Printed circuit board antioxidant detection device and method

Abstract

The present invention relates to the field of circuit board testing technology and discloses a printed circuit board (PCB) antioxidant testing device and method, comprising a salt spray tester and a salt spray collection unit. The salt spray tester comprises an outer chassis, a gas compression device, a liquid filling pipe, and a bracket. The bracket is fixed to the top of the outer chassis and has a plurality of holes formed therein. The gas compression device and the liquid filling pipe are both arranged on the outer chassis and are used to atomize the salt spray solution. A linear drive module is mounted on the side of the outer chassis. The present invention achieves complete collection of the salt spray solution within the top cover. This salt spray recovery function not only ensures that the salt spray does not escape when the top cover is opened, effectively preventing potential harm to the staff and the surrounding working environment caused by the salt spray, but also significantly reduces resource waste.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board detection, and in particular to a printed circuit board antioxidant detection device and method. Background Art

[0002] Salt spray testing of circuit boards is an important environmental reliability test used to evaluate the corrosion resistance of circuit boards in salt spray environments. The main purpose of salt spray testing is to simulate the corrosion conditions in marine or high-salinity environments to evaluate the durability and reliability of circuit boards and their components in such environments. Through testing, we can understand the corrosion conditions of circuit boards in salt spray environments and provide a basis for product design, material selection and improvement.

[0003] After searching, the Chinese patent with the announcement number CN220729985U discloses a rust-proof circuit board and its rust-proof test device, which includes a circuit board body, and a plurality of through holes distributed in a matrix are opened on the circuit board body, and moisture can seep out from the through holes; in this rust-proof circuit board and its rust-proof test device, through the mutual cooperation of the clamping rotation structure and the spray structure, the clamping rotation structure pushes the clamping plate to slide on the mounting plate through the clamping cylinder, so as to clamp the circuit board placed between the clamping plates, and the driving motor rotates the driving shaft so that the shaft can drive the mounting plate to rotate the clamped circuit board, and the water inlet of the water pump is connected to the external salt-containing liquid so that the nozzle can spray salt mist on the surface of the clamped and rotating circuit board. In the salt mist environment, the rust resistance of the circuit board can be effectively tested, which greatly improves the test efficiency of the rust resistance of the circuit board and makes the test more comprehensive. However, the above scheme still has the following shortcomings when used in practice:

[0004] The salt spray tester of the above scheme does not have a salt spray collection function. This defect is particularly prominent after the test work is completed. When the staff directly opens the sealing cover and takes out the circuit board from the machine, the salt spray tester inside the salt spray tester will escape. The escape of salt spray will not only pollute the test environment, but also pose a threat to the health of the operator. Salt spray contains corrosive substances. Long-term exposure to such an environment may have adverse effects on the operator's respiratory system, skin, etc. In addition, during the salt spray test process, in order to simulate a specific corrosive environment, a large amount of salt and water are required to generate salt spray. However, when the test is over, if the salt spray tester is not equipped with an effective salt spray collection system, then the salt spray will escape into the air, resulting in a waste of resources.

[0005] Therefore, it is necessary to design a printed circuit board antioxidant detection device and method to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a printed circuit board antioxidant detection device and method.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A printed circuit board antioxidant testing device, comprising a salt spray testing machine and a salt spray collection unit;

[0009] The salt spray tester includes an outer chassis, a gas compression device, a liquid filling pipe and a bracket. The bracket is fixed to the top of the outer chassis, and a plurality of holes are opened on the bracket. The gas compression device and the liquid filling pipe are both arranged on the outer chassis for atomizing the salt spray solution. A linear drive module is installed on the side of the outer chassis, and a linear slide is assembled on the linear drive module. The outer chassis is also provided with a rotatable top cover structure, and the top cover structure includes a top cover and a spray pipe. The top cover is rotatably mounted on the outer chassis, and the spray pipe is fixed inside the top cover. The spray pipe is connected to the gas compression device, and a plurality of spray heads are provided on the spray pipe.

[0010] Among them, the salt mist collection unit includes a recovery structure, a sealing structure, a driving structure and a liquid collection structure. The recovery structure is used to absorb the salt mist inside the top cover, the sealing structure is used to seal the top cover, the driving structure is used to drive the recovery structure to operate, and the liquid collection structure is used to collect the salt mist solution.

[0011] As a preferred technical solution of the present invention, the recovery structure includes an opening, an induced draft tube, a salt mist collecting tube, a rotating shaft and an air-inducing member, the opening is opened on the side of the top cover, the induced draft tube is fixed in the opening, the salt mist collecting tube is fixed on the side of the top cover, and the salt mist collecting tube is arranged opposite the opening, the rotating shaft is rotatably installed inside the salt mist collecting tube, and the rotating shaft and the salt mist collecting tube are coaxially arranged, one end of the rotating shaft extends through the opening to the inside of the top cover, the air-inducing member is fixed to the end of the rotating shaft located inside the top cover, the air-inducing member is composed of an end cap and a plurality of axial flow blades, the end cap is fixed to the end of the rotating shaft located inside the top cover, the plurality of axial flow blades are all fixed on the end cap, and the plurality of axial flow blades are distributed in a circumferential array.

[0012] As a preferred technical solution of the present invention, the sealing structure includes a sealing disc and a plurality of sealing members. A hole is provided in the middle of the sealing disc. The sealing disc is fixedly sleeved on the rotating shaft and is located inside the opening. Each of the sealing members is provided on the sealing disc, and the plurality of sealing members are distributed in a circumferential array.

[0013] The sealing component includes a vent, a sliding baffle, a first fixed plate, a second fixed plate and a counterweight. The vent is opened on the side of the sealing disk, the sliding baffle is slidably set on the sealing disk, and the sliding baffle is set opposite the vent. A limiting block is fixed on the side of the sliding baffle, and the limiting block slides in the vent. A limiting plate is fixed on the limiting block. The sliding baffle and the limiting plate are respectively located on both sides of the sealing disk. The first fixed plate is fixed to the side of the sliding baffle, and the second fixed plate is fixed to the side of the sealing disk. The first fixed plate and the second fixed plate are connected by a first spring, and the counterweight is fixed to one end of the first fixed plate away from the sliding baffle.

[0014] As a preferred technical solution of the present invention, the driving structure includes a mounting frame, a rotating rod, a gear and a rack. The mounting frame is fixed to the side of the top cover, the rotating rod is rotatably mounted on the mounting frame, the gear is fixedly sleeved on the rotating rod, the rotating rod and the rotating shaft are connected through a transmission member, and the rack is fixed on the linear slide.

[0015] As a preferred technical solution of the present invention, the liquid collection structure includes a fixed plate, a sleeve, two wipers, two wiper strips and a collection container, the fixed plate is fixed inside the salt mist collection barrel, and a avoidance opening for adapting to the rotating shaft is opened in the middle position of the fixed plate, the sleeve is fixedly sleeved on the rotating shaft, the two wipers are connected to the sleeve, the two wiper strips are respectively arranged on the sides of the two wipers, each of the wiper strips is in contact with the surface of the fixed plate, the collection container is arranged on the side of the outer chassis, and the collection container is connected to the salt mist collection barrel through a hose.

[0016] As a preferred technical solution of the present invention, a plurality of first partition plates are fixed inside the outer chassis, a plurality of second partition plates are fixed inside the top cover, the plurality of first partition plates are respectively arranged opposite the plurality of second partition plates, a plurality of connecting tubes are fixed to the spray tube, each of the connecting tubes is connected to the interior of the spray tube, the spray head is detachably connected to the connecting tube, each of the second partition plates is provided with a conducting structure, and a pushing structure and a liquid absorbing structure are provided on the side of the outer chassis;

[0017] The conducting structure includes a through-port, a lifting plate, a first side plate and a second side plate. The through-port is opened at the bottom end of the second partition plate. The lifting plate is slidably arranged on the side of the second partition plate, and the lifting plate is arranged opposite to the through-port. The first side plate is fixed to the side of the second partition plate, and the second side plate is fixed to the side of the lifting plate. A first sealing cylinder is fixed to the first side plate, and a first sliding plug is sealingly and slidingly connected to the inside of the first sealing cylinder. A first connecting rod is fixed to the first sliding plug. The first connecting rod extends to the outside of the first sealing cylinder at one end away from the first sliding plug and is fixedly connected to the second side plate.

[0018] As a preferred technical solution of the present invention, the pushing structure includes a push plate, a slot and a movable plate. The push plate is fixed to the side of the linear slide, the slot is opened on the bottom surface of the push plate, the movable plate is slidably set in the slot, the movable plate and the top of the slot are connected by a second spring, and two inclined surfaces are provided at one end of the movable plate located outside the slot, and the inclination directions of the two inclined surfaces are opposite.

[0019] As a preferred technical solution of the present invention, the liquid suction structure includes a second sealing cylinder, a second sliding plug, a second connecting rod and a fixed block. The second sealing cylinder is fixed to the side of the outer chassis, and the second sliding plug is sealingly and slidingly connected to the inside of the second sealing cylinder. One end of the second connecting rod is fixed on the second sliding plug, and the other end extends to the outside of the second sealing cylinder. The fixed block is fixed to one end of the second connecting rod located outside the second sealing cylinder, and the fixed block is arranged opposite to one end of the movable plate located outside the slot. The second sealing cylinder is connected to the two first sealing cylinders through connecting pipes respectively.

[0020] As a preferred technical solution of the present invention, a blocking piece is provided in each of the connecting pipes, and a conducting piece is provided in each of the spray heads;

[0021] The blocking member includes a first bracket, a second bracket, a blocking block and a third spring. The first bracket and the second bracket are both fixed inside the connecting pipe. The first bracket and the second bracket are connected by a plurality of connecting strips. The first bracket is provided with a first through-hole, and the second bracket is provided with a second through-hole. The blocking block is arranged between the first bracket and the second bracket, and the blocking block is connected to the first bracket via the third spring.

[0022] The conducting member comprises a horizontal bar and a top rod, wherein the horizontal bar is fixed inside the spray head, and the top rod is fixed on the horizontal bar.

[0023] A method for detecting oxidation resistance of a printed circuit board comprises the following steps:

[0024] S1. Open the top cover of the salt spray tester, place the printed circuit board to be tested on the bracket, and add an appropriate amount of hydrochloric acid solution into the liquid filling pipe of the salt spray tester to prepare for the subsequent salt spray generation;

[0025] S2. Close the top cover to ensure the sealing structure is intact to prevent salt spray leakage. Adjust the position of the spray head on the spray tube according to the test requirements to set the salt spray concentration in different test areas.

[0026] S3. Start the salt spray tester. The gas compression device atomizes the hydrochloric acid solution and evenly sprays it onto the circuit board inside the top cover through the spray head. The salt spray test begins.

[0027] S4. During the test, observe and record the reaction of the circuit board to different salt spray concentrations, including oxidation and corrosion phenomena;

[0028] S5. After the test is completed, the linear drive module is started, and through a series of mechanical linkages, the salt mist collection unit extracts the salt mist inside the top cover and collects it in the salt mist collection cylinder;

[0029] S6. Check the collected salt spray solution and the circuit board surface, analyze the degree of oxidation, and evaluate the anti-oxidation performance of the circuit board.

[0030] The present invention has the following beneficial effects:

[0031] 1. The salt spray tester proposed in the present invention has the remarkable feature of having the function of recovering salt spray. After the test work is completed, the linear drive module is activated to drive the linear slide to move, thereby triggering a series of mechanical linkage reactions. This series of actions not only realizes the meshing of the rack and gear, but also drives the rotation of the rotating rod, transmission member and rotating shaft, and finally drives the axial flow blades in the draft member to perform the extraction action. This process effectively extracts the salt spray inside the top cover and guides it into the salt spray collection cylinder. In addition, while the rotating shaft rotates, it also drives the two wipers and wiper strips to rotate through the sleeve, continuously scraping the surface of the fixed disk. This design cleverly causes the salt spray to gather into liquid droplets, which flow down under the action of gravity and finally flow into the collection container through the hose, thereby realizing the complete collection of the salt spray solution inside the top cover. This salt spray recovery function not only ensures that the salt spray will not escape when the staff opens the top cover, effectively avoiding the potential harm of salt spray to the staff and the surrounding working environment, but also significantly reduces the waste of resources.

[0032] 2. The present invention introduces a partitioned detection function. This design overturns the traditional single integral test space model of the salt spray tester. By setting a plurality of first partitions inside the outer chassis and a plurality of second partitions inside the top cover, the test space is successfully divided into multiple independent and adjustable test areas. The staff can control the salt spray concentration in each test area by adjusting the position of the spray head on the spray tube. When a test area requires a higher salt spray concentration, it is only necessary to increase the number of spray heads in the area; conversely, if the salt spray concentration needs to be reduced, the number of spray heads is reduced. This flexible and adjustable design enables the formation of multiple test areas with different salt spray concentrations inside the top cover, providing a diverse test environment for salt spray testing of circuit boards.

[0033] 3. As for the design of the spray head, the present invention adopts a threaded connection method, which is screwed onto the connecting pipe. This design is not only stable and reliable, but also easy for staff to install and disassemble. A sealing piece is set inside the connecting pipe, and a conducting piece is set inside the spray head. The mutual cooperation of the two realizes flexible connection and sealing between the spray head and the spray pipe. This design enables staff to easily adjust the position of the spray head as needed, thereby controlling the salt spray concentration in the test area.

[0034] 4. Before the rack and gear engage, the lifting plate on each second partition has risen smoothly, ensuring that the salt mist inside the top cover can be fully extracted under the action of the salt mist collection unit. This design not only improves the efficiency and comprehensiveness of salt mist collection, but also avoids salt mist residue in the test area, thereby ensuring the accuracy and reliability of the test results. Through the ingenious coordination of the conduction structure, the liquid absorption structure and the pushing structure, the comprehensive collection of salt mist in each test area inside the top cover is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of a printed circuit board antioxidant testing device proposed by the present invention;

[0036] Figure 2 This is a schematic diagram of the structure when the top cover is opened;

[0037] Figure 3 for Figure 2 A magnified view of the structure at point A;

[0038] Figure 4 This is a structural diagram of the outer chassis from another perspective;

[0039] Figure 5 It is a schematic diagram of the cross-sectional structure of the salt mist collecting tube and the push plate;

[0040] Figure 6 for Figure 5 A magnified view of the structure at point B;

[0041] Figure 7 Schematic diagram of the structure of the top cover;

[0042] Figure 8 for Figure 7 A magnified view of the structure at point C;

[0043] Figure 9 Schematic diagram of the cross-sectional structure of the outer chassis;

[0044] Figure 10 for Figure 9 A magnified view of the structure at D;

[0045] Figure 11 for Figure 9A magnified view of the structure at E;

[0046] Figure 12 for Figure 2 A magnified view of the structure at F;

[0047] Figure 13 Schematic diagram of the cross-sectional structure of the connecting pipe and the spray head;

[0048] Figure 14 Schematic diagram of the liquid collecting structure.

[0049] In the figure: 11, outer case; 12, first partition; 13, gas compression device; 14, liquid filling pipe; 15, bracket; 21, top cover; 22, second partition; 23, spray pipe; 24, connecting pipe; 25, spray head; 31, opening; 32, induced draft tube; 33, salt mist collecting tube; 34, rotating shaft; 35, induced draft member; 41, sealing disk; 42, vent; 43, sliding baffle; 44, limit block; 45, limit plate; 46, first fixed plate; 47, second fixed plate; 48, first spring; 49, counterweight; 5, linear drive module; 6, linear slide; 71, mounting bracket; 72, rotating rod; 73, gear; 74, transmission member; 75, rack; 8 1. Fixed plate; 82. Sleeve; 83. Wiper plate; 84. Wiper strip; 85. Collecting container; 86. Hose; 91. Through port; 92. Lifting plate; 93. First side plate; 94. Second side plate; 95. First sealing cylinder; 96. First sliding plug; 97. First connecting rod; 101. Push plate; 102. Slot; 103. Movable plate; 104. Second spring; 111. Second sealing cylinder; 112. Second sliding plug; 113. Second connecting rod; 114. Fixed block; 121. First bracket; 122. Through port 1; 123. Second bracket; 124. Through port 2; 125. Connecting strip; 126. Block; 127. Third spring; 128. Horizontal bar; 129. Push rod. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0051] Example 1

[0052] Reference Figure 1 - Figure 14 A printed circuit board antioxidant testing device includes a salt spray tester and a salt spray collection unit. The salt spray tester includes an outer case 11, a gas compression device 13, a liquid filling pipe 14 and a bracket 15. The bracket 15 is fixed to the top of the outer case 11. The bracket 15 is provided with a plurality of holes. The gas compression device 13 and the liquid filling pipe 14 are both arranged on the outer case 11 (such as Figure 9 As shown), it is used to atomize the salt spray solution. A linear drive module 5 is installed on the side of the outer chassis 11, and a linear slide 6 is assembled on the linear drive module 5. The outer chassis 11 is also provided with a rotatable top cover structure, which includes a top cover 21 and a spray pipe 23. The top cover 21 is rotatably mounted on the outer chassis 11, and the spray pipe 23 is fixed inside the top cover 21. The spray pipe 23 is connected to the gas compression device 13 and is provided with a plurality of spray heads 25.

[0053] The salt mist collecting unit includes a recovery structure, a sealing structure, a driving structure and a liquid collecting structure. The recovery structure is used to absorb the salt mist inside the top cover 21. The recovery structure includes an opening 31, an air duct 32, a salt mist collecting cylinder 33, a rotating shaft 34 and an air duct 35. The opening 31 (such as Figure 8 As shown in the figure, an air induced draft member 35 is provided on the side of the top cover 21, an air induced draft member 32 is fixed in the opening 31, a salt mist collecting cylinder 33 is fixed on the side of the top cover 21, and the salt mist collecting cylinder 33 is arranged opposite the opening 31, a rotating shaft 34 is rotatably mounted inside the salt mist collecting cylinder 33, and the rotating shaft 34 and the salt mist collecting cylinder 33 are coaxially arranged, one end of the rotating shaft 34 extends through the opening 31 to the inside of the top cover 21, an air induced draft member 35 is fixed to one end of the rotating shaft 34 located inside the top cover 21, and the air induced draft member 35 is composed of an end cap and a plurality of axial flow blades, the end cap is fixed to one end of the rotating shaft 34 located inside the top cover 21, the plurality of axial flow blades are all fixed on the end cap, and the plurality of axial flow blades are distributed in a circumferential array.

[0054] The sealing structure is used to seal the top cover 21. The sealing structure includes a sealing disc 41 and several sealing members. A hole is opened in the middle of the sealing disc 41. The sealing disc 41 is fixedly sleeved on the rotating shaft 34, and the sealing disc 41 is located inside the opening 31. Each sealing member is set on the sealing disc 41, and the several sealing members are distributed in a circumferential array; the sealing member includes a vent 42, a sliding baffle 43, a first fixed plate 46, a second fixed plate 47 and a counterweight 49. The vent 42 is opened on the side of the sealing disc 41, the sliding baffle 43 is slidably set on the sealing disc 41, and the sliding baffle The plate 43 is arranged opposite to the vent 42, and a limiting block 44 is fixed on the side of the sliding baffle 43. The limiting block 44 slides in the vent 42, and a limiting plate 45 is fixedly sleeved on the limiting block 44. The sliding baffle 43 and the limiting plate 45 are respectively located on both sides of the sealing disk 41, the first fixed plate 46 is fixed on the side of the sliding baffle 43, and the second fixed plate 47 is fixed on the side of the sealing disk 41. The first fixed plate 46 and the second fixed plate 47 are connected by a first spring 48, and the counterweight block 49 is fixed on the end of the first fixed plate 46 away from the sliding baffle 43.

[0055] The driving structure is used to drive the recovery structure to operate. The driving structure includes a mounting frame 71, a rotating rod 72, a gear 73 and a rack 75. The mounting frame 71 is fixed to the side of the top cover 21 (such as Figure 5 、 Figure 9 and Figure 12 As shown, the rotating rod 72 is rotatably mounted on the mounting frame 71, the gear 73 is fixedly sleeved on the rotating rod 72, the rotating rod 72 and the rotating shaft 34 are connected to each other through a transmission member 74, and the rack 75 is fixed on the linear slide 6 (as shown Figure 4 shown).

[0056] The liquid collection structure is used to collect salt mist solution. The liquid collection structure includes a fixed plate 81, a sleeve 82, two wipers 83, two wiper strips 84 and a collection container 85. The fixed plate 81 is fixed inside the salt mist collection barrel 33, and a avoidance opening for adapting to the rotating shaft 34 is opened in the middle position of the fixed plate 81. The sleeve 82 is fixedly sleeved on the rotating shaft 34. The two wipers 83 are connected to the sleeve 82. The two wiper strips 84 are respectively arranged on the sides of the two wipers 83. Each wiper strip 84 is in contact with the surface of the fixed plate 81. The collection container 85 is arranged on the side of the outer chassis 11. The collection container 85 is connected to the salt mist collection barrel 33 through a hose 86.

[0057] In this embodiment, the staff first opens the top cover 21, then places the circuit board to be tested on the bracket 15, and then fills the hydrochloric acid solution into the liquid filling pipe 14. When testing, the staff covers the top cover 21. Under the action of the gas compression device 13, the hydrochloric acid solution is atomized and enters the spray pipe 23, and finally sprayed out through a number of spray heads 25, so that the salt mist is evenly distributed inside the top cover 21. In this case, the circuit board is in a salt spray environment and can be subjected to a salt spray test. It should be noted that the specific principle of the gas compression device 13 atomizing the hydrochloric acid solution is proposed as a prior art, which is not shown in the figure and will not be described in detail here.

[0058] The salt spray tester proposed in the present invention has the function of recovering salt spray. Specifically, after the test work is completed, the staff starts the linear drive module 5, so that the linear drive module 5 drives the linear slide 6 to move. In the initial state, the linear slide 6 is located at the end position of the linear drive module 5. At this time, the rack 75 is located away from the gear 73. When the linear slide 6 moves, the rack 75 moves accordingly and gradually approaches the gear 73. As the linear slide 6 moves, the rack 75 will mesh with the gear 73 and drive the gear 73 to rotate. The gear 73 is rotated. When the rotating rod 72 rotates, the rotating rod 72 drives the rotating shaft 34 to rotate through the transmission member 74. The air inducing member 35 connected to the rotating shaft 34 also rotates accordingly. The air inducing member 35 includes a plurality of axial flow blades. Therefore, the plurality of axial flow blades can perform a pumping action when rotating and extract the salt mist inside the top cover 21. Under the action of the air inducing member 35, the salt mist inside the top cover 21 is drawn into the salt mist collecting cylinder 33 and adheres to the surface of the fixed plate 81. The surface of the fixed plate 81 is smooth and flat, which facilitates the uniform adhesion of the salt mist. Furthermore, when the rotating shaft 34 rotates, it can also drive the two wiper blades 83 to rotate through the sleeve 82. When the two wiper blades 83 rotate, the two wiper strips 84 can continuously scrape the surface of the fixed disk 81. The scraping action of the two wiper strips 84 can cause the salt mist to gather into liquid droplets, and flow down from the surface of the fixed disk 81 under the action of gravity. In summary, under the cooperation of the two wiper strips 84, the salt mist attached to the surface of the fixed disk 81 can flow into the interior of the collection container 85 through the hose 86, so as to realize the collection of the salt mist solution inside the top cover 21. After the salt mist is drawn out from the inside of the top cover 21, the salt mist will not dissipate when the staff opens the top cover 21, thereby avoiding the salt mist from causing harm to the staff and the surrounding working environment. At the same time, the recovery of the salt mist can reduce the waste of resources.

[0059] In the present invention, the opening 31 on the top cover 21 provides a salt mist recovery channel, but the existence of the opening 31 also makes the top cover 21 unable to be in a sealed state. In order to prevent salt mist from escaping through the opening 31 during the salt spray test, the present invention designs a sealing structure at the opening 31. As for the sealing structure, when the circuit board is subjected to a salt spray test, the rotating shaft 34 and the air inducing member 35 are both in a stationary state. In this case, under the elastic force of the first spring 48, the first fixed plate 46 is located near the rotating shaft 34. At this time, the limit block 44 is located at one end of the vent 42 close to the rotating shaft 34, and the sliding baffle 43 completely blocks the vent 42. Under the blocking action of the sliding baffle 43, the fixed disk 81 and the plurality of sliding baffles 43 jointly form a closed surface, which can block the opening 31, thereby ensuring the overall sealing performance of the top cover 21 and preventing salt mist from leaking through the opening 31 during the test. When the rotating shaft 34 drives the air-inducing member 35 to rotate, the rotating shaft 34 can also drive the fixed disk 81 to rotate. During the rotation of the fixed disk 81, the first fixed plate 46 can slide in the direction away from the rotating shaft 34 under the action of centrifugal force, and drive the sliding baffle 43 to slide in the direction away from the rotating shaft 34, so that the sliding baffle 43 is staggered with the vent 42. At this time, the sliding baffle 43 no longer blocks the vent 42, and the salt mist can enter the interior of the salt mist collecting cylinder 33 through the several vents 42. It is worth mentioning that during the movement of the sliding baffle 43, the limit block 44 slides in the vent 42, which limits the movement of the sliding baffle 43 and ensures the stability of the movement of the sliding baffle 43. In addition, the setting of the limit plate 45 can prevent the sliding baffle 43 from detaching from the sealing disk 41. Secondly, a counterweight block 49 is fixed on the first fixed plate 46. The setting of the counterweight block 49 is conducive to overcoming the elastic force of the first spring 48 acting on the first fixed plate 46, so that the sliding baffle 43 can move smoothly. Based on the above process, when the rotating shaft 34 is stationary, several sliding baffles 43 respectively block several vents 42, so that the top cover 21 is in a closed state as a whole. When the rotating shaft 34 rotates, several sliding baffles 43 move synchronously under the action of centrifugal force and are staggered with several vents 42. At this time, salt mist can enter the salt mist collecting cylinder 33 through several vents 42, thereby realizing the recovery of salt mist.

[0060] Example 2

[0061] Reference Figure 1 、 3 , 5, 6, 9 and 11, a plurality of first partition plates 12 are fixed inside the outer chassis 11, a plurality of second partition plates 22 are fixed inside the top cover 21, a plurality of first partition plates 12 are respectively arranged opposite to a plurality of second partition plates 22, a plurality of connecting tubes 24 are fixed on the spray tube 23, each connecting tube 24 is connected to the inside of the spray tube 23, the spray head 25 is detachably connected to the connecting tube 24, and a conducting structure is provided on each second partition plate 22.

[0062] The conducting structure includes a through-port 91, a lifting plate 92, a first side plate 93 and a second side plate 94. The through-port 91 is opened at the bottom end of the second partition plate 22. The lifting plate 92 is slidingly arranged on the side of the second partition plate 22, and the lifting plate 92 is arranged opposite to the through-port 91. The first side plate 93 is fixed on the side of the second partition plate 22. The second side plate 94 is fixed on the side of the lifting plate 92. A first sealing tube 95 is fixed on the first side plate 93. The first sealing tube 95 is internally sealed and slidably connected to a first sliding plug 96. A first connecting rod 97 is fixed on the first sliding plug 96. The first connecting rod 97 extends from one end of the first sliding plug 96 to the outside of the first sealing tube 95 and is fixedly connected to the second side plate 94.

[0063] The side of the outer chassis 11 is provided with a pushing structure and a liquid suction structure. The pushing structure includes a push plate 101, a slot 102 and a movable plate 103. The push plate 101 is fixed to the side of the linear slide 6. The slot 102 is provided on the bottom surface of the push plate 101. The movable plate 103 is slidably provided in the slot 102. The movable plate 103 is connected to the slot top of the slot 102 by a second spring 104. The end of the movable plate 103 located outside the slot 102 is provided with two inclined surfaces. The inclined directions of the two inclined surfaces are opposite. The liquid suction structure includes a second sealing cylinder 111, a second sliding plug 112, a second The connecting rod 113 and the fixed block 114, the second sealing cylinder 111 are fixed to the side of the outer chassis 11, the second sliding plug 112 is sealingly and slidingly connected to the inside of the second sealing cylinder 111, one end of the second connecting rod 113 is fixed on the second sliding plug 112, and the other end extends to the outside of the second sealing cylinder 111, the fixed block 114 is fixed to the end of the second connecting rod 113 located outside the second sealing cylinder 111, and the fixed block 114 is arranged opposite to the end of the movable plate 103 located outside the groove 102, and the second sealing cylinder 111 is connected to the two first sealing cylinders 95 through connecting pipes.

[0064] A blocking piece is provided in each connecting tube 24, and a conducting piece is provided in each spray head 25; the blocking piece includes a first bracket 121, a second bracket 123, a blocking block 126 and a third spring 127. The first bracket 121 and the second bracket 123 are both fixed inside the connecting tube 24, and the first bracket 121 and the second bracket 123 are connected by a plurality of connecting strips 125. A through-hole 122 is provided on the first bracket 121, and a through-hole 2 124 is provided on the second bracket 123. The blocking block 126 is provided between the first bracket 121 and the second bracket 123, and the blocking block 126 is connected to the first bracket 121 through the third spring 127; the conducting piece includes a horizontal bar 128 and a push rod 129. The horizontal bar 128 is fixed inside the spray head 25, and the push rod 129 is fixed on the horizontal bar 128.

[0065] On the basis of Example 1, the present invention also provides a partition detection function. This design replaces the traditional salt spray tester with an integral test space. Several first partitions 12 divide the interior of the outer chassis 11 into several independent spaces, and several second partitions 22 divide the interior of the top cover 21 into several independent test areas. The staff can adjust the concentration of the salt spray inside each test area by adjusting the position of the spray head 25 on the spray tube 23. When the number of spray heads 25 in a test area increases, the salt spray concentration in the test area increases accordingly. Conversely, when the number of spray heads 25 in a test area decreases, the salt spray concentration in the test area decreases accordingly. Through this design, multiple test areas with adjustable salt spray concentrations can be formed inside the top cover 21. This design can provide different test environments for salt spray testing of circuit boards. It should be noted that when the top cover 21 is closed on the outer chassis 11, each second partition 22 is in contact with the bracket 15, and the several second partitions 22 are respectively arranged opposite the several first partitions 12 to form multiple independent test areas.

[0066] For the spray head 25, the spray head 25 is screwed onto the connecting pipe 24 by a threaded connection. A blocking piece is provided inside the connecting pipe 24, and a conducting piece is provided inside the spray head 25. When the spray head 25 is connected to the connecting pipe 24, the blocking piece and the conducting piece cooperate with each other to connect the spray head 25 with the spray pipe 23 through the connecting pipe 24. When the spray head 25 is not connected to the connecting pipe 24, the connecting pipe 24 is in a closed state under the action of the blocking piece. At this time, the salt mist cannot be sprayed out through the connecting pipe 24. Specifically, when the spray head 25 is not connected to the connecting pipe 24, the blocking block 126 is in a state of pressing the second bracket 123 under the elastic force of the third spring 127. At this time, The block 126 blocks the second through-hole 124. In this case, the salt mist in the spray tube 23 cannot be sprayed out through the connecting tube 24. When the mist head is connected to the connecting tube 24, the push rod 129 inside the spray head 25 will be inserted into the second through-hole 124 and push the block 126 upward, causing the block 126 to move upward. When the block 126 moves upward, the block 126 no longer blocks the second through-hole 124. At this time, the salt mist in the spray tube 23 can enter the spray head 25 through the first through-hole 122 and the second through-hole 124, and finally be sprayed out through the spray head 25. This design facilitates the staff to flexibly adjust the position of the spray head 25 on the spray tube 23, and thus flexibly adjust the salt mist concentration in each test area.

[0067] Since a second partition plate 22 is provided in the top cover 21, and the second partition plates 22 divide the interior of the top cover 21 into a plurality of test areas, in order to enable the salt mist collection unit to extract the salt mist in each test area, the present invention provides a conduction structure on each partition plate, and at the same time provides a liquid suction structure and a pushing structure on the outer chassis 11. Specifically, when the linear slide 6 drives the rack 75 to move, before the rack 75 and the gear 73 engage with each other, the movable plate 103 on the side of the linear slide 6 first contacts the fixed block 114 and pushes the fixed block 114 to move. When the second connecting rod 113 moves, although the bottom end of the movable plate 103 is provided with an inclined surface, the friction between the second sliding plug 112 and the second sealing cylinder 111 cannot overcome the elastic force applied by the second spring 104 to the movable plate 103, which enables the movable plate 103 to smoothly push the second connecting rod 113 to move, so that the second connecting rod 113 drives the second sliding plug 112 to move. When the second sliding plug 112 moves, it can extract the gas in the two first sealing cylinders 95 through the two connecting pipes. When the gas in the first sealing cylinder 95 is extracted, the first sliding plug 95 is opened. 6 will move upward under the action of negative pressure and drive the first connecting rod 97 to move. When the first connecting rod 97 moves, it drives the lifting plate 92 to move upward through the second side plate 94. When the lifting plate 92 moves upward, the lifting plate 92 no longer blocks the through-port 91. Based on the above process, before the rack 75 is engaged with the gear 73, under the cooperation of the conducting structure, the liquid absorbing structure and the pushing structure, the lifting plate 92 on each second partition plate 22 can move upward, so that each test area inside the top cover 21 is connected through a plurality of through-ports 91. In this case, the salt mist collection unit can fully extract the salt mist inside the top cover 21. It is worth noting that when the second sliding plug 112 moves to the end position of the second sealing cylinder 111, the second sliding plug 112 cannot continue to move. At this time, the fixed block 114 and the inclined surface of the movable plate 103 will squeeze each other, and the movable plate 103 will move upward under the action of its inclined surface and retract into the interior of the slot 102. The movable characteristic of the movable plate 103 can avoid the phenomenon of motion interference between the movable plate 103 and the fixed block 114, so as to ensure the stable operation of the device.

[0068] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A printed circuit board antioxidant detection device, characterized in that: Including salt spray test machine and salt spray collection unit; The salt spray tester comprises an outer case (11), a gas compression device (13), a liquid filling pipe (14) and a bracket (15), wherein the bracket (15) is fixed on the top of the outer case (11), and a plurality of holes are provided on the bracket (15). The gas compression device (13) and the liquid filling pipe (14) are both arranged on the outer case (11) for atomizing the salt spray solution. A linear drive module (5) is installed on the side of the outer case (11). A linear slide (6) is mounted on the linear drive module (5), and a rotatable top cover structure is further provided on the outer case (11), wherein the top cover structure comprises a top cover (21) and a spray pipe (23), wherein the top cover (21) is rotatably mounted on the outer case (11), and the spray pipe (23) is fixed inside the top cover (21), and the spray pipe (23) is connected to the gas compression device (13), and a plurality of spray heads (25) are provided on the spray pipe (23); The salt mist collection unit comprises a recovery structure, a sealing structure, a driving structure and a liquid collection structure, wherein the recovery structure is used to absorb the salt mist inside the top cover (21), the sealing structure is used to seal the top cover (21), the driving structure is used to drive the recovery structure to operate, and the liquid collection structure is used to collect the salt mist solution; The recovery structure includes an opening (31), an air induced duct (32), a salt mist collecting cylinder (33), a rotating shaft (34) and an air inducing member (35), wherein the opening (31) is opened on the side of the top cover (21), the air induced duct (32) is fixed in the opening (31), the salt mist collecting cylinder (33) is fixed on the side of the top cover (21), and the salt mist collecting cylinder (33) is arranged opposite to the opening (31), the rotating shaft (34) is rotatably installed inside the salt mist collecting cylinder (33), and the rotating shaft (34) is coaxially arranged with the salt mist collecting cylinder (33), one end of the rotating shaft (34) passes through the opening (31) and extends to the inside of the top cover (21), the air inducing member (35) is fixed to the end of the rotating shaft (34) located inside the top cover (21), the air inducing member (35) is composed of an end cap and a plurality of axial flow blades, the end cap is fixed to the end of the rotating shaft (34) located inside the top cover (21), the plurality of axial flow blades are fixed on the end cap, and the plurality of axial flow blades are distributed in a circumferential array; A plurality of first partition plates (12) are fixed inside the outer case (11), a plurality of second partition plates (22) are fixed inside the top cover (21), the plurality of first partition plates (12) are respectively arranged opposite to the plurality of second partition plates (22), a plurality of connecting pipes (24) are fixed on the spray pipe (23), each of the connecting pipes (24) is connected to the inside of the spray pipe (23), the spray head (25) is detachably connected to the connecting pipe (24), a conducting structure is provided on each of the second partition plates (22), and a pushing structure and a liquid absorbing structure are provided on the side of the outer case (11); The conduction structure includes a through-hole (91), a lifting plate (92), a first side plate (93) and a second side plate (94), wherein the through-hole (91) is opened at the bottom end of the second partition plate (22), the lifting plate (92) is slidably arranged on the side of the second partition plate (22), and the lifting plate (92) is arranged opposite to the through-hole (91), the first side plate (93) is fixed on the side of the second partition plate (22), the second side plate (94) is fixed on the side of the lifting plate (92), a first sealing cylinder (95) is fixed on the first side plate (93), the first sealing cylinder (95) is sealingly and slidingly connected to a first sliding plug (96) inside, a first connecting rod (97) is fixed on the first sliding plug (96), and the first connecting rod (97) extends from one end of the first sliding plug (96) to the outside of the first sealing cylinder (95) and is fixedly connected to the second side plate (94).

2. The printed circuit board antioxidant testing device according to claim 1, characterized in that: The sealing structure includes a sealing disk (41) and a plurality of sealing members. A hole is provided in the middle of the sealing disk (41). The sealing disk (41) is fixedly sleeved on the rotating shaft (34), and the sealing disk (41) is located inside the opening (31). Each of the sealing members is provided on the sealing disk (41), and the plurality of sealing members are distributed in a circumferential array. The sealing member includes a vent (42), a sliding baffle (43), a first fixed plate (46), a second fixed plate (47) and a counterweight (49), wherein the vent (42) is opened on the side of the sealing disk (41), the sliding baffle (43) is slidably arranged on the sealing disk (41), and the sliding baffle (43) is arranged opposite to the vent (42), and a limiting block (44) is fixed on the side of the sliding baffle (43), and the limiting block (44) slides in the vent (42). 4) The upper fixed sleeve is provided with a limit plate (45), the sliding baffle (43) and the limit plate (45) are respectively located on both sides of the sealing disk (41), the first fixed plate (46) is fixed to the side of the sliding baffle (43), the second fixed plate (47) is fixed to the side of the sealing disk (41), the first fixed plate (46) and the second fixed plate (47) are connected by a first spring (48), and the counterweight (49) is fixed to one end of the first fixed plate (46) away from the sliding baffle (43).

3. The printed circuit board antioxidant testing device according to claim 1, characterized in that: The driving structure comprises a mounting frame (71), a rotating rod (72), a gear (73) and a rack (75); the mounting frame (71) is fixed to the side of the top cover (21); the rotating rod (72) is rotatably mounted on the mounting frame (71); the gear (73) is fixedly sleeved on the rotating rod (72); the rotating rod (72) and the rotating shaft (34) are connected to each other through a transmission member (74); and the rack (75) is fixed to the linear slide (6).

4. The printed circuit board antioxidant testing device according to claim 1, characterized in that: The liquid collecting structure comprises a fixed plate (81), a sleeve (82), two wipers (83), two wiper strips (84) and a collecting container (85), wherein the fixed plate (81) is fixed inside the salt mist collecting barrel (33), and a relief opening adapted to the rotating shaft (34) is provided at the middle position of the fixed plate (81), the sleeve (82) is fixedly sleeved on the rotating shaft (34), the two wipers (83) are connected to the sleeve (82), the two wiper strips (84) are respectively arranged on the sides of the two wipers (83), and each of the wiper strips (84) is in contact with the surface of the fixed plate (81), the collecting container (85) is arranged on the side of the outer case (11), and the collecting container (85) is connected to the salt mist collecting barrel (33) through a hose (86).

5. The printed circuit board antioxidant testing device according to claim 4, characterized in that: The pushing structure includes a push plate (101), a slot (102) and a movable plate (103), wherein the push plate (101) is fixed on the side of the linear slide (6), the slot (102) is provided on the bottom surface of the push plate (101), the movable plate (103) is slidably arranged in the slot (102), the movable plate (103) and the slot top of the slot (102) are connected via a second spring (104), and one end of the movable plate (103) located outside the slot (102) is provided with two inclined surfaces, and the inclination directions of the two inclined surfaces are opposite.

6. The printed circuit board antioxidant testing device according to claim 5, characterized in that: The liquid suction structure includes a second sealing cylinder (111), a second sliding plug (112), a second connecting rod (113) and a fixed block (114), wherein the second sealing cylinder (111) is fixed to the side of the outer chassis (11), the second sliding plug (112) is sealingly and slidingly connected to the inside of the second sealing cylinder (111), one end of the second connecting rod (113) is fixed to the second sliding plug (112), and the other end extends to the outside of the second sealing cylinder (111), the fixed block (114) is fixed to the end of the second connecting rod (113) located outside the second sealing cylinder (111), and the fixed block (114) is arranged opposite to the end of the movable plate (103) located outside the slot (102), and the second sealing cylinder (111) and the two first sealing cylinders (95) are respectively connected through connecting pipes.

7. The printed circuit board antioxidant testing device according to claim 6, characterized in that: Each of the connecting pipes (24) is provided with a blocking member, and each of the spray heads (25) is provided with a conducting member; The blocking member includes a first bracket (121), a second bracket (123), a blocking block (126) and a third spring (127). The first bracket (121) and the second bracket (123) are both fixed inside the connecting tube (24). The first bracket (121) and the second bracket (123) are connected via a plurality of connecting strips (125). The first bracket (121) is provided with a first through-hole (122), and the second bracket (123) is provided with a second through-hole (124). The blocking block (126) is provided between the first bracket (121) and the second bracket (123). The blocking block (126) is connected to the first bracket (121) via the third spring (127). The conducting member comprises a horizontal bar (128) and a top rod (129), wherein the horizontal bar (128) is fixed inside the spray head (25), and the top rod (129) is fixed on the horizontal bar (128).

8. A printed circuit board antioxidant testing method, using the printed circuit board antioxidant testing device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Open the top cover (21) of the salt spray tester, place the printed circuit board to be tested on the bracket (15), and add an appropriate amount of hydrochloric acid solution into the liquid filling pipe (14) of the salt spray tester to prepare for the subsequent salt spray generation; S2. Close the top cover (21) and adjust the position of the spray head (25) on the spray tube (23) according to the test requirements to set the salt spray concentration in different test areas; S3, start the salt spray test machine, the gas compression device (13) atomizes the hydrochloric acid solution, and evenly sprays it on the circuit board inside the top cover (21) through the spray head (25), and the salt spray test begins; S4. During the test, observe and record the reaction of the circuit board to different salt spray concentrations, including oxidation and corrosion phenomena; S5. After the test is completed, the linear drive module (5) is started, and through a series of mechanical linkages, the salt mist collection unit extracts the salt mist inside the top cover (21) and collects it in the salt mist collection cylinder (33); S6. Check the collected salt spray solution and the circuit board surface, analyze the degree of oxidation, and evaluate the anti-oxidation performance of the circuit board.

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