Shield tunneling machine cutter with high wear resistance

Abstract

The utility model discloses a shield tunneling machine cutter with high wear resistance, and relates to the technical field of shield tunneling machine cutters. The shield tunneling machine cutter with the high abrasion resistance comprises a cutter shaft, a cutter hub is in key connection with the outer portion of the cutter shaft, a cutter ring is welded outside the cutter hub, the cutter ring comprises a cutting edge and oblique angles symmetrically arranged at the left end and the right end of the cutting edge, and abrasion-resistant welding spots are welded to the surfaces of the oblique angles in a rectangular array mode. In order to overcome the defect that the surface of the cutter of the shield tunneling machine is very easy to wear, a plurality of circles of cutter tooth groups are arranged, the number of contact points of cutter tooth cutting edges and rock soil is increased, cutting force is dispersed, the wear speed of the cutting edges is reduced, the coverage area of wear-resistant materials can be increased through ceramic welding layers, wear-resistant welding spots and wear-resistant welding rods, and the service life of the cutter is prolonged. The abrasion resistance of the surface of the cutter is guaranteed through the inner and outer layered structure, toughness support is provided for the cutter through the inner layer, and embrittlement of the abrasion-resistant layer is prevented.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine (TBM) cutting tool technology, specifically a TBM cutting tool with high wear resistance. Background Technology

[0002] The cutterhead of a tunnel boring machine (TBM) is a key component that directly contacts the rock and soil and performs cutting operations. When operating in harsh geological conditions such as sandstone strata or highly abrasive gravel strata, the cutterhead will be subjected to enormous pressure, friction, and impact, which places extremely high demands on the wear resistance of the cutterhead.

[0003] During long-term cutting operations, the cutting edge and surface of traditional tunnel boring machine cutters are prone to rapid wear, which reduces the cutting ability of the cutters and affects the tunneling speed. Furthermore, surface wear can affect the stability of the overall cutter structure, increasing the risk of cutter damage and leading to frequent cutter replacements, which in turn delays the project schedule.

[0004] Therefore, in order to solve the defect that the surface of the tunnel boring machine cutter is easily worn, it is necessary to propose a tunnel boring machine cutter with high wear resistance. Utility Model Content

[0005] The purpose of this utility model is to provide a shield machine cutter with high wear resistance. By using an alloy layer, a ceramic welding layer, wear-resistant welding points, and wear-resistant welding rods, the coverage area of ​​the wear-resistant material can be increased, thereby reducing the friction and impact forces of rock and soil on the cutter. The inner and outer layered structure not only ensures the wear resistance of the cutter surface, but also provides toughness support for the cutter through the inner layer, preventing the wear-resistant layer from cracking, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A shield tunneling machine cutter with high wear resistance includes a cutter shaft, a cutter hub externally keyed to the cutter shaft, a cutter ring welded to the outside of the cutter hub, an alloy layer inlaid at the left and right ends of the cutter hub, and the cutter ring including a cutting edge and bevels symmetrically arranged at the left and right ends of the cutting edge, and wear-resistant weld points welded to the rectangular array on the surface of the bevels.

[0008] The cutting edge is provided with multiple cutting teeth in a circular array, and wear-resistant welding rods are welded between adjacent cutting teeth. The cutting edge is reinforced with a ceramic welding layer at the left and right ends of the cutting teeth.

[0009] Both the cutting edge and the bevel adopt an inner and outer layered structure. The outer layer is a wear-resistant welding layer, which includes the cutting teeth, wear-resistant welding rod, ceramic welding layer and wear-resistant welding points. The inner layer is a tough welding layer.

[0010] Preferably, the cutter shaft is welded with retaining rings at the front and rear ends of the cutter hub for limiting its position.

[0011] Preferably, the front and rear ends of the blade hub are sealed with end caps.

[0012] Preferably, silicon carbide particles are added inside the cutting teeth.

[0013] Preferably, the wear-resistant weld layer material is WC-Co hard alloy, and the toughness weld layer material is high-strength alloy steel.

[0014] Preferably, the diameter of the alloy layer is 9-12 mm.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This shield machine cutter with high wear resistance has silicon carbide particles added to the cutting edge, which not only increases the contact area between the cutting edge and the rock and soil and improves the cutting force, but also can accommodate the rock and soil debris cut off through the gap between the cutting edge and reduce the wear of the debris on the cutting edge.

[0017] 2. This shield machine cutter with high wear resistance, through the design of alloy layer, ceramic welding layer, wear-resistant welding rod and wear-resistant welding point, can increase the coverage area of ​​wear-resistant material at the cutting edge, share the wear pressure of the cutter, reduce the wear rate of the cutter ring, and thus improve the overall wear resistance of the cutter.

[0018] 3. This shield machine cutter, which has high wear resistance, provides necessary toughness support to the cutter while ensuring the wear resistance of the cutter surface through its internal and external layered structure. When the cutter is subjected to a large impact force, the tough weld layer can prevent the wear-resistant layer from cracking and maintain the integrity of the cutter structure, thereby further improving the overall wear resistance of the cutter. Attached Figure Description

[0019] Figure 1 This is a top view of the overall structure of this utility model;

[0020] Figure 2 This is a left view of the overall structure of this utility model.

[0021] In the diagram: 1. Cutter shaft; 2. End cap; 3. Cutter hub; 31. Alloy layer; 4. Cutter ring; 41. Cutting edge; 411. Cutting tooth; 412. Wear-resistant welding rod; 413. Ceramic welding layer; 42. Bevel angle; 421. Wear-resistant welding point; 43. Wear-resistant welding layer; 44. Tough welding layer; 5. Snap ring. Detailed Implementation

[0022] Please see Figures 1-2A shield machine cutter with high wear resistance includes a cutter shaft 1, a cutter hub 3 externally connected to the cutter shaft 1, a cutter ring 4 welded to the cutter hub 3, the cutter ring 4 including a cutting edge 41 and oblique angles 42 symmetrically arranged at the left and right ends of the cutting edge 41, and wear-resistant weld points 421 welded to the rectangular array on the surface of the oblique angles 42.

[0023] The cutting edge 41 has a ring array of multiple cutting teeth 411, and wear-resistant welding rods 412 are welded between adjacent cutting teeth 411. The cutting edge 41 is reinforced with ceramic welding layer 413 at the left and right ends of the cutting teeth 411.

[0024] Among them, silicon carbide particles are added to the cutting teeth 411, which provides additional wear-resistant protection for the cutting teeth 411, greatly extending the service life of the cutting teeth 411, thereby improving the wear resistance of the entire cutting edge 41.

[0025] The design of ceramic weld layer 413, wear-resistant welding rod 412 and wear-resistant welding point 421 increases the coverage area of ​​wear-resistant material at the cutting edge 41 and bevel angle 42, which shares the wear pressure and effectively reduces the wear rate of the cutting ring 4.

[0026] Please see Figures 1-2 Both the cutting edge 41 and the bevel angle 42 adopt an inner and outer layer structure. The outer layer is a wear-resistant weld layer 43, which includes a cutting tooth 411, a wear-resistant welding rod 412, a ceramic welding layer 413, and a wear-resistant welding point 421. The inner layer is a tough welding layer 44. The wear-resistant weld layer 43 is made of WC-Co hard alloy, and the tough welding layer 44 is made of high-strength alloy steel.

[0027] Among them, the surfaces of the cutting teeth 411, wear-resistant welding rod 412, ceramic welding layer 413, wear-resistant welding point 421, cutting edge 41 and bevel angle 42 all constitute wear-resistant welding layer 43, which enables the tool to resist the friction and wear of rock and soil more effectively during cutting and maintain a sharp cutting edge.

[0028] The tough weld layer 44 can absorb and disperse the impact force on the tool, avoid the impact force from concentrating on the wear-resistant weld layer 43, and play a supporting and protective role for the wear-resistant weld layer 43, maintaining the structural stability of the wear-resistant weld layer 43 and preventing damage such as cracks or peeling from occurring in the wear-resistant weld layer 43.

[0029] Please see Figures 1-2 The cutter shaft 1 is located at the front and rear ends of the cutter hub 3 and is fitted with retaining rings 5 ​​for limiting movement.

[0030] The design of the retaining ring 5 can effectively prevent the tool hub 3 from moving axially on the tool shaft 1, thus playing an axial limiting role and ensuring the stability of the connection between the tool hub 3 and the tool shaft 1, so that the cutting force can be stably transmitted between the tool shaft 1 and the tool hub 3.

[0031] Please see Figures 1-2The front and rear ends of the blade hub 3 are sealed with end caps 2.

[0032] Among them, the end cap 2 is sealed and installed at the front and rear ends of the cutter hub 3. This structure helps to enhance the sealing of the entire internal structure of the cutter and also prevents external impurities from entering the inside of the tunnel boring machine cutter.

[0033] Please refer to Figures 1-2 The blade hub 3 has alloy layers 31 embedded at both ends, and the diameter of the alloy layers 31 is 9-12mm.

[0034] During operation, the two ends of the tool hub 3 often experience significant friction and wear. The inlaid alloy layer 31 can effectively resist this wear, reduce the amount of wear, and extend the service life of the tool hub 3.

[0035] Working Principle: This shield machine cutter, with its high wear resistance, features multiple rings of silicon carbide-particle-added cutting teeth 411 at the cutting edge 41. This not only increases the contact area between the cutting edge 41 and the rock and soil, improving cutting force, but also allows the gaps between the cutting teeth 411 to accommodate the cut rock and soil debris, reducing wear on the cutting edge 41. The design of the ceramic weld layer 413, wear-resistant welding rod 412, and wear-resistant welding point 421 increases the coverage area of ​​wear-resistant material at the cutting edge 41 and the bevel angle 42, distributing the wear pressure on the cutter and reducing the wear rate of the cutting ring 4, thereby improving the overall wear resistance of the cutter. The inner and outer layered structure ensures the wear resistance of the cutter surface while providing necessary toughness support. When the cutter is subjected to a large impact force, the toughness weld layer 44 can prevent the wear-resistant layer from cracking, maintaining the integrity of the cutter structure, thus further improving the overall wear resistance of the cutter.

Claims

1. A shield tunneling machine cutter with high wear resistance, comprising a cutter shaft (1), a cutter hub (3) externally keyed to the cutter shaft (1), and a cutter ring (4) welded to the outside of the cutter hub (3), characterized in that: The blade hub (3) is inlaid with an alloy layer (31) at both ends. The blade ring (4) includes a cutting edge (41) and oblique angles (42) symmetrically arranged at the left and right ends of the cutting edge (41). The oblique angles (42) are welded with wear-resistant welding points (421) in a rectangular array on their surface. The cutting edge (41) is provided with a ring array of multiple cutting teeth (411), and wear-resistant welding rods (412) are welded between adjacent cutting teeth (411). The cutting edge (41) is reinforced with ceramic welding layer (413) at the left and right ends of the cutting teeth (411). Both the cutting edge (41) and the bevel (42) adopt an inner and outer layer structure. The outer layer is a wear-resistant welding layer (43), which includes a cutting tooth (411), a wear-resistant welding rod (412), a ceramic welding layer (413), and a wear-resistant welding point (421). The inner layer is a tough welding layer (44).

2. The shield machine cutter with high wear resistance according to claim 1, characterized in that: The cutter shaft (1) is welded with retaining rings (5) at the front and rear ends of the cutter hub (3) for limiting movement.

3. The shield machine cutter with high wear resistance according to claim 1, characterized in that: The front and rear ends of the blade hub (3) are sealed with end caps (2).

4. The shield machine cutter with high wear resistance according to claim 1, characterized in that: Silicon carbide particles are added inside the blade teeth (411).

5. The shield machine cutter with high wear resistance according to claim 1, characterized in that: The wear-resistant weld layer (43) is made of WC-Co hard alloy, and the tough weld layer (44) is made of high-strength alloy steel.

6. The shield machine cutter with high wear resistance according to claim 1, characterized in that: The diameter of the alloy layer (31) is 9-12 mm.

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