Wear-resistant coating spraying structure of auger stem of sampling machine

Abstract

The utility model provides a wear-resistant coating spraying structure of a spiral drill rod of a sampling machine, which comprises a wear-resistant component, and the wear-resistant component comprises a drill rod middle shaft, a spiral blade, a sand blasting coating, a priming coating, a first transition layer, a composite coating, a second transition layer, a wear-resistant surface layer and a hole sealing film layer, a spiral blade is welded to the outer side wall of the drill rod middle shaft. The surface roughness is enhanced through sand blasting coating pretreatment, and good conditions are created for subsequent coating attachment; the bonding force between the coating and the drill rod is enhanced through the bottoming coating; the composite coating combines high hardness of ceramic particles and toughness of a metal matrix, and effectively resists abrasion; the wear-resistant surface layer is made of high-hardness tungsten carbide and can directly resist material friction; therefore, the wear resistance of the drill rod is greatly improved, the wear degree is reduced, the service life is prolonged and the replacement frequency is reduced; meanwhile, tiny holes of the wear-resistant surface layer are filled with the hole sealing film layer, external impurities and water are prevented from invading, the structural stability of the coating is further guaranteed, and the overall protection performance is maintained.

Description

Technical Field

[0001] This utility model relates to the field of sampling machine technology, and in particular to a wear-resistant coating spraying structure for a spiral drill rod of a sampling machine. Background Technology

[0002] In various sampling operations, the auger drill rod of the sampling machine plays a crucial role. It needs to continuously drill into the sampling object, such as coal and ore, to obtain samples. However, in actual operation, the auger drill rod faces a severe wear problem. Due to the varying hardness and shape of the sampled materials, and the intense friction between the drill rod and the material during sampling, conventional auger drill rods show significant wear after a short period of use. This not only reduces the service life of the drill rod, but also increases costs and affects the efficiency of sampling work due to frequent replacements.

[0003] Although some existing drill rods are made of wear-resistant materials, the wear resistance of the materials themselves is insufficient to meet the requirements of long-term, high-intensity sampling work. Others use simple surface treatments, such as electroplating, but the protective layers formed by these methods are insufficient in terms of wear resistance and adhesion, and are prone to falling off during friction, failing to fundamentally solve the wear problem of the drill rod. Therefore, a wear-resistant coating spraying structure for the spiral drill rod of a sampling machine is proposed. Utility Model Content

[0004] In view of this, the present invention aims to provide a wear-resistant coating spraying structure for the auger drill rod of a sampling machine, so as to solve or alleviate the technical problems existing in the prior art, or at least provide a beneficial alternative.

[0005] The technical solution of this utility model embodiment is implemented as follows: a wear-resistant coating spraying structure for a sampling machine spiral drill rod, including a wear-resistant component, wherein the wear-resistant component includes a drill rod central shaft, spiral blades, sandblasting coating, primer coating, first transition layer, composite coating, second transition layer, wear-resistant surface layer and sealing film layer;

[0006] The outer wall of the drill rod shaft is welded with helical blades. The outer walls of both the drill rod shaft and the helical blades are provided with sandblasting coatings. The outer wall of the sandblasting coating is fixedly connected to a primer coating. The outer wall of the primer coating is fixedly connected to a first transition layer. The outer wall of the first transition layer is fixedly connected to a composite coating. The outer wall of the composite coating is coated with a second transition layer. The outer wall of the second transition layer is fixedly connected to a wear-resistant surface layer. The outer wall of the wear-resistant surface layer is coated with a sealing film layer.

[0007] More preferably, the surface roughness of the sandblasted coating is Ra3.2-Ra6.3μm.

[0008] More preferably, the thickness of the primer coating is 0.1-0.3 mm.

[0009] More preferably, the thickness of the composite coating is 0.5-1 mm.

[0010] More preferably, the thickness of the wear-resistant surface layer is 0.2-0.5 mm.

[0011] More preferably, the thickness of both the first transition layer and the second transition layer is 0.05-0.1 mm.

[0012] More preferably, a hexagonal connecting post is welded to the top center of the drill rod shaft, and mounting holes are provided on both the upper and lower parts of one side of the hexagonal connecting post.

[0013] More preferably, a conical cutter head is provided at the bottom of the drill rod central shaft, and multiple drill bits are evenly arranged around the outer wall of the conical cutter head.

[0014] The present invention has the following advantages due to the adoption of the above technical solution:

[0015] This invention enhances surface roughness through sandblasting pretreatment, creating favorable conditions for subsequent coating adhesion; the primer coating strengthens the bond between the coating and the drill rod; the composite coating combines the high hardness of ceramic particles with the toughness of the metal substrate, effectively resisting wear; the wear-resistant surface layer is composed of high-hardness tungsten carbide, directly resisting material friction; thus significantly improving the wear resistance of the drill rod, reducing wear, extending service life, and lowering replacement frequency; simultaneously, the sealing film layer fills the micropores of the wear-resistant surface layer, preventing the intrusion of external impurities and moisture, further ensuring the stability of the coating structure and maintaining overall protective performance.

[0016] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural view of the present invention from one perspective;

[0019] Figure 2This is another structural view of the present invention;

[0020] Figure 3 This is a partial cross-sectional view of the present invention;

[0021] Figure 4 For the present utility model Figure 3 Enlarged view of area A.

[0022] Reference numerals: 1. Wear-resistant component; 11. Drill rod spindle; 12. Helical blade; 13. Sandblasting coating; 14. Primer coating; 15. First transition layer; 16. Composite coating; 17. Second transition layer; 18. Wear-resistant surface layer; 19. Sealing film layer; 20. Hexagonal connecting post; 21. Mounting hole; 22. Tapered cutter head; 23. Drill bit. Detailed Implementation

[0023] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0024] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] like Figures 1-4 As shown, this utility model embodiment provides a wear-resistant coating spraying structure for a sampling machine spiral drill rod, including a wear-resistant component 1, which includes a drill rod central shaft 11, spiral blades 12, sandblasting coating 13, primer coating 14, first transition layer 15, composite coating 16, second transition layer 17, wear-resistant surface layer 18, and sealing film layer 19.

[0026] A helical blade 12 is welded to the outer wall of the drill rod shaft 11. Both the outer walls of the drill rod shaft 11 and the helical blade 12 are coated with a sandblasted layer 13. A primer layer 14 is fixedly connected to the outer wall of the sandblasted layer 13. A first transition layer 15 is fixedly connected to the outer wall of the primer layer 14. A composite coating 16 is fixedly connected to the outer wall of the first transition layer 15. A second transition layer 17 is coated to the outer wall of the composite coating 16. A wear-resistant surface layer 18 is fixedly connected to the outer wall of the second transition layer 17. A sealing film layer 19 is coated to the outer wall of the wear-resistant surface layer 18. Sandblasting removes impurities from the surfaces of the drill rod shaft 11 and the helical blade 12. Oil stains, impurities, and oxide layers reduce the surface roughness to Ra3.2-Ra6.3μm, providing a good adhesion base for subsequent coatings and enhancing the bonding force between the coating and the drill pipe. The primer coating 14, formed by supersonic flame spraying of nickel-chromium alloy powder, has a thickness of 0.1-0.3mm. The primer coating 14 is tightly bonded to the outside of the sandblasted coating 13, further enhancing the adhesion between the entire coating system and the drill pipe, ensuring stable adhesion of subsequent coatings. The first transition layer 15, formed using a gradient spraying process, transitions the primer coating 14 material to the composite coating 16 material, with a thickness of 0.05-0.1mm. The function of the transition layer 15 is to alleviate the stress caused by the performance differences between different coating materials, enhance the adhesion between the base coating 14 and the composite coating 16, and prevent the coating from peeling off. The composite coating 16 is made of plasma-sprayed ceramic particles and metal substrate mixed powder, with a thickness of 0.5-1mm. It combines the high hardness of ceramic particles and the toughness of the metal substrate, improving the overall strength and wear resistance of the coating, and is a key intermediate layer for resisting wear. The second transition layer 17 is also formed by gradient spraying process, realizing the transition of the composite coating 16 material to the wear-resistant surface layer 18 material, with a thickness of 0.05-0.1mm. 17 effectively enhances the bonding force between the composite coating 16 and the wear-resistant surface layer 18, ensuring the stability of the coating structure; the wear-resistant surface layer 18 is formed by spraying tungsten carbide powder with supersonic flame, with a thickness of 0.2-0.5mm. Tungsten carbide has extremely high hardness and wear resistance. The wear-resistant surface layer 18 is in direct contact with the sampled material, resisting friction and protecting the drill rod body; the sealing film layer 19 is formed by brushing or spraying a sealing agent after the wear-resistant surface layer 18 has cooled. The sealing film layer 19 can fill the tiny pores of the wear-resistant surface layer 18, preventing external impurities and moisture from penetrating into the coating, enhancing the wear resistance and corrosion resistance of the coating, and extending the service life of the drill rod.

[0027] In one embodiment, specifically: the surface roughness of the sandblasted coating 13 is Ra3.2-Ra6.3 μm; a suitable surface roughness can increase the contact area between the sandblasted coating 13 and the subsequent primer coating 14; when the surface roughness is Ra3.2-Ra6.3 μm, the material of the primer coating 14 can be better embedded in the micro-uneven structure of the surface of the sandblasted coating 13 after spraying, forming a mechanical interlock, thereby significantly enhancing the adhesion between the two and ensuring that the entire coating system is stably attached to the drill rod shaft 11 and the helical blade 12; this roughness range removes the original roughness of the drill rod surface. The surface is free of oil, impurities, and oxide layers, resulting in a clean and rough surface suitable for coating adhesion. This prevents residual substances from affecting the coating's bonding strength and lays a good foundation for the performance of subsequent coatings. If the surface roughness is lower than Ra3.2μm, the surface is too smooth, and the coating adhesion will be insufficient. If it is higher than Ra6.3μm, the surface is too rough, which may lead to uneven coating thickness and affect the overall smoothness and protective effect of the coating. A roughness of Ra3.2-Ra6.3μm balances these factors well, ensuring that the coating has both good adhesion and stable overall performance.

[0028] In one embodiment, specifically: the thickness of the primer coating 14 is 0.1-0.3 mm; wherein, the main function of the primer coating 14 is to enhance the adhesion between the subsequent coating and the drill rod shaft 11 and the helical blade 12; when the thickness is 0.1-0.3 mm, there is sufficient nickel-chromium alloy material to fill the microscopic irregularities on the surface of the sandblasted coating 13, and to tightly bond with the drill rod. This bonding relies not only on mechanical interlocking but also on a certain degree of metallurgical bonding, thereby ensuring that the entire coating system can firmly adhere to the drill rod shaft 11 and the helical blade 12; if the thickness of the primer coating 14 is less than 0.1 mm, the amount of material is too small. The coating thickness is insufficient to fully cover the surfaces of the sandblasted drill rod shaft 11 and helical blades 12, failing to form a complete bonding layer and resulting in insufficient adhesion, making subsequent coatings prone to peeling. On the other hand, a thickness exceeding 0.3 mm may increase the internal stress of the coating, which in turn reduces the bonding strength between the coating and the drill rod shaft 11 and helical blades 12, while also increasing costs and spraying time. During the operation of the drill rod, it is subjected to various forces, such as torque and pressure. A primer coating of appropriate thickness 14 can alleviate the stress concentration generated at the interface between the coating and the drill rod, protect the coating from easy damage, and extend the service life of the coating.

[0029] In one embodiment, specifically: the thickness of the composite coating 16 is 0.5-1mm; wherein, a thickness of 0.5-1mm ensures sufficient wear-resistant material, effectively resisting friction and impact of materials during drilling operations. When the drilling rod frequently contacts the sampled material, the composite coating 16 can continuously exert its wear-resistant effect, extending the service life of the drilling rod. Different sampling environments and material characteristics cause different degrees of wear on the drilling rod. A thicker composite coating 16 can cope with harsher working conditions. For example, when sampling materials with high hardness or large particles, a thickness of 0.5-1mm can provide sufficient wear resistance, ensuring that the drilling rod maintains a good working condition for a longer period of time. If the composite coating 16 is too thick, its internal stress will increase, which may lead to a decrease in the bonding force between the coating and the upper and lower layers, or even cracking or peeling of the coating. A thickness of 0.5-1mm allows for a more reasonable stress distribution within the coating, ensuring both the integrity of the composite coating 16 itself and good bonding with the first transition layer 15 and the second transition layer 17, maintaining the stability of the entire coating system.

[0030] In one embodiment, specifically: the thickness of the wear-resistant surface layer 18 is 0.2-0.5 mm; wherein, the thickness of the wear-resistant surface layer 18 is between 0.2-0.5 mm, which ensures that when the drill rod is working, the surface layer has enough wear-resistant material to directly contact the sampled material and resist the friction of the material; when the auger drill rod drills into materials such as coal and ore, the wear-resistant surface layer 18 can effectively reduce its own wear and extend the service life of the drill rod; if the thickness is less than 0.2 mm, the wear-resistant surface layer 18 may be worn through quickly and cannot fully exert its wear-resistant function; while if the thickness exceeds 0.5 mm, although it can theoretically enhance wear resistance, it will increase the material cost and may cause internal stress to increase due to excessive coating thickness, affecting the bonding force between the coating and the underlying layer.

[0031] In one embodiment, specifically: the thickness of both the first transition layer 15 and the second transition layer 17 is 0.05-0.1 mm; wherein, the main function of the first transition layer 15 and the second transition layer 17 is to achieve a smooth transition in composition and performance between adjacent coatings; the first transition layer 15 is located between the base coating 14 and the composite coating 16, and the second transition layer 17 is located between the composite coating 16 and the wear-resistant surface layer 18; due to the significant differences in material properties between the different coatings, such as the base coating 14 being mostly nickel-chromium alloy, the composite coating 16 being a ceramic-reinforced metal matrix composite material, and the wear-resistant surface layer 18 being... 8 represents a tungsten carbide coating; a thickness of 0.05-0.1 mm allows for gradual changes in material composition within a limited space, preventing abrupt performance differences between coatings and thus enhancing interlayer bonding; a thickness range of 0.05-0.1 mm helps form a good bonding interface between coatings; when the thickness is too thin, the transition effect is not obvious, making it difficult to effectively improve interlayer bonding; while excessive thickness may introduce new stress concentration points, which may reduce bonding strength; a suitable thickness allows the coating materials to penetrate and fuse with each other in the transition layer area, forming a strong bond.

[0032] In one embodiment, specifically: a hexagonal connecting post 20 is welded to the top center of the drill rod shaft 11, and mounting holes 21 are provided on both the upper and lower parts of one side of the hexagonal connecting post 20; wherein, the unique hexagonal structure of the hexagonal connecting post 20 can provide a larger contact area and a more efficient torque transmission method when connected with the drive equipment. When the sampler is working, the drive equipment needs to drive the spiral blade 12 to rotate through the drill rod shaft 11 to achieve the sampling operation. Compared with the circular connecting post, the hexagonal connecting post 20 can better prevent slippage during torque transmission, ensuring that the drill rod can rotate stably and efficiently; by installing bolts, pins and other connecting parts in the mounting holes 21, the drill rod and the drive equipment can be connected more firmly. The setting of the mounting holes 21 makes the connection between the drill rod and the drive equipment more stable, which can effectively avoid problems such as drill rod falling off or abnormal operation caused by loose connection.

[0033] In one embodiment, specifically: a conical cutter head 22 is provided at the bottom of the drill rod central shaft 11, and multiple drill bits 23 are evenly arranged around the outer wall of the conical cutter head 22; wherein, the shape design of the conical cutter head 22 enables the drill rod to play a good guiding role when drilling into the sampled material, and its sharp head can more easily cut into the material, determine the direction for the subsequent drilling process, avoid the drill rod from deviating during drilling, and ensure the accuracy and stability of sampling; multiple drill bits 23 are evenly distributed on the outer wall of the conical cutter head 22, and during the rotation of the drill rod, these drill bits 23 can more effectively cut and crush the material, ensuring the smooth progress of the sampling work.

[0034] In operation, this invention involves sandblasting the drill rod shaft 11 and spiral blades 12. Appropriately sized sand particles are selected and sprayed onto the drill rod surface at a specific pressure and angle to remove oil, impurities, and oxide layers, achieving a surface roughness of Ra3.2-Ra6.3μm, forming a sandblasted coating 13, providing a good foundation for subsequent coating applications. After sandblasting, a supersonic flame spraying device is used to heat nickel-chromium alloy powder to a molten state and spray it onto the sandblasted drill rod shaft using a high-speed flame. On the surfaces of drill pipe shaft 11 and helical blade 12, spraying parameters are controlled to ensure the base coat 14 reaches a thickness of 0.1-0.3 mm, guaranteeing a tight bond between the base coat 14 and the drill pipe shaft 11 and helical blade 12. After the base coat 14 is applied, a gradient spraying process is used to gradually change the composition of the sprayed powder, causing the material of the base coat 14 to transition to the material of the composite coating 16, forming a first transition layer 15 with a thickness of 0.05-0.1 mm, enhancing the bonding force between the base layer and the intermediate layer. After the first transition layer 15 is applied, a further process is employed... The plasma spraying equipment feeds a mixture of ceramic particles and a metal matrix powder into a plasma arc for heating and melting, then sprays it onto the surface of the first transition layer 15. The spraying process parameters are controlled to achieve a composite coating thickness of 0.5-1 mm, forming a ceramic-reinforced metal matrix composite coating 16 with high hardness and toughness. After the composite coating 16 is sprayed, a gradient spraying process is used again to form a second transition layer 17, transitioning the material of the composite coating 16 to the material of the wear-resistant surface layer 18, with a similar thickness of 0.05-0.1 mm. mm; After the second transition layer 17 is sprayed, tungsten carbide powder is sprayed onto the surface of the second transition layer 17 using a supersonic flame spraying device to form a wear-resistant surface layer 18 with a thickness of 0.2-0.5 mm, giving full play to the high hardness and wear resistance of tungsten carbide; After the wear-resistant surface layer 18 is sprayed, wait for the wear-resistant surface layer 18 to cool to room temperature, and then use a brush or spraying method to evenly coat the surface of the wear-resistant surface layer 18 to form a dense sealing film layer 19, thus completing the fabrication of the wear-resistant coating spraying structure of the sampling machine auger drill rod.

[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A wear-resistant coating spraying structure for a sampling machine auger drill rod, characterized in that: The wear-resistant component (1) includes a drill rod shaft (11), a spiral blade (12), a sandblasting coating (13), a primer coating (14), a first transition layer (15), a composite coating (16), a second transition layer (17), a wear-resistant surface layer (18), and a sealing film layer (19). The outer wall of the drill rod shaft (11) is welded with a helical blade (12). The outer walls of both the drill rod shaft (11) and the helical blade (12) are provided with a sandblasting coating (13). The outer wall of the sandblasting coating (13) is fixedly connected with a base coating (14). The outer wall of the base coating (14) is fixedly connected with a first transition layer (15). The outer wall of the first transition layer (15) is fixedly connected with a composite coating (16). The outer wall of the composite coating (16) is coated with a second transition layer (17). The outer wall of the second transition layer (17) is fixedly connected with a wear-resistant surface layer (18). The outer wall of the wear-resistant surface layer (18) is coated with a sealing film layer (19).

2. The wear-resistant coating spraying structure for a sampling machine auger drill rod according to claim 1, characterized in that: The surface roughness of the sandblasted coating (13) is Ra3.2-Ra6.3μm.

3. The wear-resistant coating spraying structure for a sampling machine auger drill rod according to claim 1, characterized in that: The thickness of the base coating (14) is 0.1-0.3 mm.

4. The wear-resistant coating spraying structure for a sampling machine auger drill rod according to claim 1, characterized in that: The thickness of the composite coating (16) is 0.5-1 mm.

5. The wear-resistant coating spraying structure for a sampling machine auger drill rod according to claim 1, characterized in that: The thickness of the wear-resistant surface layer (18) is 0.2-0.5 mm.

6. The wear-resistant coating spraying structure for a sampling machine auger drill rod according to claim 1, characterized in that: The thickness of the first transition layer (15) and the second transition layer (17) is 0.05-0.1 mm.

7. The wear-resistant coating spraying structure for a sampling machine auger drill rod according to claim 1, characterized in that: A hexagonal connecting post (20) is welded to the top center of the drill rod shaft (11), and mounting holes (21) are provided on the upper and lower parts of one side of the hexagonal connecting post (20).

8. The wear-resistant coating spraying structure for a sampling machine auger drill rod according to claim 1, characterized in that: The bottom of the drill rod shaft (11) is provided with a conical cutter head (22), and a plurality of drill bits (23) are evenly arranged around the outer wall of the conical cutter head (22).

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