A coal cutter pick with a wear resistant coating and a coal cutter drum

Abstract

The utility model discloses a coal -winning machine picks tooth with wear -resisting coating and coal -winning machine drum, including alloy head, tooth body, wear -resisting ring and wear -resisting protective layer, alloy head connects in one end of tooth body, and the junction of alloy head and tooth body outside fixed wear -resisting ring is provided, and the surface of alloy head, tooth body and wear -resisting ring all covers wear -resisting protective layer. The utility model adopts vacuum plasma physical gas phase deposition, and the integral surface of tooth body, alloy head and wear -resisting ring is covered with one layer of superhard wear -resisting ceramic coating again, and the overall wear resistance of pick tooth is increased significantly, and the service life is improved, and it is not necessary to replace frequently again, and the labor intensity is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of coal mining machine cutting teeth, specifically a coal mining machine cutting tooth with a wear-resistant coating and a coal mining machine drum. Background Technology

[0002] When a coal mining machine is working, the cutting teeth mounted on the drum cut into the coal seam at high speed, gradually separating the coal and rock from the whole. Specifically, after the cutting edge of the cutting tooth contacts the coal and rock, it first cuts off a portion of the coal and rock through shearing action, and then crushes the remaining coal and rock into smaller pieces through compression and friction. As the cutting tooth continues to rotate and advance, these crushed coal and rock particles are continuously cut and broken, thereby achieving the purpose of coal mining. Therefore, the cutting tooth is subjected to high cyclic compressive stress, shear stress, and impact load during operation. Its main failure mode is wear of the alloy cutter head or tooth body. Especially when encountering interbedded rock or thin coal seams, the wear of the cutting tooth is more severe, requiring frequent machine shutdowns to replace the cutting tooth, increasing the labor intensity of workers, reducing production efficiency, and even affecting production safety. Utility Model Content

[0003] The purpose of this invention is to provide a coal mining machine cutting tooth and a coal mining machine drum with a wear-resistant coating to solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A coal mining machine cutting tooth with a wear-resistant coating includes an alloy head, a tooth body, a wear-resistant ring, and a wear-resistant protective layer. The alloy head is connected to one end of the tooth body, and a wear-resistant ring is fixedly installed on the outside of the connection between the alloy head and the tooth body. The surfaces of the alloy head, tooth body, and wear-resistant ring are all covered with a wear-resistant protective layer.

[0005] Furthermore, a wear-resistant ring is laser-clad onto the tooth surface at the alloy head connection point.

[0006] Furthermore, the wear-resistant ring is made of nickel-based carbide.

[0007] Furthermore, the wear-resistant ring has several guide grooves axially arranged on its surface; the wear-resistant ring has a width of 20-30 mm and a thickness of 2-3 mm.

[0008] Furthermore, a wear-resistant protective layer is applied to the surfaces of the gear body, alloy head, and wear-resistant ring using vacuum plasma physical vapor deposition.

[0009] Furthermore, the wear-resistant protective layer is a ceramic coating.

[0010] Furthermore, the ceramic coating is a nitride or carbide coating of transition metals.

[0011] Furthermore, the ceramic coating thickness is 5-15 micrometers.

[0012] Furthermore, the other end of the tooth body is connected to the tooth shank, and the tooth body and tooth shank are integrally formed.

[0013] A coal mining machine drum is equipped with the aforementioned coal mining machine cutting teeth with a wear-resistant coating.

[0014] Compared with the prior art, the present invention has the following technical effects: This invention employs vacuum plasma physical vapor deposition to coat the entire surface of the cutting tooth, alloy head, and wear ring with an ultra-hard wear-resistant ceramic coating, significantly increasing the overall wear resistance of the cutting tooth, extending its service life, eliminating the need for frequent downtime for replacement, reducing labor intensity, and increasing production efficiency.

[0015] Meanwhile, the use of laser cladding to manufacture wear-resistant rings can prevent the alloy head from falling off prematurely and increase the wear resistance of the gear body. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] in: 1. Tooth shank, 2. Tooth body, 3. Alloy head, 4. Wear-resistant ring. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this utility model and simplifying the description. They 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," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Example 1, please refer to Figure 1 This utility model provides a coal mining machine cutting tooth with a wear-resistant coating, including an alloy head 3, a tooth body 2, a wear-resistant ring 4, and a wear-resistant protective layer. The alloy head 3 is connected to one end of the tooth body 2, and the wear-resistant ring 4 is fixedly installed on the outside of the connection between the alloy head 3 and the tooth body 2. The surfaces of the alloy head 3, the tooth body 2, and the wear-resistant ring 4 are all covered with a wear-resistant protective layer.

[0022] To prevent premature detachment of the alloy head and to increase the wear resistance of the tooth body, a wear-resistant ring is manufactured on the tooth body surface near the alloy head connection area using laser cladding. To further enhance the overall wear resistance of the cutting tooth, an ultra-hard wear-resistant ceramic coating is then prepared on the surfaces of the tooth body, alloy head, and wear-resistant ring using vacuum plasma physical vapor deposition (PVD).

[0023] Example 2: This utility model provides a coal mining machine cutting tooth with a wear-resistant coating, including a tooth shank 1, a tooth body 2, an alloy head 3, a wear-resistant ring 4, and an ultra-hard wear-resistant coating covering the tooth body, alloy head, and wear-resistant ring. See [link to example]. Figure 1 As shown.

[0024] The main innovation of this invention is that, to prevent premature detachment of the alloy head and increase the wear resistance of the tooth body, a wear-resistant ring with a width of 20-30 mm and a thickness of 2-3 mm is manufactured on the tooth body surface near the alloy head connection area using laser cladding. To further enhance the overall wear resistance of the cutting tooth, an ultra-hard wear-resistant ceramic coating with a thickness of 5-15 micrometers is further prepared on the surfaces of the tooth body, alloy head, and wear-resistant ring using vacuum plasma physical vapor deposition (PVD).

[0025] The above technical solution effectively solves the wear problem during the operation of the cutting teeth. The preferred ultra-hard wear-resistant ceramic coating composition is a nitride or carbide of a transition metal, with a Vickers hardness greater than HV2000.

[0026] Example 3, see Figure 1This utility model provides a technical solution: a U95-25 coal mining machine cutting tooth, comprising a tooth shank 1, a tooth body 2, an alloy head 3, and a wear-resistant ring 4. To prevent premature detachment of the alloy head 3, a nickel-based carbide wear-resistant ring 4, 20 mm wide and 2 mm thick, is manufactured on the surface of the tooth body 2 attached to the alloy head 3 using laser cladding technology. To increase the overall wear resistance of the cutting tooth, a 6-micron thick ultra-hard wear-resistant ceramic coating is further prepared on the entire surface of the tooth body 2, alloy head 3, and wear-resistant ring 4 using vacuum plasma physical vapor deposition (PVD).

[0027] The above technical solution effectively solves the wear problem during the operation of the cutting teeth. The preferred vacuum plasma physical vapor deposition method for preparing the ultrahard wear-resistant ceramic coating is a chromium-aluminum-nitrogen ceramic coating with a relative atomic content of 25 at% chromium, 40 at% aluminum, and 35 at% nitrogen, and a Vickers hardness of HV3000.

[0028] By adopting the aforementioned technical solution, the U95-25 wear-resistant coated cutting teeth were tested and applied on the MG900 / 2300-WD type double-drum coal mining machine in a coal mine's fully mechanized mining face. Ordinary cutting teeth were installed on the front drum, and wear-resistant coated cutting teeth were installed on the rear drum. During the 28-day test period, a total of 31 wear-resistant coated cutting teeth were consumed, with an average daily consumption of 1.11 teeth; a total of 115 ordinary cutting teeth were consumed, with an average daily consumption of 4.11 teeth. The consumption ratio of wear-resistant coated cutting teeth to ordinary cutting teeth was 1:3.7.

[0029] Example 4: This utility model provides a coal mining machine drum, which is equipped with coal mining machine cutting teeth with wear-resistant coating. When the coal mining machine is working, the coal mining machine cutting teeth with wear-resistant coating installed on the drum cut into the coal seam in a high-speed rotating manner, gradually separating the coal and rock from the whole.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coal mining machine cutting tooth with a wear-resistant coating, characterized in that, It includes an alloy head (3), a tooth body (2), a wear-resistant ring (4) and a wear-resistant protective layer. The alloy head (3) is connected to one end of the tooth body (2). The wear-resistant ring (4) is fixedly installed on the outside of the connection between the alloy head (3) and the tooth body (2). The surfaces of the alloy head (3), the tooth body (2) and the wear-resistant ring (4) are all covered with a wear-resistant protective layer.

2. A coal mining machine cutting tooth with a wear-resistant coating according to claim 1, characterized in that, A wear-resistant ring (4) is set on the surface of the tooth body (2) at the connection part of the alloy head (3) by laser cladding.

3. A coal mining machine cutting tooth with a wear-resistant coating according to claim 1, characterized in that, The wear-resistant ring (4) is made of nickel-based carbide.

4. A coal mining machine cutting tooth with a wear-resistant coating according to claim 1, characterized in that, The wear-resistant ring (4) has several guide grooves axially arranged on its surface; the wear-resistant ring (4) has a width of 20-30 mm and a thickness of 2-3 mm.

5. A coal mining machine cutting tooth with a wear-resistant coating according to claim 1, characterized in that, Wear-resistant protective layers are deposited on the surfaces of the tooth body (2), alloy head (3) and wear-resistant ring (4) by vacuum plasma physical vapor deposition.

6. A coal mining machine cutting tooth with a wear-resistant coating according to claim 1, characterized in that, The wear-resistant protective layer is a ceramic coating.

7. A coal mining machine cutting tooth with a wear-resistant coating according to claim 6, characterized in that, The ceramic coating is a nitride or carbide coating of transition metals.

8. A coal mining machine cutting tooth with a wear-resistant coating according to claim 6, characterized in that, The ceramic coating thickness is 5-15 micrometers.

9. A coal mining machine cutting tooth with a wear-resistant coating according to claim 1, characterized in that, The other end of the tooth body (2) is connected to the tooth shank (1), and the tooth body (2) and the tooth shank (1) are integrally formed.

10. A coal mining machine drum, characterized in that, The coal mining machine cutting teeth are equipped with a wear-resistant coating as described in any one of claims 1 to 9.

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