Electrical connection device and method for a shield machine cutter drum

Abstract

The application discloses a shield machine cutter cylinder electrical connection device and method, and mainly solves the technical problem of high leakage risk of a hydraulic hose in the prior art. The device comprises a pressure-bearing seat for fixedly connecting to an end cover of a cutter cylinder, and a wire outlet seat for correspondingly inserting into the pressure-bearing seat. The pressure-bearing electrical plug of the pressure-bearing seat is provided with a pressure-bearing seal. The pressure-bearing seat effectively isolates the pressure zone inside the cutter cylinder from the normal pressure zone, and can avoid the problem that, after the protective hydraulic hose inside the cutter cylinder is damaged in harsh working conditions, pressure slurry leaks along the protective hydraulic hose. In addition, the two pressure-bearing sealing rings, the wire outlet sealing ring and the radial sealing ring can effectively prevent high-pressure water from invading the electrical connection device. Meanwhile, based on the guide structure design between the pressure-bearing electrical plug, the insertion groove and the socket, the connection and insertion relationship between the pressure-bearing seat and the wire outlet seat is unique, which avoids the risk of device damage or no signal caused by errors.

Description

Technical Field

[0001] This application relates to the field of tunnel boring machines, specifically to an electrical connection device and method for the cutterhead of a tunnel boring machine. Background Technology

[0002] In the field of tunnel boring machine (TBM) construction, the monitoring sensors located at the front end of the TBM cutterhead operate under harsh conditions such as high-pressure water immersion, strong vibration, collision impact, oil and mud pollution for a long time. This poses a severe challenge to the safety of the monitoring sensors. Under the above-mentioned complex application conditions, it is necessary to effectively ensure that the connection and transmission of the sensors and their signals have reliable protection capabilities to meet the long-term working requirements.

[0003] While the sensor housing itself can be protected using metal, which is relatively easy to implement, the protection of the signal transmission cables and electrical interfaces for cutterhead sensors used in tunnel boring machine (TBM) construction environments often employs protective hydraulic hoses. The sensor cables within these hoses are protected by the hydraulic hoses before being led out along with the main cable and connected to the sensor acquisition and control circuit. However, due to the extremely complex conditions faced by TBMs during excavation, including the abrasion from flowing soil, mechanical rotation, and rock-breaking vibrations within the cutterhead chamber, the risk of the protective hydraulic hoses being worn through over long-term operation is extremely high. Since the cable within the hydraulic protective hose is electrically connected to the acquisition and control circuit, if the hydraulic hose is worn through, high-pressure slurry will enter the hose, damaging the acquisition and control circuit. When the acquisition and control circuit is damaged, the monitoring sensors on the TBM cutterhead will be unable to pick up signals properly, severely impacting the safety of TBM construction. However, restoring and replacing the faulty acquisition and control circuit and the worn-through hydraulic protective hose is time-consuming, costly, and will delay the project schedule.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] In view of at least one of the above technical problems, this disclosure provides an electrical connection device and method for the cutterhead of a tunnel boring machine, which mainly solves the technical problem of high leakage risk of hydraulic hoses in the prior art.

[0006] According to one aspect of this disclosure, an electrical connection device for a tunnel boring machine cutterhead is provided, comprising a pressure-bearing seat for fixed connection to the cutterhead end cover and a cable outlet for corresponding insertion into the pressure-bearing seat; the pressure-bearing seat includes a pressure-bearing seat body with a pressure-bearing plug hole at its center, a pressure-bearing electrical plug correspondingly and sealed through and fixed in the pressure-bearing plug hole, and a pressure-bearing seal disposed on the end face of the pressure-bearing seat body for contacting the cutterhead end cover; a slot for inserting the cable outlet is provided on the side of the pressure-bearing seat body away from the cutterhead; the cable outlet includes a cable outlet body with a cable outlet hole, a socket correspondingly and sealed to the cable outlet hole and having a cable outlet plug hole at its center that matches the slot, and a plug cable fixed to the cable outlet plug hole; a radial sealing ring is embedded on the outer edge surface of the cable outlet body correspondingly embedded in the slot.

[0007] In some embodiments of this disclosure, the pressure-bearing seat body has a pressure-bearing seat step concentric with the pressure-bearing plug hole on the side corresponding to the cutter barrel. Pressure-bearing seals are respectively provided on the outer edge of the pressure-bearing seat step and on the end face of the pressure-bearing seat body that contacts the cutter barrel end cap. The pressure-bearing seal includes a pressure-bearing sealing groove formed on the corresponding surface and a pressure-bearing sealing ring embedded in the pressure-bearing sealing groove.

[0008] In some embodiments of this disclosure, a positioning shoulder is provided on one side of the pressure-bearing electrical plug and a plug seal is provided between the positioning shoulder and the corresponding end face of the pressure-bearing plug hole; an external thread is provided on the outer edge of the other side of the pressure-bearing electrical plug, and the pressure-bearing electrical plug is threaded to the plug nut at the external thread and correspondingly sealed and fixed to the pressure-bearing plug hole.

[0009] In some embodiments of this disclosure, the slot has a non-circular cross-section along the axis perpendicular to the pressure-bearing plug hole, and the outer edge profile of the socket matches the inner edge profile of the slot.

[0010] In some embodiments of this disclosure, the end face of the cable outlet body that contacts the socket is provided with a cable outlet sealing groove, and a cable outlet sealing ring is provided in the cable outlet sealing groove.

[0011] In some embodiments of this disclosure, the socket is fixedly connected to the corresponding end face of the outlet body by socket bolts.

[0012] In some embodiments of this disclosure, the plug cable includes a mounting head for passing through the outlet plug hole and having external threads, a limiting shoulder provided on the corresponding end side of the mounting head, and a fastening nut that is threadedly connected to the mounting head.

[0013] In some embodiments of this disclosure, the outlet seat and the pressure bearing seat are fastened together by corresponding bolts.

[0014] In some embodiments of this disclosure, a skid groove is provided at the outer edge of the end face that corresponds to the contact between the cable outlet and the pressure bearing seat, and / or a set screw hole parallel to the axial direction of the socket is provided at the outer end face of the cable outlet.

[0015] According to another aspect of this disclosure, a method for electrical connection of a tunnel boring machine cutterhead is provided, which is implemented based on the above-mentioned electrical connection device for a tunnel boring machine cutterhead. After the sensor installed inside the cutterhead end cover is electrically connected to the pressure-bearing electrical plug, the pressure-bearing seat is fixed to the corresponding position of the cutterhead end cover by bolts, and the cable led out from the cable outlet hole of the cable outlet is electrically connected to the acquisition and control unit after being protected by a hydraulic pipe. When the sensor signal is acquired, the socket of the cable outlet is inserted into the slot of the pressure-bearing seat and tightened.

[0016] One or more technical solutions provided in this application embodiment have at least the following technical effects or advantages: The pressure-bearing electrical plug of the pressure-bearing seat is equipped with a pressure-bearing seal. On the one hand, the pressure-bearing seat effectively isolates the pressurized area inside and outside the knife barrel from the normal pressure area. On the other hand, it avoids the problem of pressure slurry leaking along the protective hydraulic hose after the protective hydraulic hose inside the knife barrel is damaged under harsh working conditions, effectively blocking the leakage path. In addition, the two pressure-bearing sealing rings, as well as the outlet sealing ring and radial sealing ring, achieve waterproof capability inside and outside the electrical connection device, which can effectively prevent the intrusion of external high-pressure water. At the same time, based on the guide structure design between the pressure-bearing electrical plug and the slot and socket, the connection and insertion relationship between the pressure-bearing seat and the outlet seat is unique, avoiding the risk of device damage or no signal caused by incorrect insertion. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the electrical connection device for the knife barrel in one embodiment of this application.

[0018] Figure 2 This is a schematic cross-sectional view of the pressure bearing seat in one embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the structure of a pressure-bearing electrical plug in one embodiment of this application.

[0020] Figure 4 This is a schematic cross-sectional view of the cable outlet in one embodiment of this application.

[0021] Figure 5 This is a physical diagram of the electrical connection device for the knife barrel in one embodiment of this application.

[0022] In the above figures, 1 is the pressure seat, 11 is the pressure seat body, 12 is the pressure seat fixing hole, 13 is the pressure-bearing electrical plug, 131 is the positioning shoulder, 132 is the plug nut, 133 is the elastic sealing ring, 134 is the limiting surface, 14 is the pressure seat step, 15 is the pressure seal, 16 is the slot, 17 is the plug ring, 2 is the cable outlet, 21 is the cable outlet body, 22 is the cable outlet hole, 23 is the socket, 24 is the socket bolt, 25 is the plug cable, 251 is the limiting shoulder, 252 is the fastening nut, 26 is the cable outlet sealing ring, 27 is the radial sealing ring, 31 is the connecting hole, 32 is the fastening hole, 4 is the skid groove, 5 is the set screw hole, 6 is the knife barrel end cap, 7 is the knife barrel electrical connection device, and 8 is the data acquisition controller. Detailed Implementation

[0023] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "vertical," "horizontal," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "connection" and "linkage" in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0024] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Currently, the signal transmission cables and electrical interfaces of the cutterhead sensors in tunnel boring machines (TBMs) are primarily protected by hydraulic hoses. However, due to the abrasion caused by the flow of excavated soil within the cutterhead chamber, mechanical rotation, and rock-breaking vibrations during TBM excavation, these protective hydraulic hoses are at extremely high risk of wear-through. This allows high-pressure slurry to enter the worn-through hydraulic hoses, damaging the acquisition and control circuitry. Consequently, the monitoring sensors at the TBM cutterhead cannot properly acquire signals, severely impacting the safety of TBM construction. Furthermore, restoring and replacing faulty acquisition and control circuitry and worn-through hydraulic hoses requires downtime, causing project delays and incurring high maintenance costs. Therefore, this paper discloses an electrical connection device for the TBM cutterhead. This device effectively protects the electrical connection interface between the sensors and external acquisition and measurement circuitry under harsh working conditions and, considering the needs of replacement and disassembly, enables quick-connect connections. For details, see [link to details]. Figure 1The electrical connection device for the cutterhead of the tunnel boring machine includes a pressure-bearing seat 1 for fixing to the end cover of the cutterhead, and a cable outlet seat 2 for correspondingly plugging into the pressure-bearing seat 1. Thus, a quick and sealed electrical connection relationship is established between the inside and outside of the cutterhead through the quick-connect connection between the cable outlet seat 2 and the pressure-bearing seat 1. Both the pressure-bearing seat 1 and the cable outlet seat 2 are made of metal to ensure good anti-collision effect.

[0026] See Figure 2 The pressure-bearing seat 1 includes a pressure-bearing seat body 11. Several pressure-bearing seat fixing holes 12 are respectively formed around the pressure-bearing seat body 11 along its axial direction. Corresponding mounting holes are provided at the corresponding positions of the cutter barrel end cap. Thus, bolts passing through the pressure-bearing seat fixing holes 12 are screwed into the mounting holes at the cutter barrel end cap, thereby fixing the pressure-bearing seat body 11 to the cutter barrel end cap. In addition, to achieve electrical connection between the two sides of the cutter barrel, a pressure-bearing plug hole is formed along its axial direction at the pressure-bearing seat body 11. A pressure-bearing electrical plug 13 passes through this pressure-bearing plug hole, through which the cable inside the cutter barrel is led out to the outside of the cutter barrel for plug-in electrical connection.

[0027] In this embodiment, to facilitate accurate alignment of the pressure-bearing seat 11 with the end cap of the cutter barrel before bolt tightening, a pressure-bearing seat step 14 is provided on the side of the pressure-bearing seat 11 near the end cap of the cutter barrel. The diameter of the pressure-bearing seat step 14 matches the diameter of the cable hole at the end cap of the cutter barrel and is concentrically arranged with the pressure-bearing plug hole. Thus, during assembly, by inserting the pressure-bearing seat step 14 into the corresponding cable hole at the end cap of the cutter barrel, the initial positioning of the pressure-bearing seat 11 can be achieved, which facilitates the subsequent alignment of the bolts inserted into the fixing holes 12 of each pressure-bearing seat with the corresponding mounting holes at the end cap of the cutter barrel. At the same time, the pressure-bearing seat step 14 embedded in the cable hole of the end cap of the cutter barrel can also achieve sealing of the cable hole, which helps to improve the sealing effect.

[0028] However, considering that the cutterhead is filled with pressurized grout during tunnel boring machine operation, to prevent the grout from flowing out from the gap between the cable hole of the cutterhead end cover and the pressure seat step 14, in this embodiment, see... Figure 2Pressure seals 15 are provided at the outer edge of the pressure seat step 14 and at the end face of the pressure seat body 11 that contacts the cutter barrel end cover. Specifically, in this example, the pressure seal 15 includes pressure sealing grooves respectively opened at the outer edge of the pressure seat step 14 and at the end face of the pressure seat body 11 that contacts the cutter barrel end cover, and corresponding pressure sealing rings are embedded in the two pressure sealing grooves. Thus, when the pressure seat 1 is fastened to the cutter barrel end cover by bolts passing through the pressure seat fixing hole 12, the pressure sealing ring at the outer edge of the pressure seat step 14 is tightly fitted and deformed into contact with the inner edge of the cable hole at the cutter barrel end cover, while the pressure sealing ring at the cutter barrel side end face of the pressure seat body 11 is pressed and tightly contacts the cutter barrel end cover, thereby forming a double seal on the leakage path, effectively preventing the pressure drop inside the cutter barrel from causing leakage along the gap between the pressure seat body 11 and the cutter barrel end cover.

[0029] The pressure seal 15 effectively seals the overflow gap between the pressure seat 11 and the cutter barrel end cap, preventing the pressure slurry from leaking out. However, there is also a small gap between the pressure-bearing electrical plug 13, which passes through the pressure-bearing plug hole at the center of the pressure seat 11, and the wall of the pressure-bearing plug hole, which also poses a risk of slurry leakage. Therefore, in this embodiment, see... Figure 2 A plug seal is provided between the pressure-bearing electrical plug 13 and the pressure-bearing plug hole. Specifically, in this example, the side of the pressure-bearing base 11 away from the knife barrel is provided with a corresponding insertion slot 16 for the cable outlet, and a corresponding annular plug ring 17 extends into the slot side of the pressure-bearing plug hole, the inner diameter of which is consistent with the inner diameter of the pressure-bearing plug hole.

[0030] See Figure 3 One end of the pressure-bearing electrical plug 13 is provided with a positioning shoulder 131, and in this example, an external thread is formed on the outer edge surface of the pressure-bearing electrical plug 13 to form an external thread portion. Figure 3 (Not shown in the image) Meanwhile, a plug nut 132 is threaded onto the external thread of the pressure-bearing electrical plug 13. Thus, when the pressure-bearing electrical plug 13 is inserted into the pressure-bearing plug hole, the positioning shoulder 131 of the pressure-bearing electrical plug abuts against the plug ring 17, thereby limiting the assembly position on that side. On the other side, by tightening the plug nut 132, it abuts against the pressure-bearing seat step 14, thereby fixing the pressure-bearing electrical plug in the pressure-bearing plug hole.

[0031] In some other embodiments, to prevent the plug nut 132 from loosening due to vibrations from the tunnel boring machine, an elastic washer is provided between the end face of the bearing seat step 14 and the plug nut 132 to absorb vibration energy and reduce the risk of loosening. Meanwhile, considering that tightening the plug 132 alone cannot effectively isolate the overflow path, and overflow gaps may still exist at the plug nut, therefore, see [reference needed]. Figure 2In this embodiment, a plug seal is provided between the positioning shoulder 131 and the plug ring 17. Specifically, in this example, an annular sealing groove is opened at the end face of the positioning shoulder 131 that is used to contact the plug ring 17, and an elastic sealing ring 133 is filled in the sealing groove. So that after the plug nut 132 is tightened, the positioning shoulder 131 presses the elastic sealing ring to deform it, thereby achieving a seal between the pressure-bearing electrical plug and the pressure-bearing plug hole.

[0032] To prevent the pressure-bearing electrical plug 13 from rotating within the pressure-bearing plug hole, thereby affecting the quick-connection and sealing effect, in this embodiment, see... Figure 3 The outer edge of the pressure-bearing electrical plug is provided with a limiting surface 134, and the inner edge contour of the pressure-bearing plug hole matches the outer edge contour of the pressure-bearing electrical plug. Thus, the limiting surface 134 ensures that the cross-section of the pressure-bearing electrical plug perpendicular to its axial direction is non-circular, thereby preventing relative rotation of the pressure-bearing electrical plug 13 within the pressure-bearing plug hole. Furthermore, in this embodiment, the pressure-bearing electrical plug 13 specifically adopts an electrical plug with a 2MPa protection capability, using a crescent shape with a 3-pin socket and 3-pin connector. Therefore, the limiting surface 134 ensures the stability of the socket and pin positions of the pressure-bearing electrical plug 13, thereby ensuring accurate insertion during subsequent quick-connect operations.

[0033] Because the pressure-bearing electrical plug has special insertion direction requirements, in order to avoid incorrect insertion of the outlet socket 2, in this embodiment, the slot 16 at the pressure-bearing socket 1 has a non-circular profile along the cross-section perpendicular to the axial direction of the pressure-bearing plug hole, and the outer edge profile of the socket at the outlet socket matches the inner edge profile of the slot 16, thereby ensuring the uniqueness of the insertion direction of the outlet socket 2.

[0034] See Figure 4 The cable outlet includes a cable outlet body 21, which has a cable outlet hole 22 for threading cables. In this example, for ease of use in practical engineering, the cable outlet hole 22 is designed as an L-shape. See also... Figure 4 To facilitate the insertion and mating between the outlet socket 2 and the pressure bearing seat 1, a socket 23 is fixedly provided at the corresponding end face of the outlet socket 21. In this embodiment, the socket 23 has several fixed through holes for inserting socket bolts 24, and the outlet socket 21 has corresponding bolt holes at the positions of each fixed through hole. Thus, by screwing the socket bolts 24 through the fixed through holes into the bolt holes of the outlet socket 21, a stable connection between the socket 23 and the outlet socket 21 is achieved. Furthermore, to facilitate accurate alignment between the socket 23 and the slot 16, in this example, the outer edge contour of the socket 23 matches the inner edge contour of the slot 16, thereby ensuring the uniqueness of the orientation when the outlet socket 2 and the pressure bearing seat 1 are mated. For pressure sealing after the socket 23 and the outlet socket 21 are assembled, see [link to documentation]. Figure 4In this example, a cable outlet sealing groove is provided on the end face of the cable outlet body 21 that contacts the socket 23, and a cable outlet sealing ring 26 is provided in the cable outlet sealing groove. Thus, when the socket 23 is fastened to the cable outlet body 21 by the socket bolt 24, the socket 23 presses against the cable outlet sealing ring 26 to achieve a pressure-bearing seal.

[0035] Additionally, see Figure 4 In this embodiment, a cable outlet hole for passing through and fixing the plug cable 25 is provided at the center of the socket 23. This cable outlet hole is coaxially arranged with the cable outlet hole on the corresponding end face of the cable outlet body 21. Thus, the socket 23 serves as a fixing carrier for the plug cable 25, and the plug cable 25 is led out from the hole through the cable outlet hole. For reliable fixing of the plug cable 25 at the cable outlet hole, see [link to documentation]. Figure 4 In this example, the plug cable 25 includes a mounting head whose outer contour matches the contour of the outlet plug hole. A limiting shoulder 251 is provided on the side of the mounting head away from the outlet socket 2. Furthermore, an external thread is provided on the outer edge of the mounting head, and a fastening nut 252 is threadedly connected to this external thread. See also... Figure 4 After the mounting head is inserted into the outlet plug hole, the limiting shoulder 251 and the socket 23 are positioned to limit the movement. Once the fastening nut 252 is tightened until it makes tight contact with the corresponding end face of the socket 23, the plug cable 25 is securely installed at the outlet plug hole of the socket. In some other embodiments, an elastic washer is provided on the mounting head between the end face of the fastening nut 252 and the socket 23 to reduce the adverse effects of vibration on the fastening effect of the fastening nut.

[0036] Furthermore, to prevent external liquid from entering through the gap between the outlet connector 2 and the pressure seat 1 when the outlet connector 2 is inserted into the pressure seat 1, see [link to relevant documentation]. Figure 4 In this example, a radial sealing ring 27 is embedded on the outer edge of the outlet seat 21, which is correspondingly embedded in the slot 16. Thus, the radial sealing ring 27 seals the leakage path between the outlet seat 2 and the pressure seat 1.

[0037] During electrical connection, the socket 23 of the cable outlet 2 is inserted into the slot 16 of the pressure bearing seat 1 to establish an electrical connection between the inner and outer cables of the knife barrel. To improve the stability of the connection, in this embodiment, see... Figure 1 The outer edge of the outlet seat 2 is provided with several connecting holes 31, and the corresponding position of the pressure seat 1 is provided with a fastening hole 32 coaxial with the corresponding connecting hole. Thus, the connection between the pressure seat 1 and the outlet seat 2 is stabilized by fastening bolts that are threaded to the connecting holes 31 and the fastening holes 32, so as to avoid the problem of connection disconnection and affecting the monitoring signal due to external force.

[0038] In practice, the inventors discovered that there is significant resistance when disconnecting the connection between the pressure-bearing electrical plug 13 and the plug cable 25, making it difficult to directly disconnect the connection by pulling. Therefore, in this embodiment, see... Figure 1 A pry groove 4 is provided at the outer edge of the end face where the outlet seat 2 and the pressure seat 1 correspond to each other. Inserting a tool into the pry groove 4 allows for easy prying apart of the connection between the pressure seat and the outlet seat. Furthermore, in this embodiment, see... Figure 1 Considering that under certain working conditions, due to the limited operating space, it is difficult to insert the skid into the skid slot 4 from the side, in order to disconnect the insertion relationship between the outlet seat 2 and the pressure seat 1, in this example, a set screw hole 5 parallel to the socket axis is opened on the outer end face of the outlet seat 2. Thus, by screwing the set screw into the set screw hole 5, after the end of the set screw contacts the pressure seat 1, the outlet seat 2 gradually separates from the pressure seat 1.

[0039] Furthermore, this example also discloses an electrical connection method for the cutterhead of a tunnel boring machine (TBM), which is implemented based on the aforementioned electrical connection device for the cutterhead. First, the sensor inside the cutterhead end cover is fixed to the corresponding position inside the cutterhead. Then, the sensor's cable plug is passed through the corresponding mounting hole on the cutterhead end cover and electrically connected to the pressure-bearing electrical plug of the pressure-bearing seat. See [reference needed]. Figure 5 The pressure-bearing seat is fixedly installed at the cutterhead end cover 6, and bolt retainers are used on each bolt during installation to prevent loosening under high vibration conditions, ensuring a tight seal between the pressure-bearing seat and the cutterhead end cover. The cable leading from the outlet port of the cable outlet is then connected to the data acquisition control unit (data acquisition controller 8) via a hydraulic pipe for protection. Next, the socket of the cable outlet is inserted into the corresponding slot of the pressure-bearing seat and bolted securely, achieving a reliable connection between the pressure-bearing seat and the cable outlet. This establishes an electrical connection between the sensor and the data acquisition controller, enabling stable data transmission and pressure protection. Through long-term application and practice, this cutterhead electrical connection device has proven to provide excellent sealing protection and pressure-resistant waterproofing capabilities, effectively ensuring the acquisition of cutterhead sensor data during normal tunneling operations.

[0040] Although some preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0041] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. An electrical connection device for the cutterhead of a tunnel boring machine, characterized in that, Includes a pressure-bearing seat for fixing the blade barrel end cap to the end cap, and a cable outlet seat for correspondingly inserting into the pressure-bearing seat; The pressure-bearing seat includes a pressure-bearing seat body with a pressure-bearing plug hole in the center, a pressure-bearing electrical plug that is correspondingly sealed and fixed inside the pressure-bearing plug hole, and a pressure-bearing seal located on the end face of the pressure-bearing seat body for contacting the end cover of the knife barrel; the side of the pressure-bearing seat body away from the knife barrel is provided with a slot for inserting the outlet socket. The cable outlet includes a cable outlet body with a cable outlet hole, a socket that is correspondingly and sealed to the cable outlet hole and has a cable outlet plug hole in the center that matches the slot, and a plug cable that is fixed to the cable outlet plug hole; a radial sealing ring is embedded on the outer edge surface of the cable outlet body that is correspondingly embedded in the slot.

2. The shield machine cutterhead electrical connection device according to claim 1, characterized in that, The pressure-bearing seat body has a pressure-bearing seat step concentric with the pressure-bearing plug hole on the side corresponding to the knife barrel. The pressure-bearing seal is provided on the outer edge surface of the pressure-bearing seat step and the end face of the pressure-bearing seat body that contacts the end cap of the knife barrel. The pressure-bearing seal includes a pressure-bearing sealing groove opened on the corresponding surface and a pressure-bearing sealing ring embedded in the pressure-bearing sealing groove.

3. The shield machine cutterhead electrical connection device according to claim 1, characterized in that, The pressure-bearing electrical plug has a positioning shoulder on one side and a plug seal between the positioning shoulder and the corresponding end face of the pressure-bearing plug hole; an external thread is provided on the outer edge of the other side of the pressure-bearing electrical plug, and the pressure-bearing electrical plug is threaded to the plug nut at the external thread and sealed and fixed to the pressure-bearing plug hole.

4. The shield machine cutterhead electrical connection device according to claim 1, characterized in that, The slot has a non-circular cross-section along the axis perpendicular to the pressure-bearing plug hole, and the outer edge profile of the socket matches the inner edge profile of the slot.

5. The shield machine cutterhead electrical connection device according to claim 1, characterized in that, The end face of the cable outlet body that contacts the socket is provided with a cable outlet sealing groove, and a cable outlet sealing ring is provided in the cable outlet sealing groove.

6. The shield machine cutterhead electrical connection device according to claim 1, characterized in that, The socket is fixedly connected to the corresponding end face of the cable outlet body by socket bolts.

7. The shield machine cutterhead electrical connection device according to claim 1, characterized in that, The plug cable includes a mounting head with external threads for passing through the outlet plug hole, a limiting shoulder on the corresponding end side of the mounting head, and a fastening nut that is threadedly connected to the mounting head.

8. The shield machine cutterhead electrical connection device according to claim 1, characterized in that, The outlet seat and the pressure bearing seat are fastened together by corresponding bolts.

9. The shield machine cutterhead electrical connection device according to claim 1, characterized in that, The outer edge of the end face of the cable outlet seat that contacts the pressure bearing seat is provided with a skid groove, and / or the outer end face of the cable outlet seat is provided with a set screw hole parallel to the axial direction of the socket.

10. A method for electrical connection of a tunnel boring machine cutterhead, characterized in that, Based on the shield machine cutterhead electrical connection device as described in claim 1, after the sensor installed inside the cutterhead end cover is electrically connected to the pressure-bearing electrical plug, the pressure-bearing seat is fixed to the corresponding position of the cutterhead end cover by bolts, and the cable led out from the cable outlet hole of the cable outlet seat is electrically connected to the acquisition and control unit after being protected by a hydraulic pipe; when the sensor signal is acquired, the socket of the cable outlet seat is inserted into the slot of the pressure-bearing seat and tightened.

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