A shield machine and its central swivel joint

Abstract

The present invention discloses a shield machine and a central swivel joint thereof. The central swivel joint comprises a fixed ring, a swivel assembly and at least one group of force transmission assemblies. The fixed ring is fixedly connected to a cutter disc. Each group of force transmission assemblies is distributed in a ring shape and fixedly arranged between the fixed ring and the swivel assembly. Each group of force transmission assemblies comprises two force transmission blocks. A fan-shaped groove is arranged on the side of the swivel assembly. The two force transmission blocks first pass through the fixed ring in a radial direction and then respectively abut against the two side walls of the fan-shaped groove. Regardless of whether the cutter disc rotates clockwise or counterclockwise, the two force transmission blocks can prevent the swivel assembly from rotating circumferentially or radially relative to the fixed ring, so that the cutter disc and the swivel assembly have better alignment, effectively avoiding the sealing failure problem caused by the radial shaking of the swivel assembly relative to the cutter disc, which is conducive to reducing the failure rate and has high working reliability.

Description

Technical Field

[0001] The invention relates to the field of tunneling equipment, and in particular to a shield machine and a central swivel joint thereof. Background Art

[0002] In recent years, shield machines have been widely used in urban underground space tunnel construction. During the tunneling process, the shield machine needs to inject improvers into the front of the cutterhead and the soil bin through the central swivel joint. The improvers are usually water, foam or bentonite to prevent problems such as "mud cake".

[0003] The existing center swivel joint is usually fixedly installed on the rear plate of the soil bin, and the rotation of the shaft or the shell is driven by the rotation of the cutter disc. However, due to manufacturing errors and installation errors, when the rotation center of the cutter disc and the rotation center of the center swivel joint are not concentric, the rotating parts of the center swivel joint will be dragged or squeezed, which can easily cause the center swivel joint to shake and easily cause faults such as premature failure of the seal, affecting its working reliability. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a shield machine and a central swivel joint thereof, wherein at least one group of force transmission components is arranged between the fixed ring and the swivel component, and the two force transmission blocks of each group of force transmission components radially pass through the fixed ring and abut against the two side walls of the fan-shaped groove arranged on the side of the swivel component, thereby avoiding circumferential rotation or radial movement of the swivel component, achieving better centering and higher working reliability.

[0005] The central swivel joint of the shield machine provided by the present invention comprises a fixed ring fixedly connected to the cutter head, a swivel assembly, and at least one group of force transmission assemblies fixedly arranged between the fixed ring and the swivel assembly and distributed in a ring shape, each group of force transmission assemblies comprises two force transmission blocks which respectively pass through the fixed ring in the radial direction and abut against the two side walls of the fan-shaped groove arranged on the side of the swivel assembly.

[0006] Preferably, the rotary assembly includes a connector with a fan-shaped groove on the outside and a rotating shaft coaxially fixed to the connector, the connector is provided with at least one transition channel, the rotating shaft is provided with at least one conveying channel, and the transition channel and the conveying channel are coaxially connected in a one-to-one correspondence.

[0007] Preferably, one of the transition channels is a stepped hole, and the diameter of the stepped hole gradually decreases toward the direction approaching the cutter disc.

[0008] Preferably, the stepped hole includes a docking channel connected to the conveying channel and a pressurizing channel connected to the cutter disc, the docking channel and the conveying channel have the same aperture, and the aperture of the docking channel is larger than the aperture of the pressurizing channel.

[0009] Preferably, one of the transition channels is a cylindrical hole having a diameter equal to that of the delivery channel.

[0010] Preferably, the fixing ring is provided with at least one group of limiting grooves, each group of limiting grooves includes two limiting grooves respectively opposite to two ends of one of the fan-shaped grooves, and the limiting grooves and the force transmission block have equal widths in the circumferential direction.

[0011] Preferably, the bottom end of each force transmission block coincides with the bottom of the fan-shaped groove.

[0012] Preferably, it also includes a soil bin partition plate sleeved outside the connecting head, and a sealing component is provided between the soil bin partition plate and the connecting head.

[0013] Preferably, the sealing assembly includes a front cover and a rear cover respectively fixed on both sides of the soil bin partition, and at least one set of sealing rings located between the front cover and the rear cover and respectively abutting against the soil bin partition and the connector.

[0014] The shield machine provided by the present invention comprises the central swivel joint described in any one of the above items.

[0015] Compared with the background technology, the central swivel joint of the shield machine provided by the present invention includes a fixed ring, a swivel assembly and at least one group of force transmission assemblies. The fixed ring is fixedly connected to the cutter disc, and each group of force transmission assemblies is distributed in a ring shape and fixedly arranged between the fixed ring and the swivel assembly. Each group of force transmission assemblies includes two force transmission blocks. The side of the swivel assembly is provided with a fan-shaped groove. The two force transmission blocks first pass through the fixed ring radially, and then respectively abut against the two side walls of the fan-shaped groove. Regardless of whether the cutter disc rotates clockwise or counterclockwise, the two force transmission blocks can prevent the swivel assembly from rotating circumferentially or radially relative to the fixed ring, so that the cutter disc and the swivel assembly are better aligned, and the sealing failure problem caused by the radial shaking of the swivel assembly relative to the cutter disc is effectively avoided, which is conducive to reducing the failure rate and has high working reliability.

[0016] The shield machine provided by the present invention, including the aforementioned central swivel joint, has the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 An axial cross-sectional view of a central swivel joint of a shield machine provided by a specific embodiment of the present invention;

[0019] Figure 2 for Figure 1 AA section view when only half of the force transmission block is installed;

[0020] Figure 3 for Figure 1 AA section view when all force transmission blocks are installed.

[0021] The reference numerals are as follows:

[0022] Cutter head 1, fixing ring 2, connector 3, rotating shaft 4, force transmission block 5, soil bin partition 6, adapter sleeve 7 and sealing assembly 8;

[0023] Limiting groove 21;

[0024] Sector-shaped groove 31 and transition channel 32;

[0025] A docking channel 321 and a pressurizing channel 322;

[0026] A conveying channel 41;

[0027] Front end cover 81 , rear end cover 82 and sealing ring 83 . DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Please refer to Figures 1 to 3 , Figure 1 An axial cross-sectional view of a central swivel joint of a shield machine provided by a specific embodiment of the present invention; Figure 2 for Figure 1 AA section view when only half of the force transmission block is installed; Figure 3 for Figure 1 AA section view when all force transmission blocks are installed.

[0031] The embodiment of the present invention discloses a central swivel joint of a shield machine. The key invention point is that at least one group of force transmission components is provided between the fixed ring 2 and the swivel component. The two force transmission blocks 5 of each group of force transmission components radially pass through the fixed ring 2 and abut against the two side walls of the fan-shaped groove 31 provided on the side of the swivel component, so that the fixed ring 2 and the swivel component have better alignment and higher working reliability.

[0032] The central swivel joint provided by the present invention comprises a fixing ring 2, a swivel assembly and at least one set of force transmission assemblies, wherein the fixing ring 2 is in a circular ring shape and is fixedly connected to the rear end of the cutter disc 1.

[0033] The rotary assembly includes a connector 3 and a rotating shaft 4, and the rotating shaft 4 is coaxially fixed to the connector 3 by bolts. At least one fan-shaped groove 31 is provided on the outside of the connector 3, and all the fan-shaped grooves 31 are evenly distributed along the circumference of the connector 3. The number of fan-shaped grooves 31 is the same as that of the force transmission assembly. Specifically, the connector 3 is provided with three fan-shaped grooves 31 extending along the axial direction of the connector 3, and accordingly, three groups of force transmission assemblies are provided between the fixing ring 2 and the rotary assembly. The connector 3 can be a connecting flange, but is not limited thereto.

[0034] Each group of force transmission components is evenly distributed in a circular ring shape and is fixed between the fixed ring 2 and the rotating component so that the fixed ring 2 and the rotating component are coaxially fixedly connected. Each group of force transmission components includes two force transmission blocks 5. A fan-shaped groove 31 is provided on the side of the rotating component. The two force transmission blocks 5 first pass through the fixed ring 2 radially, and then respectively abut against the two side walls of the fan-shaped groove 31. Regardless of whether the cutter disc 1 rotates clockwise or counterclockwise, the two force transmission blocks 5 can push the side walls of the fan-shaped groove 31 to drive the rotating component to rotate synchronously with the cutter disc 1, so that the rotating component can withstand bidirectional torque. In addition, the two force transmission blocks 5 can prevent the rotating component from rotating circumferentially or radially relative to the fixed ring 2, so that the centering of the cutter disc 1 and the rotating component is better, and the sealing failure problem caused by the radial shaking of the rotating component relative to the cutter disc 1 is effectively avoided, which is conducive to reducing the failure rate and has high working reliability.

[0035] In addition to improving the centering performance, when assembling each group of force transmission components, it is only necessary to first insert the force transmission block 5 radially. When the force transmission block 5 is against the side wall of the fan-shaped groove 31, the force transmission block 5 is then removably fixed to the fixed ring 2 with bolts. In this way, the arrangement of each group of force transmission components is also conducive to the convenient disassembly and assembly of the fixed ring 2 and the rotating component.

[0036] It should also be noted that in order to achieve quick assembly, one of the force transmission blocks 5 of each force transmission component can be installed first, and then the cutter disc 1 can be rotated. The cutter disc 1 drives the fixed ring 2 to rotate relative to the rotating component. When the first installed force transmission block 5 abuts against one side wall of the fan-shaped groove 31, the rotation of the cutter disc 1 is stopped, and the fixed ring 2 is stationary relative to the rotating component. At this time, another force transmission block 5 of each force transmission component can be installed.

[0037] In summary, the central swivel joint of the shield machine provided by the present invention has high working reliability.

[0038] The connector 3 is provided with at least one transition channel 32 penetrating along the axial direction, and the rotating shaft 4 is provided with at least one conveying channel 41 penetrating along the axial direction. All transition channels 32 and all conveying channels 41 are coaxially connected in a one-to-one correspondence, and are used to convey the improver to the cutter disc 1.

[0039] The transition channel 32 may be of more than one type, and the delivery channel 41 may have more than one aperture, so that different flow rates of the improver may be sprayed toward the cutter head 1 .

[0040] One of the transition channels 32 may be a stepped hole, the aperture of which gradually decreases toward the direction close to the cutter disc 1, so that the transition channel 32 can pressurize the modifier flowing through it, which can not only provide high-pressure modifier to the cutter disc 1, but also prevent the modifier from clogging the transition channel 32. The stepped hole may be a combination of two through holes with different apertures, including a docking channel 321 and a boosting channel 322, the docking channel 321 and the conveying channel 41 are coaxially connected, and the apertures of the docking channel 321 and the conveying channel 41 are equal, and the aperture of the docking channel 321 is larger than the aperture of the boosting channel 322. Specifically, the aperture of the docking channel 321 is twice that of the boosting channel 322. Of course, the structure of the stepped hole is not limited thereto, for example, it includes three through holes with different apertures. However, no matter what the structure of the stepped hole is, the aperture of the through hole at the farthest end of the stepped hole from the cutter disc 1 must be equal to the aperture of the conveying channel 41 to avoid leakage at the connection between the connector 3 and the rotating shaft 4.

[0041] One of the transition channels 32 can also be a cylindrical hole with a constant aperture. The aperture of the cylindrical hole is equal to the aperture of the conveying channel 41, but the apertures of the cylindrical hole and the conveying channel 41 can be between the above-mentioned docking channel 321 and the boosting channel 322, and of course can also be equal to one of the two, so as to facilitate the adjustment of the flow rate of the improver to meet the different working conditions of the cutter disc 1.

[0042] The fixing ring 2 is provided with at least one group of limiting grooves, each group of limiting grooves includes two limiting grooves 21, and the two limiting grooves 21 are respectively opposite to the two ends of one of the fan-shaped grooves 31, so that the force transmission block 5 passing through the limiting grooves 21 just abuts against the side wall of the fan-shaped groove 31. The central angle of the two limiting grooves 21 is equal to the angle of the opposite fan-shaped groove 31. It should be noted that the widths of the limiting grooves 21 and the force transmission block 5 in the circumferential direction are equal to prevent the slewing of the rotating assembly relative to the fixing ring 2 in the circumferential direction.

[0043] To improve reliability, the bottom end of each force transmission block 5 is consistent with the bottom of the fan-shaped groove 31. For example, the bottom end of the force transmission block 5 and the bottom of the fan-shaped groove 31 can be arc-shaped, thereby increasing the contact area between the force transmission block 5 and the fan-shaped groove 31 and enhancing the stopping effect of the force transmission block 5.

[0044] The central swivel joint of the shield machine provided by the present invention also includes a soil bin partition 6 and an adapter sleeve 7. The soil bin partition 6 is sleeved outside the connecting head 3, and the adapter sleeve 7 is located outside the rotating shaft 4. The two ends of the adapter sleeve 7 are respectively fixedly connected to the soil bin partition 6 and the outer shell, which can be specifically connected by bolts.

[0045] A sealing assembly 8 is provided between the soil bin partition 6 and the connector 3 to prevent mud from flowing into between the connector 3 and the rotating shaft 4 or into the rotating shaft 4 .

[0046] The sealing assembly 8 includes a front cover 81, a rear cover 82 and at least one set of sealing rings 83. The front cover 81 and the rear cover 82 are respectively fixed on both sides of the soil bin partition 6 by bolts. All the sealing rings 83 are located between the front cover 81 and the rear cover 82. The inner side of each sealing ring 83 abuts against the outer side of the connector 3. The outer side of each sealing ring 83 abuts against the wall of the mounting hole set in the center of the soil bin partition 6 to seal the gap between the soil bin partition 6 and the connector 3. Specifically, the sealing assembly 8 includes three sets of coaxially arranged lip-shaped rubber sealing rings, but the type and number of the sealing rings 83 are not limited thereto.

[0047] The present invention also discloses a shield machine, comprising the above-mentioned central swivel joint, which has the same beneficial effects.

[0048] The shield machine and the center swivel joint thereof provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and the scope of application. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A central swivel joint of a shield machine, characterized in that: It comprises a fixed ring (2) fixedly connected to the cutter disc (1), a rotary assembly, and at least one group of force transmission assemblies fixedly arranged between the fixed ring (2) and the rotary assembly and distributed in an annular shape, wherein each group of the force transmission assemblies comprises two force transmission blocks (5) which respectively pass through the fixed ring (2) in the radial direction and abut against the side walls of the fan-shaped groove (31) provided on the side of the rotary assembly; The rotary assembly comprises a connector (3) having the fan-shaped groove (31) on its outer side and a rotating shaft (4) coaxially fixedly connected to the connector (3), the connector (3) being provided with at least one transition channel (32), the rotating shaft (4) being provided with at least one conveying channel (41), the transition channel (32) being coaxially connected to the conveying channel (41) in a one-to-one correspondence; One of the transition channels (32) is a stepped hole, the diameter of which gradually decreases in a direction approaching the cutter disc (1); and one of the transition channels (32) is a cylindrical hole having a diameter equal to that of the conveying channel (41).

2. The central swivel joint of the shield machine according to claim 1, characterized in that: The stepped hole comprises a docking channel (321) connected to the delivery channel (41) and a pressurizing channel (332) connected to the cutter disc (1); the docking channel (321) and the delivery channel (41) have the same aperture, and the aperture of the docking channel (321) is larger than the aperture of the pressurizing channel (332).

3. The central swivel joint of the shield machine according to claim 1, characterized in that: The fixing ring (2) is provided with at least one group of limiting grooves, each group of the limiting grooves comprising two limiting grooves (21) respectively opposite to two ends of one of the fan-shaped grooves (31), and the limiting grooves (21) and the force transmission block (5) have equal widths in the circumferential direction.

4. The central swivel joint of the shield machine according to claim 1, characterized in that: The bottom end of each of the force transmission blocks (5) matches the bottom of the sector-shaped groove (31).

5. The central swivel joint of the shield machine according to claim 1, characterized in that: It also comprises a soil bin partition plate (6) sleeved outside the connecting head (3), and a sealing component (8) is provided between the soil bin partition plate (6) and the connecting head (3).

6. The central swivel joint of the shield machine according to claim 5, characterized in that: The sealing assembly (8) comprises a front end cover (81) and a rear end cover (82) respectively fixed to both sides of the soil bin partition (6), and at least one set of sealing rings (83) located between the front end cover (81) and the rear end cover (82) and respectively abutting against the soil bin partition (6) and the connecting head (3).

7. A shield machine, characterized in that: The invention comprises the central swivel joint as claimed in any one of claims 1 to 6.

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