Circuit board clamping jig and circuit board coating and curing production line

Abstract

The application relates to a circuit board clamping jig and a circuit board coating and curing production line. The circuit board clamping jig comprises a jig frame, the jig frame is formed with a fixing area, the fixing area is used for mounting a circuit board, at least two side edges of the fixing area are respectively swingably provided with a rocker arm, a clamping groove is arranged between the rocker arm and the side edge of the fixing area, and the side edge of the fixing area is provided with a fixing assembly used for adsorbing and fixing the rocker arm. The circuit board coating and curing production line comprises a coating machine used for coating three-proof paint on a circuit board clamped by the circuit board clamping jig; a curing furnace used for curing the circuit board coated with the three-proof paint by the coating machine; a turnover mechanism used for clamping and overturning the circuit board clamping jig on which the circuit board coated with the three-proof paint on one side is placed; and a conveying mechanism used for sequentially conveying the circuit board clamping jig through the coating machine, the curing furnace, the turnover mechanism, the coating machine and the curing furnace. The application effectively optimizes the fixing efficiency of the circuit board.

Description

Technical Field

[0001] This application relates to the field of circuit board fixture technology, and in particular to a circuit board clamping fixture and a circuit board coating and curing production line. Background Technology

[0002] Circuit boards are used to integrate circuits in electronic and electrical products. Because of their high degree of integration and the presence of various electrical components, circuit boards are susceptible to corrosion from environmental factors such as dust, moisture, mold, salt spray, and corrosive gases. This can lead to corrosion, softening, deformation, and mold growth on the circuit board and its electronic components, resulting in malfunctions such as leakage, short circuits, and component failure. Therefore, to optimize reliability during use, after the circuit board passes inspection during manufacturing, it is coated with conformal coating to protect against moisture, mold, and salt spray corrosion, thus extending its lifespan.

[0003] In the current circuit board production process, due to the relatively high cost of automated inspection instruments and systems, most circuit board inspections are still conducted manually with the aid of simple optical inspection instruments. Therefore, after passing inspection, the circuit board needs to be placed back into a fixture before applying conformal coating.

[0004] Because double-sided conformal coating is required, existing fixtures are mostly frame-like structures, with circuit boards fixed to the frame using multiple screws. When fixing the circuit board to the fixture, the board is located within the frame, and multiple screws are inserted through mounting holes located on the outer side of the circuit board's electrical boundary to secure it. However, in actual manufacturing processes, circuit board production batches are often relatively large. If each circuit board needs to be threaded to the fixture frame with multiple screws during the fixing process, the fixing efficiency will be relatively low. Summary of the Invention

[0005] To optimize the efficiency of circuit board fixing, this application provides a circuit board clamping fixture and a circuit board coating and curing production line.

[0006] This application provides a circuit board clamping fixture and a circuit board coating and curing production line, which adopts the following technical solution:

[0007] In a first aspect, this application provides a circuit board clamping fixture, which adopts the following technical solution:

[0008] A circuit board clamping fixture includes a fixture frame, the fixture frame having at least one adjustable area for mounting a circuit board, the fixed area having rocker arms swayably disposed on at least two sides of the fixed area, a clamping groove for clamping the edge of the circuit board being formed between the rocker arms and the side edge of the fixed area, and a fixing component for adsorbing and fixing the rocker arms being disposed on the side edge of the fixed area.

[0009] By adopting the above technical solution, when it is necessary to apply conformal coating to the circuit board, simply place the circuit board in the fixing area, ensuring that the side edge of the circuit board overlaps the inner wall of the clamping groove. Then, rotate the rocker arm to press the side edge of the circuit board into the clamping groove. Finally, fix the rocker arm to the side edge of the fixing area using the fixing component to complete the circuit board fixing. Compared with fixing the circuit board with multiple screws, fixing the circuit board by rotating the rocker arm can effectively simplify the process of fixing the circuit board, thereby improving the efficiency of circuit board fixing. At the same time, the area of ​​the fixing area is adjustable and can also adapt to circuit boards of different sizes, thereby optimizing the circuit board fixing efficiency and reducing the frequency of changing the circuit board clamping fixture due to changes in circuit board specifications.

[0010] Optionally, the fixing component includes several magnetic suction elements fixedly connected to the side edge of the fixing area, and the rocker arm is made of magnetic material.

[0011] By adopting the above technical solution, when the rocker arm is closed in the clamping groove and the circuit board is pressed into the clamping groove, the magnetic component will attract the rocker arm to the side edge of the fixing area, thereby further reducing the steps of fixing the circuit board and optimizing the efficiency of fixing the circuit board.

[0012] Optionally, a limiting protrusion is fixedly connected to the side edge of the fixed area, and the rocker arm has a limiting port that cooperates with the limiting protrusion. The limiting protrusion is located on the swing path of the limiting port as the rocker arm swings.

[0013] By adopting the above technical solution, when the rocker arm rotates to the edge of the opening of the clamping groove, it can abut against the inner wall of the limiting port through the limiting protrusion, thereby limiting the rotation of the rocker arm and reducing the possibility of the circuit board becoming loose due to excessive rotation of the rocker arm.

[0014] Optionally, the fixture frame is slidably provided with a cantilever, the sliding direction of the cantilever is perpendicular to the length direction of the cantilever, the fixed area is formed between the cantilever and the frame edge of the fixture frame, the rocker arm is rotatably provided on the frame edge of the cantilever or the fixture frame, and the cantilever or the fixture frame is provided with a locking member that locks the cantilever sliding.

[0015] By adopting the above technical solution, when it is necessary to adjust the area of ​​the fixing area, simply slide the cantilever to make the formed fixing area fit the specifications and dimensions of the circuit board, and then use the locking component to make the cantilever slide and lock relative to the fixture frame. At the same time, when the cantilever is slid and locked by the locking component, the area of ​​the fixing area can also be fixed after the conformal coating of the circuit board is applied. When fixing circuit boards of the same specifications in the future, simply swing the rocker arm, thereby reducing the frequency of changing the circuit board clamping fixture and optimizing the efficiency of circuit board fixing.

[0016] Optionally, the locking element includes a locking block and a locking bolt threaded to the locking block. The locking block is slidably connected to the frame edge of the fixture frame in a direction perpendicular to the length of the cantilever. The locking bolt passes through the cantilever and the locking block, and the frame edge of the fixture frame is clamped between the locking block and the cantilever.

[0017] By adopting the above technical solution, when it is necessary to slide and lock the cantilever, simply rotate the locking bolt and engage the locking block with the frame edge of the fixture frame, so that the end of the cantilever is fastened to the frame edge of the fixture frame, thereby achieving the effect of sliding and locking the cantilever.

[0018] Optionally, a limiting member is provided on the edge of the fixed area. The limiting member includes a limiting block that is slidably connected to the side edge of the fixed area and a limiting bolt for fastening the limiting block to the side edge of the fixed area. The limiting bolt passes through the limiting block and the side edge of the fixed area.

[0019] By adopting the above technical solution, when circuit boards of different specifications and sizes are placed in the fixed area, there will be a gap between the circuit board and the edge of the fixed area corresponding to the end of the rocker arm. In this case, in order to fix the circuit board in a relatively fixed position in the fixed area, it is only necessary to slide the limiting block so that the limiting block abuts against the edge of the circuit board, and then rotate the limiting bolt to make the limiting block slide and lock, thereby fixing the circuit board in a relatively fixed position in the fixed area.

[0020] Optionally, the fixture frame is provided with a fastening assembly for limiting the swing end of the rocker arm. The fastening assembly includes several fastening pins, an airbag for pushing the fastening pins into the rocker arm end, and a squeezing member for squeezing the airbag on both sides in the thickness direction of the fixture frame. The fastening pins are slidably connected to the cantilever, the airbags are embedded inside the fixture frame, and the telescopic ends of the airbags are connected to fastening strips. The fastening pins are located on the telescopic path of the fastening strips, and the squeezing member is provided on the fixture frame.

[0021] By adopting the above technical solution, when applying conformal coating, both sides of the circuit board need to be coated with conformal coating. After applying conformal coating to one side of the circuit board, the other side of the circuit board needs to be coated with conformal coating. During this process, the fixture frame needs to be flipped. At this time, the side frame edge of the fixture frame needs to be clamped. Meanwhile, the thickness direction of the fixture frame is aligned with the center of the fixture frame to press the extrusion member. At this time, the airbags are squeezed from both sides, and the expansion and contraction of the airbags cause the fastening strips to slide. The sliding fastening strips will push the fastening pins to insert or abut against the cantilever, thereby limiting the swing of the rocker arm and reducing the possibility of the rocker arm loosening due to flipping the fixture frame.

[0022] Optionally, the extrusion component includes two extrusion plates, the frame edge of the fixture frame is clamped between the two extrusion plates, the extrusion plates are fixedly connected to extrusion columns perpendicular to the extrusion plates, the extrusion columns are inserted and slidably connected to the fixture frame, and the extrusion columns abut against the airbag.

[0023] By adopting the above technical solution, when the frame edge of the fixture is clamped, the two extrusion plates will move towards each other, thereby extruding the airbag from both sides. In addition, when the flipping action is not performed, because the fixture frame is coated with conformal coating, the extrusion plate on one side of the fixture frame is subjected to the gravity of the fixture frame. At this time, the force of the fixing pin against the rocker arm is relatively small, thereby reducing the impact on the fixing circuit board.

[0024] Secondly, this application provides a circuit board coating and curing production line, which adopts the following technical solution:

[0025] A circuit board coating and curing production line, comprising:

[0026] A coating machine is used to apply conformal coating to the circuit board held by the circuit board clamping fixture.

[0027] A curing oven is used to cure circuit boards that have been coated with conformal coating by a coating machine.

[0028] A flipping mechanism is used to clamp and flip a circuit board clamping fixture that holds a circuit board with one side of its surface coated with conformal coating.

[0029] The conveying mechanism is used to sequentially transfer the circuit board clamping fixture through the coating machine, curing oven, flipping mechanism, coating machine, and curing oven.

[0030] By adopting the above technical solution, the conveying mechanism sequentially passes the circuit board clamping fixture holding the circuit board through the coating machine, curing oven, flipping mechanism, coating machine, and curing oven to achieve the coating of conformal coating on both sides of the circuit board.

[0031] Optionally, the flipping mechanism includes a flipping bracket, a flipping frame rotatably connected to the flipping bracket, and four transmission chain groups disposed on the flipping frame. The four transmission chain groups are divided into two groups, and the two transmission chain groups in the same group are distributed along the direction perpendicular to the transmission direction of the conveying mechanism and the distribution path of the two groups of transmission chain groups. Each transmission chain group includes multiple transmission sprockets and transmission chains sleeved on the multiple transmission sprockets. The opposite side edges of the two transmission chains in the same group are parallel to each other and are used to clamp the circuit board fixture. The flipping frame is provided with a flipping drive component for driving the transmission chains to rotate, and the flipping bracket is provided with a rotating component for driving the flipping frame to rotate.

[0032] By adopting the above technical solution, when the conformal coating is completed on one side of the circuit board, the conveying mechanism sends the fixture frame of the circuit board clamping fixture between the two conveying chains and clamps the fixture frame. Then, the rotating component controls the flipping frame to rotate 180°, so that the side of the circuit board that is not coated with conformal coating changes its orientation, so as to facilitate the coating of conformal coating. Then, the flipping drive component causes the conveying chain to rotate and sends out the circuit board clamping fixture for the coating of conformal coating.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] When applying conformal coating to a circuit board, simply place the board in the fixing area, ensuring the side edge of the board overlaps the inner wall of the clamping groove. Then, rotate the rocker arm to press the side edge of the board into the clamping groove. Finally, fix the rocker arm to the side edge of the fixing area using the fixing components to complete the board fixation. Compared to fixing the board with multiple screws, using the rocker arm method effectively simplifies the board fixation process, thereby improving the efficiency of board fixation. Furthermore, the area of ​​the fixing area can be adjusted by sliding the limit block and the cantilever to accommodate circuit boards of different sizes, thus optimizing the board fixation efficiency while reducing the frequency of changing the board clamping fixture due to changes in board specifications. Attached Figure Description

[0035] Figure 1 This is a structural schematic diagram from a first perspective of Embodiment 1 of this application.

[0036] Figure 2 yes Figure 1 A magnified structural diagram of part A in the middle.

[0037] Figure 3 This is a second-view structural schematic diagram of Embodiment 1 of this application.

[0038] Figure 4 yes Figure 3 A magnified structural diagram of part B.

[0039] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this application.

[0040] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure of the CC line.

[0041] Figure 7 yes Figure 6 A magnified structural diagram of part D in the middle.

[0042] Figure 8 This is a schematic diagram of the circuit board coating and curing production line in the embodiments of this application.

[0043] Figure 9 This is an exploded structural diagram of the flipping mechanism in the circuit board coating and curing production line according to an embodiment of this application.

[0044] Explanation of reference numerals in the attached drawings: 1. Fixture frame; 11. Fixing area; 111. Clamping groove; 112. Limiting protrusion; 12. Limiting component; 121. Limiting block; 122. Limiting bolt; 123. Limiting seat; 13. Locking port; 131. Locking strip; 14. Limiting opening; 15. Fastening cavity; 151. Fastening hole; 16. Extension opening; 2. Rocker arm; 21. Limiting opening; 22. Pulling block; 23. Limiting hole; 3. Fixing assembly; 31. Magnetic suction component; 4. Cantilever; 41. Locking component; 411. Locking block; 412. Locking bolt; 42. Cantilever body; 43. Cantilever connecting block; 5. Fastening assembly; 51. Fastening pin; 511. Fastening pin; 512. Fastening spring; 52. Fastening tube; 52. Airbag; 520. Fastening rod; 521. Fastening strip; 522. Extrusion section; 523. Extrusion tube; 524. Connecting column; 53. Extrusion component; 531. Extrusion plate; 532. Extrusion column; 533. Pad; 54. Fastening plate; 541. Fastening rod; 61. Coating machine; 62. Curing oven; 63. Conveying mechanism; 7. Tilting mechanism; 71. Tilting bracket; 72. Tilting frame; 721. Tilting mounting plate; 73. Transmission chain assembly; 731. Transmission sprocket; 732. Transmission chain; 74. Tilting drive component; 75. Rotating component; 76. Screw assembly; 761. Screw drive motor. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0046] This application discloses a circuit board clamping fixture.

[0047] Example 1

[0048] Reference Figure 1The circuit board clamping fixture includes a fixture frame 1, which has a rectangular frame structure. The fixture frame 1 is slidably provided with two cantilever arms 4. The two cantilever arms 4 are parallel to each other, and the sliding direction of the cantilever arms 4 is perpendicular to the length direction of the cantilever arms 4, forming two fixed areas 11 with adjustable area within the fixture frame 1.

[0049] The jig frame 1 has four rocker arms 2 rotatably connected to the frame edge of the fixed area 11 and the cantilever 4. Two of the rocker arms 2 are rotatably connected to the cantilever 4, and the other two are rotatably connected to the two frame edges of the jig frame 1 parallel to the cantilever. Clamping grooves 111 are provided on the frame edge of the jig frame 1 connected to the rocker arms 2 and the side edge of the cantilever 4 corresponding to the fixed area 11. These grooves are used to place and clamp the outer edge of the electrical boundary of the circuit board, facilitating the application of conformal coating to the circuit board. Specifically, two clamping grooves 111 are provided for the same fixed area 11, and these two clamping grooves 111 are located on opposite sides of the fixed area 11. That is, the two clamping grooves 111 corresponding to the same fixed area 11 are located on the corresponding frame edge of the jig frame 1 and the cantilever 4.

[0050] Reference Figure 1 Fixture frame 1 is provided with a fixing component 3 for adsorbing and fixing rocker arm 2 at the edge of rocker arm 2 and at the part of cantilever 4 corresponding to rocker arm 2.

[0051] The fixing component 3 includes several magnetic attractors 31 fixedly connected to the side edge of the fixing area 11. Specifically, the magnetic attractors 31 are fixedly connected to the frame edge or cantilever 4 of the corresponding rocker arm 2 of the fixture frame 1, and the magnetic attractors 31 are distributed along the length direction of the cantilever 4. Among them, the magnetic attractors 31 are permanent magnets or electromagnets, and the rocker arm 2 is made of magnetic materials, such as magnetized steel, nickel-based alloys, etc.

[0052] When clamping the circuit board, simply place the side edge of the circuit board in the clamping groove 111, then rotate the rocker arm 2 to press the side edge of the circuit board into the clamping groove 111. At the same time, the rocker arm 2 is attracted by multiple magnetic components 31 and attached to the edge of the cantilever 4 or the jig frame 1, thereby fixing the circuit board in the jig frame 1. Compared with using multiple screws to fix the circuit board through the mounting holes, each circuit board does not need to be fixed with screws, which makes it more convenient to clamp the circuit board and optimizes the circuit board fixing efficiency during the coating of conformal coating.

[0053] Of course, in other embodiments, the fixing component 3 may also be a fixing pin that is inserted into and slidably connected to the edge of the fixing area 11 and a fixing spring for pushing the fixing pin into the rocker arm 2, wherein the rocker arm 2 has a fixing hole for the fixing pin to be inserted.

[0054] Reference Figure 1To limit the rotation angle of the rocker arm 2 and reduce the possibility of the circuit board failing to be clamped due to excessive rotation of the rocker arm 2, a limiting protrusion 112 is fixedly connected to the side edge of the fixing area 11. Specifically, each limiting protrusion 112 corresponds to one rocker arm 2 and is fixedly connected to the frame edge or cantilever 4 of the fixture frame 1 where the rocker arm 2 is connected. The end of the rocker arm 2 away from the rotation axis has a limiting opening 21 for cooperating with the limiting protrusion 112, and the limiting protrusion 112 is located on the swing path of the limiting opening 21 as the rocker arm 2 swings. A lever 22 is fixedly connected to the end of the rocker arm 2 away from its own rotation axis to facilitate the rotation of the rocker arm 2.

[0055] When in use, after the side edge of the circuit board is placed in the clamping groove 111, the rocker arm 2 is rotated so that the rocker arm 2 closes in the clamping groove 111. During this process, the limiting protrusion 112 abuts against the inner edge of the limiting opening 21, thereby limiting the rocker arm 2.

[0056] Reference Figure 1 and Figure 2 Specifically, the two ends of the cantilever 4 are respectively provided with locking members 41 for sliding and locking the cantilever 4. The frame of the fixture frame 1 is provided with locking openings 13 on the frame edges corresponding to the two ends of the cantilever 4. The outline of the locking opening 13 is long and extends along the length direction of the frame edge of the fixture frame 1.

[0057] The locking component 41 includes a locking block 411 and a locking bolt 412 that passes through and is threaded to the locking block 411. The locking block 411 is engaged with and slidably connected to the inner wall of the locking port 13.

[0058] Reference Figure 1 and Figure 2 The locking block 411 has a T-shaped block structure, and locking strips 131 are fixedly connected to the two inner walls of the locking opening 13 parallel to the length direction. The small end of the locking block 411 is located between the two locking strips 131. The screw of the locking bolt 412 passes through and is threaded to the small end of the locking block 411, and the screw part of the locking bolt 412 passes through the end of the cantilever 4. The end of the cantilever 4 is clamped between the locking block 411 and the screw head of the locking bolt 412, and the frame edge of the fixture frame 1 is clamped between the locking block 411 and the cantilever 4.

[0059] When the area of ​​the fixed area 11 needs to be adjusted to accommodate circuit boards of different specifications, simply slide the locking block 411 along the length of the locking opening 13, then rotate the locking bolt 412 so that the locking block 411 abuts against the locking strip 131, and finally press the end of the cantilever 4 against the frame edge of the fixture frame 1 to achieve the sliding locking of the cantilever 4. This can also accommodate circuit boards of different sizes, thereby improving the efficiency of conformal coating for circuit boards of different specifications.

[0060] Of course, in other embodiments, the locking member 41 can also be a permanent suction disk fixedly connected to the end of the cantilever 4, the permanent suction disk being engaged and slidably connected within the locking port 13, and the frame edge of the fixture frame 1 being made of magnetic material. When the cantilever 4 needs to slide and lock, it is only necessary to control the permanent suction disk to adhere to the fixture frame 1.

[0061] Reference Figure 1 and Figure 2 The cantilever 4 includes a cantilever body 42 and two cantilever connecting blocks 43. The cantilever body 42 is located inside the fixture frame 1, and the end of the cantilever body 42 is attached to the inner edge of the fixture frame 1. One end of the cantilever connecting block 43 is fixedly connected to the cantilever body 42 so that the cantilever body 42 is flush with the fixture frame 1, reducing the space occupied.

[0062] The cantilever connecting block 43 is fixedly connected to the cantilever body 42 by multiple bolts. Of course, in other embodiments, the cantilever connecting block 43 may also be integrally formed on the cantilever body 42 or welded to the cantilever body 42. The locking bolt 412 passes through the cantilever connecting block 43 to fix the locking block 411 to the cantilever body 42.

[0063] Reference Figure 3 and Figure 4 Furthermore, since the circuit board edges are clamped by the rocker arm 2 in conjunction with the cantilever 4 and the frame of the fixture frame 1, the coating machine often uses visual recognition to identify the position of the circuit board when applying conformal coating. For example, a CCD vision recognition system identifies the position of the circuit board before applying conformal coating. If different circuit boards are installed in different positions, the coating end of the coating machine will need a relatively long time to adjust after the circuit board is identified. Therefore, a limiting member 12 is provided in the fixture frame 1 to fix the position of the circuit board and reduce the time required for the coating end of the coating machine to adjust the position after the circuit board is identified.

[0064] Reference Figure 3 and Figure 4 The fixture frame 1 has a limiting opening 14 perpendicular to the frame edge of the cantilever 4. The limiting opening 14 has an elongated profile and extends along the length of the cantilever 4. The inner wall of the limiting opening 14 has a T-shaped profile along its cross-section perpendicular to the length direction. The limiting member 12 includes a limiting block 121 and a limiting bolt 122. A limiting seat 123 is provided inside the limiting opening 14. The limiting seat 123 has a T-shaped block structure and passes through the limiting opening 14. The large end of the limiting seat 123 abuts against the transition surface of the inner wall of the limiting opening 14, so that the limiting block 121 is slidably connected to the fixture frame 1.

[0065] Reference Figure 3 and Figure 4The limiting block 121 is attached to the outer wall of the fixture frame 1 on the side opposite to the limiting seat 123, and the limiting bolt 122 passes through the limiting block 121, the limiting port 14, and the limiting seat 123, and is threaded to the limiting seat 123, so as to press the limiting block 121 against the frame edge of the fixture frame 1. Both the limiting bolt 122 and the locking bolt 412 are wing bolts. The end of the limiting block 121 facing the fixing area 11 protrudes towards the inner side of the fixture frame 1 to abut against the edge of the circuit board.

[0066] When mass-producing circuit boards of fixed specifications, simply place the circuit board in the clamping groove 111, then slide the limiting block 121 and the cantilever 4 to the corresponding position, so that the formed fixing area 11 adapts to the specifications and dimensions of the circuit board. Then rotate the limiting bolt 122 and the locking bolt 412, so that the cantilever 4 and the limiting block 121 slide and lock relative to the fixture frame 1, so that the area of ​​the fixing area 11 can be adapted to the circuit board of the corresponding specifications. Thus, in the subsequent process of coating the circuit board with conformal coating, only the rocker arm 2 needs to be rotated to fix the circuit board, instead of screwing one by one through the circuit board and threaded to the fixture frame 1, thereby improving the coating efficiency of the circuit board with conformal coating.

[0067] Of course, in other embodiments, the limiting member 12 can also be configured as a permanent magnet chuck that is slidably connected to the fixture frame 1 parallel to the length direction of the cantilever 4, and the fixture frame 1 is made of magnetic material. After sliding to the corresponding position, the limiting member 12 can be attracted and fixed to the fixture frame 1; or the limiting bolt 122 is threaded through and connected to the limiting block 121, and the limiting block 121 is engaged and slidably connected to the opening edge of the limiting port 14. The limiting bolt 122 abuts against the frame edge of the fixture frame 1 to lock the sliding of the limiting block 121.

[0068] Example 2

[0069] Reference Figure 5 and Figure 6 The difference between this embodiment and embodiment 1 is that the fixture frame 1 is provided with a fastening component 5 perpendicular to the frame edge of the cantilever 4, which is used to lock the end of the rocker arm 2 by rotation.

[0070] During the conformal coating process, since conformal coating needs to be applied to both sides of the circuit board, after one side of the circuit board is coated with conformal coating, the fixture frame 1 needs to be flipped over before the other side of the circuit board is coated. During this process, it was found that the rocker arm 2 may swing or shift during the flipping of the fixture frame 1. At this time, the rocker arm 2 is limited by the fastening component 5, which can effectively reduce the possibility of the circuit board becoming loose due to the rotation of the rocker arm 2 or the possibility of defects in the conformal coating caused by the interference of the rocker arm 2.

[0071] Reference Figure 6 and Figure 7 Specifically, the fastening assembly 5 includes two fastening pins 51, an airbag 52 for pushing the fastening pins 51 into the end of the rocker arm 2, and an extrusion member 53 for squeezing the airbag 52 in the thickness direction of the fixture frame 1. The fixture frame 1 has a fastening cavity 15 formed on the inner side of the frame edge corresponding to the swing end of the rocker arm 2. The fastening cavity 15 has a plurality of fastening holes 151 extending toward the rocker arm 2. The central axis of the fastening holes 151 is parallel to the length direction of the cantilever 4.

[0072] Reference Figure 6 and Figure 7 The fastening pin 51 slides along the length of the cantilever 4 and is connected to the fixture frame 1. Specifically, the fastening pin 51 passes through and slides to the cantilever connecting block 43, so that the fastening pin 51 is slidably connected to the fixture frame 1 through the cantilever connecting block 43; or the fastening pin 51 is connected to the fixture frame 1 through the outer fastening tube 512 (see reference). Figure 5 The cantilever connecting block 43 is slidably connected to the frame edge of the fixture frame 1, and the fastening tube 512 is fixedly connected to the frame edge of the rocker arm corresponding to the fixture frame 1. A fastening spring 511 is provided inside the cantilever connecting block 43 to disengage the fastening pin 51 from the rocker arm 2. The fastening spring 511 is sleeved on the fastening pin 51, and the two ends of the fastening spring 511 are fixedly connected to the cantilever connecting block 43 and the fastening pin 51, respectively.

[0073] Reference Figure 6 and Figure 7 The airbag 52 is integrally embedded inside the fastening cavity 15. The airbag 52 includes a compression part 522 integrally embedded in the fastening cavity 15 and several compression tubes 523 communicating inside the airbag 52. Both the compression part 522 and the compression tubes 523 are made of elastic material and have a hollow structure, such as rubber or silicone. The compression tubes 523 are embedded in the fastening hole 151, and one end of the compression tube 523 located in the fastening hole 151 is fixedly connected to a connecting post 524 to limit the compression tube 523 from extending out of the fastening hole 151.

[0074] The jig frame 1 has multiple extension openings 16 corresponding to the positions of multiple fastening holes 151. The extension openings 16 are elongated and connected to the fastening holes 151, and their extension direction is parallel to the cantilever 4. A fastening strip 521 is slidably connected to the frame edge of the jig frame 1 corresponding to the swing end of the rocker arm 2. Several fastening rods 520 passing through the extension openings 16 are fixedly connected to the fastening strip 521, and the fastening rods 520 are fixedly connected to the connecting post 524. The sliding path of the fastening strip 521 is parallel to the sliding path of the fastening pin 51, so that when the fastening strip 521 slides, it can push the fastening pin 51 towards the rocker arm 2. The swing end of the rocker arm 2 has a limiting hole 23 corresponding to the fastening pin 51. When the limiting hole 23 abuts against the limiting protrusion 112, the limiting hole 23 is located on the axial sliding path of the fastening pin 51.

[0075] During use, the area of ​​the fixing area 11 needs to be adjusted according to the specifications of the circuit board. At this time, the extruder 53 is not under force or only one side is under force, and the fastening pin 51 is in a retracted state. Therefore, when adjusting the area of ​​the fixing area 11, or when the circuit board needs to be removed or placed in the fixing area 11, the fastening pin 51 disengages from the limiting hole 23, allowing the rocker arm 2 to swing, thereby reducing interference with the adjustment of the area of ​​the fixing area 11, the placement of the circuit board, and the removal of the circuit board. When flipping the fixture frame 1 to adjust the coated board surface, the fixture frame 1 needs to be clamped. At this time, the extruder 53... The fixture frame 1 will be subjected to a pressing force along the thickness direction towards the center. At this time, the pressing part 522 will be pressed, causing the pressing tube 523 to expand and drive the connecting column 524 to slide axially. During this process, the fastening rod 520 drives the fastening strip 521 to abut and push the fastening pin 51 towards the rocker arm 2, thereby inserting the fastening pin 51 into the rocker arm 2 to reduce the possibility of the rocker arm 2 swinging during the flipping process. This optimizes the stability of the flipping process during the coating of conformal coating, while reducing the impact on the placement, removal and area adjustment of the fixed area 11 of the circuit board.

[0076] Reference Figure 6 and Figure 7 Specifically, the extrusion component 53 includes two extrusion plates 531, a plurality of extrusion pillars 532 fixedly connected to the opposing side surfaces of the two extrusion plates 531, and a pad 533 fixedly connected to one end of the extrusion pillar 532 away from the connected extrusion plate 531. The two pads 533 are disposed within the fastening cavity 15, and the extrusion part 522 is clamped between the two pads 533, such that the extrusion pillars 532 abut against the extrusion part 522 through the pads 533. One end of the extrusion pillar 532 away from the connected pad 533 protrudes through the cavity wall of the fastening cavity 15. The frame edge of the fixture frame 1 corresponding to the swing end of the rocker arm 2 is clamped between the two extrusion plates 531, and a gap is provided between the extrusion plates 531 and the fixture frame 1, so that the extrusion plates 531 can slide relative to the fixture frame 1.

[0077] Of course, in other embodiments, the pressing member 53 includes a fastening pin 51 slidably disposed at the end of the rocker arm 2 and a permanent magnet chuck fixedly connected in the cantilever connecting block 43. The control end of the permanent magnet chuck is slidably connected to the edge of the jig frame 1 that is being pressed by a spring. The fastening pin 51 is made of magnetic material. When the jig frame 1 is clamped, the permanent magnet chuck will attract the fastening pin 51 and insert it into the cantilever connecting block 43, thereby achieving the effect of restricting the rotation of the rocker arm 2.

[0078] The implementation principle of Example 2 is as follows: When the fixture frame 1 is clamped, the two extrusion plates 531 slide toward the fixture frame 1, and the extrusion column 532 pushes the pad 533 to extrude the extrusion part 522. Since the area of ​​the extrusion part 522 being extruded is relatively large and is restricted by the fastening cavity 15, even when the extrusion part 522 is extruded to a limited extent, the extension and retraction range of the extrusion tube 523 can still be relatively large. Thus, the fastening plate 54 is pushed toward the fastening pin 51 by the connecting column 524 and the fastening rod 541, thereby inserting the fastening pin 51 into the limiting hole 23 and locking the swing of the rocker arm 2.

[0079] This application also discloses a circuit board coating and curing production line. (Refer to...) Figure 8 and Figure 9 The circuit board coating and curing production line includes a flipping mechanism 7, two coating machines 61, two curing ovens 62, and several conveying mechanisms 63.

[0080] The coating machine 61 is used to apply conformal coating to the surface of the circuit board held by the circuit board clamping fixture; the curing oven 62 is used to cure the circuit board coated with conformal coating by the coating machine 61, and the curing oven 62 is an infrared curing oven; the flipping mechanism 7 is used to clamp and flip the circuit board clamping fixture that holds the circuit board; the conveying mechanism 63 is used to sequentially transfer the circuit board clamping fixture through the coating machine 61, the curing oven 62, the flipping mechanism 7, the coating machine 61, and the curing oven 62. The distribution path of the multiple conveying mechanisms 63, the coating machine 61, the curing oven 62, the flipping mechanism 7, the coating machine 61, and the curing oven 62 is U-shaped or arc-shaped. In this embodiment, the distribution path is U-shaped, that is, the conveying mechanism 63 located at the input end of the coating machine 61, which is transferred first by the circuit board clamping fixture, is set to correspond to the conveying mechanism 63 located at the output end of the curing oven 62, which is transferred later by the circuit board clamping fixture, so that during production, only one person is needed to complete the loading and unloading of the circuit board coating and curing production line, thereby achieving the effect of saving manpower. In this embodiment, the conveying mechanism 63 is a chain conveyor, and the two opposing chain plates of the conveying mechanism 63 are fixedly connected with fixing pins for placing the circuit board clamping fixture, so as to maintain the angle of the circuit board clamping fixture while conveying it. Of course, in other embodiments, the conveying mechanism 63 can also be a conveyor belt.

[0081] When applying conformal coating to the circuit board, the circuit board clamping fixture is placed inside the two chains of the conveying mechanism 63. Then, the circuit board passes through the coating machine 61 to complete the conformal coating on one side of the board. After curing in the curing oven 62, the conformal coating on the circuit board is cured. Then, the circuit board is flipped by the flipping mechanism 7 so that the uncoated side of the circuit board held by the circuit board clamping fixture faces upward. Then, the circuit board flows into the coating machine 61 to apply conformal coating to the remaining side of the board. Finally, after curing in the curing oven 62, the conformal coating on both sides of the circuit board is completed.

[0082] Reference Figure 8 and Figure 9 Specifically, the flipping mechanism 7 includes a flipping bracket 71, a flipping frame 72 rotatably connected to the flipping bracket 71, and four transmission chain groups 73 disposed on the flipping frame 72. The flipping bracket 71 has a box-shaped or steel truss-shaped structure. In this embodiment, the flipping bracket 71 has a box-shaped structure and is provided with a horizontally open inlet end and outlet end. The rotation axis of the flipping frame 72 is in the same plane as the distribution paths of the inlet end and outlet end of the flipping bracket 71. The rotation axis of the flipping frame 72 is horizontally arranged and is in the same plane as the distribution paths of the two chains of the conveying mechanism 63, so that the circuit board clamping fixture transmitted by the conveying mechanism 63 can be passed into the flipping bracket 71.

[0083] Reference Figure 8 and Figure 9 The flipping frame 72 is rotatably connected to the flipping bracket 71 via a rotating component 75, which drives the flipping frame 72 to flip, adjusting the angle of the circuit board clamping fixture held by the transmission chain assembly 73, thereby completing the flipping of the circuit board clamping fixture. The rotating component 75 is a drive motor or an electric turntable; in this embodiment, the rotating component 75 is an electric turntable, and it is fixedly connected to the flipping bracket 71, with its rotating end fixedly connected to the flipping frame 72.

[0084] A tilting frame 72 is slidably mounted with a tilting mounting plate 721. Specifically, rods of the tilting frame 72, parallel to the distribution direction of the two sets of transmission chain groups 73, pass through the tilting mounting plate 721. The tilting mounting plate 721 is vertically arranged and is equipped with a lead screw assembly 76. The lead screw of the lead screw assembly 76 passes through the tilting mounting plate 721, and the nut of the lead screw assembly 76 is fixedly connected to the tilting mounting plate 721. A lead screw drive motor 761 is fixedly connected to the tilting frame 72 to drive the lead screw of the lead screw assembly 76 to rotate. The output shaft of the lead screw drive motor 761 is coaxially fixedly connected to the lead screw of the lead screw assembly 76.

[0085] Reference Figure 8 and Figure 9The four transmission chain groups 73 are divided into two groups, and the two groups of transmission chain groups 73 are distributed along the rotation axis of the tilting frame 72. Each group contains two transmission chain groups 73. One group of transmission chain groups 73 is set on the tilting frame 72 through the tilting mounting plate 721, and the other group of transmission chain groups 73 is set on the tilting frame 72. The two transmission chain groups 73 in the same group are vertically distributed.

[0086] The transmission chain assembly 73 includes multiple transmission sprockets 731 and transmission chains 732 that are sleeved on and mesh with the multiple transmission sprockets 731. The side edges of the transmission chains 732 of two transmission chain assemblies 73 in the same assembly are parallel to each other to clamp the frame edges of the fixture frame 1 located at both ends of the rocker arm 2. The transmission sprockets 731 of one set of transmission chain assemblies 73 are rotatably connected to the flipping frame 72, and the transmission sprockets 731 of the other set of transmission chain assemblies 73 are rotatably connected to the flipping frame 72 via a flipping mounting plate 721. That is, the transmission sprockets 731 of the transmission chain assembly 73 on the flipping mounting plate 721 are rotatably connected to the flipping mounting plate 721.

[0087] Reference Figure 8 and Figure 9 One of the transmission sprockets 731 of the transmission chain group 73 is fixedly connected to a flip drive 74. The flip drive 74 is a motor, and the output shaft of the flip drive 74 is coaxially fixedly connected to the corresponding transmission sprocket 731. The flip drive 74 is fixedly connected to the flip frame 72 or connected to the flip frame 72 through the flip mounting plate 721.

[0088] Of course, in other embodiments, the flipping frame 72 of the flipping mechanism 7 is a cylindrical frame structure, and the axial direction of the flipping frame 72 is parallel to the distribution direction of the feed end and the discharge end of the flipping bracket 71. The two ends of the flipping frame 72 are rotatably connected to the flipping bracket 71 through bearings. A toothed ring is fixedly connected to one end of the axial direction of the flipping frame 72. The rotating component 75 is a motor and the output shaft is fixedly connected to a drive gear meshing with the toothed ring. The transmission chain group 73 is located inside the flipping frame 72.

[0089] The implementation principle of this application embodiment is as follows: when coating the circuit board with conformal coating, the circuit board clamping fixture is transferred by the conveying mechanism 63, and then the circuit board clamping fixture completes the conformal coating on one side of the board by the coating machine 61, and then is cured by the curing oven 62, so that the conformal coating on one side of the circuit board is cured. Then, the circuit board clamping fixture is fed into the flipping bracket 71 via the conveying mechanism 63, and the fixture frame 1 is clamped between the two conveying chains 732 of the two conveying chain groups 73 in the same group. Then, the rotating component 75 drives the flipping frame 72 to rotate 180°, so that the other side of the circuit board clamped by the circuit board clamping fixture faces upward. After flipping, the flipping drive component 74 drives the conveying sprocket 731 to rotate, and outputs the circuit board fixture frame to the conveying mechanism 63. After being sent to the next coating machine 61 by the conveying mechanism 63, the three-proof paint is applied to the remaining side of the circuit board. Finally, after curing in the curing oven 62, the three-proof paint application on both sides of the circuit board is completed. In addition, according to the circuit board clamping fixtures of different specifications and sizes, the sliding of the flipping mounting plate 721 can be controlled by the lead screw assembly 76 to adjust the distance between the two conveying chain groups 73, thereby adapting to the circuit board clamping fixtures of different specifications and sizes.

[0090] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A circuit board clamping fixture, characterized in that: The fixture includes a jig frame (1), which has at least one fixed area (11) with an adjustable area. The fixed area (11) is used to mount a circuit board. At least two sides of the fixed area (11) are respectively provided with rocker arms (2). A clamping groove (111) for clamping the edge of the circuit board is formed between the rocker arm (2) and the side edge of the fixed area (11). The side edge of the fixed area (11) is provided with a fixing component (3) for adsorbing and fixing the rocker arm (2). The fixture frame (1) is provided with a fastening assembly (5) for limiting the swing end of the rocker arm (2). The fastening assembly (5) includes several fastening pins (51), an airbag (52) for pushing the fastening pins (51) into the end of the rocker arm (2), and a squeezing member (53) for squeezing the airbag (52) on both sides in the thickness direction of the fixture frame (1). The fastening pins (51) are slidably connected to the cantilever (4). The airbag (52) is embedded in the interior of the fixture frame (1), and the telescopic end of the airbag (52) is connected to a fastening strip (521). The fastening pins (51) are located on the telescopic path of the fastening strip (521). The squeezing member (53) is provided on the fixture frame (1). The extrusion member (53) includes two extrusion plates (531), the frame edge of the fixture frame (1) is clamped between the two extrusion plates (531), the extrusion plates (531) are fixedly connected to an extrusion column (532) perpendicular to the extrusion plates (531), the extrusion column (532) is inserted and slidably connected to the fixture frame (1), and the extrusion column (532) abuts against the airbag (52).

2. The circuit board clamping fixture according to claim 1, characterized in that: The fixing component (3) includes several magnetic suction components (31) fixedly connected to the side edge of the fixing area (11), and the rocker arm (2) is made of magnetic material.

3. The circuit board clamping fixture according to claim 2, characterized in that: The side edge of the fixed area (11) is fixedly connected to a limiting protrusion (112), and the rocker arm (2) is provided with a limiting port (21) that cooperates with the limiting protrusion (112). The limiting protrusion (112) is located on the swing path of the limiting port (21) as the rocker arm (2) swings.

4. The circuit board clamping fixture according to claim 1, characterized in that: The fixture frame (1) is slidably provided with a cantilever (4), the sliding direction of the cantilever (4) is perpendicular to the length direction of the cantilever (4), the fixed area (11) is formed between the cantilever (4) and the frame edge of the fixture frame (1), the rocker arm (2) is rotatably provided on the frame edge of the cantilever (4) or the fixture frame (1), and the cantilever (4) or the fixture frame (1) is provided with a locking member (41) that locks the cantilever (4) in the sliding.

5. The circuit board clamping fixture according to claim 4, characterized in that: The locking component (41) includes a locking block (411) and a locking bolt (412) threaded to the locking block (411). The locking block (411) is slidably connected to the frame edge of the fixture frame (1) in a direction perpendicular to the length of the cantilever (4). The locking bolt (412) passes through the cantilever (4) and the locking block (411), and the frame edge of the fixture frame (1) is clamped between the locking block (411) and the cantilever (4).

6. The circuit board clamping fixture according to claim 1, characterized in that: The edge of the fixed area (11) is provided with a limiting member (12). The limiting member (12) includes a limiting block (121) that is slidably connected to the side edge of the fixed area (11) and a limiting bolt (122) for fastening the limiting block (121) to the side edge of the fixed area (11). The limiting bolt (122) passes through the limiting block (121) and the side edge of the fixed area (11).

7. A circuit board coating and curing production line, characterized in that: include: A coating machine (61) is used to apply conformal coating to a circuit board held by a circuit board clamping fixture as described in any one of claims 1-6; Curing oven (62) is used to cure the circuit board coated with conformal coating by the coating machine (61); The flipping mechanism (7) is used to clamp and flip the circuit board clamping fixture on which the circuit board with one side of the board surface coated with conformal coating is placed. The conveying mechanism (63) is used to sequentially transfer the circuit board clamping fixture through the coating machine (61), the curing oven (62), the flipping mechanism (7), the coating machine (61), and the curing oven (62).

8. The circuit board coating and curing production line according to claim 7, characterized in that: The flipping mechanism (7) includes a flipping bracket (71), a flipping frame (72) rotatably connected to the flipping bracket (71), and four transmission chain groups (73) arranged on the flipping frame (72). The four transmission chain groups (73) are divided into two groups, and the two transmission chain groups (73) in the same group are distributed along the direction perpendicular to the transmission direction of the conveying mechanism (63) and the distribution path of the two groups of transmission chain groups (73). The transmission chain group (73) includes multiple transmission sprockets (731) and transmission chains (732) sleeved on the multiple transmission sprockets (731). The two sides of the two transmission chains (732) in the same group are parallel to each other and are used to clamp the circuit board fixture. The flipping frame (72) is provided with a flipping drive member (74) for driving the transmission chain (732) to rotate. The flipping bracket (71) is provided with a rotating member (75) for driving the flipping frame (72) to rotate.

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