A new type of cutter device

Abstract

The utility model discloses a novel hobbing cutter device, including the cutter shaft and the cutter body subassembly of setting on the cutter shaft, the setting of cutter shaft and cutter body subassembly from both ends department is inwards all sequentially provided with end cover oil seal system, split type cylindrical roller bearing and roller, the cutter shaft is provided with the isolation positioning step shaft, still be provided with the installation ring groove on the cutter shaft of isolation positioning step shaft both sides, split type cylindrical roller bearing positioning is installed in the installation ring groove, still is provided with the positioning step on the both side wall of isolation positioning step shaft, the roller is set on both sides positioning step. The utility model has the technical characteristics of strong bearing capacity, long service life.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine cutting tool technology, specifically a novel rolling cutter device. Background Technology

[0002] A tunnel boring machine cutterhead is a rock-breaking tool that crushes rock by rolling and crushing it with a cutter ring.

[0003] When shield tunnel cutterheads are in use, they not only rotate around their own cutter shaft, but also revolve around the shield cutterhead. During this process, the entire cutterhead is subjected to axial and radial forces. Under working conditions with large load forces or large impact forces, the internal stress of the bearings inside the cutterhead will become localized. This will not only affect the free rotation of the cutterhead, but also make it very easy to be deformed, damaged and misaligned, resulting in a reduction in the service life of the cutterhead. Utility Model Content

[0004] The purpose of this utility model is to provide a new type of hobbing device, which has the technical characteristics of strong load-bearing capacity and long service life.

[0005] The objective of this utility model is mainly achieved through the following technical solution: a novel hobbing cutter device, comprising a cutter shaft and a cutter body assembly sleeved on the cutter shaft, wherein the cutter shaft and the cutter body assembly are provided with an end cap oil seal system, a split cylindrical roller bearing and a roller in sequence from both ends inward at the sleeve location; the cutter shaft is provided with an isolation positioning step shaft, and the cutter shaft on both sides of the isolation positioning step shaft is also provided with mounting ring grooves, the split cylindrical roller bearing is positioned and installed in the mounting ring grooves, and the two side walls of the isolation positioning step shaft are also provided with positioning steps, and the rollers are disposed on the positioning steps on both sides.

[0006] Based on the above technical solution, the inner side of the blade assembly is recessed at the isolation positioning step axis position to form a receiving cavity, and a lubricating grease layer is provided in the receiving cavity.

[0007] Based on the above technical solution, the end cap oil seal system includes a sealing end cap that is pressed against the cutter shaft and the cutter body assembly; two first sealing grooves are arranged side by side on the inner side of the cutter body assembly on the outer circumference of the sealing end cap, and a metal sealing ring and a first sealing ring are arranged sequentially from the outside to the inside in the two first sealing grooves; a second sealing groove is also provided on the outer circumference of the cutter shaft on the outer circumference of the sealing end cap, and a second sealing ring is installed in the second sealing groove.

[0008] Based on the above technical solution, the blade assembly includes a blade body and a smooth blade ring that is interference-fitted to the middle of the outer side of the blade body, and a high-hardness retaining ring is positioned and installed on the blade body on the side of the smooth blade ring.

[0009] Based on the above technical solution, the split cylindrical roller bearing is a split cylindrical roller bearing.

[0010] Based on the above technical solution, the split cylindrical roller bearing is composed of two sets of crescent-shaped bearing assemblies spliced ​​together; the crescent-shaped bearing assembly includes an outer ring, a cage, and an inner ring from the outside to the inside, and the cage is provided with a number of rollers at intervals; the groove raceway on the inner side of the outer ring is provided with a groove, and an elastic sheet is provided in the groove. A sponge is embedded in the elastic sheet, and the end face of the sponge extends out of the groove and is located in the groove raceway; the inner side of the outer ring is hollow to form an oil reservoir for storing lubricating oil, and a through hole is also provided on the inner side of the outer ring, which connects the inner side of the outer ring and the oil reservoir. The sponge extends into the oil reservoir through the through hole.

[0011] Based on the above technical solution, the elastic sheet is inclinedly disposed in the groove, with one end fixed in the groove and the other end connected to the sponge.

[0012] Based on the above technical solution, an oil injection hole communicating with the oil storage cavity is also provided on the outer side of the outer ring. The oil injection hole is a countersunk hole, and a rubber plug is interference-fitted inside the countersunk hole.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model, through the design of a positioning step shaft, mounting ring groove, and positioning step, isolates and positions the oil seal system of both end caps, split cylindrical roller bearings, and rollers, making installation convenient and precise. Simultaneous positioning and installation of the split cylindrical roller bearings and rollers ensures that the cutter body assembly and cutter shaft are evenly stressed when the hob is under load. The split cylindrical roller bearing and roller design further evenly distributes the stress, and the positioning step and mounting ring groove ensure effective installation and rotation. It also distributes the stress on the cutter body assembly evenly onto the cutter shaft, reducing the stress on the rollers and split cylindrical roller bearings, extending their service life. The overall hob structure has a stronger load-bearing capacity and a longer service life.

[0015] 2. This utility model adopts a split cylindrical roller bearing, which is not only easy to install, but also allows the lubricating oil in the oil reservoir of the bearing to continuously lubricate the cylindrical rollers of the bearing during its operation through the design of elastic plates and sponge bodies, thereby ensuring its long-term effective lubrication effect and playing a certain role in cooling, thus improving the overall service life of the bearing. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a first structural schematic diagram of the novel roller cutter device in the embodiment;

[0018] Figure 2 This is a schematic diagram of the second structure of the novel roller cutter device in the embodiment;

[0019] Figure 3 This is a schematic diagram of the structure of the split cylindrical roller bearing 4 in the embodiment;

[0020] Figure 4 This is a partial structural diagram of the outer ring of the split cylindrical roller bearing in the embodiment;

[0021] The labels in the diagram represent:

[0022] 1. Cutter shaft; 2. Cutter body assembly; 3. End cap oil seal system; 4. Split cylindrical roller bearing; 5. Roller; 6. Isolation and positioning stepped shaft; 7. Mounting ring groove; 8. Positioning step; 9. Receiving cavity; 10. Sealing end cap; 11. Metal sealing ring; 12. First sealing ring; 13. Second sealing ring; 14. Cutter body; 15. Smooth cutter ring; 16. High-hardness retaining ring; 17. Crescent-shaped bearing assembly; 18. Outer ring; 19. Cage; 20. Inner ring; 21. Groove; 22. Elastic sheet; 23. Sponge; 24. Oil reservoir; 25. Through hole; 26. Oil injection hole; 27. Rubber plug. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0024] like Figures 1-4 As shown, this utility model embodiment provides a novel hobbing device, including a cutter shaft 1 and a cutter body assembly 2 sleeved on the cutter shaft 1. From both ends inwards, the cutter shaft 1 and the cutter body assembly 2 are sequentially provided with an end cap oil seal system 3, a split cylindrical roller bearing 4, and rollers 5. The cutter shaft 1 is provided with an isolation positioning step shaft 6. Mounting annular grooves 7 are also provided on both sides of the isolation positioning step shaft 6. The split cylindrical roller bearing 4 is positioned and installed within the mounting annular grooves 7. Positioning steps 8 are also provided on both sides of the isolation positioning step shaft 6, and the rollers 5 are disposed on the positioning steps 8 on both sides.

[0025] In application, the split cylindrical roller bearing 4 and the inner rollers 5 all have the same rotational motion. This results in a more uniform force distribution on both components during the rotation of the cutter body assembly 2, and the two components rotate in the same direction. This ensures the smooth rotation of the cutter body assembly 2. Furthermore, under the action of the isolating positioning step shaft 6 and the positioning step 8, the installation and rolling positions of the rollers 5 are determined, allowing them to better support the cutter body assembly 2 and ensure its rotation. Simultaneously, the force on the rollers 5 is evenly distributed onto the cutter shaft 1. The unidirectional rotation of the rollers 5 further ensures consistency with the rotation direction of the cutter body assembly 2, guaranteeing the correct rotation of the cutter body assembly 2. The split cylindrical roller bearing 4 rotates continuously without any rotational deviation. Similarly, under the action of the mounting ring groove 7, it can not only achieve positioning and installation, but also play a good load-bearing role through the cutter shaft 1 when the cutter body assembly 2 rotates. When the cutter body assembly 2 rotates, the split cylindrical roller bearing 4 rotates in the same direction as the roller 5. The cutter body assembly 2, the split cylindrical roller bearing 4, and the roller 5 can all maintain a consistent rotation speed and direction, thus making the rotation of the cutter body assembly 2 smoother. At the same time, the split cylindrical roller bearing 4 can also bear the load evenly through the cutter shaft 1, resulting in more uniform force distribution and a significantly extended service life.

[0026] Meanwhile, when the new hobbing device revolves around the cutter disc, the cutter body assembly 2 is subjected to a certain axial force. At this time, the split cylindrical roller bearing 4 and the roller 5 are also subjected to axial force, which may affect normal rotation due to uneven force distribution, or even cause displacement, tilting, or damage. Based on the design of this embodiment, the roller 5 is positioned and installed by the positioning step 8, while the split cylindrical roller bearing 4 is installed by the mounting ring groove 7. Thus, the structural design on the cutter shaft 1 is used to position and support the two and provide axial positioning. By isolating the positioning step shaft 6 and the cutter shaft 1, the bearing effect of the roller 5 and the split cylindrical roller bearing 4 is provided, making the force on the two more uniform and reducing the local stress on the two. In this way, the entire hobbing structure forms an integral force-bearing structure, which can not only ensure the normal rotation of the cutter body assembly 1, but also ensure the normal rotation and use of the split cylindrical roller bearing 4 and the roller 5.

[0027] In practical applications, the inner side of the cutter body assembly 2, located at the isolation positioning step shaft 6, also has a recessed receiving cavity 9, which contains a lubricating grease layer. Before installation, a gel-type lubricating grease can be applied to the receiving cavity 9 to form the lubricating grease layer. During use, the cutter body assembly 2, rollers 5, and cutter shaft 1 become hot due to friction, and the lubricating grease softens to form a liquid softened oil that lubricates and cools the rollers 5, improving their rolling effect. Simultaneously, the lubricating grease can also enter the area of ​​the split cylindrical roller bearing 4 to lubricate it, solving the bearing lubrication problem. Specifically, the installation area of ​​the rollers 5 and the installation area of ​​the split cylindrical roller bearing 4 are interconnected, allowing for better lubrication of both through the exchange of lubricating grease.

[0028] In practical applications, the end cap oil seal system 3 includes a sealing end cap 10 that is pressed against the cutter shaft 1 and the cutter body assembly 2. Two first sealing grooves are arranged side-by-side on the inner side of the cutter body assembly 2 on the outer circumference of the sealing end cap 10. A metal sealing ring 11 and a first sealing ring 12 are sequentially arranged in the two first sealing grooves from the outside to the inside. A second sealing groove is also provided on the outer circumference of the cutter shaft 1 on the outer circumference of the sealing end cap 10, and a second sealing ring 13 is installed in the second sealing groove. In application, the sealing end cap 10 is fixed to the cutter body assembly 2 without affecting the rotation of the cutter shaft 1. It seals the area where the split cylindrical roller bearing 4 and the rollers 5 are located through the metal sealing ring 11, the first sealing ring 12, and the second sealing ring 13, ensuring the closed use of the lubricant inside. Since this part is prior art, the specific principle and structure will not be further described in this embodiment.

[0029] In practical applications, the blade assembly 2 includes a blade body 14 and a smooth blade ring 15 that is interference-fitted to the middle of the outer side of the blade body 14, and a high-hardness retaining ring 16 is positioned and installed on the blade body 14 on the side of the smooth blade ring 15.

[0030] In practical applications, the split cylindrical roller bearing 4 is composed of two sets of crescent-shaped bearing assemblies 17 spliced ​​together. The crescent-shaped bearing assembly 17 includes an outer ring 18, a cage 19, and an inner ring 20 from the outside to the inside. A plurality of rollers are spaced apart on the cage 19. The groove raceway on the inner side of the outer ring 18 is provided with a groove 21. An elastic sheet 22 is provided in the groove 21. A sponge 23 is embedded in the elastic sheet 22. The end face of the sponge 23 extends out of the groove 21 and is located in the groove raceway. The outer ring 18 is hollow inside to form an oil reservoir 24 for storing lubricating oil. A through hole 25 is also provided on the inner side of the outer ring 18, which connects the inner side of the outer ring 18 and the oil reservoir 24. The sponge 23 extends into the oil reservoir 24 through the through hole 25.

[0031] In implementation, the two sets of crescent-shaped bearing assemblies 17 are spliced ​​together to form a complete split cylindrical roller bearing 4, which can be easily installed in the mounting ring groove 7. During use, the part of the sponge 23 that extends into the oil storage cavity 24 continuously absorbs the lubricating oil stored in the oil storage cavity 24. In the initial state, the end face of the sponge 23 extends out of the groove 21 and is located in the groove raceway. When the roller rolls to the position of the sponge 23, it contacts and squeezes it. The lubricating oil absorbed in the sponge 23 is squeezed out and adheres to the roller. In this way, during continuous rotation, several rollers can be continuously lubricated by the sponge, which can play a long-term lubrication role.

[0032] In practical applications, the elastic sheet 22 is inclinedly disposed within the groove 21, with one end fixed within the groove 21 and the other end connected to the sponge body 23. During use, the elastic sheet 22 is elastic. When the roller rolls to the position of the sponge body 23 and contacts and compresses it, the elastic sheet 22 deforms slightly as the sponge body 23 is compressed. After the roller moves away, it recovers its deformation under the action of elasticity, ejecting the sponge body 23 back out of the groove 21 for lubrication with the next roller. This allows the sponge body 23 to continuously remain partially within the groove raceway, achieving a continuous lubrication effect.

[0033] In practical applications, the outer ring 18 is also provided with an oil injection hole 26 communicating with the oil reservoir 24. The oil injection hole 26 is a countersunk hole, and a rubber plug 27 is interference-fitted inside the countersunk hole. During installation or maintenance, lubricating oil can be injected into the oil reservoir 24 through the oil injection hole 26, making oiling convenient and quick. At the same time, the countersunk hole design can also prevent the rubber plug 27 from affecting the bearing installation.

[0034] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A novel hobbing device, comprising a cutter shaft and a cutter body assembly sleeved on the cutter shaft, characterized in that, The cutter shaft and cutter body assembly are fitted with an end cap oil seal system, a split cylindrical roller bearing and rollers in sequence from both ends inwards at the fitting points. The cutter shaft is provided with an isolation positioning step shaft, and the cutter shaft on both sides of the isolation positioning step shaft is also provided with mounting ring grooves. The split cylindrical roller bearing is positioned and installed in the mounting ring grooves. The two side walls of the isolation positioning step shaft are also provided with positioning steps, and the rollers are set on the positioning steps on both sides. in, The inner side of the blade assembly is recessed at the position of the isolation positioning step axis to form a receiving cavity, and a lubricating grease layer is provided in the receiving cavity.

2. The novel hobbing cutter device according to claim 1, characterized in that, The end cap oil seal system includes a sealing end cap that is pressed against the cutter shaft and the cutter body assembly sleeve. Two first sealing grooves are arranged side by side on the inner side of the blade assembly on the outer circumference of the sealing end cap. A metal sealing ring and a first sealing ring are arranged sequentially from the outside to the inside of the two first sealing grooves. A second sealing groove is also provided on the outer circumference of the cutter shaft on the outer side of the sealing end cover, and a second sealing ring is installed in the second sealing groove.

3. The novel hobbing cutter device according to claim 1, characterized in that, The blade assembly includes a blade body and a smooth blade ring that is interference-fitted to the middle of the outer side of the blade body, and a high-hardness retaining ring is positioned and installed on the blade body on the side of the smooth blade ring.

4. The novel hobbing cutter device according to claim 1, characterized in that, The split cylindrical roller bearing is composed of two sets of crescent-shaped bearing assemblies spliced ​​together. The crescent-shaped bearing assembly includes, from the outside to the inside, an outer ring, a cage, and an inner ring, with a plurality of rollers spaced apart on the cage; The inner side of the outer ring has a groove in the raceway, and an elastic sheet is provided in the groove. A sponge is embedded in the elastic sheet, and the end face of the sponge extends out of the groove and is located in the raceway. The outer ring has a hollow interior forming an oil storage cavity for storing lubricating oil. The inner side of the outer ring is also provided with a through hole, which connects the inner side of the outer ring and the oil storage cavity. The sponge extends into the oil storage cavity through the through hole.

5. The novel hobbing cutter device according to claim 4, characterized in that, The elastic sheet is inclinedly disposed in the groove, with one end fixed in the groove and the other end connected to the sponge.

6. The novel hobbing cutter device according to claim 4, characterized in that, The outer ring is also provided with an oil injection hole that communicates with the oil storage chamber. The oil injection hole is a countersunk hole, and a rubber plug is interference-fitted inside the countersunk hole.

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