Novel replaceable advancing cutter inlaid with flaky diamond

Abstract

The utility model belongs to the technical field of large-diameter shield cutters, and particularly discloses a novel replaceable advancing cutter inlaid with flaky diamonds, which comprises an advancing cutter body, abrasion-resistant alloy is inlaid at the top cutting position of the advancing cutter body, and the flaky diamonds consistent with a cutting edge are inlaid on the outer side of the top cutting position of the advancing cutter body. The protective alloys are arranged on the outer sides of the diamonds respectively, the height of the protective alloys is not smaller than that of the diamonds, and the protective alloys can guarantee that the diamonds are effectively protected when the tunnel portal is broken, play a better role in soft soil, soft sand and fully weathered rock stratums, avoid tool changing and provide guarantee for subsequent long-distance tunneling.

Description

Technical Field

[0001] The utility model belongs to the technical field of large-diameter shield tooling tools, and particularly discloses a novel replaceable leading tool inlaid with flaky diamonds. Background Art

[0002] The replaceable guide cutter is the most widely used excavation tool for large-diameter shield machines in soft soil, soft sand and fully weathered rock formations. As the tool that allows the shield cutterhead to contact the tunnel face in advance, its main function is to destroy the internal stress of the rock and soil and the stability of the tunnel face, and to reduce the torque of the cutterhead in cutting the rock and soil. The replaceable guide cutter has a vital impact on the excavation efficiency. When the shield machine starts, it needs to break the tunnel door. Due to the presence of reinforced concrete, it often causes abnormal damage to the initially installed cutter. When encountering sandy soil layers and fully weathered rock formations that are highly abrasive but have little impact on the cutter, the guide cutter has a greater penetration rate and the cutter wears faster. In addition, as the cutter height decreases, the cutterhead torque increases, resulting in an increase in the cutterhead thrust, a slower excavation speed, and a reduced tool life. In order to ensure normal excavation, the cutter needs to be replaced frequently, which not only affects work efficiency but also increases construction costs.

[0003] In order to improve the wear resistance of the existing replaceable guide cutters, diamonds are usually embedded on the outside of the wear-resistant alloy at both ends of the cutting part. Due to the high hardness of the diamond, its wear resistance can be guaranteed. However, when the shield machine starts to break the tunnel, it is often easy to cause the outer diamond to break, thereby affecting the subsequent excavation. If the cutter is replaced, the construction cost will inevitably increase. Therefore, it is urgent to improve the structure of the replaceable guide cutter in order to effectively protect the diamond and ensure that the diamond can continue to play a role after the initial breaking door, thereby increasing the tool life, extending the excavation distance, improving construction efficiency, and reducing tool costs. Summary of the Invention

[0004] In order to solve the problems in the background technology, the utility model discloses a new replaceable leading tool inlaid with flake diamonds, including flake diamonds and protective alloys, which effectively protects the diamonds so that they can continue to excavate long distances after breaking the tunnel door, increase the service life of the tool, reduce the number of tool changes, and improve excavation efficiency.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0006] A new type of replaceable pilot knife inlaid with flake diamonds includes a pilot knife body, a wear-resistant alloy is inlaid in the cutting part of the top of the pilot knife body, and flake diamonds consistent with the cutting edge are inlaid on the outside of the cutting part of the top of the pilot knife body. Protective alloys are respectively provided on the outside of the diamonds, and the height of the protective alloys is not less than the height of the diamonds.

[0007] Furthermore, in the novel replaceable pilot cutter inlaid with flake diamonds, the wear-resistant alloy includes an intermediate alloy inlaid in the middle of the cutting part at the top of the pilot cutter body and main alloys inlaid at intervals on the outside of the intermediate alloy.

[0008] Furthermore, the new replaceable pilot knife inlaid with sheet diamonds has a sharp structure with the top and two side slopes of the pilot knife body being higher in the middle and lower on both sides.

[0009] Furthermore, the new replaceable pilot cutter inlaid with sheet diamonds has side alloy III, side alloy II and side alloy I inlaid on the inclined surfaces on both sides of the pilot cutter body in sequence from the inside to the outside.

[0010] Furthermore, the new replaceable pilot cutter inlaid with flake diamonds has a wear-resistant layer containing tungsten carbide particles clad on the surface of the exposed portion of the pilot cutter body.

[0011] Furthermore, the main alloy and the intermediate alloy of the new replaceable leading knife inlaid with flake diamonds are both made of KE12.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model discloses a new replaceable guide knife inlaid with flaky diamonds. The cutting part at the top of the guide knife body is inlaid with an intermediate alloy and a main alloy, the outer sides of the main alloys are respectively inlaid with diamonds, and a protective alloy is arranged on the outermost side. The protective alloy can ensure that the diamonds are effectively protected when breaking the tunnel door, and plays a better role in soft soil, soft sand and fully weathered rock formations, avoiding knife changes, and providing protection for subsequent long-distance excavation. In addition, since the alloy has a higher hardness and a larger wear reserve, and a tungsten carbide particle wear-resistant layer is welded on the surface of the guide knife body, the wear resistance of the entire guide knife is guaranteed, especially in abrasive formations such as soft soil, soft sand and fully weathered rock formations, long-distance excavation can be achieved, the tool life is increased, the number of knife changes is reduced, the excavation distance is extended, and the excavation efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the replaceable leading knife of the utility model;

[0015] Figure 2 This is a left-side structural diagram of the replaceable leading knife of the utility model;

[0016] Figure 3 This is a schematic diagram of the top view of the replaceable leading knife of the utility model;

[0017] Figure 4 yes Figure 1 Schematic diagram of the AA section structure;

[0018] In the above drawings: 1-protective alloy; 2-diamond; 3-main alloy; 4-intermediate alloy; 5-side alloy I; 6-side alloy II; 7-side alloy III; 8-wear-resistant layer, 9-pioneer knife body; 10-square groove; 11-circular hole. DETAILED DESCRIPTION

[0019] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0020] Combined with attachment Figure 1-4 , the utility model is described in detail. A new type of replaceable guide knife inlaid with flake diamonds, including a guide knife body 9, a square groove 10 is provided at the bottom of the guide knife body 9, and round holes 11 are provided on both sides of the square groove 10. The guide knife body 9 is connected to the normal pressure scraper seat by threaded pins passing through the square groove 10 and the round holes 11, and is installed on the front and edge of the large-diameter cutter disc. A wear-resistant alloy is inlaid on the cutting part of the top of the guide knife body 9, and a flake diamond 2 consistent with the cutting edge is inlaid on the outside of the cutting part of the top of the guide knife body 9. A protective alloy 1 is provided on the outside of the diamond 2, and the height of the protective alloy is not less than the height of the diamond. The protective alloy 1 can protect the diamond 2, avoid abnormal damage and breakage of the diamond 2 when the shield starts to break the tunnel door, and effectively protect the diamond 2 from continuing to excavate for a long distance after the tunnel door is broken, thereby increasing the service life of the tool, reducing the number of tool changes, and improving the excavation efficiency.

[0021] As an optional design, the new replaceable guide knife inlaid with flake diamonds is preferred. The wear-resistant alloy includes an intermediate alloy 4 inlaid in the middle of the top cutting part of the guide knife body 9 and a main alloy 3 inlaid at intervals on the outside of the intermediate alloy 4. The main alloy 3 and the intermediate alloy 4 are made of large-size, coarse-grained cemented carbide, and the material is KE12. The main components of the cemented carbide are tungsten carbide and cobalt, with a hardness of about HRA87. The hardness is about HRA87. While increasing the alloy wear reserve, the alloy hardness is improved, thereby ensuring the wear resistance of the tool.

[0022] As an optional design, the new replaceable pilot knife inlaid with sheet diamonds is preferred. The top and both side slopes of the pilot knife body 9 are sharp structures with high middle and low sides, which can more easily cut and penetrate the reinforced concrete structure of the tunnel portal, thereby improving construction efficiency.

[0023] As an optional design, the new replaceable guide knife inlaid with flake diamonds is preferably used. Side alloy III7, side alloy II6 and side alloy I5 are inlaid on the inclined surfaces on both sides of the guide knife body 9 in sequence from the inside to the outside, which jointly protect the top of the guide knife body 9, improve the wear resistance of the guide knife body 9, and prevent the guide knife body 9 from wearing out too quickly in soft soil and soft sand formations and fully weathered rock formations. Diamond 2, main alloy 3, intermediate alloy 4, side alloy I5, side alloy II6 and side alloy III7 are all brazed with high-frequency silver base to ensure welding strength.

[0024] As an optional design, the new replaceable guide knife inlaid with flake diamonds is preferably provided with a wear-resistant layer 8 containing tungsten carbide particles clad on the surface of the exposed portion of the guide knife body 9 to improve the wear resistance of the exposed portion of the guide knife body 9.

[0025] The working process of this utility model is as follows:

[0026] The utility model discloses a new replaceable forerunner inlaid with flake diamonds, in which an intermediate alloy 4 and a main alloy 3 are inlaid at the cutting part of the top of the forerunner body 9, diamonds 2 are inlaid on the outside of the main alloy 3, and a protective alloy 1 is arranged on the outermost side. The protective alloy 1 can effectively protect the diamond 2 when breaking the tunnel door, avoid changing the knife, and provide protection for subsequent long-distance excavation. In addition, since the alloy has a higher hardness and a larger wear reserve, and a tungsten carbide particle wear-resistant layer 8 is welded on the surface of the forerunner body 9, the wear resistance of the entire forerunner is guaranteed, especially in abrasive strata such as soft soil, soft sand and fully weathered rock strata, long-distance excavation can be achieved, the tool life is increased, the number of knife changes is reduced, the excavation distance is extended, and the excavation efficiency is improved.

[0027] The above description is only an application implementation method of the present utility model, but the protection scope of the present utility model is not limited to this, and the scope of rights of the present utility model cannot be limited by this. Any equivalent changes made according to the technical solution of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A new replaceable pilot cutter inlaid with sheet diamonds, comprising a pilot cutter body, characterized by: Wear-resistant alloy is inlaid in the cutting part of the top of the leading knife body, and sheet diamonds consistent with the cutting edge are inlaid on the outside of the cutting part of the top of the leading knife body. Protective alloys are provided on the outside of the diamonds, and the height of the protective alloys is not less than the height of the diamonds.

2. The new replaceable guide knife inlaid with sheet diamond according to claim 1 is characterized by: The wear-resistant alloy comprises an intermediate alloy embedded in the middle of the cutting part of the top of the leading cutter body and main alloys embedded at intervals on the outside of the intermediate alloy.

3. The novel replaceable guide cutter inlaid with sheet diamond according to claim 1 or 2, characterized in that: The top and both side slopes of the leading knife body are sharp structures with the middle being higher and the sides being lower.

4. The new replaceable guide cutter inlaid with sheet diamond according to claim 3 is characterized by: Side alloy III, side alloy II and side alloy I are inlaid in sequence from inside to outside on the inclined surfaces on both sides of the leading knife body.

5. The new replaceable guide cutter inlaid with sheet diamonds according to claim 3 is characterized by: A wear-resistant layer containing tungsten carbide particles is clad on the surface of the exposed portion of the leading knife body.

6. The novel replaceable guide cutter inlaid with sheet diamond according to claim 3 is characterized by: The materials of the main alloy and the intermediate alloy are both KE12.

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