CN104030199B - Forklift hydraulic system with bypass oil way throttling speed regulation loop - Google Patents
Forklift hydraulic system with bypass oil way throttling speed regulation loop Download PDFInfo
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- CN104030199B CN104030199B CN201410224032.XA CN201410224032A CN104030199B CN 104030199 B CN104030199 B CN 104030199B CN 201410224032 A CN201410224032 A CN 201410224032A CN 104030199 B CN104030199 B CN 104030199B
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Abstract
The invention relates to a forklift hydraulic system with a bypass oil way throttling speed regulation loop. The forklift hydraulic system comprises a working oil cylinder and a multiple directional control valve plate. The multiple directional control valve plate comprises a multiple directional control valve and an overflow valve. When the multiple directional control valve is located at the reversing position, the bypass oil way is arranged between a first oil inlet C and a second oil returning opening F of the multiple directional control valve and is a throttling oil way. According to the forklift hydraulic system, the bypass throttling oil way is arranged in the multiple directional control valve, the flow of oil entering the working oil cylinder is adjusted, redundant oil of the system is prevented from being overflowed back to a hydraulic oil tank in a high-pressure mode through the overflowing valve, generated heat of the system is reduced, and the forklift hydraulic system is simple in structure and good in effect; the bypass throttling oil way is arranged in the multiple directional control valve, the movement speed of the oil cylinder is adjusted, the structure is compact, and cost is low.
Description
Technical field
The invention belongs to fork truck technical field is and in particular to a kind of forklift hydraulic system.
Background technology
At present, the fork truck great majority of domestic below 25T use hydraulic system with constant displacement pump, and the flow of system is usually root
Rise what required traffic requirement to determine according to door frame.And when door frame does or during accessory action, due to operating cylinder motion
The requirement of speed, necessary flow is only the 30%～50% of maximum stream flow, and unnecessary flow returns hydraulic pressure by overflow valve high pressure kicks
In fuel tank, thereby produce very big energy loss, cause system heat generation, the normal work of impact system.Fig. 2 is common fork truck
Door frame inclination or the hydraulic schematic diagram of accessory oil circuit, it is made up of operating cylinder 1, multi-way reversing valve block 2, and valve rod is in middle position
When, P to T communicates, and commutates as being obstructed.During valve rod commutation position, engine full speed operation, due to operating cylinder motion
The restriction of speed requires, and oil pump output flow all will not enter operating cylinder by multi-way reversing valve block 2, and the pressure of P mouth is just
Can increase, overflow valve 3 is opened, unnecessary fluid is returned in hydraulic oil container by overflow valve 3 high pressure kicks.So this circuit system
Power loss is big, easily generates heat.
Content of the invention
In order to reduce the power loss of system, reduce heating, the present invention is improved by structure, provides one kind to have other oil circuit
The forklift hydraulic system of throttling speed control circuit.
The forklift hydraulic system with other oil circuit throttling speed control circuit includes operating cylinder and multi-way reversing valve block；Described many
Way reversing valve piece includes multiple directional control valve and overflow valve；Described multiple directional control valve is three six-way transfer valves, its first oil-in
C, the second oil-in D are communicated by the oil inlet P of three-way pipeline and multi-way reversing valve block, be provided with described second oil-feed port D into
Mouth check valve；The inlet communication of described overflow valve the oil inlet P of multi-way reversing valve block, and the outlet of overflow valve 3 oil return
Road；First oil return opening E of described multiple directional control valve connects back oil road, and the second oil return opening F connects back oil road, the first working oil
Mouth G connects the first actuator port A of multi-way reversing valve block, and the second actuator port H connects the second work of multi-way reversing valve block
Make hydraulic fluid port B；Described back oil road connects the oil return inlet T of multi-way reversing valve block；Set between first oil-in C and the second oil return opening F
There is bleed off circuit, described bleed off circuit is throttling oil duct；
When multiple directional control valve is in middle position, the first oil-in C and the second oil return opening F connects；When multiple directional control valve commutation
During to right position, the second oil-in D and the first actuator port G connects, and the second actuator port H and the first oil return opening E connects, and first
Communicated by the oil duct that throttles between oil-in C and the second oil return opening F；When multiple directional control valve commutates to left position, the second oil-in D
Connect with the second actuator port H, the first actuator port G and the first oil return opening E connect, the first oil-in C and the second oil return opening F it
Between by throttle oil duct communicate.
Described throttling oil duct is throttle orifice or throttling channel.
The Advantageous Effects of the present invention embody in the following areas：
1. present invention built in bypass throttling oil duct in banked direction control valves, adjusts the flow entering operating cylinder, it is to avoid system
Unnecessary flow is returned in hydraulic oil container by overflow valve high pressure kicks, reduces system heat generation, and structure is simple, and effect is good；
2. built in bypass throttling oil duct in banked direction control valves, adjusts cylinder movement speed, compact conformation, low cost.
Brief description
Fig. 1 is present configuration schematic diagram.
Fig. 2 is the hydraulic schematic diagram of common forklift door frame inclination or accessory oil circuit.
Upper in figure sequence number：Operating cylinder 1, multi-way reversing valve block 2, overflow valve 3, multiple directional control valve 4, throttling oil duct 5, threeway
Pipeline 6, back oil road 7.
Specific embodiment
Below in conjunction with the accompanying drawings, by embodiment, the present invention is further described.
Referring to Fig. 1 and Fig. 2, the forklift hydraulic system with other oil circuit throttling speed control circuit includes operating cylinder 1 and multichannel
Reversing valve plate 2.Multi-way reversing valve block 2 includes multiple directional control valve 4 and overflow valve 3.Multiple directional control valve 4 is three six-way transfer valves,
Its first oil-in C, the second oil-in D are communicated by the oil inlet P of three-way pipeline and multi-way reversing valve block 2, described second confession
It is provided with inlet one-way valve at hydraulic fluid port D；The inlet communication of overflow valve 3 oil inlet P of multi-way reversing valve block 2, the outlet of overflow valve 3
Connect back oil road 7；First oil return opening E of multiple directional control valve 4 connects back oil road 7, and the second oil return opening F connects back oil road 7,
First actuator port G connects the first actuator port A of multi-way reversing valve block, and the second actuator port H connects multiple directional control valve
Second actuator port B of piece 2；Back oil road 7 connects the oil return inlet T of multi-way reversing valve block 2；It is improved by：First oil-in C and
It is provided with bleed off circuit, described bleed off circuit is the oil duct 5 that throttles, throttling oil duct 5 is throttle orifice between second oil return opening F（Or section
Chute）.
When multiple directional control valve 4 is in middle position, the first oil-in C and the second oil return opening F connects；When multiple directional control valve 4 changes
To during to right position, the second oil-in D and the first actuator port G connects, and the second actuator port H and the first oil return opening E connects, the
Pass through throttling oil duct 5 between one oil-in C and the second oil return opening F to communicate；When multiple directional control valve 4 commutates to left position, second enters
Hydraulic fluid port D and the second actuator port H connects, the first actuator port G and the first oil return opening E connection, the first oil-in C and the second oil return
Communicated by the oil duct 5 that throttles between mouth F.
The present invention operation principle：When multiple directional control valve 4 is in middle position, hydraulic oil passes through multi-way reversing valve block 2
First oil-in C, the second oil return opening F through multiple directional control valve 4 for the oil inlet P, back oil road 7 and oil return inlet T return hydraulic oil container, work
Oil cylinder 1 is failure to actuate.
When operating cylinder 1 moves right, operation multiple directional control valve 4 to right position, a part of pressure oil passes through multi-way reversing
The second oil-in D through multiple directional control valve 4 for the oil inlet P of valve block 2, the first work through multi-way reversing valve block 2 for the first actuator port G
Make the rodless cavity that hydraulic fluid port A is transported to operating cylinder 1, promote oil cylinder to move to right；Unnecessary pressure oil passes through the first oil-in C and second
Throttling oil duct 5 by-pass oil return box between oil return opening F, the hole in throttling oil duct 5 or the big I of groove are according to the flow of operating cylinder
Requiring to set, as long as adjusting the flow by by-pass throttle oil duct 5, just can adjust the flow entering operating cylinder 1, thus just
Have adjusted the movement velocity of operating cylinder 1.When multiple directional control valve 4 commutates to left position, when operating cylinder 1 is to left movement, work is former
Reason communicates.Here safety valve is used as by overflow valve 3, and during normal work, overflow valve 3 is closed.
Claims (2)
1. there is the forklift hydraulic system of other oil circuit throttling speed control circuit, including operating cylinder and multi-way reversing valve block；Described many
Way reversing valve piece includes multiple directional control valve and overflow valve；Described multiple directional control valve is three six-way transfer valves, its first oil-in
C, the second oil-in D are communicated by the oil inlet P of three-way pipeline and multi-way reversing valve block, be provided with described second oil-in D into
Mouth check valve；The inlet communication of described overflow valve the oil inlet P of multi-way reversing valve block, and the outlet of overflow valve (3) back
Oil duct；First oil return opening E of described multiple directional control valve connects back oil road, and the second oil return opening F connects back oil road, the first work
Hydraulic fluid port G connects the first actuator port A of multi-way reversing valve block, and the second actuator port H connects the second of multi-way reversing valve block
Actuator port B；Described back oil road connects the oil return inlet T of multi-way reversing valve block；It is characterized in that：First oil-in C and second
It is provided with bleed off circuit, described bleed off circuit is throttling oil duct between oil return opening F；When multiple directional control valve is in middle position, first enters
Hydraulic fluid port C and the second oil return opening F connects；When multiple directional control valve commutates to right position, the second oil-in D is connect with the first actuator port G
Logical, the second actuator port H and the first oil return opening E connects, and passes through the oil duct phase that throttles between the first oil-in C and the second oil return opening F
Logical；When multiple directional control valve commutates to left position, the second oil-in D and the second actuator port H connect, the first actuator port G and the
One oil return opening E connects, and is communicated by the oil duct that throttles between the first oil-in C and the second oil return opening F.
2. the forklift hydraulic system with other oil circuit throttling speed control circuit according to claim 1 it is characterised in that：Described
Throttling oil duct is throttle orifice or throttling channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410224032.XA CN104030199B (en) | 2014-05-26 | 2014-05-26 | Forklift hydraulic system with bypass oil way throttling speed regulation loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410224032.XA CN104030199B (en) | 2014-05-26 | 2014-05-26 | Forklift hydraulic system with bypass oil way throttling speed regulation loop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104030199A CN104030199A (en) | 2014-09-10 |
| CN104030199B true CN104030199B (en) | 2017-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410224032.XA Active CN104030199B (en) | 2014-05-26 | 2014-05-26 | Forklift hydraulic system with bypass oil way throttling speed regulation loop |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105692509A (en) * | 2015-11-10 | 2016-06-22 | 林德（中国）叉车有限公司 | Forklift hydraulic system with dynamic throttling speed governing circuit |
| CN108502816B (en) * | 2018-05-08 | 2023-07-14 | 安徽合力股份有限公司 | Bypass type energy regeneration forklift hydraulic system |
| CN110397646B (en) * | 2019-06-27 | 2020-06-30 | 中煤科工集团西安研究院有限公司 | Oil cylinder control system and control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203938442U (en) * | 2014-05-26 | 2014-11-12 | 安徽合力股份有限公司 | There is the forklift hydraulic system of other oil circuit throttling speed control circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2601484C2 (en) * | 1976-01-16 | 1984-07-26 | Robert Bosch Gmbh, 7000 Stuttgart | Control device for at least two hydraulic consumers fed by a pressure medium source |
| JPH10231095A (en) * | 1997-02-21 | 1998-09-02 | Toyota Autom Loom Works Ltd | Hydraulic device for vehicle for high lift work |
| CN2802149Y (en) * | 2005-04-30 | 2006-08-02 | 浙江佳力科技股份有限公司 | Forklift multiple directional control valve |
| CN102628465A (en) * | 2012-04-17 | 2012-08-08 | 安徽合力股份有限公司 | Energy recovery type lifting hydraulic system for hoisting and conveying machine |
| CN102701119B (en) * | 2012-06-25 | 2014-04-16 | 安徽合力股份有限公司 | Forward-shift impact preventing hydraulic system for forward-shift type fork truck mast |
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2014
- 2014-05-26 CN CN201410224032.XA patent/CN104030199B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203938442U (en) * | 2014-05-26 | 2014-11-12 | 安徽合力股份有限公司 | There is the forklift hydraulic system of other oil circuit throttling speed control circuit |
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| CN104030199A (en) | 2014-09-10 |
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