A pressure sensor calibration jig
By introducing a stress buffer design with a main cylinder-driven sealing cover and a buffer spring in the pressure sensor calibration fixture, as well as a modular cavity and probe fiberglass board structure, the problems of accuracy deviation and poor equipment versatility in traditional calibration technology are solved, and a high-precision and high-efficiency calibration process is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LONGWAY TECH WUXI
- Filing Date
- 2025-05-23
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional pressure sensor calibration techniques suffer from insufficient mechanical buffer design, making it difficult to completely eliminate stress interference. Furthermore, their low modularity leads to calibration accuracy deviations, poor equipment versatility, and high production costs.
A pressure sensor calibration fixture was designed, which uses a main cylinder to drive the sealing cover plate and the product pressure plate, combined with a buffer spring and guide rod structure to achieve stress buffering, and improves the equipment versatility through the modular design of detachable cavity modules and probe fiberglass plates.
It improves calibration accuracy, reduces additional stress variations, enhances equipment versatility, and reduces time and cost when changing models.
Smart Images
Figure CN224353975U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of pressure sensors, and in particular to a pressure sensor calibration fixture. Background Technology
[0002] With the rapid development of industrial automation, intelligent manufacturing and Internet of Things (IoT) technologies, pressure sensors, as core detection components in industrial equipment, smart terminals and IoT systems, have a significant impact on the performance stability and production efficiency of equipment due to their measurement accuracy and calibration efficiency.
[0003] Traditional pressure sensor calibration techniques typically employ manual or semi-automatic calibration methods. During the calibration process, external mechanical forces can easily be transmitted to the sensor's sensitive element, leading to deviations in calibration accuracy. Furthermore, calibration fixtures are often custom-designed for single products. When changing to different models, it is necessary to replace the entire machine or a large number of parts, which is time-consuming, labor-intensive, and has a low equipment reuse rate, significantly increasing production costs.
[0004] It is evident that current pressure sensor calibration technology still has limitations. Insufficient mechanical buffering design makes it difficult to completely eliminate stress interference, and low modularity limits the improvement of calibration efficiency. Therefore, there is an urgent need to provide a new pressure sensor calibration fixture to improve the problems of stress interference and poor equipment versatility in traditional technologies, and reduce overall costs. Utility Model Content
[0005] To address the shortcomings of low accuracy and poor equipment versatility in pressure sensor calibration technology, this application provides a pressure sensor calibration fixture.
[0006] This application provides a pressure sensor calibration fixture, which adopts the following technical solution:
[0007] A pressure sensor calibration fixture includes a base, a mounting plate on top of the base, a main cylinder on the mounting plate, a sealing cover plate connected to the output shaft of the main cylinder, a product pressure plate on the side of the sealing cover plate away from the main cylinder, a calibration assembly on the base located below the product pressure plate, and the calibration assembly including a sealing base plate, a probe circuit board, and a cavity module arranged sequentially from bottom to top. The sealing base plate is detachably connected to the base, one side of the probe circuit board is detachably connected to the sealing base plate, and the other side of the probe circuit board is detachably connected to the cavity module. The cavity module has an upper receiving groove, in which a probe fiberglass plate and a product support plate are disposed. A buffer spring is provided between the probe fiberglass plate and the probe circuit board, and the product support plate is detachably connected to the probe fiberglass plate.
[0008] By adopting the above technical solution, when calibrating the product, the product is placed on the product tray, the main cylinder is activated, and the output shaft of the main cylinder drives the sealing cover plate to move, and the product pressure plate moves downward, thereby calibrating the product. A buffer spring is installed between the probe fiberglass plate and the probe circuit board, so that the additional stress change when the product pressure plate presses on the product is buffered, thus improving the calibration accuracy. When it is necessary to change the product model, the cavity module, probe fiberglass plate and other parts can be disassembled and replaced with other modules, which improves the versatility of the equipment and overcomes the shortcomings of low accuracy and poor equipment versatility in pressure sensor calibration technology.
[0009] Optionally, the base is provided with a support rod, and the mounting plate is connected to the base through the support rod.
[0010] Optionally, a connecting plate is fixed on the output shaft of the main cylinder, and the sealing cover is connected to the bottom of the connecting plate.
[0011] Optionally, the base is provided with a guide rod, the guide rod is vertically arranged, and the connecting plate is provided with a guide ring, the guide ring being sleeved on the guide rod.
[0012] By adopting the above technical solution, the guide rod plays a guiding role for the connecting plate, sealing cover plate and product pressure plate, further improving the calibration accuracy.
[0013] Optionally, a guide cylinder is slidably connected to the guide rod, and a guide ring is sleeved on the guide cylinder, with the guide ring and the guide cylinder being fixed.
[0014] Optionally, the base is provided with a limiting cylinder, and a limiting block is connected to the output shaft of the limiting cylinder. The limiting block has a limiting groove on the side facing the guide rod.
[0015] By adopting the above technical solution, after calibration, the main cylinder is started, which drives the product cover plate to move upward. Then, the limit cylinder is started, and the limit block moves towards the guide rod under the drive of the limit cylinder output shaft until the guide rod abuts against the side wall of the limit groove, thereby restricting the movement of the product cover plate.
[0016] Optionally, the cavity module has a first sealing groove, and a first sealing ring is provided in the first sealing groove.
[0017] Optionally, a third sealing groove is provided on the sealing base plate, and a third sealing ring is provided in the third sealing groove, the third sealing ring abutting against the probe circuit board.
[0018] In summary, this application includes at least one of the following beneficial technical effects:
[0019] 1. When calibrating the product, place the product on the product tray, start the main cylinder, and the output shaft of the main cylinder drives the sealing cover to move, and the product pressure plate moves downward, thereby calibrating the product. A buffer spring is installed between the probe fiberglass plate and the probe circuit board to buffer the additional stress changes when the product pressure plate presses on the product, thus improving the calibration accuracy. When it is necessary to change the product model, the cavity module, probe fiberglass plate, etc. can be disassembled and replaced with other modules, which improves the versatility of the equipment and overcomes the shortcomings of low accuracy and poor equipment versatility in pressure sensor calibration technology.
[0020] 2. The guide rods guide the connecting plate, sealing cover plate, and product pressure plate, further improving calibration accuracy;
[0021] 3. After calibration, start the main cylinder to move the product cover plate upward. Then start the limit cylinder. The limit block moves towards the guide rod under the drive of the limit cylinder output shaft until the guide rod abuts against the side wall of the limit groove, thereby restricting the movement of the product cover plate. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of a pressure sensor calibration fixture according to an embodiment of this application.
[0023] Figure 2 This is a top view of a pressure sensor calibration fixture according to an embodiment of this application.
[0024] Figure 3 It is along Figure 2 A cross-sectional view along the AA direction.
[0025] Figure 4 yes Figure 3 Enlarged view of point B in the middle.
[0026] Figure 5 This is a schematic diagram of the calibration component in the embodiments of this application.
[0027] Explanation of reference numerals in the attached drawings: 1. Base; 2. Support rod; 3. Mounting plate; 4. Main cylinder; 5. Connecting plate; 6. Guide rod; 7. Guide cylinder; 8. Guide ring; 9. Limiting seat; 10. Limiting cylinder; 11. Limiting block; 12. Limiting groove; 13. Sealing cover plate; 14. Pressure plate groove; 15. Product pressure plate; 16. Cavity module; 17. First sealing ring; 18. Second sealing ring; 19. Product support plate; 20. Probe fiberglass board; 21. Probe circuit board; 22. Sealing base plate; 23. Third sealing ring; 24. Lower receiving groove; 25. Third sealing groove; 26. Upper receiving groove; 27. First sealing groove; 28. Second sealing groove. Detailed Implementation
[0028] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.
[0029] Example
[0030] This application discloses a pressure sensor calibration fixture.
[0031] Reference Figure 1 A pressure sensor calibration fixture includes a base 1, on which four support rods 2 are vertically mounted and fixedly connected to the four corners of the base 1. A mounting plate 3 is provided above the base 1, parallel to the base 1, and located at the top of the support rods 2. The support rods 2 are fixedly connected to the four corners of the bottom of the mounting plate 3.
[0032] Reference Figure 1 and Figure 2 The mounting plate 3 is equipped with a main cylinder 4, which is fixed to the mounting plate 3 by bolts (not shown in the figure). The output shaft of the main cylinder 4 passes through the mounting plate 3, and a connecting plate 5 is fixedly connected to the output shaft of the main cylinder 4. The connecting plate 5 is located between the base 1 and the mounting plate 3, and the output shaft of the main cylinder 4 passes through the connecting plate 5.
[0033] Reference Figure 1 A guide rod 6 is vertically mounted on the base 1, with one end of the guide rod 6 fixed to the base 1 by bolts. In this embodiment, there are two guide rods 6, symmetrically arranged along the axis of the base 1. A guide cylinder 7 is fitted onto each guide rod 6, and the guide cylinder 7 is slidably connected to the guide rod 6. Guide rings 8 are provided on both sides of the connecting plate 5, and the guide rings 8 are integrally formed with the connecting plate 5. The position of each guide ring 8 corresponds to one guide rod 6. The guide ring 8 is fitted onto the guide cylinder 7, and the guide cylinder 7 is fixed to the guide ring 8 by bolts (not shown in the figure).
[0034] Reference Figure 1 The base 1 has two limiting seats 9, each corresponding to a guide rod 6. The limiting seats 9 are fixed to the base 1 by bolts (not shown in the figure). A limiting cylinder 10 is fixedly connected to the limiting seat 9, and the output shaft of the limiting cylinder 10 is horizontally set. A limiting block 11 is fixedly connected to the output shaft of the limiting cylinder 10. A limiting groove 12 is opened on the side of the limiting block 11 facing the guide rod 6. The limiting groove 12 is arc-shaped, and the curvature of the limiting groove 12 is adapted to the curvature of the side wall of the guide rod 6.
[0035] Reference Figure 1 and Figure 3A sealing cover plate 13 is fixedly connected to the bottom of the connecting plate 5, and the sealing cover plate 13 is fixedly connected to the bottom of the output shaft of the main cylinder 4. A pressure plate groove 14 is provided at the bottom of the sealing cover plate 13, the opening of the pressure plate groove 14 faces downward, and a product pressure plate 15 is provided in the pressure plate groove 14. The product pressure plate 15 is fixedly connected to the sealing cover plate 13, and the bottom of the product pressure plate 15 is flush with the opening of the pressure plate groove 14.
[0036] Reference Figure 4 and Figure 5 A calibration assembly is provided on the base 1, located below the sealing cover 13. The calibration assembly includes a cavity module 16, a first sealing ring 17, a second sealing ring 18, a product support plate 19, a probe fiberglass plate 20, a probe circuit board 21, a sealing base plate 22, and a third sealing ring 23. The sealing base plate 22 is fixed to the base 1 by bolts (not shown in the figure). A lower receiving groove 24 is formed on the sealing base plate 22, with its opening facing upwards. A third sealing groove 25 is formed on the sealing base plate 22. The third sealing groove 25 is an annular groove with its opening facing upwards, surrounding the lower receiving groove 24. The third sealing ring 23 fills the third sealing groove 25.
[0037] Reference Figure 4 and Figure 5 The probe circuit board 21 is located above the sealing base plate 22 and is fixed to the sealing base plate 22 by bolts (not shown in the figure). The bottom of the probe circuit board 21 abuts against the third sealing ring 23. The cavity module 16 is located above the probe circuit board 21 and is fixed to the probe circuit board 21 by bolts (not shown in the figure).
[0038] Reference Figure 4 and Figure 5 The cavity module 16 has an upper receiving groove 26, which is a vertical through groove. The cavity module 16 also has a first sealing groove 27, which is an upward-opening annular groove surrounding the upper receiving groove 26. A first sealing ring 17 is filled within the first sealing groove 27. The cavity module 16 also has a second sealing groove 28, which is a downward-opening annular groove surrounding the upper receiving groove 26. A second sealing ring 18 is filled within the second sealing groove 28, and the bottom of the second sealing ring 18 abuts against the probe circuit board 21.
[0039] Reference Figure 4 and Figure 5The probe fiberglass plate 20 is located within the upper receiving groove 26 and is fixed to the probe circuit board 21 by bolts (not shown in the figure). A buffer spring (not shown in the figure) is provided between the probe fiberglass plate 20 and the probe circuit board 21. One end of the buffer spring is fixedly connected to the probe fiberglass plate 20, and the other end of the buffer spring is fixedly connected to the probe circuit board 21. The product tray 19 is located within the upper receiving groove 26, and the top of the product tray 19 is flush with the opening of the upper receiving groove 26. The product tray 19 is fixed to the probe fiberglass plate 20 by bolts (not shown in the figure).
[0040] The implementation principle of one embodiment of this application is as follows: When calibrating the product, the product is placed on the product tray 19, and the main cylinder 4 is activated. The output shaft of the main cylinder 4 drives the connecting plate 5 downward, and the sealing cover plate 13 and the product pressure plate 15 move downward accordingly, thereby calibrating the product. After calibration, the main cylinder 4 is activated, driving the connecting plate 5 upward. Then, the limiting cylinder 10 is activated, and the limiting block 11 moves towards the guide rod 6 under the drive of the output shaft of the limiting cylinder 10 until the guide rod 6 abuts against the side wall of the limiting groove 12, thereby restricting the movement of the connecting plate 5.
[0041] A buffer spring is installed between the probe fiberglass plate 20 and the probe circuit board 21 to buffer additional stress changes when the product pressure plate 15 presses onto the product, thereby improving calibration accuracy. When it is necessary to change the product model, the cavity module 16, probe fiberglass plate 20, and other parts can be disassembled and replaced with other modules, improving the equipment's versatility and overcoming the shortcomings of low accuracy and poor equipment versatility in pressure sensor calibration technology.
[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A pressure sensor calibration fixture, characterized in that: The system includes a base (1), a mounting plate (3) on top of the base (1), a main cylinder (4) on the mounting plate (3), a sealing cover plate (13) connected to the output shaft of the main cylinder (4), a product pressure plate (15) on the side of the sealing cover plate (13) away from the main cylinder (4), a calibration assembly on the base (1), the calibration assembly being located below the product pressure plate (15), the calibration assembly including a sealing base plate (22), a probe circuit board (21), and a cavity module (16) arranged sequentially from bottom to top. (22) It is detachably connected to the base (1). One side of the probe circuit board (21) is detachably connected to the sealing base plate (22), and the other side of the probe circuit board (21) is detachably connected to the cavity module (16). The cavity module (16) is provided with an upper receiving groove (26). The upper receiving groove (26) is provided with a probe fiberglass plate (20) and a product tray (19). A buffer spring is provided between the probe fiberglass plate (20) and the probe circuit board (21). The product tray (19) is detachably connected to the probe fiberglass plate (20).
2. The pressure sensor calibration fixture according to claim 1, characterized in that: The base (1) is provided with a support rod (2), and the mounting plate (3) is connected to the base (1) through the support rod (2).
3. The pressure sensor calibration fixture according to claim 1, characterized in that: A connecting plate (5) is fixed on the output shaft of the main cylinder (4), and the sealing cover plate (13) is connected to the bottom of the connecting plate (5).
4. A pressure sensor calibration fixture according to claim 3, characterized in that: The base (1) is provided with a guide rod (6), which is vertically arranged. The connecting plate (5) is provided with a guide ring (8), which is sleeved on the guide rod (6).
5. A pressure sensor calibration fixture according to claim 4, characterized in that: A guide cylinder (7) is slidably connected to the guide rod (6), and a guide ring (8) is sleeved on the guide cylinder (7). The guide ring (8) is fixed to the guide cylinder (7).
6. A pressure sensor calibration fixture according to claim 4, characterized in that: The base (1) is provided with a limiting cylinder (10), and a limiting block (11) is connected to the output shaft of the limiting cylinder (10). The limiting block (11) has a limiting groove (12) on the side facing the guide rod (6).
7. A pressure sensor calibration fixture according to claim 1, characterized in that: The cavity module (16) is provided with a first sealing groove (27), and a first sealing ring (17) is provided in the first sealing groove (27).
8. A pressure sensor calibration fixture according to claim 1, characterized in that: A third sealing groove (25) is provided on the sealing base plate (22), and a third sealing ring (23) is provided in the third sealing groove (25). The third sealing ring (23) abuts against the probe circuit board (21).