Flange type pressure transmitter diaphragm fatigue aging test equipment and test method

Abstract

The invention discloses flange type pressure transmitter diaphragm fatigue aging test equipment and a test method. An electromagnetic valve, a 24V direct current power supply and a time relay are arranged in an electrical control cabinet on an equipment main body; a plurality of tool flanges with different diameters are fixed on a table top of the equipment main body; a plurality of panels of the equipment main body are respectively provided with an air pipe joint I, an air pipe joint II and an air path on-off switch; the plurality of gas pipe joints I are respectively connected with the gas outlet connecting pipes I of the tool flanges at the front ends of the corresponding columns, the plurality of gas pipe joints II are respectively connected with the gas outlet connecting pipes I of the tool flanges at the rear ends of the corresponding columns, and the gas outlet connecting pipes II of the tool flanges at the front ends are connected with the gas outlet connecting pipes II of the tool flanges at the rear ends through gas path on-off switches; the air pipe I and the air pipe II of the electromagnetic valve are connected with the air pipe joint I and the air pipe joint II on any panel; and the flange type pressure transmitter is fixed on the tool flange with the corresponding diameter through a gasket according to the diameter of the flange type pressure transmitter. And the efficiency and the precision of the fatigue aging test of the flange type pressure transmitter diaphragm are improved.

Description

Technical Field

[0001] This invention relates to the field of pressure transmitter testing technology, specifically to a fatigue aging testing device and method for a flange-type pressure transmitter diaphragm. Background Technology

[0002] Flanged pressure transmitters are widely used in industrial automation control systems, and the performance stability of their core component, the diaphragm, is crucial. However, residual stress from processes such as stamping and welding during production can affect the accuracy of subsequent measurements. Currently, there is a lack of equipment specifically designed for efficient and accurate testing of diaphragm fatigue aging in flanged pressure transmitters, making it difficult to effectively evaluate and optimize diaphragm performance, thus impacting the reliability and accuracy of the entire pressure transmitter. This invention aims to fill this gap by providing equipment and corresponding testing methods capable of simulating actual operating conditions to perform fatigue aging tests on diaphragms, ensuring high-quality production of flanged pressure transmitters. Summary of the Invention

[0003] The purpose of this invention is to provide a fatigue aging test device and method for flange-type pressure transmitter diaphragms, in order to solve the technical problem that the existing technology lacks a dedicated and efficient device for testing the fatigue aging of flange-type pressure transmitter diaphragms, making it difficult to effectively evaluate and optimize diaphragm performance, which in turn affects the reliability and accuracy of the entire pressure transmitter.

[0004] To achieve the above objectives, this invention provides a flange-type pressure transmitter diaphragm fatigue aging testing device, comprising a flange-type pressure transmitter, a device body, tooling flanges, an electrical control cabinet, a gas circuit on / off switch, a solenoid valve, a time relay, a 24V DC power supply, gas pipe I, gas pipe II, and gaskets; the solenoid valve and the 24V DC power supply are both installed inside the electrical control cabinet, and the time relay is mounted on the control cabinet body; multiple tooling flanges of different diameters are fixed to the tabletop of the device body, and each tooling flange has a gas outlet pipe I and a gas outlet pipe II extending from under the tabletop of the device body for connecting to the gas circuit; multiple panels are spaced apart on the front of the device body, each panel having a gas pipe connector I, a gas pipe connector II, and a gas circuit on / off switch for controlling and connecting the gas circuit; the gas pipe connectors I on the multiple panels are respectively connected to the tooling flanges at the front of their corresponding rows. The air outlet pipe I is connected, and the air pipe connectors II on multiple panels are respectively connected to the air outlet pipe I of the corresponding rear-end tooling flange. The air outlet pipe II of the front-end tooling flange is connected to the air outlet pipe II of the rear-end tooling flange through an air circuit on / off switch. The electrical control cabinet is set on the lower platform of the main body of the equipment. The two air outlet ports of the solenoid valve in the electrical control cabinet are respectively connected to the air pipe connector I and air pipe connector II on any panel through air pipe I and air pipe II. The air inlet port of the solenoid valve is connected to the fixed value air source output by the pressure controller to provide a stable test air pressure. The flange-type pressure transmitter is fixed to the tooling flange of the corresponding diameter by gaskets according to its diameter to ensure the stability and sealing of the pressure transmitter during the test. The circuit connection is as follows: the 24V DC power supply is connected to the time relay and the three-way solenoid valve respectively.

[0005] A test method for a flange-type pressure transmitter diaphragm fatigue aging test device includes the following steps: Step 1: Connect an external air source to the air inlet port of a solenoid valve via a pressure controller. The pressure controller can precisely regulate the pressure of the air source to a fixed value. Based on the maximum range of the flange-type pressure transmitter under test, set the pressure within the range of 3 kPa to 1 MPa to ensure that the test pressure matches the pressure that the pressure transmitter experiences in the actual working environment, providing accurate and reasonable initial pressure conditions for the diaphragm fatigue aging test. Connect the two air outlet ports of the solenoid valve in the electrical control cabinet to air pipe connectors I and II on the front panel of any device body via air pipe I and air pipe II, respectively. Ensure that air pipe connector I on the panel is connected to the air outlet pipe I of the corresponding front-end tooling flange via an air pipe, and air pipe connector II is connected to the air outlet pipe I of the corresponding rear-end tooling flange via an air pipe. The air outlet pipe II of the front-end tooling flange is connected to the air outlet pipe II of the rear-end tooling flange via an air circuit on / off switch. Step 2: Select a tooling flange of the appropriate diameter according to the diameter of the flange-type pressure transmitter, and securely fix it to the tooling flange with gaskets. Adjust the air circuit on / off switch flexibly according to the number of flange-type pressure transmitters to be tested. If two pressure transmitters in the same row need to be tested, connect the two tooling flanges in that row; if only one is to be tested, disconnect the air circuit between the two tooling flanges to ensure that the air circuit connection is correct and to provide a suitable testing environment for different numbers of pressure transmitters. Step 3: Connect the 24V DC power supply to provide stable power support for the time relay and solenoid valve, enabling them to start working normally. The time relay precisely controls the air supply and de-airing time of the solenoid valve according to the preset parameters. Under the control of the time relay, the solenoid valve performs switching operations according to the set rules, thereby realizing the periodic opening and closing of the air circuit, simulating the frequent pressure changes that the diaphragm experiences during actual use. Step four: After starting the equipment, use the counter built into the time relay to accurately accumulate and count the number of solenoid valve switching cycles in real time. The equipment runs continuously for 5000 cycles according to the set program. During this 5000-cycle fatigue process, the dislocation density of the diaphragm metal lattice is further reduced, and the internal stress remaining from the stamping and welding processes is effectively eliminated. After this process, the effective rigidity of the diaphragm will decrease by 8% to 12%, and its elastic hysteresis curve will tend to stabilize. After completing the stress relief cycle, the pressure transmitter is immediately tested for performance. The pressure and time curves are measured, and the zero drift is less than or equal to 0.075%FS and the full-scale hysteresis is less than or equal to 0.075%FS as the pass / fail criteria. If the test results meet the above criteria, it indicates that the internal stress of the diaphragm has been completely released, and the diaphragm performance of the flange-type pressure transmitter has reached the ideal state. This can significantly reduce the subsequent measurement errors caused by residual stress and ensure high-precision measurement and stable operation of the pressure transmitter in practical applications.

[0006] The technical advantages of this invention are: comprehensive compatibility and efficient testing: This invention provides a device specifically designed for testing the fatigue aging of diaphragms in flange-type pressure transmitters. It can effectively simulate actual working conditions and provide a comprehensive and accurate evaluation of diaphragm performance. Compared with existing technologies, this invention, by designing multiple tooling flanges of different diameters and employing flexible air path connections, can adapt to various specifications of flange-type pressure transmitters, significantly improving the device's versatility and practicality. Furthermore, by continuously running 5000 cycles of fatigue aging testing, this invention can simulate the fatigue aging of diaphragms during long-term use in a short time, rapidly evaluating diaphragm performance. The testing efficiency is more than 30% higher than traditional methods, effectively shortening the production cycle.

[0007] Precise Control and High-Quality Assurance: This invention achieves precise control over airflow, pressure output, and test time through solenoid valves, time relays, and a 24V DC power supply within the electrical control cabinet. Compared to existing technologies lacking precise control methods, this invention ensures the stability and repeatability of the testing process, providing reliable conditions for diaphragm fatigue aging testing. In particular, after completing the stress relief cycle, zero-point drift less than or equal to 0.075%FS and full-scale hysteresis less than or equal to 0.075%FS are used as pass / fail criteria to ensure complete stress release within the diaphragm, significantly reducing subsequent measurement errors caused by residual stress. Actual testing shows that flange-type pressure transmitters tested using this invention exhibit a 20% improvement in measurement accuracy and a 25% increase in stability, effectively ensuring high-quality product production.

[0008] Structural optimization and ease of operation: The main body of the device and the tooling flange of this invention have a reasonable structural design. The tooling flange adopts a circular structure with a circular groove and an air outlet pipe, which can ensure the stability and sealing of the air circuit connection. In addition, the multiple panel design on the front of the main body of the device makes the operation of the air circuit on / off switch and air pipe connector more convenient. Users can quickly adjust the air circuit connection as needed, improving the flexibility of testing and operational efficiency. Compared with traditional equipment, the operation time of this invention is reduced by 40%, reducing labor costs and operational difficulty.

[0009] Innovation and Market Competitiveness: This invention not only fills the gap in existing technology regarding the lack of specialized testing equipment for diaphragm fatigue aging of flange-type pressure transmitters, but also significantly improves testing accuracy and efficiency through innovative structural design and testing methods. Particularly in eliminating residual stress on the diaphragm, this invention can reduce the effective rigidity of the diaphragm by 8% to 12% and stabilize its elastic hysteresis curve, a leading technical indicator in the industry. Through the testing method of this invention, the performance of flange-type pressure transmitters is significantly improved, effectively enhancing the product's market competitiveness and providing a more reliable and accurate measurement tool for industrial automation control systems.

[0010] In summary, this invention significantly improves the efficiency and accuracy of diaphragm fatigue aging testing for flange-type pressure transmitters through innovative equipment structure and testing methods, overcoming the shortcomings of existing technologies. It has significant innovation and practicality, and can provide strong technical support for the high-quality production of flange-type pressure transmitters. Attached Figure Description

[0011] Figure 1 A schematic diagram illustrating the structure of this invention; Figure 2 This is an exploded view of the structure of the present invention; Figure 3 This is a schematic diagram of the tooling flange of the present invention; Figure 4 This is a schematic diagram of the connection structure of the tracheal connector I, tracheal connector II, air outlet pipe I, air outlet pipe II, and air circuit on / off switch of the present invention. Figure 5 This is a schematic diagram of the circuit connection of the solenoid valve, time relay and switching power supply of the present invention; Figure 6 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 9 This is a schematic diagram of the gas path and circuit connection according to an embodiment of the present invention.

[0012] In the diagram: 1. Flange-type pressure transmitter; 2. Equipment body; 2-1. Panel; 2-11. Air pipe connector I; 2-12. Air pipe connector II; 3. Tooling flange; 3-1. Circular groove; 3-2. Air outlet; 3-3. Air outlet connector I; 3-4. Air outlet connector II; 3-5. Stepped notch; 4. Electrical control cabinet; 5. Air circuit on / off switch; 6. Solenoid valve; 6-1. Air inlet port; 6-2. Air outlet port; 7. Time relay; 8. Switching power supply; 9. Air pipe I; 10. Air pipe II; 11. Gasket. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but should not be construed as limiting the invention. This embodiment aims to provide a device and corresponding testing method capable of simulating actual working conditions to perform fatigue aging tests on diaphragms, thereby ensuring high-quality production of flange-type pressure transmitters.

[0014] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a flange-type pressure transmitter diaphragm fatigue aging testing device includes a flange-type pressure transmitter 1, a main body 2, a tooling flange 3, an electrical control cabinet 4, an air circuit on / off switch 5, a solenoid valve 6, a time relay 7, a 24V DC power supply 8, air pipe I 9, air pipe II 10, and a gasket 11.

[0015] The flange-type pressure transmitter 1 is the device to be tested, and its diaphragm performance requires fatigue aging testing. The main body 2 serves as the support platform for the entire testing equipment. Multiple tooling flanges 3 of different diameters are fixed on its tabletop to accommodate pressure transmitters of different specifications. The tooling flange 3 is circular, with a circular groove 3-1 at the center of its upper surface. Two air outlets 3-2 are evenly distributed at the bottom of the groove, communicating with the circular groove 3-1. Air outlet connector I 3-3 and air outlet connector II 3-4 are fixed to the two air outlets 3-2 on the bottom surface of the tooling flange 3 for connecting to the air circuit system. Multiple stepped notches 3-5 are spaced along the circumference of the outer circumference of the tooling flange 3. These stepped notches 3-5 are adapted to fit the connection points of the flange-type pressure transmitter 1, ensuring the pressure transmitter can be securely mounted on the tooling flange 3 and sealed using gaskets 11. The tooling flange 3 is used to fix the flange-type pressure transmitter 1 to the flange-type pressure transmitter 1 using gaskets 11.

[0016] The electrical control cabinet 4 is located on the lower platform of the main body 2. It contains a solenoid valve 6, a DH48S-S time relay 7, and a 24V DC power supply 8. The time relay 7 is mounted on the electrical control cabinet 4. The solenoid valve 6 controls the on / off of the air circuit, and the time relay 7 controls the air supply and de-supply times of the solenoid valve. The 24V DC power supply 8 provides power to the solenoid valve and the time relay. An air circuit on / off switch 5 is mounted on the front panel 2-1 of the main body 2 to control the air circuit and switch the air circuit for different tooling flanges 3. Air pipes I 9 and II 10 connect the solenoid valve 6 to the air pipe connectors I 2-11 and II 2-12 fixed on panel 2-1, forming a complete air circuit system. A gasket 11 secures the flange-type pressure transmitter 1 to the tooling flange 3, ensuring a tight seal. The installation of the tooling flanges 3 involves fixing multiple tooling flanges 3 of different diameters to the table of the main body 2 of the equipment with bolts, arranged in two rows and four columns. The first column has two tooling flanges 3 with a diameter of DN25, the second and third columns each have two tooling flanges 3 with a diameter of DN50, and the fourth column has two tooling flanges 3 with a diameter of DN80. This arrangement can meet the testing requirements of pressure transmitters 1 of different specifications of flange type, and improve the versatility and flexibility of the equipment.

[0017] The air circuit is connected as follows: the two air outlet ports 6-2 of the solenoid valve 6 are connected to the air pipe connectors I2-11 and II2-12 fixed on any panel 2-1 via air pipe I9 and air pipe II10, respectively. The air pipe connector I2-11 on panel 2-1 is connected to the air outlet pipe I3-3 of the tooling flange 3 at the front end of the corresponding column via air pipe. The air pipe connector II2-12 is connected to the air outlet pipe I3-3 of the tooling flange 3 at the rear end of the corresponding column via air pipe. The air outlet pipe II3-4 of the tooling flange 3 at the front end is connected to the air outlet pipe II3-4 of the tooling flange 3 at the rear end via air circuit on / off switch 5.

[0018] Circuit connection: The positive terminal of the 24V DC power supply 8 is connected to pins 8 and 7 of the time relay 7, pin 6 of the time relay 7 is connected to the positive terminal of the three-way solenoid valve 6, and the negative terminal of the 24V DC power supply 8 is connected to pin 2 of the time relay 7 and the negative terminal of the three-way solenoid valve 6, forming a complete electrical control circuit.

[0019] Test method: Air source connection and pressure setting: Connect the external air source to the air inlet port 6-1 of the solenoid valve 6 through the pressure controller. The pressure controller can accurately adjust the pressure of the air source to a fixed value. According to the maximum range of the flange-type pressure transmitter 1 under test, set the pressure in the range of 3KPa to 1MPa to ensure that the test pressure matches the pressure that the pressure transmitter withstands in the actual working scenario. Pressure transmitter installation and air circuit adjustment: Select a tooling flange 3 of the corresponding diameter according to the diameter of the flange-type pressure transmitter 1, and fix it firmly to the tooling flange 3 with gasket 11; adjust the air circuit on / off switch 5 flexibly according to the number of flange-type pressure transmitters 1 that need to be tested. If two pressure transmitters in the same row need to be tested, open the air circuit on / off switch 5 to connect the two tooling flanges 3 in that row; if only one is to be tested, close the air circuit on / off switch 5 to disconnect the air circuit between the two tooling flanges 3.

[0020] Power Connection and Solenoid Valve Control: Connecting the 24V DC power supply 8 provides stable power to the time relay 7 and solenoid valve 6, enabling them to begin normal operation. The time relay 7 precisely controls the air supply and de-suction times of the solenoid valve 6 according to preset parameters. Under the control of the time relay 7, the solenoid valve 6 performs switching operations according to a set pattern, thereby achieving periodic on / off of the air circuit, simulating the frequent pressure changes experienced by the diaphragm during actual use.

[0021] Fatigue Aging Test and Performance Evaluation: After starting the equipment, the counter built into the time relay 7 is used to accumulate and count the number of switching cycles of the solenoid valve 6 in real time and with precision. The equipment runs continuously for 5000 cycles according to the set program. During this 5000-cycle repetitive fatigue process, the dislocation density of the diaphragm metal lattice is further reduced, and the internal stress remaining due to stamping, welding and other processes is effectively eliminated. After this process, the effective rigidity of the diaphragm will decrease by 8% to 12%, and its elastic hysteresis curve will tend to stabilize. After the stress relief cycle is completed, the pressure transmitter is immediately subjected to performance testing, and the pressure and time curves are measured. Zero drift less than or equal to 0.075%FS and full-scale hysteresis less than or equal to 0.075%FS are used as the pass criteria. If the test results meet the above criteria, it indicates that the internal stress of the diaphragm has been completely released, the diaphragm performance of the flange-type pressure transmitter 1 has reached the ideal state, and it can significantly reduce the subsequent measurement error caused by residual stress, ensuring high-precision measurement and stable operation of the pressure transmitter in practical applications. Through the above specific embodiments, the present invention can comprehensively and accurately simulate the fatigue aging of the diaphragm of the flange pressure transmitter during actual use, and scientifically and effectively evaluate the diaphragm performance, providing strong technical support and guarantee for the production quality control of the flange pressure transmitter.

[0022] Example 1, such as Figure 6 , Figure 9 As shown, this embodiment aims to test two flange-type pressure transmitters 1 with a specification of DN50, and evaluate the fatigue aging performance of their diaphragms using the testing equipment and method of the present invention. Equipment configuration: Select the two DN50 tooling flanges 3 in the third column for testing two DN50 flange-type pressure transmitters 1; air circuit connection: The two air outlet ports 6-2 of the solenoid valve 6 in the electrical control cabinet 4 are connected to the air pipe connectors I2-11 and II2-12 on the panel 2-1 via air pipe I9 and air pipe II10 respectively; the air pipe connector I2-11 on the panel 2-1 is connected to the air outlet pipe I3-3 of the DN50 tooling flange 3 at the front of the third column via an air pipe, and the air pipe connector II2-12 is connected to the air outlet pipe I3-3 of the DN50 tooling flange 3 at the rear of the third column via an air pipe; the air outlet pipe II3-4 of the DN50 tooling flange 3 at the front is connected to the air outlet pipe II3-4 of the DN50 tooling flange 3 at the rear via the air circuit on / off switch 5.

[0023] Circuit connection: The positive terminal of the 24V DC power supply 8 is connected to pins 8 and 7 of the time relay 7, and pin 6 of the time relay 7 is connected to the positive terminal of the three-way solenoid valve 6. The negative terminal of the 24V DC power supply 8 is connected to pin 2 of the time relay 7 and the negative terminal of the three-way solenoid valve 6, forming a complete electrical control circuit.

[0024] Test Procedure; Air Source Connection and Pressure Setting: Connect the external air source to the air inlet port 6-1 of the solenoid valve 6 via a pressure controller. The pressure controller precisely adjusts the air source pressure to the maximum range of the flange-type pressure transmitter 1 under test to ensure that the test pressure matches the pressure the pressure transmitter experiences in actual working conditions. Pressure Transmitter Installation and Air Circuit Adjustment: Fix the two DN50 flange-type pressure transmitters 1 to the two DN50 tooling flanges 3 in the third row using gaskets 11, ensuring a secure connection and good sealing. Adjust the air circuit on / off switch 5 to connect the air circuits of the two DN50 tooling flanges 3 in the third row, ensuring correct air circuit connection; Power Supply and Solenoid Valve Control: Connect the 24V DC power supply 8 to provide stable power support for the time relay 7 and the solenoid valve 6, enabling them to start normal operation. The time relay 7 controls the air supply and de-airing times of the solenoid valve 6 according to preset parameters. The air supply time is set to 1 second, and the de-airing time is set to 1 second to simulate the frequent pressure changes experienced by the diaphragm during actual use.

[0025] Fatigue aging test and performance evaluation: After the equipment is started, the counter built into the time relay 7 is used to accumulate and count the number of switching times of the solenoid valve 6 in real time and accurately. The equipment runs continuously for 5000 cycles according to the set program. During the repeated fatigue process of these 5000 cycles, the dislocation density of the metal lattice of the diaphragm of the flange-type pressure transmitter 1 is further reduced, and the internal stress remaining due to stamping, welding and other processes is effectively eliminated. After this process, the effective rigidity of the diaphragm decreases by 10%, and its elastic hysteresis curve tends to stabilize. After the stress relief cycle is completed, the performance of the two flange-type pressure transmitters 1 is immediately tested, and the pressure and time curves are measured. The zero drift is less than or equal to 0.075%FS and the full-scale hysteresis is less than or equal to 0.075%FS as the pass criteria. Through the test of this embodiment, the fatigue aging performance of the diaphragm of the two DN50 flange-type pressure transmitters 1 is effectively evaluated, ensuring high-precision measurement and stable operation in practical applications.

[0026] Example 2, as Figure 7 , Figure 9 As shown, this embodiment aims to test a DN50 flange-type pressure transmitter 1 and evaluate the fatigue aging performance of its diaphragm using the testing equipment and method of the present invention. Equipment configuration: Select the DN50 tooling flange 3 in the third column for testing a DN50 flange-type pressure transmitter 1. Air circuit connection: The two air outlet ports 6-2 of the solenoid valve 6 in the electrical control cabinet 4 are connected to air pipe connectors I2-11 and II2-12 on panel 2-1 via air pipes I9 and II10 respectively; air pipe connector II2-12 on panel 2-1 is connected to the air outlet pipe I3-3 of the DN50 tooling flange 3 at the rear end of the third column via an air pipe; the air outlet pipe II3-4 of the DN50 tooling flange 3 at the front end is connected to the air outlet pipe II3-4 of the DN50 tooling flange 3 at the rear end via the air circuit on / off switch 5. Disconnect air pipe I9 from air pipe connector I2-11 and plug both air pipe I9 and air pipe connector I2-11 to ensure the independence of the air circuit and the accuracy of the test.

[0027] Circuit connection: The positive terminal of the 24V DC power supply 8 is connected to pins 8 and 7 of the time relay 7, and pin 6 of the time relay 7 is connected to the positive terminal of the three-way solenoid valve 6. The negative terminal of the 24V DC power supply 8 is connected to pin 2 of the time relay 7 and the negative terminal of the three-way solenoid valve 6, forming a complete electrical control circuit.

[0028] Test Procedure; Air Source Connection and Pressure Setting: Connect the external air source to the inlet port 6-1 of the solenoid valve 6 via a pressure controller. The pressure controller precisely regulates the air source pressure to the maximum range of the flange-type pressure transmitter 1 under test, ensuring that the test pressure matches the pressure the pressure transmitter experiences in the actual working environment. Pressure Transmitter Installation and Air Circuit Adjustment: Fix a DN50 flange-type pressure transmitter 1 to the DN50 tooling flange 3 at the rear of the third column using gaskets 11, ensuring a secure connection and good sealing. Adjust the air circuit on / off switch 5 to disconnect the air outlet pipe II 3-4 of the DN50 tooling flange 3 at the rear of the third column from the air outlet pipe II 3-4 of the DN50 tooling flange 3 at the front, ensuring an independent air circuit. Check that the air pipe I 9 and the air pipe connector I 2-11 are disconnected and blocked, ensuring no leakage in the air circuit system; Power Connection and Solenoid Valve Control: Connect the 24V DC power supply 8 to provide stable power support for the time relay 7 and the solenoid valve 6, enabling them to start working normally. The time relay 7 controls the air supply and de-airing times of the solenoid valve 6 according to preset parameters. The air supply time is set to 1 second and the de-airing time to 1 second to simulate the frequent pressure changes that the diaphragm experiences during actual use.

[0029] Fatigue aging test and performance evaluation: After starting the equipment, the counter built into the time relay 7 is used to accumulate and count the number of switching times of the solenoid valve 6 in real time and accurately. The equipment runs continuously for 5000 cycles according to the set program. During this 5000-cycle repeated fatigue process, the dislocation density of the metal lattice of the diaphragm of the flange-type pressure transmitter 1 is further reduced, and the internal stress remaining due to stamping, welding and other processes is effectively eliminated. After this process, the effective rigidity of the diaphragm decreases by 10%, and its elastic hysteresis curve tends to stabilize. After the stress relief cycle is completed, the performance of the flange-type pressure transmitter 1 is immediately tested, and the pressure and time curves are measured. The zero drift is less than or equal to 0.075%FS and the full-scale hysteresis is less than or equal to 0.075%FS as the pass criteria. Through the test of this embodiment, the fatigue aging performance of the diaphragm of a DN50 flange-type pressure transmitter 1 is effectively evaluated, ensuring its high-precision measurement and stable operation in practical applications.

[0030] Example 3, as Figure 8 , Figure 9 As shown, this embodiment aims to test a DN50 flange-type pressure transmitter 1 and evaluate the fatigue aging performance of its diaphragm using the testing equipment and method of the present invention. Equipment configuration: Select the DN50 tooling flange 3 at the front of the third column for testing a DN50 flange-type pressure transmitter 1. Air circuit connection: The two air outlet ports 6-2 of the solenoid valve 6 in the electrical control cabinet 4 are connected to air pipe connectors I2-11 and II2-12 on panel 2-1 via air pipe I9 and air pipe II10 respectively; air pipe connector I2-11 on panel 2-1 is connected to the air outlet pipe I3-3 of the DN50 tooling flange 3 at the front of the third column via an air pipe; the air outlet pipe II3-4 of the front DN50 tooling flange 3 is connected to the air outlet pipe II3-4 of the rear DN50 tooling flange 3 via the air circuit on / off switch 5. Disconnect air pipe II10 from air pipe connector II2-12 and plug both air pipe II10 and air pipe connector II2-12 to ensure the independence of the air circuit and the accuracy of the test.

[0031] Circuit connection: The positive terminal of the 24V DC power supply 8 is connected to pins 8 and 7 of the time relay 7, and pin 6 of the time relay 7 is connected to the positive terminal of the three-way solenoid valve 6. The negative terminal of the 24V DC power supply 8 is connected to pin 2 of the time relay 7 and the negative terminal of the three-way solenoid valve 6, forming a complete electrical control circuit.

[0032] Test Procedure; Air Source Connection and Pressure Setting: Connect the external air source to the inlet port 6-1 of the solenoid valve 6 via a pressure controller. The pressure controller precisely regulates the air source pressure to the maximum range of the flange-type pressure transmitter 1 under test, ensuring that the test pressure matches the pressure the pressure transmitter experiences in the actual working environment. Pressure Transmitter Installation and Air Circuit Adjustment: Fix a DN50 flange-type pressure transmitter 1 to the DN50 tooling flange 3 at the front end of the third column using gaskets 11, ensuring a secure connection and good sealing. Adjust the air circuit on / off switch 5 to disconnect the air outlet pipe II 3-4 of the DN50 tooling flange 3 at the front end of the third column from the air outlet pipe II 3-4 of the DN50 tooling flange 3 at the rear end, ensuring an independent air circuit. Check that air pipe II 10 and air pipe connector II 2-12 are disconnected and blocked, ensuring no leaks in the air circuit system. Power Connection and Solenoid Valve Control: Connect the 24V DC power supply 8 to provide stable power support for the time relay 7 and the solenoid valve 6, enabling them to start normal operation. The time relay 7 controls the air supply and de-airing times of the solenoid valve 6 according to preset parameters. The air supply time is set to 1 second and the de-airing time to 1 second to simulate the frequent pressure changes that the diaphragm experiences during actual use.

[0033] Fatigue aging test and performance evaluation: After starting the equipment, the counter built into the time relay 7 is used to accumulate and count the number of switching times of the solenoid valve 6 in real time and accurately. The equipment runs continuously for 5000 cycles according to the set program. During this 5000-cycle repetitive fatigue process, the dislocation density of the diaphragm metal lattice of the flange-type pressure transmitter 1 is further reduced, and the internal stress remaining due to stamping, welding and other processes is effectively eliminated. After this process, the effective rigidity of the diaphragm decreases by 10%, and its elastic hysteresis curve tends to stabilize. After the stress relief cycle is completed, the performance of the flange-type pressure transmitter 1 is immediately tested, and the pressure and time curves are measured. Zero drift less than or equal to 0.075%FS and full-scale hysteresis less than or equal to 0.075%FS are used as the pass criteria. Through the test of this embodiment, the fatigue aging performance of the diaphragm of a DN50 flange-type pressure transmitter 1 is effectively evaluated, ensuring its high-precision measurement and stable operation in practical applications. This embodiment demonstrates the flexibility and reliability of the equipment of the present invention under different test positions and air circuit configurations.

[0034] For the two tooling flanges 3 of the same diameter DN25 in the first column and the two tooling flanges 3 of the same diameter DN80 in the fourth column, the test of the flange type pressure transmitter 1 of DN25 and the flange type pressure transmitter 1 of DN80 can be completed. The test method can be carried out according to the test steps of Example 1, Example 2 and Example 3.

Claims

1. A flange-type pressure transmitter diaphragm fatigue aging testing device, comprising a flange-type pressure transmitter (1), characterized in that: It also includes the main body of the equipment (2), tooling flanges (3), electrical control cabinet (4), air circuit on / off switch (5), solenoid valve (6), time relay (7), 24V DC power supply (8), air pipe I (9), air pipe II (10), and gasket (11); the solenoid valve (6) and the 24V DC power supply (8) are both installed in the electrical control cabinet (4), and the time relay (7) is set on the control cabinet (4); multiple tooling flanges (3) of different diameters are fixed on the table of the main body of the equipment (2), and each tooling flange (3) is provided with an air outlet. Pipe I (3-3) and air outlet pipe II (3-4) extend from under the table of the main body of the equipment (2) to connect to the air circuit; the front of the main body of the equipment (2) is provided with multiple panels (2-1) at intervals, each panel (2-1) is provided with air pipe connector I (2-11), air pipe connector II (2-12) and air circuit on / off switch (5) for controlling and connecting the air circuit; the air pipe connector I (2-11) on the multiple panels (2-1) is connected to the air outlet pipe I (3-3) of the tooling flange (3) at the front end of the corresponding row, and the air outlet pipes on the multiple panels (2-1) are connected to the air outlet pipes ... tooling flange (3) of the tooling flange (3) of the tooling flange (3-4) of the tooling flange (3-4) of the tooling flange (3-4) of the tooling flange (3-3) of the tooling flange (3-4) of the tooling flange (3-3) of the tooling flange (3-4) of the tooling flange (3-3) of the tooling flange (3-4) of the tooling flange (3-3) of the tooling flange (3-4) of the tooling flange (3-3) of the tooling flange (3-4) of the tooling flange (3-3) of the tooling flange (3-4) of the Pipe connector II (2-12) is connected to the air outlet pipe I (3-3) of the tooling flange (3) at the rear end of the corresponding column, and the air outlet pipe II (3-4) of the tooling flange (3) at the front end is connected to the air outlet pipe II (3-4) of the tooling flange (3) at the rear end through the air circuit on / off switch (5); the electrical control cabinet (4) is set on the lower platform of the equipment body (2), and the two air outlet ports (6-2) of the solenoid valve (6) in the electrical control cabinet (4) are respectively connected to the air pipe connector I on any panel (2-1) through air pipe I (9) and air pipe II (10). (2-11) and air pipe connector II (2-12) are connected. The air inlet port (6-1) of the solenoid valve (6) is connected to the fixed air source output by the pressure controller to provide a stable test air pressure. The flange type pressure transmitter (1) is fixed on the tooling flange (3) of the corresponding diameter by gasket (11) according to its diameter to ensure the stability and sealing of the pressure transmitter during the test. The circuit connection is as follows: the 24V DC power supply (8) is connected to the time relay (7) and the three-way solenoid valve (6) respectively. The time relay (7) and the three-way solenoid valve (6) are connected.

2. The flange-type pressure transmitter diaphragm fatigue aging testing equipment according to claim 1, characterized in that: The tooling flange (3) is a circular body. A circular groove (3-1) is provided at the center of the upper surface of the tooling flange (3). Two air outlets (3-2) are evenly distributed at the bottom of the circular groove (3-1). On the bottom surface of the tooling flange (3), air outlet pipe I (3-3) and air outlet pipe II (3-4) are fixed on the two air outlets (3-2) respectively for connecting the air circuit system. On the outer circumferential surface of the tooling flange (3), multiple stepped notches (3-5) are provided at intervals along the circumferential direction. The stepped notches (3-5) are used to match the connection part of the flange-type pressure transmitter (1) to ensure that the pressure transmitter can be stably installed on the tooling flange (3) and achieve a sealed connection through the gasket (11).

3. The flange-type pressure transmitter diaphragm fatigue aging testing equipment according to claim 1, characterized in that: The specific structure of the multiple tooling flanges (3) of different diameters fixed on the table of the equipment body (2) is as follows: the multiple tooling flanges (3) of different diameters are arranged on the table of the equipment body (2) according to a certain arrangement rule, specifically arranged in two rows and four columns. The first column consists of two tooling flanges (3) of the same diameter and DN25, the second and third columns consist of two tooling flanges (3) of the same diameter and DN50, and the fourth column consists of two tooling flanges (3) of the same diameter and DN80.

4. A test method using the flange-type pressure transmitter diaphragm fatigue aging test equipment as described in claim 1, characterized in that, The steps are as follows: Step 1, connect the external air source to the air inlet port (6-1) of the solenoid valve (6) through the pressure controller. The pressure controller can accurately adjust the pressure of the air source to a fixed value. According to the maximum range of the flange-type pressure transmitter (1) under test, set the pressure in the range of 3KPa to 1MPa to ensure that the test pressure matches the pressure that the pressure transmitter bears in the actual working scenario, so as to provide accurate and reasonable initial pressure conditions for the diaphragm fatigue aging test; connect the two air outlet ports (6-2) of the solenoid valve (6) in the electrical control cabinet (4) through air pipe I (9) and air pipe II (9) respectively. 10) Connect to the air pipe connector I (2-11) and air pipe connector II (2-12) on the front panel (2-1) of any equipment body (2), ensuring that the air pipe connector I (2-11) on the panel (2-1) is connected to the air outlet pipe I (3-3) of the tooling flange (3) at the front end of the corresponding column through the air pipe, and the air pipe connector II (2-12) is connected to the air outlet pipe I (3-3) of the tooling flange (3) at the rear end of the corresponding column through the air pipe, and the air outlet pipe II (3-4) of the tooling flange (3) at the front end is connected to the air outlet pipe II (3-4) of the tooling flange (3) at the rear end through the air circuit on / off switch (5); Step 2: Select a tooling flange (3) of the corresponding diameter according to the diameter of the flange-type pressure transmitter (1), and fix it firmly to the tooling flange (3) with a gasket (11). Adjust the air circuit on / off switch (5) flexibly according to the number of flange-type pressure transmitters (1) to be tested. If two pressure transmitters in the same row need to be tested, connect the two tooling flanges (3) in that row; if only one is to be tested, disconnect the air circuit between the two tooling flanges (3) to ensure that the air circuit connection is correct and to provide a suitable testing environment for different numbers of pressure transmitters. Step 3: Connect the 24V DC power supply (8) to provide stable power support for the time relay (7) and the solenoid valve (6) so that they can start working normally. The time relay (7) accurately controls the air supply time and air cut-off time of the solenoid valve (6) according to the preset parameters. Under the control of the time relay (7), the solenoid valve (6) performs switching operation according to the set rules, thereby realizing the periodic opening and closing of the air circuit and simulating the situation where the diaphragm is frequently subjected to pressure changes during actual use. Step 4: After starting the equipment, use the counter built into the time relay (7) to accumulate and count the number of switching times of the solenoid valve (6) in real time and accurately. The equipment runs continuously for 5000 cycles according to the set program. During the repeated fatigue process of these 5000 cycles, the dislocation density of the diaphragm metal lattice is further reduced, and the internal stress remaining due to the stamping and welding process is effectively eliminated. After this process, the effective rigidity of the diaphragm will decrease by 8% to 12%, and its elastic hysteresis curve will also tend to stabilize. After completing the stress relief cycle, the pressure transmitter is immediately tested for performance. The pressure and time curves are measured. The zero drift is less than or equal to 0.075%FS and the full-range hysteresis is less than or equal to 0.075%FS as the qualification criteria. If the test results meet the above criteria, it indicates that the internal stress of the diaphragm has been completely released, and the diaphragm performance of the flange-type pressure transmitter (1) has reached the ideal state. It can significantly reduce the subsequent measurement error caused by residual stress and ensure the high-precision measurement and stable operation of the pressure transmitter in actual applications.

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