A replacement device for the cutterhead seal seat of a tunnel boring machine

Abstract

This utility model discloses a replacement device for the cutterhead seal seat of a tunnel boring machine (TBM), relating to the field of tunnel engineering machinery technology. Its structure includes a cylindrical section and an end cap located at one end of the cylindrical section. The end of the cylindrical section away from the end cap has an ear seat for connecting a cutterhead replacement fixture. The cylindrical section is hollow and cylindrical, and its outer diameter can mate with the mounting hole of the seal seat and slide axially along the mounting hole. The outer diameter of the end cap is the same as that of the cylindrical section. Multiple telescopic rods are evenly arranged circumferentially within the end cap, and these rods are radially arranged along the end cap and can extend or retract from the edge of the end cap. Applying this utility model allows for the replacement of the seal seat to be pushed to the front end of the cutterhead. After the device is fixed using the telescopic rods, the seal seat is isolated from the water and soil pressure at the front of the cutterhead, enabling the seal seat to be removed and replaced under normal pressure. This solves the technical problem that existing technologies cannot replace the cutterhead seal seat of a TBM under normal pressure.

Description

Technical Field

[0001] This utility model relates to the field of tunnel engineering machinery technology, specifically a replacement device for the cutterhead seal seat of a tunnel boring machine. Background Technology

[0002] The cutterhead, as the soil-cutting component of a slurry balance tunnel boring machine (TBM), is a crucial part of the TBM during tunnel construction, and its importance is self-evident. The TBM uses the cutterhead to cut away the excavated soil at the tunnel face, thus excavating the soil and propelling the TBM forward.

[0003] Depending on the geological conditions during tunnel boring machine excavation, the wear rate of cutterhead tools varies greatly. Ordinary cutterhead tools require personnel to replace them under pressure after wear, which is a harsh environment and has a high risk factor. Atmospheric pressure cutterhead solves this problem well. Through the sealing seat, tools can be replaced under atmospheric pressure, which greatly reduces the danger of tool replacement.

[0004] However, once the sealing seat leaks or is damaged, the function of replacing the cutting tool under normal pressure will no longer exist. If the cutting tool is worn, it must be replaced by personnel under pressure, which is a complex and dangerous operation that can easily lead to life-threatening situations. Currently, there is no good solution to the dilemma of replacing the sealing seat under normal pressure. Utility Model Content

[0005] The purpose of this invention is to provide a replacement device for the cutterhead seal seat of a tunnel boring machine, which can solve the technical problem that the existing technology cannot replace the cutterhead seal seat of a tunnel boring machine under normal pressure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] A replacement device for the cutterhead seal seat of a tunnel boring machine includes a cylindrical section and an end cap located at one end of the cylindrical section.

[0008] The cylindrical section is hollow and cylindrical. The outer diameter of the cylindrical section can fit with the mounting hole of the sealing seat and slide along the axial direction of the mounting hole.

[0009] The outer diameter of the end cap is the same as that of the cylindrical section. Multiple telescopic rods are evenly arranged in the end cap along the circumference. The telescopic rods are all arranged radially along the end cap and can extend or retract from the edge of the end cap.

[0010] Furthermore, the telescopic rod is a telescopic piston rod, and the telescopic rod is extended or retracted by hydraulic drive.

[0011] Furthermore, multiple telescopic cylinders are evenly arranged circumferentially on the end cover. The telescopic cylinders are all arranged radially along the end cover and correspond one-to-one with the telescopic rod. The telescopic rod is located in the telescopic cylinder and can slide along the axial direction of the telescopic cylinder to extend or retract.

[0012] Furthermore, a central hydraulic cylinder is provided in the middle of the end cap, and the ends of the telescopic hydraulic cylinders near the center of the end cap are all connected to the central hydraulic cylinder. Each telescopic hydraulic cylinder is provided with a first oil inlet for introducing hydraulic oil into the telescopic hydraulic cylinder to retract the telescopic rod into the end cap, and the central hydraulic cylinder is provided with a second oil inlet for introducing hydraulic oil into the central hydraulic cylinder to extend the telescopic rod out of the edge of the end cap.

[0013] Furthermore, a connecting pipe is provided between adjacent first oil inlets to connect multiple first oil inlets to each other. One of the connecting pipes is connected to the hydraulic system through a first oil inlet pipe, and the second oil inlet is connected to the hydraulic system through a second oil inlet pipe.

[0014] Furthermore, the cylindrical section and the end cap are detachably and fixedly connected. Preferably, the cylindrical section and the end cap are connected by bolts.

[0015] Furthermore, the end of the cylinder section away from the end cover is provided with an ear for connecting the tool changer.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects:

[0017] 1. This utility model achieves the purpose of isolating the sealing seat from the water and soil pressure at the front of the cutter head by pushing the sealing seat replacement device to the front of the cutter head and fixing the device with the telescopic rod. When the sealing seat has leakage or damage, this device can be used to remove and replace the sealing seat under normal pressure, which greatly improves the convenience and safety of sealing seat replacement and ensures the smooth progress of tunnel construction.

[0018] 2. The telescopic cylinders installed on the end caps of this device adopt the form of a shared central cylinder, which makes full use of the structural space, reduces the number of hydraulic lines, and simplifies the structure.

[0019] 3. The lug at the rear end of the cylindrical section of this device can be connected to the tool changing fixture, making full use of on-site resources. The lug can also play a limiting role during the pulling process of the device to ensure that the device is pushed into place.

[0020] 4. The cylindrical section and end cover in this device are connected by bolts. For sealing seats in different installation positions, they can be interchanged by replacing cylindrical sections of different lengths without changing the structure of the end cover, making full use of existing resources to meet the replacement of sealing seats for all atmospheric pressure tools. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of the sealing seat replacement device in this utility model.

[0022] Figure 2 This is a top view of the sealing seat replacement device in this utility model.

[0023] Figure 3This is a bottom view of the sealing seat replacement device in this utility model.

[0024] Figure 4 This is a schematic diagram showing the sealing seat replacement device fixed on the cutter head in this utility model.

[0025] Figure 5 This is a cross-sectional structural schematic diagram of the sealing seat replacement device in this utility model.

[0026] Figure 6 yes Figure 5 A schematic diagram of the cross-section along the AA direction.

[0027] Figure descriptions: 1. Cylindrical section; 11. Ear seat; 2. End cap; 21. Telescopic cylinder; 211. First oil inlet; 212. Connecting pipe; 213. First oil inlet pipe; 22. Central cylinder; 221. Second oil inlet; 222. Second oil inlet pipe; 3. Telescopic rod; 4. Sealing seat; 5. Cutter head. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the features and performance of a shield machine cutterhead sealing seat replacement device of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Please see the appendix Figures 1-6 A shield tunneling machine cutterhead seal replacement device includes a cylindrical section 1 and an end cap 2 located at one end of the cylindrical section 1. The end of the cylindrical section 1 away from the end cap 2 is provided with an ear seat 11 for connecting the cutterhead replacement fixture.

[0030] The cylindrical section 1 is hollow and cylindrical. The outer diameter of the cylindrical section 1 can fit with the mounting hole of the sealing seat 4 and slide along the axial direction of the mounting hole.

[0031] The outer diameter of the end cap 2 is the same as the outer diameter of the cylindrical section 1. Multiple telescopic rods 3 are evenly arranged in the end cap 2 along the circumference. The telescopic rods 3 are all arranged radially along the end cap 2 and can extend or retract from the edge of the end cap 2.

[0032] In the specific structural design, the telescopic rod 3 is a telescopic piston rod, and the telescopic rod 3 is extended or retracted by hydraulic drive.

[0033] Multiple telescopic cylinders 21 are evenly arranged along the circumference of the end cap 2. Preferably, in this embodiment, three telescopic rods 3 are provided in the end cap 2. The telescopic cylinders 21 are all arranged radially along the end cap 2 and correspond one-to-one with the telescopic rods 3. The telescopic rods 3 are located in the telescopic cylinders 21 and can slide along the axial direction of the telescopic cylinders 21 to extend or retract.

[0034] A central hydraulic cylinder 22 is provided in the middle of the end cap 2, and the end of the telescopic hydraulic cylinder 21 near the center of the end cap 2 is connected to the central hydraulic cylinder 22.

[0035] Each telescopic cylinder 21 is provided with a first oil inlet 211 for introducing hydraulic oil into the telescopic cylinder 21 to retract the telescopic rod 3 into the end cover 2, and the central cylinder 22 is provided with a second oil inlet 221 for introducing hydraulic oil into the central cylinder 22 to extend the telescopic rod 3 out of the edge of the end cover 2.

[0036] A connecting pipe 212 is provided between adjacent first oil inlets 211 to connect multiple first oil inlets 211 to each other. One of the connecting pipes 212 is connected to the hydraulic system through a first oil inlet pipe 213, and the second oil inlet 221 is connected to the hydraulic system through a second oil inlet pipe 222.

[0037] The cylindrical section 1 and the end cap 2 are detachably and fixedly connected. Preferably, the cylindrical section 1 and the end cap 2 are connected by bolts.

[0038] In practice, the sealing seat replacement device includes: a cylindrical section 1, an end cover 2, and a telescopic rod 3. The cylindrical section 1 and the end cover 2 are connected by bolts, and the telescopic rod 3 is installed in the end cover 2. The bottom of the cylindrical section 1 is also provided with an ear seat 11, which can dock with the tool changing fixture, and the sealing seat replacement device is moved by the tool changing fixture.

[0039] The end cap 2 is equipped with: a telescopic cylinder 21, a central cylinder 22, a first oil inlet 211, a second oil inlet 221, a connecting pipe 212, a first oil inlet pipe 213, and a second oil inlet pipe 222. The telescopic rod 3 is installed in the telescopic cylinder 21. The first oil inlet pipe 213 is connected to the first oil inlet 211 through the connecting pipe 212 to control the retraction of the telescopic rod 3. The second oil inlet pipe 222 is connected to the second oil inlet 221 to control the extension of the telescopic rod 3.

[0040] When replacing the sealing seat 4, close the gate of the sealing seat 4 and use a tool changer to insert the sealing seat replacement device into the mounting hole from the rear end of the sealing seat 4. During installation, the end of the sealing seat replacement device with the end cap 2 faces forward, and the telescopic rod 3 is in the retracted state.

[0041] Water pressure is filled into the area between the sealing seat replacement device and the gate of sealing seat 4 through the flushing port of sealing seat 4 until the pressure is balanced with the pressure in the mud and water chamber. The gate of sealing seat 4 is opened, and the tool changer is used to continue pushing the sealing seat replacement device towards the front of the cutter head 5 until the position of the telescopic rod 3 exceeds the front end face of the cutter head 5.

[0042] Operating the hydraulic system causes the telescopic rod 3 to extend beyond the edge of the end cover 2. Under the action of the water and soil pressure in front of the cutter head 5, it can firmly press the sealing seat replacement device onto the cutter head 5, thus isolating it from the water and soil pressure in front. Figure 4 As shown in the diagram. Temporarily disconnect the hydraulic oil lines at the rear of the tool changer and seal replacement device, namely the first oil injection pipe 213 and the second oil injection pipe 221.

[0043] At this point, remove the connecting bolts between the sealing seat 4 and the cutter head 5, remove the damaged sealing seat 4, and reinstall a qualified sealing seat 4, and then install the connecting bolts between the sealing seat 4 and the cutter head 5.

[0044] Reconnect the tool changer and hydraulic lines, and retract the telescopic rod 3 into the end cover 2. Use the tool changer to pull the seal seat replacement device to the rear end of the seal seat 4. Close the gate of the seal seat 4 and release the pressure in the area between the seal seat replacement device and the gate of the seal seat 4 through the flushing port of the seal seat 4. Use the tool changer to completely remove the seal seat replacement device from the newly replaced seal seat 4, completing the replacement of the seal seat 4.

[0045] It should be noted that the parts not described in detail in this solution are all prior art. The above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A shield machine cutter seal seat replacement device, characterized in that: It includes a cylindrical section (1) and an end cap (2) located at one end of the cylindrical section (1). The cylindrical section (1) is hollow and cylindrical. The outer diameter of the cylindrical section (1) can fit with the mounting hole of the sealing seat (4) and slide along the axial direction of the mounting hole. The outer diameter of the end cap (2) is the same as that of the cylindrical section (1). Multiple telescopic rods (3) are evenly arranged in the end cap (2) along the circumference. The telescopic rods (3) are all arranged radially along the end cap (2) and can extend or retract from the edge of the end cap (2).

2. The shield machine cutter seal seat replacement device according to claim 1, characterized in that: The telescopic rod (3) is a telescopic piston rod, and the telescopic rod (3) is extended or retracted by hydraulic drive.

3. The shield machine cutter seal seat replacement device of claim 2, wherein: Multiple telescopic cylinders (21) are evenly arranged along the circumference of the end cap (2). The telescopic cylinders (21) are all arranged radially along the end cap (2) and correspond one-to-one with the telescopic rod (3). The telescopic rod (3) is located in the telescopic cylinder (21) and can slide along the axial direction of the telescopic cylinder (21) to extend or retract.

4. The shield machine cutter seal seat replacement device according to claim 3, characterized in that: A central cylinder (22) is provided in the middle of the end cap (2). The end of the telescopic cylinder (21) near the center of the end cap (2) is connected to the central cylinder (22). The telescopic cylinder (21) is provided with a first oil inlet (211) for introducing hydraulic oil into the telescopic cylinder (21) to retract the telescopic rod (3) into the end cap (2). The central cylinder (22) is provided with a second oil inlet (221) for introducing hydraulic oil into the central cylinder (22) to extend the telescopic rod (3) out of the edge of the end cap (2).

5. The shield machine cutter seal seat replacement device according to claim 4, characterized in that: A connecting pipe (212) is provided between adjacent first oil inlets (211) for connecting multiple first oil inlets (211) to each other. One connecting pipe (212) is connected to the hydraulic system through the first oil inlet pipe (213), and the second oil inlet (221) is connected to the hydraulic system through the second oil inlet pipe (222).

6. The shield machine cutter seal seat replacement device of claim 1, wherein: The cylindrical section (1) and the end cap (2) are detachably and fixedly connected.

7. The shield machine cutter seal seat replacement device of claim 6, wherein: The cylindrical section (1) and the end cap (2) are connected by bolts.

8. The shield machine cutter seal seat replacement device of claim 1, wherein: The end of the cylinder section (1) away from the end cap (2) is provided with an ear seat (11) for connecting the tool changing fixture.

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