CN108561362A - Balanced valve and hydraulic lifting system and Work machine - Google Patents
Balanced valve and hydraulic lifting system and Work machine Download PDFInfo
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- CN108561362A CN108561362A CN201810705466.XA CN201810705466A CN108561362A CN 108561362 A CN108561362 A CN 108561362A CN 201810705466 A CN201810705466 A CN 201810705466A CN 108561362 A CN108561362 A CN 108561362A
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- valve
- oil
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- lifting
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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
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
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- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to balanced valves, and Impact in Hydraulic System is shaken when to solve to fall after rise in existing lifting hydraulic system；There is provided a kind of balanced valve, it is characterised in that there is positive oil inlet, positive oil outlet, oil return opening and include pilot operated valve device, pressure difference control oil circuit, pilot operated valve device reverse-conducting control oil circuit；Pressure difference control oil circuit includes the first electromagnetic switch valve, the second throttle that certainly positive oil outlet to positive oil inlet is sequentially connected in series；Pilot operated valve device reverse-conducting control oil circuit includes the third throttle valve that oil inlet end is connect with from positive oil outlet, and concatenated second electromagnetic switch valve and differential pressure control switch valve are provided on the oil circuit between third throttle valve oil outlet end and oil return opening；The hydraulic control end of pilot operated valve device is connect with the oil outlet end of third throttle valve, and the hydraulic control end at differential pressure control switch valve both ends is connect with the oil inlet end of second throttle and oil outlet end respectively；In the present invention, without impact when pilot operated valve device is reversely opened, stationarity when reverse-conducting is improved.
Description
Technical field
The present invention relates to a kind of hydraulic units, more specifically to a kind of balanced valve and hydraulic lifting system and operation
Machinery.
Background technology
Balanced valve is applied in various engineering machinery, and the application especially in the mechanical equipment with lifting function is the most
Extensively.The effect of balanced valve is that workpiece is exceeded the speed limit decline due to dead weight in order to prevent, or prevent in descending motion by
Lead to the generation of the unsteady motion of speed runaway in dead weight, avoids the generation of unexpected danger.
Existing balanced valve has positive oil inlet, positive oil outlet, hydraulic control hydraulic fluid port；It is fuel-displaced in positive oil inlet and forward direction
Mouthful between be parallel with check valve and switch valve, the hydraulic control end of switch valve is connect with hydraulic control hydraulic fluid port, check valve from positive oil inlet to
Positive oil outlet one-way conduction.Balanced valve is in application as shown in Figure 1, being connected on the rodless cavity oil circuit of hydraulic cylinder, hydraulic control end
It is connected on the rod chamber oil circuit of hydraulic cylinder.When lifting, positive oil inlet of the hydraulic oil through balanced valve, check valve, forward direction
Oil outlet enters the rodless cavity of hydraulic cylinder, and piston rod is released, and realizes lifting action；When carrying out falling action, when being lifted
The object risen is with normal speed when being fallen, and the piston rod of hydraulic cylinder is also with normal speed retraction, hydraulic cylinder at this time
There is certain pressure, which acts on the hydraulic control end of switch valve, switch valve is made to be connected, so that balanced valve in rod chamber
Rodless cavity through hydraulic cylinder of reverse-conducting, i.e. hydraulic oil, the positive oil outlet of balanced valve, switch valve, positive oil inlet outflow,
Realize the retraction of hydraulic cylinder piston rod.When lifted object is declined with too fast speed under the action of self-weight, hydraulic pressure
The rod chamber hypotony (hydraulic cylinder piston retraction is too fast, and it is in negative pressure state that may cause rod chamber suction) of oil cylinder, pressure
Power is insufficient to allow switch valve to be connected, so that balanced valve is in cut-off state, the hydraulic oil of the rodless cavity of hydraulic cylinder can not
It is flowed back by balanced valve, to limit the speed of hydraulic cylinder piston rod retraction.
In above-mentioned balanced valve application, when being fallen after rise by lifting object, positive oil outlet has certain pressure, acts on
The valve port of switch valve, when reverse-conducting, the unlatching startup time of switch valve is very short and startup speed is fast, is easy to cause decline and opens
Impact and jitter phenomenon occur when opening.
Invention content
Impact in Hydraulic System is shaken when being fallen after rise in existing lifting hydraulic system the technical problem to be solved by the present invention is to be directed to
The problem of, and a kind of balanced valve and hydraulic lifting system and Work machine are provided, system is rushed when lifting weight being avoided to fall after rise
The problem of hitting shake.
The present invention is to realize that the technical solution of its purpose is such：There is provided a kind of balanced valve, it is characterised in that have just
To oil inlet, positive oil outlet, oil return opening and include pilot operated valve device, is provided between positive oil inlet and positive oil outlet and institute
The pressure difference control oil circuit for stating pilot operated valve device parallel connection, is provided with pilot operated valve device reverse-conducting control oil between positive oil inlet and oil return opening
Road；
The pilot operated valve device is connected between positive oil inlet and positive oil outlet, positive oil inlet pilot operated valve device when oil-filled
Forward conduction, the hydraulic oil in oil pocket that the reversed oil-filled and described pilot operated valve device of positive oil outlet is connect with positive oil outlet act on
Active force on hydraulic control valve core is more than the spring at the hydraulic control end of pilot operated valve device and hydraulic oil acts on the active force when institute on spool
State pilot operated valve device reverse-conducting；
Pressure difference control oil circuit include the first electromagnetic switch valve being sequentially connected in series from positive oil outlet to positive oil inlet,
Second throttle；
The pilot operated valve device reverse-conducting control oil circuit includes the third throttle valve that oil inlet end is connect with from positive oil outlet,
Concatenated second electromagnetic switch valve and differential pressure control switch are provided on oil circuit between third throttle valve oil outlet end and oil return opening
Valve；
The hydraulic control end of the pilot operated valve device is connect with the oil outlet end of third throttle valve, the liquid at differential pressure control switch valve both ends
Control end is connect with the oil inlet end of the second throttle and oil outlet end respectively；
First electromagnetic switch valve and the second electromagnetic switch valve normality are cut-off state；The differential pressure control switch valve
Normality is conducting state, when the active force that the pressure difference at second throttle both ends generates at differential pressure control switch valve core both ends is more than
The differential pressure control switch valve is in cut-off state when spring force of the effect on differential pressure control switch valve core.
In the present invention, the reverse-conducting of pilot operated valve device is controlled not against external pressure signal, but when according to reverse-conducting
Pressure difference controls the pressure difference that second throttle both ends generate in oil circuit to control, when the excessive (object lifted of the flow of reverse-conducting
Body fall velocity is too fast), pressure difference controls the pressure difference that second throttle both ends generate in oil circuit and differential pressure control switch valve is closed,
Cause the hydraulic control end pressure of pilot operated valve device to be equal to the pressure that positive oil outlet goes out, is closed so as to cause pilot operated valve device, avoid being lifted object
Body fall velocity exceeds design value.When reverse-conducting, positive oil outlet has certain pressure, but in pilot operated valve device reverse-conducting
Before, the hydraulic oil of positive oil outlet passes through third throttle valve, the second electromagnetic switch valve, differential pressure control switch valve, the 4th throttling
Valve flows into fuel tank circuit so that without impact when pilot operated valve device is opened, improves stationarity when reverse-conducting.
In above-mentioned balanced valve, pressure difference control oil circuit further include be arranged between positive oil outlet and second throttle and
With the concatenated first throttle valve of the first electromagnetic switch valve, second throttle can be connected to the oil inlet of the first electromagnetic switch valve
Side is held, can also be arranged in the oil outlet end side of the first electromagnetic switch valve.
In above-mentioned balanced valve, on pilot operated valve device reverse-conducting control oil circuit between third throttle valve and oil return opening also
It has been arranged in series the 4th throttle valve.4th throttle valve can be arranged in any one position of third throttle valve oil outlet end, namely
Three 4th throttle valve, the second electromagnetic switch valve, differential pressure control switch valve valves arrange connect in any order.
In above-mentioned balanced valve, it is characterised in that when first electromagnetic switch valve is in cut-off state its oil inlet end with it is fuel-displaced
Two-way shut-off valve is equipped between end.It is equipped between its oil inlet end and oil outlet end when second electromagnetic switch valve is in cut-off state
Check valve.The cut-off position of setting two-way shut-off valve and the second electromagnetic switch valve is arranged single in the cut-off position of the first electromagnetic switch valve
To valve, it is intended that reduce electromagnetic switch valve in the leakage rate for ending position.
The present invention is to realize that the technical solution of its purpose is such：A kind of lifting hydraulic system, including lifting oil are provided
Cylinder, elevating ram control valve, the apparatus for controlling of lifting for controlling elevating ram control valve, for detecting apparatus for controlling of lifting liter
The descending operation detection device of operation drops, it is characterised in that further includes controller, is connect with controller and is used to detect lifting control
The descending operation detection device of device descending operation processed, balanced valve above-mentioned, the positive oil inlet and forward direction of the balanced valve go out
Hydraulic fluid port is serially connected on the oil circuit between elevating ram control valve and elevating ram lifting chamber, the oil return opening and fuel tank of the balanced valve
Circuit connects, and the first electromagnetic switch valve of the balanced valve and the electromagnetism end of the second electromagnetic switch valve are connect with the controller,
When descending operation detection device detects that apparatus for controlling of lifting carries out falling operation after rise, the controller o controller signal is first
Keep the second electromagnetic switch valve in the conduction state and then makes the first electromagnetic switch in the conduction state.In the present invention, into
When row falls operation after rise by lifting object, controller detects that apparatus for controlling of lifting lifted by descending operation detection device
After rising the operation that object is fallen after rise, controller first exports control signal to the second electromagnetic switch valve so that at the second electromagnetic switch valve
In conducting position, the oil circuit conducting of positive oil outlet to oil return opening, the hydraulic control end of pilot operated valve device is due to the effect of third throttle valve, pressure
Power decline causes pilot operated valve device to be opened so that balanced valve reverse-conducting (positive oil outlet is connected to positive oil inlet).Then control
Device is on position to the first electromagnetic switch valve.When reverse-conducting, from positive oil outlet to the flow of positive oil inlet from
In (namely by fall velocity of lifting object within the scope of design safety value) within the scope of design value, positive oil outlet to forward direction into
The pressure difference of hydraulic fluid port is smaller, and the pressure difference at second throttle both ends is not enough to that the commutation of differential pressure control switch valve is pushed from conducting position to become
End position, the normal reverse-conducting of balanced valve.When by lifting object fall velocity exceed design value when, positive oil outlet to forward direction into
To increasing, the pressure difference that second throttle both ends generate is enough to push the commutation of differential pressure control switch valve from conducting pressure difference between hydraulic fluid port
Position becomes ending position, and after the cut-off of differential pressure control switch valve, the pressure rising at the hydraulic control end of pilot operated valve device causes pilot operated valve device to close, hydraulic control
Valve reverse-conducting ends, and the hydraulic oil of the positive oil outlet of balanced valve can only control oil circuit again from positive oil inlet stream by pressure difference
Go out.In the present invention, when reverse-conducting, before the unlatching of pilot operated valve device reverse-conducting, the hydraulic oil of positive oil outlet passes through hydraulic control
Valve reverse-conducting controls oil circuit to the pressure release of fuel tank circuit, impact when pilot operated valve device is opened is avoided, in pilot operated valve device by reverse-conducting
To when cut-off, the hydraulic oil of positive oil outlet controls oil circuit to positive oil inlet pressure release by pressure difference, avoids pilot operated valve device by anti-
To impact when being conducted to cut-off.So that entire hydraulic system operates steadily.
In the present invention, when the lifting chamber of hydraulic cylinder refers to that the oil pocket is oil-filled, hydraulic cylinder will be raised by lifting object
Lifting, when being fallen after rise by lifting object, which is discharged fluid therein.Lifting chamber can be the rodless cavity of hydraulic cylinder, such as
The vehicle of the boom cylinder of loading machine, the boom cylinder of excavator, the arm elevating ram of crane or front handling mobile crane, quarry tipper
Struggle against elevating ram；Lifting chamber can also be the rod chamber of hydraulic cylinder, such as the bucket arm cylinder of excavator, when having for bucket arm cylinder
When rod cavity is oil-filled, dipper swings forward promotion, dipper under the effect of gravity backward backswing when, the rod chamber discharge liquor of bucket arm cylinder
Pressure oil.
The present invention is to realize that the technical solution of its purpose is such：A kind of implement is provided, which has
Balanced valve above-mentioned has lifting hydraulic system above-mentioned.Such as the implement can be quarry tipper, lift liquid
Pressure system is tumbled the wagon box hydraulic system for lifting of discharging for lifting wagon box；Or implement is loading machine, lifts hydraulic pressure
System is moved arm lifting hydraulic system；Or the implement is excavator, the lifting hydraulic system is that swing arm lifts liquid
Pressure system；Or the implement is fork truck, the lifting hydraulic system is pallet fork hydraulic system for lifting；Or the operation
Equipment is crane or front handling mobile crane, and the lifting hydraulic system is boom luff hydraulic system.
Compared with prior art, the present invention in balanced valve of the present invention, when reverse-conducting, the reversed unlatching of pilot operated valve device is not necessarily to
Pressure signal control outside reference, but controlled according to the pressure difference generated when flowing through pilot operated valve device, and pilot operated valve device is reversed
In the change procedure of unlatching and cut-off, hydraulic shock is small, and system is steady.
Description of the drawings
Fig. 1 is the schematic diagram of lifting hydraulic system of the present invention.
Parts title and serial number in figure：
Hydraulic oil container 1, oil pump 2, pressure sensor 3, elevating ram control valve 4, pilot valve 5, balanced valve 6, pilot operated valve device 61,
First electromagnetic switch valve 62, the second electromagnetic switch valve 63, differential pressure control switch valve 64, first throttle valve 65, second throttle 66,
Third throttle valve 67, the 4th throttle valve 68, elevating ram 7, controller 8.
Specific implementation mode
Illustrate specific embodiment below in conjunction with the accompanying drawings.
Lifting hydraulic system in the present embodiment can be loading arm lifting hydraulic system, excavator swing arm hydraulic pressure system
The pallet fork of system, the automobile-bucket lifting hydraulic system of quarry tipper, the arm lifting hydraulic system of crane or fork truck lifts liquid
Pressure system, if the connection oil circuit of the rod chamber of hydraulic cylinder and rodless cavity to be exchanged to the dipper swing that can also be excavator
Hydraulic system etc..The lifting hydraulic system can be used for the flexible hydraulic system for lifting weight G of hydraulic cylinder.
As shown in Figure 1, the lifting hydraulic system in the present embodiment includes elevating ram 7, elevating ram control valve 4, is used for
The apparatus for controlling of lifting for controlling elevating ram control valve, the descending operation for detecting apparatus for controlling of lifting descending operation detect dress
It sets, controller 8, the descending operation detection device for being connect with controller and being used to detect apparatus for controlling of lifting descending operation, balance
Valve 6.
As shown in Figure 1, balanced valve 6 has positive oil inlet P, positive oil outlet A, oil return inlet T and includes pilot operated valve device 61,
The pressure difference control oil circuit in parallel with pilot operated valve device 61 is provided between positive oil inlet P and positive oil outlet A, in positive oil inlet and
Pilot operated valve device reverse-conducting control oil circuit is provided between oil return opening.
Pilot operated valve device 61 is connected between positive oil inlet P and positive oil outlet A, pilot operated valve device 61 when positive oil inlet P is oil-filled
Forward conduction, hydraulic oil is flowed into from positive oil inlet P to flow out through pilot operated valve device from positive oil outlet A.Positive oil outlet is reversely oil-filled
And the active force that the hydraulic fluid pressure in the oil pocket that is connect with positive oil outlet of pilot operated valve device 61 acts on hydraulic control valve core is more than
Pilot operated valve device reverse-conducting namely hydraulic oil are from just when the hydraulic control end spring and hydraulic oil of pilot operated valve device act on the active force on spool
It flows into oil outlet A, is flowed out from positive oil outlet through pilot operated valve device.
In the present embodiment, pressure difference control oil circuit includes the first electricity being sequentially connected in series from forward direction oil outlet A to positive oil inlet P
Magnetic switch valve 62, second throttle 66.It can also increase between the first electromagnetic switch valve 62 and positive oil outlet A and the first electricity
62 concatenated first throttle valve 65 of magnetic switch valve.
In the present embodiment, pilot operated valve device reverse-conducting control oil circuit includes the third that oil inlet end is connect with from forward direction oil outlet A
Throttle valve 67 is provided with concatenated second electromagnetic switch valve on the oil circuit between 67 oil outlet end of third throttle valve and oil return inlet T
63 and differential pressure control switch valve 64.It can also pass through the 4th after the second electromagnetic switch valve 63 and differential pressure control switch valve 64 are connected
68 oil return inlet T of throttle valve connects.
The hydraulic control end of pilot operated valve device 61 is connect with the oil outlet end of third throttle valve 67, the hydraulic control at 64 both ends of differential pressure control switch valve
End is connect with the oil inlet end g of second throttle 66 and oil outlet end d respectively.
The normality of first electromagnetic switch valve 62 and the second electromagnetic switch valve 63 is cut-off state；Differential pressure control switch valve 64
Normality be conducting state, when 66 both ends of second throttle pressure difference differential pressure control switch valve 64 spool both ends generate work
Differential pressure control switch valve 64 is in cut-off state when being firmly more than the spring force on the spool for acting on differential pressure control switch valve 64.
The Electromagnetic Control end of first electromagnetic switch valve 62 and the second electromagnetic switch valve 63 is connect with controller 8, by controller 8
Output control signal changes its working condition.
In the present embodiment, the pilot valve 5 that apparatus for controlling of lifting links by operation handle and therewith, the two-way of pilot valve 5
Guide's output end is connect with the hydraulic control end of elevating ram control valve, and when operation handle makees lift operation, the lifting of pilot valve is first
It leads pressure output end output pilot pressure signal and acts on the lifting pilot control end of elevating ram control valve 4, oil pump 2 is from hydraulic pressure
Draw oil in fuel tank 1 pumps out from pumping hole and is flowed into through elevating ram control valve 4 the positive oil inlet of balanced valve, works as operation
When handle is made to fall operation after rise, the falling pilot pressure output end output pilot pressure signal of pilot valve acts on elevating ram control
The falling pilot control end of valve 4, elevating ram control valve 4 commutate, and the hydraulic oil of the lifting chamber of elevating ram is through balanced valve, lifting
Hydraulic oil container 1 is flowed back in ram control valve 4, fuel tank circuit.
In the present embodiment, descending operation detection device is the pressure sensor 3 being connect with controller, the pressure sensor
3 are arranged the oil circuit fallen after rise between falling pilot control end of the pilot pressure output end to elevating ram control valve 4 in pilot valve 5
On, pilot pressure value is fallen after rise for detecting, if fall pilot pressure value after rise more than preset value, then it is assumed that carried out falling operation after rise.
In other embodiments, descending operation detection device can also be according to the different and different of control system, such as work as operation
When handle is electric control operation handle, when being operated to operation handle, operation handle directly exports corresponding electric signal, rises at this time
Drop operation detection device can be then operation handle itself, and controller obtains the letter for falling signal output end after rise from operation handle
Number, with this to determine whether carrying out falling operation.Descending operation detection device can also be other sensors, for detect into
Row fall after rise operation when apparatus for controlling of lifting or the components such as elevating ram control valve or elevating ram caused by relevant physical quantity,
For judging whether apparatus for controlling of lifting is making descending operation.
In the present embodiment, when carrying out lifting action, since the pressure of the positive oil inlet of balanced valve goes out more than forward direction
The pressure of hydraulic fluid port, pilot operated valve device forward conduction, hydraulic oil liquid pressure oil enter from the positive oil inlet of balanced valve, through pilot operated valve device from forward direction
Oil outlet A exits into the lifting chamber of hydraulic cylinder, pushes piston that weight is made to be lifted.
When controller detects falling operation by descending operation detection device, controller first exports control signal, makes
The conducting of the second electromagnetic switch valve, pilot operated valve device reverse-conducting control oil circuit and are also therefore connected, the pressure at the hydraulic control end of pilot operated valve device because
The effect of third throttle valve and less than the pressure of positive oil outlet.The pressure in oil pocket that pilot operated valve device is connect with positive oil outlet is made
It is more than the elastic force of the liquid controling cavity inner spring of pilot operated valve device with the active force on hydraulic control valve core and hydraulic oil acts on spool
Active force so that pilot operated valve device is connected, balanced valve reverse-conducting, forward direction of the hydraulic oil through balanced valve of the lifting intracavitary of hydraulic cylinder
Oil outlet is flowed out through pilot operated valve device from the positive oil inlet of balanced valve, into elevating ram control valve and eventually enters into fuel tank circuit.
Controller exports electric signal after the conducting of the second electromagnetic switch valve to the first electromagnetic switch valve, and the second electromagnetic switch valve is made to be connected.
After the conducting of second electromagnetic switch valve, positive oil outlet to the pressure difference between positive oil inlet is equal to the pressure difference at first throttle valve both ends
The sum of with the pressure difference at second throttle both ends.By the normal falling of lifting object G, positive oil outlet is between positive oil inlet
Pressure difference is smaller, shares the pressure difference at second throttle both ends and differential pressure control switch valve is insufficient to allow to commutate and end, so hydraulic control
Valve still keeps reversely opening.When this lifting weight G is declined with too fast speed in the presence of its gravity, positive oil outlet is extremely
Pressure difference between positive oil inlet is larger, shares the pressure difference at second throttle both ends and is large enough to that differential pressure control switch valve is made to change
To and end, pilot operated valve device reverse-conducting controls oil circuit cut-off, and the pressure rise at the hydraulic control end of pilot operated valve device is so that pilot operated valve device is cut
Only, since the main oil circuit for flowing through pilot operated valve device ends, the hydraulic fluid flow rate that hydraulic oil is flowed out from the lifting intracavitary of elevating ram subtracts
It is few, it is reduced by the fall velocity of lifting weight G.After pilot operated valve device cut-off, the hydraulic oil of the lifting intracavitary of elevating ram can only pass through
Positive oil outlet A, first throttle valve 65, the first electromagnetic switch valve 62, second throttle 66, positive oil inlet P, elevating ram control
Valve 4 processed returns hydraulic oil container, due to there is a damping action of first throttle valve and second throttle, flow very little, elevating ram
Retraction (or stretching) speed is very low.It normally stretches if operator wants elevating ram, needs first to carry out elevating ram control valve 4
Then the operation of Hui Zhongwei operates act again even if the first electromagnetic switch valve and the second electromagnetic switch valve power off and return to cut-off position
Oil-lifting jar control valve 4 makes it work in falling working position, to make pilot operated valve device work in reverse-conducting position herein.
In the present invention, when reverse-conducting, before the unlatching of pilot operated valve device reverse-conducting, the hydraulic oil of positive oil outlet passes through
Pilot operated valve device reverse-conducting controls oil circuit to the pressure release of fuel tank circuit, avoids impact when pilot operated valve device is opened.In pilot operated valve device by reversed
When being conducted to cut-off, the hydraulic oil of positive oil outlet controls oil circuit to positive oil inlet pressure release by pressure difference, avoids pilot operated valve device
By reverse-conducting to impact when ending.So that entire hydraulic system operates steadily.
Claims (8)
1. a kind of balanced valve, it is characterised in that there is positive oil inlet, positive oil outlet, oil return opening and include pilot operated valve device, just
Oil circuit is controlled to the pressure difference in parallel with the pilot operated valve device is provided between oil inlet and positive oil outlet, in positive oil inlet and is returned
Pilot operated valve device reverse-conducting control oil circuit is provided between hydraulic fluid port；
The pilot operated valve device is connected between positive oil inlet and positive oil outlet, and the pilot operated valve device is positive when positive oil inlet is oil-filled
Conducting, the hydraulic oil in oil pocket that the reversed oil-filled and described pilot operated valve device of positive oil outlet is connect with positive oil outlet act on hydraulic control
Active force on valve core is more than the spring at the hydraulic control end of pilot operated valve device and hydraulic oil acts on the liquid when active force on spool
Control valve reverse-conducting；
The pressure difference control oil circuit includes the first electromagnetic switch valve, second that forward direction oil outlet to positive oil inlet is sequentially connected in series certainly
Throttle valve (66)；
The pilot operated valve device reverse-conducting control oil circuit includes the third throttle valve (67) that oil inlet end is connect with from positive oil outlet,
Concatenated second electromagnetic switch valve (63) and pressure difference control are provided on oil circuit between third throttle valve oil outlet end and oil return opening
Switch valve；
The hydraulic control end of the pilot operated valve device is connect with the oil outlet end of third throttle valve, the hydraulic control end at differential pressure control switch valve both ends
It is connect respectively with the oil inlet end of the second throttle (66) and oil outlet end；
First electromagnetic switch valve and the second electromagnetic switch valve normality are cut-off state；The normality of the differential pressure control switch valve
For conducting state, acted on when the active force that the pressure difference at second throttle both ends generates at differential pressure control switch valve core both ends is more than
The differential pressure control switch valve is in cut-off state when with spring force on differential pressure control switch valve core.
2. balanced valve according to claim 1, it is characterised in that the pressure difference control oil circuit further includes that setting goes out in forward direction
Between hydraulic fluid port and second throttle (66) and with the concatenated first throttle valve of first electromagnetic switch valve (62) (65).
3. balanced valve according to claim 1, it is characterised in that the on pilot operated valve device reverse-conducting control oil circuit
The 4th throttle valve (68) has also been arranged in series between three throttle valves (67) and oil return opening (T).
4. balanced valve according to any one of claim 1 to 3, it is characterised in that first electromagnetic switch valve, which is in, to be cut
Two-way shut-off valve is only equipped with when state between its oil inlet end and oil outlet end.
5. balanced valve according to any one of claim 1 to 3, it is characterised in that second electromagnetic switch valve, which is in, to be cut
Check valve is only equipped with when state between its oil inlet end and oil outlet end.
6. a kind of lifting hydraulic system, including elevating ram, elevating ram control valve, the liter for controlling elevating ram control valve
Control device, the descending operation detection device for detecting apparatus for controlling of lifting descending operation drop, it is characterised in that further include control
Device processed, the descending operation detection device for being connect with controller and being used to detect apparatus for controlling of lifting descending operation, claim 1 to
Balanced valve described in any one of 5, the positive oil inlet of the balanced valve and positive oil outlet are serially connected in elevating ram control valve
It being lifted elevating ram on the oil circuit between chamber, the oil return opening of the balanced valve is connect with fuel tank circuit, and the of the balanced valve
The electromagnetism end of one electromagnetic switch valve and the second electromagnetic switch valve is connect with the controller, when descending operation detection device detects
When apparatus for controlling of lifting carries out falling operation after rise, the controller o controller signal is first on the second electromagnetic switch valve
State simultaneously then makes the first electromagnetic switch in the conduction state.
7. a kind of implement, it is characterised in that distinguish the balanced valve described in any one of claim 1 to 5 or there is right
It is required that the lifting hydraulic system in 6.
8. implement according to claim 7, it is characterised in that the implement is quarry tipper, the lifting liquid
Pressure system is wagon box hydraulic system for lifting；Or the implement is loading machine, the lifting hydraulic system is moved arm lifting
Hydraulic system；Or the implement is excavator, the lifting hydraulic system is swing arm hydraulic system for lifting；Or it is described
Implement is fork truck, and the lifting hydraulic system is pallet fork hydraulic system for lifting；Or the implement is crane, institute
It is boom luff hydraulic system to state lifting hydraulic system；Or the implement is front handling mobile crane, the lifting hydraulic system is
Boom luff hydraulic system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810705466.XA CN108561362B (en) | 2018-07-02 | 2018-07-02 | Balance valve, hydraulic lifting system and operation machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810705466.XA CN108561362B (en) | 2018-07-02 | 2018-07-02 | Balance valve, hydraulic lifting system and operation machine |
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| Publication Number | Publication Date |
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| CN108561362A true CN108561362A (en) | 2018-09-21 |
| CN108561362B CN108561362B (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810705466.XA Active CN108561362B (en) | 2018-07-02 | 2018-07-02 | Balance valve, hydraulic lifting system and operation machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109336006A (en) * | 2018-12-10 | 2019-02-15 | 宁波华液机器制造有限公司 | A kind of electri forklift valve body assembly |
| CN111152838A (en) * | 2018-11-08 | 2020-05-15 | 扬州盛达特种车有限公司 | Hydraulic integrated control device for mine car steering system and box body lifting system |
| CN112065802A (en) * | 2020-09-29 | 2020-12-11 | 浙江海宏液压科技股份有限公司 | Hydraulic lifting system |
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| JP2004036750A (en) * | 2002-07-03 | 2004-02-05 | Aichi Corp | Cylinder operation control device |
| CN203835843U (en) * | 2014-05-09 | 2014-09-17 | 长沙中联消防机械有限公司 | Balance valve group, hydraulic control loop and engineering machinery |
| CN105035979A (en) * | 2015-08-05 | 2015-11-11 | 常德中联重科液压有限公司 | Balance valve group and hydraulic system |
| CN106185633A (en) * | 2016-08-24 | 2016-12-07 | 三汽车起重机械有限公司 | Balancing valve apparatus, crane and elevating mechanism |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111152838A (en) * | 2018-11-08 | 2020-05-15 | 扬州盛达特种车有限公司 | Hydraulic integrated control device for mine car steering system and box body lifting system |
| CN111152838B (en) * | 2018-11-08 | 2023-08-15 | 潍柴(扬州)特种车有限公司 | Hydraulic integrated control device for mine car steering system and box lifting system |
| CN109336006A (en) * | 2018-12-10 | 2019-02-15 | 宁波华液机器制造有限公司 | A kind of electri forklift valve body assembly |
| CN112065802A (en) * | 2020-09-29 | 2020-12-11 | 浙江海宏液压科技股份有限公司 | Hydraulic lifting system |
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| Publication number | Publication date |
|---|---|
| CN108561362B (en) | 2019-12-20 |
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