CN219034727U

CN219034727U - Hob cutter ring with wear-resistant nano ceramic coating

Info

Publication number: CN219034727U
Application number: CN202223167179.9U
Authority: CN
Inventors: 田庆芬; 李刚
Original assignee: Shanghai Inframat Nano Technology Co ltd
Current assignee: Shanghai Inframat Nano Technology Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-05-16
Anticipated expiration: 2032-11-28

Abstract

The utility model discloses a hob ring with a wear-resistant nano ceramic coating, which comprises a hob ring body, wherein an outward protruding part is circumferentially and circumferentially arranged at the middle part of the outer side of the hob ring body, transverse transition sections which are circumferentially distributed are symmetrically arranged at the upper side and the lower side of the protruding part, and the transverse transition sections are connected with the hob ring body through longitudinal transition sections which are circumferentially distributed; the surfaces of the transverse transition section and the longitudinal transition section are provided with nano ceramic protective coatings, and the outer side surfaces of the protruding parts are provided with wear-resistant nano ceramic coatings. After the nano coating is prepared, the wear resistance of the hob ring is greatly improved, the integrity of the whole structure of the hob ring is guaranteed, the stress in the hob ring is uniform, the service life is prolonged by more than 5 times, the tunneling quantity and the production efficiency are finally improved, the number of times of tool changing is reduced, and the use cost of the shield machine and the waste of resources are saved.

Description

Hob cutter ring with wear-resistant nano ceramic coating

Technical Field

The utility model belongs to the technical field of shield tunneling machine accessories, and particularly relates to a hob ring with a wear-resistant nano ceramic coating.

Background

Along with the continuous development of road traffic construction in China, tunnels or subways play an important role in relieving traffic pressure, the application of shield machines is more and more widely in tunnel or subway construction at present, a shield hob is one of the cutters of the shield machines, and the function of propelling a front is played in construction. The shield hob is composed of a hob ring and hob teeth. Alloy steel is generally selected as a base material of the cutter ring, and cutter teeth are brazed or embedded hard alloy. The hard alloy cutter tooth plays roles in rolling and cutting rock and soil, and the cutter ring plays a supporting and protecting role on the hard alloy cutter tooth.

The shield hob is affected by the soil condition and the random change of the underground water pressure, and continuously pushed, jacked, scraped, impacted and worn along with the continuous pushing of construction and the continuous rotation of the cutterhead. The abrasion of the hob is not only limited to the cutter tooth part, crack and damage are easy to occur to the side face of the cutter ring under the collision of stone blocks generated by construction, the damage can possibly change to the stress condition of the whole cutter ring, the abrasion of the hob is aggravated, the cutter is required to be frequently replaced, and the tunneling efficiency of the shield tunneling machine is difficult to improve.

Disclosure of Invention

Aiming at the problems, particularly the geological condition of TBM hard rock, the utility model provides a hob ring with a wear-resistant nano ceramic coating, and the wear-resistant and damage-resistant performance of the hob ring is worn and scrapped relative to the tunneling quantity of a hard alloy cutter at an Italian inlet of 100 meters, so that the hob ring can be greatly improved to more than 500 meters, the construction progress can be greatly improved, the frequency of replacing the cutter is reduced, and the working efficiency of a shield machine is improved.

In order to achieve the technical effects, the utility model adopts the following technical scheme:

the hob cutter ring with the wear-resistant nano ceramic coating comprises a cutter ring body, wherein an outward protruding part is circumferentially and circumferentially arranged in the middle of the outer side of the cutter ring body, the upper side and the lower side of the protruding part are symmetrically provided with transverse transition sections which are distributed in a circumferential direction, and the transverse transition sections are connected with the cutter ring body through longitudinal transition sections which are distributed in the circumferential direction; the surfaces of the transverse transition section and the longitudinal transition section are provided with nanometer protective coatings, and the outer side surfaces of the protruding parts are provided with metal ceramic alloy layers.

In some embodiments, any two adjacent wear posts are offset.

In some embodiments, the nano-wear resistant coating is a cermet composite layer.

In some embodiments, the binding force of the nano-cermet coating of the cermet alloy layer is 80-120MPa, the wear resistance is 1000 ten thousand revolutions without damage, and the nano-cermet coating has good toughness.

In some embodiments, the cermet alloy layer is prepared on the outer side surface of the protrusion by spraying.

In some embodiments, the nano-protective coating is made of a cermet material having a thickness of 100-150um.

The beneficial effects of the utility model are as follows:

1. the convex cutter head is arranged, so that the self-rotation capacity of the hob is improved, the eccentric wear is reduced, and the service life of the hob is prolonged;

2. the nano wear-resistant coating is prepared on the outer side of the protruding part contacted with TBM hard rock, so that the wear resistance and damage resistance of the nano wear-resistant coating are greatly improved, the loss is reduced, and the frequency of replacing a cutter is reduced;

3. the nanometer protective coating is prepared on the transition section of the cutter ring, which is favorable for keeping the structural integrity of the cutter ring and ensuring the internal stress of the cutter ring to be uniform.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of one embodiment of the present utility model;

fig. 3 is an enlarged view of a portion a in fig. 2.

In the figure:

1 protruding part, 2 horizontal transition section, 3 vertical transition section, 4 nanometer protective coating, 5 nanometer wear-resisting coating, 6 wear-resisting post.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

As shown in fig. 1-3, the hob ring with the wear-resistant nano ceramic coating comprises a hob ring body, wherein an outward protruding part 1 is circumferentially and circumferentially arranged at the middle part of the outer side of the hob ring body, transverse transition sections 2 which are circumferentially distributed are symmetrically arranged on the upper side and the lower side of the protruding part 1, and the transverse transition sections 2 are connected with the hob ring body through longitudinal transition sections 3 which are circumferentially distributed; the surfaces of the transverse transition section 2 and the longitudinal transition section 3 are provided with nano protection coatings 4, the outer side surfaces of the protruding parts 1 are provided with nano wear-resistant coatings 5, and the nano wear-resistant coatings 5 are metal ceramic alloy layers. The materials referred to herein may all be made using prior art techniques.

The nanometer protective coating 4 is prepared on the surfaces of the transverse transition section 2 and the longitudinal transition section 3 of the cutter ring, so that collision damage of the cutter ring main body by the crushed stone can be reduced, cracks or gaps are not easy to appear in the transition section provided with the nanometer protective coating 4, the integrity of the cutter ring structure is maintained, and the uniformity of stress in the cutter ring is ensured. The nano-protective coating 4 is made of a cermet material.

The nano wear-resistant coating 5 is prepared on the outer side surface of the protruding part 1 contacted with the stratum, so that the wear resistance and damage resistance of the protruding part 1 can be greatly improved, the wear consumption is reduced, the number of times of replacing a cutter is reduced, the downtime and cutter replacing time of the shield machine is shortened, and finally the tunneling efficiency of the whole shield machine is improved.

Adjacent wear-resisting posts 7 are arranged in a staggered manner. As shown in fig. 2, several wear posts 7 are provided on the left and right sides of the center line of the outer side surface of the protruding portion 1, and adjacent wear posts 7 are provided on different sides of the center line. So set up, when the hob rotates, the area that wear post 7 is scratched is bigger: if the wear-resistant columns 7 are all arranged on the central line of the outer side surface of the protruding part 1, the area marked by the wear-resistant columns 7 is only an arc line with the thickness similar to that of the wear-resistant columns; after the dislocation arrangement, the area marked by the wear-resistant column 7 becomes two or more arcs; the action range of the wear-resistant column 7 is enlarged, and the soil breaking and tunneling efficiency can be improved to a certain extent.

The nano wear-resistant coating 5 is a metal ceramic alloy layer, and the metal ceramic alloy layer is prepared on the outer side surface of the protruding part 1 in a spraying mode. The binding force of the nano metal ceramic coating is 80-120MPa, the wear resistance is 1000 ten thousand revolutions without damage, and the nano ceramic coating has good toughness.

The wear resistance of the protruding part can be effectively improved, and the service life of the protruding part is prolonged.

As in fig. 1-2, there is also a nano-protective coating 4 and a nano-wear resistant coating at the end of the hob.

The nano protective coating 4 is a nickel cobalt-based carbide layer, and the thickness of the nano protective coating is 100-150 mu m. In general, the nano coating is not too thick, and in general, the wear resistance of the coating is provided by the property of the nano material, and the nano protective coating 4 is accompanied by shrinkage process when cooling and solidifying, and tensile stress is generated in the particles when molten drops strike the substrate and cool and solidify rapidly, the size of the tensile stress is proportional to the thickness of the coating, and when the thickness of the coating reaches a certain degree, the tensile stress in the coating exceeds the bonding strength of the coating and the substrate or the bonding strength of the coating, and the coating is damaged. The nano protective coating 4 can enable the surface of the transition section of the hob ring to have good anti-collision effect under the thickness.

It will be apparent to those skilled in the art that various modifications to the above embodiments may be made without departing from the general spirit and concepts of the utility model. Which fall within the scope of the present utility model. The protection scheme of the utility model is subject to the appended claims.

Claims

1. The hob cutter ring with the wear-resistant nano ceramic coating is characterized by comprising a cutter ring body, wherein an outward protruding part (1) is circumferentially and circumferentially arranged in the middle of the outer side of the cutter ring body, transverse transition sections (2) distributed in a circumferential direction are symmetrically arranged on the upper side and the lower side of the protruding part (1), and the transverse transition sections (2) are connected with the cutter ring body through longitudinal transition sections (3) distributed in the circumferential direction; the surfaces of the transverse transition section (2) and the longitudinal transition section (3) are provided with nanometer protective coatings (4), and the outer side surfaces of the protruding parts (1) are provided with nanometer wear-resistant coatings (5).

2. Hob ring with wear-resistant nano-ceramic coating according to claim 1, characterized in that the protrusion (1) is provided with wear-resistant posts (7).

3. Hob ring with wear-resistant nano ceramic coating according to claim 2, characterized in that any adjacent two wear-resistant columns (7) are arranged offset.

4. Hob ring with wear-resistant nano-ceramic coating according to claim 1, characterized in that the nano-wear-resistant coating (5) is a metal-ceramic composite coating.

5. The hob ring with the wear-resistant nano ceramic coating according to claim 4, characterized in that the binding force of the metal ceramic composite coating is 80-120MPa, the wear resistance is 1000 ten thousand revolutions without damage, and the nano ceramic coating has good toughness.

6. Hob ring with wear-resistant nano-ceramic coating according to claim 5, characterized in that the cermet composite coating is prepared on the outer side surface of the protrusion (1).

7. Hob ring with wear-resistant nano-ceramic coating according to claim 1, characterized in that the nano-protective coating (4) is made of a cermet material with a thickness of 100-150um.