A pressure sensor metrology test fixture

Abstract

This invention discloses a pressure sensor metrology and testing fixture, belonging to the field of metrology and testing. It includes a frame on which a clamping mechanism and a variable angle testing mechanism are mounted. The clamping mechanism includes an outer ring and an inner ring fixedly mounted on the frame. The outer and inner rings are concentrically arranged and have several guide grooves corresponding to each other radially. A clamping arm is slidably disposed between the guide grooves of the outer and inner rings. A driving mechanism for driving the clamping arm to extend and retract radially is provided between the outer and inner rings. This invention provides stable and reliable clamping, strong adaptability, and adopts a concentric ring clamping structure with multiple clamping arms synchronously extending and retracting radially, achieving uniform force clamping at multiple points and avoiding deformation and damage to the sensor housing caused by single-point or two-point clamping. The clamping arms can be radially adjusted over a wide range to accommodate pressure sensors of different diameters, and the clamping ends are equipped with buffer silicone to further protect the tested component.

Description

Technical Field

[0001] This invention belongs to the field of metrology and testing, and in particular relates to a pressure sensor metrology and testing fixture. Background Technology

[0002] As a core detection component in fields such as industrial automation, aerospace, and automotive electronics, the measurement accuracy of pressure sensors directly affects the operational reliability of the system. Therefore, rigorous pressure measurement tests must be conducted during production and use.

[0003] Currently, existing pressure sensor metrology and testing fixtures generally suffer from the following defects: First, the clamping mechanism mostly adopts a single-point or two-point clamping method, resulting in uneven clamping force distribution, which can easily cause deformation or even damage to the sensor shell, and is difficult to adapt to sensors of different diameters; Second, the testing function is limited, and most can only perform vertical pressure testing, failing to simulate the multi-angle tilt pressure experienced by the sensor under actual working conditions, leading to a significant deviation between the test results and actual performance; Third, the angle adjustment of existing fixtures is mostly done manually, resulting in low adjustment accuracy, cumbersome operation, and a lack of reliable locking mechanisms, making it prone to angle deviation during testing, and failing to meet the requirements of high-precision, automated metrology and testing. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure sensor measurement and testing fixture to overcome the shortcomings of the prior art.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: A pressure sensor measurement and testing fixture includes a frame, on which a clamping mechanism and a variable angle testing mechanism are mounted. The clamping mechanism includes an outer ring and an inner ring fixedly mounted on the frame. The outer ring and the inner ring are concentrically arranged and have a plurality of guide grooves corresponding to each other in the radial direction. A clamping arm is slidably arranged between the guide grooves corresponding to the outer ring and the inner ring. A driving mechanism for driving the clamping arm to extend and retract radially is provided between the outer ring and the inner ring.

[0006] Furthermore, the guide groove is stepped and includes a sliding section and a limiting section. The clamping arm is slidably disposed in the sliding section. The clamping arm includes a rack. A slider is fixed on the side of the rack away from the teeth. The top surface of the slider is flush with the bottom surface of the limiting section. A pressure plate is bolted in the limiting section. The pressure plate cooperates with the slider to limit the longitudinal displacement of the rack.

[0007] Furthermore, the driving mechanism includes a gear ring rotatably disposed at the bottom of the outer ring, and a plurality of gears rotatably connected to the frame are disposed between the outer ring and the inner ring, the number of gears corresponding to the clamping arm, the lower part of the gear meshing with the gear ring, and the upper part meshing with the rack.

[0008] Furthermore, the drive mechanism also includes a first motor fixed on the frame, the output end of the first motor being connected to one of the gears.

[0009] Furthermore, the working end of the clamping arm is an arc-shaped surface and is provided with cushioning silicone.

[0010] Furthermore, the variable angle testing mechanism includes a lateral displacement component, an angle adjustment component is fixed to the output end of the lateral displacement component, a cylinder is fixed to the output end of the angle adjustment component, and a hemispherical pressure head is fixed to the output end of the cylinder.

[0011] Furthermore, the lateral displacement component includes a bracket, a lateral guide rail fixed to the top of the bracket, a lead screw rotatably mounted inside the lateral guide rail, a second motor fixed to one side of the lateral guide rail, the output end of the second motor being connected to the lead screw via a transmission, a moving block threaded onto the lead screw, a connecting rod fixed to the moving block, and an angle adjustment component fixed to the end of the connecting rod.

[0012] Furthermore, the angle adjustment component includes a housing, inside which is a ring-shaped electric track, on which a third motor is fixed, and at the output end of the third motor is a transmission wheel. A ball bearing is rotatably mounted on one end of the housing near the cylinder, and a mounting seat is fixed on the ball bearing. The mounting seat is fixed to the cylinder.

[0013] Furthermore, the outer shell has several through grooves on the peripheral wall corresponding to the ball, an electric telescopic rod is fixed in the through groove, a locking block is fixed at the output end of the electric telescopic rod, and a rubber pad is provided on the surface of the locking block.

[0014] Furthermore, it also includes a PLC control unit, which is electrically connected to the clamping mechanism and the variable angle testing mechanism.

[0015] The pressure sensor metrology and testing fixture provided by this invention has the following advantages compared with the prior art: 1. Stable and reliable clamping with strong adaptability: It adopts a concentric ring clamping structure with multiple clamping arms that synchronously extend and retract radially, so as to achieve uniform force clamping at multiple points and avoid deformation and damage to the sensor shell caused by single-point or two-point clamping; the clamping arms can be radially adjusted over a wide range to adapt to pressure sensors of different diameters, and the clamping ends are equipped with buffer silicone to further protect the measured device. 2. Comprehensive testing functions and accurate results: The integrated variable angle testing mechanism can realize lateral displacement adjustment and multi-angle tilting pressure, which can simulate the non-vertical pressure that the sensor is subjected to in actual working conditions. It solves the limitation of traditional fixtures that can only perform vertical testing, and makes the test results closer to the actual performance. 3. High degree of automation and excellent precision: The clamping, displacement adjustment, angle adjustment and pressurization processes are all driven by motors and uniformly controlled by PLC control unit, replacing traditional manual operation. The adjustment accuracy is high and the operation is simple. The angle adjustment mechanism is equipped with an electric locking device, which can effectively prevent angle deviation during the test and meet the needs of high-precision and automated measurement and testing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the clamping mechanism of the present invention; Figure 3 for Figure 2 Cross-sectional view at point AA; Figure 4 This is a cross-sectional view of the guide groove of the present invention; Figure 5 This is a diagram showing the fit between the clamping arm and the pressure plate of the present invention. Figure 6 This is a cross-sectional view of the angle adjustment component of the present invention.

[0018] In the diagram: 1-Frame, 2-Outer ring, 3-Inner ring, 4-Guide groove, 5-Clamping arm, 6-Sliding section, 7-Limiting section, 8-Rack, 9-Slider, 10-Pressure plate, 11-Gear ring, 12-Gear, 13-First motor, 14-Cylinder, 15-Hemispherical pressure head, 16-Bracket, 17-Transverse guide rail, 18-Second motor, 19-Outer shell, 20-Electric track, 21-Third motor, 22-Ball bearing, 23-Mounting base, 24-Electric telescopic rod, 25-Locking block. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments: refer to Figure 1-6As shown, this invention provides a pressure sensor measurement and testing fixture, including a frame 1. A clamping mechanism and a variable angle testing mechanism are mounted on the frame 1. The clamping mechanism includes an outer ring 2 and an inner ring 3 fixedly mounted on the frame 1. The outer ring 2 and inner ring 3 are concentrically arranged and have several guide grooves 4 corresponding to each other radially. A clamping arm 5 is slidably arranged between the guide grooves 4 corresponding to the outer ring 2 and inner ring 3. A driving mechanism for driving the clamping arm 5 to extend and retract radially is provided between the outer ring 2 and inner ring 3. The annular clamping mechanism, composed of the outer ring 2, inner ring 3, multiple sets of guide grooves 4, and synchronously driven clamping arms 5, achieves synchronous radial extension and retraction of all clamping arms 5 through the meshing transmission of a gear ring 11 and multiple gears 12. This ensures a uniform distribution of clamping force circumferentially around the sensor, completely solving the problem of sensor shell deformation and damage caused by single-point or two-point clamping, while ensuring precise sensor alignment and improving testing accuracy. The clamping arm 5 can extend and retract freely in the radial direction under the action of the drive mechanism, which can adapt to pressure sensors of different diameters. There is no need to replace the clamping parts, which greatly improves the versatility and efficiency of the clamp and reduces the testing cost.

[0020] In a preferred embodiment, the guide groove 4 is stepped, including a sliding section 6 and a limiting section 7. The clamping arm 5 is slidably disposed within the sliding section 6. The clamping arm 5 includes a rack 8, and a slider 9 is fixed to the side of the rack 8 away from the teeth. The top surface of the slider 9 is flush with the bottom surface of the limiting section 7. A pressure plate 10 is bolted to the limiting section 7. The pressure plate 10 cooperates with the slider 9 to limit the longitudinal displacement of the rack 8. The driving mechanism includes a gear ring 11 rotatably disposed at the bottom of the outer ring 2. A plurality of gears 12 rotatably connected to the frame 1 are disposed between the outer ring 2 and the inner ring 3, and the number of gears 12 corresponds to the number of clamping arms 5. The lower part of the gear 12 meshes with the gear ring 11, and the upper part meshes with the rack 8. The driving mechanism also includes a first motor 13 fixed on the frame 1. The output end of the first motor 13 is connected to one of the gears 12. The working end of the clamping arm 5 is an arc-shaped surface and is provided with buffer silicone. The stepped guide groove 4, together with the slider 9 and pressure plate 10, effectively restricts the longitudinal displacement of the clamping arm 5, ensuring the stability and accuracy of the clamping motion. The working end of the clamping arm 5 adopts an arc-shaped surface design and is equipped with buffer silicone, which increases the contact area with the sensor housing, further disperses the clamping force, and at the same time plays a role in buffering and shock absorption, avoiding damage to the sensor caused by hard contact.

[0021] In a preferred embodiment, the variable angle testing mechanism includes a lateral displacement component, an angle adjustment component fixed to the output end of the lateral displacement component, a cylinder 14 fixed to the output end of the angle adjustment component, and a hemispherical pressure head 15 fixed to the output end of the cylinder 14. The variable angle testing mechanism, through the angle adjustment component, can drive the cylinder 14 and the hemispherical pressure head 15 to achieve 360-degree omnidirectional angle adjustment, simulating the pressure pressure experienced by the pressure sensor at any angle under actual working conditions. This overcomes the limitation of traditional fixtures, which can only perform vertical pressure testing, making the test results closer to the actual performance of the sensor and improving the accuracy and reliability of the test. The hemispherical pressure head 15 ensures good contact with the sensor surface at any angle, guaranteeing the stability and uniformity of pressure transmission and avoiding test errors caused by poor contact.

[0022] In a preferred embodiment, the lateral displacement assembly includes a bracket 16, with a lateral guide rail 17 fixed to the top of the bracket 16. A lead screw is rotatably mounted inside the lateral guide rail 17. A second motor 18 is fixed to one side of the lateral guide rail 17, and the output end of the second motor 18 is connected to the lead screw via a transmission connection. A moving block is threaded onto the lead screw, and a connecting rod is fixed to the moving block. An angle adjustment assembly is fixed to the end of the connecting rod. The lateral displacement assembly employs a lead screw transmission structure, which can precisely adjust the lateral position of the hemispherical pressure head 15, enabling precise pressure testing at different test points on the sensor surface. This further enriches the testing functions and meets the testing requirements under complex working conditions.

[0023] In a preferred embodiment, the angle adjustment assembly includes a housing 19, inside which is a ring-shaped electric track 20. A third motor 21 is fixed on the ring-shaped electric track 20, and a transmission wheel 22 is fixed to the output end of the third motor 21. A ball bearing 22 is rotatably mounted on one end of the housing 19 near the cylinder 14, and a mounting seat 23 is fixed to the ball bearing 22. The mounting seat 23 is fixed to the cylinder 14. Several through slots are formed on the peripheral wall of the housing 19 corresponding to the ball bearing 22. An electric telescopic rod 24 is fixed in the through slots, and a locking block 25 is fixed to the output end of the electric telescopic rod 24. A rubber pad is provided on the surface of the locking block 25. Through the locking mechanism composed of the electric telescopic rod 24 and the locking block 25 with rubber pad, after the angle adjustment is completed, the electric telescopic rod 24 pushes the locking block 25 to press the ball bearing 22, and the angle is reliably locked by friction, effectively preventing angle deviation during the test and ensuring the stability of the test process and the consistency of the test results.

[0024] In a preferred embodiment, a PLC control unit is also included, which is electrically connected to the clamping mechanism and the variable angle testing mechanism. Centralized control of the clamping mechanism and the variable angle testing mechanism via the PLC control unit enables automated operation of the entire process, including sensor clamping, lateral positioning, angle adjustment, and pressure testing. This further improves testing efficiency and accuracy, meeting the requirements for high-precision, automated metrology testing.

[0025] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not 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 application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0026] It should be noted that in this application, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A pressure sensor measurement and testing fixture, characterized in that, The device includes a frame (1), on which a clamping mechanism and a variable angle testing mechanism are installed. The clamping mechanism includes an outer ring (2) and an inner ring (3) fixedly mounted on the frame (1). The outer ring (2) and the inner ring (3) are concentrically arranged and have a number of guide grooves (4) corresponding to each other in the radial direction. A clamping arm (5) is slidably arranged between the guide grooves (4) corresponding to the outer ring (2) and the inner ring (3). A driving mechanism for driving the clamping arm (5) to extend and retract in the radial direction is provided between the outer ring (2) and the inner ring (3).

2. The pressure sensor metrology and testing fixture according to claim 1, characterized in that, The guide groove (4) is stepped and includes a sliding section (6) and a limiting section (7). The clamping arm (5) is slidably disposed in the sliding section (6). The clamping arm (5) includes a rack (8). A slider (9) is fixed on the side of the rack (8) away from the teeth. The top surface of the slider (9) is flush with the bottom surface of the limiting section (7). A pressure plate (10) is bolted in the limiting section (7). The pressure plate (10) cooperates with the slider (9) to restrict the longitudinal displacement of the rack (8).

3. The pressure sensor metrology and testing fixture according to claim 2, characterized in that, The driving mechanism includes a gear ring (11) rotatably disposed at the bottom of the outer ring (2). A plurality of gears (12) rotatably connected to the frame (1) are provided between the outer ring (2) and the inner ring (3), and the number of gears (12) corresponds to the clamping arm (5). The lower part of the gear (12) meshes with the gear ring (11), and the upper part meshes with the rack (8).

4. The pressure sensor metrology and testing fixture according to claim 3, characterized in that, The drive mechanism also includes a first motor (13) fixed on the frame (1), and the output end of the first motor (13) is connected to one of the gears (12) for transmission.

5. The pressure sensor metrological testing fixture according to claim 1, characterized in that, The working end of the clamping arm (5) is an arc-shaped surface and is provided with buffer silicone.

6. The pressure sensor metrology and testing fixture according to claim 1, characterized in that, The variable angle testing mechanism includes a lateral displacement component, an angle adjustment component is fixed to the output end of the lateral displacement component, a cylinder (14) is fixed to the output end of the angle adjustment component, and a hemispherical pressure head (15) is fixed to the output end of the cylinder (14).

7. The pressure sensor metrological testing fixture according to claim 6, characterized in that, The lateral displacement assembly includes a bracket (16), a lateral guide rail (17) is fixed to the top of the bracket (16), a lead screw is rotatably installed inside the lateral guide rail (17), a second motor (18) is fixed to one side of the lateral guide rail (17), the output end of the second motor (18) is connected to the lead screw, a moving block is threaded on the lead screw, a connecting rod is fixed on the moving block, and an angle adjustment assembly is fixed to the end of the connecting rod.

8. The pressure sensor metrological testing fixture according to claim 6, characterized in that, The angle adjustment assembly includes a housing (19), inside which is a ring-shaped electric track (20), on which a third motor (21) is fixed, and at the output end of the third motor (21) is a transmission wheel (22). A ball bearing (22) is rotatably disposed at one end of the housing (19) near the cylinder (14), and a mounting seat (23) is fixed on the ball bearing (22), and the mounting seat (23) is fixed to the cylinder (14).

9. The pressure sensor metrological testing fixture according to claim 8, characterized in that, The outer shell (19) has several through grooves on the peripheral wall corresponding to the ball (22). An electric telescopic rod (24) is fixed in the through groove. A locking block (25) is fixed at the output end of the electric telescopic rod (24). A rubber pad is provided on the surface of the locking block (25).

10. The pressure sensor metrological testing fixture according to claim 1, characterized in that, It also includes a PLC control unit, which is electrically connected to the clamping mechanism and the variable angle testing mechanism.

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