CN209586813U - A kind of bull-dozer leading hydraulic system - Google Patents
A kind of bull-dozer leading hydraulic system Download PDFInfo
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- CN209586813U CN209586813U CN201920247963.XU CN201920247963U CN209586813U CN 209586813 U CN209586813 U CN 209586813U CN 201920247963 U CN201920247963 U CN 201920247963U CN 209586813 U CN209586813 U CN 209586813U
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Abstract
A kind of bull-dozer leading hydraulic system, it is related to bull-dozer technical field, including valve group A, accumulator, proportioning valve, pilot valve A, pilot valve B, reversal valve A and reversal valve B, the valve group A includes sequentially connected check valve, pressure reducing valve and precursor overflow valve, the proportioning valve is 2/2-way direction valve, the check valve left port is a mouthfuls, b mouthfuls are linked between pressure reducing valve and precursor overflow valve, described a mouthfuls is connected to bull-dozer work pump discharge, valve group A oil return opening connects fuel tank, described b mouthfuls connects accumulator simultaneously, the oil inlet p1 and proportioning valve right end control terminal hydraulic fluid port of pilot valve A and pilot valve B；The pilot valve A and pilot valve B is connected to the first guide cavity of reversal valve A and the both ends reversal valve B, pilot system is integrated into work system by this bull-dozer leading hydraulic system, a pump is shared with work system, hydraulic system is simplified, saves arrangement space and manufacturing cost.
Description
Technical field:
The utility model relates to bull-dozer technical field more particularly to a kind of bull-dozer leading hydraulic systems.
Background technique:
For bull-dozer hydraulic system of working generally using core type operating valve form is opened, operating valve can be using hydraulic control or mechanical behaviour
Vertical mode.Oil liquid when bulldozer perching knife does not work from working barrel is through position oil return box in operating valve.When using hydraulic control mode
An independent pioneer pump is often configured to go to realize work spool commutation function to provide oil sources for leading hydraulic system.First simultaneously
Guiding systems will also configure precursor overflow valve group and respective line design.Hydraulic system of bulldozer is built in bull-dozer rack vehicle body
Portion, inner space is limited, needs to arrange that the hydrostatic bull-dozer of the gearbox of running gear, torque-converters will arrange walking duplex pump
Deng, the fan pump of working barrel, slippage pump, pioneer pump, temperature-controlled fan system and related oil suction oil outlet pipe, vehicle body is caused
Narrow space, it is in the prior art in pioneer pump leading hydraulic system occupied space it is big, be vehicle body space layout
Cause inconvenience.
Utility model content:
In order to solve the above-mentioned technical problem, the utility model provides a kind of bull-dozer leading hydraulic system, and no setting is required
Independent pioneer pump, saves space hold and manufacturing cost.
The utility model is realized by following technical proposals:
A kind of bull-dozer leading hydraulic system, characterized in that including valve group A, accumulator, proportioning valve, pilot valve A, guide
Valve B, reversal valve A and reversal valve B, the valve group A include sequentially connected check valve, pressure reducing valve and precursor overflow valve, institute
Stating proportioning valve is 2/2-way direction valve, and the check valve left port is a mouthfuls, and b is linked between pressure reducing valve and precursor overflow valve
Mouthful, described a mouthfuls is connected to bull-dozer work pump discharge, and valve group A oil return opening connects fuel tank, and described b mouthfuls connects accumulator, elder generation simultaneously
The oil inlet p1 and proportioning valve right end control terminal hydraulic fluid port of pilot valve A and pilot valve B；The pilot valve A and pilot valve B are separately connected
In the first guide cavity of reversal valve A and the both ends reversal valve B.
In the other side of the utility model, the spring pressure setting value size of the proportioning valve and reversal valve A with
And to fully open pressure equal for reversal valve B spool.
In the other side of the utility model, the reversal valve A is connected with oil cylinder A, and the reversal valve B is connected with oil
Cylinder B.
It further include pressure switch in the other side of the utility model, the pressure detecting of the pressure switch
Mouth is connected with the import of accumulator, and the terminal A of the pressure switch is connected to proportioning valve right end electromagnet port, the pressure
The terminal B of relay connects power supply.
The beneficial effects of the utility model are: pilot system is integrated into work system by this bull-dozer leading hydraulic system
In, a pump is shared with work system, hydraulic system is simplified, saves arrangement space and manufacturing cost.
Detailed description of the invention:
Fig. 1 is 1 structural schematic diagram of the utility model embodiment.
Fig. 2 is 2 structural schematic diagram of the utility model embodiment.
In attached drawing: 1, valve group A, 101, check valve, 102, pressure reducing valve, 103, precursor overflow valve, 2, proportioning valve, 3, reversal valve
A, 4, reversal valve B, 5, pilot valve B, 6, pilot valve A, 8, accumulator, 801, the import of accumulator, 9, pressure switch, 901, pressure
Power detection mouth, 902, terminal A, 903, terminal B, 10, oil cylinder B, 11, oil cylinder A, 12, working barrel.
Specific embodiment:
The embodiments of the present invention is described further with reference to the accompanying drawings and embodiments:
In the description to the utility model, it is to be understood that indicating position or positional relationship are described as based on attached
Orientation or positional relationship shown in figure, is merely for convenience of describing the present invention and simplifying the description, rather than indication or suggestion
Signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to this
The limitation of utility model protection range.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is set
Set ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
Increase settable orifice in the oil return line of position using in opening core pilot operated valve device, settable orifice is made to be in different conditions
Realize pilot operated valve device itself integrated leading control function.System oil liquid passes through restriction when restriction throttle (or completely closing)
Generate pressure drop come for pilot system accumulator pressurizing and provide hydraulic control valve core unlatching a pressure.Hereafter in pilot handle
After " first time " operates liquor controlled multipath commutation, the pressure of pilot system is depressurized to for settable orifice by main system load pressure
It is fully open.After the valve core that works is in commutation, when load pressure is reduced below pressure reducing valve setting value, restriction is to store
Standard-sized sheet can be maintained under the effect of device pressure, when workload pressure is higher than leading hydraulic system pressure at this time, hydraulic system of working pressure
Power maintains the state of restriction standard-sized sheet through the pressure of pressure reducing valve to leading hydraulic system, while being accumulator pressurising again.Work as hand
Position in handle, in pilot operated valve device when position, accumulator state of pressure keeping in pilot system at this time, to be maintained to restriction full-gear.
In pilot operated valve device behind position, restriction throttling standard-sized sheet under energy storage pressure effect loses the directly middle position of oil liquid of the throttling action from pump
Oil return does not generate restriction loss.As long as pilot system pressure holding function exists, this restriction is unanimously shown in a fully open operation.
Embodiment 1
A kind of bull-dozer leading hydraulic system, as shown in Figure 1, include valve group A1, accumulator 8, proportioning valve 2, pilot valve A6,
Pilot valve B5, reversal valve A3 and reversal valve B4, the valve group A1 include sequentially connected check valve 101, pressure reducing valve 102 and
Precursor overflow valve 103, the proportioning valve 2 are 2/2-way direction valve, and 101 left port of check valve is a mouthfuls, pressure reducing valve 102
B mouthfuls are linked between precursor overflow valve 103, described a mouthfuls is connected to the outlet of bull-dozer working barrel 12, the connection of valve group A1 oil return opening
Fuel tank, described b mouthfuls connects the 2 right end control terminal of oil inlet p1 and proportioning valve of accumulator 8, pilot valve A6 and pilot valve B5 simultaneously
Hydraulic fluid port；The pilot valve A6 and pilot valve B5 is connected to the first guide cavity of reversal valve A3 and the both ends reversal valve B4.The ratio
It is equal that the spring pressure setting value size of valve 2 with reversal valve A3 and reversal valve B4 spool fully opens pressure.The reversal valve
A3 is connected with oil cylinder A11, and the reversal valve B4 is connected with oil cylinder B10.
Pilot valve A6, pilot valve B5 are respectively equipped with pilot handle.Wherein proportioning valve 2 is 2/2-way direction valve, open,
It closes and is completed by under its right side control pressure and left side action of reset spring.Wherein a mouth of valve group A1 is connected to pump discharge,
C mouthfuls of oil recirculating port connecting tanks, b mouthfuls of connection accumulator connectors connect pilot valve A6 and pilot valve B5 oil inlet p1, proportioning valve 2 simultaneously
Right end control terminal hydraulic fluid port.
Starting engine is completed in machine assembly, and the hydraulic oil at this time from working barrel 12 passes through valve reversal valve A3 all the way, changes
2 mouthfuls of proportioning valve cut-offs are reached to valve B4 internal galleries.Enter valve group A1 through A1 mouthfuls of valve group all the way, is arrived by pressure reducing valve 102 through b mouthfuls
P1 mouth up to 2 right end control terminal of proportioning valve, pilot valve A6 and pilot valve B5 ends.As work pump discharge pressure increases, ratio
2 right end of valve control end pressure also increases with it, and when pressure is equal with left side reset spring, 2 spool of proportioning valve starts to move, than
The example opening of valve 2 slowly becomes larger, when opening reaches a timing pump discharge pressure (2 right end of proportioning valve controls end pressure) and spring at this time
Pressure is equal, and spool is made to maintain equilibrium state, pumps the hydraulic oil liquid come at this time and returns to fuel tank by the throttling of proportioning valve 2.At this time
The pressure that the throttling of proportioning valve 2 generates just is pump discharge pressure, also sets pressure for spring.Its setting value size of spring and reversal valve
A3, that reversal valve B4 spool fully opens pressure is equal.Under such state, energy storage pressure is equal with pump discharge pressure.Then may be used
With operated pilot valve handle, the hydraulic oil from valve group A1 reaches one end of reversal valve A3 or reversal valve B4 by pilot valve, beats
Valve opening core, the hydraulic oil from pump enter oil cylinder 10 or oil cylinder 11 by reversal valve A3 or reversal valve B4.When load pressure is greater than
When 102 setting value of pressure reducing valve of valve group A1, the pressure from working barrel enters pilot system by decompression again, commutates by entering
The first guide cavity of valve A3 or reversal valve B4, the right end control terminal of proportioning valve 2 fully open proportioning valve 2.Remaining passes through guide's overflow
Valve overflow, accumulator carries out pressurising under pressure oil effect at this time.When position, reversal valve A3 or reversal valve in pilot handle recovery
B4 spool is restored to middle position, at this time pilot system pressure maintaining under the action of accumulator 8, check valve 101, and proportioning valve 2 is storing at this time
Right position standard-sized sheet work can be still kept under the action of device pressure maintaining, reach fuel tank by proportioning valve 2 from pump oil liquid at this time and return
Oil.
The present embodiment after the completion of first time machine assembly from vehicle the filling liquid pressure holding function of pilot system once can be realized.
When equipment is without operational requirements, is i.e. self pressure holding function of pilot system is relied in reversal valve A3, reversal valve B4 when position, will be compared
Example valve 2, which fully opens, realizes working barrel by position oil return function in reversal valve A3, reversal valve B4.When equipment has movement demand
In working hour, energy storage pressure is opened reversal valve A3, reversal valve B4 by pilot valve A6, pilot valve B5 when operated pilot handle, this
When the decompression of load pressure oil after for pilot valve A6, pilot valve B5,2 standard-sized sheet of proportioning valve provide pressure oil-source, accumulator pressurising again
Reach specified state of pressure keeping.
Embodiment 2
A kind of bull-dozer leading hydraulic system, as shown in Figure 2.Including valve group A1, accumulator 8, proportioning valve 2, pilot valve A6,
Pilot valve B5, reversal valve A3 and reversal valve B4, the valve group A1 include sequentially connected check valve 101, pressure reducing valve 102 and
Precursor overflow valve 103, the proportioning valve 2 are 2/2-way direction valve, and 101 left port of check valve is a mouthfuls, pressure reducing valve 102
B mouthfuls are linked between precursor overflow valve 103, described a mouthfuls is connected to the outlet of bull-dozer working barrel 12, the connection of valve group A1 oil return opening
Fuel tank, described b mouthfuls connects the 2 right end control terminal of oil inlet p1 and proportioning valve of accumulator 8, pilot valve A6 and pilot valve B5 simultaneously
Hydraulic fluid port；The pilot valve A6 and pilot valve B5 is connected to the first guide cavity of reversal valve A3 and the both ends reversal valve B4.The commutation
Valve A3 is connected with oil cylinder A11, and the reversal valve B4 is connected with oil cylinder B10.It further include pressure switch 9, the pressure switch 9
Pressure detecting mouth 901 be connected with the import 801 of accumulator, it is right that the terminal A902 of the pressure switch 9 is connected to proportioning valve 2
Electromagnet port is held, the terminal B903 of the pressure switch 9 connects power supply.
2 difference from Example 1 of embodiment is using 2/2-way direction valve and pressure switch with proportioning valve 2
9 complete the pressure holding function of pilot system.Wherein proportioning valve 2 is normally opened.The pressure maintaining of pressure switch pressure detecting pilot system
Situation, when pressure is lower than setting value, pressure switch 9 connects the signal line of proportioning valve 2.
After the completion of machine assembly, due to not filling oil in pilot system also, the pressure of accumulator is very low at this time, pressure relay
Device 9 detects that lower than setting value, the circuit of proportioning valve 2 is connected in pilot system pressure, and so that proportioning valve 2 is obtained electric work in right position will
Position oil return ends in operating valve.Enter operating valve from working barrel hydraulic oil at this time and reach the cut-off of proportioning valve 2, another oil circuit is through list
The pilot handle of pilot valve A6, pilot valve B5 are then reached to valve 101, pressure reducing valve 102, A1b mouthfuls of valve group, arrival accumulator 8,
Position is ended in handle.Relay pressure detecting mouth 901 is connected with 802 mouthfuls of accumulator import simultaneously.Relay terminal A902 connects
It is connected to 2 right end electromagnet port of proportioning valve, terminal B903 connects power supply.As pilot pressure increases up to the specified pressure of overflow valve 103
When power, the triggering of pressure switch 9 disconnects 2 circuit of proportioning valve, and the left position under action of reset spring of proportioning valve 2 works, and will come from work
Make pump liquid pressure oil and passes through position oil return in reversal valve A3, reversal valve B4 to fuel tank.Pilot system prevents under the action of check valve 101
The reflux of pilot system internal oil, pilot system is in state of pressure keeping under the effect of accumulator 8.
When bulldozer perching knife has movement demand, the pilot handle of operated pilot valve A6, pilot valve B5 are released in accumulator 8
Under the action of putting pressure oil-source, reversal valve A3, reversal valve B4 spool complete commutation action, when hydraulic system of working load is lower than first
When guiding systems pressure, check valve 101 is in close state under the effect of pilot system pressure.When hydraulic system of working pressure is greater than
Pressure oil of the pilot system pressure from working barrel enters pilot system through pressure reducing valve 102 through check valve 101, mentions for pilot system
For power oil sources.A portion is 8 pressurising of accumulator, so that accumulator 8 is kept the rated pressure state of setting, a part is through overflowing
Stream valve overflow enters reversal valve A3, the promotion spool movement of reversal valve B4 elder generation's guide cavity through pilot valve A6, pilot valve B5, completes commutation
Movement.
In short, the above is only the preferred embodiment of the present invention, it is all according to present utility model application the scope of the patents institute
The equivalent changes and modifications of work should all belong to the covering scope of the utility model patent.
Claims (4)
1. a kind of bull-dozer leading hydraulic system, characterized in that including valve group A(1), accumulator (8), proportioning valve (2), pilot valve
A(6), pilot valve B(5), reversal valve A(3) and reversal valve B(4), the valve group A(1) include sequentially connected check valve
(101), pressure reducing valve (102) and precursor overflow valve (103), the proportioning valve (2) are 2/2-way direction valve, the check valve
(101) left port is a mouthfuls, b mouthfuls is linked between pressure reducing valve (102) and precursor overflow valve (103), described a mouthfuls is connected to soil-shifting
Machine working barrel (12) outlet, valve group A(1) oil return opening connection fuel tank, described b mouthfuls connects accumulator (8), pilot valve A(6 simultaneously) and
Pilot valve B(5) oil inlet p1 and proportioning valve (2) right end control terminal hydraulic fluid port；The pilot valve A(6) and pilot valve B(5) point
Be not connected to reversal valve A(3) and reversal valve B(4) both ends first guide cavity.
2. a kind of bull-dozer leading hydraulic system according to claim 1, which is characterized in that the bullet of the proportioning valve (2)
It is equal that spring pressure set points size with reversal valve A(3) and reversal valve B(4) spool fully opens pressure.
3. a kind of bull-dozer leading hydraulic system according to claim 1, which is characterized in that the reversal valve A(3) connection
Have oil cylinder A(11), the reversal valve B(4) it is connected with oil cylinder B(10).
4. a kind of bull-dozer leading hydraulic system according to claim 1, which is characterized in that further include pressure switch
(9), the pressure detecting mouth (901) of the pressure switch (9) is connected with the import (801) of accumulator, the pressure switch
(9) terminal A(902) it is connected to proportioning valve (2) right end electromagnet port, the terminal B(903 of the pressure switch (9)) connect
Power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920247963.XU CN209586813U (en) | 2019-02-27 | 2019-02-27 | A kind of bull-dozer leading hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920247963.XU CN209586813U (en) | 2019-02-27 | 2019-02-27 | A kind of bull-dozer leading hydraulic system |
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| Publication Number | Publication Date |
|---|---|
| CN209586813U true CN209586813U (en) | 2019-11-05 |
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| CN201920247963.XU Active CN209586813U (en) | 2019-02-27 | 2019-02-27 | A kind of bull-dozer leading hydraulic system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113090603A (en) * | 2021-03-29 | 2021-07-09 | 徐州徐工挖掘机械有限公司 | Pilot proportional control valve device, automatic calibration method, and medium |
-
2019
- 2019-02-27 CN CN201920247963.XU patent/CN209586813U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113090603A (en) * | 2021-03-29 | 2021-07-09 | 徐州徐工挖掘机械有限公司 | Pilot proportional control valve device, automatic calibration method, and medium |
| CN113090603B (en) * | 2021-03-29 | 2022-04-05 | 徐州徐工挖掘机械有限公司 | Pilot proportional control valve device, automatic calibration method, and medium |
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