Pneumatic clamp device

Abstract

The invention relates to the technical field of flying probe detection, and discloses a pneumatic clamp device which is suitable for a flying probe detector and comprises a fixed base plate, a clamping jaw assembly and a positioning guide part. Through the structural cooperation of the fixed substrate, the clamping jaw assembly and the positioning guide piece, the positioning precision and the clamping stability of the to-be-detected piece in the flying probe detection process can be effectively improved. The positioning guide part is matched with a positioning groove in the clamping plate, the positioning guide part is arranged in the positioning groove in a penetrating mode in the process that the clamping plate slides in a reciprocating mode in the Z-axis direction, deviation of the clamping plate in the X-axis direction and the Y-axis direction can be effectively limited, the stability of the movement path of the clamping plate in the clamping process is ensured, deviation of the clamping position is avoided, and therefore the clamping precision is improved. Meanwhile, the positioning guide piece is arranged on the fixed substrate and is used for limiting the position of the to-be-tested piece along the Y-axis direction, so that the positioning accuracy of the to-be-tested piece can be further improved. According to the invention, the test efficiency and the detection reliability in the flying probe detection process can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flying probe detection, and in particular to a pneumatic clamp device. Background Art

[0002] With the rapid development of electronic information technology, integrated circuit (IC) chips have become an indispensable core component in various electronic devices. In recent years, with the rise of fifth-generation mobile communication (5G) technology, IC chips have shown significant improvements in functional complexity and integration, prompting the continuous evolution of their packaging and mounting technologies. Traditional through-hole technology (THT) has gradually been replaced by surface mount technology (SMT), and chip-scale packaging (CSP) has been widely adopted to meet the dual needs of miniaturization and high performance.

[0003] Against this backdrop, printed circuit boards (PCBs), as crucial carriers of electrical signal transmission, are undergoing a gradual design evolution towards higher density and higher precision to accommodate the demands of high-frequency, high-speed signal transmission. Simultaneously, the test accuracy and automated processing capabilities of high-density PCBs have become crucial indicators of test equipment performance. Flying probe testers, with their flexibility and high efficiency, have become widely used for functional testing of a wide variety of small-batch PCBs due to their elimination of custom test fixtures.

[0004] However, existing flying probe test equipment still has shortcomings in its high-precision fixture structure, particularly in terms of stability during the clamping process, repeatable positioning accuracy, and protection of fragile PCB surfaces, making it difficult to meet the requirements of high-end applications. Some traditional fixtures rely on electric drive or manual adjustment, resulting in slow response speeds and non-adjustable clamping force, which can easily damage the PCB surface. Furthermore, deviations in the clamping position affect test repeatability and reliability. Summary of the Invention

[0005] In view of this, the present invention provides a pneumatic clamp device to solve the problems in the prior art of poor clamping accuracy of traditional clamps and deviation of the clamping position during the test, which leads to low test efficiency and poor reliability.

[0006] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0007] In the first aspect, the present invention provides a pneumatic clamp device suitable for a flying probe detection machine, comprising: a fixed base plate, a clamping jaw assembly and a positioning guide; the clamping jaw assembly includes a clamping plate, and the clamping jaw is provided with a positioning groove; the positioning guide is provided on the fixed base plate, and the positioning guide is arranged corresponding to the positioning groove. The workpiece to be tested is placed on the fixed base plate and one side of the workpiece is abutted against the positioning guide. The positioning guide is suitable for limiting the position of the workpiece to be tested along the Y-axis direction, and the clamping plate can slide back and forth along the Z-axis direction. The positioning guide is passed through the positioning groove so that the clamping plate is suitable for fixing the workpiece to be tested on the fixed base plate, and the positioning guide is suitable for limiting the position of the clamping plate in the X-axis and Y-axis directions during the reciprocating sliding along the Z-axis direction.

[0008] It has the following advantages:

[0009] The present invention provides a pneumatic clamp device, which can effectively improve the positioning accuracy and clamping stability of the workpiece to be tested during the flying probe test process by setting a fixed base plate, a clamping claw assembly and a positioning guide. Among them, the positioning guide cooperates with the positioning groove on the clamping plate. During the reciprocating sliding of the clamping plate along the Z-axis direction, the positioning guide is inserted into the positioning groove, which can effectively limit the offset of the clamping plate in the X-axis direction and the Y-axis direction, ensure the stability of the clamping plate movement path during the clamping process, avoid the deviation of the clamping position, and thus improve the clamping accuracy. At the same time, the positioning guide is provided on the fixed base plate and is used to limit the position of the workpiece to be tested along the Y-axis direction, which can further improve the positioning accuracy of the workpiece to be tested. Through the above-mentioned structural design, the problems of low test efficiency and poor reliability caused by inaccurate positioning and clamping offset of traditional clamps in the prior art are effectively overcome, and the test efficiency and detection reliability in the flying probe test process are improved, which has high practical value and promotion and application prospects.

[0010] According to some embodiments of the present invention, the clamping jaw assembly further includes a base plate, a movable plate, a driving member, a hinge and a connecting member, the base plate is fixedly connected to the fixed base plate, the movable plate is hinged to the base plate via the hinge, the driving end of the driving member is connected to the first end of the movable plate, the second end of the movable plate is connected to the clamping plate via the connecting member, the axial direction of the hinge is consistent with the Y-axis direction, and the driving member drives the movable plate to rotate around the axial direction of the hinge so that the base plate rotates along the Z-axis direction.

[0011] According to some embodiments of the present invention, the driving member includes a pneumatic piston and an air pipe joint, the pneumatic piston is arranged on the base plate and is connected to the first end of the movable plate, the air pipe joint is passed through the base plate, one end of the air pipe joint is connected to the pneumatic piston, and the other end of the air pipe joint is connected to the air source, and the pneumatic piston can move along the Z-axis direction to drive the movable plate to rotate around the axis of the hinge.

[0012] According to some embodiments of the present invention, the clamping jaw assembly further includes a reset member, one end of the reset member is connected to the base plate, the other end of the reset member is connected to the movable plate, the reset member is arranged near the second end of the movable plate, the reset member provides the movable plate with an elastic force along the Z-axis direction so that the driving member is in a closed state, the reset member drives the movable plate to rotate around the axis direction of the hinge, and the clamping plate is in an open state.

[0013] According to some embodiments of the present invention, a guide column is provided on the bottom plate, and a guide hole is provided on the movable plate. The guide hole is arranged opposite to the guide column, and the guide column is suitable for passing through the guide hole to avoid deviation of the movable plate.

[0014] According to some embodiments of the present invention, the clamping jaw assembly further comprises an adjusting member provided on the base plate, the adjusting member being rotatable around the Z-axis direction, and the adjusting member being suitable for adjusting the rotation amplitude of the movable plate to control the distance between the clamping plate and the fixed base plate.

[0015] According to some embodiments of the present invention, the adjusting member is provided with a first step surface, a second step surface and an avoidance notch in sequence along the circumferential direction, and the adjusting member rotates around the Z-axis direction, the first step surface abuts against the lower end surface of the first end of the movable plate, so that the clamping plate and the fixed base plate have a first distance; the second step surface abuts against the lower end surface of the first end of the movable plate, so that the clamping plate and the fixed base plate have a second distance; the first end of the movable plate is passed through the avoidance notch to abut against the bottom plate, so that the clamping plate and the fixed base plate have a third distance;

[0016] The first interval is smaller than the second interval, and the second interval is smaller than the third interval.

[0017] According to some embodiments of the present invention, the pneumatic clamp device further includes a pad, which is sleeved on the positioning guide and placed on the fixed base plate, and the workpiece to be tested can be placed on the pad.

[0018] According to some embodiments of the present invention, a plurality of positioning guides are provided and are evenly spaced along the X-axis direction, and the number of the positioning guides is consistent with the number of the positioning grooves.

[0019] According to some embodiments of the present invention, the pneumatic clamp device further includes a limiting member, which is provided at one end of the fixed base plate and is suitable for limiting the position of the workpiece to be tested along the X-axis direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 An axial view of a pneumatic clamping device provided in some embodiments of the present invention;

[0022] Figure 2 A top view of a pneumatic clamp device provided in some embodiments of the present invention;

[0023] Figure 3 for Figure 2 Cross-sectional view of AA in the middle;

[0024] Figure 4 A partial structural diagram of a clamping jaw assembly provided in some embodiments of the present invention;

[0025] Figure 5 for Figure 4 Longitudinal cross-sectional view.

[0026] Description of reference numerals:

[0027] 1. Fixed base plate; 2. Clamping jaw assembly; 21. Clamping plate; 22. Bottom plate; 221. Guide column; 23. Movable plate; 231. Guide hole; 24. Driving member; 241. Pneumatic piston; 242. Air pipe joint; 25. Hinge; 26. Connecting member; 27. Resetting member; 28. Adjusting member; 281. First step surface; 282. Second step surface; 283. Avoidance gap; 3. Positioning guide; 4. Limiting member; 5. Pad. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Reference Figure 1 and Figure 2 As shown, in the first aspect of the present invention, the present invention provides a pneumatic clamp device, which is suitable for a flying probe detection machine, including: a fixed base plate 1, a clamping jaw assembly 2 and a positioning guide 3; the clamping jaw assembly 2 includes a clamping plate 21, and a positioning groove is provided on the clamping plate 21; the positioning guide 3 is provided on the fixed base plate 1, and the positioning guide 3 is arranged corresponding to the positioning groove. The workpiece to be tested is placed on the fixed base plate 1 and one side of the workpiece is abutted against the positioning guide 3. The positioning guide 3 is suitable for limiting the position of the workpiece to be tested along the Y-axis direction, and the clamping plate 21 can slide back and forth along the Z-axis direction. The positioning guide 3 is passed through the positioning groove so that the clamping plate 21 is suitable for fixing the workpiece to be tested on the fixed base plate 1, and the positioning guide 3 is suitable for limiting the position of the clamping plate 21 in the X-axis direction and the Y-axis direction during the reciprocating sliding along the Z-axis direction.

[0033] Specifically, the present invention provides a pneumatic clamp device that adopts a coordinated structural design of a fixed base plate 1, a clamping jaw assembly 2, and a positioning guide 3, which can effectively improve the positioning accuracy and clamping reliability of the test piece during the flying probe test. Specifically, by providing a positioning groove on the clamping plate 21 and providing a positioning guide 3 corresponding to the positioning groove on the fixed base plate 1, when the clamping plate 21 slides back and forth along the Z-axis direction, the positioning guide 3 is inserted into the positioning groove, which can effectively limit the position of the clamping plate 21 in the X-axis and Y-axis directions during its movement, thereby preventing the clamping plate 21 from generating lateral or longitudinal offset during the clamping process, ensuring the stability and repeatability of the clamping action, and improving the clamping accuracy.

[0034] It can be understood that by placing the workpiece to be tested on the fixed substrate 1 and making one side of it abut against the positioning guide 3, the positioning guide 3 can accurately position the workpiece to be tested along the Y-axis direction at the initial stage of placement, thereby avoiding positioning deviation problems caused by human operating errors or structural tolerances when placing the workpiece to be tested in traditional fixtures, helping to ensure the position consistency of the workpiece to be tested during the detection process and improving the accuracy and consistency of the detection data.

[0035] When the jaw assembly 2 is reciprocating, that is, when the clamping plate 21 slides back and forth along the Z-axis, the positioning guide 3 is adapted to limit the position of the clamping plate 21, thereby ensuring the stability of the reciprocating motion of the positioning guide 3 and achieving precise clamping of the workpiece to be tested. The positioning guide 3 is adapted to position the workpiece to be tested along the Y-axis and to guide and limit the position of the clamping plate 21.

[0036] The present invention solves the technical problems of low clamping accuracy, large positioning deviation, low testing efficiency, and poor detection reliability existing in traditional fixtures in the prior art. It has the advantages of simple structure, precise positioning, stable clamping, strong adaptability, and high detection efficiency. It improves the overall detection performance and reliability of flying probe detection equipment, and has good practical value and broad application prospects.

[0037] Reference Figure 3 、 Figure 4 and Figure 5 As shown, in some embodiments of the present invention, the clamping jaw assembly 2 further includes a base plate 22, a movable plate 23, a driving member 24, a hinge 25 and a connecting member 26. The base plate 22 is fixedly connected to the fixed base plate 1, the movable plate 23 is hinged to the base plate 22 through the hinge 25, the driving end of the driving member 24 is connected to the first end of the movable plate 23, and the second end of the movable plate 23 is connected to the clamping plate 21 through the connecting member 26. The axial direction of the hinge 25 is consistent with the Y-axis direction, and the driving member 24 drives the movable plate 23 to rotate around the axial direction of the hinge 25 so that the base plate rotates along the Z-axis direction.

[0038] In some embodiments of the present invention, the driving member 24 includes a pneumatic piston 241 and an air pipe connector 242. The pneumatic piston 241 is arranged on the base plate 22 and is connected to the first end of the movable plate 23. The air pipe connector 242 is passed through the base plate 22. One end of the air pipe connector 242 is connected to the pneumatic piston 241, and the other end of the air pipe connector 242 is connected to the air source. The pneumatic piston 241 can move along the Z-axis direction to drive the movable plate 23 to rotate around the axis of the hinge 25.

[0039] Specifically, the clamping jaw assembly 2 further includes a base plate 22, a movable plate 23, a driving member 24, a hinge 25 and a connecting member 26. The base plate 22 is fixedly connected to the fixed base plate 1, and the movable plate 23 is hinged to the base plate 22 via the hinge 25, and the axial direction of the hinge 25 is consistent with the axial direction. The driving end of the driving member 24 is connected to the first end of the movable plate 23, and the second end of the movable plate 23 is connected to the clamping plate 21 via the connecting member 26. When the driving member 24 is driven, the movable plate 23 rotates around the axial direction of the hinge 25, thereby driving the clamping plate 21 to move along the Z-axis direction to clamp or release the test piece. The driving member 24 includes a pneumatic piston 241 and an air pipe connector 242. The pneumatic piston 241 is arranged on the base plate 22 and connected to the first end of the movable plate 23. The air pipe joint 242 is passed through the base plate 22, one end of which is connected to the pneumatic piston 241, and the other end is connected to the air source. The air supply from the air source controls the pneumatic piston 241 to move along the Z-axis direction, thereby driving the movable plate 23 to rotate.

[0040] The present invention realizes the reciprocating sliding of the clamp 21 through pneumatic drive. Compared with the traditional mechanical clamping structure, pneumatic drive has the advantages of fast response speed, high control accuracy, stable and adjustable clamping force, etc., which helps to further improve the working efficiency and application scope of the clamp and meet the detection needs of different types of test pieces.

[0041] Reference Figure 3 As shown, in some embodiments of the present invention, the clamping jaw assembly 2 also includes a reset member 27, one end of the reset member 27 is connected to the base plate 22, and the other end of the reset member 27 is connected to the movable plate 23. The reset member 27 is arranged near the second end of the movable plate 23. The reset member 27 provides an elastic force along the Z-axis direction for the movable plate 23 so that the driving member 24 is in a closed state. The reset member 27 drives the movable plate 23 to rotate around the axis direction of the hinge 25, and the clamping plate 21 is in an open state.

[0042] It can be understood that the reset member 27 is a spring.

[0043] Specifically, to ensure that the jaw assembly 2 automatically resets when the driver 24 is not operating, the jaw assembly 2 also includes a reset member 27. One end of the reset member 27 is connected to the base plate 22, and the other end is connected to the movable plate 23. The reset member 27 is located near the second end of the movable plate 23. The reset member 27 provides an elastic force along the Z-axis for the movable plate 23. When the driver 24 is closed, the movable plate 23 automatically rotates about the axis of the hinge 25, placing the clamping plate 21 in the open position, facilitating the replacement or placement of a new test piece.

[0044] In some embodiments of the present invention, a guide column 221 is provided on the bottom plate 22 and a guide hole 231 is provided on the movable plate 23. The guide hole 231 is arranged opposite to the guide column 221. The guide column 221 is suitable for passing through the guide hole 231 to prevent the movable plate 23 from deviating.

[0045] Specifically, to prevent the movable plate 23 from shifting during movement, the base plate 22 is provided with a guide post 221, and the movable plate 23 is provided with a guide hole 231 that mates with the guide post 221. The guide post 221 is inserted into the guide hole 231, effectively preventing the movable plate 23 from shifting during movement, ensuring smooth and repeatable movement.

[0046] Reference Figure 4 As shown, in some embodiments of the present invention, the clamping jaw assembly 2 further includes an adjusting member 28 provided on the base plate 22, and the adjusting member 28 can rotate around the Z-axis direction. The adjusting member 28 is suitable for adjusting the rotation amplitude of the movable plate 23 to control the distance between the clamping plate 21 and the fixed base plate 1.

[0047] In some embodiments of the present invention, the adjusting member 28 is sequentially provided with a first step surface 281, a second step surface 282, and an avoidance notch 283 along the circumferential direction. When the adjusting member 28 rotates about the Z-axis, the first step surface 281 abuts against the lower end surface of the first end of the movable plate 23, so that the clamping plate 21 and the fixed base plate 1 have a first spacing; the second step surface 282 abuts against the lower end surface of the first end of the movable plate 23, so that the clamping plate 21 and the fixed base plate 1 have a second spacing; the first end of the movable plate 23 is passed through the avoidance notch 283 to abut against the bottom plate 22, so that the clamping plate 21 and the fixed base plate 1 have a third spacing;

[0048] The first spacing is smaller than the second spacing, and the second spacing is smaller than the third spacing.

[0049] Specifically, in order to facilitate adjustment of the clamping stroke and clamping force of the clamping jaw assembly 2, the clamping jaw assembly 2 also includes an adjustment member 28 provided on the base plate 22. The adjustment member 28 can rotate about the Z-axis direction and is suitable for adjusting the rotation amplitude of the movable plate 23, thereby controlling the spacing between the clamping plate 21 and the fixed base plate 1. Specifically, the adjustment member 28 is provided with a first step surface 281, a second step surface 282, and an avoidance notch 283 in sequence along the circumferential direction. When the adjustment member 28 rotates about the Z-axis direction, the first step surface 281 abuts against the lower end surface of the first end of the movable plate 23, so that the clamping plate 21 and the fixed base plate 1 have a first spacing; the second step surface 282 abuts against the lower end surface of the first end of the movable plate 23, so that the clamping plate 21 and the fixed base plate 1 have a second spacing; when the first end of the movable plate 23 passes through the avoidance notch 283 and abuts against the base plate 22, the clamping plate 21 and the fixed base plate 1 have a third spacing. The first spacing is smaller than the second spacing, and the second spacing is smaller than the third spacing, thereby achieving multi-level clamping adjustment, which is suitable for test pieces of different thicknesses or sizes.

[0050] In some embodiments of the present invention, the pneumatic clamp device further includes a pad 5 , which is sleeved on the positioning guide 3 and placed on the fixed base plate 1 , and the workpiece to be tested can be placed on the pad 5 .

[0051] Specifically, pad 5 is supported by an elastic material, preferably silicone or rubber. This increases friction with the test piece, improving clamping stability, while also preventing wear on the test piece. It is understood that to further enhance positioning accuracy, the thickness of pad 5 can be adjusted based on the thickness of the test piece, making it easier to replace pad 5 to accommodate test pieces of varying heights or shapes, enhancing versatility and applicability.

[0052] In some embodiments of the present invention, a plurality of positioning guide members 3 are provided and are evenly spaced along the X-axis direction, and the number of positioning guide members 3 is the same as the number of positioning slots.

[0053] Specifically, there can be multiple positioning guides 3, and they can be evenly spaced along the X-axis direction. Their number is consistent with the number of positioning grooves set on the clamping plate 21, so that when the clamping plate 21 moves, it can cooperate with multiple positioning guides 3 to achieve multi-point positioning and improve clamping stability.

[0054] It can be understood that in the clamping jaw assembly 2, multiple driving members 24 and movable plates 23 can be provided at intervals along the X-axis direction. Whether to pneumatically actuate multiple driving members 24 can be selected according to the length of the workpiece to be tested. When the length of the workpiece to be tested is less than the pressure plate, the driving members 24 located outside the length of the workpiece to be tested can be selected to be closed. At this time, the movable plate 23 moves with the pressure plate, reducing energy consumption while avoiding damage to the workpiece to be tested due to uneven force.

[0055] In some embodiments of the present invention, the pneumatic clamp device further includes a limiter 4 , which is disposed at one end of the fixed base plate 1 to limit the position of the workpiece to be tested along the X-axis direction.

[0056] Specifically, in order to further limit the position of the piece to be tested in the X-axis direction, a limit member 4 is further provided at one end of the fixed base plate 1. The limit member 4 is suitable for limiting the position of the piece to be tested along the X-axis direction to avoid lateral displacement of the piece to be tested when placed, thereby ensuring consistency in clamping and detection.

[0057] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A pneumatic clamping device suitable for a flying probe tester, characterized in that: include: Fixed base plate(1); The clamping jaw assembly (2) includes a clamping plate (21), wherein the clamping plate (21) is provided with a positioning groove; A positioning guide (3) is provided on the fixed substrate (1), and the positioning guide (3) is provided corresponding to the positioning groove. The workpiece to be tested is placed on the fixed substrate (1) and one side thereof abuts against the positioning guide (3). The positioning guide (3) is suitable for limiting the position of the workpiece to be tested along the Y-axis direction. The clamping plate (21) can slide back and forth along the Z-axis direction. The positioning guide (3) is passed through the positioning groove so that the clamping plate (21) is suitable for fixing the workpiece to be tested on the fixed substrate (1). The positioning guide (3) is suitable for limiting the position of the clamping plate (21) in the X-axis direction and the Y-axis direction during the reciprocating sliding along the Z-axis direction.

2. The pneumatic clamping device according to claim 1, characterized in that: The clamping jaw assembly (2) also includes a base plate (22), a movable plate (23), a driving member (24), a hinge (25) and a connecting member (26), wherein the base plate (22) is fixedly connected to the fixed base plate (1), the movable plate (23) is hinged to the base plate (22) through the hinge (25), the driving end of the driving member (24) is connected to the first end of the movable plate (23), and the second end of the movable plate (23) is connected to the clamping plate (21) through the connecting member (26), the axial direction of the hinge (25) is consistent with the Y-axis direction, and the driving member (24) drives the movable plate (23) to rotate around the axial direction of the hinge (25) so that the base plate rotates along the Z-axis direction.

3. The pneumatic clamping device according to claim 2, characterized in that: The driving member (24) includes a pneumatic piston (241) and an air pipe joint (242). The pneumatic piston (241) is arranged on the base plate (22) and connected to the first end of the movable plate (23). The air pipe joint (242) is passed through the base plate (22). One end of the air pipe joint (242) is connected to the pneumatic piston (241), and the other end of the air pipe joint (242) is connected to an air source. The pneumatic piston (241) can move along the Z-axis direction to drive the movable plate (23) to rotate around the axis of the hinge member (25).

4. The pneumatic clamping device according to claim 2, characterized in that: The clamping jaw assembly (2) also includes a reset member (27), one end of which is connected to the base plate (22), and the other end of which is connected to the movable plate (23). The reset member (27) is arranged close to the second end of the movable plate (23). The reset member (27) provides an elastic force along the Z-axis direction for the movable plate (23), so that the driving member (24) is in a closed state. The reset member (27) drives the movable plate (23) to rotate around the axis direction of the hinge (25), and the clamping plate (21) is in an open state.

5. The pneumatic clamping device according to claim 2, characterized in that: The bottom plate (22) is provided with a guide column (221), and the movable plate (23) is provided with a guide hole (231). The guide hole (231) is arranged opposite to the guide column (221), and the guide column (221) is suitable for passing through the guide hole (231) to prevent the movable plate (23) from deflecting.

6. The pneumatic clamping device according to claim 2, characterized in that: The clamping jaw assembly (2) further comprises an adjusting member (28) provided on the base plate (22), wherein the adjusting member (28) is rotatable about the Z-axis direction, and the adjusting member (28) is suitable for adjusting the rotation amplitude of the movable plate (23) to control the distance between the clamping plate (21) and the fixed base plate (1).

7. The pneumatic clamping device according to claim 6, characterized in that: The adjusting member (28) is provided with a first step surface (281), a second step surface (282) and an avoidance notch (283) in sequence along the circumferential direction. When the adjusting member (28) rotates around the Z-axis direction, the first step surface (281) abuts against the lower end surface of the first end of the movable plate (23), so that the clamping plate (21) and the fixed base plate (1) have a first spacing; the second step surface (282) abuts against the lower end surface of the first end of the movable plate (23), so that the clamping plate (21) and the fixed base plate (1) have a second spacing; the first end of the movable plate (23) is passed through the avoidance notch (283) to abut against the bottom plate (22), so that the clamping plate (21) and the fixed base plate (1) have a third spacing; The first interval is smaller than the second interval, and the second interval is smaller than the third interval.

8. The pneumatic clamping device according to claim 1, characterized in that: It also includes a pad (5), which is sleeved on the positioning guide (3) and placed on the fixed base plate (1), and the test piece can be placed on the pad (5).

9. The pneumatic clamping device according to claim 1, characterized in that: The positioning guide members (3) are provided in plurality and are evenly spaced along the X-axis direction, and the number of the positioning guide members (3) is the same as that of the positioning grooves.

10. The pneumatic clamp device according to any one of claims 1 to 9, characterized in that: It also includes a limiting member (4), which is arranged at one end of the fixed base plate (1) and is suitable for limiting the position of the test piece along the X-axis direction.

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