CN112728195B - Electric valve and torque and stroke measuring system and method of actuator of electric valve - Google Patents
Electric valve and torque and stroke measuring system and method of actuator of electric valve Download PDFInfo
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- CN112728195B CN112728195B CN202110049181.7A CN202110049181A CN112728195B CN 112728195 B CN112728195 B CN 112728195B CN 202110049181 A CN202110049181 A CN 202110049181A CN 112728195 B CN112728195 B CN 112728195B
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- 238000000034 method Methods 0.000 title claims abstract description 31
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 18
- 230000002093 peripheral effect Effects 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 239000013307 optical fiber Substances 0.000 claims description 19
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- 238000012360 testing method Methods 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 3
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- 239000008358 core component Substances 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
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- 230000001939 inductive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0058—Optical means, e.g. light transmission, observation ports
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/14—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft
- G01L3/1407—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft involving springs
- G01L3/1421—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft involving springs using optical transducers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
The invention provides a torque and stroke measuring system of an electric valve and an actuator thereof, comprising: the electric valve actuator comprises a worm and a worm wheel, and an output shaft of the worm wheel is connected with a valve rod of a valve to be tested; the fiber bragg grating sensor is buried on the outer peripheral surface of the worm along the axis direction of the worm, so that the central wavelength of the fiber bragg grating sensor periodically changes along with the rotation of the worm; the rotor outgoing line of the optical signal rotary coupling assembly is connected with the tail fiber of the fiber grating sensor, and the stator outgoing line of the optical signal rotary coupling assembly is connected with the fiber grating demodulator; and the upper computer is connected with the fiber bragg grating demodulator and is used for collecting the central wavelength of the fiber bragg grating sensor in real time. The invention also provides a corresponding measuring method. The invention can synchronously obtain the torque and the stroke of the electric valve and the actuator thereof by measuring the wavelength offset of the fiber bragg grating, has simple and easy operation and high measurement precision, has the functions of electromagnetic interference resistance and irradiation resistance, and can be widely applied to the fields of measuring the torque and the stroke of the electric valve and the actuator thereof.
Description
Technical Field
The invention relates to the field of measurement of torque and stroke of valves and actuators, in particular to a system and a method for measuring torque and stroke of an electric valve and an actuator of the electric valve.
Background
The electric valve in the energy chemical industry (especially the nuclear power industry) is used as a key element for controlling the on-off, flow direction, flow rate, pressure, temperature and other key elements of flammable and explosive, toxic and harmful or corrosive media in a pipeline, and once the faults such as blockage and the like occur, huge economic loss and even casualties can be caused. The continuous and normal operation of the electric valve is critical to the safe and reliable operation of equipment in the energy and chemical industry. Among the many parameters that are relevant to the operating state and overall performance of an electrically operated valve, dynamically varying valve torque and travel are two important parameters. Therefore, it is necessary to make real-time, on-line, accurate measurements of the output shaft torque and travel of the electrically operated valve and its actuator. This will provide important basic data for the design and manufacture of the valve, as well as powerful technical support for preventive maintenance of the valve.
Valve torque is the force or torque required to drive the valve to open or close. The existing method for directly or indirectly measuring the torque of the electric valve and the actuator thereof comprises the following steps: torque sensor method, strain gage method, force sensor, surface acoustic wave method, and electric parameter method. The prior art discloses: a torque sensor is arranged between an output shaft of an electric actuator and a valve rod of a valve to be tested, and torque in a dynamic process of the valve is directly measured (specifically disclosed by a patent document CN 101943636A, a full-automatic valve electric device test bed and a test method thereof, a patent document CN 102012291A, a large-torque valve torque monitoring system, a patent document CN 105759786A, a valve remote fault diagnosis system based on the Internet of things technology, a patent document CN 106197558B, a valve state on-line monitoring system and a working method thereof, a patent document CN 106353018A, an electric valve dynamic torque continuous test device under a complex working condition, a patent document CN 109974770A, an electric valve state detection system and a method, a patent document CN 110579345A, a rotary valve electric actuator comprehensive test device, and a patent document CN111272414A, a high-pressure valve life test device); or a driven shaft adhered with a strain gauge is arranged between an output shaft of the electric actuator and a valve to be tested, and the output torque of the electric actuator is measured by measuring the stress in the direction of 45 degrees with the driven shaft (disclosed by a patent document CN201921394201.9 'an electric actuator with a torque measuring function', but the two methods destroy the integrity of the original system, are not suitable for on-line measurement, and a dynamic torque sensor is not suitable for torque measurement exceeding 5 ten thousand Nm. In addition, the prior art also discloses indirectly measuring valve torque by measuring the relationship between the output torque of the valve electric actuator and the motor electromagnetic and magnetic signals (specifically disclosed by a valve stem torque measuring device in patent document CN 2583652Y and an electric actuator valve stem torque measuring control device in patent document CN 201220119820.9), but such a method is susceptible to electromagnetic interference. In addition, the prior art also discloses that the axial thrust of the worm is measured by using a pressure sensor arranged on the end face of the worm shaft of the valve electric actuator (disclosed by a device for sensing torque by pressure in a patent document CN 2508079Y) or the axial displacement of the worm is measured by using an inductive sensor, so that the output torque of the electric actuator is indirectly measured, but the electric sensor is easy to be subjected to electromagnetic interference and is not resistant to irradiation, and cannot be applied to a nuclear power environment.
The stroke refers to the straight displacement or the angular displacement generated by the action of the valve rod of the matched valve driven by the output shaft of the valve actuator when the valve actuator rotates. The valve stroke measurement plays an important role in accurately acquiring the real-time valve position and guaranteeing the valve opening. The most widely applied field of valve stroke measurement at present is electric sensors such as potentiometers, encoders, hall sensors and the like, but the electric sensors are easy to be subjected to electromagnetic interference and are not irradiation-resistant, and cannot be applied to severe environments such as nuclear power.
At present, torque and stroke parameters representing valve states are often measured by different sensing devices, and no system and method can utilize one sensing device to realize synchronous measurement of torque and stroke of an electric valve and an actuator thereof.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a torque and stroke measuring system and a method for an electric valve and an actuator thereof, so as to accurately measure the running state of the electric valve and the actuator thereof in real time on line.
In order to achieve the above object, the present invention provides a torque and stroke measuring system for an electric valve and an actuator thereof, the device based on a fiber bragg grating sensor, comprising: an electric valve actuator, it is connected with the valve that awaits measuring for drive the valve that awaits measuring and open and close, it includes: the output shaft of the worm wheel is connected with the valve rod of the valve to be tested; the fiber bragg grating sensor is buried on the outer peripheral surface of the worm along the axis direction of the worm, so that the central wavelength of the fiber bragg grating sensor periodically changes along with the rotation of the worm; the rotor outgoing line of the optical signal rotary coupling assembly is connected with the tail fiber of the fiber grating sensor, and the stator outgoing line of the optical signal rotary coupling assembly is connected with a fiber grating demodulator and is used for transmitting fiber signals between the fiber grating sensor and the fiber grating demodulator; and the upper computer is connected with the fiber bragg grating demodulator and is used for collecting the center wavelength of the fiber bragg grating sensor in real time.
The upper computer is used for determining the valve torque to be measured through the center wavelength of the fiber bragg grating sensor and the relation between the center wavelength offset of the fiber bragg grating sensor and the output torque of the electric valve actuator; the upper computer is used for measuring the stroke of the valve to be measured through the numerical value of the change period of the central wavelength of the fiber bragg grating sensor.
The relation between the central wavelength offset of the fiber bragg grating sensor and the output torque of the electric valve actuator is obtained by calibrating the fiber bragg grating sensor and the electric valve actuator by using a calibration device.
The optical signal rotary coupling assembly includes: the optical fiber rotary joint comprises a tool left shell, a tool right shell, a left sleeve, a right sleeve, a first fixing plate, a second fixing plate and a spring, wherein the tool left shell, the tool right shell, the left sleeve, the right sleeve, the first fixing plate, the second fixing plate and the spring are used for fixedly connecting the optical fiber rotary joint; the left shell of the tool is fixedly connected with the shell of the electric valve actuator through bolts; the right shell of the tool is fixedly connected with the left shell of the tool through bolts; the left sleeve is in threaded connection with the worm, and the right sleeve is fixedly connected with the left sleeve through a bolt; the right side of the right sleeve is connected with the rotor side of the optical fiber rotary joint through a bolt; the first fixing plate is fixedly connected with the stator side of the optical fiber rotary joint through bolts; a spring is arranged between the first fixing plate and the second fixing plate, and the spring is fixedly connected with the first fixing plate and the second fixing plate by welding; the second fixing plate is fixedly connected with the right outer shell of the tool through bolts; the optical fiber rotary joint is provided with a rotor outgoing line and a stator outgoing line.
And a mounting groove is formed in the peripheral surface of the worm along the axial direction of the worm, and the fiber grating sensor is buried in the mounting groove by adopting a gluing or electroplating process.
In another aspect, the present invention provides a method for measuring torque and stroke of an electric valve and an actuator thereof, comprising:
s1: burying the fiber grating sensor on the outer peripheral surface of the worm along the axial direction of the worm;
s2: completing the assembly of an electric valve actuator comprising the worm, a worm wheel in matched connection with the worm and a motor connected with the worm;
s3: connecting a tail fiber of the fiber bragg grating sensor with a rotor outgoing line of an optical signal rotary coupling assembly; the stator outgoing line of the optical signal rotary coupling assembly is connected with a fiber grating demodulator, and the fiber grating demodulator is connected with an upper computer;
s4: obtaining the relation between the central wavelength offset of the fiber bragg grating sensor and the output torque of the electric valve actuator under different loads;
s5: connecting the electric valve actuator with a valve to be tested;
s6: the method comprises the steps that an electric valve actuator is adopted to drive a valve to be tested to act, when the valve to be tested acts, an upper computer is utilized to collect the center wavelength of a fiber grating sensor, and the torque of the valve to be tested is determined according to the center wavelength of the fiber grating sensor and the relation between the center wavelength offset of the fiber grating sensor and the output torque of the electric valve actuator; meanwhile, according to the numerical value of the change period of the center wavelength of the fiber bragg grating sensor, determining the stroke of the valve to be tested.
The step S1 includes: a mounting groove is formed in the outer peripheral surface of a worm of the electric valve actuator along the axial direction, and the fiber grating sensor is buried in the mounting groove by adopting a gluing or electroplating process.
In the step S4, the relationship between the central wavelength offset of the fiber bragg grating sensor and the output torque of the electric valve actuator under different loads is obtained by calibrating the electric valve actuator and the fiber bragg grating sensor.
The torque and stroke measuring system of the electric valve and the actuator thereof can realize the measurement of dynamic torque in the action process of the electric valve and the actuator thereof by measuring the center wavelength of the fiber grating sensor embedded in the peripheral surface of the worm in real time; meanwhile, the stroke of the electric valve and the actuator thereof can be measured by measuring the periodical change of the central wavelength of the fiber grating sensor buried on the surface of the worm along with the rotation of the worm. The invention adopts the fiber grating sensor, thus having the functions of electromagnetic interference resistance and irradiation resistance, convenient operation and high measurement precision, being widely applied to the fields of electric valves and executor torque and stroke measurement and having high engineering application value.
Drawings
FIG. 1 is a schematic diagram of the torque and travel measurement system of an electrically operated valve and its actuator of the present invention;
fig. 2 is a schematic structural view of an optical signal rotary coupling assembly in a torque and stroke measuring system of an electric valve and an actuator thereof according to the present invention.
Fig. 3 is a schematic structural view of a calibration device of a torque and stroke measuring system of an electric valve and an actuator thereof according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention, namely, a torque and stroke measuring system of an electric valve and an actuator thereof, based on a fiber grating sensor 11, includes:
a valve base 1 fixed on a plane by anchor bolts 2;
the valve 3 to be tested is fixedly connected to the valve base 1;
the mounting bracket 4 is fixedly connected to the valve base 1;
an electric valve actuator 5 fixed at the top end of the mounting bracket 4 and connected with the valve 3 to be tested, and used for driving the valve 3 to be tested to be opened and closed; the electric valve actuator 5 includes: a worm 6, a worm wheel (not shown) cooperatively connected with the worm 6, and a motor (not shown) connected with the worm 6, wherein:
the worm 6 is a horizontal rotating shaft with the diameter of about 2cm, the length of about 25cm and the rotating speed of about 600r/min, and the outer peripheral surface of the worm is provided with a mounting groove 7 with the width of about 1mm and the length of about 10 cm;
the output shaft of the worm gear is connected with the valve rod of the valve 3 to be tested through a coupler 8;
the fiber grating sensor 11 is buried on the outer peripheral surface of the worm 6 along the axial direction of the worm 6, so that the fiber grating sensor 11 rotates at a high speed along with the worm 6, and the central wavelength of the fiber grating sensor changes periodically along with the rotation of the worm; in this embodiment, the fiber bragg grating sensor 11 has two packaging modes, one is that the fiber bragg grating sensor 11 is embedded in the mounting groove 7 on the outer peripheral surface of the worm 6 by using epoxy resin glue; secondly, the surface layer of the fiber bragg grating sensor 11 is buried in the mounting groove 7 on the outer peripheral surface of the worm 6 by adopting an electroplating process;
the optical signal rotary coupling assembly 12, whose rotor outgoing line (left side in the figure) is connected with the tail fiber of the fiber grating sensor 11 on the outer peripheral surface of the worm 6, and whose stator outgoing line 13 (right side in the figure) is connected with the fiber grating demodulator 14, for transmitting the fiber signal between the fiber grating sensor 11 rotating at high speed along with the worm 6 and the fiber grating demodulator standing;
as shown in fig. 2, the optical signal rotary coupling assembly 12 includes: the optical fiber rotary joint 125, a tool left housing 123 for fixed connection of the optical fiber rotary joint, a tool right housing 124, a left sleeve 121, a right sleeve 122, a first fixing plate 126, a second fixing plate 128, a spring 127, and the like. Specifically, the left tool casing 123 is fixedly connected with the casing of the electric valve actuator 5 through bolt connection; the right tool casing 124 is fixedly connected with the left tool casing 123 through bolts; the left sleeve 121 is in threaded connection with the worm 6, and the right sleeve 122 is fixedly connected with the left sleeve 121 through bolts; the right side of the right sleeve 122 is connected with the rotor side of the optical fiber rotary joint 125 by bolts; the first fixing plate 126 is fixedly connected with the stator side of the optical fiber rotary joint 125 through bolts; a spring 127 is arranged between the first fixing plate 126 and the second fixing plate 128, and the spring is fixedly connected with the first fixing plate 126 and the second fixing plate 128 by welding, so that the first fixing plate 126, the spring 127 and the second fixing plate 128 are an integral body; the second fixing plate 128 is fixedly connected with the tool right shell 124 through bolts. Fiber optic rotary joint 125 is the core component of optical signal rotary coupling assembly 12, having rotor and stator outlets 13 as described above. In this embodiment, the rotor outgoing line is connected to the tail fiber of the fiber grating sensor 11 through a fiber coupler, and the stator outgoing line 13 is connected to the fiber grating demodulator 14 through a fiber coupler. In other embodiments, the rotor outgoing line and the tail fiber of the fiber grating sensor 11, and the stator outgoing line 13 and the fiber grating demodulator 14 may be connected in other manners.
The torque and travel measuring system of the electric valve and its actuator further comprises a host computer 16 connected to the fiber grating demodulator 14 for real-time acquisition and recording of the center wavelength of the fiber grating sensor 11.
When the axial force of the worm 6 changes, the center wavelength of the fiber grating sensor 11 changes, so that the upper computer 16 can determine the torque of the valve 3 to be measured through the center wavelength of the fiber grating sensor 11 and the relationship between the center wavelength offset of the fiber grating sensor 11 and the output torque of the electric valve actuator 5 (i.e. the torque of the valve 3 to be measured).
The relationship between the central wavelength offset of the fiber bragg grating sensor 11 and the output torque of the electric valve actuator 5 (i.e., the torque of the valve 3 to be measured) can be obtained by calibrating the fiber bragg grating sensor 11 and the electric valve actuator 5 by using a calibration device, so that the relationship between the central wavelength offset of the fiber bragg grating sensor 11 and the output torque of the electric valve actuator 5 (i.e., the torque of the valve 3 to be measured) can be obtained after the calibration device is used for calibrating, and therefore the central wavelength change of the fiber bragg grating sensor 11 can be directly mapped to obtain the torque change of the valve 3 to be measured.
In addition, since the fiber grating sensor 11 is buried on the outer peripheral surface of the worm 6, when the worm wheel of the electric valve actuator 5 and the worm 6 are engaged and driven, the axial force on the cross section of the worm 6 is not uniform, so the center wavelength of the fiber grating sensor 11 periodically changes with the change of the worm wheel and worm engagement position in the electric valve actuator, that is, the center wavelength of the fiber grating sensor 11 periodically changes with the rotation of the worm 6, thereby the upper computer 16 is set to realize the measurement of the stroke of the valve 3 to be measured by the value of the change period of the center wavelength of the fiber grating sensor.
In this embodiment, as shown in fig. 3, the calibration device is obtained by replacing the valve 3 to be tested of the torque and stroke measuring system of the electric valve and the actuator thereof of the present invention with a friction type torque limiter 31, replacing the coupler 8 with a torque sensor 81 fixedly mounted on the mounting bracket 4, and connecting the torque sensor 81 with the output shaft of the worm wheel through the first coupler 9 and with the friction type torque limiter 31 through the second coupler 10, and simultaneously connecting the torque sensor 81 with a torque signal detecting module 15, and connecting the torque signal detecting module 15 with the host computer 16. In other embodiments, it is also possible to obtain the relationship between the center wavelength shift of the fiber grating sensor 11 and the output torque of the electric valve actuator 5 (i.e., the torque of the valve 3 to be measured) by other calibration means.
In addition, the optical fiber used in this embodiment is a single mode fiber, and the initial center wavelength is 1550nm.
Based on the torque and stroke measuring system of the electric valve and the actuator thereof, the method for measuring the torque and the stroke of the electric valve and the actuator thereof comprises the following steps:
step S1: the fiber grating sensor 11 is buried on the outer peripheral surface of the worm 6 along the axial direction of the worm 6;
the step S1 specifically includes:
an installation groove 7 is formed in the outer peripheral surface of the worm 6 of the electric valve actuator 5 along the axial direction, and the fiber grating sensor is buried in the installation groove 7 by adopting a gluing or electroplating process method.
Step S2: the assembly of the electric valve actuator 5 comprising the worm 6, the worm wheel cooperatively connected with the worm 6 and the motor connected with the worm 6 is completed.
Step S3: connecting the tail fiber of the fiber bragg grating sensor 11 in the step S1 with a rotor outgoing line of a fiber bragg grating rotary joint connecting tool 12, so as to realize fiber bragg grating signal transmission between the fiber bragg grating sensor 11 rotating along with the worm 6 at a high speed and the standing fiber bragg grating demodulator 14; the stator outgoing line of the optical fiber rotary joint connecting tool 12 is connected with an optical fiber grating demodulator 14, and the optical fiber grating demodulator 14 is connected with an upper computer 16 for collecting the center wavelength of the optical fiber grating sensor 11 in real time later;
step S4: calibrating the installed electric valve actuator 5 and the fiber bragg grating sensor 11 to obtain the relation between the central wavelength offset of the fiber bragg grating sensor 11 and the output torque of the electric valve actuator 5 under different loads;
the step S4 specifically includes:
step S41: connecting a torque sensor 81 with the electric valve actuator 5 to be calibrated, and providing a friction torque limiter 31 to form a calibration device;
the step S41 specifically includes: the output shaft of the worm wheel 6 is connected with one end of a torque sensor 81 fixedly mounted on the mounting bracket 4 through a first coupling 9, and the other end of the torque sensor 81 is connected with a friction type torque limiter 31 fixedly mounted on the mounting bracket 4 through a second coupling 10; in addition, the step S41 may further include: the torque sensor 81 is connected with a torque signal detection module 15, and the torque signal detection module 15 is connected with an upper computer 16 for collecting the output torque of the electric valve actuator 5;
step S42: opening the electric valve actuator 5, collecting the output torque of the electric valve actuator 5 through a torque sensor 81, and collecting the change of the central wavelength through a fiber bragg grating sensor 11;
step S43: the step S42 is repeated by adjusting a friction torque limiter 31 to change the load of the electric valve actuator 5;
step S44: and repeating the step S43 to obtain the relation between the central wavelength offset of the fiber bragg grating sensor 11 and the output torque of the electric valve actuator 5 under different loads so as to calibrate the electric valve actuator 5 and the fiber bragg grating sensor 11.
In some other embodiments, calibration may not be performed, and other methods such as finite element simulation may be used to determine the relationship between the center wavelength offset of the fiber bragg grating sensor 11 and the output torque of the electric valve actuator 5 under different loads, so step S4 may be omitted.
Step S5: connecting the electric valve actuator 5 with the valve 3 to be tested to form a torque and stroke measuring system of the electric valve and the actuator thereof;
step S6: the valve 3 to be tested is driven to act by adopting the electric valve actuator 5, when the valve 3 to be tested acts, the upper computer 16 is used for collecting the central wavelength of the fiber bragg grating sensor 11, and the torque of the valve 3 to be tested is calculated according to the central wavelength of the fiber bragg grating sensor 11 and the relation between the central wavelength offset of the fiber bragg grating sensor and the output torque of the electric valve actuator; meanwhile, the stroke of the valve 3 to be measured is calculated according to the value of the change period of the center wavelength of the fiber bragg grating sensor 11.
In summary, the fiber grating sensor is buried in the outer peripheral surface of the worm, the rotor outgoing line is fixed with the worm by utilizing the fiber rotary joint, and the stator outgoing line is connected with the fiber grating demodulator; the fiber bragg grating demodulator is further connected with the upper computer, and the central wavelength of the fiber bragg grating sensor can be monitored in real time by the upper computer, so that synchronous measurement of torque and stroke of the electric valve and the actuator thereof is realized. Compared with the prior art, the invention has the following advantages:
1. the fiber bragg grating sensor is adopted, the precision is higher than that of the existing sensor, and the transmission loss is small;
2. is not interfered by the running environment factors such as irradiation, electromagnetism and the like;
3. ultra-long-distance data transmission can be realized;
4. the volume is very small, the weight is light, and the design of the existing valve is not influenced;
5. low cost, long service life and low failure rate.
6. Compared with the existing torque measuring device, the technical scheme has the advantages of being long-range, real-time, on-line monitoring, high in accuracy and the like.
7. Compared with the existing travel measuring device, the technical scheme has the advantages of high resolution and the like.
8. Synchronous measurement of torque and travel is achieved using a measurement device.
The invention accords with the national intelligent manufacturing direction, is a new technology with the characteristics of industry 4.0 and the Internet of things, and can obviously improve the technical level of high-end electric valves and actuators thereof in China by implementing the technology, thereby realizing the technical upgrading of traditional industrial products.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and various modifications can be made to the above-described embodiment of the present invention. All simple, equivalent changes and modifications made in accordance with the claims and the specification of the present application fall within the scope of the patent claims. The present invention is not described in detail in the conventional art.
Claims (6)
1. A torque and travel measurement system for an electrically operated valve and its actuator, comprising:
an electric valve actuator, it is connected with the valve that awaits measuring for drive the valve that awaits measuring and open and close, it includes: the output shaft of the worm wheel is connected with the valve rod of the valve to be tested;
the fiber bragg grating sensor is buried on the outer peripheral surface of the worm along the axis direction of the worm, so that the central wavelength of the fiber bragg grating sensor periodically changes along with the rotation of the worm;
the rotor outgoing line of the optical signal rotary coupling assembly is connected with the tail fiber of the fiber grating sensor, and the stator outgoing line of the optical signal rotary coupling assembly is connected with a fiber grating demodulator and is used for transmitting fiber signals between the fiber grating sensor and the fiber grating demodulator; and
the upper computer is connected with the fiber bragg grating demodulator and is used for collecting the center wavelength of the fiber bragg grating sensor in real time;
the upper computer is used for determining the valve torque to be measured through the center wavelength of the fiber bragg grating sensor and the relation between the center wavelength offset of the fiber bragg grating sensor and the output torque of the electric valve actuator; the upper computer is arranged to realize the measurement of the stroke of the valve to be tested through the numerical value of the change period of the central wavelength of the fiber bragg grating sensor;
the relation between the central wavelength offset of the fiber bragg grating sensor and the output torque of the electric valve actuator is obtained by calibrating the fiber bragg grating sensor and the electric valve actuator by using a calibration device.
2. The electric valve and its actuator torque and travel measurement system of claim 1, wherein the optical signal rotary coupling assembly comprises: the optical fiber rotary joint comprises a tool left shell, a tool right shell, a left sleeve, a right sleeve, a first fixing plate, a second fixing plate and a spring, wherein the tool left shell, the tool right shell, the left sleeve, the right sleeve, the first fixing plate, the second fixing plate and the spring are used for fixedly connecting the optical fiber rotary joint; the left shell of the tool is fixedly connected with the shell of the electric valve actuator through bolts; the right shell of the tool is fixedly connected with the left shell of the tool through bolts; the left sleeve is in threaded connection with the worm, and the right sleeve is fixedly connected with the left sleeve through a bolt; the right side of the right sleeve is connected with the rotor side of the optical fiber rotary joint through a bolt; the first fixing plate is fixedly connected with the stator side of the optical fiber rotary joint through bolts; a spring is arranged between the first fixing plate and the second fixing plate, and the spring is fixedly connected with the first fixing plate and the second fixing plate by welding; the second fixing plate is fixedly connected with the right outer shell of the tool through bolts; the optical fiber rotary joint is provided with a rotor outgoing line and a stator outgoing line.
3. The system for measuring torque and stroke of an electric valve and an actuator thereof according to claim 1, wherein a mounting groove is formed in an outer circumferential surface of the worm in an axial direction thereof, and the fiber bragg grating sensor is buried in the mounting groove by a sizing or plating process.
4. An electric valve and a torque and stroke measuring method of an actuator thereof, characterized by comprising:
step S1: burying the fiber grating sensor on the outer peripheral surface of the worm along the axial direction of the worm;
step S2: completing the assembly of an electric valve actuator comprising the worm, a worm wheel in matched connection with the worm and a motor connected with the worm;
step S3: connecting a tail fiber of the fiber bragg grating sensor with a rotor outgoing line of an optical signal rotary coupling assembly; the stator outgoing line of the optical signal rotary coupling assembly is connected with a fiber grating demodulator, and the fiber grating demodulator is connected with an upper computer;
step S4: obtaining the relation between the central wavelength offset of the fiber bragg grating sensor and the output torque of the electric valve actuator under different loads;
step S5: connecting the electric valve actuator with a valve to be tested;
step S6: the method comprises the steps that an electric valve actuator is adopted to drive a valve to be tested to act, when the valve to be tested acts, an upper computer is utilized to collect the center wavelength of a fiber grating sensor, and the torque of the valve to be tested is determined according to the center wavelength of the fiber grating sensor and the relation between the center wavelength offset of the fiber grating sensor and the output torque of the electric valve actuator; meanwhile, according to the numerical value of the change period of the center wavelength of the fiber bragg grating sensor, determining the stroke of the valve to be tested.
5. The method for measuring torque and stroke of an electric valve and an actuator thereof according to claim 4, wherein the step S1 comprises: a mounting groove is formed in the outer peripheral surface of a worm of the electric valve actuator along the axial direction of the worm, and the fiber grating sensor is buried in the mounting groove by adopting a gluing or electroplating process.
6. The method according to claim 4, wherein in the step S4, the relationship between the center wavelength offset of the fiber bragg grating sensor and the output torque of the electric valve actuator under different loads is obtained by calibrating the electric valve actuator and the fiber bragg grating sensor.
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| CN113418567A (en) * | 2021-07-30 | 2021-09-21 | 杭州高品自动化设备有限公司 | Door actuator maximum force testing and BUMPER profile detection device and working method |
| CN115931339A (en) * | 2021-09-24 | 2023-04-07 | 西门子瑞士有限公司 | Method and device for detecting characteristic parameters of valve |
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