Splitting knife

Abstract

The utility model relates to the technical field of tearing knife discloses split tearing knife, including the knife holder and the knife head, the top of knife head is provided with the recess, and the recess forms the support body between, and the cutter tooth is installed in the recess through the mode of casting, and the cutter tooth protrudes the support body setting, the upper side fixed mounting of knife holder has the lower connecting seat, the lower side fixed mounting of knife head has the upper connecting seat, and the lower connecting seat, the upper connecting seat are connected through the sheath subassembly. The utility model discloses the setting through the sheath subassembly, has facilitated the docking installation and split of lower connecting seat and upper connecting seat, and the knife head is convenient for replacing, and the sheath subassembly can protect the junction of knife holder, knife head, avoids the loss of knife holder, and also can replace after the wear of sheath subassembly, and the overall wear resistance is better, and maintenance is also more convenient.

Description

Technical Field

[0001] This utility model relates to the field of ripping knife technology, specifically a split-type ripping knife. Background Technology

[0002] As a key component for rock breaking in tunnel boring machines (TBMs), the tearing cutterhead's structural design must take into account rock breaking efficiency, wear resistance, ease of installation, and service life. The core structure includes the cutterhead holder, cutter head, alloy teeth, and mounting structure.

[0003] In existing technology, the core structure of the tunnel boring machine's tearing cutter mainly includes the cutter holder, cutter head, alloy teeth, and mounting structure. The cutter holder is usually fixedly installed on the cutterhead of the tunnel boring machine, providing a stable support foundation for the entire tearing cutter. The cutter head is equipped with alloy teeth, which are the key parts that directly contact and crush materials such as rocks. The alloy teeth are generally made of high-hardness and high-wear-resistant alloy materials to ensure that they can effectively crush rocks under harsh working conditions. The cutter head is usually directly connected to the cutter holder by bolt assembly. This connection method can, to a certain extent, ensure the connection strength between the cutter head and the cutter holder.

[0004] However, in actual ripping knife operations, each part will be subjected to different degrees of wear, and the degree of wear varies significantly from place to place. For example, the alloy teeth at the top of the cutter head wear faster due to direct collision and friction with the rock; while the cutter holder mainly bears the force transmitted from the cutter head, so it wears relatively slowly. When the alloy teeth wear to a certain extent, the rock-breaking efficiency of the ripping knife will drop significantly, at which point the ripping knife needs to be replaced.

[0005] However, the existing tearing knife structure has some drawbacks. The wear resistance at the connection between the cutter head and the cutter holder is poor, and it is easily worn out. In addition, since the cutter holder and the cutter disc are fixedly installed, it is extremely difficult to replace the cutter holder. This will result in very high maintenance costs and long downtime, affecting the smooth progress of the project.

[0006] Therefore, in order to solve the above problems, a split-type ripper is proposed. Utility Model Content

[0007] The purpose of this invention is to provide a split-type tearing knife. By setting up a sheath assembly and other structures, the knife head can be easily disassembled, while the wear resistance of the connection point can be improved, thereby solving the problems mentioned in the background art.

[0008] This utility model provides a technical solution: The split-type ripping knife includes a blade holder and a blade head. The top of the blade head has a groove, and a support body is formed between the grooves. Blade teeth are installed in the grooves by casting, and the blade teeth protrude from the support body. A lower connecting seat is fixedly installed on the upper side of the blade holder, and an upper connecting seat is fixedly installed on the lower side of the blade head. The lower connecting seat and the upper connecting seat are connected by a protective sleeve assembly.

[0009] Specifically, the sheath assembly includes a housing and a first countersunk hole. The upper connecting seat is inserted into the top of the mating groove, and the lower connecting seat is inserted into the bottom of the mating groove. Both the upper and lower connecting seats are provided with a first through hole. The front and rear sides of the housing are provided with first countersunk holes. Bolt sets are installed in the aligned first countersunk holes and first through holes.

[0010] Furthermore, four first through holes are evenly provided on the upper and lower connecting seats along the horizontal direction, and four first countersunk holes are provided on each side of the sleeve, with the four first countersunk holes on the same side distributed at the four corners of the virtual parallelogram.

[0011] Furthermore, the top of the housing is provided with a mating groove, and the shape of the upper connecting seat is adapted to the mating groove.

[0012] This utility model provides another technical solution: The difference from the above technical solution lies in the connection method of the sheath assembly connecting the lower connecting seat and the upper connecting seat. That is, the front side of the lower connecting seat is provided with a seat groove, and the upper connecting seat is inserted into the seat groove. Both the upper connecting seat and the lower connecting seat are provided with four second through holes, and the four second through holes on each side are distributed in a rectangular array.

[0013] Specifically, the sheath assembly includes a main sheath plate and side sheath plates. Both the main sheath plate and the side sheath plates have a pair of second countersunk holes. The rear side of the lower connecting seat and the front side of the upper connecting seat each have a main sheath plate groove. Two main sheath plates are installed in each main sheath plate groove. A bolt group is installed between the second through hole and the second countersunk hole on the main sheath plate. Side sheath plate grooves are opened on both the left and right sides of the lower connecting seat. Side sheath plates are installed in the side sheath plate grooves. Screw holes are opened in the side sheath plate grooves. Screws are installed between the screw holes and the second countersunk holes on the side sheath plates.

[0014] Furthermore, there are two side guards on each side, arranged in a V-shape.

[0015] Compared with the prior art, the beneficial effects of this utility model are: When the cutter head needs to be replaced due to wear and damage caused by prolonged use or strong impact, the structure of the sheath assembly facilitates the docking and disassembly of the lower and upper connecting seats, making it easy to replace the cutter head. In addition, the sheath assembly can protect the connection between the cutter head and the cutter holder, avoiding wear on the cutter holder. The sheath assembly can also be replaced after it wears out, resulting in better overall wear resistance and easier maintenance. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the structure of Embodiment 1 of this utility model; Figure 2 This is a schematic front view of the structure of the sheath removal assembly in Embodiment 1 of this utility model; Figure 3 This is a schematic cross-sectional view of the sheath assembly in Embodiment 1 of this utility model; Figure 4 This is a three-dimensional schematic diagram of the structure of Embodiment 2 of this utility model; Figure 5 This is a three-dimensional schematic view of the lower connecting seat in Embodiment 2 of this utility model; Figure 6 This is a schematic cross-sectional view of the sheath assembly in Embodiment 2 of this utility model.

[0017] In the figure: 1. Tool holder, 2. Lower connecting seat, 3. Upper connecting seat, 4. Tool head, 5. Tool teeth, 6. Support body, 7. First through hole, 8. Sheath assembly, 81. Docking groove, 82. Shell, 83. First countersunk hole, 84. Side guard plate, 85. Main guard plate, 86. Second countersunk hole, 9. Second through hole. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1: Please see Figure 1 , Figure 2 , Figure 3 This utility model provides a split-type ripping knife: The device includes a cutter holder 1 and a cutter head 4. The top of the cutter head 4 has a groove formed by integral molding, and a support body 6 is formed between the grooves. Cutting teeth 5 are installed in the grooves by casting. There are 6 to 8 cutting teeth 5 evenly arranged in the horizontal direction. The cutting teeth 5 protrude from the support body 6, and the protrusion thickness is 1 to 2 mm. The hardness and wear resistance of the cutting teeth 5 are higher than those of the cutter head 4 and the support body 6. This design makes the connection strength of the cutting teeth 5 high, and when in contact with the material to be torn, it can give full play to its wear resistance characteristics, and tear the material efficiently with higher strength and hardness, thus extending the service life of the cutter head 4 and improving the efficiency and quality of the tearing operation.

[0020] The lower connecting seat 2 is integrally molded and fixedly installed on the upper side of the cutter holder 1, and the upper connecting seat 3 is integrally molded and fixedly installed on the lower side of the cutter head 4. The lower connecting seat 2 and the upper connecting seat 3 are connected by the protective sleeve assembly 8. When the cutter head 4 is damaged due to long-term use or strong impact and needs to be replaced, the protective sleeve assembly 8 facilitates the docking, installation and disassembly of the lower connecting seat 2 and the upper connecting seat 3, making it easy to replace the cutter head 4. Moreover, the protective sleeve assembly 8 can also be replaced after wear, making maintenance convenient and operation easy.

[0021] The structure of the sheath assembly 8 is as follows: The sheath assembly 8 includes a housing 82 and a first countersunk hole 83. The upper connecting seat 3 is inserted into the top of the mating groove 81, and the lower connecting seat 2 is inserted into the bottom of the mating groove 81. Both the upper connecting seat 3 and the lower connecting seat 2 are provided with a first through hole 7. The front and rear sides of the housing 82 are provided with first countersunk holes 83. The aligned first countersunk holes 83 and first through holes 7 are fitted with bolt sets. The bolt sets are existing components composed of internal hexagonal bolts and internal hexagonal threaded sleeves.

[0022] The upper connecting seat 3 and the lower connecting seat 2 are connected by end mating. The housing 82 not only protects the upper connecting seat 3 and the lower connecting seat 2, but also securely connects the upper connecting seat 3 and the lower connecting seat 2 with bolts. When the cutter head 4 needs to be replaced, only the bolts used to connect the cutter head 4 need to be disassembled. When the housing 82 needs to be replaced, all bolts need to be removed.

[0023] Four first through holes 7 are evenly provided on the upper connecting seat 3 and the lower connecting seat 2 along the horizontal direction. Four first countersunk holes 83 are provided on each side of the sleeve 82, and the four first countersunk holes 83 on the same side are distributed at the four corners of the virtual parallelogram.

[0024] This layout design allows the bolt assembly to apply uniform pressure to the upper connecting seat 3 and the lower connecting seat 2 from four more reasonable positions when they are connected, which further enhances the firmness and stability of the connection. Moreover, regardless of whether the cutter head 4 is flipped back and forth or the sleeve 82 is flipped back and forth for installation, there are aligned first through holes 7 and first countersunk holes 83 for installing the bolt assembly.

[0025] When the cutting head 4 is under stress, the parallelogram-shaped bolt group can distribute the load through the geometric characteristics of the quadrilateral, reducing the risk of bolt damage. In addition, the bolt spacing in the parallelogram layout is more reasonable. This avoids the load concentration caused by excessively small bolt spacing in traditional rectangular distributions, further improving the overall structural stability.

[0026] In addition, a docking groove 81 is provided on the top of the housing 82. The shape of the upper connecting seat 3 is adapted to the docking groove 81. The docking groove 81 is used to improve the installation accuracy of the upper connecting seat 3 and ensure convenient and accurate docking.

[0027] Example 2: Please see Figure 4 , Figure 5 , Figure 6 This utility model provides another type of split-type ripping knife: The difference from that in Embodiment 1 is that the connection method between the sheath assembly 8 and the lower connecting seat 2 and the upper connecting seat 3 is different, and the specific structure is as follows.

[0028] The lower connecting seat 2 has a seat groove on its front side, and the upper connecting seat 3 is inserted into the seat groove. Both the upper connecting seat 3 and the lower connecting seat 2 have four second through holes 9. The four second through holes 9 on each side are arranged in a rectangular array. Since the sides of the upper connecting seat 3 and the lower connecting seat 2 abut against each other, the second through holes 9 have sufficient space. Therefore, the rectangular array arrangement is adopted to provide installation space for the bolt group.

[0029] The structure of the sheath assembly 8 is as follows: The sheath assembly 8 includes a main sheath 85 and a side sheath 84. Both the main sheath 85 and the side sheath 84 have a pair of second countersunk holes 86. The rear side of the lower connecting seat 2 and the front side of the upper connecting seat 3 have main sheath grooves. Two main sheaths 85 are installed in each main sheath groove. A bolt group is installed between the second through hole 9 and the second countersunk holes 86 on the main sheath 85. The bolt group connects the front and rear main sheaths 85 and also connects the upper connecting seat 3 and the lower connecting seat 2. The corresponding main sheath 85 can be removed by removing the bolt group. To separate the upper connecting seat 3 and the lower connecting seat 2, all bolt groups need to be removed.

[0030] The lower connecting seat 2 has side guard plate grooves on both the left and right sides. A side guard plate 84 is installed in the side guard plate groove. A screw hole is opened in the side guard plate groove. A screw is installed between the screw hole and the second countersunk hole 86 on the side guard plate 84. The corresponding side guard plate 84 can be removed by removing the screw. In addition, there are two side guard plates 84 on each side, which are distributed in a V-shape. This can better withstand the force during tearing operations. And after the main guard plate 85 and the side guard plate 84 are worn out, they can be replaced individually.

[0031] The casing 82, main guard plate 85, side guard plate 84, and blade teeth 5 are preferably made of titanium carbide, which has excellent wear resistance and scratch resistance, making it more suitable for rock breaking operations.

[0032] In addition, a wear-resistant layer is welded to the surface of the support body 6. The wear-resistant layer is formed by welding a special alloy surface (such as molybdenum-chromium-boron alloy) onto the surface using a welding overlay technique. This improves the wear resistance, corrosion resistance, and heat resistance of the working surface, thereby reducing costs and improving overall performance and service life.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A split-type ripping knife, characterized in that: It includes a tool holder (1) and a tool head (4). The top of the tool head (4) is provided with a groove, and a support body (6) is formed between the grooves. A tool tooth (5) is installed in the groove by casting. The tool tooth (5) protrudes from the support body (6). The lower connecting seat (2) is fixedly installed on the upper side of the blade holder (1), and the upper connecting seat (3) is fixedly installed on the lower side of the blade head (4). The lower connecting seat (2) and the upper connecting seat (3) are connected by a sheath assembly (8).

2. The split-type ripping knife according to claim 1, characterized in that: The sheath assembly (8) includes a housing (82) and a first countersunk hole (83). The upper connecting seat (3) is inserted into the top of the mating groove (81), and the lower connecting seat (2) is inserted into the bottom of the mating groove (81). Both the upper connecting seat (3) and the lower connecting seat (2) are provided with a first through hole (7). The front and rear sides of the housing (82) are provided with first countersunk holes (83). Bolt sets are installed in the aligned first countersunk holes (83) and first through holes (7).

3. The split-type ripping knife according to claim 2, characterized in that: The first through hole (7) is evenly provided in four horizontal directions on the upper connecting seat (3) and the lower connecting seat (2). The first countersunk hole (83) is provided on each side of the sleeve (82), and the four first countersunk holes (83) on the same side are distributed at the four corners of the virtual parallelogram.

4. The split-type ripping knife according to claim 2, characterized in that: The top of the casing (82) is provided with a docking groove (81), and the shape of the upper connecting seat (3) is adapted to the docking groove (81).

5. The split-type ripping knife according to claim 1, characterized in that: The lower connecting seat (2) has a seat groove on its front side, and the upper connecting seat (3) is inserted into the seat groove. Both the upper connecting seat (3) and the lower connecting seat (2) have four second through holes (9), and the four second through holes (9) on each side are arranged in a rectangular array.

6. The split-type ripping knife according to claim 5, characterized in that: The sheath assembly (8) includes a main sheath plate (85) and a side sheath plate (84). A pair of second countersunk holes (86) are provided on both the main sheath plate (85) and the side sheath plate (84). Main sheath plate grooves are provided on the rear side of the lower connecting seat (2) and the front side of the upper connecting seat (3). Two main sheath plates (85) are installed in each main sheath plate groove. A bolt group is installed between the second through hole (9) and the second countersunk holes (86) on the main sheath plate (85). Side sheath plate grooves are provided on both the left and right sides of the lower connecting seat (2). Side sheath plates (84) are installed in the side sheath plate grooves. Screw holes are provided in the side sheath plate grooves. Screws are installed between the screw holes and the second countersunk holes (86) on the side sheath plate (84).

7. The split-type ripping knife according to claim 6, characterized in that: There are two side guards (84) on each side, and they are arranged in a V-shape.

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