A CQFP component pin trimming fixture

Abstract

The application discloses a CQFP component pin trimming clamp, which comprises a base, a pin position reference element, a height adjusting mechanism, a clamping mechanism and a tightness switching mechanism arranged on the base, the reference element is arranged on the height adjusting mechanism, the clamping mechanism is used for clamping and positioning the component, the tightness switching mechanism is used for driving the clamping mechanism to clamp or release the component, and a plurality of pin reference positions are arranged on the pin position reference element, which are used for providing reference positions when trimming the pins on the component; when trimming the pins, the height of the pin position reference element is adjusted by the height adjusting mechanism so as to adjust the distance between the pin reference positions and the pins to a preset distance. The application has the advantages of simple overall structure, convenient use, high operation efficiency, labor saving, low cost, stable clamping quality and the like, solves the clamping and positioning problem of the component, and shows the superiority when trimming the CQFP component pins.

Description

Technical Field

[0001] This invention belongs to the field of component lead trimming technology, and particularly relates to a CQFP component lead trimming fixture. Background Technology

[0002] CQFP (Ceramic Quad Flat Package) components offer advantages such as excellent hermeticity, high pin density, and high reliability, and are commonly used in military and aerospace products. If CQFP components experience pin warping, poor coplanarity, or lateral misalignment during forming, storage, or transportation, the problematic pins must be individually repaired to avoid affecting subsequent soldering reliability and prevent issues such as solder joint failure or device malfunction.

[0003] However, CQFPs have small pin pitch, thin pins, and a large number of pins, making trimming difficult and inefficient. Common trimming methods include manual trimming and equipment trimming. Manual trimming requires tools such as vacuum pens, smooth plates, and probes. Since there are no reference process pads and it is impossible to completely fix the shaped component, it relies heavily on the operator's skill and experience. Currently, the commonly used CQFP component rework equipment on the market is expensive, making it difficult to promote and apply on a large scale. Summary of the Invention

[0004] To address the problems in the background art, the purpose of this invention is to provide a CQFP component pin trimming fixture, including a base, a pin position reference, and a height adjustment mechanism, a clamping mechanism, and a tension switching mechanism disposed on the base, wherein the reference is disposed on the height adjustment mechanism;

[0005] The clamping mechanism is used to clamp and position the component, and the tension switching mechanism is used to drive the clamping mechanism to clamp or loosen the component.

[0006] The pin position reference component is provided with a plurality of pin reference positions, which are used to provide a reference position when trimming the pins on the component;

[0007] When trimming the pin, the height of the pin position reference is adjusted by the height adjustment mechanism to adjust the distance between the pin reference position and the pin to a preset distance.

[0008] Preferably, the pin position reference member has a first receiving hole in the middle, the clamping mechanism is disposed in the first receiving hole, and the pin reference position is disposed on the upper end surface of the pin position reference member on the periphery.

[0009] Preferably, the pin position reference is a tooling printed circuit board, and the pin reference position is a process pad on the tooling printed circuit board, which is made of a printed circuit board for mounting the component.

[0010] Preferably, the height adjustment mechanism includes a plurality of adjusting screws and a plurality of adjusting springs, wherein the adjusting springs are sleeved on the adjusting screws;

[0011] The pin position reference component is provided with a plurality of mounting holes, and the base is provided with a plurality of mounting screw holes in a number and position corresponding one-to-one with the mounting holes;

[0012] The adjusting screw passes through the mounting hole and is threaded into the mounting screw hole. The adjusting spring is located between the base and the pin position reference and is in a compressed state.

[0013] Preferably, the upper surface of the base is provided with a number of bosses corresponding to the mounting holes one by one. Each boss is provided with a stepped hole coaxial with the mounting hole. The mounting screw hole is located at the lower part of the stepped hole. The upper part of the stepped hole is a smooth hole with a diameter larger than that of the mounting screw hole. The adjusting spring is located in the smooth hole.

[0014] Preferably, a barrier assembly is provided on the periphery of the pin position reference member to limit the pin position reference member and prevent it from tilting when it moves up and down.

[0015] Preferably, the enclosure assembly includes four baffles, which are respectively disposed around the pin position reference member;

[0016] The baffle is provided with adjusting oblong holes at at least at both ends. A first mounting screw passes through the adjusting oblong holes and is threaded to the base to install the baffle on the base. The gap between the baffle and the pin position reference can be adjusted through the adjusting oblong holes.

[0017] Preferably, the clamping mechanism includes a fixed clamping member, a movable clamping member, a sliding member, a fixed slider, and a clamping elastic member, and the base is provided with a second receiving hole corresponding to the first receiving hole;

[0018] The fixing clamp is located in the first receiving hole and the second receiving hole, and the fixing clamp is fixed to the lower end face of the base by a mounting flange;

[0019] The fixed slider is fixed to the lower end face of the base, the sliding member is located on the lower end face of the base and passes below the second receiving hole, and the sliding member is slidably connected to the fixed slider; the clamping elastic member is disposed between the sliding member and the fixed slider, and the clamping elastic member applies an elastic force to the sliding member toward the fixed clamping member;

[0020] The movable clamping member is fixed on the sliding member and located within the first receiving hole and the second receiving hole;

[0021] The movable clamping member is driven by the elastic force of the clamping elastic member to move toward the fixed clamping member to clamp the component, and the tension switching mechanism drives the sliding member to overcome the elastic force of the clamping elastic member and move away from the fixed clamping member to release the component.

[0022] Preferably, both the fixed clamping member and the movable clamping member are composed of two vertical plates arranged at an angle, and the fixed clamping member and the movable clamping member are diagonally arranged to clamp the adjacent sidewalls at opposite ends of the component, respectively, and the angle between the two vertical plates matches the angle of the adjacent ends of the component.

[0023] The upper surfaces of each of the vertical plates are of equal height and serve as bearing surfaces. The components are placed on the bearing surfaces, and a retaining edge is provided on the side of the bearing surface away from the components. The retaining edge is used to clamp the side wall of the components.

[0024] Preferably, the sliding member is provided with a stepped groove, the upper groove width of the stepped groove is smaller than the lower groove width, the fixed slider is a T-shaped slider, the T-shaped slider is disposed in the stepped groove, and the upper width of the T-shaped slider is smaller than the lower width, the upper part of the T-shaped slider is disposed in the upper part of the stepped groove, and the lower part is disposed in the lower part of the stepped groove;

[0025] The clamping elastic element is a clamping spring, which is located between the inner wall of one end of the stepped slide groove and one end of the T-shaped slider and is in a compressed state.

[0026] Preferably, the tension switching mechanism includes a switching slide rod, which is slidably connected to the lower end face of the base;

[0027] One side wall of the switching slide bar is opposite to one end of the sliding member and is used to drive the sliding member to slide. One end of the switching slide bar is a loose end and the other end is a tight end. The width of the loose end is greater than that of the tight end, and the width of the loose end gradually decreases to transition to the tight end.

[0028] When the switching slider slides to the point where the loose end is opposite to the sliding member, the side wall of the loose end abuts against the sliding member and pushes the sliding member away from the fixed clamping member, thereby causing the movable clamping member to move away from the fixed clamping member and release the component.

[0029] When the switching slide bar slides to the tight end opposite the sliding member, the sliding member is driven to slide toward the fixed clamping member by the elastic force of the clamping elastic member, so as to drive the movable clamping member to move toward the fixed clamping member to clamp the component.

[0030] Preferably, one end of the slider is provided with a stop shaft, and one side wall of the switching slide rod is opposite to the stop shaft, and pushes the slider to slide by abutting against the stop shaft.

[0031] Preferably, it includes at least two pressure blocks, the pressure blocks are fixed to the lower end face of the base, the upper end face of the pressure blocks is provided with a sliding groove, and the switching slide rod is slidably connected in the sliding groove.

[0032] Preferably, the upper end face of the switching slide bar is provided with at least one stop post, and the base is provided with at least one limiting groove along the sliding direction of the switching slide bar. The stop post is disposed in the limiting groove, and the stop post and the limiting groove cooperate to limit the sliding stroke of the switching slide bar.

[0033] Preferably, the base includes a substrate and an outer cover, the outer cover is fixed to the lower end face of the substrate, the height adjustment mechanism is disposed on the upper end face of the substrate, the clamping mechanism and the tension switching mechanism are both disposed on the lower end face of the substrate and located inside the outer cover, and the upper end of the clamping mechanism extends to the upper end face of the substrate.

[0034] Because the present invention adopts the above technical solution, it has the following advantages and positive effects compared with the prior art:

[0035] 1. This invention uses a clamping mechanism to hold and position components, facilitating subsequent trimming of component leads. During trimming, a lead position reference provides a reference position for the lead, ensuring accurate trimming to the correct location. Simultaneously, a height adjustment mechanism adjusts the height of the lead position reference to ensure the distance between the reference position and the lead is within a preset range, eliminating reference errors. Excessive distance between the reference position and the lead can lead to visual inaccuracies and incomplete lead trimming. The height adjustment mechanism also makes the fixture more adaptable, accommodating different lead heights of various components. The height of the lead position reference can be quickly and adaptively adjusted according to the post-forming lead height of different components. In summary, this invention features a simple overall structure, ease of use, high operational efficiency, labor-saving operation, low cost, and stable clamping quality, effectively solving the component clamping and positioning problem. Its superiority is particularly evident when trimming CQFP component leads.

[0036] 2. The pin position reference component of this invention is a tooling printed circuit board (PCB). The pin reference position is the process pad on the tooling PCB. The tooling PCB is made from a PCB used for mounting components, allowing the tooling PCB to be manufactured by modifying existing PCBs used for mounting components. This reduces manufacturing costs. Furthermore, because the PCB itself has process pads for soldering components, the pin reference position is more accurate, resulting in smaller manufacturing errors. Simultaneously, during component changeovers, tooling PCBs can be quickly fabricated according to the PCBs of different component types, making changeovers more rapid.

[0037] 3. Both the fixed clamping component and the movable clamping component of the present invention are composed of two vertical plates arranged at an angle. The fixed clamping component and the movable clamping component are arranged diagonally and are used to clamp the adjacent side walls of the diagonal ends of the component, so that components of different sizes can be clamped, making it more adaptable.

[0038] 4. The sliding member of the present invention is driven to slide toward the fixed clamping member by the elastic force of the clamping elastic member, so as to drive the movable clamping member to move toward the fixed clamping member to clamp the component. In other words, the clamping force is provided by the elastic force, which makes the clamping force stable and will not damage the component due to operation error. Attached Figure Description

[0039] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0040] Figure 1 This is an overall schematic diagram of the present invention;

[0041] Figure 2 This is a schematic diagram of the base and height adjustment mechanism of the present invention;

[0042] Figure 3 For the present inventionFigure 2 Exploded view;

[0043] Figure 4 This is a schematic diagram of the upper end face of the base plate of the present invention;

[0044] Figure 5 This is a schematic diagram of the lower end face of the base plate of the present invention;

[0045] Figure 6 Schematic diagram of the clamping mechanism of the present invention Figure 1 ;

[0046] Figure 7 Schematic diagram of the clamping mechanism of the present invention Figure 2 ;

[0047] Figure 8 Schematic diagram of the clamping mechanism of the present invention Figure 3 ;

[0048] Figure 9 This is an exploded view of the clamping mechanism of the present invention;

[0049] Figure 10 This is a schematic diagram of the tension switching mechanism of the present invention. Figure 1 ;

[0050] Figure 11 This is a schematic diagram of the tension switching mechanism of the present invention. Figure 2 ;

[0051] Figure 12 This is a schematic diagram of the CQFP component of the present invention;

[0052] Figure 13 This is a top view of the invention in a relaxed state;

[0053] Figure 14 This is a bottom view of the invention in a relaxed state;

[0054] Figure 15 This is a cross-sectional view of the relaxed state of the present invention;

[0055] Figure 16 This is a top view of the clamped state of the present invention;

[0056] Figure 17 This is a bottom view of the clamped state of the present invention;

[0057] Figure 18 This is a cross-sectional view of the clamped state of the present invention;

[0058] Figure 19 This is a schematic diagram showing the relaxed state of the CQFP components in this invention;

[0059] Figure 20 This is a schematic diagram showing the clamping state of the CQFP components in this invention.

[0060] Explanation of reference numerals in the attached figures:

[0061] 1. Base; 11. Base plate; 111. Boss; 112. Second receiving hole; 113. Limiting groove; 12. Outer cover; 121. Second mounting screw; 13. Tooling printed circuit board; 131. Adjusting screw; 132. First receiving hole; 14. Baffle; 141. First mounting screw; 142. Adjusting oval hole; 15. Adjusting spring; 2. Clamping mechanism; 21. Fixed clamping component; 211. First bearing surface; 212. First flange; 213. Mounting flange; 21 4. Vertical plate; 22. Sliding component; 221. Second bearing surface; 222. Second retaining edge; 223. Stepped groove; 224. Component surface; 225. Stop shaft; 23. Clamping spring; 24. T-shaped slider; 241. Flat bottom hole; 25. Movable clamping component; 3. Tightening switching mechanism; 31. Switching slide rod; 311. Inclined surface; 312. Stop post; 32. Pressure block; 4. CQFP component; 5. Third mounting screw; 6. Fourth mounting screw; 7. Fifth mounting screw. Detailed Implementation

[0062] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0063] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0064] See Figures 1 to 20 The core of this invention is to provide a CQFP component pin trimming fixture, including a base 1, a pin position reference, and a height adjustment mechanism, a clamping mechanism 2, and a tension switching mechanism 3 disposed on the base 1, with the reference being disposed on the height adjustment mechanism.

[0065] The base 1 includes a substrate and an outer cover 12. The outer cover 12 is fixed to the periphery of the lower end face of the substrate by a number of second mounting screws 121. The height adjustment mechanism is located on the upper end face of the substrate. The clamping mechanism 2 and the tension switching mechanism 3 are both located on the lower end face of the substrate and inside the outer cover 12. The upper end of the clamping mechanism 2 extends to the upper end face of the substrate.

[0066] The clamping mechanism 2 is used to clamp and position the component, and the tension switching mechanism 3 is used to drive the clamping mechanism 2 to clamp or release the component. By clamping the component, the pins on the component can be trimmed using tools later. In this embodiment, the component is a CQFP component 4, which is square in shape. The pin position reference piece is provided with several pin reference positions, which are used to provide a reference position when trimming the pins on the component.

[0067] Specifically, the pin position reference component has a square first receiving hole 132 in the middle, the clamping mechanism 2 is disposed in the first receiving hole 132, and the pin reference position is disposed on the upper end surface of the pin position reference component. By aligning the pins on the CQFP component 4 with the corresponding pin reference positions in the horizontal or vertical direction, the component can be adjusted into position, thus enabling the pins to be accurately adjusted to the correct position.

[0068] Furthermore, when trimming the pins, the height of the pin position reference piece is first adjusted using the height adjustment mechanism to adjust the distance between the pin reference position and the pin to a preset distance. This ensures that no errors occur during reference, because if the distance between the pin reference position and the pin is too large, visual reference will produce errors, resulting in incomplete pin trimming. The height adjustment mechanism also makes this fixture more adaptable, accommodating different pin heights of different CQFP components 4. The height of the pin position reference piece can be quickly and adaptively adjusted according to the pin height dimensions after the different CQFP components 4 are formed.

[0069] In this embodiment, the pin position reference is a hollow square tooling printed circuit board 13, and the pin reference position is the process pad on the tooling printed circuit board 13. The tooling printed circuit board 13 is made from a printed circuit board used to mount CQFP components 4. This allows the tooling printed circuit board 13 to be manufactured by modifying existing printed circuit boards used to mount CQFP components 4, resulting in low manufacturing cost. Furthermore, since the printed circuit board itself has process pads for soldering CQFP components 4, the orientation of the pin reference position is more accurate, reducing manufacturing errors. At the same time, during model changeovers, the tooling printed circuit board 13 can be quickly manufactured according to printed circuit boards of different types of CQFP components 4, making model changeovers more rapid.

[0070] The height adjustment mechanism includes several adjusting screws 131 and several adjusting springs 15, with the adjusting springs 15 sleeved on the adjusting screws 131. In this embodiment, four sets of adjusting screws 131 and adjusting springs 15 are provided, respectively located at the four corners of the tooling printed circuit board 13. The tooling printed circuit board 13 has four mounting holes, respectively located at its four corners. The substrate has mounting screw holes in a number and position corresponding to the mounting holes. Specifically, the upper end face of the base 1 has bosses 111 in a number and position corresponding to the mounting holes. The bosses 111 have stepped holes coaxial with the mounting holes. The mounting screw holes are located at the lower part of the stepped holes, and the upper part of the stepped holes is a smooth hole with a diameter larger than that of the mounting screw holes.

[0071] The adjusting screw 131 passes through the mounting hole and is threaded into the mounting screw hole. The adjusting spring 15 is located between the substrate and the tooling printed circuit board 13 and is situated within the aperture. The adjusting spring 15 is in a compressed state, always providing upward elastic force to the tooling printed circuit board 13, ensuring that it remains in contact with the head of the adjusting screw 131 without coming loose. The vertical movement height of the tooling printed circuit board 13 can be adjusted by adjusting the depth to which the adjusting screw 131 is screwed into the mounting screw hole. When the tooling printed circuit board 13 is in its lowest position and is in contact with the upper end face of the boss 111, the upward movement range of the tooling printed circuit board 13 from the lowest position is (0, h). Therefore, it is necessary to ensure that the selected adjusting spring 15 has sufficient elastic force within the height range of (0, h) to ensure that the upper end face of the tooling printed circuit board 13 is completely in contact with the head of the adjusting screw 131.

[0072] Furthermore, a barrier assembly is provided on the periphery of the tooling printed circuit board 13 to limit the tooling printed circuit board 13 and prevent it from tilting when it moves up and down.

[0073] Specifically, the enclosure assembly includes four baffles 14, which are respectively disposed around the perimeter of the tooling printed circuit board 13. Each baffle 14 has an adjusting oblong hole 142 at at least two ends. A first mounting screw 141 passes through the adjusting oblong hole 142 and is threaded to the substrate to install the baffle 14 onto the substrate. The gap between the baffle 14 and the tooling printed circuit board 13 can be adjusted by adjusting the oblong hole 142. After the tooling printed circuit board 13 is installed in place, the gap between the baffle 14 and the tooling printed circuit board 13 is adjusted appropriately to ensure that the tooling printed circuit board 13 can slide smoothly up and down along the baffle 14 in a horizontal position. Then, the baffle 14 is fixed to the base plate 11 with the first mounting screw 141.

[0074] The clamping mechanism 2 includes a fixed clamping member 21, a movable clamping member 25, a sliding member, a fixed slider, and a clamping elastic member. The substrate has a second receiving hole 112 corresponding to the first receiving hole 132, and the second receiving hole 112 is also a square hole. The fixed clamping member 21 is located in the first receiving hole 132 and the second receiving hole 112, and the fixed clamping member 21 is fixed to the lower end face of the substrate by a mounting flange. The mounting flange is fixed to the lower end face of the substrate by a plurality of third mounting screws 5.

[0075] The fixed slider is fixed to the lower end face of the substrate, and the sliding member is located on the lower end face of the substrate and passes below the second receiving hole 112. The sliding member is slidably connected to the fixed slider. The clamping elastic member is disposed between the sliding member and the fixed slider, and the clamping elastic member applies an elastic force to the sliding member toward the fixed clamping member 21. Specifically, the sliding member is provided with a stepped groove, the upper groove width of which is smaller than the lower groove width. The fixed slider is a T-shaped slider 24, which is disposed in the stepped groove and fixed to the substrate by a number of fourth mounting screws 6. The upper width of the T-shaped slider 24 is smaller than the lower width. The upper part of the T-shaped slider 24 is located at the upper part of the stepped groove, and the lower part is located at the lower part of the stepped groove.

[0076] The clamping elastic element is a clamping spring 23, which is located between the inner wall of one end of the stepped slide groove and one end of the T-shaped slider 24 and is in a compressed state. Furthermore, one end of the T-shaped slider 24 is provided with a flat-bottomed hole 241, and one end of the clamping spring 23 is inserted into the flat-bottomed hole 241.

[0077] The movable clamping member 25 is fixed on the sliding member and located in the first receiving hole 132 and the second receiving hole 112. The movable clamping member 25 is driven by the elastic force of the clamping spring 23 to move toward the fixed clamping member 21 to clamp the CQFP component 4. The tension switching mechanism 3 drives the sliding member to overcome the elastic force of the clamping elastic member and move away from the fixed clamping member 21 to release the CQFP component 4.

[0078] Specifically, both the fixed clamping member 21 and the movable clamping member 25 are composed of two vertical plates arranged at an angle. In this embodiment, the two vertical plates are arranged at 90 degrees, and the fixed clamping member 21 and the movable clamping member 25 are diagonally arranged to clamp the adjacent sidewalls at opposite corners of the CQFP component 4. The angle between the two vertical plates matches the angle of the adjacent ends of the CQFP component 4, meaning that the angle of the adjacent ends of the CQFP component 4 is also 90 degrees. The fixed clamping member 21 and the movable clamping member 25 achieve diagonal clamping of the CQFP component 4. Furthermore, the fixed clamping member 21 and the movable clamping member 25 are respectively located at the diagonal corners of the first receiving hole 132 and the second receiving hole 112. The two vertical plates of the fixed clamping member 21 are respectively attached to the two adjacent inner walls of the first receiving hole 132 and the second receiving hole 112.

[0079] The upper surfaces of each vertical plate are of equal height and serve as bearing surfaces. The CQFP component 4 is placed on these bearing surfaces. A retaining edge is provided on the side of the bearing surface furthest from the CQFP component 4; this retaining edge is used to clamp the side wall of the CQFP component 4. (See also...) Figure 8The upper surfaces of the two vertical plates of the fixed clamping member 21 are first bearing surfaces 211, and the first bearing surfaces 211 have a first stop 212 on the side away from the CQFP component 4; the upper surfaces of the two vertical plates of the movable clamping member 25 are second bearing surfaces, and the second bearing surfaces have a second stop on the side away from the CQFP component 4. Furthermore, the first stop 212 is relatively long, increasing the clamping area on the adjacent sides of the CQFP component 4, fully satisfying the diagonal clamping requirement.

[0080] The tension switching mechanism 3 includes a switching slide bar 31, which is slidably connected to the lower end face of the substrate. Specifically, it includes at least two pressure blocks 32. In this embodiment, two pressure blocks 32 are provided. The pressure blocks 32 are fixed to the lower end face of the substrate by several fifth mounting screws 7. The upper end face of the pressure block 32 is provided with a sliding groove, and the switching slide bar 31 is slidably connected in the sliding groove. The switching slide bar 31 is set at a 90-degree angle to the sliding member, which is located above the switching slide bar 31. The lower end face of the sliding member facing the switching slide bar 31 is the forming surface, and the switching slide bar 31 is located below the forming surface and is limited by it. That is to say, the switching slide bar 31 slides in the sliding cavity formed by the forming surface and the sliding groove. A stepped slide groove and a T-shaped slider 24 are provided at the end of the sliding member away from the switching slide bar 31.

[0081] Furthermore, at least one stop post 312 is provided on the upper end surface of the switching slide bar 31. In this embodiment, a stop post 312 is provided on the upper end surface of each end of the switching slide bar 31. A limiting groove 113 corresponding to the stop post 312 is provided on the substrate along the sliding direction of the switching slide bar 31. The stop post 312 is provided in the limiting groove 113. The stop post 312 and the limiting groove 113 cooperate to limit the sliding stroke of the switching slide bar 31 and prevent the switching slide bar 31 from overtraveling and falling off.

[0082] One side wall of the switching slide bar 31 is opposite to one end of the slider and is used to drive the slider to slide. One end of the switching slide bar 31 is the loose end and the other end is the tight end. The width of the loose end is greater than that of the tight end, and the width of the loose end gradually decreases to transition to the tight end. Specifically, the transition can be achieved through the inclined surface 311 or the arc surface.

[0083] Preferably, a stop shaft is provided on the lower end face of the slider near the end of the switching slide bar 31, and one side wall of the switching slide bar 31 is opposite to the stop shaft, and the slider is pushed to slide by abutting against the stop shaft.

[0084] When the switching slider 31 slides to the point where the loose end is opposite to the stop shaft, the side wall of the loose end abuts against the stop shaft and pushes the slider away from the fixed clamp 21 to move the movable clamp 25 away from the fixed clamp 21 to release the CQFP component 4.

[0085] When the switching slider 31 slides to the tight end and faces the stop shaft, since the width of the tight end becomes smaller, it does not contact the stop shaft. The slider is driven by the elastic force of the clamping spring 23 to slide towards the fixed clamping member 21, so as to drive the movable clamping member 25 to move towards the fixed clamping member 21 to clamp the CQFP component 4.

[0086] Further, the upper surface of the end of the switching slider 31 far from the loose end at the tight end is engraved with the word "loose", and the upper surface of the end of the switching slider 31 far from the tight end at the loose end is engraved with the word "tight". When the switching slider 31 slides to make the side wall of the loose end abut against the stop shaft, the end of the tight end far from the loose end extends out of one side of the substrate, showing the word "loose", to prompt the operator that the movable clamping member 25 has released the CQFP component 4; when the switching slider 31 slides to make the side wall of the tight end abut against the stop shaft, the end of the loose end far from the tight end extends out of one side of the substrate, showing the word "tight", to prompt the operator that the movable clamping member 25 has clamped the CQFP component 4.

[0087] The fixture of the present invention includes two working states: the initial relaxation state and the clamping state. For the initial relaxation state, refer to FIGS. 13 to 15. The extreme position of one end of the switching slider 31 shows the engraved word "loose", the stop shaft abuts against the side wall of the wide end of the switching slider 31, and the clamping spring 23 is in the extreme compression state. At this time, refer to Figure 12 、 13 , the pin stand height of the CQFP component 4 is L1, and the distance between the opposing stop edges of the fixed clamping member 21 and the movable clamping member 25 is L. It is required that L2 < L < L2 + 2*L3 - 2d, where d is the thickness of the stop edge, L2 is the body size of the CQFP component 4, and L3 is the shoulder width size of the CQFP component 4 after forming. The value of L should ensure that the CQFP component 4 can be easily placed between the fixed clamping member 21 and the movable clamping member 25, and the fixed clamping member 21 and the movable clamping member 25 do not interfere with the pins of the CQFP component 4.

[0088] After the CQFP component 4 is placed, manually slide the switching slider 31 to the extreme position at the other end, refer to Figures 16 to 18 . During this process, the stop shaft slides along the inclined surface 311 of the side wall of the switching slider 31 until it disengages from the side wall of the switching slider 31. Since the stop shaft is no longer restricted, the elastic force of the clamping spring 23 is released and it elongates. The movable clamping member 25 moves along the T-shaped slider 24 towards the fixed clamping member 21 under the action of the elastic force until it cooperates with the fixed clamping member 21 to clamp the CQFP component 4. At this time, it is in the clamping state, and the switching slider 31 shows the identification word "tight". The transitional design of the inclined surfaces 311 at both the wide and narrow ends of the switching slider 31 can make the clamping process of the CQFP component 4 gradually receive force, avoiding potential quality hazards caused by excessive impact force to the CQFP component 4.

[0089] The working process of the present invention is further described below:

[0090] 1. First, adjust the height of the fixture printed circuit board 13 by adjusting screw 131. According to the pin height dimension L1 of CQFP component 4, adjust the height of the fixture printed circuit board 13 so that the distance between the bottom plane of the pin of CQFP component 4 and the upper surface of the fixture printed circuit board 13 is within the range of 0.2mm to 0.3mm, which makes it easy to use tools to correct the offset and warping of the pin of CQFP component 4.

[0091] 2. Confirm that the clamp is in the initial relaxed working state. Switch the slide bar 31 to the extreme position at one end, revealing the engraved word "relaxed".

[0092] 3. Place the CQFP component 4. Place the CQFP component 4 on the first bearing surface 211 and the second bearing surface of the fixed clamp 21 and the movable clamp 25.

[0093] 4. Clamp the CQFP component 4. Push the switching slide bar 31 to its extreme position at the other end. At this time, the four sides of the movable clamping member 25 and the fixed clamping member 21 clamp the four sides of the CQFP component 4, thereby clamping the CQFP component 4. The word "tight" is then visible on the switching slide bar 31.

[0094] 5. Trim the 4-pin of the CQFP component. Refer to the process pad position on the printed circuit board 13 of the tooling and use tools to trim any warped or offset pins.

[0095] 6. Loosen CQFP component 4. Slide the switching lever 31 to bring the flower cutting lever to the extreme position at the other end, so that the fixture is in the initial loosened state, revealing the engraved word "Loose". Use a vacuum pen to remove CQFP component 4.

[0096] This invention allows for manual switching between the initial and clamping states of the fixture by setting the limit position of the sliding lever 31. The operation is simple, fast, and accurate. The clamping spring 23 releases its force to push the movable clamping member 25, achieving constant clamping force on the CQFP component 4. The four sides and bottom of the CQFP component 4 are selected as the clamping and placement surfaces, resulting in a large clamping area. The two sides of the T-shaped slider 24 that mate with the sliding member have dimensional allowances, allowing the sliding member to rotate slightly. This ensures that the movable clamping member 25 adapts to the shape of the CQFP component 4, resulting in high clamping reliability. Markings are engraved at both ends of the switching lever 31 for intuitive judgment of the tightness state.

[0097] The present invention has a simple overall structure, is easy to use, has high operating efficiency, saves effort, has low cost, and provides stable clamping quality. It adopts a simple and efficient method to quickly position and clamp CQFP components 4, which can quickly correct the warped or offset pins of CQFP components 4 after forming. Its superiority is even more evident when correcting the pins of CQFP components 4.

[0098] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A CQFP component lead trimming fixture, characterized in that, It includes a base, a pin position reference, and a height adjustment mechanism, a clamping mechanism, and a tension switching mechanism disposed on the base, wherein the reference is disposed on the height adjustment mechanism; The clamping mechanism is used to clamp and position the component, and the tension switching mechanism is used to drive the clamping mechanism to clamp or loosen the component. The pin position reference component is provided with a plurality of pin reference positions, which are used to provide a reference position when trimming the pins on the component; When trimming the pin, the height of the pin position reference is adjusted by the height adjustment mechanism to adjust the distance between the pin reference position and the pin to a preset distance; The pin position reference component has a first receiving hole in the middle, the clamping mechanism is disposed in the first receiving hole, and the pin reference position is disposed on the upper end surface of the pin position reference component on the periphery. The clamping mechanism includes a fixed clamping member, a movable clamping member, a sliding member, a fixed slider, and a clamping elastic member. The base is provided with a second receiving hole corresponding to the first receiving hole. The fixing clamp is located in the first receiving hole and the second receiving hole, and the fixing clamp is fixed to the lower end face of the base by a mounting flange; The fixed slider is fixed to the lower end face of the base, the sliding member is located on the lower end face of the base and passes below the second receiving hole, and the sliding member is slidably connected to the fixed slider; the clamping elastic member is disposed between the sliding member and the fixed slider, and the clamping elastic member applies an elastic force to the sliding member toward the fixed clamping member; The movable clamping member is fixed on the sliding member and located within the first receiving hole and the second receiving hole; The movable clamping member is driven by the elastic force of the clamping elastic member to move toward the fixed clamping member to clamp the component, and the tension switching mechanism drives the sliding member to overcome the elastic force of the clamping elastic member and move away from the fixed clamping member to release the component.

2. The CQFP component lead trimming fixture according to claim 1, characterized in that, The pin position reference is a tooling printed circuit board, and the pin reference position is a process pad on the tooling printed circuit board. The tooling printed circuit board is made of a printed circuit board used to mount the component.

3. The CQFP component lead trimming fixture according to claim 1, characterized in that, The height adjustment mechanism includes several adjusting screws and several adjusting springs, with the adjusting springs sleeved on the adjusting screws; The pin position reference component is provided with a plurality of mounting holes, and the base is provided with a plurality of mounting screw holes in a number and position corresponding one-to-one with the mounting holes; The adjusting screw passes through the mounting hole and is threaded into the mounting screw hole. The adjusting spring is located between the base and the pin position reference and is in a compressed state.

4. The CQFP component lead trimming fixture according to claim 3, characterized in that, The upper surface of the base is provided with a number of bosses that correspond one-to-one with the mounting holes. Each boss is provided with a stepped hole coaxial with the mounting hole. The mounting screw hole is located at the lower part of the stepped hole. The upper part of the stepped hole is a smooth hole with a diameter larger than that of the mounting screw hole. The adjusting spring is located in the smooth hole.

5. The CQFP component lead trimming fixture according to claim 3, characterized in that, It includes a barrier assembly disposed on the periphery of the pin position reference member, used to limit the pin position reference member to prevent it from tilting when it moves up and down.

6. The CQFP component lead trimming fixture according to claim 5, characterized in that, The enclosure assembly includes four baffles, which are respectively disposed around the pin position reference member; The baffle is provided with adjusting oblong holes at at least at both ends. A first mounting screw passes through the adjusting oblong holes and is threaded to the base to install the baffle on the base. The gap between the baffle and the pin position reference can be adjusted through the adjusting oblong holes.

7. The CQFP component lead trimming fixture according to claim 1, characterized in that, Both the fixed clamp and the movable clamp are composed of two vertical plates arranged at an angle, and the fixed clamp and the movable clamp are diagonally arranged to clamp the adjacent sidewalls at opposite ends of the component. The angle between the two vertical plates matches the angle of the adjacent ends of the component. The upper surfaces of each of the vertical plates are of equal height and serve as bearing surfaces. The components are placed on the bearing surfaces, and a retaining edge is provided on the side of the bearing surface away from the components. The retaining edge is used to clamp the side wall of the components.

8. The CQFP component lead trimming fixture according to claim 1, characterized in that, The sliding member is provided with a stepped groove, the upper groove width of the stepped groove is smaller than the lower groove width, the fixed slider is a T-shaped slider, the T-shaped slider is disposed in the stepped groove, and the upper width of the T-shaped slider is smaller than the lower width, the upper part of the T-shaped slider is disposed in the upper part of the stepped groove, and the lower part is disposed in the lower part of the stepped groove; The clamping elastic element is a clamping spring, which is located between the inner wall of one end of the stepped slide groove and one end of the T-shaped slider and is in a compressed state.

9. The CQFP component lead trimming fixture according to claim 1, characterized in that, The tension switching mechanism includes a switching slide bar, which is slidably connected to the lower end face of the base; One side wall of the switching slide bar is opposite to one end of the sliding member and is used to drive the sliding member to slide. One end of the switching slide bar is a loose end and the other end is a tight end. The width of the loose end is greater than that of the tight end, and the width of the loose end gradually decreases to transition to the tight end. When the switching slider slides to the point where the loose end is opposite to the sliding member, the side wall of the loose end abuts against the sliding member and pushes the sliding member away from the fixed clamping member, thereby causing the movable clamping member to move away from the fixed clamping member and release the component. When the switching slide bar slides to the tight end opposite the sliding member, the sliding member is driven to slide toward the fixed clamping member by the elastic force of the clamping elastic member, so as to drive the movable clamping member to move toward the fixed clamping member to clamp the component.

10. The CQFP component lead trimming fixture according to claim 9, characterized in that, One end of the slider is provided with a stop shaft, and one side wall of the switching slide rod is opposite to the stop shaft, and pushes the slider to slide by abutting against the stop shaft.

11. The CQFP component lead trimming fixture according to claim 9, characterized in that, It includes at least two pressure blocks, which are fixed to the lower end face of the base. The upper end face of the pressure block is provided with a sliding groove, and the switching slide rod is slidably connected in the sliding groove.

12. The CQFP component lead trimming fixture according to claim 9, characterized in that, The upper end face of the switching slide bar is provided with at least one stop post, and the base is provided with at least one limiting groove along the sliding direction of the switching slide bar. The stop post is located in the limiting groove, and the stop post and the limiting groove cooperate to limit the sliding stroke of the switching slide bar.

13. The CQFP component lead trimming fixture according to claim 1, characterized in that, The base includes a substrate and an outer cover. The outer cover is fixed to the lower end face of the substrate. The height adjustment mechanism is located on the upper end face of the substrate. The clamping mechanism and the tension switching mechanism are both located on the lower end face of the substrate and inside the outer cover. The upper end of the clamping mechanism extends to the upper end face of the substrate.

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