Pneumatic actuator dynamic load test equipment and test method thereof

Abstract

The present application relates to a kind of pneumatic actuator dynamic load test equipment and its test method, it is related to valve actuator test field.The tooling assembly of the technical solution realizes the stable assembly of the measured piece and overall support, connection assembly is completed power conversion and transfer, control assembly and adjusting assembly are symmetrical linkage, can realize the wide range of dynamic load torque, high-precision automatic regulation and control, adapt to different specifications measured actuator, without frequent replacement tooling, substantially improve test efficiency.Monitoring component real-time capture torque dynamic change and visual presentation, combined with automated test process, realize load setting, test execution, data acquisition, stability verification and report export integration, ensure that test data is real and reliable, test process controllable and efficient.At the same time, the optimization design of each sealing, guiding component, ensure that equipment runs stably, wear is small, sealing is good, prolong the service life of equipment.

Description

Technical Field

[0001] This invention relates to the field of valve actuator testing technology, and in particular to a dynamic load testing device and testing method for pneumatic actuators. Background Technology

[0002] Angular stroke valve actuators are key equipment in industrial process control. The accuracy of their output torque and dynamic response characteristics directly determine the control precision and operational reliability of the valve, thus affecting the stability and safety of the entire industrial control system. Therefore, before leaving the factory, angular stroke valve actuators must undergo rigorous load testing to verify their performance indicators and ensure that the products meet industrial application requirements. This is an indispensable step before the actuators are put into actual use.

[0003] However, the traditional load testing equipment widely used in the industry currently has many shortcomings, making it difficult to meet the high-precision and diverse testing needs: First, it has poor compatibility, unable to adapt to actuators of various installation sizes such as F14 to F48 under the ISO 5211 standard. Frequent changes of tooling fixtures are required when testing different specifications of products, significantly reducing testing efficiency. Second, the load simulation is distorted. Most testing equipment can only provide static torque loads, failing to realistically simulate the dynamic torque characteristics of valves during actual opening and closing due to changes in medium pressure. This results in significant deviations between test results and actual operating conditions, making it difficult to accurately reflect the actual working performance of the actuator. Third, the adjustment range is narrow and the operation is complex. Most testing equipment can only provide fixed torque loads. Even some adjustable devices require manual mechanical adjustment, making it impossible to achieve wide-range, high-precision dynamic torque control. Fourth, it lacks real-time monitoring capabilities, failing to collect and feedback dynamic torque change data in real time during the testing process, making it difficult to accurately evaluate the dynamic response performance of the actuator. Summary of the Invention

[0004] The purpose of this invention is to provide a dynamic load testing device and method for pneumatic actuators to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a dynamic load testing device for a pneumatic actuator, comprising: The tooling assembly includes a tooling bracket, a monitoring platform mounted on top of the tooling bracket, a connecting bracket mounted on top of the monitoring platform, and a mounting bracket mounted on the inner top of the tooling bracket. A connecting assembly, located inside the tooling bracket, includes a housing mounted on the bottom of the mounting bracket, a curved arm rotatably disposed within the housing in a vertical direction, and a connecting block hinged to the curved arm; The control component and the adjustment component are located inside the tooling bracket. They are respectively installed on both sides of the connecting component. The load torque output ends of both are connected to the connecting block for transmission. The two cooperate to provide dynamic load torque. The tooling assembly further includes a mounting short shaft, a connecting short shaft, and a monitoring component. The first end of the mounting short shaft passes through the central cavity of the crank arm, and the second end of the mounting short shaft passes through the mounting bracket and extends into the monitoring platform. The first end of the connecting short shaft is drivenly connected to the output end of the actuator under test, and the second end of the connecting short shaft passes through the connecting bracket and extends into the monitoring platform, where it is drivenly connected to the second end of the mounting short shaft. The monitoring component is disposed on the monitoring platform and is used to collect and provide feedback on the dynamic changes in torque during the testing process in real time.

[0006] In some embodiments, the monitoring component includes: A dynamic torque sensor is installed at the connection between the second end of the connecting short shaft and the second end of the mounting short shaft, and is used to collect dynamic torque change data in real time during the test process; An integrated pneumatic control accessory assembly is installed inside the monitoring station to receive test data collected by the dynamic torque sensor and feed it back to the parameter display screen for real-time display.

[0007] In some embodiments, the control component includes: A control cylinder body, on which a front control cylinder head and a rear control cylinder head are respectively installed on both sides, the front control cylinder head being connected to the housing body; A limiting piston is disposed in the control cylinder body along the axial direction of the control cylinder body, is adjustablely mounted on the control cylinder head, and has a through central vent hole. A control piston is disposed within the control cylinder along the axial direction of the control cylinder body, and a control compression spring is installed between the control piston and the limiting piston. The control push rod has its first end sealed and installed in the center hole of the control piston, and its second end extends through the control front cylinder head and into the housing, where it is connected to the connecting block in a transmission manner. Both the front and rear cylinder heads of the control unit are provided with air source holes, which are connected to external compressed air through air pipes. An electro-proportional valve is installed on the air pipes, and the electro-proportional valve is electrically connected to the integrated pneumatic control accessory group of the monitoring component, so that the integrated pneumatic control accessory group can adjust the load torque according to the specifications of the actuator under test.

[0008] In some embodiments, the adjustment component includes: An adjusting cylinder body, on which a front adjusting cylinder head and a rear adjusting cylinder head are respectively installed on both sides, the front adjusting cylinder head being connected to the housing body; An adjusting piston is disposed axially within the adjusting cylinder body and is adjustablely mounted on the rear adjusting cylinder head. An adjusting compression spring is installed between the adjusting piston and the front adjusting cylinder head. The adjusting push rod has its first end installed in the center hole of the adjusting piston, and its second end passing through the adjusting front cylinder head and extending into the housing, where it is connected to the connecting block in a driving manner.

[0009] In some embodiments, a box cover is installed at the bottom of the box body, and the first end of the mounting short shaft is rotatably connected to the center hole of the box body and the center hole of the box cover through an oil-free bushing and an oil-free bushing, respectively. An end cap is installed at the bottom of the center hole of the box cover. The connecting block is hinged to the crank arm via a pressure plate and a pin. The housing and the control front cylinder head of the control component, and the housing and the adjustment front cylinder head of the adjustment component are all connected by equal-length double-ended studs and hexagonal thin nuts. An O-ring is provided between the mounting short shaft and the center hole of the housing, an O-ring is provided between the end cap and the center hole of the housing cover, and an O-ring is provided on the bottom mating surface of the housing cover and the housing body.

[0010] In some embodiments, the limiting piston is adjustablely mounted on the control rear cylinder head via a limiting bolt and a tightening nut; The mating surfaces of the control cylinder head and the control cylinder body are provided with O-ring seals. The mating surfaces of the control cylinder head and the control cylinder body are provided with O-ring seals, and the mating surfaces of the control cylinder head and the housing are provided with O-ring seals. An O-ring and a PTFE guide strip are arranged side by side between the limiting piston and the inner cavity of the control cylinder. An O-ring and a PTFE guide strip are arranged side by side between the control piston and the inner cavity of the control cylinder.

[0011] In some embodiments, two O-rings are arranged side by side between the control push rod and the center hole of the control piston, and the control push rod is fixed to the control piston by a retaining ring; The control push rod is movably connected to the center hole of the control front cylinder head through an oil-free bushing, and an O-ring is also provided between the control push rod and the center hole of the control front cylinder head.

[0012] In some embodiments, the adjusting piston is adjustablely mounted on the adjusted rear cylinder head via an adjusting bolt and a tightened nut; An O-ring is provided on the mating surface between the adjusted cylinder head and the adjusted cylinder body; The mating surfaces of the front cylinder head and the cylinder body are provided with O-ring seals, and the mating surfaces of the front cylinder head and the housing are provided with O-ring seals. An O-ring and a PTFE guide strip are arranged side by side between the adjusting piston and the inner cavity of the adjusting cylinder. The adjusting push rod is fixed to the adjusting piston by a hexagonal thin nut. The adjusting push rod is movably connected to the center hole of the adjusting front cylinder head by an oil-free bushing. An O-ring is also provided between the adjusting push rod and the center hole of the adjusting front cylinder head.

[0013] In some embodiments, the connecting bracket fixes the actuator of the measured angle stroke with hexagonal head bolts, the connecting bracket is connected to the monitoring station with equal-length double-ended studs and hexagonal nuts, the monitoring station, the tooling bracket and the mounting bracket are connected with equal-length double-ended studs and hexagonal nuts, the mounting bracket is connected to the housing with hexagonal head bolts, and the bottom of the tooling bracket is provided with multiple foot pads.

[0014] Secondly, the present invention provides a dynamic load testing method for a pneumatic actuator, the method being applied to the aforementioned dynamic load testing equipment for a pneumatic actuator, the method comprising: S1. Before the test, the operator inputs the test parameters through the parameter display screen. The test parameters shall include at least the model of the actuator to be tested, the test torque range, and the dynamic load curve information. S2. After receiving the preset parameters, the integrated pneumatic control accessory group automatically calculates the required air source pressure and spring preload for the test. Then, it drives the electric proportional valve connected to the air source port of the control component, as well as the limit bolt of the control component and the adjusting bolt of the adjustment component to work together. By adjusting the limit bolt, the preload and compression of the control compression spring are changed, and by adjusting the adjusting bolt, the preload and compression of the adjustment compression spring are changed, thus completing the setting of the dynamic load torque and ensuring that the load parameters are completely matched with the test requirements of the angular stroke actuator under test. S3. After the load setting is completed, the air supply action command of the actuator of the angle to be measured is triggered. After the actuator of the angle to be measured is ventilated, it starts to move. Its output power is transmitted to the monitoring station through the connecting short shaft, and then through the installation short shaft transmission, it drives the crank arm installed in the box in the connecting assembly to rotate. S4. When the crank arm rotates, the connecting block, which is hinged to it via a pressure plate and a pin, synchronously drives the control push rod of the control component and the adjustment push rod of the adjustment component to perform linear reciprocating motion. The control push rod drives the control piston of the control component to reciprocate within the control cylinder, and the adjustment push rod drives the adjustment piston of the adjustment component to reciprocate within the adjustment cylinder. During the reciprocating motion of the two pistons, they compress the corresponding compression springs respectively, so that the test equipment forms a stable dynamic load torque. At the same time, the dynamic torque sensor in the monitoring component collects the dynamic torque change signal in real time. After the data is processed by the integrated pneumatic control accessory group, it is output in real time through the parameter display screen, and the response time and torque overshoot index of the actuator under test are recorded synchronously. S5. After the basic load test is completed, the integrated pneumatic control accessory group automatically switches to different levels of torque load through a preset program, or conducts multi-cycle cyclic tests to continuously monitor the stability of the angular stroke actuator under different loads and different number of cycles, comprehensively verify its long-term operating performance, and ensure the comprehensiveness and reliability of the test results. After all test procedures are completed, the integrated pneumatic control accessory group automatically generates and exports a complete test report, compares and analyzes the measured performance data of the angular stroke actuator under test with the preset design indicators, and clearly presents the product performance compliance status.

[0015] The beneficial effects of the technical solution provided by this invention include at least the following: The tooling components of this technical solution ensure stable assembly and overall support of the test piece, while the connecting components facilitate power conversion and transfer. The control and adjustment components work in symmetrical linkage, enabling wide-range, high-precision automatic control of dynamic load torque. This allows for adaptation to different specifications of actuators under test, eliminating the need for frequent tooling changes and significantly improving testing efficiency. Monitoring components capture and visualize dynamic torque changes in real time. Combined with an automated testing process, it integrates load setting, test execution, data acquisition, stability verification, and report export, ensuring reliable test data and a controllable and efficient testing process. Furthermore, the optimized design of various sealing and guiding components guarantees stable equipment operation, minimal wear, and excellent sealing, extending the equipment's service life and meeting the high standards required for performance verification of diagonal stroke actuators in the industrial field. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] Figure 1 A schematic diagram of the structure of a dynamic load testing device for a pneumatic actuator provided in an exemplary embodiment of the present invention is shown.

[0018] Figure 2A schematic diagram of the connection components of a dynamic load testing device for pneumatic actuators provided in an exemplary embodiment of the present invention is shown.

[0019] Figure 3 A schematic diagram of the control component of a dynamic load testing device for pneumatic actuators provided in an exemplary embodiment of the present invention is shown.

[0020] Figure 4 A schematic diagram of the adjustment component of a dynamic load testing device for a pneumatic actuator provided in an exemplary embodiment of the present invention is shown.

[0021] In the picture: 1. Control Components; 1-1. Tightening Nut; 1-2. Limit Bolt; 1-3. Control Rear Cylinder Head; 1-4. O-ring Seal; 1-5. Limit Piston; 1-6. O-ring Seal; 1-7. PTFE Guide Strip; 1-8. Control Compression Spring; 1-9. Control Push Rod; 1-10. Oil-Free Bushing; 1-11. O-ring Seal; 1-12. O-ring Seal; 1-13. Control Front Cylinder Head; 1-14. O-ring Seal; 1-15. O-ring Seal; 1-16. PTFE Guide Strip; 1-17. Control Piston; 1-18. O-ring Seal; 1-19. Snap Ring; 1-20. Control Cylinder Block; 2. Connecting components; 2-1. Housing; 2-2. Equal-length double-ended studs; 2-3. Hexagonal thin nuts; 2-4. Housing cover; 2-5. End caps; 2-6. Crank arm; 2-7. Pressure plate; 2-8. Pin; 2-9. Connecting block; 2-10. Oil-free bushing; 2-11. Oil-free bushing; 2-12. O-ring seal; 2-13. O-ring seal; 2-14. O-ring seal; 3. Adjustment components; 3-1. O-ring seal; 3-2. Oil-free bushing; 3-3. O-ring seal; 3-4. Adjusting front cylinder head; 3-5. O-ring seal; 3-6. Adjusting compression spring; 3-7. Adjusting push rod; 3-8. Adjusting piston; 3-9. O-ring seal; 3-10. PTFE guide band; 3-11. O-ring seal; 3-12. Adjusting bolt; 3-13. Tightening nut; 3-14. Hexagonal thin nut; 3-15. Adjusting rear cylinder head; 3-16. Adjusting cylinder block; 4. Tooling components; 4-1. Hex head bolts; 4-2. Connecting brackets; 4-3. Hex nuts; 4-4. Equal-length double-ended studs; 4-5. Monitoring station; 4-6. Integrated pneumatic control accessory assembly; 4-7. Hex nuts; 4-8. Equal-length double-ended studs; 4-9. Mounting brackets; 4-10. Hex head bolts; 4-11. Mounting short shaft; 4-12. Tooling brackets; 4-13. Parameter display screen; 4-14. Connecting short shaft; 4-15. Foot pads; 4-16. Dynamic torque sensor; 5. Stroke actuator for the angle to be measured. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "multiple" means two or more.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This diagram illustrates the structure of a dynamic load testing device for pneumatic actuators provided in an exemplary embodiment of the present invention. Figure 2This diagram illustrates the structure of a connection assembly of a dynamic load testing device for a pneumatic actuator according to an exemplary embodiment of the present invention. The dynamic load testing device includes: a tooling assembly 4, comprising a tooling bracket 4-12, a monitoring platform 4-5 mounted on the top of the tooling bracket 4-12, a connecting bracket 4-2 mounted on the top of the monitoring platform 4-5, and a mounting bracket 4-9 mounted inside the tooling bracket 4-12; a connection assembly 2, located inside the tooling bracket 4-12, comprising a housing 2-1 mounted on the bottom of the mounting bracket 4-9, a crank arm 2-6 rotatably disposed within the housing 2-1 in a vertical direction, and a connecting block 2-9 hinged to the crank arm 2-6; a control assembly 1 and an adjustment assembly 3, both located inside the tooling bracket 4-12, and respectively mounted on... On both sides of the connecting component 2, the load torque output ends of both are connected to the connecting block 2-9, and the two cooperate to provide dynamic load torque. The tooling component 4 also includes a mounting short shaft 4-11, a connecting short shaft 4-14, and a monitoring component. The first end of the mounting short shaft 4-11 passes through the middle cavity of the crank arm 2-6, and the second end of the mounting short shaft 4-11 passes through the mounting bracket 4-9 and extends into the monitoring platform 4-5. The first end of the connecting short shaft 4-14 is connected to the output end of the angular stroke actuator 5 to be tested, and the second end of the connecting short shaft 4-14 passes through the connecting bracket 4-2 and extends into the monitoring platform 4-5, and is connected to the second end of the mounting short shaft 4-11. The monitoring component is set on the monitoring platform 4-5 and is used to collect and provide feedback on the dynamic changes in torque during the test in real time.

[0026] In this embodiment, the connecting bracket 4-2 of the tooling assembly 4 ensures the stable assembly of the angular travel actuator 5 under test, preventing displacement deviation during testing; the mounting bracket 4-9 provides positioning for the connecting assembly 2, ensuring power transmission. The connecting assembly 2 performs power conversion and transfer functions, the housing 2-1 provides protection and rotation limit for the crank arm 2-6, and the crank arm 2-6 cooperates with the connecting block 2-9 to convert the rotational power of the test piece into linear power, connecting the control assembly 1 and the adjustment assembly 3. The control assembly 1 and the adjustment assembly 3 are symmetrically arranged, working together to output a stable dynamic load torque to adapt to different testing requirements; the mounting short shaft 4-11 and the connecting short shaft 4-14 form a complete transmission link to ensure power transmission; the monitoring component is located on the monitoring platform 4-5 to capture torque changes in real time, providing reliable data for test evaluation.

[0027] In some embodiments, see Figure 1The monitoring components include: a dynamic torque sensor 4-16, which is installed at the connection between the second end of the short shaft 4-14 and the second end of the short shaft 4-11, for real-time acquisition of dynamic torque change data during the test; and an integrated pneumatic control accessory group 4-6, which is located inside the monitoring platform 4-5, for receiving the test data acquired by the dynamic torque sensor 4-16 and feeding it back to the parameter display screen 4-13 for real-time display.

[0028] In this embodiment, the dynamic torque sensor 4-16 is installed at the connection between the short shaft 4-14 and the mounting short shaft 4-11. This location is a power transmission node, which can directly capture dynamic changes in torque, ensuring the authenticity and real-time nature of the collected data. The integrated pneumatic control accessory group 4-6 is located inside the monitoring platform 4-5, which can quickly receive the signals collected by the dynamic torque sensor 4-16, complete the preliminary data processing and transmission, and link the parameter display screen 4-13 to realize real-time visualization of the test data, making it convenient for operators to intuitively monitor the test status and promptly detect anomalies. At the same time, it provides data basis for the dynamic adjustment of the load torque. The overall setup ensures the controllability of the test process and the accuracy of the test results.

[0029] In some embodiments, see Figure 1 and Figure 3 The control assembly 1 includes: a control cylinder body 1-20, on which a front control cylinder head 1-13 and a rear control cylinder head 1-3 are respectively mounted, the front control cylinder head 1-13 being connected to the housing 2-1; a limiting piston 1-5, which is axially disposed within the control cylinder body 1-20 and adjustablely mounted on the rear control cylinder head 1-3, and has a through central vent hole; a control piston 1-17, which is axially disposed within the control cylinder body 1-20, and a control compression spring 1-8 is installed between the control piston 1-17 and the limiting piston 1-5; and a control push... Rod 1-9 has its first end sealed and installed in the center hole of control piston 1-17, and its second end extends through control front cylinder head 1-13 and into housing 2-1, where it is connected to connecting block 2-9. Both control front cylinder head 1-13 and control rear cylinder head 1-3 are provided with air source holes, which are connected to external compressed air through air pipes. An electric proportional valve is installed on the air pipe, which is electrically connected to the integrated pneumatic control accessory group 4-6 of the monitoring component, so that the integrated pneumatic control accessory group 4-6 can adjust the load torque according to the specifications of the measured angular stroke actuator 5.

[0030] In this embodiment, the control cylinder 1-20, together with the control front cylinder head 1-13 and the control rear cylinder head 1-3, forms a sealed chamber, providing a stable environment for the operation of internal components. The limiting piston 1-5 is adjustablely mounted on the control rear cylinder head 1-3, with its central vent ensuring airflow. Together with the control compression spring 1-8 and the control piston 1-17, it forms the basis for load torque adjustment, flexibly adapting to different torque requirements. The control push rod 1-9 connects the control piston 1-17 to the connecting block 2-9, transmitting power from inside the cylinder to the connecting assembly 2. The air source port, air pipe, and electro-proportional valve, linked with the integrated pneumatic control accessory group 4-6, achieve automatic adjustment of load torque without manual operation, significantly improving testing efficiency and control accuracy.

[0031] In some embodiments, see Figure 1 and Figure 4 The adjusting assembly 3 includes: an adjusting cylinder body 3-16, on which an adjusting front cylinder head 3-4 and an adjusting rear cylinder head 3-15 are respectively installed, the adjusting front cylinder head 3-4 being connected to the housing 2-1; an adjusting piston 3-8, which is axially disposed within the adjusting cylinder body 3-16 and is adjustablely mounted on the adjusting rear cylinder head 3-15, with an adjusting compression spring 3-6 installed between it and the adjusting front cylinder head 3-4; and an adjusting push rod 3-7, the first end of which is installed in the center hole of the adjusting piston 3-8, and the second end of which passes through the adjusting front cylinder head 3-4 and extends into the housing 2-1, and is connected to the connecting block 2-9 in a transmission manner.

[0032] In this embodiment, the adjusting cylinder 3-16 provides a stable mounting and movement space for the internal components, while the adjusting front cylinder head 3-4 and adjusting rear cylinder head 3-15 cooperate to seal the cylinder. The adjusting piston 3-8 is adjustablely mounted on the adjusting rear cylinder head 3-15. By adjusting the position of the adjusting piston 3-8, the spring compression is changed, enabling flexible fine-tuning of the load torque. The adjusting push rod 3-7 connects the adjusting piston 3-8 and the connecting block 2-9, converting the elastic force within the adjusting cylinder 3-16 into power and transmitting it to the connecting assembly 2, ensuring that the adjusted load torque is stably applied to the test link.

[0033] In some embodiments, see Figure 1 and Figure 2The bottom of the housing 2-1 is fitted with a cover 2-4. The first end of the mounting short shaft 4-11 is rotatably connected to the center hole of the housing 2-1 and the center hole of the cover 2-4 via oil-free bushings 2-10 and 2-11 respectively. An end cap 2-5 is installed at the bottom of the center hole of the cover 2-4. The connecting block 2-9 is hinged to the crank arm 2-6 via a pressure plate 2-7 and a pin 2-8. The housing 2-1 and the control front cylinder head 1-13 of the control component 1, and the housing 2-1 and the adjustment front cylinder head 3-4 of the adjustment component 3 are connected by equal-length double-ended studs 2-2 and hexagonal thin nuts 2-3. An O-ring 2-12 is provided between the mounting short shaft 4-11 and the center hole of the housing 2-1, an O-ring 2-13 is provided between the end cap 2-5 and the center hole of the cover 2-4, and an O-ring 2-14 is provided on the bottom mating surface of the cover 2-4 and the housing 2-1.

[0034] In this embodiment, the cover 2-4 is installed at the bottom of the housing 2-1, forming a closed protective structure with the end cover 2-5 to prevent internal components from being affected by dust and impurities. Oil-free bushings 2-10 and 2-11 cooperate with the housing 2-1 and cover 2-4 respectively, ensuring the short shaft 4-11 rotates flexibly and is accurately positioned, reducing rotational wear. The pressure plate 2-7, in conjunction with the pin 2-8, achieves a stable hinge connection between the connecting block 2-9 and the crank arm 2-6, ensuring that power transmission is smooth and without deviation, and guaranteeing that the crank arm 2-6 can synchronously drive the connecting block 2-9 when rotating. Equal-length double-ended studs 2-2, in conjunction with hexagonal thin nuts 2-3, achieve a rigid connection between the housing 2-1 and the control front cylinder head 1-13 and the adjustment front cylinder head 3-4, ensuring the coaxiality of the load assembly and the connecting assembly 2. O-rings 2-12, 2-13, and 2-14 seal each mating surface to prevent oil and gas leakage.

[0035] In some embodiments, see Figure 1 and Figure 3 The limiting piston 1-5 is adjustablely mounted on the control rear cylinder head 1-3 by engaging the limiting bolt 1-2 and tightening the nut 1-1; the mating surface of the control rear cylinder head 1-3 and the control cylinder body 1-20 is provided with an O-ring seal 1-4; the mating surface of the control front cylinder head 1-13 and the control cylinder body 1-20 is provided with an O-ring seal 1-12, and the mating surface of the control front cylinder head 1-13 and the housing 2-1 is provided with an O-ring seal 1-14; an O-ring seal 1-6 and a PTFE guide strip 1-7 are arranged side by side between the limiting piston 1-5 and the inner cavity of the control cylinder body 1-20; an O-ring seal 1-15 and a PTFE guide strip 1-16 are arranged side by side between the control piston 1-17 and the inner cavity of the control cylinder body 1-20.

[0036] In this embodiment, the limiting bolt 1-2 engages with and tightens the nut 1-1, enabling the adjustable installation of the limiting piston 1-5 on the control rear cylinder head 1-3. This allows for flexible adjustment of the position of the limiting piston 1-5 to adapt to different load requirements, and the adjustable position can be locked to prevent displacement during testing from affecting torque accuracy. O-rings 1-4, 1-12, and 1-14 respectively seal the mating surfaces of the control rear cylinder head 1-3 and control cylinder 1-20, the control front cylinder head 1-13 and control cylinder 1-20, and the housing 2-1. O-ring 1-6 seals the inner cavity of the limiting piston 1-5 and control cylinder 1-20 to prevent gas leakage. PTFE guide strips 1-7 and 1-16 engage with the limiting piston 1-5 and control piston 1-17 respectively, reducing wear during piston movement, providing guidance, and preventing jamming.

[0037] In some embodiments, see Figure 1 and Figure 3 Two O-rings 1-18 are arranged side by side between the center hole of the control push rod 1-9 and the control piston 1-17. The control push rod 1-9 is fixed to the control piston 1-17 by a retaining ring 1-19. The control push rod 1-9 is movably connected to the center hole of the control front cylinder head 1-13 by an oil-free bushing 1-10. An O-ring 1-11 is also provided between the control push rod 1-9 and the center hole of the control front cylinder head 1-13.

[0038] In this embodiment, the retaining ring 1-19 secures the control push rod 1-9 and the control piston 1-17, preventing relative displacement and ensuring complete transmission of piston power to the push rod. Two O-rings 1-18 are arranged side-by-side to enhance the sealing performance of the central holes of the control push rod 1-9 and the control piston 1-17, preventing air leakage from affecting load stability. The oil-free bushing 1-10 enables flexible movement between the control push rod 1-9 and the central hole of the control front cylinder head 1-13, reducing wear and providing precise guidance. The O-ring 1-11 further seals the mating surfaces.

[0039] In some embodiments, see Figure 1 and Figure 4The adjusting piston 3-8 is adjustablely mounted on the adjusting rear cylinder head 3-15 by adjusting bolt 3-12 and tightening nut 3-13; O-ring seals 3-11 are provided on the mating surfaces of the adjusting rear cylinder head 3-15 and the adjusting cylinder body 3-16; O-ring seals 3-5 are provided on the mating surfaces of the adjusting front cylinder head 3-4 and the adjusting cylinder body 3-16, and O-ring seals 3-3 are provided on the mating surfaces of the adjusting front cylinder head 3-4 and the housing 2-1; O-ring seals 3-9 and PTFE guide strips 3-10 are arranged side by side between the inner cavities of the adjusting piston 3-8 and the adjusting cylinder body 3-16; the adjusting push rod 3-7 is fixed to the adjusting piston 3-8 by hexagonal thin nut 3-14, and the adjusting push rod 3-7 is movably connected to the center hole of the adjusting front cylinder head 3-4 by an oil-free bushing 3-2, and an O-ring seal 3-1 is also provided between the adjusting push rod 3-7 and the center hole of the adjusting front cylinder head 3-4.

[0040] In this embodiment, adjusting bolt 3-12 engages with and tightens nut 3-13, enabling adjustable fixing of adjusting piston 3-8 on adjusting cylinder head 3-15, flexibly adapting to different load torque requirements while ensuring a secure lock. O-rings 3-11, 3-5, 3-3, 3-1, and 3-9 seal each mating surface, preventing gas leakage; PTFE guide strip 3-10 reduces wear on adjusting piston 3-8 and guides its movement. Hexagonal thin nut 3-14 fixes adjusting push rod 3-7 to adjusting piston 3-8, and oil-free bushing 3-2 ensures flexible movement of the push rod.

[0041] In some embodiments, see Figure 1 The connecting bracket 4-2 fixes the actuator 5 of the angle to be measured by hexagonal head bolts 4-1. The connecting bracket 4-2 and the monitoring station 4-5 are connected by equal-length double-ended studs 4-4 and hexagonal nuts 4-3. The monitoring station 4-5, the tooling bracket 4-12 and the mounting bracket 4-9 are connected by equal-length double-ended studs 4-8 and hexagonal nuts 4-7. The mounting bracket 4-9 is connected to the housing 2-1 by hexagonal head bolts 4-10. The bottom of the tooling bracket 4-12 is provided with multiple foot pads 4-15.

[0042] In this embodiment, hexagonal head bolts 4-1 securely fix the actuator 5 to be tested to the connecting bracket 4-2, preventing shaking deviations during testing. Equal-length double-ended studs 4-4, in conjunction with hexagonal nuts 4-3, achieve a rigid connection between the connecting bracket 4-2 and the monitoring platform 4-5, ensuring assembly accuracy. Equal-length double-ended studs 4-8, in conjunction with hexagonal nuts 4-7, connect the monitoring platform 4-5, tooling bracket 4-12, and mounting bracket 4-9 into a single unit. Hexagonal head bolts 4-10 fix the mounting bracket 4-9 to the housing 2-1, enhancing overall stability. Foot pads 4-15 buffer and dampen shocks, level the equipment, and reduce external interference.

[0043] Next, the working principle of a dynamic load testing method for a pneumatic actuator involved in the embodiments of the present invention will be explained. This method is applied to the aforementioned dynamic load testing equipment for pneumatic actuators, and the method includes: Step S1: Before the test, the operator inputs the test parameters through the parameter display screen 4-13. The test parameters shall include at least the model of the actuator 5 to be tested, the test torque range, and the dynamic load curve information. Step S2: After receiving the preset parameters, the integrated pneumatic control accessory group 4-6 automatically calculates the required air source pressure and spring preload for the test. Then, it drives the electric proportional valve connected to the air source port of the control component 1, as well as the limit bolt 1-2 of the control component 1 and the adjusting bolt 3-12 of the adjustment component 3 to work together. By adjusting the limit bolt 1-2, the preload and compression of the control compression spring 1-8 are changed, and by adjusting the adjusting bolt 3-12, the preload and compression of the adjustment compression spring 3-6 are changed. Finally, the dynamic load torque setting is completed, ensuring that the load parameters are fully matched with the test requirements of the angular stroke actuator 5 under test. Step S3: After the load setting is completed, the air supply action command of the measuring angle stroke actuator 5 is triggered. After the measuring angle stroke actuator 5 is ventilated, it starts to operate. Its output power is transmitted to the monitoring station 4-5 through the connecting short shaft 4-14, and then through the installation short shaft 4-11 to drive the crank arm 2-6 installed in the housing 2-1 in the connecting assembly 2 to rotate. In step S4, when the crank arm 2-6 rotates, the connecting block 2-9, which is hinged to it via the pressure plate 2-7 and the pin 2-8, synchronously drives the control push rod 1-9 of the control component 1 and the adjusting push rod 3-7 of the adjusting component 3 to perform linear reciprocating motion. The control push rod 1-9 drives the control piston 1-17 of the control component 1 to reciprocate within the control cylinder 1-20, and the adjusting push rod 3-7 drives the adjusting piston 3-8 of the adjusting component 3 to reciprocate within the adjusting cylinder 3-16. During the reciprocating motion of the two pistons, the corresponding compression springs are compressed respectively, so that the test equipment forms a stable dynamic load torque. At the same time, the dynamic torque sensor 4-16 in the monitoring component collects the dynamic torque change signal in real time. After the data is processed by the integrated pneumatic control accessory group 4-6, it is output in real time through the parameter display screen 4-13, and the response time and torque overshoot index of the angle stroke actuator 5 under test are recorded synchronously. After step S5, the basic load test is completed, the integrated pneumatic control accessory group 4-6 automatically switches to different levels of torque load through a preset program, or conducts multi-cycle cyclic tests to continuously monitor the stability of the angular stroke actuator 5 under different loads and different number of cycles, comprehensively verifying its long-term operating performance and ensuring the comprehensiveness and reliability of the test results. After all test procedures are completed, the integrated pneumatic control accessory group 4-6 automatically generates and exports a complete test report, comparing and analyzing the measured performance data of the angular stroke actuator 5 under test with the preset design indicators, clearly presenting the product performance compliance status.

[0044] In summary, the tooling components of this technical solution achieve stable assembly and overall support of the test piece, while the connecting components complete the power conversion and transfer. The control and adjustment components are symmetrically linked, enabling wide-range, high-precision automatic control of dynamic load torque. It adapts to different specifications of actuators under test, eliminating the need for frequent tooling changes and significantly improving testing efficiency. The monitoring components capture and visualize dynamic torque changes in real time. Combined with the automated testing process, it integrates load setting, test execution, data acquisition, stability verification, and report export, ensuring reliable test data and a controllable and efficient testing process. Furthermore, the optimized design of various sealing and guiding components ensures stable equipment operation, low wear, and good sealing, extending the equipment's service life and meeting the high standards required for performance verification of diagonal stroke actuators in the industrial field.

[0045] In the embodiments disclosed in this invention, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this invention according to the specific circumstances.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dynamic load testing device for a pneumatic actuator, characterized in that, include: The tooling assembly (4) includes a tooling bracket (4-12), a monitoring platform (4-5) mounted on the top of the tooling bracket (4-12), a connecting bracket (4-2) mounted on the top of the monitoring platform (4-5), and a mounting bracket (4-9) mounted on the top of the tooling bracket (4-12). The connecting component (2), located inside the tooling bracket (4-12), includes a housing (2-1) installed at the bottom of the mounting bracket (4-9), a curved arm (2-6) rotatably disposed in the housing (2-1) in the vertical direction, and a connecting block (2-9) hinged to the curved arm (2-6). The control component (1) and the adjustment component (3) are located inside the tooling bracket (4-12). They are respectively installed on both sides of the connecting component (2). The load torque output ends of both are connected to the connecting block (2-9) for transmission. They cooperate to provide dynamic load torque. The tooling assembly (4) further includes a mounting short shaft (4-11), a connecting short shaft (4-14), and a monitoring component. The first end of the mounting short shaft (4-11) passes through the middle cavity of the crank arm (2-6), and the second end of the mounting short shaft (4-11) passes through the mounting bracket (4-9) and extends into the monitoring platform (4-5). The first end of the connecting short shaft (4-14) is drivenly connected to the output end of the angular stroke actuator (5) to be tested, and the second end of the connecting short shaft (4-14) passes through the connecting bracket (4-2) and extends into the monitoring platform (4-5), and is drivenly connected to the second end of the mounting short shaft (4-11). The monitoring component is set on the monitoring platform (4-5) and is used to collect and provide feedback on the dynamic changes in torque during the test process in real time.

2. The dynamic load testing equipment for pneumatic actuators according to claim 1, characterized in that, The monitoring component includes: A dynamic torque sensor (4-16) is installed at the connection between the second end of the connecting short shaft (4-14) and the second end of the mounting short shaft (4-11) to collect dynamic torque change data in real time during the test. An integrated pneumatic control accessory group (4-6) is installed inside the monitoring station (4-5) to receive test data collected by the dynamic torque sensor (4-16) and feed it back to the parameter display screen (4-13) for real-time display.

3. The dynamic load testing equipment for pneumatic actuators according to claim 1, characterized in that, The control component (1) includes: A control cylinder body (1-20) has a control front cylinder head (1-13) and a control rear cylinder head (1-3) installed on its two sides respectively. The control front cylinder head (1-13) is connected to the housing (2-1). A limiting piston (1-5) is arranged axially within the control cylinder (1-20) and is adjustablely mounted on the control rear cylinder head (1-3). It has a through central vent hole. A control piston (1-17) is arranged axially within the control cylinder (1-20) along the control cylinder (1-20), and a control compression spring (1-8) is installed between it and the limiting piston (1-5). The control push rod (1-9) has its first end sealed and installed in the center hole of the control piston (1-17), and its second end passes through the control front cylinder head (1-13) and extends into the housing (2-1) and is connected to the connecting block (2-9) in a transmission manner. Both the front cylinder head (1-13) and the rear cylinder head (1-3) are provided with air source holes. The air source holes are connected to external compressed air through air pipes. An electric proportional valve is installed on the air pipes. The electric proportional valve is electrically connected to the integrated pneumatic control accessory group (4-6) of the monitoring component so that the integrated pneumatic control accessory group (4-6) can adjust the load torque according to the specifications of the angular stroke actuator (5) to be measured.

4. The dynamic load testing equipment for pneumatic actuators according to claim 1, characterized in that, The adjustment component (3) includes: An adjusting cylinder body (3-16) is provided with an adjusting front cylinder head (3-4) and an adjusting rear cylinder head (3-15) on its two sides respectively. The adjusting front cylinder head (3-4) is connected to the housing (2-1). An adjusting piston (3-8) is axially disposed within the adjusting cylinder (3-16) and is adjustablely mounted on the rear adjusting cylinder head (3-15). An adjusting compression spring (3-6) is installed between the adjusting piston and the front adjusting cylinder head (3-4). The adjusting push rod (3-7) has its first end installed in the center hole of the adjusting piston (3-8), and its second end passes through the adjusting front cylinder head (3-4) and extends into the housing (2-1) and is connected to the connecting block (2-9) in a transmission manner.

5. The dynamic load testing equipment for pneumatic actuators according to claim 1, characterized in that, The bottom of the housing (2-1) is fitted with a cover (2-4). The first end of the mounting short shaft (4-11) is rotatably connected to the center hole of the housing (2-1) and the center hole of the cover (2-4) through an oil-free bushing (2-10) and an oil-free bushing (2-11), respectively. An end cap (2-5) is fitted at the bottom of the center hole of the cover (2-4). The connecting block (2-9) is hinged to the crank arm (2-6) via a pressure plate (2-7) and a pin (2-8); The housing (2-1) and the control front cylinder head (1-13) of the control component (1), and the housing (2-1) and the adjustment front cylinder head (3-4) of the adjustment component (3) are all connected by equal-length double-ended studs (2-2) and hexagonal thin nuts (2-3); An O-ring (2-12) is provided between the mounting short shaft (4-11) and the center hole of the housing (2-1), an O-ring (2-13) is provided between the end cap (2-5) and the center hole of the housing cover (2-4), and an O-ring (2-14) is provided between the bottom mating surface of the housing cover (2-4) and the housing (2-1).

6. The dynamic load testing equipment for pneumatic actuators according to claim 3, characterized in that, The limiting piston (1-5) is adjustablely mounted on the control rear cylinder head (1-3) by means of a limiting bolt (1-2) and a tightening nut (1-1); The mating surfaces of the control cylinder head (1-3) and the control cylinder body (1-20) are provided with O-ring seals (1-4). The mating surfaces of the control front cylinder head (1-13) and the control cylinder body (1-20) are provided with O-ring seals (1-12), and the mating surfaces of the control front cylinder head (1-13) and the housing (2-1) are provided with O-ring seals (1-14). An O-ring (1-6) and a PTFE guide strip (1-7) are arranged side by side between the inner cavity of the limiting piston (1-5) and the control cylinder (1-20). An O-ring (1-15) and a PTFE guide strip (1-16) are arranged side by side between the inner cavity of the control piston (1-17) and the control cylinder (1-20).

7. The dynamic load testing equipment for pneumatic actuators according to claim 3, characterized in that, Two O-rings (1-18) are arranged side by side between the center hole of the control push rod (1-9) and the control piston (1-17). The control push rod (1-9) is fixed to the control piston (1-17) by a retaining ring (1-19). The control push rod (1-9) is movably connected to the center hole of the control front cylinder head (1-13) through an oil-free bushing (1-10), and an O-ring (1-11) is also provided between the control push rod (1-9) and the center hole of the control front cylinder head (1-13).

8. The dynamic load testing equipment for pneumatic actuators according to claim 4, characterized in that, The adjusting piston (3-8) is adjustablely mounted on the adjusting rear cylinder head (3-15) by means of adjusting bolt (3-12) and tightening nut (3-13); The mating surfaces of the adjusted cylinder head (3-15) and the adjusted cylinder body (3-16) are provided with O-ring seals (3-11). The mating surfaces of the front cylinder head (3-4) and the cylinder body (3-16) are provided with O-ring seals (3-5), and the mating surfaces of the front cylinder head (3-4) and the housing (2-1) are provided with O-ring seals (3-3). An O-ring (3-9) and a PTFE guide strip (3-10) are arranged side by side between the inner cavity of the adjusting piston (3-8) and the adjusting cylinder (3-16). The adjusting push rod (3-7) is fixed to the adjusting piston (3-8) by a hexagonal thin nut (3-14). The adjusting push rod (3-7) is movably connected to the center hole of the adjusting front cylinder head (3-4) through an oil-free bushing (3-2). An O-ring (3-1) is also provided between the adjusting push rod (3-7) and the center hole of the adjusting front cylinder head (3-4).

9. The dynamic load testing equipment for pneumatic actuators according to claim 1, characterized in that, The connecting bracket (4-2) fixes the actuator (5) of the angle to be measured by a hexagonal head bolt (4-1). The connecting bracket (4-2) is connected to the monitoring station (4-5) by a double-ended stud (4-4) of equal length and a hexagonal nut (4-3). The monitoring station (4-5), the tooling bracket (4-12) and the mounting bracket (4-9) are connected by a double-ended stud (4-8) of equal length and a hexagonal nut (4-7). The mounting bracket (4-9) is connected to the housing (2-1) by a hexagonal head bolt (4-10). The bottom of the tooling bracket (4-12) is provided with multiple foot pads (4-15).

10. A dynamic load test method for a pneumatic actuator, characterized in that, The method is applied to the dynamic load testing equipment for pneumatic actuators as described in any one of claims 1 to 9, and the method includes: S1. Before the test, the operator inputs the test parameters through the parameter display screen (4-13). The test parameters shall include at least the model of the angular stroke actuator (5) to be tested, the test torque range, and the dynamic load curve information. S2. After receiving the preset parameters, the integrated pneumatic control accessory group (4-6) automatically calculates the required air source pressure and spring preload for the test. Then, it drives the electric proportional valve connected to the air source port of the control component (1), as well as the limit bolt (1-2) of the control component (1) and the adjusting bolt (3-12) of the adjustment component (3) to work together. By adjusting the limit bolt (1-2), the preload and compression of the control compression spring (1-8) are changed, and by adjusting the adjusting bolt (3-12), the preload and compression of the adjustment compression spring (3-6) are changed. Finally, the dynamic load torque is set to ensure that the load parameters are fully matched with the test requirements of the angular stroke actuator (5). S3. After the load setting is completed, the ventilation action command of the actuator (5) of the angle to be measured is triggered. After the actuator (5) of the angle to be measured is ventilated, it starts to move. Its output power is transmitted to the monitoring station (4-5) through the connecting short shaft (4-14), and then through the installation short shaft (4-11) to drive the crank arm (2-6) installed in the box (2-1) in the connecting assembly (2) to rotate. S4. When the crank arm (2-6) rotates, it drives the control push rod (1-9) of the control component (1) and the adjustment push rod (3-7) of the adjustment component (3) to perform linear reciprocating motion through the connecting block (2-9) hinged to the pressure plate (2-7) and the pin (2-8). The control push rod (1-9) drives the control piston (1-17) of the control component (1) to reciprocate in the control cylinder (1-20), and the adjustment push rod (3-7) drives the adjustment piston (3-8) of the adjustment component (3) to reciprocate in the adjustment cylinder (3-16). During the reciprocating motion of the two pistons, the corresponding compression springs are compressed respectively, so that the test equipment forms a stable dynamic load torque. At the same time, the dynamic torque sensor (4-16) in the monitoring component collects the dynamic change signal of torque in real time. After the data is processed by the integrated pneumatic control accessory group (4-6), it is output in real time through the parameter display screen (4-13), and the response time and torque overshoot index of the angle stroke actuator (5) under test are recorded simultaneously. S5. After the basic load test is completed, the integrated pneumatic control accessory group (4-6) automatically switches to different levels of torque load through the preset program, or conducts multi-cycle cyclic tests to continuously monitor the stability of the angle stroke actuator (5) under different loads and different number of cycles, fully verify its long-term operating performance, and ensure the comprehensiveness and reliability of the test results. After all test procedures are completed, the integrated pneumatic control accessory group (4-6) automatically generates and exports a complete test report, compares and analyzes the measured performance data of the angle stroke actuator (5) under test with the preset design indicators, and clearly presents the product performance compliance status.

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