Pressure sensor test calibration tool

Abstract

The invention discloses a pressure sensor test calibration tool, and relates to the technical field of pressure sensor testing, the pressure sensor test calibration tool comprises a bottom plate and a top cover, the top of the bottom plate is provided with the top cover, and the bottom of the bottom plate is fixedly connected with a PCB; the air inlet mode of an original pressure sensor test calibration tool is innovatively improved, the arranged overload transmission mechanism can be matched with the pressure threshold value of the corresponding pressure sensor, pressurization ventilation is converted into single-side mechanical transmission inflation, the eccentric wheels rotate along with the rotating shaft, and the eccentric wheels located in the top cover synchronously work and do not affect one another; the sleeve disc rotates to achieve downward pressing movement of a piston rod connected with the side of the triangular rod, pressure is continuously given to a piston cavity communicated with an air nozzle of a pressure sensor, when the pressure sensor determines a safety threshold value, pressure release is actively conducted, a sliding rod upper pressing sleeve is pushed through a combined arm, and redundant pressure acts on an air cylinder; and the pressure sensor and the tool are protected from being damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure sensor testing, and in particular to a pressure sensor testing and calibration tool. Background Art

[0002] Pressure sensor test and calibration tooling is a key device to ensure the measurement accuracy of pressure sensors. It provides a standard pressure environment for pressure sensors and compares their output signals with standard values ​​for calibration. It usually consists of a pressure generating system, a standard pressure measuring device, connecting pipes and valves, and a signal acquisition and processing system. The pressure generating system generates different pressure values, which are applied to the pressure sensor and the standard pressure measuring device through the connecting pipes. The standard pressure measuring device provides high-precision pressure values ​​as a reference. The pressure sensor converts the sensed pressure into an electrical signal output. The signal acquisition and processing system collects and compares the two signals, calculates the deviation between the pressure sensor measurement value and the standard value, and calibrates and calibrates the pressure sensor through software algorithms to generate calibration curves or correction coefficients to compensate for measurement errors and improve measurement accuracy. As for the design of pressure sensor test and calibration tooling, which is used for compatible fixed detection of batch pressure sensors, as mentioned in the patent publication number CN218239165U, 32 pressure sensor cores can be tested online through the calibration tooling combination. At the same time, the pressure of each line can be controlled without affecting each other, and multiple types of sensors can be adapted by replacing the plate. However, the overall calibration tooling lacks overpressure protection. When the pressure exceeds the safety threshold set by the sensor or tooling, it cannot automatically cut off the pressure source or take pressure relief measures, resulting in damage to the pressure sensor and the tooling itself due to overpressure, affecting personnel operation and equipment safety. To this end, we propose a pressure sensor test and calibration tool. Summary of the Invention

[0003] The purpose of the present invention is to provide a pressure sensor testing and calibration tool to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a pressure sensor test and calibration tool, comprising a base plate and a top cover, wherein the top cover is mounted on the top of the base plate, a PCB is fixedly connected to the bottom of the base plate, a needle plate is mounted on the top of the base plate and located within the top cover, probes are evenly fixed to the bottom of the needle plate and extend to the bottom of the PCB, positioning bars are symmetrically mounted within the top cover, and the pressure sensor body is mounted in the grooves on both sides of the positioning bars; The top cover is evenly fixed with piston cavities, and the air vent at the bottom of the piston cavity is connected to the pressure sensor body. The inner wall of the bottom of the top cover is evenly installed with sealing sleeves, and the sealing sleeves are in contact with the pressure sensor body. An overload transmission mechanism is installed in the piston cavity.

[0005] Furthermore, a control box is fixed to one side of the top cover by bolts, and the inner walls on both sides of the top cover are symmetrically and movably connected with rotating shafts, and eccentric wheels are evenly sleeved and fixed on the rotating shafts. The output end of the motor installed in the control box passes through one side of the top cover and is correspondingly connected to the rotating shaft.

[0006] Furthermore, a sleeve disc is movably connected to the eccentric wheel, and a sliding rod is movably connected to one side of the sleeve disc.

[0007] Furthermore, the overload transmission mechanism includes a hanging plate, a piston column, a triangular rod and a combination arm. A triangular rod is movably connected to one side of the sleeve, and a hanging plate is movably connected on the triangular rod. The piston column is symmetrically installed on the bottom of the hanging plate, and the piston column is correspondingly slidably connected to the piston cavity. The triangular rod is movably connected to the sleeve. A combination arm is provided.

[0008] Furthermore, a through hole is provided on the central axis of the combined arm, one end of the slide rod passes through the through hole on the central axis of the combined arm and is fixedly connected to a fixed sleeve, and the outer wall of the slide rod is slidably connected to a press sleeve on one side of the combined arm.

[0009] Furthermore, a cylinder is fixed to one side of the fixed sleeve by bolts, one end of the cylinder is slidably connected to a sleeve column located in the fixed sleeve, and one side of the sleeve column passes through the groove on the fixed sleeve and abuts against the outer wall of the pressing sleeve.

[0010] Furthermore, positioning holes are correspondingly opened on the top cover, the positioning strip and the needle plate, positioning bolts are installed in the positioning holes, and a baffle is fixed to the side of the positioning strip by bolts.

[0011] The method of using the pressure sensor test and calibration tool is as follows: Assembly and debugging: remove the baffles on both sides of the bottom plate, fix the needle plate to the PCB board, and match the needle plate corresponding to the probe position with the pressure sensor; Place the pressure sensors one by one in the grooves inside the positioning strips, making sure that the pins of the pressure sensors are connected to the probes. Then place the top cover of the corresponding airway, secure the positioning bolts, and begin differential pressure and absolute pressure testing. During online detection, the cylinder in the top cover is matched with the safety pressure threshold of the measuring pressure sensor, the corresponding cylinder abuts the upper pressure limit, and the control box is used to drive the rotating shaft to rotate, accompanied by the rotation of multiple eccentric wheels. The movement of the sleeve pushes the piston column connected to the triangular rod to apply pressure to the piston chamber. Air is simultaneously introduced into both sides of the pressure sensor, and the internal sensitive elements produce deformation, displacement or other changes in physical quantities. The signals are transmitted through electrical signals to obtain the differential pressure value of the pressure sensor. One side of the pressure sensor is blocked, and the other side is ventilated to measure the absolute pressure of the pressure sensor.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, a top cover is installed on the original test plate, and the overload transmission mechanism provided can match the pressure threshold of the corresponding pressure sensor. The pressurized ventilation is converted into a single-sided mechanical transmission for pumping. As the shaft rotates, multiple sets of eccentric wheels located in the top cover work simultaneously, and the sleeve rotates to realize the downward movement of the piston rod connected to the triangular rod side, continuously giving pressure to the piston chamber connected to the end of the pressure sensor, continuously compressing the air while outputting the pressure sensor signal. At the same time, when the safety threshold of the pressure sensor is reached, the cylinder on the combined arm side is actively controlled to reduce the pressure, the sleeve rotation cannot continue to pressurize, and the sliding rod is pushed up by the combined arm to complete the automatic pressure relief work. At the same time, the subsequent detection of the pressure sensor on the shaft side is not affected. 2. The present invention mainly includes a base plate, a needle plate, a PCB board, a limit bar and a top cover. The test and calibration tooling has a simple structure and is easy to disassemble and install as a whole. It can perform online testing of 6 groups of pressure sensors at a time with high testing efficiency. The test and calibration of the tooling can greatly shorten the product testing cycle, so that the products on the production line can enter the next process faster, greatly improving production efficiency and reducing production costs. Moreover, the online detection method can obtain various performance data of the sensor in real time. Once the sensor is found to have abnormal performance, it can be screened and processed immediately, effectively avoiding the flow of unqualified products into subsequent production links, and effectively ensuring the stability and reliability of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the pressure sensor test and calibration tooling of the present invention; Figure 2 This is a schematic diagram of the disassembly of the baffle on the pressure sensor test and calibration tooling of the present invention; Figure 3 This is a schematic diagram of disassembling the top cover and top plate of the pressure sensor test and calibration tooling of the present invention; Figure 4 This is a schematic diagram of disassembling the top cover of the pressure sensor test and calibration tooling of the present invention; Figure 5 This is a schematic diagram of the connection structure between multiple groups of pressure sensor pins and the pin board of the present invention; Figure 6 This is a schematic diagram of the installation of the overload transmission mechanism on the piston chamber of the present invention; Figure 7 This is a schematic diagram of the sliding rod side connected to the cylinder structure of the present invention.

[0014] In the figure: 1. Base plate; 2. PCB board; 3. Needle plate; 4. Top cover; 5. Control box; 6. Positioning strip; 7. Positioning bolt; 8. Rotating shaft; 9. Eccentric wheel; 10. Piston chamber; 11. Sleeve disc; 12. Overload transmission mechanism; 121. Hanging plate; 122. Piston column; 123. Triangular rod; 124. Combined arm; 13. Sliding rod; 14. Cylinder; 15. Fixed sleeve; 16. Sleeve column; 17. Press sleeve. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] See also Figures 1-7 , the present invention provides a technical solution: Example 1: Figure 1 To perform the pressure sensor calibration test as shown, you need to prepare a high-precision pressure calibrator in advance as a standard pressure source to provide accurate known pressure values ​​for comparison and calibration of the pressure sensor under test. Prepare ventilation devices, such as air pumps, gas pipelines, valves, etc., to pass gases of different pressures into the pressure sensor. You also need to prepare data acquisition equipment, such as digital multimeters and data acquisition cards, to record the output signal of the pressure sensor. Correctly install the pressure sensor on the test interface of the ventilation device, ensure that the connection is firm and there is no gas leakage. According to the sensor's instruction manual, connect the sensor's power supply and signal output lines, connect it to the data acquisition equipment, and select a test environment with relatively stable temperature and humidity, and without strong electromagnetic interference and vibration. The present invention improves the existing ventilation pipeline by ventilating both ends of the pressure sensor, with one end using mechanical transmission to increase pressure. Compared with ventilation with air pumps at both ends, when the pressure sensor reaches the safety threshold, it is impossible to quickly cut off the pressure source or automatically release the pressure. The pressure sensor and the tooling itself are damaged due to overpressure, resulting in large errors in the subsequently collected data. like Figure 3 and Figure 4 As shown, the control box 5 is installed on the side of the top cover 4. The driving component in the control box 5 controls the rotation of the rotating shaft 8 in the top cover 4. A plurality of eccentric wheels 9 are arranged on the rotating shaft 8 and corresponding to the fixed pressure sensor at the bottom. The eccentric wheels 9 are provided with a mounting sleeve 11. Figure 6 As shown, the overload transmission mechanism 12 is installed on the sleeve 11 side; Here is a detailed description of the pressurized overload adjustment, in which the overload transmission mechanism 12 is mainly composed of a triangular rod 123, one end of the triangular rod 123 is movably connected to the sleeve disc 11, and the other side is movably connected to a combined arm 124, the bent end of the combined arm 124 is movably connected to the sleeve disc 11, and a sliding rod 13 is slidably connected to the rotation center of the combined arm 124. The end of the sliding rod 13 is movably connected to the triangular rod 123 and the sleeve disc 11. With the rotation of the rotating shaft 8, the rotation of the eccentric wheel 9 realizes the up and down movement of the sleeve disc 11, thereby pushing the entire triangular rod 123 and the hanging plate 121 connected to the triangular rod 123 to move; A piston rod is symmetrically fixed to the bottom of the hanging plate 121. The piston rod is slidably connected to the piston chamber 10. As the piston rod slides downward, the connected pressure sensor is continuously pressurized. The air pump located at the other air inlet of the pressure sensor is ventilated. The two simultaneously apply pressure to the pressure sensor, causing the internal sensitive element to deform, displace, or change in other physical quantities. These changes are then converted into electrical signals for transmission, thereby obtaining the differential pressure value of the pressure sensor. The entire slide bar 13 is also provided with a press sleeve 17. Figure 7 As shown, a fixed sleeve 15 is fixed to the end of the slide rod 13, and a cylinder 14 is installed on the side of the fixed sleeve 15. The cylinder 14 can adjust the fixed air pressure. A sleeve column 16 is slidably connected to the side of the cylinder 14. The end of the sleeve column 16 extends through the groove on the outer wall of the fixed sleeve 15 and abuts against the pressure sleeve 17. When the eccentric wheel 9 drives the sleeve disc 11 to rotate, it will also apply pressure to the combined arm 124, causing the combined arm 124 to bend. At the same time, the pressing sleeve 17 on the side of the slide rod 13 is squeezed, and the pressing sleeve 17 is squeezed to push the sleeve column 16, which is connected to the cylinder 14. After the internal pressure value of the cylinder 14 is set, the combined arm 124 cannot squeeze the sleeve column 16 through the pressing sleeve 17, causing the sleeve disc 11 to squeeze the piston rod downward as a whole, continuously pressurizing and ventilating the pressure sensor; When the safety threshold set by the cylinder 14 is reached, the rotation of the sleeve disc 11 exerts pressure on the combined arm 124 to push the pressing sleeve 17 to move, and the sleeve column 16 slides inside the cylinder 14. The rotation of the eccentric wheel 9 can no longer drive the piston rod to continuously press down the air in the piston chamber 10, but the eccentric wheel 9 as a whole is not affected. The eccentric wheel 9 with limited pressurization rotates on its own, and other pressure sensors that have not reached the safety threshold of the cylinder 14 can still be pressurized by the rotation of the eccentric wheel 9. It should be noted that the air pressure value set in the cylinder 14 can be automatically adjusted according to the measurement threshold of the pressure sensor. The pressure sensor is pressurized on one side through mechanical transmission, and the cylinder 14 is used as a buffer. When the pressure sensor reaches the critical measurement value, the mechanical structure moves to realize the pressure transfer, preventing the pressure sensor and the tooling itself from being damaged due to overpressure, thereby ensuring the safety of personnel and equipment. The damage to the calibration tooling here is mostly due to the loosening of the sealing gasket at the connection position.

[0017] Example 2: The pressure sensor is placed in the test and calibration tooling, such as Figure 1 As shown, the tooling is assembled in a composite manner. The top is a top cover 4, and the bottom of the top cover 4 is a specially designed positioning bar 6. The positioning bar 6 is customized and molded according to the shape of the pressure sensor. The notches on both sides are similar to the shape of the pressure sensor, which facilitates the placement and fixation of the pressure sensor. Secondly, the needle plate 3 is installed at the bottom of the positioning strip 6, and the corresponding probe is installed on the needle plate 3. The PCB board 2 is also fixed on the bottom plate 1. According to the one-to-one corresponding through-hole positions on the PCB board 2 and the needle plate 3, the needle plate 3 is fixed to the PCB board 2 with screws. After the pressure sensor is placed in the groove of the product positioning strip 6, the pressure sensor positioning strip 6 is aligned and limited by the positioning bolt 7 so that the pin of the pressure sensor is in full contact with the probe on the needle plate 3. The baffle can be fixed to both sides of the product positioning strip 6 at any time to further fix the pressure sensor so that it will not move or even fall off from the product positioning strip 6 when the tooling is shaken, resulting in incomplete contact between the pin of the pressure sensor and the tooling probe, resulting in communication abnormalities during detection. The air nozzle on the top cover 4 corresponds one-to-one to the air nozzle of the pressure sensor to ensure that when the tooling is ventilated, the air can be accurately supplied to the pressure sensor; When performing absolute pressure measurement at the same time, the piston column 122 is also used to press down and add gas, while the air nozzle on the other side is in a blocked state. This tooling can measure products with two different pressurization forms, absolute pressure and differential pressure, and has a wider application.

[0018] The working principle of the present invention is as follows: the pressure sensors are installed in batches on the calibration tooling, the baffles on both sides of the base plate 1 are removed, and then the needle plate 3 is fixed to the PCB board 2, and the needle plate 3 corresponding to the probe position is matched with the pressure sensor pin; Place the pressure sensors one by one in the grooves inside the positioning strips 6, making sure that the pins of the pressure sensors are connected to the probes. Then place the top cover 4 of the corresponding airway, secure the positioning bolts 7, and start the pressure differential and absolute pressure testing. The cylinder 14 in the top cover 4 is matched with the safety pressure threshold of the measuring pressure sensor, and the corresponding cylinder 14 is adjusted to abut the upper pressure limit. The control box 5 is used to drive the rotating shaft 8 to rotate, accompanied by the rotation of multiple eccentric wheels 9. The movement of the sleeve 11 pushes the piston column 122 connected to the triangular rod 123 to apply pressure to the piston chamber 10. Air is taken in from both sides of the pressure sensor at the same time, and the internal sensitive elements produce deformation, displacement or other changes in physical quantities. The signals are transmitted through electrical signals to obtain the differential pressure value of the pressure sensor. One side of the pressure sensor is blocked, and the other side is ventilated to measure the absolute pressure of the pressure sensor.

[0019] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pressure sensor test and calibration tool, comprising a base plate (1) and a top cover (4), characterized in that: A top cover (4) is installed on the top of the base plate (1), a PCB board (2) is fixedly connected to the bottom of the base plate (1), a needle plate (3) is installed on the top of the base plate (1) and located inside the top cover (4), probes are evenly fixed on the bottom of the needle plate (3) and extend to the bottom of the PCB board (2), positioning strips (6) are symmetrically installed inside the top cover (4), and pressure sensor bodies are installed in the grooves on both sides of the positioning strips (6); A piston cavity (10) is evenly fixed in the top cover (4), and a vent at the bottom of the piston cavity (10) is connected to the pressure sensor body. A sealing sleeve is evenly installed on the inner wall of the bottom of the top cover (4), and the sealing sleeve abuts against the pressure sensor body. An overload transmission mechanism (12) is installed in the piston cavity (10).

2. A pressure sensor test and calibration tool according to claim 1, characterized in that: A control box (5) is fixed to one side of the top cover (4) by bolts, and rotating shafts (8) are symmetrically and movably connected to the inner walls of both sides of the top cover (4), and eccentric wheels (9) are evenly sleeved and fixed on the rotating shafts (8). The output end of the motor installed in the control box (5) passes through one side of the top cover (4) and is correspondingly connected to the rotating shafts (8).

3. A pressure sensor test and calibration tool according to claim 2, characterized in that: A sleeve disc (11) is movably connected to the eccentric wheel (9), and a sliding rod (13) is movably connected to one side of the sleeve disc (11).

4. A pressure sensor test and calibration tool according to claim 3, characterized in that: The overload transmission mechanism (12) comprises a hanging plate (121), a piston column (122), a triangular rod (123) and a combination arm (124); one side of the sleeve disc (11) is movably connected to the triangular rod (123); the triangular rod (123) is sleeved with a hanging plate (121) movably connected thereto; the bottom of the hanging plate (121) is symmetrically mounted with a piston column (122); the piston column (122) is correspondingly slidably connected to the piston chamber (10); and the triangular rod (123) is movably connected to the combination arm (124) on the sleeve disc (11).

5. The pressure sensor test and calibration tool according to claim 4, characterized in that: A through hole is provided on the central axis of the combination arm (124); one end of the slide rod (13) passes through the through hole on the central axis of the combination arm (124) and is fixedly connected to a fixed sleeve (15); and a pressing sleeve (17) is slidably provided on the outer wall of the slide rod (13) and located on one side of the combination arm (124).

6. A pressure sensor test and calibration tool according to claim 5, characterized in that: A cylinder (14) is fixed to one side of the fixed sleeve (15) by means of bolts, and a sleeve column (16) is slidably connected to one end of the cylinder (14) and is located inside the fixed sleeve (15). One side of the sleeve column (16) passes through the upper groove of the fixed sleeve (15) and abuts against the outer wall of the pressing sleeve (17).

7. The pressure sensor test and calibration tool according to claim 1, characterized in that: Positioning holes are correspondingly provided on the top cover (4), the positioning strip (6) and the needle plate (3), positioning bolts (7) are installed in the positioning holes, and a baffle is fixed to the side of the positioning strip (6) by bolts.

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