CN205823768U - A kind of quarry tipper pilot-operated type pressure limits Variable Control hydraulic system - Google Patents
A kind of quarry tipper pilot-operated type pressure limits Variable Control hydraulic system Download PDFInfo
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- CN205823768U CN205823768U CN201620755732.6U CN201620755732U CN205823768U CN 205823768 U CN205823768 U CN 205823768U CN 201620755732 U CN201620755732 U CN 201620755732U CN 205823768 U CN205823768 U CN 205823768U
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- oil
- switching valve
- valve group
- pressure
- pilot
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Abstract
The utility model discloses a kind of quarry tipper pilot-operated type pressure and limit Variable Control hydraulic system, it is characterised in that: include plunger pump system, switching valve group system, steering cylinder system and the fuel tank being sequentially connected with by oil circuit；Plunger pump system to steering cylinder system fuel feeding thus controls the duty of steering cylinder by switching valve group system；Being also associated with unloader between plunger pump system and switching valve group, the oil-in of unloader connects the working connection of plunger pump system, oil-out connects fuel tank, and the oil-in of switching valve group and the control port of unloader are connected to control spool and open and close.The beneficial effects of the utility model are: can meet the minimum steering pressure requirement of steering, and hydraulic oil pump can be made again to be in standby zero-pressure off-load in the case of system pressure meets.
Description
Technical field
This utility model belongs to engineering machinery hydraulic and controls technical field, is specifically related to a kind of quarry tipper pilot-operated type pressure
Power limits Variable Control hydraulic system.
Background technology
Along with being on the rise of global energy problem in short supply, large-scale highway quarry tipper power saving is the most increasingly subject to
To the attention of people, engineering machinery is proposed strict demand at aspects such as energy-saving and environmental protection.
Utility model content
The purpose of this utility model is to overcome deficiency of the prior art, it is provided that a kind of quarry tipper pilot-operated type pressure
Limiting Variable Control hydraulic system, when load pressure reaches the maximum pressure of default, pump can realize standby zero-pressure off-load, directly
To the lower limit of arrival system pressure setting value, pump starts to load fuel feeding, subsequently into next cycle of operation.
For solving prior art problem, the utility model discloses a kind of quarry tipper pilot-operated type pressure and limit variable control
Hydraulic system processed, including the plunger pump system being sequentially connected with by oil circuit, switching valve group system, steering cylinder system and oil
Case；Plunger pump system to steering cylinder system fuel feeding thus controls the duty of steering cylinder by switching valve group system；Post
Being also associated with unloader between plug pumping system and switching valve group, the oil-in of unloader connects the working connection of plunger pump system, goes out
Hydraulic fluid port connects fuel tank, and the oil-in of switching valve group and the control port of unloader are connected to control spool and open and close.
Preferably, it is also associated with high pressure filter between plunger pump system and switching valve group system.
Preferably, the oil circuit between oil-in and the high pressure filter of switching valve group system is provided with check valve.
Preferably, it is additionally provided with overflow valve between oil-in and one of them oil-out of switching valve group, going out of overflow valve
Hydraulic fluid port is connected with fuel tank.
Preferably, also include accumulator, in the hydraulic fluid port of accumulator and switching valve group system between oil-in and oil-out
Working oil path connects.
This utility model has the advantages that by pilot-operated type oil circuit control feedback load pressure, constantly adjusts plunger
The flow control valve of pump, makes system pressure maintain all the time between on-load pressure and unloading pressure, can meet steering
Minimum steering pressure requirement, can make again hydraulic oil pump be in standby zero-pressure off-load, this benefit in the case of system pressure meets
Oil mode, the range of pressure fluctuations making accumulator is little, has the service life extending accumulator, when accumulator need not repairing,
Prexxure of the hydraulic pump, flow are all down to minimum, the energy loss of system are minimized, and energy saving of system effect is best, reduce engineering
Machinery hydraulic system caloric value, thus alleviate hydraulic system heat abstractor burden, reduce the abrasion to oil distribution casing, extend making of pump
With the life-span, decrease the energy consumption of system, make the efficiency of system reach the highest.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
Reference:
1 plunger displacement pump；2 flow control valves；3 pump recuperation valves；4 unloaders；5 high pressure filters；6 switching valve group systems；7 overflows
Valve；8 accumulators；9 flux amplification valves；10 hydro-steering oil circuits；11 steering cylinders.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is further described.Following example are only used for this is clearly described
The technical scheme of utility model, and protection domain of the present utility model can not be limited with this.
As it is shown in figure 1, a kind of quarry tipper pilot-operated type pressure limits Variable Control hydraulic system, including plunger displacement pump 1 it is
System, high pressure filter 5, switching valve group system 6, steering cylinder 11 system, accumulator 8, fuel tank.Plunger displacement pump 1 system is by turning to
Valve set system 6 is to steering cylinder 11 system fuel feeding thus controls the duty of steering cylinder 11, and plunger displacement pump 1 system passes through oil return
Road connects fuel tank.The hydraulic fluid port of accumulator 8 is connected with working oil path between oil-in with oil-out in switching valve group system 6, turns
It is provided with check valve on the oil circuit between the oil-in and high pressure filter 5 of valve set system 6.The oil-in of switching valve group and its
In be additionally provided with overflow valve 7 between an oil-out, the oil-out of overflow valve 7 is connected with fuel tank.
Being also associated with unloader 4 between plunger displacement pump 1 system and switching valve group, the oil-in of unloader 4 connects plunger displacement pump 1 and is
The working connection of system, oil-out connect fuel tank, and the oil-in of switching valve group is connected to control spool with the control port of unloader 4
Open and close.Plunger displacement pump 1 also includes flow control valve 2 and pump recuperation valve 3, and the pressure of original plunger displacement pump 1 system is by flow control valve 2 He
Pump recuperation valve 3 controls, when pressure-overload pressure oil is passed straight back in fuel tank by pump recuperation valve 3.After unloader 4, it is
The excessive spool directly making unloader 4 of system pressure is opened thus is carried out off-load.
Steering cylinder 11 system includes steering cylinder 11, hydro-steering oil circuit 10 and flux amplification valve 9.
Operation principle of the present utility model and process
Just set the setting pressure P1 of pump recuperation valve 3, unloader 4 on-load pressure P2, unloader 4 unloading pressure P3, system pressure
Power P4, and P1 ＞ P3 ＞ P2
1. bootstrap process: when load pressure is not up to the maximum set pressure of controller, pump is all the time under delivery
Work.
After plunger displacement pump 1 starts, the high-pressure oil flow from pump is drawn by a high pressure filter 5 and switching valve group system 6
Being directed at accumulator 8, flow amplifier 9, hydro-steering oil circuit 10 and steering cylinder 11, plunger displacement pump 1 is fuel feeding in accumulator 8,
System pressure P4 is gradually increasing, and overflow valve 7 is used for making relief valve, prevents steering hypertonia.
Now, the pressure that plunger displacement pump 1 produces is applied to flow control valve 2 and recuperation valve 3 spool, and accumulator oil pressure is by first
Lead oil circuit control and fed back to the control of unloader by load circuit (i.e. switching valve group system is connected oil circuit with unloader control port)
Liquefaction mouth, now unloader 4 spool equilibrium equation by P1 ＞ P3 ＞ P2 ＞ P4+Fs to P1 ＞ P3 ＞ P4+Fs ＞ P2 transition, but
Unloader is closed all the time, and flow control valve 2 spool is in right position duty, makes the right chamber of plunger displacement pump 1 by pressure
Force control valve and flow control valve 2 connect release with fuel tank, and left chamber still acts on the outlet pressure of plunger displacement pump, at this moment plunger displacement pump
1 pivot angle increases, and the output flow of plunger displacement pump 1 continues to increase, i.e. system is in stress state.
2. system uninstallation process: when system pressure reaches the maximum pressure of default, plunger displacement pump 1 can accomplish standby zero
Pressure off-load.
Along with plunger displacement pump 1 is to accumulator 8 fuel feeding, hydraulic system pressure improves constantly, now the spool dynamic balance of unloader
Equation is become P1 ＞ P3=P4+Fs ＞ P2 from P1 ＞ P3 ＞ P4+Fs ＞ P2, and now unloader 4 spool is opened, flow control valve 2 work
Making in left position, at this moment the chamber, left and right two of plunger displacement pump 1 all acts on identical pressure, and owing to left chamber spring-force driven dual makes plunger displacement pump 1
Pivot angle is reduced to zero, and at this moment system pressure maintains more than P2, but plunger displacement pump 1 output flow is close to zero.Therefore, plunger displacement pump 1
Output also close to zero standby zero-pressure off-load.
As system pressure P2 >=P4, system recovery loading procedure, circulates the loading of hydraulic system, uninstall process.
By pilot-operated type oil circuit control feedback load pressure, constantly adjust the flow control valve 2 of plunger displacement pump 1, make system pressure
Power maintains between P2-P3 all the time, can meet the minimum steering pressure requirement of steering, and hydraulic oil pump can be made again in system
Pressure is in standby zero-pressure off-load in the case of meeting, and this repairing mode, the range of pressure fluctuations making accumulator is little, has prolongation
In the service life of accumulator, when accumulator need not repairing, prexxure of the hydraulic pump, flow are all down to minimum, by the energy of system
Loss is minimized, and energy saving of system effect is best, reduces construction machinery hydraulic system caloric value, thus alleviates hydraulic system heat radiation
Device is born, and reduces the abrasion to oil distribution casing, extends the service life of pump, decreases the energy consumption of system, make the efficiency of system reach
To the highest.
The above is only preferred implementation of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of without departing from this utility model know-why, it is also possible to make some improvement and deformation, these change
Enter and deform and also should be regarded as protection domain of the present utility model.
Claims (5)
1. a quarry tipper pilot-operated type pressure limits Variable Control hydraulic system, it is characterised in that: include being depended on by oil circuit
The plunger pump system of secondary connection, switching valve group system, steering cylinder system and fuel tank；Plunger pump system passes through switching valve system
System is to steering cylinder system fuel feeding thus controls the duty of steering cylinder；It is also connected with between plunger pump system and switching valve group
Having unloader, the oil-in of unloader connects the working connection of plunger pump system, oil-out connects fuel tank, the oil-in of switching valve group
Control port with unloader is connected to control spool and opens and closes.
A kind of quarry tipper pilot-operated type pressure the most according to claim 1 limits Variable Control hydraulic system, its feature
It is, between plunger pump system and switching valve group system, is also associated with high pressure filter.
A kind of quarry tipper pilot-operated type pressure the most according to claim 2 limits Variable Control hydraulic system, its feature
It is, the oil circuit between oil-in and the high pressure filter of switching valve group system is provided with check valve.
A kind of quarry tipper pilot-operated type pressure the most according to claim 1 limits Variable Control hydraulic system, its feature
It is, is additionally provided with overflow valve between oil-in and one of them oil-out of switching valve group, the oil-out of overflow valve and fuel tank
Connect.
A kind of quarry tipper pilot-operated type pressure the most according to claim 1 limits Variable Control hydraulic system, its feature
Being, also include accumulator, in the hydraulic fluid port of accumulator and switching valve group system, the working oil path between oil-in and oil-out is even
Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620755732.6U CN205823768U (en) | 2016-07-19 | 2016-07-19 | A kind of quarry tipper pilot-operated type pressure limits Variable Control hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620755732.6U CN205823768U (en) | 2016-07-19 | 2016-07-19 | A kind of quarry tipper pilot-operated type pressure limits Variable Control hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205823768U true CN205823768U (en) | 2016-12-21 |
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ID=57563405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620755732.6U Active CN205823768U (en) | 2016-07-19 | 2016-07-19 | A kind of quarry tipper pilot-operated type pressure limits Variable Control hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205823768U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110843908A (en) * | 2019-10-28 | 2020-02-28 | 中国煤炭科工集团太原研究院有限公司 | Narrow mining trackless vehicle power bogie and walking steering control system |
-
2016
- 2016-07-19 CN CN201620755732.6U patent/CN205823768U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110843908A (en) * | 2019-10-28 | 2020-02-28 | 中国煤炭科工集团太原研究院有限公司 | Narrow mining trackless vehicle power bogie and walking steering control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190404 Address after: 221005 39 Gaoxin Road, Xuzhou Economic Development Zone, Jiangsu Patentee after: Xuzhou Xugong Mining Machinery Co., Ltd. Address before: 221005 39 Gaoxin Road, Xuzhou Economic Development Zone, Jiangsu Patentee before: XCMG Excavator Machinery Co., Ltd. |
|
| TR01 | Transfer of patent right |