High-corrosion-resistance photovoltaic support purline and electroplating forming device thereof

Abstract

The invention discloses a high-corrosion-resistance photovoltaic support purline, the surface of the purline is plated with a magnesium-aluminum-zinc alloy coating, and the magnesium-aluminum-zinc alloy coating is covered with an anti-erosion coating. The electroplating forming device comprises an electroplating bath body, and a backflow cavity in a bath cavity leads to a liquid supply cavity through a circulating pipeline and a circulating pump; at least two steel belt guide wheels are arranged in the tank cavity of the electroplating tank body, a plurality of anode inserting plates are oppositely arranged between the two steel belt guide wheels, a steel belt channel is formed between the opposite anode inserting plates, and three metal anodes of magnesium, aluminum and zinc which are mutually insulated are inserted on the anode inserting plates; dragging compression roller pairs are arranged at the front end and the rear end of the electroplating bath body, and forming compression roller pairs are arranged at the output ends of the dragging compression roller pairs at the rear end of the electroplating bath body. An air supply pipe is mounted at the bottom of the tank cavity of the electroplating tank body. The bracket purline not only has higher corrosion resistance and erosion resistance, but also is beneficial to realizing light weight of the photovoltaic bracket, and the electroplating forming device can realize continuous electroplating production and is environment-friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of solar photovoltaic power generation brackets, and particularly to a purlin in a solar photovoltaic bracket with high corrosion resistance. The present invention also relates to an electroplating device for manufacturing and forming the above purlin. Background Art

[0002] A photovoltaic bracket is a special device in a solar photovoltaic power generation system for supporting, fixing, and rotating photovoltaic modules, playing the role of the "skeleton" of the entire photovoltaic power station. A purlin of a photovoltaic bracket is a component connecting the photovoltaic module panel and the bracket support structure. Through the purlin, the weight and wind load of the photovoltaic panel can be transmitted to the support frame of the bracket system, and the purlin must ensure that the photovoltaic panel fits tightly on the bracket.

[0003] Due to the special position and function of the purlin in the photovoltaic bracket system, it does not require the purlin to have the same load-bearing capacity as the bracket support. However, currently, the purlins in the photovoltaic bracket system often use the same profile as the bracket support, which actually causes redundancy in the strength and stiffness of the purlin profile, not only increasing the construction cost of the photovoltaic power station, resulting in waste of raw materials, but also increasing the weight of the photovoltaic bracket, which is not conducive to the lightweight of the photovoltaic bracket.

[0004] The purlin, like the photovoltaic bracket, is also exposed to the outdoor environment, not only being eroded by natural climates such as wind, sun, rain, and ultraviolet rays, but also being scoured, worn, and damaged by sand, strong wind currents, and dust; especially when the photovoltaic power generation station is in a humid, highly saline-alkali atmosphere, and desert environment, the corrosion resistance and erosion resistance of the photovoltaic bracket are particularly important, and these index performances directly affect the stable and durable operation and service life of the photovoltaic bracket.

[0005] The applicant applied for and was authorized an invention patent "A Photovoltaic Bracket with Erosion Resistance and Ultraviolet Resistance, a Coating Composition and a Preparation Method Thereof" on December 30, 2022, with the patent number: 202211742278.7. This invention patent improves the surface wear resistance, erosion resistance, and ultraviolet resistance of the bracket by coating an erosion-resistant and ultraviolet-resistant coating composition on the surface of the bracket profile. Although the photovoltaic bracket of this invention patent has obtained good surface erosion resistance, its corrosion resistance is insufficient in actual operation. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a highly corrosion-resistant purlin for a photovoltaic bracket, which not only has high corrosion resistance and erosion resistance, but also is conducive to realizing the lightweight of the photovoltaic bracket and reducing the cost of the photovoltaic bracket. The present invention also provides an electroplating forming device for manufacturing and forming the purlin of the bracket.

[0007] To solve the above technical problems, the highly corrosion-resistant photovoltaic support purlin of the present invention includes a purlin for installing photovoltaic modules, and a magnesium-aluminum-zinc alloy coating is plated on the surface of the purlin, and an erosion-resistant coating is covered on the magnesium-aluminum-zinc alloy coating.

[0008] In the photovoltaic support purlin structure of the present invention, since a magnesium-aluminum-zinc alloy coating is plated on the surface of the purlin, the magnesium-aluminum-zinc alloy coating has excellent anti-corrosion performance and can be used for a long time in a harsh environment. Moreover, it has obvious advantages in terms of weather resistance, formability, etc. The support profile with such a coating can also be directly cut and used without additional surface treatment such as painting, and the on-site installation is more rapid. Also, since an erosion-resistant coating is covered on the magnesium-aluminum-zinc alloy coating, the erosion-resistant coating not only protects the magnesium-aluminum-zinc alloy coating, but also effectively enhances the resistance to scouring and abrasion by strong airflows, sandstorms, etc. and the ultraviolet resistance. The magnesium-aluminum-zinc alloy coating and the erosion-resistant coating constitute a double protection structure of corrosion resistance and erosion resistance, and can maintain the stability, durability and long life of the support in a more harsh and complex environment. When the photovoltaic support purlin is manufactured by a steel strip extrusion molding process, lightweight design can be achieved under the condition of meeting the strength requirements, thereby reducing the cost of the support structure.

[0009] The electroplating forming device for manufacturing the above support purlin of the present invention includes an electroplating tank body. Liquid supply chamber partitions and return chamber partitions are respectively fixedly installed at the front and rear ends of the tank cavity of the electroplating tank body. Liquid supply holes are provided on the liquid supply chamber partition, and return holes are provided on the return chamber partition; a liquid supply chamber is formed by the liquid supply chamber partition and the tank wall of the electroplating tank body, and a return chamber is formed by the return chamber partition and the tank wall of the electroplating tank body. The return chamber leads to the liquid supply chamber through a circulation pipeline and a circulation pump;

[0010] At least two steel strip guide wheels are further installed in the tank cavity of the electroplating tank body. A plurality of anode insertion plates are relatively arranged between the two steel strip guide wheels, and a steel strip channel is formed between the opposite anode insertion plates. Three mutually insulated metal anodes of magnesium, aluminum and zinc are inserted on the anode insertion plates;

[0011] Drag roller pairs are arranged at both the front and rear ends of the electroplating tank body, and a forming roller pair is arranged at the output end of the drag roller pair at the rear end of the electroplating tank body.

[0012] In the above electroplating forming device, since the reflux chamber partition and the electroplating tank body enclose a reflux chamber, and the liquid supply chamber partition and the electroplating tank body enclose a liquid supply chamber, and the reflux chamber leads to the liquid supply chamber through a circulation pipeline and a circulation pump, it enables the electroplating solution transported in a cycle to be transported into the electroplating tank chamber of the electroplating tank body after filling the liquid supply chamber, thus effectively overcoming the liquid supply vortex and liquid supply dead angle formed by the centralized transportation of the transportation pipe orifice, forming a stable and uniform circulating liquid flow field in the electroplating tank chamber, and ensuring the uniform distribution of metal ions in the plating tank; at the same time, both the liquid supply chamber partition and the reflux chamber partition adopt an orifice plate structure to form decentralized liquid supply and decentralized reflux, and also make the flow velocity of the electroplating solution circulating and flowing in each cross-section of the plating tank consistent, ensuring that the electroplating solution flows through each surface to be plated of the photovoltaic support profile at the same flow rate and flow velocity, ensuring the uniform deposition of metal ions on the workpiece to form a uniform and consistent coating, and ensuring the electroplating quality.

[0013] Also, since a steel strip channel is formed between two opposite anode insertion plates installed in the tank chamber of the electroplating tank body, and three metal anodes made of magnesium, aluminum, and zinc, which are insulated from each other, are inserted on the anode insertion plates. On the one hand, when direct current power is applied to all three metal anodes of magnesium, aluminum, and zinc, a magnesium-aluminum-zinc alloy coating with high corrosion resistance can be formed on the support profile that serves as the cathode of the workpiece to be plated, and by controlling the current and voltage of the three metal anodes, the mass fraction ratio of metal elements in the electroplating solution can be adjusted to form a stable coating with better, more uniform, and denser coating quality; when current is applied to two of the metal anodes, a two-metal alloy coating is formed on the support cathode material; when current is applied to one metal anode, a single-metal coating is formed on the support profile; enabling the electroplating tank to achieve different metal or metal alloy coatings according to the electroplating process requirements of the workpiece to be plated, greatly increasing the flexibility of the process; on the other hand, the steel strip passes through the steel strip channel, not only forming continuous electroplating and greatly improving the electroplating efficiency, but also being able to form more uniform metal ions in the electroplating channel, which is beneficial to improving the coating quality.

[0014] Also, since dragging pressure roller pairs are provided at both the front and rear ends of the electroplating tank body, especially a forming pressure roller pair is provided at the output end of the rear dragging pressure roller pair. The coordinated action of the dragging pressure roller pair and the forming pressure roller pair not only protects the continuous electroplating operation of the electroplating tank on the steel strip to be plated, but also enables the steel strip electroplated by the electroplating tank to form a purlin product with a specific cross-sectional shape under the rolling and extrusion action of the forming pressure roller pair, constituting an integrated electroplating and forming production equipment.

[0015] Furthermore, an air supply pipe is installed at the bottom of the tank chamber of the electroplating tank body, and a number of air supply holes with different orientations are provided on the pipe wall of the air supply pipe. By inputting corresponding gases, the effective concentration of the electroplating solution can be stabilized; both avoiding defects such as rough coating crystals and decreased bonding force caused by increased concentration and fast deposition speed; and avoiding problems such as slow deposition speed, missing plating, or too thin coating caused by too low concentration.

[0016] Furthermore, a heater and / or agitator is installed in the liquid supply chamber formed by the liquid supply chamber partition and the electroplating tank body. The heater includes an upper oil pillow and a lower oil pillow filled with heat-conducting oil, and a connecting pipe is connected between the upper oil pillow and the lower oil pillow, and a plurality of heat sinks are installed on the connecting pipe. The heater and the agitator are installed in the liquid supply chamber. On the one hand, the temperature of the electroplating solution can be adjusted and controlled to improve and stabilize the electroplating efficiency; on the other hand, the electroplating solution can be stirred and homogenized to ensure uniformity of the plating layer.

[0017] Furthermore, a vapor collecting hood is installed at the slot opening of the electroplating tank body, which can avoid leakage and pollution of volatile gas of the electroplating solution and can also recycle and reuse the volatile gas of the electroplating solution.

[0018] Preferably, four steel belt guide wheels are installed in the tank cavity of the electroplating tank body along the dragging path of the steel belt, wherein two of the steel belt guide wheels are located at both ends of the steel belt channel formed by the opposite anode plug-in plates; the three metal anodes of magnesium, aluminum and zinc plugged on the oppositely installed anode plug-in plates face the steel belt channel, and the steel belt to be plated can be accurately guided to the electroplating solution and the steel belt channel in the tank cavity of the electroplating tank.

[0019] Preferably, a strip cleaning device and a strip drying device are provided between the dragging roller pair at the rear end of the electroplating tank and the electroplating tank. A steel strip roll is provided in front of the dragging roller pair at the front end of the electroplating tank, and a steel strip cleaning device is provided between the steel strip roll and the dragging roller pair. The actual requirements of the steel strip electroplating process are met.

[0020] Preferably, the through-porosity of the liquid supply chamber partition and the reflux chamber partition is 60-70%, so as to ensure uniform liquid supply and circulation reflux of the electroplating solution in the electroplating tank.

[0021] Preferably, the forming roller pair includes a convex roller and a concave roller rolling against each other, and the convex roller or the concave roller is connected to the forming reducer by transmission. The drag roller pair includes an active roller and a driven roller rolling against each other, and the active roller is connected to the drag reducer by transmission. The active drive of the forming roller pair and the drag roller pair ensures the continuous electroplating and forming of the steel strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 It is the installation structure diagram of the photovoltaic support purlin of the present invention;

[0024] Figure 2 yes Figure 1 Front view of the center purlin;

[0025] Figure 3 yes Figure 2 A-A section in the middle;

[0026] Figure 4 is Figure 3 the enlarged view of part Ⅰ of ;

[0027] Figure 5 is the structural schematic diagram of the electroplating forming device for the bracket purlin of the present invention;

[0028] Figure 6 is Figure 5 the structural schematic diagram of the forming roll pair in ;

[0029] Figure 7 is Figure 5 the structural schematic diagram of the dragging roll pair in ;

[0030] Figure 8 is Figure 5 the structural schematic diagram of the steel strip guide wheel in ;

[0031] Figure 9 is Figure 5 the sectional view B - B in ;

[0032] Figure 10 is Figure 5 the assembly drawing of the metal anode and the anode mounting plate in ;

[0033] Figure 11 is Figure 10 the sectional view C - C of ;

[0034] Figure 12 is Figure 5 the sectional view D - D in ;

[0035] Figure 13 is Figure 12 the sectional structural diagram of the air supply pipe in ;

[0036] Figure 14 is Figure 5 the structural diagram of the heater in .

[0037] In the figure, 1 is a photovoltaic module, 2 is a purlin, 3 is a magnesium-aluminum-zinc alloy coating, 4 is an erosion-resistant coating. 5 is an electroplating tank body, 6 is a liquid supply chamber partition, 7 is a liquid supply hole, 8 are steel belt guide wheels, 801 is a guide roller, 802 is a guide roller bearing bush, 803 is a guide roller shaft, 804 is a guide roller seat, 9 is an air supply pipe, 10 is an anode socket, 11 is an anode insertion plate, 12 is a metal anode, 13 is a circulation pump, 14 is a circulation pipeline, 15 is a return chamber partition, 16 is a return hole, 17 is a finished purlin, 18 is a forming press roller, 181 is a convex press roller, 182 is a convex press roller shaft, 183 is a forming reduction gear, 184 is a concave press roller shaft, 185 is a concave press roller, 186 is a forming press roller seat, 19 is a dragging press roller pair, 191 is a driving roller, 192 is a driving roller shaft, 193 is a dragging reduction gear, 194 is a driven roller shaft, 195 is a driven roller, 196 is a dragging press roller seat, 20 is a plated belt drying device, 21 is a plated belt cleaning device, 22 is a steam collecting hood, 23 is a steel belt, 24 is a steel belt cleaning device, 25 is a steel belt coil, 26 is a steel belt coil support, 27 is a heater, 271 is an oil pillow on top, 272 is a connecting channel, 273 is a heat sink, 274 is an oil pillow at the bottom, 275 is a heating component, 28 is a stirrer, 29 is a main air supply pipe, 30 is an air supply hole. Detailed implementation manners

[0038] As Figure 1 、 Figure 2 and Figure 3 shown, the photovoltaic module 1 is fixedly installed on two parallel purlins 2, and the purlin 2 is a C-shaped steel formed by extruding a steel belt. As Figure 4 shown, a magnesium-aluminum-zinc alloy coating 3 is plated on the surface of the body of the purlin 2. The magnesium-aluminum-zinc alloy coating 3 has fine zinc pattern textures formed by crystallization. The synergistic effect of various metal elements in the alloy coating reduces the surface coating consumption rate of the plated steel product and has excellent corrosion resistance. An erosion-resistant coating 4 is coated on the magnesium-aluminum-zinc alloy coating 3. The erosion-resistant coating 4 is coated with an erosion-resistant and ultraviolet-resistant coating composition in the invention patent "An Erosion-Resistant and Ultraviolet-Resistant Photovoltaic Bracket, Coating Composition and Its Preparation Method" (Patent No.: 202211742278.7) applied and authorized by the applicant on December 30, 2022. The magnesium-aluminum-zinc alloy coating 3 on the surface of the body of the purlin 2 and the erosion-resistant coating 4 on this coating constitute a double protection for the purlin.

[0039] As Figure 5The purlin electroplating forming device shown includes an electroplating tank body 5. During electroplating, the tank cavity of the electroplating tank body 5 is filled with electroplating solution. In the embodiment of the present invention, the electroplating solution is hydrochloric acid. At the front and rear ends of the tank cavity of the electroplating tank body 5, a liquid supply cavity partition 6 and a return cavity partition 15 are fixedly installed respectively. The electroplating tank body 5, the liquid supply cavity partition 6, and the return cavity partition 15 are all made of polypropylene polymer material, which not only has good corrosion resistance and electrical insulation performance, but also can effectively protect the surface coating of the purlin to be plated.

[0040] A number of liquid supply holes 7 are evenly distributed on the liquid supply cavity partition 6. The liquid supply cavity partition 6 and the tank wall at the corresponding end of the electroplating tank body 5 enclose a liquid supply cavity. A heater 27 and a stirrer 28 are also installed in the liquid supply cavity. The motor of the stirrer 28 is installed outside the upper tank wall, and the output end of the motor extends into the liquid supply cavity and is fixedly installed with a stirring paddle. A number of return holes 16 are also evenly distributed on the return cavity partition 15. The return cavity partition 15 and the tank wall at the corresponding end of the electroplating tank body 5 enclose a return cavity. The return cavity is connected to the input port of a circulation pump 13 through a circulation pipeline 14, and the output port of the circulation pump 13 is connected to the liquid supply cavity through the circulation pipeline 14.

[0041] In the tank cavity of the electroplating tank body 5, two layers of anode insertion plates 11 are installed at intervals. Each layer of anode insertion plate 11 includes a number of anode insertion plate 11 units. The two layers of anode insertion plates 11 are arranged at a distance to form a steel belt channel. As Figure 9 shown, both side ends of the anode insertion plate 11 are placed on the anode insertion plate seat 10. The anode insertion plate seat 10 is fixedly installed on the tank wall of the electroplating tank body 5 on the corresponding side. The anode insertion plate seat 10 is also made of polymer material. In the steel belt channel formed between the two layers of anode insertion plates 11, steel belt guide wheels 8 are provided at both ends of the steel belt channel. The two steel belt guide wheels 8 are installed on the tank bottom plate through corresponding mounting seats. The two steel belt guide wheels 8 guide the steel belt 23 into the steel belt channel for electroplating. At the position of the tank openings at the front and rear ends of the electroplating tank body 5, two steel belt guide wheels 8 are also installed respectively. The two steel belt guide wheels 8 guide the steel belt 23 into the plating tank cavity and guide the steel belt into the steel belt channel. At the bottom position of the tank depth of the electroplating tank body 5, an air supply pipe 9 is also installed to supplement hydrogen chloride gas into the electroplating solution to maintain the hydrochloric acid concentration.

[0042] A gas collecting hood 22 is also provided on the notch of the electroplating tank 5. The gas collecting hood 22 is used to collect acid mist to prevent the acid mist from leaking out and polluting the environment, and the acid mist gas can be reused. A steel strip roll 25 is provided on the front side of the drag roller pair 19 at the front end of the electroplating tank 5. The steel strip roll 25 is rotatably supported on the steel strip roll support 26, and a steel strip cleaning device 24 is provided between the steel strip roll 25 and the drag roller pair 19. A plated strip cleaning device 21 and a plated strip drying device 20 are provided between the drag roller pair 19 at the rear end of the electroplating tank 5 and the electroplating tank 5. The steel strip cleaning device 24, the plated strip cleaning device 21 and the plated strip drying device 20 are all commonly used devices for electroplating using steel materials; and according to the actual electroplating process, corresponding processes and process equipment can also be added or optimized in the electroplating process path of the steel strip. A forming roller pair 18 is also provided at the output end of the drag roller pair 19 at the rear end of the electroplating tank 5. During electroplating, the steel strip 23 to be plated on the steel strip coil 25 passes through the steel strip cleaning device 24, the dragging roller pair 19, and the steel strip guide wheel 8 in sequence and enters the electroplating steel strip channel. The steel strip output from the electroplating steel strip channel passes through the steel strip guide wheel 8, the plated strip cleaning device 21, and the plated strip drying device 20 and enters the dragging roller pair 19. The plated steel strip that has passed the dragging roller pair 19 is input into the forming roller pair 18, and the forming roller pair 18 outputs the extruded purlin finished product 17.

[0043] like Figure 6 As shown, the forming roller 18 includes a convex roller 181 and a concave roller 185, which roll against each other to form a purlin extrusion forming groove. The convex roller 181 is fixedly mounted on the convex roller shaft 182, and the convex roller shaft 182 is rotatably supported on the forming roller seat 186 through a sliding bearing and is transmission-connected to the forming reducer 183. The concave roller 185 is fixedly mounted on the concave roller shaft 184, and the concave roller 184 is also rotatably supported on the forming roller seat 186 through a sliding bearing.

[0044] like Figure 7 As shown, the dragging roller pair 19 includes a driving roller 191 and a driven roller 195 rolling against each other, the driving roller 191 is rotatably supported on a driving roller shaft 192, the driving roller shaft 192 is transmission-connected to a dragging reducer 193, the driven roller 195 is rotatably supported on a driven roller shaft 194, and the driving roller shaft 192 and the driven roller shaft 194 are fixedly supported on the dragging roller shaft 194. The driving roller shaft 192 and the driven roller shaft 194 are fixedly supported on a dragging roller seat 196.

[0045] like Figure 8 As shown, the guide roller 801 of the steel belt guide roller 8 is rotatably supported on the guide roller shaft 803 through the guide roller bearing 802, and the guide roller shaft 803 is fixedly mounted on the guide roller seat 804.

[0046] like Figure 10 , Figure 11As shown, three metal anode slots are provided on each anode mounting plate 11 unit, and the anode mounting plate 11 is also made of polypropylene polymer material. Three mutually insulated metal anodes 12 made of magnesium, aluminum, and zinc are respectively inserted into the three metal anode slots of the anode mounting plate 11. Passing direct current through different metal anodes generates corresponding metal ions in the electroplating solution, and the amount of metal ions in the electroplating solution can be adjusted by controlling the current magnitude.

[0047] As Figure 12 shown, a number of liquid supply holes 7 are evenly distributed on the liquid supply chamber partition plate 6. Two gas supply pipes 9 are arranged in parallel at the bottom of the electroplating tank body 5, and the two gas supply pipes 9 are both connected to the main gas supply pipe 29. A number of return holes 16 are evenly distributed on the return chamber partition plate 15. The through-hole rate of the liquid supply chamber partition plate 6 and the return chamber partition plate 15 is 65%, preferably between 60 - 70%. The through-hole rate is the ratio of the sum of the areas of the through-holes on the corresponding plate surface to the corresponding plate surface.

[0048] As Figure 13 shown, the gas supply pipe 13 is a circular pipe. A number of gas supply holes 30 are evenly distributed on the upper half circumference of the pipe wall of the gas supply pipe 13. There are five gas supply holes 30 on the half circumference pipe wall of the gas supply pipe in the same cross-section, and the gas supply holes 30 in the same cross-section are distributed along different radial directions, thus forming different orientations.

[0049] When using hydrochloric acid as the electroplating solution, temperature control is relatively important, and both reaction efficiency and safety need to be considered. Although a high temperature will accelerate the reaction rate, acid mist pollution and equipment corrosion will also occur due to the volatilization of hydrochloric acid; while a too low temperature will reduce the electroplating efficiency. Therefore, a heater 27 is installed in the liquid supply chamber of the electroplating tank body 5, and a temperature sensor is also installed in the tank cavity of the electroplating tank body 27 to control the working temperature of the electroplating solution at 25°C - 30°C, which is more reasonable. In order to prevent the acid mist generated by the volatilization of hydrochloric acid from leaking out and causing environmental pollution, a steam collecting hood 22 is hermetically installed at the upper opening of the tank cavity of the electroplating tank body 27, and the acid mist is centrally treated or treated for reuse through the steam collecting hood 22.

[0050] As Figure 14 shown, the heater 27 includes an upper oil pillow 271 and a lower oil pillow 274. The upper oil pillow 271 and the lower oil pillow 274 are interconnected through a number of connecting pipes 272. The upper oil pillow 271, the lower oil pillow 274, and the connecting pipes 272 are filled with heat-conducting oil to ensure uniform heating. A number of heat dissipation fins 273 are installed on the outer pipe wall of the connecting pipes 272 to improve the heat dissipation speed and increase the heat exchange area. A heating component 275 is inserted into the lower oil pillow 274, and the heating component 275 uses a common electric heating component.

[0051] Some preferred embodiments of the present invention are given above, but the present invention is not limited to the above embodiments. Many improvements and transformations can be made without departing from the basic principles of the present invention, and these improvements and transformations all fall within the protection scope of the present invention.

Claims

1. A highly corrosion-resistant purlin for a photovoltaic support, comprising a purlin (2) for installing a photovoltaic module (1), characterized in that: The surface of the purlin (2) is plated with a magnesium-aluminum-zinc alloy coating (3), and an erosion-resistant coating (4) is covered on the magnesium-aluminum-zinc alloy coating (3).

2. An electroplating forming device for manufacturing the bracket purlin described in claim 1, including an electroplating tank body (5), characterized in that: Liquid supply chamber partitions (6) and return flow chamber partitions (15) are fixedly installed at the front and rear ends of the cavity of the electroplating tank body (5) respectively. Liquid supply holes (7) are arranged on the liquid supply chamber partitions (6), and return flow holes (16) are arranged on the return flow chamber partitions (15); The liquid supply chamber partition (6) and the tank wall of the electroplating tank body (5) enclose a liquid supply chamber, and the return flow chamber partition (15) and the tank wall of the electroplating tank body (5) enclose a return flow chamber. This return flow chamber leads to the liquid supply chamber through a circulation pipeline (14) and a circulation pump (13); At least two steel belt guide wheels (8) are also installed in the cavity of the electroplating tank body (5). A number of anode insertion plates (11) are relatively arranged between the two steel belt guide wheels (8). A steel belt channel is formed between the opposite anode insertion plates (11). Three mutually insulated metal anodes (12) of magnesium, aluminum, and zinc are inserted on the anode insertion plates (11); Drag roller pairs (19) are arranged at both the front and rear ends of the electroplating tank body (5), and a forming roller pair (18) is arranged at the output end of the drag roller pair (19) at the rear end of the electroplating tank body (5).

3. The electroplating forming device according to claim 2, wherein: An air supply pipe (9) is installed at the bottom of the cavity of the electroplating tank body (5), and a number of air supply holes (28) with different orientations are arranged on the pipe wall of the air supply pipe (9).

4. The electroplating forming device according to claim 2, wherein: A heater (27) and / or a stirrer (28) are installed in the liquid supply chamber enclosed by the liquid supply chamber partition (6) and the electroplating tank body (5).

5. The electroplating forming device according to claim 4, wherein: The heater (27) includes an upper oil pillow (271) and a lower oil pillow (274) filled with heat-conducting oil. A connecting pipe (272) is communicated between the upper oil pillow (271) and the lower oil pillow (274), and a number of heat dissipation fins (273) are installed on the connecting pipe (272).

6. The electroplating forming device according to claim 2, characterized in that: A steam collecting hood (22) is installed at the cavity opening of the electroplating tank body (5).

7. The electroplating forming device according to claim 2, characterized in that: Four steel belt guide wheels (8) are installed in the cavity of the electroplating tank body (5) along the dragging path of the steel belt (23). Two of the steel belt guide wheels (8) are located at both ends of the steel belt channel formed by the relatively installed anode insertion plates (11); The three metal anodes (12) of magnesium, aluminum, and zinc inserted on each anode insertion plate (11) unit face the steel belt channel.

8. The electroplating forming device according to claim 2, wherein: A plating belt cleaning device (21) and a plating belt drying device (20) are also arranged between the drag roller pair (19) at the rear end of the electroplating tank body (5) and the electroplating tank body (5).

9. The electroplating forming device according to claim 2, wherein: A steel belt coil (25) is arranged on the front side of the drag roller pair (19) at the front end of the electroplating tank body (5), and a steel belt cleaning device (24) is arranged between the steel belt coil (25) and this drag roller pair (19).

10. The electroplating forming device according to claim 2, wherein: The through-hole rates of the liquid supply chamber partition (6) and the return flow chamber partition (15) are 60 - 70%.

11. The electroplating forming device according to claim 2, wherein: The forming press roller pair (18) includes a convex press roller (181) and a concave press roller (185) that roll against each other, and the convex press roller (181) or the concave press roller (185) is in driving connection with a forming speed reducer (183).

12. The electroplating forming device according to claim 2, characterized in that: The dragging press roller pair (19) includes a driving roller (191) and a driven roller (195) that roll against each other, and the driving roller (191) is in driving connection with a dragging speed reducer (193).

Images