CN207421033U - A kind of secondary pressure adjusts hydraulic system - Google Patents
A kind of secondary pressure adjusts hydraulic system Download PDFInfo
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- CN207421033U CN207421033U CN201721448773.1U CN201721448773U CN207421033U CN 207421033 U CN207421033 U CN 207421033U CN 201721448773 U CN201721448773 U CN 201721448773U CN 207421033 U CN207421033 U CN 207421033U
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Abstract
The utility model provides a kind of secondary pressure and adjusts hydraulic system, belongs to technical field of hydraulic pressure.It is less efficient that it solves the problems, such as that existing pressure adjusts hydraulic system.This secondary pressure adjusts hydraulic system, including in-line, oil return line, steering oil circuit, execution oil circuit and the oil intake assembly for turning to oil circuit and performing oil circuit discharge pressure oil can be given, it performs and is provided with main overflow valve between oil circuit and oil return line, hydraulic system further includes the branch's oil circuit being interconnected with performing oil circuit, branch's oil circuit couples oil return line by unloading valve, solenoid valve is connected on the control oil circuit of unloading valve, the setting pressure of main overflow valve is more than the setting pressure of unloading valve.This secondary pressure adjusts the secondary pressure working method that hydraulic system sets pressure by being formed according to main relief valve set pressure and pressure-relief valve, in dynamical system idle running, using relatively low operating pressure, the burden to dynamical system is reduced, engine is avoided to build the pressure flame-out.
Description
Technical field
The utility model belongs to technical field of hydraulic pressure, is related to a kind of secondary pressure and adjusts hydraulic system.
Background technology
Existing internal combustion engine fork lift hydraulic system controls the pressure of entire hydraulic system usually using an overflow valve, in height
In the case of pressing idling, due to the underpower that engine provides, cause to be susceptible to the even flame-out situation that builds the pressure.
In order to solve the problem of underpower under high pressure idle conditions, there is company to design and develop a kind of band preferentially and unloaded
The forklift hydraulic system of lotus function, and applied for Chinese patent【Application number 201120042190.5；Authorization Notice No. CN
201962040U】, the band preferentially and unloading function forklift hydraulic system include two oil pumps, multi-way valve, load sensing steering
Device, steering cylinder, lift oil tank, dump ram etc.；Multi-way valve is sheet-type multi-way valve, including pressure-gradient control valve, lifting reversal valve and is inclined
Oblique reversal valve.The pressure oil of first oil pump output, a part are preferentially diverted to by the CF mouths of pressure-gradient control valve built-in in multi-way valve
The steering gear of fork truck controls the steering of car body；Another part collaborates from the EF mouths of pressure-gradient control valve with the pressure oil that the second oil pump exports
By raising reversal valve, the lift oil tank and dump ram of inclined reversing valve to fork truck, the raising of pallet fork to be controlled to decline with before
Hypsokinesis acts.Second oil pump delivery outlet connects the P2 mouths of multi-way valve, and the mouth of multi-way valve is divided into two-way, a-road-through by three-way pipe
Check valve and oil communication are crossed, another way is connected to the entrance of throttle orifice built-in in off-load valve inlet and unloading valve, throttle orifice
Outlet is communicated with the entrance of solenoid valve, and the outlet of unloading valve and solenoid valve is connected with oil return inlet T.
Above-mentioned forklift hydraulic system by set two oil pumps, and in idling work by unloading valve directly to the second oil pump
Off-load is carried out, the first oil pump carry load work is left, engine torque deficiency during idling is avoided to cause to stop working.But the fork truck liquid
Pressure system has problems in that this structure must be provided with two oil pumps, and the hydraulic pressure of the second oil pump in the idling state
All by unloading valve oil return, only the first oil pump continues relatively low to executing agency's fuel feeding work efficiency oil.
The content of the invention
The purpose of this utility model is in view of the above-mentioned problems existing in the prior art, it is proposed that a kind of secondary pressure adjusts liquid
The technical issues of pressure system, the utility model solves, how is realized by the way that two kinds of operating pressures is set to avoid idling flameout
Improve work efficiency simultaneously.
The purpose of this utility model can be realized by following technical proposal：A kind of secondary pressure adjusts hydraulic system, bag
Include in-line, oil return line, turn to oil circuit, perform oil circuit and can to turn to oil circuit and execution oil circuit discharge pressure oil oil inlet group
Part is provided with main overflow valve, which is characterized in that the hydraulic system is further included and performed between the execution oil circuit and oil return line
Branch's oil circuit that oil circuit is interconnected, branch's oil circuit couple oil return line, the control oil circuit of the unloading valve by unloading valve
On be connected with solenoid valve, the setting pressure of the main overflow valve is more than the setting pressure of unloading valve.
This secondary pressure adjust hydraulic system operation principle be：When dynamical system is in idling mode, solenoid valve breaks
Electricity makes unloading valve be in unloading condition, performs oil circuit and branch's oil communication and passes through unloading valve and connects oil return line so that execution
Oil circuit works under the setting pressure of unloading valve, so that executing agency works in a low voltage state, mitigates to dynamical system
Burden, avoids engine misses.
It is that solenoid valves make unloading valve that can not open when dynamical system is under fast state, performs oil circuit and pass through master
Overflow valve connects oil return line so that performs oil circuit and works under the setting pressure of main overflow valve, so that there is bigger in executing agency
Load capacity.
This secondary pressure adjusts hydraulic system by setting the unloading valve of main overflow valve and solenoid valve control so that performs machine
Structure can work under two kinds of operating pressures, realize secondary pressure control.Under dynamical system idling mode, it is avoided that and starts
Machine builds the pressure flame-out；When dynamical system runs at high speed, the performance of executing agency can be preferably played.
In above-mentioned secondary pressure adjusts hydraulic system, the hydraulic system further includes auxiliary in-line, the auxiliary
In-line is connected with branch oil circuit.In-line is aided in by setting so that performs oil circuit and the fluid of in-line is aided in collaborate it
Afterwards again with the setting pressure feed executing agency of main overflow valve or pressure-relief valve.
In above-mentioned secondary pressure adjusts hydraulic system, the in-line and auxiliary in-line are supplied respectively by an oil pump
Oil.By setting two oil pumps, the fuel feeding efficiency of hydraulic oil is improved.
In above-mentioned secondary pressure adjusts hydraulic system, single channel is provided between the auxiliary in-line and branch's oil circuit
Stable shunt valve.By setting Characteristic of Priority Valve can be by the use of other oil pumps as the oil pump of auxiliary feed-oil, the hydraulic pressure of oil pump
Oil enters Characteristic of Priority Valve from auxiliary oil way, other executing agencies are supplied from current stabilization oil circuit all the way after current stabilization, be left into
Enter branch's oil circuit and collaborate with the hydraulic oil performed in oil circuit；By the flow for making full use of other oil pumps extra, performed to improve
The work efficiency of mechanism.
Compared with prior art, it is the advantages of this secondary pressure adjusting hydraulic system, by being formed according to main overflow valve
The secondary pressure working method of pressure and pressure-relief valve setting pressure is set, in dynamical system idle running, using relatively low work
Pressure reduces the burden to dynamical system, engine is avoided to build the pressure flame-out.
Description of the drawings
Fig. 1 is the hydraulic schematic diagram that this secondary pressure adjusts hydraulic system Low-pressure load discharge state in embodiment one.
Fig. 2 is the hydraulic schematic diagram that this secondary pressure adjusts hydraulic system high pressure kicks state in embodiment one.
Fig. 3 is the hydraulic schematic diagram that this secondary pressure adjusts hydraulic system in embodiment two.
In figure, 1, oil intake assembly；2nd, main overflow valve；3rd, unloading valve；31st, oil circuit is controlled；4th, solenoid valve；5th, one-way stable point
Flow valve；6th, branch's oil circuit；P1, in-line；T, oil return line；CF, oil circuit is turned to；EF, oil circuit is performed；LS, course changing control oil circuit；
P2, auxiliary in-line；PS, current stabilization oil circuit.
Specific embodiment
It is specific embodiment of the utility model and with reference to attached drawing below, the technical solution of the utility model is made further
Description, but the utility model is not limited to these embodiments.
Embodiment one：
This secondary pressure, which adjusts hydraulic system, to be included in-line P1, oil return line T, turns to oil circuit CF, performs oil circuit EF, oil inlet
Component 1, main overflow valve 2, unloading valve 3, solenoid valve 4 and branch's oil circuit 6.
Specifically, as depicted in figs. 1 and 2, the connection in-line of oil intake assembly 1 P1 can simultaneously give and turn to oil circuit CF and perform oil
Road EF fuel feeding.In the present embodiment, oil intake assembly 1 is pressure-gradient control valve, and pressure-gradient control valve also has course changing control oil circuit LS.Main overflow valve 2 is set
It puts between oil circuit EF and oil return line T is performed, performs oil circuit EF and be interconnected with branch's oil circuit 6, branch's oil circuit 6 passes through unloading valve
3 couple oil return line T, and solenoid valve 4 is connected on the control oil circuit 31 of unloading valve 3, and the setting pressure of main overflow valve 2 is more than unloading valve
3 setting pressure.
As depicted in figs. 1 and 2, in the present embodiment, auxiliary in-line P2 is also associated on branch's oil circuit 6, aids in in-line
Characteristic of Priority Valve 5 is provided between P2 and branch's oil circuit 6.In-line P1 and auxiliary in-line P2 are supplied respectively by an oil pump
Oil, and the oil pump that other executing agencies may be employed gives auxiliary in-line P2 fuel feeding, to improve the work efficiency of executing agency.And
And the current stabilization oil circuit PS of Characteristic of Priority Valve gives other executing agency's fuel feeding, does not influence the normal table of other executing agencies
Work.
This secondary pressure adjust hydraulic system operation principle be：As shown in Figure 1, when dynamical system is in idling mode
When, the power-off of solenoid valve 4 makes unloading valve 3 be in unloading condition, performs oil circuit EF and aids in the hydraulic oil of in-line P2 in branch's oil
Road 6 collaborate after and pass through unloading valve 3 connect oil return line T oil returns so that perform oil circuit EF works under the setting pressure of unloading valve 3
Make so that executing agency works in a low voltage state, mitigates the burden to dynamical system, avoids engine misses.
As shown in Fig. 2, being when dynamical system is under fast state, the energization of solenoid valve 4 makes unloading valve 3 that can not open, and holds
Row oil circuit EF connects oil return line T with behind the hydraulic oil interflow of auxiliary in-line P2 by main overflow valve 2 so that performs oil circuit EF and exists
It works under the setting pressure of main overflow valve 2, executing agency is made to have the load capacity of bigger.
This secondary pressure adjusts hydraulic system by setting the unloading valve 3 that main overflow valve 2 and solenoid valve 4 control so that holds
Row mechanism can work under two kinds of operating pressures, realize secondary pressure control.Also, by setting Characteristic of Priority Valve
5, it gives hydraulic oil extra in the oil pump of other executing agencies to auxiliary in-line P2 fuel feeding, makes full use of other oil pumps extra
Flow, to improve the work efficiency of executing agency.Under dynamical system idling mode, it is flame-out to be avoided that engine builds the pressure；Power
When system high-speed operates, the performance of executing agency can be preferably played.
Embodiment two：
Technical solution in the present embodiment and the technical solution in embodiment one are essentially identical, the difference is that, this reality
It applies in example, as shown in figure 3, being not provided with auxiliary in-line P2 in the present embodiment, realizes that secondary pressure is adjusted by an oil pump.
The specific operation principle of the present embodiment is：When dynamical system is in idling mode, the power-off of solenoid valve 4 makes unloading valve
3 are in unloading condition, perform oil circuit EF and are connected with branch oil circuit 6 and pass through unloading valve 3 and connect oil return line T so that execution oil circuit
EF works under the setting pressure of unloading valve 3 so that executing agency works in a low voltage state, mitigates and dynamical system is born
Load, avoids engine misses.
It is that the energization of solenoid valve 4 makes unloading valve 3 that can not open when dynamical system is under fast state, performs oil circuit EF and lead to
It crosses main overflow valve 2 and connects oil return line T so that perform oil circuit EF and work under the setting pressure of main overflow valve 2, there is executing agency
The load capacity of bigger.
The specific embodiments described herein are merely examples of the spirit of the present invention.The utility model institute
Described specific embodiment can be done various modifications or additions or using similar by belonging to those skilled in the art
Mode substitute, but without departing from the spirit of the present application or beyond the scope of the appended claims.
Claims (4)
1. a kind of secondary pressure adjusts hydraulic system, including in-line (P1), oil return line (T), oil circuit (CF), execution oil circuit are turned to
(EF) and steering oil circuit (CF) can be given and performs the oil intake assembly (1) of oil circuit (EF) discharge pressure oil, the execution oil circuit
(EF) main overflow valve (2) is provided between oil return line (T), which is characterized in that the hydraulic system is further included with performing oil circuit
(EF) interconnected branch's oil circuit (6), branch's oil circuit (6) couple oil return line (T), the off-load by unloading valve (3)
Solenoid valve (4) is connected on the control oil circuit (31) of valve (3), the setting pressure of the main overflow valve (2) is more than unloading valve (3)
Set pressure.
2. secondary pressure according to claim 1 adjusts hydraulic system, which is characterized in that the hydraulic system further includes auxiliary
In-line (P2) is helped, the auxiliary in-line (P2) is connected with branch's oil circuit (6).
3. secondary pressure according to claim 2 adjusts hydraulic system, which is characterized in that the in-line (P1) and auxiliary
In-line (P2) is respectively by an oil pump feed.
4. secondary pressure according to claim 3 adjusts hydraulic system, which is characterized in that the auxiliary in-line (P2) and
Characteristic of Priority Valve (5) is provided between branch's oil circuit (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721448773.1U CN207421033U (en) | 2017-11-02 | 2017-11-02 | A kind of secondary pressure adjusts hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721448773.1U CN207421033U (en) | 2017-11-02 | 2017-11-02 | A kind of secondary pressure adjusts hydraulic system |
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| Publication Number | Publication Date |
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| CN207421033U true CN207421033U (en) | 2018-05-29 |
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ID=62306944
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| CN201721448773.1U Active CN207421033U (en) | 2017-11-02 | 2017-11-02 | A kind of secondary pressure adjusts hydraulic system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108637465A (en) * | 2018-07-12 | 2018-10-12 | 江苏锢邦智能装备有限公司 | A kind of inertia friction weld work system |
| CN110745744A (en) * | 2019-11-21 | 2020-02-04 | 浙江海宏液压科技股份有限公司 | Oil inlet valve group structure in forklift double-pump hydraulic system |
| CN113357210A (en) * | 2021-06-28 | 2021-09-07 | 三一汽车起重机械有限公司 | Cylinder arm pin hydraulic control system with flow compensation function and operation machine |
-
2017
- 2017-11-02 CN CN201721448773.1U patent/CN207421033U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108637465A (en) * | 2018-07-12 | 2018-10-12 | 江苏锢邦智能装备有限公司 | A kind of inertia friction weld work system |
| CN110745744A (en) * | 2019-11-21 | 2020-02-04 | 浙江海宏液压科技股份有限公司 | Oil inlet valve group structure in forklift double-pump hydraulic system |
| CN113357210A (en) * | 2021-06-28 | 2021-09-07 | 三一汽车起重机械有限公司 | Cylinder arm pin hydraulic control system with flow compensation function and operation machine |
| CN113357210B (en) * | 2021-06-28 | 2023-10-13 | 三一汽车起重机械有限公司 | Cylinder arm pin hydraulic control system with flow compensation function and working machine |
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