Wear-resistant diamond cutter for shield sand layer

Abstract

The utility model belongs to the technical field of diamond cutters, and discloses a wear-resistant diamond cutter for a shield sand layer, which is a replaceable tearing cutter inlaid with diamond compacts and is divided into three main parts, namely a cutter body, a cutter head alloy and a diamond, silver brazing is adopted between the cutter head alloy and the cutter body, all welding beads are fully welded, and the welding strength is greater than or equal to 245MPa; the diameter of the diamond cylinder is 18 mm, and the diameter of the diamond cylinder is 8 mm. The diamond cylinder is in interference fit with the cutter body and is extruded into the cutter body. The cutter body is made of 42crmo alloy steel, a forging process is adopted, the 42crmo alloy steel is forged into the original shape of the cutter body, and then heat treatment is carried out, so that the toughness of a conductor is improved. The alloy of the tool bit is selected from the spring probake13 alloy, and the wear resistance and the impact toughness are both considered. Wear-resistant layers with the thickness of 3-5mm are overlaid on the surface of the cutter body and the periphery of the mounting hole. According to the utility model, the strength and the wear resistance of the cutter are improved, the impact force on the cutter head is reduced, the service life of the cutter is prolonged, the replacement frequency of the cutter is reduced, the tunneling cost is reduced, and the construction production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of diamond cutters, in particular to a wear-resistant diamond cutter for shield sand layers. Background Art

[0002] The existing cutters used for shield sand layers have poor wear resistance, are easily damaged, cannot meet construction needs and have high cost of use.

[0003] Through the above analysis, the problems and defects of the existing technology are as follows: the existing cutters used for shield sand layers have poor wear resistance, are easily damaged, cannot meet construction needs and have high cost of use. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a wear-resistant diamond cutter for shield sand layers.

[0005] The utility model is implemented as follows: a wear-resistant diamond tool for shield sand layers is a replaceable tearing tool inlaid with a diamond composite sheet, which is divided into three main parts: a tool body, a tool head alloy, and a diamond. Silver brazing is adopted between the tool head alloy and the tool body, and all welds are fully welded, and the welding strength is ≥245MPa; the diamond cylinder is selected in two specifications of diameter 18mm and diameter 8mm, and is squeezed into the tool body by an interference fit with the tool body.

[0006] Furthermore, the blade body is made of 42crmo alloy steel, which is forged into its original shape by a forging process, and then heat treated to increase the toughness of the conductor.

[0007] Furthermore, the blade alloy is made of Chunbao ke13 alloy, which takes into account both wear resistance and impact toughness.

[0008] Furthermore, a wear-resistant layer is built-up on the surface of the cutter body and the periphery of the mounting hole, with a thickness of 3-5 mm.

[0009] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the utility model are as follows:

[0010] First, in view of the technical problems existing in the above-mentioned prior art and the difficulty of solving the problems, the technical solutions to be protected by the utility model and the results and data in the research and development process are closely combined to analyze in detail and deeply how the technical solutions of the utility model solve the technical problems and some creative technical effects brought about after solving the problems. The specific description is as follows:

[0011] The utility model increases the strength and wear resistance of the cutter, reduces the impact force on the cutter head, prolongs the service life of the cutter, reduces the number of times the cutter is replaced, reduces the excavation cost, and improves the construction production efficiency.

[0012] Second, in the shield sand layer wear-resistant diamond tool provided by the utility model, significant technical progress can be reflected in several aspects:

[0013] 1. Material selection and optimization:

[0014] The use of 42CrMo alloy steel provides a foundation of high strength and toughness for the cutter body.

[0015] The application of Chunbao KE13 alloy in the cutter head provides excellent wear resistance and impact toughness.

[0016] The use of diamonds greatly improves the wear resistance and service life of the cutting part, especially in highly abrasive formations such as sand layers.

[0017] 2. Innovation in structural design:

[0018] The interference fit design of the diamond cylinder enhances the bonding strength between the diamond and the cutter body and improves the stability of the diamond during operation.

[0019] The wear-resistant layer (3-5 mm) on the surface of the cutter body and the periphery of the mounting hole further enhances the durability and adaptability of the cutter.

[0020] 3. Improvement of welding technology:

[0021] The use of silver brazing technology to connect the cutter head alloy and the cutter body not only improves the reliability of welding, but also increases the welding strength to 245MPa, which ensures structural safety under high load and complex geological conditions.

[0022] 4. Improvement of manufacturing technology:

[0023] Through process steps such as forging and heat treatment, it is possible to ensure that the original shape of the knife body has the required mechanical properties, thus improving the overall performance of the product.

[0024] 5. Improvement of work efficiency and cost-effectiveness:

[0025] The design and material usage of this diamond tool improve the working efficiency of the tool, reduce the replacement frequency, and reduce the time of work interruption, thereby improving the overall economic benefits of shield tunneling.

[0026] 6. Durability and adaptability:

[0027] The cutters are able to adapt to more complex and varied geological conditions, such as sand layers containing larger rocks, which allows the shield machine to be used in a wider range of working conditions and reduces the need for different types of cutters.

[0028] These technological advances not only improve the performance of shield machines in tunnel excavation, but also help reduce equipment maintenance costs and extend equipment life. They are important technological contributions to the field of tunnel and underground engineering construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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 embodiments of the utility model. 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 creative work.

[0030] Figure 1 It is a front view of a wear-resistant diamond tool for shield sand layer provided by an embodiment of the utility model;

[0031] Figure 2 This is a left view of a wear-resistant diamond tool for shield sand layer provided by an embodiment of the utility model;

[0032] Figure 3 It is a top view of a wear-resistant diamond cutter for shield sand layers provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0034] In view of the problems existing in the prior art, the utility model provides a wear-resistant diamond cutter for shield sand layers. The utility model is described in detail below in conjunction with the accompanying drawings.

[0035] The following are two specific embodiments of the present invention regarding the wear-resistant diamond tool for shield sand layer:

[0036] Example 1

[0037] In the embodiment of tunnel boring by a shield machine, it is assumed that the geological conditions mainly consist of medium-hard sand layers.

[0038] 1. Tool material and processing:

[0039] The blade body is made of 42CrMo alloy steel. After forging into its original shape, it is subjected to high-temperature heat treatment to improve hardness and toughness.

[0040] The blade alloy is made of Chunbao KE13 alloy to ensure wear resistance and impact toughness.

[0041] A 3mm thick wear-resistant layer is welded on the surface of the cutter body and the periphery of the mounting hole.

[0042] 2. Diamond configuration:

[0043] Select a diamond cylinder with a diameter of 18 mm and squeeze and fix the diamond on the cutter body through interference fit.

[0044] 3. Welding technology:

[0045] Silver brazing technology is used to weld the cutter head alloy to the cutter body to ensure that the welding strength reaches more than 245MPa.

[0046] 4. Working principle:

[0047] During the rotation and advancement of the shield machine, the diamond tearing cutter effectively cuts and crushes the sand layer.

[0048] Example 2

[0049] In another embodiment of tunnel boring by a shield machine, it is assumed that the geological conditions consist of a sand layer containing larger stones, which places higher requirements on the wear resistance and impact toughness of the tearing cutter.

[0050] 1. Tool material and processing:

[0051] The cutter body is still made of 42CrMo alloy steel and is processed by forging and heat treatment.

[0052] The blade alloy is made of Chunbao KE13 alloy which is more wear-resistant and has higher impact toughness.

[0053] A 5mm thick wear-resistant layer is welded on the surface of the cutter body and the periphery of the mounting hole to adapt to the sand layer containing larger hard stones.

[0054] 2. Diamond configuration:

[0055] Due to the more severe geological conditions, diamond cylinders with a diameter of 8mm are selected to provide more wear-resistant points, and the diamond cylinders are evenly distributed on the surface of the cutter body through interference fit.

[0056] 3. Welding technology:

[0057] Silver brazing technology is used to ensure the connection strength between the blade alloy and the blade body. The welding strength must not only reach above 245MPa, but also ensure that the weld will not break when encountering impact from large rocks.

[0058] 4. Working principle:

[0059] When the shield machine is excavating a sand layer containing large hard stones, the diamond tearing cutter can withstand greater impact force, and the wear-resistant layer of the cutter body and cutter head can withstand the wear of the stones, thereby maintaining cutting efficiency and extending the life of the cutter.

[0060] In these two embodiments, the key to the design lies in the selection of materials and the design of the structure, both of which are aimed at improving the wear resistance and toughness of the cutter under complex geological conditions, ensuring that the shield machine can perform tunnel excavation operations efficiently and stably.

[0061] Diamond tearing cutter is a key wear-resistant tool used by shield machines in tunnel excavation operations. Especially in abrasive strata such as sand layers, diamond tearing cutters are widely used due to their high wear resistance and good fracture toughness. The following is a detailed description of the working principle and structural characteristics of the diamond tearing cutter:

[0062] 1.Structural composition and characteristics:

[0063] Knife body: As the main body of the tearing knife, the knife body is made of 42CrMo alloy steel, which has excellent mechanical properties and high strength and toughness. The original shape is formed by forging process, and the toughness and hardness are increased by heat treatment to ensure that the shape and function are not damaged even under harsh geological conditions.

[0064] Cutter head alloy: The cutter head alloy is made of Chunbao KE13 alloy, which has excellent performance in wear resistance and impact toughness. It is suitable for use in the cutter head position of the tearing knife and can effectively cut sand layers and other abrasive formations.

[0065] Diamond: Diamond is used as the cutting part of the tearing knife, and diamond cylinders with diameters of 18mm and 8mm are used. Diamond has extremely high hardness and can play an excellent wear-resistant role in highly abrasive formations such as sand layers.

[0066] Silver brazing: The blade alloy and the blade body are firmly connected by silver brazing. All welds are fully welded to ensure the connection strength (≥245MPa). This ensures that the blade alloy will not fall off when the tool is subjected to strong impact and torque.

[0067] Interference fit: An interference fit is adopted between the diamond cylinder and the cutter body, that is, the size of the diamond is slightly larger than the hole in the cutter body. The diamond is pressed into the cutter body through extrusion force, ensuring the fixed stability of the diamond.

[0068] Wear-resistant layer: The surface of the cutter body and the outer periphery of the mounting hole are welded with a wear-resistant layer with a thickness of 3-5mm. This can further improve the wear resistance of the tearing knife under complex geological conditions and extend its service life.

[0069] 2. Working principle:

[0070] During the tunnel excavation process of the shield machine, the tearing cutters are installed on the cutting head. As the shield machine rotates, these tearing cutters come into contact with the strata. Through the rotational force and propulsion force transmitted by the cutter body, the diamond cutter head of the tearing cutter cuts and crushes the strata.

[0071] Due to the extremely high hardness of diamond, it can effectively cut soft formations such as sand layers, while the KE13 alloy provides sufficient toughness to ensure that the cutter head will not be easily damaged when subjected to impact. At the same time, the wear-resistant layer of the cutter body protects the cutter body from wear and extends the service life of the tool.

[0072] In the advancement of the shield machine, the design of this diamond tearing knife enables the shield machine to adapt to more difficult geological conditions, reduce maintenance times and costs, and improve the efficiency of tunnel excavation. Figure 1 to Figure 3 As shown, the wear-resistant diamond tool for shield sand layers provided by the embodiment of the utility model is a replaceable tearing tool inlaid with diamond composite sheets, which is divided into three main parts: a tool body, a tool head alloy, and a diamond. Silver brazing is adopted between the tool head alloy and the tool body, and all welds are fully welded, with a welding strength ≥245MPa; the diamond cylinder is selected in two specifications of diameter 18mm and diameter 8mm, and is squeezed into the tool body by an interference fit.

[0073] The blade body is made of 42crmo alloy steel and is forged into its original shape, and then heat treated to increase the toughness of the conductor.

[0074] The blade alloy is made of Chunbao ke13 alloy, which has both wear resistance and impact toughness.

[0075] The surface of the cutter body and the periphery of the mounting hole are welded with a wear-resistant layer with a thickness of 3-5mm.

[0076] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0077] The above description is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A wear-resistant diamond tool for shield sand layer, It is characterized in that It is a replaceable tearing knife inlaid with diamond composite sheet, which is divided into three main parts: knife body, knife head alloy and diamond. Silver brazing is adopted between knife head alloy and knife body, and all welds are fully welded, with welding strength ≥245MPa. Diamond cylinder is available in two specifications with diameter of 18mm and 8mm, and is squeezed into the knife body by interference fit.

2. The wear-resistant diamond tool for shield sand layer as claimed in claim 1, It is characterized in that The blade body is made of 42crmo alloy steel and is forged into its original shape, and then heat treated to increase the toughness of the conductor.

3. The wear-resistant diamond tool for shield sand layer as claimed in claim 1, It is characterized in that The blade alloy is made of Chunbao ke13 alloy, which has both wear resistance and impact toughness.

4. The wear-resistant diamond tool for shield sand layer according to claim 1, It is characterized in that The surface of the cutter body and the periphery of the mounting hole are welded with a wear-resistant layer with a thickness of 3-5mm.

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