CN108374816A - Leak detection apparatus and the detection method using the device in a kind of hydraulic pressure - Google Patents
Leak detection apparatus and the detection method using the device in a kind of hydraulic pressure Download PDFInfo
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- CN108374816A CN108374816A CN201810180556.1A CN201810180556A CN108374816A CN 108374816 A CN108374816 A CN 108374816A CN 201810180556 A CN201810180556 A CN 201810180556A CN 108374816 A CN108374816 A CN 108374816A
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- concavees lens
- plunger case
- plane mirror
- detection
- piston rod
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- 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
- F15B19/005—Fault detection or monitoring
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses the detection methods of leak detection apparatus in a kind of hydraulic pressure and the use device, the detection device includes plunger case, plane mirror, hinged seat, concavees lens, light spot position sensitivity device and semiconductor laser, detection mouth is offered on the plunger case, it is provided with resetting spring in the rod chamber of plunger case, described plane mirror one end is hinged with hinged seat, the piston rod of the other end and plunger case is hinged, the rotation center that plane mirror is rotated around hinged seat, the center of concavees lens and the luminous point of semiconductor laser are in same level, hinged seat, concavees lens, light spot position sensitivity device and semiconductor laser are arranged side by side successively.In detection process, it converts detection limit to by the volume of internal leakage the displacement of piston rod, is then amplified L twice by plane mirror and concavees lens, finally the value of magnification by light spot position sensitivity units test to the end, to be back-calculated to obtain the volume of internal leakage, precision and efficiency of detecting is improved.
Description
Technical field
The present invention relates to signal detecting technical fields, and in particular to leak detection apparatus and uses the device in a kind of hydraulic pressure
Detection method.
Background technology
Internal leakage be weigh hydraulic cylinder quality an important indicator, be judge hydraulic cylinder quality important evidence it
One.Before manufacture and during use, in order to judge whether hydraulic cylinder qualified or normal use, is required for being let out in hydraulic cylinder
Leak into the quantitative detection of row.The internal leakage of hydraulic cylinder belongs to tiny leakage, and the current measurement to hydraulic cylinder interior leakage leakage is not often very smart
Really.
Invention content
In view of this, the object of the present invention is to provide the detection sides of leak detection apparatus in a kind of hydraulic pressure and the use device
Method, to improve the precision to leak detection in hydraulic pressure.
The present invention is solved the above problems by following technological means：Leak detection apparatus in a kind of hydraulic pressure, including plunger case,
Plane mirror, hinged seat, concavees lens, light spot position sensitivity device and semiconductor laser, offer on the plunger case with
The detection mouth of the rodless cavity connection of plunger case, is provided with resetting spring, described plane mirror one end in the rod chamber of plunger case
It is hinged with hinged seat, it is the piston rod of the other end and plunger case is hinged, and plane mirror is rotated around hinged seat rotation center, recessed
The center of mirror and the luminous point of semiconductor laser are in same level, hinged seat, concavees lens, light spot position sensitivity device
And semiconductor laser is arranged side by side successively.
Further, distance and concavees lens center of the rotation center that plane mirror is rotated around hinged seat to concavees lens center
Distance to light spot position sensitivity device is equal.
A kind of detection method using above-mentioned detection device includes the following steps：
1) field condition is detected in root, arranges each device of detection device as required, and by oil pipe by test solution
The oil leakaging port a of cylinder pressure and the detection mouth of plunger case connect；
2) to the stable pressure P of the pressurization mouth b inputs of tested hydraulic cylinder；Under the action of pressure P, volume is the hydraulic pressure of V
Cylinder internal leakage flows into plunger case, and fluid acts on the rodless cavity of plunger case, overcomes motion inertia force, frictional force and spring force, drives
The piston rod of dynamic plunger case travels forward distance L so that is initially in promotion of the plane mirror in piston rod of vertical state
Under, it is rotated around rotation center O, semiconductor laser sends out incident ray, and incident ray is along horizontal direction directive concavees lens
Center, when by concavees lens, the direction of incident ray is constant, continues the rotation center on directive plane mirror, and generates anti-
Light is penetrated, reflection light passes through the refraction of concavees lens, shifts upwards, final refracted light is fallen in light spot position sensitivity device
On, light spot position sensor detects the position of fringence drop point, signal is transmitted to computer, computer shows the height H of luminous point；
3) according to optical principle it is found thatWherein, L is the piston of plunger case
The displacement of bar；R is the vertical range of piston rod and rotary middle point O；M between concavees lens and rotary middle point O it is horizontal away from
From；Horizontal distances of the N between light spot position sensitivity device and concavees lens；F is the focal length of concavees lens；
4) according to the displacement L of H pushing piston-rods, leakage rate V=LS is finally obtained；Wherein S is the sectional area of piston rod.
Further,Horizontal distances of the wherein g between rotation center O and light spot position sensitivity device.
Further,
Further, if do not have leakage rate, the height of luminous point is Δ H, also according to optical principle,
The displacement of piston rod, final tiny leakage amount are when wherein Δ L is no leakage rate：V=S (L- Δ L) is i.e.：
Beneficial effects of the present invention：The present invention discloses leak detection apparatus and the detection side using the device in a kind of hydraulic pressure
Method, the detection device include plunger case, plane mirror, hinged seat, concavees lens, light spot position sensitivity device and semiconductor laser
Device offers detection mouth on the plunger case, resetting spring, described plane mirror one end is provided in the rod chamber of plunger case
It is hinged with hinged seat, it is the piston rod of the other end and plunger case is hinged, and plane mirror is rotated around hinged seat rotation center, recessed
The center of mirror and the luminous point of semiconductor laser are in same level, hinged seat, concavees lens, light spot position sensitivity device
And semiconductor laser is arranged side by side successively.In detection process, detection limit is converted to piston rod by the volume of internal leakage
Displacement, then L is amplified twice by plane mirror and concavees lens, finally to the end by light spot position sensitivity units test
Value of magnification improve precision and efficiency of detecting to be back-calculated to obtain the volume of internal leakage.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural schematic diagram of detection device of the present invention.
Specific implementation mode
Below with reference to attached drawing, the present invention is described in detail, as shown in Figure 1：The present invention provides let out in a kind of hydraulic pressure
Reveal detection device, including plunger case 2, plane mirror 3, hinged seat, concavees lens 4, light spot position sensitivity device 5 and semiconductor swash
Light device 6, the plunger case include cylinder body and piston rod, and the detection being connected to the rodless cavity of plunger case is offered on the cylinder body
Mouthful, resetting spring is provided in the rod chamber of plunger case, described plane mirror one end is hinged with hinged seat, the other end and piston
Bar is hinged, rotation center O, the center of concavees lens and the luminous point of semiconductor laser that plane mirror is rotated around hinged seat
In same level, hinged seat, concavees lens, light spot position sensitivity device and semiconductor laser are arranged side by side successively, put down
Distances and concavees lens center to light spot position sensitivity device of the rotation center O that face speculum is rotated around hinged seat to concavees lens center
The distance of part is equal.
A kind of detection method using above-mentioned detection device includes the following steps：
1) field condition is detected in root, arranges each device of detection device as required, and by oil pipe by test solution
The oil leakaging port a of cylinder pressure 1 is connect with the detection mouth of plunger case 2；
2) to the stable pressure P of the pressurization mouth b inputs of tested hydraulic cylinder 1；Under the action of pressure P, volume is the hydraulic pressure of V
Cylinder internal leakage flows into plunger case 2, and fluid acts on the rodless cavity of plunger case, overcomes motion inertia force, frictional force and spring force, drives
The piston rod of dynamic plunger case travels forward distance L so that is initially in promotion of the plane mirror in piston rod of vertical state
Under, it is rotated around rotation center O, semiconductor laser 6 sends out incident ray, and incident ray is along horizontal direction directive concavees lens 4
Center, when by concavees lens 4, the direction of incident ray is constant, continues the rotation center on directive plane mirror 3, and produce
Raw reflection light, reflection light pass through the refraction of concavees lens 4, shift upwards, final refracted light falls quick in light spot position
On inductor component (PSD) 5, light spot position sensor (PSD) 5 detects the position of fringence drop point, and signal is transmitted to computer, computer
Show the height H of luminous point；
3) according to optical principle it is found thatWherein, L is the work of plunger case 2
The displacement of stopper rod；R is the vertical range of piston rod and rotary middle point O；Levels of the M between concavees lens 4 and rotary middle point O
Distance；Horizontal distances of the N between light spot position sensitivity device (PSD) 5 and concavees lens 4；F is the focal length of concavees lens；
4) according to the displacement L of H pushing piston-rods, leakage rate V=LS is finally obtained；Wherein S is the sectional area of piston rod.
When detection device limited width, that is, work asWhen, wherein g is rotation center O and light spot position sensitivity device
(PSD) horizontal distance between 5, H are maximized,
Amplification factor is
As shown from the above formula, amplification factor is related with four variables：g、L、f、R.Wherein g is bigger, and amplification factor n is got over
Greatly, but it is convenient for actual use, take 800mm；L is the displacement of test mode lower piston rod, by hydraulic cylinder interior leakage leakage quantity
It determines；F and R are smaller, and amplification factor n is bigger.But in fact, focal length also determines the height of concavees lens 4 indirectly, if concavees lens
The too small reflected light of focal length will not pass through concavees lens 4.Ensure that reflection light can pass through concavees lens, then needs to meet the following conditionsTake boundary condition, that is,Substituting into above-mentioned formula can obtain
Amplification factor
When：Amplification factor n=720 when g=800, R=5, L=1；
Amplification factor n=560 when g=800, R=10, L=1；
It can be seen that the device can significantly amplify it is measured.
At the end of detection, the piston rod in micro- diameter cylinder 2 resets under the force of a spring, plane mirror 3
Also return to initial vertical state.Theoretically, when not having leakage rate, plane mirror 3 will be in vertical state, finally
Refracted light can fall back on the luminous point of semiconductor laser 6.In fact, due to manufacture, assembly, using fatigue etc., do not having
When having leakage rate, plane mirror 3 will not be in complete vertical state.Thus final refracted light can deviate scheduled
0 value point (luminous point of semiconductor laser 6), and can fall on light spot position detection device (PSD) 5.If there is no leakage rate
, the height of luminous point is Δ H, also according to optical principle,
The displacement of piston rod when wherein Δ L is no leakage rate,
Final tiny leakage amount is：V=S (L- Δ L)
I.e.：
The invention has the advantages that：
1. tiny leakage can be detected, world's blank is filled up；
2. of the invention will significantly can amplify internal leakage, thus have high accuracy of detection；Also improve inspection simultaneously
Survey efficiency.
3. amplified by optical instrument, thus error is small.
Finally illustrate, the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although with reference to compared with
Good embodiment describes the invention in detail, it will be understood by those of ordinary skill in the art that, it can be to the skill of the present invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the right of invention.
Claims (6)
1. leak detection apparatus in a kind of hydraulic pressure, it is characterised in that：Including plunger case, plane mirror, hinged seat, concavees lens,
Light spot position sensitivity device and semiconductor laser offer the detection being connected to the rodless cavity of plunger case on the plunger case
Mouthful, resetting spring is provided in the rod chamber of plunger case, described plane mirror one end is hinged with hinged seat, the other end and plunger
The piston rod of cylinder is hinged, the center for the rotation center, concavees lens that plane mirror is rotated around hinged seat and semiconductor laser
Luminous point be in same level, hinged seat, concavees lens, light spot position sensitivity device and semiconductor laser are successively side by side
Arrangement.
2. leak detection apparatus in hydraulic pressure according to claim 1, it is characterised in that：Plane mirror is rotated around hinged seat
Rotation center to concavees lens center distance it is equal at a distance from concavees lens center to light spot position sensitivity device.
3. a kind of detection method using the detection device as described in claim 1-2 any one, which is characterized in that including as follows
Step：
1) field condition is detected in root, arranges each device of detection device as required, and by oil pipe by tested hydraulic cylinder
Oil leakaging port a and plunger case detection mouth connect；
2) to the stable pressure P of the pressurization mouth b inputs of tested hydraulic cylinder；Under the action of pressure P, volume is in the hydraulic cylinder of V
Leakage flows into plunger case, and fluid acts on the rodless cavity of plunger case, overcomes motion inertia force, frictional force and spring force, drives column
The piston rod of plug cylinder travels forward distance L so that the plane mirror of vertical state is initially under the promotion of piston rod, around
Rotation center O rotation, semiconductor laser send out incident ray, incident ray along horizontal direction directive concavees lens center,
When by concavees lens, the direction of incident ray is constant, continues the rotation center on directive plane mirror, and generate reflected light
Line, reflection light pass through the refraction of concavees lens, shift upwards, and final refracted light is fallen on light spot position sensitivity device,
Light spot position sensor detects the position of fringence drop point, signal is transmitted to computer, computer shows the height H of luminous point；
3) according to optical principle it is found thatWherein, L is the piston rod of plunger case
Displacement；R is the vertical range of piston rod and rotary middle point O；Horizontal distances of the M between concavees lens and rotary middle point O；N
For the horizontal distance between light spot position sensitivity device and concavees lens；F is the focal length of concavees lens；
4) according to the displacement L of H pushing piston-rods, leakage rate V=LS is finally obtained；Wherein S is the sectional area of piston rod.
4. detection method according to claim 3, it is characterised in that：Wherein g is rotation center O and luminous point
Horizontal distance between position sensitive detector.
5. detection method according to claim 4, it is characterised in that：
6. detection method according to claim 5, it is characterised in that：If do not have leakage rate, the height of luminous point is Δ H,
Also according to optical principle,
The displacement of piston rod, final tiny leakage amount are when wherein Δ L is no leakage rate：V=S (L- Δ L) is i.e.：
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810180556.1A CN108374816B (en) | 2018-03-05 | 2018-03-05 | A kind of hydraulic interior leak detection apparatus and the detection method using the device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810180556.1A CN108374816B (en) | 2018-03-05 | 2018-03-05 | A kind of hydraulic interior leak detection apparatus and the detection method using the device |
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| Publication Number | Publication Date |
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| CN108374816A true CN108374816A (en) | 2018-08-07 |
| CN108374816B CN108374816B (en) | 2019-10-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702337A (en) * | 2019-09-20 | 2020-01-17 | 中联重科股份有限公司 | Leak test device and leak test method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19927117A1 (en) * | 1999-06-15 | 2000-12-21 | Sitec Industrietechn Gmbh | Measuring device for detecting leakage from hydraulic components has pressure senor for measuring pressure in piston and displacement sensor for piston rod path |
| CN205956117U (en) * | 2016-01-13 | 2017-02-15 | 中南大学 | Let out leakage quantity measuring device in arbitrary stroke position of pneumatic cylinder is small |
| CN206206322U (en) * | 2016-11-04 | 2017-05-31 | 燕山大学 | A kind of low discharge leakage tester |
-
2018
- 2018-03-05 CN CN201810180556.1A patent/CN108374816B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19927117A1 (en) * | 1999-06-15 | 2000-12-21 | Sitec Industrietechn Gmbh | Measuring device for detecting leakage from hydraulic components has pressure senor for measuring pressure in piston and displacement sensor for piston rod path |
| CN205956117U (en) * | 2016-01-13 | 2017-02-15 | 中南大学 | Let out leakage quantity measuring device in arbitrary stroke position of pneumatic cylinder is small |
| CN206206322U (en) * | 2016-11-04 | 2017-05-31 | 燕山大学 | A kind of low discharge leakage tester |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702337A (en) * | 2019-09-20 | 2020-01-17 | 中联重科股份有限公司 | Leak test device and leak test method |
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| CN108374816B (en) | 2019-10-29 |
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