CN103057494B - Closed fhdraulic system and comprise the engineering machinery chassis of this system - Google Patents
Closed fhdraulic system and comprise the engineering machinery chassis of this system Download PDFInfo
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- CN103057494B CN103057494B CN201310014301.5A CN201310014301A CN103057494B CN 103057494 B CN103057494 B CN 103057494B CN 201310014301 A CN201310014301 A CN 201310014301A CN 103057494 B CN103057494 B CN 103057494B
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- 238000010276 construction Methods 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000009194 climbing Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a kind of closed fhdraulic system, for the output speed according to driving engine in construction machinery and equipment, control CD-ROM drive motor, this system comprises the main pump for providing oil sources for this CD-ROM drive motor.This system comprises proportion magnetic valve and the testing agency for detecting this driving engine output speed further, and this proportion magnetic valve is according to the output signal of this testing agency, and the output discharge capacity of pressure output control to this main pump controls.Closed fhdraulic system of the present invention and be integrated with the engineering machinery chassis of this system, has speed of response, higher control accuracy faster, can make to adopt the engineering machinery chassis of this novel control mode reduce oil consumption and have better stepless speed control performance.
Description
Technical field
The present invention relates to fluid control, more specifically, is a kind of closed fhdraulic system and the engineering machinery chassis comprising this system.
Background technology
At construction machinery industry, Closed Hydraulic control system has a wide range of applications, and it adopts closed hydraulic loop as fluid control means.Usually, hydraulic circuit comprises main pump and DA valve (rotation speed feedback control valve) for providing oil sources for CD-ROM drive motor in construction machinery and equipment, and wherein DA valve is vitals wherein, the hydraulic variable flow valve that DA valve is namely relevant to rotating speed.Its principle of work is: for making discharge of main pump in closed system relevant to the engine speed in construction machinery and equipment, introduces one in systems in which and detects restriction; The pressure reduction detecting restriction place is directly proportional to engine speed, and it is after DA valve, is enlarged into a control presssure; One of them control chamber that this control presssure arrives main pump variable piston makes main pump start variable, thus reaches the object controlled discharge of main pump.
As seen from the above description, DA valve control technology is the rotating speed by DA valve restriction place pressure reduction indirect detection driving engine.But, due to the leakage of slippage pump and the reason such as flowrate variation is sluggish, such that DA valve control technology speed of response is slow, control accuracy is low.
On the other hand, the engineering machinery chassis of above-mentioned closed hydraulic loop control technology is adopted to have following features: to be improved by engine speed by " open the throttle wide ", DA valve restriction detects pressure reduction and amplifies the control presssure exported as being directly proportional to engine speed, and the swash plate pivot angle of such pump increases and gives it the gun; When resistance to motion increases (such as: climbing), in order to make the unlikely overload of driving engine, DA valve can detect restriction pressure reduction and control main pump and regulate moving velocity, makes it to match with the available output of driving engine.For the same reason, namely DA valve is indirect detection engine speed, if there is slippage pump leakage phenomenon, and the delay detected due to flowrate variation, the slow and control accuracy of the corresponding speed of machinery chassis can be caused to reduce.
Therefore, the engineering machinery chassis of the novel Closed Hydraulic control system needing a kind of fast response time, control accuracy high and employing Closed Hydraulic control system.
Summary of the invention
Object of the present invention, is to solve the problems referred to above existing in existing Closed Hydraulic control system, thus provides a kind of novel Closed Hydraulic control system and adopt the engineering machinery chassis of this system.
Closed fhdraulic system of the present invention, for the output speed according to driving engine in construction machinery and equipment, controls CD-ROM drive motor, and this system comprises the main pump for providing oil sources for this CD-ROM drive motor.This system comprises proportion magnetic valve and the testing agency for detecting this driving engine output speed further, and this proportion magnetic valve is according to the output signal of this testing agency, and the output discharge capacity of pressure output control to this main pump controls.
Preferably, this testing agency comprises:
Sample circuit, for sampling to the rotating speed of driving engine, and output speed signal;
Frequency transmitter, this frequency transmitter is connected with this sample circuit, send for carrying out frequency change to the tach signal of sampling; And,
Amplifier, for amplifying becoming through frequency the tach signal sent, and outputs control signals to described proportion magnetic valve.
Preferably, described driving engine is provided with an electrical generator coaxial with it, and described sample circuit is sampled by the rotating speed of this electrical generator to described driving engine.
Preferably, the variable piston that described main pump comprises main pump swash plate and is connected with main pump swash plate, described proportion magnetic valve is connected with this variable piston, and promotes this main pump swash plate by exporting described control presssure, controls the output discharge capacity of described main pump.
Preferably, described proportion magnetic valve is also connected with the slippage pump that is its fuel feeding.
Present invention also offers a kind of engineering machinery chassis, it comprises above-mentioned closed fhdraulic system.
Closed fhdraulic system of the present invention and be integrated with the engineering machinery chassis of this system, has speed of response, higher control accuracy faster, can make to adopt the engineering machinery chassis of this novel control mode reduce oil consumption and have better stepless speed control performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of closed fhdraulic system of the present invention;
Fig. 2 is the composition schematic diagram for the testing agency of control ratio electromagnetic valve in closed fhdraulic system of the present invention;
Fig. 3 is the schematic flow sheet utilizing closed fhdraulic system of the present invention to control main pump.
Detailed description of the invention
Below in conjunction with accompanying drawing, the structure of closed fhdraulic system of the present invention composition and principle of work are described in detail.
As shown in Figure 1, for the composition schematic diagram of closed fhdraulic system of the present invention, this system is used for the output speed according to (such as rock drilling jumbo, wheel shovel, roller etc.) driving engine 10 in construction machinery and equipment, the CD-ROM drive motor 20 of construction machinery and equipment is controlled, in engineering mechanical device, this CD-ROM drive motor 20 can be variable piston motor, also can be quantitative plunger motor.By reference to the accompanying drawings, this system comprises the main pump 110 for providing oil sources for CD-ROM drive motor 20, and routinely, main pump comprises main pump swash plate 111, variable piston 112, thrust reverser mechanism 113 and thrust plate 114.Variable piston 112 is connected with main pump swash plate 111, and its inside is provided with can the centralizing spring of self-return, by mobile variable piston 112, can change the size of main pump swash plate 111 pivot angle, thus change the output discharge capacity of main pump.Thrust reverser mechanism 113 and system high pressure side connect together, and utilize high pressure control variable piston 112 oppositely movement, thus reduce main pump swash plate 111 pivot angle, namely reduce the output discharge capacity of main pump.Thrust plate 114 can around its center shaft adjustment certain angle, in order to the positive acting of the acting in opposition and proportion magnetic valve 120 pairs of main pump swash plate 111 pivot angles that balance thrust reverser mechanism 113 pairs of main pump swash plate 111 pivot angles.
Especially, this system comprises proportion magnetic valve 120 and the testing agency 130(reference Fig. 2 for detecting this driving engine output speed further), proportion magnetic valve 120 is according to the output signal of testing agency 130, and the output discharge capacity of pressure output control to main pump 110 controls.
Composition graphs 1,2, testing agency 130 comprises sample circuit 131, frequency delivery device 132 and amplifier 133.Particularly, sample circuit 131 for sampling to the rotating speed of driving engine 10, and exports the tach signal of sign driving engine 10 rotating speed; Frequency transmitter 132 is connected with sample circuit 131, and send for carrying out frequency change to sampled tach signal, its exports the curtage signal proportional with tach signal; Amplifier is conventional operational amplification circuit, for amplifying becoming through frequency the tach signal sent, carrys out control ratio electromagnetic valve to obtain enough curtage signals.
The rotating speed sampling of sample circuit 131 pairs of driving engines 10, can utilize and come the signal sampling of the integral shaft generator (not shown) be arranged on driving engine 10.Because this electrical generator and driving engine 10 are coaxially arranged, therefore it exports the frequency signal relevant to engine speed by sample circuit 131.Sample circuit 131 can adopt conventional frequency sampling circuit to form.Certainly, also can be sampled by the tach signal of other means to driving engine 10, conventional equipment or the equipment such as such as tachogen.
Composition graphs 1 again, proportion magnetic valve 120 is connected with variable piston 112, and promotes this main pump swash plate 111 by the control presssure exported, thus reaches the object controlled the output discharge capacity of main pump.
In addition, as shown in Figure 1, proportion magnetic valve 120 is also connected with the slippage pump 140 that is its fuel feeding.Slippage pump 140 can be quantitative gear pump, and it can be proportion magnetic valve 120 and provides oil sources, to control variable piston 112.
As shown in Figure 3, be the schematic flow sheet utilizing closed fhdraulic system of the present invention to control main pump.Composition graphs 1,2, as shown in Figure 3, in the step s 100, detects the rotating speed of driving engine, this detection by sample circuit 131 to be arranged on driving engine 10 and the frequency signal of the electrical generator coaxial with it is sampled; In step s 200, frequency delivery device 132 is utilized to amplify the frequency signal detecting sampling through over-sampling circuit 131, and outgoing current or voltage signal; In step S300, amplifier 133 is utilized to amplify the curtage signal exported; In step S400, will be delivered to proportion magnetic valve 120 through amplifying signal, proportion magnetic valve 120, according to this signal, exports the pilot control pressure be directly proportional to engine speed; In step S500, this pilot control pressure flows to main pump 110, to control the output discharge capacity of main pump.
Closed fhdraulic system of the present invention, can be incorporated in engineering machinery chassis, thus forms the engineering machinery chassis including this closed fhdraulic system.(such as rock drilling jumbo, wheel shovel, roller etc.) as shown in Figure 1, this hydraulic efficiency pressure system are added CD-ROM drive motor 20, can form the engineering machinery chassis that this is novel.CD-ROM drive motor 20 is for providing drive torque for output mechanism, and it can be variable piston motor, also can be quantitative plunger motor etc.
Closed fhdraulic system of the present invention and be integrated with the engineering machinery chassis of this system, due to the mode adopting hydraulic pressure and electrical control to combine, compared with traditional DA valve mode, not only have automatically distribute power, the features such as automatic reduction of speed, speed-regulating range width of climbing, also there is speed of response, higher control accuracy faster, can make to adopt the engineering machinery chassis of this novel control mode reduce oil consumption and have better stepless speed control performance.
Claims (5)
1. a closed fhdraulic system, for the output speed according to driving engine in construction machinery and equipment, CD-ROM drive motor is controlled, this system comprises the main pump for providing oil sources for this CD-ROM drive motor, it is characterized in that, this system comprises proportion magnetic valve and the testing agency for detecting this driving engine output speed further, this proportion magnetic valve is according to the output signal of this testing agency, the output discharge capacity of pressure output control to this main pump controls, the variable piston that described main pump comprises main pump swash plate and is connected with main pump swash plate, described proportion magnetic valve is connected with this variable piston, and promote this main pump swash plate by exporting described control presssure, the output discharge capacity of described main pump is controlled.
2. closed fhdraulic system according to claim 1, is characterized in that, this testing agency comprises:
Sample circuit, for sampling to the rotating speed of driving engine, and output speed signal;
Frequency transmitter, this frequency transmitter is connected with this sample circuit, send for carrying out frequency change to the tach signal of sampling; And,
Amplifier, for amplifying becoming through frequency the tach signal sent, and outputs control signals to described proportion magnetic valve.
3. closed fhdraulic system according to claim 2, is characterized in that, described driving engine is provided with an electrical generator coaxial with it, and described sample circuit is sampled by the rotating speed of this electrical generator to described driving engine.
4. closed fhdraulic system according to claim 1, is characterized in that, described proportion magnetic valve is also connected with a slippage pump being its fuel feeding.
5. an engineering machinery chassis, is characterized in that, comprises the closed fhdraulic system according to any one of claim 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310014301.5A CN103057494B (en) | 2013-01-15 | 2013-01-15 | Closed fhdraulic system and comprise the engineering machinery chassis of this system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310014301.5A CN103057494B (en) | 2013-01-15 | 2013-01-15 | Closed fhdraulic system and comprise the engineering machinery chassis of this system |
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| CN103057494A CN103057494A (en) | 2013-04-24 |
| CN103057494B true CN103057494B (en) | 2015-07-29 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103350955B (en) * | 2013-07-25 | 2015-06-03 | 中联重科股份有限公司 | Crane, negative power system, negative power control method and negative power control equipment |
| CN108317132B (en) * | 2018-03-26 | 2024-04-02 | 江苏徐工工程机械研究院有限公司 | Control system for preventing rotation overload of impeller of sand throwing fire extinguishing vehicle |
| CN115681232B (en) * | 2022-11-04 | 2023-09-01 | 阿特拉斯叉车(杭州)有限公司 | Hydraulic system and four-way forklift with same |
Citations (6)
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|---|---|---|---|---|
| US5064351A (en) * | 1988-11-02 | 1991-11-12 | Vickers Systems Limited | Variable displacement pumps |
| JP2004028263A (en) * | 2002-06-27 | 2004-01-29 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Hydraulic circuit for construction machinery |
| CN2903010Y (en) * | 2006-04-26 | 2007-05-23 | 三一重工股份有限公司 | Full hydraulic controlling apparatus with load sensing for empty container stacking machine |
| CN101237212A (en) * | 2008-02-27 | 2008-08-06 | 王雪霖 | Automatic shift frequency and voltage constant diesel oil generator unit |
| CN202301241U (en) * | 2011-11-03 | 2012-07-04 | 徐州雷曼机械科技有限公司 | Synchronous control device for engine rotating speed and main pump delivery of hydraulic traveling machine |
| CN203111081U (en) * | 2013-01-15 | 2013-08-07 | 阿特拉斯科普柯(南京)建筑矿山设备有限公司 | Closed type hydraulic system and engineering machinery chassis with same |
-
2013
- 2013-01-15 CN CN201310014301.5A patent/CN103057494B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5064351A (en) * | 1988-11-02 | 1991-11-12 | Vickers Systems Limited | Variable displacement pumps |
| JP2004028263A (en) * | 2002-06-27 | 2004-01-29 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Hydraulic circuit for construction machinery |
| CN2903010Y (en) * | 2006-04-26 | 2007-05-23 | 三一重工股份有限公司 | Full hydraulic controlling apparatus with load sensing for empty container stacking machine |
| CN101237212A (en) * | 2008-02-27 | 2008-08-06 | 王雪霖 | Automatic shift frequency and voltage constant diesel oil generator unit |
| CN202301241U (en) * | 2011-11-03 | 2012-07-04 | 徐州雷曼机械科技有限公司 | Synchronous control device for engine rotating speed and main pump delivery of hydraulic traveling machine |
| CN203111081U (en) * | 2013-01-15 | 2013-08-07 | 阿特拉斯科普柯(南京)建筑矿山设备有限公司 | Closed type hydraulic system and engineering machinery chassis with same |
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| CN103057494A (en) | 2013-04-24 |
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Address after: 210038 Hengtai Road, Nanjing economic and Technological Development Zone, Nanjing, Jiangsu Province, No. 2 Patentee after: An Bai Tuo (Nanjing) Construction Mine Equipment Co., Ltd. Address before: 210038 Hengtai Road, Nanjing economic and Technological Development Zone, Nanjing, Jiangsu Province, No. 2 Patentee before: Atlas Copco (Nanjing) Construction & Mining Equipment Ltd. |