CN104030199A - 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
CN104030199A
CN104030199A CN201410224032.XA CN201410224032A CN104030199A CN 104030199 A CN104030199 A CN 104030199A CN 201410224032 A CN201410224032 A CN 201410224032A CN 104030199 A CN104030199 A CN 104030199A
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China
Prior art keywords
oil
directional control
multiple directional
control valve
throttling
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CN201410224032.XA
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Chinese (zh)
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CN104030199B (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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Publication of CN104030199B publication Critical patent/CN104030199B/en
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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, be specifically related to a kind of forklift hydraulic system.
Background technology
At present, what fork truck below domestic 25T great majority adopted is hydraulic system with constant displacement pump, and the flow of system is generally to determine according to the door frame required traffic requirement that rises.And do or accessory when action when door frame, due to the requirement of operating cylinder kinematic velocity, required flow is only 30%~50% of maximum flow, unnecessary flow overflows back in hydraulic reservoir by by pass valve high pressure, produce thus very large degradation of energy, cause system heating, affect the normal work of system.Fig. 2 is the hydraulic schematic diagram of common forklift door frame inclination or accessory oil circuit, and it is made up of operating cylinder 1, multi-way reversing valve block 2, and valve rod is in the time of meta, and P to T communicates, and commutation is to be obstructed.When valve rod commutation the position, driving engine full speed operation, due to the restriction requirement of operating cylinder kinematic velocity, oil pump delivery rate can all not enter operating cylinder by multi-way reversing valve block 2, the pressure of P mouth will increase, by pass valve 3 is opened, and unnecessary fluid overflows back in hydraulic reservoir by by pass valve 3 high pressure.So this circuit system loss in efficiency is large, easily heating.
Summary of the invention
In order to reduce loss in efficiency, the minimizing heating of system, the present invention, by structural development, provides a kind of forklift hydraulic system with other oil circuit throttling speed control circuit.
The forklift hydraulic system with other oil circuit throttling speed control circuit comprises operating cylinder and multi-way reversing valve block; Described multi-way reversing valve block comprises multiple directional control valve and by pass valve; Described multiple directional control valve is three six-way transfer valves, and its first oil inlet C, the second oil inlet D communicate by the oil inlet P of three-way pipeline and multi-way reversing valve block, and described the second oil-feed port D place is provided with inlet one-way valve; The import of described by pass valve is being communicated with the oil inlet P of multi-way reversing valve block, and the outlet of by pass valve 3 is being communicated with back oil road; The first return opening E of described multiple directional control valve is being communicated with back oil road, and the second return opening F is being communicated with back oil road, and the first actuator port G is being communicated with the first actuator port A of multi-way reversing valve block, and the second actuator port H is being communicated with the second actuator port B of multi-way reversing valve block; Described back oil road is being communicated with the oil return inlet T of multi-way reversing valve block; Between the first oil inlet C and the second return opening F, be provided with bleed off circuit, described bleed off circuit is throttling oil duct;
When multiple directional control valve is during in meta, the first oil inlet C and the second return opening F connect; In the time that multiple directional control valve commutates to right position, the second oil inlet D and the first actuator port G connect, and the second actuator port H and the first return opening E connect, and between the first oil inlet C and the second return opening F, communicate by throttling oil duct; In the time that multiple directional control valve commutates to left position, the second oil inlet D and the second actuator port H connect, and the first actuator port G and the first return opening E connect, and between the first oil inlet C and the second return opening F, communicate by throttling oil duct.
Described throttling oil duct is cutoff port or throttling channel.
Useful technique effect of the present invention embodies in the following areas:
1. the present invention's built in bypass throttling oil duct in multiway valve, regulates the flow that enters operating cylinder, has avoided the unnecessary flow of system to overflow back in hydraulic reservoir by by pass valve high pressure, and the heating of minimizing system is simple in structure, effective;
2. built in bypass throttling oil duct in multiway valve, regulates cylinder movement speed, compact conformation, and cost is low.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the hydraulic schematic diagram of common forklift door frame inclination or accessory oil circuit.
Sequence number in upper figure: operating cylinder 1, multi-way reversing valve block 2, by pass valve 3, multiple directional control valve 4, throttling oil duct 5, three-way pipeline 6, back oil road 7.
Detailed description of the invention
Below in conjunction with accompanying drawing, 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 comprises operating cylinder 1 and multi-way reversing valve block 2.Multi-way reversing valve block 2 comprises multiple directional control valve 4 and by pass valve 3.Multiple directional control valve 4 is three six-way transfer valves, and its first oil inlet C, the second oil inlet D communicate by the oil inlet P of three-way pipeline and multi-way reversing valve block 2, and described the second oil-feed port D place is provided with inlet one-way valve; The import of by pass valve 3 is being communicated with the oil inlet P of multi-way reversing valve block 2, and the outlet of by pass valve 3 is being communicated with back oil road 7; The first return opening E of multiple directional control valve 4 is being communicated with back oil road 7, the second return opening F and is being communicated with the first actuator port A that back oil road 7, the first actuator port G are being communicated with multi-way reversing valve block, and the second actuator port H is being communicated with the second actuator port B of multi-way reversing valve block 2; Back oil road 7 is being communicated with the oil return inlet T of multi-way reversing valve block 2; Improvement is: between the first oil inlet C and the second return opening F, be provided with bleed off circuit, described bleed off circuit is throttling oil duct 5, and throttling oil duct 5 is cutoff port (or throttling channel).
When multiple directional control valve 4 is during in meta, the first oil inlet C and the second return opening F connect; In the time that multiple directional control valve 4 commutates to right position, the second oil inlet D and the first actuator port G connect, and the second actuator port H and the first return opening E connect, and between the first oil inlet C and the second return opening F, communicate by throttling oil duct 5; In the time that multiple directional control valve 4 commutates to left position, the second oil inlet D and the second actuator port H connect, and the first actuator port G and the first return opening E connect, and between the first oil inlet C and the second return opening F, communicate by throttling oil duct 5.
Principle of work of the present invention: when multiple directional control valve 4 is during in meta, hydraulic oil passes through the oil inlet P of multi-way reversing valve block 2 through the first oil inlet C, the second return opening F of multiple directional control valve 4, back oil road 7 returns hydraulic reservoir with oil return inlet T, and operating cylinder 1 is failure to actuate.
In the time that operating cylinder 1 moves right, operation multiple directional control valve 4 is to right position, part pressure oil is transported to the rodless cavity of operating cylinder 1 through the first actuator port A of multi-way reversing valve block 2 through the second oil inlet D, the first actuator port G of multiple directional control valve 4 by the oil inlet P of multi-way reversing valve block 2, promote oil cylinder and move to right; Unnecessary pressure oil is by throttling oil duct 5 by-pass oil sump tanks between the first oil inlet C and the second return opening F, the large I of hole in throttling oil duct 5 or groove is set according to the traffic requirement of operating cylinder, as long as regulate by the flow of by-pass throttle oil duct 5, just can regulate the flow that enters operating cylinder 1, thereby just regulate the kinematic velocity of operating cylinder 1.When multiple directional control valve 4 commutation is to left position, operating cylinder 1 is during to left movement, and principle of work communicates.The by pass valve 3 is here used as safety valve, and while normally work, by pass valve 3 is in closed condition.

Claims (2)

1. there is the forklift hydraulic system of other oil circuit throttling speed control circuit, comprise operating cylinder and multi-way reversing valve block; Described multi-way reversing valve block comprises multiple directional control valve and by pass valve; Described multiple directional control valve is three six-way transfer valves, and its first oil inlet C, the second oil inlet D communicate by the oil inlet P of three-way pipeline and multi-way reversing valve block, and described the second oil-feed port D place is provided with inlet one-way valve; The import of described by pass valve is being communicated with the oil inlet P of multi-way reversing valve block, and the outlet of by pass valve 3 is being communicated with back oil road; The first return opening E of described multiple directional control valve is being communicated with back oil road, and the second return opening F is being communicated with back oil road, and the first actuator port G is being communicated with the first actuator port A of multi-way reversing valve block, and the second actuator port H is being communicated with the second actuator port B of multi-way reversing valve block; Described back oil road is being communicated with the oil return inlet T of multi-way reversing valve block; It is characterized in that: between the first oil inlet C and the second return opening F, be provided with bleed off circuit, described bleed off circuit is throttling oil duct; When multiple directional control valve is during in meta, the first oil inlet C and the second return opening F connect; In the time that multiple directional control valve commutates to right position, the second oil inlet D and the first actuator port G connect, and the second actuator port H and the first return opening E connect, and between the first oil inlet C and the second return opening F, communicate by throttling oil duct; In the time that multiple directional control valve commutates to left position, the second oil inlet D and the second actuator port H connect, and the first actuator port G and the first return opening E connect, and between the first oil inlet C and the second return opening F, communicate by throttling oil duct.
2. the forklift hydraulic system with other oil circuit throttling speed control circuit according to claim 1, is characterized in that: described throttling oil duct is cutoff port 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)

Priority Applications (1)

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CN201410224032.XA CN104030199B (en) 2014-05-26 2014-05-26 Forklift hydraulic system with bypass oil way throttling speed regulation loop

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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

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CN104030199B CN104030199B (en) 2017-02-15

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Cited By (2)

* Cited by examiner, † Cited by third party
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
CN110397646A (en) * 2019-06-27 2019-11-01 中煤科工集团西安研究院有限公司 A kind of cylinder control system and control method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080994A (en) * 1976-01-16 1978-03-28 Robert Bosch Gmbh Control arrangement for supplying pressure fluid to at least two hydraulically operated consumer devices
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
CN102701119A (en) * 2012-06-25 2012-10-03 安徽合力股份有限公司 Forward-shift impact preventing hydraulic system for forward-shift type fork truck mast
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080994A (en) * 1976-01-16 1978-03-28 Robert Bosch Gmbh Control arrangement for supplying pressure fluid to at least two hydraulically operated consumer devices
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
CN102701119A (en) * 2012-06-25 2012-10-03 安徽合力股份有限公司 Forward-shift impact preventing hydraulic system for forward-shift type fork truck mast
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

Cited By (2)

* Cited by examiner, † Cited by third party
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
CN110397646A (en) * 2019-06-27 2019-11-01 中煤科工集团西安研究院有限公司 A kind of cylinder control system and control method

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