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WO2001092651A1 - Circuit hydraulique et procede d'entrainement d'urgence de fixation pour machines de construction - Google Patents

Circuit hydraulique et procede d'entrainement d'urgence de fixation pour machines de construction Download PDF

Info

Publication number
WO2001092651A1
WO2001092651A1 PCT/JP2001/004625 JP0104625W WO0192651A1 WO 2001092651 A1 WO2001092651 A1 WO 2001092651A1 JP 0104625 W JP0104625 W JP 0104625W WO 0192651 A1 WO0192651 A1 WO 0192651A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic
pilot
pressure
control valve
oil
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.)
Ceased
Application number
PCT/JP2001/004625
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Onoue
Yasushi Tanaka
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.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to EP01934472A priority Critical patent/EP1300519B1/fr
Priority to DE60143698T priority patent/DE60143698D1/de
Publication of WO2001092651A1 publication Critical patent/WO2001092651A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2282—Systems using center bypass type changeover valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems

Definitions

  • the present invention relates to a hydraulic circuit of a construction machine that drives a front attachment driving actuator using a hydraulic pilot control valve, and an attachment emergency driving method.
  • the front attachment In a construction machine that operates a front attachment by driving a hydraulic cylinder with oil discharged from a hydraulic pump, the front attachment may be inoperable with a hollow and stopped due to a failure of the engine that drives the hydraulic pump. For safety reasons, it is not advisable to leave the attachment suspended in the air, so the attachment must be lowered to the ground by some means.
  • a hydraulic cylinder-type control valve is used to drive a brake cylinder.
  • a bypass line is provided to allow communication between the cylinder chamber of the boom cylinder and the hydraulic pipe line, and a manual switching valve is interposed in this bypass line. If the changeover valve is manually switched when the front cutter including the boom stops in a hollow state, the pressure in the cylinder chamber of the cylinder (pressure by the attachment's own weight) will flow to the pilot line via the bypass line. Be guided. The pressure acts on the pilot port of the control valve to switch the control valve to the boom lower position. As a result, the cylinder chamber communicates with the tank via the control valve, and the boom descends by its own weight.
  • An object of the present invention is to provide a hydraulic circuit for a construction machine that can safely drive an emergency front attachment with a very simple configuration.
  • the present invention relates to a hydraulic pump driven by an engine, an actuator driven by a discharge oil of the hydraulic pump to drive a front attachment, and a hydraulic oil pump, which is switched by a pilot oil pressure to flow the hydraulic oil into the actuator. It is applied to the hydraulic circuit of construction machinery equipped with a hydraulic pilot control valve that controls outflow.
  • a hydraulic oil injection port to which a manual hydraulic pump (hydraulic power source) can be connected is provided in the pilot pipe that guides the pilot hydraulic pressure to the control valve. This allows the control valve to be switched by supplying pressure oil to the pipeline pipe.
  • the front attachment includes a boom, and a pressure oil injection port be provided in a pipe line on the lower side of the boom.
  • the pressure oil injection port be provided at a position off the movement locus of the front attachment.
  • a grease gun that is normally provided as a maintenance and inspection tool for construction machinery may be used.
  • the present invention is also applied to an emergency driving method for an attachment of a construction machine.
  • the emergency pilot oil pressure is generated using a manual dolly gun or the like in the pipe line that guides the pilot oil pressure to the control valve, and the pressure oil is used to switch the control valve to operate the actuator. Drive the attachment.
  • FIG. 1 is a side view showing a hydraulic shovel equipped with a hydraulic circuit according to a first embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram for driving the boom of the excavator.
  • FIG. 3 is a diagram showing a configuration of a grease gun.
  • FIG. 4 is a perspective view showing a hydraulic excavator according to the second embodiment.
  • FIG. 5 is a plan view of the excavator of FIG.
  • FIG. 6 is a hydraulic circuit diagram for driving the boom of the hydraulic excavator of FIG.
  • FIG. 7 is a diagram showing a movement locus of a front attachment of the excavator in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 shows a hydraulic shovel according to the present embodiment.
  • the front attachment FA connected to the upper revolving superstructure comprises a boom 2 driven by a boom cylinder 1, an arm 4 driven by an arm cylinder 3, and a bucket 6 driven by a bucket cylinder 5.
  • FIG. 2 shows a hydraulic circuit for driving the boom of the excavator.
  • a hydraulic pilot control pulp 12 is provided between a hydraulic pump 11 driven by an engine (not shown) and a boom cylinder 1.
  • the flow rate and direction of the pressure oil flowing into and out of the boom cylinder 1 are controlled by switching the control valve 12.
  • the control valve 12 is switched by the pilot hydraulic pressure of the pilot hydraulic circuit 20.
  • the pilot hydraulic circuit 20 includes a pilot hydraulic pump 21, pilot valves (pressure reducing valves) 22 a and 22 b for reducing the discharge pressure of the pilot hydraulic pump 21, and a pilot valve 2.
  • Pilot lines 23a and 23b are provided to guide the secondary pressures 2a and 22b to pilot ports 12a and 12b of the control valve 12.
  • the pilot valves 22a and 22b are operated by operating levers 22c provided in the cab.
  • a pipe 23 Valve 24 (open / close valve) is interposed.
  • the pipe upstream of the stop valve 24 is 23 bU, and the pipe downstream is 23 bL.
  • a hydraulic oil injection port 25 provided in a pipeline 23 bL downstream of the stop valve 24 is provided with an oil pressure coupling 26.
  • the pressurized oil injection port 25 is provided at a position (for example, the lower part of the cabin) deviated from the movement trajectory of the front attachment FA in consideration of the ease of injection of the pressurized oil and safety. Normally, since the stop valve 24 is in the open state and the hydraulic oil injection port 25 is closed by the hydraulic coupling 26, the secondary pressure of the pilot valve 22b can be safely applied to the pilot port 12b. Works.
  • a grease gun 30 as shown in FIG. 3 is used.
  • the grease gun 30 is provided as standard equipment on a hydraulic excavator to replenish grease to the joints of the front attachment FA.
  • it is used as a manual hydraulic pump (hydraulic power source) for supplying pressure oil. The procedure and operation will be described later.
  • the operator grounds the packet 6 in the following procedure.
  • the stop valve 2 in the boom lowering pipe line 23b is closed to prevent the pressurized oil from flowing into the pipe 23bU on the pilot valve 22b side.
  • Pressure oil is injected from the injection port 25 using the grease gun 30 described above.
  • a grease gun 30 is loaded with a hydraulic cartridge filled with hydraulic oil in place of the cartridge filled with Dalice, and a hydraulic coupling provided at the end of the hose 31 (Fig. 3) of the grease gun 30 3 2 is connected to the hydraulic coupling 26 on the injection port 25 side.
  • the pressure oil injection port 25 in the pilot pipe 23 bL it is only necessary to provide the pressure oil injection port 25 in the pilot pipe 23 bL, and the cost can be reduced as compared with the conventional method.
  • the switching amount of the control valve 12 can be adjusted depending on the degree of pressure oil injection, the descent speed of the boom can be freely controlled.
  • the pressurized oil injection port 25 is provided at a position deviating from the movement trajectory of the front attachment FA, the safety is excellent.
  • FIGS. An embodiment in which the present invention is applied to an offset type excavator will be described with reference to FIGS. Note that members having the same role as in the first embodiment are denoted by reference numerals in the 100's, and the last two digits are the same as those described above.
  • a cabin 51, an engine 52, a hydraulic pump 111, a control valve unit VU, etc. are mounted on the upper swing body of the excavator. Further, a front attachment F A ′ is connected to the right side of the upper revolving unit in the figure.
  • the boom 102 consists of a proximal end 102 A and a distal end 102 B and has an offset series.
  • the distal end 102B rotates with respect to the proximal end 102A as shown in FIG.
  • the cylinder stay 62 which is rotatably connected to the distal end portion 102B, moves left and right while rotating parallel to the base end portion 102A by the rotation of the front end portion 102B. Then, the arm 104 and the bucket 106 connected to the tip thereof are offset right and left on the body. Therefore, it is possible to dig a gutter on the ground beside the excavator.
  • FIG. 6 shows a hydraulic circuit for driving a boom of a hydraulic shovel according to a second embodiment.
  • the difference from FIG. 2 is that the pilot ports 1 2 3 a and 1 2 3 b are connected to the pilot port 1 1 2 a, This is the point connected to 1 1 2 b.
  • the solenoid valve unit 70 is arranged below the cap 51 as shown in FIG.
  • the solenoid valve unit is not limited to the boom cylinder 101, and the pilot lines for driving the actuators such as the offset cylinder 61, the arm cylinder 103, and the bucket cylinder 105 are also provided. Via 70, it is connected to the control valve pipe port corresponding to each factory. Therefore, the solenoid valve unit 70 has a plurality of ports (input and output ports) to which each pipeline is connected. By changing the port to which each pipeline is connected, the pilot pipeline for each actuator can be rearranged. This is widely used to respond to the characteristics of the operator's driving operation, such as when operating multiple actuators with one operating valve. In the present embodiment, a force coupling or the like is provided in the port of the solenoid valve unit 70 so that the above-described grease gas can be connected, and the port is used as a pressure oil injection port in an emergency.
  • the operator performs a manual boom lowering operation. Whether the boom 102 is to be lowered forward or backward depends on the attitude of the front desk installation FA. If the center of gravity of the front attachment F A, is located forward of the boom rotation axis, it is lowered forward, and if it is located behind it, it is lowered rearward.
  • the boom 102 rotates in the angle range shown in FIG. 7, but the position of the left side of the cabin 51 where the solenoid valve unit 70 is arranged is completely determined from the movement trajectory of the front attachment FA '. Is off. Therefore, regardless of the offset state of the attachment FA 'and the rotation angles of the boom 102 and the arm 104, the attachment F A' does not pass near the solenoid valve unit 70. Therefore, the above-mentioned boom lowering operation can be safely performed on the solenoid valve unit 70.
  • the boom lowering operation can also be achieved by, for example, draining the pressurized oil from an over-opening relief valve (not shown) arranged in the entrance / exit line of the boom cylinder 101.
  • the over-the-mouth relief valve is integrated with the control valve 102 that constitutes the control valve unit VU, so the pressurized oil draining work is performed on the control valve unit VU.
  • the control pulp unit VU is provided on the right side of the cabin 51 as can be seen from FIG. 4, and when the front attachment FA 'is offset right as shown in FIG. The vicinity of the unit VU is within the movement trajectory of the front attachment FA. Therefore, the boom lowering work for the control valve unit VU has a safety problem.
  • the attachment to be driven manually is not limited to the boom, but may be any other attachment that needs to be moved in an emergency.
  • Construction machinery It is not limited to a hydraulic excavator.
  • the pressurized oil is injected using a grease gun, another manual hydraulic pump may be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning In General (AREA)

Abstract

La présente invention concerne un circuit hydraulique destiné à des machines de construction, comprenant une soupape de commande commandée par pilote hydraulique, destinée à commander une élément d'actionnement servant à entraîner une fixation frontale, et une conduite pilote servant à acheminer une pression pilote hydraulique jusqu'à la soupape de commande présentant un orifice d'entrée d'huile pressurisée permettant à une pompe hydraulique manuelle d'être connectée à ladite conduite. Selon l'invention, l'huile pressurisée est introduite dans la conduite pilote par l'orifice grâce à la pompe hydraulique manuelle de manière à faire basculer la soupape de commande, la fixation frontale pouvant être entraînée, en cas d'urgence, uniquement grâce à l'apport d'une très simple amélioration qui ne nécessite plus la présence d'une conduite de dérivation et d'une soupape de sélection.
PCT/JP2001/004625 2000-05-31 2001-05-31 Circuit hydraulique et procede d'entrainement d'urgence de fixation pour machines de construction Ceased WO2001092651A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01934472A EP1300519B1 (fr) 2000-05-31 2001-05-31 Machine de construction avec un circuit hydraulique et procédé d'entrainement d'urgence d'un équipement.
DE60143698T DE60143698D1 (de) 2000-05-31 2001-05-31 Baumaschine mit einem hydraulischen kreislauf und notbetriebsverfahren eines anbaugerätes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000-161468 2000-05-31
JP2000161468A JP2001336177A (ja) 2000-05-31 2000-05-31 建設機械の油圧回路およびアタッチメント緊急駆動方法

Publications (1)

Publication Number Publication Date
WO2001092651A1 true WO2001092651A1 (fr) 2001-12-06

Family

ID=18665488

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/004625 Ceased WO2001092651A1 (fr) 2000-05-31 2001-05-31 Circuit hydraulique et procede d'entrainement d'urgence de fixation pour machines de construction

Country Status (4)

Country Link
EP (1) EP1300519B1 (fr)
JP (1) JP2001336177A (fr)
DE (1) DE60143698D1 (fr)
WO (1) WO2001092651A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7464493B2 (en) 2004-09-10 2008-12-16 Hitachi Construction Machinery Co., Ltd. Work machine
WO2025063195A1 (fr) * 2023-09-20 2025-03-27 日立建機株式会社 Machine de travail

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011226104A (ja) * 2010-04-16 2011-11-10 Hitachi Constr Mach Co Ltd 長尺フロントの動力異常停止時降下装置と降下方法
US9085873B2 (en) 2011-12-23 2015-07-21 Caterpillar Inc. Hydraulic system for controlling a work implement
US9708796B2 (en) 2014-09-25 2017-07-18 Cnh Industrial America Llc Hydraulic valve
US9790964B2 (en) 2014-09-25 2017-10-17 Cnh Industrial America Llc Hydraulic system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5976659A (ja) 1982-10-25 1984-05-01 Nippon Kokan Kk <Nkk> 地金洗浄用バ−ナ−
JPH0693630A (ja) 1992-09-11 1994-04-05 Hitachi Constr Mach Co Ltd 作業機用バケット制御装置
JPH0617885Y2 (ja) * 1987-04-14 1994-05-11 セイレイ工業株式会社 バツクホ−における作業機の降下に対する安全装置
JPH07317713A (ja) * 1994-05-27 1995-12-08 Yutani Heavy Ind Ltd 建設機械の油圧回路
JP2000096631A (ja) * 1998-09-18 2000-04-04 Hitachi Constr Mach Co Ltd 油圧ショベルの油圧回路

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5976659A (ja) 1982-10-25 1984-05-01 Nippon Kokan Kk <Nkk> 地金洗浄用バ−ナ−
JPH0617885Y2 (ja) * 1987-04-14 1994-05-11 セイレイ工業株式会社 バツクホ−における作業機の降下に対する安全装置
JPH0693630A (ja) 1992-09-11 1994-04-05 Hitachi Constr Mach Co Ltd 作業機用バケット制御装置
JPH07317713A (ja) * 1994-05-27 1995-12-08 Yutani Heavy Ind Ltd 建設機械の油圧回路
JP2000096631A (ja) * 1998-09-18 2000-04-04 Hitachi Constr Mach Co Ltd 油圧ショベルの油圧回路

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1300519A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7464493B2 (en) 2004-09-10 2008-12-16 Hitachi Construction Machinery Co., Ltd. Work machine
WO2025063195A1 (fr) * 2023-09-20 2025-03-27 日立建機株式会社 Machine de travail

Also Published As

Publication number Publication date
JP2001336177A (ja) 2001-12-07
DE60143698D1 (de) 2011-02-03
EP1300519B1 (fr) 2010-12-22
EP1300519A4 (fr) 2009-03-11
EP1300519A9 (fr) 2003-08-06
EP1300519A1 (fr) 2003-04-09

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