A central rotary joint, tunneling machine

Abstract

This invention discloses a central rotary joint and a tunneling machine. The central rotary joint includes a stator assembly, within which a rotor assembly is rotatably mounted. The inner wall of the stator assembly has a modified fluid flow groove, and the inner wall of the rotor assembly has a modified fluid flow hole communicating with the modified fluid flow groove. A freezing component is disposed within the inner cavity of the rotor assembly. The tunneling machine includes the central rotary joint. Using this technical solution, the modified fluid can flow into the tunnel face through the modified fluid flow hole, thus meeting the slurry modification construction requirements of the earth pressure balance shield tunneling machine. Simultaneously, freezing or thawing media can enter the tunnel face through the freezing component, thus meeting the project requirements of the freezing method construction. Furthermore, after removing the freezing component from the rotor assembly, the inner cavity of the rotor assembly can be used to inject mud media, thus meeting the construction requirements of the earth pressure balance slurry shield tunneling machine.

Description

Technical Field

[0001] This invention relates to the field of rotary joint technology, and in particular to a center rotary joint and a tunneling machine. Background Technology

[0002] The central rotary joint of tunneling machines such as shield tunneling machines is an essential passage for soil improvement channels and a transmission component for all improvement channels on the cutterhead. Currently, earth pressure center rotary joints and slurry center rotary joints have been developed to a relatively mature stage. However, for shield tunneling machines using the freezing method, how to deliver the freezing medium to the working face without entering the chamber and connecting pipelines is a problem that urgently needs to be solved.

[0003] In recent years, the technology of central rotary joints has developed rapidly, resulting in rotary joints with various structures. For example, Chinese invention patent application CN 107387100 A, published on November 24, 2017, discloses a tunnel boring machine with cryogenic reinforcement function, including a cutterhead, a main cutterhead beam mounted on the cutterhead, a shield body, a central rotary joint, and a cryogenic unit. The central rotary joint has an input channel and an output channel. The cutterhead is equipped with a cutterhead cryogenic circulation pipeline. The inlet of the cutterhead cryogenic circulation pipeline is connected to the outlet of the input channel in the central rotary joint, and the inlet of the input channel is connected to the outlet of the cryogenic unit. The outlet of the cutterhead cryogenic circulation pipeline is connected to the inlet of the output channel in the central rotary joint, and the outlet of the output pipeline is connected to the inlet of the cryogenic unit. The shield body is equipped with a shield body cryogenic circulation pipeline. The inlet of the shield body cryogenic circulation pipeline is connected to the outlet of the cryogenic unit, and the outlet of the shield body circulation pipeline is connected to the inlet of the cryogenic unit.

[0004] The technical solution of the aforementioned invention patent application involves setting an input channel and an output channel within a central rotary joint. The input and output channels are connected to a refrigeration unit, which then delivers refrigerant to the cutter head refrigeration circulation pipeline through the central rotary joint. After reinforcement, workers can enter the chamber to work. However, this solution is only applicable to the functional requirements of refrigeration construction and cannot be simultaneously applied to earth pressure balance construction, frozen stratum construction, thawing stratum construction, or slurry balance construction. It also cannot achieve the effect of convenient conversion between earth pressure balance construction, frozen stratum construction, thawing stratum construction, and slurry balance construction.

[0005] For example, a Chinese utility model patent with an authorization announcement date of September 2, 2022, and authorization announcement number CN 217356042 U discloses a splicing type central rotary joint, which includes a fixed bracket, a front end, a rear end, and a splicing part. The front end includes a first rotating body, a first housing, and a front end cover. The first rotating body is rotatably disposed inside the first housing, and the front end cover is fitted onto the first rotating body and fixedly connected to the first housing. The first housing is fixed to the fixed bracket. The rear end includes a second rotating body, a second housing, an electric slip ring, and a rear end cover. The electric slip ring is fitted onto the left end of the second rotating body, and the second housing is fitted onto the right end of the second rotating body. The middle edge of the rear end cover is fixedly connected to the second housing, and the outer edge of the rear end cover is fixedly connected to the fixed bracket. The splicing part is disposed between the front end and the rear end, and there can be several splicing parts. The number of splicing parts can be increased or decreased as needed to achieve the required length.

[0006] The aforementioned utility model patent's technical solution features a structure that can be detached at both ends, which can adapt to the different needs of slurry rotary joints and improve production efficiency. However, it still does not solve the requirement for the function of the central rotary joint for freezing method construction, nor can it be simultaneously applied to earth pressure balance construction, frozen stratum construction, thawed stratum construction, and slurry balance construction. Furthermore, it cannot achieve the effect of convenient conversion between earth pressure balance construction, frozen stratum construction, thawed stratum construction, and slurry balance construction. Summary of the Invention

[0007] To address the shortcomings in the aforementioned background technology, this invention proposes a center rotary joint and a tunneling machine, which solves the technical problem of needing to connect pipes into the chamber or replace the rotary joint with a special one when carrying out cryogenic construction during tunneling machine construction.

[0008] The technical solution of this application is as follows:

[0009] A central rotary joint includes a stator assembly, a rotor assembly rotatably mounted within the stator assembly's inner cavity, a modified fluid flow groove on the inner wall of the stator assembly, and a modified fluid flow hole communicating with the modified fluid flow groove within the cylinder wall of the rotor assembly. A freezing component is disposed within the inner cavity of the rotor assembly. In this technical solution, the rotor assembly and stator assembly rotate in tandem, with the rotor assembly capable of rotating relative to the stator assembly around its own axis. The freezing component is interconnected with the rotor assembly and can rotate synchronously with it. Using this technical solution, modified fluid can flow into the tunnel face through the modified fluid flow hole, thus meeting the slurry modification requirements of an earth pressure balance shield tunneling machine. Simultaneously, freezing or thawing media can enter the tunnel face through the freezing component, thus meeting the project requirements for freezing method construction. Furthermore, after removing the freezing component from the rotor assembly, the inner cavity of the rotor assembly can be used to inject mud media, thus meeting the construction requirements of an earth pressure balance slurry shield tunneling machine.

[0010] Furthermore, the refrigeration assembly includes a central sleeve connected to the rotor assembly. A refrigeration pipe and a high-pressure water pipe are disposed within the central sleeve, and an insulation medium is disposed between the refrigeration pipe, the high-pressure water pipe, and the central sleeve. Based on the above technical solution, this technical solution provides a preferred central rotary joint. The refrigeration assembly includes a refrigeration pipe and a high-pressure water pipe, which can be used to transport both refrigeration and thawing media to meet the project requirements of refrigeration construction, and also to transport high-pressure water to flush the cutter head and prevent mud cake formation at the center of the cutter head. Simultaneously, an insulation medium is filled between the outer walls of the refrigeration pipe, the outer walls of the high-pressure water pipe, and the inner walls of the central sleeve for insulation during freezing or thawing.

[0011] Furthermore, the insulation medium is a polyurethane foam composite material, and the central sleeve is provided with several insulation medium injection holes. Based on the above technical solution, this technical solution provides a preferred central rotary joint, wherein the insulation medium is initially in a liquid state, and after being injected into the central sleeve, it begins to solidify into a solid structure, used for insulation during freezing construction or thawing.

[0012] Furthermore, the high-pressure water pipe is concentrically arranged with the central sleeve, and the refrigeration pipes are arranged in a ring array around the high-pressure water pipe. Based on the above technical solution, this technical solution provides a preferred central rotary joint, which can effectively utilize the internal space of the central sleeve and cooperate with the insulation medium to ensure the insulation effect during freezing and thawing construction.

[0013] Furthermore, the refrigeration assembly includes a connecting flange disposed at the outer end of the rotor assembly and the central sleeve, and the connecting flange is provided with stepped through holes for assembly with the refrigeration pipe and the high-pressure water pipe, respectively. Based on the above technical solution, this technical solution provides a preferred central rotary joint, wherein the connecting flange can be used to connect the refrigeration assembly and the rotor assembly, and can also be used to position the high-pressure water pipe and the central sleeve in the refrigeration assembly axially and circumferentially.

[0014] Furthermore, after the freezing component is removed from the rotor assembly, the rotor assembly is connected to the mud ball valve. Based on the above technical solution, this technical solution provides a preferred central rotary joint. Since the freezing component and the rotor assembly are connected by a connecting flange, they can be quickly assembled and disassembled. After removing the connecting flange, the freezing component can be pulled out of the rotor assembly. After the mud ball valve is connected to the rotor assembly, the construction of the earth pressure slurry dual-mode shield tunneling machine can be carried out.

[0015] Furthermore, the front and rear ends of the outer wall of the rotor assembly are respectively provided with bearing two and bearing three, which are assembled with the stator assembly. Bearing two is disposed between the stator flange, the rotor assembly, and the stator assembly. One end of the liquid inlet of the rotor assembly is connected to a threaded connector. The stator assembly is provided with a rear flange radially corresponding to the threaded connector. Bearing three is disposed between the stator assembly, the rotor assembly, and the threaded connector. Based on the above technical solution, this technical solution provides a preferred central rotary joint, in which the rotor assembly and the stator assembly are rotatably connected by bearing two and bearing three coaxially arranged, and the rear flange is used for axial connection of the threaded connector, the rotor assembly, and the stator assembly.

[0016] Furthermore, the outer end face of the threaded connector is provided with a rotation pointer. When the rotor assembly rotates, the rotation pointer rotates synchronously with the rotor assembly, which can quickly locate the position of the tool on the cutter head.

[0017] A tunneling machine employs the aforementioned central rotary joint. The stator flange is connected to the drive box. One end of the outlet of the refrigeration component is provided with a transition piece that fits into the central sleeve. The transition piece is connected to the cutterhead U-shaped beam and has channels respectively connecting to a modified fluid flow hole, a refrigeration pipe, and a high-pressure water pipe. Based on the above technical solution, the transition piece in this technical solution facilitates the disassembly of the refrigeration component. With this technical solution, the modified fluid can flow into the working face through the modified fluid flow hole, thus meeting the slurry modification construction requirements of the earth pressure balance shield machine. Simultaneously, the freezing or thawing medium can enter the working face through the refrigeration component, thus meeting the project requirements of the freezing method construction. In addition, after removing the refrigeration component from the rotor assembly, the inner cavity of the rotor assembly can be used to inject mud medium, thus meeting the construction requirements of the earth pressure balance slurry shield machine.

[0018] Furthermore, the transition piece is sequentially connected to the cutterhead U-beam via a connecting sleeve and a cutterhead U-beam flange. The connecting sleeve contains a piping assembly connecting the cutterhead and the channel. Based on the above technical solution, this technical solution provides a preferred tunneling machine, where the connecting sleeve can both transmit torque between the cutterhead U-beam and the rotor assembly and provide protection for the piping assembly.

[0019] Furthermore, a bearing is provided between the end of the transition member and the end of the rotor assembly, and a sealing system is provided between the transition member and the drive box. Based on the above technical solution, this technical solution provides a preferred tunneling machine, wherein the sealing system is used to prevent soil and debris in the soil chamber from entering the central rotary joint.

[0020] A tunneling machine employs the aforementioned central rotary joint, wherein one end of the rotor assembly's fluid outlet extends beyond the stator assembly, and the modified fluid flow hole is directly connected to the center position of the cutterhead. This technical solution provides another preferred tunneling machine, which directly extends the rotor assembly without using transition parts and connecting sleeves, connecting the modified fluid flow hole from the extended rotor position to the center position of the cutterhead.

[0021] Compared with the prior art, the technical solution of the present invention has the following technical effects:

[0022] The central rotary joint provided by this invention is applicable to multiple application scenarios, reducing the variety of designs and improving the adaptability of tunnel boring machines to various complex geological conditions. When earth pressure balance is required, an improved channel can be used; when it is necessary to enter the tunnel to inspect frozen strata or restore thawed strata for tunneling, a frozen channel can be used; and when slurry balance is required, a slurry channel can be used. Therefore, this invention considers multiple application scenarios to improve construction efficiency.

[0023] In terms of structural design, the freezing or thawing channels are completely physically isolated from the modified channels to prevent the coolant from corroding the seal of the rotary joint body or the channels. The freezing assembly is treated as a whole, with all pipelines placed inside the assembly. The assembly is filled with polyurethane foam composite material during assembly. The polyurethane foam composite material is made of polyurethane foam and fiber reinforcement materials, which has good thermal insulation performance and strength. It can quickly lock in the temperature during freezing or thawing construction, preventing excessive temperature loss and improving the timeliness of freezing construction. In addition, physically isolating the assembly from the rotary joint body can also improve the service life of the rotary joint itself. If the assembly is damaged due to corrosion by coolant or other media, it can be disassembled and reassembled separately without removing the rotary joint, saving time for on-site replacement inside the tunnel and improving construction efficiency and convenience. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 The entire assembly consists of a central rotary joint;

[0026] Figure 2 for Figure 1 A cross-sectional view of the AA plane;

[0027] Figure 3 for Figure 1 Cross-sectional view of the central freezing component;

[0028] Figure 4 for Figure 3 A cross-sectional view of the BB plane;

[0029] Figure 5 Schematic diagram of the center rotary joint in slurry mode

[0030] Figure 6 for Figure 5 A cross-sectional view of the C-plane.

[0031] Explanation of icon numbers:

[0032] 1. Cutter head U-shaped beam;

[0033] 2. Cutter head U-shaped beam flange;

[0034] 3. Connecting sleeve;

[0035] 4. Piping components;

[0036] 5. Drive box;

[0037] 6. Sealing system;

[0038] 7. Transition components;

[0039] 8. Bearing 1;

[0040] 9. Stator flange;

[0041] 10. Bearing 2;

[0042] 11. Stator assembly;

[0043] 12. Rotor assembly;

[0044] 13. Bearing Three;

[0045] 14. Rear flange;

[0046] 15. Threaded fasteners;

[0047] 16. Rotate the pointer;

[0048] 17. Freezing components;

[0049] 17-1, Center Sleeve;

[0050] 17-2, Refrigeration pipes;

[0051] 17-3. High-pressure water pipeline;

[0052] 17-4. Connecting flange;

[0053] 17-5. Thermal insulation medium;

[0054] 18. Mud ball valve;

[0055] 19. Mud medium;

[0056] 20. Improved fluid flow orifice;

[0057] 21. Hydraulic hole. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the core concept of the present invention and the following embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] The purpose of this invention is to develop a multi-purpose center rotary joint that can be applied to different modes and scenarios, and in most scenarios, it does not require the replacement of parts or a lot of replacement steps, thereby reducing the construction formwork change time.

[0060] To achieve the above objectives, the drive housing of the main drive unit is connected to the stator assembly of the central rotary joint, supporting the rotation of the entire central rotary joint and bearings; the stator assembly of the central rotary joint supports the overall structure of the rotary joint, providing support for the weight of the entire rotary joint; the rotor assembly of the central rotary joint provides a channel to the cutter head medium; the refrigeration assembly of the central rotary joint provides a channel to the freezing or thawing medium at the working face, and also provides space for insulation medium to maintain temperature during freezing or thawing; the cutter head U-shaped connecting beam provides an interface for connecting the rotary joint flange; the connecting sleeve of the central rotary joint provides protection for the pipeline and transmits power.

[0061] In the rotary joint of this invention, as described above, the rotary joint is divided into a stator assembly, a rotor assembly, and a refrigeration assembly. During conventional construction, bentonite or foam, or other modifying media, are injected into the face of the tunnel using channels on the rotor assembly to improve the face. When it is necessary to inspect the cutting tools or the soil chamber, a refrigeration medium is injected into the face of the tunnel using the refrigeration assembly to freeze the face and achieve atmospheric pressure entry. Conversely, when it is necessary to resume tunneling, a thawing medium can be injected through the refrigeration assembly for rapid thawing. When it is necessary to switch from earth pressure mode to slurry mode, the refrigeration assembly can be removed and the slurry circulation system can be quickly connected to achieve the slurry flushing function of the central large channel.

[0062] Therefore, based on the above description, the purpose of this invention is to realize a rotary joint for multiple application scenarios. As a result, it can be applied to earth pressure balance shield tunneling, earth pressure slurry dual-mode shield tunneling, and projects using the freezing method, thus achieving adaptability to multiple scenarios and functions.

[0063] Example 1

[0064] like Figure 1 and Figure 2 As shown, a central rotary joint includes a stator assembly 11, a rotor assembly 12 rotatably disposed within the inner cavity of the stator assembly 11, a modified fluid flow groove provided on the inner wall of the stator assembly 11, a hydraulic hole 21 and a modified fluid flow hole 20 communicating with the modified fluid flow groove provided in the inner wall of the rotor assembly 12, and a refrigeration assembly 17 disposed within the inner cavity of the rotor assembly 12.

[0065] In this technical solution, the rotor assembly 12 and the stator assembly 11 are rotatably coupled. The rotor assembly 12 can rotate relative to the stator assembly 11 around its own axis. The freezing assembly 17 is connected to the rotor assembly 12 and can rotate synchronously with the rotor assembly 12. After adopting this technical solution, the amendment fluid can flow into the working face through the amendment fluid flow hole 20, thereby meeting the slurry amendment construction of the earth pressure balance shield machine. At the same time, the freezing or thawing medium can enter the working face through the freezing assembly 17, thereby meeting the project requirements of the freezing method construction. In addition, after the freezing assembly 17 is removed from the rotor assembly 12, the inner cavity of the rotor assembly 12 can be used to inject mud medium, thereby meeting the construction requirements of the earth pressure balance slurry shield machine.

[0066] Example 2

[0067] like Figure 1 , Figure 3 and Figure 4 As shown, a central rotary joint includes a stator assembly 11, a rotor assembly 12 rotatably disposed within the inner cavity of the stator assembly 11, a modified fluid flow groove provided on the inner wall of the stator assembly 11, a hydraulic hole 21 and a modified fluid flow hole 20 communicating with the modified fluid flow groove provided in the inner wall of the rotor assembly 12, and a refrigeration assembly 17 disposed within the inner cavity of the rotor assembly 12.

[0068] Furthermore, the refrigeration assembly 17 includes a central sleeve 17-1 connected to the rotor assembly 12. The central sleeve 17-1 is provided with a refrigeration pipe 17-2 and a high-pressure water pipe 17-3. A heat insulation medium 17-5 is provided between the refrigeration pipe 17-2, the high-pressure water pipe 17-3, and the central sleeve 17-1.

[0069] Based on the above embodiments, this embodiment provides a preferred central rotary joint. The refrigeration assembly 17 includes a refrigeration pipe 17-2 and a high-pressure water pipe 17-3, which can be used to transport both refrigeration and thawing media to meet the project requirements of refrigeration construction, and can also be used to transport high-pressure water to flush the cutter head and prevent mud cake from forming in the center of the cutter head. At the same time, the outer wall of the refrigeration pipe 17-2, the outer wall of the high-pressure water pipe 17-3, and the inner wall of the central sleeve 17-1 are filled with a thermal insulation medium 17-5 for insulation during freezing or thawing.

[0070] Example 3

[0071] like Figure 1 and Figure 4 As shown, a central rotary joint includes a stator assembly 11, a rotor assembly 12 rotatably disposed within the inner cavity of the stator assembly 11, a modified fluid flow groove provided on the inner wall of the stator assembly 11, a hydraulic hole 21 and a modified fluid flow hole 20 communicating with the modified fluid flow groove provided in the inner wall of the rotor assembly 12, and a refrigeration assembly 17 disposed within the inner cavity of the rotor assembly 12.

[0072] The refrigeration assembly 17 includes a central sleeve 17-1 connected to the rotor assembly 12. The central sleeve 17-1 is provided with a refrigeration pipe 17-2 and a high-pressure water pipe 17-3. A heat insulation medium 17-5 is provided between the refrigeration pipe 17-2, the high-pressure water pipe 17-3 and the central sleeve 17-1.

[0073] Furthermore, the insulation medium 17-5 is a polyurethane foam composite material, and the central sleeve 17-1 is provided with a plurality of insulation medium injection holes. Based on the above embodiments, this embodiment provides a preferred central rotary joint, wherein the insulation medium 17-5 is initially in a liquid state, and after being injected into the central sleeve 17-1, it begins to solidify into a solid structure, for use as insulation during freezing construction or thawing.

[0074] Example 4

[0075] like Figure 1 and Figure 4 As shown, a central rotary joint includes a stator assembly 11, a rotor assembly 12 rotatably disposed within the inner cavity of the stator assembly 11, a modified fluid flow groove provided on the inner wall of the stator assembly 11, a hydraulic hole 21 and a modified fluid flow hole 20 communicating with the modified fluid flow groove provided in the inner wall of the rotor assembly 12, and a refrigeration assembly 17 disposed within the inner cavity of the rotor assembly 12.

[0076] The refrigeration assembly 17 includes a central sleeve 17-1 connected to the rotor assembly 12. The central sleeve 17-1 is provided with a refrigeration pipe 17-2 and a high-pressure water pipe 17-3. A heat insulation medium 17-5 is provided between the refrigeration pipe 17-2, the high-pressure water pipe 17-3 and the central sleeve 17-1.

[0077] The thermal insulation medium 17-5 is a polyurethane foam composite material, and the central sleeve 17-1 is provided with a number of thermal insulation medium injection holes.

[0078] Furthermore, the high-pressure water pipe 17-3 is concentrically arranged with the central sleeve 17-1, and the refrigeration pipe 17-2 is arranged in a ring array around the high-pressure water pipe 17-3. Based on the above technical solution, this technical solution provides a preferred central rotary joint, which can effectively utilize the internal space of the central sleeve 17-1 and cooperate with the insulation medium 17-5 to ensure the insulation effect during freezing and thawing construction.

[0079] Example 5

[0080] like Figure 1 and Figure 4 As shown, a central rotary joint includes a stator assembly 11, a rotor assembly 12 rotatably disposed within the inner cavity of the stator assembly 11, a modified fluid flow groove provided on the inner wall of the stator assembly 11, a hydraulic hole 21 and a modified fluid flow hole 20 communicating with the modified fluid flow groove provided in the inner wall of the rotor assembly 12, and a refrigeration assembly 17 disposed within the inner cavity of the rotor assembly 12.

[0081] The refrigeration assembly 17 includes a central sleeve 17-1 connected to the rotor assembly 12. The central sleeve 17-1 is provided with a refrigeration pipe 17-2 and a high-pressure water pipe 17-3. A heat insulation medium 17-5 is provided between the refrigeration pipe 17-2, the high-pressure water pipe 17-3 and the central sleeve 17-1.

[0082] The thermal insulation medium 17-5 is a polyurethane foam composite material, and the central sleeve 17-1 is provided with a number of thermal insulation medium injection holes.

[0083] The high-pressure water pipe 17-3 is concentrically arranged with the central sleeve 17-1, and the refrigeration pipe 17-2 is arranged in a ring array around the high-pressure water pipe 17-3.

[0084] The refrigeration assembly 17 includes a connecting flange 17-4 disposed at the outer end of the rotor assembly 12 and the central sleeve 17-1. The connecting flange 17-4 is provided with stepped through holes for assembly with the refrigeration pipe 17-2 and the high-pressure water pipe 17-3, respectively. Based on the above embodiment, this embodiment provides a preferred central rotary joint, wherein the connecting flange 17-4 can be used to connect the refrigeration assembly 17 and the rotor assembly 12, and can also be used to position the high-pressure water pipe 17-3 and the central sleeve 17-1 in the refrigeration assembly 17 axially and circumferentially.

[0085] Example 6

[0086] like Figure 1 , Figure 5 and Figure 6 As shown, a central rotary joint includes a stator assembly 11, a rotor assembly 12 rotatably disposed within the inner cavity of the stator assembly 11, a modified fluid flow groove provided on the inner wall of the stator assembly 11, a hydraulic hole 21 and a modified fluid flow hole 20 communicating with the modified fluid flow groove provided in the inner wall of the rotor assembly 12, and a refrigeration assembly 17 disposed within the inner cavity of the rotor assembly 12.

[0087] The refrigeration assembly 17 includes a central sleeve 17-1 connected to the rotor assembly 12. The central sleeve 17-1 is provided with a refrigeration pipe 17-2 and a high-pressure water pipe 17-3. A heat insulation medium 17-5 is provided between the refrigeration pipe 17-2, the high-pressure water pipe 17-3 and the central sleeve 17-1.

[0088] The thermal insulation medium 17-5 is a polyurethane foam composite material, and the central sleeve 17-1 is provided with a number of thermal insulation medium injection holes.

[0089] The high-pressure water pipe 17-3 is concentrically arranged with the central sleeve 17-1, and the refrigeration pipe 17-2 is arranged in a ring array around the high-pressure water pipe 17-3.

[0090] The refrigeration assembly 17 includes a connecting flange 17-4 disposed at the outer end of the rotor assembly 12 and the central sleeve 17-1. The connecting flange 17-4 is provided with stepped through holes for assembly with the refrigeration pipe 17-2 and the high-pressure water pipe 17-3, respectively.

[0091] After the freezing component 17 is removed from the rotor assembly 12, the rotor assembly 12 is connected to the mud ball valve 18. Based on the above embodiment, this embodiment provides a preferred center rotary joint. Since the freezing component 17 and the rotor assembly 12 are connected by a connecting flange 17-4, they can be quickly disassembled and assembled. After removing the connecting flange 17-4, the freezing component 17 can be pulled out from the rotor assembly 12. After the mud ball valve 18 is connected to the rotor assembly 12, the construction of the earth pressure slurry dual-mode shield tunneling machine can be carried out.

[0092] Example 7

[0093] like Figures 1-4 As shown, a central rotary joint includes a stator assembly 11, a rotor assembly 12 rotatably disposed within the inner cavity of the stator assembly 11, a modified fluid flow groove provided on the inner wall of the stator assembly 11, a hydraulic hole 21 and a modified fluid flow hole 20 communicating with the modified fluid flow groove provided in the inner wall of the rotor assembly 12, and a refrigeration assembly 17 disposed within the inner cavity of the rotor assembly 12.

[0094] The refrigeration assembly 17 includes a central sleeve 17-1 connected to the rotor assembly 12. The central sleeve 17-1 is provided with a refrigeration pipe 17-2 and a high-pressure water pipe 17-3. A heat insulation medium 17-5 is provided between the refrigeration pipe 17-2, the high-pressure water pipe 17-3 and the central sleeve 17-1.

[0095] The thermal insulation medium 17-5 is a polyurethane foam composite material, and the central sleeve 17-1 is provided with a number of thermal insulation medium injection holes.

[0096] The high-pressure water pipe 17-3 is concentrically arranged with the central sleeve 17-1, and the refrigeration pipe 17-2 is arranged in a ring array around the high-pressure water pipe 17-3.

[0097] The refrigeration assembly 17 includes a connecting flange 17-4 disposed at the outer end of the rotor assembly 12 and the central sleeve 17-1. The connecting flange 17-4 is provided with stepped through holes for assembly with the refrigeration pipe 17-2 and the high-pressure water pipe 17-3, respectively.

[0098] After the freezing component 17 is removed from the rotor assembly 12, the rotor assembly 12 is connected to the mud ball valve 18.

[0099] Furthermore, the front and rear ends of the outer wall of the rotor assembly 12 are respectively provided with bearing 2 10 and bearing 3 13, which are assembled with the stator assembly 11. The bearing 2 10 is disposed between the stator flange 9, the rotor assembly 12, and the stator assembly 11. One end of the liquid inlet of the rotor assembly 12 is connected to a threaded connector 15. The stator assembly 11 is provided with a rear flange 14 that is radially corresponding to the threaded connector 15. The bearing 3 13 is disposed between the stator assembly 11, the rotor assembly 12, and the threaded connector 15.

[0100] Based on the above embodiments, this embodiment provides a preferred central rotary joint, wherein the rotor assembly 12 and the stator assembly 11 are rotatably connected by bearings 10 and 13 arranged coaxially, and the rear flange 14 is used for axial connection of threaded connector 15 and rotor assembly 12 and stator assembly 11.

[0101] Example 8

[0102] like Figures 1-4 As shown, a central rotary joint includes a stator assembly 11, a rotor assembly 12 rotatably disposed within the inner cavity of the stator assembly 11, a modified fluid flow groove provided on the inner wall of the stator assembly 11, a hydraulic hole 21 and a modified fluid flow hole 20 communicating with the modified fluid flow groove provided in the inner wall of the rotor assembly 12, and a refrigeration assembly 17 disposed within the inner cavity of the rotor assembly 12.

[0103] The refrigeration assembly 17 includes a central sleeve 17-1 connected to the rotor assembly 12. The central sleeve 17-1 is provided with a refrigeration pipe 17-2 and a high-pressure water pipe 17-3. A heat insulation medium 17-5 is provided between the refrigeration pipe 17-2, the high-pressure water pipe 17-3 and the central sleeve 17-1.

[0104] The thermal insulation medium 17-5 is a polyurethane foam composite material, and the central sleeve 17-1 is provided with a number of thermal insulation medium injection holes.

[0105] The high-pressure water pipe 17-3 is concentrically arranged with the central sleeve 17-1, and the refrigeration pipe 17-2 is arranged in a ring array around the high-pressure water pipe 17-3.

[0106] The refrigeration assembly 17 includes a connecting flange 17-4 disposed at the outer end of the rotor assembly 12 and the central sleeve 17-1. The connecting flange 17-4 is provided with stepped through holes for assembly with the refrigeration pipe 17-2 and the high-pressure water pipe 17-3, respectively.

[0107] After the freezing component 17 is removed from the rotor assembly 12, the rotor assembly 12 is connected to the mud ball valve 18.

[0108] The front and rear ends of the outer wall of the rotor assembly 12 are respectively provided with bearing 2 10 and bearing 3 13, which are assembled with the stator assembly 11. The bearing 2 10 is located between the stator flange 9, the rotor assembly 12, and the stator assembly 11. One end of the liquid inlet of the rotor assembly 12 is connected to a threaded connector 15. The stator assembly 11 is provided with a rear flange 14 that is radially corresponding to the threaded connector 15. The bearing 3 13 is located between the stator assembly 11, the rotor assembly 12, and the threaded connector 15.

[0109] Furthermore, the outer end face of the threaded connector 15 is provided with a rotating pointer 16. When the rotor assembly 12 rotates, the rotating pointer 16 rotates synchronously with the rotor assembly 12, which can quickly locate the position of the tool on the cutter head.

[0110] Example 9

[0111] like Figures 1-4 As shown, a tunneling machine adopts the central rotary joint of the above embodiment. The stator flange 9 is connected to the drive box 5. One end of the liquid outlet of the refrigeration component 17 is provided with a transition piece 7 that is sleeved with the central sleeve 17-1. The transition piece 7 is connected to the cutter head U-shaped beam 1. The transition piece 7 is provided with channels that are respectively connected to the modified liquid flow hole 20, the refrigeration pipe 17-2 and the high-pressure water pipe 17-3.

[0112] Based on the above embodiments, the transition piece 7 in this embodiment facilitates the disassembly of the freezing component 17. After adopting this technical solution, the modified liquid can flow into the working face through the modified liquid flow hole 20, thereby meeting the slurry modification construction of the earth pressure balance shield machine; at the same time, the freezing or thawing medium can enter the working face through the freezing component 17, thereby meeting the project requirements of the freezing method construction; in addition, after the freezing component 17 is removed from the rotor component 12, the inner cavity of the rotor component 12 can be used to inject mud medium, thereby meeting the construction requirements of the earth pressure balance slurry shield machine.

[0113] Example 10

[0114] like Figures 1-4 As shown, a tunneling machine adopts a central rotary joint of any one of embodiments 2-8. The stator flange 9 is connected to the drive box 5. One end of the liquid outlet of the refrigeration component 17 is provided with a transition piece 7 that is sleeved with the central sleeve 17-1. The transition piece 7 is connected to the cutter head U-shaped beam 1. The transition piece 7 is provided with channels that are respectively connected to the modified liquid flow hole 20, the refrigeration pipe 17-2 and the high-pressure water pipe 17-3.

[0115] Furthermore, the transition piece 7 is sequentially connected to the cutterhead U-shaped beam 1 via the connecting sleeve 3 and the cutterhead U-shaped beam flange 2. The connecting sleeve 3 contains a pipeline assembly 4 that connects the cutterhead to the channel. Based on the above embodiment, this embodiment provides a preferred tunneling machine where the connecting sleeve 3 can both transmit the torque between the cutterhead U-shaped beam 1 and the rotor assembly 12 and provide protection for the pipeline assembly 4.

[0116] Example 11

[0117] like Figures 1-4 As shown, a tunneling machine adopts a central rotary joint as described in any of embodiments 2-8. The stator flange 9 is connected to the drive box 5. One end of the liquid outlet of the refrigeration component 17 is provided with a transition piece 7 that is sleeved with the central sleeve 17-1. The transition piece 7 is connected to the cutter head U-shaped beam 1. The transition piece 7 is provided with channels that are respectively connected to the modified liquid flow hole 20, the refrigeration pipe 17-2 and the high-pressure water pipe 17-3.

[0118] The transition piece 7 is connected to the cutter head U-beam 1 in sequence through the connecting sleeve 3 and the cutter head U-beam flange 2. The connecting sleeve 3 is provided with a pipeline assembly 4 that connects the cutter head and the channel.

[0119] Furthermore, a bearing 8 is provided between the end of the transition member 7 and the end of the rotor assembly 12, and a sealing system 6 is provided between the transition member 7 and the drive box 5. Based on the above technical solution, this technical solution provides a preferred tunneling machine, wherein the sealing system 6 is used to prevent soil and debris in the soil chamber from entering the central rotary joint.

[0120] Example 12

[0121] A tunneling machine employs a central rotary joint according to any one of embodiments 2-8, wherein one end of the fluid outlet of the rotor assembly 12 extends out of the stator assembly 11, and the modified fluid flow hole 20 is directly connected to the center position of the cutterhead. This technical solution provides another preferred tunneling machine, which directly extends the rotor assembly 12 without using the transition piece 7 and the connecting sleeve 3, connecting the modified fluid flow hole 20 from the extended rotor position to the center position of the cutterhead, as shown in the accompanying drawings.

[0122] Example 13

[0123] like Figures 1-4As shown, a central rotary joint is connected to the drive box 5 via a stator flange 9. A bearing 8 is designed in front of the rotor assembly 12 and is connected to a transition piece 7. The transition piece 7 is designed with all the channel holes. A sealing system 6 is designed between the transition piece 7 and the drive box 5 to prevent soil from entering the rotary joint. A connecting sleeve 3 is connected between the transition piece 7 and the cutter head U-shaped beam flange 2. The connecting sleeve 3 can protect the pipeline assembly 4 and transmit the torque between the cutter head U-shaped connecting beam 1 and the rotary joint through the connecting cutter head U-shaped beam flange 2.

[0124] The stator assembly 11 and the rotor assembly 12 are designed with bearing 10 and bearing 13 at both ends. The stator assembly 11 is used to provide the overall support structure for the rotary joint and has improved grooves designed on it. The rotor assembly 12 forms a medium flow channel with the groove between the stator assembly 11 through the designed channel, which can realize a separate channel for the improved medium.

[0125] The rear flange 14 is used to connect the threaded connector 15, the rotor assembly 12, and the stator assembly 11. A rotating pointer 16 is designed on the threaded connector 15. When the cutter head U-shaped beam 1 rotates, it can drive the rotor assembly 12 to rotate. The rotating pointer 16 rotates with it, which can quickly locate the position of the cutter on the cutter head.

[0126] The rotor assembly 12 contains a refrigeration assembly 17. When construction requires entering the working chamber to inspect the condition of the soil chamber or the cutting tools, or to replace the cutting tools, a refrigeration medium can be injected into the working face through the refrigeration assembly 17. The refrigeration assembly 17 consists of a central sleeve 17-1, a refrigeration pipe 17-2, a high-pressure water pipe 17-3, a connecting flange 17-4, and a thermal insulation medium 17-5.

[0127] The central sleeve 17-1 provides a protective environment and connecting support structure for the integral freezing pipe 17-2, high-pressure water pipe 17-3, and insulation medium 17-5. The freezing pipe 17-2 is located inside the freezing assembly 17, providing a channel for the freezing medium to reach the working face. The high-pressure water channel 17-3 allows high-pressure water to flow to prevent mud cake formation at the center of the cutterhead. The insulation medium 17-5 between the freezing pipe 17-2 and the central sleeve 17-1 is foamed, and n small holes are designed on the central sleeve 17-1 for uniform injection of the insulation medium 17-5. The insulation medium 17-5 is initially liquid, but after being injected into the central sleeve 17-1, it begins to solidify into a solid structure for insulation during freezing construction or thawing. This embodiment can be applied to earth pressure balance shield tunneling or freezing / thawing construction scenarios.

[0128] Example 14

[0129] like Figure 5 and Figure 6As shown, a central rotary joint, based on embodiment 13, forms a hollow cavity in the center of the entire rotary joint when the freezing component 17 is removed. After connecting the mud ball valve 18, mud medium 19 can pass through the large internal channel, and it can be used as a mud-water rotary joint to solve the problem of no cutterhead center flushing when the actual earth pressure conversion mud-water mode is used.

[0130] All aspects not detailed in this invention are conventional technical means known to those skilled in the art.

[0131] The above content shows and describes the basic principles, main features, and beneficial effects of the present invention. The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A central rotary joint, comprising a stator assembly (11), wherein a rotor assembly (12) is rotatably disposed within the inner cavity of the stator assembly (11), characterized in that: The stator assembly (11) has a modified liquid flow groove on its inner wall, and the rotor assembly (12) has a modified liquid flow hole (20) communicating with the modified liquid flow groove in its inner wall. The rotor assembly (12) has a refrigeration assembly (17) in its inner cavity, and the refrigeration assembly (17) is detachable. The refrigeration assembly (17) includes a central sleeve (17-1) connected to the rotor assembly (12). The central sleeve (17-1) is provided with a refrigeration pipe (17-2) and a high-pressure water pipe (17-3). A heat-insulating medium (17-5) is provided between the refrigeration pipe (17-2), the high-pressure water pipe (17-3), and the central sleeve (17-1).

2. The center rotary joint according to claim 1, characterized in that: The insulation medium (17-5) is a polyurethane foam composite material, and the central sleeve (17-1) is provided with a number of insulation medium injection holes.

3. The center rotary joint according to claim 1 or 2, characterized in that: The high-pressure water pipe (17-3) is concentrically arranged with the central sleeve (17-1), and the refrigeration pipe (17-2) is arranged in a ring array around the high-pressure water pipe (17-3).

4. The center rotary joint according to claim 3, characterized in that: The refrigeration assembly (17) includes a connecting flange (17-4) disposed at the outer end of the rotor assembly (12) and the central sleeve (17-1), and the connecting flange (17-4) is provided with stepped through holes for assembly with the refrigeration pipe (17-2) and the high-pressure water pipe (17-3) respectively.

5. The center rotary joint according to claim 4, characterized in that: After the freezing component (17) is removed from the rotor assembly (12), the rotor assembly (12) is connected to the mud ball valve (18).

6. The center rotary joint according to any one of claims 1-2 and 4-5, characterized in that: The front and rear ends of the outer wall of the rotor assembly (12) are respectively provided with bearing two (10) and bearing three (13) assembled with the stator assembly (11). The bearing two (10) is located between the stator flange (9), the rotor assembly (12), and the stator assembly (11). One end of the liquid inlet of the rotor assembly (12) is connected to a threaded connector (15). The stator assembly (11) is provided with a rear flange (14) that is radially corresponding to the threaded connector (15). The bearing three (13) is located between the stator assembly (11), the rotor assembly (12), and the threaded connector (15).

7. The center rotary joint according to claim 6, characterized in that: The outer end face of the threaded connector (15) is provided with a rotating pointer (16).

8. A tunneling machine, characterized in that: Using the central rotary joint as described in claim 6 or 7, the stator flange (9) is connected to the drive box (5), and one end of the liquid outlet of the refrigeration assembly (17) is provided with a transition piece (7) that is sleeved with the central sleeve (17-1). The transition piece (7) is connected to the cutter head U-shaped beam (1), and the transition piece (7) is provided with channels that are respectively connected to the modified liquid flow hole (20), the refrigeration pipe (17-2), and the high-pressure water pipe (17-3).

9. The tunneling machine according to claim 8, characterized in that: The transition piece (7) is connected to the cutter head U-beam (1) in sequence through the connecting sleeve (3) and the cutter head U-beam flange (2). The connecting sleeve (3) is provided with a pipeline assembly (4) that connects the cutter head and the channel.

10. The tunneling machine according to claim 8 or 9, characterized in that: A bearing (8) is provided between the end of the transition piece (7) and the end of the rotor assembly (12), and a sealing system (6) is provided between the transition piece (7) and the drive box (5).

11. A tunneling machine, characterized in that: Using the central rotary joint as described in any one of claims 2-7, one end of the liquid outlet of the rotor assembly (12) extends out of the stator assembly (11), and the improved liquid flow hole (20) is directly connected to the center position of the cutter head.

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