CN110285100A - Damping hydraulic system and engineering machinery - Google Patents
Damping hydraulic system and engineering machinery Download PDFInfo
- Publication number
- CN110285100A CN110285100A CN201910575504.9A CN201910575504A CN110285100A CN 110285100 A CN110285100 A CN 110285100A CN 201910575504 A CN201910575504 A CN 201910575504A CN 110285100 A CN110285100 A CN 110285100A
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- 238000013016 damping Methods 0.000 title claims abstract description 60
- 238000004891 communication Methods 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims description 34
- 230000000694 effects Effects 0.000 abstract description 7
- 238000007667 floating Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 3
- 230000003116 impacting effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 7
- 239000000725 suspension Substances 0.000 description 7
- 238000005336 cracking Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002828 fuel tank Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
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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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Damping Devices (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The present invention provides a kind of damping hydraulic system and engineering machinery.Damping hydraulic system includes self-locking valve group and overflow valve.The oil inlet and actuation oil communication of self-locking valve group, oil outlet is connected to the oil pocket of hanging oil cylinder, and when the actuation oil that self-locking valve group is passed through reaches preset value, the oil inlet and outlet of self-locking valve group is connected to.The oil pocket of hanging oil cylinder is connected to by self-locking valve group with overflow valve.Engineering machinery includes damping hydraulic system.Damping hydraulic system can lock hanging oil cylinder position by the way that self-locking valve group and overflow valve is arranged when realizing not with pressure, guarantee host applied by damping hydraulic system, as there is engineering machinery stable operation to hang, promote the accuracy and safety of operation, while unlocking the floating action of hanging oil cylinder when with pressure, impacting with high pressure suffered by hanging oil cylinder can be filtered out again, there is good damping effect, and there is excellent comfort.
Description
Technical field
The present invention relates to damping control technology field more particularly to a kind of damping hydraulic systems and engineering machinery.
Background technique
The walking comfort of road vehicle is particularly important, and the superiority and inferiority of damping performance is the important consideration mark of walking comfort
It is quasi-.Wheel excavator is a kind of special engineering machinery that can carry out road driving, the walking comfort of wheel excavator and
Safety is to consider one of the important indicator of wheel excavator performance, and wheel excavator relies primarily on hanging oil cylinder control valve control
Hanging oil cylinder work processed, therefore the working performance of hanging oil cylinder control valve is particularly important.
Hanging oil cylinder control valve is used to realize the floating movement of hanging oil cylinder, usually combines structure by check valve and sequence valve
At hanging oil cylinder control valve is commonly used in front of the oil cylinder port of varying load mechanism.Comprehensively consider present hanging oil cylinder control
Valve form and working method all have the defects that various kinds, and some hanging oil cylinder control valve designs are complex, but do not generate
Good counterbalance effect may cause failure rate rising on the contrary.And the hanging oil cylinder control valve mostly used greatly does not consider to jolt
Operation comfort under road conditions, cannot play good damping effect.
Summary of the invention
Aiming at the shortcomings in the prior art, the purpose of the present invention is to provide a kind of damping hydraulic system and engineering machinery,
Under the premise of guaranteeing that hydraulic system is simple as far as possible, damping effect of the engineering machinery under road conditions of jolting is promoted, walking is increased
Comfort.
For this purpose, the purpose of the present invention is realized by following technical solution:
Damping hydraulic system, comprising:
Self-locking valve group, oil inlet and actuation oil communication, oil outlet are connected to the oil pocket of hanging oil cylinder, the latching valve
When the actuation oil that group is passed through reaches preset value, the oil inlet and outlet of the self-locking valve group is connected to；
The oil pocket of overflow valve, the hanging oil cylinder is connected to by the self-locking valve group with the overflow valve.
As the further alternative scheme of the damping hydraulic system, the self-locking valve group include hydraulic control one-way valve and
Throttle valve, the oil outlet of the hydraulic control one-way valve are connected to the oil pocket of the hanging oil cylinder, the guide oil of the hydraulic control one-way valve
Road and actuation oil communication, the oil inlet of the hydraulic control one-way valve pass through the throttle valve and the actuation oil communication.
As the further alternative scheme of the damping hydraulic system, the self-locking valve group includes multiple parallel with one another
Hydraulic control one-way valve, and hanging oil cylinder is connected to correspondingly with the hydraulic control one-way valve.
As the further alternative scheme of the damping hydraulic system, the throttle valve is pressure reducing valve.
As the further alternative scheme of the damping hydraulic system, the overflow valve is set to the throttle valve and institute
It states between hydraulic control one-way valve.
As the further alternative scheme of the damping hydraulic system, throttle orifice is formed on the overflow valve.
As the further alternative scheme of the damping hydraulic system, the overflow valve from oil inlet to spool two
The first feedback oil circuit and the second feedback oil circuit are drawn in end, and the spring of the overflow valve is set to locating for the second feedback oil circuit
Endface；
The throttle orifice is set to the oil overflow road between the first feedback oil circuit and the second feedback oil circuit, described
The pressure of first feedback oil circuit is greater than the pressure of the second feedback oil circuit.
As the further alternative scheme of the damping hydraulic system, the overflow valve is outer controlled overflow valve.
As the further alternative scheme of the damping hydraulic system, the damping hydraulic system further includes pile-up valve
Block, the self-locking valve group and the overflow valve are inserted on the integrated valve block；
Be formed on the integrated valve block actuation hydraulic fluid port, low pressure hydraulic fluid port and execute hydraulic fluid port, the actuation hydraulic fluid port and it is described from
The oil inlet of locking-valve group is connected to, and the oil return opening of the oil return opening and the overflow valve of the low pressure hydraulic fluid port and the self-locking valve group connects
Logical, the execution hydraulic fluid port is connected to the oil outlet of the self-locking valve group.
As the further extension to above-mentioned technical proposal, the present invention also provides a kind of engineering machinery comprising chassis hangs
Hang oil cylinder and above-mentioned damping hydraulic system.
Compared with prior art, this damping hydraulic system and engineering machinery at least have the following beneficial effects:
Damping hydraulic system can lock hanging oil cylinder position by the way that self-locking valve group and overflow valve is arranged when realizing not with pressure
It sets, guarantees host applied by damping hydraulic system, if there is engineering machinery stable operation to hang, promote the accuracy of operation
With safety, while the floating action of hanging oil cylinder is unlocked when with pressure, and height suffered by hanging oil cylinder can be filtered out
Pressure impact, has good damping effect, has excellent comfort.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 shows the schematic diagram of the damping hydraulic system of the offer of the embodiment of the present invention 1；
Fig. 2 shows the schematic diagrams for the damping hydraulic system that the embodiment of the present invention 2 provides；
Fig. 3 shows working effect schematic diagram of the engineering machinery of the offer of the embodiment of the present invention 3 when jolting.
Main element symbol description:
100- damping hydraulic system；The self-locking valve group of 110-；111- hydraulic control one-way valve；111a- guide's oil circuit；112- throttling
Valve；120- overflow valve；121- first feeds back oil circuit；122- second feeds back oil circuit；123- throttle orifice；130- check valve；140- collection
At valve block；141- actuation hydraulic fluid port；142- low pressure hydraulic fluid port；143- executes hydraulic fluid port；200- hanging oil cylinder.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of damping hydraulic system 100, for being connected in hanging oil cylinder 200.It is outstanding
Oil cylinder 200 is hung as the suspension pressure on host applied by damping hydraulic system 100, component is provided, by controlling hanging oil cylinder
200 pressure promotes the comfort level driven to adjust suspension stiffness/hardness of host.
Damping hydraulic system 100 includes self-locking valve group 110 and overflow valve 120.The oil inlet of self-locking valve group 110 and actuation oil
Road connection, oil outlet is connected to the oil pocket of hanging oil cylinder 200, self-locking when the actuation oil that self-locking valve group 110 is passed through reaches preset value
The oil inlet and outlet of valve group 110 is connected to.The oil pocket of hanging oil cylinder 200 is connected to by self-locking valve group 110 with overflow valve 120.
It is self-locking as a result, when actuation oil circuit is not passed through actuation oil or the actuation oil pressure deficiency being passed through to self-locking valve group 110
Valve group 110 remains turned-off, hanging oil cylinder 200 realize it is self-locking so that hanging oil cylinder 200 have biggish rigidity；When actuation oil circuit
When being passed through the actuation oil for meeting the self-locking unlatching of valve group 110 oil pressure to self-locking valve group 110, self-locking 110 unlatchings of valve group/unlock, so that
Hanging oil cylinder 200 can float.High pressure kicks when hanging oil cylinder 200 can be worked by the setting of overflow valve 120 simultaneously,
Filtering is realized to the high pressure of hanging oil cylinder 200, bumpy road can be effectively buffered to the compression shock of hanging oil cylinder 200, mention
Rise the comfort driven.
In the present embodiment, self-locking valve group 110 includes hydraulic control one-way valve 111 and throttle valve 112, and hydraulic control one-way valve 111 goes out
Hydraulic fluid port is connected to the oil pocket of hanging oil cylinder 200, the guide's oil circuit 111a and actuation oil communication of hydraulic control one-way valve 111, hydraulic control list
Pass through throttle valve 112 and actuation oil communication to the oil inlet of valve 111.
Throttle valve 112 is to be saved by changing throttling section or chock length to control the valve of fluid flow by reducing
Flow area increases chock length to increase the pressure loss of throttle valve 112, so that upstream pressure is greater than downstream pressure.It will
The guide's oil circuit 111a and oil inlet of hydraulic control one-way valve 111 be respectively communicated with before the valve of throttle valve 112 and valve after so that hydraulic control list
To reversed cracking pressure be consistently greater than circulating pressure so that can be double between the oil inlet and oil outlet of hydraulic control one-way valve 111
To circulation.
The formed pressure loss of throttle valve 112 to its throttle section and chock length it is related, the Restriction Parameters of throttle valve 112
Centainly, if the oil pressure for the actuation oil that throttle valve 112 is passed through is certain, the downstream pressure of throttle valve 112 is certain.Therefore self-locking
When valve group 110 unlocks, this damping hydraulic system 100 can provide stable pressure for hanging oil cylinder 200, so that hanging oil cylinder
200 can float under metastable pressure.
Hydraulic control one-way valve 111 has preferable response speed/opening speed, when the pressure on its guide's oil circuit 111a meets
It can be opened rapidly when its cracking pressure, throttle valve 112 and hanging oil cylinder 200 are subjected to diconnected, throttle valve 112 is suspension
Oil cylinder 200 provides operating pressure.It can be passed through the oil pressure of the actuation oil of throttle valve 112 by adjusting or adjust throttle valve 112
Restriction Parameters, to realize the adjusting to the floating pressure of hanging oil cylinder 200.Throttle valve 112 is by hydraulic control one-way valve 111 and hangs
The rodless cavity connection of oil cylinder 200 is hung, provides pressure for the piston rod of hanging oil cylinder 200, and then provide suspension stiffness.
Self-locking valve group 110 includes multiple hydraulic control one-way valves 111 parallel with one another, and hanging oil cylinder 200 and the hydraulic control list
It is connected to correspondingly to valve 111.After the oil inlet of each hydraulic control one-way valve 111 is connected in parallel on the valve of throttle valve 112, each hydraulic control
Before the guide's oil circuit 111a of check valve 111 is connected in parallel on the valve of throttle valve 112.
In the present embodiment, self-locking valve group 110 includes two hydraulic control one-way valves 111, is communicated on each hydraulic control one-way valve 111
One hanging oil cylinder 200.When being passed through actuation oil on the oil inlet of throttle valve 112, the guide's oil circuit 111a of hydraulic control one-way valve 111 is controlled
Hydraulic control one-way valve 111 processed is opened, and two hanging oil cylinders 200 are interconnected, and the pressure of two hanging oil cylinders 200 is equal and is equal to section
Flow the downstream pressure of valve 112.
It is above-mentioned, it is all to be fallen with throttling action, the valve for being capable of providing the pressure loss, being capable of forming pressure difference after and before the valve
Enter the selection scope of the throttle valve 112 of the present embodiment.
In the present embodiment, throttle valve 112 is to two-way circulate, and check valve 130 is equipped between actuation oil circuit and throttle valve 112,
And the conducting direction of the check valve 130 is to have actuation oil circuit to flow to throttle valve 112.The setting of overflow valve 120 is unidirectional in throttle valve 112
Between valve 130 and hydraulic control one-way valve 111.As a result, when hanging oil cylinder 200, which is under pressure, impacts, overflow valve 120 can will be hung
The impacting with high pressure of oil cylinder 200 filters.
Preferably, overflow valve 120 is arranged between throttle valve 112 and check valve 130, from can carry out in hanging oil cylinder 200
When high pressure kicks, the oil liquid of overflow can pass through the throttling of throttle valve 112, reduce the flow of overflow oil liquid, when eliminating high pressure,
Reduce the outflow of oil liquid in the oil pocket of hanging oil cylinder 200, promotes the stability of strutting system of the piston rod of hanging oil cylinder 200.
Further, switch valve (not shown), switch are equipped between the oil inlet and actuation oil circuit of self-locking valve group 110
Valve is used to control the on-off of self-locking valve group 110 and actuation oil circuit.Switch valve can be manual switch valve, or solenoid valve.
By the on-off of control switch valve, to control the presence or absence of actuation oil input, and then the self-locking valve group 110 of control is self-locking or unlocks.
When switch valve disconnects, when no actuation oil is input to self-locking valve group 110, self-locking valve group 110 locks hanging oil cylinder 200, hangs
Hanging oil cylinder 200 has biggish rigidity.When switch valve is opened, there is actuation oil to be input to self-locking valve group 110, at this time fluid-control one-way
Valve 111 is opened, and throttle valve 112 can be realized pre-pressure adjusting, and overflow valve 120 carries out high-pressure filteration.
It should be noted that above-mentioned actuation oil circuit can be the hydraulic of host applied by this damping hydraulic system 100
The oil circuit picked out in system provides the hydraulic control cracking pressure that pressure is greater than hydraulic control one-way valve 111；Above-mentioned actuation oil circuit is also
It can be the act pressure as provided by oil pump, switch valve can be saved at this time, directly pass through the start and stop realization pair of control oil pump
The unlock and locking of self-locking valve group 110.
Damping hydraulic system 100 can integrate in a valve block, as a kind of plug-in multi-way valve.Damping hydraulic system
100 further include integrated valve block 140, and throttle valve 112, hydraulic control one-way valve 111 and overflow valve 120 are plugged on integrated valve block 140, and
It is formed with actuation hydraulic fluid port 141, low pressure hydraulic fluid port 142 on integrated valve block 140 and executes hydraulic fluid port 143.Actuation hydraulic fluid port 141 and throttle valve
The oil return opening of the guide's oil circuit 111a connection of 112 oil inlet, hydraulic control one-way valve 111, low pressure hydraulic fluid port 142 and overflow valve 120 connects
It is logical, it executes hydraulic fluid port 143 and is connected to the oil outlet of hydraulic control one-way valve 111.
Throttle valve 112, hydraulic control one-way valve 111 and overflow valve 120 can be inserted valve, by the way that spiral shell is directly arranged on valve body
Threaded hole is arranged on integrated valve block 140 in line, to directly be screwed on integrated valve block 140, spiral shell can also be used on end face
Bolt is connected on integrated valve block 140.Actuation hydraulic fluid port 141 and actuation oil communication, thus by actuation oil communication to throttle valve 112
Oil inlet, hydraulic control one-way valve 111 guide's oil circuit 111a on.Low pressure hydraulic fluid port 142 and low pressure oil way, usually fuel tank is connected to,
To which the oil return of overflow valve 120 is connected to fuel tank.It executes hydraulic fluid port 143 to be connected to hanging oil cylinder 200, so that hanging oil cylinder
200 are connected to the oil outlet of hydraulic control one-way valve 111.The quantity for executing hydraulic fluid port 143 can be multiple, the number with hanging oil cylinder 200
It measures corresponding, naturally it is also possible to it is reserved with spare execution hydraulic fluid port 143, for being connected to more hanging oil cylinders 200, or
It is connected to other execution units.
It is above-mentioned, by the way that each valve of damping hydraulic system 100 to be integrated on an integrated valve block 140, can be more convenient
Integrated valve block 140 is directly fixed on host without reequiping to host applied by damping hydraulic system 100 by dismounting,
And actuation oil circuit, fuel tank and hanging oil cylinder 200 are connected on the corresponding hydraulic fluid port of the integrated valve block 140 by oil pipe.
Above-mentioned, overflow valve 120 is outer controlled overflow valve 120, and as the oil pressure relief of overflow valve 120 can be adjusted from outside
Section, so that the HVT high voltage threshold filtered out be adjusted.The pressure of overflow valve 120 can be adjusted from external hand, by manual
Knob adjusts bolt, thus the decrement of adjustment spring, and then the cracking pressure of regulation relief valve 120；The pressure of overflow valve 120
Or motorized adjustment is carried out from outside, overflow valve 120 is a kind of overflow valve 120 that electric-hydraulic proportion is adjusted at this time, passes through tune
The size for saving input current, thus the cracking pressure of regulation relief valve 120.
Embodiment 2
As shown in Fig. 2, damping hydraulic system 100 provided in this embodiment the difference from embodiment 1 is that, the present embodiment
In, throttle valve 112 is pressure reducing valve, and pressure reducing valve has metastable outlet pressure, when hydraulic control one-way valve 111 is opened, energy
Enough so that hanging oil cylinder 200 is floated under the outlet pressure.
Overflow valve 120 is arranged between the oil outlet of pressure reducing valve and the oil inlet of hydraulic control one-way valve 111.Overflow valve 120 is certainly
Oil inlet draws the first feedback oil circuit 121 and the second feedback oil circuit 122 to the both ends of spool, and the spring of overflow valve 120 is set to
The endface of second feedback oil circuit 122, throttle orifice 123 are set to overflowing between the first feedback oil circuit 121 and the second feedback oil circuit 122
It flows on oil circuit, throttle orifice 123 is set to the oil overflow road between the first feedback oil circuit 121 and the second feedback oil circuit 122, and flow direction is overflow
The oil liquid of stream valve 120 firstly flows through the hydraulic fluid port of the first feedback oil circuit 121 and thinks the second feedback oil circuit 122 flowing through throttle orifice 123, rear stream
Hydraulic fluid port.So that the pressure of the first feedback oil circuit 121 is greater than the pressure of the second feedback oil circuit 122, it is 120 spool of overflow valve
Mobile offer pressure difference.
By fluid mechanics principle it is found that the pressure of fluid is bigger, when flowing through throttle orifice 123, generated pressure difference is bigger,
When the pressure for flowing to overflow valve 120 is sufficiently large, pressure difference is formed by the first feedback oil circuit 121 and the second feedback oil circuit 122
It is sufficiently large to that 120 core of overflow valve is pushed to open, so that high pressure oil overflow.
Throttle orifice 123 is arranged on the oil overflow road of overflow valve 120, reduces the flow of overflow oil liquid, when eliminating high pressure,
Reduce the outflow of oil liquid in the oil pocket of hanging oil cylinder 200, promotes the stability of strutting system of the piston rod of hanging oil cylinder 200.
Above-mentioned, the pressure of pressure reducing valve can be adjusted in outside, can be that manual pressure regulating valve is adjusted by manual knob bolt
Reduce the spring force of pressure valve, or electric pressure-regulating valve, by adjusting the current regulation output pressure inputted to it.Overflow
The oil pressure relief of valve 120 is greater than the downstream pressure of pressure reducing valve, that is, is greater than the operating pressure of hanging oil cylinder 200, such as overflow valve
120 oil pressure relief can be set to the 110% of the operating pressure of hanging oil cylinder 200.The present embodiment is, when hanging oil cylinder 200
When the pressure being subject to is greater than the 110% of operating pressure, 120 overflow of overflow valve, since overflow valve 120 is equipped with the first feedback oil circuit
121, the second feedback oil circuit 122 and throttle orifice 123, therefore the pressure of overflow valve 120 should do corresponding conversion, can pass through reality
Test or be calculated the oil pressure relief of the overflow valve 120 with throttle orifice 123 at this pressure.
Illustratively, throttle valve 112 is electro-hydraulic proportional reducing valve, and overflow valve 120 is electricity liquid ratio relief valve 120, the two
The electric current of input has proportionate relationship, so that overflow valve 120 can be greater than operating pressure in the pressure that hanging oil cylinder 200 is subject to
110% when overflow.
Embodiment 3
The present embodiment provides a kind of engineering machinery comprising the damping fluid in chassis, hanging oil cylinder 200 and embodiment 1 or 2
Pressure system 100, damping hydraulic system 100 are connected to hanging oil cylinder 200, and hanging oil cylinder 200 is connected on chassis, hanging oil cylinder
200 as suspension, for adjusting the hardness on chassis.
Engineering machinery is as host applied by damping hydraulic system 100, and it typically is industrial wheeled equipment, such as wheeled diggings
Pick machine, wheel loader, wheel dozer, wheeled transport vehicle etc..
Fig. 3 shows the working effect schematic diagram using the engineering machinery of this damping hydraulic system 100 when jolting.
The damping hydraulic system 100 and engineering machinery of above-described embodiment have the following technical effect that
1. when road conditions of jolting, damping hydraulic system 100 effectively filters out the pressure peak of hanging oil cylinder 200, Neng Gouyou
Effect ground buffering bumpy road promotes driver comfort to the compression shock of hanging oil cylinder 200.
2. when flat road conditions, the overflow valve 120 of damping hydraulic system 100 is closed, and self-locking valve group 110 can be outstanding when working
It hangs oil cylinder 200 and certain suspension pressure is provided.When it is pressure reducing valve that throttle valve 112, which is selected, the suspension pressure adjustable and adjusting
There is preferable stability afterwards.
3. when engineer machinery operation, damping hydraulic system 100 is realized by closing self-locking valve group 110 to hanging oil cylinder 200
Locking, guarantee engineer machinery operation when chassis stability.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. damping hydraulic system characterized by comprising
Self-locking valve group, oil inlet and actuation oil communication, oil outlet are connected to the oil pocket of hanging oil cylinder, and the self-locking valve group is logical
When the actuation oil entered reaches preset value, the oil inlet and outlet of the self-locking valve group is connected to；
The oil pocket of overflow valve, the hanging oil cylinder is connected to by the self-locking valve group with the overflow valve.
2. damping hydraulic system according to claim 1, which is characterized in that the self-locking valve group include hydraulic control one-way valve and
Throttle valve, the oil outlet of the hydraulic control one-way valve are connected to the oil pocket of the hanging oil cylinder, the guide oil of the hydraulic control one-way valve
Road and actuation oil communication, the oil inlet of the hydraulic control one-way valve pass through the throttle valve and the actuation oil communication.
3. damping hydraulic system according to claim 2, which is characterized in that the self-locking valve group includes multiple parallel with one another
Hydraulic control one-way valve, and hanging oil cylinder is connected to correspondingly with the hydraulic control one-way valve.
4. damping hydraulic system according to claim 2, which is characterized in that the throttle valve is pressure reducing valve.
5. damping hydraulic system according to claim 4, which is characterized in that the overflow valve is set to the throttle valve and institute
It states between hydraulic control one-way valve.
6. damping hydraulic system according to claim 1, which is characterized in that be formed with throttle orifice on the overflow valve.
7. damping hydraulic system according to claim 6, which is characterized in that the overflow valve from oil inlet to spool two
The first feedback oil circuit and the second feedback oil circuit are drawn in end, and the spring of the overflow valve is set to locating for the second feedback oil circuit
Endface；
The throttle orifice is set to the oil overflow between the first feedback oil circuit and the second feedback oil circuit on the road, and described first
The pressure for feeding back oil circuit is greater than the pressure of the second feedback oil circuit.
8. damping hydraulic system according to claim 6, which is characterized in that the overflow valve is outer controlled overflow valve.
9. damping hydraulic system according to claim 1, which is characterized in that the damping hydraulic system further includes pile-up valve
Block, the self-locking valve group and the overflow valve are inserted on the integrated valve block；
It is formed with actuation hydraulic fluid port, low pressure hydraulic fluid port on the integrated valve block and executes hydraulic fluid port, the actuation hydraulic fluid port and the latching valve
The oil inlet connection of group, the low pressure hydraulic fluid port are connected to the oil return opening of the overflow valve, the execution hydraulic fluid port and the latching valve
The oil outlet connection of group.
10. engineering machinery, which is characterized in that subtract including chassis, hanging oil cylinder and as according to any one of claims 1 to 9
Shake hydraulic system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910575504.9A CN110285100B (en) | 2019-06-28 | 2019-06-28 | Damping hydraulic system and engineering machinery |
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| CN110966344A (en) * | 2019-12-27 | 2020-04-07 | 博迈科海洋工程股份有限公司 | Self-adjusting hydraulic vibration isolation system between HVAC machines |
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