A shield machine front-end gate

Abstract

The invention relates to a shield machine front end gate, comprising a valve body with a flow channel, the valve body having a track groove inside; a gate plate, which is inserted on the valve body and can move up and down by a driving mechanism; characterized in that: it further comprises a discharge cavity, which is located below the track groove and is communicated; a flap, which is rotatably installed in the valve body through a rotating shaft, the turning of the flap can make the track groove and the discharge cavity communicated or blocked; a cleaning push plate, which is arranged in the discharge cavity and can move left and right, in the state that the cleaning push plate is located in the discharge cavity, the cleaning push plate supports the flap in the horizontal position and prevents it from turning, and the flap is located in the position that blocks the communication between the track groove and the discharge cavity; in the state that the cleaning push plate slides out of the discharge cavity, the flap can turn to the position that makes the track groove and the discharge cavity communicated; the left and right movement of the cleaning push plate can discharge the mud in the discharge cavity. The gate can discharge the mud and rocks in the track groove when the gate plate is closed.

Description

Technical Field

[0001] This invention belongs to the field of shield machine valve technology, and particularly relates to a front gate of a shield machine. Background Technology

[0002] A tunnel boring machine (TBM) is a specialized engineering machine used for tunnel excavation. It is a tunnel construction device that uses a cutterhead to cut soil under the protection of a shield to excavate tunnels, while simultaneously using a screw conveyor or other means to transport excavated soil and a lining machine to perform lining operations. TBMs are widely used in tunnel construction due to their safety, efficiency, and economy.

[0003] In existing technology, tunnel boring machines (TBMs) typically have a gate installed on the sealing partition behind the cutterhead. During operation, the gate opens, allowing the slurry cut by the cutterhead to flow through the gate to the sealing partition, and then be discharged by a screw conveyor, ensuring normal excavation work. During equipment maintenance, the gate needs to be closed to maintain pressure at the excavation face while allowing maintenance behind the sealing partition. Currently, the front gate of a TBM generally uses a gate valve, as disclosed in Chinese invention patent CN201510963192.0 (publication number CN105464673A), "A Front Gate Device for a Screw Conveyor of a TBM." However, when the gate valve is open, the track groove that mates with the gate plate is exposed to the slurry, causing large pieces of gravel to accumulate in the groove. When the gate valve closes, the gate plate cannot completely close because it is pressed against the gravel in the track groove, resulting in leakage.

[0004] In conclusion, the existing shield tunneling machine front gate can be further improved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a shield machine front gate with a reasonable structure that discharges mud and gravel from the track trench when the gate is closed, in view of the above-mentioned existing technology.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a shield tunneling machine front gate, comprising...

[0007] The valve body has a flow channel that runs through the front and back, and the bottom of the valve body has a track groove.

[0008] A gate is inserted into the valve body and driven by a drive mechanism to move up and down. The upward movement of the gate can disengage from the track groove and open the flow channel, while the downward movement of the gate can insert into the track groove and close the flow channel.

[0009] Its characteristic is that it also includes:

[0010] The discharge chamber is located at the bottom of the valve body and below and connected to the track groove;

[0011] The flap is installed in the valve body by rotating the shaft and is located between the track groove and the discharge chamber. The flipping of the flap can make the track groove and the discharge chamber connect or block.

[0012] The cleaning push plate is located inside the discharge chamber and can move left and right. When the cleaning push plate is in the discharge chamber, it supports the horizontally positioned flap to prevent it from flipping over, and the flap is in a position that blocks the connection between the track groove and the discharge chamber. When the cleaning push plate slides out of the discharge chamber, the flap is no longer supported by the cleaning push plate and can flip over to a position that connects the track groove and the discharge chamber. The left and right movement of the cleaning push plate can discharge the mud located in the discharge chamber.

[0013] As a further improvement, a one-way valve is installed at the right end outlet of the discharge chamber, allowing only the slurry to be discharged from the right end outlet of the discharge chamber. The one-way valve prevents slurry from flowing back into the discharge chamber from the outside through the right end outlet.

[0014] In a further improvement, a control shaft is fixed to the outer end of the aforementioned rotating shaft. A straight groove and a spiral groove are formed on the outer peripheral wall of the control shaft. The spiral groove is located at the left end of the straight groove and communicates with it. The straight groove passes through the right end face of the control shaft sleeve. A drive protrusion matching the straight groove and spiral groove is provided on the cleaning push plate. When the cleaning push plate slides to the left out of the discharge chamber, the drive protrusion is located in the straight groove. The gate plate just enters the track groove. The cleaning push plate moves further to the left. With the cooperation of the drive protrusion and the spiral groove, the flap flips with the rotating shaft and the control shaft, so that the track groove and the discharge chamber are connected.

[0015] The aforementioned scheme uses a control shaft to rotate a flap, and a straight groove and a spiral groove are provided on the control shaft. This allows the drive protrusion on the cleaning push plate to slide within the spiral and straight tracks. At the start of the gate opening process, the control shaft rotates first and then stops to position itself, causing the flap to first block and position the track groove and discharge chamber. Then, the cleaning push plate enters the discharge chamber and moves to the right to push out the waste. During the gate closing process, as the cleaning push plate slides to the left out of the discharge chamber, the drive protrusion is located in the straight groove. Simultaneously, as the gate enters the track groove, the cleaning push plate moves further to the left. With the drive protrusion and spiral groove working together, the flap rotates with the shaft and control shaft, connecting the track groove and discharge chamber. This causes the control shaft to first position itself and then rotate, so that the flap does not rotate during the gate's descent but rotates after the gate enters the track groove, connecting the track groove and discharge chamber, allowing the slurry in the track groove to be pushed into the discharge chamber. It uses a mechanical control system to rotate the flap as needed, eliminating the need for an additional motor, resulting in low cost. The entire working process is simple and straightforward, and easy to control.

[0016] Preferably, the gate is driven to move up and down by an electric push rod mounted on the valve body. Alternatively, it can be driven by a hydraulic cylinder.

[0017] In a further improvement, the gate is connected to the cleaning push plate via a transmission structure. When the gate moves downward, it drives the cleaning push plate to the left via the transmission structure; when the gate moves upward, it drives the cleaning push plate to the right via the transmission structure. This design directly links the up-and-down movement of the gate with the left-and-right movement of the cleaning push plate, eliminating the need for additional control mechanisms to drive the cleaning push plate. This results in a compact and simple overall structure.

[0018] As a preferred embodiment, the above-mentioned transmission structure includes

[0019] The control lever is fixed to one side of the gate and extends downward.

[0020] The vertically arranged first belt drive assembly includes two first pulleys spaced apart vertically and installed on the left side of the valve body. The two first pulleys are connected by a first belt, and the control rod is fixed to the first belt.

[0021] The mounting bracket is fixed to the bottom of the valve body;

[0022] The inclined second belt drive assembly includes two second pulleys and a second belt connecting the two second pulleys. One of the second pulleys is coaxially spaced from the first pulley located below and can rotate synchronously. The other second pulley is mounted on a fixed frame and located to the left of the first pulley.

[0023] The third belt drive assembly arranged laterally includes two third pulleys spaced apart on the fixed frame and a third belt connecting the two third pulleys. One of the third pulleys is coaxially spaced with the second pulley located below and can rotate synchronously, while the other third pulley is located to the right of the first pulley.

[0024] The movable frame is constrained to the fixed frame by a lower slide rail at its lower part and to the cleaning push plate by an upper slide rail at its upper part, so that the movable frame can move left and right relative to the bottom of the valve body and the cleaning push plate.

[0025] The fourth belt drive assembly is arranged horizontally, including two fourth pulleys spaced apart on the movable frame and a fourth belt connecting the two fourth pulleys. The fixed frame is fixed to the lower part of the fourth belt, the cleaning push plate is fixed to the upper part of the fourth belt, and the movable frame is fixed to the upper part of the third belt.

[0026] This transmission mechanism mainly consists of four belt drive groups, with a control lever installed on the gate. The belt drive group only includes pulleys and belts, which is simple in structure and low in cost. When the gate is opened and closed, it can drive the belt to move through the control lever, which in turn drives the pulley to rotate. Since the pulley rotates, it can drive the belt and the moving frame to move, which ultimately drives the cleaning push plate to perform the material discharge action.

[0027] Compared with the prior art, the advantages of the present invention are as follows: By setting up a flapper, a discharge chamber, and a cleaning pusher, when the gate is open, the flapper cooperates with the valve body to prevent the slurry in the valve body from entering the discharge chamber. When the gate is closed and just after the gate enters the track groove, the flapper rotates to connect the track groove and the discharge chamber, pushing the slurry in the track groove into the discharge chamber, allowing the gate to continue moving downward and to move into position to form a stable seal with the valve body, preventing leakage. After the gate is opened and leaves the track groove, the flapper rotates to the position that blocks the connection between the track groove and the discharge chamber, and the cleaning pusher continues to move to the right in the discharge chamber, pushing the slurry in the discharge chamber to be discharged from the valve body through the one-way valve. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the gate of the present invention when it is open;

[0029] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0030] Figure 3 This is a three-dimensional schematic diagram of the control axis in this invention.

[0031] Figure 4 This is a cross-sectional view of the present invention when the gate is about to rotate, causing the flap to rotate and blocking the track groove and discharge chamber;

[0032] Figure 5 for Figure 4 Cross-sectional view along the BB direction;

[0033] Figure 6 This is a cross-sectional view of the gate of the present invention when it is open;

[0034] Figure 7 for Figure 6 A cross-sectional view along the CC direction;

[0035] Figure 8 for Figure 7 A cross-sectional view along the DD direction. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] like Figures 1-8 The image shown is a preferred embodiment of the present invention.

[0038] A shield tunneling machine front gate, including

[0039] A valve body 1 has a flow channel 1a that runs through the front and back, and a track groove 1b is provided at the bottom of the valve body 1.

[0040] Gate 2, inserted into valve body 1 and driven by a drive mechanism, can move up and down. When gate 2 moves upward, it disengages from track groove 1b and opens the flow channel 1a. When gate 2 moves downward and inserts into track groove 1b, it closes the flow channel 1a. Gate 2 is driven up and down by an electric push rod 10 mounted on valve body 1.

[0041] The discharge chamber 1c is located at the bottom of the valve body 1 and is below and connected to the track groove 1b; a one-way valve 12 is provided at the right end outlet of the discharge chamber 1c, which only allows mud to be discharged from the right end outlet X of the discharge chamber 1c.

[0042] The flap 3 is rotatably installed inside the valve body 1 via the rotating shaft 4 and is located between the track groove 1b and the discharge chamber 1c. The flipping of the flap 3 can make the track groove 1b and the discharge chamber 1c connect or block.

[0043] The cleaning push plate 5 is located in the discharge chamber 1c and can move left and right. When the cleaning push plate 5 is located in the discharge chamber 1c, it supports the horizontally positioned flap 3 to prevent it from flipping over, and the flap 3 is positioned to block the connection between the track groove 1b and the discharge chamber 1c. When the cleaning push plate 5 slides out of the discharge chamber 1c, the flap 3 is no longer supported by the cleaning push plate 5, and the flap 3 can flip to a position that connects the track groove 1b and the discharge chamber 1c. The rightward movement of the cleaning push plate 5 can discharge the mud located in the discharge chamber 1c.

[0044] A control shaft 6 is fixed to the outer end of the rotating shaft 4. A straight groove 61 and a spiral groove 62 are opened on the outer peripheral wall of the control shaft 6. The spiral groove 62 is located at the left end of the straight groove 61 and communicates with the straight groove 61. The straight groove 61 passes through the right end face of the control shaft 6. The cleaning push plate 5 is provided with a drive protrusion 51 that matches the straight groove 61 and the spiral groove 62. When the cleaning push plate 5 slides to the left out of the discharge chamber 1c, the drive protrusion 51 is located in the straight groove 61. The gate plate 2 has just entered the track groove 1b. The cleaning push plate 5 moves further to the left. With the cooperation of the drive protrusion 51 and the spiral groove 62, the flip plate 3 flips with the rotating shaft 4 and the control shaft 6, so that the track groove 1b and the discharge chamber 1c are connected.

[0045] The gate 2 is connected to the cleaning push plate 5 through a transmission structure. When the gate 2 moves downward, it drives the cleaning push plate 5 to move to the left through the transmission structure. When the gate 2 moves upward, it drives the cleaning push plate 5 to move to the right through the transmission structure.

[0046] The transmission structure includes

[0047] The control lever 7 is fixed to one side of the gate 2 and extends downward.

[0048] The vertically arranged first belt drive group 8a includes two first pulleys 8a1 that are spaced apart vertically and installed on the left side of the valve body 1. The two first pulleys 8a1 are connected by a first belt 8a2. The control rod 7 is fixed to the first belt 8a2 by a side-protruding first connecting part 71.

[0049] The mounting bracket 9 is fixed to the bottom of the valve body 1;

[0050] The inclined second belt drive assembly 8b includes two second pulleys 8b1 and a second belt 8b2 connecting the two second pulleys 8b1. One of the second pulleys 8b1 is coaxially spaced from the first pulley 8a1 located below and can rotate synchronously. The other second pulley 8b1 is mounted on a fixed frame and located to the left of the first pulley 8a1.

[0051] The third belt drive assembly 8c, which is arranged laterally, includes two third pulleys 8c1 that are spaced apart on the fixed frame 9 and a third belt 8c2 that connects the two third pulleys 8c1. One of the third pulleys 8c1 is coaxially spaced apart from the second pulley 8b1 located below and can rotate synchronously. The other third pulley 8c1 is located to the right of the first pulley 8a1.

[0052] The movable frame 11 is constrained to the fixed frame 9 by the lower slide rail 111 and the upper part is constrained to the cleaning push plate 5 by the upper slide rail 112, so that the movable frame 11 can move left and right relative to the bottom of the valve body 1 and the cleaning push plate 5.

[0053] The fourth belt drive assembly 8d, which is arranged laterally, includes two fourth pulleys 8d1 spaced apart on the movable frame 11 and a fourth belt 8d2 connecting the two fourth pulleys 8d1. The fixed frame 9 is fixed to the lower part of the fourth belt 8d2 through the second connecting part 91 with a side protrusion. The cleaning push plate 5 is fixed to the upper part of the fourth belt 8d2 through the third connecting part 52 with a side protrusion. The movable frame 11 is fixed to the upper part of the third belt 8c2 through the fourth connecting part 113 with a side protrusion.

[0054] The working principle and process of this front-end gate embodiment are as follows:

[0055] When the front gate is open, the slurry in front of the shield machine's sealing partition flows through the front gate to the back of the sealing partition and is then output by the screw conveyor. When the front gate is closed, the slurry cannot flow to the back of the sealing partition, thus ensuring the pressure at the excavation face. At the same time, it prevents the slurry from flowing to the back of the sealing partition during maintenance to avoid affecting the maintenance.

[0056] When this gate closes from the open state, such as Figure 1 ,2 As shown, the gate 2 is in the open state. At this time, the mud flows through the flow channel 1a and through the valve body 1. First, the electric push rod 10 is controlled to retract, driving the gate 2 to descend, which in turn drives the control rod 7 to move and descend. Since the control rod 7 is fixedly connected to the first belt 8a2, the two first pulleys 8a1 cooperate through the first belt 8a2, thereby driving the first pulleys 8a1 to rotate counterclockwise. Since the second pulley 8b1 located above is coaxially spaced with the first pulley 8a1 located below and can rotate synchronously, the second pulley 8b1 also rotates counterclockwise. The two second pulleys 8b1 are connected through the first belt 8a2. The second belt 8b2 engages, causing the other second pulley 8b1 to rotate counterclockwise. Since the third pulley 8c1 on the left is coaxially spaced with the second pulley 8b1 below and rotates synchronously, the third pulley 8c1 follows suit, rotating counterclockwise. Because the two third pulleys 8c1 are connected by the third belt 8c2, and the moving frame 11 is fixed to the third belt 8c2, and the moving frame 11 is constrained to the fixed frame 9 by the lower slide rail 111, the third belt 8c2 drives the moving frame 11 to move to the left along the direction of the fixed frame 9. Because the two fourth pulleys 8d1 are connected by the third belt 8c2, the third belt 8c2 drives the moving frame 11 to move to the left along the direction of the fixed frame 9. The four belts 8d2 are engaged, and the fixed frame 9 is fixed to the fourth belt 8d2. When the moving frame 11 moves to the left, it will drive the two fourth pulleys 8d1 to rotate counterclockwise, and the lower fourth belt 8d2 will move to the right, while the upper fourth belt 8d2 will move to the left. Since the cleaning push plate 5 is fixed to the upper part of the fourth belt 8d2, the upper part of the moving frame 11 is constrained to the lower part of the cleaning push plate 5 by the upper slide rail 112, thereby driving the cleaning push plate 5 to move to the left relative to the moving frame 11. The cleaning push plate 5 moves to the left along the discharge cavity 1c. The side contact and engagement of the flap 3 ensures that when the cleaning push plate 5 is placed in the discharge chamber 1c, the flap 3 cannot rotate, thus keeping the flap 3 stationary during the descent of the gate 2. This keeps the track groove 1b and the discharge chamber 1c continuously blocked, and the driving protrusion 51 follows the cleaning push plate 5 to the left. The driving protrusion 51 enters the straight groove 61 and moves to the left along the straight groove 61, keeping the control shaft 6 stationary. When the driving protrusion 51 passes through the straight groove 61 and just enters the spiral groove 62, the cleaning push plate 5 just disengages from the flap 3, and at this moment, the lower end of the gate 2 just enters the track groove 1b (e.g., Figure 4 , 5 As shown), the control gate 2 continues to descend, which in turn drives the cleaning push plate 5 to move to the left, causing the drive protrusion 51 to move to the left. Through the cooperation of the drive protrusion 51 and the spiral groove 62, the control shaft 6 rotates, which in turn drives the flap 3 to rotate, connecting the track groove 1b and the discharge chamber 1c. This pushes the mud accumulated in the track groove 1b into the discharge chamber 1c, allowing the gate 2 to descend into position and form a stable seal to cut off the flow channel 1a (as shown). Figure 6 , 7 (As shown in Figure 8), complete the shutdown.

[0057] When this gate is opened from the closed state, such as Figure 6 , 7 As shown in Figure 8, with the gate 2 in the closed state, the electric push rod 10 is first extended, causing the gate 2 to rise, which in turn causes the control rod 7 to move and rise. Since the control rod 7 is fixedly connected to the first belt 8a2, the two first pulleys 8a1 cooperate through the first belt 8a2, thereby causing the first pulleys 8a1 to rotate clockwise. Since the upper second pulley 8b1 is coaxially spaced and can rotate synchronously with the lower first pulley 8a1, the second pulley 8b1 also rotates clockwise. The two second pulleys 8b1 cooperate through the second belt 8b2, so the other second pulley 8b1 also rotates clockwise. Since the left third pulley 8c1 is coaxially spaced and can rotate synchronously with the lower second pulley 8b1, the third pulley 8c1 also rotates clockwise. Since the two third pulleys 8c1 cooperate through the third belt 8c2, and the moving frame 11 is fixed to the third belt 8c2, the moving frame 11 is constrained to the fixed frame 9 by the lower slide rail 111, so that... The third belt 8c2 drives the movable frame 11 to move to the right along the direction of the fixed frame 9. Since the two fourth pulleys 8d1 are engaged by the fourth belt 8d2, and the fixed frame 9 is fixed to the fourth belt 8d2, when the movable frame 11 moves to the right, it drives the two fourth pulleys 8d1 to rotate clockwise. Simultaneously, the lower fourth belt 8d2 moves to the left, and the upper fourth belt 8d2 moves to the right. Because the cleaning push plate 5 is fixed to the top of the fourth belt 8d2, the movable frame 11... 1. The upper part is constrained below the cleaning push plate 5 by the upper slide rail 112, thereby driving the cleaning push plate 5 to move to the right relative to the moving frame 11, that is, the cleaning push plate 5 moves to the right along the discharge cavity 1c. Since the driving protrusion 51 cooperates with the spiral groove 62 at this time, when the driving protrusion 51 moves to the right, it drives the control shaft 6 to rotate, which in turn drives the flip plate 3 to rotate. When the driving protrusion 51 just enters the straight groove 61 through the spiral groove 62, the flip plate 3 rotates exactly 90 degrees, blocking the discharge cavity 1c and the track groove 1b (e.g. Figure 4 , 5(As shown), then the gate 2 continues to rise, thereby driving the cleaning push plate 5 to continue moving to the right. At the same time, the drive protrusion 51 also moves to the right. Because the drive protrusion 51 and the straight groove 61 cooperate, the flap 3 remains stationary. When the cleaning push plate 5 moves to the right and is below the flap 3, because the upper side of the cleaning push plate 5 contacts and cooperates with the flap 3, the flap 3 cannot rotate when the cleaning push plate 5 is placed in the discharge chamber 1c. At this time, the drive protrusion 51 has disengaged from the straight groove 61, so that the flap 3 remains stationary during the rise and fall of the gate 2, keeping the track groove 1b and the discharge chamber 1c blocked. The gate 2 continues to rise, connecting the flow channel 1a. At the same time, the cleaning push plate 5 continues to move to the right, pushing the mud in the discharge chamber 1c to the right and pushing the right end outlet X of the one-way valve 12 to discharge. When the gate 2 rises and fully opens the flow channel 1a (as shown), Figure 1 , 2 As shown), the invention is now fully operational.

[0058] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "inner," "outer," "upper," and "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A shield tunneling machine front gate, comprising: A valve body (1) has a flow channel (1a) that runs through the front and back, and a track groove (1b) is provided at the bottom of the valve body (1); Gate (2) is inserted into valve body (1) and driven by drive mechanism to move up and down. The upward movement of gate (2) can disengage from track groove (1b) and open the flow channel (1a). The downward movement of gate (2) inserts into track groove (1b) and closes the flow channel (1a). Its features are: Also includes The discharge chamber (1c) is located at the bottom of the valve body (1) and below and connected to the track groove (1b); The flap (3) is rotatably installed in the valve body (1) via the rotating shaft (4) and located between the track groove (1b) and the discharge chamber (1c). The flipping of the flap (3) can make the track groove (1b) and the discharge chamber (1c) connect or block. A cleaning push plate (5) is located in the discharge chamber (1c) and can move left and right. When the cleaning push plate (5) is located in the discharge chamber (1c), the cleaning push plate (5) supports the horizontally positioned flap (3) to prevent it from flipping. The flap (3) is positioned to block the connection between the track groove (1b) and the discharge chamber (1c). When the cleaning push plate (5) slides out of the discharge chamber (1c), the flap (3) is no longer supported by the cleaning push plate (5), and the flap (3) can flip to a position that connects the track groove (1b) and the discharge chamber (1c). The rightward movement of the cleaning push plate (5) can discharge the mud located in the discharge chamber (1c). The outer end of the rotating shaft (4) is fixed with a control shaft (6). The outer peripheral wall of the control shaft (6) has a straight groove (61) and a spiral groove (62). The spiral groove (62) is located at the left end of the straight groove (61) and communicates with the straight groove (61). The straight groove (61) passes through the right end face of the control shaft (6). The cleaning push plate (5) is provided with a drive protrusion (51) that matches the straight groove (61) and the spiral groove (62). When the cleaning push plate (5) slides to the left out of the discharge chamber (1c), the drive protrusion (51) is located in the straight groove (61). The gate (2) has just entered the track groove (1b). The cleaning push plate (5) moves further to the left. As the drive protrusion (51) and the spiral groove (62) cooperate, the flap (3) flips with the rotating shaft (4) and the control shaft (6), so that the track groove (1b) and the discharge chamber (1c) are connected. The cleaning push plate (5) moves to the right along the discharge chamber (1c). Since the drive protrusion (51) and the spiral groove (62) cooperate at this time, the drive protrusion (51) drives the control shaft (6) to rotate when it moves to the right, which in turn drives the flap (3) to rotate. When the drive protrusion (51) just enters the straight groove (61) through the spiral groove (62), the flap (3) rotates exactly 90 degrees, blocking the discharge chamber (1c) and the track groove (1b).

2. The shield machine front gate according to claim 1, characterized in that: The discharge chamber (1c) is provided with a one-way valve (12) at the right end outlet that only allows slurry to be discharged from the right end outlet (X) of the discharge chamber (1c).

3. The shield machine front gate according to claim 1, characterized in that: The gate (2) can move up and down by being driven by an electric push rod (10) mounted on the valve body (1).

4. The shield machine front gate according to any one of claims 1 to 3, characterized in that: The gate (2) is connected to the cleaning push plate (5) through a transmission structure. When the gate (2) moves down, it drives the cleaning push plate (5) to move to the left through the transmission structure. When the gate (2) moves up, it drives the cleaning push plate (5) to move to the right through the transmission structure.

5. The shield machine front gate according to claim 4, characterized in that: The transmission structure includes The control lever (7) is fixed to one side of the gate (2) and extends downward; The vertically arranged first belt drive assembly (8a) includes two first pulleys (8a1) spaced apart vertically and installed on the left side of the valve body (1). The two first pulleys (8a1) are connected by a first belt (8a2). The control rod (7) is fixed to the first belt (8a2). A mounting bracket (9) is fixed to the bottom of the valve body (1); The inclined second belt drive assembly (8b) includes two second pulleys (8b1) and a second belt (8b2) connecting the two second pulleys (8b1). One of the second pulleys (8b1) is coaxially spaced from the first pulley (8a1) located below and can rotate synchronously. The other second pulley (8b1) is mounted on a fixed frame and located to the left of the first pulley (8a1). The third belt drive assembly (8c) arranged laterally includes two third pulleys (8c1) spaced apart on the fixed frame (9) and a third belt (8c2) connecting the two third pulleys (8c1). One of the third pulleys (8c1) is coaxially spaced apart from the second pulley (8b1) located below and can rotate synchronously. The other third pulley (8c1) is located to the right of the first pulley (8a1). The movable frame (11) is constrained to the fixed frame (9) by the lower part of the sliding rail (111) and constrained to the cleaning push plate (5) by the upper part of the sliding rail (112), so that the movable frame (11) can move left and right relative to the bottom of the valve body (1) and the cleaning push plate (5); The fourth belt drive assembly (8d) is arranged horizontally, including two fourth pulleys (8d1) spaced apart on the movable frame (11) and a fourth belt (8d2) connecting the two fourth pulleys (8d1). The fixed frame (9) is fixed below the fourth belt (8d2), the cleaning push plate (5) is fixed above the fourth belt (8d2), and the movable frame (11) is fixed above the third belt (8c2).

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