Pressure sensor metering test fixture

Abstract

The invention discloses a pressure sensor metering test fixture, and relates to the field of metering test, the metering test fixture is configured to be an automatic test fixture system used for realizing automatic feeding, clamping and multi-dimensional pressure test of a pressure sensor, and the automatic test fixture system comprises a fixing jig, a feeding mechanism, a grabbing manipulator and a test mechanism, the fixing jig is used for fixing a pressure sensor to be tested; the feeding mechanism is used for achieving jacking conveying of the fixing jig. The grabbing manipulator is used for grabbing the fixed jig from the jig bearing disc; the testing mechanism is used for executing automatic multi-step pressure calibration testing on the fixed to-be-tested pressure sensor; according to the measuring and testing clamp, the fixing jig, the feeding mechanism, the grabbing mechanical arm and the testing mechanism are integrated, integrated equipment integrating automatic feeding, precise clamping, multi-station testing and automatic circulation is constructed, and full-process automation and intellectualization of pressure sensor measuring and testing are achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of metrological testing, and particularly relates to a pressure sensor metrological testing fixture. BACKGROUND

[0002] As a core device for sensing pressure signals and converting them into measurable electrical signals, pressure sensors are widely used in many fields such as automotive electronics, industrial automation, aerospace, medical equipment, consumer electronics, etc. The measurement accuracy, reliability and stability of pressure sensors directly affect the performance and safety of terminal equipment. In the research, production and application process of pressure sensors, it is necessary to quantitatively analyze and calibrate various performance indicators (such as linearity, hysteresis, repeatability, sensitivity, zero drift, etc.) of pressure sensors through strict metrological testing, so as to ensure that they meet the design requirements and use standards.

[0003] Traditional pressure sensor metrological testing mainly relies on manual operation or semi-automatic equipment to complete, and its typical process includes: manually placing the sensor in the test fixture, fixing the sensor through mechanical structure or manual clamp, applying standard pressure to the sensor by pressure loading equipment (such as air source, hydraulic pump, etc.), and then acquiring the sensor output signal through the data acquisition system and performing metrological analysis. Such traditional methods have the problems of low efficiency in feeding and fixing, low automation degree and limited multi-dimensional pressure testing capability.

[0004] In order to solve the above problems, a variety of improved schemes have been disclosed in the industry, including the following:

[0005] 1) The patent application CN117268627A discloses a pressure sensor metrological testing fixture, which includes a test table plate, a clamping assembly, an arc-shaped plate, a pressurizing assembly and a driving mechanism. The center of the test table plate is provided with two symmetrically distributed clamping assemblies for clamping the pressure sensor to be tested. The arc-shaped plate is arranged above the clamping assembly, and the pressurizing assembly is provided with a plurality of pressurizing assemblies which are uniformly distributed on the arc-shaped plate. The pressurizing assembly is used to apply pressure to the pressure sensor. The driving mechanism is arranged in the internal cavity of the test table plate. The driving mechanism drives the arc-shaped plate to rotate, and the arc-shaped plate drives the plurality of pressurizing assemblies on it to rotate, so that pressure can be applied to the pressure sensor in different directions, improving the accuracy of the test, and solving the problem that the existing test fixture has a single test direction and can only apply pressure to the pressure sensor in the vertical direction, which is not ideal in terms of test accuracy.

[0006] 2) Patent No. CN113624398B discloses a test fixture for a pressure sensor. In this patent application, a base, a clamping assembly, and a lifting assembly are included. The clamping assembly is located above the base. The clamping assembly includes a horizontally placed upper cover plate and a carrier plate. The carrier plate is located below the upper cover plate. The upper cover plate is fixed to the base by a plurality of support columns. The lifting assembly is fixed to the base. Specifically, a plurality of evenly distributed air inlets are formed in the upper cover plate. A printed circuit board is fixedly arranged on the carrier plate. A plurality of to-be-tested sensors corresponding to the positions of the air inlets are connected to the printed circuit board. The printed circuit board can amplify and transmit the measurement signals of the to-be-tested sensors. The carrier plate can move horizontally and vertically relative to the upper cover plate. When the carrier plate moves horizontally, the carrier plate does not contact the lifting assembly. The carrier plate moves vertically by the pushing of the lifting assembly. In this way, batch detection is realized, and the detection accuracy is improved.

[0007] 3) Patent No. CN115824493A discloses a fixture for measuring and testing a pressure sensor. In this patent application, a base is included. The base places a pressure sensor. A plurality of bosses are fixed to the upper side of the base. A first electric push rod is installed on the upper side of the boss. The extension end of the first electric push rod is upwardly arranged and jointly installs a weight disc. The bottom surface of the weight disc corresponds to the top surface of the pressure sensor. A plurality of extension holes are formed in the base near the bosses. A clamping assembly is movably arranged at each extension hole. The plurality of clamping assemblies jointly clamp and position the pressure sensor. A second electric push rod is installed on the bottom surface of the base. The extension end of the second electric push rod is downwardly arranged and installs a lifting frame. The end of the lifting frame away from the second electric push rod is connected to the lower side of the clamping assembly. The present application can efficiently and quickly clamp and position different models and sizes of pressure sensors. The clamping effect is more stable. The detection operation process is also more simple and convenient.

[0008] The above-mentioned prior art can solve the problems of single test direction, batch detection, improved clamping adaptability, and simplified operation process through different technical paths. However, none of them forms a complete automatic test solution. There are still the following limitations: First, these solutions do not realize the full-process automation integration from sensor feeding, accurate positioning, multi-dimensional pressure loading to data acquisition. They rely on more manual intervention, and the test efficiency cannot meet the large-scale production demand. Second, the existing fixtures have insufficient compatibility for multiple types and sizes of sensors. The model change adjustment process is complex and time-consuming.

[0009] Therefore, there is an urgent need in the industry for a comprehensive test fixture that can realize full-process automation and high-precision pressure testing. SUMMARY

[0010] The present application aims to provide a pressure sensor metrological test fixture to solve the problem of low feeding and fixing efficiency and lack of full-process integrated test caused by relying on manual operation in the prior art.

[0011] To achieve the above-mentioned purpose, the present application provides the following technical solution: a pressure sensor metrological test fixture, the metrological test fixture is configured to be used for realizing an automatic test fixture system of automatic feeding, clamping and multi-dimensional pressure test of a pressure sensor, the automatic test fixture system comprises a fixing jig, a feeding mechanism, a grabbing manipulator and a test mechanism, wherein:

[0012] The fixing jig is used for fixing the pressure sensor to be tested, and the fixing jig comprises a tray and a plurality of jig units distributed at intervals along the end face of the tray, each jig unit being used for independently fixing one pressure sensor to be tested;

[0013] The feeding mechanism is used for realizing the jacking and conveying of the fixing jig, and the feeding mechanism comprises a feeding machine table, guide columns, a feeding sliding table and a jig bearing disc, the guide columns and the feeding sliding table are arranged on the end face of the feeding machine table, the guide columns are arranged in a ring shape and a plurality of guide columns are arranged on one side of the feeding sliding table, and the sliding end of the feeding sliding table is connected with the jig bearing disc; the outer side of the jig bearing disc is provided with guide holes in sliding connection with the guide columns, and a plurality of fixing jigs are stacked on the jig bearing disc;

[0014] The grabbing manipulator is used for grabbing the fixing jig from the jig bearing disc, and the grabbing manipulator comprises a grabbing sliding table, a base, a lifting electric cylinder and a grabbing manipulator arm;

[0015] The test mechanism is used for performing automatic multi-step sequence pressure calibration test on the fixed pressure sensor to be tested, and the test mechanism comprises a test machine table, a first sliding table, a first test module, a second sliding table, a second test module, a third sliding table and a servo turntable, the test machine table is arranged side by side with the feeding machine table, the first sliding table and the second sliding table are arranged on the rear side of the end face of the test machine table, and the third sliding table is arranged on the front side of the end face of the test machine table.

[0016] Preferably, the jig unit comprises a telescopic push rod, a mounting seat, a lateral fixing arm, a linkage plate and a bottom support plate, the telescopic push rod is fixed on the tray, the mounting seat is arranged on the outer side of the telescopic push rod, and the shaft end of the telescopic push rod is connected with the linkage plate.

[0017] Preferably, the lateral fixing arm is provided with a plurality of groups and is hinged to the outer side of the mounting seat through elastic hinge shafts, the outer periphery of the linkage plate is provided with guide limiting grooves corresponding in number and position to the lateral fixing arms, and the lateral fixing arms are inwardly folded and clamp and fix the outer side end of the pressure sensor to be tested when the linkage plate moves with the telescopic push rod.

[0018] Preferably, the linkage plate top center is mounted with a bottom support plate for supporting the bottom of the pressure sensor. The jig unit is a separate modular unit that can be installed in batches on the tray. By controlling the stroke of the telescopic push rod, the folding range of the lateral fixing arm can be adjusted to adapt to pressure sensors of different sizes. This design allows the entire test system to quickly switch between different product models without changing the fixture, greatly enhancing the flexibility and production efficiency of the production line.

[0019] Preferably, the tray outside of the fixed jig is provided with a guide groove matched with the guide column, and the jig bearing plate moves up and down with the loading slide and aligns with the material taking position layer by layer, so that the uppermost fixed jig is at a fixed height reachable by the grabbing manipulator, realizing automatic feeding. The jig bearing plate can stack multiple fixed jigs and realize layer-by-layer jacking through the control of the loading slide. This design allows the system to provide multiple units to be tested within a single loading cycle, realizing batch storage and single-piece supply delivery mode. It converts discrete and frequent manual loading operations into centralized and automatic continuous feeding, greatly reducing equipment waiting time and ensuring efficient and uninterrupted operation of the test process.

[0020] Preferably, the grabbing slide is horizontally arranged and connected to the loading machine table through the rack at the bottom end, a base is arranged on the sliding end of the front side of the grabbing slide, a lifting electric cylinder is installed at the front end of the base, and the shaft end of the lifting electric cylinder is connected to the grabbing manipulator. The coordinated action of the grabbing manipulator and the lifting electric cylinder (synchronously driven by the control system) supports the full-process automation of grabbing, translation, and placement of the fixed jig without human intervention, significantly improving the efficiency and reliability of the loading link.

[0021] Preferably, the first test module and the second test module are respectively connected to the sliding end of the first slide and the second slide, the first test module is used to perform rapid pre-pressing and initial zero-point calibration, and the second test module is used to perform standard pressure cycle and data acquisition. The first test module focuses on rapid pre-pressing and initial zero-point calibration, by applying a pre-set small range of pressure (usually 5% to 10% of the sensor range) and recording the initial output signal, the zero-point drift caused by transportation, installation or environmental changes of the sensor is eliminated, and a reference is established for subsequent high-precision testing; The second test module performs standard pressure cycle (covering multiple pressure values in the full range) and real-time data acquisition to obtain the linearity, hysteresis, repeatability and other core performance indicators of the sensor, realizing a complete test link from basic calibration to comprehensive performance evaluation.

[0022] Preferably, the servo turntable is arranged on the sliding end of the third sliding table, and a negative pressure suction disc surface for carrying and positioning the fixing jig is arranged on the servo turntable, and the servo turntable is used for transferring the fixing jig to the test station and cooperating with the first test module and the second test module to perform pre-pressing calibration and testing. As the core transfer mechanism, the servo turntable is driven by the third sliding table to move along the linear track, and can carry the fixing jig carrying the sensor to be tested to the first test module (pre-pressing calibration station) and the second test module (standard pressure cycle test station) in sequence, realizes seamless connection of key links such as feeding, pre-pressing and testing, avoids manual intervention or complex mechanical transmission, and improves the continuity and automation level of the overall test process. In addition, combined with the rotation indexing function of the servo turntable, the plurality of jig units distributed in a circle can be accurately reached in sequence to the test station of the first test module or the second test module, realizing single sensor testing or batch sensor synchronous and orderly testing, and maximizing the test efficiency.

[0023] Compared with the prior art, the present application has the following beneficial effects: the present application integrates the fixing jig, the feeding mechanism, the grabbing manipulator and the test mechanism to construct an integrated device integrating automatic feeding, accurate clamping, multi-station testing and automatic flow, realizing full-process automation and intelligentization of pressure sensor measurement testing. The system can not only significantly improve the test efficiency and consistency, but also effectively reduce the labor cost and operation error. The specific technical effects include the following:

[0024] 1. The jig carrying disc of the feeding mechanism stacks multiple fixing jigs, cooperates with the grabbing manipulator to take and move each jig to the servo turntable, and then through the rotation indexing function of the servo turntable, each jig unit distributed in a circle can pass through the first test module and the second test module in sequence, realizing continuous testing of the whole disc of sensors with single feeding.

[0025] 2. The jig unit drives the linkage plate through the telescopic push rod to control multiple groups of lateral fixing arms to be folded synchronously, forming self-adaptive envelope clamping of the sensor shape, which can reliably fix products of different sizes and specifications, and can avoid sensor deformation or damage caused by rigid clamping force, and has strong universality and safety and reliability.

[0026] 3. The test mechanism performs rapid pre-pressing and initial zero-point calibration through the first test module to eliminate the initial state deviation of the sensor, and then performs standard pressure cycle and data acquisition through the second test module, combined with the rotation indexing function of the servo turntable, each jig unit can accurately reach the test station, realizing synchronous testing and data association of batch sensors. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only represent some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained based on these drawings.

[0028] Figure 1 Structure schematic view of the fixing jig in the first embodiment of the present application;

[0029] Figure 2 Structure schematic view of the jig unit in the first embodiment of the present application;

[0030] Figure 3 Structure schematic view of the second embodiment of the present application;

[0031] Figure 4 Structure schematic view of the feeding mechanism and the grabbing manipulator in the second embodiment of the present application;

[0032] Figure 5 Structure schematic view of the testing mechanism in the second embodiment of the present application;

[0033] Figure 6 Structure schematic view of the third sliding table and the servo turntable in the second embodiment of the present application.

[0034] In the drawings:

[0035] 1, fixing jig; 101, tray; 102, telescopic push rod; 103, mounting seat; 104, lateral fixing arm; 105, linkage plate; 106, bottom supporting plate;

[0036] 2, feeding mechanism; 201, feeding table; 202, guide column; 203, feeding sliding table; 204, jig bearing disc;

[0037] 3, grabbing manipulator; 301, grabbing sliding table; 302, base; 303, lifting electric cylinder; 304, grabbing mechanical arm;

[0038] 4, testing mechanism; 401, testing table; 402, first sliding table; 403, first testing module; 404, second sliding table; 405, second testing module; 406, third sliding table; 407, servo turntable. DETAILED DESCRIPTION

[0039] In order to make those skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail with reference to the drawings.

[0040] As shown in the drawings: Figure 1 to the drawings: Figure 2 As shown in the drawings:

[0041] Embodiment one: the application provides a pressure sensor measurement test fixture, the measurement test fixture comprises a fixed jig 1 for fixing a pressure sensor to be measured, the fixed jig 1 comprises a tray 101 and a plurality of jig units distributed at intervals along the end face of the tray 101, each jig unit is used for independently fixing one pressure sensor to be measured; the jig unit comprises a telescopic push rod 102, a mounting seat 103, a lateral fixing arm 104, a linkage plate 105 and a bottom support plate 106, the telescopic push rod 102 is fixed on the tray 101, the mounting seat 103 is arranged outside the telescopic push rod 102, and the shaft end of the telescopic push rod 102 is connected with the linkage plate 105.

[0042] 1. In an embodiment of the application, the lateral fixing arm 104 is provided with a plurality of groups and is hinged to the outside of the mounting seat 103 through an elastic hinge shaft, the outer periphery of the linkage plate 105 is provided with a guide limiting groove corresponding in number and position to the lateral fixing arm 104, and the lateral fixing arm 104 is inwardly folded and clamps and fixes the outer side end of the pressure sensor to be measured when the linkage plate 105 moves with the telescopic push rod 102.

[0043] 2. In an embodiment of the application, the bottom support plate 106 is installed at the top center of the linkage plate 105 and is used for supporting the bottom of the pressure sensor. The jig unit serves as an independent modular unit and can be installed in batches on the tray 101. By controlling the stroke of the telescopic push rod 102 through a program, the folding range of the lateral fixing arm 104 can be adjusted, so as to adapt to pressure sensors of different shapes and sizes. This design enables the whole test system to quickly switch the test product model without replacing the fixture, greatly enhancing the flexibility and production efficiency of the production line.

[0044] Working principle: In example one, the design of the modular and adaptive clamping mechanism realizes efficient, non-destructive and reliable synchronous fixation of multiple sensors. The specific work includes the following: when the sensor needs to be fixed, the telescopic push rod 102 is started, the shaft end pushes the linkage plate to move upward, the guide limiting groove on the outer periphery of the linkage plate rises synchronously, the groove cooperates with the lateral fixing arm 104 installed outside the mounting seat 103 through the elastic hinge shaft; under the constraint and guidance of the guide limiting groove, multiple groups of lateral fixing arms 104 overcome the slight resistance of the elastic hinge shaft and produce synchronous and centripetal rotary motion, and are stably folded to the center. Finally, all the lateral fixing arms 104 simultaneously contact and cover the outer side of the sensor to be measured from all around, forming a uniform clamping force field and stably clamping the sensor in the center. At the same time, the bottom support plate 106 fixed on the top center of the linkage plate rises and supports the bottom of the sensor, thereby realizing the overall positioning and fixation of the sensor from all around and the bottom. This clamping method can effectively avoid the deformation or test error of the sensor caused by single-point stress concentration or eccentric clamping. When the test is completed and the material needs to be unloaded, the telescopic push rod 102 is retracted, the linkage plate is pulled down, the lateral fixing arms 104 are opened outward under the guidance of the guide limiting groove and the action of the elastic hinge shaft, and the clamping of the sensor is released, so that the sensor can be conveniently taken out. By controlling the stroke of the telescopic push rod 102 through programming, the folding range of the lateral fixing arms 104 can be accurately adjusted, so that the jig unit can quickly adapt to sensors of different shapes and sizes.

[0045] As shown in the accompanying drawings Figure 3 to the accompanying drawings Figure 6 as shown:

[0046] In this embodiment, the metering test fixture is configured as an automatic test fixture system for automatic loading, clamping and multi-dimensional pressure testing of the pressure sensor, which comprises a fixed jig 1, a loading mechanism 2, a grabbing manipulator 3 and a testing mechanism 4. The fixed jig 1 is used for fixing the pressure sensor to be tested, and comprises a tray 101 and a plurality of jig units distributed at intervals along the end face of the tray 101. Each jig unit is used for independently fixing one pressure sensor to be tested. The loading mechanism 2 is used for lifting and conveying the fixed jig 1. The loading mechanism 2 comprises a loading table 201, guide columns 202, a loading sliding table 203 and a jig bearing disc 204. The guide columns 202 and the loading sliding table 203 are arranged on the end face of the loading table 201. The guide columns 202 are arranged in a ring shape, and the loading sliding table 203 is arranged on one side of the guide columns 202. The sliding end of the loading sliding table 203 is connected to the jig bearing disc 204. The jig bearing disc 204 is provided with guide holes matched with the guide columns 202, and a plurality of fixed jigs 1 are stacked on the jig bearing disc 204. The grabbing manipulator 3 is used for grabbing the fixed jig 1 from the jig bearing disc 204. The grabbing manipulator 3 comprises a grabbing sliding table 301, a base 302, a lifting cylinder 303 and a grabbing manipulator arm 304. The testing mechanism 4 is used for performing automatic multi-step pressure calibration testing on the fixed pressure sensor to be tested. The testing mechanism 4 comprises a testing table 401, a first sliding table 402, a first testing module 403, a second sliding table 404, a second testing module 405, a third sliding table 406 and a servo turntable 407. The testing table 401 is arranged side by side with the loading table 201. The first sliding table 402 and the second sliding table 404 are arranged on the rear side of the end face of the testing table 401. The third sliding table 406 is arranged on the front side of the end face of the testing table 401.

[0047] 1. In an embodiment of the present application, the tray 101 of the fixed jig 1 is provided with guide grooves matched with the guide columns 202. The jig bearing disc 204 moves up and down with the loading sliding table 203 and aligns with the material taking positions layer by layer, so that the uppermost fixed jig 1 is at a fixed height reachable by the grabbing manipulator 3, thereby realizing automatic feeding. The jig bearing disc 204 can stack a plurality of fixed jigs 1, and realizes layer-by-layer lifting through the control of the loading sliding table 203. This design enables the system to provide a plurality of units to be tested in a single feeding cycle, realizes batch storage and single-piece feeding mode. It converts discrete and frequent manual feeding operation into centralized and automatic continuous feeding, greatly reduces the waiting time of the equipment, and ensures efficient and uninterrupted operation of the test process.

[0048] 2、In an embodiment of the present application, the material grabbing sliding table 301 is arranged transversely and its bottom end is connected with the feeding machine table 201 through the frame, a base 302 is arranged on the sliding end of the front side of the material grabbing sliding table 301, a lifting electric cylinder 303 is installed at the front end of the base 302, and the shaft end of the lifting electric cylinder 303 is connected with a material grabbing mechanical arm 304. The material grabbing mechanical arm 304 and the lifting electric cylinder 303 cooperatively act (synchronously driven by a control system) to support the whole process automation of grabbing, translation and placement of the fixed jig 1, without manual intervention, thereby significantly improving the efficiency and reliability of the feeding link.

[0049] 3、In an embodiment of the present application, the first test module 403 and the second test module 405 are respectively connected with the sliding ends of the first sliding table 402 and the second sliding table 404, the first test module 403 is used for executing rapid pre-pressing and initial zero-point calibration, and the second test module 405 is used for executing standard pressure cycle and data acquisition. The first test module 403 focuses on rapid pre-pressing and initial zero-point calibration, by applying a preset small range of pressure (usually 5% to 10% of the sensor range) and recording the initial output signal, the zero-point drift of the sensor caused by transportation, installation or environmental changes is eliminated, and a benchmark is established for subsequent high-precision testing; the second test module 405 executes standard pressure cycle (covering multiple pressure values in the full range) and real-time data acquisition, which is used for obtaining the linearity, hysteresis, repeatability and other core performance indicators of the sensor, and realizes a complete test link from basic calibration to comprehensive performance evaluation.

[0050] 4、In an embodiment of the present application, the servo turntable 407 is arranged on the sliding end of the third sliding table 406, and a negative pressure suction disc surface for carrying and positioning the fixed jig 1 is arranged on the servo turntable 407. The servo turntable 407 is used for transferring the fixed jig 1 to the test station and cooperating with the first test module 403 and the second test module 405 to perform pre-pressing calibration and testing. The servo turntable 407 as a core transfer mechanism is driven by the third sliding table 406 to move along the linear track, and can sequentially transport the fixed jig 1 carrying the sensor to be tested to the first test module 403 (pre-pressing calibration station) and the second test module 405 (standard pressure cycle test station), realizes seamless connection of key links such as feeding, pre-pressing and testing, avoids manual intervention or complex mechanical transmission, and improves the continuity and automation level of the overall test process. In addition, combined with the rotary indexing function of the servo turntable 407, multiple jig units distributed in a circle can be accurately reached in turn at the test station of the first test module 403 or the second test module 405, realizing single sensor testing or synchronous and orderly testing of batch sensors, and maximizing the test efficiency.

[0051] Working principle: Example two is further expanded on the basis of example one to a complete automatic feeding test fixture. In example two, through the cooperation of the four modules of the fixed jig 1, the feeding mechanism 2, the grabbing manipulator 3 and the test mechanism 4, a full-automatic pressure sensor measurement test fixture integrating feeding, fixing, transfer and testing is formed. Through the modular mechanism cooperative operation and the process test station design, the full-process automation of the pressure sensor from batch feeding to multi-step sequence accurate testing is realized. Specifically, the fixed jig 1 adopts the tray 101 and the independent jig unit structure, and the telescopic push rod 102 drives the lateral fixing arm 104 and the bottom support plate 106 to accurately clamp the sensor, realizing multi-model adaptive fixing; the feeding mechanism 2 uses the guide column 202 and the jig bearing disc 204 distributed in a ring shape, and through the jacking conveying, the uppermost jig is automatically aligned to the feeding position, supporting batch storage and single continuous supply; the grabbing manipulator 3 realizes accurate grabbing and transfer of the fixed jig 1 through the cooperative action of the horizontal sliding table, the lifting cylinder 303 and the mechanical arm; the test mechanism 4 is configured with the first test module 403 driven by the first sliding table 402 to perform pre-pressing calibration, the second test module 405 driven by the second sliding table 404 to perform standard pressure cycle and data acquisition, and the servo turntable 407 driven by the third sliding table 406 to realize accurate circulation of the jig unit between test stations, so as to complete the full-automatic process from feeding, fixing, transfer to multi-step pressure test, and significantly improve the test efficiency.

[0052] In combination with the above example one and example two, the present application also provides a measurement test method of a pressure sensor measurement test fixture, comprising the following steps:

[0053] Step 1: The fixed jig 1 is prepared and loaded with sensors: the sensors to be tested are loaded into each jig unit of the fixed jig 1 one by one, the telescopic push rod 102 drives the linkage plate, the lateral fixing arm 104 is driven to retract inward along the guide limiting groove to clamp the outer side end of the sensor, and the bottom support plate 106 supports the bottom of the sensor, so as to realize stable fixing of the sensor; the stroke of the telescopic push rod 102 is controlled by program, the retracting range of the lateral fixing arm 104 is adjusted, different shapes and sizes of sensors are adapted, and batch loading of multi-model sensors is completed.

[0054] Step 2: Batch feeding and layer-by-layer feeding: the fixed jigs 1 loaded with sensors are stacked on the jig bearing disc 204 of the feeding mechanism 2, the jig bearing disc 204 is driven by the feeding sliding table 203 to vertically ascend and descend along the guide column 202, the uppermost fixed jig 1 is aligned to the feeding position layer by layer, an automatic feeding mode of batch storage and single supply is realized, and it is ensured that the grabbing manipulator 3 can stably obtain the uppermost jig to be tested.

[0055] Step 3: Automatic grabbing and transferring: the grabbing slide table 301 drives the base 302 on its front side to move laterally above the jig carrier disc 204, the lifting electric cylinder 303 on the front end of the base 302 controls the vertical downward movement of the grabbing mechanical arm 304, grabs the uppermost fixed jig 1, and then lifts and laterally translates above the servo turntable 407 of the testing mechanism 4, and then places the fixed jig 1 on the negative pressure suction disc surface of the servo turntable 407 through the lifting electric cylinder 303, and completes the automatic transfer from the feeding mechanism 2 to the testing station.

[0056] Step 4: Pre-pressing calibration and zero-point adjustment: the servo turntable 407 is driven by the third slide table 406 to move below the first test module 403, the first test module 403 performs rapid pre-pressing on the sensor on the fixed jig 1, applies a pre-set small range of pressure (usually 5%-10% of the sensor range), and records the initial output signal, completes the initial zero-point calibration, eliminates the measurement deviation caused by transportation, installation or environmental changes, and establishes a reference for subsequent high-precision testing.

[0057] Step 5: Multi-dimensional pressure testing and data acquisition: after pre-pressing calibration, the servo turntable 407 is driven by the third slide table 406 to move below the second test module 405, the second test module 405 performs standard pressure cycle testing on the sensor, applies multiple pressure values covering the full range, and simultaneously collects sensor output signals in real time, obtains key performance indicators such as linearity, hysteresis, repeatability, sensitivity, and zero-point drift, and completes comprehensive performance evaluation.

[0058] Step 6: Multi-jig cycle testing: through the rotation indexing function of the servo turntable 407, multiple jig units distributed in a circle are accurately reached in turn to the testing stations of the first test module 403 and the second test module 405, realizing one-by-one testing of a single sensor or synchronous and orderly testing of batch sensors, maximizing testing efficiency; after testing is completed, the servo turntable 407 can continue to transfer to the discharging station or perform the next round of testing cycle.

[0059] The above only describes certain exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above figures and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A pressure sensor metrology test fixture, the metrology test fixture is configured for an automatic test fixture system for implementing automatic feeding, clamping and multi-dimensional pressure testing of pressure sensors, the automatic test fixture system comprises a fixed jig (1), a feeding mechanism (2), a grabbing manipulator (3) and a testing mechanism (4), characterized in that: the fixed jig (1) is used for fixing the pressure sensors to be tested, and the fixed jig (1) comprises a tray (101) and a plurality of jig units distributed at intervals along the end face of the tray (101), each jig unit is used for independently fixing one pressure sensor to be tested; the feeding mechanism (2) is used for realizing the lifting and conveying of the fixed jig (1), and the feeding mechanism (2) comprises a feeding table (201), a guide column (202), a feeding sliding table (203) and a jig bearing disc (204), the guide column (202) and the feeding sliding table (203) are arranged on the end face of the feeding table (201), the guide column (202) is provided with a plurality of guide columns which are arranged in a ring shape, the feeding sliding table (203) is arranged on one side of the plurality of guide columns (202), and the sliding end of the feeding sliding table (203) is connected with the jig bearing disc (204); the jig bearing disc (204) is provided with a guide hole which is slidably connected with the guide column (202), and a plurality of fixed jigs (1) are stacked on the jig bearing disc (204); the grabbing manipulator (3) is used for grabbing the fixed jig (1) from the jig bearing disc (204), and the grabbing manipulator (3) comprises a grabbing sliding table (301), a base (302), a lifting electric cylinder (303) and a grabbing manipulator arm (304); the testing mechanism (4) is used for performing automatic multi-step sequence pressure calibration testing on the fixed pressure sensors to be tested, and the testing mechanism (4) comprises a testing table (401), a first sliding table (402), a first testing module (403), a second sliding table (404), a second testing module (405), a third sliding table (406) and a servo turntable (407), the testing table (401) is arranged side by side with the feeding table (201), the first sliding table (402) and the second sliding table (404) are arranged on the rear side of the end face of the testing table (401), and the third sliding table (406) is arranged on the front side of the end face of the testing table (401).

2. A pressure sensor metrology test fixture according to claim 1, wherein: The jig unit comprises a telescopic push rod (102), a mounting seat (103), a lateral fixing arm (104), a linkage plate (105) and a bottom supporting plate (106), the telescopic push rod (102) is fixed on the tray (101), the mounting seat (103) is arranged on the outside of the telescopic push rod (102), and the shaft end of the telescopic push rod (102) is connected with the linkage plate (105).

3. A pressure sensor metrology test fixture according to claim 2, wherein: The lateral fixing arm (104) is provided with a plurality of groups which are hinged to the outside of the mounting seat (103) through elastic hinge shafts, the linkage plate (105) is provided with a guide limiting groove corresponding in number and position to the lateral fixing arm (104), and the lateral fixing arm (104) is inwardly folded and clamps and fixes the outside end of the pressure sensor to be tested when the linkage plate (105) moves with the telescopic push rod (102).

4. A pressure sensor metrology test fixture according to claim 2, wherein: The linkage plate (105) is centrally mounted with a bottom supporting plate (106) at the top, which is used to support the bottom of the pressure sensor.

5. A pressure sensor metrology test fixture according to claim 1, wherein: The tray (101) of the fixing jig (1) is provided with a guide groove matched with a guide column (202), the jig bearing disc (204) moves up and down with the feeding slide (203) and aligns with the material taking position layer by layer, so that the uppermost fixing jig (1) is at a fixed height reachable by the material grabbing manipulator (3).

6. A pressure sensor metrology test fixture according to claim 1, wherein: The grabbing slide (301) is horizontally arranged and is connected with the feeding table (201) through the frame at the bottom end, the base (302) is arranged on the sliding end of the front side of the grabbing slide (301), the lifting electric cylinder (303) is mounted on the front end of the base (302), and the shaft end of the lifting electric cylinder (303) is connected with the grabbing mechanical arm (304).

7. A pressure sensor metrology test fixture according to claim 1, wherein: The first test module (403) and the second test module (405) are respectively connected with the sliding end of the first slide (402) and the second slide (404), the first test module (403) is used for executing rapid pre-pressing and initial zero-point calibration, and the second test module (405) is used for executing standard pressure cycle and data acquisition.

8. A pressure sensor metrology test fixture according to claim 1, wherein: The servo turntable (407) is arranged on the sliding end of the third slide (406), the servo turntable (407) is provided with a negative pressure suction disc surface used for bearing and positioning the fixing jig (1), and the servo turntable (407) is used for transferring the fixing jig (1) to the test station and cooperating with the first test module (403) and the second test module (405) to perform pre-pressing calibration and testing.

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