A rear-mounted hob system

Abstract

The invention discloses a rear-mounted roller cutter system, belonging to the technical field of tunnel excavation equipment application; the roller cutter comprises a roller cutter, a cutter box, and a radial connection assembly and an axial connection assembly for connecting the roller cutter and the cutter box; the roller cutter comprises a cutter shaft, a cutter hub, and end covers arranged on both sides of the cutter hub, and the end covers are connected to the cutter hub via the cutter shaft; the radial connection assembly comprises an abutment plate and a wedge block, the end cover comprises an inner hole and a wedge portion arranged on both sides of the inner hole, the inner hole is slidably connected to the cutter shaft, the abutment plate is arranged on both sides of the inside of the cutter box and is fixedly connected to the inner wall of the cutter box, the two wedge portions abut against the abutment plate respectively, and the two wedge blocks are arranged between the wedge portion and the inner wall of the cutter box; the axial connection assembly comprises an axial wedge block and an axial wedge groove, the axial wedge groove is arranged on the inner wall of the cutter box, the axial wedge groove is inserted into the axial wedge groove, and the two sides of the axial wedge block abut against the axial wedge groove and the end of the cutter shaft respectively. The invention can facilitate the installation of the TBM type center roller cutter.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel excavation equipment application, and in particular to a rear-mounted roller cutter system. Background Art

[0002] Disc cutters are excavation tools for breaking hard rocks. They are installed on the heads of large-scale trenchless construction equipment such as shield machines, TBMs, and pipe jacking. Their function is to cut the rocks on the face of the tunnel and peel them off from the face of the tunnel. They are widely used in the construction of subway tunnels, railway tunnels, water diversion tunnels, and urban underground pipe networks. Disc cutters are usually divided into single-edged, double-edged, and multi-edged. They are often installed on the cutterhead of the shield machine in a radial or spiral distribution. The shield machine advances forward under the pressure of the jack, and the cutterhead of the shield machine rotates at the same time. The cutter installed on the cutterhead of the shield machine rotates under friction and pressure while the cutterhead revolves with the cutterhead, so that the cutting edge of the cutter ring produces a rolling cutting effect on the rock surface.

[0003] The common center cutters on the market currently rely on 6 M33 bolts to jointly bear tensile stress. When the cutterhead is in the process of excavation, it is easy for individual bolts to loosen first, resulting in uneven force on the 6 bolts. When individual bolts are subjected to excessive force, the bolts will break. When individual bolts break, a chain reaction will occur, eventually causing other bolts to break or loosen, causing the cutter to fall off. In order to upgrade the existing shield cutterhead, the TBM-type center cutter is installed on the shield cutterhead instead of the existing center cutter. The end cover of the commonly used TBM-type center cutter on the market is directly installed on the cutter box, relying on the strong cutter box to bear the load on the cutter. The bolts on one side only play a limiting role and do not bear the actual load, so the bolts are not easy to break. However, the cutter with this installation method needs to be pre-drilled and tapped on the cutterhead to install the wedge.

[0004] In actual work, when a problem occurs with a shield cutterhead equipped with an ordinary center cutter and one wants to replace it with a relatively reliable TBM-type center cutter, it is difficult to drill and tap the cutterhead at construction sites such as tunnels, and it is impossible to replace the damaged ordinary center cutter with a TBM-type center cutter. Summary of the invention

[0005] In view of this, it is necessary to provide a rear-mounted cutter system to solve the problem that the existing TBM-type center cutter is difficult to install on the cutterhead in the tunnel.

[0006] The present invention provides a rear-mounted hob system, comprising: a hob, a cutter box, and a radial connection assembly and an axial connection assembly for connecting the hob and the cutter box;

[0007] The hob includes a cutter shaft, a cutter hub, and end covers arranged on both sides of the cutter hub, and the end covers are connected to the cutter hub via the cutter shaft;

[0008] The radial connection assembly includes an abutment plate and a wedge block, the end cover includes an inner hole and wedge-shaped portions arranged on both sides of the inner hole, the inner hole is slidably connected to the knife shaft, the abutment plates are arranged on both sides of the inside of the knife box and are fixedly connected to the inner wall of the knife box, the two wedge-shaped portions abut against the abutment plates respectively, the two wedge-shaped blocks are arranged between the wedge-shaped portions and the inner wall of the knife box, and the wedge blocks can press and connect the wedge-shaped portions and the knife box;

[0009] The axial connection assembly includes an axial wedge block and an axial wedge groove. The axial wedge groove is arranged on the inner wall of the tool box, and the axial wedge groove is inserted into the axial wedge groove. The two sides of the axial wedge block are respectively abutted against the axial wedge groove and the end of the tool shaft.

[0010] Furthermore, the wedge-shaped portion is inclined from the outer side of the end cover to the inner side of the end cover, and the wedge-shaped block is cooperatively connected with the wedge-shaped portion to limit the movement of the end cover.

[0011] Furthermore, the wedge block located at one side of the tool box is fixedly connected to the inner wall of the tool box, and a wedge groove for engaging the wedge portion is formed between the wedge block and the abutment plate.

[0012] Furthermore, the wedge block located at the other side of the tool box is detachably connected to the abutment plate, and a connection hole is provided in the abutment plate, and a bolt is screwed to the wedge block through the connection hole.

[0013] Furthermore, the axial wedge groove is embedded in the tool box, and the cross-section of the axial wedge groove is wedge-shaped.

[0014] Furthermore, an axial tension block is provided below the tool box, two sides of the axial tension block abut against the bottom of the tool box, a through hole is provided in the middle of the axial tension block, and a bolt passes through the through hole and is screwed to the axial wedge block.

[0015] Furthermore, the tool box is openly arranged at one end away from the axial wedge block, one end of the tool shaft abuts against the axial wedge block, and the other end of the tool shaft abuts against the cutter head of the shield machine through the tool box.

[0016] Furthermore, a detachable limit block is provided at the bottom of one of the end covers abutting against the axial wedge block, the limit block is protruding from the end surface of the end cover, and the limit block is located between the end cover and the inner wall of the tool box.

[0017] Furthermore, there are three end covers and two blade hubs, and the two blade hubs are arranged between two adjacent end covers, and the blade hubs are spaced apart from the end covers.

[0018] Furthermore, a knife ring is provided on the outside of the knife hub, and the knife ring is sleeved on the knife hub, and the knife ring is detachably connected to the knife hub.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) A rear-mounted hob system of the present invention abandons bolt connection and arranges an axial connection assembly on one side of the cutter shaft. The axial connection assembly includes an axial wedge block and an axial wedge groove. The axial wedge groove is arranged on the inner wall of the cutter box. The axial wedge groove is inserted into the axial wedge groove. The two sides of the axial wedge block are respectively abutted against the axial wedge groove and the end of the cutter shaft. The axial wedge block limits and fixes the axial direction of the hob. The fixation and release of the cutter shaft can be completed very conveniently by disassembling and assembling the axial wedge block, thereby simplifying the repair and replacement of the hob.

[0021] (2) In a rear-mounted hob system of the present invention, abutment plates are arranged on both sides of the inside of the knife box and are fixedly connected to the inner wall of the knife box, and the abutment plates extend deep into the inside of the knife box. Two wedge-shaped portions abut against the abutment plates respectively, and two wedge-shaped blocks are arranged between the wedge-shaped portions and the inner wall of the knife box. By reducing the height of the abutment plates and the wedge-shaped portions, the distance between the knife shaft and the bottom of the knife box can be reduced, so that the height of the hob is reduced, the rotation of the hob is more stable, the vibration is smaller, and the connection is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the present invention from a side view;

[0025] Figure 3 A schematic diagram of the structure of the present invention from a top view;

[0026] In the figure, the hob 100, the cutter shaft 110, the cutter hub 120, the end cover 130, the inner hole 131, the wedge portion 132, the cutter ring 140, the cutter box 200, the radial connection assembly 300, the abutment plate 310, the connecting hole 311, the wedge block 320, the wedge groove 330, the axial connection assembly 400, the axial wedge block 410, the axial wedge groove 420, the axial tensioning block 430, the through hole 431, the limit block 440, and the shield machine cutter head 500. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0028] See also Figures 1 to 3 In this embodiment, a rear-mounted roller cutter system includes: a roller cutter 100, a cutter box 200, and a radial connection assembly 300 and an axial connection assembly 400 for connecting the roller cutter 100 and the cutter box 200. The roller cutter 100 is installed in the cutter box 200, the cutter box 200 is welded on the shield machine cutter head 500, and the radial connection assembly 300 and the axial connection assembly 400 are used to position and install the roller cutter 100.

[0029] The hob 100 includes a cutter shaft 110, a cutter hub 120, and end covers 130 disposed on both sides of the cutter hub 120. The cutter shaft 110 is inserted into the cutter hub 120 and the end covers 130. The cutter hub 120 can rotate around the cutter shaft 110, and the end covers 130 and the cutter shaft 110 are relatively stationary. The radial connection assembly 300 includes an abutment plate 310 and a wedge block 320. The end cover 130 includes an inner hole 131 and wedge portions 132 disposed on both sides of the inner hole 131. The cutter shaft 110 can slide along the axial direction of the inner hole 131 for axial adjustment. The abutment plates 310 are disposed on both sides of the interior of the cutter box 200 and are fixedly connected to the inner wall of the cutter box 200. The abutment plates 310 penetrate into the interior of the cutter box 200. The two wedge-shaped portions 132 are respectively in contact with the contact plate 310, and the two wedge-shaped blocks 320 are arranged between the wedge-shaped portions 132 and the inner wall of the cutter box 200. By lowering the height of the contact plate 310 and the wedge-shaped portions 132, the distance between the cutter shaft 110 and the bottom of the cutter box 200 can be reduced, so that the height of the hob 100 is reduced, the rotation of the hob 100 is more stable, the vibration is smaller, and the wear is lower. The wedge-shaped blocks 320 can press and connect the wedge-shaped portions 132 and the cutter box 200 to limit and fix the radial direction of the hob 100. By disassembling and assembling the wedge-shaped blocks 320, the end cover 130 can be easily disassembled and assembled, thereby simplifying the repair and replacement of the hob 100.

[0030] The axial connection assembly 400 includes an axial wedge block 410 and an axial wedge groove 420. The axial wedge groove 420 is arranged on the inner wall of the tool box 200. The axial wedge groove 420 is inserted into the axial wedge groove 420. The two sides of the axial wedge block 410 are respectively abutted against the axial wedge groove 420 and the end of the tool shaft 110. The axial wedge block 410 limits and fixes the axial direction of the hob 100. The tool shaft 110 can be fixed and disassembled by disassembling and assembling the axial wedge block 410, thereby simplifying the disassembly and assembly of the hob 100.

[0031] See also Figure 1The wedge-shaped portion 132 is inclined from the outside of the end cover 130 to the inside of the end cover 130, and the wedge block 320 is connected with the wedge-shaped portion 132. After the wedge-shaped portion 132 is connected with the wedge block 320, the wedge-shaped portion 132 is subjected to both a squeezing force from the side and a resisting force from the top. Compared with the wedge-shaped portion 132 with a positive wedge shape, the limiting effect is better and the fixation of the end cover 130 is more stable.

[0032] Please continue reading Figure 1 The wedge block 320 located on one side of the knife box 200 is fixedly connected to the inner wall of the knife box 200. In the specific implementation process, the wedge block 320 located on one side of the knife box 200 is integrated with the inner wall of the knife box 200. A wedge groove 330 for engaging the wedge portion 132 is formed between the wedge block 320 and the abutment plate 310. The cross-sectional shape of the wedge groove 330 is consistent with the shape of the wedge portion 132. The wedge portion 132 can be inserted into the wedge groove 330 from the side of the end cover 130. The connection stability between the wedge portion 132 and the wedge block 320 is further strengthened, so that the end cover 130 can only move along the axial direction of the knife shaft 110, and the movement in other directions is restricted.

[0033] The wedge block 320 located on the other side of the knife box 200 is detachably connected to the abutment plate 310. In the specific implementation process, a connection hole 311 is provided in the abutment plate 310. The bolt passes through the abutment plate 310 and is screwed to the wedge block 320. The wedge block 320 fixes the wedge portion 132. The bolt connects the abutment plate 310 and the wedge block 320 together, further limits and fixes the wedge portion 132, and can also prevent the wedge block 320 from detaching.

[0034] See also Figure 2 The axial wedge groove 420 is embedded in the knife box 200, and the cross section of the axial wedge groove 420 is wedge-shaped. The axial wedge block 410 can be plugged with the axial wedge groove 420, and the inclined surface of the axial wedge block 410 abuts against the inclined surface of the axial wedge groove 420, and the parallel surface of the axial wedge block 410 abuts against the end surface of the knife shaft 110. This makes the abutment between the end surface of the knife shaft 110 and the axial wedge block 410 more tightly.

[0035] Please refer to the figure Figures 1 to 3 An axial tension block 430 is provided below the knife box 200, and both sides of the axial tension block 430 abut against the bottom of the knife box 200. The position of the axial tension block 430 can be adjusted along the axial direction of the knife shaft 110. A through hole 431 is provided in the middle of the axial tension block 430, and a bolt is screwed to the axial wedge block 410 through the through hole 431. The axial tension block 430 is connected to the axial wedge block 410 through the bolt. The bolt pulls the axial tension block 430 and the axial wedge block 410 toward the middle of the knife box 200, which can prevent the axial wedge block 410 from detaching and ensure the stability of the connection.

[0036] See also Figure 2 and Figure 3 The end of the cutter box 200 away from the axial wedge block 410 is open, one end of the cutter shaft 110 abuts against the axial wedge block 410, and the other end of the cutter shaft 110 abuts against the shield machine cutter head 500 through the cutter box 200. The cutter shaft 110 can drive the overall axial displacement of the roller cutter 100. With the help of the cutter box mounting hole located on the shield machine cutter head 500, one end of the cutter shaft 110 can abut against the inner wall of the cutter box mounting hole, which can reduce the manufacturing cost of the cutter box 200, simplify the installation process of the roller cutter 100, and save time and cost.

[0037] See also Figure 1 and Figure 2 A detachable stopper 440 is provided at the bottom of one end cover 130 abutting against the axial wedge block 410. The stopper 440 is specifically "L"-shaped. One side of the stopper 440 is connected to the bottom of the end cover 130 by bolts, and the other side of the stopper 440 abuts against the end of the end cover 130 and protrudes from the end surface of the end cover 130. The protruding stopper 440 is located between the end cover 130 and the inner wall of the tool box 200. The stopper 440 can limit the minimum distance between the end cover 130 and the inner wall of the tool box 200, and reserve the installation space of the axial wedge block 410. At the same time, the stopper 440 can prevent the end cover 130 from detaching from the abutment plate 310 during the installation process, so that the hob 100 slides off the tool box 200.

[0038] Please continue reading Figure 1 and Figure 2 , there are three end covers 130, and two cutter hubs 120, and the two cutter hubs 120 are arranged between the two adjacent end covers 130, and the cutter hubs 120 and the end covers 130 are arranged at intervals. In the specific implementation process, the hob 100 can be a single hub, a double hub, or a multi-hub, and the cutter ring 140 is installed on the cutter hub 120. The number of end covers 130 is one more than the cutter hub 120, so that both sides of the cutter hub 120 are provided with end covers 130, the end covers 130 are stationary relative to the cutter shaft 110, and the cutter hub 120 rotates relative to the cutter shaft 110. The number of cutter hubs 120 and the end portions is not a limitation of the present application. The cutter ring 140 is sleeved on the outside of the cutter hub 120. A limiting boss and a shifting groove are provided on the cutter hub 120. The cutter hob 100 is located between the limiting boss and the shifting groove. The retaining ring is clamped in the shifting groove, and the retaining ring is welded to the shifting groove to limit the cutter hob 100 and prevent the cutter hob 100 from falling out during operation.

[0039] The installation steps between the hob and the cutter box are as follows:

[0040] 1. Insert the hob 100 into the tool box 200 from the back side of the tool box 200 , align the wedge-shaped portion 132 with the wedge-shaped groove 330 , and translate it laterally so that the wedge-shaped portion 132 abuts against the end of the abutment plate 310 .

[0041] 2. Install the limit block 440 on the end cover 130 to prevent the hob 100 from falling off during installation. Insert the three wedge blocks 320 between the inner wall of the cutter box 200 and the wedge portion 132, and do not install the bolts yet, so that the cutter shaft 110 and the end cover 130 can move axially.

[0042] 3. Install the axial wedge block 410 and the axial tension block 430, and connect the axial tension block 430 and the axial wedge block 410 with bolts.

[0043] 4. Connect the wedge block 320 and the abutment plate 310 with bolts, and tighten the bolts.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered by the present invention.

Claims

1. A rear-mounted hob system, characterized in that: include: A hob, a cutter box, and a radial connection assembly and an axial connection assembly for connecting the hob and the cutter box; The hob includes a cutter shaft, a cutter hub, and end covers arranged on both sides of the cutter hub, and the end covers are connected to the cutter hub via the cutter shaft; The radial connection assembly includes an abutment plate and a wedge block, the end cover includes an inner hole and wedge-shaped portions arranged on both sides of the inner hole, the inner hole is slidably connected to the knife shaft, the abutment plates are arranged on both sides of the inside of the knife box and are fixedly connected to the inner wall of the knife box, the two wedge-shaped portions abut against the abutment plates respectively, the two wedge-shaped blocks are arranged between the wedge-shaped portions and the inner wall of the knife box, and the wedge blocks can press and connect the wedge-shaped portions and the knife box; The axial connection assembly includes an axial wedge block and an axial wedge groove, wherein the axial wedge groove is provided on the inner wall of the tool box, the axial wedge block is inserted into the axial wedge groove, and two sides of the axial wedge block are respectively in contact with the axial wedge groove and the end of the tool shaft; A detachable limit block is provided at the bottom of one of the end covers abutting against the axial wedge block, and the limit block is specifically "L"-shaped, one side of the limit block is connected to the bottom of the end cover by a bolt, and the other side of the limit block abuts against the end of the end cover and protrudes from the end surface of the end cover, and the protruding limit block is located between the end cover and the inner wall of the tool box.

2. A rear-mounted hob system according to claim 1, characterized in that: The wedge-shaped portion is inclined from the outer side of the end cover to the inner side of the end cover, and the wedge-shaped block is cooperatively connected with the wedge-shaped portion to limit the movement of the end cover.

3. A rear-mounted hob system according to claim 2, characterized in that: The wedge block located at one side of the knife box is fixedly connected to the inner wall of the knife box, and a wedge groove for engaging the wedge portion is formed between the wedge block and the abutment plate.

4. A rear-mounted hob system according to claim 3, characterized in that: The wedge block located at the other side of the knife box is detachably connected to the abutment plate, and a connection hole is provided in the abutment plate, through which a bolt is screwed to the wedge block.

5. A rear-mounted hob system according to claim 1, characterized in that: The axial wedge groove is embedded in the tool box, and the cross section of the axial wedge groove is wedge-shaped.

6. A rear-mounted hob system according to claim 1, characterized in that: An axial tension block is provided below the tool box, and two sides of the axial tension block abut against the bottom of the tool box. A through hole is provided in the middle of the axial tension block, and a bolt passes through the through hole and is screwed to the axial wedge block.

7. A rear-mounted hob system according to claim 1, characterized in that: The tool box is openly arranged at one end away from the axial wedge block, one end of the tool shaft abuts against the axial wedge block, and the other end of the tool shaft abuts against the cutter head of the shield machine through the tool box.

8. The rear-mounted hob system according to claim 1, characterized in that: There are two blade hubs, and the two blade hubs are arranged between two adjacent end covers, and the blade hub and the end cover are arranged at intervals.

9. A rear-mounted hob system according to claim 1, characterized in that: A knife ring is arranged outside the knife hub, and the knife ring is sleeved on the knife hub. The knife ring is detachably connected to the knife hub.

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