CN102607822A - Air pressure loading valve positioner test bed - Google Patents
Air pressure loading valve positioner test bed Download PDFInfo
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- CN102607822A CN102607822A CN2011100275532A CN201110027553A CN102607822A CN 102607822 A CN102607822 A CN 102607822A CN 2011100275532 A CN2011100275532 A CN 2011100275532A CN 201110027553 A CN201110027553 A CN 201110027553A CN 102607822 A CN102607822 A CN 102607822A
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Abstract
The invention discloses an air pressure loading valve positioner test bed which comprises a vacuum control mechanism pneumatic executer, an air pressure loading system, a test pressure regulation component and a detection box, wherein the vacuum control mechanism pneumatic executer is matched with a tested valve positioner; the air pressure loading system is connected with an output end of the pneumatic executer and used for stimulating the working conditions of the controlled valve; the test pressure regulation component provides the test air pressure to the tested valve positioner; and the detection box is connected with the valve positioner. The air pressure loading system comprises a reverse executer and a load pressure regulation component, wherein the reverse executer is rotatably connected with the output end of the pneumatic executer; and the load pressure regulation component provides the loaded air pressure to the reverse executer. By adjusting the output pressure of the load pressure regulation component, the reverse torque of the reverse executer can be changed, and the change of the load acting on the output end of the pneumatic executer is realized. The air pressure loading valve positioner test bed disclosed by the invention has the advantages that: the air pressure loading system composed of reversely-used small executers is used for stimulating the working conditions of the load of the valve controlled on the site, so that the test conditions of the valve positioner are more close to the really-used actual environment.
Description
Technical field
The present invention relates to the checkout equipment technical field, especially relate to the air pressure-loading testing table that detects valve positioner.
Be applicable to the testing equipment of valve positioner manufacturer, be particularly suitable for the test of the steady arm of rotary angle stroke as simulated field.Can be applicable to be no more than the actuator load test of 90 ° of rotations.
Background technology
Existing load test stand generally adopts friction force as load, no matter be electromagnetism magnetic load, hydraulic pressure dish formula disc type friction-loaded all is that friction force is as test load.
It is higher that existing load test stand is totally purchased valency, and load all is that to adopt all be the braking equipment of specialty, generally needs to be equipped with in addition power source, like electromagnetism, hydraulic pressure etc.
With interior exercise test, electromagnetism is for low speed load poor controllability for low 90 ° of movement velocity, and the hydraulic load stage body is long-pending bigger, and needs the additional liquid pressurized equipment.
And no matter still to be hydraulic load is applicable to the test of many circle rotate-stationary modes to electromagnetism usually, in 1/4 circle scope, carries out load friction for this, can cause monolateral stressedly, and the load device wearing and tearing are uneven, damage and quicken.
No matter test board on the market uses hydraulic loaded still is the mode that electromagnetism/magnetic loads, and need purchase load device in addition, is equipped with the energy, bulky, and price is high, is fit to be applied to the testing of equipment of many circle rotations.
Summary of the invention
In order to overcome the defective of above-mentioned prior art, the present invention provides a kind of air pressure-loading valve positioner testing table.
The present invention is to rely on following technical proposals to realize for solving the problems of the technologies described above:
Air pressure-loading valve positioner testing table; Comprise: with the matching used true control gear pneumatic actuator of tested valve door holder; The air pressure-loading system of the controlled valve operating mode of simulation that is connected with the pneumatic actuator output terminal; The test pressure regulation assembly of measuring air pressure being provided for the tested valve door holder, the detection case that is connected with valve positioner.Said air pressure-loading system comprises: with the reverse actuator that the pneumatic actuator output terminal is rotationally connected, the load pressure regulation assembly that loads air pressure is provided for reverse actuator.Adjust the output pressure of load pressure regulation assembly, can change the size of the reactive torque of reverse actuator, realize acting on the variation of the load on the pneumatic actuator output terminal.The variation of on-the-spot air feed state when the output pressure of adjustment test pressure regulation assembly, the real work of analog valve door holder.
Said reverse actuator is that turning axle is connected as the turning axle of mechanical input end with the output terminal of pneumatic actuator, and an air cavity is connected with pneumatic supply, and its turning axle applies reactive torque to the turning axle of pneumatic actuator, the reverse small-sized actuator that uses.
Said pneumatic actuator is a double-acting type, and two air pressure interfaces of tested valve door holder (1) are connected with two air cavitys of pneumatic actuator respectively.
Said test pressure regulation assembly is that input end is connected with compressed gas source; Three parallelly connected gas circuits that output terminal is connected with the air pressure input port of tested steady arm; Comprise: the low pressure gas circuit of low pressure regulating pressure valve and low tension switch series connection; Middle middle pressure gas channel of pressing pressure regulator valve and Medium voltage switch or circuit breaker series connection, the high-pressure gas circuit that compressed gas source and high-voltage switch gear are straight-through.Through selecting different gas circuits respectively, the bleed pressure of three kinds of air feed states that analog operation is on-the-spot.
Said reverse actuator is a double-acting type, and two air cavitys of reverse actuator are connected with two air pressure interfaces of load pressure regulation assembly respectively.Said load pressure regulation assembly is that input end is connected with compressed gas source, the pressure regulation switching-over gas circuit of load pressure regulator valve and reversal valve series connection.Switch the outbound course of reversal valve, realize the conversion of the reactive torque of reverse actuator, the two-way load of dummy activity on the pneumatic actuator turning axle.
Said testing table also is provided with the fast mounting mechanism of gas circuit of the air pressure interface of the air cavity that is used for connecting fast pneumatic actuator 2 and tested steady arm.The fast mounting mechanism of said gas circuit comprises: connect the gas contiguous block of the air pressure interface of steady arm, promote the Direct Travel cylinder of gas contiguous block, the reversal valve of control Direct Travel cylinder.
Said testing table also is provided with and is used for eliminating test process, the elimination return difference mechanism in revolution gap between the resetting shaft of tested valve door holder and the turning axle of pneumatic actuator.Said elimination return difference mechanism comprises: with the spacing locating shaft that the resetting shaft of steady arm is connected fast, compress the compact heap of resetting shaft, to the stage clip that compact heap is exerted pressure, be fixed on the locating shaft base on the turning axle of pneumatic actuator.
Adopt the advantage of technical scheme of the present invention to be:
1. pneumatic actuator 2 is as the control object of tested valve door holder 1; It is the true object of actual use; Reverse actuator 3 is connected with pneumatic actuator 2 output terminals; The load behavior that is used for the controlled valve of simulated field makes the test condition of valve positioner more near its true actual environment that uses.
2. the air pressure-loading system that reverse actuator 3 constitutes, the load of simulation pneumatic actuator 2 can keep load constant in whole test process after the source of the gas adjustment, and load mode is simple.
3. the energy of two double acting pneumatic actuators and tested steady arm is general, and it is single that the key of testing table constitutes object, and pneumatic actuator is as standardized product, and object is bought convenient.
4. fast mounting mechanism is convenient to before and after the test, and when loading and unloading tested steady arm 1, the air pressure interface of tested steady arm can be connected to the air cavity of pneumatic actuator 2 fast.
5. the revolution gap between the turning axle of resetting shaft and pneumatic actuator of tested steady arm can be eliminated by return difference mechanism, when also helping the tested steady arm of loading and unloading, and the quick connection between resetting shaft and the turning axle.
Description of drawings
Fig. 1 and Fig. 2 are the structure principle chart of the double acting pneumatic actuator of testing table use of the present invention.
Fig. 3 is the system chart of air pressure-loading valve positioner testing table of the present invention.
Fig. 4 is the pneumatic schematic diagram of the embodiment of the invention.
Fig. 5 is the mounting structure synoptic diagram of embodiment of the invention valve positioner testing table.
Fig. 6 is the gas circuit fast-assembling structural scheme of mechanism of the embodiment of the invention.
Fig. 7 is the vertical view of Fig. 6.
Fig. 8 is another gas circuit fast-assembling structural scheme of mechanism of the embodiment of the invention.
Fig. 9 is the vertical view of Fig. 8.
Figure 10 is the cut-open view of the elimination return difference mechanism of the embodiment of the invention.
Figure 11 is the left view of the elimination return difference mechanism of the embodiment of the invention.
Figure 12 is the vertical view of the elimination return difference mechanism of the embodiment of the invention.
Figure 13 is the logic block-diagram of the tested valve door holder control circuit that is connected with the detection case 7 of the embodiment of the invention.
Figure 14 is a measured object of the present invention, and intelligent valve positioner connects the fundamental diagram of pneumatic actuator and controlled valve.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated.
The present invention utilizes the air pressure-loading valve positioner testing table of two rotary angle stroke double acting pneumatic actuators as double acting intelligent valve positioner 1 test load.
This testing table comprise one with tested intelligent valve positioner 1 true supporting control gear pneumatic actuator 2; The air pressure-loading system that the small-sized actuator of the reverse use of a controlled valve load of simulation constitutes; The fast mounting mechanism of gas circuit that also comprises the air-path interface of an air cavity that is used for connecting fast pneumatic actuator 2 and tested valve door holder 1, an elimination return difference mechanism that is used to eliminate revolution gap between tested valve door holder and the pneumatic actuator.
Structure such as Fig. 1, shown in Figure 2 of rotary angle stroke double acting pneumatic actuator; Its principle is; Pressure reduction between cylinder two-chamber A/B promotes piston, and the moment of torsion output of the turning axle that thrust is become through the rack pinion transmission, and then drives valve and carry out corresponding spinning movement.Fig. 1 representes rotation counterclockwise, and pressurized air makes the direction motion laterally of left and right sides piston by A mouth input entering center, and turning axle counterclockwise rotates, and the air in the two-piston outside is discharged by the B mouth; Fig. 2 representes the CW rotation, and pressurized air gets into both sides by the input of B mouth, and left and right sides piston is moved to the center, the rotation of turning axle CW, and the air in the middle of the two-piston is discharged by the A mouth.
The mounting structure of testing table is as shown in Figure 5.Tested valve door holder 1 is placed on the sheet metal structural support 23, and support is fastened on the pneumatic actuator 2 with screw.Select the rotary angle stroke pneumatic actuator 2 and 1 supporting connection of valve positioner of cylinder diameter 210mm for use; The resetting shaft of tested valve door holder 1 bottom is connected with the upper end of the output rotating shaft of rotary angle stroke pneumatic actuator 2, is noted that the turning axle that will guarantee pneumatic actuator 2 is concentric with the resetting shaft of valve positioner 1.
Be the various pipeline flows of the controlled valve of simulated field, selecting another cylinder diameter for use is that the rotary angle stroke pneumatic actuator of 105mm oppositely uses, and constitutes reverse actuator 3.The turning axle of reverse actuator is connected with the lower end of the output rotating shaft of the pneumatic actuator 2 of tested valve door holder 1 control; Adjustable loading air pressure is provided for the air cavity of reverse actuator; Be used for the various pipeline flows of the controlled valve of simulated field, the mechanical load of pneumatic actuator 2 during as test.One of the double acting pneumatic actuator very important characteristic be, under the constant air pressure in the whole rotary course moment of torsion keep constant.So the demand of test is satisfied in this load just.
As shown in Figure 5, the square tube that uses 100 * 100 is done Change-over frame 24 in echelon, and reverse actuator 3 is inverted in the lifting testing tables, be positioned at pneumatic actuator 2 under.There is an anistree counterbore bottom of the turning axle of pneumatic actuator, is fit to place foursquare axle, can put into for 45 ° at the interval.The anistree counterbore of the turning axle upper end of reverse actuator 3 is over against the anistree counterbore of the turning axle bottom of pneumatic actuator 2.Make foursquare gap bridge axle, the turning axle of two pneumatic actuators is coupled together, notice guaranteeing that two pneumatic actuator turning axles are concentric.
When the turning axle of pneumatic actuator 2 rotated motion, the turning axle that will drive reverse actuator 3 rotated together.Feed constant air pressure at this moment for the corresponding air cavity of reverse actuator 3, cause constant reactive torque, just formed the constant load of process of the test to rotation.
The system chart of testing table is as shown in Figure 3; Regulate the signal source (4～20mA) of detection case; Tested valve door holder 1 will be according to the deviation size and Orientation of the set-point of the actual value of pneumatic actuator 2 turning axle corners and detection case output; The output control commands corresponding promptly is converted into the electric conversion module that the tested valve of gas signal controlling is located by the control electric signal, and drives air inlet or the exhaust of pneumatic actuator 2 two-chamber A/B by electric conversion module output gas signal.And according to the mechanical location of pneumatic actuator 2 feedback, the air inlet of given pneumatic actuator 2 two-chambers of tested valve door holder 1 control.Pneumatic actuator 2 since in the body two-chamber A/B get into the pressure reduction of gas, make it carry out clockwise or be rotated counterclockwise motion.
In the input air pressure path, test pressure regulation assembly 4 is connected before the double-purpose valve door holder 1, the situation when playing the various air pressure of simulated field, and common 0.4～7Bar is adjustable.Load pressure regulation assembly 5 is connected before the reverse actuator 3, plays the effect of the size and Orientation of the reactive torque of regulating reverse actuator 3.
Shown in the pneumatic schematic diagram of Fig. 4 embodiment; Source of the gas inserts testing table from 2/2-way manual ball valve 8; Divide then three the tunnel be supplied to the fast mounting mechanism 6 of gas circuit respectively Direct Travel cylinder 19, the reverse actuator 3 of the tested valve door holder 1 and the air pressure-loading system of the controlled valve operating mode of simulation.
Source of the gas first gets into Direct Travel cylinder 19 through a 3-position 4-way hand valve 18 along separate routes.The air intake opening P of 3-position 4-way hand valve 18 can link to each other with two plunger shaft of Direct Travel cylinder 19 respectively in two states switchings.
When 3-position 4-way hand valve 18 is connected the P-A path, the A air inlet of the big chamber of the piston of Direct Travel cylinder 19, air pressure promotes piston advances forward, and the piston loculus B of Direct Travel cylinder 19 passes through the B-R path of 3-position 4-way hand valve 18 connections to extraneous exhaust; When 3-position 4-way hand valve 18 is connected the P-B path, the piston loculus B air inlet of Direct Travel cylinder 19, air pressure promotes piston and moves backward, and the big chamber A of the piston of Direct Travel cylinder 19 passes through the A-R path of 3-position 4-way hand valve 18 connections to extraneous exhaust.
Piston rod front end at Direct Travel cylinder 19 connects a gas contiguous block 20; In the test job; Through controlling 3-position 4-way hand valve 18, Direct Travel cylinder 19 just can promote and retract gas contiguous block 20 fast, makes the contiguous block 20 of bringing about the desired sensation be connected and separate fast with pressing of tested valve door holder 1; Reduce install before the test tested valve door holder 1 and workload, also reduce each workload that tested valve door holder 1 all will connect gas circuit again of installing.
Source of the gas second gets into double-purpose valve door holder 1 along separate routes.
Shown in Fig. 4 pneumatic schematic diagram, source of the gas was introduced into the input end of pressure regulation assembly 4 before supplying with tested valve door holder 1, and the output terminal of pressure regulation assembly 4 is connected with the air pressure input port of tested valve door holder 1.Three gas circuits of pressure regulation assembly 4 parallel connection are respectively the low pressure gas circuit of low pressure regulating pressure valve 10 and low tension switch 9 series connection, the high-pressure gas circuit that the middle pressure gas channel of middle pressure pressure regulator valve 12 and Medium voltage switch or circuit breaker 11 series connection, source of the gas and high-voltage switch gear 13 lead directly to.Three baroswitches through on three gas circuits are selected suitable test air pressure.
Test air pressure is introduced into tested valve door holder 1, and valve positioner 1 control gets into the air pressure of 2 two air cavity A/B of pneumatic actuator.Valve positioner 1 makes pneumatic actuator 2 be positioned at a given position through detecting the machine feedback of pneumatic actuator 2.
Three kinds of time length differences that different test air pressure plays to make pneumatic actuator move to anchor point can be observed hysteresis and sensitivity that 1 pair of control of valve positioner and feedback signal are gathered.
In order to improve the testing efficiency of testing table, testing table has designed several pressure, and low pressure, medium and high pressure are set as 2Bar respectively, 4Bar and total head (7Bar).Though this function can be switched through given electric signal by a current to pneumatic converter easily, and can obtain each little variable quantity air pressure.But the price of a common electric converter is greater than 10 common reduction valve; And actual test does not need diversified air pressure; So design as long as consider low pressure, middle pressure, high pressure that simulated field possibly occur; And under high-pressure situations, do not need to add again reduction valve, lead directly to just.In basic, normal, high pressure gas channel, load onto air circuit breaker respectively, can open or close respectively as required.
In order to discern the air pressure of actual arrival tested valve door holder 1, we have installed additional in the gas circuit of a tensimeter 14 before tested steady arm, conveniently read the actual pressure value.
1 two air pressure interfaces of tested valve door holder connect the filling, exit of two air cavity A/B air pressure of pneumatic actuator 2 respectively, the pressure of two air cavity A/B through valve positioner 1 control pneumatic actuator 2.For observing the atmospheric pressure value that tested valve door holder 1 outputs to the A/B air cavity of pneumatic actuator 2, two rain glasss 21,22 of design in two gas circuits of tested valve door holder output pressure to pneumatic actuator 2.And design relief port respectively in this two gas circuit; Insert two air circuit breakers 25; Its effect is: after testing completion, fast the air pressure in the A/B air cavity of pneumatic actuator 2 is discharged, avoid the huge sound of this air pressure release generation when unloading valve positioner; Blow away some gas circuits sealing findings, like O type circle etc.
Source of the gas the 3rd has got into the reverse actuator 3 of reactive torque along separate routes.
Load pressure regulator valve 15 adjustment bleed pressures through overload pressure regulation assembly 5 obtain stablizing air pressure earlier; The atmospheric pressure value of this moment can read out through tensimeter 16; Confirm to get into the corresponding air cavity of reverse actuator 3 then through two five-way hand-operated direction valves 17, thereby confirm the reactive torque that reverse actuator 3 causes for pneumatic actuator 2.
According to the direction of motion of actual pneumatic actuator 2, decision gives the direction of reverse actuator 3 air pressure.As shown in Figure 4, when valve positioner 1 driving pneumatic actuator 2 was rotated counterclockwise, hand-operated direction valve 17 was pulled the P mouth to the ventilation of A mouth, and the B mouth is to the exhaust of EB mouth, and reverse actuator 3 CWs load.When valve positioner 1 driving pneumatic actuator 2 turned clockwise, hand-operated direction valve 17 was pulled the P mouth to the ventilation of B mouth, and the A mouth is to the exhaust of EA mouth, and reverse actuator 3 counterclockwise loads, and oppositely the reactive torque of 3 pairs of pneumatic actuators 2 of actuator is constant.And air pressure is constant, and reactive torque is constant.
Like Fig. 6, shown in Figure 7, for reducing the time that tested valve door holder 1 is installed, to enhance productivity, this testing table is provided with a quick fast mounting mechanism 6 of gas circuit that connects tested valve door holder air-path interface.A Direct Travel cylinder 19 is used on the right of tested valve door holder 1, compresses and loosens the gas contiguous block 20 that closely contact with the air pressure interface of steady arm through it, reduces the workload that each installation tested valve door holder 1 all will connect gas again.
The fast mounting mechanism of this gas circuit 6 is main by the gas contiguous block 20 that has been connected with two air cavity A/B of pneumatic actuator 2; Fast-assembling latch 27; Cylinder contiguous block 29 is used for switching fast the intermediate mass 28 to the different size measured piece, and Direct Travel cylinder 19 is formed with 3-position 4-way hand valve 18.Wherein Direct Travel cylinder 19 and the 18 combined integrated uses of 3-position 4-way hand valve promptly pass through the mode of motion that 3-position 4-way hand valve 18 is directly controlled Direct Travel cylinder 19.
According to aforementioned source of the gas first along separate routes, in the tested steady arm installation process, as shown in Figure 7; If the artificial handle of pulling 3-position 4-way hand valve 18 is during toward the H position; The A air inlet of the big chamber of Direct Travel cylinder 19 pistons, piston loculus B exhaust, air pressure promotes piston motion; The piston rod of Direct Travel cylinder 19 promotes gas contiguous block 20 and compresses tested valve door holder 1, and two air pressure interfaces of valve positioner 1 are connected with two air cavity A/B of pneumatic actuator 2 respectively through gas contiguous block 20.If the artificial handle of pulling 3-position 4-way hand valve 18 is during toward the Q position, the 19 piston loculus B air inlets of Direct Travel cylinder, the A exhaust of the big chamber of piston, air pressure promotes the piston reverses direction motion, and the piston rod pulling gas contiguous block 20 of Direct Travel cylinder 19 breaks away from tested valve door holders 1.
Because the tested valve door holder has band tensimeter assembly and is not with the specification of tensimeter assembly, so, promptly can be used to calibration tape tensimeter assembly and be not with the specification valve positioner 1 of tensimeter assembly through whether installing the intermediate mass 28 of fast mounting mechanism 6 additional.Concrete operations are: be not with the tensimeter assembly as if tested steady arm, then this fast mounting mechanism such as Fig. 6, the shown in Figure 7 installation.If tested steady arm band tensimeter assembly is then earlier extracted fast-assembling latch 27, again intermediate mass 28 is taken out, then directly cylinder contiguous block 29 is inserted in gas contiguous block 20 pilot holes, lock with a fast-assembling latch 27 again, like Fig. 8 and shown in Figure 9.
Because the existence of manufacturing and alignment error has tolerance clearance between the turning axle of the resetting shaft of tested valve door holder 1 and pneumatic actuator 2, then will inevitably produce the test return difference.Return difference hour does not have too big problem during stand-alone debugging, even can not realized.When reaching one, two percentage point, just be very easy to find in valve wide open complete shut-down position, show as, actual valve position has arrived but value of feedback but shows also far short of what is expected.When debugging,, should in time handle,, in the on-the-spot use,, oscillatory occurences very easily occur in the higher workshop section of technological requirement in case put into operation if any this type of problem of discovery.
Given this phenomenon, testing table are provided with like Figure 10, Figure 11, elimination return difference mechanism 26 shown in Figure 12, are used for eliminating the return difference that test process produces.In tested valve door holder 1 installation process, the resetting shaft of steady arm 1 is connected with the turning axle of pneumatic actuator 2 through eliminating return difference mechanism 26.During installation, the locating shaft base 31 that earlier will eliminate return difference mechanism with a screw 30 is fixed on the top of the turning axle of pneumatic actuator 2, then with 2 register pins 32 spacing locating shaft 33 is installed on the locating shaft base 31.2 register pins 32 all have the close-fitting requirement with locating shaft base 31 and spacing locating shaft 33, the rotation that the locating shaft base 31 of ascending the throne can not be gapped and relative after installing with spacing locating shaft 33.
The action principle of return difference mechanism 26 is: the resetting shaft of tested valve door holder 1 inserts in the circular hole on spacing locating shaft 33 tops, and the elastic force through stage clip 35 acts on the lower end of compact heap 34, and the upper end of compact heap 34 compresses the resetting shaft of tested valve door holder 1.So promptly do not have rotation relatively in the test process between the resetting shaft of tested valve door holder and the spacing locating shaft 33, the test return difference is eliminated.
The power supply of valve positioner 1 and signal feeding, signal feedback are by detection case 7 controls and the demonstration of testing table upper left side.Detection case 7 mainly is made up of a signal source; The electric control signal of the exportable 4-20mA of this signal source; Be used to control the location of tested valve door holder 1, simultaneously, the actual position value that controlled valve feeds back also shows on this detection case 7 through the output signal of tested valve door holder 1.Figure 13 is the logic block-diagram of tested valve door holder 1 control circuit that is connected with the detection case 7 of the embodiment of the invention.
The principle of work of A, tested valve door holder 1
Shown in figure 14, intelligent valve positioner 1 principle of work is the actual value of coming comparison set-point and controlled valve to feed back through microprocessor MCU, and utilizes deviation signal to control the air inflow that gets into the pneumatic actuator air cavity, thereby reaches accurate location.
Microprocessor MCU receives the set-point signal of 4-20mA, compares with the actual valve place value of the position sensor feedback of controlled valve, if the deviation of detecting; Give two operation valves according to automatically controlled instruction of size and Orientation output of deviation immediately; One of them operation valve air inlet, another operation valve exhaust, thus regulate the air mass flow that gets into topworks's air chamber; That is to say that operation valve converts steering order to pneumatic displacement increment.When the valve position of reality and setting value deviation are very big (high velocity), continuous signal of valve positioner 1 output is controlled its electric conversion module continuously toward inflation of actuator air cavity or venting, makes valve position fast near setting value; Like deviation little (low regime), valve positioner 1 is with output pulse signal; When deviation is very little (self-adaptation or adjustable dead band state), then there is not positioning signal output, at this moment, actual controlled valve arrives setting value, and mechanism reaches equilibrium state, the valve location that promptly certain setting value electric current is corresponding certain.
Even the valve positioner testing table is installed controlled valve and also is difficult to arrange as on-the-spot various pipeline flows, so the general controlled valve of simulation that needs only is to opening and close used moment under the various flow effects.
In order to simulate the real work situation; The valve flow load selects for use a miniature pneumatic actuator oppositely to install, and the turning axle of its mechanical output terminal uses as mechanical input end, is called reverse actuator 3; Also give a stable air pressure, as the load of pneumatic actuator 2.Because possibly there is difference the time of pneumatic actuator 2 bringing onto loads operation with the no-load running time, simulation real work situation more helps the hysteresis and the sensitivity of test products.
When testing, accurately connect lead for tested steady arm 1 according to the logic block-diagram of Figure 13 tested valve door holder 1 control circuit, and to the logical source of the gas of going up of testing table, the signal source of regulating detection case 7 get final product the function of simulation test valve positioner 1.
B, valve positioner 1 Function detection
Whether satisfy through this testing evaluation product basic function, can operate as normal.
Test item: the hand of valve positioner 1 automatic switching function, positive reverse function, die signal keep function, warning function, self-diagnostic function.
Test procedure:
A. press valve positioner 1 hand automatically switch, whether audit function normal.
B. after the correct wiring, make the operation of valve positioner 1 total travel, input signal 0%, 25%, 50%, 75%, 100% carries out a circulation, observes the operation conditions of pneumatic actuator 2 and reverse actuator 3.
C. cut off input signal suddenly, whether inspecting valve door holder 1 keeps.
D. cut off source of the gas suddenly, whether inspecting valve door holder 1 keeps.
E. move the self diagnosis flow process of valve positioner 1, the parameters of record self diagnosis.
When f. moving the self-defined valve characteristic curve function of valve positioner 1, with the non-dull rising of being defined as of curve mistake descend whether correct display alarm of inspecting valve door holder 1.
G. during initialization, with being arranged to outside the specialized range of parameter error, whether correct display alarm of inspecting valve door holder 1.
H. input＞100% or＜during-10% signal, whether correct display alarm of inspecting valve door holder 1.
I. make valve positioner 1 stall when the no show assigned address, whether correct display alarm of inspecting valve door holder 1.
Annotate: a be hand automatic functional testing; B be positive reverse function test; C-d for die break signal keep functional test; E is the self-diagnostic function test; F-i is the warning function test.If valve positioner 1 does not have alarm module then not carry out the warning function test.
C, valve positioner 1 linearity, the cardinal extremity conformity error, reproducibility error detects
Through regulating the signal source of detection case 7; Change input signal, the amplitude with 10% is upwards being tested three times with downward direction at least, writes down the corresponding output signal value of each input point; According to the error amount that each testing site records, computational accuracy (reproducibility error), return difference.
During experiment, input signal should approach the testing site slowly by the same direction of initial change, does not allow overshoot phenomenon.During test, it is stable that input signal should keep, till parameter stability to be tested.
D, valve positioner 1 step response test
Regulate the signal source of detection case 7, in the input of valve positioner 1, apply a series of step variable signal, compare with the response time of being put by trial assembly.
E, valve positioner 1 input signal overrange detect
A. will be adjusted to 28mA by valve positioner 1 input signal, for the time 1min, inspecting valve door holder 1 overburden state.
B. return to 50% of input range, stablize 5min after, measure the output variable quantity.
C. input signal is adjusted to zero, repeat above-mentioned test, measure the output variable quantity.
The functional parameter of the test bed embodiment of valve positioner of the present invention:
1. basic function
A, detection valve positioner each item functional parameter
B, the detection valve positioner linearity, cardinal extremity conformity error, reproducibility error
C, detection valve positioner step response
D, the test of valve positioner overrange
2. specifications parameter
| Physical dimension | 700W * 300D * 400H (not containing detection case) |
| The detection case size | 235W×165D×160H |
| Air pressure range | 0～7Bar |
| Gas source connector | G1/4 |
| Working voltage | 220VAC |
| Control mode | Local operation control |
The rotary angle stroke double acting pneumatic actuator that the present invention adopts was exactly the corresponding controlled object that disposes of tested valve door holder institute originally, was that essential standard object is tested as simulated field by any valve positioner manufacturer.
Use the adjustable constant load of conduct of the double acting pneumatic actuator of a trumpet, the energy is identical with the object of tested mechanism controls, does not need other oil (gas) filling device.Standardized product, moderate cost, design and installation is convenient, and compact conformation is to be suitable for the perfect load mode that 90 ° of rotary tests use.
Key point of the present invention is to utilize double acting pneumatic actuator moment of torsion in whole implementation to keep constant specific, as the constant load in the process of the test, through the adjustment bleed pressure, realizes load variations.
Rotary angle stroke double acting pneumatic actuator is the conventional products in the pneumatic actuator, and this testing table is to the reverse utilization of pneumatic actuator principle of work, and two pneumatic actuator stacks are used, and technology is single, uses more convenient.
Claims (10)
1. air pressure-loading valve positioner testing table; It is characterized in that; Comprise: with the matching used true control gear pneumatic actuator of tested valve door holder (1) (2); The air pressure-loading system of the controlled valve operating mode of simulation that is connected with pneumatic actuator (2) output terminal, the test pressure regulation assembly (4) of measuring air pressure being provided for tested valve door holder (1), the detection case (7) that is connected with valve positioner (1);
Said air pressure-loading system comprises: with the reverse actuator (3) that pneumatic actuator (2) output terminal is rotationally connected, the load pressure regulation assembly (5) that loads air pressure is provided for reverse actuator (3);
Adjust the output pressure of load pressure regulation assembly (5), change the size of the reactive torque of reverse actuator (3), realize acting on the variation of the load on pneumatic actuator (2) output terminal;
The variation of on-the-spot air feed state when the output pressure of adjustment test pressure regulation assembly (4), the real work of analog valve door holder (1).
2. testing table as claimed in claim 1; It is characterized in that: said reverse actuator (3) is connected as the turning axle of mechanical input end with the output terminal of pneumatic actuator (2) for turning axle; An air cavity is connected with pneumatic supply; Its turning axle applies reactive torque to the turning axle of pneumatic actuator (2), the reverse small-sized actuator that uses.
3. testing table as claimed in claim 2 is characterized in that: said pneumatic actuator (2) is a double-acting type, and two air pressure interfaces of tested valve door holder (1) are connected with two air cavitys of pneumatic actuator (2) respectively.
4. testing table as claimed in claim 3; It is characterized in that: said test pressure regulation assembly (4) is connected with compressed gas source for input end; Three parallelly connected gas circuits that output terminal is connected with the air pressure input port of tested steady arm (1); Comprise: the low pressure gas circuit of low pressure regulating pressure valve (10) and low tension switch (9) series connection, the middle pressure gas channel of middle pressure pressure regulator valve (12) and Medium voltage switch or circuit breaker (11) series connection, the high-pressure gas circuit that compressed gas source and high-voltage switch gear (13) are straight-through;
Through selecting different gas circuits respectively, the bleed pressure of three kinds of air feed states of analog valve door holder working site.
5. testing table as claimed in claim 3 is characterized in that: said reverse actuator (3) is a double-acting type, and two air cavitys of reverse actuator (3) are connected with two air pressure interfaces of load pressure regulation assembly (5) respectively.
6. testing table as claimed in claim 5 is characterized in that: said load pressure regulation assembly (5) is connected with compressed gas source for input end, the pressure regulation switching-over gas circuit of load pressure regulator valve (15) and reversal valve (17) series connection;
Switch the outbound course of reversal valve (17), realize the conversion of the reactive torque of reverse actuator (3), the two-way load of dummy activity on pneumatic actuator (2) turning axle.
7. testing table as claimed in claim 3 is characterized in that: said testing table also is provided with the fast mounting mechanism of gas circuit (6) of the air-path interface of the air cavity that is used for connecting fast pneumatic actuator (2) and tested steady arm (1).
8. testing table as claimed in claim 7; It is characterized in that: the fast mounting mechanism of said gas circuit (6) comprising: the gas contiguous block (20) that connects the air-path interface of steady arm (1); Promote the Direct Travel cylinder (19) of gas contiguous block (20), the reversal valve (18) of control Direct Travel cylinder (19).
9. testing table as claimed in claim 3 is characterized in that: said testing table also is provided with and is used for eliminating test process, the elimination return difference mechanism (26) in revolution gap between the turning axle of the resetting shaft of tested valve door holder (1) and pneumatic actuator (2).
10. testing table as claimed in claim 9; It is characterized in that: said elimination return difference mechanism (26) comprising: with the quick spacing locating shaft (33) that is connected of the resetting shaft of steady arm (1); Compress the compact heap (34) of resetting shaft; To the stage clip (35) that compact heap (34) is exerted pressure, be fixed on the locating shaft base (31) of the turning axle upper end of pneumatic actuator (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110027553.2A CN102607822B (en) | 2011-01-25 | 2011-01-25 | Air pressure-loading valve positioner testing stand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110027553.2A CN102607822B (en) | 2011-01-25 | 2011-01-25 | Air pressure-loading valve positioner testing stand |
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| Publication Number | Publication Date |
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| CN102607822A true CN102607822A (en) | 2012-07-25 |
| CN102607822B CN102607822B (en) | 2016-09-14 |
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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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| CN103471836A (en) * | 2013-09-22 | 2013-12-25 | 浙江博恩自控阀门有限公司 | Fatigue strength testing device of simulation torque |
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| CN107152550A (en) * | 2017-04-20 | 2017-09-12 | 张进增 | The gas signal message retransmission method and gas signal of a kind of valve used pneumatic actuator return news system |
| CN108195574A (en) * | 2017-12-27 | 2018-06-22 | 浙江工业大学 | A kind of control valve valve position concussion experimental method extremely |
| CN109738173A (en) * | 2019-02-02 | 2019-05-10 | 天津中阀科技有限公司 | Multifunctional performance test device |
| CN109916645A (en) * | 2019-01-16 | 2019-06-21 | 中铁第四勘察设计院集团有限公司 | The vertical clamping mechanism and pressure decay test device of tunnel protection door |
| CN112164953A (en) * | 2020-09-14 | 2021-01-01 | 四川航天燎原科技有限公司 | Crimping locator |
| CN112796874A (en) * | 2019-11-14 | 2021-05-14 | 湖南天雁机械有限责任公司 | Stepless pressure regulating method for turbocharger actuator |
| 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 |
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| CN103411784A (en) * | 2013-08-05 | 2013-11-27 | 浙江省泵阀产品质量检验中心 | Linear valve pneumatic actuator testing device |
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| 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 |
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| 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 |
| CN108195574A (en) * | 2017-12-27 | 2018-06-22 | 浙江工业大学 | A kind of control valve valve position concussion experimental method extremely |
| CN108195574B (en) * | 2017-12-27 | 2019-12-10 | 浙江工业大学 | control valve position abnormal oscillation experimental method |
| CN109916645A (en) * | 2019-01-16 | 2019-06-21 | 中铁第四勘察设计院集团有限公司 | The vertical clamping mechanism and pressure decay test device of tunnel protection door |
| 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 |
| CN109738173A (en) * | 2019-02-02 | 2019-05-10 | 天津中阀科技有限公司 | Multifunctional performance test device |
| 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 |
| CN112796874A (en) * | 2019-11-14 | 2021-05-14 | 湖南天雁机械有限责任公司 | Stepless pressure regulating method for turbocharger actuator |
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| 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 |
| CN113188695A (en) * | 2021-03-31 | 2021-07-30 | 江苏兰菱机电科技有限公司 | Dynamometer machine for large-torque pneumatic actuator |
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