CN102607822B - Air pressure-loading valve positioner testing stand - Google Patents
Air pressure-loading valve positioner testing stand Download PDFInfo
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- CN102607822B CN102607822B CN201110027553.2A CN201110027553A CN102607822B CN 102607822 B CN102607822 B CN 102607822B CN 201110027553 A CN201110027553 A CN 201110027553A CN 102607822 B CN102607822 B CN 102607822B
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Abstract
The invention discloses a kind of air pressure-loading valve positioner testing stand, including: true controlling organization pneumatic actuator matching used with tested valve door holder, the air pressure loading system simulating controlled valve operating mode being connected with pneumatic actuator outfan, the test regulation component of measuring air pressure, the detection case being connected with valve positioner are provided to tested valve door holder.This air pressure loading system includes: the reverse execution device being rotationally connected with pneumatic actuator outfan, provides the load regulation component loading air pressure to reverse execution device.Adjust the output pressure of load regulation component, thus it is possible to vary the size of the reactive torque of reverse execution device, it is achieved act on the change of load on pneumatic actuator outfan.Its advantage is, the air pressure loading system that the small-sized executor reversely used is constituted, for the load behavior of the controlled valve of simulated field so that the actual environment that the test condition of valve positioner truly uses closer to it.
Description
Technical field
The present invention relates to detect equipment technical field, especially relate to detect the air pressure-loading testing stand of valve positioner.
It is applicable to the valve positioner manufacturer testing equipment as simulated field, is particularly suitable for rotary angle stroke
The test of localizer.Can be applicable to the actuator load test rotated less than 90 °.
Background technology
Existing load test stand typically use frictional force as load, either electromagnetism magnetic powder load, hydraulic pressure dish-style dish
Formula friction-loaded, is all that frictional force is as test load.
It is higher that existing load test stand totally purchases valency, load be all use be all specialty braking equipment, it is generally required to
Another standby power source, such as electromagnetism, hydraulic pressure etc..
For the exercise test within low 90 ° of movement velocity, electromagnetism loads poor controllability, hydraulic load platform for low speed
Volume is relatively big, and needs additional liquid pressurized equipment.
And no matter electromagnetism or hydraulic load is commonly available to multipurpose rotary formula exercise test, for this 1/4
Carry out load friction in the range of circle, monolateral stress, load device abrasion inequality can be caused, damage and accelerate.
No matter testboard on the market uses the mode that hydraulic loaded or electromagnetism/magnetic powder load, and need to separately purchase load device,
Being equipped with the energy, bulky, price is high, is suitably applied the equipment test of multipurpose rotary.
Summary of the invention
In order to overcome the defect of above-mentioned prior art, the present invention provides a kind of air pressure-loading valve positioner testing stand.
The present invention solves above-mentioned technical problem, be dependent on what following technical proposals realized:
Air pressure-loading valve positioner testing stand, including: true controlling organization matching used with tested valve door holder
Pneumatic actuator, the air pressure loading system simulating controlled valve operating mode being connected with pneumatic actuator outfan, to tested valve
Localizer provides the test regulation component of measuring air pressure, the detection case being connected with valve positioner.Described air pressure loading system bag
Include: the reverse execution device being rotationally connected with pneumatic actuator outfan, the load pressure regulation loading air pressure is provided to reverse execution device
Assembly.Adjust the output pressure of load regulation component, thus it is possible to vary the size of the reactive torque of reverse execution device, it is achieved act on
The change of the load on pneumatic actuator outfan.Adjust the output pressure of test regulation component, the reality of analog valve door holder
During the work of border, scene is for the change of gaseity.
Described reverse execution device is rotary shaft to be connected as the rotary shaft of mechanical input with the outfan of pneumatic actuator,
One air cavity is connected with pneumatic supply, and its rotary shaft applies reactive torque to the rotary shaft of pneumatic actuator, and reversely use is small-sized
Executor.
Described pneumatic actuator is double-acting type, and two air pressure interfaces of tested valve door holder (1) are held with pneumatic respectively
Two air cavitys of row device connect.
Described test regulation component is that input is connected with compressed gas source, outfan and the air pressure input port of tested localizer
Three cross gas circuits connected, including: low pressure regulating pressure valve and the low pressure gas circuit of low tension switch series connection, middle pressure pressure regulator valve and in press off
Close the high-pressure gas circuit that the middle pressure gas channel of series connection, compressed gas source and high-voltage switch gear are straight-through.By selecting different gas circuit respectively, simulate work
Make the on-the-spot three kinds bleed pressure for gaseity.
Described reverse execution device is double-acting type, two air cavitys of reverse execution device respectively with load two of regulation component
Air pressure interface connects.Described load regulation component is that input is connected with compressed gas source, and load pressure regulator valve and reversal valve are connected
Pressure regulation commutation gas circuit.The outbound course of switching reversal valve, it is achieved the conversion of the reactive torque of reverse execution device, dummy activity is at gas
Two-way load in dynamic executor's rotary shaft.
Described testing stand is additionally provided with for quickly connecting the air cavity of pneumatic actuator 2 and the air pressure interface of tested localizer
Gas circuit quick assembling mechanism.Described gas circuit quick assembling mechanism includes: the gas contiguous block of the air pressure interface of connecting positioner, promotes gas to connect
The Direct Travel cylinder of block, controls the reversal valve of Direct Travel cylinder.
Described testing stand is additionally provided with for eliminating in test process, the resetting shaft of tested valve door holder and pneumatic execution
The elimination return difference mechanism in gap is turned round between the rotary shaft of device.Described elimination return difference mechanism includes: fast with the resetting shaft of localizer
The spacing locating shaft that speed connects, compresses the compact heap of resetting shaft, to the stage clip of compact heap pressure, is fixed on the rotation of pneumatic actuator
The locating shaft base of rotating shaft upper end.
The advantage of employing technical solution of the present invention is:
1. pneumatic actuator 2 is as the control object of tested valve door holder 1, is actually used legitimate object, reversely
Executor 3 is connected with pneumatic actuator 2 outfan, for the load behavior of the controlled valve of simulated field so that valve positioner
The actual environment that truly uses closer to it of test condition.
2. the air pressure loading system that reverse execution device 3 is constituted, the load of simulation pneumatic actuator 2, source of the gas can be after adjusting
Keeping load constant in whole test process, load mode is simple.
3. the energy of two double acting pneumatic actuators and tested localizer is general, and the crucial of testing stand constitutes object list
One, pneumatic actuator is bought convenient as standardized product, object.
4., before and after quick assembling mechanism is easy to test, when loading and unloading tested localizer 1, the air pressure interface of tested localizer can be quick
It is connected to the air cavity of pneumatic actuator 2.
5. return difference mechanism can eliminate between the revolution between resetting shaft and the rotary shaft of pneumatic actuator of tested localizer
Gap, quick connection when also helping the tested localizer of handling, between resetting shaft and rotary shaft.
Accompanying drawing explanation
Fig. 1 and Fig. 2 is the structure principle chart of the double acting pneumatic actuator that testing stand of the present invention uses.
Fig. 3 is the system block diagram of air pressure-loading valve positioner testing stand of the present invention.
Fig. 4 is the pneumatic schematic diagram of the embodiment of the present invention.
Fig. 5 is the mounting structure schematic diagram of embodiment of the present invention valve positioner testing stand.
Fig. 6 is the gas circuit quick assembling mechanism schematic diagram of the embodiment of the present invention.
Fig. 7 is the top view of Fig. 6.
Fig. 8 is another gas circuit quick assembling mechanism schematic diagram of the embodiment of the present invention.
Fig. 9 is the top view of Fig. 8.
Figure 10 is the sectional view of the elimination return difference mechanism of the embodiment of the present invention.
Figure 11 is the left view of the elimination return difference mechanism of the embodiment of the present invention.
Figure 12 is the top view of the elimination return difference mechanism of the embodiment of the present invention.
Figure 13 is the logic block of the tested valve door holder control circuit that the detection case 7 with the embodiment of the present invention is connected
Figure.
Figure 14 is measured object of the present invention, and intelligent valve positioner connects pneumatic actuator and the operation principle of controlled valve
Figure.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the invention are described in detail.
The present invention is to utilize two rotary angle stroke double-acting pneumatic actuators as double acting intelligent valve positioner 1
The air pressure-loading valve positioner testing stand of test load.
This testing stand includes a controlling organization pneumatic actuator 2 the most supporting with tested intelligent valve positioner 1,
The air pressure loading system that one small-sized executor reversely used simulating the load of controlled valve is constituted, also includes one for soon
Speed connects the gas circuit quick assembling mechanism of the air cavity of pneumatic actuator 2 and the air-path interface of tested valve door holder 1, and one is used for eliminating
The elimination return difference mechanism in gap is turned round between tested valve door holder and pneumatic actuator.
As shown in Figure 1 and Figure 2, its principle is the structure of rotary angle stroke double-acting pneumatic actuator, cylinder two-chamber A/B
Between pressure reduction promote piston, and the moment of torsion output of rotary shaft thrust become by rack geared, and then band movable valve
Carry out corresponding spinning movement.Fig. 1 represents counterclockwise rotation, and compressed air is inputted entrance center by A mouth, makes left and right piston
Moving in outward direction, rotary shaft counterclockwise rotates, and the air outside two-piston is discharged by B mouth；Fig. 2 represents side clockwise
To rotation, compressed air is entered both sides by the input of B mouth, makes left and right piston move to center, and rotary shaft is rotated clockwise, and two
Air in the middle of piston is discharged by A mouth.
The mounting structure of testing stand is as shown in Figure 5.Tested valve door holder 1 is placed on a sheet metal structural support 23,
Support fastened by screw is on pneumatic actuator 2.Select the rotary angle stroke pneumatic executor 2 of cylinder diameter 210mm fixed with valve
The position supporting connection of device 1, the resetting shaft of tested valve door holder 1 bottom rotates with the output of rotary angle stroke pneumatic executor 2
The upper end of axle connects, it is to be noted that the rotary shaft of pneumatic actuator to be ensured 2 is concentric with the resetting shaft of valve positioner 1.
For the simulated field various pipeline flow of controlled valve, the rotary angle row selecting another cylinder diameter to be 105mm
Journey pneumatic actuator reversely uses, and constitutes reverse execution device 3.The rotary shaft of reverse execution device controls with tested valve door holder 1
Pneumatic actuator 2 output rotary shaft lower end connect, to reverse execution device air cavity provide adjustable loading air pressure, be used for
The various pipeline flow of the controlled valve of simulated field, as the mechanical load of pneumatic actuator 2 during test.Double acting is pneumatic
One critically important feature of executor is, under constant air pressure, in whole rotary course, moment of torsion keeps constant.So this load
Just the demand of test is met.
As it is shown in figure 5, use the square tube of 100 × 100 to do Change-over frame 24 in echelon, reverse execution device 3 is inverted
In lifting testing stand, it is positioned at the underface of pneumatic actuator 2.The bottom of the rotary shaft of pneumatic actuator has an anise to sink
Hole, is suitable for placing foursquare axle, can be spaced 45 ° and put into.The anistree counterbore of the rotary shaft upper end of reverse execution device 3, the most right
The anistree counterbore of the rotary shaft bottom of pneumatic actuator 2.Make a foursquare bridge shaft, by the rotation of two pneumatic actuators
Axle couples together, and notes ensureing that two pneumatic actuator rotary shafts are concentric.
When the rotary shaft of pneumatic actuator 2 rotates motion, the rotary shaft of reverse execution device 3 will be driven to revolve together
Turn.It is passed through constant air pressure at this moment to the corresponding air cavity of reverse execution device 3, causes constant reactive torque to rotating, be the formation of
The constant load of process of the test.
The system block diagram of testing stand is as it is shown on figure 3, regulate the signal source (4～20mA) of detection case, tested valve door holder 1
By the deviation size and Orientation of the actual value according to pneumatic actuator 2 rotary shaft corner with the set-point of detection case output, output
Corresponding control command, is i.e. converted into gas signal and controls the electric conversion module of tested valve location by controlling the signal of telecommunication, and by
Electric conversion module output gas signal drives air inlet or the aerofluxus of pneumatic actuator 2 two-chamber A/B.And according to pneumatic actuator 2
Mechanical position feedback, tested valve door holder 1 controls the air inlet of given pneumatic actuator 2 two-chamber.Pneumatic actuator 2 is due to internal
Two-chamber A/B enters the pressure reduction of gas so that it moves clockwise or counterclockwise.
In input air pressure path, before test regulation component 4 is connected to double-purpose valve door holder 1, play simulated field
Situation during various air pressure, usual 0.4～7Bar is adjustable.Before load regulation component 5 is connected to reverse execution device 3, play tune
The effect of the size and Orientation of the reactive torque of joint reverse execution device 3.
As shown in the pneumatic schematic diagram of Fig. 4 embodiment, source of the gas accesses testing stand from 2/2-way manual ball valve 8, then divides
Three tunnels are respectively supplied to the Direct Travel cylinder 19 of gas circuit quick assembling mechanism 6, tested valve door holder 1 and the controlled valve operating mode of simulation
The reverse execution device 3 of air pressure loading system.
Source of the gas the first branch enters Direct Travel cylinder 19 by a 3-position 4-way hand-operated valve 18.3-position 4-way hand-operated valve 18
Air inlet P can the switching of two states be connected with two plunger shaft of Direct Travel cylinder 19 respectively.
When P-A path connected by 3-position 4-way hand-operated valve 18, the piston big chamber A air inlet of Direct Travel cylinder 19, air pressure promotes
Piston advances forward, the B-R path that the piston loculus B of Direct Travel cylinder 19 is connected by 3-position 4-way hand-operated valve 18 is outwardly arranged
Gas；When P-B path connected by 3-position 4-way hand-operated valve 18, the piston loculus B air inlet of Direct Travel cylinder 19, air pressure promote piston to
Rear motion, the A-R path outwardly aerofluxus that the piston big chamber A of Direct Travel cylinder 19 is connected by 3-position 4-way hand-operated valve 18.
A gas contiguous block 20 is connected, in test job, by manipulation three in the piston rod front end of Direct Travel cylinder 19
Four-way hand-operated valve 18, straight stroke air cylinder 19 just can quickly promote and retract gas contiguous block 20 so that gas contiguous block 20 is with tested
Pressing of valve positioner 1 connects and sharp separation, installs the workload of tested valve door holder 1 sum, also drop before reducing test
Low each installation tested valve door holder 1 will reconnect the workload of gas circuit.
Source of the gas the second branch enters double-purpose valve door holder 1.
As shown in Fig. 4 pneumatic schematic diagram, source of the gas, before supply tested valve door holder 1, is introduced into the defeated of regulation component 4
Entering end, the outfan of regulation component 4 is connected with the air pressure input port of tested valve door holder 1.Three gas of regulation component 4 parallel connection
The low pressure gas circuit of road, respectively low pressure regulating pressure valve 10 and low tension switch 9 series connection, middle pressure pressure regulator valve 12 and Medium voltage switch or circuit breaker 11 series connection
Middle pressure gas channel, source of the gas and the straight-through high-pressure gas circuit of high-voltage switch gear 13.Select to be suitable for by three baroswitches in three gas circuits
Test air pressure.
Test air pressure is introduced into tested valve door holder 1, and valve positioner 1 controls to enter 2 two air cavitys of pneumatic actuator
The air pressure of A/B.Valve positioner 1 is by detecting the machine feedback of pneumatic actuator 2 so that pneumatic actuator 2 is positioned at one
Given position.
The time length difference that three kinds of different test air pressure plays to make pneumatic actuator move to anchor point, observable valve
Door holder 1 to control and feedback signal gather hysteresis and sensitivity.
In order to improve the testing efficiency of testing stand, the several pressure of Test-bed Design, low pressure, medium and high pressure be set as respectively
2Bar, 4Bar and total head (7Bar).Although this function can be got final product easily by the given signal of telecommunication by a current to pneumatic converter
Switching, and also each little variable quantity air pressure can be obtained.But the price of a usual electric converter is common more than 10
Air relief valve, and actual test is not required to diversified air pressure, as long as so consider low pressure that simulated field is likely to occur, in
Pressure, high pressure are designed, and need not add air relief valve again under high-pressure situations, lead directly to just.Calm the anger basic, normal, high
Road is loaded onto air circuit breaker respectively, can open or close the most respectively.
In order to identify the air pressure being actually reached tested valve door holder 1, we have installed a Pressure gauge 14 additional determined
In gas circuit before the device of position, convenient reading actual pressure value.
1 two air pressure interfaces of tested valve door holder connect respectively the filling of two air cavity A/B air pressure of pneumatic actuator 2,
Venting, controls the pressure of two air cavity A/B of pneumatic actuator 2 by valve positioner 1.For observing tested valve door holder 1
Output is to the atmospheric pressure value of the A/B air cavity of pneumatic actuator 2, at tested valve door holder output pressure to the two of pneumatic actuator 2
Gas circuit designs two air gauges 21,22.And separately design gas vent in this two gas circuit, and accessing two air circuit breakers 25, it is made
With being: after having tested, quickly the air pressure in the A/B air cavity of pneumatic actuator 2 is discharged, it is to avoid when unloading valve positioner
There is the huge sound in the release of this air pressure, blows away some gas circuits and seal finding, such as O etc..
Source of the gas the 3rd branch has entered the reverse execution device 3 of reactive torque.
The load pressure regulator valve 15 first passing through load regulation component 5 adjusts bleed pressure and obtains stable air pressure, air pressure now
Value can be read out by Pressure gauge 16, is then determined the phase entering reverse execution device 3 by two five-way hand-operated direction valves 17
Answer air cavity, so that it is determined that the reactive torque that reverse execution device 3 causes for pneumatic actuator 2.
According to the direction of motion of actual pneumatic actuator 2, determine to give the direction of reverse execution device 3 air pressure.Such as Fig. 4 institute
Show, when valve positioner 1 drives pneumatic actuator 2 to rotate counterclockwise, hand-operated direction valve 17 pull P mouth to A mouth ventilate, B mouth to
EB mouth aerofluxus, reverse execution device 3 loads clockwise.When valve positioner 1 drives pneumatic actuator 2 to turn clockwise, hands
Dynamic reversal valve 17 is pulled P mouth and is ventilated to B mouth, and A mouth counterclockwise loads to EA mouth aerofluxus, reverse execution device 3, reverse execution device
The reactive torque of 3 pairs of pneumatic actuators 2 is constant.And air pressure constant, reactive torque is constant.
As shown in Figure 6, Figure 7, for reducing the time installing tested valve door holder 1, improving production efficiency, this testing stand sets
Put a gas circuit quick assembling mechanism 6 quickly connecting tested valve door holder air-path interface.The right of tested valve door holder 1 uses one
Individual Direct Travel cylinder 19, compresses and loosens the gas contiguous block 20 that the air pressure interface with localizer is in close contact by it, reduces
Tested valve door holder 1 is installed every time and will again connect the workload of gas.
This gas circuit quick assembling mechanism 6 is main by the gas contiguous block 20 being connected with two air cavity A/B of pneumatic actuator 2,
Quick-installation bolt 27, cylinder contiguous block 29, for being switched fast the intermediate mass 28 for different size measured piece, Direct Travel cylinder 19
Form with 3-position 4-way hand-operated valve 18.Wherein Direct Travel cylinder 19 and the combined integrated use of 3-position 4-way hand-operated valve 18, i.e. pass through
3-position 4-way hand-operated valve 18 directly controls the motion mode of Direct Travel cylinder 19.
According to aforementioned source of the gas the first branch, in tested localizer installation process, if as it is shown in fig. 7, manually pulling three four
When the handle of logical hand-operated valve 18 is toward H position, the A air inlet of Direct Travel cylinder 19 piston big chamber, piston loculus B aerofluxus, air pressure promotes piston
Motion, the piston rod of Direct Travel cylinder 19 promotes gas contiguous block 20 to compress tested valve door holder 1, two of valve positioner 1
Air pressure interface is connected with two air cavity A/B of pneumatic actuator 2 respectively by gas contiguous block 20.If manually pulling 3-position 4-way hands
When the handle of dynamic valve 18 is toward Q position, Direct Travel cylinder 19 piston loculus B air inlet, the A aerofluxus of piston big chamber, air pressure promotes piston reverses direction
Motion, the piston rod of Direct Travel cylinder 19 pulls gas contiguous block 20 to depart from tested valve door holder 1.
Owing to tested valve door holder has band Pressure gauge assembly and the specification without Pressure gauge assembly, therefore by whether install additional
The intermediate mass 28 of quick assembling mechanism 6, i.e. can be used to calibration tape Pressure gauge assembly and the specification valve positioner without Pressure gauge assembly
1.Concrete operations are: if tested localizer is without Pressure gauge assembly, then this quick assembling mechanism is installed as shown in Figure 6, Figure 7.If
Tested localizer band Pressure gauge assembly, the most first extracts Quick-installation bolt 27, then is taken out by intermediate mass 28, then directly by cylinder even
Connect block 29 to insert in gas contiguous block 20 pilot hole, then lock, as shown in Figure 8 and Figure 9 with a Quick-installation bolt 27.
Due to the existence of manufacturing and fixing error, the resetting shaft of tested valve door holder 1 and the rotary shaft of pneumatic actuator 2
Between have fit clearance, then will necessarily produce test return difference.Return difference hour, does not have the biggest problem, very during stand-alone debugging
To being not discovered.When reaching one, two percentage points, just it is very easy to find at valve wide open closed positions, shows as, actual valve
Position has arrived at but value of feedback but shows the most far short of what is expected.Such as it is found problems when debugging, should process in time, once throw
Enter to run, during onsite application, in the workshop section that technological requirement is higher, oscillatory occurences easily occurs.
Given this phenomenon, testing stand arranges just like the elimination return difference mechanism 26 shown in Figure 10, Figure 11, Figure 12, is used for eliminating
The return difference produced in test process.In tested valve door holder 1 installation process, the resetting shaft of localizer 1 is by eliminating return difference machine
Structure 26 is connected with the rotary shaft of pneumatic actuator 2.During installation, first will eliminate the locating shaft base 31 of return difference mechanism with a screw 30
It is fixed on the top of the rotary shaft of pneumatic actuator 2, then with 2 alignment pins 32, spacing locating shaft 33 is installed at the bottom of locating shaft
On seat 31.2 alignment pins 32 all have close-fitting requirement with locating shaft base 31 and spacing locating shaft 33, locating shaft base of ascending the throne
31 can not have gap and relative rotation after the installation of spacing locating shaft 33.
The action principle of return difference mechanism 26 is: the resetting shaft of tested valve door holder 1 inserts spacing locating shaft 33 top
In circular hole, acting on the lower end of compact heap 34 by the elastic force of stage clip 35, the upper end of compact heap 34 compresses tested valve location
The resetting shaft of device 1.Therefore i.e. without rotating against between resetting shaft and the spacing locating shaft 33 of tested valve door holder in test process,
Test return difference is eliminated.
The power supply of valve positioner 1 and signal feeding, signal feedback are controlled by the detection case 7 of testing stand upper left side and show
Show.Detection case 7 is mainly made up of a signal source, and the electric control signal of the exportable 4-20mA of this signal source is used for controlling tested valve
The location of door holder 1, meanwhile, the actual position value that controlled valve feeds back is believed by the output of tested valve door holder 1
Number also show on this detection case 7.Figure 13 is the tested valve door holder 1 that the detection case 7 with the embodiment of the present invention is connected
The logic block-diagram of control circuit.
A, the operation principle of tested valve door holder 1
As shown in figure 14, intelligent valve positioner 1 operation principle is to compare set-point and controlled by Micro-processor MCV
The actual value that valve feeds back, and utilize deviation signal to control to enter the air inflow of pneumatic actuator air cavity, thus reach
To being accurately positioned.
Micro-processor MCV receives the set-point signal of 4-20mA, with the actual valve of the position sensor feedback of controlled valve
Place value compares, if be detected that deviation, exports an automatically controlled instruction to two controls according to the size and Orientation of deviation immediately
Valve processed, one of them control valve air inlet, another control valve aerofluxus, thus regulate the air mass flow entering actuator air chamber,
It is to say, control instruction is converted into pneumatic displacement increment by control valve.(the height when actual valve position and setting value deviation are the biggest
Speed district), valve positioner 1 exports a continuous signal, controls its electric conversion module and inflates toward executor's air cavity continuously or put
Gas, makes valve position quickly near setting value；As deviation is little (low regime), valve positioner 1 is by output pulse signal；When deviation very
Hour (self adaptation or adjustable dead band state), then do not have framing signal to export, and now, actual controlled valve arrives setting value, machine
Structure reaches poised state, the corresponding certain valve location of the most certain setting value electric current.
Even if valve positioner testing stand is installed controlled valve and also is difficult to arrange such as on-the-spot various pipeline flows, institute
As long as typically to simulate controlled valve to the moment used by an off under various flow effects.
In order to simulate real work situation, valve flow load selects a miniature pneumatic executor reversely to install, its machine
The rotary shaft of tool outfan uses as mechanical input, referred to as reverse execution device 3, also gives a stable air pressure, as
The load of pneumatic actuator 2.Because may there be difference, mould the time that pneumatic actuator 2 bringing onto load runs with the no-load running time
Intend real work situation and be more beneficial for testing hysteresis and the susceptiveness of product.
When test, give tested localizer 1 accurate according to the logic block-diagram of Figure 13 tested valve door holder 1 control circuit
Connect wire, and to the logical upper source of the gas of testing stand, the signal source of regulation detection case 7 gets final product the function of simulation test valve positioner 1.
B, valve positioner 1 Function detection
Whether met by this test assessment product basic function, can normally work.
Detection project: the Shou automatic switching function of valve positioner 1, Zheng reverse function, Duan Qi signal holding function,
Warning function, self-diagnostic function.
Test procedure:
A. press valve positioner 1 hands automatically switch, audit function is the most normal.
B., after correct wiring, make valve positioner 1 total travel run, input signal 0%, 25%, 50%, 75%,
100%, carry out a circulation, observe pneumatic actuator 2 and the operation conditions of reverse execution device 3.
C. sudden shut off input signal, observe whether valve positioner 1 keeps.
D. sudden shut off source of the gas, observe whether valve positioner 1 keeps.
E. the self diagnosis flow process of valve positioner 1, the parameters of record self diagnosis are run.
F. run valve positioner 1 self-defined valve characteristic curve function time, by curve mistake be defined as non-monotonic
Rise decline, observe the most correct display alarm of valve positioner 1.
When g. initializing, by parameter error be arranged to prescribed limit outside, observe valve positioner 1 the most correctly show
Report to the police.
H., during input ＞ 100% or ＜-10% signal, the most correct display alarm of valve positioner 1 is observed.
I. make valve positioner 1 stall when not arriving appointment position, observe valve positioner 1 and the most correctly show report
Alert.
Note: a be hands automatic functional testing；B be positive reverse function test；C-d for die break signal keep function survey
Examination；E is self-diagnostic function test；F-i is warning function test.If valve positioner 1 does not has alarm module, do not report to the police
Functional test.
C, valve positioner 1 linearity, cardinal extremity conformity error, repeatability error detects
By regulating the signal source of detection case 7, changing input signal, the amplitude with 10% is in direction up and down extremely
Test three times, record the output signal value that each input point is corresponding less, the error amount recorded according to each testing site, computational accuracy
(repeatability error), return difference.
During experiment, input signal should approach testing site slowly by the same direction of initial change, was not allow for punching existing
As.During test, input signal should keep stable, until tested parameter stability.
D, valve positioner 1 step response test
The signal source of regulation detection case 7, applies a series of Spline smoothing signal in the input of valve positioner 1, with
Compared by the response time of electricity testing device.
E, valve positioner 1 input signal cross range detection
A. will be adjusted to 28mA by valve positioner 1 input signal, for time 1min, observe valve positioner 1 overburden shape
State.
B. return to the 50% of input range, after stablizing 5min, measure exporting change amount.
C. input signal is adjusted to zero, repeats above-mentioned test, measure exporting change amount.
The functional parameter of the test bed embodiment of valve positioner of the present invention:
1. basic function
A, detection valve positioner various functions parameter
B, the detection valve positioner linearity, cardinal extremity conformity error, repeatability error
C, detection valve positioner step response
Scope test crossed by D, valve positioner
2. specifications parameter
| Overall dimensions | 700W × 300D × 400H (without detection case) |
| Detection case size | 235W×165D×160H |
| Air pressure range | 0～7Bar |
| Gas source connector | G1/4 |
| Use voltage | 220VAC |
| Control mode | Local operation controls |
Corresponding to the rotary angle stroke double-acting pneumatic actuator originally tested valve door holder that the present invention uses
The controlled object of configuration, is that any valve positioner manufacturer is as standard articles essential to Simulation field test.
Use the adjustable constant load of conduct of a small size double acting pneumatic actuator, the energy and tested mechanism controls
Object identical, it is not necessary to another oil (gas) filling device.Standardized product, moderate, design and installation is convenient, and compact conformation is suitable for 90 °
The perfect load mode that rotary test uses.
The key point of the present invention is to utilize double acting pneumatic actuator moment of torsion during whole execution to keep constant
Specific, as the constant load in process of the test, by adjusting bleed pressure, it is achieved load change.
Rotary angle stroke double-acting pneumatic actuator, is the conventional products in pneumatic actuator, and this testing stand is to gas
The reverse utilization of dynamic executor's operation principle, double pneumatic actuator superpositions use, and technology is single, uses more convenient.
Claims (9)
1. air pressure-loading valve positioner testing stand, is characterized in that, including: matching used very with tested valve door holder (1)
Real controlling organization pneumatic actuator (2), the air pressure-loading simulating controlled valve operating mode being connected with pneumatic actuator (2) outfan
System, provides the test regulation component (4) of measuring air pressure, is connected with tested valve door holder (1) to tested valve door holder (1)
Detection case (7)；Described testing stand is additionally provided with the air cavity for quickly connecting pneumatic actuator (2) and tested valve door holder
(1) the gas circuit quick assembling mechanism (6) of air-path interface；
Described air pressure loading system includes: the reverse execution device (3) being rotationally connected with pneumatic actuator (2) outfan, gives reversely
Executor (3) provides the load regulation component (5) loading air pressure；
Adjust the output pressure of load regulation component (5), change the size of the reactive torque of reverse execution device (3), it is achieved effect
The change of the load on pneumatic actuator (2) outfan；
Adjusting the output pressure of test regulation component (4), when simulating the real work of tested valve door holder (1), scene is for vaporous
The change of state.
2. testing stand as claimed in claim 1, is characterized in that: described reverse execution device (3) is that rotary shaft inputs as machinery
End is connected with the rotary shaft of the outfan of pneumatic actuator (2), air cavity is connected with pneumatic supply, its rotary shaft is to pneumatic execution
The rotary shaft of device (2) applies reactive torque, the small-sized executor reversely used.
3. testing stand as claimed in claim 2, is characterized in that: described pneumatic actuator (2) is double-acting type, and tested valve is fixed
Two air pressure interfaces of position device (1) are connected with two air cavitys of pneumatic actuator (2) respectively.
4. testing stand as claimed in claim 3, is characterized in that: described test regulation component (4) is input and compressed gas source
Three cross gas circuits that connection, outfan are connected with the air pressure input port of tested valve door holder (1), including: low pressure regulating pressure valve
And the low pressure gas circuit connected of low tension switch (9), the middle pressure gas channel that middle pressure pressure regulator valve (12) and Medium voltage switch or circuit breaker (11) are connected, pressure (10)
The high-pressure gas circuit that contracting source of the gas and high-voltage switch gear (13) lead directly to；
By selecting different gas circuit respectively, three kinds of source of the gas pressures for gaseity of simulation tested valve door holder (1) working site
Power.
5. testing stand as claimed in claim 3, is characterized in that: described reverse execution device (3) is double-acting type, reverse execution device
(3) two air cavitys are connected with two the air pressure interfaces loading regulation component (5) respectively.
6. testing stand as claimed in claim 5, is characterized in that: described load regulation component (5) is input and compressed gas source
The pressure regulation commutation gas circuit that connection, load pressure regulator valve (15) and reversal valve (17) are connected；
The outbound course of switching reversal valve (17), it is achieved the conversion of the reactive torque of reverse execution device (3), dummy activity is pneumatic
Two-way load in executor (2) rotary shaft.
7. testing stand as claimed in claim 3, is characterized in that: described gas circuit quick assembling mechanism (6) including: connect tested valve fixed
The gas contiguous block (20) of the air-path interface of position device (1), promotes the Direct Travel cylinder (19) of gas contiguous block (20), controls Direct Travel gas
The reversal valve (18) of cylinder (19).
8. testing stand as claimed in claim 3, is characterized in that: described testing stand is additionally provided with for eliminating in test process,
The elimination return difference mechanism in gap is turned round between resetting shaft and the rotary shaft of pneumatic actuator (2) of tested valve door holder (1)
(26)。
9. testing stand as claimed in claim 8, is characterized in that: described elimination return difference mechanism (26) including: fixed with tested valve
The spacing locating shaft (33) that the resetting shaft of position device (1) quickly connects, compresses the compact heap (34) of resetting shaft, executes to compact heap (34)
The stage clip (35) of pressure, is fixed on the locating shaft base (31) of the rotary shaft upper end of pneumatic actuator (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110027553.2A CN102607822B (en) | 2011-01-25 | 2011-01-25 | Air pressure-loading valve positioner testing stand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110027553.2A CN102607822B (en) | 2011-01-25 | 2011-01-25 | Air pressure-loading valve positioner testing stand |
Publications (2)
| Publication Number | Publication Date |
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| CN102607822A CN102607822A (en) | 2012-07-25 |
| CN102607822B true CN102607822B (en) | 2016-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110027553.2A Expired - Fee Related CN102607822B (en) | 2011-01-25 | 2011-01-25 | Air pressure-loading valve positioner testing stand |
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| CN (1) | CN102607822B (en) |
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| CN103698141B (en) * | 2012-09-28 | 2016-06-01 | 宝山钢铁股份有限公司 | A kind of multi-component locator offline correction device |
| CN103411784B (en) * | 2013-08-05 | 2015-09-09 | 浙江省泵阀产品质量检验中心 | The proving installation of linear valve pneumatic actuator |
| CN103471836B (en) * | 2013-09-22 | 2016-04-06 | 浙江博恩自控阀门有限公司 | A kind of fatigue strength tester of simulation torque |
| CN104236882B (en) * | 2014-08-28 | 2017-02-15 | 山东景陆工业控制系统有限公司 | Intelligent valve locator tester |
| CN107152550B (en) * | 2017-04-20 | 2023-08-29 | 天津诺科流体控制设备有限公司 | Gas signal information feedback method and gas signal feedback system of valve pneumatic actuator |
| CN108195574B (en) * | 2017-12-27 | 2019-12-10 | 浙江工业大学 | control valve position abnormal oscillation experimental method |
| CN109916645B (en) * | 2019-01-16 | 2023-12-19 | 中铁第四勘察设计院集团有限公司 | Vertical clamping mechanism and wind pressure test device of tunnel protection door |
| CN109738173B (en) * | 2019-02-02 | 2024-02-20 | 天津中阀科技有限公司 | Multifunctional performance testing device |
| CN112796874B (en) * | 2019-11-14 | 2022-03-15 | 湖南天雁机械有限责任公司 | Stepless pressure regulating method for turbocharger actuator |
| CN112164953B (en) * | 2020-09-14 | 2022-04-12 | 四川航天燎原科技有限公司 | Crimping locator |
| CN112945542A (en) * | 2021-02-04 | 2021-06-11 | 杭州电子科技大学 | Pneumatic valve characteristic parameter detection device and method based on intelligent positioner |
| CN113188695B (en) * | 2021-03-31 | 2023-02-03 | 江苏兰菱机电科技有限公司 | Dynamometer machine for large-torque pneumatic actuator |
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