Three-ring gear milling hob structure
By designing a three-ring milling cutter structure and adopting a wear-resistant cutting layer and piston lubrication assembly, the problem of insufficient wear resistance of traditional cutters in highly abrasive soft soil strata was solved, achieving efficient and stable vertical shaft excavation.
Patent Information
- Application Number
- CN202422312698.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-09-20
AI Technical Summary
Traditional shaft excavation tools have insufficient wear resistance in highly abrasive soft soil strata, resulting in rapid wear of the cutter rollers, short service life, and impact on construction costs and schedule.
The design incorporates a three-ring milling hob structure, employing a wear-resistant cutting layer and a piston lubrication assembly to improve wear resistance and sealing performance, thereby enhancing cutting uniformity and structural stability.
It significantly improves the wear resistance and service life of the cutter head, reduces construction costs, and improves tunneling efficiency and project quality.
Smart Images
Figure CN223689704U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the vertical shaft hob field especially relates to a tooth milling hob structure. BACKGROUND
[0002] Under the background of modern engineering technology, as a unique underground structure form, the vertical shaft has a straight hole wall like a pipe, and is similar to a naturally formed collapse funnel, and has variable plane morphology, including square, strip and irregular circular, and exhibits high engineering adaptability and flexibility. The vertical shaft not only has small land occupation, but also significantly reduces the construction interference to the surrounding environment, and therefore plays a crucial role in water conservancy and hydropower engineering, and is widely used in water taking, water diversion, ventilation, slag removal and air supplement and other links.
[0003] However, in the tunneling operation of the vertical shaft, especially in the soft soil layer, especially under the complex geological conditions of high abrasion and deep excavation requirements, the traditional tunneling tools such as ordinary wedge hob are facing severe challenges. The wedge teeth design of these hobs is often limited in height, and the wear resistance is insufficient, which leads to rapid wear of the hob in the long-time and high-intensity tunneling process, and the service life is greatly reduced. This not only increases the construction cost, but also seriously affects the engineering progress and the overall quality of the vertical shaft.
[0004] In view of the above problems, an innovative hob structure is needed, which can maintain efficient and stable tunneling performance in high-abrasion soft soil layer, and significantly improve the wear resistance and service life of the hob. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a three-ring tooth milling hob structure to solve the problems in the above background technology, and uses the three-ring tooth milling hob with a wear-resistant cutting layer to improve the drilling depth of a single hob tooth. The piston lubricating assembly is designed to improve the sealing effect of the hob.
[0006] To achieve the above object, the utility model provides the following technical scheme: a three-ring tooth milling hob structure, comprising a main shaft, a hob body is rotatably arranged on the main shaft, three ring tables are circumferentially arranged on the outer side wall of the hob body, a ring groove is arranged between two adjacent ring tables, a tooth milling part is uniformly arranged on the outer circumferential surface of the ring table around the shaft, the diameter of the ring table decreases linearly along the length direction of the main shaft, the cross section of the tooth milling part is trapezoidal, and a wear-resistant cutting layer is arranged on the top of the tooth milling part. First end cover and second end cover are arranged on the main shaft corresponding to the two sides of the hob body, an axial hole is formed in one end of the main shaft, and a piston lubricating assembly is arranged in the axial hole.
[0007] In order to further optimize the utility model, the following technical scheme can be preferred:
[0008] Preferably, the piston lubrication assembly comprises a piston tube coaxially arranged in the shaft hole, a piston arranged in the piston tube, and grease arranged in the piston tube, and the main shaft is provided with an oil discharge hole, and the grease in the piston tube enters the inner cavity of the cutter body through the oil discharge hole.
[0009] Preferably, one end of the piston tube is provided with a plug, and the piston tube is filled with grease between the piston and the plug.
[0010] Preferably, the cutter body and the surface of the main shaft are rotationally connected through a bearing.
[0011] Preferably, the main shaft is a stepped shaft, the main shaft is provided with a bearing shoulder in the middle, the main shaft is provided with a thrust bearing and a bearing sleeve on both sides of the bearing shoulder, the bearing sleeve and the main shaft are uniformly arranged with rollers around the shaft, and the main shaft is provided with a sliding groove corresponding to the position of the roller.
[0012] Preferably, the floating seal ring and the floating seal ring seal are arranged between the first end cover, the second end cover and the bearing sleeve.
[0013] Preferably, the O-shaped seal ring is arranged at the position where the bearing retainer, the first end cover and the second end cover contact the cutter body.
[0014] The three-ring tooth milling cutter structure has the following beneficial effects.
[0015] 1) Improve drilling depth and efficiency: by designing a three-ring tooth milling structure, the milling teeth arranged uniformly on each ring platform can more effectively disperse the cutting force, reduce vibration and impact during cutting, thereby significantly improving the drilling depth of a single cutter tooth. At the same time, this design also enhances the adaptability of the cutter under complex geological conditions, making the tunneling operation more efficient and stable.
[0016] 2. Enhance wear resistance: the milling teeth adopt trapezoidal cross-section design, and are coated with a wear-resistant cutting layer at the top, which greatly improves the wear resistance of the cutter. When working in high abrasive strata, the wear-resistant cutting layer can effectively resist wear, prolong the service life of the cutter, reduce the replacement frequency, and reduce the construction cost.
[0017] 3. Optimize cutting effect: the arrangement of the three-ring tooth milling makes the cutting process more uniform and continuous, which helps to reduce resistance during cutting and improve cutting efficiency. At the same time, the linear decrease of the ring platform diameter along the length direction of the main shaft makes the cutting force reasonably distributed in the main shaft direction, further improving the cutting effect.
[0018] 4. Improved sealing and lubrication performance: The first end cover, second end cover, and piston lubrication assembly inside the shaft hole on the main shaft collectively form a high-efficiency sealing and lubrication system. This design not only improves the sealing effect of the hob during operation, preventing cutting heat and impurities from damaging the tool, but also provides continuous lubrication support for the hob through the piston lubrication assembly, ensuring stable operation of the hob in harsh working conditions.
[0019] 5. Enhanced structural stability: The overall design of the three-ring tooth milling hob structure is compact and reasonable, with tight cooperation between components, effectively improving the structural stability of the hob. In the process of high-speed rotation and heavy load cutting, the hob can maintain a stable operating state, reducing the likelihood of failure and improving the safety and reliability of construction.
[0020] In summary, the three-ring tooth milling hob structure disclosed in the present application has significant benefits in multiple aspects, providing a more efficient and reliable tool selection for vertical shaft excavation and other engineering operations. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 is a three-dimensional structure of a three-ring tooth milling hob Figure 1 ;
[0022] Figure 2 is a three-dimensional structure of a three-ring tooth milling hob Figure 2 ;
[0023] Figure 3 is a front view of a three-ring tooth milling hob;
[0024] Figure 4 is a schematic diagram of the internal structure of a three-ring tooth milling hob.
[0025] In the figure: 1, main shaft; 2, hob body; 3, ring table; 4, ring groove; 5, tooth milling part; 6, wear-resistant cutting layer; 7, first end cover; 8, second end cover; 9, shaft hole; 10, piston tube; 11, oil drain hole; 12, piston; 13, plug; 14, bearing shoulder; 15, thrust bearing; 16, bearing sleeve; 17, roller; 18, floating seal ring; 19, O-ring seal. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all.
[0027] Please refer to Figures 1-4The application discloses a three-ring tooth milling hob structure, which comprises a main shaft 1, a hob body 2 rotatably arranged on the main shaft, three ring tables 3 arranged on the outer side wall of the hob body in the circumferential direction, ring grooves 4 arranged between two adjacent ring tables, tooth milling parts 5 evenly arranged on the outer circumferential surface of the ring table around the shaft, a diameter of the ring table linearly decreasing along the length direction of the main shaft, a cross section of the tooth milling part being a trapezoidal shape, and a wear-resistant cutting layer 6 arranged on the top of the tooth milling part; the wear-resistant material layer (selected from tungsten carbide particles or tungsten carbide powder) is applied to the tooth milling part by means of flame, spraying or welding (the specific principle is that the wear-resistant welding wire is in a molten state when the welding is performed, and then the tungsten carbide particles or tungsten carbide powder is suspended into the molten wear-resistant welding pool), so that the wear reserve of a single tooth milling part is increased, the drilling depth of a single hob is improved, the problem that the service life of the hob is affected due to the low height and small wear reserve of the wedge-shaped teeth of the existing shaft hob is solved, the drilling construction efficiency is greatly improved, the shaft construction operation period is ensured, and the use requirement of the operator is met.
[0028] A first end cover 7 and a second end cover 8 are respectively arranged on the main shaft and correspond to the two sides of the hob body, an axial hole 9 is formed in one end of the main shaft in the axial direction, and a piston lubricating assembly is arranged in the axial hole 9; the piston lubricating assembly comprises a piston pipe 10 coaxially arranged in the axial hole, a piston 12 arranged in the piston pipe, and lubricating grease arranged in the piston pipe; an oil discharge hole 11 is formed in the main shaft, the lubricating grease in the piston pipe enters the inner cavity of the hob body through the oil discharge hole, a plug 13 is arranged at one end of the outer side of the piston pipe, and the lubricating grease is filled between the piston and the plug 13 in the piston pipe; in use, lubricating oil is injected into the inside of the piston pipe, so that the lubricating oil enters the inner cavity of the hob body, then the piston and the O-ring are placed into the inside of the piston pipe, then the lubricating grease is filled outside the piston, the plug (oil plug) is tightly screwed, the hob body is sealed, the sealing effect of the hob is increased, the phenomenon of lubricating oil leakage or mud infiltration is reduced, the service life and the construction efficiency of the equipment are improved, the precision requirement of the main shaft hole on the main shaft is reduced by using the piston pipe, the standard size of the piston and the O-ring assembly is convenient to use, the convenience of hob maintenance is improved, and the production and maintenance cost of the hob is reduced.
[0029] The hob body and the surface of the main shaft are rotatably connected through a bearing, the main shaft is a stepped shaft, a bearing shoulder 14 is arranged in the middle of the main shaft, one thrust bearing 15 and one bearing sleeve 16 are arranged at positions corresponding to the two sides of the bearing shoulder of the main shaft, rolling pins 17 are evenly arranged around the shaft between the bearing sleeve 16 and the main shaft, and sliding grooves are arranged on the main shaft and correspond to the positions of the rolling pins, that is, one thrust bearing and one supporting bearing are arranged on each side, the hob body is installed and supported, and the hob body is cooperated with the integrated structure, so that the service life of the hob is greatly prolonged, and the drilling construction efficiency is improved.
[0030] The floating seal ring 18 and the floating seal ring seal are arranged between the first end cover, the second end cover and the bearing ring.
[0031] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.
Claims
1. A three-lobed gear-milling hob construction, characterized by: The application relates to a main shaft, wherein a hob body is arranged on the main shaft in a rotating mode, three ring tables are arranged on the outer wall of the hob body in a circumferential direction, a ring groove is arranged between two adjacent ring tables, a milling tooth part is uniformly arranged on the outer circumferential surface of the ring table around the shaft, the diameter of the ring table linearly decreases along the length direction of the main shaft, the cross section of the milling tooth part is trapezoidal, and a wear-resistant cutting layer is arranged on the top of the milling tooth part.
2. A three-ringed gear-milling hob structure according to claim 1, characterized in that: The first end cover and the second end cover are arranged on the main shaft corresponding to the two sides of the hob body, one end of the main shaft is provided with a shaft hole in the axial direction, and a piston lubricating assembly is arranged in the shaft hole.
3. A three-ringed gear-milling hob structure according to claim 2, characterized in that: The piston lubricating assembly comprises a piston tube coaxially arranged in the shaft hole, a piston arranged in the piston tube, and grease arranged in the piston tube.
4. The three-ringed gear-milling hob structure according to claim 1, characterized in that: One end of the piston tube is provided with a plug, and the piston tube is filled with grease between the piston and the plug.
5. A three-ringed gear-milling hob structure according to claim 4, characterized in that: The hob body and the surface of the main shaft are rotationally connected through a bearing.
6. The structure of a three-ring gear milling hob according to claim 1, characterized in that: The main shaft is a stepped shaft, the middle part of the main shaft is provided with a bearing stop shoulder, the positions corresponding to the two sides of the bearing stop shoulder of the main shaft are respectively provided with one thrust bearing and one bearing sleeve, the bearing sleeve and the main shaft are uniformly arranged with rollers around the shaft, and the main shaft is provided with a sliding groove corresponding to the position of the roller.
7. The structure of a three-ring gear milling hob according to claim 2, characterized in that: The first end cover, the second end cover and the bearing sleeve are all provided with floating seal rings and floating seal ring sealing rings. The outer circumferences of the bearing stop ring, the first end cover and the second end cover are all provided with O-shaped sealing rings at the contact positions with the hob body.