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 PDF

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Publication number
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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China
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oil
directional control
control valve
connects
return opening
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CN104030199A (en
Inventor
温跃清
陈捷
余建福
袁正
李戈操
陈秀云
徐家祥
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Anhui Heli Co Ltd
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Anhui Heli Co Ltd
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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

There is the forklift hydraulic system of other oil circuit throttling speed control circuit
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.
CN201410224032.XA 2014-05-26 2014-05-26 Forklift hydraulic system with bypass oil way throttling speed regulation loop Active CN104030199B (en)

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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
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)

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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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Publication number Priority date Publication date Assignee Title
DE2601484C2 (en) * 1976-01-16 1984-07-26 Robert Bosch Gmbh, 7000 Stuttgart, De
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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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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