CN105065348A - Soft start walking system - Google Patents

Soft start walking system Download PDF

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Publication number
CN105065348A
CN105065348A CN201510387187.XA CN201510387187A CN105065348A CN 105065348 A CN105065348 A CN 105065348A CN 201510387187 A CN201510387187 A CN 201510387187A CN 105065348 A CN105065348 A CN 105065348A
Authority
CN
China
Prior art keywords
valve
walking
motor
oil outlet
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201510387187.XA
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Chinese (zh)
Other versions
CN105065348B (en
Inventor
杜媛英
金开
袁澎涛
尚长春
张武
郝昱宇
杨宏亮
赵天鹏
耿阳婕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian University of Science and Technology
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Xian University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian University of Science and Technology filed Critical Xian University of Science and Technology
Priority to CN201510387187.XA priority Critical patent/CN105065348B/en
Publication of CN105065348A publication Critical patent/CN105065348A/en
Application granted granted Critical
Publication of CN105065348B publication Critical patent/CN105065348B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed

Abstract

The invention discloses a soft start walking system comprising a variable pump, a constant delivery pump, a main overflow valve, a pilot overflow valve, a walking control valve, a walking reversing valve, a solenoid valve, an electric control unit, a high-low speed switch, a first pressure switch, a second pressure switch, a walking motor, a walking motor variable mechanism and an oil tank; an oil outlet of the variable pump is connected with an inlet of the walking reversing valve and an inlet of the main overflow valve; an oil outlet of the constant delivery pump is respectively connected with oil inlets of the pilot overflow valve, the solenoid valve and the walking control valve; an oil outlet of the walking control valve is connected with a control port a and a control port b of the walking reversing valve, thus controlling the walking reversing valve to reverse; an oil outlet of the solenoid valve is connected with the walking motor variable mechanism so as to control the motor to change displacement. The soft start walking system intelligently controls the machine to start in a low speed mode under a high speed mode, and automatically switches to the high speed mode, thus preventing huge pressure impact caused by high speed starting, and improving life and reliability of the whole machine.

Description

A kind of soft start running gear
Technical field
The present invention relates to running gear, be specifically related to a kind of soft start running gear.
Background technique
Hydraulic shovel has double speed walking mode usually, realizes (small displacement) and low speed (huge discharge) two kinds of walking functions at a high speed by changing running motor discharge capacity.Excavator complete machine is from great, and walking starts to be impacted greatly, and particularly under fast mode starts, motor impact pressure reaches system oil pressure relief sometimes, and excessive impact load reduces the reliability of complete machine, has had a strong impact on the working life of running motor and speed reducer.
In prior art, by the control switch on instrument panel, the speed of travel of Non-follow control machine, once walking mode is determined, then machine starts, walks and brakes stopping in this mode, its principle is as Fig. 1, comprise instrument panel, ECU (Electrical Control Unit), running motor discharge capacity switching mechanism, walking main valve stem, the original papers such as pressure switch, the signal of pressure switch and the high low speed signal of instrument panel input ECU (Electrical Control Unit) simultaneously, and ECU (Electrical Control Unit) is according to the control logic preset, export control signal to running motor discharge capacity COMM communication, control motor displacement.
Summary of the invention
For solving the problem, the invention provides a kind of soft start running gear, can intelligent control machine low speed start in high speed mode, and then automatically switch to fast mode, avoid the immense pressure impact that high-speed starting brings, improve reliability and the working life of complete machine.
For achieving the above object, the technological scheme that the present invention takes is:
A kind of soft start running gear, comprise variable displacement pump, metering pump, main relief valve, precursor overflow valve, travel control valve, walking selector valve, solenoid valve, ECU (Electrical Control Unit), high low speed switch, the first pressure switch, the second pressure switch, running motor, running motor stroking mechanism and fuel tank, the oil outlet of variable displacement pump is connected with the walking import of selector valve, the import of main relief valve respectively; The oil outlet of metering pump is connected with the filler opening of precursor overflow valve, solenoid valve and travel control valve respectively; The oil outlet of travel control valve is connected with control mouth a, b of walking selector valve respectively, controls the transposition of walking selector valve; The oil outlet of solenoid valve is connected with running motor stroking mechanism, controls motor and changes discharge capacity; The oil outlet of walking selector valve is connected with filler opening A, the return opening B of motor respectively, provides work oil to motor; The return opening of walking selector valve, main relief valve, precursor overflow valve, travel control valve and solenoid valve is all connected with fuel tank, and variable displacement pump is connected with fuel tank with the inlet port of metering pump.
Preferably, described high low speed switch is used for manual input switches amount signal, adopts rocker switch.
Preferably, described high low speed switch adopts the key switch be integrated in display device.
Wherein, the on-off model typical hardware filtering process inputted, do not need special software module process, control program can be write based on the software environment of general industry controller such as BODAS, CoDeSys, also can use c language compilation, not need special module to control.
The present invention has following beneficial effect:
By to solenoid valve output voltage, solenoid valve is replaced, open motor stroking mechanism oil supply gallery, the pressure oil provided by pioneer pump changes the discharge capacity of motor, realizes motor height low speed and switches; Intelligent control machine low speed start in high speed mode, and then automatically switch to fast mode, the immense pressure avoiding high-speed starting to bring is impacted, and improves reliability and the working life of complete machine.
Accompanying drawing explanation
Fig. 1 is running gear schematic diagram traditional in prior art.
Fig. 2 is the system block diagram of a kind of soft start running gear of the embodiment of the present invention.
Fig. 3 is the schematic diagram of a kind of soft start running gear of the embodiment of the present invention.
Embodiment
In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 2, embodiments provide a kind of soft start running gear, comprise variable displacement pump 1, metering pump 2, main relief valve 3, precursor overflow valve 5, travel control valve 4, walking selector valve 6, solenoid valve 7, ECU (Electrical Control Unit) 8, high low speed switch 9, first pressure switch 10, second pressure switch 11, running motor 13, running motor stroking mechanism 12 and fuel tank 14, the oil outlet of variable displacement pump 1 is connected with the walking import of selector valve 6, the import of main relief valve 3 respectively; The oil outlet of metering pump 2 is connected with the filler opening of precursor overflow valve 5, solenoid valve 7 and travel control valve 6 respectively; The oil outlet of travel control valve 6 is connected with control mouth a, b of walking selector valve 6 respectively, controls walking selector valve 6 and replaces; The oil outlet of solenoid valve 7 is connected with running motor stroking mechanism 12, controls motor and changes discharge capacity; The oil outlet of walking selector valve 6 is connected with filler opening A, the return opening B of motor respectively, provides work oil to motor; The return opening of walking selector valve 6, main relief valve 3, precursor overflow valve 5, travel control valve 4 and solenoid valve 7 is all connected with fuel tank 14, and variable displacement pump 1 is connected with fuel tank 14 with the inlet port of metering pump 2.
Preferably, described high low speed switch 9, for manual input switches amount signal, adopts rocker switch.
Preferably, described high low speed switch 9 adopts the key switch be integrated in display device.
Wherein, the on-off model typical hardware filtering process inputted, do not need special software module process, control program can be write based on the software environment of general industry controller such as BODAS, CoDeSys, also can use c language compilation, not need special module to control.
This concrete enforcement electric control logic, as shown in Figure 3, if user manually inputs low-speed mode, then ECU (Electrical Control Unit) does not export control signal, and motor remains on low speed huge discharge state; If user manually inputs fast mode, and pressure switch detects walk signal, then ECU (Electrical Control Unit) time delay t exports control signal after second, motor is switched to high speed small displacement state.So just achieve the low speed start under fast mode, and then automatically switch to fast mode, avoid the immense pressure impact that high-speed starting brings, if t is too short for key parameter delay time, then motor does not also accelerate to enough rotating speeds, just be switched to small displacement pattern, larger compression shock may be caused; If delay time t is long, then start-up course can be caused to jolt, affect travelling comfort.Wherein, key parameter delay time t is determined by experiment.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (3)

1. a soft start running gear, it is characterized in that, comprise variable displacement pump (1), metering pump (2), main relief valve (3), precursor overflow valve (5), travel control valve (4), walking selector valve (6), solenoid valve (7), ECU (Electrical Control Unit) (8), high low speed switch (9), first pressure switch (10), second pressure switch (11), running motor (13), running motor stroking mechanism (12) and fuel tank (14), the oil outlet of variable displacement pump (1) respectively with the import of walking selector valve (6), the import of main relief valve (3) is connected, the oil outlet of metering pump (2) is connected with the filler opening of precursor overflow valve (5), solenoid valve (7) and travel control valve (6) respectively, the oil outlet of travel control valve (6) (a, b) to be connected with the control mouth of walking selector valve (6), to control walking selector valve (6) and replace respectively, the oil outlet of solenoid valve (7) is connected with running motor stroking mechanism (12), controls motor and changes discharge capacity, the oil outlet of walking selector valve (6) is connected with filler opening A, the return opening B of motor respectively, provides work oil to motor, the return opening of walking selector valve (6), main relief valve (3), precursor overflow valve (5), travel control valve (4) and solenoid valve (7) is all connected with fuel tank (14), and variable displacement pump (1) is connected with fuel tank (14) with the inlet port of metering pump (2).
2. a kind of soft start running gear according to claim 1, is characterized in that, described high low speed switch (9), for manual input switches amount signal, adopts rocker switch.
3. a kind of soft start running gear according to claim 1, is characterized in that, the key switch that the employing of described high low speed switch (9) is integrated in display device.
CN201510387187.XA 2015-07-06 2015-07-06 A kind of soft start running gear Expired - Fee Related CN105065348B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510387187.XA CN105065348B (en) 2015-07-06 2015-07-06 A kind of soft start running gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510387187.XA CN105065348B (en) 2015-07-06 2015-07-06 A kind of soft start running gear

Publications (2)

Publication Number Publication Date
CN105065348A true CN105065348A (en) 2015-11-18
CN105065348B CN105065348B (en) 2017-10-27

Family

ID=54494819

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510387187.XA Expired - Fee Related CN105065348B (en) 2015-07-06 2015-07-06 A kind of soft start running gear

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6220028B1 (en) * 1997-12-04 2001-04-24 Hitachi Construction Machinery Co., Ltd. Hydraulic drive system for hydraulic work vehicle
CN1796667A (en) * 2004-12-31 2006-07-05 斗山英维高株式会社 Travel control device for excavators
CN101545274A (en) * 2008-03-27 2009-09-30 沃尔沃建造设备控股(瑞典)有限公司 Traveling system for construction equipment
CN104196779A (en) * 2014-08-14 2014-12-10 中国重型机械研究院股份公司 High-low speed switching hydraulic motor control device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6220028B1 (en) * 1997-12-04 2001-04-24 Hitachi Construction Machinery Co., Ltd. Hydraulic drive system for hydraulic work vehicle
CN1796667A (en) * 2004-12-31 2006-07-05 斗山英维高株式会社 Travel control device for excavators
CN101545274A (en) * 2008-03-27 2009-09-30 沃尔沃建造设备控股(瑞典)有限公司 Traveling system for construction equipment
CN104196779A (en) * 2014-08-14 2014-12-10 中国重型机械研究院股份公司 High-low speed switching hydraulic motor control device

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