Metal mesh coating spray method and system

Abstract

This invention relates to a method and system for spraying a metal mesh coating. The method establishes a calibration relationship between a calibrated spraying amount and a reduction in transparency value; plasma spraying is performed on a first side of the metal mesh workpiece according to a reference spraying amount, and the transparency value after spraying is detected; the allowable reduction in transparency value is determined based on the difference between this transparency value and a preset target transparency value; then, the spraying amount for the second side is determined according to the calibration relationship, and the spraying is completed. The system includes a rotary table, a clamping fixture, a plasma spraying device, a detection unit, and a control unit. The rotary table is used to switch the clamping fixture between a first-side spraying position, a detection position, and a second-side spraying position. The detection unit is used to detect the transparency value, and the control unit determines the second-side spraying amount based on the detection results. This invention enables the final transparency value after double-sided spraying to reach or approach a preset target transparency value, allowing the reaction medium to reach the surface of the functional coating through the mesh openings, thereby improving the electrochemical reaction efficiency of the metal mesh electrode.

Description

Technical Field

[0001] This invention relates to the field of coating spraying technology, and in particular to a method and system for spraying a metal mesh coating. Background Technology

[0002] Metal mesh, with its excellent electrical conductivity, large specific surface area, and ability to facilitate the passage of reaction media, is commonly used as a conductive substrate for electrodes. To endow metal mesh electrodes with corresponding electrochemical functions, functional coatings are typically formed on the surface of metal meshes, such as nickel meshes, using methods like plasma spraying. During the electrochemical reaction, the reaction media needs to pass through the mesh openings of the metal mesh to reach and contact the functional coating surface. Therefore, the permeability of the metal mesh after spraying affects the transmission of the reaction media and the degree to which the functional coating participates in the electrochemical reaction.

[0003] During the spraying process, spray particles are deposited on the surface of the metal wires and may accumulate at the intersections of the wires and the edges of the mesh openings. As the spray material gradually accumulates, the effective flow space of the mesh openings decreases accordingly. The permeability of the metal mesh reflects the flow capacity retained by the mesh openings after spraying. When the permeability is too low, the transmission of the reaction medium through the mesh openings to the surface of the functional coating is hindered, which is not conducive to the functional coating fully participating in the electrochemical reaction.

[0004] When performing double-sided spraying on metal mesh, existing technologies typically complete the spraying of both sides sequentially according to pre-set fixed spraying parameters. The coating formed by the first side spraying occupies part of the mesh's flow space, and the coating formed by the second side spraying further alters the flow state of the mesh. Due to the influence of the metal mesh's own condition and fluctuations in the spraying process, the actual reduction in transparency caused by the first side spraying may deviate from the expected amount; when the second side also uses fixed spraying parameters, the cumulative reduction in transparency caused by spraying on both sides is prone to deviate from the predetermined range.

[0005] Therefore, the final transparency value of the metal mesh after double-sided spraying is prone to deviating from the preset target transparency value. When the final transparency value is low, it indicates that the effective flow space of the mesh openings is smaller than expected, and the transmission of the reaction medium to the functional coating surface through the mesh openings is hindered. When the final transparency value is high, it indicates that the cumulative reduction in transparency value caused by double-sided spraying is less than expected, which may correspond to insufficient deposition or coverage of the functional coating, affecting the degree to which the functional coating participates in the electrochemical reaction. Therefore, both low and high final transparency values ​​may make it difficult for the metal mesh electrode to achieve the expected electrochemical reaction efficiency. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is that the existing technology sprays the two sides of the metal mesh sequentially according to the pre-set fixed spraying parameters. Due to the influence of the metal mesh's own state and the fluctuation of the spraying process, the final transparency value after double-sided spraying is easy to deviate from the preset target transparency value, which in turn affects the reaction medium from passing through the metal mesh pores and reaching the surface of the functional coating, which is not conducive to the metal mesh electrode obtaining the expected electrochemical reaction efficiency.

[0007] To solve the above-mentioned technical problems, the present invention provides a method for spraying a metal mesh coating, comprising: Establish a calibration relationship, which characterizes the relationship between multiple calibrated coating amounts and the corresponding reduction in transparency value; the reduction in transparency value is: the difference between the first transparency value of the first side of the same metal mesh calibration part after being coated with the reference coating amount and the second transparency value of its second side after being coated with the corresponding calibrated coating amount. Plasma spraying is performed on the first side of the metal mesh workpiece according to the reference spraying amount; the third transparency value of the metal mesh workpiece after spraying on the first side is detected. The difference between the third transparency value and the preset target transparency value is calculated to obtain the allowable reduction in transparency value; Based on the calibration relationship, determine the amount of second-side coating corresponding to the allowable reduction in transparency value; Plasma spraying is performed on the second side of the metal mesh workpiece according to the second side spraying amount.

[0008] In one embodiment of the present invention, the method for establishing the calibration relationship includes: Plasma spraying was performed on the first side of each metal mesh calibration component according to the reference spraying amount, and the first transparency value of each metal mesh calibration component was detected. Plasma spraying was performed on the second side of each metal mesh calibration component according to different calibration spraying amounts, and the second transparency value of each metal mesh calibration component was tested. Based on the first and second transparency values ​​of each metal mesh calibration component, the reduction in transparency value corresponding to different calibration coating amounts is obtained; Multiple calibration points are constructed using the specified coating amount as the abscissa and the corresponding reduction in transparency value as the ordinate. Linear interpolation is performed on adjacent calibration points in ascending order of the specified coating amount to establish a piecewise linear calibration relationship.

[0009] In one embodiment of the present invention, the first transparency value, the second transparency value, and the third transparency value are obtained by the following method: Clamp the metal mesh workpiece or metal mesh calibration piece so that the detection area of ​​the metal mesh workpiece or metal mesh calibration piece is exposed; The first side of the metal mesh workpiece or metal mesh calibration piece is made to communicate with the atmosphere, and a negative pressure cavity communicating with the detection area is formed on the second side of the metal mesh workpiece or metal mesh calibration piece; the periphery of the cavity opening of the negative pressure cavity is sealed so that gas enters the negative pressure cavity only through the detection area; The negative pressure chamber is evacuated, and the gas volume flow rate passing through the detection area and entering the negative pressure chamber from the first side of the metal mesh workpiece or metal mesh calibration piece is detected. The corresponding permeability value is determined based on the gas volume flow rate.

[0010] In one embodiment of the present invention, the negative pressure value in the negative pressure chamber is detected, and the air extraction volume is adjusted according to the negative pressure value so that the negative pressure value in the negative pressure chamber is kept within the same preset range during each permeability value detection.

[0011] In one embodiment of the present invention, each of the transparency values ​​is determined according to the ratio of the gas volume flow rate through the detection area of ​​the metal mesh workpiece or metal mesh calibration piece to the area of ​​the detection area, and satisfies: K=Q / A; Wherein, K is the permeability value, Q is the gas volume flow rate through the detection area, and A is the area of ​​the detection area.

[0012] In one embodiment of the present invention, before detecting the first transparency value, the second transparency value, or the third transparency value, the metal mesh workpiece or metal mesh calibration piece that has undergone corresponding plasma spraying is subjected to a preset cooling time, and cleaning gas is blown onto the metal mesh workpiece or metal mesh calibration piece to remove loose sprayed material adhering to the metal mesh workpiece or metal mesh calibration piece.

[0013] In a second aspect, the present invention also discloses a metal mesh coating spraying system, comprising: A clamping fixture includes a fixture plate, the fixture plate having a through window and positioning grooves and docking grooves on its opposite sides, the positioning grooves and the docking grooves being connected to the through window; the positioning grooves are used to position the metal mesh workpiece, and the through window corresponds to the detection area of ​​the metal mesh workpiece; A rotary table is used to drive the clamping fixture to rotate so that the positioning groove is opposite to the plasma spraying device, or the docking groove is opposite to the detection unit. The plasma spraying device; The detection unit includes a test housing, a linear drive mechanism, and an air extraction device; the test housing is provided with a test chamber, a detection port, and an air extraction port, both of which are connected to the test chamber; the linear drive mechanism is used to drive the detection port to seal or separate from the docking groove; the air extraction port is connected to the air extraction device via a gas volume flow meter. The control unit, connected to the plasma spraying device and the gas volume flow meter, stores a calibration relationship between the calibrated spraying amount and the reduction in transparency value. The control unit determines the third transparency value of the first side of the metal mesh workpiece after spraying based on the gas volume flow rate, determines the second side spraying amount from the calibration relationship based on the difference between the third transparency value and the preset target transparency value, and controls the plasma spraying device to spray the second side of the metal mesh workpiece according to the second side spraying amount.

[0014] In one embodiment of the present invention, the edge of the clamping fixture is provided with a rotary cylinder, and the output end of the rotary cylinder is connected to a pressure head; the rotary cylinder is used to drive the pressure head to rotate and move toward the positioning groove, so as to press the metal mesh workpiece into the positioning groove.

[0015] In one embodiment of the present invention, the linear drive mechanism includes a cylinder, a pressure plate, a guide rod, and a spring; one end of the guide rod is connected to the test housing, and the other end is provided with a limiting part, and the middle part of the guide rod is provided with a stepped part; the pressure plate is slidably sleeved on the guide rod and located between the stepped part and the limiting part; the telescopic rod of the cylinder is connected to the pressure plate, and the spring is sleeved on the guide rod, with both ends abutting against the pressure plate and the stepped part respectively.

[0016] In one embodiment of the present invention, the detection unit further includes a negative pressure sensor, which is connected to the test chamber and the control unit; the control unit is also connected to the suction device and adjusts the suction volume of the suction device according to the detection result of the negative pressure sensor so that the negative pressure value in the test chamber is maintained within a preset range.

[0017] The technical solution of the present invention has the following advantages compared with the prior art: This invention, after coating the first side of a metal mesh workpiece according to a reference coating amount, detects its actual transparency value. The difference between this actual transparency value and a preset target transparency value determines the allowable reduction in transparency value on the second side. Then, based on a pre-established calibration relationship between the calibrated coating amount and the reduction in transparency value, the coating amount on the second side corresponding to this allowable reduction in transparency value is determined. Therefore, when the actual transparency value after coating the first side is relatively low, the allowable reduction in transparency value on the second side is small, and the determined coating amount on the second side is correspondingly reduced; when the actual transparency value after coating the first side is relatively high, the allowable reduction in transparency value on the second side is large, and the determined coating amount on the second side is correspondingly increased, thus matching the actual reduction in transparency value generated by coating the second side with the allowable reduction in transparency value.

[0018] This invention enables targeted adjustment of the coating amount on the second side of a metal mesh workpiece based on the actual transparency value after coating the first side. This reduces the risk of the final transparency value deviating from the preset target transparency value due to using a fixed coating amount on the second side, ensuring that the transparency value of the metal mesh workpiece after double-sided coating reaches or approaches the preset target transparency value. Consequently, the reaction medium can pass through the metal mesh openings and reach the surface of the functional coating as expected, improving the contact state between the reaction medium and the functional coating, thereby enhancing the electrochemical reaction efficiency of the metal mesh electrode. Attached Figure Description

[0019] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a partial structural schematic diagram of the metal mesh coating spraying system provided by the present invention; Figure 2 This is a schematic diagram of the detection unit provided by the present invention; Figure 3 This is a schematic diagram of the docking of the test housing and the clamping fixture provided by the present invention; Figure 4 This is a schematic diagram of the structure of the test housing provided by the present invention; Figure 5 This is a schematic diagram of the clamping fixture provided by the present invention; Figure 6 This is a schematic diagram of the structure of the jig plate provided by the present invention, showing the side where the positioning groove is located. Figure 7 This is a schematic diagram of the structure of the side where the docking groove of the fixture plate provided by the present invention is located; Figure 8 This is a flowchart of the metal mesh coating spraying method provided by the present invention; Figure 9 This is a schematic diagram illustrating the establishment of calibration relationships provided by the present invention; Figure 10 This is a flowchart of the method for obtaining the first transparency value, the second transparency value, and the third transparency value provided by the present invention; Figure 11 These are microscopic morphology photographs of comparative samples using fixed spraying parameters in existing technologies. Figure 12 These are microscopic images of samples from embodiments of the spraying method of the present invention.

[0021] Explanation of reference numerals in the accompanying drawings: 10. Clamping fixture; 11. Through window; 12. Positioning groove; 13. Docking groove; 14. Rotary cylinder; 15. Pressure head; 16. Fixture plate; 20. Rotary table; 21. Rotating table surface; 22. Rotary drive component; 40. Detection unit; 41. Test housing; 411. Test chamber; 412. Detection port; 413. Air extraction port; 414. Sealing ring; 42. Linear drive mechanism; 421. Cylinder; 422. Pressure plate; 423. Guide rod; 424. Spring; 425. Step portion; 426. Limiting portion; 70. Metal mesh workpiece. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0023] Example 1: Embodiment 1 of the present invention provides a metal mesh coating spraying system, which can adjust the amount of coating on the second side according to the actual transparency state of the metal mesh workpiece 70 after the first side is sprayed. In this embodiment, the metal mesh workpiece 70 (the workpiece to be coated) is always clamped in the same clamping fixture 10 during the first side spraying, transparency value detection, and second side spraying processes. The metal mesh workpiece 70 can be a nickel mesh.

[0024] like Figures 1 to 7 As shown, the system includes a clamping fixture 10, a rotary table 20, a plasma spraying device, a detection unit 40, and a control unit.

[0025] The rotary table 20 includes a horizontally arranged rotating platform 21 and a rotary drive 22 for driving the rotating platform 21 to rotate around a vertical axis. The rotary drive 22 can be a combination of a servo motor and a reduction mechanism, or it can be a rotary cylinder or other drive mechanism capable of driving the rotating platform 21 to rotate at a preset angle.

[0026] The clamping fixture 10 includes a fixture plate 16, which is vertically mounted on the rotating table 21, such that the surface of the fixture plate 16 is arranged in the vertical direction. When the rotation drive 22 drives the rotating table 21 to rotate, the fixture plate 16 rotates with the rotating table 21 around the vertical axis.

[0027] The fixture plate 16 has a through window 11 extending along its thickness, and positioning grooves 12 and docking grooves 13 on opposite sides of the through window 11. Both positioning grooves 12 and docking grooves 13 communicate with the through window 11, and their opening sizes are larger than the through window 11. The positioning groove 12 is used to accommodate and position the metal mesh workpiece 70, and the through window 11 corresponds to the detection area of ​​the metal mesh workpiece 70. The docking groove 13 is used for sealing and docking of the detection unit 40.

[0028] The bottom of the positioning groove 12 forms a positioning surface for supporting the metal mesh workpiece 70. The inner circumferential contour of the positioning groove 12 is adapted to the outer circumferential contour of the metal mesh workpiece 70 to restrict the movement of the metal mesh workpiece 70 along the surface of the fixture plate 16. After the metal mesh workpiece 70 is installed in the positioning groove 12, one side of it faces the space outside the positioning groove 12, and the other side faces the through window 11 and the docking groove 13.

[0029] The plasma spraying device is located outside the rotary table 20 and is used to perform plasma spraying on the metal mesh workpiece 70. The plasma spraying device adopts conventional equipment in this field, and its specific structure will not be described in detail here; the spraying amount can be controlled by adjusting at least one of the following spraying parameters: powder feeding rate, spraying speed, number of spray passes, and spraying time.

[0030] The rotary table 20 is used to rotate the clamping fixture 10, so that the first side of the metal mesh workpiece 70 faces the plasma spraying device, or the docking groove 13 faces the detection unit 40. After the transparency value detection is completed, the rotary table 20 continues to rotate the clamping fixture 10, so that the second side of the metal mesh workpiece 70 faces the plasma spraying device. During the second side spraying, the spraying material is sprayed onto the second side of the metal mesh workpiece 70 through the docking groove 13 and the through window 11.

[0031] Therefore, the metal mesh workpiece 70 can sequentially complete the first side spraying, transparency value detection and second side spraying under the same clamping state, reducing position changes caused by repeated clamping.

[0032] The detection unit 40 includes a test housing 41, a linear drive mechanism 42, an air extraction device, and a gas volume flow meter. The test housing 41 has a test chamber 411, and is equipped with a detection port 412 and an air extraction port 413, both communicating with the test chamber 411. The detection port 412 faces the clamping fixture 10, and the air extraction port 413 is connected to the air extraction device via the gas volume flow meter.

[0033] The linear drive mechanism 42 is used to move the test housing 41 toward or away from the clamping fixture 10. When the clamping fixture 10 rotates to the detection position, the linear drive mechanism 42 moves the test housing 41 toward the clamping fixture 10, so that the outer edge of the detection port 412 is sealed and connected with the bottom of the mating groove 13. At this time, the test cavity 411 is connected to the detection area of ​​the metal mesh workpiece 70 through the detection port 412, the mating groove 13 and the through window 11.

[0034] A sealing ring 414 may be provided on the outer edge of the detection port 412. When the detection port 412 is sealed and connected with the mating groove 13, the sealing ring 414 is pressed between the outer edge of the detection port 412 and the bottom of the mating groove 13. The sealing ring 414 may be made of rubber, silicone or other elastic sealing materials.

[0035] During testing, the side of the metal mesh workpiece 70 facing away from the test chamber 411 is open to the outside atmosphere. An air extraction device evacuates the test chamber 411 through the extraction port 413, creating a negative pressure inside. External gas passes through the testing area of ​​the metal mesh workpiece 70 and enters the test chamber 411 through the through window 11 and the detection port 412. A gas volume flow meter detects the gas volume flow rate passing through the testing area.

[0036] The detection port 412 is sealed and connected to the docking groove 13, which can reduce the amount of external gas that bypasses the detection area and enters the test chamber 411, so that the measured gas volume flow rate can characterize the flow state of the detection area.

[0037] The control unit is connected to the rotary table 20, the plasma spraying device, the linear drive mechanism 42, the air extraction device, and the gas volume flow meter, and stores the calibration relationship between the calibrated spraying amount and the reduction in transparency value.

[0038] The control unit determines the third transparency value of the metal mesh workpiece 70 after spraying the first side based on the gas volume flow rate measured by the gas volume flow meter, calculates the difference between the third transparency value and the preset target transparency value to obtain the allowable reduction in transparency value, and then determines the second side spraying amount corresponding to the allowable reduction in transparency value based on the stored calibration relationship. The control unit then controls the plasma spraying device to spray the second side of the metal mesh workpiece 70 according to the second side spraying amount so that the reduction in transparency value generated by the second side spraying matches the allowable reduction in transparency value.

[0039] Further, see Figure 1 and Figure 5 As shown, the jig plate 16 is rectangular, and a rotary cylinder 14 is installed at each of the four corners of the jig plate 16. The output end of each rotary cylinder 14 is connected to a pressure head 15.

[0040] Before the metal mesh workpiece 70 is inserted into the positioning groove 12, each rotary cylinder 14 drives the corresponding pressing head 15 to rotate to the clearance position outside the positioning groove 12, keeping the positioning groove 12 open. After the metal mesh workpiece 70 is placed into the positioning groove 12, each rotary cylinder 14 drives the corresponding pressing head 15 to rotate and move towards the positioning groove 12, so that the four pressing heads 15 are respectively pressed on the edge of the metal mesh workpiece 70, pressing the metal mesh workpiece 70 tightly against the bottom of the positioning groove 12.

[0041] Four pressure heads 15 are respectively positioned near the four corners of the metal mesh workpiece 70, and are all located outside the detection area. The positioning groove 12 restricts the movement of the metal mesh workpiece 70 along the surface of the fixture plate 16, and the four pressure heads 15 restrict the movement of the metal mesh workpiece 70 perpendicular to the surface of the fixture plate 16, thereby preventing the metal mesh workpiece 70 from tilting and changing position during rotation, spraying, and detection, and keeping the detection area corresponding to the through window 11.

[0042] Further, see Figures 2 to 3 As shown, the linear drive mechanism 42 includes a cylinder 421, a pressure plate 422, a guide rod 423, and a spring 424. One end of the guide rod 423 is connected to the test housing 41, and the other end is provided with a limiting part 426. A step part 425 is provided in the middle of the guide rod 423. The pressure plate 422 is slidably sleeved on the guide rod 423 and is located between the step part 425 and the limiting part 426. The telescopic rod of the cylinder 421 is connected to the pressure plate 422, and the spring 424 is sleeved on the guide rod 423, with both ends of the spring 424 abutting against the pressure plate 422 and the step part 425, respectively.

[0043] In this embodiment, the end of the guide rod 423 away from the test housing 41 is provided with a threaded section, and the limiting part 426 is a limiting nut connected to the threaded section. There may be two or more guide rods 423, which are arranged at intervals along the circumference of the test housing 41 to limit the deflection of the test housing 41 during its movement.

[0044] When the telescopic rod of cylinder 421 extends, it drives pressure plate 422 to move along guide rod 423 toward clamping fixture 10. When the outer edge of detection port 412 contacts the bottom of docking groove 13, pressure plate 422 compresses spring 424, and spring 424 applies elastic clamping force to test housing 41 through step portion 425.

[0045] Spring 424 elastically presses the test housing 41 against the mating groove 13, which can accommodate the assembly size deviation and mating position deviation between the test port 412 and the mating groove 13, reduce contact impact, and maintain the seal between the test port 412 and the mating groove 13.

[0046] After the test is completed, the telescopic rod of cylinder 421 retracts, the pressure plate 422 moves along the guide rod 423, and after abutting against the limiting part 426, it drives the test housing 41 away from the clamping fixture 10 through the guide rod 423, so that the test port 412 is separated from the docking groove 13, leaving space for the subsequent rotation of the clamping fixture 10.

[0047] Furthermore, the detection unit 40 also includes a negative pressure sensor. The negative pressure sensor is installed in the test housing 41, its detection end is connected to the test chamber 411, and the negative pressure sensor is connected to the control unit to detect the negative pressure value inside the test chamber 411. The control unit is also connected to the vacuum device.

[0048] During permeability detection, the negative pressure sensor sends the detected negative pressure value to the control unit. When the absolute value of the negative pressure in the test chamber 411 is lower than the lower limit of the preset range, the control unit increases the pumping volume of the suction device; when the absolute value of the negative pressure is higher than the upper limit of the preset range, the control unit decreases the pumping volume of the suction device to keep the negative pressure in the test chamber 411 within the preset range.

[0049] The first, second, and third transparency values ​​were detected using the same preset negative pressure range to reduce the impact of pressure difference changes on gas volume flow rate and to make the transparency values ​​measured at different spraying stages comparable.

[0050] In this embodiment, the positioning, spraying, and transparency detection of the metal mesh workpiece 70 are integrated into a single rotary table. The spraying and detection positions are switched via a rotating clamping fixture. Spraying on the first side, transparency detection, and spraying on the second side are completed in a single clamping operation, maintaining consistency in positioning during spraying and detection, and improving processing efficiency. During detection, the test housing 41 and the mating groove 13 of the clamping fixture 10 are sealed together, allowing negative pressure to act on the detection area of ​​the metal mesh workpiece 70 through the through-window 11. A gas volume flow meter detects the gas volume flow rate passing through the detection area, ensuring the stability and accuracy of transparency detection and providing a reliable data basis for determining the amount of spraying on the second side. Therefore, the final transparency value of the metal mesh workpiece 70 after double-sided spraying reaches or approaches the preset target transparency value, allowing the reaction medium to reach the functional coating surface through the mesh openings as expected and participate in the electrochemical reaction, thereby helping to improve the electrochemical reaction efficiency of the metal mesh electrode.

[0051] Example 2: See Figure 8 As shown, Embodiment 2 of the present invention discloses a method for spraying a metal mesh coating, comprising the following steps: Before double-sided spraying of the metal mesh workpiece 70, a calibration relationship is established in advance. The calibration relationship characterizes the relationship between multiple calibrated spraying amounts and the corresponding reduction in transparency value. The reduction in transparency value is the difference between the first transparency value of the first side of the same metal mesh calibration workpiece after spraying with the reference spraying amount and the second transparency value of its second side after spraying with the corresponding calibrated spraying amount.

[0052] The reference coating amount is a predetermined coating amount used for the first side coating, which can be controlled by at least one of the following coating parameters: powder feed rate, spray gun moving speed, and number of spray passes. The reference coating amount can be predetermined according to the specifications of the metal mesh, the coating material, and the process requirements of the metal mesh electrode.

[0053] The reference coating amount is the same as the coating amount used on the first side of the metal mesh calibration component when establishing the calibration relationship, and the transparency value after coating the first side is higher than the preset target transparency value, so as to reduce the margin for retaining the transparency value for coating the second side.

[0054] In this embodiment, the reference spraying amount, the calibrated spraying amount, and the second side spraying amount are all expressed as a set powder supply mass corresponding to a unit spraying area. The set powder supply mass can be determined based on the powder feeding rate, effective powder feeding time, and spraying area, and its unit of measurement is, for example, g / m². The reference spraying amount, the calibrated spraying amount, and the second side spraying amount use the same definition and unit of measurement.

[0055] It should be noted that the reference coating amount used on the first side is not directly set according to the minimum coating amount required for the effective operation of the functional coating. Instead, it is set with a process margin for fluctuations in the coating process, while ensuring that the functional coating on one side meets the predetermined deposition amount, coverage, and electrochemical activity requirements. Therefore, even if the actual deposition amount on the first side fluctuates within the allowable range, the resulting functional coating can still meet the usage requirements. The calibration coating amounts used in the calibration relationship are also limited to the range that ensures the functional coating on the second side meets the usage requirements. The coating amount on the second side determined within the coverage range of the calibration relationship is also within this range. Thus, although there may be differences between the coating amounts on the first and second sides, the functional coatings on both sides can meet their respective minimum formation requirements. The adjustment of the coating amount on the second side in this invention is used to make the final transparency value after double-sided coating reach or approach the preset target transparency value, rather than improving the transparency of the metal mesh at the expense of the performance of the functional coating on one side.

[0056] Plasma spraying is performed on the first side of the metal mesh workpiece 70 according to the reference spraying amount.

[0057] After the first side is coated, the third transparency value of the metal mesh workpiece 70 after the first side is coated is measured. The third transparency value is used to characterize the actual transparency state retained by the metal mesh workpiece 70 after the first side is coated.

[0058] The difference between the third transparency value and the preset target transparency value is calculated to obtain the allowable reduction in transparency value: ΔK a =K3 K t ; Where, ΔK a To allow for a reduction in permeability, K3 is the third permeability value, K t The preset target transparency value.

[0059] Based on the calibration relationship, the amount of second-side coating corresponding to the allowable reduction in transparency value is determined, and plasma spraying is performed on the second side of the metal mesh workpiece 70 according to the amount of second-side coating, thereby completing the double-sided coating of the metal mesh workpiece 70.

[0060] Due to the influence of the initial state of the metal mesh, the deposition efficiency of the spraying material, and fluctuations in the spraying process, the third transparency value of different metal mesh workpieces 70 after completing the first side spraying may vary slightly. When the third transparency value is relatively low, the determined amount of second side spraying is reduced accordingly; when the third transparency value is relatively high, the determined amount of second side spraying is increased accordingly. This ensures that the reduction in transparency value caused by the second side spraying matches the allowable reduction in transparency value, so that the final transparency value of the metal mesh workpiece 70 after completing double-sided spraying reaches or approaches the preset target transparency value.

[0061] The control principle of the above method is as follows: the first side of the metal mesh calibration part in the calibration stage and the first side of the metal mesh workpiece 70 in the actual spraying stage are both sprayed with the same reference spraying amount, so that the calibration relationship and the actual spraying have the same first side spraying reference. The calibration relationship represents the amount of reduction in transparency value generated when different calibration spraying amounts are used on the second side under the first side spraying reference.

[0062] Although the same baseline coating amount is used on the first side, the actual transparency values ​​of different metal mesh workpieces 70 after coating on the first side may still differ due to the initial state of the metal mesh, the deposition efficiency of the coating material, and fluctuations in the coating process. Therefore, a third transparency value is detected during the actual coating process, and the allowable reduction in transparency value is determined based on the difference between the third transparency value and the preset target transparency value. The coating amount on the second side corresponding to this allowable reduction in transparency value is determined according to the calibration relationship, so that the coating amount on the second side is adjusted according to the actual transparency state after coating on the first side to compensate for the deviation between the actual transparency state after coating on the first side and the expected state.

[0063] When the allowable reduction in transparency value determined after the first side coating is small, the determined amount of coating on the second side is correspondingly reduced to minimize further occupation of the effective flow space of the mesh by the second side coating. When the allowable reduction in transparency value determined after the first side coating is large, the determined amount of coating on the second side is correspondingly increased, so that the actual reduction in transparency value generated by the second side coating matches the allowable reduction in transparency value. Therefore, under the premise that the functional coatings on both sides meet the usage requirements, the final transparency value of the metal mesh workpiece 70 after double-sided coating reaches or approaches the preset target transparency value, allowing the reaction medium to reach the functional coating surface through the mesh as expected and participate in the electrochemical reaction, thereby helping to improve the electrochemical reaction efficiency of the metal mesh electrode.

[0064] Further, see Figure 11 and Figure 12 As shown, in the actual spraying process of metal mesh, in addition to being deposited on the surface of the metal wires, the spraying material also forms local accumulations at the intersections of the metal wires and the edges of the mesh. Figure 11These are microscopic images of comparative samples using fixed spraying parameters in existing technologies. There is significant coating buildup at some wire intersections and mesh edges, and the effective openings of some meshes are largely occupied. Figure 12 These are microscopic images of samples from an embodiment of the spraying method of the present invention. While a coating is formed on the surface of the metal wire, most of the mesh holes still maintain relatively complete and effective openings, and the degree of excessive accumulation at the edges of the mesh holes is relatively low.

[0065] The aforementioned microstructure illustrates that the deposition state of the coating material on the metal wire surface and mesh edges affects the effective flow space retained by the mesh. When the actual transparency value of the metal mesh workpiece is already relatively low after the first side is coated, if the second side continues to be coated with a fixed amount, it may further occupy the effective flow space of the mesh. This embodiment detects the third transparency value after the first side is coated, determines the allowable reduction in transparency value based on the difference between the third transparency value and the preset target transparency value, and determines the amount of coating on the second side accordingly. This ensures that the amount of coating on the second side matches the actual transparency state after the first side is coated, thereby reducing the risk of excessive occupation of the effective flow space of the mesh caused by the second side coating.

[0066] Therefore, based on meeting the requirements for forming functional coatings on both sides of the metal mesh, this embodiment can adjust the amount of coating on the second side according to the actual transparency state after the first side is coated, thereby reducing the excessive occupation of the effective flow space of the mesh by the second side coating, which is conducive to making the final transparency value after double-sided coating reach or approach the preset target transparency value.

[0067] Further, see Figure 9 As shown, the calibration relationship is established using multiple (e.g., 6 to 8) metal mesh calibration pieces. Each metal mesh calibration piece has the same material, wire diameter, mesh count, external dimensions, and detection area as the metal mesh workpiece, and uses the same spraying material and first-side reference spraying amount; except for the different calibration spraying amount used on the second side of each metal mesh calibration piece, the other spraying conditions between each metal mesh calibration piece are the same.

[0068] The establishment of the calibration relationship includes the following steps: S101: Perform plasma spraying on the first side of each metal mesh calibration component according to the reference spraying amount.

[0069] S102: Detect the first transparency value of each metal mesh marker after the first side is sprayed.

[0070] S103: The second side of each metal mesh calibration component is plasma-coated with different calibration coating amounts.

[0071] S104: Detect the second transparency value of each metal mesh marker after the second side is sprayed.

[0072] S105: Calculate the reduction in transparency value corresponding to each calibrated coating amount.

[0073] For each metal mesh calibration piece, calculate the difference between its first transparency value and second transparency value to obtain the reduction in transparency value at the corresponding calibration coating amount for that sample: ΔK=K1 K2; Where ΔK is the decrease in permeability, K1 is the first permeability value, and K2 is the second permeability value.

[0074] S106: Establish the calibration relationship for piecewise linearity.

[0075] Multiple calibration points are constructed using each calibrated coating amount as the x-axis and the corresponding reduction in transparency as the y-axis. The calibration points are arranged in ascending order of the calibrated coating amount, and linear interpolation is performed on adjacent calibration points to establish a piecewise linear calibration relationship.

[0076] Specifically, each calibration point is represented as (M i ΔK i ), where Mi is the calibrated coating amount, ΔK i This corresponds to the reduction in transparency value. The two adjacent calibration points are (M... i ΔK i ) and (M i+1 ΔK i+1 ).

[0077] When the allowable permeability value decreases by ΔK a satisfy: ΔK i ≤ΔK a ≤ΔK i+1 ; Linear interpolation is performed based on the two adjacent calibration points, and the second side spraying amount M2 is determined according to the following formula: M2=M i + (M) i+1 M i )×(ΔK) a ΔK i ) / (ΔK i+1 ΔK i ).

[0078] When the allowable permeability value decreases by ΔK a When the amount of light penetration decreases by the amount of light penetration at one of the calibration points, the amount of paint applied at that calibration point is directly determined as the amount of paint applied on the second side, M2.

[0079] In this embodiment, within the range of the calibrated spray volume, the reduction in transparency increases with the increase of the calibrated spray volume. The reduction in transparency is allowed to fall within the range of transparency reductions covered by the calibration relationship.

[0080] During actual calibration, multiple different calibration coating amounts can be selected within the allowable range of second-side coating amounts for the metal mesh workpiece 70. Each calibration coating amount can be set at equal intervals, or the interval between adjacent calibration coating amounts can be reduced in the coating amount range where the transparency value decreases rapidly.

[0081] Each calibration coating amount uses an independent metal mesh calibration element to avoid cumulative deposition caused by continuous spraying, which could affect the comparability between calibration points. Piecewise linear interpolation is used, which allows the coating amount on the second side to be determined based on adjacent calibration points without the need to establish a complex mathematical model.

[0082] Further, see Figure 10 As shown, the first transparency value, the second transparency value, and the third transparency value are obtained through the following methods: When performing transparency testing, clamp the metal mesh workpiece 70 or the outer periphery of the metal mesh calibration piece to expose the testing area of ​​the metal mesh.

[0083] The first side of the metal mesh workpiece 70 or the metal mesh calibration piece is made open to the outside atmosphere, and a negative pressure chamber communicating with the detection area is formed on the second side of the metal mesh workpiece 70 or the metal mesh calibration piece. The periphery of the negative pressure chamber is sealed so that gas enters the negative pressure chamber only through the detection area.

[0084] The negative pressure chamber is evacuated, and the gas volume flow rate passing through the detection area and entering the negative pressure chamber from the first side of the metal mesh workpiece 70 or the metal mesh calibration piece is detected. The corresponding permeability value is determined based on the gas volume flow rate.

[0085] By sealing the periphery of the negative pressure chamber, the bypass flow of gas around the detection area can be reduced, so that the change in gas volume flow rate mainly reflects the change in the effective flow space of the mesh openings of the metal mesh workpiece 70 or the metal mesh calibration piece.

[0086] Furthermore, the negative pressure value inside the negative pressure chamber is detected, and the air extraction volume is adjusted according to the negative pressure value so that the negative pressure value inside the negative pressure chamber is kept within the same preset range during each permeability value detection.

[0087] When the absolute value of the negative pressure in the negative pressure chamber is lower than the preset range, the pumping volume is increased; when the absolute value of the negative pressure in the negative pressure chamber is higher than the preset range, the pumping volume is decreased. This reduces the impact of different detection pressure differences on the gas volumetric flow rate, making the first, second, and third permeability values ​​comparable.

[0088] Furthermore, the first transparency value, the second transparency value, the third transparency value, and the preset target transparency value are all determined according to the ratio of the gas volume flow rate passing through the metal mesh workpiece 70 or the metal mesh calibration part detection area under preset detection conditions to the area of ​​the detection area, and satisfy: K=Q / A; Wherein, K is the permeability value, Q is the gas volume flow rate passing through the detection area when a preset detection pressure difference is maintained on both sides of the metal mesh, and A is the effective detection area of ​​the detection area, that is, the overall area of ​​the detection area in the plane of the metal mesh.

[0089] The transparency value represents the gas volumetric flow rate per unit detection area under preset detection conditions, and is used to characterize the flow capacity of the metal mesh. When the gas volumetric flow rate Q is expressed in m³ / s and the detection area A is expressed in m², the unit of the transparency value is m / s.

[0090] The first, second, and third transparency values ​​were all measured under the same gas type, detection pressure difference, detection area, and detection temperature. The preset target transparency value was also predetermined under the same detection conditions. With the same metal mesh specifications and detection conditions, a higher transparency value indicates a larger gas volume flow rate per unit detection area under the same detection pressure difference, and a stronger flow capacity of the metal mesh openings; a lower transparency value indicates a weaker flow capacity of the metal mesh openings.

[0091] Furthermore, before detecting the first transparency value, the second transparency value, or the third transparency value, the metal mesh calibration part or metal mesh workpiece 70 that has completed the corresponding plasma spraying is allowed to undergo a preset cooling time, and clean gas is blown onto it.

[0092] Cooling is used to reduce the temperature of the metal mesh calibration component or metal mesh workpiece 70 to a preset detection temperature range. Cooling can be achieved through natural cooling or assisted cooling with clean gas. The cooling time can be preset according to the metal mesh specifications, spraying parameters, and ambient temperature, with the metal mesh temperature reaching the preset detection temperature range as the condition for cooling completion. In this embodiment, the preset detection temperature range is 20℃~40℃.

[0093] Cleaning is used to remove loosely adhered sprayed particles from the surface of the inspection area and the edges of the mesh. Cleaning can be performed by purging with clean gas, with purging conditions set to remove loose sprayed particles without damaging the existing coating.

[0094] The calibration process and the actual spraying process use the same cooling and cleaning conditions to reduce the test differences caused by differences in the degree of cooling and cleaning.

[0095] Cooling is used to reduce the impact of temperature changes on the state of the detected gas, the size of the metal mesh, and the sealing condition; cleaning is used to reduce detection deviations caused by loose spray particles temporarily obscuring the mesh openings.

[0096] Example 3 See Figures 1 to 10 As shown, Embodiment 3 of the present invention discloses the specific process of implementing the spraying method of Embodiment 2 using the system described in Embodiment 1 as follows: The metal mesh workpiece 70 is placed into the positioning groove 12 of the fixture plate 16, so that the detection area of ​​the metal mesh workpiece 70 corresponds to the through window 11. The four rotary cylinders 14 drive the corresponding pressure heads 15 to rotate and move toward the positioning groove 12, pressing the metal mesh workpiece 70 firmly against the bottom of the positioning groove 12.

[0097] The rotary table 20 drives the clamping fixture 10 to rotate, so that the first side of the metal mesh workpiece 70 faces the plasma spraying device. The control unit controls the plasma spraying device to perform plasma spraying on the first side of the metal mesh workpiece 70 according to the reference spraying amount.

[0098] After the first side is coated, the metal mesh workpiece 70 is allowed to cool for a preset time, and cleaning gas is blown onto the metal mesh workpiece 70 to remove loose coating material adhering to the surface and mesh edges of the metal mesh workpiece 70.

[0099] Subsequently, the rotary table 20 drives the clamping fixture 10 to rotate to the testing position, so that the mating groove 13 of the fixture plate 16 faces the test housing 41.

[0100] The control unit controls the linear drive mechanism 42 to move the test housing 41 toward the clamping fixture 10, so that the outer edge of the detection port 412 is elastically pressed against the bottom of the docking groove 13. At this time, the test cavity 411 is connected to the detection area of ​​the metal mesh workpiece 70 through the detection port 412, the docking groove 13 and the through window 11.

[0101] The control unit controls the suction device to evacuate the test chamber 411. The negative pressure sensor detects the negative pressure value inside the test chamber 411, and the control unit adjusts the suction volume of the suction device according to the detection result of the negative pressure sensor to keep the negative pressure value inside the test chamber 411 within a preset range.

[0102] Under the negative pressure inside the test chamber 411, external gas passes through the detection area from the side of the metal mesh workpiece 70 away from the test chamber 411, and enters the test chamber 411 through the through window 11 and the detection port 412.

[0103] The gas volume flow meter detects the gas volume flow rate passing through the detection area and sends the detection result to the control unit.

[0104] The control unit determines the third permeability value based on the gas volume flow rate, calculates the difference between the third permeability value and the preset target permeability value to obtain the allowable reduction in permeability value, and determines the second side spraying amount corresponding to the allowable reduction in permeability value based on the pre-stored calibration relationship.

[0105] After the test is completed, the air extraction device stops extracting air, and the linear drive mechanism 42 drives the test housing 41 away from the clamping fixture 10, so that the test port 412 is separated from the docking groove 13.

[0106] The rotary table 20 continues to drive the clamping fixture 10 to rotate, so that the second side of the metal mesh workpiece 70 faces the plasma spraying device. The control unit controls the plasma spraying device to perform plasma spraying on the second side of the metal mesh workpiece 70 through the docking groove 13 and the through window 11 according to the determined spraying amount on the second side, thereby completing the double-sided spraying.

[0107] See Figures 1 to 10 As shown, the aforementioned calibration relationship can be pre-established using the metal mesh coating spraying system described in Example 1. Specifically, before formally spraying the metal mesh workpiece 70 on both sides, multiple metal mesh calibration pieces with the same material, wire diameter, mesh count, external dimensions, and detection area as the metal mesh workpiece 70 to be sprayed are selected for calibration.

[0108] In this embodiment, 6 to 8 metal mesh calibration pieces can be selected for calibration to cover the preset adjustment range of the second side coating amount. Each metal mesh calibration piece is sequentially clamped in the clamping fixture 10 and maintained in the same clamping state as in the actual coating process.

[0109] First, the control unit controls the rotary table 20 to rotate, so that the first side of each metal mesh marking component faces the plasma spraying device. The plasma spraying device then performs plasma spraying on the first side of each metal mesh marking component according to a preset reference spraying amount.

[0110] After the first side is coated, each metal mesh marker undergoes the same cooling and cleaning process as the formal coating process to reduce the impact of temperature changes after coating and loose coating particles on the transparency test results.

[0111] Subsequently, the control unit controls the rotary table 20 to rotate, causing the clamping fixture 10 to move to the detection position. The test housing 41 in the detection unit 40 moves toward the clamping fixture 10 under the drive of the linear drive mechanism 42, so that the detection port 412 is sealed and engaged with the mating groove 13 of the clamping fixture 10.

[0112] The suction device evacuates the test chamber 411, creating a negative pressure inside. A negative pressure sensor detects the negative pressure value inside the test chamber 411, and the control unit adjusts the suction volume of the suction device based on the detection result to keep the negative pressure value of each metal mesh calibration component within a preset range during testing.

[0113] The gas volume flow meter detects the gas volume flow rate passing through the detection area of ​​the metal mesh calibration component. The control unit calculates the first transparency value after the first side of each metal mesh calibration component is sprayed based on the gas volume flow rate and the area of ​​the detection area.

[0114] After the first transparency value test is completed, the control unit controls the rotary table 20 to rotate so that the second side of each metal mesh calibration component faces the plasma spraying device.

[0115] Subsequently, plasma spraying was performed on the second side of each metal mesh calibration component using different calibration spraying amounts. The first side of each metal mesh calibration component used the same baseline spraying amount; only the second side used a different calibration spraying amount.

[0116] After the second side is coated, each metal mesh marker undergoes the same cooling and cleaning process as after the first side is coated, and the second transparency value after the second side is coated is detected by the detection unit 40.

[0117] The control unit calculates the reduction in transparency value based on the first and second transparency values ​​corresponding to the same metal mesh calibration element: ΔK=K1 K2; Where ΔK is the decrease in permeability, K1 is the first permeability value, and K2 is the second permeability value.

[0118] Therefore, the reduction in transparency value corresponding to different calibrated coating amounts can be obtained.

[0119] The control unit uses each calibrated coating amount as the abscissa and the corresponding reduction in transparency value as the ordinate to form multiple calibration points. It then connects adjacent calibration points in ascending order of calibrated coating amount to establish a calibration relationship between the calibrated coating amount and the reduction in transparency value.

[0120] Furthermore, to improve the accuracy of determining the second-side coating amount, the control unit can perform linear interpolation on the data between adjacent calibration points. When the allowable reduction in transparency value obtained during the actual coating process is between the reductions in transparency value corresponding to two adjacent calibration points, the corresponding second-side coating amount is determined based on the linear relationship between the two calibration points.

[0121] After calibration is completed, the control unit stores the established calibration relationship. In the subsequent formal spraying process, after the first side of the metal mesh workpiece 70 to be sprayed is sprayed with the same reference spraying amount and the third transparency value is detected, the control unit determines the allowable reduction in transparency value based on the difference between the third transparency value and the preset target transparency value, and determines the corresponding spraying amount for the second side based on the calibration relationship.

[0122] Since the calibration process uses the same clamping method, spraying device, spraying parameter control method, and transparency detection method as the formal spraying process, the established calibration relationship can reflect the influence of the second-side spraying amount on the change of the metal mesh transparency state, thus providing a basis for determining the second-side spraying amount during the formal spraying process. By determining the second-side spraying amount based on the actual transparency value after the first-side spraying, it is possible to ensure that the final transparency value after double-sided spraying reaches or approaches the preset target transparency value, provided that the functional coatings on both sides meet the usage requirements. This allows the reaction medium to reach the functional coating surface through the mesh as expected and participate in the electrochemical reaction, thereby helping to improve the electrochemical reaction efficiency of the metal mesh electrode.

[0123] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for spraying a metal mesh coating, characterized in that: include: Establish a calibration relationship, which characterizes the relationship between multiple calibrated coating amounts and the corresponding reduction in transparency value; The reduction in transparency value is the difference between the first transparency value of the first side of the same metal mesh calibration component after being sprayed with the reference spraying amount and the second transparency value of its second side after being sprayed with the corresponding calibration spraying amount. Plasma spraying is performed on the first side of the metal mesh workpiece according to the reference spraying amount; the third transparency value of the metal mesh workpiece after spraying on the first side is detected. The difference between the third transparency value and the preset target transparency value is calculated to obtain the allowable reduction in transparency value; Based on the calibration relationship, determine the amount of second-side coating corresponding to the allowable reduction in transparency value; Plasma spraying is performed on the second side of the metal mesh workpiece according to the second side spraying amount.

2. The metal mesh coating spraying method according to claim 1, characterized in that: The method for establishing the calibration relationship includes: Plasma spraying was performed on the first side of each metal mesh calibration component according to the reference spraying amount, and the first transparency value of each metal mesh calibration component was detected. Plasma spraying was performed on the second side of each metal mesh calibration component according to different calibration spraying amounts, and the second transparency value of each metal mesh calibration component was tested. Based on the first and second transparency values ​​of each metal mesh calibration component, the reduction in transparency value corresponding to different calibration coating amounts is obtained; Multiple calibration points are constructed using the specified coating amount as the abscissa and the corresponding reduction in transparency value as the ordinate. Linear interpolation is performed on adjacent calibration points in ascending order of the specified coating amount to establish a piecewise linear calibration relationship.

3. The metal mesh coating spraying method according to claim 1, characterized in that: The first transparency value, the second transparency value, and the third transparency value are obtained through the following method: Clamp the metal mesh workpiece or metal mesh calibration piece so that the detection area of ​​the metal mesh workpiece or metal mesh calibration piece is exposed; The first side of the metal mesh workpiece or metal mesh calibration piece is made to communicate with the atmosphere, and a negative pressure cavity communicating with the detection area is formed on the second side of the metal mesh workpiece or metal mesh calibration piece. The periphery of the negative pressure chamber is sealed so that gas enters the negative pressure chamber only through the detection area; The negative pressure chamber is evacuated, and the gas volume flow rate passing through the detection area and entering the negative pressure chamber from the first side of the metal mesh workpiece or metal mesh calibration piece is detected. The corresponding permeability value is determined based on the gas volume flow rate.

4. The metal mesh coating spraying method according to claim 3, characterized in that: The negative pressure value inside the negative pressure chamber is detected, and the air extraction volume is adjusted according to the negative pressure value so that the negative pressure value inside the negative pressure chamber is kept within the same preset range during each permeability value detection.

5. The metal mesh coating spraying method according to claim 3, characterized in that: Each of the aforementioned transparency values ​​is determined according to the ratio of the gas volume flow rate through the detection area of ​​the metal mesh workpiece or metal mesh calibration piece to the area of ​​the detection area, and satisfies: K=Q / A; Wherein, K is the permeability value, Q is the gas volume flow rate through the detection area, and A is the area of ​​the detection area.

6. The metal mesh coating spraying method according to claim 3, characterized in that: Before detecting the first, second, or third transparency value, the metal mesh workpiece or metal mesh calibration piece that has undergone the corresponding plasma spraying is allowed to undergo a preset cooling time, and cleaning gas is blown onto the metal mesh workpiece or metal mesh calibration piece to remove loose sprayed material adhering to the metal mesh workpiece or metal mesh calibration piece.

7. A metal mesh coating spraying system, characterized in that: include: A clamping fixture includes a fixture plate, the fixture plate having a through window and positioning grooves and docking grooves on its opposite sides, the positioning grooves and the docking grooves being connected to the through window; the positioning grooves are used to position the metal mesh workpiece, and the through window corresponds to the detection area of ​​the metal mesh workpiece; A rotary table is used to drive the clamping fixture to rotate so that the positioning groove is opposite to the plasma spraying device, or the docking groove is opposite to the detection unit. The plasma spraying device; The detection unit includes a test housing, a linear drive mechanism, and an air extraction device; the test housing is provided with a test chamber, a detection port, and an air extraction port, both of which are connected to the test chamber; the linear drive mechanism is used to drive the detection port to seal or separate from the docking groove; the air extraction port is connected to the air extraction device via a gas volume flow meter. The control unit, connected to the plasma spraying device and the gas volume flow meter, stores a calibration relationship between the calibrated spraying amount and the reduction in transparency value. The control unit determines the third transparency value of the first side of the metal mesh workpiece after spraying based on the gas volume flow rate, determines the second side spraying amount from the calibration relationship based on the difference between the third transparency value and the preset target transparency value, and controls the plasma spraying device to spray the second side of the metal mesh workpiece according to the second side spraying amount.

8. The metal mesh coating spraying system according to claim 7, characterized in that: The edge of the clamping fixture is provided with a rotary cylinder, and the output end of the rotary cylinder is connected to a pressure head; the rotary cylinder is used to drive the pressure head to rotate and move toward the positioning groove, so as to press the metal mesh workpiece into the positioning groove.

9. The metal mesh coating spraying system according to claim 7, characterized in that: The linear drive mechanism includes a cylinder, a pressure plate, a guide rod, and a spring; one end of the guide rod is connected to the test housing, and the other end is provided with a limiting part, and the middle part of the guide rod is provided with a stepped part; the pressure plate is slidably sleeved on the guide rod and located between the stepped part and the limiting part; the telescopic rod of the cylinder is connected to the pressure plate, and the spring is sleeved on the guide rod, with both ends abutting against the pressure plate and the stepped part respectively.

10. The metal mesh coating spraying system according to claim 7, characterized in that: The detection unit also includes a negative pressure sensor, which is connected to the test chamber and the control unit. The control unit is also connected to the suction device and adjusts the suction volume of the suction device according to the detection result of the negative pressure sensor so that the negative pressure value in the test chamber is maintained within a preset range.

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