Stretch-resistant reinforcing structure of flexible PCB (Printed Circuit Board)

Abstract

The utility model, which belongs to the technical field of the flexible PCB, provides a tensile strengthening structure of a flexible PCB, comprising a flexible PCB substrate, a strengthening skeleton structure, an elastic clamping device, a deformation buffer layer and a fixed installation frame. A reinforcing skeleton structure is arranged on the peripheral edge of the flexible PCB substrate, and the reinforcing skeleton structure annularly surrounds the flexible PCB substrate; a plurality of grooves are formed in the inner side face of the reinforcing framework structure, and the edges of the flexible PCB substrate are embedded into the grooves. The elastic clamping device is installed on the upper surface of the reinforcing skeleton structure, and the deformation buffer layer is located on the lower surface of the flexible PCB substrate. The utility model provides a tensile strengthening structure of a flexible PCB (Printed Circuit Board), which can solve the problem that the existing flexible PCB is easy to deform and stretch.

Description

Technical Field

[0001] This utility model belongs to the field of flexible PCB technology, and more specifically, relates to a tensile reinforcement structure for flexible PCBs. Background Technology

[0002] As electronic devices become thinner, smaller, and more wearable, flexible PCBs are widely used in smartphones, tablets, wearable devices, and medical electronics due to their lightweight, flexibility, and bendability. However, flexible PCBs face serious tensile deformation problems during actual use. Because of their soft material, they are easily deformed by external forces during installation, debugging, and use, especially at the edges and corners, which are prone to tearing or breakage, leading to circuit breakage or poor contact, severely affecting product reliability and lifespan. Existing technologies commonly use methods to strengthen flexible PCBs, including: first, attaching a rigid reinforcing plate, such as an FR-4 material board, to the back of the flexible PCB; however, this reduces the overall flexibility of the PCB, and stress concentration easily occurs at the edges of the reinforcing plate; second, sealing the edges with hot melt adhesive or epoxy resin; however, these materials are prone to cracking after aging, offering limited protection; and third, using a metal frame for external fixation. However, traditional metal frame structures are too rigid and cannot adapt to the slight deformation of the flexible PCB under temperature changes, easily causing relative movement between the PCB and the frame, resulting in wear. In addition, the above methods generally have problems such as failing to evenly distribute stress, failing to effectively protect the corners of the PCB board, and being complicated to install or inconvenient to maintain. Utility Model Content

[0003] In view of this, the present invention provides a tensile reinforcement structure for flexible PCB boards, which can solve the problem that existing flexible PCB boards are prone to deformation and stretching.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a tensile reinforcement structure for a flexible PCB board, comprising: a flexible PCB substrate, a reinforcing skeleton structure, an elastic clamping device, a deformation buffer layer, and a fixed mounting frame; the reinforcing skeleton structure is provided around the perimeter of the flexible PCB substrate, and the reinforcing skeleton structure is annularly surrounding the flexible PCB substrate; the inner surface of the reinforcing skeleton structure has multiple grooves, and the edges of the flexible PCB substrate are embedded in the grooves; the elastic clamping device is mounted on the upper surface of the reinforcing skeleton structure, and the elastic clamping device includes a clamping arm and an elastic connecting part, the clamping arm being connected to the reinforcing skeleton structure through the elastic connecting part; the clamping arm has an arc-shaped structure, and the arc-shaped concave surface faces the center of the flexible PCB substrate; the deformation buffer layer is located on the lower surface of the flexible PCB substrate, and the deformation buffer layer is fully attached to the flexible PCB substrate; the fixed mounting frame is located below the deformation buffer layer, and the fixed mounting frame is fixedly connected to the reinforcing skeleton structure by bolts.

[0006] The technical advantages of the tensile reinforcement structure for flexible PCB boards provided by this utility model are as follows: A ring-shaped reinforcing skeleton structure surrounds the four edges of the flexible PCB substrate, forming a robust outer support frame that effectively prevents edge deformation of the flexible PCB board during use. An elastic clamping device is installed on the upper surface of the reinforcing skeleton structure, applying appropriate pressure to the PCB substrate through arc-shaped clamping arms to keep it flat. A deformation buffer layer fully adheres to the flexible PCB substrate, absorbing external impact forces and evenly distributing stress, preventing excessive bending of the PCB substrate under load. The fixed mounting frame is bolted to the reinforcing skeleton structure, forming a stable overall structure that improves the overall tensile strength and structural stability of the flexible PCB board.

[0007] Based on the above technical solution, the tensile strengthening structure of the flexible PCB board of this utility model can be further improved as follows:

[0008] The reinforcing skeleton structure is made of metal, and its cross-section is trapezoidal, with the upper base wider than the lower base. Multiple raised reinforcing ribs are evenly distributed around the outer periphery of the reinforcing skeleton structure, extending radially and gradually increasing in height from the inside out. An arc-shaped cut is provided every 90 degrees along the longitudinal direction of the inner ring of the reinforcing skeleton structure, and the curvature of the arc-shaped cut matches the corner curvature of the flexible PCB substrate.

[0009] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The reinforced skeleton structure made of metal has good strength and rigidity; the trapezoidal cross-section design, with the upper base wider than the lower base, increases the stability and torsional resistance of the structure. The evenly distributed raised reinforcing ribs on the outer perimeter extend radially, with their height gradually increasing from the inside to the outside, forming a gradual mechanical support structure that effectively enhances the overall rigidity and load-bearing capacity of the reinforced skeleton structure. The four arc-shaped cutouts on the inner ring match the corner curvature of the flexible PCB substrate, solving the stress concentration problem caused by uneven corner connections in traditional structures and reducing the risk of damage at the corners.

[0010] Furthermore, the elastic clamping device comprises four sets, each set being disposed at the center of the four edges of the reinforcing skeleton structure; each set of the elastic clamping device comprises three clamping arms, which are arranged radially at the elastic connecting part; the elastic connecting part is made of spring steel, one end of the elastic connecting part is engaged with the reinforcing skeleton structure via a slot, and the other end is connected to the clamping arm via a hinge shaft; the end of the clamping arm is provided with a rubber protective pad, which contacts the upper surface of the flexible PCB substrate.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: Four sets of elastic clamping devices are respectively set at the center of the four edges of the reinforced skeleton structure, realizing all-round balanced clamping of the flexible PCB substrate. Each set of three radially arranged clamping arms forms a multi-point clamping force distribution system, avoiding local stress concentration. The elastic connecting part made of spring steel is engaged with the reinforced skeleton structure through slots, ensuring reliable connection and appropriate elastic rebound force. The clamping arms are connected by hinge shafts, achieving flexible rotational adaptability. The rubber protective pads at the ends directly contact the flexible PCB substrate, not only increasing friction to prevent slippage but also avoiding potential damage to the PCB substrate surface from hard materials.

[0012] Furthermore, the elastic connection portion has an S-shaped bending structure in the middle, which enables the elastic connection portion to undergo elastic deformation after being subjected to force; the length of the clamping arm is one-quarter of the width of the flexible PCB substrate, the surface of the clamping arm is smooth, and the cross-section of the clamping arm is elliptical; a limiting block is provided at the connection between the clamping arm and the elastic connection portion, which prevents the clamping arm from excessively pressing down on the flexible PCB substrate.

[0013] The beneficial effects of the above-mentioned improved design are as follows: The S-shaped bending structure in the middle of the elastic connection section significantly improves the elastic deformation capacity and stress dispersion capacity of the elastic connection section, enabling the clamping device to generate appropriate elastic deformation without permanent deformation when subjected to external force. The clamping arm length is one-quarter of the PCB substrate width, ensuring appropriate coverage area and clamping force. The smooth surface treatment and elliptical cross-section design of the clamping arm reduce the risk of frictional damage to the PCB substrate. The setting of the limiting block effectively prevents the clamping arm from excessively pressing down on the PCB substrate, avoiding PCB substrate deformation or circuit damage caused by excessive pressure, and achieving a gentle and stable clamping effect.

[0014] Furthermore, the deformation buffer layer is made of silicone material and has a thickness of 2 mm; the surface of the deformation buffer layer is provided with a grid-like groove, the depth of which is 0.5 mm and the width of which is 0.8 mm; the grid-like groove divides the deformation buffer layer into multiple square buffer units, the size of which is 5 mm × 5 mm; an annular groove is provided between the edge of the deformation buffer layer and the inner wall of the reinforcing skeleton structure, and the annular groove is filled with elastic sealant.

[0015] The beneficial effects of the above-mentioned improved design are as follows: the deformation buffer layer made of silicone material has excellent elasticity and cushioning performance; the 2mm thickness design ensures cushioning effect without excessively increasing the overall thickness. The grid-like groove structure on the surface increases the compressible space of the deformation buffer layer, improving the cushioning effect. The grid-like grooves divide the buffer layer into 5mm × 5mm square buffer units, forming independent micro-buffer areas, enabling the buffer layer to adapt to stress in different directions and prevent stress transmission. The annular groove between the edge and the inner wall of the reinforcing skeleton structure is filled with elastic sealant, effectively sealing the edge gaps and preventing dust and liquid from seeping in.

[0016] Furthermore, the fixed mounting frame is made of aluminum alloy, and its shape matches the reinforcing skeleton structure; the fixed mounting frame has mounting holes at its four corners, which are connected to the threaded holes at corresponding positions on the reinforcing skeleton structure by bolts; a square through hole is opened in the middle of the fixed mounting frame, and the area of ​​the square through hole accounts for 80% of the total area of ​​the fixed mounting frame; anti-slip rubber pads are provided at the four bottom corners of the fixed mounting frame, and the anti-slip rubber pads are in contact with the mounting surface.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The fixed installation frame made of aluminum alloy material has lightweight and high strength characteristics, and its shape matches the reinforced skeleton structure, ensuring the integrity of the structure. The mounting holes at the four corners are connected to the reinforced skeleton structure with bolts to form a solid fixed structure, preventing loosening and deformation. The square through hole in the middle accounts for 80% of the total area, significantly reducing the weight of the frame while maintaining sufficient structural strength. The anti-slip rubber pads at the four bottom corners increase the friction with the mounting surface, preventing the device from sliding during use, improving stability, and also playing a role in shock absorption and protecting the mounting surface.

[0018] Furthermore, each of the four corners of the flexible PCB substrate is provided with a reinforcing corner piece, which is made of nylon material; the reinforcing corner piece has an L-shaped structure, and the two right-angled sides of the reinforcing corner piece are parallel to the two adjacent edges of the flexible PCB substrate; the thickness of the reinforcing corner piece is the same as the thickness of the flexible PCB substrate, and the reinforcing corner piece is bonded to the flexible PCB substrate by a hot-pressing process; the outer edge of the reinforcing corner piece is provided with a semi-circular protrusion, which matches the inner groove of the reinforcing skeleton structure.

[0019] The beneficial effects of the above-mentioned improved scheme are as follows: L-shaped reinforcing corner pieces made of nylon material are installed at the four corners of the flexible PCB substrate, effectively enhancing the corners' resistance to folding and deformation, and solving the problem of easy damage caused by insufficient corner strength in traditional flexible PCBs. The two right-angled sides of the reinforcing corner pieces are arranged parallel to the adjacent edges of the PCB substrate, forming a complete corner protection structure. The reinforcing corner pieces are the same thickness as the PCB substrate and are joined by a hot-pressing process, ensuring structural consistency and robustness. The semi-circular protrusions on the outer edges match the inner grooves of the reinforcing frame structure, forming a precise positioning mechanism to prevent displacement of the PCB substrate during use.

[0020] Furthermore, the reinforcing skeleton structure has multiple clamping protrusions evenly distributed around its inner periphery, with the clamping protrusions facing the edge of the flexible PCB substrate; the clamping protrusions are hemispherical in shape, with a diameter of 1.5 mm; the edge of the flexible PCB substrate is provided with positioning holes corresponding to the positions of the clamping protrusions, with the diameter of the positioning holes being slightly larger than the diameter of the clamping protrusions; after passing through the positioning holes, the clamping protrusions contact the deformation buffer layer to form a locking mechanism.

[0021] The beneficial effects of the above-mentioned improved scheme are as follows: The evenly distributed hemispherical clamping bumps within the reinforced skeleton structure cooperate with the positioning holes on the edge of the flexible PCB substrate to form a precise positioning and locking mechanism. The 1.5 mm diameter hemispherical design provides a moderate contact area, offering sufficient positioning force without damaging the PCB substrate. The positioning hole diameter, slightly larger than the clamping bump diameter, allows for minor positional adjustments to accommodate the effects of thermal expansion and contraction. The locking mechanism formed by the clamping bumps passing through the positioning holes and contacting the deformation buffer layer not only achieves precise positioning of the PCB substrate but also enhances the overall tensile strength of the flexible PCB board by dispersing force at multiple points, preventing localized deformation and damage.

[0022] Furthermore, the upper surface of the reinforced skeleton structure is provided with an annular guide groove along the circumference, the annular guide groove being 3 mm wide and 2 mm deep; the bottom end of the elastic connecting part of the elastic clamping device is provided with a slider that matches the annular guide groove, the slider sliding within the annular guide groove; the inner wall of the annular guide groove is provided with multiple positioning recesses, and the slider is provided with positioning protrusions that cooperate with the positioning recesses; the positioning protrusions can disengage from the positioning recesses under external force, allowing the elastic clamping device to adjust its position within the annular guide groove.

[0023] The beneficial effects of the above-mentioned improvement scheme are as follows: the annular guide groove on the upper surface of the reinforced skeleton structure cooperates with the slider at the bottom of the elastic clamping device to form an adjustable clamping system. The 3 mm wide and 2 mm deep guide groove design provides sufficient space for the slider to move and guide. The slider's sliding design within the annular guide groove allows the elastic clamping device to adjust its position according to PCB substrates of different sizes and shapes, enhancing the device's adaptability and versatility. The positioning recesses on the inner wall of the guide groove cooperate with the positioning protrusions on the slider to form a segmented positioning mechanism, enabling the elastic clamping device to be stably fixed in multiple positions, while also allowing for position adjustment under external forces, achieving a perfect balance between fixation and flexibility.

[0024] Furthermore, the surface of the flexible PCB substrate is uniformly distributed with multiple reinforcing ribs arranged in a wavy pattern; the reinforcing ribs are composed of a reinforcing layer of the same material as the flexible PCB substrate, the height of the reinforcing ribs is 0.3 mm, and the width is 0.5 mm; the distance between two adjacent reinforcing ribs is 10 mm; the two ends of the reinforcing ribs are in contact with the inner surface of the reinforcing skeleton structure; the number of reinforcing ribs is at least 10, and the multiple reinforcing ribs are distributed in a grid pattern on the surface of the flexible PCB substrate.

[0025] The beneficial effects of the above-mentioned improvement scheme are as follows: the uniformly distributed wavy reinforcing ribs on the surface of the flexible PCB substrate form a structural reinforcement network, significantly improving the bending resistance of the PCB substrate. The reinforcing ribs are constructed using a reinforcement layer of the same material as the PCB substrate, ensuring material compatibility and strong bonding. The 0.3 mm high and 0.5 mm wide reinforcing rib dimensions provide sufficient strength without excessively increasing the overall thickness and weight. The 10 mm spacing between adjacent reinforcing ribs ensures a uniform distribution of the reinforcement effect. The ends of the reinforcing ribs contact the inner surface of the reinforcing skeleton structure, forming an integrated support system from the center to the edge. At least 10 reinforcing ribs are distributed in a grid-like staggered pattern, which not only enhances the overall rigidity of the PCB substrate but also forms a multi-directional stress dispersion structure, effectively preventing deformation and stretching of the PCB substrate in all directions.

[0026] Compared with existing technologies, the beneficial effects of the tensile reinforcement structure for flexible PCB boards provided by this utility model are as follows: The combination of the annular reinforcing skeleton structure and the perimeter of the flexible PCB substrate effectively improves the edge strength of the flexible PCB board, preventing edge deformation and tearing. The elastic clamping device applies appropriate pressure to the PCB substrate through multi-point distributed arc-shaped clamping arms, keeping it flat. Simultaneously, the S-shaped bending structure of the elastic connection provides a buffering effect, preventing excessive pressure on the PCB substrate. The deformation buffer layer fully adheres to the PCB substrate, and the grid-like groove structure enhances the buffering effect, effectively absorbing external impact forces and evenly dispersing stress. The fixed mounting frame and the reinforcing skeleton structure are bolted together to form a stable whole, providing a solid mounting foundation. The reinforcing corner pieces enhance the folding resistance of the PCB substrate corners, and the cooperation between the clamping protrusions and positioning holes forms a precise positioning mechanism. The annular guide groove design allows for adjustable clamping device positions to adapt to PCB substrates of different sizes. The wavy reinforcing rib network significantly improves the bending resistance of the PCB substrate. The overall structural design ensures the tensile strength of the flexible PCB board while retaining its original flexibility, effectively preventing various deformation damages, improving the reliability and service life of the flexible PCB board, and meeting the high reliability requirements of modern electronic equipment for flexible PCB boards. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a tensile reinforcement structure for a flexible PCB board.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 10. Flexible PCB substrate; 20. Reinforced skeleton structure; 30. Elastic clamping device; 40. Deformation buffer layer; 50. Fixed mounting frame. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0032] like Figure 1 The diagram illustrates an embodiment of a tensile reinforcement structure for a flexible PCB board provided by this utility model. This embodiment includes: a flexible PCB substrate 10, a reinforcing skeleton structure 20, an elastic clamping device 30, a deformation buffer layer 40, and a fixed mounting frame 50. The reinforcing skeleton structure is provided around the perimeter of the flexible PCB substrate, forming a ring around the substrate. Multiple grooves are provided on the inner side of the reinforcing skeleton structure, with the edges of the flexible PCB substrate embedded within these grooves. The elastic clamping device is mounted on the upper surface of the reinforcing skeleton structure and includes a clamping arm and an elastic connecting part. The clamping arm is connected to the reinforcing skeleton structure via the elastic connecting part. The clamping arm has an arc-shaped structure, with its concave surface facing the center of the flexible PCB substrate. The deformation buffer layer is located on the lower surface of the flexible PCB substrate, fully conforming to it. The fixed mounting frame is located below the deformation buffer layer and is fixedly connected to the reinforcing skeleton structure via bolts.

[0033] In the above technical solution, the reinforcing skeleton structure is made of metal, and the cross-section of the reinforcing skeleton structure is trapezoidal, with the upper base of the trapezoid being wider than the lower base; multiple raised reinforcing ribs are evenly arranged around the outer periphery of the reinforcing skeleton structure, and the reinforcing ribs extend radially, with the height of the reinforcing ribs gradually increasing from the inside to the outside; an arc-shaped cut is provided every 90 degrees along the longitudinal direction of the inner ring of the reinforcing skeleton structure, and the curvature of the arc-shaped cut matches the corner curvature of the flexible PCB substrate.

[0034] Furthermore, in the above technical solution, the elastic clamping device includes four sets, each set of elastic clamping devices is respectively set in the middle of the four edges of the reinforcing skeleton structure; each set of elastic clamping devices includes three clamping arms, the three clamping arms are arranged radially at the elastic connection part; the elastic connection part is made of spring steel, one end of the elastic connection part is engaged with the reinforcing skeleton structure through a slot, and the other end is connected to the clamping arm through a hinge shaft; the end of the clamping arm is provided with a rubber protective pad, the rubber protective pad is in contact with the upper surface of the flexible PCB substrate.

[0035] Furthermore, in the above technical solution, the middle part of the elastic connection has an S-shaped bending structure, which enables the elastic connection to undergo elastic deformation after being subjected to force; the length of the clamping arm is one-quarter of the width of the flexible PCB substrate, the surface of the clamping arm is smooth, and the cross-section of the clamping arm is elliptical; a limiting block is provided at the connection between the clamping arm and the elastic connection, which prevents the clamping arm from excessively pressing down on the flexible PCB substrate.

[0036] Furthermore, in the above technical solution, the deformation buffer layer is made of silicone material and has a thickness of 2 mm; the surface of the deformation buffer layer is provided with a grid-like groove, the depth of which is 0.5 mm and the width of which is 0.8 mm; the grid-like groove divides the deformation buffer layer into multiple square buffer units, the size of which is 5 mm × 5 mm; an annular groove is provided between the edge of the deformation buffer layer and the inner wall of the reinforcing skeleton structure, and the annular groove is filled with elastic sealant.

[0037] Furthermore, in the above technical solution, the fixed installation frame is made of aluminum alloy material, and the shape of the fixed installation frame matches the reinforcing skeleton structure; the fixed installation frame has mounting holes at its four corners, and the mounting holes are connected to the threaded holes at corresponding positions on the reinforcing skeleton structure by bolts; a square through hole is opened in the middle of the fixed installation frame, and the area of ​​the square through hole accounts for 80% of the total area of ​​the fixed installation frame; anti-slip rubber pads are provided at the four bottom corners of the fixed installation frame, and the anti-slip rubber pads are in contact with the mounting surface.

[0038] Furthermore, in the above technical solution, each of the four corners of the flexible PCB substrate is provided with a reinforcing corner piece, which is made of nylon material; the reinforcing corner piece has an L-shaped structure, and the two right-angled sides of the reinforcing corner piece are parallel to the two adjacent edges of the flexible PCB substrate respectively; the thickness of the reinforcing corner piece is the same as the thickness of the flexible PCB substrate, and the reinforcing corner piece is bonded to the flexible PCB substrate by a hot pressing process; the outer edge of the reinforcing corner piece is provided with a semi-circular protrusion, which matches the inner groove of the reinforcing skeleton structure.

[0039] Furthermore, in the above technical solution, multiple clamping protrusions are evenly distributed around the inner periphery of the reinforcing skeleton structure, with the clamping protrusions facing the edge of the flexible PCB substrate; the shape of the clamping protrusions is hemispherical, with a diameter of 1.5 mm; the edge of the flexible PCB substrate is provided with positioning holes corresponding to the positions of the clamping protrusions, with the diameter of the positioning holes being slightly larger than the diameter of the clamping protrusions; after passing through the positioning holes, the clamping protrusions contact the deformation buffer layer to form a locking mechanism.

[0040] Furthermore, in the above technical solution, the upper surface of the reinforced skeleton structure is provided with an annular guide groove along the circumference, the width of the annular guide groove is 3 mm and the depth is 2 mm; the bottom end of the elastic connecting part of the elastic clamping device is provided with a slider that matches the annular guide groove, and the slider slides in the annular guide groove; the inner wall of the annular guide groove is provided with multiple positioning recesses, and the slider is provided with positioning protrusions that cooperate with the positioning recesses; the positioning protrusions can disengage from the positioning recesses under the action of external force, so that the elastic clamping device can adjust its position in the annular guide groove.

[0041] Furthermore, in the above technical solution, multiple reinforcing ribs are evenly distributed on the surface of the flexible PCB substrate, and the reinforcing ribs are arranged in a wave-like pattern; the reinforcing ribs are composed of a reinforcing layer of the same material as the flexible PCB substrate, the height of the reinforcing ribs is 0.3 mm, and the width is 0.5 mm; the distance between two adjacent reinforcing ribs is 10 mm; the two ends of the reinforcing ribs are in contact with the inner surface of the reinforcing skeleton structure; the number of reinforcing ribs is at least 10, and the multiple reinforcing ribs are distributed in a grid pattern on the surface of the flexible PCB substrate.

[0042] Specifically, the principle of this utility model is as follows: First, L-shaped reinforcing corner pieces are installed at the four corners of the flexible PCB substrate, and the reinforcing corner pieces are firmly bonded to the PCB substrate through a hot-pressing process. Then, a deformation buffer layer is attached to the lower surface of the flexible PCB substrate, ensuring complete adhesion without air bubbles. Next, the edge of the PCB substrate is aligned with the positioning holes on the inner side of the reinforcing frame structure's clamping protrusions, and gently pressed to allow the protrusions to pass through the positioning holes and contact the deformation buffer layer. The four edges of the PCB substrate are then embedded into the grooves on the inner side of the reinforcing frame structure, ensuring the edges are fully inserted into the grooves and adhere to the inner wall of the grooves. Subsequently, the position of the elastic clamping device is adjusted so that the slider of the elastic clamping device slides to the appropriate position within the annular guide groove on the upper surface of the reinforcing frame structure, and the positioning protrusion of the elastic connection part is locked into the positioning recess. The clamping arm is lightly pressed to allow its rubber protective pad to contact the upper surface of the PCB substrate, forming appropriate pressure. Finally, the fixed mounting frame is placed below the deformation buffer layer, aligned with the threaded holes corresponding to the positions on the reinforcing frame structure through the mounting holes, and bolts are used to securely connect the fixed mounting frame to the reinforcing frame structure, forming a stable integrated structure. After installation, check if the flexible PCB substrate is flat and if the clamping arms are evenly contacting the PCB substrate surface. Once confirmed to be free of abnormalities, proceed with the subsequent installation of electronic components and system connection. During use, if it is necessary to adjust the clamping force, a slight external force can be applied to disengage the positioning protrusion of the clamping device from the positioning recess, adjust the position of the clamping device, and then fix it again.

Claims

1. A stretch-resistant reinforcement structure for a flexible PCB board, characterized by, The application relates to a flexible PCB substrate, a reinforcing framework structure, an elastic clamping device, a deformation buffer layer and a fixed mounting frame. The four peripheral edges of the flexible PCB substrate are provided with the reinforcing framework structure which surrounds the flexible PCB substrate in a ring shape; the inner side of the reinforcing framework structure is provided with a plurality of grooves in which the edges of the flexible PCB substrate are embedded; the elastic clamping device is mounted on the upper surface of the reinforcing framework structure and comprises clamping arms and elastic connecting parts; the clamping arms are connected with the reinforcing framework structure through the elastic connecting parts; the clamping arms are in an arc shape and the concave surface of the arc shape faces the center of the flexible PCB substrate; the deformation buffer layer is located on the lower surface of the flexible PCB substrate and is fully attached to the flexible PCB substrate; and the fixed mounting frame is located below the deformation buffer layer.

2. The stretch-resistant reinforcing structure of a flexible PCB board according to claim 1, wherein, The reinforcing framework structure is made of metal and the cross section of the reinforcing framework structure is in a trapezoidal shape; the upper base of the trapezoidal shape is wider than the lower base; and the outer periphery of the reinforcing framework structure is uniformly provided with a plurality of convex reinforcing ribs which extend along the radial direction and gradually increase in height from the inside to the outside.

3. The stretch-resistant reinforcing structure of a flexible PCB board according to claim 2, wherein, The elastic clamping device comprises four groups, each of which is arranged at the middle of the four edges of the reinforcing framework structure; the end of the clamping arm is provided with a rubber protection pad which is in contact with the upper surface of the flexible PCB substrate.

4. The stretch-resistant reinforcing structure of a flexible PCB board according to claim 3, wherein, The middle part of the elastic connecting part has an S-shaped bending structure which enables the elastic connecting part to elastically deform under stress; the length of the clamping arm accounts for one fourth of the width of the flexible PCB substrate; a limiting block is arranged at the connecting position of the clamping arm and the elastic connecting part to prevent the clamping arm from excessively pressing the flexible PCB substrate downwards.

5. The stretch-resistant reinforcing structure of a flexible PCB board according to claim 4, wherein, The deformation buffer layer is made of silica gel material and has a thickness of 2 mm; the surface of the deformation buffer layer is provided with grid-shaped grooves which have a depth of 0.5 mm and a width of 0.8 mm; and an annular groove is arranged between the edge of the deformation buffer layer and the inner wall of the reinforcing framework structure and is filled with elastic sealant.

6. The stretch-resistant reinforcing structure of a flexible PCB board according to claim 5, wherein, The fixed mounting frame is made of aluminum alloy material and has a shape matched with the reinforcing framework structure; the four corners of the fixed mounting frame are provided with mounting holes which are connected with the threaded holes at the corresponding positions on the reinforcing framework structure through bolts; a square through hole is arranged in the middle part of the fixed mounting frame; and anti-skid rubber pads are arranged at the four corners of the bottom of the fixed mounting frame and are in contact with the mounting plane.

7. The stretch-resistant reinforcing structure of a flexible PCB board according to claim 6, wherein, Four corners of the flexible PCB substrate are respectively provided with a reinforcing corner piece, the reinforcing corner piece is made of nylon material; the reinforcing corner piece is L-shaped structure, two right angle edges of the reinforcing corner piece are respectively parallel to two adjacent edges of the flexible PCB substrate; thickness of the reinforcing corner piece is same as thickness of the flexible PCB substrate; outer side edge of the reinforcing corner piece is provided with semicircular convex, the semicircular convex is consistent with inner side groove of the reinforcing framework structure.

8. The stretch-resistant reinforcing structure of a flexible PCB board according to claim 7, wherein, Inner periphery of the reinforcing framework structure is uniformly distributed with multiple clamping convex, the clamping convex is towards edge of the flexible PCB substrate; shape of the clamping convex is semispherical, diameter of the semispherical is 1.5mm; edge of the flexible PCB substrate is provided with positioning hole corresponding to position of the clamping convex; the clamping convex is contacted with the deformation buffer layer after passing through the positioning hole, forming locking mechanism.

9. The stretch-resistant reinforcing structure of a flexible PCB board according to claim 8, wherein, Upper surface of the reinforcing framework structure is provided with annular guide groove along circumference, width of the annular guide groove is 3mm, depth is 2mm.

10. The stretch-resistant reinforcing structure of a flexible PCB board according to claim 9, wherein, Surface of the flexible PCB substrate is uniformly distributed with multiple reinforcing ribs, the reinforcing ribs are arranged in wave shape.

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