CN119124610A - A test device for electric valve actuator based on variable gap electromagnetic braking - Google Patents
A test device for electric valve actuator based on variable gap electromagnetic braking Download PDFInfo
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Abstract
本发明公开了一种基于变间隙电磁制动的电动阀门执行器测试装置，包括：控制器、电动阀门执行器、扭矩传递与测量模块、电流输出调节模块、惯性转盘、可重构变间隙电磁制动模块、精准电磁场调节器、液压转动惯量模拟模块和高精度微阀液压调节模块；电动阀门执行器通过扭矩传递与测量模块与惯性转盘相连，电流输出调节模块和精准电磁场调节器相连，所述高精度微阀液压调节模块和液压转动惯量模拟模块相连，所述控制器与电动阀门执行器、扭矩传递与测量模块、电流输出调节模块、高精度微阀液压调节模块相连，惯性转盘转动设置于支架上；基于四阶梯结构的可重构变间隙电磁制动模块可模拟阀门阻力扭矩变化曲线，适应阀门阻力扭矩动态响应需求。
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
The invention belongs to the field of electric valve actuator testing equipment, and particularly relates to an electric valve actuator testing device based on variable-clearance electromagnetic braking.
Background
The electric valve actuator is widely applied to the modern industrial production fields such as environmental protection industry, chemical industry, electric power industry, powder industry and the like. As a core device for driving and controlling the electric valve, the electric valve actuator receives an electric signal from the controller, so that the opening, closing and position adjustment of the valve are realized, and the fluid flow in the pipeline is accurately controlled. In order to ensure the quality of the electric valve actuator, experimental tests are required according to the national standard GB/T28270-2012 Intelligent valve electric device, and test items mainly comprise performance tests, reliability tests and the like so as to ensure that the electric valve actuator can normally operate under various working conditions and meet design requirements.
The electric valve actuator needs to generate enough torque to overcome three different valve resistance sources existing in the valve when the valve is opened or closed, namely the friction force of the valve, the fluid pressure in the valve and the moment of inertia generated by the weight and the structure of the valve. Meanwhile, at the moment of opening or closing the valve, the fluid pressure may affect the working torque of the valve, for example, the change of the fluid flow rate and the fluid direction when opening the valve may cause the instantaneous fluctuation of the pressure, which requires that the driving torque of the actuator must consider the fluid resistance when testing the electric valve actuator. Therefore, the three resistance sources are required to be fully considered in the testing process of the electric valve actuator so as to ensure that the output torque accords with the torque curve of the actual working condition, and finally, the valve can normally operate under the actual working condition. However, the prior art suffers from deficiencies in testing different types of valve actuators. Because the structure and the quality of different model valves are different, performance parameters such as resistance and moment of inertia are also different, and the output torque, stroke, response time and working life of the valve actuator are difficult to carry out detailed test on test indexes such as through single equipment by the existing test device.
The invention patent (patent number CN 110579345B) discloses a rotary valve electric actuator comprehensive test device, which applies different pressures through alternate operation of a cylinder to enable a fixed friction disk to generate variable friction force on a movable friction disk, thereby changing torque applied to an 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 precision can be influenced by air pressure fluctuation or unstable friction force, and the reliability and repeatability of the test result are insufficient when high-precision torque test is performed.
The invention patent (patent number CN 116859173B) discloses a testing device of an electric valve actuator, which consists of the electric actuator, a clamp, a sleeve ring, a first magnet, a second magnet, the sleeve ring and a pressure sensor. The first magnet of clamp lateral surface and output shaft synchronous revolution, along with the rotation of output shaft, first magnet is close to the inboard second magnet of fixing at the lantern ring gradually, and when magnetic repulsion between magnet and output shaft's rotation torsion reached equilibrium, pressure sensor's pressure value is the torsion of output shaft under the current angle promptly. Meanwhile, the device can simulate the states of the electric valve actuator under different working angles by changing the relative positions of the magnets. The device mainly simulates the torque output of the valve actuator at different static angles, but fails to simulate the working condition change in the dynamic operation process. Therefore, the method cannot comprehensively reflect the dynamic response and performance of the valve actuator in actual use.
In summary, the conventional electric valve actuator testing device has the following problems in practical application:
The first step is that the existing electric valve actuator testing device simulates the working torque of the electric valve actuator through the friction force between the friction disc and the output shaft. However, with the increasing of the test times, the surfaces of the friction disc and the output shaft are easily worn and gradually damaged, and the torque of the electric valve actuator is directly changed, so that the test device has inaccurate or inconsistent test precision.
Secondly, the conventional electric valve actuator testing device cannot fully consider the influence of fluid pressure on the torque in the opening and closing processes of the valve, can only simulate the working torque of the electric valve actuator under the static working condition, cannot fully embody the actual change curve of the valve resistance torque caused by the fluid pressure in the opening and closing processes of the valve, and cannot fully test the dynamic response performance of the valve resistance torque of the electric valve actuator.
Third, the existing electric valve actuator testing device fails to consider the actual movement range of the valve in the testing process, and the valve is often tested in a continuous rotation mode, wherein the valve is opened and closed in a 0-360-degree interval, the valve is inconsistent with the actual working angle range of the valve by 0-90 degrees, and the testing condition cannot truly simulate the actual opening and closing process of the valve. In this manner of testing the test piece, finally, the service life detection result of the electric valve actuator after the reliability test is inaccurate.
In order to solve the problems, the electric valve actuator testing device based on the variable-clearance electromagnetic brake is provided, a resistance torque change process of a valve in the opening and closing processes is accurately simulated by using a reconfigurable variable-clearance electromagnetic brake module, accurate control of the output torque of a hydraulic cylinder is realized by using a high-precision micro valve hydraulic adjusting module integrated by a multi-path micro valve unit, the load conditions and the moment of inertia of valves of different types are simulated, and a brand new technical solution is provided for testing the electric valve actuator.
Disclosure of Invention
The invention aims to provide an electric valve actuator testing device based on variable-clearance electromagnetic braking, which simulates the torque dynamic change process of a valve through a reconfigurable variable-clearance electromagnetic braking module, reflects the resistance torque change characteristic in the opening and closing processes of the valve, can redesign a four-step structure according to the working characteristic of different types of valves, ensures that the electromagnetic braking module in the testing process can simulate the valve resistance torque change curve under the actual working condition, realizes the accurate control of the output torque of a hydraulic cylinder by using a high-precision micro valve hydraulic adjusting module integrated by a multi-path micro valve unit, and changes the moment of inertia of an inertia turntable to simulate the load characteristic of different types of valves so as to solve the problems of low testing precision and poor testing effect of the current electric valve actuator testing system.
The invention discloses an electric valve actuator testing device based on variable gap electromagnetic braking, which comprises a controller, an electric valve actuator, a torque transmission and measurement module, a current output adjusting module, an inertia turntable, a reconfigurable variable gap electromagnetic braking module, an accurate electromagnetic field regulator, a hydraulic moment of inertia simulation module and a high-precision micro valve hydraulic adjusting module, wherein the electric valve actuator is connected with the inertia turntable through the torque transmission and measurement module, the current output adjusting module is connected with the accurate electromagnetic field regulator, the high-precision micro valve hydraulic adjusting module is connected with a hydraulic moment of inertia simulation module, the controller is connected with the electric valve actuator, the torque transmission and measurement module, the current output adjusting module and the high-precision micro valve hydraulic adjusting module, the inertia turntable is rotatably arranged on a bracket, the high-precision micro valve hydraulic adjusting module is connected with a hydraulic pump, an oil tank and a throttle valve to jointly form a moment of inertia adjusting hydraulic loop, the controller sends control signals to the electric valve actuator to execute opening or closing actions of the valve to receive feedback signals of the electric valve actuator, the controller sends the control signals to the controller to receive the electromagnetic moment of inertia simulation module, and the controller sends the electromagnetic field signals to the high-precision electromagnetic field regulator to the electromagnetic field regulator to control the high-precision electromagnetic field regulator to adjust the hydraulic moment of inertia simulation module.
As a further improvement of the above technical scheme:
The current output adjusting module comprises a DAC chip, an operational amplifier, a current sampling resistor, an MOS tube and an ADC chip, wherein the DAC chip converts a digital signal sent by a controller into an analog voltage, the analog voltage is used as a reference voltage to be input to a positive input end of the operational amplifier, an actual working current in a current sampling resistor detecting circuit is fed back to a negative input end of the operational amplifier, the operational amplifier compares the reference voltage with a feedback voltage of the current sampling resistor, the conduction degree of the MOS tube is adjusted according to a difference value between the reference voltage and the feedback voltage, and then the current output adjusting module outputs current, the ADC chip acquires a feedback signal, and the controller adjusts the output of the DAC chip in real time according to the feedback signal to form closed-loop control, so that the current is ensured to be stably output to the accurate electromagnetic field regulator within a range of 0-2A.
The torque transmission and measurement module comprises a first coupler, a torque detection sensor and a second coupler, wherein the first coupler is connected with an output shaft of the electric valve actuator, the second coupler is connected with a central rotating shaft of the inertia turntable, and the torque detection sensor is located between the first coupler and the second coupler and is used for measuring a torque value in real time.
The inertia turntable comprises a center rotating shaft, an electromagnetic braking platform and a moment of inertia adjusting platform, one end of the center rotating shaft is connected with the torque transmission and measurement module, the other end of the center rotating shaft is fixed on the support, an electromagnetic braking area is arranged on the electromagnetic braking platform, fixing holes are formed in two sides of the electromagnetic braking area and used for fixedly mounting a reconfigurable gap-changing electromagnetic braking device, cutting magnetic induction line motion is performed in a high-strength adjustable magnetic field source provided by the accurate electromagnetic field adjuster, an electromagnetic braking moment is generated, a slot is formed in the moment of inertia adjusting platform and is used as a moment of inertia adjusting area, and the tail end of the hydraulic moment of inertia simulation module is contacted through a rolling ball, loads are applied to the moment of inertia adjusting platform, so that moment of inertia of the inertia turntable is adjusted. The reconfigurable gap-variable electromagnetic braking module is designed into a four-step structure with smooth transition surface, the height of the four-step structure is gradually increased or decreased, the step height directly influences the gap size and gap change of the reconfigurable gap-variable electromagnetic braking module and the accurate electromagnetic field regulator, so that the magnetic field strength is changed, the rapid response of braking moment is achieved, meanwhile, the resistance torque change characteristics of different types of valves are met by designing different four-step structures, and the electromagnetic field strength calculation formula is as follows:
Wherein L is an integral path, I is current magnitude, mu 0 is vacuum permeability constant, D is distance between the accurate electromagnetic field regulator and the reconfigurable variable-gap electromagnetic braking module, h is step height of the reconfigurable variable-gap electromagnetic braking module, θ is included angle between current element and position vector of the reconfigurable variable-gap electromagnetic braking module, and dl is micro line element of source current.
The reconfigurable gap-changing electromagnetic braking module dynamically adjusts electromagnetic braking torque through a four-step structure, under the condition that the height of the step structure is determined, the controller outputs a control signal to the current output adjusting module, the current of the accurate electromagnetic field adjuster is changed to realize accurate adjustment of the electromagnetic field, and the calculation equation of the electromagnetic braking torque is as follows:
Tb＝r1σvz∫vB2dv
Wherein T b is a braking torque of the reconfigurable variable-gap electromagnetic braking module, r 1 is a distance from the reconfigurable variable-gap electromagnetic braking module to the central rotating shaft, σ is an electrical conductivity of the reconfigurable variable-gap electromagnetic braking module, v z is a linear speed of the inertial turntable, B is an electromagnetic field of the accurate electromagnetic field regulator, and v is a volume of the reconfigurable variable-gap electromagnetic braking module.
The four-step structure of the reconfigurable gap-changing electromagnetic braking module comprises an initial ascending step, a torque peak value step, a rapid descending step and a tail end stable step, wherein the valve opening angle corresponding to the initial ascending step is 0-30 degrees, the valve opening angle corresponding to the torque peak value step is 30-70 degrees, the valve opening angle corresponding to the rapid descending step is 70-85 degrees, the valve state corresponding to the stage is gradually separated from the main fluid effect, and the torque is rapidly reduced. The valve opening angle corresponding to the stable ladder at the tail end is 85-90 degrees, the torque tends to be stable corresponding to the complete opening state of the valve at the stage.
The high-precision micro valve hydraulic pressure regulating module is integrated by a plurality of micro valve units, oil outlets of the micro valve 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 with a top oil cavity and a bottom oil cavity of a hydraulic cylinder in the hydraulic moment of inertia simulating module, a control signal of the controller controls a dynamic combination form and a switching state of the micro valve units, hydraulic oil supply quantity at two ends of the hydraulic cylinder is accurately controlled, the moment of inertia of the inertia turntable is changed by changing the output thrust of the hydraulic moment of inertia simulating module, and load characteristic simulation of valves of different types in the actual operation process is realized.
The hydraulic moment of inertia simulation module's end contact is the spin contact, and the spin is in moment of inertia adjusts the regional motion and to inertia carousel applys positive pressure, simulate the load condition of different model valves, the spin selects low coefficient of friction material to make, the surface of moment of inertia adjusts the platform has the low friction coating through special processing, reduces the frictional force between spin and the platform surface, the controller is through dynamic adjustment accurate electromagnetic field regulator's electric current size, compensates the extra braking moment that frictional force caused. The calculation formula of the current and the electromagnetic braking torque of the accurate electromagnetic field regulator is as follows:
Wherein T b is a braking torque of the reconfigurable variable-gap electromagnetic braking module, r 2 is a distance from a terminal contact point of the hydraulic moment of inertia simulation module to the central rotation axis, μ is a friction coefficient between the terminal contact point of the hydraulic moment of inertia simulation module and the moment of inertia adjustment platform, m is the ball mass, g is a gravitational acceleration, and F is a linear thrust of the hydraulic moment of inertia simulation module.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts the reconfigurable variable-gap electromagnetic braking device based on the four-step structure to realize non-contact electromagnetic braking, has no friction loss, can ensure the long-term consistency of the torque change of the valve in the working state, and can also ensure the accuracy of torque control. The gap between the braking device and the strong magnetic field source is adjusted through a smooth four-step structure, and the resistance torque change curves of an initial rising stage, a torque peak value stage, a rapid falling stage and a tail end stable stage of the real valve in the opening process are fitted.
2. The invention discloses an electric valve actuator testing device based on variable-clearance electromagnetic braking, which is characterized in that hydraulic flow accurate control in microsecond level is realized through a multi-path micro valve unit, the micro valve unit is finally integrated into a high-precision micro valve hydraulic adjusting module, hydraulic oil is supplied to a hydraulic cylinder through an integrated output pipeline, a controller dynamically combines and independently adjusts the multi-path micro valve unit, the output moment of a hydraulic moment of inertia simulating module is adjusted, the moment of inertia of an inertia turntable is effectively changed, and the load characteristics of valves of different types are simulated.
3. The electric valve actuator testing device based on the variable-clearance electromagnetic braking can accurately reproduce the working state of a real valve through testing the valve within the angle range of 0-90 degrees. Meanwhile, the cyclic action of on-off-on-off of different types of valves under different operation conditions can be realized, a more real test environment is provided for verifying the performance of the electric valve actuator, the response speed and the output torque of the electric valve actuator under the actual working conditions are accurately tested, and the working stability of the electric valve actuator in the cyclic action is verified.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a torque transmission and measurement module according to the present invention;
FIG. 3 is a schematic diagram of an inertial turntable according to the present invention;
FIG. 4 is a schematic structural view of a reconfigurable variable gap electromagnetic brake apparatus of the present invention;
fig. 5 is a schematic structural diagram of the high-precision micro-valve hydraulic adjusting module of the present invention.
The hydraulic pressure control system comprises a reference numeral 1, a controller, a 10 high-precision micro valve hydraulic pressure adjusting module, a 101, a micro valve unit, a 102, a first integrated output pipeline, a 103, a second integrated pipeline, a 11, a hydraulic pump, a 12, an oil tank, a 13, a throttle valve, a 2, an electric valve actuator, a 3, a torque transmission and measuring module, a 31, a first coupler, a 32, a torque detection sensor, a 33, a second coupler, a 4, a current output adjusting module, a 5, a bracket, a 6, an inertia turntable, a 61, a central rotating shaft, a 62, an electromagnetic braking platform, a 63, an electromagnetic braking area, a 64, a moment of inertia adjusting platform, a 65, a moment of inertia adjusting area, a 7, a reconfigurable variable gap electromagnetic braking module, a 71, an initial ascending step, a 72, a torque peak step, a 73, a rapid descending step, a 74, a tail end stable step, an 8, a precise electromagnetic field regulator and a 9, and a hydraulic moment of inertia simulating module.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "configured to," "connected," and the like are to be construed broadly as, for example, "connected" may be fixedly connected, may be detachably connected, or integrally connected, may be mechanically connected or electrically connected, may be directly connected or indirectly connected through an intermediate medium, and may be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
1-5, The electric valve actuator testing device based on the variable gap electromagnetic braking comprises a controller 1, an electric valve actuator 2, a torque transmission and measurement module 3, a current output adjusting module 4, a bracket 5, an inertia turntable 6, a reconfigurable variable gap electromagnetic braking module 7, an accurate electromagnetic field adjuster 8, a hydraulic moment of inertia simulating module 9, a high-precision micro valve hydraulic adjusting module 10, a hydraulic pump 11, an oil tank 12 and a throttle valve 13.
The controller 1 is respectively connected with the electric valve actuator 2, the torque transmission and measurement module 3, the current output adjustment module 4 and the high-precision micro-valve hydraulic adjustment module 10, the controller 1 sends control signals to the electric valve actuator 2 to execute opening or closing actions of a valve and receive feedback signals of the electric valve actuator 2, the controller 1 receives measurement data of the torque transmission and measurement module 3, the controller 1 sends control signals to the current output adjustment module 4 to adjust the magnetic field intensity of the accurate electromagnetic field adjuster 8, and the controller 1 sends control signals to the high-precision micro-valve hydraulic adjustment module 10 to adjust the linear thrust of the hydraulic moment of inertia simulation module 9 and simulate the moment of inertia of valves of different types after the moment of torsion is converted into the moment of torsion.
The current output adjusting module 4 comprises a DAC chip, an operational amplifier, a current sampling resistor, an MOS tube and an ADC chip, wherein the DAC chip converts a digital signal sent by the controller 1 into an analog voltage, the analog voltage is used as a reference voltage to be input to a positive input end of the operational amplifier, an actual working current in the current sampling resistor detecting circuit is fed back to a negative input end of the operational amplifier, the operational amplifier compares the reference voltage with a feedback voltage of the current sampling resistor, the conduction degree of the MOS tube is adjusted according to a difference value between the reference voltage and the feedback voltage, the magnitude of the current output by the current output adjusting module 4 is further controlled, the ADC chip acquires a feedback signal, the controller 1 adjusts the output of the DAC chip in real time according to the feedback signal to form closed loop control, and the current is ensured to be stably output to the accurate electromagnetic field regulator 8 within the range of 0-2A.
The electric valve actuator 2 is a part of rotary electric actuator, and can control the rotary valve to realize the rotation operation with the angle range of 0-90 degrees, such as a plug valve, a butterfly valve, a ball valve and the like. The electric valve actuator 2 transmits the output rotational torque to the inertia turntable 6 through the torque transmission and measurement module 3.
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 turntable 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, and transmits the real-time torque value of the electric valve actuator 2 in the stationary state and in the rotating state to the controller 1.
The output torque of the electric valve actuator 2 needs to overcome the torque generated by three resistance sources existing in the valve, namely a braking torque for overcoming the friction of the valve, a fluid resistance torque for overcoming the fluid pressure and an inertia torque for overcoming the moment of inertia of the valve, and the output torque of the electric valve actuator 2 is calculated according to the formula:
T=Tb+Tr+Ti
Wherein T is the total torque output by the electric valve actuator 2, T b is the braking torque, T r is the fluid resistance torque, and T i is the moment of inertia.
The bracket 5 is used for supporting and fixing the inertia turntable 6, the accurate electromagnetic field regulator 8 and the hydraulic moment of inertia simulation module 9. The bottom of the bracket 5 is fixed with a central rotating shaft 61 of the inertia turntable 6 through a bearing seat, and the central rotating shaft 61 can freely rotate through a bearing. The upper part is provided with a hydraulic moment of inertia simulation module 9 through a flange plate, a side surface is fixedly provided with an accurate electromagnetic field regulator 8, a high-strength stable magnetic field source is provided for the reconfigurable variable-gap electromagnetic brake module 7, and a fixed connection mode is bolt fixed connection.
The inertia turntable 6 is a rotating device and comprises a central rotating shaft 61, an electromagnetic braking platform 62 and a rotational inertia adjusting platform 64, one end of the central rotating shaft 61 is connected with the torque transmission and measurement module 3, the other end of the central rotating shaft is fixed on the support 5 through a bearing, an electromagnetic braking area 63 is arranged on the electromagnetic braking platform 62, fixing holes are formed in two sides of the electromagnetic braking area 63 and used for fixedly mounting a reconfigurable gap-changing electromagnetic braking module 7, and cutting magnetic induction line movement is performed in a high-intensity stable magnetic field source provided by the accurate electromagnetic field regulator 8 and electromagnetic braking moment is generated. An arc-shaped groove is formed in the moment of inertia adjusting platform 64 and is used as a moment of inertia adjusting area 65, a rolling ball at the tail end of the hydraulic moment of inertia simulation module 9 is placed and positioned, and different additional loads are loaded in the moment of inertia adjusting area 65 by the hydraulic moment of inertia simulation module to realize the adjustment of the moment of inertia of the inertia turntable 6;
The reconfigurable gap-changing electromagnetic braking module 7 is designed into a four-step structure with smooth transition surface, the height of the four-step structure is gradually increased or decreased, the step height directly influences the gap size and gap change of the reconfigurable gap-changing electromagnetic braking module 7 and the accurate electromagnetic field regulator 8, so that the magnetic field intensity is changed, the rapid response of braking torque is achieved, meanwhile, the resistance torque change characteristics of different types of valves are met by designing different four-step structures, and the electromagnetic field intensity calculation formula is as follows:
Wherein L is an integral path, I is a current size, mu 0 is a vacuum magnetic permeability constant, D is a distance between the accurate electromagnetic field regulator 8 and the reconfigurable variable-gap electromagnetic braking module 7, h is a step height of the reconfigurable variable-gap electromagnetic braking module 7, θ is an included angle between a current element and a position vector of the reconfigurable variable-gap electromagnetic braking module 7, and dl is a micro line element of source current.
The reconfigurable gap-changing electromagnetic braking module 7 simulates four fluid resistance torque change stages of a real valve in the opening process through a four-step structure, dynamically adjusts electromagnetic braking torque, and under the condition that the height of the step structure is determined, the controller 1 outputs a control signal to the current output adjusting module 4, adjusts the current of the accurate electromagnetic field adjuster 8 to accurately adjust the electromagnetic field, and the calculation equation of the electromagnetic braking torque is as follows:
Tb＝r1σvz∫vB2dv
Wherein T b is the braking torque of the reconfigurable variable gap electromagnetic braking module 7, r 1 is the distance from the reconfigurable variable gap electromagnetic braking module 7 to the central rotating shaft 61, sigma is the conductivity of the reconfigurable variable gap electromagnetic braking module 7, v z is the linear speed of the inertial turntable 6, B is the electromagnetic field size of the accurate electromagnetic field regulator 8, and v is the volume of the reconfigurable variable gap electromagnetic braking module 7.
The four-step structure of the reconfigurable gap-changing electromagnetic braking module 7 corresponds to four fluid resistance torque change stages of a real valve in an opening process respectively, the four-step structure comprises an initial ascending step 71, a torque peak step 72, a rapid descending step 73 and a tail end stable step 74, the valve opening angle corresponding to the initial ascending step 71 is 0-30 degrees, the valve opening angle corresponding to the torque peak step 72 is 30-70 degrees, the hydrodynamic moment generated by fluid flow resistance rapidly ascends and reaches a peak value, the valve opening angle corresponding to the rapid descending step 73 is 70-85 degrees, the valve state corresponding to the stage is gradually separated from a main fluid effect, the torque rapidly descends, the valve opening angle corresponding to the tail end stable step 74 is 85-90 degrees, the valve is in a complete opening state corresponding to the valve, and the torque tends to be stable.
The hydraulic moment of inertia simulation module 9 is controlled by high accuracy micro valve hydraulic pressure regulation module 10, constitute moment of inertia regulation hydraulic circuit with hydraulic pump 11, oil tank 12, choke valve 13, high accuracy micro valve hydraulic pressure regulation module 10 is integrated by numerous micro valve unit 101, the oil-out of micro valve unit 101 all is connected to first integrated output pipeline 102 and second integrated pipeline 103, first integrated output pipeline 102 and second integrated pipeline 103 connect hydraulic cylinder's top oil pocket and bottom oil pocket in the hydraulic moment of inertia simulation module 9, the dynamic combination form and the on-off state of micro valve unit 101 are controlled to the control signal of controller 1, the hydraulic oil supply volume at accurate control hydraulic cylinder both ends, through the size and the speed of change hydraulic moment of inertia simulation module 9 output thrust change inertia carousel 6, realize the load characteristic simulation to different model valves in the actual operation in-process.
The end contact of the hydraulic moment of inertia simulation module 9 is ball contact, the ball moves in the moment of inertia adjustment area 65 and applies positive pressure to the inertia turntable 6, the ball simulates the load conditions of different types of valves, the ball is made of low friction coefficient materials, the surface of the moment of inertia adjustment platform 64 is provided with a specially treated low friction coating, friction between the ball and the surface of the platform is reduced, and the controller compensates additional braking torque caused by friction force by dynamically adjusting the current of the accurate electromagnetic field regulator. The relation between the current of the accurate electromagnetic field regulator 8 and the electromagnetic braking torque is:
wherein T b is a braking torque of the reconfigurable variable gap electromagnetic braking module 7, r 2 is a distance from a terminal contact point of the hydraulic moment of inertia simulation module 9 to the central rotation axis 61, μ is a friction coefficient between the terminal contact of the hydraulic moment of inertia simulation module 9 and the moment of inertia adjustment platform 64, m is a rolling ball mass, g is a gravitational acceleration, and F is a linear thrust of the hydraulic moment of inertia simulation module 9.
The hydraulic moment of inertia simulation module 9 and the reconfigurable gap-changing electromagnetic braking module 7 work cooperatively through the control of the controller 1, simulate the load characteristics of different signal valves and the resistance torque change process in actual work, the controller 1 adjusts the moment of inertia of the inertia turntable 6 according to the load characteristics of different types of valves through the hydraulic moment of inertia simulation module 9, the reconfigurable gap-changing electromagnetic braking module 7 simulates the resistance torque change curve in the actual work process of the valves 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 accurate electromagnetic field regulator 8, adjusts the braking torque of the inertia turntable 6, and compensates the friction force between the hydraulic moment of inertia simulation module 9 and the moment of inertia adjustment platform 64.
The foregoing is merely exemplary embodiments of the present invention, and specific structures and features that are well known in the art are not described in detail herein. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2339144C1 (en) * | 2007-07-19 | 2008-11-20 | Юрий Владимирович Шаров | Method for improving dynamic stability and damping oscillations of electric-power systems and device for its realisation |
| CN108313036A (en) * | 2018-01-11 | 2018-07-24 | 江苏大学 | A kind of electromagnet brake pedal apparatus and control method |
| CN111425540A (en) * | 2020-03-06 | 2020-07-17 | 奥创动力传动(深圳)有限公司 | An electromagnetic brake control device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2339144C1 (en) * | 2007-07-19 | 2008-11-20 | Юрий Владимирович Шаров | Method for improving dynamic stability and damping oscillations of electric-power systems and device for its realisation |
| CN108313036A (en) * | 2018-01-11 | 2018-07-24 | 江苏大学 | A kind of electromagnet brake pedal apparatus and control method |
| CN111425540A (en) * | 2020-03-06 | 2020-07-17 | 奥创动力传动(深圳)有限公司 | An electromagnetic brake control device |
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