Dynamically adjustable welding limiting pressing plate and multi-point positioning jig
By designing a dynamically adjustable welding limit pressure plate, and using the central hollow part and sliding hole structure, the problem that existing welding fixtures cannot effectively compress the warped PCBA board, achieving higher flexibility and accuracy, and reducing costs.
Patent Information
- Application Number
- CN202311381468.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-24
- Publication Date
- 2025-04-25
AI Technical Summary
When dealing with warped and deformed PCBA boards, existing wave soldering furnace fixtures cannot effectively press the convex position in the middle, resulting in tin punching, resulting in poor welding and thermal damage.
A dynamically adjustable welding limit pressure plate is designed, and the structure of the central hollow part, the first sliding hole and the sliding bar and the second sliding hole on it is designed to realize the free arrangement of the press and improve flexibility and accuracy.
Through the dynamically adjustable limit pressure plate structure, the need for dense hole openings is avoided, the cost is reduced, the accuracy is improved, and the components on the PCBA board are conveniently protected.
Smart Images
Figure CN119893879A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of welding jigs, and in particular to a dynamically adjustable welding limiting pressure plate and a multi-point positioning jig. Background Art
[0002] Most of the existing wave soldering jigs are ordinary ones, which are made of high temperature resistant synthetic stone as the base material and are made into rectangular brackets. The middle part is opened and thinned. When the PCBA with the plug-in is placed in the furnace for soldering, the tin wave will pass through the opening and solder. However, after the PCBA has gone through the previous reflow process, the board surface will be warped to varying degrees, resulting in incomplete fit with the wave soldering jig. Even if the jig is designed with a pressing block to press the PCBA board around, the convex position in the middle of the PCBA board cannot be pressed, resulting in the gap between the PCBA and the wave soldering jig. Tin flushing will cause poor soldering and thermal damage to the direct plug-in device, and damage to the soldering of the patch. In severe cases, it will also cause thermal damage to the PCBA.
[0003] Some technicians have tried to solve the above problem by designing a pressure plate. Specifically, a pressure plate is added and a pressure head is set on the pressure plate to position the middle part of the PCBA board. However, the existing positioning is usually achieved by using limited positioning holes. Although the flexibility of the pressure head position can be improved by increasing the arrangement density of the positioning holes, the excessive density of the positioning holes will lead to an increase in the hole opening cost, a decrease in accuracy, and inconvenience in use. Summary of the invention
[0004] The purpose of the present invention is to provide a dynamically adjustable welding limit pressure plate and a multi-point positioning fixture. By designing the structure of the central hollow portion, the first strip sliding hole, the sliding bar and the second strip sliding hole thereon, the free arrangement of the pressing parts can be achieved, thereby improving flexibility. There is no need to adopt a dense hole opening solution, which reduces costs and improves precision.
[0005] The purpose of the present invention can be achieved by the following technical solutions:
[0006] A dynamically adjustable welding limit pressure plate comprises a flat plate and a plurality of pressure pieces arranged on the flat plate, the flat plate being provided with a central hollow portion and two first strip sliding holes located on both sides of the central hollow portion, the limit pressure plate also comprising a plurality of sliding bars, the sliding bars being provided with second strip sliding holes distributed along the axial direction of the sliding bars, the two first strip sliding holes being arranged in parallel, the two ends of the sliding bars being respectively arranged in the two first strip sliding holes and sliding along the first strip sliding holes, and the pressure piece being arranged in the second strip sliding hole.
[0007] The pressing piece includes a screw, a pressing head and a spring. The diameter of the screw is consistent with the width of the second strip-shaped sliding hole. A supporting nut is provided at one end of the screw. The pressing head is provided at the second end of the screw. The radial cross-sections of the pressing head and the supporting nut are both larger than the radial cross-section of the screw. The two ends of the spring are respectively supported on the pressing head and the sliding bar, and the sliding bar is clamped between the spring and the supporting nut.
[0008] At least one of the support nut and the pressure head is detachably connected to the screw rod.
[0009] The pressing piece is slidably arranged along the second strip-shaped sliding hole.
[0010] The area of the central hollow portion accounts for more than 70% of the area of the flat plate.
[0011] Both ends of the sliding bar are provided with sliding screws, one end of the sliding screw is fixed on the sliding bar, and the other end is provided with a sliding nut, the radial cross-section of the sliding nut is larger than the radial cross-section of the sliding screw, and the outer diameter of the sliding screw is consistent with the width of the first strip sliding hole.
[0012] At least one of the sliding nut and the sliding bar is detachably connected to the sliding screw.
[0013] The detachable connection is a threaded connection.
[0014] The first strip-shaped sliding hole and the second strip-shaped sliding hole are vertically arranged.
[0015] A multi-point positioning fixture comprises a PCBA bracket and the above-mentioned limiting pressure plate.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] 1. By designing the structure of the central hollow part, the first strip sliding hole, the sliding bar and the second strip sliding hole thereon, the pressing parts can be freely arranged, thereby improving flexibility, eliminating the need for a dense hole opening solution, reducing costs and improving precision.
[0018] 2. The design of elastic pressing parts is adopted to protect the components on the PCBA board.
[0019] 3. At least one of the support nut and the pressure head is detachably connected to the screw rod, which is convenient for disassembly and assembly to change the layout.
[0020] 4. The area of the central hollow part accounts for more than 70% of the area of the flat plate, and the material utilization rate is high.
[0021] 5. The design of sliding screw and sliding nut improves convenience.
[0022] 6. The first strip sliding hole and the second strip sliding hole are arranged vertically, which reduces the difficulty of adjusting the position of the pressing piece. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a structural schematic diagram of the limiting pressure plate of the present invention;
[0024] Figure 2 It is a schematic diagram of the position limiting pressing plate of the present invention when viewed from an oblique upward angle;
[0025] Figure 3 It is a schematic diagram of an existing PCBA bracket;
[0026] Wherein: 1. synthetic stone base plate, 2. base plate reinforcement frame, 3. heat insulation cover, 4. pressure block, 5. indicator light positioning strip, 6. pressure plate buckle, 7. pressure plate fixing stud, 8. fixing block, 9. PCBA board, 10. indicator light, 11. pressure head, 12. spring, 13. screw, 14. plate, 15. sliding screw, 16. pressure plate positioning hole, 17. second strip sliding hole, 18. sliding bar, 19. first strip sliding hole, 14-1, central hollow part. DETAILED DESCRIPTION
[0027] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.
[0028] A dynamically adjustable welding limit plate, such as Figure 1 and Figure 2 As shown, it includes a flat plate 14 and a plurality of pressing pieces arranged on the flat plate, the flat plate 14 is provided with a central hollow portion 14-1 and two first strip sliding holes 19 located on both sides of the central hollow portion 14-1, the limiting pressing plate also includes a plurality of sliding bars 18, the sliding bars 18 are provided with second strip sliding holes 17 distributed along the axial direction of the sliding bars 18, the two first strip sliding holes 19 are arranged in parallel, the two ends of the sliding bars 18 are respectively arranged in the two first strip sliding holes 19 and slide along the first strip sliding holes 19, and the pressing piece is arranged in the second strip sliding hole 17. The pressing piece is arranged to slide along the second strip sliding hole 17.
[0029] By designing the structure of the central hollow portion 14-1, the first strip sliding hole 19, the sliding bar 18 and the second strip sliding hole 17 thereon, the pressing parts can be freely arranged, thereby improving flexibility, eliminating the need for a dense hole opening solution, reducing costs and improving precision.
[0030] The pressing piece includes a screw 13, a pressure head 11 and a spring 12. The diameter of the screw 13 is consistent with the width of the second strip sliding hole 17. A support nut is provided at one end of the screw 13. The pressure head 11 is provided at the second end of the screw 13. The radial cross-sections of the pressure head 11 and the support nut are both larger than the radial cross-section of the screw 13. The radial cross-section is a cross-section perpendicular to the axial direction. The two ends of the spring 12 are supported on the pressure head 11 and the sliding bar 18 respectively, and the sliding bar 18 is clamped between the spring 12 and the support nut. The design of the elastic pressing piece is adopted to facilitate the protection of the components on the PCBA board. In general, the radial cross-section of the support nut should be a rotationally symmetrical figure, so as to improve stability.
[0031] In addition, in most embodiments, at least one of the support nut and the pressure head 11 is detachably connected to the screw rod 13, which is convenient for disassembly and assembly to change the layout. Generally, it is more convenient to select a detachable connection between the support nut and the screw rod 13, and there is no need to remove the spring 12 when moving the position. In this embodiment, the detachable connection is a threaded connection.
[0032] In most embodiments, the area of the central hollow portion 14 - 1 accounts for more than 70% of the area of the flat plate 14 , and the material utilization rate is high.
[0033] In most embodiments, sliding screws 15 are provided at both ends of the sliding bar 18, one end of the sliding screw 15 is fixed to the sliding bar 18, and the other end is provided with a sliding nut, the radial cross-section of the sliding nut is larger than the radial cross-section of the sliding screw 15, and the outer diameter of the sliding screw 15 is consistent with the width of the first strip-shaped sliding hole 19, thereby improving convenience.
[0034] Similarly, in most embodiments, at least one of the sliding nut and the sliding bar 18 is detachably connected to the sliding screw 15 for easy disassembly and assembly. Similarly, in this embodiment, the detachable connection is a threaded connection.
[0035] In addition, the first strip-shaped sliding hole 19 and the second strip-shaped sliding hole 17 are vertically arranged, which reduces the difficulty of adjusting the position of the pressing piece.
[0036] Another aspect of the present application provides a multi-point positioning fixture, including a PCBA bracket and a limiting pressure plate as described above, wherein the PCBA bracket is used to place the PCBA board 9, and can adopt an existing design, such as Figure 3As shown, it includes a synthetic stone base plate 1, a base plate reinforcement frame 2, 9 pressing blocks 4 for pressing the PCBA board, an indicator light positioning card strip combination, a pair of pressure plate buckles 6 and 4 pressure plate fixing studs 7. The synthetic stone base plate 1 is connected to the base plate reinforcement frame 2 by screws; the pressure block 4 is connected to the synthetic stone base plate 1 by a screw spring combination; the indicator light positioning card strip combination is composed of an indicator light positioning card strip 5 and two fixing blocks 8, the fixing blocks 8 are connected to the synthetic stone base plate 1 by screws, and the indicator light positioning card strip 5 is installed in the card slots of the two fixing blocks 8; a pair of pressure plate buckles 6 and 4 pressure plate fixing studs 7 are connected to the synthetic stone base plate 1 by screws. The heat insulation cover 3 is provided with an indicator light cavity, which is installed in conjunction with the indicator light 10. In order to cooperate with the PCBA bracket, a pressure plate positioning hole 16 is also provided on the flat plate 14.
[0037] The indicator light positioning card strip 5 is fixed on the synthetic stone base plate 1 by a fixing block, but can move in one direction. The indicator light positioning card strip 5 is provided with an indicator light lamp holder slot, which can be used to position the indicator light lamp holder. The four pressure plate fixing studs 7 and the pressure plate buckle 6 are connected with the limiting pressure plate to fix the limiting pressure plate in balance; the heat insulation cover is in the shape of a long strip and is provided with a row of indicator light cavities, which are installed in conjunction with the indicator light.
[0038] Here’s how it works:
[0039] Open the pressing block 4 on the PCBA bracket, put in the PCBA board 9 that has been inserted, close the pressing block 4, align the indicator light cavity of the heat insulation cover 3, place the heat insulation cover 3 on the indicator light 10, move the indicator light positioning card strip 5 to the lamp head of the indicator light 10, and clamp the lamp head;
[0040] Loosen the sliding screw 15, adjust the sliding bar 18 according to the position point where compression is required, assemble the screw spring combination and the pressure head 11, connect the pressure plate positioning hole 16 with the pressure plate positioning bolt 7, press down the pressure plate, so that the pressure head presses the corresponding components and heat insulation cover until the pressure plate buckle 6 clamps the pressure plate.
Claims
1. A dynamically adjustable welding limit pressure plate, comprising a flat plate (14) and a plurality of pressure pieces arranged on the flat plate, characterized in that: The flat plate (14) is provided with a central hollow portion (14-1) and two first strip-shaped sliding holes (19) located on both sides of the central hollow portion (14-1); the limit pressure plate also includes a plurality of sliding bars (18); the sliding bars (18) are provided with second strip-shaped sliding holes (17) distributed along the axial direction of the sliding bars (18); the two first strip-shaped sliding holes (19) are arranged in parallel; the two ends of the sliding bar (18) are respectively arranged in the two first strip-shaped sliding holes (19) and slide along the first strip-shaped sliding holes (19); the pressure piece is arranged in the second strip-shaped sliding hole (17).
2. A dynamically adjustable welding limit plate according to claim 1, characterized in that: The pressing piece comprises a screw (13), a pressing head (11) and a spring (12); the diameter of the screw (13) is consistent with the width of the second strip-shaped sliding hole (17); a supporting nut is provided at one end of the screw (13); the pressing head (11) is provided at the second end of the screw (13); the radial cross-sections of the pressing head (11) and the supporting nut are both larger than the radial cross-section of the screw (13); the two ends of the spring (12) are respectively supported on the pressing head (11) and the sliding bar (18), and the sliding bar (18) is clamped between the spring (12) and the supporting nut.
3. A dynamically adjustable welding limit plate according to claim 2, characterized in that: At least one of the support nut and the pressure head (11) is detachably connected to the screw rod (13).
4. The dynamically adjustable welding limit plate according to claim 1, characterized in that: The pressing piece is slidably arranged along the second strip-shaped sliding hole (17).
5. The dynamically adjustable welding limit plate according to claim 1, characterized in that: The area of the central hollow portion (14-1) accounts for more than 70% of the area of the flat plate (14).
6. The dynamically adjustable welding limit plate according to claim 1, characterized in that: Both ends of the sliding bar (18) are provided with sliding screws (15), one end of the sliding screw (15) is fixed on the sliding bar (18), and the other end is provided with a sliding nut, the radial cross-section of the sliding nut is larger than the radial cross-section of the sliding screw (15), and the outer diameter of the sliding screw (15) is consistent with the width of the first strip-shaped sliding hole (19).
7. The dynamically adjustable welding limit plate according to claim 6, characterized in that: At least one of the sliding nut and the sliding bar (18) is detachably connected to the sliding screw (15).
8. A dynamically adjustable welding limit plate according to claim 3 or 7, characterized in that: The detachable connection is a threaded connection.
9. The dynamically adjustable welding limit plate according to claim 1, characterized in that: The first strip-shaped sliding hole (19) and the second strip-shaped sliding hole (17) are arranged vertically.
10. A multi-point positioning fixture, characterized in that: It comprises a PCBA bracket and a limiting pressure plate as described in any one of claims 1-9.