Circuit board production clamp lock structure

Abstract

The application provides a circuit board production clamp lock structure and relates to the technical field of wave soldering clamps. The circuit board production clamp lock structure comprises a lower frame and an upper frame. A placing groove for placing a circuit board is formed in the lower frame. Slide rail grooves are formed in both sides of the top end of the lower frame. When the upper frame is turned over to shield in the initial position, the spring positioning contact is located above the upper frame. The bottom surface of the upper frame is in flexible contact with the top end plane of the circuit board. Not only is dust prevented, but the PCB is also horizontally positioned and flatly supported. The upper frame can be positioned and locked on the lower frame through a bidirectional lock structure. When the components on the circuit board need to be pressed, the upper frame is turned over by 180 degrees so that the contact points face downward. Then, the limiting frame is released from the limiting position. The limiting frame is pushed to move to the other end of the lower frame. The components on the circuit board can be precisely extruded through the spring positioning contact. The structure realizes the functions of plane turning positioning and contact point pressing and avoids damage caused by mispressing in the shielding state.

Description

Technical Field

[0001] This invention relates to the field of wave soldering fixture technology, and in particular to a locking structure for a circuit board production fixture. Background Technology

[0002] Wave soldering is a key process in electronics manufacturing used for the mass soldering of through-hole components. Reliable solder joints are formed by the contact between the molten solder wave and the circuit board pads. Because the circuit board must withstand high temperatures and undergo flux spraying, preheating, and the impact of the solder wave during soldering, direct transfer can easily lead to board deformation, component displacement, or damage to heat-sensitive devices. Therefore, a fixture is needed to protect the circuit board. This fixture is specifically designed for wave soldering and uses a carrier frame made of high-temperature resistant synthetic stone or titanium alloy. Precision positioning pins engage with the process holes on the circuit board for accurate positioning. Locking devices are distributed around the frame, employing a quick-press or screw-tightening structure to firmly hold the circuit board within the carrier within seconds. This prevents solder warping and shields already mounted sensitive components from contact with the solder. The fixture's bottom is hollowed out to ensure full wetting of the solder joints, and a protective strip on the top prevents excess solder from splashing.

[0003] In use, the operator places the circuit board in the fixture groove, fastens the upper frame, and then fastens the four locking buckles to complete the clamping. The entire fixture is then placed into the wave soldering conveyor for soldering. This structure significantly improves soldering consistency and yield, while also supporting quick line changes, making it suitable for efficient production of multiple varieties of small and medium batches of circuit boards.

[0004] The existing upper frame locking structure of wave soldering fixtures is usually a fixed design. The upper frame can only lock with the lower frame in one orientation (spring positioning contact facing down), which can only achieve the function of pressing and fixing the circuit board. When the production process only requires flat shielding of the circuit board to prevent dust, protecting high-surface components from contact pressure, or buffering between processes, the existing upper frame with contacts cannot meet the requirements and must be replaced with a flat upper frame. This single-function design means that manufacturers need to equip the same lower frame with multiple upper frames, which not only causes the fixture management to be chaotic and the risk of mismatch is high, but also the frequent replacement of upper frames seriously affects the continuity of production and increases equipment investment costs. Summary of the Invention

[0005] To address the technical problem that existing fixture frames cannot be used on both sides, this invention provides a circuit board manufacturing fixture locking structure.

[0006] The technical solutions provided by the embodiments of the present invention are as follows: The present invention provides a circuit board production fixture locking structure, including a lower frame and an upper frame. The lower frame has a placement groove for placing circuit boards. The top two sides of the lower frame are provided with slide rail grooves. The slide rail grooves are provided with limiting mechanisms for limiting the upper frame. A two-way locking structure is provided between the upper frame and the lower frame. The limiting mechanism includes a limiting frame, a flipping frame, and a flipping hinge. A pair of limiting frames are provided, and each limiting frame is laterally slidably connected to the inner side of a corresponding slide rail groove. The flipping frame is located between the top ends of the limiting frames. A pop-up mechanism is also provided for popping up the flipping frame and the upper frame after unlocking. A pair of flipping hinges are provided, and each flipping hinge is fixedly connected to the top end of the upper frame. Each flipping hinge is rotatably connected to the inner side of the flipping frame. A positioning mechanism is also provided for limiting the position of the limiting frame. The bidirectional locking structure includes a lower cylinder, an upper cylinder, and locking rods. Several lower cylinders, upper cylinders, and locking rods are provided. Several lower cylinders are equidistantly fixedly connected to the bottom of the lower frame. Several upper cylinders are fixedly connected through the top of the upper frame and are positioned above the lower cylinders. Several locking rods are inserted into the inner side of the upper cylinders.

[0007] Furthermore, each of the four corners of the bottom of the lower frame is fixedly connected with a positioning pin, and each of the four corners of the top of the upper frame is provided with a positioning hole. The top of the positioning pin is set as a smooth arc surface, and the positioning hole is opened directly above the positioning pin.

[0008] Furthermore, positioning cylinders are fixedly connected to the four corners of the top of the upper frame, and several spring positioning contacts for pressing the components on the circuit board are provided at equal intervals at the top of the upper frame.

[0009] Furthermore, the pop-up mechanism includes an upper spring, a lower spring, an upper rod, and a lower rod. The upper rod and the upper spring are each provided in pairs. The upper rod is longitudinally slidably connected to the top of the limiting frame. The upper spring is fixedly connected between the bottom end of the upper rod and the bottom end of the limiting frame. The top end of the upper rod is fixedly connected to the flipping frame.

[0010] Furthermore, there are three lower springs and lower rods. All three lower rods are installed through the top of the tilting frame, and a lower plate is fixedly connected to the bottom of each lower rod. The three lower springs are fixedly connected between the top of the tilting frame and the outer wall of the lower rod.

[0011] Furthermore, the positioning mechanism includes bolts, and a pair of bolts are provided. A pair of through holes are provided on both the front and rear sides of the lower frame, and threaded holes are provided on both the side walls of the limiting frame. The bolt passes through one of the through holes and is threaded into the corresponding threaded hole.

[0012] Furthermore, a pair of top grooves are provided at the top of the upper cylinder, and a top plate is longitudinally slidably connected to the inner side of each top groove. A positioning ring is fixedly connected between the top plates. A circular groove is provided on the outer wall of the locking rod, and the positioning ring is rotatably connected to the inner side of the circular groove. A positioning spring is fixedly connected between the bottom end of the top groove and the bottom end of the top plate.

[0013] Furthermore, a pair of insert rods are fixedly connected to the outer wall of the locking rod, one of which is located at the bottom end of the side wall of the locking rod, and the other insert rod is located at the top end of the other side of the locking rod.

[0014] Furthermore, the length of the locking rod extending from the top of the upper frame is twice the length extending from the bottom of the upper frame, and both the upper and lower sides of the locking rod are set as smooth arc surfaces.

[0015] Furthermore, a vertical groove is provided through the side wall of the lower cylinder, and an L-shaped groove is provided on the side wall of the vertical groove.

[0016] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this invention, when the upper frame is flipped and shielded in its initial position, the spring positioning contact is located above the upper frame, and the bottom surface of the upper frame flexibly contacts the top plane of the circuit board. This not only prevents dust but also provides horizontal positioning and flat support for the PCB. The upper frame can be locked onto the lower frame through a two-way locking structure. When it is necessary to press the components on the circuit board, the upper frame is flipped 180° so that the contact faces downward, and then the limiting frame is released. The limiting frame is then pushed to the other end of the lower frame, and the components on the circuit board can be precisely pressed by the spring positioning contact. This structure achieves the dual functions of planar flipping positioning and contact pressing, avoiding accidental pressure damage in the shielded state. It is particularly suitable for double-sided mixed-assembly boards (where precision components such as BGA are mounted on the A side and require flat support), high component density boards, and flexible circuit boards, effectively improving welding accuracy and product yield.

[0017] Furthermore, this invention employs a two-way locking structure, which allows the spring positioning contact to be locked and fixed to the lower frame using the same locking mechanism, regardless of whether the spring positioning contact is facing up or down. This design enables the upper frame to be used in both modes, eliminating the need for multiple upper frames, simplifying fixture management, avoiding mismatch risks, significantly reducing equipment costs, and improving production line changeover efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This is a top-view perspective view of the circuit board clamp structure of the present invention; Figure 2 This is a schematic diagram of the overall appearance structure of the circuit board clamp after adjustment according to the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the upper and lower frames of the present invention. Figure 4 This is a three-dimensional structural diagram of the upper frame of the present invention viewed from below; Figure 5 This is a schematic diagram of the overall appearance structure of the lower cylinder of the present invention; Figure 6 This is a bottom-view perspective view of the partially separated tilting frame, lower rod, bolts, and limiting frame of the present invention. Figure 7 This is a partial cross-sectional three-dimensional structural diagram of the separation of the limiting frame and bolts of the present invention; Figure 8 This is a schematic diagram of the overall appearance structure of the upper frame of the present invention; Figure 9 This is a three-dimensional structural diagram of the upper cylinder and locking rod side of the present invention; Figure 10 This is a schematic diagram of the three-dimensional structure of the upper cylinder, locking rod, and positioning ring of the present invention. Figure 11 This is a partial cross-sectional three-dimensional structural diagram of the upper cylinder and locking rod of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1. Lower frame; 2. Upper frame; 3. Placement slot; 4. Slide rail slot; 5. Limiting frame; 6. Flip frame; 7. Flip hinge; 8. Lower cylinder; 9. Upper cylinder; 10. Locking rod; 11. Positioning pin; 12. Positioning hole; 13. Positioning cylinder; 14. Spring positioning contact; 15. Upper spring; 16. Lower spring; 17. Upper rod; 18. Lower rod; 19. Lower plate; 20. Bolt; 21. Through hole; 22. Threaded hole; 23. Top groove; 24. Top plate; 25. Positioning ring; 26. Circular groove; 27. Positioning spring; 28. Insert rod; 29. ​​Vertical groove; 30. L-shaped groove.

[0021] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0022] The technical solutions of the present invention will now be described with reference to the accompanying drawings. It should be noted that, in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also use other alternative methods to implement them. Moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0023] In practical use, it was found that the locking structure of the upper frame 2 of the existing wave soldering fixture is usually a fixed design. The upper frame 2 can only lock with the lower frame 1 in a single orientation (spring positioning contact 14 facing down), which can only achieve the function of pressing and fixing the circuit board. When the production process only requires flat shielding of the circuit board to prevent dust, protecting high-surface components from contact pressure, or buffering between processes, the existing upper frame 2 with contacts cannot meet the requirements and must be replaced with a flat upper frame 2. This single-function design leads to the need for manufacturers to equip the same lower frame 1 with multiple upper frames 2, which not only causes the fixture management to be chaotic and the risk of mismatch is high, but also the frequent replacement of upper frame 2 seriously affects the continuity of production and increases equipment investment costs. In order to solve the above problems, the following structure was invented.

[0024] like Figures 1 to 11 As shown, an embodiment of the present invention provides a circuit board production fixture locking structure, including a lower frame 1 and an upper frame 2. The lower frame 1 has a placement groove 3 for placing circuit boards. The top two sides of the lower frame 1 are provided with slide rail grooves 4. The slide rail grooves 4 are provided with limiting mechanisms for limiting the upper frame 2. A two-way locking structure is provided between the upper frame 2 and the lower frame 1. The limiting mechanism includes a limiting frame 5, a flipping frame 6, and a flipping hinge 7. A pair of limiting frames 5 are provided, and each limiting frame 5 is laterally slidably connected to the inner side of the corresponding slide rail groove 4. The flipping frame 6 is located between the tops of the limiting frames 5. A pop-up mechanism is also provided for popping up the flipping frame 6 and the upper frame 2 after unlocking. A pair of flipping hinges 7 are provided, and each flipping hinge 7 is fixedly connected to the top of the upper frame 2. Each flipping hinge 7 is rotatably connected to the inner side of the flipping frame 6. A positioning mechanism is also provided for limiting the position of the limiting frame 5. The two-way locking structure includes a lower cylinder 8, an upper cylinder 9, and a locking rod 10. Several lower cylinders 8, upper cylinders 9, and locking rods 10 are provided. Several lower cylinders 8 are fixedly connected at equal intervals to the bottom of the lower frame 1. Several upper cylinders 9 are fixedly connected through the top of the upper frame 2 and are positioned above the lower cylinders 8. Several locking rods 10 are inserted into the inside of the upper cylinders 9.

[0025] The lower frame 1 has four fixedly connected positioning pins 11 at the bottom corners, and the upper frame 2 has four through-holes 12 at the top corners. The top of the positioning pin 11 is set as a smooth arc surface, which is convenient to be inserted into the corresponding positioning hole 12. The positioning hole 12 is opened directly above the positioning pin 11.

[0026] Positioning cylinders 13 are fixedly connected to the four corners of the top of the upper frame 2. Several spring positioning contacts 14 for pressing the components on the circuit board are equidistantly arranged at the top of the upper frame 2. When the upper frame 2 is flipped so that the spring positioning contacts 14 face downward and the whole is pressed down, the spring positioning contacts 14 contact the components on the circuit board. The elastic compression force of the spring is used to apply a uniform downward pressure to the components on the circuit board, realizing multi-point elastic pressing and positioning. This prevents the circuit board and components from warping and deforming due to heat during the soldering process, and avoids rigid pressure damage to precision components. The spring positioning contacts 14 are a mature technology in the prior art, and will not be described in detail here.

[0027] The pop-up mechanism includes an upper spring 15, a lower spring 16, an upper rod 17, and a lower rod 18. There is a pair of upper rods 17 and upper springs 15. The upper rods 17 are longitudinally slidably connected to the top of the limiting frame 5. The upper springs 15 are fixedly connected between the bottom of the upper rods 17 and the bottom of the inner end of the limiting frame 5. The top of the upper rods 17 is fixedly connected to the flipping frame 6.

[0028] There are three lower springs 16 and lower rods 18. All three lower rods 18 are installed through the top of the tilting frame 6. The bottom of each lower rod 18 is fixedly connected to a lower plate 19. The three lower springs 16 are fixedly connected between the top of the tilting frame 6 and the outer wall of the lower rod 18.

[0029] The positioning mechanism includes bolts 20, and a pair of bolts 20 are provided. A pair of through holes 21 are provided on both the front and rear sides of the lower frame 1. Threaded holes 22 are provided on both the side walls of the limiting frame 5. The bolts 20 pass through one of the through holes 21 and are threaded into the corresponding threaded hole 22.

[0030] During use, the circuit board is first placed in the placement slot 3 on the lower frame 1. At this time, the upper frame 2 is in a flipped state on the lower frame 1. Then, the upper frame 2 is flipped over, which will drive the flip hinge 7 to flip on the flip frame 6, thereby flipping the upper frame 2 to directly above the lower frame 1 (at this time, the flip frame 6 is in a state of being lifted by the upper spring 15 and the lower spring 16 under the action of the spring mechanism, so there is still a gap between the upper frame 2 and the lower frame 1). Then, the upper frame 2 can be pressed down, pushing the flip hinge 7, the flip frame 6 and the upper rod 17 to move downward. At this time, the downward movement of the upper rod 17 will compress the upper spring 15. At the same time, the lower plate 19 at the bottom of the lower rod 18 is in contact with the top of the lower frame 1. Therefore, when the flip frame 6 is pressed down, the lower spring 16 will be gradually stretched, thereby pressing the upper frame 2 onto the circuit board. At the same time, the positioning pin 11 will be inserted into the corresponding positioning hole 12, and the locking rod 10 will be inserted into the corresponding lower cylinder 8. Then the two-way locking structure can be rotated to lock the position of the upper frame 2 on the lower frame 1. Then the fixture will be placed in the welding station for welding processing.

[0031] When it is necessary to use the spring positioning contact 14 to position and clamp the components on the circuit board, first unscrew the bolts 20 on both sides to release the sliding position restriction of the limiting frame 5. Then, the limiting frame 5 can be pushed to slide inside the slide rail groove 4, and drive the flip frame 6, flip hinge 7 and upper frame 2 to move (during the movement, the flip frame 6 is in the lifting state due to the elastic force of the lower spring 16 of the upper spring 15). Until the limiting frame 5 is pushed to the other side of the slide rail groove 4, the bolt 20 can be inserted into another through hole 21 and threaded into the threaded hole 22 to fix the position of the limiting frame 5. Then, the circuit board can be placed in the placement slot 3, and the upper frame 2 can be flipped over to be placed on the lower frame 1. At this time, the spring positioning contact 14 will be flipped to the position above the components on the circuit board. Then, the upper frame 2 is pressed down, pushing the flip hinge 7, the flip frame 6 and the upper rod 17 to move downward. At this time, the upper spring 15 will be compressed by the downward movement of the upper rod 17. At the same time, the lower plate 19 at the bottom of the lower rod 18 is in contact with the top of the lower frame 1. Therefore, when the flip frame 6 is pressed down, the lower spring 16 will be gradually stretched, thereby pressing the spring positioning contact 14 on the top of the corresponding component on the circuit board. At the same time, the positioning pin 11 will be inserted into the corresponding positioning cylinder 13, and the other end of the locking rod 10 will be inserted into the lower cylinder 8. Finally, the two-way locking structure can be rotated to lock the position of the upper frame 2 on the lower frame 1. Then, the fixture is placed in the welding station for welding processing.

[0032] In summary, through the design of the above structure, when the upper frame 2 is flipped and blocked in the initial position, the spring positioning contact 14 is located above the upper frame 2, and the bottom surface of the upper frame 2 is in flexible contact with the top plane of the circuit board. This not only prevents dust but also provides horizontal positioning and flat support for the PCB. The upper frame 2 can be locked onto the lower frame 1 through the bidirectional locking structure. When it is necessary to press the components on the circuit board, the upper frame 2 is flipped 180° so that the spring positioning contact 14 faces downward. Then, the limiting frame 5 is released and pushed to the other end of the lower frame 1. The components on the circuit board can then be precisely pressed by the spring positioning contact 14. This structure achieves the dual functions of planar flipping positioning and contact pressing, avoiding accidental pressure damage in the blocked state. It is particularly suitable for double-sided mixed-assembly boards (where precision components such as BGA are mounted on the A side and require flat support), high component density boards, and flexible circuit boards, effectively improving welding accuracy and product yield.

[0033] Based on the above embodiments, it was found during use that if the locking structure does not have a two-way locking function, the dual-use function of the upper frame 2 cannot be realized. In order to solve the above problem, the above structure has been further improved.

[0034] The top of the upper cylinder 9 has a pair of top grooves 23, and the inner side of the top grooves 23 is longitudinally slidably connected to the top plate 24. The top plate 24 is fixedly connected to the positioning ring 25. The outer wall of the locking rod 10 has a circular groove 26, and the positioning ring 25 is rotatably connected to the inner side of the circular groove 26. The bottom end of the top groove 23 and the bottom end of the top plate 24 are fixedly connected to the positioning spring 27.

[0035] A pair of insert rods 28 are fixedly connected to the outer wall of the locking rod 10. One insert rod 28 is located at the bottom of the side wall of the locking rod 10, and the other insert rod 28 is located at the top of the other side of the locking rod 10. When the upper frame 2 is flipped over, it will cause the locking rod 10 to flip over together. If the two insert rods 28 are on the same side, the two-way locking structure will not be usable after the upper frame 2 is flipped over.

[0036] The length of the locking rod 10 extending from the top of the upper frame 2 is twice the length extending from the bottom of the upper frame 2. Both the top and bottom sides of the locking rod 10 are set as smooth arc surfaces. Since the top of the upper frame 2 is provided with a spring positioning contact 14, when a circuit board with components is placed in the lower frame 1, the distance between the upper frame 2 and the lower frame 1 will increase (the increased part is the compression part of the spring positioning contact 14). Therefore, it is necessary to increase the length of the upper part of the locking rod 10.

[0037] A vertical groove 29 is provided through the side wall of the lower cylinder 8, and an L-shaped groove 30 is provided on the side wall of the vertical groove 29.

[0038] When it is necessary to lock the position between the upper frame 2 and the lower frame 1, when the upper frame 2 is pressed down onto the circuit board, it will cause the locking rod 10 to insert into the lower cylinder 8. At the same time, it will cause the insertion rod 28 on the locking rod 10 to insert into the vertical groove 29. Then, after the upper frame 2 is fully inserted into the lower frame 1, the tops of multiple locking rods 10 can be pressed down in sequence, causing the locking rods 10 to move downward. At this time, the positioning ring 25 and the top plate 24 will move downward through the annular groove 26, and compress the positioning spring 27, so that the insertion rod 28 is fully inserted into the bottom end of the vertical groove 29. The locking rod 10 can be rotated to drive the insertion rod 28 into the L-shaped groove 30 until the insertion rod 28 rotates to the corner of the L-shaped groove 30. Then the locking rod 10 can be released. Subsequently, under the elastic force of the positioning spring 27, the top plate 24 and the positioning ring 25 are pushed upward, which in turn pushes the locking rod 10 and the insertion rod 28 to move upward, so that the insertion rod 28 is inserted into the vertical end of the L-shaped groove 30, thereby restricting the upward movement of the upper frame 2. This process is repeated to lock the other locking rods 10 onto the lower cylinder 8, thus completing the locking connection between the upper frame 2 and the lower frame 1. When unlocking is required, simply repeat the above steps in reverse. The same procedure applies when using the upper frame 2 in reverse.

[0039] In summary, through the above structural design, and regardless of whether the spring positioning contact 14 faces upward or downward, it can be locked and fixed with the lower frame 1 by the same latch. This design achieves the dual-mode sharing effect of the upper frame 2, eliminating the need for multiple upper frames 2, simplifying fixture management, avoiding mismatch risks, significantly reducing equipment costs, and improving production line changeover efficiency.

[0040] This invention covers any substitutions, modifications, equivalent methods and solutions made within the spirit and scope of this invention. In order to give the public a thorough understanding of this invention, specific details are described in detail in the preferred embodiments of this invention. However, those skilled in the art can fully understand this invention without these detailed descriptions. In addition, in order to avoid unnecessary confusion about the essence of this invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A circuit board manufacturing fixture locking structure, characterized in that, It includes a lower frame and an upper frame. The lower frame has a placement slot for placing a circuit board. The top two sides of the lower frame have through-slide rail slots. The slide rail slots have a limiting mechanism for limiting the upper frame. The upper frame and the lower frame have a two-way locking structure. The limiting mechanism includes a limiting frame, a flipping frame, and a flipping hinge. A pair of limiting frames are provided, and each limiting frame is laterally slidably connected to the inner side of a corresponding slide rail groove. The flipping frame is located between the top ends of the limiting frames. A pop-up mechanism is also provided for popping up the flipping frame and the upper frame after unlocking. A pair of flipping hinges are provided, and each flipping hinge is fixedly connected to the top end of the upper frame. Each flipping hinge is rotatably connected to the inner side of the flipping frame. A positioning mechanism is also provided for limiting the position of the limiting frame. The bidirectional locking structure includes a lower cylinder, an upper cylinder, and locking rods. Several lower cylinders, upper cylinders, and locking rods are provided. Several lower cylinders are equidistantly fixedly connected to the bottom of the lower frame. Several upper cylinders are fixedly connected through the top of the upper frame and are positioned above the lower cylinders. Several locking rods are inserted into the inner side of the upper cylinders.

2. The circuit board manufacturing fixture locking structure according to claim 1, characterized in that, The lower frame is fixedly connected to four corners at the bottom, and the upper frame is provided with four through-holes at the top. The top of the positioning pin is set as a smooth arc surface, and the positioning hole is opened directly above the positioning pin.

3. The circuit board manufacturing fixture locking structure according to claim 1, characterized in that, Positioning cylinders are fixedly connected to the four corners of the top of the upper frame, and several spring positioning contacts for pressing the components on the circuit board are provided at equal intervals at the top of the upper frame.

4. The circuit board manufacturing fixture locking structure according to claim 1, characterized in that, The pop-up mechanism includes an upper spring, a lower spring, an upper rod, and a lower rod. Each upper rod and upper spring is provided in pairs. The upper rod is longitudinally slidably connected to the top of the limiting frame. The upper spring is fixedly connected between the bottom end of the upper rod and the bottom end of the limiting frame. The top end of the upper rod is fixedly connected to the flipping frame.

5. The circuit board manufacturing fixture locking structure according to claim 4, characterized in that, There are three lower springs and lower rods. All three lower rods are installed through the top of the tilting frame. The bottom of each lower rod is fixedly connected to a lower plate. The three lower springs are fixedly connected between the top of the tilting frame and the outer wall of the lower rod.

6. The circuit board manufacturing fixture locking structure according to claim 1, characterized in that, The positioning mechanism includes bolts, and a pair of bolts are provided. A pair of through holes are provided on both the front and rear sides of the lower frame, and threaded holes are provided on both the side walls of the limiting frame. The bolt passes through one of the through holes and is threaded into the corresponding threaded hole.

7. The circuit board manufacturing fixture locking structure according to claim 1, characterized in that, The top of the upper cylinder has a pair of top grooves, and a top plate is longitudinally slidably connected to the inner side of each top groove. A positioning ring is fixedly connected between the top plates. A circular groove is opened on the outer wall of the locking rod. The positioning ring is rotatably connected to the inner side of the circular groove. A positioning spring is fixedly connected between the bottom end of the top groove and the bottom end of the top plate.

8. The circuit board manufacturing fixture locking structure according to claim 1, characterized in that, A pair of insert rods are fixedly connected to the outer wall of the locking rod, one of which is located at the bottom end of the side wall of the locking rod, and the other insert rod is located at the top end of the other side of the locking rod.

9. The circuit board manufacturing fixture locking structure according to claim 1, characterized in that, The length of the locking rod extending from the top of the upper frame is twice the length extending from the bottom of the upper frame, and both the top and bottom sides of the locking rod are set as smooth arc surfaces.

10. The circuit board manufacturing fixture locking structure according to claim 1, characterized in that, The lower cylinder sidewall has a through vertical groove, and the sidewall of the vertical groove has an L-shaped groove.

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