Zinc-aluminum-magnesium steel suitable for photovoltaic shock absorber, manufacturing process therefor, and photovoltaic shock absorber

Abstract

The present application relates to the technical field of plating, and in particular to a zinc-aluminum-magnesium steel suitable for a photovoltaic shock absorber, a manufacturing process therefor, and a photovoltaic shock absorber. The zinc-aluminum-magnesium steel comprises the following components in parts by mass: 1-3 parts of aluminum, 1-3 parts of magnesium, and 1-3 parts of zinc. The present application has the effect that metal workpieces coated with zinc-magnesium-aluminum plating manufactured by the present application have stronger corrosion resistance and stronger wear resistance.

Description

A zinc-aluminum-magnesium steel suitable for photovoltaic vibration dampers, its manufacturing process, and the photovoltaic vibration damper itself. Technical Field

[0001] This application relates to the field of coating technology, and in particular to a zinc-aluminum-magnesium steel suitable for photovoltaic dampers, its preparation process, and the photovoltaic damper itself. Background Technology

[0002] Zinc-aluminum-magnesium steel sheet refers to steel sheet with a zinc-aluminum-magnesium coating. Steel silos, hardware machinery, and other fields often require steel sheets with high corrosion resistance. The traditional technology involves galvanizing the steel sheet, resulting in ultra-thick zinc-coated pure zinc steel sheets. Ultra-thick zinc-coated pure zinc steel sheets with a zinc coating thickness of 800g / m² can have a service life of up to 30 years. However, the coating of ultra-thick zinc-coated pure zinc steel sheets is usually prepared by hot-dip galvanizing, which is difficult and costly to produce due to the excessive thickness of the coating. In contrast, zinc-aluminum-magnesium steel sheets, with a coating thickness of only 275g / m², can achieve a service life of over 30 years. The reduced coating thickness makes production easier and the cost lower than that of ultra-thick zinc-coated pure zinc steel sheets. Summary of the Invention

[0003] To address the issues of poor corrosion resistance and easy wear caused by applying anti-rust paint to metal workpieces in traditional processes, this application provides a zinc-aluminum-magnesium steel suitable for photovoltaic vibration dampers, its preparation process, and a photovoltaic vibration damper.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A zinc-aluminum-magnesium steel suitable for photovoltaic vibration dampers comprises the following components in parts by weight:

[0006] 1-3 parts aluminum;

[0007] 1-3 parts magnesium;

[0008] Zinc 1-3 parts.

[0009] Through the above technical solutions, zinc-aluminum-magnesium steel, as a coating material for metal surfaces, has gained widespread application. Due to its strong corrosion resistance, zinc-aluminum-magnesium steel, when applied to metal surfaces, enhances the weather resistance of metal workpieces. Compared to the traditional method of applying anti-rust paint to metal workpieces, zinc-aluminum-magnesium steel offers stronger wear resistance and reduces the likelihood of corrosion caused by damage to the anti-rust paint. When zinc-aluminum-magnesium steel is damaged, the magnesium phase in it migrates to the damaged area and oxidizes, forming a dense oxide film that continues to protect the metal workpiece, significantly extending the protection time. Furthermore, zinc-aluminum-magnesium steel has a silvery-white metallic luster, providing better reflectivity than traditional dark anti-rust paint, resulting in lower temperatures under sunlight and better protection of the workpiece. In addition, as a metallic material, zinc-aluminum-magnesium steel has good ductility and plasticity, allowing it to adapt to various metal workpiece shapes.

[0010] In zinc-aluminum-magnesium alloys, zinc, being a relatively reactive metal, forms a galvanic cell when it comes into contact with the steel plate, which significantly slows down the corrosion rate of the steel plate. Furthermore, the aluminum and magnesium in the zinc-aluminum-magnesium steel plate form a dense oxide film on the surface of the steel plate after oxidation, which isolates the steel plate from the oxidant and thus slows down the corrosion rate of the steel plate.

[0011] In this invention, the zinc-aluminum-magnesium steel also includes a manganese component.

[0012] Through the above technical solutions and multiple experiments conducted by operators, it was found that the addition of manganese to zinc-magnesium-aluminum steel significantly improves its physical and chemical properties, especially its wear resistance. The addition of manganese to zinc-magnesium-aluminum steel causes a phase transformation, expanding the austenite region and raising the critical temperature, allowing the material to remain stable at high temperatures. Simultaneously, the addition of manganese lowers the martensitic transformation temperature and improves the hardenability of the material. Furthermore, the addition of manganese makes the mixing of the various metal phases in the alloy more uniform, reducing the occurrence of agglomeration.

[0013] In this invention, the content of the manganese component is 0.5-5 parts.

[0014] Through the above technical solutions and multiple experiments conducted by operators, it was found that when the manganese content in zinc-magnesium-aluminum steel is 0.5-5 parts, the physical and chemical properties of zinc-magnesium-aluminum steel are significantly improved, especially the wear resistance.

[0015] A method for preparing zinc-aluminum-magnesium steel suitable for photovoltaic vibration dampers includes the following steps:

[0016] S1: Zinc, aluminum, magnesium, manganese and other components are added to a smelting furnace in proportion and melted to obtain a hot-dip liquid;

[0017] S2. Anneal the steel plate, controlling the annealing temperature to obtain the steel matrix;

[0018] S3. The steel substrate obtained in step S2 is stamped and formed according to requirements to obtain a metal workpiece.

[0019] S4. The hot-dip liquid obtained in step S1 is applied to the steel substrate for hot-dip galvanizing. After slight cooling, a second stamping is performed to obtain a metal workpiece with zinc-aluminum-magnesium coating.

[0020] In this invention, the traditional process for producing zinc-magnesium-aluminum steel-coated metal workpieces typically involves applying a zinc-magnesium-aluminum hot-dip immersion liquid to a steel plate and then processing the coated steel plate into the desired workpiece. This method is prone to damage to the zinc-magnesium-aluminum coating during processing, resulting in a low yield. In this technical solution, the metal workpiece is first shaped, then the zinc-magnesium-aluminum coating is applied to it. After slight cooling to maintain the coating on the surface of the workpiece, a second stamping process is performed, ensuring a tight bond between the coating and the workpiece, thus improving the product yield.

[0021] In this invention, the temperature of the hot immersion liquid in step S1 is 400-600℃, and the temperature after cooling in step S1 is 200-400℃.

[0022] Through the above technical solution and multiple experiments conducted by operators, it was found that the temperature of the hot immersion liquid in step S1 is 400-600℃, and the temperature after cooling in step S1 is 200-400℃, which is more suitable for processing metal workpieces.

[0023] In this invention, the hot-dip plating time in step S3 is 30-60 seconds.

[0024] Through the above technical solution and multiple experiments conducted by operators, it was found that a hot-dip galvanizing time of 30-60 seconds is more suitable in step S3. When the hot-dip galvanizing time is too short, it is easy to cause incomplete coating of zinc-magnesium-aluminum hot-dip galvanizing solution.

[0025] A photovoltaic vibration damper includes an oil reservoir cylinder, one end of which is provided with an oil reservoir cylinder cover. A working cylinder is coaxially disposed inside the oil reservoir cylinder, and a connecting rod is coaxially slidably connected inside the working cylinder. The connecting rod extends out of the oil reservoir cylinder in a direction away from the oil reservoir cylinder cover. A piston is provided at the end of the connecting rod near the oil reservoir cylinder cover. A dust cover is coaxially fitted over the oil reservoir cylinder, and a dust discharge cover is provided at the end of the dust cover away from the oil reservoir cylinder cover. Joint bearings are provided at the ends of the connecting rod and the oil reservoir cylinder cover that are away from each other. The oil reservoir cylinder, oil reservoir cylinder cover, working cylinder, connecting rod, dust cover, and dust discharge cover are all made of zinc-aluminum-magnesium steel with a coating modification.

[0026] Through the above technical solution, the oil reservoir, oil reservoir cover, working cylinder, and connecting rod are all coated with zinc-aluminum-magnesium steel, making them less susceptible to corrosion during use and significantly extending the service life of the equipment. A dust cover is fitted onto the outer wall of the oil reservoir steel, and one end of the dust cover is fixed with a dust cover cap. The dust cover protects the oil reservoir. Compared with the traditional method of applying anti-rust paint, the dust cover coated with zinc-aluminum-magnesium steel has a longer service life. At the same time, when the dust cover is corroded, it can be replaced instead of replacing the entire equipment, resulting in lower costs.

[0027] In this invention, a fixing ring is coaxially provided on the inner side wall of the dust cover, and a limiting ring is coaxially provided on one end of the dust cover facing the dust cover, and the limiting ring and the fixing ring are locked together.

[0028] Through the above technical solution, the limiting ring and the fixing ring play a role in restricting the dust cover, reducing the occurrence of the dust cover being inserted too much into the dust cover, thereby facilitating the disassembly and separation of the dust cover and the dust cover.

[0029] In this invention, an indicator groove is coaxially formed on the outer wall of the dust cover, and the position of the indicator groove corresponds to that of the fixing ring.

[0030] With the above technical solution, the position of the fixing ring can be easily observed by the operator by the position of the indicator groove, thus making it easier to select a dust cover of appropriate size.

[0031] In this invention, the dust cover and the dust cover cap are connected by a rolling process.

[0032] The above technical solution utilizes a roll forming process, which, compared to traditional welding, facilitates the connection and disassembly of dust covers and dustproof covers.

[0033] The beneficial effects of the synthesis method described in this invention are mainly as follows:

[0034] 1. Zinc-aluminum-magnesium steel is a coating material used on metal surfaces. Due to its strong corrosion resistance, zinc-aluminum-magnesium steel can enhance the weather resistance of metal workpieces when applied to metal surfaces.

[0035] 2. In this technical solution, the zinc-magnesium-aluminum coating is first applied to the metal workpiece after processing and forming, and then slightly cooled to keep the zinc-magnesium-aluminum coating on the surface of the metal workpiece. Then, a second stamping is performed to make the zinc-magnesium-aluminum coating adhere tightly to the metal workpiece, thereby improving the product yield.

[0036] 3. Install a dust cover on the outer wall of the oil storage steel. Fix one end of the dust cover with a dust cover cap. The dust cover protects the oil storage cylinder. Compared with the traditional method of applying anti-rust paint, the dust cover with zinc-aluminum-magnesium steel coating has a longer service life. At the same time, when the dust cover is corroded, the dust cover can be replaced instead of replacing the entire equipment, which is cheaper. Attached Figure Description

[0037] Figure 1 is a cross-sectional view of a photovoltaic vibration damper according to an embodiment of this application.

[0038] Figure 2 is a structural schematic diagram of the connection method of the dust cover and dust cover cap of a photovoltaic shock absorber according to an embodiment of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Oil reservoir; 11. Oil reservoir cover; 2. Working cylinder; 3. Connecting rod; 31. Piston; 4. Dust cover; 41. Retaining ring; 42. Indicator groove; 5. Dust cover; 51. Limiting ring; 6. Joint bearing. Detailed Implementation

[0040] The present invention will be further described below through specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0041] The present application will be further described in detail below with reference to Figures 1-2.

[0042] This application discloses a photovoltaic vibration damper. Referring to Figures 1 and 2, the photovoltaic vibration damper includes a cylindrical oil reservoir 1. One end of the oil reservoir 1 is open and sealed by an oil reservoir steel cover. A working cylinder 2 is coaxially mounted inside the oil reservoir steel cover. A connecting rod 3 is coaxially slidably connected inside the working cylinder 2. The connecting rod 3 extends out of the oil reservoir 1 in a direction away from the oil reservoir cover 11. A piston 31 is fixed at one end of the connecting rod 3 near the oil reservoir cover 11. When the connecting rod 3 is subjected to an external force, the connecting rod 3 drives the piston 31 to move inside the working cylinder 2. The oil in the working cylinder 2 plays a role in damping vibration.

[0043] The oil reservoir 1 is coaxially fitted with a cylindrical dust cover 4. The end of the dust cover 4 away from the oil reservoir cover 11 is sealed by a dust discharge cover. A fixing ring 41 is coaxially fixed on the inner wall of the dust cover 4. An indicator groove 42 is coaxially opened on the outer wall of the dust cover 4. The position of the indicator groove 42 corresponds to that of the fixing ring 41. A limit ring 51 is coaxially fixed on the end of the dust cover 5 facing the dust cover 4. The limit ring 51 and the fixing ring 41 are locked together. The dust cover 4 and the dust cover 5 are connected by a rolling process.

[0044] Referring to Figure 1, the connecting rod 3 and the oil reservoir cover 11 are each equipped with a spherical bearing 6 for connecting with other workpieces at their far ends. The oil reservoir 1, the oil reservoir cover 11, the working cylinder 2, the connecting rod 3, the dust cover 4, and the dust cover 5 are all coated with zinc-aluminum-magnesium steel.

[0045] The implementation principle of a photovoltaic shock absorber in this application embodiment is as follows: the photovoltaic shock absorber is connected to other workpieces through the joint bearings 6 at both ends. When the joint bearings 6 are subjected to force, the force drives the piston 31 to move through the connecting rod 3. When the piston 31 moves in the working cylinder 2, the oil in the working cylinder 2 slows down the movement of the piston 31, thereby achieving the shock absorption effect.

[0046] The oil reservoir 1, oil reservoir cover 11, working cylinder 2, and connecting rod 3 are all coated with zinc-aluminum-magnesium steel, making them less susceptible to corrosion during use and significantly extending the service life of the equipment. A dust cover 4 is fitted onto the outer wall of the oil reservoir steel, and one end of the dust cover 4 is fixed with a dust cover cap 5. The dust cover 4 protects the oil reservoir 1 and reduces the entry of dust from the air into the oil reservoir 1 and working cylinder 2. The dust cover 4 and dust cover cap 5 are modified by coating with zinc-aluminum-magnesium steel. Compared with the traditional method of applying anti-rust paint, the dust cover 4 with zinc-aluminum-magnesium steel coating has a longer service life. At the same time, when the dust cover 4 is corroded, the dust cover 4 can be replaced instead of replacing the entire equipment, which is more cost-effective.

[0047] The dust cover 4 and the dust cover 5 are connected by a roll forming process, which causes less damage to the zinc-aluminum-magnesium coating compared to the traditional welding process, thus making the equipment more corrosion resistant.

[0048] The present application will be further described in detail below with reference to various embodiments and comparative examples.

[0049] Example 1:

[0050] Each zinc-magnesium-aluminum coating is prepared from the following components in parts by weight:

[0051] The difference between Examples 2-5 and Comparative Examples 1-6 and Example 1 lies in the composition of the zinc-magnesium-aluminum coating, as shown in the table below:

[0052] The difference between Comparative Example 7 and Example 1 is that the zinc-magnesium-aluminum coated metal workpiece is prepared using a conventional process, the steps of which are shown below:

[0053] S1: Zinc, aluminum, magnesium, manganese and other components are added to a smelting furnace in proportion and melted to obtain a hot-dip liquid;

[0054] S2. Anneal the steel plate, controlling the annealing temperature to obtain the steel matrix;

[0055] S3. The hot-dip liquid obtained in step S1 is coated onto the steel substrate for hot-dip galvanizing to obtain zinc-aluminum-magnesium coated steel sheet.

[0056] S4. The zinc-aluminum-magnesium coated steel sheet obtained in step S2 is stamped and formed according to requirements.

[0057] The difference between Comparative Example 8 and Example 1 is that Comparative Example 8 is a metal workpiece coated with traditional anti-rust paint.

[0058] Detection methods

[0059] After the zinc-magnesium-aluminum coatings prepared in each embodiment and comparative example were applied to the surface of the metal workpiece, various performance tests were conducted.

[0060] Heat resistance

[0061] Each metal workpiece was placed in an open, sunny place at noon for 2 hours to expose it to direct sunlight, and the surface temperature of each metal workpiece was tested.

[0062] abrasion resistance

[0063] Each metal workpiece was ground with a 2000-grit grinding wheel for 30 seconds, and the degree of wear on each metal workpiece was observed.

[0064] Corrosion resistance

[0065] Each metal workpiece was placed in a sealed chamber, and salt spray was introduced into the chamber. The workpieces were stored for 6 hours, 24 hours, and 48 hours, and the degree of corrosion was observed. The degree of corrosion was scored from 0 to 10, with higher scores indicating greater corrosion.

[0066] The salt spray test adopts the following standard: Salt spray test (ISO 9227, JIS Z2371, ASTM B117) 5% NaCl, 35℃.

[0067] Destructive testing: Two scratches were made on the zinc-aluminum-magnesium coating of each metal workpiece using a knife. One scratch completely destroyed the zinc-aluminum-magnesium coating and exposed the metal workpiece, while the other scratch partially destroyed the zinc-aluminum-magnesium coating. Then, corrosion resistance tests were performed on each metal workpiece.

[0068] The test results are shown in the table below:

[0069] Conclusion: As can be seen from the data in Example 1 and Comparative Example 8 above, the metal workpiece coated with the zinc-magnesium-aluminum coating prepared in this application has a lower surface temperature under long-term exposure to sunlight, which plays a good role in protecting the equipment. This is because zinc-magnesium-aluminum steel has a silvery-white metallic luster, which has a better reflective effect than traditional dark anti-rust paint. Traditional dark anti-rust paint absorbs heat more easily under sunlight, resulting in a lower temperature of the metal workpiece coated with zinc-magnesium-aluminum coating under sunlight, which reduces the damage of high temperature to the electronic components inside the metal workpiece.

[0070] Conclusion: As can be seen from the data in Example 1 and Comparative Example 7 above, the preparation process of this application has a higher yield compared with the traditional process. This is because the traditional process for producing zinc-magnesium-aluminum coated metal workpieces generally involves coating the steel plate with zinc-magnesium-aluminum hot-dip molten liquid and then processing the coated steel plate into the required workpiece. This method is prone to damage to the zinc-magnesium-aluminum coating at the bending points of the steel plate during processing, resulting in a low yield. In this technical solution, by first processing and shaping the metal workpiece, then applying the zinc-magnesium-aluminum coating onto the metal workpiece, slightly cooling it to keep the zinc-magnesium-aluminum coating on the surface of the metal workpiece, and then performing a second stamping, the zinc-magnesium-aluminum coating is tightly bonded to the metal workpiece, reducing the damage to the zinc-magnesium-aluminum coating when bending the steel plate and improving the product yield.

[0071] Conclusion: Data from Examples 1-3 and Comparative Examples 1-3 in the table above show that the addition of manganese to the zinc-aluminum-magnesium coating significantly improves wear resistance. This is because the addition of manganese to the zinc-aluminum-magnesium steel causes a phase transformation, expanding the austenitic region and increasing the critical temperature, allowing the metal to remain stable at high temperatures. Simultaneously, the addition of manganese lowers the martensitic transformation temperature and improves hardenability. Furthermore, the addition of manganese makes the mixing of the various metal phases in the alloy more uniform, reducing agglomeration and thus improving the overall wear resistance of the zinc-aluminum-magnesium coating. The improvement in wear resistance is most significant when the manganese content is between 0.05 and 0.5 parts. When the content exceeds 0.5 parts, further addition of manganese has little effect. Therefore, a manganese content of 0.05-0.5 parts is suitable for synthesizing the zinc-aluminum-magnesium coating in this application.

[0072] Conclusion: Based on the data from Examples 1, 4, 5, and 6 and Comparative Examples 4-6 in the table above, the zinc-magnesium-aluminum coating prepared with a composition of 1-3 parts aluminum, 1-3 parts magnesium, and 1-3 parts zinc exhibits good corrosion resistance. The optimal ratio of aluminum:magnesium:zinc is 2:1:3, resulting in the highest corrosion resistance. When the proportions of aluminum, magnesium, and zinc are each greater than 3 parts, the corrosion resistance of the zinc-magnesium-aluminum coating decreases significantly. This is because zinc, being a relatively reactive metal in the zinc-aluminum-magnesium alloy, forms a galvanic cell when in contact with the steel plate, significantly slowing down the corrosion rate. The aluminum and magnesium in the zinc-aluminum-magnesium steel plate... After oxidation, a dense oxide film forms on the surface of the steel plate, isolating the steel plate from the oxidant and thus slowing down the corrosion rate. When the zinc content is too high, the oxide film formed after the oxidation of aluminum and magnesium is less, making it difficult to cover the entire zinc-aluminum-magnesium coating surface. This results in an excessively fast oxidation rate of zinc, leading to a shorter overall corrosion resistance time for the zinc-aluminum-magnesium coating. When there is too much aluminum and magnesium, although a dense protective film will form, the current severe air pollution means that aluminum oxide will react with acid rain with a low pH, destroying the oxide film and reducing the corrosion resistance of the metal workpiece. Therefore, a suitable ratio of zinc, aluminum, and magnesium is needed to ensure that the prepared zinc-aluminum-magnesium coating has good corrosion resistance.

[0073] Conclusion: As can be seen from the data in Example 1 and Comparative Example 8 above, the zinc-aluminum-magnesium coating prepared in this application can maintain a long corrosion resistance effect even when the zinc-aluminum-magnesium coating is damaged after being applied to the surface of the metal workpiece. In contrast, the existing technology uses anti-rust paint to protect the metal workpiece. When the anti-rust paint is damaged, the metal workpiece is severely corroded. This is because when the zinc-aluminum-magnesium steel is damaged, the magnesium phase in the zinc-aluminum-magnesium steel will move to the damaged area and oxidize, forming a dense oxide film, which continues to protect the metal workpiece, thus greatly extending the protection time. Traditional anti-rust paint does not have this function. Therefore, the zinc-aluminum-magnesium coating prepared in this application has a stronger corrosion resistance effect.

[0074] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A zinc-aluminum-magnesium steel suitable for photovoltaic shock absorbers, characterized by, The components include the following parts by mass: aluminum 1-3 parts; magnesium 1-3 parts; zinc 1-3 parts.

2. A Zinc-Aluminium-Magnesium Steel suitable for photovoltaic shock absorbers according to claim 1, characterized by the fact that: The zinc-aluminum-magnesium steel further comprises a manganese component.

3. A Zinc-Aluminium-Magnesium Steel suitable for photovoltaic shock absorbers according to claim 2, characterized by the fact that: The content of the manganese component is 0.05-0.5 parts.

4. A method for the production of a zinc-aluminum-magnesium steel suitable for photovoltaic shock absorbers as claimed in claims 1-3, characterized by the fact that, The method comprises the following steps: S1: melting the components such as zinc, aluminum, magnesium and manganese into a smelting furnace to obtain a hot dipping liquid; S2: annealing the steel plate to control the annealing temperature to obtain a steel matrix; S3: stamping the steel matrix obtained in step S2 according to requirements to obtain a metal workpiece; S4: coating the hot dipping liquid obtained in step S1 on the steel matrix to perform hot dipping plating, slightly cooling and then performing secondary stamping to obtain a metal workpiece coated with a zinc-aluminum-magnesium plating layer.

5. A method of producing a zinc-aluminum-magnesium steel suitable for use in a photovoltaic shock absorber according to claim 3, characterized in that: The temperature of the hot dipping liquid in step S1 is 400-600℃, and the temperature of the cooled liquid in step S1 is 200-400℃.

6. A method of producing a zinc-aluminum-magnesium steel suitable for use in a photovoltaic shock absorber according to claim 3, characterized in that: The hot dipping plating time in step S3 is 30-60S.

7. A photovoltaic shock absorber coated with a zinc-aluminum-magnesium steel prepared as claimed in any one of claims 4-6, characterized by: The oil storage cylinder (1) is provided with an oil storage cylinder cover (11) at one end, a working cylinder (2) is coaxially arranged in the oil storage cylinder (1), a connecting rod (3) is coaxially and slidingly connected in the working cylinder (2), the connecting rod (3) extends out of the oil storage cylinder (1) in a direction away from the oil storage cylinder cover (11), a piston (31) is arranged at one end of the connecting rod (3) close to the oil storage cylinder cover (11), a dust cover (4) is coaxially arranged outside the oil storage cylinder (1), a dust cover cover is arranged at one end of the dust cover (4) away from the oil storage cylinder cover (11), a joint bearing (6) is arranged at one end of the connecting rod (3) and the oil storage cylinder cover (11) away from each other, and the oil storage cylinder (1), the oil storage cylinder cover (11), the working cylinder (2), the connecting rod (3), the dust cover (4) and the dust cover cover (5) are all made of zinc-aluminum-magnesium steel.

8. A photovoltaic shock absorber according to claim 7, wherein: A fixing ring (41) is coaxially arranged on the inner side wall of the dust cover (4), and a limiting ring (51) is coaxially arranged at one end of the dust cover cover (5) facing the dust cover (4).

9. A photovoltaic shock absorber according to claim 8, wherein: An indicating groove (42) is coaxially arranged on the outer wall of the dust cover (4), and the position of the indicating groove (42) corresponds to the position of the fixing ring (41).

10. A photovoltaic shock absorber according to claim 9, wherein: The dust cover (4) and the dust cover cover (5) are connected through a rolling process.

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