A test device for electric valve actuator based on variable gap electromagnetic braking

Abstract

The invention discloses an electric valve actuator testing device based on variable gap electromagnetic braking, comprising: a controller, an electric valve actuator, a torque transmission and measurement module, a current output adjustment module, an inertia turntable, a reconfigurable variable gap electromagnetic braking module, a precision electromagnetic field regulator, a hydraulic rotational inertia simulation module and a high-precision microvalve hydraulic adjustment module; the electric valve actuator is connected to the inertia turntable through the torque transmission and measurement module, the current output adjustment module is connected to the precision electromagnetic field regulator, the high-precision microvalve hydraulic adjustment module is connected to the hydraulic rotational inertia simulation module, the controller is connected to the electric valve actuator, the torque transmission and measurement module, the current output adjustment module, and the high-precision microvalve hydraulic adjustment module, and the inertia turntable is rotatably arranged on a bracket; the reconfigurable variable gap electromagnetic braking module based on a four-step structure can simulate the valve resistance torque change curve to meet the valve resistance torque dynamic response requirements.

Description

Technical Field

[0001] The invention belongs to the field of electric valve actuator testing equipment, and in particular relates to an electric valve actuator testing device based on variable gap electromagnetic braking. Background Art

[0002] Electric valve actuators are widely used in modern industrial production fields such as environmental protection industry, chemical industry, power industry and powder industry. As the core component for driving and controlling electric valves, electric valve actuators receive electrical signals from the controller to realize the opening, closing and position adjustment of valves, and accurately control the fluid flow in the pipeline. In order to ensure the quality of electric valve actuators, experimental tests must be carried out in accordance with the national standard GB / T28270-2012 "Intelligent Valve Electric Device". The test items mainly include performance tests and reliability tests to ensure that electric valve actuators can operate normally under various working conditions and meet design requirements.

[0003] When opening or closing a valve, the electric valve actuator needs to generate enough torque to overcome the three different sources of valve resistance in the valve: the friction of the valve itself, the fluid pressure in the valve, and the inertia moment generated by the weight and structure of the valve itself. At the same time, at the moment the valve is opened or closed, the fluid pressure will affect the working torque of the valve. For example, the change in fluid flow rate and flow direction when the valve is opened will cause instantaneous pressure fluctuations. This requires that when testing the electric valve actuator, the actuator's driving torque must take into account the fluid resistance. Therefore, the electric valve actuator needs to fully consider the above three sources of resistance during the test process to ensure that the output torque meets the torque curve of the actual working conditions, and ultimately ensure that the valve can operate normally under the actual working conditions. However, the existing technology has deficiencies in testing different types of valve actuators. Due to the different structures and masses of valves of different models, and the different performance parameters such as resistance and moment of inertia, it is difficult for the existing test device to make detailed tests on the output torque, stroke, response time and working life of the valve actuator through a single device.

[0004] The invention patent "Comprehensive Test Device for Electric Actuators of Rotary Valve" (patent number CN110579345B) discloses a comprehensive test device for electric actuators of rotary valves. The device applies different pressures through the alternating operation of the cylinders, so that the fixed friction disc produces varying friction forces on the movable friction disc, thereby changing the torque applied to the actuator and simulating different torques. However, the device mainly relies on the interaction between the cylinder and the friction disc to test the torque output of the actuator. The accuracy will be affected by air pressure fluctuations or unstable friction. When performing high-precision torque tests, the reliability and repeatability of the test results are insufficient.

[0005] The invention patent "A test device for a valve electric actuator" (patent number CN116859173B) discloses a test device for a valve electric actuator, which consists of an electric actuator, a clamp, a collar, a first magnet, a second magnet, a collar and a pressure sensor. The first magnet on the outer side of the clamp rotates synchronously with the output shaft. As the output shaft rotates, the first magnet gradually approaches the second magnet fixed on the inner side of the collar. When the magnetic repulsion between the magnets and the rotational torque of the output shaft reach a balance, the pressure value of the pressure sensor is the torque of the output shaft at the current angle. At the same time, the device can simulate the state of the electric valve actuator at different working angles by changing the relative position between the magnets. The device mainly simulates the torque output of the valve actuator at different static angles, but fails to simulate the changes in working conditions during dynamic operation. Therefore, this method cannot fully reflect the dynamic response and performance of the valve actuator in actual use.

[0006] In summary, the existing electric valve actuator test device still has the following problems in practical application:

[0007] First, the existing electric valve actuator test device simulates the working torque of the electric valve actuator through the friction between the friction disk and the output shaft. However, as the number of tests increases, the surface of the friction disk and the output shaft is easily worn and gradually damaged, which directly causes the torque of the electric valve actuator to change, thus making the test device inaccurate or inconsistent in test accuracy.

[0008] Second: The existing electric valve actuator test device fails to fully consider the impact of fluid pressure on the torque during the opening and closing process of the valve. It can only simulate the working torque of the electric valve actuator under static conditions, and fails to fully reflect the actual change curve of the valve resistance torque caused by the fluid pressure during the opening and closing process of the valve. It is impossible to fully test the dynamic response performance of the valve resistance torque of the electric valve actuator.

[0009] Third: The existing electric valve actuator test device fails to take into account the actual movement range of the valve during the test process, and often tests in a continuous rotation manner, reflecting the valve opening and closing in the range of 0 to 360 degrees, which is inconsistent with the actual working angle range of the valve of 0 to 90 degrees. This test condition cannot truly simulate the actual opening and closing process of the valve. This test method ultimately leads to inaccurate life test results after the reliability test of the electric valve actuator.

[0010] In order to solve the above problems, we propose an electric valve actuator test device based on variable gap electromagnetic braking. We use a reconfigurable variable gap electromagnetic braking module to accurately simulate the change process of the resistance torque of the valve during the opening and closing process. We use a high-precision microvalve hydraulic regulation module integrated with a multi-channel microvalve unit to achieve precise control of the output torque of the hydraulic cylinder, simulate the load conditions and rotational inertia of valves of different models, and provide a new technical solution for the testing of electric valve actuators. Summary of the invention

[0011] The purpose of the present invention is to provide an electric valve actuator testing device based on variable gap electromagnetic braking, which simulates the dynamic change process of the valve torque through a reconfigurable variable gap electromagnetic braking module, reflects the resistance torque change characteristics during the valve opening and closing process, and can redesign the four-step structure according to the working characteristics of valves of different models to ensure that the electromagnetic braking module in the test process can simulate the valve resistance torque change curve under actual working conditions, and use a high-precision microvalve hydraulic adjustment module integrated with a multi-channel microvalve unit to achieve precise control of the hydraulic cylinder output torque, and change the rotational inertia of the inertia turntable to simulate the load characteristics of valves of different models, so as to solve the problems of low test accuracy and poor test effect of the current electric valve actuator testing system.

[0012] In order to solve the above problems, the present invention discloses an electric valve actuator testing device based on variable gap electromagnetic braking, comprising: a controller, an electric valve actuator, a torque transmission and measurement module, a current output adjustment module, an inertia turntable, a reconfigurable variable gap electromagnetic braking module, a precision electromagnetic field regulator, a hydraulic rotational inertia simulation module and a high-precision microvalve hydraulic adjustment module; the electric valve actuator is connected to the inertia turntable through the torque transmission and measurement module, the current output adjustment module is connected to the precision electromagnetic field regulator, the high-precision microvalve hydraulic adjustment module is connected to the hydraulic rotational inertia simulation module, the controller is connected to the electric valve actuator, the torque transmission and measurement module, the current output adjustment module, the high-precision microvalve hydraulic The inertia turntable is rotatably arranged on the bracket; the high-precision microvalve hydraulic adjustment module is connected with a hydraulic pump, an oil tank, and a throttle valve, which together constitute a rotational inertia adjustment hydraulic circuit; the controller sends a control signal to the electric valve actuator to execute the opening or closing action of the valve, receives the feedback signal of the electric valve actuator, and the controller receives the measurement data of the torque transmission and measurement module; the controller sends a control signal to the current output adjustment module to adjust the magnetic field strength of the precise electromagnetic field regulator; the controller sends a control signal to the high-precision microvalve hydraulic adjustment module to adjust the linear thrust of the hydraulic rotational inertia simulation module, and simulates the rotational inertia of valves of different models after converting it into torque.

[0013] As a further improvement of the above technical solution:

[0014] The current output regulation module includes a DAC chip, an operational amplifier, a current sampling resistor, a MOS tube and an ADC chip. The DAC chip converts the digital signal sent by the controller into an analog voltage. The analog voltage is input into the positive input terminal of the operational amplifier as a reference voltage. The current sampling resistor detects the actual working current in the circuit and feeds back the voltage signal to the negative input terminal of the operational amplifier. The operational amplifier compares the reference voltage with the feedback voltage of the current sampling resistor, adjusts the conduction degree of the MOS tube according to the difference between the two, and further controls the output current of the current output regulation module. The ADC chip collects feedback signals, and the controller adjusts the output of the DAC chip in real time according to the feedback signals to form a closed-loop control to ensure that the current is stably output to the precise electromagnetic field regulator within the range of 0 to 2A.

[0015] The torque transmission and measurement module includes a first coupling, a torque detection sensor and a second coupling. The first coupling is connected to the output shaft of the electric valve actuator, the second coupling is connected to the central rotating shaft of the inertia turntable, and the torque detection sensor is located between the first coupling and the second coupling for real-time measurement of the torque value.

[0016] The inertia turntable includes a central rotating shaft, an electromagnetic braking platform and a rotational inertia adjustment platform. One end of the central rotating shaft is connected to the torque transmission and measurement module, and the other end is fixed to the bracket. An electromagnetic braking area is provided on the electromagnetic braking platform. There are fixing holes on both sides of the electromagnetic braking area for fixing a reconfigurable variable gap electromagnetic braking device, which cuts the magnetic induction line in the high-intensity adjustable magnetic field source provided by the precision electromagnetic field regulator and generates an electromagnetic braking torque. A slot is provided on the rotational inertia adjustment platform as a rotational inertia adjustment area. The end of the hydraulic rotational inertia simulation module contacts the rotational inertia adjustment platform through a rolling ball to apply a load to the rotational inertia adjustment platform, thereby adjusting the rotational inertia of the inertia turntable. The reconfigurable variable gap electromagnetic brake module is designed as a four-step structure with a smooth surface transition. The height of the four-step structure increases or decreases step by step. The step height directly affects the gap size and gap change between the reconfigurable variable gap electromagnetic brake module and the precise electromagnetic field regulator, thereby changing the magnetic field strength to achieve a rapid response of the braking torque. At the same time, by designing different four-step structures, the resistance torque change characteristics of different types of valves are met. The electromagnetic field strength calculation formula is:

[0017]

[0018] Among them, L is the integration path, I is the current size, μ 0is the vacuum magnetic permeability constant, D is the distance between the precise electromagnetic field regulator and the reconfigurable variable gap electromagnetic brake module, h is the step height of the reconfigurable variable gap electromagnetic brake module, θ is the angle between the current element and the position vector of the reconfigurable variable gap electromagnetic brake module, and dl is the tiny line element of the source current.

[0019] The reconfigurable variable gap electromagnetic brake module dynamically adjusts the electromagnetic braking torque through a four-step structure. When the height of the step structure is determined, the controller outputs a control signal to the current output adjustment module to change the current of the precise electromagnetic field regulator to achieve precise adjustment of the electromagnetic field. The calculation equation of the electromagnetic braking torque is:

[0020] T b =r 1 σv z ∫ v B 2 dv

[0021] Among them, T b is the braking torque of the reconfigurable variable gap electromagnetic brake module, r 1 is the distance from the reconfigurable variable gap electromagnetic brake module to the central rotation axis, σ is the conductivity of the reconfigurable variable gap electromagnetic brake module, v z is the linear speed of the inertial turntable, B is the electromagnetic field size of the precise electromagnetic field regulator, and v is the volume of the reconfigurable variable gap electromagnetic brake module.

[0022] The four-step structure of the reconfigurable variable gap electromagnetic brake module includes an initial ascending step, a torque peak step, a rapid descending step, and a terminal stable step. The valve opening angle corresponding to the initial ascending step is 0-30°, the valve opening angle corresponding to the torque peak step is 30-70°, and the valve opening angle corresponding to the rapid descending step is 70-85°. The valve state corresponding to this stage is gradually separated from the main fluid, and the torque decreases rapidly. The valve opening angle corresponding to the terminal stable step is 85-90°, and this stage corresponds to the fully open state of the valve, and the torque tends to be stable.

[0023] The high-precision microvalve hydraulic regulation module is integrated by a plurality of microvalve units, the oil outlets of the microvalve units are connected to a first integrated output pipeline and a second integrated pipeline, the first integrated output pipeline and the second integrated pipeline are connected to the top oil chamber and the bottom oil chamber of the hydraulic cylinder in the hydraulic rotational inertia simulation module, the control signal of the controller controls the dynamic combination form and the switch state of the microvalve unit, accurately controls the hydraulic oil supply at both ends of the hydraulic cylinder, and changes the rotational inertia of the inertia turntable by changing the output thrust of the hydraulic rotational inertia simulation module, thereby realizing the load characteristic simulation of different types of valves during actual operation.

[0024] The end contact of the hydraulic moment of inertia simulation module is a rolling ball contact. The rolling ball moves in the moment of inertia adjustment area and applies positive pressure to the inertia turntable to simulate the load conditions of valves of different models. The rolling ball is made of low-friction coefficient material. The surface of the moment of inertia adjustment platform has a specially treated low-friction coating to reduce the friction between the rolling ball and the platform surface. The controller dynamically adjusts the current of the precision electromagnetic field regulator to compensate for the additional braking torque caused by friction. The calculation formula of the current and electromagnetic braking torque of the precision electromagnetic field regulator is:

[0025]

[0026] Among them, T b is the braking torque of the reconfigurable variable gap electromagnetic brake module, r 2 is the distance from the end contact point of the hydraulic moment of inertia simulation module to the central rotation axis, μ is the friction coefficient between the end contact of the hydraulic moment of inertia simulation module and the moment of inertia adjustment platform, m is the mass of the rolling ball, g is the gravitational acceleration, and F is the linear thrust of the hydraulic moment of inertia simulation module.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention uses a reconfigurable variable gap electromagnetic brake device based on a four-step structure to achieve non-contact electromagnetic braking, which has no friction loss and can ensure the long-term consistency of the torque change of the valve in the working state, and also ensure the accuracy of torque control. The gap between the brake device and the strong magnetic field source is adjusted through a smooth four-step structure to fit the resistance torque change curve of the "initial rising stage, torque peak stage, rapid decline stage and terminal stable stage" of the real valve during the opening process. In addition, the four-step structure can be reconstructed according to the characteristics of valves of different models to adapt to the dynamic response requirements of the resistance torque of various models of valves.

[0029] 2. The electric valve actuator test device based on variable gap electromagnetic braking of the present invention realizes precise control of hydraulic flow within microsecond level through multi-way micro-valve units. The micro-valve units are finally integrated into a high-precision micro-valve hydraulic adjustment module, and hydraulic oil is provided to the hydraulic cylinder through an integrated output pipeline. The controller dynamically combines and independently adjusts the multi-way micro-valve units, adjusts the output torque of the hydraulic rotational inertia simulation module, effectively changes the rotational inertia of the inertia turntable, and simulates the load characteristics of valves of different models.

[0030] 3. The electric valve actuator test device based on variable gap electromagnetic brake of the present invention can accurately reproduce the working state of the real valve by testing the valve in the angle range of 0-90°. At the same time, it can also realize the "open-close-open-close" cycle action of different types of valves under different operating conditions, provide a more realistic test environment for verifying the performance of the electric valve actuator, accurately test the response speed and output torque of the electric valve actuator under actual working conditions, and verify the working stability of the electric valve actuator in the cycle action. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the torque transmission and measurement module of the present invention;

[0033] Figure 3 It is a structural schematic diagram of the inertia turntable of the present invention;

[0034] Figure 4 It is a structural schematic diagram of the reconfigurable variable gap electromagnetic brake device of the present invention;

[0035] Figure 5 It is a structural schematic diagram of the high-precision microvalve hydraulic regulation module of the present invention.

[0036] Figure numerals: 1. controller; 10. high-precision microvalve hydraulic adjustment module; 101. microvalve unit; 102. first integrated output pipeline; 103. second integrated pipeline; 11. hydraulic pump; 12. oil tank; 13. throttle valve; 2. electric valve actuator; 3. torque transmission and measurement module; 31. first coupling; 32. torque detection sensor; 33. second coupling; 4. current output adjustment module; 5. bracket; 6. inertial turntable; 61. central rotating axis; 62. electromagnetic braking platform; 63. electromagnetic braking area; 64. moment of inertia adjustment platform; 65. moment of inertia adjustment area; 7. reconfigurable variable gap electromagnetic braking module; 71. initial rising step; 72. torque peak step; 73. rapid descent step; 74. terminal stable step; 8. precise electromagnetic field regulator; 9. hydraulic moment of inertia simulation module. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1-5 As shown, an electric valve actuator test device based on variable gap electromagnetic braking includes: a controller 1, an electric valve actuator 2, a torque transmission and measurement module 3, a current output adjustment module 4, a bracket 5, an inertia turntable 6, a reconfigurable variable gap electromagnetic braking module 7, a precise electromagnetic field regulator 8, a hydraulic rotational inertia simulation module 9, a high-precision microvalve hydraulic adjustment module 10, a hydraulic pump 11, a fuel tank 12, and a throttle valve 13.

[0042] The controller 1 is respectively connected to the electric valve actuator 2, the torque transmission and measurement module 3, the current output regulation module 4, and the high-precision microvalve hydraulic regulation module 10. The controller 1 sends a control signal to the electric valve actuator 2 to execute the opening or closing action of the valve, and receives the feedback signal of the electric valve actuator 2; the controller 1 receives the measurement data of the torque transmission and measurement module 3; the controller 1 sends a control signal to the current output regulation module 4 to adjust the magnetic field strength of the precise electromagnetic field regulator 8; the controller 1 sends a control signal to the high-precision microvalve hydraulic regulation module 10 to adjust the linear thrust of the hydraulic rotational inertia simulation module 9, and simulates the rotational inertia of valves of different models after converting it into torque.

[0043] The current output regulation module 4 includes a DAC chip, an operational amplifier, a current sampling resistor, a MOS tube and an ADC chip. The DAC chip converts the digital signal sent by the controller 1 into an analog voltage, and the analog voltage is input into the positive input terminal of the operational amplifier as a reference voltage. The current sampling resistor detects the actual working current in the circuit and feeds back the voltage signal to the negative input terminal of the operational amplifier. The operational amplifier compares the reference voltage with the feedback voltage of the current sampling resistor, and adjusts the conduction degree of the MOS tube according to the difference between the two, thereby controlling the output current of the current output regulation module 4. The ADC chip collects the feedback signal, and the controller 1 adjusts the output of the DAC chip in real time according to the feedback signal to form a closed-loop control to ensure that the current is stably output to the precise electromagnetic field regulator 8 within the range of 0-2A.

[0044] The electric valve actuator 2 is a partial rotary electric actuator that can control a rotary valve to achieve a rotation operation within an angle range of 0 to 90 degrees, such as a plug valve, a butterfly valve, a ball valve, etc. The electric valve actuator 2 transmits the output rotation torque to the inertia turntable 6 through the torque transmission and measurement module 3 .

[0045] The torque transmission and measurement module 3 includes a first coupling 31, a torque detection sensor 32 and a second coupling 33. The first coupling 31 is connected to the output shaft of the electric valve actuator 2, the second coupling 33 is connected to the input shaft of the inertia rotating disk 6, and the torque detection sensor 32 is located between the first coupling 31 and the second coupling 33. The torque detection sensor 32 is a dynamic torque detection sensor, which transmits the real-time torque value of the electric valve actuator 2 in the static state and the rotating state to the controller 1.

[0046] The output torque of the electric valve actuator 2 needs to overcome the torque generated by the three resistance sources of the valve: the braking torque used to overcome the friction of the valve itself, the fluid resistance torque used to overcome the fluid pressure, and the inertia moment used to overcome the valve rotational inertia. The output torque calculation formula of the electric valve actuator 2 is:

[0047] T=T b +T r +T i

[0048] Where, T is the total torque output by the electric valve actuator 2, T b is the braking torque, T r is the fluid resistance moment, T i is the moment of inertia.

[0049] The bracket 5 is used to support and fix the inertia turntable 6, the precise electromagnetic field regulator 8 and the hydraulic moment of inertia simulation module 9. The bottom of the bracket 5 fixes the central rotating shaft 61 of the inertia turntable 6 through the bearing seat, and the central rotating shaft 61 is ensured to rotate freely through the bearing. The hydraulic moment of inertia simulation module 9 is fixed by the flange plate on the upper part, and the precise electromagnetic field regulator 8 is fixedly installed on the side to provide a high-intensity stable magnetic field source for the reconfigurable variable gap electromagnetic brake module 7. The fixed connection method is bolted fixed connection.

[0050] The inertia turntable 6 is a rotating device, including a central rotating shaft 61, an electromagnetic braking platform 62 and a moment of inertia adjustment platform 64. One end of the central rotating shaft 61 is connected to the torque transmission and measurement module 3, and the other end is fixed to the bracket 5 through a bearing; an electromagnetic braking area 63 is provided on the electromagnetic braking platform 62, and there are fixing holes on both sides of the electromagnetic braking area 63, which are used to fix the reconfigurable variable gap electromagnetic braking module 7, which cuts the magnetic induction line movement and generates electromagnetic braking torque in the high-intensity stable magnetic field source provided by the precise electromagnetic field regulator 8. An arc-shaped groove is provided on the moment of inertia adjustment platform 64 as the moment of inertia adjustment area 65, which is used to place and position the rolling ball at the end of the hydraulic moment of inertia simulation module 9. The hydraulic moment of inertia simulation module loads different additional loads in the moment of inertia adjustment area 65 to adjust the moment of inertia of the inertia turntable 6;

[0051] The reconfigurable variable gap electromagnetic brake module 7 is designed as a four-step structure with a smooth surface transition. The height of the four-step structure increases or decreases step by step. The step height directly affects the gap size and gap change between the reconfigurable variable gap electromagnetic brake module 7 and the precise electromagnetic field regulator 8, thereby changing the magnetic field strength to achieve a rapid response of the braking torque. At the same time, by designing different four-step structures, the resistance torque change characteristics of different types of valves can be met. The electromagnetic field strength calculation formula is:

[0052]

[0053] Where L is the integral path, I is the current, μ 0 is the vacuum magnetic permeability constant, D is the distance between the precise electromagnetic field regulator 8 and the reconfigurable variable gap electromagnetic brake module 7, h is the step height of the reconfigurable variable gap electromagnetic brake module 7, θ is the angle between the current element and the position vector of the reconfigurable variable gap electromagnetic brake module 7, and dl is the tiny line element of the source current.

[0054] The reconfigurable variable gap electromagnetic brake module 7 simulates the four fluid resistance torque change stages of the real valve during the opening process through a four-step structure, and dynamically adjusts the electromagnetic braking torque. When the height of the step structure is determined, the controller 1 outputs a control signal to the current output adjustment module 4 to adjust the current of the precise electromagnetic field regulator 8 to achieve precise adjustment of the electromagnetic field. The calculation equation of the electromagnetic braking torque is:

[0055] T b =r 1 σv z ∫ v B 2 dv

[0056] Among them, T b is the braking torque of the reconfigurable variable gap electromagnetic brake module 7, r 1 is the distance from the reconfigurable variable gap electromagnetic brake module 7 to the central rotation axis 61, σ is the conductivity of the reconfigurable variable gap electromagnetic brake module 7, v z is the linear speed of the inertial turntable 6 , B is the electromagnetic field size of the precise electromagnetic field regulator 8 , and v is the volume of the reconfigurable variable gap electromagnetic brake module 7 .

[0057] The four-step structure of the reconfigurable variable gap electromagnetic brake module 7 corresponds to the four fluid resistance torque change stages of the real valve during the opening process, including the initial rising step 71, the torque peak step 72, the rapid descending step 73 and the terminal stable step 74. The valve opening angle corresponding to the initial rising step 71 is 0-30°, corresponding to the initial opening state of the valve. At this time, the fluid begins to flow through the valve, generating resistance and hydrodynamic effects. The valve opening angle corresponding to the torque peak step 72 is 30-70°. At this stage, the hydrodynamic torque generated by the fluid flow resistance rises rapidly and reaches a peak value. The valve opening angle corresponding to the rapid descending step 73 is 70-85°. At this stage, the corresponding valve state is gradually separated from the main fluid effect, and the torque decreases rapidly. The valve opening angle corresponding to the terminal stable step 74 is 85-90°. At this stage, the valve is fully opened and the torque tends to be stable.

[0058] The hydraulic moment of inertia simulation module 9 is controlled by a high-precision microvalve hydraulic regulation module 10, and forms a moment of inertia regulation hydraulic circuit with a hydraulic pump 11, an oil tank 12, and a throttle valve 13. The high-precision microvalve hydraulic regulation module 10 is integrated with a large number of microvalve units 101. The oil outlets of the microvalve units 101 are connected to the first integrated output pipeline 102 and the second integrated pipeline 103. The first integrated output pipeline 102 and the second integrated pipeline 103 connect the top oil chamber and the bottom oil chamber of the hydraulic cylinder in the hydraulic moment of inertia simulation module 9. The control signal of the controller 1 controls the dynamic combination form and switch state of the microvalve unit 101, accurately controls the hydraulic oil supply at both ends of the hydraulic cylinder, and changes the moment of inertia of the inertia turntable 6 by changing the size and speed of the thrust output by the hydraulic moment of inertia simulation module 9, thereby realizing the load characteristic simulation of different types of valves during actual operation.

[0059] The end contact of the hydraulic moment of inertia simulation module 9 is a rolling ball contact. The rolling ball moves in the moment of inertia adjustment area 65 and applies positive pressure to the inertia turntable 6 to simulate the load conditions of different types of valves. The rolling ball is made of low friction coefficient material. The surface of the moment of inertia adjustment platform 64 has a specially treated low friction coating to reduce the friction between the rolling ball and the platform surface. The controller dynamically adjusts the current size of the precision electromagnetic field regulator to compensate for the additional braking torque caused by friction. The relationship between the current of the precision electromagnetic field regulator 8 and the electromagnetic braking torque is:

[0060]

[0061] Among them, T b is the braking torque of the reconfigurable variable gap electromagnetic brake module 7, r 2 is the distance from the end contact point of the hydraulic rotation inertia simulation module 9 to the central rotation axis 61, μ is the friction coefficient between the end contact of the hydraulic rotation inertia simulation module 9 and the rotation inertia adjustment platform 64, m is the mass of the rolling ball, g is the gravitational acceleration, and F is the linear thrust of the hydraulic rotation inertia simulation module 9.

[0062] The hydraulic moment of inertia simulation module 9 and the reconfigurable variable gap electromagnetic brake module 7 work in coordination with each other under the control of the controller 1 to simulate the load characteristics of valves with different signals and the resistance torque change process in actual work. The controller 1 adjusts the moment of inertia of the inertia turntable 6 through the hydraulic moment of inertia simulation module 9 according to the load characteristics of valves of different models. The reconfigurable variable gap electromagnetic brake module 7 simulates the resistance torque change curve in the actual working process of the valve through a four-step structure. The controller 1 adjusts the current of the current output adjustment module 4 to change the electromagnetic field of the precise electromagnetic field regulator 8, adjusts the braking torque of the inertia turntable 6, and compensates for the friction between the hydraulic moment of inertia simulation module 9 and the moment of inertia adjustment platform 64.

[0063] The above is only an embodiment of the present invention, and the common sense such as the known specific structure and characteristics in the scheme is not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A test device for electric valve actuator based on variable gap electromagnetic braking, characterized in that: include: A controller (1), an electric valve actuator (2), a torque transmission and measurement module (3), a current output regulation module (4), an inertia turntable (6), a reconfigurable variable gap electromagnetic brake module (7), a precision electromagnetic field regulator (8), a hydraulic rotational inertia simulation module (9) and a high-precision microvalve hydraulic regulation module (10); the electric valve actuator (2) is connected to the inertia turntable (6) via the torque transmission and measurement module (3), the current output regulation module (4) is connected to the precision electromagnetic field regulator (8), the high-precision microvalve hydraulic regulation module (10) is connected to the hydraulic rotational inertia simulation module (9), and the inertia turntable (6) is rotatably arranged on a bracket (5); the high-precision microvalve hydraulic regulation module (10) is connected to a hydraulic pump (11), an oil tank (12) and a throttle valve (13), and together constitutes a rotational inertia regulation module (11). Hydraulic circuit; the controller (1) is connected to the electric valve actuator (2), the torque transmission and measurement module (3), the current output regulation module (4), and the high-precision microvalve hydraulic regulation module (10); the controller (1) sends a control signal to the electric valve actuator (2) to control the opening or closing of the valve under test, receives a feedback signal from the electric valve actuator (2), and receives measurement data from the torque transmission and measurement module (3); the controller (1) sends a current control signal to the current output regulation module (4) to adjust the magnetic field strength of the precision electromagnetic field regulator (8); the controller (1) sends a control signal to the high-precision microvalve hydraulic regulation module (10) to adjust the linear thrust of the hydraulic rotation inertia simulation module (9), and simulates the rotation inertia of different types of valves under test after converting it into torque; The reconfigurable variable gap electromagnetic brake module (7) is designed as a four-step structure with a smooth surface transition. The height of the four-step structure increases or decreases step by step. The step height directly affects the gap size and gap change between the reconfigurable variable gap electromagnetic brake module (7) and the precise electromagnetic field regulator (8), thereby quickly changing the magnetic field strength to achieve a fast response of the braking torque. At the same time, by designing different four-step structures, the resistance torque change characteristics of different types of valves are met. The electromagnetic field strength calculation formula is: Wherein, L is the integral path, I is the current magnitude, μ0 is the vacuum permeability constant, D is the distance between the precise electromagnetic field regulator (8) and the reconfigurable variable gap electromagnetic brake module (7), h is the step height of the reconfigurable variable gap electromagnetic brake module (7), θ is the angle between the current element and the position vector of the reconfigurable variable gap electromagnetic brake module (7), and dl is the tiny line element of the source current; The reconfigurable variable gap electromagnetic brake module (7) simulates the four fluid resistance torque change stages of a real valve during the opening process through a four-step structure, and dynamically adjusts the electromagnetic braking torque. When the height of the step structure is determined, the controller (1) outputs a control signal to the current output adjustment module (4), changes the current of the precise electromagnetic field regulator (8), and realizes precise adjustment of the electromagnetic field. The calculation equation of the electromagnetic braking torque is: T b =r1σv z ∫ v B 2 dv Among them, T b is the braking torque of the reconfigurable variable gap electromagnetic brake module (7), r1 is the distance from the reconfigurable variable gap electromagnetic brake module (7) to the central rotation axis (61), σ is the conductivity of the reconfigurable variable gap electromagnetic brake module (7), and v z is the linear speed of the inertial turntable (6), B is the electromagnetic field intensity of the precise electromagnetic field regulator (8), and v is the volume of the reconfigurable variable gap electromagnetic brake module (7).

2. The electric valve actuator testing device based on variable gap electromagnetic braking according to claim 1 is characterized in that: The current output regulating module (4) comprises a DAC chip, an operational amplifier, a current sampling resistor, a MOS tube and an ADC chip. The DAC chip converts a digital signal sent by the controller (1) into an analog voltage. The analog voltage is input to the positive input terminal of the operational amplifier as a reference voltage. The current sampling resistor detects the actual working current in the circuit and feeds back a voltage signal to the negative input terminal of the operational amplifier. The operational amplifier compares the reference voltage with the feedback voltage of the current sampling resistor and adjusts the conduction degree of the MOS tube according to the difference between the reference voltage and the feedback voltage of the current sampling resistor, thereby controlling the magnitude of the output current of the current output regulating module (4). The ADC chip collects the feedback signal. The controller (1) adjusts the output of the DAC chip in real time according to the feedback signal to form a closed-loop control, thereby ensuring that the current is stably output to the precise electromagnetic field regulator (8) within the range of 0-2A.

3. The electric valve actuator testing device based on variable gap electromagnetic braking according to claim 1 or 2, characterized in that: The torque transmission and measurement module (3) comprises a first coupling (31), a torque detection sensor (32) and a second coupling (33), wherein the first coupling (31) is connected to the output shaft of the electric valve actuator (2), the second coupling (33) is connected to the central rotating shaft (61) of the inertial rotating disk (6), and the torque detection sensor (32) is located between the first coupling (31) and the second coupling (33) and is used for real-time measurement of the torque value.

4. The electric valve actuator testing device based on variable gap electromagnetic braking according to claim 3 is characterized in that: The inertia turntable (6) comprises a central rotating shaft (61), an electromagnetic braking platform (62) and a rotational inertia adjustment platform (64); one end of the central rotating shaft (61) is connected to the torque transmission and measurement module (3), and the other end is fixed to the bracket (5); an electromagnetic braking area (63) is provided on the electromagnetic braking platform (62); two sides of the electromagnetic braking area (63) are provided with fixing holes for fixing a reconfigurable variable gap electromagnetic braking module (7) to perform a magnetic induction line cutting motion in a high-intensity adjustable magnetic field source provided by the precision electromagnetic field regulator (8) and generate an electromagnetic braking torque; a slot is provided on the rotational inertia adjustment platform (64) as a rotational inertia adjustment area (65); the end of the hydraulic rotational inertia simulation module (9) is contacted by a rolling ball to apply a load to the rotational inertia adjustment platform (64), thereby adjusting the rotational inertia of the inertia turntable (6).

5. The electric valve actuator testing device based on variable gap electromagnetic braking according to claim 4 is characterized in that: The four-step structure of the reconfigurable variable gap electromagnetic brake module (7) comprises an initial rising step (71), a torque peak step (72), a rapid descending step (73) and a terminal stabilization step (74); the valve opening angle corresponding to the initial rising step (71) is 0 to 30°, the valve opening angle corresponding to the torque peak step (72) is 30 to 70°, the valve opening angle corresponding to the rapid descending step (73) is 70 to 85°, and the valve opening angle corresponding to the terminal stabilization step (74) is 85 to 90°.

6. The electric valve actuator testing device based on variable gap electromagnetic braking according to claim 5 is characterized in that: The high-precision microvalve hydraulic adjustment module (10) is integrated with a plurality of microvalve units (101); the oil outlets of the microvalve units (101) are connected to a first integrated output pipeline (102) and a second integrated pipeline (103); the first integrated output pipeline (102) and the second integrated pipeline (103) are connected to the top oil chamber and the bottom oil chamber of the hydraulic cylinder in the hydraulic rotation inertia simulation module (9); the control signal of the controller (1) controls the dynamic combination form and the switch state of the microvalve unit (101), accurately controls the hydraulic oil supply at both ends of the hydraulic cylinder, and changes the rotation inertia of the inertia turntable (6) by changing the magnitude of the thrust output by the hydraulic rotation inertia simulation module (9), thereby achieving load characteristic simulation of different types of valves during actual operation.

7. The electric valve actuator testing device based on variable gap electromagnetic braking according to claim 6 is characterized in that: The controller (1) compensates for the additional braking torque caused by friction by dynamically adjusting the current of the precise electromagnetic field regulator (8). The relationship between the current of the precise electromagnetic field regulator (8) and the electromagnetic braking torque is: Among them, T b is the braking torque of the reconfigurable variable gap electromagnetic brake module (7), r2 is the distance from the end contact point of the hydraulic rotational inertia simulation module (9) to the central rotation axis (61), μ is the friction coefficient between the end contact of the hydraulic rotational inertia simulation module (9) and the rotational inertia adjustment platform (64), m is the mass of the rolling ball, g is the gravitational acceleration, and F is the linear thrust of the hydraulic rotational inertia simulation module (9).

8. The electric valve actuator testing device based on variable gap electromagnetic braking according to claim 7 is characterized in that: The hydraulic moment of inertia simulation module (9) and the reconfigurable variable gap electromagnetic brake module (7) work in coordination with each other under the control of the controller (1) to simulate the load characteristics of valves with different signals and the resistance torque change process in actual operation. The controller (1) adjusts the moment of inertia of the inertia turntable (6) through the hydraulic moment of inertia simulation module (9) according to the load characteristics of valves of different models. The reconfigurable variable gap electromagnetic brake module (7) simulates the resistance torque change curve of the valve in the actual operation process through the four-step structure. The controller (1) adjusts the current of the current output adjustment module (4) to change the electromagnetic field of the precise electromagnetic field regulator (8), adjusts the braking torque of the inertia turntable (6), and compensates for the friction between the hydraulic moment of inertia simulation module (9) and the moment of inertia adjustment platform (64).

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