Bimetal wear-resistant bolt and nut assembly

Abstract

The utility model relates to a bimetallic wear-resistant bolt and nut assembly which comprises a bolt and a nut. The bolt comprises a bolt base body and a wear-resistant layer overlaid on the side face of a bolt head. The nut comprises a nut base body and a wear-resistant layer overlaid on the easy-to-wear surface of the nut. The wear-resistant layers are overlaid on the side face of the bolt head and the surface of the nut layer by layer through the overlaying technology, the hardness is HRC45 or above, and the thickness ranges from 0.3 mm to 10 mm. The bolt can be a hexagonal head wear-resisting bolt or a cylindrical head inner hexagonal wear-resisting bolt, and the wear-resisting layer is overlaid on the circumferential side face of the bolt. The wear-resistant layer is reasonably distributed, so that the durability of the bolt and the nut in a high-wear and high-load environment is greatly improved, and the wear-resistant nut is particularly suitable for industrial equipment such as a coal mill and has the advantages of high wear resistance, long service life and wide applicability.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a bimetallic wear-resistant bolt and nut assembly. Background Technology

[0002] Coal mills are crucial equipment in industries such as power generation, metallurgy, and chemicals. Their core components operate under high temperature, high load, and high wear conditions. Fasteners, especially bolts and nuts, are subjected to friction and impact forces over long periods, making them highly susceptible to wear and failure. Fastener failure not only affects the safe operation of the equipment but can also lead to frequent downtime for maintenance, significantly increasing maintenance costs and reducing equipment operating efficiency.

[0003] Current coal mill fasteners are mostly made of a single material, with wear resistance improved through surface heat treatment, coating, or replacement with higher-hardness materials. However, these methods have significant limitations. For example, insufficient adhesion of thermal spraying leads to coating peeling, hardening treatment increases material brittleness, and replacing with higher-hardness materials increases costs and reduces adaptability. Therefore, these existing technical solutions are difficult to meet the long-term requirements of coal mill fasteners for use in high-wear, high-load environments.

[0004] Therefore, there is an urgent need for an improved bolt and nut design that can effectively enhance the wear resistance and service life of fasteners in coal mill equipment, while reducing manufacturing and maintenance costs and adapting to the needs of complex working environments. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a bimetallic wear-resistant bolt and nut assembly. This assembly can significantly improve the wear resistance and service life of fasteners in high-load and high-wear environments. It is particularly suitable for industrial equipment such as coal mills and solves the problems of easy wear failure, short service life and high manufacturing cost of existing bolts and nuts.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a bimetallic wear-resistant bolt and nut assembly, including a bolt and a nut. The bolt includes a bolt base and a wear-resistant layer welded to the side of the bolt head. The nut includes a nut base and a wear-resistant layer welded to the surface of the nut. The wear-resistant layer is welded layer by layer to the side of the bolt head and the surface of the nut through a welding technique, which can withstand high wear and high load usage environments.

[0007] Furthermore, the wear-resistant layer has a hardness of HRC45 or higher and a thickness ranging from 0.3 mm to 10 mm to meet the usage requirements under different working conditions.

[0008] Furthermore, the wear-resistant layer is made of iron-based alloy, nickel-based alloy, cobalt-based alloy, or high-carbon high-chromium alloy, and may be mixed with metal ceramic particles to improve wear resistance.

[0009] Furthermore, the bolt can be a hexagonal head wear-resistant bolt, with the wear-resistant layer welded onto the circumferential side of the bolt head.

[0010] Furthermore, the bolt can be a cylindrical head hexagonal socket head capacitive bolt, with the wear-resistant layer welded onto the circumferential side of the bolt head.

[0011] The beneficial effects of this utility model are:

[0012] This invention significantly improves the durability of fasteners under high load and high wear environments by overlaying wear-resistant layers on the side of the bolt head and the surface of the nut, thus meeting the long-term use requirements of equipment such as coal mills.

[0013] The wear-resistant layer of this invention is welded onto the bolt and nut substrate using a welding overlay technique, which ensures a firm bond between the wear-resistant layer and the substrate, avoiding the problem of coating peeling in traditional spraying processes and significantly improving the service life of the wear-resistant layer.

[0014] The bolts of this utility model are designed as hexagonal head wear-resistant bolts or cylindrical head internal hexagonal wear-resistant bolts, which can meet the assembly requirements under different working conditions and have high application flexibility.

[0015] The nut of this invention effectively reduces frictional wear at the contact point between the nut and the bolt by depositing a wear-resistant layer on the easily worn surface, thus extending the service life of the nut.

[0016] This invention controls the thickness of the wear-resistant layer within the range of 0.3mm to 10mm, allowing for adjustment of the thickness according to the specific usage environment, thereby controlling material costs while ensuring wear resistance.

[0017] The wear-resistant layer of this invention has a hardness of HRC45 or higher, which meets the hardness requirements of wear-resistant parts in high-wear applications and ensures the stable operation of fasteners under harsh working conditions.

[0018] The wear-resistant layer material of this invention can be selected from iron-based alloys, nickel-based alloys, cobalt-based alloys, or high-carbon high-chromium alloys according to requirements, and can be mixed with metal ceramic particles (such as WC, TiC, etc.) to further improve wear resistance and impact resistance. Attached Figure Description

[0019] Figure 1 These are a top view and a sectional view along the AA direction of the hexagonal head wear-resistant bolt of this utility model;

[0020] Figure 2 These are a top view and a sectional view along the AA direction of the cylindrical head internal hexagonal wear-resistant bolt of this utility model.

[0021] Figure 3 These are a top view and a sectional view along the AA direction of the hexagonal head wear-resistant nut of this utility model;

[0022] Figure 4 This is an assembly diagram of the bolt and nut of this utility model;

[0023] In the figure, 1-bolt base; 2-wear-resistant layer; 3-nut base. Detailed Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0025] In one embodiment of this utility model, such as Figure 1 The image shows a hexagonal head bimetallic wear-resistant bolt. The bolt includes a bolt body 1 and a wear-resistant layer 2 welded to the circumferential side of the bolt head. The bolt body is made of a high-strength metal material to withstand the demands of high-load conditions. The wear-resistant layer is welded to the side of the bolt head, with a thickness of 0.3 mm to 10 mm and a hardness of HRC45 or higher. The material of the wear-resistant layer can be an iron-based alloy, a nickel-based alloy, a cobalt-based alloy, or a high-carbon, high-chromium alloy, and may incorporate cermet particles.

[0026] In another embodiment of this utility model, such as Figure 2 The image shows a cylindrical head hexagonal bimetallic wear-resistant bolt. The bolt body 1 features a cylindrical head hexagonal design, with a wear-resistant layer 2 welded to the circumferential side of the head. This wear-resistant layer is firmly welded to the side of the cylindrical head using a welding technique. This design is particularly suitable for scenarios with concentrated stress and limited tightening space. Simultaneously, the cylindrical head structure provides higher tightening torque, significantly improving the bolt's wear resistance and tightening stability.

[0027] like Figure 3 The image shows an example of a nut structure. The nut includes a nut body 1, a wear-resistant layer 2 welded to the outer surface of the nut, and internal threads 3. The nut body is made of a high-strength metal material, and its shape can be designed as hexagonal, circular, or other polygonal shapes according to usage requirements. The wear-resistant layer welded to the outer surface of the nut has a thickness of 0.3 mm to 10 mm and a hardness of HRC45 or higher. By welding a wear-resistant layer onto the surface of the nut, the nut can significantly improve its durability under high-friction and high-load conditions.

[0028] like Figure 4The diagram shows a schematic of the bolt and nut assembly. Both the bolt and nut are fastened by internal and external threads. The bolt includes a bolt body 1 and a wear-resistant layer 2 welded to the side of the head. The nut includes a nut body 1, an outer wear-resistant layer 2, and internal threads 3. The wear-resistant layers of both the bolt and nut are located in areas prone to wear and are securely connected by welding. This design significantly improves the wear resistance of the bolt and nut assembly under harsh working conditions. In another embodiment of this invention, the wear-resistant bolt is directly fixed to the workpiece through a pre-set through hole, eliminating the need for a nut. This embodiment is suitable for working conditions requiring unilateral fixation and complex through-hole environments.

[0029] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A bimetallic wear-resistant bolt and nut assembly, comprising a bolt and a nut, characterized in that: The bolt includes a bolt base and a wear-resistant layer, and the nut includes a nut base and a wear-resistant layer. The wear-resistant layer is deposited layer by layer on the side of the bolt head and the surface of the nut using a welding overlay technique.

2. The bimetallic wear-resistant bolt and nut assembly according to claim 1, characterized in that: The wear-resistant layer has a hardness of HRC45 or higher and a thickness ranging from 0.3 mm to 10 mm.

3. The bimetallic wear-resistant bolt and nut assembly according to claim 1, characterized in that: The bolt can be a hexagonal head wear-resistant bolt, with the wear-resistant layer welded onto the circumferential side of the hexagonal head.

4. The bimetallic wear-resistant bolt and nut assembly according to claim 1, characterized in that: The bolt can be a cylindrical head hexagonal wear-resistant bolt, with the wear-resistant layer welded onto the circumferential side of the cylindrical head.

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