Fan wear repair method

Abstract

The invention discloses a fan abrasion repairing method. The technical problem that fan abrasion needs to be repaired in the prior art is solved. Repairing at least one of impeller blades, a machine shell and an air inlet; the impeller blade repairing method comprises the following steps that a plurality of first lining plates are manufactured; more than one first lining plate is sequentially welded to one blade; the first lining plates with the same number are sequentially welded to the other blades till all the blades are welded with the first lining plates with the same number; carrying out dynamic balance treatment on the impeller; the machine shell repairing method comprises the following steps that a plurality of second lining plates are manufactured; the second lining plates are sequentially welded to the machine shell; and the worn part of the shell is repaired. The repair of the air inlet comprises the following step of sequentially spraying a resin ceramic bottom layer, a resin ceramic transition layer and a resin ceramic wear-resistant layer on the air inlet. Therefore, the impeller can be subjected to wear-resistant repair under the condition that the impeller is not disassembled, the repair difficulty is greatly reduced, and the repair period is shortened.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fan wear repair, and particularly relates to a fan wear repair method. BACKGROUND

[0002] Fans are widely used in the fields of steel, cement, thermal power and the like. However, the fan often faces serious wear problems in the running process, mainly including particle impact and cavitation phenomena. When the gas containing solid particles passes through the fan, the particles will impact the fan blade and the shell at high speed, causing the surface material to gradually peel off. Under specific working conditions, water droplets are formed by the condensation of water vapor in the airflow, and the water droplets produce impact in the high-speed rotating fan, causing cavitation and further damaging the surface of the fan. Not only does it affect the working efficiency, but also it shortens the service life of the equipment. The impeller, the shell and the air inlet in the fan are core wear components, and there is a demand for long service life. The existing technology usually adopts replacement or spraying for wear repair. The repair needs to disassemble some parts of the fan, which is inconvenient to operate and low in efficiency. SUMMARY

[0003] To solve the technical problem of fan wear repair, the application provides a fan wear repair method.

[0004] In the first aspect of the application, a fan wear repair method is provided, which includes repair of at least one of an impeller blade, a shell and an air inlet.

[0005] The repair of the impeller blade includes the following steps:

[0006] The length and width dimensions of the impeller blade are determined;

[0007] A plurality of first lining plates are made according to the length and width dimensions of the impeller blade;

[0008] One or more than one first lining plate is sequentially welded to one of the blades;

[0009] The same number of first lining plates are sequentially welded to each of the other blades until all the blades are welded with the same number of first lining plates;

[0010] After the repair of the impeller blade, dynamic balance treatment is performed on the impeller;

[0011] The repair of the shell includes the following steps:

[0012] The radius and width dimensions of the shell are determined;

[0013] A plurality of second lining plates are made according to the radius and width dimensions of the shell;

[0014] Weld the second lining plate to the casing in sequence until the casing wear site repair is completed;

[0015] The repair of the air inlet comprises the following steps:

[0016] The air inlet is sprayed with a resin ceramic bottom layer, a resin ceramic transition layer and a resin ceramic wear-resistant layer in sequence.

[0017] In some embodiments, in the repair of the impeller blade, the first lining plate is provided with a plurality of first welding holes;

[0018] And / or, the width of the first lining plate is less than the width of the blade;

[0019] And / or, the first lining plate is a wear-resistant composite plate.

[0020] In some embodiments, in the repair of the impeller blade, the weight accuracy of the first lining plate at the same position of each blade is ±3g.

[0021] In some embodiments, in the repair of the impeller blade, the welding of more than one first lining plate to one blade in sequence comprises:

[0022] Welding more than one first lining plate in sequence from the blade outer edge to the center axis position.

[0023] In some embodiments, in the repair of the casing, the second lining plate has a structure of being narrow at the top and wide at the bottom in the thickness direction.

[0024] In some embodiments, in the repair of the casing, the edge of the second lining plate is inclined downward, and the adjacent two second lining plates are spliced to form a V-shaped groove.

[0025] In some embodiments, in the repair of the casing, the second lining plate is provided with a plurality of second welding holes;

[0026] And / or, the width of the second lining plate is less than the width of the casing;

[0027] And / or, the second lining plate is a wear-resistant composite plate.

[0028] In some embodiments, in the repair of the casing, the repair of the casing is local wear repair or overall repair.

[0029] In some embodiments, in the repair of the air inlet, the air inlet is sprayed with a resin ceramic bottom layer, a resin ceramic transition layer and a resin ceramic wear-resistant layer in sequence, and the resin ceramic bottom layer, the resin ceramic transition layer and the resin ceramic wear-resistant layer are all composed of silicon carbide, epoxy resin, nano-alumina and curing agent flux;

[0030] The spraying primer comprises the following mass fraction of chemical components: 15-25wt% silicon carbide, 45-55wt% epoxy resin and 4-6wt% nano-alumina, and the rest is the content of curing agent flux;

[0031] The transition layer comprises the following mass fraction of chemical components: 30-35wt% silicon carbide, 25-35wt% epoxy resin and 7-8wt% nano-alumina, and the rest is the content of curing agent flux;

[0032] The wear-resistant layer comprises the following mass fraction of chemical components: 40-45wt% silicon carbide, 15-20wt% epoxy resin and 9-10wt% nano-alumina, and the rest is the content of curing agent flux.

[0033] In some embodiments, in the repair of the air inlet, the following steps are further included:

[0034] The air inlet position is sprayed with a primer, wherein the spraying pressure is 0.3MPa, the thickness is 0.5mm, and after the spraying is completed, arc lamp heating and curing is performed for 1-3h, and the heating temperature is 80-120℃;

[0035] The air inlet position is sprayed with a transition layer, wherein the spraying pressure is 0.4MPa, the thickness is 1mm, and after the spraying is completed, arc lamp heating and curing is performed for 0.5-2h, and the heating temperature is 150-200℃;

[0036] The air inlet position is sprayed with a wear-resistant layer, wherein the spraying pressure is 0.5MPa, and the thickness is 1.5-2mm.

[0037] A fan wear repair method according to one or more embodiments of the present application comprises repair of at least one of an impeller blade, a casing and an air inlet;

[0038] The repair of the impeller blade comprises the following steps:

[0039] The length and width dimensions of the impeller blade are determined;

[0040] A plurality of first backing plates are made according to the length and width dimensions of the impeller blade;

[0041] One or more of the first backing plates are sequentially welded to one of the blades;

[0042] The same number of first backing plates are sequentially welded to each of the other blades, until all the blades have the same number of first backing plates welded thereto;

[0043] After the impeller blade is repaired, the impeller is subjected to dynamic balancing treatment;

[0044] The repairing of the casing comprises the following steps:

[0045] The radius and width of the casing are determined;

[0046] Second lining plates are made according to the radius and width of the casing;

[0047] The second lining plates are sequentially welded to the casing until the worn parts of the casing are repaired.

[0048] The repairing of the air inlet comprises the following steps:

[0049] The air inlet is sequentially sprayed with a resin ceramic bottom layer, a resin ceramic transition layer and a resin ceramic wear-resistant layer.

[0050] Thus, the impeller can be repaired without disassembling the impeller, greatly reducing the repair difficulty and shortening the repair period. The repair of the blade and the casing by the wear-resistant composite plate splicing and welding can significantly improve the wear resistance of the fan, and the service life of the blade can be increased from 1.5 years to more than 5 years. The resin ceramic spraying scheme of the air inlet solves the wear problem of the air inlet and other large curvature points. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 A structure diagram of an impeller in one or more embodiments of the application is shown.

[0052] Figure 2 Another view of the structure diagram of the impeller of Figure 1 is shown.

[0053] Figure 3 A structure diagram of the first lining plate welding in one or more embodiments of the application is shown.

[0054] Figure 4 A structure diagram of the impeller blade before repair in one or more embodiments of the application is shown.

[0055] Figure 5 A structure diagram of the impeller blade after repair in one or more embodiments of the application is shown.

[0056] Figure 6 A structure diagram of the second lining plate after welding in one or more embodiments of the application is shown.

[0057] Figure 7 A structure diagram of the second lining plate before welding in one or more embodiments of the application is shown.

[0058] Figure 8 Another view of the structure diagram of the second lining plate after welding in one or more embodiments of the application is shown.

[0059] Reference signs: 100 - fan, 110 - blade, 120 - casing, 130 - air inlet, 200 - first lining plate, 300 - second lining plate. DETAILED DESCRIPTION

[0060] In order for those skilled in the art to which the present application pertains to more clearly understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0061] In the prior art, the impeller blade usually adopts laser cladding repair technology, adopts a high-power laser to melt and cover tungsten carbide alloy powder on the worn impeller surface, and controls the cladding path through numerical control programming. The typical process parameters are laser power 3.5kW, powder feeding rate 40g / min, and a dense wear-resistant layer with a thickness of about 1mm is formed. This technology can accurately restore the impeller profile, but in actual application, it is found that due to the great difference in the density of the cladding layer (WC density 15.7g / cm 3 and the substrate 7.8g / cm 3 ), the repaired impeller has uneven mass distribution, and the rotor needs to be disassembled for offline repair. The essential defect of the laser cladding technology is that the material density difference cannot be adjusted. Due to the difficulty in controlling uniform cladding during the cladding process, the impeller dynamic balance is deteriorated, thereby causing the bearing to fail prematurely.

[0062] In the prior art, the casing usually adopts a bolt-fixed lining plate, a high-chromium cast iron lining plate with a pre-embedded nut is installed on the inner wall of the fan casing, and is fastened through bolts. Although this design is convenient to replace, under the thermal cycle working condition (such as the temperature fluctuation of 120-180℃ of the induced draft fan in the power plant), the difference in the thermal expansion coefficient of the lining plate and the casing steel (cast iron 18x10 -6 / ℃, steel 12x10 -6 / ℃) causes the bolts to bear periodic shear stress, which is prone to breakage. There are two fundamental defects in the bolt connection: one is that stress concentration is easy to cause bolt breakage, and the other is that the joint between the bolt and the lining plate is easy to cause a dust leakage channel, which accelerates the wear of the bolt.

[0063] In the prior art, the fan air inlet usually adopts a disassembly and replacement method for repair. Although the fan air inlet structure is simple, it is not convenient to disassemble and has low efficiency during the disassembly process.

[0064] The first aspect embodiment of the present application is as follows: Figure 1 , Figure 2、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown in FIGS. 1-3, a fan wear repair method is provided, including repairing at least one of an impeller blade 110, a casing 120, and an air inlet 130;

[0065] The repair of the impeller blade 110 includes the following steps:

[0066] S100: Determine the length and width dimensions of the impeller blade 110;

[0067] It can be understood that the length L and the width dimension B of the impeller blade 110 can be measured according to the fan impeller drawing or actually measured.

[0068] S110: Fabricate a plurality of first backing plates 200 according to the length and width dimensions of the impeller blade 110;

[0069] It can be understood that the length of the first backing plate 200 can be 1 / 6-1 / 2 of the length of the blade 110, and can be 1 / 6, 1 / 5, 1 / 4, 1 / 3, or 1 / 2. The width of the first backing plate 200 is less than the width of the blade 110, i.e., to ensure that the edge of the first backing plate 200 has a reserved welding point.

[0070] S120: Weld one or more first backing plates 200 to one of the blades 110 in sequence;

[0071] It can be understood that since the blade 110 has a certain curvature, welding two first backing plates 200 to one of the blades 110 in sequence, i.e., welding adjacent two blades 110, can ensure that the plurality of backing plates are welded to have a curvature similar to that of the blade 110, i.e., one or more first backing plates 200 can be welded to each blade 110 by welding, to ensure that the curved surface of the welded backing plate meets the curved surface requirement of the blade 110, and to increase the fit degree.

[0072] S130: Weld the same number of first backing plates 200 to each of the other blades 110 in sequence until all the blades 110 have the same number of first backing plates 200 welded thereto;

[0073] It can be understood that welding the same number of first backing plates 200 to each blade 110 can ensure that the welding position and the number of electrodes of each blade 110 remain consistent, thereby ensuring that the weight error of each repaired blade 110 is small. After the blade 110 is repaired, the state of unbalanced dynamic balance of the blade 110 caused by the excessive weight of the local blade 110 is reduced.

[0074] S140: After the impeller blade 110 is repaired, perform dynamic balance processing on the impeller;

[0075] After the impeller blade 110 is repaired, the impeller is dynamically balanced to improve the operation performance of the impeller and the overall stability of the equipment.

[0076] The repair of the casing 120 includes the following steps:

[0077] S200: Determine the radius and width of the casing 120;

[0078] It can be understood that the radius R and the width size b of the casing 120 are measured according to the drawing of the fan casing 120.

[0079] S210: According to the radius and width of the casing 120, a plurality of second lining plates 300 are made;

[0080] It can be understood that the length of the second lining plate 300 can be 1 / 6-1 / 2 of the circumference of the casing 120, and can be 1 / 6, 1 / 5, 1 / 4, 1 / 3 or 1 / 2. The width of the first lining plate 200 is smaller than the width of the casing 120, that is, the edge of the first lining plate 200 is reserved for welding.

[0081] S220: The second lining plate 300 is sequentially welded to the casing 120; until the worn part of the casing 120 is repaired.

[0082] It can be understood that the second lining plate 300 is welded to the worn part or the whole area of the casing 120 to ensure that the worn part of the casing 120 is repaired.

[0083] The repair of the inlet 130 includes the following steps:

[0084] S300: The inlet 130 is sequentially sprayed with a resin ceramic bottom layer, a resin ceramic transition layer, and a resin ceramic wear-resistant layer.

[0085] In the repair of the blade 110, the first lining plate 200 is repaired by splicing and welding, and the dynamic balance control system is used in the repair process of the blade 110 to ensure the balance of the repaired blade 110. The service life and operation stability of the repaired impeller are significantly improved. In the repair of the casing 120, the second lining plate 300 is repaired by welding, which reduces the system stress. In the repair of the inlet 130, the resin ceramic is sprayed to repair the wear resistance, which solves the wear resistance problem of the inlet 130 with large curvature points.

[0086] In some embodiments, in the repair of the impeller blade 110, the first backing plate 200 is provided with a plurality of first welding holes; the plurality of first welding holes are located in the middle of the first backing plate 200. The first welding hole can be a circular hole, an oval hole or a square hole. In some embodiments, the first welding hole is a circular hole, which is convenient to process, and the stress distribution of the edge of the circular hole is uniform, which can effectively avoid stress concentration, thereby improving the structural strength and reliability. In some embodiments, the diameter of the first welding hole is 20 mm.

[0087] In some embodiments, the width of the first backing plate 200 is smaller than the width of the blade 110; the width of the first backing plate 200 can be 16-20 mm smaller than the width of the blade 110, and 8-10 mm gaps are reserved on both sides as welding positions, and the welding height is kept uniform. In some embodiments, the width of the first backing plate 200 can be 16 mm, 18 mm or 20 mm smaller than the width of the blade 110, and the distance between the edge of the first backing plate 200 and the edge of the blade 110 is 8 mm, 9 mm or 10 mm.

[0088] In some embodiments, the first backing plate 200 is a wear-resistant composite plate. The material of the first backing plate 200 can be CCrSiMnNbNiV-A. Although the wear-resistant composite plate material of the first backing plate 200 has good wear resistance, it is difficult to process into a curved surface due to its high hardness, so a plurality of first backing plates 200 are spliced for repair.

[0089] In some embodiments, the length of the first backing plate 200 ranges from 100 mm to 200 mm, and can be 100 mm, 120 mm, 130 mm, 150 mm, 160 mm, 180 mm or 200 mm. The distance between the two adjacent first welding holes is 1 / 3-1 / 2 of the length of the first backing plate 200, and the distance between the two adjacent first welding holes is 1 / 3, 5 / 12 or 1 / 2 of the length of the first backing plate 200.

[0090] In some embodiments, in the repair of the impeller blade 110, the weight accuracy of the first backing plate 200 located at the same position of each blade 110 is ±3 g. That is, the weight range of the first backing plate 200 located at the same position of each blade 110 can be up and down 3 g based on the nominal weight. Specifically, the first backing plate 200 can be weighed, and if the weight of the first backing plate 200 exceeds ±3 g, polishing can be used to ensure that the weight of the first backing plate 200 located at the same position of each blade 110 is close to equal. Thus, the weight deviation of the repaired blade 110 is small, which better ensures the balance of the blade 110.

[0091] In some embodiments, in the repair of the impeller blades 110, the length of the welding rod used in each welding of the first backing plate 200 to the blade 110 is recorded. The length of the welding rod is used to control the weight deviation of each first backing plate 200 on the same position of each blade 110, and the weight deviation of each backing plate after welding is ≤0.5g.

[0092] In some embodiments, in the repair of the impeller blades 110, welding more than one first backing plate 200 to each blade 110 in sequence specifically includes: welding more than one first backing plate 200 to the blade 110 in sequence from the outer edge to the center axis position of the blade 110. It can be understood that the position of the outer edge of the blade 110 is better determined than the position of the center axis, and the outer edge of the blade 110 is more easily worn than the blade 110 near the center axis, so welding in sequence from the outer edge to the center axis position of the blade 110 can more conveniently select a reference point, facilitate welding, and ensure that the position of each blade 110 remains consistent. For example, the position of the edge of the blade 110 by 10mm can be selected as the reference point, and the first first backing plate 200 is welded from this position, and then the second first backing plate 200 is welded in sequence from the outer edge to the center axis position of the blade 110.

[0093] In some embodiments, the outer edge of the blade 110 is more severely worn than the position near the center axis, for example, the length of the blade 110 is 500mm, and the length of the first backing plate 200 can be 150mm. If the range of wear of the blade 110 is 400mm extending from the edge of the blade 110 to the center axis, then only 3 first backing plates 200 need to be laid on each blade 110, which can repair the worn area of the blade 110.

[0094] In some embodiments, in the repair of the casing 120, the second backing plate 300 has a structure of being narrow at the top and wide at the bottom in the thickness direction. The curvature of the casing 120 is larger than that of the blade 110, and the narrow-top-wide-bottom backing plate structure can better disperse and withstand stress when stressed, similar to the stability of the trapezoidal structure, which can more effectively avoid deformation or damage caused by excessive local stress compared to a rectangular plate welded into a circular arc shape.

[0095] In some embodiments, in the repair of the casing 120, the edge of the second backing plate 300 is inclined downward, and adjacent two second backing plates 300 are spliced to form a V-shaped groove. Adjacent two second backing plates 300 form a V-shaped structure, which can better disperse stress and reduce stress concentration after being welded into an arc shape. This helps to improve the overall stability and durability of the structure and reduce the risk of cracks and fractures caused by stress concentration. In addition, the V-shaped structure can reduce welding deformation during the welding process, which helps to improve the welding quality and reduce stress concentration and structural damage caused by welding deformation.

[0096] In some embodiments, in the repair of the casing 120, the second lining plate 300 is a wear-resistant composite plate, and the material is CCrSiMnNbNiV-A; since the wear-resistant composite plate has good wear resistance, but the hardness is high, it is difficult to process into a curved surface, so a plurality of second lining plates 300 are spliced for repair.

[0097] In some embodiments, the length of the second lining plate 300 is 200mm-500mm, which can be 200mm, 230mm, 280mm, 350mm, 380mm, 4200mm or 500mm. The distance between the two adjacent second welding holes is 1 / 3-1 / 2 of the length of the second lining plate 300, and the distance between the two adjacent second welding holes is 1 / 3, 5 / 12 or 1 / 2 of the length of the second lining plate 300.

[0098] In some embodiments, the width of the second lining plate 300 is smaller than the width of the casing 120; the width of the second lining plate 300 can be 16-20mm smaller than the width of the casing 120, and 8-10mm gap is reserved on both sides as the welding position, and the welding height is kept uniform. In some embodiments, the width of the second lining plate 300 can be 16mm, 18mm or 20mm smaller than the width of the blade 110, and the distance between the edge of the corresponding second lining plate 300 and the edge of the casing 120 is 8mm, 9mm or 10mm.

[0099] In some embodiments, the second lining plate 300 is provided with a plurality of second welding holes. The plurality of second welding holes are located in the middle of the second lining plate 300. The second welding hole can be a circular hole, an oval hole or a square hole. In some embodiments, the second welding hole is a circular hole, which is convenient to process, and the stress distribution is uniform at the edge of the circular hole, which can effectively avoid stress concentration, thereby improving the structural strength and reliability. In some embodiments, the diameter of the second welding hole is 20mm.

[0100] In some embodiments, the distance between the two adjacent second welding holes of the second lining plate 300 is greater than the distance between the two adjacent first welding holes of the first lining plate 200. Compared with the casing 120, the blade 110 needs to rotate during use, so the first lining plate 200 welded on the blade 110 has more and denser welding points to ensure the firmness of the first lining plate 200 welded on the blade 110. The casing 120 is in a static state during use, so compared with the first lining plate 200 welded on the blade 110, the second lining plate 300 welded on the casing 120 has sparser welding points, which only needs to ensure the firmness.

[0101] In some embodiments, in the repair of the casing 120, the repair of the casing 120 is a local wear repair or a whole repair. Since there is no process of dynamic balance treatment, the whole of the casing 120 can be repaired if time permits, or the local of the casing 120 can be repaired if time does not permit, to ensure the efficiency and quality of the repair of the casing 120.

[0102] In some embodiments, in the repair of the air inlet 130, the air inlet 130 is sequentially sprayed with a resin ceramic bottom layer, a resin ceramic transition layer and a resin ceramic wear-resistant layer, and the resin ceramic bottom layer, the resin ceramic transition layer and the resin ceramic wear-resistant layer are all composed of silicon carbide, epoxy resin, nano-alumina and curing agent flux.

[0103] The spraying bottom layer includes the following mass fraction of chemical components: 15-25wt% of silicon carbide, 45-55wt% of epoxy resin and 4-6wt% of nano-alumina, and the rest is the content of curing agent flux.

[0104] The transition layer includes the following mass fraction of chemical components: 30-35wt% of silicon carbide, 25-35wt% of epoxy resin and 7-8wt% of nano-alumina, and the rest is the content of curing agent flux.

[0105] The wear-resistant layer includes the following mass fraction of chemical components: 40-45wt% of silicon carbide, 15-20wt% of epoxy resin and 9-10wt% of nano-alumina, and the rest is the content of curing agent flux.

[0106] In some embodiments, the spraying bottom layer includes the following mass fraction of chemical components: 20wt% of silicon carbide, 50wt% of epoxy resin, 5wt% of nano-alumina and the content of curing agent flux; the transition layer includes the following mass fraction of chemical components: 20wt% of silicon carbide, 50wt% of epoxy resin, 5wt% of nano-alumina and the content of curing agent flux; and the wear-resistant layer includes the following mass fraction of chemical components: 20wt% of silicon carbide, 50wt% of epoxy resin, 5wt% of nano-alumina and the content of curing agent flux.

[0107] Therefore, the spraying bottom layer, transition layer and wear-resistant layer are sprayed on the air inlet 130, and the component of silicon carbide increases from the bottom layer to the wear-resistant layer, which can improve the strength and ensure the wear resistance. The epoxy resin decreases (50%→30%→15%), balances the toughness and hardness; the nano-alumina increases (5%→8%→10%), enhances the density and thermal shock resistance of the coating. By setting different proportions of the bottom layer, the transition layer and the wear-resistant layer, the coating realizes gradient transition from toughness to hardness.

[0108] In some embodiments, the repairing of the air inlet 130 further comprises the following steps:

[0109] A primer is sprayed on the air inlet 130, wherein the spraying pressure is 0.3 MPa, the thickness is 0.5 mm, and after the spraying is completed, an electric arc lamp is used for heating and curing for 1-3 hours, and the heating temperature is 80-120°C. The spraying pressure of 0.3 MPa can make the coating spray out in a relatively uniform mist, and form a good coating on the surface of the sprayed object. If the pressure is too high, the coating may be over-atomized, resulting in waste of the coating, and the coating may be too thin and uneven. If the pressure is too low, the coating atomization effect is poor, the coating thickness is not up to standard, and even defects such as sagging may occur. The thickness of the primer is 0.5 mm, and the primer can provide good protection. The curing time of 1-3 hours ensures that the coating can be fully cured, which can be 1 hour, 2 hours or 3 hours.

[0110] A transition layer is sprayed on the air inlet 130, wherein the spraying pressure is 0.4 MPa, the thickness is 1 mm, and after the spraying is completed, an electric arc lamp is used for heating and curing for 0.5-2 hours, and the heating temperature is 150-200°C. The spraying pressure of the transition layer is 0.4 MPa, which is slightly higher than the conventional coating spraying pressure, which helps the coating to cover the surface of the substrate more uniformly and form a dense coating. The thickness of 1 mm is relatively thicker than the conventional coating, which can provide better bonding performance and protection performance, and provide a more reliable substrate for the adhesion of the subsequent coating. The curing temperature and time are higher and shorter than the conventional coating curing conditions, because the transition layer needs to be cured quickly at a higher temperature to form a transition layer with high strength and adhesion. The temperature range of 150-200°C can make the chemical reaction in the transition layer coating proceed quickly, ensuring that the coating reaches the ideal curing state in a short time.

[0111] A wear-resistant layer is sprayed on the air inlet 130, wherein the spraying pressure is 0.5 MPa, and the thickness is 1.5-2 mm. The spraying pressure of the surface wear-resistant coating is 0.5 MPa, which can make the coating spray out in a finer and more uniform mist, ensuring that the coating can better cover the surface of the substrate and form a uniform and dense coating. The coating thickness is 1.5-2 mm, which is relatively thick, providing sufficient wear resistance to cope with various wear environments and prolonging the service life of the coating.

[0112] Therefore, by setting different proportions of the primer, the transition layer and the wear-resistant layer, a gradient transition of the coating from toughness to hardness is achieved. The application of resin ceramic spraying technology for multi-layer wear-resistant repair realizes the gradient transition from toughness to hardness by adjusting the material proportion of each layer, which enhances the wear resistance, density and thermal shock resistance of the coating.

[0113] Therefore, the impeller can be repaired in wear resistance without disassembling the impeller, greatly reducing the repair difficulty and shortening the repair period. The wear-resistant composite plate splicing and welding repair blade 110 and the shell 120 can obviously improve the wear resistance of the fan, and the service life of the blade 110 can be increased from 1.5 years to more than 5 years. The resin ceramic spraying scheme of the air inlet 130 solves the wear problem of the air inlet 130 and other large curvature points.

[0114] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature therebetween. Moreover, the first feature "above", "over" and "on" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0115] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0116] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0117] In addition, in the present application, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically defined.

[0118] While the embodiments of the present application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the present application, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for repairing wear on a wind turbine, characterized in that, The repair includes at least one of the impeller blade, the casing and the air inlet; The repair of the impeller blade includes the following steps: Determine the length and width of the impeller blade; According to the length and width of the impeller blade, a plurality of first lining plates are made; One or more first lining plates are sequentially welded to one of the blades; The same number of first lining plates are sequentially welded to each of the other blades until all the blades are welded with the same number of first lining plates; After the repair of the impeller blade, the dynamic balance of the impeller is processed; The repair of the casing includes the following steps: Determine the radius and width of the casing; According to the radius and width of the casing, a plurality of second lining plates are made; The second lining plate is sequentially welded to the casing until the worn part of the casing is repaired; The repair of the air inlet includes the following steps: The air inlet is sequentially sprayed with a resin ceramic bottom layer, a resin ceramic transition layer and a resin ceramic wear-resistant layer.

2. The method of claim 1, wherein, In the repair of the impeller blade, the first lining plate is provided with a plurality of first welding holes; And / or, the width of the first lining plate is less than the width of the blade; And / or, the first lining plate is a wear-resistant composite plate.

3. The method of claim 1, wherein, In the repair of the impeller blade, the weight accuracy of the first lining plate at the same position of each blade is ±3g.

4. The method of claim 1-3, wherein, In the repair of the impeller blade, the first lining plate is sequentially welded to one of the blades. In the repair of the casing, the second lining plate is narrow at the top and wide at the bottom in the thickness direction.

5. The method of claim 1, wherein, In the repair of the casing, the edge of the second lining plate is inclined downward, and the adjacent two second lining plates form a V-shaped groove.

6. The method of claim 5, wherein, In the repair of the casing, the second lining plate is provided with a plurality of second welding holes; 7. The method of claim 5 or 6, wherein, And / or, the width of the second lining plate is less than the width of the casing; And / or, the second lining plate is a wear-resistant composite plate. In the repair of the casing, the repair of the casing is local wear repair or overall repair.

8. The method of claim 5 or 6, wherein, In the repair of the air inlet, the air inlet is sequentially sprayed with a resin ceramic bottom layer, a resin ceramic transition layer and a resin ceramic wear-resistant layer, and the resin ceramic bottom layer, the resin ceramic transition layer and the resin ceramic wear-resistant layer are composed of silicon carbide, epoxy resin, nano alumina and curing agent flux; 9. The method of claim 1, wherein, The spraying bottom layer includes the following mass fraction of chemical components: 15-25wt% of silicon carbide, 45-55wt% of epoxy resin and 4-6wt% of nano alumina, and the rest is the content of curing agent flux; The transition layer includes the following mass fraction of chemical components: 30-35wt% of silicon carbide, 25-35wt% of epoxy resin and 7-8wt% of nano alumina, and the rest is the content of curing agent flux; The wear-resistant layer includes the following mass fraction of chemical components: 40-45wt% of silicon carbide, 15-20wt% of epoxy resin and 9-10wt% of nano alumina, and the rest is the content of curing agent flux. In the repair of the air inlet, the following steps are further included:

10. The method of claim 9, wherein, ​ Spraying a primer on the air inlet position, wherein the spraying pressure is 0.3 MPa, the thickness is 0.5 mm, and after the spraying, arc lamp is used for heating and curing for 1-3 h, and the heating temperature is 80-120 ℃; Spraying a transition layer on the air inlet position, wherein the spraying pressure is 0.4 MPa, the thickness is 1 mm, and after the spraying, arc lamp is used for heating and curing for 0.5-2 h, and the heating temperature is 150-200 ℃; Spraying a wear-resistant layer on the air inlet position, wherein the spraying pressure is 0.5 MPa, and the thickness is 1.5-2 mm.

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