CN110410384A - A kind of the coming oil measurement indicator and detection method of fluid pressure line - Google Patents
A kind of the coming oil measurement indicator and detection method of fluid pressure line Download PDFInfo
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- CN110410384A CN110410384A CN201910812230.0A CN201910812230A CN110410384A CN 110410384 A CN110410384 A CN 110410384A CN 201910812230 A CN201910812230 A CN 201910812230A CN 110410384 A CN110410384 A CN 110410384A
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- 239000012530 fluid Substances 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 239000000919 ceramic Substances 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 239000003921 oil Substances 0.000 claims description 125
- 239000010720 hydraulic oil Substances 0.000 claims description 14
- 230000035945 sensitivity Effects 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000033001 locomotion Effects 0.000 description 15
- 239000007788 liquid Substances 0.000 description 14
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000003745 diagnosis Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000008447 perception Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Pipeline Systems (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The present invention relates to a kind of coming oil of fluid pressure line measurement indicator and detection methods, belong to mechanical test field.The big chamber end of cylinder body and sealing cylinder cap are threadedly coupled, and charging device is threadedly coupled with sealing cylinder cap, and the small chamber end of small chamber recharging oil device and cylinder body is threadedly coupled；The T-type inner end of T-type Mobile steel leverage piston with cylinder interior is slidably connected, outer end is located at outside cylinder body, one end of Mobile steel leverage is located in the seat sealed on cylinder cap, the other end is located in T-type Mobile steel leverage piston, indicate that the both ends of pipeline are tightly connected with the connecting hole on the big chamber and small chamber of cylinder body respectively, it indicates full of instruction medium in pipeline, annular piezoelectric ceramics are fixedly connected with pressure signal switching piston and are fixedly connected with instruction pipeline opening.Advantage is structure novel, and practicability is higher, and use scope is wider, provides convenience to the maintenance of various fluid pressure lines, saves manpower and material resources, is greatly improved working efficiency in actual production and application.
Description
Technical field
The invention belongs to mechanical test fields, and in particular to engineering machinery hydraulic pipeline coming oil being found out and detecting.
Background technique
With the development of construction machinery, hydraulic technique is widely used.When hydraulic circuit breaks down, field diagnostic
Experience diagnosis, analysis and detection method are generallyd use, maintenance personal utilizes the warp of the theoretical knowledge grasped and accumulation
It tests, with means such as " ask, see, listen, touch, try, look into ", quick diagnosis is out of order reason.This process is with a large amount of disassembly work
Make, oil circuit diagnosis is more complicated, and the cost of overhaul is relatively high, wastes a large amount of manpower and material resources.In maintenance fluid pressure line
In the process, it is difficult to know the flow direction and other parameters of hydraulic oil in the duct, this just brings inconvenience to fault diagnosis.If
One indicating instrument is housed on every oil pipe, discrimination coming oil direction and oil mass can be carried out, will be greatly reduced maintenance cost, creation can
See economic benefit.
Summary of the invention
The present invention provides the coming oil measurement indicator and detection method of a kind of fluid pressure line, with solve presently, there are in liquid
Drive test amount is pushed back in the process with a large amount of dismantlement work, and oil circuit diagnosis is more complicated, and the cost of overhaul is relatively high, wastes
The problem of a large amount of manpower and material resources.
The technical solution adopted by the present invention is that: including T-type Mobile steel leverage piston, small chamber recharging oil device, cylinder body supports bullet
Flexible deformation plug is isolated in spring, Mobile steel leverage, indicates that pipeline, hydraulic oil indicate medium, annular piezoelectric ceramics, pressure signal
Switching piston, reset spring seal cylinder cap, charging device；Wherein the big chamber end of cylinder body and sealing cylinder cap are threadedly coupled, filling liquid dress
It sets and is threadedly coupled with sealing cylinder cap, the small chamber end of small chamber recharging oil device and cylinder body is threadedly coupled；The T of T-type Mobile steel leverage piston
Type inner end with cylinder interior is slidably connected, outer end is located at outside cylinder body, cylinder interior is divided into two chambers of size, hydraulic oil is distinguished
Full of two chambers, one end of Mobile steel leverage is located in the seat sealed on cylinder cap, the other end is located at T-type Mobile steel leverage piston
In, support spring is located in Mobile steel leverage piston and is socketed in outside the Mobile steel leverage other end；Indicate the both ends difference of pipeline
It is tightly connected with the connecting hole on the big chamber and small chamber of cylinder body, two isolation flexible deformation plugs are located in connecting hole, simultaneously
It is slidably connected with connecting hole, indicates to fix and connect full of instruction medium, annular piezoelectric ceramics and pressure signal switching piston in pipeline
It connects and is fixedly connected with instruction pipeline opening.
The support spring is consistent with the stiffness coefficient of reset spring.
There is step below the connecting hole of cylinder body.
Current sensitive meter is fixedly connected with instruction pipeline opening.
The gauge head set of gauge head system and the extension end of T-type Mobile steel leverage piston are socketed；
The gauge head system includes measuring head, gauge head bar and gauge head set, and wherein measuring head is threadedly coupled with gauge head bar, gauge head
Bar is connect with gauge head external threading.
The both ends of connector and gauge head installing pipe are threadedly coupled, fixed at the gaging hole on sealing guide rail and gauge head installing pipe to connect
It connects, Follow-up seal baffle is slidably connected with sealing guide rail, and the gauge head bar of gauge head system is fixedly connected with Follow-up seal baffle, gauge head
The measuring head of system is located in gauge head installing pipe, and pipe collar and locking assembly is supported to be threadedly coupled, and support pipe collar is pacified with gauge head respectively
Tubulature is fixedly connected with cylinder body.
Detection method of the invention, including the following steps:
Step 1: the tested pipeline of understanding carrys out oil mass range qmin~qmax, determine detection ratio；Y=qmax/qmin；
Step 2: the least resolution for determining the coming oil measurement indicator of fluid pressure line is q0, it is desirable thatIt is maximum
Detection limit is qmax, select serial x*y≤1 of suitable design, i.e. the muting sensitivity K of the coming oil measurement indicator of fluid pressure lineLWith
Highly sensitive KRMeet KL/KR=x selects suitable range ability I0~I3, so that sensitive galvanometer is in qmin~qmaxPipeline
Come in oil mass ranges without departing from range；
Step 3: the coming oil measurement indicator of fluid pressure line is mounted in tested pipeline；
Step 4: reading, if registration i works as indication range in I0~I1When, show side coming oil, carrying out oil mass isI.e.
When indication range is in I2~I3When, show that other side coming oil carrys out oil mass and is
The present invention use enclosure space hydraulic cushion principle, be mounted on hydraulic pipeline, can show coming oil direction and
Carry out oil mass.It is provided with test head system, Mobile steel leverage, cylinder body, instruction pipeline, indicator, gauge head installing pipe in device, passes through
Effect of the hydraulic oil to measuring head in pipeline pushes Mobile steel leverage mobile, to generate oil liquid pressure, indicator registration it is big
Small indicate carrys out oil mass, and can judge coming oil side according to the registration range of the moving direction of indicator solution or indicator
To.
When oil liquid comes from a direction of pipeline, pushes mobile steel pole movement to carry out compression reseting spring, generate big chamber
Indicator in lower pressure compression instruction pipeline generates fine motion；When oil liquid comes from another direction of pipeline, movement is pushed
Steel pole stretches reset spring, and small chamber at this moment can be made to generate elevated pressures, and the indicator solution in compression instruction pipeline generates opposite direction
Fine motion transmit energy, no matter be which direction coming oil in pipeline, can be judged by the fine motion direction of indicator solution, and refer to
Show that the registration of device shows also coming oil direction and carrys out oil mass.
It is an advantage of the invention that structure novel, the mode that cylinder body uses big chamber and small chamber to combine, there is 3 advantages, first is that
Relative to straight barrel type cylinder body, it can reduce pipe friction influence, reduce water attack vibration；Second is that can be easy to distinguish coming oil side
To avoiding the coincidence of detection gradient when realizing pipeline or so coming oil, it can the excessive problem of the small chamber bar diameter of compensating cylinder, it is real
The high sensitivity and muting sensitivity of existing pipeline oil drive test amount indicator；Third is that realize pipeline oil drive test amount indicator overload protection,
When come oil pressure it is excessive when, push mobile leverage that cylinder body size chamber is made be connected to realization rapidly and be depressured.
There is indicator in instruction pipeline, wherein indicator has unidirectional flow, i.e. indicator can only be in instruction pipeline
Flowing cannot flow out instruction pipe；When Mobile steel leverage is mobile, the pressure of generation can make indicator generate corresponding movement, into
And the logical oil mass and direction, the fine motion of indicator in indicator meeting display pipes may indicate that flow direction oily in pipeline.
A kind of pipeline oil drive test amount indicator principle proposed by the invention is reliable, and easy to operate and portable capability is strong, solution
Determined more complicated for the repair method of fluid pressure line at present, and the cost of overhaul is relatively high, waste a large amount of manpower with
The problem of material resources.
Practicability of the present invention is higher, and use scope is wider, can provide convenience to the maintenance of various fluid pressure lines, very
Manpower and material resources are saved in big degree, is greatly improved working efficiency in actual production and application.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the II1 partial enlarged view of Fig. 1；
Fig. 3 is the II2 partial enlarged view of Fig. 1；
Fig. 4 is the structural schematic diagram of present invention instruction pipeline；
Fig. 5 is annular piezoelectric ceramics stress diagram of the present invention；
Fig. 6 is the schematic diagram that the present invention is mounted in tested pipeline；
Fig. 7 a is the structural schematic diagram of gauge head system of the present invention；
Fig. 7 b is Fig. 7 a top view；
Fig. 7 c is Fig. 7 b left view；
Fig. 8 is the structural schematic diagram of gauge head system of the present invention and sensitive galvanometer；
Fig. 9 is measurement indicator system Amesim simulating, verifying model；
Figure 10 is original state coming oil signal graph；
Figure 11 is indicator simulation result diagram.
Specific embodiment
As shown in Figure 1, including T-type Mobile steel leverage piston 1, small chamber recharging oil device 2, cylinder body 3, support spring 4, Mobile steel
Flexible deformation plug 6 is isolated in leverage 5, indicates that pipeline 7, hydraulic oil 8 indicate that medium 9, annular piezoelectric ceramics 10, pressure signal turn
Piston 11 is changed, reset spring 12 seals cylinder cap 13, charging device 14；Wherein: the big chamber end of cylinder body 3 and sealing 13 screw thread of cylinder cap
Cylinder body sealing is realized in connection, and charging device 14 is threadedly coupled with sealing cylinder cap 13, realizes big chamber repairing and filling liquid, small chamber repairing
The small chamber end of device 2 and cylinder body 3 is threadedly coupled；The T-type inner end of T-type Mobile steel leverage piston 1 connect with 3 internal slide of cylinder body,
Outer end is located at outside cylinder body 3, and two chambers of size will be divided into inside cylinder body 3, and hydraulic oil 8 is respectively filled with two chambers, mobile steel pole
Be 5 one end be located at sealing cylinder cap 13 on seat in, the other end be located in T-type Mobile steel leverage piston 1, support spring 4 is located at
In Mobile steel leverage piston 1 and it is socketed in outside 5 other end of Mobile steel leverage；Indicate that the both ends of pipeline 7 are big with cylinder body 3 respectively
Connecting hole 3-1 on chamber and small chamber is tightly connected, two isolation flexible deformation plugs 6 be located in connecting hole 3-1 and with company
Hole 3-1 is met to be slidably connected, as shown in fig. 7, instruction pipeline 7 in full of instruction medium 9, as shown in Fig. 2, annular piezoelectric ceramics 10 with
Pressure signal switching piston 11 is fixedly connected and is fixedly connected with instruction 7 opening 7-1 of pipeline.
The support spring 4 is consistent with the stiffness coefficient of reset spring 12.
As shown in figure 3, having step 3-2 below the connecting hole 3-1 of cylinder body 3.
As shown in fig. 6, current sensitive meter 23 is fixedly connected with instruction 7 opening 7-1 of pipeline.
As shown in figure 8, the gauge head set 20-3 of gauge head system 20 and the extension end of T-type Mobile steel leverage piston 1 are socketed；
As shown in fig. 7, the gauge head system 20 includes measuring head 20-1, gauge head bar 20-2 and gauge head cover 20-3, wherein surveying
Examination head 20-1 is threadedly coupled with gauge head bar 20-2, and gauge head bar 20-2 is threadedly coupled with gauge head set 20-3.
As shown in fig. 6, the both ends of connector 16 and gauge head installing pipe 17 are threadedly coupled, sealing guide rail 18 and gauge head installing pipe 17
On gaging hole at be fixedly connected, Follow-up seal baffle 19 with sealing guide rail 18 be slidably connected, the gauge head bar 20-2 of gauge head system 20
It is fixedly connected with Follow-up seal baffle 19, the measuring head 20-1 of gauge head system 20 is located in gauge head installing pipe 17, supports pipe collar 21
It is threadedly coupled with locking assembly 22, support pipe collar 21 is fixedly connected with gauge head installing pipe 17 and cylinder body 3 respectively.
The present invention will be further described with reference to the accompanying drawing.
As shown in Figure 1, Mobile steel leverage piston 1, support spring 4 and Mobile steel leverage 5, realize the perception of coming oil, branch
It is consistent with the requirement of the stiffness coefficient of reset spring 12 to support spring 4, has hydraulic oil 8 as pressure transmission medium in cylinder body；Ring-type pressure
Electroceramics 10 and pressure signal switching piston 1 realize the conversion of physical signal to electric signal or visual signals；Indicate pipeline 7
It is interior full of instruction medium 9, as shown in Figure 4, it is desirable that its transparent observable, and want high pressure resistant impact resistance, instruction medium with it is hydraulic
Oil isolation needs to be isolated flexible deformation plug 6, so that energy exchange occurs for hydraulic oil and instruction medium without mass exchange；
The effect of charging device 14 is the The hydraulic oil changed in cylinder body, is filled with that liquid multi-cylinder compressive strength is big, and vice versa and (changes and fill
Liquid measure can change coming oil instruction range).Hydraulic oil 8 and instruction medium 9 require to be different, the former only serves the biography of energy
The effect of passing, and the latter will also have indicative function to observe.
Mobile steel leverage 5 with side-to-side movement, can realize the coming oil detection of pipeline both direction in cylinder body；Cylinder body 3 and close
It seals cylinder cap 13 to be threadedly coupled, realizes cylinder body sealing；Sealing cylinder cap 13 is threadedly coupled with charging device 14, is realized big chamber repairing and is filled
Liquid.
As shown in figure 3, isolation flexible deformation plug 6 is located at cylinder body connecting hole 3-1 and instruction line entry, realize hydraulic
The isolation of oil 8 and instruction medium 9；And there is step 3-2 below cylinder body connecting hole 3-1, so that isolation flexible deformation plug can only
Movement is generated to instruction pipeline inboard, hydraulic fluid pressure variation is passed to rapidly instruction medium, then pushed and pressed by instruction medium
Force signal switching piston 11.
As shown in Fig. 2, pressure signal switching piston 11 and 10 interaction of annular piezoelectric ceramics are pressure conversion at charge
Signal carrys out oil mass eventually by the instruction of current sensitive meter 23, sensitive galvanometer 23 passes through annular piezoelectric ceramics as shown in Figure 5,6
10 polarization direction extraction wires are connected thereto, and realize closed circuit.
For installation as shown in fig. 6, being expanded joint between tested consistent lubricant pipe 15 and connector 16, guide rail 18 and Follow-up seal are sealed
Baffle 19 realizes sealing of the gauge head system 20 at gauge head installing pipe 17, meanwhile, Follow-up seal baffle follow gauge head system along
Guide rail is sealed, i.e. the axial movement of gauge head installing pipe 17 realizes coming oil perception.
Working principle: it when oil liquid comes from a direction of pipeline, pushes mobile steel pole movement to carry out compression reseting spring, makes
The indicator that big chamber generates in lower pressure compression instruction pipeline generates fine motion；When oil liquid comes from another direction of pipeline,
It pushes mobile steel pole to stretch reset spring, small chamber at this moment can be made to generate elevated pressures, the indicator solution in compression instruction pipeline produces
Energy is transmitted in the fine motion of raw opposite direction, no matter is which direction coming oil in pipeline, can by the fine motion direction of indicator solution come
Judgement, and the registration of indicator shows also coming oil direction and carrys out oil mass.
Detection method of the invention, including the following steps:
Step 1: the tested pipeline of understanding carrys out oil mass range qmin~qmax, determine detection ratio；Y=qmax/qmin；
Step 2: the least resolution for determining the coming oil measurement indicator of fluid pressure line is q0, it is desirable thatIt is maximum
Detection limit is qmax, select serial x*y≤1 of suitable design, i.e. the muting sensitivity K of the coming oil measurement indicator of fluid pressure lineLWith
Highly sensitive KRMeet KL/KR=x selects suitable range ability I0~I3, so that sensitive galvanometer is in qmin~qmaxPipeline
Come in oil mass ranges without departing from range；
Step 3: the coming oil measurement indicator of fluid pressure line is mounted in tested pipeline；
Step 4: reading, if registration i works as indication range in I0~I1When, show side coming oil, carrying out oil mass isI.e.
When indication range is in I2~I3When, show that other side coming oil carrys out oil mass and is
The present invention is further verified by relative theory derivation below.
In the duct, side coming oil and other side coming oil act on the power F size on gauge head for similarly carrying out oil mass q
It is equal.
If pushing mobile leverage to be moved to the left from pipeline side coming oil；If pushing movement from pipeline other side coming oil
Leverage moves right.Oil mass is come for identical pipeline, if when from a direction coming oil, production when mobile leverage being pushed to be moved to the left
Raw low-pressure is p1If pushing mobile leverage to generate high pressure when being moved to the left when from another direction coming oil is p2, then they
Meet following relationship:
F=p1*A1=p2*A2................................(1)
In formula:
p1--- cylinder body left chamber generates pressure；A1--- the equivalent cross section of cylinder body left chamber；
p2--- cylinder body right chamber generates pressure；A2--- cylinder body right chamber cross section.
Then have according to straight tube cylinder body:
D --- cylinder body left chamber diameter；D --- cylinder body right chamber bar diameter；
X --- left and right cavity pressure ratio.
If making x sufficiently small, need d/D sufficiently large.I.e. bar diameter is similar with chamber diameter, this bad realization.Then using increasing
The method of left side cylinder barrel diameter is added to reduce pressure ratio.Making it easy to detection is that pipeline side coming oil or the pipeline other side are come
Oil.
Assuming that coming oil detector least resolution is q0, maximum detection limit is qmax, detect and compare y=qmax/q0.Pipeline side
When coming oil, the pressure that corresponding left chamber generates is p10、p1max；When the coming oil of the pipeline other side, the pressure of corresponding left chamber generation
It is respectively p20、p2max；There are following relationships between them:
Pressure ratio x is rationally designed, so that:
p1max≤p20......................................(4)
This just need detection can identify in the range of x it is the smaller the better, then measurement indicator design condition for x*y≤
1, in fact, reducing x by the reduced diameter portion diameter (changing volume) for increasing variable diameter cylinder.In this case, detection pressure is less than
p1max, it is pipeline side coming oil with regard to explanation；It detects pressure and is greater than p1maxIt otherwise is exactly pipeline other side coming oil.By building coming oil
Pipeline oil drive test amount indicator simulation model such as Fig. 9, in the case where given coming oil signal such as Figure 10, indicator for displaying is divided into two
A ladder is as shown in figure 11: the curve of downside band circles mark indicates that leverage 1 is moved to the left the signal results of generation；Downside band three
The curve red curve of corner mark indicates that leverage 1 moves right the signal results of generation, and boundary pressure is 1.004935bar；
There is the good linearity and distinguishing as seen from the figure.
Indicator includes annular piezoelectric ceramics 10 and its pressure signal switching piston 11, using piezoelectric material lead zirconate titanate
There is charge, quantity of electric charge Q perpendicular to the upper and lower surfaces of polarization direction if Fig. 5 is in its polarization direction z stress in PZT-5z
With FzActive force is directly proportional, i.e.,
Qz=d33Fz......................................(5)
In formula:
d33--- piezoelectric ceramics piezoelectric modulus, d33=600；Fz--- active force.
Annular piezoelectric ceramics 10 are demarcated, pass through pressure signal switching piston 11, p in different pressures10、p1max p20、
p2maxWhen acting on annular piezoelectric ceramics 10, the charge of generation is respectively Q0、Q1、Q2、Q3, meet Q between them0< Q1≤Q2
< Q3, detection signal changes linearly similar with Figure 11 simulation result in respective gradient scope.
Then quantity of electric charge Q0、Q1、Q2、Q3Respectively with p10、p1max p20、p2maxActive force is directly proportional, i.e.,
In formula:
d33--- piezoelectric ceramics piezoelectric modulus, d33=600；A --- it is effective between annular piezoelectric ceramics (10) and conversion
Active area.
So, from pipeline side coming oil, carry out oil mass q0~qmaxThe quantity of electric charge Q generated with annular piezoelectric ceramics0
~Q1It corresponds；From pipeline other side coming oil, carry out oil mass q0~qmaxThe quantity of electric charge Q generated with annular piezoelectric ceramics2~Q3One
One is corresponding, the sensitive galvanometer 23 for the suitable range that piezoelectric ceramics connects, such as Fig. 6.It can show its value.Quantity of electric charge Q0、Q1、
Q2、Q3The registration respectively corresponded in sensitive galvanometer is respectively I0、I1、I2、I3。
In formula:
K --- sensitive galvanometer sensitivity.
Then sensitive galvanometer registration and coming oil magnitude relation such as following formula
In formula:
KL--- (pipeline side coming oil keeps coming oil indicator left to the muting sensitivity of the coming oil measurement indicator of fluid pressure line
The big chamber in side generates coming oil indicator sensitivity when high pressure)；KR--- the high sensitivity of the coming oil measurement indicator of fluid pressure line
(pipeline other side coming oil makes coming oil indicator sensitivity when small chamber generation high pressure on the right of coming oil indicator, and meets KL/KR
=x)；q00--- oil mass minimum q is carried out in pipeline side0；q0max--- oil mass maximum q is carried out in pipeline sidemax；q10--- pipeline
Oil mass minimum q is carried out in the other side0；q1max--- oil mass maximum q is carried out in pipeline sidemax。
Since then, when measuring indicator to meet design condition is x*y≤1, the registration for measuring indicator can not only be shown
Pipeline carrys out oil mass, and being capable of display direction.I.e. when indication range is in I0~I1When, show side coming oil；I.e. when indication range exists
I2~I3When, show other side coming oil.After demarcating sensitive galvanometer according to 8 formulas, the registration size of flowmeter can characterize coming oil
Amount, the gradient of flowmeter registration can characterize coming oil direction.When registration i indication range is in I0~I1When, show that side is come
Oil, carrying out oil mass isI.e. when indication range is in I2~I3When, show that other side coming oil carrys out oil mass and is
It can be simultaneously the The hydraulic oil changed in cylinder body by charging device 7, effect, to change measuring range.When filling
When liquid device filling liquid, compression stiffness enhances in cylinder, and measuring range becomes larger；When charging device releases liquid, compression stiffness subtracts in cylinder
Few, measuring range becomes smaller.That is it can change q by changing filling amount0~qmaxMeasurement range.
In fact, when knowing that pipeline carrys out oil mass range, so that it may select the pipeline oil of suitable design condition (x*y≤1)
Drive test amount indicator and suitable fliud flushing amount；So that pipeline oil drive test amount indicator can either distinguish coming oil direction, and can show
Carry out oil mass.
Claims (8)
1. a kind of coming oil of fluid pressure line measures indicator, it is characterised in that: including T-type Mobile steel leverage piston, small chamber repairing
Flexible deformation plug is isolated in device, cylinder body, support spring, Mobile steel leverage, indicates that pipeline, hydraulic oil indicate medium, cyclic annular
Piezoelectric ceramics, pressure signal switching piston, reset spring seal cylinder cap, charging device；The wherein big chamber end of cylinder body and sealing cylinder
Lid is threadedly coupled, and charging device is threadedly coupled with sealing cylinder cap, and the small chamber end of small chamber recharging oil device and cylinder body is threadedly coupled；T-type
The T-type inner end of Mobile steel leverage piston with cylinder interior is slidably connected, outer end is located at outside cylinder body, cylinder interior is divided into size
Two chambers, hydraulic oil are respectively filled with two chambers, and one end of Mobile steel leverage is located in the seat sealed on cylinder cap, the other end is located at
In T-type Mobile steel leverage piston, support spring is located in Mobile steel leverage piston and is socketed in outside the Mobile steel leverage other end；
Indicate that the both ends of pipeline are tightly connected with the connecting hole on the big chamber and small chamber of cylinder body respectively, two isolation flexible deformation plugs point
It Wei Yu not be slidably connected in connecting hole and with connecting hole, indicate to believe in pipeline full of instruction medium, annular piezoelectric ceramics and pressure
Number switching piston is fixedly connected and is fixedly connected with instruction pipeline opening.
2. a kind of coming oil of fluid pressure line according to claim 1 measures indicator, it is characterised in that: the support spring
It is consistent with the stiffness coefficient of reset spring.
3. a kind of coming oil of fluid pressure line according to claim 1 measures indicator, it is characterised in that: the connecting hole of cylinder body
Lower section have step.
4. the coming oil of fluid pressure line according to claim 1 a kind of measures indicator, it is characterised in that: current sensitive meter with
Instruction pipeline opening is fixedly connected.
5. a kind of coming oil of fluid pressure line according to claim 1 measures indicator, it is characterised in that: the survey of gauge head system
The extension end of headgear and T-type Mobile steel leverage piston is socketed.
6. a kind of coming oil of fluid pressure line according to claim 5 measures indicator, it is characterised in that: the gauge head system
Including measuring head, gauge head bar and gauge head set, wherein measuring head is threadedly coupled with gauge head bar, and gauge head bar is connect with gauge head external threading.
7. a kind of coming oil of fluid pressure line according to claim 1 measures indicator, it is characterised in that: connector and gauge head peace
The both ends of tubulature are threadedly coupled, and are sealed and are fixedly connected at guide rail and the gaging hole in gauge head installing pipe, Follow-up seal baffle and sealing
Guide rail is slidably connected, and the gauge head bar of gauge head system is fixedly connected with Follow-up seal baffle, and the measuring head of gauge head system is located at gauge head
In installing pipe, pipe collar and locking assembly is supported to be threadedly coupled, support pipe collar is fixedly connected with gauge head installing pipe and cylinder body respectively.
8. the detection method of the coming oil measurement indicator using a kind of fluid pressure line as described in claim 1~7 is any, special
Sign is, including the following steps:
Step 1: the tested pipeline of understanding carrys out oil mass range qmin~qmax, determine detection ratio；Y=qmax/qmin；
Step 2: the least resolution for determining the coming oil measurement indicator of fluid pressure line is q0, it is desirable thatMaximum detection
Amount is qmax, select serial x*y≤1 of suitable design, i.e. the muting sensitivity K of the coming oil measurement indicator of fluid pressure lineLAnd Gao Ling
Sensitivity KRMeet KL/KR=x selects suitable range ability I0~I3, so that sensitive galvanometer is in qmin~qmaxThe coming oil of pipeline
It measures in ranges without departing from range；
Step 3: the coming oil measurement indicator of fluid pressure line is mounted in tested pipeline；
Step 4: reading, if registration i works as indication range in I0~I1When, show side coming oil, carrying out oil mass isI.e. when aobvious
Demonstration is trapped among I2~I3When, show that other side coming oil carrys out oil mass and is
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