Novel tooth-shaped shield tunneling machine hob cutter ring

Abstract

The utility model provides a novel tooth-shaped shield tunneling machine hob cutter ring which comprises a base body and a friction ring, the friction ring is arranged on the outer circle of the base body in a sleeved mode, the thickness of the friction ring is smaller than that of the base body, and a plurality of grooves are distributed in the peripheral face of the friction ring in the circumferential direction of the friction ring. The method has the characteristic of improving the rock breaking efficiency of the hob of the shield tunneling machine in a low-strength rock stratum.

Description

Technical Field

[0001] The utility model relates to the technical field of shield machine cutters, in particular to a novel toothed shield machine hob cutter ring. Background Art

[0002] At present, shield machines often encounter rock layers during tunnel excavation operations. Roll cutters are usually used as the main cutter for rock breaking operations of shield machines. The core component of the roll cutter is the cutter ring. Traditional cutter rings are generally bare cutter rings. Rock breaking operations involve installing the roll cutter on the cutterhead of the shield machine. The roll cutter revolves with the cutterhead. When the cutterhead is subjected to thrust and rotation, the cutter ring is subjected to the reaction force of the rock face to drive the roll cutter to rotate, thereby breaking the rock.

[0003] Regarding the above-mentioned related technologies, due to different geological and hydrological conditions and different rock strengths, the reaction forces of rock jaws of different strengths on the cutter ring are different, and the two are in a proportional relationship. When the rock strength is extremely low, the reaction force on the cutter ring is small, the roller cutter is not easy to rotate, and the cutter ring continues to rotate with the cutter disc, which is prone to failure due to eccentric wear of the roller cutter and low rock breaking efficiency. As a result, there is a problem that the rock breaking efficiency of the shield machine roller cutter in low-strength rock formations is not high enough.

[0004] In view of this, it is indeed necessary to provide a new type of technical solution for the toothed shield machine cutter ring to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a novel toothed shield machine cutter ring to solve the problem that the shield machine cutter has low rock breaking efficiency in low-strength rock formations.

[0006] In order to achieve the above purpose, the utility model provides a new type of toothed shield machine hob cutter ring, which adopts the following technical solutions:

[0007] A novel toothed shield machine cutter ring comprises a base and a friction ring. The friction ring is sleeved on the outer ring of the base. The thickness of the friction ring is smaller than that of the base. The outer peripheral surface of the friction ring is provided with a plurality of grooves distributed along the circumference of the friction ring.

[0008] As an optimization of a new type of toothed shield machine hob cutter ring, a plurality of grooves are evenly spaced and arranged on the outer peripheral surface of the friction ring, and the longitudinal section of the friction ring is sawtooth-shaped.

[0009] As an optimization of a new type of toothed shield machine cutter ring, a tungsten carbide coating is provided on the surface of the friction ring.

[0010] Compared with the prior art, the beneficial effects of the utility model are: by installing a friction ring on the outer ring of the base, the thickness of the friction ring is smaller than the thickness of the base, so that the friction ring is sharper than the base, thereby improving the rock breaking effect of the cutter ring; by opening a plurality of grooves along the circumferential direction on the outer peripheral surface of the friction ring, the roughness of the outer peripheral surface of the friction ring can be increased, the friction force of the outer peripheral surface of the cutter ring can be increased, the reaction force on the roller cutter can be increased, and the failure of the roller cutter due to eccentric wear can be reduced, thereby improving the rock breaking efficiency of the shield machine roller cutter in low-strength rock layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 This is a schematic diagram of the overall structure of a new type of toothed shield machine cutter ring in Example 1 of the present application;

[0013] Figure 2 This is a front view of the friction ring of Example 1 of the present application;

[0014] Figure 3 This is a schematic longitudinal section diagram of a novel toothed shield machine cutter ring in Example 1 of the present application;

[0015] Figure 4 This is a front view of the friction ring of Example 2 of the present application.

[0016] In the figure: 1. base; 2. friction ring; 3. groove. DETAILED DESCRIPTION

[0017] In order to make the technical solution and advantages of the utility model clearer, the utility model and its beneficial effects will be further described in detail below in conjunction with specific implementation methods and drawings of the specification, but the implementation methods of the utility model are not limited thereto.

[0018] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0019] The following is combined with Figure 1-4 , further details of this application are given.

[0020] Example 1

[0021] The present application provides a new type of toothed shield machine cutter ring, which adopts the following technical solution:

[0022] Reference Figure 1 The new toothed shield machine cutter ring includes a base 1 and a friction ring 2. The base 1 is in a circular ring shape, and the friction ring 2 is also in a circular ring shape. The thickness of the friction ring 2 is less than that of the base 1, so that the friction ring 2 is sharper than the base 1, reducing the contact area of ​​the outer peripheral surface of the cutter ring, making the stress of the outer peripheral surface of the cutter ring more concentrated, which is beneficial to improving the rock breaking ability of the cutter ring, thereby improving the rock breaking effect of the cutter.

[0023] Further, refer to Figure 2 The outer surface of the friction ring 2 is provided with a plurality of grooves 3 along the circumference of the friction ring 2. The grooves 3 are linear grooves that run from one side of the friction ring 2 to the other side. The grooves 3 make the outer surface of the friction ring 2 more uneven, increase the roughness of the outer surface of the friction ring 2, and improve the friction force of the outer surface of the friction ring 2, so that the roller cutter is easier to rotate, and the failure of the roller cutter due to eccentric wear is reduced, thereby improving the rock breaking efficiency of the shield machine roller cutter in low-strength rock layers.

[0024] In the preferred embodiment of the present application, refer to Figure 3 , several grooves 3 on the outer peripheral surface of the friction ring 2 are evenly spaced and distributed on the outer peripheral surface of the friction ring 2, so that the roughness of the outer peripheral surface of the friction ring 2 is more uniform, so that the force acting on the outer peripheral surface of the friction ring 2 is more uniform, reducing the fluctuation of the impact load of the cutter ring during the rotation process, improving the stability of the cutter ring, and thus improving the efficiency of rock breaking. Further, the longitudinal section of the friction ring 2 is serrated. After several grooves 3 are evenly spaced on the outer peripheral surface of the friction ring 2, the outer ring of the friction ring 2 is integrally formed into a serrated shape. On the one hand, it makes it easier for the stress of the friction ring 2 to be concentrated on the edge of the sawtooth and applied to the rock, thereby improving the rock breaking effect of the cutter ring. On the other hand, the integrally formed sawtooth surface is not easy to fall off during use, thereby increasing the service life of the friction ring 2, which is conducive to improving the rock breaking effect.

[0025] In the preferred embodiment of the present application, both the substrate 1 and the friction ring 2 are made of H13 mold steel material. The hardness of the H substrate 1 and the friction ring 2 after heat treatment is HRC55-57. Then, a tungsten carbide coating is welded on the surface of the friction ring 2 by laser cladding, so that the hardness of the surface of the friction ring 2 is increased to HRC63-65, thereby increasing the hardness and wear resistance of the friction ring 2, and improving the service life of the friction ring 2, thereby improving the rock breaking efficiency of the cutter ring.

[0026] Example 2

[0027] Different from Example 1, reference Figure 4The groove 3 on the outer peripheral surface of the friction ring 2 is a sunken groove formed by partially sinking the outer peripheral surface of the friction ring 2 toward the base 1. Compared with the embodiment 1, the groove 3 of this embodiment can also change the roughness of the outer peripheral surface of the friction ring 2, improve the friction force of the outer peripheral surface of the friction ring 2, make the roller cutter easier to rotate, reduce the failure of the roller cutter due to eccentric wear, and thus improve the rock breaking efficiency of the shield machine roller cutter in low-strength rock layers.

[0028] The experimental principle of the embodiment of the present application is as follows: by setting a friction ring 2 with a smaller thickness on the outer ring of the base 1, the contact area of ​​the outer peripheral surface of the cutter ring is reduced, the outer ring of the cutter ring is sharper, and the rock breaking effect is improved; by opening a groove 3 on the friction ring 2, the friction force of the outer peripheral surface of the friction ring 2 is increased, so that the roller cutter is easier to rotate under the reaction force of the low-strength rock formation, and the eccentric wear failure of the roller cutter is reduced, thereby improving the problem that the rock breaking efficiency of the shield machine roller cutter in the low-strength rock formation is not high enough. Further, the grooves 3 are evenly spaced on the outer peripheral surface of the friction ring 2, so that the outer peripheral surface of the friction ring 2 is formed into a uniformly distributed sawtooth, on the one hand, the load on each part of the outer peripheral surface of the friction ring 2 is more uniform, and the stability of the operation of the cutter ring is increased; on the other hand, the stress on the outer peripheral surface of the friction ring 2 is more easily concentrated on the sawtooth for crushing, and the rock breaking effect is increased. Furthermore, a tungsten carbide coating is laser clad and welded on the surface of the friction ring 2 to increase the hardness of the surface of the friction ring 2, strengthen the wear resistance of the surface of the friction ring 2, and increase the service life of the friction ring 2, which is conducive to improving the rock breaking efficiency of the roller cutter.

[0029] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A new type of toothed shield machine hob cutter ring, characterized in that: It comprises a base body and a friction ring, wherein the friction ring is sleeved on the outer ring of the base body, the thickness of the friction ring is smaller than the thickness of the base body, and the outer peripheral surface of the friction ring is provided with a plurality of grooves distributed along the circumference of the friction ring.

2. A novel toothed shield machine hob cutter ring according to claim 1, characterized in that: A plurality of grooves are evenly spaced and arranged on the outer peripheral surface of the friction ring, and the longitudinal section of the friction ring is sawtooth-shaped.

3. The novel toothed shield machine cutter ring according to claim 1 is characterized in that: The surface of the friction ring is provided with a tungsten carbide coating.

Images