CN208565105U - A kind of device for eliminating load sensitive system hydraulic shock - Google Patents
A kind of device for eliminating load sensitive system hydraulic shock Download PDFInfo
- Publication number
- CN208565105U CN208565105U CN201721574324.1U CN201721574324U CN208565105U CN 208565105 U CN208565105 U CN 208565105U CN 201721574324 U CN201721574324 U CN 201721574324U CN 208565105 U CN208565105 U CN 208565105U
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- hydraulic
- valve
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- protecting against
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Abstract
A kind of device for eliminating load-sensitive hydraulic shock provided by the utility model, including the protecting against shock valve being arranged on load-sensitive hydraulic system major loop, the hydraulic of the protecting against shock valve is greater than the hydraulic of major loop；The utility model is based on bypass aerial drainage principle, protecting against shock valve is set on the major loop of load-sensitive hydraulic system, and by protecting against shock valve it is hydraulic be set greater than it is hydraulic on major loop, when on major loop it is hydraulic greater than protecting against shock valve be arranged in it is hydraulic when, protecting against shock valve goes out extra fluid-evacuation；The device of the utility model design has certain practical value to system stability and reliability is improved.
Description
Technical field
The utility model belongs to engineering machinery field, and in particular to a kind of dress for eliminating load sensitive system hydraulic shock
It sets.
Background technique
Load sensitive system be it is a kind of can automatically for load the hydraulic circuit of required flow and pressure be provided, be widely applied
In engineering machinery field, such as excavator, land leveller, synchronous macadam seal paver, pitch sprinkling car.Relative to traditional hydraulic pressure system
System, the load sensitive system being made of load sensitive pump and multi-way valve have it is compact-sized, can effectively avoid the excellent of spill losses
Point.But in multi-way valve closing process, since the adjustment speed of hydraulic pump discharge lags behind the closing velocity of multi-way valve, extra stream
Amount is gathered in pipeline, can generate big compression shock, when especially main valve instantaneously opens and closes, surge can be more than even system
Rated pressure, influence job stability and reliability, while causing the loosening of vibration noise, connector, reduce the work of equipment
Make efficiency and even damages equipment.
In terms of eliminating system shock, increasing accumulator can reduce system pressure impact, but reduce system simultaneously
Response speed, and the structural parameters of accumulator and running parameter have certain limitation to its effect." load is quick for Chinese patent at present
Sensing system and hoisting system protecting against shock control method " (publication number: CN105221502A) it is disclosed using pressure compensator to being
System impact carries out elimination presence: 1) system generates closing speed of the discharge capacity control lag in main valve that the reason of impacting is variable pump
The mutation of flow system flow is spent and caused, and generates compression shock with the interaction of external loading；2) using pressure-compensated valve
The effect of anti-hydraulic shock does not specify simultaneously.
Summary of the invention
The purpose of this utility model is to provide a kind of devices for eliminating load sensitive system hydraulic shock, solve existing
Load sensitive system in, big compression shock can be generated in multi-way valve closing process, influences job stability and reliability, together
The loosening of Shi Yinqi vibration noise, connector, the working efficiency for reducing equipment even damage the defect of equipment.
In order to achieve the above object, the technical solution adopted in the utility model is:
A kind of device for eliminating load sensitive system hydraulic shock provided by the utility model, including be arranged in load-sensitive
Protecting against shock valve on hydraulic system major loop, the hydraulic of the protecting against shock valve are greater than the hydraulic of major loop.
Preferably, the protecting against shock valve is connect with the load sensitive pump on load-sensitive hydraulic system, and the protecting against shock
Valve it is hydraulic be greater than load sensitive pump caused by it is hydraulic.
Preferably, the protecting against shock valve includes four A interface, B interface, C interface and D interface external tappings, wherein A interface
The oil outlet of load sensitive pump is connect with C interface；B interface connects the oil return inlet T of load sensitive pump；D interface external load is sensitive
The load-sensitive mouth of pump.
Preferably, the protecting against shock valve further includes for adjusting the hydraulic adjustable spring E of protecting against shock valve, the adjustable spring
E and D interface are placed in the same end.
Preferably, protecting against shock valve using closed type pilot control valve.
Preferably, the protecting against shock valve is using floating type screw-in cartridge valve.
Compared with prior art, the utility model has the beneficial effects that
A kind of device for eliminating load sensitive system hydraulic shock provided by the utility model, is based on bypass aerial drainage principle,
Protecting against shock valve is set on the major loop of load-sensitive hydraulic system to control the hydraulic of pump discharge and negative-feedback mouth, and by erosion control
Hit valve it is hydraulic be set greater than it is hydraulic on major loop, when on major loop it is hydraulic be greater than protecting against shock valve be arranged in it is hydraulic
When, protecting against shock valve excretes out extra flow, and the lag of main valve opening and closing moment pumpage is effectively inhibited to make flow system flow mistake
Hydraulic shock caused by more.The device of the utility model design has very high response characteristic, and use is simple and reliable, can be certain
The interior control pump discharge pressure of range is hydraulic with load-sensitive pressure, has certain reality to system stability and reliability is improved
With value.
Detailed description of the invention
Fig. 1 be the utility model relates to elimination compression shock device structural schematic diagram；
Fig. 2 is schematic diagram when protecting against shock valve does not work；
Schematic diagram when Fig. 3 is the work of protecting against shock valve；
Fig. 4 is using the comparison diagram before and after protecting against shock valve；
Wherein, 1, hydraulic oil container 2, liquidometer 3, air cleaner 4, return filter 5, motor 6, load are quick
Sense pump 7, overflow valve 8, protecting against shock valve 9, load sensing multi-way valve 10, check valve 11, switching ball 12, Manual pilot formula
Overflow valve 9-1, shuttle valve 9-2, pressure compensator 9-3, main valve.
Specific embodiment
With reference to the accompanying drawing, the utility model is further described.
As shown in Figure 1, a kind of device for eliminating load sensitive system hydraulic shock provided by the utility model, including erosion control
Valve 8 is hit, the protecting against shock valve 8 is arranged between load sensitive pump 6 and load sensing multi-way valve 9.
For the protecting against shock valve 8 using floating type screw-in cartridge valve, which is the pilot control valve of closed type, therein
2 logical reversal valves are switching device.
The protecting against shock valve 8 includes A interface, B interface, C interface, D interface and adjustable spring E, wherein A interface and C interface
The oil outlet of load sensitive pump 6 is connect, the main pump discharge pressure that obtains carrys out control valve core displacement；B interface connects load sensitive pump 6
Oil return inlet T, it is therefore an objective to absorption system excess traffic；The load-sensitive mouth of D interface external load sensitive pump 6, it is negative for obtaining
Sensitive pressure is carried, and is compared with A interface.Adjustable spring E is to set the pressure in protecting against shock valve between A interface and D interface
Difference, thus impact and the eradicating efficacy of control system.
The adjustable spring E and D interface of protecting against shock valve 8 are placed in the same end, and the setting pressure of adjustable spring is quick greater than loading
It is hydraulic caused by sense pump 6；If pressure difference between A interface and D interface is beyond setting, switching is opened by this valve, releases and is
Unite extra flow, inhibit main valve turn-off transient pumpage=lag keep flow system flow excessive and caused by hydraulic shock；If not
Exceed, this valve does not work.
When system worked well, by oil liquid feed system under the drive of motor 5, oil liquid passes through negative load sensitive pump 6
Carry flow Q needed for sensing multi-way valve 9 is supplied to load1, spool is located at left position, and protecting against shock valve 8 is in close state, such as Fig. 2 institute
Show.
When the main valve 9-3 in load sensing multi-way valve 9 is closed, i.e., will the flow that enter load rest on pump and main valve it
Between, system pressure increases, and is more than that protecting against shock valve 8 sets hydraulic with the difference of feedback pressure, and spool moves to right, 8 quilt of protecting against shock valve
It opens, as shown in figure 3, B interface is connected to C interface, (Q needed for a part of oil liquid supply load1-Q2), remaining oil liquid Q2Oil return
Case achievees the purpose that elimination system excess traffic reduces hydraulic shock.
Load-sensitive hydraulic system includes hydraulic oil container 1, liquidometer 2, air cleaner 3, return filter 4, motor
5, load sensitive pump 6, overflow valve 7, protecting against shock valve 8, load sensing multi-way valve 9, check valve 10, switching ball 11 and Manual pilot
Formula overflow valve 12, wherein load sensitive pump 6 obtains power by motor 5 and obtains hydraulic oil from fuel tank 1, by negative
The P mouth carried on the major loop of sensitive pump 6 is output to hydraulic working connection, by the pressure compensator 9-2 in load sensing multi-way valve 9
Main valve 9-3 is flowed to, supply load executes oil circuit after main valve 9-3 commutation.It is quick due to loading when the moment that main valve 9-3 is closed
Sense 6 discharge capacity control lags of pump increase in flow instantaneous in the closing velocity of main valve 9-3, system pipeline, cause big compression shock,
The pressure difference of 8 sensory perceptual system pressure and load-sensitive pressure of protecting against shock valve at this time, if reaching its setting value, protecting against shock valve 8 is opened, and is
System excess traffic is eliminated by protecting against shock valve 8, makes system be provided only to load required flow, compression shock is eliminated.Wherein, liquid level
Meter 2 filters out the air for including in oil liquid, 4 filterer of return filter for monitoring the oil liquid in fuel tank 1, air cleaner 3
Make the impurity in device, repairing function may be implemented in included check valve under special circumstances.Overflow valve 7 is for setting system
Maximum working pressure (MWP) can quantify regulating system pressure with its mating setting manual adjustment knob.Load sensing multi-way valve 9 is controllable
The direction of flow system flow load, wherein when forward direction load, oil liquid flows to A from P, flows to T oil return box by B after load.Reversely
When, oil liquid flows to B from P and enters load, flows to T oil return box by A after Opposite side loading, realizes the function of Opposite side loading.Load
Pressure compensator 9-2 in sensing multi-way valve 9 is in order to keep the pressure difference of main valve to stablize, to keep the flow for flowing to actuator
Stablize, the accurate movement velocity for controlling executive component.The negative-feedback pressure signal LS being fed in circuit is passed through shuttle valve by multi-way valve
9-1 is transmitted to load sensitive pump, and then automatically adjusts to flow rate of hydraulic system, and X controls oil sources mouth, and Y controls oily drain port, LS load
Sensitive mouth.Check valve 10 is set between multi-way valve and charge valve, for maintaining the stable state of loading section in work.System adds
It carries and load pressure size is adjusted by hand precursor overflow valve 12.
Example:
It will be in the test macro hydraulic shock characteristic under the 50ms shut-in time of the main valve under maximum opening, hydraulic system
System pressure is 15MPa, motor speed 2000r/min.By taking flow system flow is 30L/min and load pressure is 8MPa as an example,
Impact in Hydraulic System characteristic under same pressure flow under comparative analysis protecting against shock valve opening and closing state, Fig. 4 are examination
It tests as a result, as seen from the figure, when protecting against shock valve is closed, system pressure rises to 10.9MPa from 8MPa impact, and compression shock is
26.6%；When protecting against shock valve is opened, system pressure only has the fluctuation of very little in main valve turn-off transient, and maximum is only 8.2MPa,
Compression shock is only 2.5%.Show that protecting against shock valve can effectively eliminate system shock.
Obviously, it is practical without departing from this can to carry out various changes and deformation to the utility model by those skilled in the art
Novel spirit and scope.If in this way, the utility model these change and deformation belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model also includes these modifications and variations.
Claims (4)
1. a kind of device for eliminating load sensitive system hydraulic shock, it is characterised in that: including being arranged in load-sensitive hydraulic pressure system
The protecting against shock valve (8) united on major loop, the hydraulic of the protecting against shock valve (8) are greater than the hydraulic of major loop；
The protecting against shock valve (8) connect with the load sensitive pump (6) on load-sensitive hydraulic system, and the protecting against shock valve (8)
It is hydraulic be greater than load sensitive pump (6) caused by it is hydraulic；
The protecting against shock valve (8) includes four A interface, B interface, C interface and D interface external tappings, wherein A interface and C interface are equal
Connect the oil outlet of load sensitive pump (6)；B interface connects the oil return inlet T of load sensitive pump (6)；D interface external load sensitive pump
(6) load-sensitive mouth.
2. a kind of device for eliminating load sensitive system hydraulic shock according to claim 1, it is characterised in that: described anti-
Dash valve (8) further includes for adjusting the hydraulic adjustable spring of protecting against shock valve (8), and the adjustable spring and D interface are placed in same
End.
3. a kind of device for eliminating load sensitive system hydraulic shock according to claim 1 or 2, it is characterised in that: anti-
Dash valve (8) using closed type pilot control valve.
4. a kind of device for eliminating load sensitive system hydraulic shock according to claim 3, it is characterised in that: described anti-
Dash valve (8) is using floating type screw-in cartridge valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721574324.1U CN208565105U (en) | 2017-11-22 | 2017-11-22 | A kind of device for eliminating load sensitive system hydraulic shock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721574324.1U CN208565105U (en) | 2017-11-22 | 2017-11-22 | A kind of device for eliminating load sensitive system hydraulic shock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208565105U true CN208565105U (en) | 2019-03-01 |
Family
ID=65445717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721574324.1U Expired - Fee Related CN208565105U (en) | 2017-11-22 | 2017-11-22 | A kind of device for eliminating load sensitive system hydraulic shock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208565105U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020210441A1 (en) | 2020-08-17 | 2022-02-17 | Hawe Hydraulik Se | Proportional spool valve with a pressure relief valve, pressure relief valve and hydraulic system |
-
2017
- 2017-11-22 CN CN201721574324.1U patent/CN208565105U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020210441A1 (en) | 2020-08-17 | 2022-02-17 | Hawe Hydraulik Se | Proportional spool valve with a pressure relief valve, pressure relief valve and hydraulic system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190301 Termination date: 20191122 |