Novel fastening center hob

Abstract

The utility model belongs to the field of shield equipment, and provides a novel fastening center hob which comprises a hob body, a bearing, a hob ring, a floating oil seal, a left end cover, a right end cover and a hob shaft, the cover edges of the left end cover and the right end cover are matched with the hob body and the floating oil seal in an embedded mode, and a countersunk head groove is formed in the end portion of the right end cover. The right end of the cutter shaft is provided with a shaft shoulder matched with the countersunk groove, the right end face of the cutter shaft is provided with a positioning hole, the end, away from the shaft shoulder, of the cutter shaft does not exceed the end face of the bearing, the end, away from the shaft shoulder, of the cutter shaft is provided with an embedding opening, and the center of the embedding opening is provided with a center threaded hole. A countersunk threaded hole is formed in the center of the convex hull, and a center bolt connected with the left end cover and the cutter shaft is arranged in the countersunk threaded hole. The novel fastening center hobbing cutter is reasonable in design, simple in structure, convenient to disassemble and assemble, beneficial for ensuring the reliability of bolt connection and the stability of the cutter body, and suitable for large-scale popularization.

Description

Technical Field

[0001] The utility model belongs to the field of shield equipment, in particular to a novel fastening center hob. Background Art

[0002] The shield equipment is a large-scale complete set of construction equipment specially used for excavating underground tunnels. The cutterhead is one of the key components of the shield machine and is the main working part of the shield. The shield will encounter various strata during underground excavation, from silt, clay, sand layers to soft rock and hard rock. During excavation, the cutterhead is subjected to complex forces and has a harsh working environment. It is a part that needs to be inspected and repaired. The cutterhead structure is related to the excavation efficiency, service life and tool cost of the shield. As the main working tool on the cutterhead, the installation reliability of the roller cutter has a direct impact on the cutterhead and the excavation capacity of the shield machine.

[0003] The existing center hob includes a cutter body, bearing, cutter ring, cutter shaft, end cover and connecting bolts, etc. Among them, the cutter shaft adopts a structure that is connected through the cutter body, so the end cover maintains the design of end contact, and then connected with bolts. For example, patent CN207144948U discloses an end cover type double floating seal single blade center hob, and in this case, it is necessary to use multiple connecting bolts with flange distribution characteristics, so the workload of the disassembly and assembly process is relatively large; moreover, the connecting bolts will be subjected to large shear force in the actual working process, and are prone to breakage, affecting the working performance of the end cover and the cutter body. Utility Model Content

[0004] The utility model aims at solving the technical problems existing in the installation and fixing of the above-mentioned center hob and proposes a new type of fastening center hob with reasonable design, simple structure, convenient assembly and disassembly, which is beneficial to ensuring the reliability of bolt connection and the stability of the cutter body.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the utility model provides a new type of fastening center hob, including a cutter body, the inner ring and the outer ring of the cutter body are respectively provided with bearings and cutter rings, floating oil seals are provided at both ends of the bearing, left end cover and right end cover are provided at both ends of the cutter body, a cutter shaft is provided at the center of the cutter body, the cover edges of the left end cover and the right end cover are both nested with the cutter body and the floating oil seal, the end of the right end cover is provided with a countersunk groove, the right end of the cutter shaft is provided with a shaft shoulder matching the countersunk groove, a positioning hole is provided on the right end surface of the cutter shaft, the end of the cutter shaft away from the shaft shoulder does not exceed the end surface of the bearing, the end of the cutter shaft away from the shaft shoulder is provided with an embedding, the center of the embedding is provided with a central threaded hole, the end of the left end cover facing the cutter shaft is provided with a convex bulge matching the embedding, the center of the convex bulge is provided with a countersunk threaded hole, a central bolt connecting the left end cover and the cutter shaft is provided in the countersunk threaded hole, and the central bolt is interference fit with the central threaded hole.

[0006] Preferably, a locking ring is provided in the countersunk threaded hole, and the locking ring is used to fix the head end of the center bolt.

[0007] Preferably, the locking ring comprises a ring body, the inner wall of the ring body is provided with a hexagonal hole, and the edge of the hexagonal hole is provided with a cylindrical opening.

[0008] Preferably, an annular groove is provided on the outer wall of the convex bump, and an O-ring is provided in the annular groove.

[0009] Compared with the prior art, the advantages and positive effects of the utility model are:

[0010] 1. The utility model provides a new type of fastening center hob, which can connect the left end cover, the right end cover and the cutter shaft with only one center bolt, reducing the amount of disassembly work; the left end cover is embedded in the cutter shaft, relying on the left end cover to bear the shear force, avoiding the breakage of the center bolt, and ensuring the overall reliability of the center hob; furthermore, the locking ring is used to lock to prevent the center bolt from loosening. The new type of fastening center hob provided by the utility model has a reasonable design, a simple structure, and is easy to disassemble and assemble, which is conducive to ensuring the reliability of the bolt connection and the stability of the cutter body, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 A cross-sectional view of a novel fastening center hob in the AA direction provided in the embodiment;

[0013] Figure 2 A front view of a novel fastening center hob provided in an embodiment;

[0014] Figure 3 A schematic diagram of the structure of a locking ring provided in an embodiment;

[0015] In the above figures, 1, cutter body; 2, bearing; 3, cutter ring; 4, floating oil seal; 5, left end cover; 51, convex bump; 52, countersunk threaded hole; 6, right end cover; 61, countersunk groove; 7, cutter shaft; 71, shaft shoulder; 72, positioning hole; 73, embedded mouth; 74, center threaded hole; 8, center bolt; 9, locking ring; 91, ring body; 92, hexagonal hole; 93, cylindrical mouth; 10, O-ring. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0018] Examples, such as Figure 1 , Figure 2 and Figure 3 As shown, the utility model provides a novel fastening center hob, comprising a cutter body 1, the inner ring and outer ring of the cutter body 1 are respectively provided with a bearing 2 and a cutter ring 3, floating oil seals 4 are provided at both ends of the bearing 2, a left end cover 5 and a right end cover 6 are provided at both ends of the cutter body 1, and a cutter shaft 7 is provided at the center of the cutter body 1. Among them, the cutter body 1, the bearing 2, the cutter ring 3, and the floating oil seal 4 are existing mature technologies, and this embodiment will not be repeated here. The utility model proposes an improvement on the connection mode of the left end cover 5, the right end cover 6 and the cutter shaft 7, thereby, the cover edges of the left end cover 5 and the right end cover 6 are nested with the cutter body 1 and the floating oil seal 4, the end of the right end cover 6 is provided with a countersunk groove 61, the right end of the cutter shaft 7 is provided with a shaft shoulder 71 matched with the countersunk groove 61, a positioning hole 72 is provided on the right end surface of the cutter shaft 7, the end of the cutter shaft 7 away from the shaft shoulder 71 does not exceed the end surface of the bearing 2, the end of the cutter shaft 7 away from the shaft shoulder 71 is provided with an inlay 73, the center of the inlay 73 is provided with a center threaded hole 74, the end of the left end cover 5 facing the cutter shaft 7 is provided with a convex bulge 51 matching with the inlay 73, the center of the convex bulge 51 is provided with a countersunk threaded hole 52, a center bolt 8 connecting the left end cover 5 and the cutter shaft 7 is provided in the countersunk threaded hole 52, and the center bolt 8 is interference fit with the center threaded hole 74.

[0019] Specifically, the coverage area of ​​the left end cover 5 and the right end cover 6 is larger than that of the transmission end cover, and the portion close to the cover edge can establish a sealed nesting relationship with the cutter body 1 and the floating oil seal 4. Regarding the connection of the two end covers, the utility model provides a new type of fastening center hob that can connect the left end cover 5, the right end cover 6 and the cutter shaft 7 with only one center bolt 8, effectively reducing the amount of disassembly work. At the same time, the right end of the cutter shaft 7 is embedded in the right end cover 6 through the shaft shoulder 71 and the countersunk groove 61, and the left end cover 5 is embedded in the cutter shaft 7 through the convex bulge 51 and the embedded opening 73. On the left end face of the tool, the left end cover 5 is relied on to bear the shear force, which can avoid the breakage of the center bolt 8 and ensure the overall reliability of the center hob.

[0020] Furthermore, the utility model provides a locking ring 9 in the countersunk threaded hole 52 , and the locking ring 9 is used to fix the head end of the center bolt 8 , and the locking ring 9 is used to lock and prevent the center bolt 8 from loosening.

[0021] In order to improve the practicality and reliability of the locking ring 9, the locking ring 9 provided by the utility model includes a ring body 91, the inner wall of the ring body 91 is provided with a hexagonal hole 92, and the edge of the hexagonal hole 92 is provided with a cylindrical opening 93, and the opening section of the cylindrical opening 93 is C-shaped. Among them, the ring body 91 can be pressed on the end cover by interference nesting after the center bolt 8 is connected and fixed, and the hexagonal surface of the center bolt 8 is limited by the hexagonal hole 92, and the cylindrical opening 93 can make an angle for the edge of the center bolt 8, thereby reducing the probability of the center bolt 8 pulling the locking ring 9.

[0022] In order to improve the sealing performance between the left end cover 5 and the blade shaft 7, an annular groove is provided on the outer wall of the convex bulge 51, that is, the matching surface between the convex bulge 51 and the embedding 73, and an O-ring 10 for sealing is provided in the annular groove.

[0023] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A novel fastening center hob, comprising a cutter body, wherein the inner ring and the outer ring of the cutter body are respectively provided with bearings and cutter rings, both ends of the bearings are provided with floating oil seals, both ends of the cutter body are provided with left end caps and right end caps, and the center of the cutter body is provided with a cutter shaft, characterized in that: The cover edges of the left end cover and the right end cover are both nested with the cutter body and the floating oil seal, the end of the right end cover is provided with a countersunk groove, the right end of the cutter shaft is provided with a shoulder that matches the countersunk groove, a positioning hole is provided on the right end face of the cutter shaft, the end of the cutter shaft away from the shoulder does not exceed the end face of the bearing, the end of the cutter shaft away from the shoulder is provided with an embedding opening, the center of the embedding opening is provided with a center threaded hole, the end of the left end cover facing the cutter shaft is provided with a convex bulge matching the embedding opening, the center of the convex bulge is provided with a countersunk threaded hole, a center bolt connecting the left end cover and the cutter shaft is provided in the countersunk threaded hole, and the center bolt is interference fit with the center threaded hole.

2. A novel fastening center hob according to claim 1, characterized in that: A locking ring is arranged in the countersunk threaded hole, and the locking ring is used to fix the head end of the central bolt.

3. A novel fastening center hob according to claim 2, characterized in that: The locking ring comprises a ring body, the inner wall of the ring body is provided with a hexagonal hole, and the edge of the hexagonal hole is provided with a cylindrical opening.

4. A novel fastening center hob according to claim 3, characterized in that: An annular groove is arranged on the outer wall of the convex bump, and an O-ring is arranged in the annular groove.

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