Surface anti-corrosion treatment method for pin shaft and shaft hole of mining hydraulic support and related device

Abstract

The invention discloses a mining hydraulic support pin shaft and shaft hole surface anti-corrosion treatment method and a related device. The method comprises the steps that the corrosion types of the pin shaft and shaft hole surfaces are judged; and based on the judgment result of the corrosion type, selecting a corresponding anti-corrosion technology, and carrying out anti-corrosion treatment on the surfaces of the pin shaft and the shaft hole. According to the method, firstly, corrosion types of the pin shaft and the shaft hole surface are judged, and it can be ensured that anti-corrosion treatment is more targeted; different types of corrosion are different in generation mechanism and influence factor, different anti-corrosion technologies are selected for treatment according to different corrosion conditions, the anti-corrosion effect can be further improved, further development of corrosion is prevented, and the service life of the hydraulic support is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-corrosion treatment of mining machinery parts, and in particular relates to a method for anti-corrosion treatment of the surface of a pin shaft and a shaft hole of a mining hydraulic support and a related device. Background Art

[0002] The pin is the core component of the four-bar connection movement of the hydraulic support in underground coal mines. It is an important element for the support to bear the load. During the operation of the support, it withstands the impact of mine pressure, torsion, bending and rotational wear, and plays an important role in the safety and stability of the support during use.

[0003] Under normal circumstances, the design strength and life of the pin can meet the use requirements of the hydraulic support; however, after long-term use of the hydraulic support, due to the harsh working environment in the coal mine, the presence of coal sand particles, corrosive media and other influencing factors, and the lack of bearings and sealing treatment in the pin design, the pin will suffer from serious wear, corrosion and other defects. During the overhaul of the hydraulic support, a large number of pins were found to be damaged. Some pins can be repaired by surface enhancement, while others are difficult to disassemble due to severe rust and need to be cut with other tools, which increases the workload and causes destructive damage to the hydraulic support, thereby greatly increasing the maintenance cost.

[0004] When disassembling the hydraulic support, the manual pin puller and the homemade hydraulic pin puller cannot remove the hinge pins between the base and the connecting rod, and the protective beam and the connecting rod. Through observation and research on the exposed parts of the hinge pins between the base and the connecting rod, and the protective beam and the connecting rod, it was found that the hinge holes and the pins were severely corroded, and there were signs of relative rotation. It was judged that the locking of the pins and the connecting rod holes was the main reason for the difficulty in disassembling the pins.

[0005] In the case where the pin cannot be removed, one method is to heat the stuck pin part, loosen the pin and the connecting rod by thermal expansion and contraction, and then use a homemade hydraulic pin puller to remove the pin. However, the heating process is time-consuming, labor-intensive and inefficient. The second method is to design and manufacture a vibration device to loosen the pin and the hinge hole, and then use a light pin puller to pull out the pin. However, this solution has the problems of high noise and long time consumption. The third method is to use gas cutting of the pin and replace it with a new pin during assembly, but it increases the remanufacturing cost. In order to solve the problem of corrosion on the pins and shaft holes, which affects the normal production operation in the later stage, the surface electroplating process is currently used to directly perform anti-corrosion treatment on the pins and shaft holes; however, affected by the operating environment factors, the surface corrosion types of the pins and shaft holes in different production environments are different. Directly using the surface electroplating process to perform anti-corrosion treatment on the pins and shaft holes will make the electroplating coating on the surface of the pins and shaft holes thinner. In actual work, they will be frequently subjected to heavy loads, resulting in the plating layer being fragile and easy to peel off, thereby reducing the anti-corrosion effect of the pins and shaft holes, affecting production. Summary of the invention

[0006] The present invention provides a method for surface anti-corrosion treatment of a pin shaft and an axis hole of a mining hydraulic support and related devices, so as to solve the technical defect in the prior art that the surface corrosion types of the pin shaft and the axis hole in different production environments are different, and the pin shaft and the axis hole are directly anti-corroded by using electroplating technology, resulting in a thin electroplating coating, which causes the coating to be frequently subjected to heavy loads in actual work, and is fragile and easy to peel off, thereby reducing the anti-corrosion effect of the pin shaft and the axis hole.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, a method for anti-corrosion treatment of the surface of a pin shaft and a shaft hole of a mining hydraulic support is provided, comprising: Determine the type of corrosion on the pin and shaft hole surfaces; Based on the judgment result of the corrosion type, the corresponding anti-corrosion technology is selected to perform anti-corrosion treatment on the surface of the pin shaft and the shaft hole.

[0008] Furthermore, the determination of the corrosion type of the pin and the shaft hole surface specifically includes: The corrosion images on the surfaces of the pin shaft and the shaft hole are collected by using an image collection device; Processing and analyzing the collected corrosion images to obtain corrosion characteristics; Based on the corrosion characteristics, the corrosion type is determined.

[0009] Furthermore, based on the judgment result of the corrosion type, the corresponding anti-corrosion technology is selected to perform anti-corrosion treatment on the surface of the pin shaft and the shaft hole, specifically including: The corrosion types include oxygen depolarization corrosion, hydrogen depolarization corrosion and wear corrosion; The anti-corrosion technology includes carbon-nitrogen-oxygen composite treatment technology, laser cladding treatment technology and arc surfacing technology; Among them, when the judgment result of the corrosion type is the oxygen depolarization corrosion, the carbon-nitrogen-oxygen composite treatment technology is selected; when the judgment result of the corrosion type is the hydrogen depolarization corrosion, the laser cladding treatment technology and the arc surfacing technology are selected; when the judgment result of the corrosion type is the wear corrosion, the laser cladding treatment technology and the arc surfacing technology are also selected.

[0010] Furthermore, the surfaces of the pin shaft and the shaft hole are subjected to anti-corrosion treatment, specifically including: When the corrosion type is oxygen depolarization corrosion, coal powder or coal slag adheres to the gap between the pin shaft and the pin hole, causing corrosion on the surface of the pin shaft and the pin hole, resulting in the locking of the pin shaft and the shaft hole; While the pin shaft and the shaft hole are treated for corrosion resistance by using carbon-nitrogen-oxygen composite treatment technology, a sealing treatment is performed between the pin shaft and the shaft hole.

[0011] Furthermore, the surfaces of the pin shaft and the shaft hole are subjected to anti-corrosion treatment, specifically including: When the corrosion type is hydrogen depolarization corrosion, the outer circle of the pin is processed during the anti-corrosion treatment of the pin, and at the same time, the oil and debris on the surface of the pin are removed and dried; Selecting TY-2C stainless steel material as the surface cladding layer material, and cladding the TY-2C stainless steel material on the surface of the pin shaft through laser cladding processing technology; When processing the shaft hole, the shaft hole surface is cleaned and the shaft hole is preheated; D507Mo stainless steel wire is selected and the shaft hole is processed by arc surfacing technology.

[0012] Furthermore, the surfaces of the pin shaft and the shaft hole are subjected to anti-corrosion treatment, specifically including: When the corrosion type is wear corrosion, when processing the pin shaft, TY-3C stainless steel material is selected as the surface cladding layer material, and the TY-3C stainless steel material is clad on the surface of the pin shaft through laser cladding processing technology; When processing the shaft hole, ER410NiMo stainless steel wire is selected and the shaft hole is treated for corrosion resistance through arc surfacing technology.

[0013] Furthermore, after the shaft hole is subjected to anti-corrosion treatment by arc cladding technology, the following steps are also included: The surfacing welding area of ​​the shaft hole is treated with heat preservation to prevent cracks in the shaft hole.

[0014] In the second aspect, a system for treating the surface of a pin shaft and a shaft hole of a mining hydraulic support is provided, comprising: A judgment module is used to judge the corrosion type of the pin and the shaft hole surface; An anti-corrosion technology selection module is used to select an anti-corrosion technology corresponding to the corrosion type; The treatment module is used for performing anti-corrosion treatment on the surfaces of the pin shaft and the shaft hole.

[0015] In a third aspect, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable in the processor, wherein when the processor executes the computer program, the steps of the method for anti-corrosion treatment of the surface of the pin shaft and the shaft hole of the mining hydraulic support as described above are implemented.

[0016] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for anti-corrosion treatment of the surface of the pin shaft and the shaft hole of the mining hydraulic support as described above are implemented.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This method first determines the corrosion type on the surface of the pin shaft and the shaft hole, which can ensure that the anti-corrosion treatment is more targeted; different types of corrosion have different mechanisms and influencing factors. Different anti-corrosion technologies are used for treatment according to different corrosion conditions, which can further improve the anti-corrosion effect, prevent further development of corrosion, and extend the service life of the hydraulic support.

[0018] 2. The image acquisition device can accurately capture the subtle corrosion phenomenon on the pin and shaft hole surface, avoiding the subjectivity and errors that may be caused by manual observation and improving the accuracy of judgment. Through professional image processing and data analysis software, the collected corrosion images can be quantitatively analyzed and the corrosion characteristics can be extracted, providing an objective basis for judging the corrosion type and reducing the subjectivity and uncertainty of human judgment.

[0019] 3. By selecting anti-corrosion technology that matches the corrosion type, the corrosion rate on the pin and shaft hole surface can be significantly reduced, thereby extending the service life of the hydraulic support. This not only reduces the maintenance and replacement costs caused by corrosion, but also improves the continuity and stability of mine production.

[0020] 4. Carbon-nitrogen-oxygen composite treatment technology forms a dense composite coating on the surface of the pin and the shaft hole. This coating has excellent corrosion resistance and can effectively isolate the contact between the corrosive medium and the substrate, thereby significantly reducing the rate of oxygen depolarization corrosion. Secondly, the gap between the pin and the shaft hole is a place where corrosive media can easily invade, especially when impurities such as coal powder or coal slag are attached, it is easier to form a corrosive environment. Through sealing treatment, these corrosive media can be effectively prevented from invading the pin and shaft hole surface through the gap, further enhancing the anti-corrosion effect.

[0021] 5. TY-2C stainless steel material has excellent corrosion resistance and mechanical properties. It can be clad on the pin surface by laser cladding technology to form a dense and strong anti-corrosion layer, which can effectively isolate the contact between the corrosive medium and the pin substrate, thereby significantly reducing the rate of hydrogen depolarization corrosion. D507Mo stainless steel wire also has good corrosion resistance and wear resistance. It can be clad on the surface of the shaft hole by arc cladding technology to form a cladding layer with moderate thickness and close integration with the substrate, which not only enhances the corrosion resistance of the shaft hole, but also improves its surface hardness and wear resistance, further extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A flow chart of the anti-corrosion treatment method for the pin shaft and shaft hole surface of a mining hydraulic support provided by the present invention; Figure 2-Figure 8 A schematic diagram of a sealing device in the method for anti-corrosion treatment of the pin shaft and shaft hole surface of a mining hydraulic support provided by the present invention; Fig. 9 The principle diagram of the surface anti-corrosion treatment system for the pin shaft and shaft hole of the mining hydraulic support provided by the present invention; Among them, 1. Pin seat; 2. Insert plate; 3. Pin shaft; 4. Type card; 5. Semicircular key. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The pin is the core component of the four-bar connection movement of the hydraulic support in underground coal mines. It is an important element for the support to bear the load. During the operation of the support, it withstands the impact of mine pressure, torsion, bending and rotational wear, and plays an important role in the safety and stability of the support during use.

[0031] Under normal circumstances, the design strength and life of the pin can meet the use requirements of the hydraulic support; however, after long-term use of the hydraulic support, due to the harsh working environment in the coal mine, the presence of coal sand particles, corrosive media and other influencing factors, and the lack of bearings and sealing treatment in the pin design, the pin will suffer from serious wear, corrosion and other defects. During the overhaul of the hydraulic support, a large number of pins were found to be damaged. Some pins can be repaired by surface enhancement, while others are difficult to disassemble due to severe rust and need to be cut with other tools, which increases the workload and causes destructive damage to the hydraulic support, thereby greatly increasing the maintenance cost.

[0032] When disassembling the hydraulic support, the manual pin puller and the homemade hydraulic pin puller cannot remove the hinge pins between the base and the connecting rod, and the protective beam and the connecting rod. Through observation and research on the exposed parts of the hinge pins between the base and the connecting rod, and the protective beam and the connecting rod, it was found that the hinge holes and the pins were severely corroded, and there were signs of relative rotation. It was judged that the locking of the pins and the connecting rod holes was the main reason for the difficulty in disassembling the pins.

[0033] In the case where the pin cannot be removed, one method is to heat the stuck pin part, loosen the pin and the connecting rod by thermal expansion and contraction, and then use a homemade hydraulic pin puller to remove the pin. However, the heating process is time-consuming, labor-intensive and inefficient. The second method is to design and manufacture a vibration device to loosen the pin and the hinge hole, and then use a light pin puller to pull out the pin. However, this solution has the problems of high noise and long time consumption. The third method is to use gas cutting of the pin and replace it with a new pin during assembly, but it increases the remanufacturing cost.

[0034] In order to solve the problem of corrosion on the pins and shaft holes, which affects the normal production operation in the later stage, the surface electroplating process is currently used to directly perform anti-corrosion treatment on the pins and shaft holes; however, affected by the operating environment factors, the surface corrosion types of the pins and shaft holes in different production environments are different. Directly using the surface electroplating process to perform anti-corrosion treatment on the pins and shaft holes will make the electroplating coating on the surface of the pins and shaft holes thinner. In actual work, they will be frequently subjected to heavy loads, resulting in the plating layer being fragile and easy to peel off, thereby reducing the anti-corrosion effect of the pins and shaft holes, affecting production.

[0035] In order to solve the above technical defects, the inventor provides a method and related device for anti-corrosion treatment of the pin shaft and shaft hole surface of a mining hydraulic support. The present invention is further described in detail below in conjunction with the accompanying drawings: like Figure 1-8 As shown, in the first aspect, an embodiment of the present invention provides a method for anti-corrosion treatment of the surface of a pin shaft and a shaft hole of a mining hydraulic support, comprising: S101. Determine the corrosion type on the surface of the pin shaft and the shaft hole. Exemplarily, in the process of determining the corrosion type, firstly, construct a corrosion type acquisition platform, place the corroded pin shaft and shaft hole on the acquisition platform, and use an image acquisition device to acquire corrosion images on the surface of the pin shaft and shaft hole. After the image acquisition is completed, the acquired corrosion images are subjected to data processing and analysis to obtain corrosion features. The image features include the corrosion area, corrosion depth and corrosion morphology of the pin shaft and shaft hole under different operating environments. Finally, based on these corrosion features, the corrosion type is determined.

[0036] S102. Based on the judgment result of the corrosion type, select corresponding anti-corrosion technology to perform anti-corrosion treatment on the surface of the pin shaft and the shaft hole; illustratively, since the environment in which coal mining is located is very humid and dark, and the water quality composition of the mine is very complex, underground coal mining equipment often suffers from severe corrosion.

[0037] Coal mining machines generate a lot of dust during the coal mining process. In order to reduce the dust content in the underground air, spray and water spraying are used to reduce dust, which increases the relative humidity of the underground air, generally around 80%, up to more than 90%; the underground air contains a lot of harmful gases such as carbon monoxide, carbon dioxide, sulfur dioxide, hydrogen sulfide, methane, etc. These harmful gases and harmful substances are dissolved in the humid air and underground water to generate various corrosive electrolyte aqueous solutions, which are dissolved with powder and attached to the metal surface of the hydraulic support. The composition of underground water in my country's coal mines is relatively complex. Some coal mines have high sulfur and salt content. In mines with high groundwater levels, the phenomenon of water spraying on the working face is quite serious. Most of the mine water in my country's coal mines is weakly alkaline or neutral, with a pH value of 7 to 9, and the rest is slightly acidic, with a pH value of 4 to 7. The corrosion mechanism of coal mine comprehensive mining equipment is different due to different pH values ​​of mine water.

[0038] Based on the above situation, the corrosion types include oxygen depolarization corrosion, hydrogen depolarization corrosion and wear corrosion. Under weakly alkaline or neutral mine water conditions, the solubility of oxygen in oxygen depolarization corrosion is relatively low. Under the premise that the steel materials of coal mine comprehensive mining equipment are not passivated, the rate of simple oxygen depolarization corrosion is relatively small.

[0039] Under the acidic mine water conditions, the metal surface absorbs water vapor or sprinkles water to form a water film. Carbon dioxide dissolved in the water film becomes an electrolyte solution, forming countless tiny primary cells, and electrochemical corrosion occurs to release hydrogen. This type of corrosion belongs to hydrogen depolarization corrosion (hydrogen evolution corrosion). Some parts of comprehensive mining equipment will have surface friction due to relative movement during service, such as hydraulic support pins. The friction surface will expose a new surface due to deformation, which will cause deeper corrosion and faster speed. This wear corrosion is a typical common corrosion. Because the two processes of wear and corrosion promote each other, the destruction rate is significantly higher than that of simple corrosion. In order to deal with the above three types of corrosion, the anti-corrosion technologies used in this scheme include carbon-nitrogen-oxygen composite treatment technology, laser cladding treatment technology and arc surfacing technology; among them, when the corrosion type is judged as oxygen depolarization corrosion, carbon-nitrogen-oxygen composite treatment technology is selected; when the corrosion type is judged as hydrogen depolarization corrosion, laser cladding treatment technology and arc surfacing technology are selected; when the corrosion type is judged as wear corrosion, laser cladding treatment technology and arc surfacing technology are also selected.

[0040] Specifically, when the corrosion type is oxygen depolarization corrosion, it means that coal powder or coal slag is attached to the gap between the pin and the pin hole, causing corrosion on the pin and the pin hole surface, resulting in the pin and the shaft hole being locked; at this time, the carbon-nitrogen-oxygen composite treatment technology is used to treat the pin and the shaft hole for corrosion protection, which can not only obtain certain corrosion resistance, but also make the pin surface more wear-resistant, meeting the use requirements under this working condition; since the anti-corrosion treatment of the shaft hole requires an additional boring and surface treatment process, the cost is relatively increased and the improvement effect is not obvious, from the perspective of economy, it is recommended that the shaft hole is not treated for corrosion protection. For example, the hydraulic support plays the role of supporting the roof during coal mining. The pin, as the main force-bearing element, needs to bear a large load, especially the pin between the base and the connecting rod, which is most prone to rust, locking and difficult to disassemble; at this time, the carbon-nitrogen-oxygen composite treatment process material requirements and inspection methods of the pin shall be implemented in accordance with the technical requirements of JB / T 13023 Carbon-nitrogen-oxygen composite treatment (QPQ). In actual processing, the processing party will deliver the product to meet the lower limit of the standard in order to reduce production costs. In order to avoid affecting the anti-corrosion effect of the pin, the key indicators that should be met after QPQ treatment are given: the surface hardness is ≥800HV when tested with a Vickers hardness tester, the compound layer depth is 18-30μm when tested with a metallographic method, and the total depth of the infiltration layer is ≥0.35mm. Since the pin is installed in the shaft hole of the inner main rib and the outer main rib of the base, the connecting rod rotates around the pin, and the pin is radially limited by the plug plate inserted into the pin holder. The outer side of the pin end face is exposed to the outside. In order to prevent dust and particles from entering the working surface of the pin, the limit structure of the pin end face is optimized, and the pin and the shaft hole are sealed.

[0041] like Figure 2-Figure 8 As shown, an annular keyway is machined on the back of the stop pin seat 1, the stop pin seat 1 is welded on the hydraulic support, two semicircular keys 5 are symmetrically placed in the circular keyway, the plug plate 2 is inserted in the stop pin seat 1, and the two semicircular keys 5 are respectively restricted in the annular keyway, and the D-type card 4 restricts the plug plate 2 from falling off from the stop pin seat 1. It is worth noting that the diameter of the annular keyway in the stop pin seat 1 is the diameter of the pin shaft 3 + 32mm, and the keyway depth is 10mm; the semicircular key 5 is machined from a disc with a thickness of 9mm, and the diameter of the disc is the diameter of the pin shaft 3 + 30mm. The rectangular plate with a middle width equal to the width of the plug plate 2 is cut by wire cutting to form two semicircular keys 5. Finally, the end face of the pin shaft 3 is sealed and protected by the plug plate 2 and the two semicircular keys 5, effectively preventing dust and large particles from entering the shaft hole of the pin shaft 3. The combined application of anti-corrosion treatment on the pin shaft surface and optimization of the end face limit structure effectively solves the problem of the pin shaft being difficult to disassemble and replace due to rust, and does not require additional lubrication and maintenance work, thereby extending the service life of the hydraulic support and reducing its maintenance cost.

[0042] When the corrosion type is hydrogen depolarization corrosion, the wear degree of the pin and the shaft hole is small, and the corrosion degree is the highest. Therefore, the corrosion resistance of the cladding material is mainly considered in the anti-corrosion process. According to the materials suitable for the process type, cladding materials with relatively better corrosion resistance are selected. At the same time, in order to avoid adhesive wear between the mating surfaces of the cladding layer, which makes it difficult to disassemble the pin, the surface hardness of the cladding layer on the surface of the pin and the surface hardness of the cladding layer on the shaft hole are adjusted to have a significant hardness difference. For example, in the process of anti-corrosion treatment of the pin, the outer circle of the pin is first turned to the nominal size of -0.8 to -1.2 mm using a lathe, and then the surface of the pin and the shaft hole is cleaned with a degreasing agent to remove oil and debris, and then the surface of the pin is wiped dry and dried; then the pin is fixed on the outer circle laser cladding equipment using two top positioning and clamping methods, and the outer surface of the pin is laser clad. It is worth noting that in the cladding process, the cladding material is TY-2C stainless steel powder. The main chemical composition of TY-2C powder is Cr: 18.0-21.0; Ni: 2.0-4.0; Mn: ≤0.5; Mo: 1.0-1.5. The recommended powder particle size range is 100 / 270 mesh. If the powder particle size exceeds this range, the convergence effect at the front end of the cladding head is not ideal, which affects the cladding effect. The cladding process parameters are selected as 3-5mm spot diameter (for cladding heads with non-adjustable spot size, it is sufficient to determine that the spot size is roughly within this range); the height of the cladding head from the workpiece is often The standard design is 15mm, and the upper and lower deviations do not exceed 1mm; the recommended laser energy density is 20-30J / mm2. Too low energy density will lead to poor bonding with the substrate, and too high energy density will cause element burning and affect the corrosion resistance of the cladding layer; argon is preferably used as the shielding gas, and nitrogen can be used instead if there is no argon. The shielding gas flow rate is 10-15L / min. Too small a shielding gas flow rate may result in the inability to form an effective protection area at the cladding position, and too large a shielding gas flow rate may blow away the powder and affect the gathering of the powder. The TY-2C stainless steel material is clad on the surface of the pin shaft through laser cladding processing technology. After the cladding is completed, the pin is cooled to room temperature, and the outer diameter of the pin after cladding is measured with a vernier caliper. The increased thickness of the cladding layer is obtained by subtracting the size before cladding. The single-side thickness of the cladding layer is 1.4-1.6 mm. Finally, an angle grinder is used to grind a 50X50mm hardness detection area on the surface of the cladding layer, and a portable hardness tester is used to detect the hardness of the cladding layer at 45-50HRC. The outer surface of the pin is precision-turned to the nominal size of +0.3-0.5mm. The surface of the piston rod is ground with an external cylindrical grinding machine to the nominal size of +0.03-0.05mm. The outer surface of the pin is polished to the nominal size with a roughness of Ra <0.8.

[0043] During hydrogen depolarization corrosion, when processing the shaft hole, firstly, the shaft hole is rough bored as a whole. After boring, the inner hole size is the nominal size + (2.8 ~ 3.2) mm. Then, while cleaning the surface of the shaft hole, the shaft hole is preheated. During the preheating process, local preheating is adopted. The preheating temperature is detected by an infrared temperature measuring gun. The preheating temperature of 100 ~ 150 ℃ should be ensured not to be lower than the minimum preheating temperature to avoid cracks, and the preheating temperature should not be too high to avoid coarsening of the metal grains near the fusion zone and reduce the welding quality. The surfacing material is D507Mo stainless steel wire with a material specification of φ1.2mm. The shaft hole is processed by arc surfacing technology. During the surfacing process, the arc surfacing process parameters use DC reverse connection, current 240~280A, voltage 26~28V, CO2 gas flow rate should be 20~25L / min, and the dry extension length of the welding wire should be controlled within the range of 18~25mm; immediately after surfacing, the surfacing area is insulated and cooled slowly with insulation blankets, insulation cotton, etc. to avoid cooling too quickly to form hard and brittle structures, thereby preventing cracks; after cooling to room temperature, a vernier caliper is used to measure the inner diameter of the shaft hole after surfacing, and the size before surfacing minus the size after surfacing is the increased thickness of the surfacing layer. The single-side thickness of the surfacing layer is ≥3.0mm. In the grinding hardness detection area of ​​the surfacing layer, a portable hardness tester is used to detect the hardness of the cladding layer of 40~45HRC; finally, the shaft hole is bored as a whole and processed to the nominal size.

[0044] When the corrosion type is wear corrosion, since wear corrosion is a common corrosion phenomenon of mechanical parts in coal mines, the relative movement between the two contact surfaces causes wear, and the corrosive environment also causes corrosion and wear on the parts. When designing the anti-corrosion layer, the selection of materials should take into account both corrosion resistance and wear resistance, and synchronous wear should be avoided between the two anti-corrosion layers. It is also necessary to adjust the surface hardness of the pin surface cladding layer and the surface hardness of the shaft hole cladding layer. There is a significant hardness difference. When processing the pin, TY-3C stainless steel material is selected as the surface cladding layer material. TY-3C is a stainless steel powder with moderate chromium, nickel and molybdenum content. It is suitable for laser cladding process. It has high hardness, excellent wear resistance, and good corrosion resistance. It is suitable for working conditions with both wear and corrosion. Specifically, the pin shaft is turned to a nominal size of -0.8 to -1.2 mm using a lathe, and then the pin shaft surface is cleaned with a degreasing agent to remove oil and debris, and then the pin shaft surface is wiped dry; secondly, the pin shaft is fixed on the outer circle laser cladding equipment using two top positioning and clamping methods, and the outer surface of the pin shaft is laser clad. During the processing, the cladding material uses TY-3C stainless steel powder, and the main chemical composition of TY-3C powder is Cr: 18.5-19.5; Ni: 2.0-3.0; Mo: 1.0-1.5. The recommended powder particle size range is 100 / 270 mesh. If the powder particle size exceeds this range, the convergence effect at the front end of the cladding head is not ideal, which affects the cladding effect. Specifically, for the cladding process parameters, the spot diameter is selected to be 3-5mm (for cladding heads with non-adjustable spot size, it is sufficient to ensure that the spot size is roughly within this range); the height of the cladding head from the workpiece is conventionally designed to be 15mm, with an upper and lower deviation of no more than 1mm; the recommended laser energy density is 25-32J / mm2. Too low energy density will lead to poor bonding with the substrate, while too high energy density will cause element burnout and affect the corrosion resistance of the cladding layer; the protective gas is preferably First, argon gas is used. Nitrogen can be used as a substitute if there is no argon gas. The protective gas flow rate is 10-15L / min. If the protective gas flow rate is too small, it may not form an effective protective area at the cladding position. If the protective gas flow rate is too large, the powder may be blown away and affect the aggregation of the powder. After the cladding is completed, it is cooled to room temperature. The outer diameter of the pin shaft after cladding is measured with a vernier caliper. The thickness of the cladding layer is increased by subtracting the size before cladding. The single-side thickness of the cladding layer is 1.4-1.6mm. The 50X50mm hardness detection area on the surface of the cladding layer is grinded with an angle grinder, and the hardness of the cladding layer is tested with a portable hardness tester. 50-55HRC. Finally, the outer surface of the pin shaft is precision-turned to the nominal size +0.3-+0.5mm, and the piston rod surface is ground with an external cylindrical grinding machine to the nominal size +0.03-+0.05mm, and the outer surface of the pin shaft is polished to the nominal size, with a roughness Ra <0.8.

[0045] When processing the shaft hole, fix the base or connecting rod to be processed on the workbench of the CNC boring machine, and perform rough boring on the shaft hole as a whole. The inner hole size after boring is the nominal size + (2.8~3.2) mm, and then remove impurities such as rust, oil and moisture from the shaft hole to be welded. After the processing is completed, preheat the shaft hole locally, and use an infrared temperature gun to detect the preheating temperature. The preheating temperature of 100~150℃ should be ensured not to be lower than the minimum preheating temperature to avoid cracks, and the preheating temperature should not be too high to prevent the metal grains near the fusion zone from coarsening and reducing the welding quality. When the arc surfacing technology is used for anti-corrosion treatment of the shaft hole, the surfacing material is ER410NiMo stainless steel wire with a material specification of φ1.2mm; the specific arc surfacing process parameters use DC reverse connection, current 260~280A, voltage 26~28V, CO2 gas flow rate should be 20~25L / min, and the dry extension length of the welding wire should be controlled within the range of 15~25mm; after surfacing, the surfacing part should be immediately insulated with insulation blankets, insulation cotton, etc. to avoid cooling. The hard and brittle structure is formed too quickly, thus preventing cracks from occurring; then after cooling to room temperature, a vernier caliper is used to measure the inner diameter of the shaft hole after surfacing welding. The size before surfacing welding minus the size after surfacing welding is the thickness of the surfacing layer. The single-side thickness of the surfacing layer is ≥3.0mm; finally, in the grinding hardness detection area of ​​the surfacing layer, a portable hardness tester is used to detect the hardness of the cladding layer of 40-50HRC, and the base and connecting rod to be processed are fixed on the workbench of the CNC boring machine, and the shaft hole is integrally bored and processed to the nominal size. When the surface of the pin shaft and the shaft hole of the mining hydraulic support is treated with anti-corrosion by this method, the method first determines the type of corrosion on the surface of the pin shaft and the shaft hole, which can ensure that the anti-corrosion treatment is more targeted; different types of corrosion have different mechanisms and influencing factors. According to different corrosion conditions, different anti-corrosion technologies are selected for treatment, which can further improve the anti-corrosion effect, prevent further development of corrosion, and extend the service life of the hydraulic support. Moreover, in the judgment process, the image acquisition device can be used to accurately capture the subtle corrosion phenomenon on the surface of the pin and the shaft hole, avoiding the subjectivity and errors that may be caused by manual observation and improving the accuracy of judgment. Through professional image processing and data analysis software, the collected corrosion images can be quantitatively analyzed and the corrosion characteristics can be extracted, providing an objective basis for judging the corrosion type and reducing the subjectivity and uncertainty of human judgment; finally, different targeted anti-corrosion technologies are selected for different corrosion types on the surface of the pin and shaft hole, solving the technical defects that the surface corrosion types of the pin and shaft hole in different production environments are different in the prior art, and the electroplating process technology is directly used to treat the pin and shaft hole for corrosion, resulting in a thin electroplating coating, which causes the coating to be frequently overloaded in actual work, fragile and easy to peel off, and the anti-corrosion effect of the pin and shaft hole is reduced.

[0046] In a second aspect, an embodiment of the present invention provides a system for treating the surface of a pin shaft and a shaft hole of a mining hydraulic support, such as Fig. 9 As shown, including: A judgment module is used to judge the corrosion type of the pin and the shaft hole surface; An anti-corrosion technology selection module is used to select an anti-corrosion technology corresponding to the corrosion type; The treatment module is used for performing anti-corrosion treatment on the surfaces of the pin shaft and the shaft hole.

[0047] In a third aspect, an embodiment of the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable in the processor, wherein the processor implements the steps of the above-mentioned method for anti-corrosion treatment of the surface of the pin shaft and the shaft hole of the mining hydraulic support when executing the computer program.

[0048] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for anti-corrosion treatment of the surface of the pin shaft and the shaft hole of the mining hydraulic support as described above are implemented.

[0049] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

[0050] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0051] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0052] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0053] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for anti-corrosion treatment of the pin shaft and shaft hole surface of a mining hydraulic support, characterized in that: include: Determine the type of corrosion on the pin and shaft hole surfaces; Based on the judgment result of the corrosion type, the corresponding anti-corrosion technology is selected to perform anti-corrosion treatment on the surface of the pin shaft and the shaft hole.

2. The method for anti-corrosion treatment of the pin shaft and shaft hole surface of a mining hydraulic support according to claim 1 is characterized in that: The determination of the corrosion type of the pin and the shaft hole surface specifically includes: Using an image acquisition device, the corrosion images on the surfaces of the pin shaft and the shaft hole are acquired; Processing and analyzing the collected corrosion images to obtain corrosion characteristics; Based on the corrosion characteristics, the corrosion type is determined.

3. The method for anti-corrosion treatment of the pin shaft and shaft hole surface of a mining hydraulic support according to claim 1, characterized in that: Based on the judgment result of the corrosion type, the corresponding anti-corrosion technology is selected to perform anti-corrosion treatment on the surface of the pin shaft and the shaft hole, specifically including: The corrosion types include oxygen depolarization corrosion, hydrogen depolarization corrosion and wear corrosion; The anti-corrosion technology includes carbon-nitrogen-oxygen composite treatment technology, laser cladding treatment technology and arc surfacing technology; Among them, when the judgment result of the corrosion type is the oxygen depolarization corrosion, the carbon-nitrogen-oxygen composite treatment technology is selected; when the judgment result of the corrosion type is the hydrogen depolarization corrosion, the laser cladding treatment technology and the arc surfacing technology are selected; when the judgment result of the corrosion type is the wear corrosion, the laser cladding treatment technology and the arc surfacing technology are also selected.

4. The method for anti-corrosion treatment of the pin shaft and shaft hole surface of a mining hydraulic support according to claim 3 is characterized in that: The surfaces of the pin shaft and the shaft hole are subjected to anti-corrosion treatment, specifically including: When the corrosion type is oxygen depolarization corrosion, coal powder or coal slag adheres to the gap between the pin shaft and the pin hole, causing corrosion on the surface of the pin shaft and the pin hole, resulting in the locking of the pin shaft and the shaft hole; While the carbon-nitrogen-oxygen composite treatment technology is used to perform anti-corrosion treatment on the pin shaft and the shaft hole, a sealing treatment is performed between the pin shaft and the shaft hole.

5. The method for anti-corrosion treatment of the pin shaft and shaft hole surface of a mining hydraulic support according to claim 3, characterized in that: The surfaces of the pin shaft and the shaft hole are subjected to anti-corrosion treatment, specifically including: When the corrosion type is hydrogen depolarization corrosion, the outer circle of the pin is processed during the anti-corrosion treatment of the pin, and at the same time, the oil and debris on the surface of the pin are removed and dried; Selecting TY-2C stainless steel material as the surface cladding layer material, and cladding the TY-2C stainless steel material on the surface of the pin shaft through laser cladding processing technology; When processing the shaft hole, the shaft hole surface is cleaned and the shaft hole is preheated; D507Mo stainless steel wire is selected and the shaft hole is processed by arc surfacing technology.

6. The method for anti-corrosion treatment of the pin shaft and shaft hole surface of a mining hydraulic support according to claim 3, characterized in that: The surfaces of the pin shaft and the shaft hole are subjected to anti-corrosion treatment, specifically including: When the corrosion type is wear corrosion, when processing the pin shaft, TY-3C stainless steel material is selected as the surface cladding layer material, and the TY-3C stainless steel material is clad on the surface of the pin shaft through laser cladding processing technology; When processing the shaft hole, ER410NiMo stainless steel wire is selected and the shaft hole is treated for corrosion resistance through arc surfacing technology.

7. The method for anti-corrosion treatment of the pin shaft and shaft hole surface of a mining hydraulic support according to claim 6, characterized in that: After the shaft hole is treated with arc cladding technology for corrosion protection, it also includes: The surfacing welding area of ​​the shaft hole is treated with heat preservation to prevent cracks in the shaft hole.

8. A surface anti-corrosion treatment system for pin shaft and shaft hole of mining hydraulic support, characterized in that: include: A judgment module is used to judge the corrosion type of the pin and the shaft hole surface; An anti-corrosion technology selection module is used to select an anti-corrosion technology corresponding to the corrosion type; The treatment module is used for performing anti-corrosion treatment on the surfaces of the pin shaft and the shaft hole.

9. An electronic device, characterized in that: It includes a memory, a processor, and a computer program stored in the memory and executable in the processor. When the processor executes the computer program, the steps of the method for anti-corrosion treatment of the surface of the pin shaft and the shaft hole of the mining hydraulic support as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the method for anti-corrosion treatment of the surface of the pin shaft and the shaft hole of the mining hydraulic support described in any one of claims 1 to 7 are implemented.

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