Sensor with S-shaped flexible PCB

Abstract

The utility model discloses a sensor with an S-shaped flexible PCB, which comprises an elastic body, a strain gauge and a flexible PCB, the flexible PCB is attached to the elastic body, the flexible PCB comprises a first circuit board, a second circuit board and a transition board, the transition board is integrally arranged between the first circuit board and the second circuit board, the first circuit board is connected with the strain gauge, and the second circuit board is connected with the S-shaped flexible PCB. L-shaped connecting parts are formed among the four top corners of the transition plate, the first circuit board and the second circuit board, and the strain gauge is attached to the strain area of the elastic body and abuts against the L-shaped connecting parts. According to the utility model, the flexible PCB passes through the strain area of the patch surface of the elastic body, the L-shaped connecting part enables the welding spot of the strain gauge to abut against the welding spot of the flexible PCB, and the flexible combination of the continuous S-shaped channel structure and the flexible PCB enables the influence of the flexible PCB on the sensor to be neglected, so that the effect of not influencing the performance of the sensor is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sensor technical field, concretely relates to a sensor with S-shaped flexible PCB board. BACKGROUND

[0002] Because of the special manufacturing process of sensor automatic connection circuit, it requires that the PCB and strain gauge welding point are close, and there is no conductor between them. At present, there are the following three technical solutions: first, the strain gauge is a full bridge piece, and the PCB is FR material or PI material. Second, the strain gauge is two half-bridge pieces, which are attached to the upper and lower surfaces of the elastic body, and the PCB is a flexible PCB, which passes through the side of the elastic body to realize assembly with the upper and lower strain gauges. Third, the strain gauge is four single pieces, which are attached to the corresponding strain regions on the upper and lower surfaces of the elastic body, and the PCB is a flexible PCB, which passes through the side of the elastic body and below the strain hole to realize assembly with the four single pieces on the upper and lower surfaces of the elastic body. The first and second solutions use full bridge pieces and half bridge pieces, and full bridge pieces are generally used in low-precision and mass-produced products. Half bridge pieces are generally not used because of their high price. In addition, the distance between the front and rear wire grids of the strain gauge determines the structure of the elastic body, and the design of the elastic body structure is limited, which is not suitable for other structure sensors. In the third solution, the PCB passes through the side of the elastic body and below the strain hole to realize assembly with the four single pieces on the upper and lower surfaces of the elastic body. This structure is only suitable for sensors with long hole spacing and high elastic body, and the height of the side surface rubber surface does not affect the installation and use of customers. In addition, the PCB passing through below the strain hole affects the efficiency of the four corner adjustment of the production line, so this structure is not suitable for other types of sensors.

[0003] Therefore, a sensor with an S-shaped flexible PCB board is urgently needed. INVENTION CONTENTS

[0004] To solve the defects in the prior art, the utility model provides a sensor with an S-shaped flexible PCB board.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] The utility model provides a sensor with an S-shaped flexible PCB board, which comprises an elastic body, a strain gauge and a flexible PCB board, the flexible PCB board is attached to the elastic body, the flexible PCB board comprises a first circuit board, a second circuit board and a transition plate, the transition plate is integrally arranged between the first circuit board and the second circuit board, four top corners of the transition plate and the first circuit board and the second circuit board form an L-shaped connecting part, and the strain gauge is attached to the strain region of the elastic body and closely contacts the L-shaped connecting part.

[0007] Preferably, the transition plate is provided with a transverse strip-shaped through hole located at the center of the transition plate, and a first vertical strip-shaped through hole is further arranged at intervals along the length direction of the transverse strip-shaped through hole, and a second vertical strip-shaped through hole is arranged at intervals on the side edges of the transition plate at both sides of the length direction, and the first vertical strip-shaped through hole and the second vertical strip-shaped through hole are arranged staggered in the length direction of the transition plate, and a continuous S-shaped channel is formed on the transition plate symmetrically relative to the transverse strip-shaped through hole.

[0008] Preferably, the elastic body is further provided with a cable mounting groove at at least one end in the length direction of the flexible PCB.

[0009] Preferably, the height of the strain area of the elastic body is lower than the mounting surface of the elastic body, and the strain gauge and the flexible PCB are coated with a silica gel layer, and the silica gel layer is lower than the mounting surface of the elastic body.

[0010] Preferably, the elastic body is further provided with a stress hole on the outer surface opposite to the mounting surface thereof.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] In the utility model, the flexible PCB passes through the patch surface strain area of the elastic body, the L-shaped connecting part makes the strain gauge welding point close to the flexible PCB welding point, and the continuous S-shaped channel structure and the softness of the flexible PCB are combined, so that the influence of the flexible PCB on the sensor is negligible, so that the effect of not affecting the performance of the sensor is realized. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the structure schematic view of the sensor with S-shaped flexible PCB of the utility model;

[0014] Figure 2 is the structure schematic view of the flexible PCB in the sensor with S-shaped flexible PCB of the utility model;

[0015] Figure 3 is the structure side view of the sensor with S-shaped flexible PCB of the utility model. DETAILED DESCRIPTION

[0016] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described here are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0017] In the description of the utility model, it should be understood that the directions or position relationships indicated by the terms "left", "right" and the like are all based on the drawings of the specification Figure 1The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] like Figures 1 to 3 As shown, this embodiment provides a sensor with an S-shaped flexible PCB board, including an elastic body 1, a strain gauge 3, and a flexible PCB board 2. The flexible PCB board 2 is attached to the elastic body 1. The flexible PCB board 2 includes a first circuit board 21, a second circuit board 22, and a transition plate 23. The transition plate 23 is integrally disposed between the first circuit board 21 and the second circuit board 22. The four apex corners of the transition plate 23 form an L-shaped connection with the first circuit board 21 and the second circuit board 22. The strain gauge 3 is attached to the strain area of ​​the elastic body 1 and close to the L-shaped connection.

[0020] In this embodiment, the transition plate 23 is provided with a horizontal strip-shaped through hole 230, which is located at the center of the transition plate 23. The horizontal strip-shaped through hole 230 is also provided with first vertical strip-shaped through holes 231 at intervals along its length direction. The sides of the transition plate 23 along both sides of its length direction are provided with second vertical strip-shaped through holes 232 at intervals. The first vertical strip-shaped through holes 231 and the second vertical strip-shaped through holes 232 are staggered in the length direction of the transition plate 23. The transition plate 23 forms a continuous S-shaped channel symmetrically with respect to the horizontal strip-shaped through holes.

[0021] In this embodiment, a cable mounting groove 4 is also provided on the right end of the elastic body 1 along the length of the flexible PCB board. The cable welding end passes through this waist-shaped cable mounting groove from the side hole and connects to the flexible PCB board.

[0022] In this embodiment, the height of the strain zone of the elastomer 1 is lower than the mounting surface of the elastomer 1, and the strain gauge 3 and the flexible PCB board 2 are coated with a silicone layer, which is also lower than the mounting surface of the elastomer 1.

[0023] In this embodiment, stress holes are provided on the outer surface of the elastomer 1 opposite to its mounting surface.

[0024] The working principle of this embodiment will be further explained below:

[0025] The flexible PCB 2 is attached on the elastic body 1, the strain gauge 3 is attached on the strain area of the elastic body 1 and close to the L-shaped connecting part, then the silicon glue is coated, the flexible PCB passes through the strain area of the patch surface of the elastic body, the L-shaped connecting part makes the strain gauge welding point close to the flexible PCB welding point, meanwhile, the combination of the continuous S-shaped channel structure and the softness of the flexible PCB makes the influence of the flexible PCB on the sensor negligible, so that the effect of not affecting the performance of the sensor is realized.

[0026] Finally, it should be noted that: the above only for the preferred embodiments of the present application and is not intended to limit the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement for the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included within the scope of the present application.

Claims

1. A sensor with an S-shaped flexible PCB board, characterized in that, The flexible PCB board (2) is attached on the elastic body (1), the flexible PCB board (2) comprises a first circuit board (21), a second circuit board (22) and a transition plate (23), the transition plate (23) is integrally arranged between the first circuit board (21) and the second circuit board (22), four top corners of the transition plate (23) and the first circuit board (21) and the second circuit board (22) form L-shaped connecting parts, and the strain gauge (3) is attached on the strain area of the elastic body (1) and is close to the L-shaped connecting parts.

2. The sensor with S-shaped flexible PCB according to claim 1, characterized in that, The transition plate (23) is provided with a horizontal strip-shaped through hole (230), the horizontal strip-shaped through hole (230) is located at the center position of the transition plate (23), first vertical strip-shaped through holes (231) are further arranged on the horizontal strip-shaped through hole (230) along the length direction, second vertical strip-shaped through holes (232) are arranged on the side edges of the transition plate (23) at the length direction, the first vertical strip-shaped through holes (231) and the second vertical strip-shaped through holes (232) are arranged staggered at the length direction of the transition plate (23), and a continuous S-shaped channel is formed on the transition plate (23) symmetrically relative to the horizontal strip-shaped through hole.

3. The sensor with S-shaped flexible PCB according to claim 1, characterized in that, The elastic body (1) is further provided with a cable mounting groove (4) at at least one end of the length direction of the flexible PCB board.

4. The sensor with S-shaped flexible PCB according to claim 1, characterized in that, The height of the strain area of the elastic body (1) is lower than the mounting surface of the elastic body (1), the strain gauge (3) and the flexible PCB board (2) are coated with a silica gel layer, and the silica gel layer is lower than the mounting surface of the elastic body (1).

5. The sensor with S-shaped flexible PCB according to claim 1, wherein, The elastic body (1) is further provided with a stress hole on the outer surface opposite to the mounting surface.

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