A subway tunnel shield machine cutter

Abstract

The invention discloses a subway tunnel shield machine cutter, comprising a cutter ring, a bearing, a cutter body and a cutter shaft; the cutter ring is connected to the outside of the cutter body and the cutter body is rotatably connected to the cutter shaft through a bearing; the cutter ring comprises a module group, a circumferential locking member and a radial locking member; the module group is provided with a plurality of modules, all of which are sequentially connected along the circumference, so that all of the module groups are sequentially connected to form a ring; each module group comprises a plurality of fan-shaped modules, and the two end faces of each fan-shaped module are respectively provided with a positioning groove and a positioning protrusion, and the positioning protrusions of two adjacent fan-shaped modules are inserted into the corresponding positioning grooves, so that all of the fan-shaped modules of each module group are sequentially docked; the adjacent ends of each two adjacent module groups share a fan-shaped module. The invention reduces the degree of damage to the cutter ring, increases the service life of the cutter ring, and reduces construction costs.

Description

Technical Field

[0001] The invention relates to the technical field of shield machines, and in particular to a cutter for a shield machine in a subway tunnel. Background Art

[0002] The cutterhead of a shield machine is a cutting disc with multiple feed slots, located at the front of the shield machine, and is used to cut soil. A variety of cutters are installed on the cutterhead, including center cutters, roller cutters, scrapers, and super-digging cutters. The roller cutters rotate during the rotation of the cutterhead to achieve the effect of rolling and squeezing rock. It is mainly used for medium-weathered, slightly weathered, and strata with a strength of more than 30 MPa. It is one of the main cutters for breaking hard rocks.

[0003] The structure of the roller cutter includes a cutter ring, a cutter body, a cutter shaft, an end cover, a retaining ring, a bearing and a sealing ring. The cutter ring is located at the outermost layer and is the core part of the roller cutter. It has high wear resistance and high strength. The existing cutter ring is a whole. In order to improve the rock breaking efficiency, the outer surface of the cutter ring is strengthened, such as adding a wear-resistant layer, inlaying high-strength materials, etc. Although the existing roller cutters are constantly being improved, there is still a problem of chipping in the actual excavation process, that is, the outer surface of the cutter ring is damaged due to excessive pressure, temperature, etc., which is abnormal wear.

[0004] The knife ring is expensive, especially the knife ring that has been strengthened. The above knife ring adopts an integral design, except for the strengthening treatment, and the entire knife ring is formed in one piece. If the above-mentioned abnormal wear such as chipping occurs, the entire knife ring needs to be replaced, and the average life of the knife ring will also be shortened. For knife rings with chipping but little wear, the overall replacement will greatly increase the construction cost. In addition, this problem will increase the work of changing knives, seriously affecting the construction progress. Summary of the invention

[0005] Aiming at the defects in the prior art, the damage degree of the cutter ring is reduced, the service life of the cutter ring is increased, and the construction cost is reduced. The present invention provides a subway tunnel shield machine cutter, including a cutter ring, a bearing, a cutter body and a cutter shaft; the cutter ring is connected to the outside of the cutter body and the cutter body is rotatably connected to the cutter shaft through a bearing;

[0006] The knife ring includes a module group, a circumferential locking piece and a radial locking piece; the module group is provided in plurality, and all the module groups are connected in sequence along the circumferential direction, so that all the module groups are connected in sequence to form a ring; each module group includes a plurality of fan-shaped modules, and the two end faces of each fan-shaped module are respectively provided with a positioning recess and a positioning protrusion, and the positioning protrusions of two adjacent fan-shaped modules are inserted into the corresponding positioning recess, so that all the fan-shaped modules of each module group are connected in sequence; the adjacent ends of each two adjacent module groups share a fan-shaped module;

[0007] The inner surfaces of all the fan-shaped modules of each module group are provided with grooves extending along the circumferential direction, and the cross-sectional shape of the grooves is an arc; the shape of the circumferential locking member is adapted to the grooves, and the cross-sectional shape of the circumferential locking member is circular; the outer surface of the circumferential locking member is fixedly connected to a plurality of annular chucks, and all the annular chucks are evenly distributed along the axial direction of the circumferential locking member; all the grooves are provided with gaps adapted to the annular chucks of the corresponding circumferential locking members, and all the annular chucks are inserted one by one along the corresponding gaps, thereby allowing the circumferential locking member to be inserted into the corresponding grooves to lock all the fan-shaped modules of the module group; a first threaded hole extending radially along the knife ring is provided between adjacent two fan-shaped modules of each adjacent two module groups, and the opening of the first threaded hole passes through the inner surface of the knife ring; the radial locking member is screwed into the first threaded hole, thereby locking the two adjacent fan-shaped modules.

[0008] The beneficial effects of this equipment are reflected in the following aspects: the entire cutter ring is made of multiple fan-shaped modules. If one or more fan-shaped modules are broken due to rock strength that is too high or the operating temperature is too high, the undamaged fan-shaped modules can continue to squeeze and crush the rock, and the gaps caused by the broken edges will not greatly increase the wear of the cutter ring or even break directly. The undamaged fan-shaped modules are the same height as the normal cutter ring, and can continue to work until the specified tool maintenance time point, and then perform the tool change operation, thereby avoiding the problem of delaying the construction progress due to the increase in the number of tool changes caused by broken edges. In addition, the damaged fan-shaped modules can be disassembled and replaced with new fan-shaped modules to repair the cutter ring and continue to use it. Compared with the integrated cutter ring, the service life of the cutter ring is greatly increased, thereby extending the average life of the roller cutter and reducing the construction cost.

[0009] Preferably, the grooves of the fan-shaped modules at both ends of each module group extend to the middle of the corresponding fan-shaped modules, and the grooves of the fan-shaped modules between the two ends of each module group run through the two ends of the corresponding fan-shaped modules. Each module group corresponds to a circumferential locking member, and the length of a circumferential locking member is consistent with the total length of all grooves in a module group. The two ends of the circumferential locking member are just located in the grooves of the fan-shaped modules at both ends, so that the circumferential locking member is just stuck inside the module group to achieve precise installation. If the fan-shaped modules of the module group are not installed in place, the circumferential locking member cannot be stuck inside the module group.

[0010] Preferably, two first threaded holes are provided between two adjacent sector-shaped modules of each two adjacent module groups, and the two first threaded holes are located on both sides of the corresponding groove; each first threaded hole is provided with the radial locking member. The two first threaded holes cooperate with the two radial locking members to further increase the maximum radial shear stress and axial shear stress that the sector-shaped module can withstand.

[0011] Preferably, the cross-section of the positioning protrusion is in the shape of a "human" shape, and the positioning protrusion is parallel to the cross-section edge of the corresponding fan-shaped module. The "human"-shaped positioning protrusion can make any point of the edges of the two fan-shaped modules completely overlap, greatly reducing the possibility of fine sediment entering the positioning sink. In addition, the "human"-shaped positioning protrusion surrounds the groove and the first threaded hole, preventing fine sediment from entering the groove and the first threaded hole.

[0012] Preferably, a sealing gasket is provided at the end of each positioning protrusion. After two adjacent sector modules are butted together, the sealing gasket is pressed tightly, and the sealing gasket blocks muddy water from entering the inner side of the positioning protrusion, that is, muddy water is prevented from entering the groove and the first threaded hole from the interface where the two sector modules are butted together.

[0013] Preferably, the inner surface of each fan-shaped module is provided with a second threaded hole intersecting with the groove of the fan-shaped module, and the circumferential locking member in the groove is provided with a through hole corresponding to the second threaded hole. A top screw is screwed into the second threaded hole to prevent the circumferential locking member from falling off the groove.

[0014] Preferably, both sides and the top of the outer surface of each fan-shaped module are laser-clad with spherical tungsten carbide layers. Each fan-shaped module is strengthened to improve rock breaking efficiency.

[0015] Preferably, there are four module groups.

[0016] Preferably, each module group is provided with four sector modules.

[0017] Preferably, the circumferential locking member and the radial locking member are both made of carbon alloy steel. The carbon alloy steel material may be SCM435, 35CrMo, SAE4137, SAE4135 or DIN34CrMo4. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0019] Figure 1 It is a structural schematic diagram of this embodiment;

[0020] Figure 2 for Figure 1 Cross-section of the middle knife ring;

[0021] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0022] Figure 4 Schematic diagram of the connection structure of two adjacent fan-shaped modules in this embodiment;

[0023] Figure 5 The structure diagram of the circumferential locking member in this embodiment Figure 1 ;

[0024] Figure 6 The structure diagram of the circumferential locking member in this embodiment Figure 2 .

[0025] In the attached drawings, there are a knife ring 1, a bearing 2, a knife body 3, a knife shaft 4, a module group 5, a circumferential locking piece 6, a radial locking piece 7, a positioning groove 8, a positioning protrusion 9, a groove 10, an annular chuck 11, a first threaded hole 12, a second threaded hole 13, a gap 14, a fan-shaped module 15, and a sealing gasket 16. DETAILED DESCRIPTION

[0026] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0027] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0028] like Figure 1 , 2 As shown in , 4, this embodiment provides a subway tunnel shield machine cutter, including a cutter ring 1, a bearing 2, a cutter body 3 and a cutter shaft 4; the cutter ring 1 is connected to the outside of the cutter body 3 and the cutter body 3 is rotatably connected to the cutter shaft 4 through the bearing 2. The cutter ring 1 includes a module group 5, a circumferential locking member 6 and a radial locking member 7; there are four module groups 5, all of which are connected in sequence along the circumferential direction, so that all of the module groups 5 are connected in sequence to form a ring; each module group 5 includes four fan-shaped modules 15, and the two end faces of each fan-shaped module 15 are respectively provided with a positioning groove 8 and a positioning protrusion 9, and the positioning protrusions 9 of two adjacent fan-shaped modules 15 are inserted into the corresponding positioning groove 8, so that all of the fan-shaped modules 15 of each module group 5 are connected in sequence. Each adjacent end of two adjacent module groups 5 shares a sector module 15, that is, the entire knife ring 1 is formed by splicing twelve sector modules 15. In order to ensure that all sector modules 15 are firmly connected, this embodiment is connected by a double locking structure, that is, a circumferential locking member 6 connection and a radial locking member 7 connection. The specific connection structure of the circumferential locking member 6 is as follows:

[0029] like Figure 2 , 3As shown in , 5 and 6, the inner surfaces of all the fan-shaped modules 15 of each module group 5 are provided with grooves 10 extending along the circumferential direction, and the cross-sectional shape of the grooves 10 is an arc. Furthermore, the grooves 10 of the fan-shaped modules 15 at both ends of each module group 5 extend to the middle of the corresponding fan-shaped modules 15, and the grooves 10 of the fan-shaped modules 15 between the two ends of each module group 5 run through the two ends of the corresponding fan-shaped modules 15. The shape of the circumferential locking member 6 is adapted to the grooves 10, and the cross-sectional shape of the circumferential locking member 6 is circular. That is, the shape of the circumferential locking member 6 is a bent cylinder. In addition, the outer surface of the circumferential locking member 6 is fixedly connected to a plurality of annular chucks 11, and all the annular chucks 11 are evenly distributed along the axial direction of the circumferential locking member 6. All grooves 10 are provided with gaps 14 adapted to the annular chucks 11 of the corresponding circumferential locking members 6, and all the annular chucks 11 are inserted one by one along the corresponding gaps 14, so that the circumferential locking members 6 are inserted into the corresponding grooves 10 to lock all the fan-shaped modules 15 of the module group 5. The number and specific position of each annular chuck 11 correspond to a gap 14, and all the annular chucks 11 correspond to all the gaps 14 one by one. The annular chucks 11 cannot be inserted into the misplaced gaps 14, so that the installation relationship is unique and the installation accuracy is guaranteed. Each gap 14 should avoid the interface of two adjacent fan-shaped modules 15. Further, the inner surface of each of the fan-shaped modules 15 is provided with a second threaded hole 13 intersecting with the groove 10 of the fan-shaped module 15, and the circumferential locking member 6 in the groove 10 is provided with a through hole corresponding to the second threaded hole 13. The second threaded hole 13 is screwed into a top screw to prevent the circumferential locking member 6 from falling off from the groove 10. The annular chuck 11 limits the displacement of the circumferential locking member 6, and also disperses and absorbs the stress along the groove 10 direction of the circumferential locking member 6. Each module group 5 corresponds to a circumferential locking member 6, and the length of a circumferential locking member 6 is consistent with the total length of all grooves 10 in a module group 5. The two ends of the circumferential locking member 6 are just located in the grooves 10 of the fan-shaped modules 15 at both ends, so that the circumferential locking member 6 is just stuck in the inside of the module group 5, and accurate installation is achieved. If the fan-shaped module 15 of the module group 5 is not installed in place, the circumferential locking member 6 cannot be stuck in the inside of the module group 5. The circumferential locking member 6 can effectively prevent the fan-shaped module 15 from separating, radially dislocating, and radially dislocating along the circumferential direction, so that all the module groups 5 are tightly spliced ​​together. And between the adjacent two fan-shaped modules 15 of each adjacent two module groups 5, two adjacent circumferential locking members 6 are used to fix them.

[0030] The specific connection structure of the radial locking member 7 is as follows:

[0031] like Figure 1 , 2As shown, a first threaded hole 12 extending radially along the cutter ring 1 is provided between two adjacent sector modules 15 of each two adjacent module groups 5, and the opening of the first threaded hole 12 passes through the inner surface of the cutter ring 1. The radial locking member 7 is screwed into the first threaded hole 12, thereby locking the two adjacent sector modules 15. The radial locking member 7 can be made of hard alloy, and the entire radial locking member 7 is used to withstand radial shear stress, axial shear stress and comprehensive stress, which greatly improves the pressure bearing capacity of the cutter ring 1 during the rock breaking process. The pressure bearing capacity is not lower than that of the existing integrated cutter ring 1, meeting the rock crushing requirements. Further, two first threaded holes 12 are provided between two adjacent sector modules 15 of each two adjacent module groups 5, and the two first threaded holes 12 are located on both sides of the corresponding groove 10; each first threaded hole 12 is provided with the radial locking member 7. The two first threaded holes 12 cooperate with the two radial locking members 7, further increasing the maximum radial shear stress, axial shear stress, etc. that the sector module 15 can withstand.

[0032] Due to the use of a splicing connection structure, this embodiment also uses the following positioning method to increase the accuracy of installation:

[0033] like Figure 1 , 4 As shown, in the present embodiment, the cross-sectional shape of each positioning protrusion 9 is a "human" shape, and the positioning protrusion 9 is parallel to the cross-sectional edge of the corresponding fan-shaped module 15. The "human" shaped positioning protrusion 9 is docked with the corresponding positioning sink 8, and can be accurately positioned in all directions, allowing extremely small assembly errors. On the other hand, the "human" shaped positioning protrusion 9 can make any point of the edge of the two fan-shaped modules 15 completely overlap, greatly reducing the possibility of fine mud and sand entering the positioning sink 8. Furthermore, a sealing gasket 16 is provided at the end of each positioning protrusion 9. After the two adjacent fan-shaped modules 15 are docked, the sealing gasket 16 is pressed, and the sealing gasket 16 blocks mud and water from entering the inner side of the positioning protrusion 9, that is, it is prevented from entering the groove 10 and the first threaded hole 12 from the interface where the two fan-shaped modules 15 are docked.

[0034] In this embodiment, both sides and the top of the outer surface of each of the fan-shaped modules 15 are laser-clad with spherical tungsten carbide layers. Each fan-shaped module 15 has been strengthened to improve the rock breaking efficiency. The circumferential locking member 6 and the radial locking member 7 are parts that bear comprehensive stress, and their materials are carbon alloy steel to ensure the strength requirements of the circumferential locking member 6 and the radial locking member 7 themselves. Carbon alloy steel materials can be selected from SCM435, 35CrMo, SAE4137, SAE4135 or DIN34CrMo4. In addition, in this embodiment, all the grooves 10, positioning grooves 8, and first threaded holes 12 are close to the inner surface of the knife ring 1 to avoid affecting the strength of the outer surface of the knife ring 1.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A subway tunnel boring machine cutter; comprising a cutter ring, a bearing, a cutter body, and a cutter shaft; the cutter ring is connected to the outside of the cutter body, and the cutter body is rotatably connected to the cutter shaft via a bearing; Its characteristics are: The knife ring includes a module group, a circumferential locking member and a radial locking member; there are multiple module groups, all of which are connected in sequence along the circumference, so that all the module groups are connected in sequence to form a ring; Each module group includes multiple fan-shaped modules, and the two end faces of each fan-shaped module are respectively provided with positioning grooves and positioning protrusions. The positioning protrusions of two adjacent fan-shaped modules are inserted into the corresponding positioning grooves, so that all the fan-shaped modules of each module group are connected in sequence; the adjacent ends of each two adjacent module groups share a fan-shaped module; The inner surfaces of all the sector-shaped modules of each module group are provided with grooves extending along the circumference, and the cross-sectional shape of the grooves is a circular arc; the shape of the circumferential locking member is adapted to the grooves, and the cross-sectional shape of the circumferential locking member is circular; the outer surface of the circumferential locking member is fixedly connected to a plurality of annular chucks, and all the annular chucks are evenly distributed along the axial direction of the circumferential locking member; all the grooves are provided with gaps adapted to the annular chucks of the corresponding circumferential locking member, and all the annular chucks are snapped into place one by one along the corresponding gaps, thereby snapping the circumferential locking member into the corresponding groove to lock all the sector-shaped modules of the module group; A first threaded hole extending radially along the cutter ring is provided between two adjacent fan-shaped modules of each adjacent module group, and the opening of the first threaded hole passes through the inner surface of the cutter ring; the radial locking member is screwed into the first threaded hole to lock the two adjacent fan-shaped modules.

2. A subway tunnel shield machine cutter according to claim 1, characterized in that: The grooves of the fan-shaped modules at both ends of each module group extend to the middle of the corresponding fan-shaped modules, and the grooves of the fan-shaped modules between the two ends of each module group pass through both ends of the corresponding fan-shaped modules.

3. The subway tunnel shield machine cutter according to claim 1, characterized in that: Two first threaded holes are provided between two adjacent sector-shaped modules of each two adjacent module groups, and the two first threaded holes are located on both sides of the corresponding groove; each first threaded hole is provided with the radial locking member.

4. The subway tunnel shield machine cutter according to claim 1, characterized in that: The cross-sectional shape of the positioning protrusion is a "human" shape, and the positioning protrusion is parallel to the cross-sectional edge of the corresponding sector-shaped module.

5. The subway tunnel shield machine cutter according to claim 4, characterized in that: A sealing gasket is provided at the end of each positioning protrusion.

6. The subway tunnel shield machine cutter according to claim 1, characterized in that: The inner surface of each of the fan-shaped modules is provided with a second threaded hole intersecting with the groove of the fan-shaped module, and the circumferential locking piece in the groove is provided with a through hole corresponding to the second threaded hole.

7. The subway tunnel shield machine cutter according to claim 1, characterized in that: Both sides and the top of the outer surface of each fan-shaped module are laser-clad with spherical tungsten carbide layers.

8. The subway tunnel shield machine cutter according to claim 1, characterized in that: There are four module groups.

9. The subway tunnel shield machine cutter according to claim 1, characterized in that: Each module group is provided with four sector modules.

10. The subway tunnel shield machine cutter according to claim 1, characterized in that: The circumferential locking piece and the radial locking piece are both made of carbon alloy steel.

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