CN208749690U - A kind of oil cylinder working-pressure compensator buffer loop - Google Patents
A kind of oil cylinder working-pressure compensator buffer loop Download PDFInfo
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- CN208749690U CN208749690U CN201821228096.7U CN201821228096U CN208749690U CN 208749690 U CN208749690 U CN 208749690U CN 201821228096 U CN201821228096 U CN 201821228096U CN 208749690 U CN208749690 U CN 208749690U
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Abstract
The utility model discloses a kind of oil cylinder working-pressure compensator buffer loops, including constant pressure variable displacement pump, accumulator, pressure compensator, proportioning valve, shuttle valve, oil cylinder.The utility model is applied in combination by pressure compensator and shuttle valve, and proportioning valve is enabled to carry out proportionality velocity modulation control to the both direction of oil cylinder, it can be such that the pressure difference before and after proportioning valve keeps constant, and influences the speed of executing agency by load variation.The effect due to flow media in system or executing agency's inertia is avoided, makes to simultaneously form very high surge pressure in system and cause hydraulic shock.Since pressure compensator detection carrys out self-supported pressure, to make the output flow of system that there is stronger anti-loading interference performance, it is suitable for load and changes big, the demanding occasion of Steady speed, the utility model is compact-sized, control precision is high, safe and reliable, improves hydraulic system efficiency.
Description
Technical field
The utility model relates to hydraulic proportional opened loop control field, specifically provides a kind of oil cylinder working-pressure compensator and buffer back
Road.
Background technique
It is known that: it is obtained by valve port of slide valve flow by formula (1):
In formula:
Q-valve port of slide valve output flow；
C-discharge coefficient, it is related with the shape of orifice, oil liquid density, it can be considered constant；
A-valve port of slide valve flow area；
The given electric current of i-electro-hydraulic proportional valve electromagnet；
Δ p-valve port of slide valve front and back pressure difference (p1-p2)；
ρ-fluid density.
It is only directly proportional to the square root of pressure difference before and after valve port by the flow of valve port in the certain situation of valve port opening.
In addition, in opened loop control, when the signal i that PLC gives valve is fixed, the opening (being equivalent to spool displacement amount) of valve
It will fix, pressure differential deltap p will follow the variation of load and change before and after valve at this time.That is proportioning valve real fluid passes through at this time
Amount q is with load variation, when the load is large, actual flow q smaller (executing agency slows)；Conversely, actual flow q
Larger (executing agency's speed becomes faster).
In addition, in other words, the contacting there is no what certainty with input signal of executing agency's movement velocity at this time, and only
When spool displacement (actually passing through flow) relationship proportional to given electric signal i, just it is convenient for the control of PLC.In higher control
The occasion of required precision, the stability of proof load movement velocity, avoids hydraulic shock, just becomes each design of Hydraulic System
The problem of person needs emphasis to consider.
In addition, cause the variation of pressure differential deltap p before and after valve by load variation or charge oil pressure variation, pressure differential deltap p before and after valve
Variation makes the output flow q of electro-hydraulic proportional valve generate variation, and the variation of output flow q will form to electro-hydraulic proportional valve flow control
Interference, and then cause to cause hydraulic system severe impact to the out of control of executing agency's movement velocity.
In addition, the surge pressure of in general hydraulic shock generation, up to the 1~1.5 of normal system pressure times.This
Kind impact force harm is very serious, and hydraulic valve platform can be caused to connect bolt fatigue fracture, the reliability and stability of hydraulic system
Also the influence that will receive impact force, causes hydraulic system to heat up, and generates vibration and noise and connector loosens oil leak, make pressure
The adjustment pressure (setting value) of valve changes.Pipe breakage, Hydraulic Elements and measuring instrumentss damage, pressure is caused to pass when serious
Sensor can issue false command because of hydraulic shock.
Utility model content
In order to solve the above-mentioned technical problem, the utility model provides a kind of oil cylinder working-pressure compensation buffer control circuit, with
The out of control of executing agency's movement velocity in the prior art is solved, hydraulic system severe impact problem is caused.
The utility model is realized in this way a kind of oil cylinder working-pressure compensator buffer loop is provided, including constant pressure variable displacement pump,
Accumulator, pressure compensator, proportioning valve and shuttle valve, two ports and oil inlet pipe and oil outlet pipe of the side of proportioning valve connect
It connects, the another port of the other side and the rod chamber of oil cylinder and rodless cavity piping connection, the oil inlet pipe between proportioning valve and fuel tank
On the road, since fuel tank side, it is successively arranged constant pressure variable displacement pump, accumulator and pressure compensator, shuttle valve is connected to parallel way
Between the rodless cavity and rod chamber of oil cylinder, and shuttle valve also passes through control oil circuit and connect with the pressure compensator.
Further, the pressure compensator is uniform-pressure-drop valve.
Compared with the prior art, the advantages of the utility model are:
1, pressure compensator achievees the purpose that steady load flow by the pressure difference before and after stablizing slide valve.
2, since pressure compensator detection carrys out self-supported pressure, so that it is preferable anti-negative to have the output flow of system
Carry changing capability.
3, the combination of pressure compensator and throttle valve, may make up the speed governing valve of degree of precision, and the knot with proportional direction valve
It closes, then may make up bidirectional speed governing valve.
4, with a large amount of uses of proportioning valve, pressure compensator is used cooperatively separately as an element with proportioning valve,
The flexibility and range of its application have been expanded significantly.
5, pressure compensator is usually used in big, high suitable for the Steady speed occasion of load variation.
6, the component in element is extracted out and recombinates to form new application with other elements, it can be beneficial to Hydraulic Industry one kind
Inspiration.
7, band pressure compensator control loop is avoided that the out of control of executing agency's movement velocity and causes hydraulic system violent
Impact.
8, horsepower requirements of the designer according to system, response characteristic, application etc. reasonably select pressure compensator control
Circuit is greatly improved hydraulic system efficiency.
Detailed description of the invention
With reference to the accompanying drawing and embodiment is described in further detail the utility model:
Fig. 1 is oil cylinder working-pressure compensator buffer loop structural schematic diagram in the utility model；
Fig. 2 is pressure compensator and its connection relationship structural schematic diagram.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, with reference to the accompanying drawing and implement
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is used only for explaining
The utility model is not used to limit the utility model.
Referring to Fig. 1, the utility model provides a kind of oil cylinder working-pressure compensator buffer loop, including constant pressure variable displacement pump 1, storage
Energy device 2, pressure compensator 3 (uniform-pressure-drop valve), proportioning valve 4 and shuttle valve 5, two ports and oil inlet pipe of the side of proportioning valve 4
Road is connected with oil outlet pipe, the another port of the other side and the rod chamber of oil cylinder 6 and rodless cavity piping connection, proportioning valve 4 with
On oil inlet pipe between fuel tank, since fuel tank side, constant pressure variable displacement pump 1, accumulator 2 and pressure compensator 3, shuttle are set gradually
Valve 5 is connected between the rodless cavity and rod chamber of oil cylinder 6 with parallel way, and shuttle valve 5 also passes through control oil circuit and the pressure
Compensator 3 connects.
The utility model is applied in combination by pressure compensator 3 and shuttle valve 5, enables proportioning valve 4 to two of oil cylinder 6
Direction carries out proportionality velocity modulation control, it can be such that the pressure difference of 4 front and back of proportioning valve keeps constant, and loads the speed of oil cylinder 6 not
The influence of variation.The effect due to flow media in system or executing agency's inertia is avoided, makes to simultaneously form in system very high
Surge pressure and cause hydraulic shock.
As shown in Fig. 2, from pressure compensator (uniform-pressure-drop valve) working principle diagram:
p1Ac+Fs=K (xv0+xv)+p2Ac；(uniform-pressure-drop valve spool stress balance equation)
That is:In formula:
Pressure difference before and after Δ p-proportioning valve；
Ac-uniform-pressure-drop valve spool end area, herein spool both ends area equation；
K-determines 8 rigidity of pressure spring, can be considered constant；
xv0- determine pressure spring 8 assemble when pre compressed magnitude；
Xv-determines displacement when pressure spring 8 plays depressurization；
Steady-state fluid force on Fs-uniform-pressure-drop valve valve port 7；
Ignore steady-state fluid force Fs, when spring is very soft, again very in short-term, spring force changes with regard to very little, thus Δ p for adjusting displacement
It is approximately constant.When the outer load of oil cylinder 6 variation, due to the feedback effect of shuttle valve, the spool of pressure compensator will be built again
Equilbrium position is stood, the pressure differential deltap p before and after proportioning valve is still constant, i.e., the pressure differential deltap p before and after electro-hydraulic proportional valve remains constant,
6 total travel stable action of oil cylinder, hydraulic control circuit is without impact.
Application mode of the pressure compensation principle in hydraulic system be it is various, when in use, it is necessary to according to specific reality
Situation reasonably selects, proper use of.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (2)
1. a kind of oil cylinder working-pressure compensator buffer loop, which is characterized in that including constant pressure variable displacement pump, accumulator, pressure compensator,
Two ports of proportioning valve and shuttle valve, the side of proportioning valve are connect with oil inlet pipe and oil outlet pipe, the another port of the other side
With the rod chamber and rodless cavity piping connection of oil cylinder, on the oil inlet pipe between proportioning valve and fuel tank, since fuel tank side, according to
Secondary to be equipped with constant pressure variable displacement pump, accumulator and pressure compensator, shuttle valve is connected to the rodless cavity and rod chamber of oil cylinder with parallel way
Between, and shuttle valve also passes through control oil circuit and connect with the pressure compensator.
2. oil cylinder working-pressure compensator buffer loop described in accordance with the claim 1, which is characterized in that the pressure compensator is fixed
Difference pressure-reducing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821228096.7U CN208749690U (en) | 2018-08-01 | 2018-08-01 | A kind of oil cylinder working-pressure compensator buffer loop |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821228096.7U CN208749690U (en) | 2018-08-01 | 2018-08-01 | A kind of oil cylinder working-pressure compensator buffer loop |
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| CN208749690U true CN208749690U (en) | 2019-04-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757595A (en) * | 2018-08-01 | 2018-11-06 | 本钢板材股份有限公司 | A kind of oil cylinder working-pressure compensator buffer loop |
| CN111963868A (en) * | 2020-08-27 | 2020-11-20 | 珠海大横琴科技发展有限公司 | Target tracking shooting device |
| CN112922919A (en) * | 2021-01-15 | 2021-06-08 | 苏州仁甬得物联科技有限公司 | Flexible profiling system of bar object |
-
2018
- 2018-08-01 CN CN201821228096.7U patent/CN208749690U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757595A (en) * | 2018-08-01 | 2018-11-06 | 本钢板材股份有限公司 | A kind of oil cylinder working-pressure compensator buffer loop |
| CN111963868A (en) * | 2020-08-27 | 2020-11-20 | 珠海大横琴科技发展有限公司 | Target tracking shooting device |
| CN112922919A (en) * | 2021-01-15 | 2021-06-08 | 苏州仁甬得物联科技有限公司 | Flexible profiling system of bar object |
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