Fine turning mechanism of shield tunneling machine

Abstract

The utility model belongs to the technical field of shield construction, and particularly relates to a fine direction adjusting mechanism of a shield tunneling machine, which comprises a shield tail ring and an inner ring framework nested in the shield tail ring, four groups of cylinders are distributed in the inner ring framework along a circumferential array, two cylinders in each group are arranged in parallel, and movable grooves are arranged on the outer surface of the shield tail ring opposite to the four groups of cylinders. Arc-shaped steel plates are inserted into openings of the movable grooves, the output ends of the air cylinders extend into the movable grooves and are fixedly connected with the inner arc surfaces of the arc-shaped steel plates, semi-ellipsoid convex teeth are welded to the outer arc surfaces of the arc-shaped steel plates, two silicon rubber sheets are bonded to the two sides of each arc-shaped steel plate, and two concave clamps with outward openings are welded to the two sides of each movable groove; and the lower edges of the silicone rubber sheets extend into the movable grooves and are fixed at the openings of the concave clamps. The utility model can finely adjust the direction up and down and left and right without violent friction with the inner wall of the tunnel, can concentrate the thrust action on the adjusting point, and has good reliability.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield construction, and particularly relates to a fine-tuning mechanism for a shield machine. Background Art

[0002] Shield construction uses a cutterhead and shield as the primary excavation tools, followed by a slurry circulation system, material lifting system, expansive soil system, sewage system, pipe extension device, pressure maintenance system, secondary ventilation system, and supporting electrical cabinets. Due to the complex underground environment, the shield must be turned to avoid dangerous areas.

[0003] Traditional shield machines are equipped with four sets of cylinders: a front propulsion cylinder for synchronous cutterhead propulsion, a rear assembly cylinder for segment assembly, and two central articulated cylinders for directional and attitude control. The coordinated action of the telescopic slide and these four cylinders enables simultaneous shield propulsion and segment assembly, while also enabling continuous adjustment of the shield's attitude to meet turning requirements and tight curve radius requirements.

[0004] In order to reduce the load on the hydraulic system, existing shield machines have abandoned the hydraulic direction adjustment method and instead use single-sided grouting to generate reaction force to achieve fine-tuning. However, there is a gap between the shield body and the tunnel. The injected inert slurry seeps along the gap under the action of its own weight and cannot be concentrated at the slurry outlet, so the reaction force often fails to meet expectations, and the reliability of fine-tuning is low. Utility Model Content

[0005] The utility model aims to provide a shield machine fine-tuning mechanism, which can fine-tune the direction up, down, left, and right without causing severe friction with the inner wall of the tunnel, and can also concentrate the thrust effect on the adjustment point, with good reliability.

[0006] The technical solutions adopted by this utility model are as follows:

[0007] A shield machine fine-tuning mechanism comprises a shield tail ring and an inner ring skeleton nested inside the shield tail ring. Four groups of cylinders are arranged in a circular array inside the inner ring skeleton, with two cylinders in each group arranged in parallel. The outer surface of the shield tail ring facing the four groups of cylinders is provided with movable grooves, and the openings of the movable grooves are inserted with arc-shaped steel plates. The output ends of the cylinders extend into the movable grooves and are fixedly connected to the inner arc surface of the arc steel plates. The outer arc surface of the arc steel plates is welded with semi-ellipsoidal protrusions. When the two cylinders on the left are started, the arc steel plates are extended to support the tunnel, so that the shield machine can move towards Apply thrust to the right, or start the two cylinders on the right to extend the curved steel plate to support the tunnel, applying thrust to the shield machine to the left, or start the two cylinders on the top to extend the curved steel plate to support the tunnel, applying thrust downward for the shield machine, or start the two cylinders on the bottom to extend the curved steel plate to support the tunnel, applying thrust upward for the shield machine, and drive the convex teeth to contact the inner wall of the tunnel. The curved surface of the convex teeth can reduce the friction between the curved steel plate and the inner wall of the tunnel, and can fine-tune the direction up, down, left and right without generating severe friction with the inner wall of the tunnel, and can also concentrate the thrust on the adjustment point, with good reliability.

[0008] As a preferred solution, two silicone rubber sheets are bonded to both sides of the curved steel plate, and two concave clamps with openings facing outwards are welded on both sides of the movable groove. The lower edges of the silicone rubber sheets extend into the movable groove and are fixed at the openings of the concave clamps. When the curved steel plate is extended, the silicone rubber sheet is stretched so that the two silicone rubber sheets block the movable groove from both sides. At this time, the open area of the movable groove is extremely small, which can reduce the sand and gravel falling into the movable groove, and is tightened with the concave clamps to prevent the silicone rubber sheet from breaking. Finally, the silicone rubber sheet is immersed in the movable groove along with the curved steel plate.

[0009] As a preferred solution, the cylinder output ends are all sleeved with alloy tubes, and the end faces of the alloy tubes are fixedly connected to the inner wall of the inner ring frame. When the cylinder output ends are extended or retracted, they are supported and guided by the alloy tubes, and the radial load is removed, and only the axial load of the output end needs to be borne.

[0010] As a preferred solution, a main air pipe connected to the air inlets of the cylinders is provided on the outside of the shield tail ring. The main air pipe is arranged around the central axis of the shield tail ring. One end of the main air pipe is closed and the other end is connected to the air source. The main air pipe can be made of alloy material. The main air pipe is arranged around the central axis of the shield tail ring. The main air pipe is used to connect various solenoid valves, unify the air supply, control the opening and closing of the specified solenoid valve, and start and stop the corresponding cylinders.

[0011] As a preferred solution, the connection between the cylinder output end and the arc-shaped steel plate is also sleeved with an outer sleeve, and the end faces of the outer sleeve are fixedly connected to the inner arc surface of the arc-shaped steel plate. The connection is strengthened by the outer sleeve, so that the connection between the cylinder and the arc-shaped steel plate is tighter and not easy to disconnect.

[0012] As a preferred solution, an annular inner mounting seat is fixed to the end surface of the inner ring skeleton away from the main air pipe.

[0013] As a preferred solution, the air inlet end of the main air pipe is connected to a filter tank and an air compressor in sequence. The air compressor signal is connected to the central control system. The air compressor intermittently draws air into the filter tank. After filtering through activated carbon, the compressed gas is stored inside the filter tank to maintain the air pressure within the set range. When the solenoid valve is opened, air can be supplied to the designated cylinder.

[0014] The technical effects achieved by this utility model are:

[0015] The utility model starts the two cylinders on the left to extend the curved steel plates to support the tunnel, applying thrust to the shield machine to the right, or starts the two cylinders on the right to extend the curved steel plates to support the tunnel, applying thrust to the shield machine to the left, or starts the two upper cylinders to extend the curved steel plates to support the tunnel, applying thrust downward for the shield machine, or starts the two lower cylinders to extend the curved steel plates to support the tunnel, applying thrust upward for the shield machine, and drives the convex teeth to contact the inner wall of the tunnel. The curved surface of the convex teeth can reduce the friction between the curved steel plates and the inner wall of the tunnel, and can fine-tune the direction up, down, left, and right without generating severe friction with the inner wall of the tunnel. It can also concentrate the thrust on the adjustment point, and has good reliability.

[0016] When the curved steel plate is extended, the silicone rubber sheet is stretched so that the two silicone rubber sheets cover the movable groove from both sides. At this time, the opening area of the movable groove is extremely small, which can reduce the sand and gravel falling into the movable groove. The concave clamp is used to tighten the silicone rubber sheet to prevent it from breaking. Finally, the silicone rubber sheet is immersed in the movable groove along with the curved steel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a main view of a shield machine fine-tuning mechanism of the utility model;

[0018] Figure 2 This is a side view of a shield machine fine-tuning mechanism of the utility model;

[0019] Figure 3 This is a front view of the shield tail ring of the utility model;

[0020] Figure 4 This is the front view of the curved steel plate of the utility model configured with two cylinders;

[0021] Figure 5 This is a front view of the curved steel plate of the present invention;

[0022] Figure 6 It is a front view of the cylinder of the present utility model.

[0023] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0024] 1. Shield tail ring; 2. Inner ring frame; 3. Cylinder; 4. Movable groove; 5. Arc steel plate; 6. Protruding teeth; 7. Silicone rubber sheet; 8. Concave clamp; 9. Alloy conduit; 10. Main air pipe; 11. Outer shaft sleeve; 12. Inner mounting seat; 13. Filter tank; 14. Air compressor. DETAILED DESCRIPTION

[0025] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention and does not strictly limit the scope of protection of the present invention.

[0026] In a shield machine, in addition to the cutterhead, the shield body also includes a front body, hydraulic cylinders, manlock, middle body, installer, shield tail and built-in screw feeder. These hydraulic cylinders are distributed in a circular array and are used to push the front body to drive the cutterhead to move horizontally. When necessary, the cutterhead can be rotated to change the inclination angle to achieve the direction of the shield machine. However, in order to reduce the output power required by the hydraulic system, we have improved a new fine-tuning mechanism and abandoned the traditional single-sided grouting to generate reaction force to achieve fine-tuning.

[0027] like Figures 1-6 As shown, a shield machine fine-tuning mechanism includes a shield tail ring 1 and an inner ring skeleton 2 nested inside the shield tail ring 1. Four groups of cylinders 3 are distributed in a circular array inside the inner ring skeleton 2. The four groups of cylinders 3 face the four directions of up, down, left and right respectively. Two cylinders 3 in each group are arranged in parallel. The air intake pipes of the cylinders 3 are connected to solenoid valves, and the solenoid valve signals are connected to the central control system of the shield machine. Movable grooves 4 are provided on the outer surface of the shield tail ring 1 facing the four groups of cylinders 3. The movable grooves 4 have curvatures, and arc-shaped steel plates 5 are inserted at the openings of the movable grooves 4. The output ends of the cylinders 3 extend into the movable grooves 4 and are fixedly connected to the inner arc surface of the arc-shaped steel plate 5. The outer arc surface of the arc-shaped steel plate 5 is welded with semi-ellipsoidal protrusions 6, and the outer surfaces of the protrusions 6 are polished and hardened.

[0028] During straight excavation, the output ends of the four groups of cylinders 3 are retracted, pulling each arc steel plate 5 and the protruding teeth 6 into the movable groove 4, and moving forward along the tunnel along with the shield tail ring 1 and the inner ring skeleton 2.

[0029] According to the design of the construction drawings, when steering is required, the two cylinders 3 on the left are started to extend the curved steel plate 5 to support the tunnel, applying thrust to the shield machine to the right, or the two cylinders 3 on the right are started to extend the curved steel plate 5 to support the tunnel, applying thrust to the shield machine to the left, or the two cylinders 3 on the top are started to extend the curved steel plate 5 to support the tunnel, applying thrust downward for the shield machine, or the two cylinders on the bottom are started to extend the curved steel plate 5 to support the tunnel, applying thrust upward for the shield machine, and driving the convex teeth 6 to contact the inner wall of the tunnel. The curved surface of the convex teeth 6 can reduce the friction between the curved steel plate 5 and the inner wall of the tunnel, and can fine-tune the direction up, down, left and right without generating severe friction with the inner wall of the tunnel. It can also concentrate the thrust on the adjustment point, and has good reliability.

[0030] Refer to the attached Figure 4 、 Figure 5 and Figure 6 Two silicone rubber sheets 7 are bonded on both sides of the curved steel plate 5, and two concave clips 8 with openings facing outward are welded on both sides of the movable groove 4. The lower edges of the silicone rubber sheets 7 extend into the movable groove 4 and are fixed at the openings of the concave clips 8. When the curved steel plate 5 is extended, the silicone rubber sheet 7 is stretched so that the two silicone rubber sheets 7 block the movable groove 4 from both sides. The opening area of the movable groove 4 is extremely small at this time, which can reduce the sand and gravel falling into the movable groove 4, and is tightened with the concave clips 8 to prevent the silicone rubber sheet 7 from breaking. Finally, the silicone rubber sheet 7 is immersed in the movable groove 4 with the curved steel plate 5.

[0031] Refer to the attached Figure 3 、 Figure 4 and Figure 6 The output ends of the cylinders 3 are all sleeved with alloy tubes 9, and the end faces of the alloy tubes 9 are fixedly connected to the inner wall of the inner ring frame 2. When the output ends of the cylinders 3 are extended or retracted, they are supported and guided by the alloy tubes 9, and the radial load is removed, and only the axial load of the output end needs to be borne.

[0032] Refer to the attached Figure 1 and Figure 2 A main air pipe 10 connected to the air inlet of the cylinder 3 is provided on the outside of the shield tail ring 1. One end of the main air pipe 10 is closed, and the other end is connected to the air source. The main air pipe 10 can be made of alloy material. The main air pipe 10 is arranged around the central axis of the shield tail ring 1. The main air pipe 10 is used to connect various solenoid valves, unify the air supply, control the opening and closing of the specified solenoid valve, and start and stop the corresponding cylinder 3.

[0033] Refer to the attached Figure 3 、 Figure 4 and Figure 6 The connection between the output end of the cylinder 3 and the arc-shaped steel plate 5 is also provided with an outer sleeve 11. The outer sleeve 11 is fixedly connected to the output end of the cylinder 3 by screws. The end faces of the outer sleeve 11 are welded to the inner arc surface of the arc-shaped steel plate 5. The connection is strengthened by the outer sleeve 11, so that the connection between the cylinder 3 and the arc-shaped steel plate 5 is tighter and not easy to disconnect.

[0034] Refer to the attached Figure 1 and Figure 2 The end face of the inner ring skeleton 2 away from the main air pipe 10 is fixed with an annular inner mounting seat 12, and the inner mounting seat 12 is preset with a threaded hole for installing the hydraulic cylinder that pushes the cutter disc and separating each cylinder 3 so that the hydraulic cylinder and cylinder 3 work independently.

[0035] Refer to the attached Figure 1 and Figure 2 The air inlet end of the main air pipe 10 is connected to the filter tank 13 and the air compressor 14 in sequence. The air compressor 14 can be a QD110 model air compressor with an input power of 238W and a YUR model motor. The signal of the air compressor 14 is connected to the central control system. The air compressor 14 intermittently draws air into the filter tank 13. After filtering through activated carbon, the compressed gas is stored inside the filter tank 13 to maintain the air pressure within the set range. The solenoid valve is opened to supply air to the specified cylinder 3.

[0036] The working principle of the utility model is as follows: when working, the output ends of the four groups of cylinders 3 are retracted, pulling each arc steel plate 5 and the protruding teeth 6 into the movable groove 4, and moving forward along the tunnel with the shield tail ring 1 and the inner ring skeleton 2.

[0037] Then, the two cylinders 3 on the left are activated to extend the curved steel plates 5 to support the tunnel, applying thrust to the shield machine to the right.

[0038] Or start the two cylinders 3 on the right to extend the arc-shaped steel plate 5 to support the tunnel, applying thrust to the shield machine to the left.

[0039] Or start the two upper cylinders 3 to extend the arc-shaped steel plate 5 to support the tunnel, applying downward thrust to the shield machine.

[0040] Or start the two cylinders 3 at the bottom to extend the arc-shaped steel plate 5 to support the tunnel, thereby applying upward thrust to the shield machine.

[0041] At the same time, the convex teeth 6 are driven to contact the inner wall of the tunnel. The arc surface of the convex teeth 6 can reduce the friction between the arc steel plate 5 and the inner wall of the tunnel. It can fine-tune the direction up and down and left and right without causing severe friction with the inner wall of the tunnel, and can also concentrate the thrust on the adjustment point.

[0042] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention shall, unless otherwise specified or limited, be implemented in accordance with conventional means in the art.

Claims

1. A shield machine fine-tuning mechanism, comprising a shield tail ring (1) and an inner ring skeleton (2) nested inside the shield tail ring (1), characterized in that: Four groups of cylinders (3) are arranged in a circular array inside the inner ring skeleton (2), and two cylinders (3) in each group are arranged in parallel. The outer surface of the shield tail ring (1) is provided with movable grooves (4) at positions facing the four groups of cylinders (3). Arc-shaped steel plates (5) are inserted at the openings of the movable grooves (4). The output ends of the cylinders (3) extend into the movable grooves (4) and are fixedly connected to the inner arc surface of the arc-shaped steel plates (5). The outer arc surface of the arc-shaped steel plates (5) is welded with semi-ellipsoidal protrusions (6).

2. The shield machine fine-tuning mechanism according to claim 1, characterized in that: Two silicone rubber sheets (7) are bonded to both sides of the arc-shaped steel plate (5), and two concave clamps (8) with outward openings are welded to both sides of the movable groove (4). The lower edges of the silicone rubber sheets (7) extend into the movable groove (4) and are fixed at the openings of the concave clamps (8).

3. The shield machine fine-tuning mechanism according to claim 1, characterized in that: The output ends of the cylinders (3) are sleeved with alloy conduits (9), and the end faces of the alloy conduits (9) are fixedly connected to the inner wall of the inner ring skeleton (2).

4. The shield machine fine-tuning mechanism according to claim 1, characterized in that: A main air pipe (10) that is in communication with the air inlet of the cylinder (3) is provided on the outside of the shield tail ring (1), and the main air pipe (10) is arranged around the central axis of the shield tail ring (1).

5. The shield machine fine-tuning mechanism according to claim 1, characterized in that: An outer sleeve (11) is also provided at the connection between the output end of the cylinder (3) and the arc-shaped steel plate (5), and the end surface of the outer sleeve (11) is fixedly connected to the inner arc surface of the arc-shaped steel plate (5).

6. The shield machine fine-tuning mechanism according to claim 4, characterized in that: An annular inner mounting seat (12) is fixed to the end surface of the inner ring skeleton (2) away from the main air pipe (10).

7. The shield machine fine-tuning mechanism according to claim 4, characterized in that: The air inlet end of the main air pipe (10) is connected in sequence to a filter tank (13) and an air compressor (14).

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