Corrosion-resistant mining cutting pick for mining machinery cutting

Abstract

The utility model discloses a corrosion-resistant mining cutting pick for mining machinery cutting, which belongs to the technical field of coal mining and comprises a pick handle and a pick head detachably mounted in the pick handle. The tooth head comprises a tooth top part arranged at the head end of the tooth head, a tooth body part arranged in the middle of the tooth head and a connecting part arranged at the tail end of the tooth head. Tooth tip reinforcing protrusions protruding out of the surface of the tooth tip part are evenly arranged on the surface of the tooth tip part, and the tooth tip part will preferentially abrade the tooth tip reinforcing protrusions in the using process. Tooth body reinforcing protrusions protruding out of the surface of the tooth body part are evenly arranged on the surface of the tooth body part, and the tooth body reinforcing protrusions are abraded preferentially when the tooth body part is used. According to the corrosion-resistant mining cutting pick, the reinforcing protrusions are arranged on the surface of the worn pick head, and the reinforcing protrusions are preferentially worn when the corrosion-resistant mining cutting pick is used, so that abrasion or damage to an anti-corrosion layer on the surface of the pick head can be reduced, the abrasion resistance of the pick head can be improved, and the overall service life of the corrosion-resistant mining cutting pick is further prolonged.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, specifically to a corrosion-resistant cutting pick for mining machinery. Background Technology

[0002] Cutting teeth are core components of mining machinery such as coal mining machines and tunneling machines, primarily used for cutting coal and rock strata. Traditional cutting teeth typically use cemented carbide (such as WC-Co) for the tooth tip and steel (such as 42CrMo) for the shank, connected by brazing or interference fit. However, in complex mining environments such as coal mines and metal mines, cutting teeth are constantly exposed to humid air, sulfurous gas, and acidic mine water (such as H2 produced by the hydrolysis of sulfate). + In corrosive media such as mineral dust, the outermost anti-corrosion layer (nickel plating, zinc plating, etc.) of the tooth tip is worn first during use, which greatly reduces its corrosion resistance and shortens its service life. Utility Model Content

[0003] The first technical problem this invention aims to solve is to provide a corrosion-resistant cutting tooth for mining machinery that improves the wear resistance of the anti-corrosion coating.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A corrosion-resistant cutting pick for mining machinery includes a shank and a tooth head that is detachably installed in the shank.

[0006] The tooth is a single tooth, which includes a tooth tip at its head, a tooth body in its middle section, and a connecting part at its tail.

[0007] The surface of the tooth tip is uniformly provided with tooth tip reinforcing protrusions that protrude from its surface. During use, the tooth tip will wear down the tooth tip reinforcing protrusions first.

[0008] The surface of the tooth body is uniformly provided with tooth body reinforcing protrusions that protrude from its surface. During use, the tooth body will wear down the tooth body reinforcing protrusions first.

[0009] By adopting the above solution, the corrosion-resistant mining cutting tooth has a reinforcing protrusion on the worn tooth surface. During use, the reinforcing protrusion is worn down first. This not only reduces the wear or damage to the anti-corrosion layer on the tooth surface, but also improves the wear resistance of the tooth and extends its overall service life.

[0010] In a preferred embodiment of a corrosion-resistant cutting tool for mining machinery, in order to improve the wear resistance and corrosion resistance of the tooth tip reinforcement protrusion, the tooth tip reinforcement protrusion is designed as a double-gradient composite material structure, which consists of a cemented carbide base layer (such as WC-6Co) and a surface ceramic coating (such as nano-Al2O3-TiC composite coating) from the inside to the outside.

[0011] In a preferred embodiment of a corrosion-resistant mining cutting tooth, in order to ensure the uniformity of the distribution of the tooth tip reinforcement protrusions, the tooth tip reinforcement protrusions are distributed in a circumferential array along the tooth tip portion, so that the tooth tip reinforcement protrusions can cover every position of the tooth tip portion.

[0012] In a preferred embodiment of a corrosion-resistant cutting tool for mining machinery, in order to improve the wear resistance and corrosion resistance of the reinforcing protrusions on the tooth body, the reinforcing protrusions on the tooth body are made of a wear-resistant and corrosion-resistant composite material structure, which consists of a cemented carbide base layer (such as WC-6Co) and a surface ceramic coating (such as nano-Al2O3-TiC composite coating) from the inside to the outside.

[0013] In a preferred embodiment of a corrosion-resistant mining cutting tooth, in order to ensure the uniformity of the distribution of the reinforcing protrusions on the tooth body, the reinforcing protrusions are distributed in an axial circumferential array along the tooth body, so that the reinforcing protrusions can cover every position of the tooth body.

[0014] In a preferred embodiment of a corrosion-resistant mining cutting tooth, in order to facilitate the disassembly and assembly of the tooth head, multiple concave limiting grooves are also provided on the surface of the tooth body. The concave limiting grooves are clamped with tools such as jigs, making it easier to disassemble and assemble the tooth head with the help of force, which is more labor-saving when disassembling and assembling the tooth head.

[0015] In a preferred embodiment of a corrosion-resistant mining cutting tooth, the connecting part is fully installed inside the tooth shank via threads to facilitate tooth connection, making disassembly and assembly more convenient.

[0016] The second technical problem to be solved by this utility model is to provide a more durable and corrosion-resistant cutting tooth for mining machinery.

[0017] To achieve the above objectives, the present invention adopts the following technical solution:

[0018] Based on the above scheme, the tooth head is designed as a double tooth head, which is composed of two single tooth heads symmetrically joined together. Once one of the single tooth heads becomes unusable due to excessive wear, it can be disassembled and replaced with the other single tooth head. This greatly improves the utilization rate and durability of the tooth head and extends its service life many times over.

[0019] In a preferred embodiment of a corrosion-resistant cutting pick for mining machinery, in order to improve the rigidity, wear resistance and corrosion resistance of the pick, the entire pick, except for the tooth tip reinforcing protrusion and the tooth body reinforcing protrusion, is a three-gradient composite material structure, consisting of a cemented carbide base layer (such as WC-6Co), a transition layer (such as tungsten carbide-cobalt-rare earth modified alloy), and a surface ceramic coating (such as nano Al2O3-TiC composite coating) from the inside out.

[0020] In a preferred embodiment of a corrosion-resistant mining cutting tooth, in order to improve the rigidity, wear resistance and corrosion resistance of the tooth shank, the tooth shank is made of duplex stainless steel substrate (such as 2205 duplex steel) and surface nitriding layer structure (thickened and hardened).

[0021] The beneficial effects of this utility model are:

[0022] 1. The corrosion-resistant mining cutting tooth has a reinforcing protrusion on the worn tooth surface. During use, the reinforcing protrusion is worn down first. This not only reduces the wear or damage to the anti-corrosion layer on the tooth surface, but also improves the wear resistance of the tooth and extends its overall service life.

[0023] 2. The tooth head is designed as a double tooth head, which is composed of two single tooth heads symmetrically assembled. Once one of the single tooth heads becomes unusable due to excessive wear, it can be disassembled and replaced with the other single tooth head. This greatly improves the utilization rate and durability of the tooth head and extends its service life many times over. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A three-dimensional structural diagram of a corrosion-resistant mining cutting pick;

[0026] Figure 2 This is a three-dimensional structural diagram of the toothed shank;

[0027] Figure 3 This is a three-dimensional structural diagram of the single tooth head in Example 1;

[0028] Figure 4 This is a front view of the single-tooth head in Embodiment 1;

[0029] Figure 5 This is a three-dimensional structural diagram of the double-tooth head in Example 2;

[0030] Markings in the diagram: 1-tooth shank; 2-tooth head; 3-tooth tip; 4-tooth body; 5-connecting part; 6-tooth tip reinforcing protrusion; 7-tooth body reinforcing protrusion; 8-inner concave limiting groove. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1, as Figures 1 to 4 As shown, a corrosion-resistant cutting pick for mining machinery is provided, which is used in a tunneling machine. Specifically, it includes a shank 1 and a tooth head 2 detachably installed within the shank 1. The tooth head 2 is a single tooth head, comprising a tooth tip portion 3 at its leading end, a tooth body portion 4 in its middle section, and a connecting portion 5 at its trailing end. The surface of the tooth tip portion 3 is uniformly provided with tooth tip reinforcing protrusions 6, which are preferentially worn during use. The surface of the tooth body portion 4 is uniformly provided with tooth body reinforcing protrusions 7, which are preferentially worn during use. This corrosion-resistant cutting pick for mining machinery, by providing reinforcing protrusions on the worn surface of the tooth head 2, ensures that these reinforcing protrusions are preferentially worn during use. This not only reduces wear or damage to the anti-corrosion layer on the surface of the tooth head 2 but also improves the wear resistance of the tooth head 2, thereby extending its overall service life.

[0033] To improve the wear resistance and corrosion resistance of the tooth tip reinforcing protrusion 6, the tooth tip reinforcing protrusion 6 is designed as a dual-gradient composite material structure, which consists of a cemented carbide base layer and a surface ceramic coating from the inside to the outside. Specifically, the cemented carbide base layer is WC-6Co (mass ratio), and the surface ceramic coating is a nano-Al2O3-TiC composite coating with a mass ratio of 7:3 and a thickness of 0.8-1.2 mm.

[0034] like Figures 3 to 4 As shown, in order to ensure the uniformity of the distribution of the tooth tip reinforcing protrusions 6, the tooth tip reinforcing protrusions 6 are distributed in a circumferential array along the tooth tip portion 3. Figure 3 There are six tooth tip reinforcing protrusions 6 in total, so that the tooth tip reinforcing protrusions 6 can cover every position of the tooth tip portion 3.

[0035] To improve the wear resistance and corrosion resistance of the tooth body reinforcing protrusion 7, the tooth body reinforcing protrusion 7 is a wear-resistant and corrosion-resistant composite material structure, which consists of a cemented carbide base layer and a surface ceramic coating from the inside to the outside. The cemented carbide base layer is WC-6Co (by mass), and the surface ceramic coating is a nano-Al2O3-TiC composite coating with a mass ratio of 7:3 and a thickness of 0.8-1.2 mm.

[0036] Continue as Figures 3 to 4 As shown, in order to ensure the uniformity of the distribution of the tooth body reinforcing protrusions 7, the tooth body reinforcing protrusions 7 are distributed in an axial circumferential array along the tooth body portion 4. Figure 3 There are four tooth body reinforcing protrusions 7, which can cover every position of the tooth body portion 4.

[0037] Continue as Figures 3 to 4 As shown, in order to facilitate the disassembly and assembly of the tooth head 2, multiple concave limiting grooves 8 are also provided on the surface of the tooth body 4 in a circumferential array. The concave limiting grooves 8 are clamped with tools such as jigs, making it easier to disassemble and assemble the tooth head 2 with the help of force, which is more labor-saving when disassembling and assembling the tooth head 2.

[0038] Continue as Figures 3 to 4 As shown, in order to connect the tooth head 2, the connecting part 5 is fully installed in the tooth shank 1 by thread. Of course, other means (such as snap-fit) can also be used for connection, which is more convenient for disassembly and assembly.

[0039] Example 2 differs from Example 1 only in that, based on Example 1, the tooth 2 is replaced with a double tooth instead of a single tooth. The double tooth is composed of two symmetrically joined single teeth. If one single tooth becomes unusable due to excessive wear, it can be disassembled and replaced with the other single tooth. This greatly improves the utilization rate and durability of the tooth 2, and extends its service life many times over.

[0040] To enhance the rigidity, wear resistance, and corrosion resistance of the tooth tip 2, the entire tooth tip 2, except for the tooth tip reinforcing protrusion 6 and the tooth body reinforcing protrusion 7, is a three-gradient composite material structure. From the inside out, it consists of a cemented carbide base layer, a transition layer, and a surface ceramic coating. Specifically, the cemented carbide base layer is WC-6Co (mass ratio), the transition layer is a tungsten carbide-cobalt-rare earth modified alloy with the following composition: WC: 55-65wt%, Co: 25-30wt%, La2O3: 3-5wt%, Cr3C2: 2-4wt%, and the surface ceramic coating is a nano-Al2O3-TiC composite coating with a mass ratio of 7:3 and a thickness of 0.8-1.2mm.

[0041] To improve the rigidity, wear resistance and corrosion resistance of the tooth shank 1, the tooth shank 1 is made of duplex stainless steel substrate and surface nitriding layer structure; wherein, the duplex stainless steel substrate is 2205 duplex steel, the surface nitriding layer is 5-10μm thick and has a hardness of HV 800-1000.

[0042] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A corrosion-resistant cutting pick for mining machinery, comprising a shank and a tooth head detachably installed in the shank; Its features are: The tooth is a single tooth, which includes a tooth tip at its head, a tooth body in its middle section, and a connecting part at its tail. The surface of the tooth tip portion is uniformly provided with tooth tip reinforcing protrusions that protrude from its surface. During use, the tooth tip portion will wear down the tooth tip reinforcing protrusions first. The surface of the tooth body is uniformly provided with tooth body reinforcing protrusions that protrude from its surface. During use, the tooth body will wear down the tooth body reinforcing protrusions first.

2. The corrosion-resistant cutting pick for mining machinery according to claim 1, characterized in that, The tooth tip reinforcing protrusion has a dual-gradient composite material structure, consisting of a cemented carbide base layer and a surface ceramic coating from the inside out.

3. The corrosion-resistant cutting pick for mining machinery according to claim 2, characterized in that, The tooth tip reinforcement protrusions are distributed in a circumferential array along the tooth tip portion.

4. The corrosion-resistant mining cutting pick according to claim 1, characterized in that, The tooth body reinforcing protrusion is a wear-resistant and corrosion-resistant composite material structure, consisting of a cemented carbide base layer and a surface ceramic coating from the inside out.

5. The corrosion-resistant mining cutting pick according to claim 4, characterized in that, The tooth body reinforcing protrusions are distributed in an axial circumferential array along the tooth body portion.

6. The corrosion-resistant cutting pick for mining machinery according to claim 1, characterized in that: The surface of the tooth body also has multiple circumferentially distributed concave limiting grooves.

7. The corrosion-resistant cutting pick for mining machinery according to claim 1, characterized in that: The connecting part is fully installed inside the toothed shank by threads.

8. The corrosion-resistant mining cutting pick according to claim 1, characterized in that, The tooth can also be a double tooth, which is formed by symmetrically joining two single teeth.

9. The corrosion-resistant cutting pick for mining machinery according to any one of claims 1-8, characterized in that, Except for the tooth tip reinforcement protrusion and the tooth body reinforcement protrusion, the entire tooth head is a three-gradient composite material structure, consisting of a cemented carbide base layer, a transition layer, and a surface ceramic coating from the inside out.

10. The corrosion-resistant cutting pick for mining machinery according to any one of claims 1-8, characterized in that, The toothed shank is composed of a duplex stainless steel substrate and a nitrided surface layer.

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