Slurry stopping sealing device of shield tunneling machine

Abstract

The invention relates to the field of shield tunneling machines, in particular to a grout stopping sealing device of a shield tunneling machine. Comprising a shield tunneling machine body, the shield tunneling machine body comprises a cutterhead and an anterior shield, the cutterhead and the anterior shield are coaxially and rotatably connected, and the shield tunneling machine further comprises an annular plate arranged on the side, close to the anterior shield, of the cutterhead and coaxially and fixedly connected with the anterior shield; the sealing ring is arranged on the side, close to the front shield, of the annular plate and slidably connected with the annular plate; the sealing mechanisms are arranged along the side, close to the annular plate, of the front shield in an equal-angle array mode, each sealing mechanism comprises a sealing block, and the sealing blocks push sealing rings to expand during grout stopping and sealing; the staggered jacking assembly is fixedly connected with the front shield and comprises a plurality of staggered jacking mechanisms, the staggered jacking mechanisms are arranged in the circumferential direction of the front shield in an equal-angle array mode, each staggered jacking mechanism comprises a main supporting plate, and the main supporting plates correspond to the sealing blocks one to one and move alternately with the sealing blocks. According to the invention, the sealing ring is tightly supported by arranging the plurality of sealing blocks, so that the sealing ring is prevented from being damaged due to non-uniform pressure after being tightly supported.

Description

Technical Field

[0001] The invention relates to the field of shield machines, and in particular to a slurry stopping sealing device of a shield machine. Background Art

[0002] In the operation of an open shield machine, the excavation face is open, and it is impossible to establish a dynamically changing pressure balance in front like an earth pressure balance or slurry balance shield machine. When over-excavation or loose rocks occur locally, a large gap will be formed between the shield shell and the tunnel surface. The mortar filled synchronously during the shield advancement can easily flow through this gap to the pressure-free excavation face, resulting in a large amount of mortar consumption and is not conducive to the control of surface settlement.

[0003] Existing grout-stopping sealing devices mostly use an annular rubber bladder and a sealing ring for sealing, but the sealing performance of the annular rubber bladder depends on the stable maintenance of the internal pressure. Once the internal pressure is unstable, the deformation degree of the rubber bladder will change, thereby affecting its fit with the inner wall of the tunnel, reducing the sealing effect and increasing the risk of grout leakage. At the same time, when encountering complex geological conditions, the rubber bladder is easily scratched or punctured, affecting the reliability of the seal.

[0004] However, due to its annular structure, if the seal ring is only opened by a push rod, the annular structure will make it impossible for the seal ring to be evenly opened and pressed against the inner wall of the tunnel. However, uneven opening will lead to extremely uneven pressure distribution between the seal ring and the inner wall of the tunnel. In areas with higher pressure, high pressure will accelerate the wear and aging of the seal ring, further weakening the sealing effect; while in areas with lower pressure, the seal ring that is not fully opened cannot play an effective sealing role at all.

[0005] Therefore, how to improve the sealing ability of the sealing ring and prevent it from being damaged due to uneven pressure is a technical problem to be solved by personnel in this technical field. Summary of the invention

[0006] Based on this, it is necessary to provide a slurry stopping sealing device for a shield machine in response to the existing technical problems.

[0007] In order to solve the problems of the prior art, the technical solution adopted by the present invention is: A slurry stopping sealing device for a shield machine comprises a shield machine body, wherein the shield machine body comprises a cutter head and a front shield, wherein the cutter head and the front shield are coaxially rotatably connected, and further comprises: The annular plate is arranged on a side of the cutter head close to the front shield and is coaxially fixed to the front shield; A sealing ring is arranged on a side of the annular plate close to the front shield and is slidably connected to the annular plate; A plurality of sealing mechanisms are arranged in an array at equal angles along one side of the front shield close to the annular plate, each sealing mechanism comprising a sealing block, which pushes the sealing ring to expand when performing slurry sealing; The staggered lifting assembly is fixedly connected to the front shield and includes a plurality of staggered lifting mechanisms, which are arranged in an array with equal angles along the circumference of the front shield. Each staggered lifting mechanism includes a main support plate, and the main support plates correspond to the sealing blocks one by one and move alternately with the sealing blocks.

[0008] Furthermore, the offset jacking assembly includes a card plate, a positioning support plate, two hydraulic motors, two hydraulic gears and two first gear rings. The card plate is fixedly connected to the front shield coaxially, the positioning support plate is fixedly connected to the inner wall of the front shield and to the end of the card plate away from the sealing block, the two hydraulic motors are fixedly arranged on the upper end of the positioning support plate, the two hydraulic gears are respectively fixedly connected to the output ends of the two hydraulic motors coaxially, the two first gear rings are arranged coaxially with the front shield and are respectively meshed with the two hydraulic gears, one first gear ring is slidably connected to the card plate, and the other first gear ring is slidably connected to the front shield through a gear seat.

[0009] Furthermore, the first gear ring is composed of a plurality of arc-shaped racks connected end to end, the inner side and the outer side of the arc-shaped racks are formed with teeth, and the hydraulic gear is meshed with the teeth on the inner side of the arc-shaped racks.

[0010] Furthermore, the offset lifting mechanism also includes a first gear, a positioning pin, a positioning plate and a first pulley. The first gear is rotatably connected to the clamping plate and meshes with the teeth on the outer side of the arc-shaped rack. The positioning plate is coaxially fixed to the first gear. A limiting arc groove is formed on the side of the positioning plate away from the first gear. The first pulley is coaxially arranged with the positioning plate. One end of the positioning pin is slidably connected to the limiting arc groove, and the other end is fixed to a side of the first pulley close to the positioning plate.

[0011] Furthermore, the offset lifting mechanism also includes a steel belt, a second pulley, an adapter plate and a main gear. The first pulley and the second pulley are connected through a steel belt transmission. One end of the adapter plate is coaxially fixed to the second pulley, and the other end is coaxially fixed to the main gear. The main gear is rotatably connected to the clamping plate.

[0012] Furthermore, the staggered lifting mechanism also includes a secondary screw, a secondary support plate and two limit shafts. The first gear is threadedly connected to the secondary screw through a screw sleeve. The two limit shafts are symmetrically arranged on both sides of the secondary screw. The secondary support plate is fixedly connected to the end of the secondary screw away from the sealing block, and the two ends of the secondary support plate are fixedly connected to one end of the two limit shafts. The main support plate is fixedly connected to the end of the secondary screw close to the sealing block, and the two ends of the main support plate are fixedly connected to the other end of the two limit shafts. The secondary screw and the limit shaft are respectively slidably connected to the clamping plate, and the first pulley and the secondary screw are rotationally connected for axial limitation.

[0013] Furthermore, a plurality of balls are rotatably arranged at equal intervals on one side of the main support plate close to the sealing ring.

[0014] Furthermore, the sealing mechanism includes a base, a main screw, a bottom seal and four connecting rods, one end of the base is fixedly connected to the annular plate, and the other end is fixedly connected to the clamping plate, the main screw is arranged on a side of the base away from the center of the clamping plate, one end of the main screw is rotatably connected to the annular plate, and the other end is fixedly connected to the main gear coaxially, the bottom seal is slidably connected to the base and is threadedly connected to the main screw through a screw sleeve, and two connecting rods are respectively arranged on the same side of the bottom seal and the base, one end of the connecting rod is hinged to the bottom seal, and the other end is hinged to the sealing block.

[0015] Furthermore, the sealing mechanism also includes a front frame, a sealing key, a base frame and an inclined block. The front frame is fixedly connected to the end of the base away from the card plate, the base frame is fixedly connected to the front frame, the inclined block is fixedly connected to the base, the sealing key is fixedly connected to the side of the sealing block close to the base, and the sealing key is respectively connected to the base frame and the inclined block through inclined sliding connections.

[0016] Furthermore, the sealing mechanism also includes a bottom plate, a top plate, a plurality of telescopic rods and a plurality of limit tension springs. The bottom plate is fixedly connected to the upper end of the bottom seal, the top plate is slidably connected to the lower end of the sealing block, one end of the plurality of telescopic rods is fixedly connected to the bottom plate, and the other end is fixedly connected to the top plate. The plurality of limit tension springs are respectively sleeved on the outside of the plurality of telescopic rods, one end of the limit tension spring is fixedly connected to the bottom plate, and the other end is fixedly connected to the top plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects: Firstly, the device is provided with a plurality of sealing blocks to tighten and expand the sealing ring, so as to ensure that after the sealing ring is tightened, the pressure on the inner side of the sealing ring is evenly distributed, so as to avoid the outer side of the sealing ring being damaged due to uneven thrust on the inner side after the pressure is applied to the outer side of the sealing ring; Second, the device assists in tightening the sealing ring by setting a number of main support plates, ensuring that the sealing ring is fastened to the main support plate each time it contracts, preventing the sealing ring from expanding and tightening due to excessive friction between the sealing block and the sealing ring, thereby affecting the expansion speed of the sealing ring; Thirdly, the device sets a positioning plate and a positioning pin to create a time difference between the rotation of the main gear and the first gear, thereby ensuring that the main support plate always moves before the sealing block, preventing the main support plate and the sealing block from colliding during movement, and improving the overall integrity of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the three-dimensional structure of the shield machine body and the sealing ring in the embodiment; Figure 2 2 is a schematic diagram of the three-dimensional structure decomposition of the shield machine body in the embodiment; Figure 3 is a schematic diagram of the three-dimensional structure of several sealing mechanisms in the embodiment; Figure 4 It is a schematic diagram of the partial structure of several dislocation lifting mechanisms in the embodiment; Figure 5 It is a schematic diagram of the partial structure of several dislocation lifting mechanisms in the embodiment; Figure 6 is a schematic diagram of the three-dimensional structure of the sealing mechanism in the recovered state in the embodiment; Figure 7 is a schematic diagram of the three-dimensional structure of the sealing mechanism in the embodiment in a jacking state; Figure 8 is a half-section view of the three-dimensional structure of the sealing mechanism in the embodiment; Fig. 9 is a schematic diagram of a three-dimensional structure decomposition of a sealing mechanism in an embodiment; Fig.10 yes Fig. 9 A magnified view of the structure in the middle.

[0019] The numbers in the figure are: 1. Shield machine body; 2. Cutterhead; 3. Front shield; 4. Ring plate; 5. Sealing ring; 6. Sealing mechanism; 7. Sealing block; 8. Sealing key; 9. Base; 10. Front frame; 11. Bottom frame; 12. Oblique block; 13. Main screw; 14. Bottom seal; 15. Bottom plate; 16. Telescopic rod; 17. Limiting tension spring; 18. Top plate; 19. Connecting rod; 20. Main gear; 21. Displacement jacking assembly; 22. Hydraulic motor; 23. Card plate; 24. Positioning support plate; 25. Hydraulic gear; 26. First gear ring; 27. Arc rack; 28. Offset lifting mechanism; 29. ​​First gear; 30. Positioning pin; 31. Positioning plate; 32. Limiting arc groove; 33. First pulley; 34. Steel belt; 35. Second pulley; 36. Adapter plate; 37. Secondary screw; 38. Limiting shaft; 39. Main support plate; 40. Ball bearing; 41. Secondary support plate. DETAILED DESCRIPTION

[0020] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] refer to Figures 1 to 10 A slurry stopping sealing device for a shield machine comprises a shield machine body 1, wherein the shield machine body 1 comprises a cutter head 2 and a front shield 3, wherein the cutter head 2 and the front shield 3 are coaxially rotatably connected, and further comprises: The annular plate 4 is arranged on a side of the cutter head 2 close to the front shield 3 and is coaxially fixedly connected to the front shield 3; A sealing ring 5 is arranged on a side of the annular plate 4 close to the front shield 3 and is slidably connected to the annular plate 4; A plurality of sealing mechanisms 6 are arranged in an array at equal angles along one side of the front shield 3 close to the annular plate 4. Each sealing mechanism 6 includes a sealing block 7 (see Figure 2 and Figure 3 ), the sealing block 7 pushes the sealing ring 5 to expand when stopping the slurry sealing; The staggered lifting assembly 21 is fixedly connected to the front shield 3, and includes a plurality of staggered lifting mechanisms 28, which are arranged in an array with equal angles along the circumferential direction of the front shield 3 (refer to Figure 3 ), each dislocation lifting mechanism 28 includes a main support plate 39, and a plurality of main support plates 39 correspond to a plurality of sealing blocks 7 one by one and move alternately with the sealing blocks 7 (refer to Figure 5 ).

[0022] When the device is in operation, as the shield machine body 1 moves, the cutter head 2 of the shield machine body 1 will cut the soil layer during the movement of the shield machine body 1. When the tunnel needs to be sealed, under the action of the offset jacking assembly 21, the offset jacking assembly 21 will drive a number of sealing blocks 7 to expand and tighten the sealing ring 5. When a number of sealing blocks 7 move, there will be a difference in the order of movement of two adjacent sealing blocks 7, ensuring that all the sealing blocks 7 can fully expand the sealing ring 5 after moving, avoiding the defect of uneven pressure after the sealing ring 5 is expanded. At the same time, in order to ensure that the sealing ring 5 does not shrink to the state where the sealing block 7 cannot be lifted when it is not expanded, a number of main support plates 39 will move alternately with the sealing blocks 7, that is, when the sealing block 7 approaches the sealing ring 5, the main support plate 39 moves away from the sealing ring 5; when the sealing block 7 moves away from the sealing ring 5, the main support plate 39 approaches the sealing ring 5.

[0023] In order to provide the dislocation lifting mechanism 28 with sufficient driving force, the following features are also specifically provided: The dislocation lifting assembly 21 includes a card plate 23, a positioning support plate 24, two hydraulic motors 22, two hydraulic gears 25 and two first gear rings 26. The card plate 23 is fixedly connected to the front shield 3 coaxially, the positioning support plate 24 is fixedly connected to the inner wall of the front shield 3 and to the end of the card plate 23 away from the sealing block 7. The two hydraulic motors 22 are fixedly arranged at the upper end of the positioning support plate 24. The two hydraulic gears 25 are respectively fixedly connected to the output ends of the two hydraulic motors 22 coaxially. The two first gear rings 26 are arranged coaxially with the front shield 3 and mesh with the two hydraulic gears 25 respectively. One first gear ring 26 is slidably connected to the card plate 23, and the other first gear ring 26 is slidably connected to the front shield 3 through the gear seat. When the slurry stop seal is required, the two hydraulic motors 22 are started and drive the two hydraulic gears 25 to rotate. After the two hydraulic gears 25 rotate, they will respectively drive the two first gear rings 26 to rotate. When the two first gear rings 26 rotate, they will eventually drive the sealing ring 5 to tighten. During this process, the hydraulic motor 22 can provide sufficient driving force to avoid the sealing ring 5 being unable to be tightened due to insufficient power.

[0024] In order to supplement the specific structure of the first gear ring 26, the following features are also specifically provided: The first gear ring 26 is composed of a plurality of arc-shaped racks 27 connected end to end, and teeth are formed on the inner and outer sides of the arc-shaped racks 27, and the hydraulic gear 25 meshes with the teeth on the inner side of the arc-shaped racks 27. When the first gear ring 26 is installed, a plurality of arc-shaped racks 27 are connected end to end to form the entire first gear ring 26, thereby avoiding the difficulty of processing and installation caused by the large volume of the shield machine body 1.

[0025] In order to supplement the specific structure of the dislocation lifting mechanism 28, the following features are also specifically provided: The offset lifting mechanism 28 also includes a first gear 29, a positioning pin 30, a positioning plate 31 and a first pulley 33. The first gear 29 is rotatably connected to the clamping plate 23 and meshes with the teeth on the outer side of the arc-shaped rack 27 (refer to Figure 5 ), the positioning plate 31 is coaxially fixedly connected to the first gear 29, and a limiting arc groove 32 is formed on the side of the positioning plate 31 away from the first gear 29 (refer to Fig.10 ), the first pulley 33 is coaxially arranged with the positioning disk 31, one end of the positioning pin 30 is slidably connected with the limiting arc groove 32, and the other end is fixedly connected with the side of the first pulley 33 close to the positioning disk 31. When the arc-shaped rack 27 rotates, the arc-shaped rack 27 drives the positioning disk 31 to rotate through the first gear 29, and the positioning disk 31 will only drive the first pulley 33 to rotate when the end of the limiting arc groove 32 is against the positioning pin 30 and the positioning disk 31 continues to rotate, that is, at this time, there is a time difference between the rotation of the positioning disk 31 and the first pulley 33, and the specific effect will be explained in detail later.

[0026] In order to further supplement the specific structure of the dislocation lifting mechanism 28, the following features are also specifically provided: The offset lifting mechanism 28 also includes a steel belt 34, a second pulley 35, an adapter plate 36 and a main gear 20. The first pulley 33 and the second pulley 35 are connected by the steel belt 34. One end of the adapter plate 36 is coaxially fixed to the second pulley 35 (refer to Fig. 9 ), the other end is coaxially fixedly connected to the main gear 20, and the main gear 20 is rotatably connected to the clamping plate 23. After the first pulley 33 rotates, the first pulley 33 drives the second pulley 35 to rotate through the steel belt 34, and the second pulley 35 drives the main gear 20 to rotate through the adapter plate 36.

[0027] In order to drive the main support plate 39 to move, the following features are also specifically provided: The offset lifting mechanism 28 also includes a secondary screw 37, a secondary support plate 41 and two limit shafts 38. The first gear 29 is threadedly connected to the secondary screw 37 through a screw sleeve (refer to Figure 5), two limiting shafts 38 are symmetrically arranged on both sides of the auxiliary screw 37, the auxiliary support plate 41 is fixedly connected to the end of the auxiliary screw 37 away from the sealing block 7, and the two ends of the auxiliary support plate 41 are fixedly connected to one end of the two limiting shafts 38, the main support plate 39 is fixedly connected to the end of the auxiliary screw 37 close to the sealing block 7, and the two ends of the main support plate 39 are fixedly connected to the other ends of the two limiting shafts 38, the auxiliary screw 37 and the limiting shaft 38 are respectively slidably connected to the clamping plate 23, and the first pulley 33 and the auxiliary screw 37 are connected to the rotation for axial limiting. When the first gear 29 rotates, the first gear 29 will drive the auxiliary screw 37 to move through the screw seat, and the movement of the auxiliary screw 37 will drive the main support plate 39 fixed thereto to move, and the auxiliary screw 37 will be limited by the two limiting shafts 38, and the two limiting shafts 38 will be reinforced by the auxiliary support plate 41.

[0028] In order to reduce the friction between the main support plate 39 and the inner side of the sealing ring 5, and facilitate the main support plate 39 and the sealing ring 5 to abut and separate, the following features are specifically provided: A plurality of balls 40 are provided at equal intervals on one side of the main support plate 39 close to the sealing ring 5 (see Figure 4 When the main support plate 39 and the sealing ring 5 are against each other, the plurality of balls 40 will reduce the friction between the main support plate 39 and the sealing ring 5, thereby preventing the sealing ring 5 from being pressed against the main support plate 39 when it contracts, thereby preventing the main support plate 39 from being separated from the sealing ring 5.

[0029] In order to supplement the specific structure of the sealing mechanism 6, the following features are also specifically provided: The sealing mechanism 6 includes a base 9, a main screw 13, a bottom seal 14 and four connecting rods 19. One end of the base 9 is fixedly connected to the annular plate 4, and the other end is fixedly connected to the clamping plate 23. The main screw 13 is arranged on the side of the base 9 away from the center of the clamping plate 23. One end of the main screw 13 is rotatably connected to the annular plate 4, and the other end is fixedly connected to the main gear 20 coaxially. The bottom seal 14 is slidably connected to the base 9 and is threadedly connected to the main screw 13 through a screw sleeve (refer to Figure 6 and Figure 7 ), two connecting rods 19 are respectively arranged on the same side of the bottom seal 14 and the base 9, one end of the connecting rod 19 is hinged to the bottom seal 14, and the other end is hinged to the sealing block 7. When the main gear 20 rotates, the main gear 20 drives the bottom seal 14 to move through the main screw 13, and the bottom seal 14 is limited by the base 9 when moving.

[0030] In order to realize that when the sealing block 7 moves toward the direction close to the annular plate 4, the sealing block 7 will expand the sealing ring 5, the following features are specifically provided: The sealing mechanism 6 also includes a front frame 10, a sealing key 8, a bottom frame 11 and an inclined block 12. The front frame 10 is fixedly connected to the end of the base 9 away from the clamping plate 23, the bottom frame 11 is fixedly connected to the front frame 10, the inclined block 12 is fixedly connected to the bottom frame 11, the sealing key 8 is fixedly connected to the side of the sealing block 7 close to the base 9, and the sealing key 8 is respectively connected to the bottom frame 11 and the inclined block 12 through an inclined sliding surface. When the bottom seal 14 moves, the bottom seal 14 will drive the sealing block 7 to move through four connecting rods 19, and the sealing block 7 will drive the sealing key 8 to move during the movement. When the sealing key 8 moves, it will be connected to the bottom frame 11 and the inclined block 12 through an inclined sliding surface, thereby ensuring that when the sealing block 7 moves in the direction close to the annular plate 4, the sealing block 7 will also move in the direction away from the base 9, thereby achieving the expansion of the sealing ring 5. Please refer to the comparison diagram before and after the displacement. Figure 6 and Figure 7 .

[0031] In order to facilitate the key seal 8 to always keep against the base frame 11 and the inclined block 12 during the movement, the following features are also specifically provided: The sealing mechanism 6 further includes a bottom plate 15, a top plate 18, a plurality of telescopic rods 16 and a plurality of limit tension springs 17. The bottom plate 15 is fixedly connected to the upper end of the bottom seal 14, the top plate 18 is slidably connected to the lower end of the sealing block 7, one end of the plurality of telescopic rods 16 is fixedly connected to the bottom plate 15, and the other end is fixedly connected to the top plate 18, and a plurality of limit tension springs 17 are respectively sleeved on the outside of the plurality of telescopic rods 16, one end of the limit tension spring 17 is fixedly connected to the bottom plate 15, and the other end is fixedly connected to the top plate 18. When the sealing block 7 moves, the sealing block 7 will be limited by the plurality of telescopic rods 16 and the bottom plate 15, and at this time, the plurality of limit tension springs 17 will pull the sealing block 7 to have a tendency to move downward, so that the sealing key 8 always keeps against the bottom frame 11 and the inclined block 12 during the movement.

[0032] The working principle of the device is that when the device is in operation, as the shield machine body 1 moves and works, the cutter head 2 of the shield machine body 1 will cut the soil layer during the movement of the shield machine body 1, and the tunnel needs to be sealed by grouting.

[0033] The two hydraulic motors 22 are started in sequence. When the hydraulic motors 22 are started, the hydraulic motors 22 drive the corresponding arc-shaped racks 27 to move through the hydraulic gears 25. After the arc-shaped racks 27 move, they first drive the main support plate 39 to move. When the main support plate 39 moves, a number of balls 40 will reduce the friction between the main support plate 39 and the sealing ring 5 to prevent the sealing ring 5 from being pressed on the main support plate 39 when it shrinks, causing the main support plate 39 to be unable to separate from the sealing ring 5. The main support plate 39 will move alternately with the sealing block 7, that is, when the sealing block 7 approaches the sealing ring 5, the main support plate 39 moves away from the sealing ring 5; when the sealing block 7 moves away from the sealing ring 5, the main support plate 39 approaches the sealing ring 5. This prevents the sealing ring 5 from being completely tightened and the sealing blocks 7 from being unable to drive the sealing ring 5 to expand.

[0034] When the first gear 29 rotates and eventually drives the main gear 20 to rotate, there is a time difference between the rotation of the main gear 20 and the first gear 29, thereby ensuring that the main support plate 39 moves before the sealing block 7, thereby preventing the main support plate 39 and the sealing block 7 from colliding during the movement.

[0035] When the main gear 20 rotates, as the main gear 20 finally drives the bottom seal 14 to move, the bottom seal 14 will drive the seal block 7 to move through the four connecting rods 19. During the movement of the seal block 7, the seal key 8 will be driven to move. When the seal key 8 moves, it will be connected to the bottom frame 11 and the inclined block 12 through the inclined sliding surface, thereby ensuring that when the seal block 7 moves in the direction close to the annular plate 4, the seal block 7 will also move in the direction away from the base 9, thereby achieving the expansion of the sealing ring 5. The comparison diagram before and after the displacement is shown in FIG. Figure 6 and Figure 7 .

[0036] When the two hydraulic motors 22 are started, due to the time difference between the two hydraulic motors 22, the sealing ring 5 will be completely tightened by the sealing blocks 7 to avoid uneven force on the sealing ring 5 after being tightened, thereby affecting the effect of stopping the slurry.

[0037] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A grout-stopping sealing device for a shield machine, comprising a shield machine body (1), wherein the shield machine body (1) comprises a cutter head (2) and a front shield (3), wherein the cutter head (2) and the front shield (3) are coaxially rotatably connected, and wherein: include: An annular plate (4) is arranged on a side of the cutter disc (2) close to the front shield (3) and is coaxially fixedly connected to the front shield (3); A sealing ring (5) is arranged on a side of the annular plate (4) close to the front shield (3) and is slidably connected to the annular plate (4); A plurality of sealing mechanisms (6) are arranged in an array at equal angles along one side of the front shield (3) close to the annular plate (4), each sealing mechanism (6) comprising a sealing block (7), the sealing block (7) pushing the sealing ring (5) to expand when performing slurry sealing; The dislocation lifting assembly (21) is fixedly connected to the front shield (3), and comprises a plurality of dislocation lifting mechanisms (28). The plurality of dislocation lifting mechanisms (28) are arranged in an array at equal angles along the circumferential direction of the front shield (3). Each dislocation lifting mechanism (28) comprises a main support plate (39). The plurality of main support plates (39) correspond to the plurality of sealing blocks (7) one by one and move alternately with the sealing blocks (7).

2. A grout-stopping sealing device for a shield machine according to claim 1, characterized in that: The dislocation lifting assembly (21) comprises a clamping plate (23), a positioning support plate (24), two hydraulic motors (22), two hydraulic gears (25) and two first gear rings (26); the clamping plate (23) is fixedly connected to the front shield (3) coaxially; the positioning support plate (24) is fixedly connected to the inner wall of the front shield (3) and to one end of the clamping plate (23) away from the sealing block (7); the two hydraulic motors (22) are fixedly arranged on the upper end of the positioning support plate (24); the two hydraulic gears (25) are respectively fixedly connected to the output ends of the two hydraulic motors (22) coaxially; the two first gear rings (26) are arranged coaxially with the front shield (3) and are respectively meshed with the two hydraulic gears (25); one first gear ring (26) is slidably connected to the clamping plate (23); and the other first gear ring (26) is slidably connected to the front shield (3) via a gear seat.

3. A grout-stopping sealing device for a shield machine according to claim 2, characterized in that: The first gear ring (26) is composed of a plurality of arc-shaped racks (27) connected end to end, and teeth are formed on the inner and outer sides of the arc-shaped racks (27), and the hydraulic gear (25) meshes with the teeth on the inner side of the arc-shaped racks (27).

4. A grout-stopping sealing device for a shield machine according to claim 2, characterized in that: The dislocation lifting mechanism (28) further comprises a first gear (29), a positioning pin (30), a positioning plate (31) and a first pulley (33); the first gear (29) is rotatably connected to the clamping plate (23) and meshes with teeth on the outer side of the arc-shaped rack (27); the positioning plate (31) is coaxially fixedly connected to the first gear (29); a limiting arc groove (32) is formed on a side of the positioning plate (31) away from the first gear (29); the first pulley (33) is coaxially arranged with the positioning plate (31); one end of the positioning pin (30) is slidably connected to the limiting arc groove (32), and the other end is fixedly connected to a side of the first pulley (33) close to the positioning plate (31).

5. A grout-stopping sealing device for a shield machine according to claim 4, characterized in that: The dislocation lifting mechanism (28) further comprises a steel belt (34), a second pulley (35), an adapter plate (36) and a main gear (20); the first pulley (33) and the second pulley (35) are connected in transmission via the steel belt (34); one end of the adapter plate (36) is coaxially fixedly connected to the second pulley (35); and the other end of the adapter plate (36) is coaxially fixedly connected to the main gear (20); and the main gear (20) is rotationally connected to the clamping plate (23).

6. A grout-stopping sealing device for a shield machine according to claim 4, characterized in that: The dislocation lifting mechanism (28) further comprises a secondary screw (37), a secondary support plate (41) and two limit shafts (38); the first gear (29) is threadedly connected to the secondary screw (37) via a screw sleeve; the two limit shafts (38) are symmetrically arranged on both sides of the secondary screw (37); the secondary support plate (41) is fixedly connected to one end of the secondary screw (37) away from the sealing block (7); both ends of the secondary support plate (41) are fixedly connected to one end of the two limit shafts (38); the main support plate (39) is fixedly connected to one end of the secondary screw (37) close to the sealing block (7); both ends of the main support plate (39) are fixedly connected to the other ends of the two limit shafts (38); the secondary screw (37) and the limit shaft (38) are respectively slidably connected to the clamping plate (23); and the first pulley (33) and the secondary screw (37) are rotationally connected for axial limiting.

7. A grout-stopping sealing device for a shield machine according to claim 6, characterized in that: A plurality of balls (40) are rotatably arranged at equal intervals on one side of the main support plate (39) close to the sealing ring (5).

8. The grout stopping sealing device for a shield machine according to claim 5, characterized in that: The sealing mechanism (6) comprises a base (9), a main screw (13), a bottom seal (14) and four connecting rods (19). One end of the base (9) is fixedly connected to the annular plate (4), and the other end is fixedly connected to the clamping plate (23). The main screw (13) is arranged on a side of the base (9) away from the center of the clamping plate (23). One end of the main screw (13) is rotatably connected to the annular plate (4), and the other end is coaxially fixedly connected to the main gear (20). The bottom seal (14) is slidably connected to the base (9) and is threadedly connected to the main screw (13) via a screw sleeve. Two connecting rods (19) are respectively arranged on the same side of the bottom seal (14) and the base (9). One end of the connecting rod (19) is hinged to the bottom seal (14), and the other end is hinged to the sealing block (7).

9. A grout-stopping sealing device for a shield machine according to claim 8, characterized in that: The sealing mechanism (6) further comprises a front frame (10), a sealing key (8), a bottom frame (11) and an inclined block (12); the front frame (10) is fixedly connected to an end of the bottom frame (9) away from the clamping plate (23); the bottom frame (11) is fixedly connected to the front frame (10); the inclined block (12) is fixedly connected to the bottom frame (11); the sealing key (8) is fixedly connected to a side of the sealing block (7) close to the bottom frame (9); and the sealing key (8) is respectively connected to the bottom frame (11) and the inclined block (12) by sliding via an inclined surface.

10. A grout-stopping sealing device for a shield machine according to claim 9, characterized in that: The sealing mechanism (6) further comprises a bottom plate (15), a top plate (18), a plurality of telescopic rods (16) and a plurality of limit tension springs (17); the bottom plate (15) is fixedly connected to the upper end of the bottom seal (14); the top plate (18) is slidably connected to the lower end of the sealing block (7); one end of the plurality of telescopic rods (16) is fixedly connected to the bottom plate (15) and the other end is fixedly connected to the top plate (18); the plurality of limit tension springs (17) are respectively sleeved on the outside of the plurality of telescopic rods (16); one end of the limit tension spring (17) is fixedly connected to the bottom plate (15) and the other end is fixedly connected to the top plate (18).

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