A wear-resistant stud

Abstract

The application relates to a wear-resistant stud, which comprises a stud body, an arc-leading ball arranged at the lower end of the stud body, a counterbore arranged at the upper end of the stud body, and a wear-resistant body arranged in the counterbore. The wear-resistant body comprises a cylindrical part, a first tapered part and a second tapered part arranged in sequence from bottom to top. The taper of the first tapered part is less than or equal to the taper of the second tapered part. The application can disperse the material impact stress along the inclined surfaces with two different tapers, so as to avoid stress concentration on the top or the middle.

Description

Technical Field

[0001] This utility model relates to the field of surface strengthening technology for mechanical parts, and in particular to a wear-resistant nail. Background Technology

[0002] In crushing and grinding equipment, wear-resistant nails (piston nails) are core wear-resistant components, and their structural design and performance directly affect the operating efficiency and service life of the equipment.

[0003] Existing wear-resistant studs employ a single cylindrical structure, but they suffer from the following significant drawbacks in practical applications: The surface of the existing cylindrical studs is a smooth, curved cylindrical surface. When in contact with materials, impact stress concentrates at the top and middle of the stud, easily leading to excessive localized wear (such as the top becoming flattened and deep grooves appearing in the middle), while other areas wear slowly, limiting the overall lifespan to localized failures. Furthermore, when existing wear-resistant studs are used in crushing equipment plates with stud welding, an external arc-starting device is required for positioning and welding during installation, making the process cumbersome. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a wear-resistant nail.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a wear-resistant nail, including a nail body, an arc-guiding ball at the lower end of the nail body, a countersunk hole at the upper end, a wear-resistant body inside the countersunk hole, and the wear-resistant body including a cylindrical part, a first conical part and a second conical part arranged sequentially from bottom to top, wherein the taper of the first conical part is less than or equal to the taper of the second conical part.

[0006] As a preferred embodiment, the lower end of the nail body is provided with a groove, and the arc-inducing ball is disposed in the groove. The arc-inducing ball is interference-fitted with the groove, and the arc-inducing ball protrudes from the groove.

[0007] As a preferred embodiment, the lower end of the nail body is provided with a third conical part and a fourth conical part from top to bottom, the taper of the third conical part is smaller than the taper of the fourth conical part, and the groove is provided at the lower end of the fourth conical part.

[0008] As a preferred embodiment, the nail body is made of high-strength alloy steel.

[0009] As a preferred embodiment, the wear-resistant body is made of cemented carbide.

[0010] As a preferred embodiment, the wear-resistant body and the nail body are connected by brazing.

[0011] As a preferred embodiment, a protective sleeve is provided on the outside of the nail body, the height of the protective sleeve is lower than the height of the nail body, and the lower end of the protective sleeve is provided with serrations.

[0012] As a preferred embodiment, the protective sleeve has a stepped outer surface and is made of insulating ceramic material.

[0013] As a preferred embodiment, the arc-initiating ball is made of aluminum.

[0014] As a preferred embodiment, the diameter of the arc-inducing ball is 3-6 mm.

[0015] The beneficial effects of this application are as follows: 1. This application, by setting a wear-resistant body, adopts a composite structure of a cylindrical part + a first conical part + a second conical part, and the taper of the first conical part is smaller than that of the second conical part. Compared with the existing single cylindrical structure, this structure can disperse the impact stress of the material along the inclined surfaces with two different tapers, avoiding stress concentration at the top or middle. Furthermore, the large taper of the second conical part can quickly disperse the vertical impact force of the material, while the small taper of the first conical part further refines the stress distribution and reduces localized excessive wear.

[0016] 2. The two tapered sections with different tapers form a stepped transition, so that when the material comes into contact with the wear-resistant body, it is first initially crushed and guided by the second tapered section, and then further processed by the first tapered section. This extends the contact path between the material and the wear-resistant body, making the wear more evenly distributed across the entire surface of the wear-resistant body, and avoiding the defects of the existing cylindrical structure with the top worn flat and the middle groove.

[0017] 3. This application simplifies the positioning welding process and improves installation efficiency by incorporating an arc-starting ball, allowing direct contact between the ball and the plate during welding. In stud welding, the arc-starting ball, acting as a built-in arc-starting point, can quickly form an arc, reducing the time cost of finding the arc-starting position in traditional welding.

[0018] 4. The wear-resistant body and the nail body are connected by brazing. The wear-resistant body is made of cemented carbide, and the nail body is made of high-strength alloy steel, forming a composite structure of cemented carbide wear-resistant layer + alloy steel tough matrix. This not only improves the overall wear resistance, but also ensures the bonding strength through brazing, preventing the wear-resistant body from falling off during use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 yes Figure 1 Sectional view of AA.

[0021] Figure 3 This is a schematic diagram of the structure of the protective sleeve in this utility model.

[0022] Figure 4 yes Figure 3 BB section view.

[0023] Diagram markings: 1. Nail body, 11. Third conical part, 12. Fourth conical part, 13. Countersunk hole, 2. Arc-drawing ball, 3. Wear-resistant body, 31. Cylindrical part, 32. First conical part, 33. Second conical part, 4. Protective sleeve, 41. Serration. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Please see Figure 1-4 This utility model provides a wear-resistant nail, including a nail body 1, an arc-guiding ball 2 at the lower end of the nail body 1, and a countersunk hole 13 at the upper end. A wear-resistant body 3 is provided in the countersunk hole 13. The wear-resistant body 3 includes a cylindrical part 31, a first conical part 32 and a second conical part 33 arranged sequentially from bottom to top. The taper of the first conical part 32 is smaller than the taper of the second conical part 33.

[0026] The nail body 1 has an outer diameter of 10-30mm, a height of 8-25mm, and an inner diameter of 8-27mm and a depth of 4-20mm for the countersunk hole 13. The cylindrical part 31 has a diameter of 8-27mm, the first conical part 32 is shaped like a frustum of a cone, and the second conical part 33 is shaped like a cone. The top of the second conical part 33 is rounded with a radius of 1-10mm. The taper of the first conical part 32 is 25°-30°, and the taper of the second conical part 33 is 35°-75°.

[0027] Specifically, the lower end of the nail body 1 has a groove, and the arc-inducing ball 2 is disposed in the groove. The arc-inducing ball 2 is interference-fitted with the groove, and the arc-inducing ball 2 protrudes from the groove. The arc-inducing ball 2 is made of aluminum. The diameter of the arc-inducing ball 2 is 3-6mm.

[0028] The lower end of the nail body 1 is provided with a third conical part 11 and a fourth conical part 12 from top to bottom. The taper of the third conical part 11 is smaller than that of the fourth conical part 12. A groove is provided at the lower end of the fourth conical part 12. The taper of the third conical part 11 is 15°-20°, and the taper of the fourth conical part 12 is 25°-45°.

[0029] The nail body 1 is made of high-strength alloy steel. For example, the nail body 1 is made of alloy steel with a C content of 0.05%-0.6%, and the hardness of the nail body 1 is HB120-HB550. The wear-resistant body 3 is made of cemented carbide. For example, the material is WC-Co cemented carbide, in which the Co content is 6%-18%, and the hardness of the wear-resistant body 3 is HRA81-93.

[0030] The wear-resistant body 3 and the nail body 1 are connected by brazing. The gap between the nail body 1 and the inner wall of the wear-resistant body 3 is 0.1-0.3mm. The brazing between the nail body 1 and the inner wall of the wear-resistant body 3 is done with copper-based solder, and the copper content in the copper-based solder is 50%-85%.

[0031] In addition, a protective sleeve 4 is fitted over the outside of the nail body 1. The height of the protective sleeve 4 is 3-10 mm lower than the height of the nail body 1, and the lower end of the protective sleeve 4 has serrations 41. The protective sleeve 4 has a stepped outer shape and is made of insulating ceramic material. The maximum outer diameter of the protective sleeve 4 is 20-40 mm, the difference between the inner diameter of the protective sleeve 4 and the outer diameter of the nail body 1 is 0.5-1 mm, the opening angle of the serrations 41 is 20°-60°, and the height of the serrations 41 is 1-3 mm.

[0032] When using this application, clean the surface of the equipment plate to be welded, removing rust and oil stains to expose the metallic luster. Place the protective sleeve 4 on the outside of the nail body 1, ensuring the serrations 41 are in contact with the surface to be welded, and that the wear-resistant body 3 faces upwards. Then, weld the nail body 1 to the plate surface using stud welding. Next, weld multiple wear-resistant nails in an array. After the array welding of multiple wear-resistant nails, a wear-resistant layer is formed. When materials impact or rub, the wear-resistant body can disperse the impact stress along two inclined planes with different tapers, preventing stress concentration at the top or middle. It should be noted that the outer wall of the countersunk hole 13 forms a ring-shaped structure. Because the ring-shaped structure is relatively thin, after a period of initial material impact or friction, this ring-shaped structure will wear away until the wear-resistant body 3 is completely exposed.

[0033] Of course, this utility model is not limited to the embodiments described above. Several other embodiments based on the design concept of this utility model are also provided below.

[0034] For example, in other embodiments, unlike the embodiments described above, the first conical portion 32 and the second conical portion 33 have equal tapers, both ranging from 15° to 35°. The first conical portion 32 and the second conical portion 33 together form a conical portion. The wear-resistant body 3 exhibits a sudden change in angle from the cylindrical portion 31 to the conical portion. This sudden change alters the impact direction of the material upon contact with the conical portion, dispersing stress. The conical structure expands the material contact area from a single top and middle section to the entire conical surface, resulting in a more uniform wear distribution. For example, when the material impacts the second conical portion 33, stress can be transmitted through the conical surface to the first conical portion 32 and the cylindrical portion 31, preventing excessive localized wear.

[0035] For example, in other embodiments, unlike the embodiments described above, the first tapered portion 32 and the second tapered portion 33 have the same taper, and the taper is 15°-35°. The first tapered portion 32 and the second tapered portion 33 together form a tapered portion, and the generatrix of the tapered portion is arc-shaped, with the concave surface of the generatrix of the tapered portion facing inward.

[0036] It should be noted that the above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A wear-resistant nail, comprising a nail body (1), characterized in that, The nail body (1) has an arc-inducing ball (2) at the lower end and a countersunk hole (13) at the upper end. The countersunk hole (13) contains a wear-resistant body (3). The wear-resistant body (3) includes a cylindrical part (31), a first conical part (32) and a second conical part (33) arranged sequentially from bottom to top. The taper of the first conical part (32) is less than or equal to the taper of the second conical part (33).

2. The wear-resistant nail according to claim 1, characterized in that, The nail body (1) has a groove at its lower end, and the arc-inducing ball (2) is set in the groove. The arc-inducing ball (2) is interference-fitted with the groove, and the arc-inducing ball (2) protrudes out of the groove.

3. The wear-resistant nail according to claim 1, characterized in that, The nail body (1) has a third conical part (11) and a fourth conical part (12) arranged from top to bottom at its lower end. The taper of the third conical part (11) is smaller than that of the fourth conical part (12), and the groove is provided at the lower end of the fourth conical part (12).

4. The wear-resistant nail according to claim 1, characterized in that, The nail body (1) is made of high-strength alloy steel.

5. The wear-resistant nail according to claim 1, characterized in that, The wear-resistant body (3) is made of cemented carbide.

6. The wear-resistant nail according to claim 1, characterized in that, The wear-resistant body (3) and the nail body (1) are connected by brazing.

7. The wear-resistant nail according to claim 1, characterized in that, The nail body (1) is provided with a protective sleeve (4) on the outside. The height of the protective sleeve (4) is lower than the height of the nail body (1). The lower end of the protective sleeve (4) is provided with serrations (41).

8. The wear-resistant nail according to claim 7, characterized in that, The protective sleeve (4) has a stepped shape on the outside and is made of insulating ceramic material.

9. The wear-resistant nail according to claim 1, characterized in that, The arc-inducing ball (2) is made of aluminum.

10. A wear-resistant nail according to claim 1, characterized in that, The diameter of the arc-inducing ball (2) is 3-6 mm.

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