CN105329817A - Single-pump hydraulic system used for forklift - Google Patents
Single-pump hydraulic system used for forklift Download PDFInfo
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- CN105329817A CN105329817A CN201510877796.3A CN201510877796A CN105329817A CN 105329817 A CN105329817 A CN 105329817A CN 201510877796 A CN201510877796 A CN 201510877796A CN 105329817 A CN105329817 A CN 105329817A
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- 239000007788 liquid Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 abstract 5
- 239000010720 hydraulic oil Substances 0.000 abstract 3
- 238000000034 method Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 7
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 210000002445 nipple Anatomy 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a single-pump hydraulic system used for a forklift. The single-pump hydraulic system comprises a hoist cylinder, an oblique cylinder, a steering cylinder and a gear pump which is used for supplying high-pressure oil fluid to the hoist cylinder, the oblique cylinder and the steering cylinder; the single-pump hydraulic system further comprises a hydraulic oil tank, a multi-way reversing valve and a full-hydraulic steering gear; the oil inlet end of the gear pump is connected with the oil outlet end of the hydraulic oil tank; the oil outlet end of the gear pump is connected with the multi-way reversing valve; the multi-way reversing valve is connected with the oil return end of the hydraulic oil tank; the hoist cylinder, the oblique cylinder and the steering cylinder are all connected with the multi-way reversing valve; and the full-hydraulic steering gear is connected between the multi-way steering valve and the steering cylinder. According to the single-pump hydraulic system used for the forklift disclosed by the invention, the production and manufacture cost is lowered; the operation is more convenient and comfortable; and the production efficiency is improved.
Description
Technical field
The present invention relates to the single pump hydraulic system of a kind of fork truck, relate to the equipment of a kind of integrated morphology pattern be applied in forklift hydraulic system particularly, belong to fork truck manufacturing technology field.
Background technology
Hydraulic pressure drive control system is a kind of alerting ability and convenience mode often used in fork truck process industry, adopts hydraulic pressure to complete the process of transferring energy.It for energy medium, realizes the automatic control of various machinery with pressure flow body.Hydrostatic drive utilizes element to form required various control loops, then the driving system having been become certain controlling functions by some loops organic assembling is to complete the transmission of energy, conversion and control.
At present, in medium tonnage fork car installation process, the hydraulic efficiency pressure system mode that usual use is traditional, it has following characteristics: this traditional model forklift hydraulic system is " hydraulic power shunting transmission ", by the driving system of two hydraulic efficiency pump units " parallel connection " difference through-put power stream, namely utilize the power driving engine exports to be divided into two strands " hydraulic power streams ", by the controllability of hydraulic power stream, make these two strands of poower flow control respectively to turn to and hoist to tilt to wait device.Two aspects combine by this mode, and under rated load, the efficiency of system is lower, and degree of automation is disperseed, and speed adjustable range is not too accurate, and commutation positioning precision is coarse, adds engine consumption, its economy is deteriorated.
Summary of the invention
The present invention for the deficiency that prior art exists, provides a kind of fork truck single pump hydraulic system, meets actual operation requirements just.
For solving the problem, the technical solution used in the present invention is as follows:
The single pump hydraulic system of a kind of fork truck, comprises hoist cylinder, dump ram and steering cylinder, and provides the gear type pump of high-voltage oil liquid for described hoist cylinder, described dump ram and described steering cylinder;
Also comprise hydraulic reservoir, multiple directional control valve and all-hydraulic steering gear, the oil inlet end of described gear type pump connects the oil outlet end of described hydraulic reservoir, the oil outlet end of described gear type pump connects described multiple directional control valve, and described multiple directional control valve is connected with the oil revolving end of described hydraulic reservoir, described hoist cylinder, described dump ram are all connected with described multiple directional control valve with described steering cylinder, and are also connected with described all-hydraulic steering gear between described multiple directional control valve and described steering cylinder.
As the improvement of technique scheme, the second direction control cock that described multiple directional control valve comprises threeway flow-limiting valve, controls the first direction control cock of described hoist cylinder, controls described dump ram, described all-hydraulic steering gear comprises input oil inlet end, input oil revolving end;
Described threeway flow-limiting valve comprises an input end and two mouths: the input end of described threeway flow-limiting valve is connected described gear delivery side of pump; Be parallel-connected on the oil revolving end of described hydraulic reservoir with the input oil revolving end of described all-hydraulic steering gear after the mouth one of described threeway flow-limiting valve connects described first direction control cock and described second direction control cock successively; The mouth two of described threeway flow-limiting valve connects the input oil inlet end of described all-hydraulic steering gear;
Described hoist cylinder is connected with described first direction control cock, and described dump ram is connected with described second direction control cock.
As the improvement of technique scheme, the mouth one of described threeway flow-limiting valve also connects the oil revolving end of described hydraulic reservoir by the first by pass valve, and described first direction control cock and described second direction control cock are in parallel with described first by pass valve after connecting, described first by pass valve is also in parallel with described all-hydraulic steering gear.
As the improvement of technique scheme, the mouth two of described threeway flow-limiting valve also connects the oil revolving end of described hydraulic reservoir by the second by pass valve, and described second by pass valve is in parallel with described all-hydraulic steering gear.
As the improvement of technique scheme, be provided with single-way flow restricting valve between described hoist cylinder and described first direction control cock, and be also provided with shutoff valve between described single-way flow restricting valve and described hoist cylinder.
As the improvement of technique scheme, the mouth one of described threeway flow-limiting valve is also by the first check valve in parallel and the second check valve described first direction control cock and described second direction control cock respectively.
As the improvement of technique scheme, described all-hydraulic steering gear comprises third direction control cock, is arranged on the 3rd by pass valve between the input oil inlet end of described all-hydraulic steering gear and input oil revolving end and in parallel with described third direction control cock;
Also comprise the 4th by pass valve, the 5th by pass valve, the 3rd check valve and the 4th check valve that are arranged between described third direction control cock and described steering cylinder.
As the improvement of technique scheme, described third direction control cock is provided with two-way quantitative pump.
Compared with prior art, implementation result of the present invention is as follows in the present invention:
The single pump hydraulic system of a kind of fork truck of the present invention has the following advantages:
1, can realize carrying out controlling fast and accurately to multiple power elements of different loads pressure, each power element is non-interference simultaneously;
2, good operation performance, perform starting point and work speed or flow is only relevant with the angle of bar handle and the opening degree of valve, have nothing to do with load pressure, no matter how load pressure changes, actuating unit presses the predetermined path of motion work of operating personal all the time, is convenient to the remote control of truck hydraulic;
3, superior microcontroller performance, is convenient to fine manipulation and multi-function operation;
4, arbitrary power element all can arrange the full flow of pump or the flow of needs;
5, multi-execution component extendability, increases available power element easily through additional valve;
6, there is the preferential and rotary torque controlling functions of revolution;
7, adopt single-pump system, whole system element is compact, and integration degree is high, and system adapter is few, installs and uses cost low, failure rate is low, is conducive to the densification of fork truck.
By using the situation of feedback, use the single pump hydraulic system of a kind of fork truck of the present invention to compare tradition, manufacturing cost reduces, and operates more light comfortable, improves production efficiency.
Accompanying drawing explanation
Fig. 1 is the single pump hydraulic system structural representation of a kind of fork truck of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiments content of the present invention is described.
As shown in Figure 1, be the single pump hydraulic system structural representation of a kind of fork truck that the present embodiment provides.
The present embodiment provides a kind of fork truck single pump hydraulic system, comprises hoist cylinder 1, dump ram 2 and steering cylinder 3, and provides the gear type pump 4 of high-voltage oil liquid for hoist cylinder 1, dump ram 2 and steering cylinder 3; Also comprise hydraulic reservoir 5, multiple directional control valve 6 and all-hydraulic steering gear 7, the oil inlet end of gear type pump 4 connects the oil outlet end of hydraulic reservoir 5, the oil outlet end of gear type pump 4 connects multiple directional control valve 6, and multiple directional control valve 6 is connected with the oil revolving end of hydraulic reservoir 5, hoist cylinder 1, dump ram 2 are all connected with multiple directional control valve 6 with steering cylinder 3, and are also connected with all-hydraulic steering gear 7 between multiple directional control valve 6 and steering cylinder 3.
The second direction control cock 63 that multiple directional control valve 6 comprises threeway flow-limiting valve 61, controls the first direction control cock 62 of described hoist cylinder 1, controls described dump ram 2, all-hydraulic steering gear 7 comprises input oil inlet end 71, input oil revolving end 72; Threeway flow-limiting valve 61 comprises an input end and two mouths: the input end of threeway flow-limiting valve 61 is connected the mouth of gear type pump 4; The mouth one of threeway flow-limiting valve 61 connects first direction control cock 62 successively and second direction control cock 63 input oil revolving end 72 that is rear and all-hydraulic steering gear 7 is parallel-connected on the oil revolving end of hydraulic reservoir 5; The mouth two of threeway flow-limiting valve 61 connects the input oil inlet end 71 of all-hydraulic steering gear 7; Hoist cylinder 1 is connected with first direction control cock 62, and dump ram 2 is connected with second direction control cock 63.
Further, the mouth one of threeway flow-limiting valve 61 also connects the oil revolving end of hydraulic reservoir 5 by the first by pass valve 64, and first direction control cock 62 and second direction control cock 63 are in parallel with the first by pass valve 64 after connecting, the first by pass valve 64 is also in parallel with all-hydraulic steering gear 7.The mouth two of threeway flow-limiting valve 61 also connects the oil revolving end of hydraulic reservoir 5 by the second by pass valve 65, and the second by pass valve 65 is in parallel with all-hydraulic steering gear 7.Be provided with single-way flow restricting valve 11 between hoist cylinder 1 and first direction control cock 62, and be also provided with shutoff valve 12 between single-way flow restricting valve 11 and hoist cylinder 1.The mouth one of threeway flow-limiting valve 61 is also by the first check valve 66 in parallel and the second check valve 67 first direction control cock 62 and second direction control cock 63 respectively.
All-hydraulic steering gear 7 comprises third direction control cock 73, is arranged on the 3rd by pass valve 74 between the input oil inlet end 71 of all-hydraulic steering gear 7 and input oil revolving end 72 and in parallel with third direction control cock 73; Also comprise the 4th by pass valve 75, the 5th by pass valve 76, the 3rd check valve 77 and the 4th check valve 78 that are arranged between third direction control cock 73 and steering cylinder 3.Particularly, third direction control cock 73 is provided with two-way quantitative pump 731.
The single pump hydraulic system of a kind of fork truck that the present embodiment provides, by driven by engine gear type pump 4 inhalant liquid force feed from hydraulic reservoir 5, discharge high pressure oil, be input in multiple directional control valve 6 through high-pressure rubber pipe, be assigned to each actuating unit by multiple directional control valve 6 again, that is: dump ram 2, through single-way flow restricting valve 11 to hoist cylinder 1, through all-hydraulic steering gear 7 to steering cylinder 3; Multiple directional control valve 6 oil return general export communicates with hydraulic reservoir 5, thus low pressure oil flows back to.Point return opening that wherein return opening of all-hydraulic steering gear 7 is integrated with multiple directional control valve 6 is connected by low pressure line, therefore oil circuit is rationally distributed, improves efficiency, decreases loss.
During installation, gear type pump 4 oil suction through oil suction pipe, straight coupling from hydraulic reservoir 5 inhalant liquid force feed, exporting the high pressure liquid force feed nipple bent piece that communicates of way reversing valve 6 at the most through oil outlet oil pump joint, high-pressure rubber pipe, multiple directional control valve 6 operating system branch one connects through free flow coupling and the single-way flow restricting valve 11 regulating hoist cylinder 1 speed; Branch two controls through free flow coupling, the dump ram 2 that dump ram steel pipe assembly is connected to high-pressure rubber pipe; Branch three controls to be connected with all-hydraulic steering gear 7 through delivery port high-pressure rubber pipe, nipple bent piece, the straight coupling communicated with steering cylinder 3 by nipple bent piece, high-pressure rubber pipe is again connected, and all-hydraulic steering gear 7 low pressure oil delivery port is connected through nipple bent piece, low pressure hose and multiple directional control valve 6 points of return openings.Above-mentioned three oil circuits flow back to hydraulic reservoir 5 through multiple directional control valve 6 oil return general export.
Multiple directional control valve 6 is the fluid control valve groups combined by multiple check valve, by pass valve and directional control valve.This valve arrangement is simple, and amount of leakage is little, and safety valve open and shut characteristic is good, and the sliding function of valve has various ways, and determine reset mode reliably, valve rod good rigidity, the accuracy of form and position is high, and tolerance clearance reduces, and stem diameter reduces simultaneously, can reduce the internal leakage of valve.
All-hydraulic steering gear 7 can reduce main frame cost, and provide reliably light structure, manoeuvrable is light, safe and reliable, very little moment can carry out continuous stepless and controls to rotate, be supplied to control loop and mechanical dimensions selects face widely.
Oil circuit form is simply connected oil circuit, and pipeline mechanism space is arranged and become simple, decreases and connects by pipeline the leakage and pipe vibration that cause.
The single pump hydraulic system of a kind of fork truck that the present embodiment provides, makes multiple directional control valve in structure design, shop characteristic etc., meet high-pressure high-flow requirement; Its load feedback is highly sensitive, can realize the characteristic that high precision controls, have good anti-interference resistance; Valve body reasonable Arrangement is made by optimal design; The transmission of failure-free pressure sensitive, pressure compensation mechanism can adapt to the various particular/special requirement such as rapid operation and order confluence structure and steering unit reaches the requirement that novel all-hydraulic hydraulic proportional controls, there is good fretting performance and energy-efficient feature, wherein almost without loss of pressure, whole system is made to be in low pressure armed state, and when commutation work, the flow that oil sources provides is flow needed for actuating unit, and through the examination of main frame operating mode, its waste of power can reduce.
Above content is detailed description made for the present invention in conjunction with specific embodiments, can not assert that the present invention specifically implements to be only limitted to these explanations.For those skilled in the art, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to the scope of protection of the invention.
Claims (8)
1. the single pump hydraulic system of fork truck, comprise hoist cylinder (1), dump ram (2) and steering cylinder (3), and be the gear type pump (4) that described hoist cylinder (1), described dump ram (2) and described steering cylinder (3) provide high-voltage oil liquid;
It is characterized in that, also comprise hydraulic reservoir (5), multiple directional control valve (6) and all-hydraulic steering gear (7), the oil inlet end of described gear type pump (4) connects the oil outlet end of described hydraulic reservoir (5), the oil outlet end of described gear type pump (4) connects described multiple directional control valve (6), and described multiple directional control valve (6) is connected with the oil revolving end of described hydraulic reservoir (5), described hoist cylinder (1), described dump ram (2) is all connected with described multiple directional control valve (6) with described steering cylinder (3), and be also connected with described all-hydraulic steering gear (7) between described multiple directional control valve (6) and described steering cylinder (3).
2. the single pump hydraulic system of a kind of fork truck as claimed in claim 1, it is characterized in that, the second direction control cock (63) that described multiple directional control valve (6) comprises threeway flow-limiting valve (61), controls the first direction control cock (62) of described hoist cylinder (1), controls described dump ram (2), described all-hydraulic steering gear (7) comprises input oil inlet end (71), input oil revolving end (72);
Described threeway flow-limiting valve (61) comprises an input end and two mouths: the input end of described threeway flow-limiting valve (61) is connected the mouth of described gear type pump (4); The mouth one of described threeway flow-limiting valve (61) connects described first direction control cock (62) successively and described second direction control cock (63) is parallel-connected on the oil revolving end of described hydraulic reservoir (5) with the input oil revolving end (72) of described all-hydraulic steering gear (7) afterwards; The mouth two of described threeway flow-limiting valve (61) connects the input oil inlet end (71) of described all-hydraulic steering gear (7);
Described hoist cylinder (1) is connected with described first direction control cock (62), and described dump ram (2) is connected with described second direction control cock (63).
3. the single pump hydraulic system of a kind of fork truck as claimed in claim 2, it is characterized in that, the mouth one of described threeway flow-limiting valve (61) also connects the oil revolving end of described hydraulic reservoir (5) by the first by pass valve (64), and described first direction control cock (62) and described second direction control cock (63) are in parallel with described first by pass valve (64) after connecting, described first by pass valve (64) is also in parallel with described all-hydraulic steering gear (7).
4. the single pump hydraulic system of a kind of fork truck as claimed in claim 3, it is characterized in that, the mouth two of described threeway flow-limiting valve (61) also connects the oil revolving end of described hydraulic reservoir (5) by the second by pass valve (65), and described second by pass valve (65) is in parallel with described all-hydraulic steering gear (7).
5. the single pump hydraulic system of a kind of fork truck as claimed in claim 4, it is characterized in that, be provided with single-way flow restricting valve (11) between described hoist cylinder (1) and described first direction control cock (62), and be also provided with shutoff valve (12) between described single-way flow restricting valve (11) and described hoist cylinder (1).
6. the single pump hydraulic system of a kind of fork truck as claimed in claim 5, it is characterized in that, the mouth one of described threeway flow-limiting valve (61) is also by the first check valve (66) in parallel and the second check valve (67) described first direction control cock (62) and described second direction control cock (63) respectively.
7. the single pump hydraulic system of a kind of fork truck as claimed in claim 6, it is characterized in that, described all-hydraulic steering gear (7) comprises third direction control cock (73), is arranged on the 3rd by pass valve (74) between the input oil inlet end (71) of described all-hydraulic steering gear (7) and input oil revolving end (72) and in parallel with described third direction control cock (73);
Also comprise the 4th by pass valve (75), the 5th by pass valve (76), the 3rd check valve (77) and the 4th check valve (78) that are arranged between described third direction control cock (73) and described steering cylinder (3).
8. the single pump hydraulic system of a kind of fork truck as claimed in claim 1, is characterized in that, described third direction control cock (73) is provided with two-way quantitative pump (731).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510877796.3A CN105329817B (en) | 2015-12-04 | 2015-12-04 | A kind of single pump hydraulic system of fork truck |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510877796.3A CN105329817B (en) | 2015-12-04 | 2015-12-04 | A kind of single pump hydraulic system of fork truck |
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| CN105329817A true CN105329817A (en) | 2016-02-17 |
| CN105329817B CN105329817B (en) | 2018-08-17 |
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| CN201510877796.3A Active CN105329817B (en) | 2015-12-04 | 2015-12-04 | A kind of single pump hydraulic system of fork truck |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106082038A (en) * | 2016-08-13 | 2016-11-09 | 安徽合力股份有限公司 | A kind of fool proof forklift hydraulic system |
| CN113800437A (en) * | 2020-06-15 | 2021-12-17 | 苏州先锋物流装备科技有限公司 | Hydraulic system for multidirectional forklift and multidirectional forklift |
| CN114687813A (en) * | 2022-03-31 | 2022-07-01 | 哈尔滨汽轮机厂有限责任公司 | Fuel tank resistant multifunctional auxiliary circuit assembly and control method of auxiliary circuit assembly |
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| CN114687813A (en) * | 2022-03-31 | 2022-07-01 | 哈尔滨汽轮机厂有限责任公司 | Fuel tank resistant multifunctional auxiliary circuit assembly and control method of auxiliary circuit assembly |
| CN114687813B (en) * | 2022-03-31 | 2023-09-29 | 哈尔滨汽轮机厂有限责任公司 | Multifunctional auxiliary circuit assembly for fuel tank and control method of auxiliary circuit assembly |
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| CN105329817B (en) | 2018-08-17 |
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Denomination of invention: A single pump hydraulic system for forklifts Effective date of registration: 20231228 Granted publication date: 20180817 Pledgee: Anhui Ma'anshan rural commercial bank Limited by Share Ltd. Feixi branch Pledgor: ANHUI HECHA FORKLIFT Co.,Ltd. Registration number: Y2023980075351 |