Hobbing cutter with eccentric connecting shaft and end cover structure
By adopting an eccentric coupling end cap structure in the hob, the problem of bolt breaking when the hob is subjected to alternating impact load is solved, the axial bearing capacity of the hob is improved and the service life of the hob is extended, and the construction efficiency of the pipe header is improved.
Patent Information
- Application Number
- CN202420700603.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-07
AI Technical Summary
When existing eccentric hobs withstand large alternating impact loads, the bolts are prone to break, resulting in floating seal failure, bearing scrapping and complete tool scrapping, affecting the propulsion efficiency of the pipe hoisting machine.
The eccentric connecting shaft end cover structure hob is slidally connected to the inlay tool body through the eccentric rotating shaft and is integrated with the upper and lower end covers to increase the axial bearing capacity of the hob.
It extends the service life of the hob, improves the axial bearing capacity of the hob, reduces the number of times the pipe hob is shut down and tool change, and improves construction efficiency.
Smart Images
Figure CN222596070U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pipe jacking machines, in particular to an eccentric coupling end cover structure type hob. Background Art
[0002] The statements in this section merely provide background art related to the present disclosure and do not necessarily constitute prior art.
[0003] The toothed cutter is suitable for excavating the formation with uniaxial saturated compressive strength of rock ≤60Mpa, but there are many uncertain factors in the soft formations of sandstone, gravel sandstone and coarse sandstone with high quartz mica content, which makes the cutter bear complex radial and axial forces. Especially for eccentric cutters, the axial force tests the overall bearing capacity of the cutter.
[0004] The inventors found that the end covers and the cutter shaft on both sides of the existing eccentric hob are connected by bolts. When the hob is subjected to a large alternating impact load, coupled with the large eccentric displacement of the shaft heads at both ends, the bolts are easily broken, causing the floating seal to fail, the bearing to be scrapped, and the entire cutter to be scrapped, seriously affecting the propulsion efficiency of the pipe jacking machine. Utility Model Content
[0005] In order to solve the above problems, the utility model proposes an eccentric coupling end cover structure type hob. The utility model solves the technical problem that the bolts are easy to break when the hob is subjected to a large alternating impact load.
[0006] According to some embodiments, the utility model adopts the following technical solutions:
[0007] The embodiment of the present application discloses an eccentric coupling end cover structure type roller cutter, comprising: a toothed cutter body and an eccentric rotating shaft; the eccentric rotating shaft passes through the center of the toothed cutter body, the eccentric rotating shaft is slidably connected to the toothed cutter body, one side of the eccentric rotating shaft is connected to the upper end cover by bolts, and the other side of the eccentric rotating shaft is integrally connected to the coupling lower end cover.
[0008] Furthermore, the center of the upper end cover is eccentric to the center of the connecting shaft lower end cover.
[0009] Furthermore, a first O-ring is provided between one side of the eccentric rotating shaft and the upper end cover.
[0010] Furthermore, a plurality of cutting teeth are arranged on the outer wall of the insert cutter body.
[0011] Furthermore, a tapered roller bearing is arranged inside the insert cutter body.
[0012] Furthermore, the tapered roller bearings are coaxially arranged in parallel inside the insert cutter body.
[0013] Furthermore, bearing spacer rings are installed between adjacent tapered roller bearings.
[0014] Furthermore, a second O-ring is provided between the tapered roller bearing and the outer wall of the eccentric shaft.
[0015] Furthermore, the shaft head parts of the lower end cover and the upper end cover of the coupling are fixed to the cutter head of the pipe jacking machine through a roller cutter fastening device.
[0016] Furthermore, the cutter disc of the pipe jacking machine is located at the edge of the pipe jacking machine.
[0017] Compared with the prior art, the utility model has the following beneficial effects: the structure of the eccentric rotating shaft and the lower end cover of the connecting shaft integrally formed in the utility model increases the axial bearing capacity of the hob, prolongs the service life of the hob, and avoids the problem of insufficient bearing capacity of the hob caused by the conventional connection between the cutter shaft and the end cover by bolts. It reduces the number of times the pipe jacking machine stops to change cutters, reduces the workload of construction workers, and improves production efficiency.
[0018] Combined with reasonable heat treatment process, the bending and fracture resistance of the cutter shaft is effectively increased, thereby extending the service life of the cutter, improving the quality of the hob product, and improving the construction efficiency of the pipe jacking machine. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.
[0020] Figure 1 It is a structural schematic diagram of the utility model.
[0021] Figure 2 This is a schematic diagram of the structure of the lower end cover of the connecting shaft of the utility model.
[0022] Figure 3 It is a schematic diagram of the upper end cover structure of the utility model.
[0023] Description of reference numerals:
[0024] Figure 1 , Figure 2 and Figure 3 The corresponding relationship between the component names and the reference numerals is as follows:
[0025] 1. Insert cutter body 2. Coupling lower end cover 3. Tapered roller bearing 4. Upper end cover 5. Bolts 6. First O-ring 7. Floating seal assembly 8. Floating seal seat 9. Second O-ring 10. Bearing spacer ring. DETAILED DESCRIPTION
[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0027] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.
[0028] In the present utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present utility model. They do not specifically refer to any part or element in the present utility model and cannot be understood as limitations on the present utility model. In the present utility model, terms such as "fixedly connected", "connected", "connected" and the like should be understood in a broad sense, indicating that they can be fixedly connected, integrally connected or detachably connected; they can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present utility model can be determined according to specific circumstances, and they cannot be understood as limitations on the present utility model.
[0029] Embodiment 1
[0030] like Figure 1 As shown, an eccentric shaft-connecting end cover structure type roller cutter comprises: a toothed cutter body 1 and an eccentric rotating shaft; the eccentric rotating shaft passes through the center of the toothed cutter body 1, the eccentric rotating shaft is slidably connected to the toothed cutter body 1, one side of the eccentric rotating shaft is connected to the upper end cover 4 by a bolt 5, a first O-ring 6 is also provided between the one side of the eccentric rotating shaft and the upper end cover, and the other side is integrally connected to the lower end cover 2 of the shaft connection, and the center of the upper end cover 4 is eccentric to the center of the lower end cover 2 of the shaft connection. Due to the eccentric rotating shaft, the eccentric roller cutter will generate a certain vibration in the process of rock breaking, so that the roller cutter can achieve the effect of vibration milling rock breaking, thereby further improving the performance of the roller cutter in rock breaking.
[0031] A plurality of teeth are arranged on the outer wall of the insert cutter body 1. The teeth are made of wear-resistant high-strength alloy steel, which can enhance the wear resistance and crushing ability of the teeth.
[0032] Two tapered roller bearings 3 are arranged inside the insert cutter body 1. The tapered roller bearings 3 are coaxially arranged in parallel inside the insert cutter body 1, and the tapered roller bearings 3 are single-row tapered roller bearings 3. The tapered roller bearings 3 are arranged to improve the adjustment performance and load-bearing capacity of the hob starting torque.
[0033] A bearing spacer ring 10 is installed between adjacent tapered roller bearings 3 . The bearing spacer ring 10 is coaxial with the eccentric rotating shaft. The bearing spacer ring 10 is provided to balance the lateral stress of the two tapered roller bearings 3 .
[0034] Specifically, a second O-ring 9 is provided between the tapered roller bearing 3 and the outer wall of the eccentric shaft, and the O-ring strengthens the sealing between the upper end cover and the eccentric shaft.
[0035] The shaft head parts of the lower end cover 2 and the upper end cover 4 of the coupling are fixed to the cutter disc of the pipe jacking machine through the cutter fastening device. The installation position of the cutter is at the edge of the pipe jacking machine. The characteristics of the eccentric cutter and the special position at the edge of the pipe jacking machine determine that the axial force on the cutter is very large. When the pipe jacking machine moves forward, the cutter starts to break the rock. The toothed cutter body 1 and the tapered roller bearing 3 are rotating bodies, and the remaining parts are stationary bodies. During the rock breaking process, the various alternating loads on the cutter are transmitted to the eccentric shaft through the toothed cutter body 1 and the tapered roller bearing 3. When the eccentric shaft and the lower end cover of the coupling are an integrated structure, the axial bearing capacity of the cutter shaft is greatly improved, thereby extending the service life of the cutter.
[0036] Combined with reasonable heat treatment process, the bending and fracture resistance of the cutter shaft is effectively increased, thereby extending the service life of the cutter, improving the quality of the hob product, and improving the construction efficiency of the pipe jacking machine.
[0037] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.
Claims
1. An eccentric coupling end cover structure hob, characterized in that: include: Insert cutter body and eccentric shaft; the eccentric shaft passes through the center of the insert cutter body, the eccentric shaft is slidably connected to the insert cutter body, one side of the eccentric shaft is connected to the upper end cover by bolts, and the other side of the eccentric shaft is integrally connected to the lower end cover of the connecting shaft.
2. The eccentric coupling end cover structure hob according to claim 1, characterized in that: The center of the upper end cover is eccentric to the center of the lower end cover of the connecting shaft.
3. The eccentric coupling end cover structure hob according to claim 1, characterized in that: A first O-type sealing ring is arranged between one side of the eccentric rotating shaft and the upper end cover.
4. The eccentric coupling end cover structure hob according to claim 1, characterized in that: A plurality of cutter teeth are arranged on the outer wall of the insert cutter body.
5. The eccentric coupling end cover structure type hob as claimed in claim 4, characterized in that: A tapered roller bearing is arranged inside the insert cutter body.
6. The eccentric coupling end cover structure hob as claimed in claim 5, characterized in that: The tapered roller bearings are coaxially arranged in parallel inside the insert cutter body.
7. The eccentric coupling end cover structure hob according to claim 6, characterized in that: Bearing spacer rings are installed between adjacent tapered roller bearings.
8. The eccentric coupling end cover structure hob according to claim 7, characterized in that: A second O-type sealing ring is arranged between the tapered roller bearing and the outer wall of the eccentric shaft.
9. The eccentric coupling end cover structure type hob as claimed in claim 1, characterized in that: The shaft head parts of the lower end cover and the upper end cover of the coupling are fixed to the cutter head of the pipe jacking machine through a hob fastening device.
10. The eccentric coupling end cover structure hob according to claim 9, characterized in that: The cutter disc of the pipe jacking machine is located at the edge of the pipe jacking machine.