CN103114624A - Load-sensitive operation system of loading machine - Google Patents

Load-sensitive operation system of loading machine Download PDF

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Publication number
CN103114624A
CN103114624A CN2013100591365A CN201310059136A CN103114624A CN 103114624 A CN103114624 A CN 103114624A CN 2013100591365 A CN2013100591365 A CN 2013100591365A CN 201310059136 A CN201310059136 A CN 201310059136A CN 103114624 A CN103114624 A CN 103114624A
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China
Prior art keywords
oil
load
valve
pipeline
way valve
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CN2013100591365A
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CN103114624B (en
Inventor
肖亨琳
洪波
胡金跃
孙洪喜
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WUXI KAIPU DYNAMIC CO Ltd
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WUXI KAIPU DYNAMIC CO Ltd
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Publication of CN103114624A publication Critical patent/CN103114624A/en
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Abstract

The invention relates to a loading machine, in particular to a load-sensitive operation system of the loading machine. An oil outlet of a travelling plunger pump is connected with a first pipeline, an energy accumulator and a two-position two-way electromagnetic reversing valve are connected at one end of the first pipeline in parallel, and the other end of the two-position two-way electromagnetic reversing valve is connected into an oil inlet of a pilot operated valve. A control oil port of the piloted operated valve is connected with a control port of a load-sensitive multi-path valve through a pipeline, an oil outlet of the pilot operated valve is connected with an oil tank, and a feedback oil port of the load-sensitive multi-path valve is connected with a feedback oil port of a working plunger pump. Control oil of the pilot operated valve in the load-sensitive operation system of the loading machine is supplied by an oil compensating pump in the travelling plunger pump, and one conventional pilot pump for supply oil is omitted and substituted. The working plunger pump adjusts pressure-flow output via the feedback oil port of the load-sensitive multi-path valve according to load changes, engine power is effectively utilized, temperature rise of hydraulic oil is controlled, and energy saving and environment friendliness are realized.

Description

The load-sensitive control system of loader
Technical field
The present invention relates to loader, especially relate to the load-sensitive control system of loader.
Background technology
At present, in domestic each large producer selection for the loader operation system, generally adopt the mechanical switch valve, this kind of structure can produce steering force large, have defects such as idle stroke, equipment fine motion be poor, these defects can cause driver's labour intensity to increase, and cause tired driver work to produce potential safety hazard.
In the market of the developed countries such as America and Europe, adopt pilot control to control loader especially abroad, its pilot control is by independently pioneer pump supply more.By handling pilot valve, promote main valve plug with guide oil, realize the action of loading arm and scraper bowl, this kind of maneuverability pattern is very light, reduced driver's labour intensity and be easy to realize the accurate location to swing arm and scraper bowl, but this kind of structure is also natural inevitable defect arranged: owing to adopting independently pioneer pump fuel feeding technical scheme, cause on the one hand the increase of design cost, also caused on the other hand complex structure, the trouble point of having increased complete machine.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of load-sensitive control system of simple in structure, ingenious, rational loader is provided, this system architecture is simple, reliability is high, handling comfort is strong, energy-conserving and environment-protective.
According to technical scheme provided by the invention: a kind of load-sensitive control system of loader, be characterised in that: an oil-out of walking plunger displacement pump is connected the first pipeline, described the first pipeline end accumulator in parallel, the 2/2-way solenoid operated directional valve, the oil-in of described 2/2-way solenoid operated directional valve other end access pilot control valve, the control port of pilot control valve connects the control mouth of load sensing multi-way valve by pipeline, the oil-out of pilot control valve connects fuel tank, the oil-out of load sensing multi-way valve is by oil return filter core access fuel tank, the equipment oil cylinder is connected with load sensing multi-way valve, the feedback hydraulic fluid port of the feedback hydraulic fluid port connection work plunger displacement pump of described load sensing multi-way valve.
As a further improvement on the present invention, on described the first pipeline, one way valve is installed.
Compared with prior art, advantage is in the present invention: in the load-sensitive control system of loader of the present invention the control oil of pilot control valve be by the walking plunger displacement pump inside slippage pump provide, reduced by a pioneer pump, replace traditional pioneer pump fuel feeding; The work plunger displacement pump is regulated the output of pressure-flow by the feedback hydraulic fluid port of load sensing multi-way valve according to the variation of load, effectively utilize engine power, controls the hydraulic oil temperature rise, realizes energy-conserving and environment-protective.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
The specific embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 1, comprise fuel tank 1, walking plunger displacement pump 2, one way valve 3, accumulator 4,2/2-way solenoid operated directional valve 5, pilot control valve 6, load sensing multi-way valve 7, equipment oil cylinder 8, work plunger displacement pump 9, oil return filter core 10, the first pipeline 11 etc.
As shown in Figure 1, the present invention is a kind of load-sensitive control system of loader, an oil-out of walking plunger displacement pump 2 is connected the first pipeline 11, on the first pipeline 11, one way valve 3 is installed, the first pipeline 11 ends accumulator 4 in parallel, 2/2-way solenoid operated directional valve 5, the oil-in of 2/2-way solenoid operated directional valve 5 other end access pilot control valves 6, pilot control valve 6(pilot control valve 6 is comprised of with the dump ram control valve the boom cylinder control valve) control port be connected load sensing multi-way valve 7(load sensing multi-way valve 7 by pipeline and formed by boom cylinder control valve and dump ram control valve) the control mouth, this effect of controlling mouthful mainly is the guide oil by arriving first control valve 6 is introduced in load sensing multi-way valve 7 to spool for control load sensing multi-way valve 7 in different operating positions, make the work fluid that enters load sensing multi-way valve 7 by work plunger displacement pump 9 selectively enter the large of equipment oil cylinder according to the difference of spool present position in load sensing multi-way valve 7, loculus meets extraneous requirements of one's work to reach, the oil-out of pilot control valve 6 connects fuel tank 1 ,the oil-out of load sensing multi-way valve 7 is by oil return filter core 10 access fuel tanks 1, and equipment oil cylinder 8 is connected with load sensing multi-way valve 7,
The feedback hydraulic fluid port of the feedback hydraulic fluid port connection work plunger displacement pump 9 of load sensing multi-way valve 7, the feedback hydraulic fluid port of work plunger displacement pump 9 is according to the variation of extraneous load.
The walk slippage pump of plunger displacement pump 2 inside of the present invention, provide pressure oil-source stable, low-pressure low flow to pilot control valve 6.
As shown in Figure 1, the present invention arranges oil circuit between walking plunger displacement pump 2 and pilot control valve 6, slippage pump by walking plunger displacement pump 2 inside provides pressure oil to pilot control valve 6, the feedback hydraulic fluid port cut-in operation plunger displacement pump 9 of load sensing multi-way valve 7, variation according to extraneous load, the swash plate of adjusting work plunger displacement pump 9 is realized the variation output of pressure-flow to reach work plunger displacement pump 9, in other words, motor provides according to the variation of load the power adapted, so just effectively utilize the power of motor, the waste of the power of having avoided quantitative system to cause, effectively controlled the temperature rise of hydraulic oil, reached the purpose of energy-conserving and environment-protective.The present invention is also for engine misses, the idle special circumstances of walking plunger displacement pump 2, adjust boom cylinder 8 height of drops by 2/2-way solenoid operated directional valve 5 access pilot control valves 6 in order to reach by accumulator 4 pressure oils, thereby guarantee the trouble free service of loader.

Claims (2)

1. the load-sensitive control system of a loader, it is characterized in that: an oil-out of walking plunger displacement pump (2) is connected the first pipeline (11), described the first pipeline (11) end accumulator (4) in parallel, 2/2-way solenoid operated directional valve (5), the oil-in of described 2/2-way solenoid operated directional valve (5) other end access pilot control valve (6), the control port of pilot control valve (6) connects the control mouth of load sensing multi-way valve (7) by pipeline, the oil-out of pilot control valve (6) connects fuel tank (1), the oil-out of load sensing multi-way valve (7) is by oil return filter core (10) access fuel tank (1), equipment oil cylinder (8) is connected with load sensing multi-way valve (7), the feedback hydraulic fluid port of the feedback hydraulic fluid port connection work plunger displacement pump (9) of described load sensing multi-way valve (7).
2. the load-sensitive control system of loader as claimed in claim 1, is characterized in that: one way valve (3) is installed on described the first pipeline (11).
CN201310059136.5A 2013-02-25 2013-02-25 The load-sensitive control system of loader Active CN103114624B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310059136.5A CN103114624B (en) 2013-02-25 2013-02-25 The load-sensitive control system of loader

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Application Number Priority Date Filing Date Title
CN201310059136.5A CN103114624B (en) 2013-02-25 2013-02-25 The load-sensitive control system of loader

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CN103114624A true CN103114624A (en) 2013-05-22
CN103114624B CN103114624B (en) 2015-11-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103953090A (en) * 2014-05-12 2014-07-30 德州德工机械有限公司 Grafting load sensing energy-saving hydraulic system of loader
CN104533774A (en) * 2014-12-03 2015-04-22 安徽博一流体传动股份有限公司 Variable displacement piston pump for loading machine
CN104828725A (en) * 2014-08-28 2015-08-12 北汽福田汽车股份有限公司 Hydraulic control system and engineering machinery having hydraulic control system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010121726A (en) * 2008-11-20 2010-06-03 Caterpillar Japan Ltd Hydraulic control system in work machine
CN201636093U (en) * 2010-01-14 2010-11-17 上海华丰工业控制技术工程有限公司 Hydraulic energy-storing emergency device and field movable boarding ladder using the same
CN201739265U (en) * 2010-05-06 2011-02-09 沈阳北方交通重工有限公司 Single triple fixed displacement pump oil supply device for development machine
CN102108982A (en) * 2009-12-29 2011-06-29 沃尔沃建造设备控股(瑞典)有限公司 Negative control type hydraulic system
CN102420552A (en) * 2011-12-03 2012-04-18 太原理工大学 Control loop and control method for improving starting and stopping performance of motor
CN202718623U (en) * 2012-07-19 2013-02-06 山河智能装备股份有限公司 Key drilling action single-pump hydraulic control loop of cutting drilling machine
CN203174660U (en) * 2013-02-25 2013-09-04 无锡开普机械有限公司 Load-sensitive control system of loading machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010121726A (en) * 2008-11-20 2010-06-03 Caterpillar Japan Ltd Hydraulic control system in work machine
CN102108982A (en) * 2009-12-29 2011-06-29 沃尔沃建造设备控股(瑞典)有限公司 Negative control type hydraulic system
CN201636093U (en) * 2010-01-14 2010-11-17 上海华丰工业控制技术工程有限公司 Hydraulic energy-storing emergency device and field movable boarding ladder using the same
CN201739265U (en) * 2010-05-06 2011-02-09 沈阳北方交通重工有限公司 Single triple fixed displacement pump oil supply device for development machine
CN102420552A (en) * 2011-12-03 2012-04-18 太原理工大学 Control loop and control method for improving starting and stopping performance of motor
CN202718623U (en) * 2012-07-19 2013-02-06 山河智能装备股份有限公司 Key drilling action single-pump hydraulic control loop of cutting drilling machine
CN203174660U (en) * 2013-02-25 2013-09-04 无锡开普机械有限公司 Load-sensitive control system of loading machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103953090A (en) * 2014-05-12 2014-07-30 德州德工机械有限公司 Grafting load sensing energy-saving hydraulic system of loader
CN104828725A (en) * 2014-08-28 2015-08-12 北汽福田汽车股份有限公司 Hydraulic control system and engineering machinery having hydraulic control system
CN104828725B (en) * 2014-08-28 2017-10-10 北汽福田汽车股份有限公司 Hydraulic control system and the engineering machinery with the hydraulic control system
CN104533774A (en) * 2014-12-03 2015-04-22 安徽博一流体传动股份有限公司 Variable displacement piston pump for loading machine

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