A pre-assembled clamp

Abstract

The application discloses a pre-assembly clamp which comprises a fixed bottom plate, a screwdriver head mounting seat, a movable positioning plate, lifting guide columns, lifting limiting seats, return springs, screw positioning holes, profiling positioning grooves and a material stripping assembly. In the pre-assembly clamp, the screw back-off mode is adopted to solve the problems that PCB holes are difficult to align and products are not locked due to screw deviation, improve the assembly accuracy and yield, and the material stripping assembly is used to help the products to be quickly stripped, thereby improving the work efficiency.

Description

Technical Field

[0001] This invention relates to the field of PCBA assembly technology, and in particular to a pre-assembly fixture. Background Technology

[0002] Currently, during PCBA component pre-assembly, the fixture design is centered around the PCB mounting holes. The fixture cavity is divided into three parts: the first part is the bottom layer of the cavity where nuts are placed; the second part is the middle layer of the cavity where components are placed, with the mounting holes aligned with the center of the nuts; and the third part is the top layer of the cavity where the PCB is placed, with the component mounting holes aligned with the center of the nuts. Finally, screws are placed and an automatic screwdriver is used to complete the assembly.

[0003] However, this operation still has the following problems:

[0004] a. Because the leads of transistor components are pre-shaped, they may be bent, so the above-mentioned inverted method makes it difficult to align the PCB holes.

[0005] b. Screw misalignment: When using an electric screwdriver, the components and nuts inside the PCB are not visible, and the tolerances of the components also affect the assembly accuracy to some extent. Summary of the Invention

[0006] The main technical problem solved by this invention is to provide a pre-assembly fixture with advantages such as high reliability, accurate positioning and compact structure, and has broad market prospects in PCBA assembly application and popularization.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A pre-assembled fixture is provided, comprising: a fixed base plate, a screwdriver bit mounting seat, a movable positioning plate, a lifting guide column, a lifting limit seat, a return spring, a screw positioning hole, a contour positioning groove, and a stripping assembly.

[0009] The movable positioning plate is provided with contour positioning grooves for positioning PCBs and components, and screw positioning holes for positioning screws. The screwdriver bit mounting base is disposed on the fixed base plate to mount screwdriver bits for fixing screws, and to position the screwdriver bits directly below the screw positioning holes.

[0010] The lower end of the lifting guide column is connected to the fixed base plate, and the upper end of the guide column is connected to the lifting limit seat. The movable positioning plate is movably connected to the lifting guide column, and one end of the return spring is connected to the movable positioning plate, while the other end is connected to the lifting limit seat. This allows the movable positioning plate to be raised along the lifting guide column or reset by the return spring.

[0011] The unloading assembly includes a snap fastener, a cam mounting base, and a lifting cam. The cam mounting base is disposed on the fixed base plate, and the lifting cam is rotatably disposed on the cam mounting base. The snap fastener is connected to the lifting cam to drive the lifting cam to rotate on the cam mounting base, thereby lifting or lowering the movable positioning plate.

[0012] In a preferred embodiment of the present invention, the contour positioning groove includes a groove A for placing a positioning PCB and a groove B for placing positioning components.

[0013] In a preferred embodiment of the present invention, the screw positioning hole is disposed in the groove A.

[0014] In a preferred embodiment of the present invention, limiting blocks are provided around the perimeter of the groove A.

[0015] In a preferred embodiment of the present invention, the movable positioning plate is provided with a bushing that is slidably connected to the lifting guide column.

[0016] In a preferred embodiment of the present invention, the movable positioning plate is provided with a clearance opening for easy access to the product.

[0017] In a preferred embodiment of the present invention, the lifting cam and the buckle are an integral structure.

[0018] The beneficial effects of this invention are: by using a screw-back method, the problems of PCB hole misalignment and product incomplete locking due to misaligned screws are solved, thereby improving assembly accuracy and yield. Furthermore, the use of a stripping component helps the product to be quickly demolded, thus improving work efficiency. Attached Figure Description

[0019] 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 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, wherein:

[0020] Figure 1 This is a schematic diagram of a preferred embodiment of a pre-assembled fixture according to the present invention;

[0021] Figure 2 This is a side view of a preferred embodiment of a pre-assembled fixture according to the present invention;

[0022] Figure 3 This is a top view schematic diagram of a preferred embodiment of a pre-assembled fixture of the present invention. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-3 The embodiments of the present invention include:

[0025] A pre-assembled fixture includes: a fixed base plate 1, a screwdriver head mounting seat 2, a movable positioning plate 3, a lifting guide column 4, a lifting limit seat 5, a return spring 6, a screw positioning hole 7, a contour positioning groove, and a stripping assembly.

[0026] The movable positioning plate is provided with contoured positioning grooves for placing PCBs and components, and screw positioning holes for placing fixing screws 16. Multiple screwdriver bit mounting seats are disposed on the fixed base plate for mounting screwdriver bits 8, such that the screwdriver bits are positioned directly below the screw positioning holes.

[0027] More preferably, the contour positioning groove includes a groove A9 for placing the positioning PCB and a groove B10 for placing the positioning components.

[0028] More preferably, the screw positioning hole is disposed within the groove A.

[0029] More preferably, the groove A is surrounded by limiting blocks 11.

[0030] In a further preferred embodiment, the screwdriver bit mounting base can be detachably connected to the screwdriver bit via a snap-fit ​​or interference fit.

[0031] The lower end of the lifting guide column is connected to the fixed base plate, and the upper end is connected to the lifting limit seat. The movable positioning plate is movably connected to the lifting guide column, and one end of the return spring is connected to the movable positioning plate, while the other end is connected to the lifting limit seat, allowing the movable positioning plate to descend or rise along the lifting guide column to reset. A material ejection assembly is movably mounted on the movable positioning plate to eject the product from the contour positioning groove, improving the efficiency, accuracy, and stability of the material ejection process.

[0032] More preferably, the movable positioning plate is provided with a bushing that is slidably connected to the lifting guide column to improve the smoothness and stability of the lifting of the movable positioning plate.

[0033] More preferably, the movable positioning plate is provided with a clearance opening 12 for easy access to the assembled product.

[0034] More preferably, the unloading assembly includes a snap fastener 13, a cam mounting base 14, and a lifting cam 15. The cam mounting base is disposed on the fixed base plate, and the lifting cam is rotatably disposed on the cam mounting base via a rotating shaft. The snap fastener is connected to the lifting cam.

[0035] More preferably, the lifting cam and the buckle are an integral structure.

[0036] The workflow of a pre-assembled fixture includes:

[0037] (1) Install the Phillips screwdriver bit on the screwdriver bit mounting base, and use the screwdriver bit as the bottom assembly limit post;

[0038] (2) Place the screw in reverse in the screw positioning hole so that the screw nut and the cross-head screwdriver head are tightly locked together;

[0039] (3) First, place the PCB in the slot A, and then place the components one by one in the slot B for positioning. This solves the problem of difficulty in aligning PCB holes due to the current inverted buckling method.

[0040] (4) The nut is installed onto the fixed screw by using an electric screw socket, which solves the problem of loosening caused by misaligned screws in the prior art;

[0041] (5) Since it is difficult to remove the plate after multiple screws are locked and assembled, the fixture is designed with a material removal component. So when the product is assembled, you only need to press the protruding buckles on both sides with both hands. The lifting cam at the inner end of the buckle will rotate and lift the movable positioning plate upward, so that the screws on the product 17 are removed from the screwdriver head. Finally, manual or automated equipment can remove the product from the movable positioning plate through the clearance, which improves work efficiency.

[0042] (6) After the product is removed, lift the buckle and the lifting cam rotates downward, so that the movable positioning plate descends and resets to the initial position under the action of the reset spring.

[0043] The beneficial effects of the pre-assembled fixture of the present invention are:

[0044] 1. By using a reverse screw method, the problem of component misalignment with PCB holes due to tolerance issues is solved, avoiding the product not being tightened due to misaligned screws, thus improving assembly accuracy;

[0045] 2. With the unloading component, the PCB can be automatically detached by simply pressing the clips on both sides, which effectively improves work efficiency.

[0046] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A pre-assembled fixture, characterized in that, include: Fixed base plate, screwdriver bit mounting base, movable positioning plate, lifting guide column, lifting limit seat, return spring, screw positioning hole, contour positioning groove, and stripping assembly. The movable positioning plate is provided with contour positioning grooves for positioning PCBs and components, and screw positioning holes for positioning screws. The screwdriver bit mounting base is disposed on the fixed base plate to mount screwdriver bits for fixing screws, and to position the screwdriver bits directly below the screw positioning holes. The lower end of the lifting guide column is connected to the fixed base plate, and the upper end of the guide column is connected to the lifting limit seat. The movable positioning plate is movably connected to the lifting guide column, and one end of the return spring is connected to the movable positioning plate, while the other end is connected to the lifting limit seat. This allows the movable positioning plate to be raised along the lifting guide column or reset by the return spring. The unloading assembly includes a snap fastener, a cam mounting base, and a lifting cam. The cam mounting base is disposed on the fixed base plate, and the lifting cam is rotatably disposed on the cam mounting base. The snap fastener is connected to the lifting cam to drive the lifting cam to rotate on the cam mounting base, thereby lifting or lowering the movable positioning plate. The contour positioning groove includes a groove A for placing the positioning PCB and a groove B for placing the positioning components. The screw positioning hole is disposed in the groove A, and limit blocks are provided around the groove A.

2. The pre-assembled fixture according to claim 1, characterized in that, The movable positioning plate is provided with a bushing that is slidably connected to the lifting guide column.

3. A pre-assembled fixture according to claim 1, characterized in that, The movable positioning plate is provided with a clearance opening for easy access to the product.

4. A pre-assembled fixture according to claim 1, characterized in that, The lifting cam and the buckle are an integral structure.

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