CN104879334B - Piston elevating mechanism and its hydraulic control device - Google Patents
Piston elevating mechanism and its hydraulic control device Download PDFInfo
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- CN104879334B CN104879334B CN201510196447.5A CN201510196447A CN104879334B CN 104879334 B CN104879334 B CN 104879334B CN 201510196447 A CN201510196447 A CN 201510196447A CN 104879334 B CN104879334 B CN 104879334B
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- oil
- oil circuit
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- hydraulic control
- valve
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Classifications
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
- F15B2211/3053—In combination with a pressure compensating valve
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Types And Forms Of Lifts (AREA)
- Elevator Control (AREA)
Abstract
The present invention provides a kind of piston elevating mechanism and its hydraulic control device, hydraulic control device, including the first oil circuit connected for the rod chamber with the piston cylinder in piston elevating mechanism and the second oil circuit connected for the rodless cavity with the piston cylinder in piston elevating mechanism, second oil circuit is provided with balanced valve, the balanced valve has two working holes being docked and connected with the second oil circuit and the control port by hydraulic control oil circuit and the first oil communication, and the hydraulic control oil circuit has damping hole section.When above-mentioned hydraulic control device is applied on piston elevating mechanism, piston is moved towards rodless cavity direction, i.e. piston is moved down, due to the slow steady unlatching of balanced valve, hydraulic oil in rodless cavity slowly flows out, piston is slowly moved in the presence of the hydraulic oil in load and rod chamber, and lifting stability is preferable.
Description
Technical field
The present invention relates to a kind of piston elevating mechanism and its hydraulic control device.
Background technology
Piston elevating mechanism in engineering machinery and other industrial circles realizes lift by controlling piston reciprocating to lift
The external acting of structure.Being hydraulically operated piston elevating mechanism, as shown in figure 1, the hydraulic control of conventional driving piston lifting more
Device includes having oil inlet P, oil return inlet T and working hole A, working hole B reversal valve 103, and reversal valve 103 is that two four-ways are changed
To valve, the oil inlet of reversal valve 103 is connected with oil pump, and the oil-out T of reversal valve 103 is connected with fuel tank, the work of reversal valve 103
Mouth B is connected by the first oil circuit 107 with the rod chamber of piston cylinder 106, working hole A then passes through the second oil circuit 108 and piston cylinder 106
Rodless cavity connection, and be sequentially arranged hydraulic control one-way valve 104 and one-way throttle valve 105, fluid-control one-way on the second oil circuit 108
The control port of valve 104 is by controlling oil circuit to be connected with the first oil circuit 107, in addition, to ensure safety overflow, in oil pump and commutation
Overflow oil circuit is further connected with oil circuit between valve 103, overflow oil circuit is provided with overflow valve 101.
Hydraulic control device shown in Fig. 1 declines in piston rod in control piston elevating mechanism lifting process, particularly,
Piston towards rodless cavity move when, hydraulic control one-way valve controlled direct takes out, piston load and rod chamber mesohigh oil effect
It is lower not only easily to occur noise rapidly towards rodless cavity movement, be also easy to occur chattering in moving process, decline movement
It is extremely unstable, it is especially apparent during heavier loads, it is impossible to meet and higher place is required to smooth decreasing.
A kind of fire fighting truck supporting leg is disclosed in Authorization Notice No. is CN203847455U Chinese utility model patent to hang down
In the control system of straight oil cylinder, the control system on the working hole and the second oil circuit of the rodless cavity of piston cylinder for connecting reversal valve
Hydraulic control one-way valve is not only provided with, pressure release oil circuit is also connected with, pressure release oil circuit is provided with restricting element and relief valve, in use, working as needs
When withdrawing supporting leg, piston is moved to rodless cavity direction, control relief valve to open first, the pressure oil in rodless cavity is through pressure release
Passage flows to fuel tank, realizes the pre- pressure release of oil cylinder, after pre- pressure release, then switches the working position of reversal valve so that hydraulic control one-way valve
Open, pressure oil flows back to fuel tank through the second oil circuit.But it is stable due to the limited precision of hydraulic control one-way valve in this control system
Property it is poor, and oil pressure after reversal valve handover operation in the first oil circuit can rise rapidly, finally cause hydraulic control one-way valve still
It can be opened rapidly, piston is quickly moved to rodless cavity, and obvious tremble and noise still occurs.
The content of the invention
Piston elevating mechanism hydraulic control device provided by the present invention, to solve piston lift of the prior art
Easily there is the technical problem trembled in the rodless cavity movement to piston cylinder in piston in structure；Meanwhile, the present invention also provides one
Plant the piston elevating mechanism using above-mentioned hydraulic control device.
Piston elevating mechanism provided by the present invention is with the technical scheme of hydraulic control device：A kind of piston elevating mechanism
With hydraulic control device, including the first oil circuit for being connected for the rod chamber with the piston cylinder in piston elevating mechanism and for
Second oil circuit of the rodless cavity connection of the piston cylinder in piston elevating mechanism, the second described oil circuit is provided with balanced valve, and this is put down
Weighing apparatus valve has two working holes being docked and connected with the second oil circuit and the control port by hydraulic control oil circuit and the first oil communication,
The hydraulic control oil circuit has the first damping hole section.
Described hydraulic control device also includes the rodless cavity and fuel tank for being used to connect the piston cylinder in piston elevating mechanism
Pressure release oil circuit, pressure release oil circuit provided with throttling shut-off valve.
The first buffering oil circuit of the first oil circuit and the second oil circuit is communicated between the first described oil circuit and the second oil circuit,
First buffering oil circuit is provided with the first buffer damping hole section.
It is connected with the second buffering oil circuit for connecting fuel tank, the second buffering oil circuit and sets on the first described buffering oil circuit
There is the second buffer damping hole section.
Described hydraulic control device includes correspondence and first oil circuit, the velocity compensation module of the second oil communication,
Velocity compensation module includes pressure compensator, reversal valve and shuttle valve, shuttle valve have an oil-out and respectively with the first oil circuit, the
Two oil inlets of two oil communications, reversal valve has oil inlet, for the oil return opening that is connected with fuel tank and respectively with the first oil
There is road, two working holes of the second oil communication, pressure compensator oil inlet, test oil to be pressed into mouth and oil-out, pressure compensation
The test oil of device is pressed into mouth and connected with the oil-out of shuttle valve, and the oil-out of pressure compensator is connected with the oil inlet of reversal valve.
The test oil that the oil-out of described shuttle valve senses oil circuit and pressure compensator by oil pressure presses inlet communication, described
Oil pressure sensing oil circuit has the second damping hole section.
Described reversal valve is proportional reversing valve.
Described hydraulic control device includes connecting on the oil feeding line for supplying hydraulic oil to velocity compensation module, oil feeding line
Overflow oil circuit is connected with, the overflow oil circuit includes being equipped with least two overflow branch roads that are arranged in parallel, each overflow branch road excessive
Flow only one overflow branch road conducting every time in valve, and all overflow branch roads.
The technical scheme of piston elevating mechanism provided by the present invention using above-mentioned hydraulic control device is：A kind of piston
Be connected with piston rod on elevating mechanism, including piston cylinder, the piston of piston cylinder, the inner chamber of piston cylinder by piston be divided into rod chamber and
Rodless cavity, includes the hydraulic control device of driving piston reciprocating movement, and hydraulic control device includes correspondence and connected with rod chamber
The first oil circuit and the second oil circuit for being connected with the rodless cavity, the second described oil circuit is provided with balanced valve, balanced valve tool
There are two working holes being docked and connected with the second oil circuit and the control port by hydraulic control oil circuit and the first oil communication, the liquid
Oil-control road has damping hole section.
Described hydraulic control device includes correspondence and first oil circuit, the velocity compensation module of the second oil communication,
Velocity compensation module includes pressure compensator, reversal valve and shuttle valve, shuttle valve have an oil-out and respectively with the first oil circuit, the
Two oil inlets of two oil communications, reversal valve has oil inlet, for the oil return opening that is connected with fuel tank and respectively with the first oil
There is road, two working holes of the second oil communication, pressure compensator oil inlet, test oil to be pressed into mouth and oil-out, pressure compensation
The test oil of device is pressed into mouth and connected with the oil-out of shuttle valve, and the oil-out of pressure compensator is connected with the oil inlet of reversal valve.
The beneficial effects of the invention are as follows：Hydraulic control device provided by the present invention when in use, by the first oil circuit and work
The rod chamber connection of plug cylinder, the second oil circuit is connected with the rodless cavity of piston cylinder, when having bar to piston cylinder by the first oil circuit
Chamber input hydraulic oil with force piston to rodless cavity direction move when, the hydraulic oil in the first oil circuit enters balance through hydraulic control oil circuit
In the control port of valve, balanced valve is controlled to be opened, two working holes conducting of balanced valve, and the pressure oil in rodless cavity is through the second oil
Road is discharged, the control due to hydraulic control oil circuit with the slow a small amount of inflow balanced valve of the hydraulic oil in damping hole section, the second oil circuit
In hydraulic fluid port, balanced valve is slowly turned on, and this flow allowed between two working holes of balanced valve gradually increases, and can effectively ensure that
Hydraulic oil in the rodless cavity of piston cylinder slowly and steadily flows away through the second oil circuit, effectively prevent appearance due to hydraulic control one-way valve
Controlled rapid opening and the piston movement that occurs are the problem of tremble.Applied when by above-mentioned hydraulic control device in piston elevating mechanism
When upper, piston is moved towards rodless cavity direction, due to the slow steady unlatching of balanced valve, and the hydraulic oil in rodless cavity slowly flows
Go out, piston is slowly moved in the presence of the hydraulic oil in load and rod chamber, lifting stability is preferable.
Further, pressure release oil circuit is set, and throttling shut-off valve is set on pressure release oil circuit, when system breaks down,
Pressure discharge operations can be carried out to rodless cavity by the shut-off valve that throttles, so as to control piston to decline shift position.
Further, it can so be lifted between the first oil circuit and the second oil circuit provided with the first buffering oil circuit in piston
When mechanism starts, allow in two oil circuits there is the pressure oil in the oil circuit of elevated pressures oil to be flowed into through the first buffer damping hole section
In another oil circuit, and then stable throttling can be played a part of, reduction impact improves the stabilization of whole hydraulic control device
Property.
Further, the second buffering oil circuit for connecting fuel tank is additionally provided with the first buffering oil circuit, in the second buffering
Effect of the oil circuit provided with the stable throttling of the second damping buffering hole section air flue, reduction impact improves hydraulic control device stability,
Improve operation comfort.
Further, the pressure compensator in velocity compensation module, velocity compensation module is set according to first detected
Hydraulic oil in fuel injection pressure signal in oil circuit, the second oil circuit, the oil inlet to inputing to reversal valve carries out pressure compensation, improves and lives
Fill in the motion rigidity of piston in elevating mechanism so that piston traveling speed is not influenceed by load change.Also, by balanced valve,
Pressure compensator is used cooperatively with reversal valve, and piston elevating mechanism can be made to realize higher control accuracy and positioning precision.
Further, multiple overflow branch roads are connected on oil feeding line, can be changed according to different loads, made different
Overflow branch road is turned on, and expands pressure regulation spectrum.
Brief description of the drawings
Fig. 1 is the hydraulic schematic diagram of the hydraulic control device of piston elevating mechanism in the prior art；
Fig. 2 is a kind of hydraulic schematic diagram of embodiment of piston elevating mechanism provided by the present invention.
Embodiment
As shown in Fig. 2 the piston elevating mechanism in a kind of embodiment of piston elevating mechanism, the embodiment includes piston cylinder
11, piston rod is connected with the piston of piston cylinder 11, and the inner chamber of piston cylinder 11 is divided into rod chamber and rodless cavity by piston, in addition to
For the hydraulic control device for driving piston reciprocating to move, the hydraulic control device includes correspondence and the rod chamber of piston cylinder 11 connects
The first logical oil circuit 100 and the second oil circuit 200 connected with the rodless cavity of the piston cylinder 11, the first oil circuit and second herein
Oil circuit is connected with velocity compensation module 13, two working holes difference of the proportional reversing valve 7 in velocity compensation module 13 herein
Connected with the first oil circuit 100, the second oil circuit 200, and the oil inlet of proportional reversing valve 7 then passes through pressure compensator 6 and fuel feeding oil
Road is connected, and the oil-out of proportional reversing valve 7 is then connected with fuel tank.
In the present embodiment, balanced valve 9 is provided with the second oil circuit, the balanced valve 9 has to be docked and connected with the second oil circuit 200
Two working holes and the control port that is connected by hydraulic control oil circuit 400 with the first oil circuit 100, the hydraulic control oil circuit 400 has
First damping hole section 12-1.
Also, hydraulic control device also includes the rodless cavity and fuel tank for being used to connect the piston cylinder 11 in piston elevating mechanism
Pressure release oil circuit 300, pressure release oil circuit 300 is provided with throttling shut-off valve 10, and the throttling shut-off valve is the choke valve that controls manually.
Velocity compensation module in the present embodiment includes pressure compensator 6, proportional reversing valve 7 and shuttle valve 8, and shuttle valve 8 has
One oil-out and two oil inlets connected respectively with the first oil circuit 100, the second oil circuit 200, proportional reversing valve 7 have oil-feed
Mouthful, for the oil return opening that is connected with fuel tank and respectively with the first oil circuit, two working holes of the second oil communication, pressure compensator 6
Be pressed into mouth and oil-out with oil inlet, test oil, the test oil of pressure compensator 6 be pressed into mouth by oil pressure sense oil circuit 61 with
The oil-out connection of shuttle valve 8, oil pressure sensing oil circuit has the second damping hole section 12-4, the oil-out and ratio of pressure compensator 6
The oil inlet connection of reversal valve 7.
In addition, being communicated with the first oil circuit 100 and the second oil circuit 200 between the first oil circuit 100 and the second oil circuit 200
First buffering oil circuit 500, the first buffering oil circuit 500 is provided with the first buffer damping hole section 12-2.
Also, the second buffering oil circuit 300 for connecting fuel tank, the second buffering are connected with the first buffering oil circuit 500
Oil circuit 600 is provided with the second buffer damping hole section 12-3.
The first buffer damping hole section and the second buffer damping hole section is set to effectively play the effect of stable throttling herein,
Impact during system acting is reduced, the stability of whole hydraulic control device is improved.
Hydraulic control device includes being communicated with the oil feeding line for supplying hydraulic oil to velocity compensation module 13, oil feeding line
Overflow oil circuit, the overflow oil circuit includes the first overflow branch road 3, the second overflow branch road 4 and the 3rd overflow branch road 5 being arranged in parallel,
Every time only one overflow branch road conducting is equipped with overflow valve, and all overflow branch roads on each overflow branch road.
In the present embodiment, the rod chamber of piston is located above rodless cavity, therefore, when piston is moved to rodless cavity, piston
Decline, piston to rod chamber move when, piston rise.
In use, piston rises：Hydraulic oil through oil feeding line enter pressure compensator 6 in after pressure compensation, into than
In example reversal valve 7, then enter through the one-way valve structures in the second oil circuit 200, balanced valve 9 in the rodless cavity of piston cylinder 11, it is right
Answer, the hydraulic oil in the rod chamber of piston cylinder then flows back to fuel tank through the first oil circuit 100, proportional reversing valve 7, realize that piston is stable
Rise.Due to being provided with pressure compensator, it ensure that the pressure difference of import, the outlet of proportional reversing valve 7 is constant, to cause piston
The rate of climb will not change because of the change of load.
Piston declines：Hydraulic oil enters in pressure compensator 6 after pressure compensation, by proportional reversing valve through oil feeding line
7 enter in the first oil circuit 100, and hydraulic oil is divided into two parts, and most enters in the rod chamber of piston cylinder 11, applies to piston
Downward active force, one, which laughs at part, enters through hydraulic control oil circuit 400 in the control port of balanced valve 9, forces the main valve of balanced valve 9 to be beaten
Open, the second oil circuit two-way admittance, the pressure oil in the rodless cavity of piston cylinder then flows back to oil through the second oil circuit 200, proportional reversing valve 7
Case, because hydraulic control oil circuit 400 has the first damping hole section 12-1, pressure oil makes in the control port for slowly entering balanced valve
Obtain balanced valve steadily to open, it is ensured that piston falls steadily.
In the present embodiment, reversal valve adoption rate reversal valve so by controlling the openings of sizes of proportional reversing valve, and is tied
Startup impact can effectively be reduced by closing the first buffer damping hole section and the second buffer damping hole section, improve the stability of a system.
And in the present embodiment, proportional reversing valve uses Y type hydraulic proportional reversal valves, by the middle position and balance of the reversal valve
When valve is used cooperatively, because rod chamber is connected by the first oil circuit with fuel tank, now, the oil pressure of rod chamber is zero, and due to flat
Weigh the locking effect of valve, the internal oil pressure in rodless cavity keeps constant, now, can effectively by piston locking at an arbitrary position.
Hydraulic control device in the present embodiment includes velocity compensation module, can so improve the speed of hydraulic control device
Rigidity is spent, in other embodiments, can also save velocity compensation module, it is only necessary to which corresponding reversal valve is set.
In the present embodiment, manual throttling shut-off valve is provided with pressure release oil circuit, can so be carried out in the system failure
Manually adjust so that piston can fall.In other embodiments, it would however also be possible to employ restricting element of the prior art and pressure release
Valve.
In the above-described embodiments, the rod chamber in piston cylinder is located above rodless cavity, when the pressure oil discharge in rodless cavity
When, piston falls, such as the piston elevating mechanism in hoisting system.In other embodiments, if rod chamber in piston cylinder
During positioned at the top of rodless cavity, when the pressure oil discharge in rodless cavity, piston rises, for example, extend downwardly from the supporting leg of piston rod
On piston elevating mechanism.
In addition, the present invention is also provided in a kind of embodiment of piston elevating mechanism hydraulic control device, the embodiment
The structure of hydraulic control device is identical with the structure of the hydraulic control device in above-mentioned piston elevating mechanism, is not repeating herein.
Claims (8)
1. a kind of piston elevating mechanism hydraulic control device, including for the rod chamber with the piston cylinder in piston elevating mechanism
First oil circuit of connection and the second oil circuit connected for the rodless cavity with the piston cylinder in piston elevating mechanism, its feature exist
In：The second described oil circuit is provided with balanced valve, and the balanced valve has two working holes being docked and connected with the second oil circuit and led to
The control port of hydraulic control oil circuit and the first oil communication is crossed, the hydraulic control oil circuit has the first damping hole section, described hydraulic pressure control
Device processed includes correspondence and first oil circuit, the velocity compensation module of the second oil communication, and velocity compensation module includes pressure
Compensator, reversal valve and shuttle valve, shuttle valve have an oil-out and two oil-feeds with the first oil circuit, the second oil communication respectively
Mouthful, reversal valve has oil inlet, for the oil return opening that is connected with fuel tank and respectively two works with the first oil circuit, the second oil communication
Make mouth, there is pressure compensator oil inlet, test oil to be pressed into mouth and oil-out, and the test oil of pressure compensator is pressed into mouth and shuttle valve
Oil-out connection, the oil-out of pressure compensator has two, and one of oil-out is connected with the oil inlet of reversal valve, another
Individual oil-out is connected with the oil return opening of reversal valve.
2. piston elevating mechanism hydraulic control device according to claim 1, it is characterised in that：Described hydraulic control
Device also includes setting on the rodless cavity and the pressure release oil circuit of fuel tank for being used to connect the piston cylinder in piston elevating mechanism, pressure release oil circuit
There is throttling shut-off valve.
3. piston elevating mechanism hydraulic control device according to claim 1, it is characterised in that：The first described oil circuit
And second the first buffering oil circuit for being communicated with the first oil circuit and the second oil circuit between oil circuit, the first buffering oil circuit is provided with first
Buffer damping hole section.
4. piston elevating mechanism hydraulic control device according to claim 3, it is characterised in that：The first described buffering
The second buffering oil circuit for connecting fuel tank is connected with oil circuit, the second buffering oil circuit is provided with the second buffer damping hole section.
5. piston elevating mechanism hydraulic control device according to claim 1, it is characterised in that：Described shuttle valve goes out
The test oil that hydraulic fluid port senses oil circuit and pressure compensator by oil pressure presses inlet communication, and the oil pressure sensing oil circuit has the second resistance
Buddhist nun's hole section.
6. piston elevating mechanism hydraulic control device according to claim 1, it is characterised in that：Described reversal valve is
Proportional reversing valve.
7. piston elevating mechanism hydraulic control device according to claim 1, it is characterised in that：Described hydraulic control
Device includes being communicated with overflow oil circuit on the oil feeding line for supplying hydraulic oil to velocity compensation module, oil feeding line, the oil overflow
Road includes being equipped with overflow valve, and all overflow branch roads at least two overflow branch roads being arranged in parallel, each overflow branch road
Only one overflow branch road conducting every time.
8. being connected with piston rod on a kind of piston elevating mechanism, including piston cylinder, the piston of piston cylinder, the inner chamber of piston cylinder is lived
Plug is divided into rod chamber and rodless cavity, includes the hydraulic control device of driving piston reciprocating movement, and hydraulic control device includes pair
The first oil circuit that should be connected with rod chamber and the second oil circuit connected with the rodless cavity, it is characterised in that：The second described oil
Road is provided with balanced valve, and the balanced valve is with two working holes being docked and connected with the second oil circuit and by hydraulic control oil circuit and first
The control port of oil communication, the hydraulic control oil circuit has a damping hole section, described hydraulic control device include correspondence with it is described
The velocity compensation module of first oil circuit, the second oil communication, velocity compensation module includes pressure compensator, reversal valve and shuttle valve,
Shuttle valve have an oil-out and respectively with the first oil circuit, two oil inlets of the second oil communication, reversal valve have oil inlet,
For the oil return opening that is connected with fuel tank and respectively with the first oil circuit, two working holes of the second oil communication, pressure compensator has
Oil inlet, test oil are pressed into mouth and oil-out, and the test oil of pressure compensator is pressed into mouth and connected with the oil-out of shuttle valve, and pressure is mended
Repaying the oil-out of device has two, and one of oil-out is connected with the oil inlet of reversal valve, another oil-out and reversal valve
Oil return opening is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510196447.5A CN104879334B (en) | 2015-04-23 | 2015-04-23 | Piston elevating mechanism and its hydraulic control device |
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| CN201510196447.5A CN104879334B (en) | 2015-04-23 | 2015-04-23 | Piston elevating mechanism and its hydraulic control device |
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| CN104879334B true CN104879334B (en) | 2017-08-04 |
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| CN107575428B (en) * | 2017-09-05 | 2023-08-11 | 宁波铝台精机有限公司 | Impact-free electro-hydraulic control one-way valve |
| CN108999843B (en) * | 2018-09-07 | 2020-09-29 | 三一汽车起重机械有限公司 | Amplitude falling hydraulic system and crane |
| CN114263822B (en) * | 2021-12-23 | 2023-04-25 | 中国电子科技集团公司第三十八研究所 | Unlocking-resistant impact hydraulic system and method of radar lifting mechanism |
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| Publication number | Publication date |
|---|---|
| CN104879334A (en) | 2015-09-02 |
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