CN204082777U - Digital valve pilot system - Google Patents
Digital valve pilot system Download PDFInfo
- Publication number
- CN204082777U CN204082777U CN201420394538.0U CN201420394538U CN204082777U CN 204082777 U CN204082777 U CN 204082777U CN 201420394538 U CN201420394538 U CN 201420394538U CN 204082777 U CN204082777 U CN 204082777U
- Authority
- CN
- China
- Prior art keywords
- digital valve
- tested digital
- oil
- tested
- hydraulic cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Check Valves (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The utility model relates to the pilot system of digital valve.For a long time consuming time when using oscillograph to test tested digital valve dutycycle for solving, test efficiency is low, the problem that test result is easily disturbed and experimentation cost is high, the utility model proposes a kind of digital valve pilot system, comprise fuel tank, oil pump, oil inlet passage, four tested digital valve, piston-type hydraulic cylinder and drainback passage, oil pump suction mouth is connected with fuel tank, oil outlet is connected with oil inlet passage, oil inlet passage has two branch roads, respectively with first, the filler opening of the second tested digital valve connects, the oil outlet of the first tested digital valve is connected with the first cavity of oil hydraulic cylinder, the oil outlet of the second tested digital valve is connected with the second cavity of oil hydraulic cylinder, 3rd, the oil outlet of the 4th tested digital valve is all connected with one end of drainback passage, the drainback passage the other end is connected with fuel tank.Use the utility model digital valve pilot system, can accurately draw digital valve actual duty cycle, for the practical application of digital valve provides safeguard.
Description
Technical field
The utility model relates to hydraulic test system field, particularly relates to a kind of pilot system can carrying out delivery test to digital valve.
Background technique
Digital valve is by multiple valve group formed by the valve of binary array, and the flow coefficient of each valve presses binary sequence design.Each valve of composition digital valve is switch valve, namely only opens and closes two states.Therefore, the piston actuator that their control can adopt solenoid valve or band spring to return is realized.The switching speed of each valve is very fast, and the closing property of each valve is also the important indicator weighing digital valve performance, and it not only affects negotiability and leakage rate, also affects the Control platform of control system.For ensureing the closing property of each valve, usually adopting the recoverable actuator of spring, meanwhile, adopting the opening and closing simultaneously of multiple more small-bore valves to realize to the valve of large discharge coefficient.
Digital valve has that resolution is high, precision is high, fast response time, closing property are good, reproducibility is good, tracing property is good and can directly carry out with computer the feature that is connected, makes the application of digital valve more and more extensive.The determination of a series of performances such as along with the increase of digital valve application area, the significance of digital valve also increases the weight of increasingly, and therefore whether the frequency response of digital valve is up to standard, whether impact resistance is enough is that can digital valve a necessary condition of stable operation.And whether digital valve frequency response is up to standard, mainly see digital valve in use, whether the error between actual duty cycle and theoretical dutycycle is within error allowed band.Because detected element is a most important part in hydraulic test equipment, the difference of test element causes the system of testing installation to have very big-difference, and therefore the performance of digital valve cannot use existing valve class pilot system to test.The mode of those skilled in the art's many employings oscillograph monitoring digital valve, the actual duty cycle of digital valve is embodied (ratio that the dutycycle of digital valve refers to time that in whole working procedure, digital valve is opened and total current"on"time) by oscillograph, but oscillographic adjustment is for a long time consuming time, in test process, be easily subject to the interference of outer signals, occur that the inaccurate probability of test result is larger; And after changing the digital valve needing test, need oscillograph be readjusted, make test process for a long time consuming time, cause test efficiency lower, be delayed the time of making the product of digital valve.Meanwhile, because oscillograph is high-accuracy laboratory apparatus, expensive and require higher to Environmental Conditions, can not test in factory building, special laboratory must be set, cause the cost using oscillograph spent when testing digital valve dutycycle higher.
Model utility content
For a long time consuming time when using oscillograph to test tested digital valve dutycycle for solving, test efficiency is low, the problem that test result is easily disturbed and experimentation cost is high, the utility model proposes a kind of digital valve pilot system, this digital valve Test pack oil scraper case, oil pump, oil inlet passage, four tested digital valve, piston-type hydraulic cylinder and drainback passage, the inlet port of described oil pump is connected with described fuel tank, oil outlet is connected with described oil inlet passage, described oil inlet passage is provided with two branch roads, the filler opening of digital valve tested with first is connected with the filler opening of the second tested digital valve respectively, the described oil outlet of the first tested digital valve is connected with the first cavity of described piston-type hydraulic cylinder, the described oil outlet of the second tested digital valve is connected with the second cavity of described piston-type hydraulic cylinder, and the pipeline that is connected with described piston-type hydraulic cylinder first cavity of the oil outlet of described first tested digital valve is provided with arm, this arm is connected with the filler opening of the 4th tested digital valve, the pipeline that the oil outlet of described second tested digital valve is connected with described piston-type hydraulic cylinder second cavity is provided with arm, this arm is connected with the filler opening of the 3rd tested digital valve, the oil outlet of described 3rd tested digital valve is all connected with one end of described drainback passage with the oil outlet of described 4th tested digital valve, the other end of described drainback passage is connected with described fuel tank.
Preferably, this digital valve pilot system also comprises displacement transducer, and institute's displacement sensors is in order to measure the displacement of described piston hydraulic cylinder piston rod.The measuring accuracy of institute's displacement sensors is high, there is not reading error and easily realizes digitizing, can access in computer system easily.
Preferably, described piston-type hydraulic cylinder is double rod type piston-type hydraulic cylinder.The piston both sides of described double rod type piston-type hydraulic cylinder are provided with piston rod, and any side no matter to this double rod type piston-type hydraulic cylinder is filled with hydraulic oil, and the piston rod in opposite side cavity all can stretch out, and easy-to-operat personnel carry out record.
Further, described digital valve pilot system arranges two displacement transducers, is separately positioned on the both sides of described double rod type piston-type hydraulic cylinder.Use the change in displacement of displacement transducer to described double rod type piston hydraulic cylinder piston rod to measure, accurately can draw the extrusion of piston rod, improve measuring accuracy.
Preferably, described fuel tank is also provided with oil-suction oil filter and return oil filter, described oil-suction oil filter is arranged between described fuel tank and described oil pump, and described return oil filter is arranged between described drainback passage and described fuel tank.Described oil-suction oil filter and described return oil filter are in order to ensure the clean degree of hydraulic oil in described digital valve pilot system, thus ensure that the safety in utilization of each element in oil circuit, avoid element damping hole etc. to be caused damage even to damage by the pollutant blocking in fluid.
Preferably, described digital valve pilot system adopts electric control system to come the switch of each element in control system and the keying of tested digital valve and adjustment.Drive singal due to digital valve is binary signal, and therefore digital valve can directly be connected with computer system easily, and without the need to digiverter, avoids the loss of signal brought in transfer process, and control accuracy is improved.
Use the utility model digital valve pilot system, accurately can draw the actual duty cycle of tested digital valve, by the error between the theoretical dutycycle of the tested digital valve of comparison and actual duty cycle whether in error allowed band, thus show that whether tested digital valve qualified, for digital valve dispatch from the factory and practical application provides safeguard.Meanwhile, when using the dutycycle of the utility model digital valve pilot system test digital valve, test speed is fast, test efficiency is high, and without the need to readjusting system after changing tested digital valve, easy to operate, process of the test is less by extraneous factor interference, and test result is accurate.The utility model also comprises a kind of method adopting described digital valve pilot system to test digital valve actual duty cycle, tests the actual duty cycle d of described first tested digital valve
1' time, under making described first tested digital valve be operated in voltage rating, at t whole current"on"time
1interior normal work, the break-make situation of described second tested digital valve is just in time contrary with described first tested digital valve, and described 3rd tested digital valve is often opened, and described 4th tested digital valve is normally closed; Measure at t
1after being filled with hydraulic oil in the first cavity be connected with described first tested digital valve oil outlet to described piston-type hydraulic cylinder in time, the displacement h of piston rod movement
1, then according to the cross-section area S of oil hydraulic cylinder, the cross-section area s of piston rod, obtain the volume Q of the hydraulic oil be filled with in described piston-type hydraulic cylinder
1, measure described first tested digital valve oil outlet cross-sectional area A
1, the flow velocity v of hydraulic oil in system, according to the actual duty cycle d of described first tested digital valve
1'=Q
1/ (10
6a
1vt
1), calculate the actual duty cycle d of described first tested digital valve
1';
Test the actual duty cycle d of described second tested digital valve
2' time, under making described second tested digital valve be operated in voltage rating, at t whole current"on"time
2interior normal work, the break-make situation of described first tested digital valve is just in time contrary with described second tested digital valve, and described 3rd tested digital valve is normally closed, and described 4th tested digital valve is often opened; Measure at t
2after being filled with hydraulic oil in the second cavity be connected with described second tested digital valve oil outlet to described piston-type hydraulic cylinder in time, the displacement h of piston rod movement
2, then according to the cross-section area S of oil hydraulic cylinder, the cross-section area s of piston rod, obtain the volume Q of the hydraulic oil be filled with in described piston-type hydraulic cylinder
2, measure described second tested digital valve oil outlet cross-sectional area A
2, the flow velocity v of hydraulic oil in system, according to the actual duty cycle d of described second tested digital valve
2'=Q
2/ (10
6a
2vt
2), calculate the actual duty cycle d of described second tested digital valve
2';
Test the actual duty cycle d of described 3rd tested digital valve
3' time, under making the 3rd tested digital valve be operated in voltage rating, at t whole current"on"time
3interior normal work, described first tested digital valve is normally closed, and described second tested digital valve is often opened, and described 4th tested digital valve is often opened; Measure at t
3after being filled with hydraulic oil in the second cavity be connected with described 3rd tested digital valve filler opening to described piston-type hydraulic cylinder in time, the displacement h of piston rod movement
3, then according to the cross-section area S of oil hydraulic cylinder, the cross-section area s of piston rod, obtain the volume Q of the hydraulic oil be filled with in described piston-type hydraulic cylinder
3, the rotating speed of described oil pump is n, discharge capacity is q
v, measure described 3rd tested digital valve oil outlet cross-sectional area A
3, the flow velocity v of hydraulic oil in system, according to the actual duty cycle d of described 3rd tested digital valve
3'=(nq
vt
3-Q
3)/(10
6a
3vt
3), calculate the actual duty cycle d of described 3rd tested digital valve
3';
Test the actual duty cycle d of described 4th tested digital valve
4' time, under making the 4th tested digital valve be operated in voltage rating, at t whole current"on"time
4interior normal work, described first tested digital valve is often opened, and described second tested digital valve is normally closed, and described 3rd tested digital valve is often opened; Measure at t
4after being filled with hydraulic oil in the first cavity be connected with described 4th tested digital valve filler opening to described piston-type hydraulic cylinder in time, the displacement h of piston rod movement
4, then according to the cross-section area S of oil hydraulic cylinder, the cross-section area s of piston rod, obtain the volume Q of the hydraulic oil be filled with in described piston-type hydraulic cylinder
4, the rotating speed of described oil pump is n, discharge capacity is q
v, measure described 4th tested digital valve oil outlet cross-sectional area A
4, the flow velocity v of hydraulic oil in system, according to the actual duty cycle d of described 4th tested digital valve
4'=(nq
vt
4-Q
4)/(10
6a
4vt
4), calculate the actual duty cycle d of described 4th tested digital valve
4'.
When needing the actual duty cycle of the tested digital valve of test first, first to four tested digital valve energisings, and under making the first tested digital valve be operated in voltage rating, normally work within whole current"on"time.Control the second tested digital valve, make the break-make situation of the second tested digital valve just in time contrary with the first tested digital valve, also namely when the first tested digital valve is opened, the second tested digital valve is closed; When the first tested digital valve is closed, the second tested digital valve is opened.After opening the 3rd tested digital valve by valve core movement to the limit position of control system control the 3rd tested digital valve, spool is rested on this extreme position, the 3rd tested digital valve is made to be in normally open, after closing the 4th tested digital valve by valve core movement to the limit position of control system control the 4th tested digital valve, spool is rested on this extreme position, make the 4th tested digital valve be in normally off.
Hydraulic oil is extracted out by oil pump from fuel tank, send in described oil inlet passage, when the first tested digital valve is opened, hydraulic oil flows into from the filler opening of the first tested digital valve, oil outlet flows out, and the oil outlet of the first tested digital valve and the filler opening of the 4th tested digital valve are connected with the first cavity of described piston-type hydraulic cylinder, but because the 4th tested digital valve is in normally off, therefore the hydraulic oil flowed out from the oil outlet of the first tested digital valve flows in the first cavity of described piston-type hydraulic cylinder, the piston rod of this piston-type hydraulic cylinder is moved to another first of described piston-type hydraulic cylinder.Because digital valve is switch valve, when the first tested digital valve normally works under voltage rating, first tested digital valve there will be periodically open/close states, and due to the tested digital valve of Systematical control second, make the open/close states of the second tested digital valve and the first tested digital valve antithesis, therefore, close in the first tested digital valve, when second tested digital valve is opened, hydraulic oil flows into from the open second tested digital valve, often open the 3rd tested digital valve flows into drainback passage, finally flows back in described fuel tank.
In the whole working procedure of tested digital valve, the ratio of the cumulative time that the filler opening of tested digital valve is communicated with oil outlet and total current"on"time is called the dutycycle of digital valve, the utility model utilizes the dutycycle of tested digital valve, make system within total current"on"time of tested digital valve, when only having the first tested digital valve to open, the first tested digital valve that hydraulic oil can be opened by this is charged in the first cavity of described piston-type hydraulic cylinder.And when being filled with hydraulic oil in first cavity of system to described piston-type hydraulic cylinder, the piston of this piston-type hydraulic cylinder is pushed, second cavity volume reduces, hydraulic oil in second cavity is by the connecting pipeline with the often open the 3rd tested digital valve filler opening, flow into the 3rd tested digital valve, finally flow back to fuel tank through described drainback passage.
When this pilot system is at t
1it is Q that the first tested digital valve by being communicated with in time is filled with volume in the first cavity of described piston-type hydraulic cylinder
1during the hydraulic oil of (unit is mL, milliliter), piston rod is h to the displacement of the opposite side movement of described piston-type hydraulic cylinder
1, then according to the displacement h of the cross-section area S of described piston-type hydraulic cylinder, the cross-section area s of piston rod and piston rod
1, the volume Q of the hydraulic oil be filled with in described piston-type hydraulic cylinder first cavity can be calculated
1.If have piston rod, then at t in the first cavity that described piston-type hydraulic cylinder is connected with described first tested digital valve oil outlet
1the volume Q of the hydraulic oil in described piston-type hydraulic cylinder first cavity is filled with in time
1equal the boost value Sh of this side oil hydraulic cylinder volume
1deducting length is h
1the volume sh of piston rod
1; If piston-rodless in the first cavity that described piston-type hydraulic cylinder is connected with described first tested digital valve oil outlet, then the hydraulic oil be filled with in this side cavity promotes piston, and the length that the piston rod in described piston-type hydraulic cylinder second cavity is stretched out is h
1, then at t
1the volume Q of the hydraulic oil in described piston-type hydraulic cylinder first cavity is filled with in time
1equal the boost value Sh of this side oil hydraulic cylinder volume
1.And at t
1in time, only have the filler opening of the first tested digital valve and oil outlet to be in connected state, when also namely the first tested digital valve is opened, hydraulic oil can be filled with in the first cavity of described piston-type hydraulic cylinder, therefore, at t by system
1in time, the real time being filled with hydraulic oil in the first cavity of described piston-type hydraulic cylinder is that the first tested digital valve is at t
1total opening time t in time
1'.Again according to the first tested digital valve oil outlet cross-sectional area A
1, unit is m
2(square metre); The flow velocity v of hydraulic oil in system, unit is m/s (meter per second); Thus draw Q
1=10
6a
1vt
1', then the first tested digital valve is at t
1total opening time t in time
1'=Q
1/ (10
6a
1v).
According to the definition of digital valve dutycycle, draw the actual duty cycle d of the first tested digital valve under voltage rating during normal work
1'=t
1'/t
1=Q
1/ (10
6a
1vt
1).
By the design load d of the dutycycle of the first tested digital valve
1with tested by this pilot system after the actual value d of the dutycycle of the first tested digital valve that calculates
1' compare, if d
1with d
1' between error in error allowed band, then this first tested digital valve is qualified.
After the actual duty cycle test of the first tested digital valve terminates, when needing to test the actual duty cycle of the second tested digital valve, in system, the Placement of each element and original state are not all changed, only need to four tested digital valve energisings, and under making the second tested digital valve be operated in voltage rating, normally work within whole current"on"time.Control the first tested digital valve, make the break-make situation of the first tested digital valve just in time contrary with the second tested digital valve, also namely when the second tested digital valve is opened, the first tested digital valve is closed; When the second tested digital valve is closed, the first tested digital valve is opened.After closing the 3rd tested digital valve by valve core movement to the limit position of control system control the 3rd tested digital valve, spool is rested on this extreme position, make the 3rd tested digital valve be in normally off; After opening the 4th tested digital valve by valve core movement to the limit position of control system control the 4th tested digital valve, spool is rested on this extreme position, make the 4th tested digital valve be in normally open.
Hydraulic oil is extracted out by oil pump from fuel tank, send in described oil inlet passage, when the second tested digital valve is opened, hydraulic oil flows into from the filler opening of the second tested digital valve, oil outlet flows out, and the oil outlet of the second tested digital valve and the filler opening of the 3rd tested digital valve are connected with the second cavity of described piston-type hydraulic cylinder, but because the 3rd tested digital valve is in normally off, therefore the hydraulic oil flowed out from the oil outlet of the second tested digital valve flows in the second cavity of described piston-type hydraulic cylinder, the piston rod of this piston-type hydraulic cylinder is moved to the first cavity of this piston-type hydraulic cylinder.Because digital valve is switch valve, when the second tested digital valve normally works under voltage rating, this second tested digital valve there will be periodically open/close states, and due to the tested digital valve of Systematical control first, make the open/close states of the first tested digital valve and the second tested digital valve antithesis, therefore, close in the second tested digital valve, when first tested digital valve is opened, hydraulic oil flows into from the open first tested digital valve, often open the 4th tested digital valve flows into drainback passage, finally flows back in described fuel tank.
In the whole working procedure of tested digital valve, the ratio of the cumulative time that the filler opening of tested digital valve is communicated with oil outlet and total current"on"time is called the dutycycle of digital valve, the utility model utilizes the dutycycle of tested digital valve, make system within total current"on"time of tested digital valve, when only having the second tested digital valve to open, the second tested digital valve that hydraulic oil can be opened by this is charged in the second cavity of described piston-type hydraulic cylinder.And when being filled with hydraulic oil in second cavity of system to described piston-type hydraulic cylinder, the piston of this piston-type hydraulic cylinder is pushed, first cavity volume reduces, and the hydraulic oil in this side cavity is by the connecting pipeline with the often open the 4th tested digital valve filler opening, flow into the 4th tested digital valve, finally flow back to fuel tank through described drainback passage.
When this pilot system is at t
2it is Q that the second tested digital valve by being communicated with in time is filled with volume in the second cavity of described piston-type hydraulic cylinder
2during the hydraulic oil of (unit is mL, milliliter), piston rod is h to the displacement of described piston-type hydraulic cylinder side movement
2, then according to the displacement h of the cross-section area S of described piston-type hydraulic cylinder, the cross-section area s of piston rod and piston rod
2, the volume Q of the hydraulic oil be filled with in described piston-type hydraulic cylinder second cavity can be calculated
2.If have piston rod, then at t in the first cavity that described piston-type hydraulic cylinder is connected with described second tested digital valve oil outlet
2the volume Q of the hydraulic oil in described piston-type hydraulic cylinder first cavity is filled with in time
2equal the boost value Sh of this side oil hydraulic cylinder volume
2deducting length is h
2the volume sh of piston rod
2; If piston-rodless in the first cavity that described piston-type hydraulic cylinder is connected with described second tested digital valve oil outlet, then the hydraulic oil be filled with in this side cavity promotes piston, and the length that the piston rod in described piston-type hydraulic cylinder second cavity is stretched out is h
2, then at t
2the volume Q of the hydraulic oil in described piston-type hydraulic cylinder first cavity is filled with in time
2equal the boost value Sh of this side oil hydraulic cylinder volume
2.And at t
2in time, only have the filler opening of the second tested digital valve and oil outlet to be in connected state, when also namely the second tested digital valve is opened, hydraulic oil can be filled with in the second cavity of described piston-type hydraulic cylinder, therefore, at t by system
2in time, the real time being filled with hydraulic oil in the second cavity of described piston-type hydraulic cylinder is that the second tested digital valve is at t
2total opening time t in time
2'.Again according to the second tested digital valve oil outlet cross-sectional area A
2, unit is m
2(square metre); The flow velocity v of hydraulic oil in system, unit is m/s (meter per second); Thus draw Q
2=10
6a
2vt
2', then the second tested digital valve is at t
2total opening time t in time
2'=Q
2/ (10
6a
2v).
According to the definition of digital valve dutycycle, draw the actual duty cycle d of the second tested digital valve under voltage rating during normal work
2'=t
2'/t
2=Q
2/ (10
6a
2vt
2).
By the design load d of the dutycycle of the second tested digital valve
2with tested by this pilot system after the actual value d of the dutycycle of the second tested digital valve that calculates
2' compare, if d
2with d
2' between error in error allowed band, then this second tested digital valve is qualified.
When needing the actual duty cycle of the tested digital valve of test the 3rd, first to four tested digital valve energisings, and under making the 3rd tested digital valve be operated in voltage rating, normally work within whole current"on"time.And after closing this first tested digital valve by valve core movement to the limit position that control system controls the first tested digital valve, spool is rested on this extreme position, make this first tested digital valve be in normally off; After valve core movement to the limit position controlling the second tested digital valve by control system opens this second tested digital valve, spool is rested on this extreme position, make this second tested digital valve be in normally open; After opening the 4th tested digital valve by valve core movement to the limit position of control system control the 4th tested digital valve, spool is rested on this extreme position, make the 4th tested digital valve be in normally open.
Hydraulic oil is extracted out by oil pump from fuel tank, send in described oil inlet passage, because the first tested digital valve is in normally off, therefore hydraulic oil can only flow into from the filler opening of the often open second tested digital valve, oil outlet flows out, and the oil outlet of the second tested digital valve is not only connected with the second cavity of described piston-type hydraulic cylinder, be also connected with the filler opening of described 3rd tested digital valve.Therefore, when the 3rd tested digital valve is opened, the hydraulic oil flowed out from the oil outlet of the second tested digital valve flows to described drainback passage through this 3rd tested digital valve opened, finally flows back in described fuel tank; When the 3rd tested digital valve is closed, the pipeline that hydraulic oil is connected with the second cavity of described piston-type hydraulic cylinder through the oil outlet of the second tested digital valve, flow in the second cavity of described oil hydraulic cylinder, promote the piston of this piston-type hydraulic cylinder, piston rod is moved to the side of this oil hydraulic cylinder.
In the whole working procedure of tested digital valve, the ratio of the cumulative time that the filler opening of tested digital valve is communicated with oil outlet and total current"on"time is called the dutycycle of digital valve, the utility model utilizes the dutycycle of tested digital valve, make system within total current"on"time of tested digital valve, when only having the 3rd tested digital valve to close, hydraulic oil can be charged in the second cavity of described piston-type hydraulic cylinder by keeping the second tested digital valve of normally open.And when being filled with hydraulic oil in second cavity of system to described piston-type hydraulic cylinder, the piston of this piston-type hydraulic cylinder is pushed, piston rod moves to the side of this piston-type hydraulic cylinder, by the hydraulic oil in this first cavity inner chamber body by discharging with the connecting pipeline of the 4th tested digital valve filler opening keeping normally open, this part hydraulic oil be discharged finally flows back to fuel tank through described drainback passage after entering this 4th tested digital valve often opened.
When this pilot system is at t
3it is Q that the second tested digital valve by often opening in time is filled with volume in the second cavity of described piston-type hydraulic cylinder
3during the hydraulic oil of (unit is mL, milliliter), piston rod is h to the displacement of the side movement of this piston-type hydraulic cylinder
3, according to the displacement h of the cross-section area S of described piston-type hydraulic cylinder, the cross-section area s of piston rod and piston rod
3, the volume Q of the hydraulic oil be filled with in described piston-type hydraulic cylinder second cavity can be calculated
3.If have piston rod, then at t in the first cavity that described piston-type hydraulic cylinder is connected with described 3rd tested digital valve filler opening
3the volume Q of the hydraulic oil in described piston-type hydraulic cylinder first cavity is filled with in time
3equal the boost value Sh of this side oil hydraulic cylinder volume
3deducting length is h
3the volume sh of piston rod
3; If piston-rodless in the first cavity that described piston-type hydraulic cylinder is connected with described 3rd tested digital valve filler opening, then the hydraulic oil be filled with in this side cavity promotes piston, and the length that the piston rod in described piston-type hydraulic cylinder second cavity is stretched out is h
3, then at t
3the volume Q of the hydraulic oil in described piston-type hydraulic cylinder first cavity is filled with in time
3equal the boost value Sh of this side oil hydraulic cylinder volume
3.And at t
3in time, when only having the filler opening of the 3rd tested digital valve not to be communicated with oil outlet, when also namely the 3rd tested digital valve is closed, hydraulic oil can be filled with in the second cavity of described piston-type hydraulic cylinder, therefore, at t by system
3in time, by total amount the Q '=nq keeping second of normally open the tested digital valve to flow into the hydraulic oil of system
vt
3, wherein,
N is the rotating speed of oil pump, and unit is r/min (rev/min);
Q
vfor oily pump delivery, unit is mL/r (milliliter/turn).
Due to the t total current"on"time in the 3rd tested digital valve
3in, the total amount of the hydraulic oil flowed in described piston-type hydraulic cylinder second cavity by the second tested digital valve often opened is Q
3, therefore, at t
3flowed back to total oil mass Q of fuel tank by the 3rd tested digital valve in time
3'=Q '-Q
3=nq
vt
3-Q
3.
And the 3rd tested digital valve is only when connected state, hydraulic oil just can flow back in fuel tank by the 3rd tested digital valve be communicated with, and supposes the cumulative time t in the 3rd tested digital valve energising
3in, the cumulative time that the 3rd tested digital valve is in connected state is t
3', then according to the 3rd tested digital valve oil outlet cross-sectional area A
3, unit is m
2(square metre); The flow velocity v of hydraulic oil in system, unit is m/s (meter per second); Thus draw Q
3'=10
6a
3vt
3', by Q
3'=nq
vt
3-Q
3substitute into, draw nq
vt
3-Q
3=10
6a
3vt
3', then the 3rd tested digital valve is in the cumulative time of connected state is t
3'=(nq
vt
3-Q
3)/(10
6a
3v).
According to the definition of digital valve dutycycle, draw the actual duty cycle d of the 3rd tested digital valve under voltage rating during normal work
3'=t
3'/t
3=(nq
vt
3-Q
3)/(10
6a
3vt
3).
By the design load d of the dutycycle of the 3rd tested digital valve
3with tested by this pilot system after the actual value d of the dutycycle of the 3rd tested digital valve that calculates
3' compare, if d
3with d
3' between error in error allowed band, then the 3rd tested digital valve is qualified.
When needing the actual duty cycle of the tested digital valve of test the 4th, first to four tested digital valve energisings, and under making the 4th tested digital valve be operated in voltage rating, normally work within whole current"on"time.And after opening this first tested digital valve by valve core movement to the limit position that control system controls the first tested digital valve, spool is rested on this extreme position, make this first tested digital valve be in normally open; After valve core movement to the limit position controlling the second tested digital valve by control system closes this second tested digital valve, spool is rested on this extreme position, make this second tested digital valve be in normally off; After opening the 3rd tested digital valve by valve core movement to the limit position of control system control the 3rd tested digital valve, spool is rested on this extreme position, make the 3rd tested digital valve be in normally open.
Hydraulic oil is extracted out by oil pump from fuel tank, send in described oil inlet passage, because the second tested digital valve is in normally off, therefore hydraulic oil can only flow into from the filler opening of the often open first tested digital valve, oil outlet flows out, and the oil outlet of the first tested digital valve is not only connected with the first cavity of described piston-type hydraulic cylinder, be also connected with the filler opening of described 4th tested digital valve.Therefore, when the 4th tested digital valve is opened, the hydraulic oil flowed out from the oil outlet of the first tested digital valve flows to described drainback passage through this 4th tested digital valve opened, finally flows back in described fuel tank; When the 4th tested digital valve is closed, the pipeline that hydraulic oil is connected with the first cavity of described piston-type hydraulic cylinder through the oil outlet of the first tested digital valve, flow in the first cavity of described oil hydraulic cylinder, promote the piston of this piston-type hydraulic cylinder, piston rod is moved to the opposite side of this oil hydraulic cylinder.
In the whole working procedure of tested digital valve, the ratio of the cumulative time that the filler opening of tested digital valve is communicated with oil outlet and total current"on"time is called the dutycycle of digital valve, the utility model utilizes the dutycycle of tested digital valve, make system within total current"on"time of tested digital valve, when only having the 4th tested digital valve to close, hydraulic oil can be charged in the first cavity of described piston-type hydraulic cylinder by keeping the first tested digital valve of normally open.And when being filled with hydraulic oil in first cavity of system to described piston-type hydraulic cylinder, the piston of this piston-type hydraulic cylinder is pushed, piston rod moves to the opposite side of this piston-type hydraulic cylinder, by the hydraulic oil in this second cavity by discharging with the connecting pipeline of the 3rd tested digital valve filler opening keeping normally open, this part hydraulic oil be discharged finally flows back to fuel tank through described drainback passage after entering this 3rd tested digital valve often opened.
When this pilot system is at t
4it is Q that the first tested digital valve by often opening in time is filled with volume in the first cavity of described piston-type hydraulic cylinder
4during the hydraulic oil of (unit is mL, milliliter), piston rod is h to the displacement of the opposite side movement of this piston-type hydraulic cylinder
4, then according to the displacement h of the cross-section area S of described piston-type hydraulic cylinder, the cross-section area s of piston rod and piston rod
4, the volume Q of the hydraulic oil be filled with in described piston-type hydraulic cylinder first cavity can be calculated
4.If have piston rod, then at t in the first cavity that described piston-type hydraulic cylinder is connected with described 4th tested digital valve filler opening
4the volume Q of the hydraulic oil in described piston-type hydraulic cylinder first cavity is filled with in time
4equal the boost value Sh of this side oil hydraulic cylinder volume
4deducting length is h
4the volume sh of piston rod
4; If piston-rodless in the first cavity that described piston-type hydraulic cylinder is connected with described 4th tested digital valve filler opening, then the hydraulic oil be filled with in this side cavity promotes piston, and the length that the piston rod in described piston-type hydraulic cylinder second cavity is stretched out is h
4, then at t
4the volume Q of the hydraulic oil in described piston-type hydraulic cylinder first cavity is filled with in time
4equal the boost value Sh of this side oil hydraulic cylinder volume
4.And at t
4in time, when only having the filler opening of the 4th tested digital valve not to be communicated with oil outlet, when also namely the 4th tested digital valve is closed, hydraulic oil can be filled with in the first cavity of described piston-type hydraulic cylinder, therefore, at t by system
4in time, the total amount Q by keeping first of normally open the tested digital valve to flow into the hydraulic oil of system "=nq
vt
4, wherein,
N is the rotating speed of oil pump, and unit is r/min (rev/min);
Q
vfor oily pump delivery, unit is mL/r (milliliter/turn).
Due to the t total current"on"time in the 4th tested digital valve
4in, the total amount of the hydraulic oil flowed in described piston-type hydraulic cylinder first cavity by the first tested digital valve often opened is Q
4, therefore, at t
4flowed back to total oil mass Q of fuel tank by the 4th tested digital valve in time
4'=Q "-Q
4=nq
vt
4-Q
4.
And the 4th tested digital valve is only when connected state, hydraulic oil just can flow back in fuel tank by the 4th tested digital valve be communicated with, and supposes the cumulative time t in the 4th tested digital valve energising
4in, the cumulative time that the 4th tested digital valve is in connected state is t
4', then according to the 4th tested digital valve oil outlet cross-sectional area A
4, unit is m
2(square metre); The flow velocity v of hydraulic oil in system, unit is m/s (meter per second); Thus draw Q
4'=10
6a
4vt
4', by Q
4'=nq
vt
4-Q
4substitute into, draw nq
vt
4-Q
4=10
6a
4vt
4', then the 4th tested digital valve is in the cumulative time of connected state is t
4'=(nq
vt
4-Q
4)/(10
6a
4v).
According to the definition of digital valve dutycycle, draw the actual duty cycle d of the 4th tested digital valve under voltage rating during normal work
4'=t
4'/t
4=(nq
vt
4-Q
4)/(10
6a
4vt
4).
By the design load d of the dutycycle of the 4th tested digital valve
4with tested by this pilot system after the actual value d of the dutycycle of the 4th tested digital valve that calculates
4' compare, if d
4with d
4' between error in error allowed band, then the 4th tested digital valve is qualified.
The actual duty cycle of the utility model digital valve pilot system to digital valve is used to test, accurately can draw the actual duty cycle of tested digital valve, by comparing with the theoretical dutycycle of tested digital valve, see error whether in error allowed band, thus show that whether tested digital valve is qualified, for the practical application of digital valve provides safeguard.Simultaneously, in the utility model digital valve pilot system, element is less, simple to operation, and can after in system, each element has connected, when in system, element does not change, often group test directly can realize the actual duty cycle of test four digital valve, greatly improves test efficiency, the dutycycle test of four tested digital valve is without sequencing requirement, and test flexibility is stronger.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model digital valve pilot system.
Embodiment
As shown in Figure 1, the utility model digital valve pilot system comprises fuel tank 1, oil pump 2, oil inlet passage P, first tested digital valve 31, second tested digital valve 32, 3rd tested digital valve 33, 4th tested digital valve 34, double rod type piston-type hydraulic cylinder 4 and drainback passage T, the inlet port of oil pump 2 is connected by oil-suction oil filter 11 with fuel tank 1, the oil outlet of oil pump 2 is connected with oil inlet passage P, oil inlet passage P is provided with two branch roads, the filler opening of digital valve 31 tested with first is connected with the filler opening of the second tested digital valve 32 respectively, the oil outlet of the first tested digital valve 31 is connected with the first cavity of oil hydraulic cylinder 4, the oil outlet of the second tested digital valve 32 is connected with the second cavity of oil hydraulic cylinder 4, and the pipeline that is connected with oil hydraulic cylinder 4 first cavity of the oil outlet of the first tested digital valve 31 is provided with arm, this arm is connected with the filler opening of the 4th tested digital valve 34, the pipeline that the oil outlet of the second tested digital valve 32 is connected with oil hydraulic cylinder 4 second cavity is provided with arm, this arm is connected with the filler opening of the 3rd tested digital valve 33, the oil outlet of the 3rd tested digital valve 33 is all connected with one end of drainback passage T with the oil outlet of the 4th tested digital valve 34, the other end of drainback passage T is connected with fuel tank 1 by return oil filter 12.
Preferably, the utility model digital valve pilot system adopts electric control system to come the switch of each element in control system and the keying of four tested digital valve and adjustment.Drive singal due to digital valve is binary signal, and therefore digital valve can directly be connected with computer system easily, and without the need to digiverter, avoids the loss of signal brought in transfer process, and control accuracy is improved.
When needing the actual duty cycle of the tested digital valve 31 of test first, first to four tested digital valve energisings, and under making the first tested digital valve 31 be operated in voltage rating, normally work within whole current"on"time.Control the second tested digital valve 32, make the break-make situation of the second tested digital valve 32 just in time contrary with the first tested digital valve 31, also namely when the first tested digital valve 31 is opened, the second tested digital valve 32 is closed; When the first tested digital valve 31 is closed, the second tested digital valve 32 is opened.After opening the 3rd tested digital valve 33 by valve core movement to the limit position of control system control the 3rd tested digital valve 33, spool is rested on this extreme position, make the 3rd tested digital valve 33 be in normally open; Spool, to limit position closedown the 4th tested digital valve 34, is rested on this extreme position, makes the 4th tested digital valve 34 be in normally off by the valve core movement being controlled the 4th tested digital valve 34 by control system.
Hydraulic oil is extracted out by oil pump 2 from fuel tank 1, after oil-suction oil filter 11 filters, send in oil inlet passage P, when the first tested digital valve 31 is opened, hydraulic oil flows into from the filler opening of the first tested digital valve 31, oil outlet flows out, and the oil outlet of the first tested digital valve 31 is connected with the first cavity of oil hydraulic cylinder 4 with the filler opening of the 4th tested digital valve 34, but because the 4th tested digital valve 34 is in normally off, therefore the hydraulic oil flowed out from the oil outlet of the first tested digital valve 31 flows in the first cavity of oil hydraulic cylinder 4, the piston of this oil hydraulic cylinder 4 is moved right, piston rod in second cavity stretches out.Because digital valve is switch valve, when the first tested digital valve 31 normally works under voltage rating, first tested digital valve 31 there will be periodically open/close states, and due to the tested digital valve 32 of Systematical control second, make the open/close states of the second tested digital valve 32 and the first tested digital valve 31 antithesis, therefore, 31 are closed in the first tested digital valve, when second tested digital valve 32 is opened, hydraulic oil flows into from the open second tested digital valve 32, often open the 3rd tested digital valve 33 flows into drainback passage T, after being filtered by return oil filter 12, finally flow back in fuel tank 1.
In the whole working procedure of tested digital valve, the ratio of the cumulative time that the filler opening of tested digital valve is communicated with oil outlet and total current"on"time is called the dutycycle of digital valve, the utility model utilizes the dutycycle of tested digital valve, make system within total current"on"time of tested digital valve, when only having the first tested digital valve 31 to open, the first tested digital valve 31 that hydraulic oil can be opened by this is charged in the first cavity of oil hydraulic cylinder 4.And when being filled with hydraulic oil in first cavity of system to oil hydraulic cylinder 4, the piston of this oil hydraulic cylinder 4 is pushed, second cavity volume reduces, hydraulic oil in second cavity is by the connecting pipeline of the filler opening with the often open the 3rd tested digital valve 33, flow into the 3rd tested digital valve 33, finally after drainback passage T is filtered by return oil filter 12, flow back to fuel tank 1.
When this pilot system is at t
1it is Q that the first tested digital valve 31 by being communicated with in time is filled with volume in the first cavity of oil hydraulic cylinder 4
1during the hydraulic oil of (unit is mL, milliliter), according to the measurement of the displacement transducer be arranged on the left of oil hydraulic cylinder 4, the length that first piston bar is return is h
1, then according to the cross-section area s of the first piston bar in the cross-section area S of oil hydraulic cylinder 4, the first cavity
1and the length h that first piston bar is return
1, can Q be drawn
1=Sh
1-s
1h
1.And at t
1in time, only have the filler opening of the first tested digital valve 31 and oil outlet to be in connected state, when also namely the first tested digital valve 31 is opened, hydraulic oil can be filled with in the first cavity of oil hydraulic cylinder 4, therefore, at t by system
1in time, the real time being filled with hydraulic oil in the first cavity of oil hydraulic cylinder 4 is that the first tested digital valve 31 is at t
1total opening time t in time
1'.Again according to the first tested digital valve 31 oil outlet cross-sectional area A
1, unit is m
2(square metre); The flow velocity v of hydraulic oil in system, unit is m/s (meter per second); Thus draw Q
1=10
6a
1vt
1', then the first tested digital valve 31 is at t
1total opening time t in time
1'=Q
1/ (10
6a
1v).
According to the definition of digital valve dutycycle, draw the actual duty cycle d of the first tested digital valve 32 under voltage rating during normal work
1'=t
1'/t
1=Q
1/ (10
6a
1vt
1).
By the design load d of the dutycycle of the first tested digital valve 31
1with tested by this pilot system after the actual value d of the dutycycle of the first tested digital valve 31 that calculates
1' compare, if d
1with d
1' between error in error allowed band, then this first tested digital valve 31 is qualified.
After the actual duty cycle test of the first tested digital valve 31 terminates, when needing to test the actual duty cycle of the second tested digital valve 32, in system, the Placement of each element and original state are not all changed, only need to four tested digital valve energisings, and under making the second tested digital valve 32 be operated in voltage rating, normally work within whole current"on"time.Control the first tested digital valve 31, make the break-make situation of the first tested digital valve 31 just in time contrary with the second tested digital valve 32, also namely when the second tested digital valve 32 is opened, the first tested digital valve 31 is closed; When the second tested digital valve 32 is closed, the first tested digital valve 31 is opened.Spool, to limit position closedown the 3rd tested digital valve 33, is rested on this extreme position, makes the 3rd tested digital valve 33 be in normally off by the valve core movement being controlled the 3rd tested digital valve 33 by control system; After opening the 4th tested digital valve 34 by valve core movement to the limit position of control system control the 4th tested digital valve 34, spool is rested on this extreme position, make the 4th tested digital valve 34 be in normally open.
Hydraulic oil is extracted out by oil pump 2 from fuel tank, after oil-suction oil filter 11 filters, send in oil inlet passage P, when the second tested digital valve 32 is opened, hydraulic oil flows into from the filler opening of the second tested digital valve 32, oil outlet flows out, and the oil outlet of the second tested digital valve 32 is connected with the second cavity of oil hydraulic cylinder 4 with the filler opening of the 3rd tested digital valve 33, but because the 3rd tested digital valve 33 is in normally off, therefore the hydraulic oil flowed out from the oil outlet of the second tested digital valve 32 flows in the second cavity of oil hydraulic cylinder 4, the piston of this oil hydraulic cylinder 4 is moved to the left, first piston bar stretches out.Because digital valve is switch valve, when the second tested digital valve 32 normally works under voltage rating, this second tested digital valve 32 there will be periodically open/close states, and due to the tested digital valve 31 of Systematical control first, make the open/close states of the first tested digital valve 31 and the second tested digital valve 32 antithesis, therefore, close in the second tested digital valve 32, when first tested digital valve 31 is opened, hydraulic oil flows into from the open first tested digital valve 31, often open the 4th tested digital valve 34 flows into drainback passage T, after being filtered by return oil filter 12, finally flow back in fuel tank 1.
In the whole working procedure of tested digital valve, the ratio of the cumulative time that the filler opening of tested digital valve is communicated with oil outlet and total current"on"time is called the dutycycle of digital valve, the utility model utilizes the dutycycle of tested digital valve, make system within total current"on"time of tested digital valve, when only having the second tested digital valve 32 to open, the second tested digital valve 32 that hydraulic oil can be opened by this is charged in the second cavity of oil hydraulic cylinder 4.And when being filled with hydraulic oil in second cavity of system to oil hydraulic cylinder 4, piston is promoted to the left by hydraulic oil, first cavity volume reduces, first piston bar stretches out, and hydraulic oil in the first cavity is by the connecting pipeline of the filler opening with the often open the 4th tested digital valve 34, flow into the 4th tested digital valve 34, finally flow back in fuel tank 1 after drainback passage T is filtered by return oil filter 12.
When this pilot system is at t
2it is Q that the second tested digital valve 32 by being communicated with in time is filled with volume in the second cavity of oil hydraulic cylinder 4
2during the hydraulic oil of (unit is mL, milliliter), according to the measurement of the displacement transducer be arranged on the right side of oil hydraulic cylinder 4, the length that the second piston rod is return is h
2, then according to the cross-section area S of oil hydraulic cylinder 4, the cross-section area s of the second piston rod
2and the second length h that return of piston rod
2, can Q be drawn
2=Sh
2-s
2h
2.And at t
2in time, only have the filler opening of the second tested digital valve 32 and oil outlet to be in connected state, when also namely the second tested digital valve 32 is opened, hydraulic oil can be filled with in the second cavity of oil hydraulic cylinder 4, therefore, at t by system
2in time, the real time being filled with hydraulic oil in the second cavity of oil hydraulic cylinder 4 is that the second tested digital valve 32 is at t
2total opening time t in time
2'.Again according to the second tested digital valve 32 oil outlet cross-sectional area A
2, unit is m
2(square metre); The flow velocity v of hydraulic oil in system, unit is m/s (meter per second); Thus draw Q
2=10
6a
2vt
2', then the second tested digital valve 32 is at t
2total opening time t in time
2'=Q
2/ (10
6a
2v).
According to the definition of digital valve dutycycle, draw the actual duty cycle d of the second tested digital valve 32 under voltage rating during normal work
2'=t
2'/t
2=Q
2/ (10
6a
2vt
2).
By the design load d of the dutycycle of the second tested digital valve 32
2with tested by this pilot system after the actual value d of the dutycycle of the second tested digital valve 32 that calculates
2' compare, if d
2with d
2' between error in error allowed band, then this tested digital valve is qualified.
When needing the actual duty cycle of the tested digital valve 33 of test the 3rd, first to four tested digital valve energisings, and under making the 3rd tested digital valve 33 be operated in voltage rating, normally work within whole current"on"time.And after closing the first tested digital valve 31 by valve core movement to the limit position that control system controls the first tested digital valve 31, spool is rested on this extreme position, make the first tested digital valve 31 be in normally off; After valve core movement to the limit position controlling the second tested digital valve 32 by control system opens the second tested digital valve 32, spool is rested on this extreme position, make the second tested digital valve 32 be in normally open; After opening the 4th tested digital valve 34 by valve core movement to the limit position of control system control the 4th tested digital valve 34, spool is rested on this extreme position, make the 4th tested digital valve 34 be in normally open.
Hydraulic oil is extracted out by oil pump 2 from fuel tank 1, after oil-suction oil filter 11 filters, send in oil inlet passage P, because the first tested digital valve 31 is in normally off, therefore hydraulic oil can only flow into from the filler opening of the often open second tested digital valve 32, oil outlet flows out, and the oil outlet of the second tested digital valve 32 is not only connected with the second cavity of oil hydraulic cylinder 4, and also the filler opening of digital valve 33 tested with the 3rd is connected.Therefore, when the 3rd tested digital valve 33 is opened, the 3rd tested digital valve 33 that the hydraulic oil flowed out from the oil outlet of the second tested digital valve 32 is opened through this flows to drainback passage T, after being filtered, finally flows back in fuel tank 1 by return oil filter 12; When the 3rd tested digital valve 33 is closed, the pipeline that hydraulic oil is connected with the second cavity of oil hydraulic cylinder 4 through the oil outlet of the second tested digital valve 32, flows in the second cavity of oil hydraulic cylinder 4, promotes the piston of oil hydraulic cylinder 4, the first piston bar of oil hydraulic cylinder 4 is stretched out.
In the whole working procedure of tested digital valve, the ratio of the cumulative time that the filler opening of tested digital valve is communicated with oil outlet and total current"on"time is called the dutycycle of digital valve, the utility model utilizes the dutycycle of tested digital valve, make system within total current"on"time of tested digital valve, when only having the 3rd tested digital valve 33 to close, hydraulic oil can be charged in the second cavity of oil hydraulic cylinder 4 by keeping the second tested digital valve 32 of normally open.And when being filled with hydraulic oil in second cavity of system to oil hydraulic cylinder 4, the piston of oil hydraulic cylinder 4 is pushed, first piston bar stretches out, by the hydraulic oil in this first cavity by discharging with the connecting pipeline of the 4th tested digital valve 34 filler opening keeping normally open, after this part hydraulic oil be discharged enters this 4th tested digital valve 34 often opened, filtered by return oil filter 12, finally flow back in fuel tank 1 through drainback passage T.
When this pilot system is at t
3it is Q that the second tested digital valve 32 by often opening in time is filled with volume in the second cavity of oil hydraulic cylinder 4
3during the hydraulic oil of (unit is mL, milliliter), according to the measurement of the displacement transducer be arranged on the right side of oil hydraulic cylinder 4, the length that the second piston rod is return is h
3, then according to the cross-section area s of the second piston rod in the cross-section area S of oil hydraulic cylinder 4, the second cavity
2and the second length h that return of piston rod
3, can Q be drawn
3=Sh
3-s
2h
3.And at t
3in time, when only having the filler opening of the 3rd tested digital valve 33 not to be communicated with oil outlet, when also namely the 3rd tested digital valve 33 is in closed condition, hydraulic oil can be filled with in the second cavity of oil hydraulic cylinder 4, therefore, at t by system
3in time, oil pump 2 extracts from fuel tank 1, total amount the Q '=nq by keeping the second tested digital valve 32 of normally open to flow into the hydraulic oil of system after sending into oil inlet passage P
vt
3, wherein,
N is the rotating speed of oil pump 2, and unit is r/min (rev/min);
Q
vfor the discharge capacity of oil pump 2, unit is mL/r (milliliter/turn).
Due to the t total current"on"time in the 3rd tested digital valve 33
3in, the total amount of the hydraulic oil flowed in oil hydraulic cylinder 4 second cavity by the second tested digital valve 32 often opened is Q
3, therefore, at t
3flowed back to total oil mass Q of fuel tank 1 by the 3rd tested digital valve 33 in time
3'=Q '-Q
3=nq
vt
3-Q
3.
And the 3rd tested digital valve 33 is only when connected state, hydraulic oil just can be flowed back in fuel tank 1 by the 3rd tested digital valve 33 be communicated with, and supposes the cumulative time t be energized in the 3rd tested digital valve 33
3in, the cumulative time that the 3rd tested digital valve 33 is in connected state is t
3', then according to the 3rd tested digital valve 33 oil outlet cross-sectional area A
3, unit is m
2(square metre); The flow velocity v of hydraulic oil in system, unit is m/s (meter per second); Thus draw Q
3'=10
6a
3vt
3', by Q
3'=nq
vt
3-Q
3substitute into, draw nq
vt
3-Q
3=10
6a
3vt
3', then the 3rd tested digital valve 33 is in the cumulative time of connected state is t
3'=nq
vt
3-Q
3/ (10
6a
3v).
According to the definition of digital valve dutycycle, draw the actual duty cycle d of the 3rd tested digital valve 33 under voltage rating during normal work
3'=t
3'/t
3=(nq
vt
3-Q
3)/(10
6a
3vt
3).
By the design load d of the dutycycle of the 3rd tested digital valve 33
3with tested by this pilot system after the actual value d of the dutycycle of the 3rd tested digital valve 33 that calculates
3' compare, if d
3with d
3' between error in error allowed band, then the 3rd tested digital valve 33 is qualified.
When needing the actual duty cycle of the tested digital valve 34 of test the 4th, first to four tested digital valve energisings, and under making the 4th tested digital valve 34 be operated in voltage rating, normally work within whole current"on"time.And after opening the first tested digital valve 31 by valve core movement to the limit position that control system controls the first tested digital valve 31, spool is rested on this extreme position, make the first tested digital valve 31 be in normally open; After valve core movement to the limit position controlling the second tested digital valve 32 by control system closes the second tested digital valve 32, spool is rested on this extreme position, make the second tested digital valve 32 be in normally off; After opening the 3rd tested digital valve 33 by valve core movement to the limit position of control system control the 3rd tested digital valve 33, spool is rested on this extreme position, make the 3rd tested digital valve 33 be in normally open.
Hydraulic oil is extracted out by oil pump 2 from fuel tank 1, after oil-suction oil filter 11 filters, send in oil inlet passage P, because the second tested digital valve 32 is in normally off, therefore hydraulic oil can only flow into from the filler opening of the often open first tested digital valve 31, oil outlet flows out, and the oil outlet of the first tested digital valve 31 is not only connected with the first cavity of oil hydraulic cylinder 4, and also the filler opening of digital valve 34 tested with the 4th is connected.Therefore, when the 4th tested digital valve 34 is opened, the hydraulic oil flowed out from the oil outlet of the first tested digital valve 31 flows to drainback passage T through this 4th tested digital valve 34 opened, after being filtered, finally flows back in fuel tank 1 by return oil filter 12; When the 4th tested digital valve 34 is closed, the pipeline that hydraulic oil is connected with the first cavity of oil hydraulic cylinder 4 through the oil outlet of the first tested digital valve 31, flows in the first cavity of oil hydraulic cylinder 4, promotes the piston of oil hydraulic cylinder 4, the second piston rod is stretched out.
In the whole working procedure of tested digital valve, the ratio of the cumulative time that the filler opening of tested digital valve is communicated with oil outlet and total current"on"time is called the dutycycle of digital valve, the utility model utilizes the dutycycle of tested digital valve, make system within total current"on"time of tested digital valve, when only having the 4th tested digital valve 34 to close, hydraulic oil can be charged in the first cavity of oil hydraulic cylinder 4 by keeping the first tested digital valve 31 of normally open.And when being filled with hydraulic oil in first cavity of system to oil hydraulic cylinder 4, the piston of oil hydraulic cylinder 4 is pushed, second piston rod stretches out, by the hydraulic oil in the second cavity by discharging with the connecting pipeline of the filler opening keeping the 3rd tested digital valve 33 of normally open, after this part hydraulic oil be discharged enters this 3rd tested digital valve 33 often opened, filtered by return oil filter 12, finally flow back to fuel tank through drainback passage T.
When this pilot system is at t
4it is Q that the first tested digital valve 31 by often opening in time is filled with volume in the first cavity of oil hydraulic cylinder 4
4during the hydraulic oil of (unit is mL, milliliter), according to the measurement of the displacement transducer be arranged on the left of oil hydraulic cylinder 4, the length of returning of first piston bar is h
4, then according to the cross-section area S of oil hydraulic cylinder 4, the cross-section area s of first piston bar
1and the length h that first piston bar is return
1, can Q be drawn
4=Sh
4-s
1h
4.And at t
4in time, when only having the filler opening of the 4th tested digital valve 34 not to be communicated with oil outlet, when also namely the 4th tested digital valve 34 is closed, hydraulic oil can be filled with in the first cavity of oil hydraulic cylinder 4, therefore, at t by system
4in time, the total amount Q by keeping the first tested digital valve 31 of normally open to flow into the hydraulic oil of system "=nq
vt
4, wherein,
N is the rotating speed of oil pump 2, and unit is r/min (rev/min);
Q
vfor the discharge capacity of oil pump 2, unit is mL/r (milliliter/turn).
Due to the t total current"on"time in the 4th tested digital valve 34
4in, the total amount of the hydraulic oil flowed in oil hydraulic cylinder 4 first cavity by the first tested digital valve 31 often opened is Q
4, therefore, at t
4flowed back to total oil mass Q of fuel tank by the 4th tested digital valve 34 in time
4'=Q "-Q
4=nq
vt
4-Q
4.
And the 4th tested digital valve 34 is only when connected state, hydraulic oil just can flow back in fuel tank by the 4th tested digital valve 34 be communicated with, and supposes the cumulative time t be energized in the 4th tested digital valve 34
4in, the cumulative time that the 4th tested digital valve 34 is in connected state is t
4', then according to the 4th tested digital valve 34 oil outlet cross-sectional area A
4, unit is m
2(square metre); The flow velocity v of hydraulic oil in system, unit is m/s (meter per second); Thus draw Q
4'=10
6a
4vt
4', by Q
4'=nq
vt
4-Q
4substitute into, draw nq
vt
4-Q
4=10
6a
4vt
4', then the 4th tested digital valve 34 is in the cumulative time of connected state is t
4'=(nq
vt
4-Q
4)/(10
6a
4v).
According to the definition of digital valve dutycycle, draw the actual duty cycle d of the 4th tested digital valve 34 under voltage rating during normal work
4'=t
4'/t
4=(nq
vt
4-Q
4)/(10
6a
4vt
4).
By the design load d of the dutycycle of the 4th tested digital valve 34
4with tested by this pilot system after the actual value d of the dutycycle of the 4th tested digital valve 34 that calculates
4' compare, if d
4with d
4' between error in error allowed band, then the 4th tested digital valve 34 is qualified.
Use the utility model digital valve pilot system, the actual duty cycle of tested digital valve can be accurately measured, by the error between the theoretical dutycycle of the tested digital valve of comparison and actual duty cycle whether in error allowed band, thus show that whether tested digital valve qualified, for digital valve dispatch from the factory and practical application provides safeguard.Meanwhile, when using the dutycycle of the utility model digital valve pilot system test digital valve, test speed is fast, test efficiency is high, and without the need to readjusting system after changing tested digital valve, flexible to operation, process of the test is less by extraneous factor interference, and test result is accurate.
Claims (6)
1. a digital valve pilot system, it is characterized in that, this digital valve pilot system comprises fuel tank, oil pump, oil inlet passage, four tested digital valve, piston-type hydraulic cylinder and drainback passage, the inlet port of described oil pump is connected with described fuel tank, oil outlet is connected with described oil inlet passage, described oil inlet passage is provided with two branch roads, the filler opening of digital valve tested with first is connected with the filler opening of the second tested digital valve respectively, the described oil outlet of the first tested digital valve is connected with the first cavity of described piston-type hydraulic cylinder, the described oil outlet of the second tested digital valve is connected with the second cavity of described piston-type hydraulic cylinder, and the pipeline that is connected with described piston-type hydraulic cylinder first cavity of the oil outlet of described first tested digital valve is provided with arm, this arm is connected with the filler opening of the 4th tested digital valve, the pipeline that the oil outlet of described second tested digital valve is connected with described piston-type hydraulic cylinder second cavity is provided with arm, this arm is connected with the filler opening of the 3rd tested digital valve, the oil outlet of described 3rd tested digital valve is all connected with one end of described drainback passage with the oil outlet of described 4th tested digital valve, the other end of described drainback passage is connected with described fuel tank.
2. digital valve pilot system according to claim 1, is characterized in that, this digital valve pilot system also comprises displacement transducer, and institute's displacement sensors is in order to measure the displacement of described piston hydraulic cylinder piston rod.
3. digital valve pilot system according to claim 2, is characterized in that, described piston-type hydraulic cylinder is double rod type piston-type hydraulic cylinder.
4. digital valve pilot system according to claim 3, is characterized in that, described digital valve pilot system arranges two displacement transducers, is separately positioned on the both sides of described double rod type piston-type hydraulic cylinder.
5. digital valve pilot system according to claim 1, it is characterized in that, described fuel tank is also provided with oil-suction oil filter and return oil filter, and described oil-suction oil filter is arranged between described fuel tank and described oil pump, and described return oil filter is arranged between described drainback passage and described fuel tank.
6. digital valve pilot system according to claim 1, is characterized in that, described digital valve pilot system adopts electric control system to come the switch of each element in control system and the keying of tested digital valve and adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420394538.0U CN204082777U (en) | 2014-07-16 | 2014-07-16 | Digital valve pilot system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420394538.0U CN204082777U (en) | 2014-07-16 | 2014-07-16 | Digital valve pilot system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204082777U true CN204082777U (en) | 2015-01-07 |
Family
ID=52175500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420394538.0U Active CN204082777U (en) | 2014-07-16 | 2014-07-16 | Digital valve pilot system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204082777U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074841A (en) * | 2014-07-16 | 2014-10-01 | 上海豪高机电科技有限公司 | Digital valve testing system |
-
2014
- 2014-07-16 CN CN201420394538.0U patent/CN204082777U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074841A (en) * | 2014-07-16 | 2014-10-01 | 上海豪高机电科技有限公司 | Digital valve testing system |
| CN104074841B (en) * | 2014-07-16 | 2016-06-08 | 上海豪高机电科技有限公司 | Digital valve pilot system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204716667U (en) | The Development of Hydraulic Synthetic Test-bed of servovalve dynamic and static state performance test | |
| US8826717B2 (en) | Small volume prover apparatus and method for providing variable volume calibration | |
| CN202109938U (en) | Wide range flow measuring device | |
| CN203906448U (en) | Hydraulic component performance testing system | |
| US4606218A (en) | Compact bidirectional meter prover mechanism | |
| CN203114786U (en) | Leakage measuring system | |
| CN107387502B (en) | A kind of integrated test system and method for valve body | |
| CN209743128U (en) | Automatic testing device for improving testing precision of water pump | |
| CN205047582U (en) | Leak testing system in compound pneumatic cylinder | |
| CN103792105A (en) | Experimental device for simulating hydraulic pulses in pipe cleaning process | |
| CN104677440A (en) | System and method for measuring flow rate of fuel gas online | |
| CN104074840B (en) | Digital valve pilot system | |
| CN104596596B (en) | A kind of positive displacement micro liquid flowmeter and its application method | |
| CN104074841B (en) | Digital valve pilot system | |
| CN207921030U (en) | A kind of oil cylinder internal leakage test system | |
| CN204082777U (en) | Digital valve pilot system | |
| CN103047224B (en) | A kind of leakage measuring instrumentation system | |
| CN108730266B (en) | Device and method for measuring internal leakage of hydraulic cylinder | |
| CN204082776U (en) | Digital valve pilot system | |
| CN105697459A (en) | Hydraulic state detection and maintenance vehicle | |
| CN204594616U (en) | For the micro-pressure-difference measuring apparatus of High-Voltage Experimentation | |
| CN202676412U (en) | Shut-off valve leakage rate on-line detection device | |
| CN103597268A (en) | Method for determining condition of piping and sequence controlled sample pump | |
| CN104074842B (en) | Digital valve pilot system | |
| CN202000986U (en) | System for dynamically evaluating pollution of fracturing liquid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |