FPC board bending test fixture

Abstract

The utility model provides a kind of FPC board bending test fixture, it is related to FPC board detection technical field, including bottom plate, the bottom plate is provided with three parallel grooves along length direction, the groove in middle is work groove, the groove in work groove both sides is limit groove;The inner wall both sides of the work groove are provided with sliding groove;Two-way screw rod, is installed in the work groove, is rotated by two-way driving motor drive two-way screw rod, screw rod outer end coarse thread rib drives sliding assembly relative movement along limit groove, inboard fine thread rib synchronously drives adjusting assembly close, adjusting assembly moves and jacks up pre-ram, so that the FPC board clamped by clamping assembly is bent according to preset direction;Barrier ring avoids the collision of sliding assembly and adjusting assembly, spring ensures that adjusting assembly is always attached fine thread rib, when screw rod reverses, pre-ram gravity cooperates spring elasticity, adjusting assembly is pushed back to initial position, sliding assembly is reset synchronously, completes once FPC board bending test cycle.

Description

Technical Field

[0001] This utility model relates to the field of bushing technology, and in particular to an FPC board bending test fixture. Background Technology

[0002] Flexible printed circuit boards (FPCs) are widely used in electronic products such as mobile phones and smart wearable devices due to their flexibility and foldability. Their bending performance directly determines the product's lifespan, so bending tests need to be carried out using special fixtures during production.

[0003] However, existing FPC board bending test fixtures lack a pre-defined bending direction structure, making it easy for FPC boards to deform irregularly when bent, and thus unable to simulate the fixed bending path in actual use scenarios. Therefore, an FPC board bending test fixture is needed. Utility Model Content

[0004] The purpose of this invention is to provide an FPC board bending test fixture, which solves the problem that the bending direction cannot be determined in the existing technology during the bending process.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an FPC board bending test fixture, including a base plate, wherein the base plate has three parallel grooves along its length, wherein the groove in the middle is a working groove, and the grooves on both sides of the working groove are limiting grooves; sliding grooves are provided on both sides of the inner wall of the working groove.

[0006] A bidirectional screw is installed in the working groove. The outer end of the bidirectional screw is provided with a set of opposing first threaded ribs, and the inner side of the bidirectional screw is provided with a set of opposing second threaded ribs. A blocking ring is provided between the first threaded ribs and the second threaded ribs. A spring is fixedly connected to the side of the blocking ring near the second threaded rib.

[0007] Two sets of sliding components are disposed opposite to each other on the base plate. The bottom of the sliding component is provided with a sliding block that matches the limiting groove. The bottom of the sliding component is provided with a working block. The working block is provided with a threaded groove that matches the first threaded rib of the bidirectional screw, and the working block matches the sliding groove.

[0008] Two sets of adjustment components are arranged opposite to each other inside the sliding component. The adjustment components match the groove, and the side of the adjustment component near the blocking ring abuts against the end of the spring away from the blocking ring. The adjustment component has an internal thread that matches the second threaded rib.

[0009] A pre-pushing rod is rotatably disposed between the two sets of the aforementioned adjustment components;

[0010] Two sets of clamping components are rotatably mounted above the two sets of sliding components for clamping the FPC board;

[0011] A bidirectional drive motor is fixedly mounted on one side of the base plate, and the output end of the bidirectional drive motor is connected to the bidirectional screw to drive the bidirectional screw to rotate.

[0012] Preferably, the barrier ring and the bidirectional screw are an integrated structure or fixed with an interference fit, and the outer diameter of the barrier ring is adapted to the width of the working groove.

[0013] Preferably, the spring is a compression spring, the axis of the spring is parallel to the axis of the bidirectional screw, and the free length of the spring is equal to the distance between the barrier ring and the second threaded rib.

[0014] Preferably, the sliding block and the limiting groove are fitted with a clearance fit, and the cross-sectional shape of the sliding block is consistent with the cross-sectional shape of the limiting groove.

[0015] Preferably, the two ends of the bidirectional screw are rotatably connected to the inner wall of the working groove via bearings, and the bearings are embedded in the preset mounting holes on the inner wall at both ends of the working groove.

[0016] Preferably, the clamping assembly includes a clamping frame, a support plate, a stabilizing rod, a clamping plate, and a threaded rotating rod. The two ends of the support plate are fixedly connected to the two sides of the inner wall of the clamping frame. The stabilizing rod passes through the support plate and is fixedly connected to the clamping plate located below the support plate. The threaded rotating rod, which is rotatably connected to the top center of the clamping plate, is helically connected to the support plate.

[0017] Preferably, the two ends of the pre-pushing rod are rotatably connected to the adjusting assembly via a rotating shaft, and the adjusting assembly has a rotating shaft hole that matches the rotating shaft.

[0018] Preferably, the adjustment assembly includes a push ring and a connecting rod. The push ring has sliders on both sides that match the limiting grooves. The push ring is rotatably connected to the pre-pushing rod through the connecting rod.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] A bidirectional drive motor drives a bidirectional screw to rotate. The coarse threaded rib at the outer end of the screw causes the sliding component to move relative to the limiting groove, while the fine threaded rib on the inner side simultaneously causes the adjusting component to move closer. When the adjusting component moves, it lifts the pre-push rod, causing the FPC board held by the clamping component to bend in a preset direction. The isolation ring prevents the sliding component from colliding with the adjusting component, and the spring ensures that the adjusting component always fits against the fine threaded rib. When the screw reverses, the gravity of the pre-push rod, combined with the spring force, pushes the adjusting component back to its initial position, and the sliding component resets simultaneously, completing one FPC board bending test cycle. Attached Figure Description

[0021] Figure 1 This is a top view of the overall structure of the product of this utility model;

[0022] Figure 2 This is a schematic cross-sectional view of the base plate of the product of this utility model;

[0023] Figure 3 This is a schematic diagram of the sliding component structure of the product of this utility model;

[0024] Figure 4 This is a schematic diagram of the clamping component structure of the product of this utility model;

[0025] Figure 5 This is a schematic diagram of the bidirectional screw structure of the product of this utility model.

[0026] In the diagram: 1. Base plate; 11. Working groove; 12. Limiting groove; 13. Sliding groove; 2. Bidirectional screw; 21. First threaded rib; 22. Second threaded rib; 23. Barrier ring; 24. Spring; 3. Sliding assembly; 31. Sliding block; 32. Working block; 4. Adjusting assembly; 41. Push ring; 42. Connecting rod; 5. Pre-push rod; 6. Clamping assembly; 61. Clamping frame; 62. Support plate; 63. Stabilizing rod; 64. Clamping plate; 65. Threaded rotating rod; 7. Drive motor. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] This utility model relates to an FPC board bending test fixture, such as Figure 1-5 As shown, the base plate 1 is made of hard alloy and is placed horizontally on the test platform. Three parallel rectangular slots are opened along the length direction. The middle working slot 11 is located at the center line of the base plate 1. The two ends of the slot are provided with mounting holes for assembling bearings. The overall size is adapted to the installation requirements of the bidirectional screw 2. The limiting slots 12 on both sides are symmetrically distributed on both sides of the working slot 11. The slots are T-shaped and are used to constrain the movement direction of the sliding component 3 to avoid deviation. The inner walls of the working slot 11 are provided with sliding slots 13 along the length direction, which are connected to and parallel to the working slot 11 and are used to cooperate with the working block 32 of the sliding component 3 to achieve stable sliding.

[0029] Furthermore, the bidirectional screw 2 is made of stainless steel and is horizontally installed in the working groove 11, with its axis coinciding with the length direction of the working groove 11.

[0030] The outer end first threaded rib 21 is located at both ends of the screw, with two sets of threads in opposite directions, used to drive the relative movement of the sliding component 3.

[0031] The inner second threaded rib 22 is located in the middle of the screw. The two sets of threads have opposite directions and are used to drive the adjustment component 4 to move relative to each other.

[0032] Barrier ring 23: Located between the first threaded rib 21 and the second threaded rib 22, it is a carbide ring structure with dimensions adapted to the working groove 11 and coaxial with the screw.

[0033] Spring 24: A compression spring made of spring steel, one end of which is fixed to the side of the blocking ring 23 near the second threaded rib 22, and the other end extends to the direction of the second threaded rib 22 to abut against the adjusting component 4.

[0034] Furthermore, two sets of sliding components 3 are symmetrically arranged on the base plate 1, located above the limiting grooves 12 on both sides of the working groove 11, and adopt a hard alloy block structure:

[0035] Bottom sliding block 31: integrally formed on both sides of the bottom of the sliding component 3, with a T-shaped structure, which perfectly matches the T-shaped groove of the limiting groove 12, and can slide along the length direction of the limiting groove 12 after being embedded;

[0036] Bottom working block 32: integrally formed at the bottom centerline of the sliding component 3, embedded in the sliding groove 13 of the working groove 11, and provided with a threaded groove that matches the first threaded rib 21. When the bidirectional screw 2 rotates, the working block 32 drives the sliding component 3 to move smoothly along the limiting groove 12.

[0037] Furthermore, the two sets of adjustment components 4 are symmetrically arranged inside the sliding component 3 near the center line of the working groove 11, and are located within the working groove 11:

[0038] The main body of the adjusting component 4 matches the groove 14 on the inner wall of the working groove 11 and can slide along the groove 14;

[0039] The side of the adjusting component 4 closest to the blocking ring 23 abuts against the end of the spring 24 furthest from the blocking ring 23. Initially, the spring is uncompressed and has an internal thread adapted to the second threaded rib 22. When the bidirectional screw 2 rotates, the adjusting component 4 can move along the second threaded rib 22. The spring 24 always applies a spring force towards the second threaded rib 22. Both sides of the second threaded rib 22 have blank areas. When the adjusting component 4 approaches the blocking ring 23, the spring 24 abuts against one side of the adjusting component 4. When the adjusting component 4 reaches its end, it is precisely located in the blank area. The spring 24 ensures that the adjusting component 4 is in contact with the second threaded rib 22, allowing it to move away from the blocking ring 23 at any time via the bidirectional screw 2, thus moving its threaded connection. When it reaches the end, it is still in the blank area on the other side. The bidirectional screw 2 will also abut against one side of the adjusting component 4, without affecting the position of the adjusting component. The adjusting component is rotatably connected to a pre-push rod 5. Due to gravity, there will be a force that moves towards the blocking ring. When the bidirectional screw 2 rotates, a spiral connection can occur, which serves to drive the adjusting component 4 to move.

[0040] Furthermore, the pre-jacking rod 5 is made of stainless steel and is horizontally positioned between the two sets of adjusting components 4.

[0041] The two ends of the pre-push rod 5 are rotatably connected to the adjustment component 4 through a rotating shaft. The rotating shaft and the pre-push rod 5 are integrally formed. The pre-push rod 5 can move synchronously with the adjustment component 4 and can rotate freely around the rotating shaft. When the adjustment component 4 moves closer to the center line, the pre-push rod 5 is lifted up, guiding the bending direction of the FPC board.

[0042] Among them, such as Figure 5 As shown, the push ring 41 is a hard alloy ring structure, located in the working groove 11 and coaxial with the bidirectional screw 2, and the inner hole is provided with an internal thread that matches the second threaded rib 22;

[0043] Slider: It is integrally formed on both outer walls of the push ring 41, and has a T-shaped structure that matches the T-shaped groove of the limiting groove 12. It can slide along the limiting groove 12.

[0044] Connecting rod 42: The push ring 41 is rotatably connected to the pre-push rod 5 through the connecting rod 42. When the two sets of connecting rods come together, the pre-push rod 5 will rise, and vice versa.

[0045] Furthermore, the two sets of clamping components 6 are rotatably connected to the top of the two sets of sliding components 3 via bearings, and are located directly above the sliding components 3, for clamping the FPC board to be tested:

[0046] The clamping component 6 can rotate within the sliding component 3 to accommodate the angle changes during the bending process of the FPC board and prevent the FPC board from being subjected to additional tensile force.

[0047] Among them, such as Figure 4As shown, the clamping frame 61 is a U-shaped hard alloy structure, which is rotatably connected to the top of the sliding assembly 3 by bolts, with the U-shaped opening facing upwards; the support plate 62 is a metal plate, fixed to both sides of the inner wall of the clamping frame 61, and horizontally set to support the stabilizing rod 63 and the threaded rotating rod 65; the stabilizing rod 63 is a metal cylindrical rod, symmetrically distributed on both sides of the support plate 62, passing through the support plate 62 and fixed to the clamping plate 64 below; the clamping plate 64 is a nylon plate with a rubber anti-slip layer pasted on the inside, horizontally set below the support plate 62, and can move up and down with the stabilizing rod 63; the threaded rotating rod 65 is a metal screw, passing through the central threaded hole of the support plate 62, and its lower end is rotatably connected to the clamping plate 64. When the threaded rotating rod 65 is rotated, it drives the clamping plate 64 to move up and down along the stabilizing rod 63.

[0048] Furthermore, the bidirectional drive motor 7 is fixed to one end of the base plate 1 near the end of the working groove 11 via a bracket:

[0049] The motor output end is coaxially connected to one end of the bidirectional screw 2 via a coupling. When powered on, it can drive the bidirectional screw 2 to rotate clockwise or counterclockwise, thereby driving the sliding component 3 and the adjusting component 4 to move synchronously.

[0050] Preferably, the barrier ring 23 and the bidirectional screw 2 are fixed in two optional ways:

[0051] Integrated structure: It is formed in one piece by CNC machining, with consistent materials, ensuring minimal coaxiality error, no assembly gap, and preventing the isolation ring 23 from shifting with the screw rotation;

[0052] Interference fit fixing: The inner hole of the barrier ring 23 and the corresponding position of the screw are fitted with an interference fit and assembled by cold pressing process to ensure that the two are tightly connected and there is no relative slippage when rotating.

[0053] The outer diameter of the barrier ring 23 is perfectly matched with the width of the working groove 11, which not only prevents the barrier ring 23 from shaking, but also prevents the screw from getting stuck. At the same time, it can prevent the working block 32 of the sliding component 3 from moving towards the second threaded rib 22, thus preventing the sliding component 3 from colliding with the adjusting component 4.

[0054] Furthermore, spring 24 is a cylindrical compression spring made of spring steel, and its axis is completely parallel to the axis of the double-acting screw 2.

[0055] Furthermore, the sliding block 31 and the limiting groove 12 are fitted with a clearance, which can ensure that the sliding block 31 slides smoothly along the limiting groove 12 without jamming, and can also limit the offset of the sliding component 3 in the width direction, ensuring the precise clamping position of the FPC board.

[0056] Furthermore, both the sliding block 31 and the limiting groove 12 have T-shaped cross-sections and the same structural parameters. The T-shaped structure can prevent the sliding component 3 from moving vertically, ensure the height stability of the clamping component 6, and avoid vertical displacement during the bending of the FPC board.

[0057] In practical use: the bidirectional drive motor 7 drives the bidirectional screw 2 to rotate. The coarse thread rib 21 at the outer end of the screw drives the sliding component 3 to move relative to the limiting groove 12. The fine thread rib 22 on the inner side drives the adjusting component 4 to move closer. When the adjusting component 4 moves, it lifts the pre-lift rod 5, causing the FPC board held by the clamping component 6 to bend in the preset direction. The blocking ring 23 prevents the sliding component 3 from colliding with the adjusting component 4. The spring 24 ensures that the adjusting component 4 always fits against the fine thread rib 22. When the screw reverses, the gravity of the pre-lift rod 5, combined with the elasticity of the spring 24, pushes the adjusting component 4 back to the initial position. The sliding component 3 resets synchronously, completing one FPC board bending test cycle.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bending test fixture for FPC boards, characterized in that: Includes a base plate (1), which has three parallel grooves along its length, wherein the middle groove is a working groove (11) and the grooves on both sides of the working groove (11) are limiting grooves (12); the inner walls of the working groove (11) are provided with sliding grooves (13) and the inner walls of the working groove (11) are also provided with recesses (14). A bidirectional screw (2) is installed in the working groove (11). The outer end of the bidirectional screw (2) is provided with a set of opposing first threaded ribs (21), and the inner side of the bidirectional screw (2) is provided with a set of opposing second threaded ribs (22). A blocking ring (23) is provided between the first threaded ribs (21) and the second threaded ribs (22). A spring (24) is fixedly connected to the side of the blocking ring (23) near the second threaded ribs (22). Two sets of sliding components (3) are arranged opposite to each other on the base plate (1). The bottom of the sliding component (3) is provided with a sliding block (31) that matches the limiting groove (12). The bottom of the sliding component (3) is provided with a working block (32). The working block (32) is provided with a threaded groove that matches the first threaded rib (21) of the bidirectional screw (2). The working block (32) matches the sliding groove (13). Two sets of adjustment components (4) are arranged opposite to each other inside the sliding component (3). The adjustment component (4) matches the groove (14), and the side of the adjustment component (4) near the blocking ring (23) abuts against the end of the spring (24) away from the blocking ring (23). The adjustment component (4) has an internal thread that matches the second threaded rib (22). The pre-push rod (5) is rotatably disposed between the two sets of the adjustment components (4); Two sets of clamping components (6) are rotatably disposed above the two sets of sliding components (3) for clamping FPC boards; A bidirectional drive motor (7) is fixedly installed on one side of the base plate (1), and the output end of the bidirectional drive motor (7) is connected to the bidirectional screw (2) to drive the bidirectional screw (2) to rotate.

2. The FPC board bending test fixture according to claim 1, characterized in that: The barrier ring (23) and the bidirectional screw (2) are an integrated structure or fixed by interference fit, and the outer diameter of the barrier ring (23) is adapted to the width of the working groove (11).

3. The FPC board bending test fixture according to claim 1, characterized in that: The spring (24) is a compression spring, the axis of the spring (24) is parallel to the axis of the bidirectional screw (2), and the free length of the spring (24) is equal to the distance between the barrier ring (23) and the second threaded rib (22).

4. The FPC board bending test fixture according to claim 1, characterized in that: The sliding block (31) and the limiting groove (12) are fitted with a clearance fit, and the cross-sectional shape of the sliding block (31) is consistent with the cross-sectional shape of the limiting groove (12).

5. The FPC board bending test fixture according to claim 1, characterized in that: The two ends of the bidirectional screw (2) are rotatably connected to the inner wall of the working groove (11) through bearings (8), and the bearings (8) are embedded in the preset mounting holes on the inner wall of the two ends of the working groove (11).

6. The FPC board bending test fixture according to claim 1, characterized in that: The clamping assembly (6) includes a clamping frame (61), a support plate (62), a stabilizing rod (63), a clamping plate (64), and a threaded rotating rod (65). The two ends of the support plate (62) are fixedly connected to the inner walls of the clamping frame (61). The stabilizing rod (63) passes through the support plate (62) and is fixedly connected to the clamping plate (64) located below the support plate (62). The threaded rotating rod (65) rotatably connected to the top center of the clamping plate (64) is spirally connected to the support plate (62).

7. The FPC board bending test fixture according to claim 1, characterized in that: The two ends of the pre-top rod (5) are rotatably connected to the adjustment assembly (4) through a rotating shaft, and the adjustment assembly (4) has a rotating shaft hole that matches the rotating shaft.

8. The FPC board bending test fixture according to claim 7, characterized in that: The adjustment assembly (4) includes a push ring (41) and a connecting rod (42). The push ring (41) has sliders on both sides that match the limiting groove (12). The push ring (41) is rotatably connected to the pre-push rod (5) through the connecting rod (42).

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