CN102295250B - Dual pump converging energy-saving control system for hydraulic system of forklift truck - Google Patents
Dual pump converging energy-saving control system for hydraulic system of forklift truck Download PDFInfo
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- CN102295250B CN102295250B CN201110252709.7A CN201110252709A CN102295250B CN 102295250 B CN102295250 B CN 102295250B CN 201110252709 A CN201110252709 A CN 201110252709A CN 102295250 B CN102295250 B CN 102295250B
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Abstract
The invention discloses a dual pump converging energy-saving control system for a hydraulic system of a forklift truck. The system comprises a filter screen I, a filter screen II, a hydraulic pump I, a hydraulic pump II, a check valve I, a check valve II, an oil inlet path, a lifting device, an inclining device, an oil return path, and an unloading device; the filter screen I is connected with an oil inlet end of the hydraulic pump I; an oil outlet end of the hydraulic pump I is connected with the check valve I; the filter screen II is connected with the oil inlet end of the hydraulic pump II; the oil outlet end of the hydraulic pump II is connected with the check valve II; the check valve I and the check valve II are connected with the lifting device through the oil inlet path; the lifting device is connected with the inclining device; and one end of the unloading device is connected with the inclining device through the oil return path, and the other end of the unloading device is connected with an oil path between the hydraulic pump II and the check valve II. The system has a simple and compact structure, long service life, and a wide application range, is convenient to assemble, easy to maintain, and low in manufacturing cost, and the lifting force of the forklift truck can be improved by more than one time.
Description
Technical field
The present invention relates to a kind of Dual pump converging energy-saving control system for hydraulic system of forklift truck.
Background technology
Fork truck is widely used in factory, warehouse, station, harbour etc. and locates, and carries out the work such as handling, carrying, pile, de-stacking and short range transportation of member or package goods.
Fork truck is generally to rely on bont and two devices of leaning device jointly to complete cargo handing.
CN 200610050420.6 discloses a kind of full hydraulic electric forklift hydraulic system, although this system only can complete fuel feeding task with a gear type pump, but, in the situation that gear type pump delivery quality is certain, the hoisting force of fork truck is also certain, if the gravity of weight is greater than the hoisting force of fork truck, fork truck is also by helpless, and Applicable scope is less.And this system is owing to only having a gear type pump fuel feeding, so along with long use or wearing and tearing, its serviceability can be under some influence, can cause thus the work stability and reliability of fork truck to be affected, and maintenance is trouble, service life is short.In addition, the price of fork truck also differs greatly because of the size of hoisting force, and energy consumption is higher.
Summary of the invention
The above-mentioned defect existing in order to overcome prior art, the invention provides a kind of long service life, is convenient to maintenance, and can effectively strengthen the Dual pump converging energy-saving control system for hydraulic system of forklift truck of hoisting force.
Technical scheme of the present invention is: it comprises Hydraulic Pump I, Hydraulic Pump II, filtering net I, filtering net II, check valve I, check valve II, in-line, bont, leaning device, oil return line, relief arrangement, described filtering net I is connected with Hydraulic Pump I oil inlet end, Hydraulic Pump I oil outlet end is connected with check valve I, filtering net II is connected with Hydraulic Pump II oil inlet end, Hydraulic Pump II oil outlet end is connected with check valve II, check valve I is all connected with bont by in-line with check valve II, and bont is connected with leaning device; Relief arrangement one end is connected with leaning device by oil return line, and between the other end and Hydraulic Pump II and check valve II, oil circuit is connected.
The present invention's Dual pump converging energy-saving control system for hydraulic system of forklift truck control flow is:
(1) calculate the uninterrupted QP1 that under current working, Hydraulic Pump I can provide;
(2) calculate bont and leaning device under current working and meeting operator's speed and control big or small Q1, the Q2 of required pressure oil flow corresponding under requiring;
(3) if (Q1+Q2)≤QP1 allows Hydraulic Pump II in unloading condition; Otherwise allow Hydraulic Pump II in normal fuel injection state.
But for preventing that near the fluctuation (QP1) of required pressure oil flow and size from causing Hydraulic Pump II a little while in normal fuel injection, a little while again in unloading condition, thereby causes system vibration situation.Determining whether while needing the off-load of Hydraulic Pump II, introduce a border redundancy.
When Hydraulic Pump II is transformed into mode of operation from unloading condition, need to meet (Q1+Q2) >=(QP1+E1); From mode of operation, be switched to unloading condition and need to meet (Q1+Q2)≤(QP1-E2).
Use the present invention's Dual pump converging energy-saving control system for hydraulic system of forklift truck, can avoid promoting or when the kinematic velocity of leaning device requirement is slow, also, when the required throughput ratio of reality hour, can effectively avoid two pumps to be all operated under pressure state, waste energy.
The present invention is simple in structure, compact, easy to assembly, and maintenance is easy, long service life, and low cost of manufacture, applied widely, can make forklift lifting power be enhanced about more than once.
Accompanying drawing explanation
Fig. 1 is the structural representation of Dual pump converging energy-saving control system for hydraulic system of forklift truck embodiment of the present invention;
Fig. 2 is the control method diagram of circuit of the embodiment of the present invention shown in Fig. 1;
Fig. 3 is hydraulic pump works/off-load transfer principle figure.
The specific embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
With reference to Fig. 1, the present embodiment comprises Hydraulic Pump I 2, Hydraulic Pump II 4, filtering net I 1, filtering net II 11, check valve I 3, check valve II 5, in-line 6, bont 7, leaning device 8, oil return line 9, relief arrangement 10, described filtering net I 1 is connected with Hydraulic Pump I 2 oil inlet ends, Hydraulic Pump I 2 oil outlet ends are connected with check valve I 3, filtering net II 11 is connected with Hydraulic Pump II 4 oil inlet ends, Hydraulic Pump II 4 oil outlet ends are connected with check valve II 5, check valve I 3 is all connected with bont 7 by in-line 6 with check valve II 5, and bont 7 is connected with leaning device 8; Relief arrangement 10 one end are connected with leaning device 8 by oil return line 9, and the other end is connected with the oil circuit between Hydraulic Pump II 4 and check valve II 5.
During work, filtering net I 1, filtering net II 11 are placed in to hydraulic reservoir top, filtering net I 1 one end, filtering net II 11 one end, relief arrangement 10 one end are respectively by different oil circuit access hydraulic reservoirs.
With reference to Fig. 2, use the control method of the present invention's Dual pump converging energy-saving control system for hydraulic system of forklift truck to be:
First carry out initial step 01;
Then, perform step 02, calculate the flow that under current working, Hydraulic Pump I 2 provides; The data such as product description that provide according to Hydraulic Pump production firm, calculate the uninterrupted QP1 that Hydraulic Pump I 2 provides under current working, and this uninterrupted will be for subsequent calculations;
Then, perform step 03, according to the weight and the lift height that are raised device lifting, calculate bont 7 and the required pressure oil flow of leaning device 8 Q1, Q2; Relief arrangement 10 is realized circulating of Hydraulic Pump II 4 flows;
After execution of step 03, execution step 04, judge whether Hydraulic Pump I 2 deliverys quality are greater than the required pressure oil flow of hydraulic efficiency pressure system, the required pressure oil flow of hydraulic efficiency pressure system is herein bont 7 and the required pressure oil flow of leaning device 8 in step 03, i.e. (Q1+Q2):
If yes, Hydraulic Pump I 2 delivery quality QP1 are greater than the required pressure oil flow of hydraulic efficiency pressure system (Q1+Q2), perform step 05, and 4 off-loads of Hydraulic Pump II, are connected with fuel tank by relief arrangement 10, realize the off-load of Hydraulic Pump II 4;
After execution of step 05, perform step 09, judge the required pressure oil flow of hydraulic efficiency pressure system whether be greater than Hydraulic Pump I 2 deliverys quality and border redundancy and:
If yes, the required pressure oil flow of hydraulic efficiency pressure system be greater than Hydraulic Pump I 2 deliverys quality and border redundancy and, perform step 10, Hydraulic Pump II 4 normal fuel injections;
If NO, the required pressure oil flow of hydraulic efficiency pressure system be less than or equal to Hydraulic Pump I 2 deliverys quality and border redundancy and, return to step 05;
Performing step at 04 o'clock, if Hydraulic Pump I 2 deliverys quality are to be less than or equal to the required pressure oil flow of hydraulic efficiency pressure system, perform step 06, Hydraulic Pump II 4 normal fuel injections;
After execution of step 06, perform step 07, judge whether the required pressure oil flow of hydraulic efficiency pressure system is less than the poor of Hydraulic Pump I 2 deliverys quality and border redundancy:
If NO, the required pressure oil flow of hydraulic efficiency pressure system is more than or equal to the poor of Hydraulic Pump I 2 deliverys quality and border redundancy, returns to step 06, and Hydraulic Pump II 4 continues normal fuel injection;
If yes, the required pressure oil flow of hydraulic efficiency pressure system is less than the poor of Hydraulic Pump I 2 deliverys quality and border redundancy, performs step 08, and 4 off-loads of Hydraulic Pump II complete the energy-conservation control of hydraulic control system Dual-pump flow-converging thus.
Fig. 3 is hydraulic pump works/off-load transfer principle figure.Determining whether while needing 4 off-load of Hydraulic Pump II, introduced the concept of a border redundancy, border redundancy is a deviate, in small scope, allows.Thereby be conducive to prevent that required pressure oil flow and size (Q1+Q2) fluctuate and cause Hydraulic Pump II 4 a little while in normal fuel injection near (QP1), a little while again in unloading condition, cause the situation of system vibration.
When Hydraulic Pump II 4 is transformed into mode of operation from unloading condition, need to meet (Q1+Q2) >=(QP1+E1); And be switched to unloading condition from mode of operation, need to meet (Q1+Q2)≤(QP1-E2).
In Fig. 3, E1 and E2 represent respectively redundancy border and lower redundancy border.
Use the present invention's Dual pump converging energy-saving control system for hydraulic system of forklift truck, can be when the kinematic velocity promoting or leaning device requires be slow, also, when the required throughput ratio of reality hour, effectively avoid two pumps to be all operated under pressure state, waste energy.
Claims (1)
1. a Dual pump converging energy-saving control system for hydraulic system of forklift truck, it is characterized in that, comprise Hydraulic Pump I, Hydraulic Pump II, filtering net I, filtering net II, check valve I, check valve II, in-line, bont, leaning device, oil return line, relief arrangement, described filtering net I is connected with Hydraulic Pump I oil inlet end, Hydraulic Pump I oil outlet end is connected with check valve I, filtering net II is connected with Hydraulic Pump II oil inlet end, Hydraulic Pump II oil outlet end is connected with check valve II, check valve I is all connected with bont by in-line with check valve II, and bont is connected with leaning device; Relief arrangement one end is connected with leaning device by oil return line, and between the other end and Hydraulic Pump II and check valve II, oil circuit is connected;
Dual pump converging energy-saving control system for hydraulic system of forklift truck control flow is:
(1) calculate the uninterrupted QP1 that under current working, Hydraulic Pump I can provide;
(2) according to the weight and the lift height that are raised device lifting, calculate bont and the required pressure oil flow of leaning device Q1, Q2;
(3) if (Q1+Q2)≤QP1 allows Hydraulic Pump II in unloading condition; Otherwise allow Hydraulic Pump II in normal fuel injection state;
When Hydraulic Pump II is transformed into mode of operation from unloading condition, need to meet (Q1+Q2) >=(QP1+E1); And be switched to unloading condition from mode of operation, need to meet (Q1+Q2)≤(QP1-E2); E1 and E2 represent respectively redundancy border and lower redundancy border.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110252709.7A CN102295250B (en) | 2011-08-30 | 2011-08-30 | Dual pump converging energy-saving control system for hydraulic system of forklift truck |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110252709.7A CN102295250B (en) | 2011-08-30 | 2011-08-30 | Dual pump converging energy-saving control system for hydraulic system of forklift truck |
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| CN102295250A CN102295250A (en) | 2011-12-28 |
| CN102295250B true CN102295250B (en) | 2014-02-12 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104405706A (en) * | 2014-09-18 | 2015-03-11 | 芜湖高昌液压机电技术有限公司 | Double-pump relief circuit of scissor lift |
| CN105545550A (en) * | 2014-10-28 | 2016-05-04 | 中国航空工业集团公司西安飞机设计研究所 | Multifunctional fuel pump |
| CN107725504B (en) * | 2017-09-21 | 2020-03-06 | 林德（中国）叉车有限公司 | Hydraulic system capable of providing proper performance for load and hydraulic control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058395A (en) * | 2006-04-19 | 2007-10-24 | 浙江佳力科技股份有限公司 | Full hydraulic electric forklift hydraulic system |
| CN201040701Y (en) * | 2007-04-20 | 2008-03-26 | 天津港第四港埠公司 | Fork lift hydraulic driving device |
| EP2236453A1 (en) * | 2009-04-04 | 2010-10-06 | Mahle International GmbH | Hydraulic lifting assembly for forklifts |
| CN202201692U (en) * | 2011-08-30 | 2012-04-25 | 陈海波 | Double-pump interflow energy saving controlling device of fork truck hydraulic system |
-
2011
- 2011-08-30 CN CN201110252709.7A patent/CN102295250B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058395A (en) * | 2006-04-19 | 2007-10-24 | 浙江佳力科技股份有限公司 | Full hydraulic electric forklift hydraulic system |
| CN201040701Y (en) * | 2007-04-20 | 2008-03-26 | 天津港第四港埠公司 | Fork lift hydraulic driving device |
| EP2236453A1 (en) * | 2009-04-04 | 2010-10-06 | Mahle International GmbH | Hydraulic lifting assembly for forklifts |
| CN202201692U (en) * | 2011-08-30 | 2012-04-25 | 陈海波 | Double-pump interflow energy saving controlling device of fork truck hydraulic system |
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