There are two connecting plates 721, one end of which rotates vertically to connect to the telescopic arm 5, and the other end rotates horizontally to connect to the first connecting block 722. The first connecting block 722 and the second connecting block 723 are both composed of three plates, including a base plate and two triangular plates arranged perpendicular to the base plate. The corners of the two triangular plates of the first connecting block 722 and the second connecting block 723 are hinged to each other. The two sides of the base plates of the first connecting block 722 and the second connecting block 723 are connected by a damping cylinder, and the second connecting block 723 is connected to the milling head bracket 71.

[0027] like Figure 7 and 10 As shown, the dust removal mechanism 11 includes a swirl barrel 111, a dust box 112, and an air duct 113. The inlet of the air duct 113 is located below the stripping head 7, and the debris stripped by the stripping head 7 is sucked into the air duct 113. The dust inlet 1126 of the dust box 112 is connected to the dust outlet 1143 of the swirl barrel 111. The second motor 12 is mounted on the dust box 112. When the second motor 12 is turned on, a negative pressure is created at the inlet of the air duct 113 from the dust box 112 to the air duct 113, thereby sucking in the stripped debris.

[0028] like Figure 8 As shown, the swirl barrel 111 includes a barrel body 114 and a connecting pipe 115. The barrel body 114 is provided with a feed port 1141, a discharge port 1142, and a dust outlet 1143. The feed port 1141 is located on the side of the barrel body 114, the discharge port 1142 is located on the bottom surface of the barrel body 114, and the dust outlet 1143 is located on the top surface of the barrel body 114. The air duct 113 is connected to the feed port 1141. One end of the connecting pipe 115 is downwardly inserted into the dust outlet 1143, and the other end of the connecting pipe 115 is connected to the dust removal box 112. During operation, the barrel body 114 is in a negative pressure state, waste enters the barrel body 114, larger waste particles fall from the discharge port 1142, and dust or smaller waste particles enter the dust removal box 112 through the connecting pipe 115 under the suction force of the second motor 12.

[0029] like Figure 9As shown, the dust removal box 112 includes a box body 1121, a filter element 1122, an exhaust wheel 1123, and an air compressor 1124 (see Figure 11 ), air storage bag 1125. Dust inlet 1126, air outlet 1127, and second discharge port 1128 are provided on housing 1121. Air inlet 1124 is connected to swirl barrel 111 via connecting pipe 115. Filter element 1122 is installed within the housing to absorb dust. Exhaust wheel 1123 is installed at exhaust port 1127. Second motor 12 is connected to exhaust wheel 1123, driving it to rotate, creating a negative pressure state within barrel 114 and housing 1121. Second discharge port 1128 is provided on the bottom surface of housing 1121 to prevent the inhalation of larger waste materials that cannot be discharged. It also serves to discharge dust absorbed by filter element 1122. The air inlet of air storage bag 1125 is connected to air compressor 1124, which compresses air into air storage bag 1125. The air outlet of air storage bag 1125 is connected to housing 1121 and is aligned with filter element 1122. When filter element 1122 becomes overloaded with dust and cannot continue to absorb it, the compressed air in the air storage bag is ejected to clean filter element 1122. Air compressor 1124 and air storage bag 1125 are controlled and powered by the circuit system on excavator body 1.

[0030] In this embodiment, dust collecting bags are provided at discharge port 1142 and discharge port 2 1128. The dust collecting bags are made of windproof and elastic material. When the exhaust wheel 1127 generates negative pressure, since the pressure inside the box body 1121 and the barrel body 114 is lower than the external pressure, the dust collecting bags will automatically close to ensure the suction at the entrance of the air duct 113. At the same time, larger fragments can fall from the dust collecting bags, so that the barrel body 114 and the box body 1121 are in a negative pressure state during operation, and large particles of impurities can be discharged from discharge port 1 1142 and discharge port 2 1128.

[0031] like Figure 2 and 11 As shown, an equipment installation platform 10 is provided on the other side of the control room 3 at the rear of the excavator body 1. The equipment installation platform 10 is horizontally mounted on the excavator body 1 and can be used to install various equipment. In this embodiment, a dust removal mechanism 11 is provided on the equipment installation platform 10. Support legs 101 are provided at the rear of the equipment installation platform 10, and the support legs 101 are retractably mounted on the bottom surface of the equipment installation platform 10. Since the installation of the equipment installation platform 10 and the dust removal mechanism 11 shifts the center of gravity of the excavator backward, the provision of the support legs 101 can effectively prevent the excavator from tipping over due to the constantly changing angle of the telescopic arm 5 during construction.

[0032] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Any modifications and improvements made to the technical solution of the present invention by a person of ordinary skill in the art without departing from the design concept of the present invention shall fall within the scope of protection of the present invention. The technical content for which protection is sought in the present invention is fully set forth in the claims.

Claims

1. A surface stripping system for tunnel maintenance, comprising an excavator body, a hydraulic system, and a control room, wherein the hydraulic system and the control room are mounted on the excavator body, and characterized in that: A first oil cylinder and a telescopic arm are provided on one side of the control room. The fixed end of the telescopic arm is rotatably mounted on the excavator body, and the first oil cylinder drives the telescopic arm to rotate; a second oil cylinder is provided on the telescopic arm, and the second oil cylinder drives the telescopic arm to extend and retract; a stripping head and a third oil cylinder are installed on the movable end of the telescopic arm, and the stripping head is rotatably connected to the movable end of the telescopic arm, and the third oil cylinder drives the stripping head to rotate vertically; a first motor is provided in the stripping head, and the first motor drives the stripping head to operate; a dust removal mechanism is provided on the other side of the control room, and a second motor is provided in the dust removal mechanism, and the second motor drives the dust removal mechanism to absorb dust; The hydraulic system includes a hydraulic pump, a main control valve, and an oil circuit. The hydraulic pump is connected to the main control valve, and the main control valve supplies energy to the first cylinder, the second cylinder, the third cylinder, the first motor, and the second motor respectively through the oil circuit.

2. The surface stripping system for tunnel maintenance according to claim 1, characterized in that: The hydraulic system also includes a double valve, the oil circuit includes a first oil circuit, a second oil circuit, a third oil circuit, and a fourth oil circuit, the main control valve is connected to the first oil cylinder through the first oil circuit; the main control valve is connected to the double valve through the second oil circuit, and the double valve is connected to the second oil cylinder and the third oil cylinder; the main control valve is connected to the first motor through the third oil circuit, the third oil circuit has a merging function, and the main control valve is connected to the second motor through the fourth oil circuit.

3. The surface stripping system for tunnel maintenance according to claim 1, characterized in that: The stripping head is a milling head, which includes a milling head bracket, an inclination adaptive adjustment component, a milling drum, and a limiting wheel. The milling drum bracket is horizontally rotatably mounted on the telescopic arm through the inclination adaptive adjustment component. The milling drum is rotatably mounted on the milling head bracket. The first motor drives the milling drum. The limiting wheels are mounted on both sides of the milling drum and are located on the milling drum bracket.

4. The surface stripping system for tunnel maintenance according to claim 3, characterized in that: The inclination adaptive adjustment component includes a connecting plate, a first connecting block, and a second connecting block. One end of the connecting plate is vertically rotated to connect to the telescopic arm, and the other end is horizontally rotated to connect to the first connecting block. The first connecting block and the second connecting block are triangular. The corners of the first connecting block and the second connecting block are relative and rotatably connected. The two sides of the first connecting block and the second connecting block are connected by a damping cylinder. The second connecting block is connected to the milling head bracket.

5. The surface stripping system for tunnel maintenance according to claim 1, characterized in that: The dust removal mechanism includes a swirl barrel, a dust removal box, and an air duct. The inlet of the air duct is arranged on the stripping head, the outlet of the air duct is connected to the feed port of the swirl barrel, the dust inlet of the dust removal box is connected to the dust outlet of the swirl barrel, and the second motor is installed on the dust removal box.

6. The surface stripping system for tunnel maintenance according to claim 5, characterized in that: The swirl barrel includes a barrel body and a connecting pipe. The barrel body is provided with a feed port, a discharge port 1, and a dust outlet. The feed port is opened on the side of the barrel body, the discharge port 1 is opened on the bottom surface of the barrel body, and the dust outlet is opened at the top of the barrel body. One end of the connecting pipe is inserted into the barrel body through the dust outlet, and the other end of the connecting pipe is connected to the dust inlet of the dust removal box.

7. The surface stripping system for tunnel maintenance according to claim 6, characterized in that: The dust removal box includes a box body, a filter element, and an exhaust wheel. The box body is provided with a dust inlet, an exhaust port, and two discharge ports. The dust inlet is connected to the swirl barrel. The filter element is installed in the box body. The exhaust wheel is connected to the exhaust port. The second motor is connected to the exhaust wheel. The second discharge port is opened on the bottom surface of the box body.

8. The surface stripping system for tunnel maintenance according to claim 7, characterized in that: The dust removal box further includes an air compressor and an air storage bag. The air inlet of the air storage bag is connected to the air compressor, and the air outlet of the air storage bag is connected to the filter element.

9. The surface stripping system for tunnel maintenance according to claim 7, characterized in that: Dust collecting bags are provided at the first discharge port and the second discharge port, and the dust collecting bags are made of elastic material.

10. The surface stripping system for tunnel maintenance according to claim 1, characterized in that: It also includes an equipment installation platform, the dust removal mechanism is fixedly installed on the equipment installation platform, the equipment installation platform is horizontally installed on the excavator body, and the equipment installation platform is provided with a support foot at one end away from the excavator body, and the support foot is retractably installed on the equipment installation platform.

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