A slurry stop and sealing device for a shield machine

Abstract

The present invention relates to the field of shield machines, and specifically relates to a grout stopping and sealing device for a shield machine. It includes a shield machine body, which includes a cutter head and a front shield. The cutter head is rotatably connected to the front shield coaxially. It further includes: an annular plate, which is arranged on the side of the cutter head close to the front shield and is fixedly connected to the front shield coaxially; a sealing ring, which is arranged on the side of the annular plate close to the front shield and is slidably connected to the annular plate; a plurality of sealing mechanisms, which are arranged in an equiangular array along the side of the front shield close to the annular plate. Each sealing mechanism includes a sealing block, and the sealing block pushes the sealing ring to expand during grout stopping and sealing; a misaligned jacking assembly, which is fixedly connected to the front shield and includes a plurality of misaligned jacking mechanisms. The plurality of misaligned jacking mechanisms are arranged in an equiangular array along the circumferential direction of the front shield. Each misaligned jacking mechanism includes a main support plate, and the plurality of main support plates correspond to the plurality of sealing blocks one by one and move alternately with the sealing blocks. By arranging a plurality of sealing blocks to tighten the sealing ring, the present invention avoids damage to the sealing ring due to uneven pressure after it is tightened.

Description

Technical Field

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

[0002] During the operation of an open - type shield machine, the excavation face is open, and it is impossible to establish a dynamically changing pressure balance in the front like an earth pressure balance or slurry balance shield machine. When local over - excavation or loosening of boulders occurs, a large gap will form between the shield shell and the tunnel surface. The mortar filled synchronously during shield propulsion can easily seep through this gap to the unpressurized excavation face, resulting in a large consumption of mortar and being unfavorable for the control of ground settlement.

[0003] Existing slurry stopping and sealing devices mostly use annular rubber capsules and sealing rings for sealing. However, the sealing performance of the annular rubber capsule depends on the stable maintenance of the internal pressure. Once the internal pressure is unstable, the deformation degree of the rubber capsule will change, thus affecting its tight fit with the tunnel inner wall, reducing the sealing effect, and increasing the risk of slurry leakage. At the same time, when encountering complex geological conditions, the rubber capsule is easily scratched or punctured, affecting the reliability of the seal.

[0004] For the sealing ring, due to its annular structure, if it is only expanded by a push rod, the annular structure causes the sealing ring to be unable to be evenly expanded and tightly pressed against the inner wall of the tunnel. However, uneven expansion will result in an extremely uneven pressure distribution between the sealing ring and the tunnel inner wall. At the parts with larger pressure, the high pressure will accelerate the wear and aging of the sealing ring, further weakening the sealing effect; while at the parts with smaller pressure, the sealing ring that is not fully expanded simply cannot play an effective sealing role.

[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 those skilled in the art. Summary of the Invention

[0006] Based on this, in view of the problems in the prior art, it is necessary to provide a slurry stopping and sealing device for a shield machine.

[0007] To solve the problems in the prior art, the technical solution adopted by the present invention is as follows:

[0008] A slurry stopping and sealing device for a shield machine, including a shield machine body. The shield machine body includes a cutter head and a front shield, and the cutter head is rotatably connected to the front shield coaxially. It further includes:

[0009] An annular plate, arranged on the side of the cutter head close to the front shield and fixedly connected to the front shield coaxially;

[0010] A sealing ring, arranged on the side of the annular plate close to the front shield and slidably connected to the annular plate;

[0011] A number of sealing mechanisms are arranged in an equiangular array along one side of the front shield close to the annular plate. Each sealing mechanism includes a sealing block, and the sealing block pushes the sealing ring to expand during grout stoppage and sealing.

[0012] A dislocation jacking assembly is fixedly connected to the front shield and includes a number of dislocation jacking mechanisms. The number of dislocation jacking mechanisms is arranged in an equiangular array along the circumferential direction of the front shield. Each dislocation jacking mechanism includes a main supporting plate, and a number of main supporting plates correspond one by one to a number of sealing blocks and move alternately with the sealing blocks.

[0013] Furthermore, the dislocation jacking assembly includes a clamping plate, a positioning supporting plate, two hydraulic motors, two hydraulic gears and two first toothed rings. The clamping plate is coaxially fixedly connected to the front shield. The positioning supporting plate is fixedly connected to the inner wall of the front shield and is fixedly connected to one end of the clamping plate away from the sealing block. The two hydraulic motors are fixedly arranged at the upper end of the positioning supporting plate. The two hydraulic gears are coaxially fixedly connected to the output ends of the two hydraulic motors respectively. The two first toothed rings are arranged coaxially with the front shield and are meshed with the two hydraulic gears respectively. One first toothed ring is slidably connected to the clamping plate, and the other first toothed ring is slidably connected to the front shield through a tooth seat.

[0014] Furthermore, the first toothed ring is composed of a number of arc-shaped racks butt-jointed end to end. Tooth teeth are formed on both the inner side and the outer side of the arc-shaped rack, and the hydraulic gear is meshed with the tooth teeth on the inner side of the arc-shaped rack.

[0015] Furthermore, the dislocation jacking mechanism further includes a first gear, a positioning pin, a positioning disc and a first belt pulley. The first gear is rotatably connected to the clamping plate and is meshed with the tooth teeth on the outer side of the arc-shaped rack. The positioning disc is coaxially fixedly connected to the first gear. A limiting arc groove is formed on one side of the positioning disc away from the first gear. The first belt pulley is arranged coaxially with the positioning disc. One end of the positioning pin is slidably connected to the limiting arc groove, and the other end is fixedly connected to one side of the first belt pulley close to the positioning disc.

[0016] Furthermore, the dislocation jacking mechanism further includes a steel belt, a second belt pulley, a transfer disc and a main gear. The first belt pulley and the second belt pulley are connected by a steel belt for transmission. One end of the transfer disc is coaxially fixedly connected to the second belt pulley, and the other end is coaxially fixedly connected to the main gear. The main gear is rotatably connected to the clamping plate.

[0017] Furthermore, the dislocation jacking mechanism further includes an auxiliary screw rod, an auxiliary supporting plate and two limiting shafts. The first gear is threadedly connected to the auxiliary screw rod through a screw sleeve. The two limiting shafts are symmetrically arranged on both sides of the auxiliary screw rod. The auxiliary supporting plate is fixedly connected to one end of the auxiliary screw rod away from the sealing block. Both ends of the auxiliary supporting plate are fixedly connected to one ends of the two limiting shafts. The main supporting plate is fixedly connected to one end of the auxiliary screw rod close to the sealing block. Both ends of the main supporting plate are fixedly connected to the other ends of the two limiting shafts. The auxiliary screw rod and the limiting shafts are respectively slidably connected to the clamping plate, and the first belt pulley and the auxiliary screw rod are rotationally connected with axial limit.

[0018] Furthermore, a number of balls are rotatably arranged at equal intervals on one side of the main supporting plate close to the sealing ring.

[0019] Further, 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 the 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 coaxially fixedly connected to the main gear. The bottom seal is slidably connected to the base and is threadedly connected to the main screw through a screw sleeve. 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.

[0020] Further, the sealing mechanism further includes a front frame, a sealing key, a bottom frame, and an inclined block. The front frame is fixedly connected to the end of the base away from the clamping plate. The bottom frame is fixedly connected to the front frame. The inclined block is fixedly connected to the bottom frame. The sealing key is fixedly connected to the side of the sealing block close to the base. The sealing key is slidably connected to the bottom frame and the inclined block respectively through inclined surfaces.

[0021] Further, the sealing mechanism further includes a bottom plate, a top plate, a plurality of telescopic rods, and a plurality of limiting 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 each 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 limiting tension springs are respectively sleeved outside the plurality of telescopic rods. One end of the limiting tension spring is fixedly connected to the bottom plate, and the other end is fixedly connected to the top plate.

[0022] The beneficial effects of the present invention compared with the prior art are as follows:

[0023] Firstly: By arranging a plurality of sealing blocks to tighten and expand the sealing ring, it is ensured that after the sealing ring is tightened, the pressure received inside the sealing ring is evenly distributed, avoiding damage to the sealing ring due to uneven internal thrust when the outside of the sealing ring is pressured.

[0024] Secondly: By arranging a plurality of main supporting plates to assist in tightening the sealing ring, it is ensured that each time the sealing ring contracts, it will be buckled on the main supporting plate, preventing excessive friction between the sealing block and the sealing ring during the expansion and tightening of the sealing ring, which affects the expansion speed of the sealing ring.

[0025] Thirdly: By arranging a positioning disk and a positioning pin, a time difference exists between the rotations of the main gear and the first gear, so as to ensure that the main supporting plate always moves ahead of the sealing block, preventing collision between the main supporting plate and the sealing block during the movement process and improving the overall integrity of the device. Description of the Drawings

[0026] Figure 1 is a three-dimensional structural schematic diagram of the shield machine body and the sealing ring in the embodiment;

[0027] Figure 2 is a three-dimensional structural exploded schematic diagram of the shield machine body in the embodiment;

[0028] Figure 3It is a schematic three-dimensional structure diagram of several sealing mechanisms in the embodiment;

[0029] Figure 4 It is a schematic partial structure diagram of several offset lifting mechanisms in the embodiment;

[0030] Figure 5 It is a schematic partial structure diagram of several offset lifting mechanisms in the embodiment;

[0031] Figure 6 It is a schematic three-dimensional structure diagram of the sealing mechanism in the recovery state in the embodiment;

[0032] Figure 7 It is a schematic three-dimensional structure diagram of the sealing mechanism in the lifting state in the embodiment;

[0033] Figure 8 It is a half-sectional view of the three-dimensional structure of the sealing mechanism in the embodiment;

[0034] Figure 9 It is a schematic exploded view of the three-dimensional structure of the sealing mechanism in the embodiment;

[0035] Figure 10 It is Figure 9 The enlarged view of the structure at position A in

[0036] The reference numerals in the figure are:

[0037] 1. Shield machine body; 2. Cutter head; 3. Front shield; 4. Annular plate; 5. Sealing ring; 6. Sealing mechanism; 7. Sealing block; 8. Sealing key; 9. Base; 10. Front frame; 11. Bottom frame; 12. Inclined block; 13. Main screw; 14. Bottom seal; 15. Bottom plate; 16. Telescopic rod; 17. Limit tension spring; 18. Top plate; 19. Connecting rod; 20. Main gear; 21. Offset lifting assembly; 22. Hydraulic motor; 23. Clamping plate; 24. Positioning support plate; 25. Hydraulic gear; 26. First gear ring; 27. Arc-shaped rack; 28. Offset lifting mechanism; 29. First gear; 30. Positioning pin; 31. Positioning disc; 32. Limit arc groove; 33. First belt pulley; 34. Steel belt; 35. Second belt pulley; 36. Adapter plate; 37. Auxiliary screw; 38. Limit shaft; 39. Main support plate; 40. Ball; 41. Auxiliary support plate. Detailed implementation manners

[0038] To further understand the features, technical means, specific purposes, and functions achieved by the present invention, the present invention will be described in further detail below in conjunction with the drawings and specific implementation manners.

[0039] Refer to Figures 1 to 10 , a slurry stop and seal device for a shield machine, including a shield machine body 1, the shield machine body 1 includes a cutter head 2 and a front shield 3, the cutter head 2 is rotatably connected to the front shield 3 coaxially, and further includes:

[0040] The annular plate 4 is arranged on one side of the cutter head 2 close to the front shield 3 and is fixedly connected to the front shield 3 coaxially;

[0041] The sealing ring 5 is arranged on one side of the annular plate 4 close to the front shield 3 and is slidably connected to the annular plate 4;

[0042] A plurality of sealing mechanisms 6 are arranged in an equiangular array along one side of the front shield 3 close to the annular plate 4. Each sealing mechanism 6 includes a sealing block 7 (refer to Figure 2 and Figure 3 ). When stopping slurry and sealing, the sealing block 7 pushes the sealing ring 5 to expand;

[0043] The dislocation jacking assembly 21 is fixedly connected to the front shield 3 and includes a plurality of dislocation jacking mechanisms 28. The plurality of dislocation jacking mechanisms 28 are arranged in an equiangular array along the circumferential direction of the front shield 3 (refer to Figure 3 ). Each dislocation jacking mechanism 28 includes a main supporting plate 39. The plurality of main supporting plates 39 correspond to the plurality of sealing blocks 7 one by one and move alternately with the sealing blocks 7 (refer to Figure 5 ).

[0044] When the device is operating, 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. When it is necessary to stop slurry and seal the tunnel, under the action of the dislocation jacking assembly 21, the dislocation jacking assembly 21 will drive a plurality of sealing blocks 7 to expand and tighten the sealing ring 5. When the plurality of sealing blocks 7 move, there will be a difference in the sequence of movement between two adjacent sealing blocks 7, ensuring that the sealing ring 5 can be fully expanded after all the sealing blocks 7 move, 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 will not shrink to a state where the sealing blocks 7 cannot lift it when not expanded, the plurality of main supporting plates 39 will move alternately with the sealing blocks 7, that is, when the sealing blocks 7 approach the sealing ring 5, the main supporting plates 39 move away from the sealing ring 5; when the sealing blocks 7 move away from the sealing ring 5, the main supporting plates 39 approach the sealing ring 5.

[0045] In order to give the dislocation jacking mechanism 28 sufficient driving force, the following features are specifically set:

[0046] The dislocation jacking assembly 21 includes a clamping plate 23, a positioning support plate 24, two hydraulic motors 22, two hydraulic gears 25 and two first toothed 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 is fixedly connected to one end of the clamping 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 coaxially fixedly connected to the output ends of the two hydraulic motors 22. The two first toothed rings 26 are arranged coaxially with the front shield 3 and are respectively meshed with the two hydraulic gears 25. One first toothed ring 26 is slidably connected to the clamping plate 23, and the other first toothed ring 26 is slidably connected to the front shield 3 through a toothed seat. When slurry stoppage and sealing are required, the two hydraulic motors 22 are started to drive the two hydraulic gears 25 to rotate. After the two hydraulic gears 25 rotate, they will respectively drive the two first toothed rings 26 to rotate. When the two first toothed rings 26 rotate, they will finally drive the sealing ring 5 to be tightened. During this process, the hydraulic motors 22 can provide sufficient driving force to prevent the sealing ring 5 from not being tightened due to insufficient power.

[0047] To supplement the specific structure of the first toothed ring 26, the following features are specifically provided:

[0048] The first toothed ring 26 is composed of a number of arc-shaped racks 27 butt-jointed end to end. Tooth teeth are formed on both the inner and outer sides of the arc-shaped rack 27. The hydraulic gear 25 is meshed with the tooth teeth on the inner side of the arc-shaped rack 27. When the first toothed ring 26 is installed, a number of arc-shaped racks 27 are butt-jointed end to end to form the whole first toothed ring 26, avoiding the difficulty of processing and installation due to the large volume of the shield machine body 1.

[0049] To supplement the specific structure of the dislocation jacking mechanism 28, the following features are specifically provided:

[0050] The dislocation jacking mechanism 28 further includes a first gear 29, a positioning pin 30, a positioning disk 31 and a first belt pulley 33. The first gear 29 is rotatably connected to the clamping plate 23 and is meshed with the tooth teeth on the outer side of the arc-shaped rack 27 (refer to Figure 5 ), the positioning disk 31 is coaxially fixedly connected to the first gear 29. A limiting arc groove 32 is formed on one side of the positioning disk 31 away from the first gear 29 (refer to Figure 10 ), the first belt pulley 33 is arranged coaxially with the positioning disk 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 one side of the first belt pulley 33 close to the positioning disk 31. When the arc-shaped rack 27 rotates, the arc-shaped rack 27 will drive the positioning disk 31 to rotate through the first gear 29. Only when the positioning disk 31 rotates to the end of the limiting arc groove 32 abuts against the positioning pin 30, the positioning disk 31 will continue to rotate to drive the first belt pulley 33 to rotate when it continues to rotate. That is, there is a time difference in the rotation of the positioning disk 31 and the first belt pulley 33 at this time, and the specific function will be explained in detail later.

[0051] In order to further supplement the specific structure of the dislocation lifting mechanism 28, the following features are also specifically provided:

[0052] 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 Figure 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.

[0053] In order to drive the main support plate 39 to move, the following features are also specifically provided:

[0054] 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.

[0055] 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:

[0056] 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.

[0057] In order to supplement the specific structure of the sealing mechanism 6, the following features are also specifically provided:

[0058] 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 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 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 will drive the bottom seal 14 to move through the main screw 13, and the bottom seal 14 will be limited by the base 9 during movement.

[0059] In order to achieve that when the sealing block 7 moves towards the annular plate 4, the sealing block 7 will expand the sealing ring 5, the following features are specifically set:

[0060] The sealing mechanism 6 further 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. The sealing key 8 is slidably connected to the bottom frame 11 and the inclined block 12 through inclined surfaces. When the bottom seal 14 moves, the bottom seal 14 will drive the sealing block 7 to move through the four connecting rods 19. During the movement of the sealing block 7, the sealing key 8 will be driven to move. When the sealing key 8 moves, it will be slidably connected to the bottom frame 11 and the inclined block 12 through inclined surfaces, so as to ensure that when the sealing block 7 moves towards the annular plate 4, the sealing block 7 will also displace away from the base 9, thereby realizing the expansion of the sealing ring 5. For the comparison diagrams before and after displacement, refer to Figure 6 and Figure 7 .

[0061] In order to facilitate the sealing key 8 to always abut against the bottom frame 11 and the inclined block 12 during movement, the following features are specifically set:

[0062] The sealing mechanism 6 further includes a bottom plate 15, a top plate 18, a plurality of telescopic rods 16, and a plurality of limiting 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 each 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. A plurality of limiting tension springs 17 are respectively sleeved outside the plurality of telescopic rods 16. One end of each limiting 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. At this time, the plurality of limiting tension springs 17 will pull the sealing block 7 with a downward movement tendency, so as to facilitate the sealing key 8 to always abut against the bottom frame 11 and the inclined block 12 during movement.

[0063] The working principle of this device is that when the device is in operation, as the main body 1 of the shield machine moves and works, the cutter head 2 of the main body 1 of the shield machine will cut the soil layer during the movement of the main body 1 of the shield machine, and when it is necessary to stop slurry and seal the tunnel.

[0064] Two hydraulic motors 22 are started in sequence. When the hydraulic motor 22 is started, the hydraulic motor 22 will drive the corresponding arc-shaped rack 27 to move through the hydraulic gear 25. After the arc-shaped rack 27 moves, it will 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, preventing the sealing ring 5 from being clamped on the main support plate 39 when it shrinks, resulting in the inability of the main support plate 39 to separate from the sealing ring 5. The main support plate 39 and the sealing block 7 move alternately, 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. Thus, it is avoided that after the sealing ring 5 is completely clamped, a number of sealing blocks 7 cannot drive the sealing ring 5 to expand.

[0065] During the process when the first gear 29 rotates and finally drives the main gear 20 to rotate, there is a time difference between the rotations of the main gear 20 and the first gear 29, so as to ensure that the main support plate 39 moves before the sealing block 7, preventing the main support plate 39 and the sealing block 7 from colliding during the movement.

[0066] 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 sealing block 7 to move through four connecting rods 19. During the movement of the sealing block 7, it will drive the sealing key 8 to move. When the sealing key 8 moves, it will be slidably connected to the bottom frame 11 and the inclined block 12 through an inclined plane. Thus, it is ensured that when the sealing block 7 moves in the direction close to the annular plate 4, the sealing block 7 will also displace in the direction away from the base 9, thereby realizing the expansion of the sealing ring 5. For the comparison diagram before and after the displacement, refer to Figure 6 and Figure 7 .

[0067] When the two hydraulic motors 22 are started, due to the time difference in the start of the two hydraulic motors 22, the sealing ring 5 will be completely tightened by a number of sealing blocks 7, avoiding uneven stress on the sealing ring 5 after it is tightened, thereby affecting the effect of stopping slurry.

[0068] The above embodiments only represent one or several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A slurry stopping sealing device for a shield machine, comprising 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 wherein: Also includes: 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. The dislocation lifting 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 one 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; The dislocation 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 fixedly connected to the first gear. A limiting arc groove is formed on a 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 fixedly connected to a side of the first pulley close to the positioning plate. The dislocation 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.

2. A grout-stopping sealing device for a shield machine according to claim 1, characterized in that: 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 both formed with teeth, and the hydraulic gear is meshed with the teeth on the inner side of the arc-shaped racks.

3. The grout stopping sealing device of a shield machine according to claim 1, characterized in that: 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 ends 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.

4. A grout-stopping sealing device for a shield machine according to claim 3, characterized in that: A plurality of balls are rotatably arranged at equal intervals on one side of the main support plate close to the sealing ring.

5. The grout stopping sealing device for a shield machine according to claim 1, characterized in that: 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. 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.

6. A grout-stopping sealing device for a shield machine according to claim 5, characterized in that: 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.

7. A grout-stopping sealing device for a shield machine according to claim 6, characterized in that: 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.

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