A pressure sensor fatigue testing machine and control method

Abstract

The application discloses a kind of pressure sensor fatigue testing machine and control method, it is related to pressure sensor test technical field, including rack and test station, test station includes the fixture assembly of installation measured pressure sensor, the pressure applying component of periodic pressure load to pressure sensor is applied and the control component of acquisition pressure parameter and execution closed loop control;Pressure applying component includes servo drive unit, screw drive unit, guiding support unit, pull rod component, counterweight assembly, plunger mechanism and local oil tank;Counterweight assembly is periodically lifted and released under the control of servo drive unit, through plunger mechanism and local oil tank, by pressure conducting piece it is applied to the pressure test surface of pressure sensor;Control component is closed loop regulated based on pressure detection signal to loading process, the settable and repeatable of pressure load are realized;So that testing machine has the advantages of simple structure, pressure control accurate, high loading frequency, and improve the fatigue test efficiency and reliability of pressure sensor.

Description

Technical Field

[0001] This invention relates to the field of pressure sensor testing technology, and in particular to a pressure sensor fatigue testing machine and control method. Background Technology

[0002] Pressure sensors, as key measurement components in industrial automation, automotive electronics, energy equipment, and aerospace, must withstand frequent and repeated pressure loading and unloading during their long-term service. To verify the stability, reliability, and lifespan performance of pressure sensors under long-term cyclic pressure, high-cycle pressure shock or pressure cyclic testing is typically performed using a fatigue testing machine. In practical applications, the number of fatigue tests on pressure sensors often needs to reach 10. 5 ~10 7 This requires more than one pressurization cycle, thus placing high demands on the testing equipment in terms of pressurization frequency, pressure control accuracy, operational reliability, and energy consumption.

[0003] Existing pressure sensor fatigue testing technologies typically employ hydraulic systems as the pressure source. A hydraulic pump outputs pressure, and control components such as safety valves, pressure relief valves, and solenoid directional valves are used to control the pressure magnitude and the loading-unloading process. This approach can adjust the pressure amplitude to a certain extent and achieve periodic loading through valve control. However, due to the inherent high fluid inertia and slow response speed of hydraulic systems, their pressurization and depressurization frequencies are significantly limited, making high-frequency fatigue testing difficult. Furthermore, hydraulic systems have high energy consumption, complex structures, and insufficient stability during long-term continuous operation, resulting in excessively long test cycles in high-cycle testing scenarios, often requiring months or even longer to complete a single fatigue test.

[0004] Another existing technical solution combines a motor, reducer, and wheel lifting mechanism. It drives a pull rod to perform reciprocating linear motion and utilizes the weight of the hammer and the spring force to achieve periodic impact loading. This type of solution uses a motor as the power source, and the remaining components are mostly purely mechanical structures. The overall structure is relatively simple, the manufacturing cost is low, and it can increase the impact frequency to some extent. However, this type of device mainly generates mechanical impact force rather than precisely controllable pressure loading. Its loading process is greatly affected by gravity, spring parameters, and the mechanical transmission state, making it difficult to achieve precise adjustment and stable control of the actual pressure value of the sensor. Furthermore, this type of device has a large number of mechanical transmission components, resulting in high frictional losses, low long-term operational reliability, and a complex debugging process. It also typically only allows for a single test station, limiting testing efficiency, and suffers from high consumable consumption and frequent maintenance.

[0005] In summary, the existing technology has at least the following technical problems: In existing pressure sensor fatigue testing, hydraulic equipment suffers from slow system response speed and low pressurization and depressurization frequency, making it difficult to meet the requirements of high-cycle fatigue testing. Mechanical impact equipment suffers from difficulty in accurately controlling the pressure magnitude, insufficient loading consistency and repeatability, as well as technical problems such as complex equipment structure, severe structural wear, and limited testing stations, resulting in low overall testing efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a pressure sensor fatigue testing machine and control method to solve the technical problems in existing pressure sensor fatigue testing, such as the slow system response speed and low pressurization and depressurization frequency of hydraulic equipment, which makes it difficult to meet the requirements of high-frequency fatigue testing; the difficulty in accurately controlling the pressure magnitude of mechanical impact equipment, insufficient loading consistency and repeatability; and the low overall testing efficiency due to complex equipment structure, severe structural wear, and limited testing stations.

[0007] The preferred technical solutions among the many technical solutions provided by this invention can produce a variety of technical effects, which are described in detail below.

[0008] To address the aforementioned technical problems, the present invention provides the following technical solution: This invention provides a pressure sensor fatigue testing machine, including a frame and at least one testing station. The testing station includes a clamp assembly for mounting the pressure sensor under test, a pressure-applying assembly for applying a cyclic pressure load to the pressure sensor, and a control assembly for acquiring pressure parameters and performing closed-loop control. The pressure-applying assembly includes: a servo drive unit, a screw drive unit for converting the rotational motion of the servo drive unit into linear motion, a guide support unit, a pull rod component that reciprocates linearly in conjunction with the screw drive unit, a counterweight assembly with replaceable counterweights, a plunger mechanism that cooperates with the counterweight assembly to transmit force, and a local oil tank. The local oil tank has a pressure input end and a pressure output end. The plunger mechanism has a pressure-bearing end and a pressure-relieving end, the pressure-bearing end receiving the downward pressure applied by the counterweight assembly. The pressure relief end extends into the local oil tank and cooperates with the pressure input end to apply pressure to the working medium in the local oil tank; the pressure output end abuts against the pressure test surface of the pressure sensor through a pressure transmission component to transmit the pressure in the local oil tank to the pressure sensor; the servo drive unit drives the pull rod component to lift and release the counterweight assembly according to a preset displacement and frequency, so that the counterweight assembly applies periodic pressure to the pressure input end through the plunger mechanism under the action of gravity, thereby realizing pressure fatigue loading on the pressure sensor through the pressure output end; the control component is configured to adjust the displacement, frequency and / or loading holding time of the servo drive unit based on the pressure detection signal to realize the settable and repeatable pressure load.

[0009] In one embodiment, the test station includes a first station and a second station, each station corresponding to an independent pressure load parameter setting and control channel, and the two stations share the same local oil tank, thereby realizing multi-station parallel fatigue testing without increasing the floor space.

[0010] In one embodiment, the lead screw transmission unit is a ball screw, the guide support unit is a linear guide, and the servo drive unit, the ball screw, and the linear guide constitute a linear motion platform to improve the consistency of the displacement applied to the counterweight assembly and the reliability of its operation.

[0011] In one embodiment, the counterweight assembly includes a counterweight base plate and at least one detachable counterweight block. The weight of the counterweight base plate corresponds to the basic range of the pressure sensor fatigue testing machine. The detachable counterweight block can be stacked or replaced to achieve rapid configuration of different pressure ranges.

[0012] In one embodiment, a buffer damping component is provided between the counterweight base plate and the tie rod component. The buffer damping component is a rubber pad or an elastomer pad, which is used to reduce the impact between the counterweight component and the tie rod component, and between the counterweight base plate and the counterweight block during the lifting and releasing process, and to reduce wear. The buffer damping component is a replaceable component.

[0013] In one embodiment, the pressure relief end of the plunger mechanism is immersed in the working medium in the local oil tank, enabling the plunger mechanism to automatically replenish fluid, dynamically seal and / or lubricate during operation, thereby reducing the risk of leakage and improving durability and reliability.

[0014] In one embodiment, the pressure detection signal of the pressure fatigue loading is obtained by a pressure measuring device disposed in the local oil tank and located between the pressure input end and the pressure output end, and the control component calibrates, records and / or protects against over-limit based on the detection value of the pressure measuring device.

[0015] In one embodiment, the clamping assembly has multiple clamping positions or multi-channel mounting positions for simultaneously clamping multiple pressure sensors at the same workstation; the pressure output end of the local oil tank abuts against the pressure test surface of each pressure sensor through multiple pressure transmission components, so as to realize the parallel testing of multiple components at the same workstation and increase the number of tests per unit time.

[0016] In one embodiment, a local heating and insulation component is further included, which includes a heating element for local heating of the clamp assembly and / or the pressure sensor, and an insulation cover covering the clamp assembly and the pressure sensor; the control component is electrically connected to the heating element and sets and adjusts the heating temperature in a closed loop to perform temperature fatigue testing on the pressure sensor within the local cavity formed by the insulation cover and reduce energy consumption.

[0017] A pressure sensor fatigue test control method is also provided, which is applied to a pressure sensor fatigue testing machine, including the following steps: S1, parameter setting: setting target pressure load parameters, wherein the target pressure load parameters include target pressure or pressure window, loading frequency, loading displacement and / or number of cycles; S2, Lifting Preparation: Control the servo drive unit to drive the lead screw transmission unit to move the pull rod component upward, so that the counterweight component is at the preset height; S3, Release Loading: Control the servo drive unit to perform a release action, so that the counterweight component generates a pressure load on the pressure input end of the local oil tank under the action of gravity through the plunger mechanism, and the pressure output end of the local oil tank applies pressure to the pressure test surface of the pressure sensor through the pressure transmission component. S4. Pressure Detection and Calibration: Collect the actual pressure value of the pressure measuring instrument and compare the actual pressure value with the target pressure or pressure window; when the deviation exceeds the preset pressure threshold, adjust the loading displacement, release timing and / or frequency parameters; S5. Repeated execution: Repeat S2 to S4 until the preset number of cycles is reached, and output fatigue test result data and / or abnormal alarm information.

[0018] The beneficial effects of this invention are as follows: (1) Significantly increase the frequency of pressure loading and unloading, and shorten the fatigue test cycle. A linear drive mechanism consisting of a servo drive unit, a lead screw transmission unit, and a tie rod component is used to perform high-frequency, controllable lifting and releasing of the counterweight assembly. This allows the counterweight assembly to act on the plunger mechanism in a periodic motion under gravity, thereby creating pressure loading through a localized oil groove. Compared to traditional hydraulic fatigue testing equipment that relies on hydraulic pumps and valve switching, this technical solution avoids the inherent fluid inertia and valve control response hysteresis problems of hydraulic systems. It can significantly improve the pressurization and depressurization frequency while ensuring pressure stability, effectively meeting the requirements of pressure sensor 10. 5 ~10 7 This significantly reduces the need for multiple fatigue tests, thus shortening the testing cycle.

[0019] (2) Achieve precise control and high repeatability of pressure load, and improve test consistency. This technical solution does not apply force to the test piece through simple mechanical impact. Instead, it uses a pressure transmission chain of "counterweight assembly—plunger mechanism—local oil groove—pressure transmission component" to convert the force generated by the counterweight into a pressure load acting on the test surface of the pressure sensor. By setting an interface pressure detection signal, the control component performs closed-loop adjustment of the displacement, frequency, and load holding time of the servo drive unit. This allows the actual loading pressure of each cycle to be monitored and corrected in real time, avoiding the problems of uncontrollable pressure and poor repeatability caused by friction, elastic decay, and other factors in traditional mechanical impact equipment, significantly improving the consistency and reliability of fatigue test results.

[0020] (3) Simplified structure, reduced wear, and improved long-term operational reliability By concentrating the pressure loading function into the servo linear drive mechanism and the counterweight-plunger structure, the complex hydraulic circuit, numerous valves, and high-pressure sealing structure are avoided. At the same time, the pressure relief end of the plunger mechanism is immersed in a local oil tank, enabling automatic fluid replenishment, dynamic sealing, and lubrication during operation, reducing the risk of wear and leakage at the plunger and sealing parts. Compared with the existing mechanical impact solutions that suffer from multi-stage mechanical transmission and severe impact wear, this technical solution has a simpler overall structure, significantly improved long-term operational stability and durability, and a marked reduction in maintenance frequency and costs.

[0021] (4) The pressure range configuration is flexible and can meet the testing needs of pressure sensors of different specifications. By setting up a counterweight assembly with replaceable counterweights, different pressure ranges can be quickly switched by simply stacking or replacing counterweights without changing the main structure. This avoids the complex process of repeatedly adjusting spring parameters or hydraulic system pressure settings required in existing technologies, and significantly improves the versatility and ease of use of the equipment.

[0022] (5) Scalable multi-station testing improves overall testing efficiency. The structure of this technical solution facilitates the setting of multiple test stations, and multi-station parallel testing can be achieved without significantly increasing the equipment volume by sharing a local oil tank. This breaks through the limitations of traditional fatigue testing equipment, which is characterized by single station and low efficiency, and significantly increases the number of tests per unit time. It is suitable for the reliability verification of batch pressure sensors.

[0023] In summary, this technical solution combines servo linear drive, gravity loading, and local hydraulic pressure conversion to achieve high-frequency, low-energy-consumption, and structurally simplified pressure sensor fatigue testing while ensuring pressure controllability and repeatability. It can effectively overcome the comprehensive technical defects of existing hydraulic and mechanical impact fatigue testing equipment. Attached Figure Description

[0024] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a single test station of the pressure sensor fatigue testing machine of the present invention; Figure 2 This is a schematic diagram of the structure of the clamp assembly of the present invention; Figure 3 This is a side view of the fatigue testing machine for pressure sensors according to the present invention. Figure 4 This is a front view structural schematic diagram of the pressure sensor fatigue testing machine of the present invention; Figure 5 This is a schematic diagram of the flow steps of the pressure sensor fatigue test control method of the present invention.

[0026] The accompanying figure is labeled as follows: 1. Rack; 2. Test station; 21. First station; 22. Second station; 3. Fixture assembly; 4. Pressure sensor; 5. Pressure application assembly; 51. Servo drive unit; 52. Screw drive unit; 53. Guide support unit; 54. Tie rod assembly; 55. Counterweight assembly; 551. Counterweight base plate; 552. Counterweight block; 56. Piston mechanism; 561. Pressure bearing end; 562. Pressure releasing end; 57. Local oil groove; 58. Pressure transmission component; 6. Control components; 7. Buffer and vibration damping components; 8. Localized heating and insulation components; 81. Heating element; 82. Insulation cover; 9. Pressure sensor fatigue testing machine. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0028] A pressure sensor fatigue testing machine and control method are provided in the specific embodiment. The machine includes a frame and a testing station. The testing station includes a clamp assembly for mounting the pressure sensor under test, a pressure application assembly for applying periodic pressure loads to the pressure sensor, and a control assembly for acquiring pressure parameters and performing closed-loop control. The pressure application assembly includes a servo drive unit, a lead screw drive unit, a guide support unit, a tie rod component, a counterweight assembly, a plunger mechanism, and a local oil tank. The counterweight assembly is periodically lifted and released under the control of the servo drive unit, and acts on the pressure test surface of the pressure sensor through the plunger mechanism and the local oil tank via a pressure transmission component. The control assembly is based on the pressure... The detection signal enables closed-loop regulation of the loading process, achieving settable and repeatable pressure loads. This results in a testing machine with advantages such as simple structure, precise pressure control, and high loading frequency, while also improving the efficiency and reliability of pressure sensor fatigue testing. It effectively addresses the technical problems of existing pressure sensor fatigue testing methods, including: slow system response and low pressurization and depressurization frequencies in hydraulic equipment, making it difficult to meet the requirements of high-cycle fatigue testing; difficulty in precisely controlling pressure magnitude, insufficient loading consistency and repeatability in mechanical impact equipment; and complex equipment structures, severe structural wear, and limited testing stations, leading to low overall testing efficiency.

[0029] The first implementation of the pressure sensor fatigue testing machine, for example Figures 1 to 4As shown, the system includes a frame 1 and at least one test station 2. The test station 2 includes a fixture assembly 3 for mounting the pressure sensor 4 to be tested, a pressure application assembly 5 for applying a periodic pressure load to the pressure sensor 4, and a control assembly 6 for acquiring pressure parameters and performing closed-loop control. The pressure application assembly 5 includes: a servo drive unit 51, a screw drive unit 52 for converting the rotational motion of the servo drive unit 51 into linear motion, a guide support unit 53, a pull rod component 54 that reciprocates linearly in conjunction with the screw drive unit 52, a counterweight assembly 55 with replaceable counterweights, a plunger mechanism 56 that cooperates with the counterweight assembly 55 to transmit force, and a local oil tank 57. The local oil tank 57 is provided with a pressure input end and a pressure output end. The plunger mechanism 56 has a pressure-bearing end 561 and a pressure-relieving end 562. The pressure-bearing end 561 receives the counterweight. The pressure applied by component 55 is released by the pressure relief end 562, which extends into the local oil tank 57 and cooperates with the pressure input end to apply pressure to the working medium in the local oil tank 57. The pressure output end abuts against the pressure test surface of the pressure sensor 4 through the pressure transmission element 58 to transmit the pressure in the local oil tank 57 to the pressure sensor 4. The servo drive unit 51 drives the pull rod component 54 to lift and release the counterweight component 55 according to the preset displacement and frequency, so that the counterweight component 55 applies periodic pressure to the pressure input end through the plunger mechanism 56 under the action of gravity, thereby realizing pressure fatigue loading on the pressure sensor 4 through the pressure output end. The control component 6 is configured to adjust the displacement, frequency and / or loading holding time of the servo drive unit 51 based on the pressure detection signal to realize the settable and repeatable pressure load.

[0030] Compared with existing technologies, this technical solution addresses the technical problems in existing pressure sensor 4 fatigue testing. Hydraulic equipment suffers from slow system response and low pressurization and depressurization frequency, making it difficult to meet the requirements of high-cycle fatigue testing. Mechanical impact equipment suffers from difficulty in precisely controlling pressure magnitude, insufficient loading consistency and repeatability, and complex equipment structure, severe structural wear, and limited testing stations, resulting in low overall testing efficiency. This solution offers several advantages: significantly increasing the pressure loading and unloading frequency and shortening the fatigue testing cycle; using a linear drive mechanism composed of a servo drive unit 51, a screw drive unit 52, and a tie rod component 54 to perform high-frequency, controllable lifting and releasing of the counterweight component 55, causing the counterweight component 55 to act on the plunger mechanism 56 in a periodic motion under gravity, thereby forming pressure loading through the local oil groove 57; compared with traditional hydraulic fatigue testing equipment that relies on hydraulic pumps and valve switching, this technical solution avoids the inherent fluid inertia and valve control response lag problems of hydraulic systems, significantly increasing the pressurization and depressurization frequency while ensuring pressure stability, effectively meeting the requirements of pressure sensor 4 10. 5 ~10 7 This significantly reduces the need for multiple fatigue tests, thus shortening the testing cycle.

[0031] This technical solution achieves precise control and high repeatability of pressure load, improving test consistency. Instead of applying force to the test piece through simple mechanical impact, it uses a pressure transmission chain—"counterweight component 55—plunger mechanism 56—local oil groove 57—pressure transmission component 58"—to convert the force generated by the counterweight into a pressure load acting on the test surface of the pressure sensor 4. Furthermore, by setting an interface pressure detection signal, the control component 6 performs closed-loop adjustment of the displacement, frequency, and load holding time of the servo drive unit 51. This allows the actual loading pressure of each cycle to be monitored and corrected in real time, avoiding the problems of uncontrollable pressure and poor repeatability caused by friction and elastic decay in traditional mechanical impact equipment, significantly improving the consistency and reliability of fatigue test results.

[0032] The simplified structure and reduced wear enhance long-term operational reliability. The pressure loading function is concentrated in the servo linear drive mechanism and the counterweight-plunger structure, avoiding complex hydraulic circuits, numerous valves, and high-pressure sealing structures. Simultaneously, the pressure relief end 562 of the plunger mechanism 56 is immersed in a local oil groove 57, enabling automatic fluid replenishment, dynamic sealing, and lubrication during operation, reducing the risk of wear and leakage at the plunger and sealing parts. Compared to the existing mechanical impact solutions with their multi-stage mechanical transmission and severe impact wear, this technical solution features a simpler overall structure, significantly improved long-term operational stability and durability, and a marked reduction in maintenance frequency and costs.

[0033] The pressure range configuration is flexible and adaptable to the testing needs of pressure sensors of different specifications. By setting a counterweight component 55 with replaceable counterweights, different pressure ranges can be quickly switched by simply stacking or replacing the counterweight block 552 without changing the main structure. This avoids the complicated process of repeatedly adjusting spring parameters or hydraulic system pressure settings in the prior art, and significantly improves the versatility and ease of use of the equipment.

[0034] Expandable multi-station testing improves overall testing efficiency. The structure of this technical solution facilitates the setting of multiple test stations 2, and multi-station parallel testing can be achieved without significantly increasing the equipment volume by sharing a local oil tank 57. This breaks through the limitations of traditional fatigue testing equipment with single station and low efficiency, significantly increasing the number of tests per unit time, and is suitable for reliability verification of batch pressure sensors 4.

[0035] In summary, this technical solution combines servo linear drive, gravity loading, and local hydraulic pressure conversion to achieve high-frequency, low-energy-consumption, and structurally simplified pressure sensor fatigue testing while ensuring pressure controllability and repeatability. This effectively overcomes the comprehensive technical defects of existing hydraulic and mechanical impact fatigue testing equipment.

[0036] As one alternative implementation method: Regarding the setup of the aforementioned test station 2, as follows: Figure 1 and Figure 3 As shown, the test station 2 includes a first station 21 and a second station 22. The two stations correspond to independent pressure load parameter setting and control channels, and the two stations share the same local oil tank 57, thereby realizing multi-station parallel fatigue testing without increasing the floor space.

[0037] In application, the first station 21 and the second station 22 are used to install different pressure sensors 4 under test, and each corresponds to an independent pressure load parameter setting and control channel, enabling the two stations to operate synchronously or asynchronously under the same or different loading pressure, loading frequency, and number of cycles. At the same time, the two stations share the same local oil tank 57, so that the pressure medium applied to the local oil tank 57 by the plunger mechanism 56 can be uniformly transmitted and stably output. By setting up multiple stations, parallel fatigue testing at multiple stations can be achieved without increasing the number of oil tanks or the overall floor space. This avoids the problem of pressure consistency not being guaranteed in traditional multi-oil circuit systems and significantly improves the testing efficiency per unit time, thereby solving the technical problems of limited number of stations and low overall efficiency in existing pressure sensor 4 fatigue testing equipment.

[0038] In addition, the number of test stations 2 is not limited to two, and can be expanded to three or more stations according to testing needs.

[0039] Regarding the specific structure of the aforementioned transmission unit, as follows: Figure 1 As shown, the lead screw transmission unit 52 is a ball screw, the guide support unit 53 is a linear guide, and the servo drive unit 51, the ball screw and the linear guide constitute a linear motion platform to improve the consistency of the loading displacement of the counterweight component 55 and the operational reliability.

[0040] In application, the servo drive unit 51 outputs precise and controllable rotary motion under the command of the control component 6. This motion is converted into high-precision linear displacement by the ball screw, and the linear guide provides stable guidance and support to the tie rod component 54, thus forming a linear motion platform with high rigidity and high repeatability. The linear motion platform works in conjunction with the counterweight component 55 and the plunger mechanism 56 to ensure that each lifting height and release stroke remains highly consistent, avoiding fluctuations in loading force caused by mechanical runout or transmission backlash. This significantly improves the consistency and repeatability of pressure loading, solving the problem of uncontrollable pressure caused by transmission instability in traditional mechanical impact fatigue tests.

[0041] Regarding the specific structure of the aforementioned counterweight component 55, as follows: Figure 1As shown, the counterweight assembly 55 includes a counterweight base plate 551 and at least one detachable counterweight block 552. The weight of the counterweight base plate 551 corresponds to the basic range of the pressure sensor fatigue testing machine 9. The detachable counterweight block 552 can be stacked or replaced to achieve rapid configuration of different pressure ranges.

[0042] In application, the counterweight base plate 551 serves as the basic load unit, and its self-weight corresponds to the basic pressure range of the pressure sensor fatigue testing machine 9. By superimposing or replacing detachable counterweight blocks 552 on the counterweight base plate 551, the total mass of the counterweight assembly 55 changes, thereby achieving rapid switching between different pressure ranges without changing the drive parameters and plunger structure. Through the coordinated operation of the adjustable weight counterweight structure and the displacement control of the servo drive unit 51, the equipment can be compatible with the fatigue testing requirements of multiple specifications of pressure sensors 4, avoiding the problems of complex debugging and poor repeatability caused by frequent adjustment of the hydraulic system or replacement of elastic elements in the prior art.

[0043] Regarding the wear reduction structure between the aforementioned counterweight base plate 551 and tie rod member 54, such as Figure 1 As shown, a buffer damping component 7 is provided between the counterweight base plate 551 and the tie rod component 54. The buffer damping component 7 is a rubber pad or an elastomer pad, which is used to reduce the impact between the counterweight component 55 and the tie rod component 54, and between the counterweight base plate 551 and the counterweight block 552 during the lifting and releasing process and to reduce wear. The buffer damping component 7 is a replaceable part.

[0044] When applied, a buffer damping component 7 is installed between the counterweight base plate 551 and the tie rod component 54 to effectively absorb and attenuate the instantaneous impact load generated by the counterweight component 55 during lifting and releasing, thereby reducing the direct hard contact impact between the tie rod component 54, the counterweight base plate 551 and the counterweight block 552. When matched with high-frequency cyclic loading conditions, it can significantly reduce the fatigue wear and noise generation of metal parts, improve the stability and service life of the equipment under long-term high-frequency operation, and solve the problems of severe wear and low reliability of traditional mechanical impact equipment.

[0045] The specific structure of the rubber pad or elastomer pad is a multi-layered composite elastic structure to enhance vibration reduction performance.

[0046] Regarding the lubrication and long-term operation settings of the aforementioned plunger mechanism 56, such as... Figure 1 and Figure 3 As shown, the pressure relief end 562 of the plunger mechanism 56 is immersed in the working medium in the local oil tank 57, so that the plunger mechanism 56 can automatically replenish fluid, dynamically seal and / or lubricate during operation, thereby reducing the risk of leakage and improving durability and reliability.

[0047] During application, the pressure relief end 562 of the plunger mechanism 56 is continuously immersed in the working medium in the local oil groove 57, so that the plunger is always in a lubricated and sealed state during the reciprocating motion, thereby achieving automatic fluid replenishment, dynamic sealing and reduced friction during the pressurization process; by working in conjunction with the local oil groove 57, the wear and leakage risk of the plunger and the seal are reduced, and the stability of the pressure transmission process is also ensured, significantly improving the durability and reliability of the equipment in high-cycle fatigue tests, and overcoming the problem of short service life of traditional plunger or hydraulic sealing structures.

[0048] The working medium needs to be selected according to the test pressure range, using hydraulic oil or functional fluid of different viscosity grades. The plunger surface is coated with wear-resistant coating or low-friction material to further reduce structural wear.

[0049] Regarding the specific settings for the aforementioned pressure detection signal, as follows: Figure 1 As shown, the pressure detection signal of the pressure fatigue loading is obtained by a pressure measuring device located in the local oil tank 57 and between the pressure input end and the pressure output end. The control component 6 calibrates, records and / or protects against over-limit loading based on the detection value of the pressure measuring device.

[0050] In application, the pressure measuring device is positioned between the pressure input and output ends of the local oil tank 57 to acquire the actual loading pressure in real time and feed the detection signal back to the control component 6. The control component 6 dynamically adjusts the displacement, frequency, and loading holding time of the servo drive unit 51 based on the pressure detection signal from the pressure measuring device, thereby forming a closed-loop pressure control. This allows each pressure loading to be monitored and corrected in real time, avoiding pressure deviations caused by environmental changes or mechanical wear, significantly improving the accuracy and repeatability of fatigue test data, and solving the problem of unmonitorable pressure in existing mechanical impact tests.

[0051] The pressure measuring instrument uses a high-precision pressure sensor 4, a pressure transmitter, or an integrated pressure detection module, and is linked with the control component 6, which is equipped with a data acquisition system, to achieve long-term data recording and analysis.

[0052] Regarding the specific structure and function of the aforementioned clamping assembly 3, as follows: Figures 1 to 3 As shown, the fixture assembly 3 has multiple clamping positions or multi-channel mounting positions for simultaneously clamping multiple pressure sensors 4 at the same workstation; the pressure output end of the local oil tank 57 is connected to the pressure test surface of each pressure sensor 4 through multiple pressure transmission components 58, so as to realize the parallel testing of multiple components at the same workstation and increase the number of tests per unit time.

[0053] When applied, the fixture assembly 3 is provided with multiple clamping positions or multi-channel mounting positions, so that multiple pressure sensors 4 can be clamped simultaneously on the same test station 2; the pressure output end of the local oil tank 57 is connected to the pressure test surface of each pressure sensor 4 through multiple pressure transmission components 58, thereby ensuring that multiple test pieces receive synchronous pressure loading under the same pressure source; the fixture assembly 3, which installs multiple pressure sensors 4 and works in conjunction with the multi-station design, can significantly increase the number of sensor tests per unit time, solving the problem of single-piece testing and low efficiency of traditional fatigue testing equipment.

[0054] The pressure transmission element 58 has an equal length structure or an adjustable structure to compensate for the slight height difference at different installation positions and ensure that each pressure sensor 4 is subjected to consistent pressure.

[0055] A second embodiment of the pressure sensor fatigue testing machine, for example Figure 3 As shown, the difference between this embodiment and the first embodiment is that it also includes a local heating and insulation component 8. The local heating and insulation component 8 includes a heating element 81 for local heating of the clamp assembly 3 and / or pressure sensor 4, and an insulation cover 82 covering the clamp assembly 3 and pressure sensor 4. The control component 6 is electrically connected to the heating element 81 and sets and adjusts the heating temperature in a closed loop to perform temperature fatigue testing on the pressure sensor 4 in the local cavity formed by the insulation cover 82 and reduce energy consumption.

[0056] In application, by setting up a local heating and insulation component 8, the fixture component 3 and pressure sensor 4 are placed in a controlled temperature environment. The control component 6 performs closed-loop adjustment of the heating element 81, so that the pressure fatigue loading and temperature conditions work together. Since the heating range is limited to the local cavity formed by the insulation cover 82, the energy waste caused by heating the whole machine is avoided. While realizing fatigue testing under temperature conditions, energy consumption is significantly reduced, solving the problems of high energy consumption and slow response of existing temperature fatigue testing equipment.

[0057] The heating element 81 adopts an electric heating plate, heating film or hot air circulation structure, while the heat insulation cover 82 adopts a multi-layer heat insulation structure to adapt to the test requirements of different temperature ranges.

[0058] Based on the above embodiments of the pressure sensor fatigue testing machine, a pressure sensor fatigue testing control method is provided, which is applied to the above-mentioned pressure sensor fatigue testing machine, such as... Figure 5 As shown, the following steps are implemented sequentially from S1 to S5: S1, parameter setting: setting the target pressure load parameters, which include the target pressure or pressure window, loading frequency, loading displacement and / or number of cycles; S2, Lifting Preparation: Control the servo drive unit to drive the lead screw transmission unit to move the pull rod component upward, so that the counterweight component is at the preset height; S3, Release Loading: Control the servo drive unit to perform a release action, so that the counterweight component generates a pressure load on the pressure input end of the local oil tank under the action of gravity through the plunger mechanism, and the pressure output end of the local oil tank applies pressure to the pressure test surface of the pressure sensor through the pressure transmission component. S4. Pressure Detection and Calibration: Collect the actual pressure value of the pressure measuring instrument and compare the actual pressure value with the target pressure or pressure window; when the deviation exceeds the preset pressure threshold, adjust the loading displacement, release timing and / or frequency parameters; S5. Repeated execution: Repeat S2 to S4 until the preset number of cycles is reached, and output fatigue test result data and / or abnormal alarm information.

[0059] In application, by pre-setting the target pressure or pressure window, loading frequency, loading displacement and number of cycles in step S1, the entire fatigue test process has a clear and quantifiable control benchmark. In steps S2 and S3, the servo drive unit is controlled to drive the screw transmission unit according to the set parameters, so that the tie rod component completes the controlled lifting and releasing action, thereby so that the counterweight component generates a stable and repeatable pressure loading on the pressure input end of the local oil tank through the plunger mechanism under the action of gravity, and the pressure is transmitted to the pressure test surface of the pressure sensor through the local oil tank and the pressure transmission component.

[0060] The pressure loading and the synergistic effect of the "servo drive - counterweight - plunger - local oil groove" structure in the device transform mechanical gravity load into controllable pressure load, avoiding the problem of response lag in traditional hydraulic valve-controlled loading, and overcoming the defects of unquantifiable and unrepeatable pressure in pure mechanical impact loading.

[0061] In step S4, the actual pressure value is collected in real time by a pressure measuring device and compared with the target pressure or pressure window. When the pressure deviation is detected to exceed the preset pressure threshold, the control system immediately adjusts the loading displacement, release timing and / or loading frequency so that the subsequent cyclic loading process automatically returns to the target pressure range, thereby forming a complete closed-loop pressure control.

[0062] By repeatedly executing steps S2 to S4 in step S5, a consistent pressure fatigue load can be applied to the pressure sensor under high-frequency cyclic conditions for a long period of time, thereby significantly improving the reliability and consistency of fatigue test results, shortening the overall test cycle, and effectively solving the technical problems of low loading frequency, insufficient pressure control accuracy, and poor repeatability in existing pressure sensor fatigue tests.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. A pressure sensor fatigue testing machine, characterized in that, Including racks; And at least one test station, the test station including a fixture assembly for mounting the pressure sensor to be tested, a pressure application assembly for applying a periodic pressure load to the pressure sensor, and a control assembly for acquiring pressure parameters and performing closed-loop control; The pressure application component includes: a servo drive unit, a screw drive unit that converts the rotational motion of the servo drive unit into linear motion, a guide support unit, a pull rod component that reciprocates linearly in conjunction with the screw drive unit, a counterweight component with replaceable counterweight, a plunger mechanism that cooperates with the counterweight component to transmit force, and a local oil groove. The local oil tank is provided with a pressure input end and a pressure output end; the plunger mechanism has a pressure-bearing end and a pressure-relieving end, the pressure-bearing end receives the downward pressure applied by the counterweight assembly, and the pressure-relieving end extends into the local oil tank and cooperates with the pressure input end to apply pressure to the working medium in the local oil tank; The pressure output end abuts against the pressure test surface of the pressure sensor through a pressure transmission component, so as to transmit the pressure in the local oil tank to the pressure sensor; The servo drive unit drives the pull rod component to lift and release the counterweight component according to a preset displacement and frequency, so that the counterweight component applies periodic pressure to the pressure input end through the plunger mechanism under the action of gravity, thereby realizing pressure fatigue loading on the pressure sensor through the pressure output end; The control component is configured to adjust the displacement, frequency, and / or load holding time of the servo drive unit based on the pressure detection signal, so as to achieve settable and repeatable pressure load.

2. The pressure sensor fatigue testing machine according to claim 1, characterized in that, The test station includes a first station and a second station. Each station corresponds to an independent pressure load parameter setting and control channel, and the two stations share the same local oil tank, thereby realizing multi-station parallel fatigue testing without increasing the floor space.

3. The pressure sensor fatigue testing machine according to any one of claims 1 or 2, characterized in that, The lead screw transmission unit is a ball screw, the guide support unit is a linear guide rail, and the servo drive unit, the ball screw, and the linear guide rail constitute a linear motion platform to improve the consistency of the displacement applied to the counterweight assembly and the reliability of its operation.

4. The pressure sensor fatigue testing machine according to claim 1, characterized in that, The counterweight assembly includes a counterweight base plate and at least one detachable counterweight block. The weight of the counterweight base plate corresponds to the basic range of the pressure sensor fatigue testing machine. The detachable counterweight block can be stacked or replaced to achieve rapid configuration of different pressure ranges.

5. The pressure sensor fatigue testing machine according to claim 1, characterized in that, A buffer and vibration damping component is provided between the counterweight base plate and the tie rod component. The buffer and vibration damping component is a rubber pad or an elastomer pad, which is used to reduce the impact between the counterweight component and the tie rod component, and between the counterweight base plate and the counterweight block during the lifting and releasing process, and to reduce wear. The buffer and vibration damping component is a replaceable part.

6. The pressure sensor fatigue testing machine according to claim 1, characterized in that, The pressure relief end of the plunger mechanism is immersed in the working medium in the local oil tank, enabling the plunger mechanism to automatically replenish fluid, dynamically seal and / or lubricate during operation, thereby reducing the risk of leakage and improving durability and reliability.

7. The pressure sensor fatigue testing machine according to claim 1, characterized in that, The pressure detection signal of the pressure fatigue loading is obtained by a pressure measuring device located in the local oil tank and between the pressure input end and the pressure output end. The control component calibrates, records and / or protects against over-limit loading based on the detection value of the pressure measuring device.

8. The pressure sensor fatigue testing machine according to claim 1, characterized in that, The clamping assembly has multiple clamping positions or multi-channel mounting positions for simultaneously clamping multiple pressure sensors at the same workstation. The pressure output end of the local oil tank is connected to the pressure test surface of each pressure sensor through multiple pressure transmission components, so as to realize the parallel testing of multiple parts at the same station and increase the number of tests per unit time.

9. The pressure sensor fatigue testing machine according to any one of claims 1 or 2, characterized in that, It also includes a local heating and insulation component, which includes a heating element for local heating of the clamp assembly and / or the pressure sensor, and an insulation cover covering the clamp assembly and the pressure sensor; The control component is electrically connected to the heating element and sets and adjusts the heating temperature in a closed loop to perform temperature fatigue testing on the pressure sensor within the local cavity formed by the heat insulation cover and reduce energy consumption.

10. A pressure sensor fatigue test control method, applied to the pressure sensor fatigue testing machine according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Parameter setting: Set the target pressure load parameters, which include target pressure or pressure window, loading frequency, loading displacement and / or number of cycles; S2, Lifting Preparation: Control the servo drive unit to drive the lead screw transmission unit to move the pull rod component upward, so that the counterweight component is at the preset height; S3, Release Loading: Control the servo drive unit to perform a release action, so that the counterweight component generates a pressure load on the pressure input end of the local oil tank under the action of gravity through the plunger mechanism, and the pressure output end of the local oil tank applies pressure to the pressure test surface of the pressure sensor through the pressure transmission component. S4. Pressure Detection and Calibration: Collect the actual pressure value of the pressure measuring instrument and compare the actual pressure value with the target pressure or pressure window; when the deviation exceeds the preset pressure threshold, adjust the loading displacement, release timing and / or frequency parameters; S5. Repeated execution: Repeat S2 to S4 until the preset number of cycles is reached, and output fatigue test result data and / or abnormal alarm information.

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