WO2017122836A1 - Système hydraulique pour équipement de construction - Google Patents

Système hydraulique pour équipement de construction Download PDF

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Publication number
WO2017122836A1
WO2017122836A1 PCT/KR2016/000256 KR2016000256W WO2017122836A1 WO 2017122836 A1 WO2017122836 A1 WO 2017122836A1 KR 2016000256 W KR2016000256 W KR 2016000256W WO 2017122836 A1 WO2017122836 A1 WO 2017122836A1
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WO
WIPO (PCT)
Prior art keywords
spool
hydraulic
hydraulic pump
port
poppet
Prior art date
Application number
PCT/KR2016/000256
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English (en)
Korean (ko)
Inventor
전만석
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
전만석
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 볼보 컨스트럭션 이큅먼트 에이비, 전만석 filed Critical 볼보 컨스트럭션 이큅먼트 에이비
Priority to PCT/KR2016/000256 priority Critical patent/WO2017122836A1/fr
Publication of WO2017122836A1 publication Critical patent/WO2017122836A1/fr

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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/04—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors

Definitions

  • the present invention relates to a hydraulic system for construction machinery, and more particularly, in the case of operating an optional device selectively mounted on a construction machine, for example, an excavator, in addition to a single operation of the option device as well as a combination operation with the attachment. It relates to a hydraulic system for construction machinery that can adjust the flow rate of the working oil supplied.
  • construction machines such as excavators
  • optional devices such as breakers, hammers, shears, and the like.
  • This option device is operated by the hydraulic oil discharged from the hydraulic pump supplied.
  • a flow rate control valve is installed in the flow path between the option device and the hydraulic pump to control the flow rate of the hydraulic oil discharged from the hydraulic pump and supplied to the option device.
  • the conventional flow control valve is designed to constantly supply the hydraulic fluid discharged from the hydraulic pump to the optional device regardless of the magnitude of the load generated in the optional device.
  • the flow rate of the hydraulic oil supplied to the option apparatus is excessively increased than the set flow rate.
  • the flow rate of the excessively supplied hydraulic oil is stabilized with time.
  • the conventional flow control valve is designed to control only the independent operation of the option device, and thus has a problem such that the operation speed of the option device is lowered when combined with the attachment.
  • the present invention has been made to solve the problems of the prior art as described above, the object of the present invention when operating an optional device that is selectively mounted on a construction machine, such as an excavator, the operation of the optional device as well as attachments To provide a hydraulic system for construction machinery that can control the flow rate of the hydraulic fluid supplied to the optional device even when combined with.
  • the hydraulic pump and the optional device and the hydraulic pump and the attachment is installed in the flow path, one side and the other side is provided with a first port and a second port, respectively, the first applied to the first port 1 the flow path between the hydraulic pump and the option device when switching by the pilot signal pressure, the flow path between the hydraulic pump and the option device when switching by the second pilot signal pressure applied to the second port and the A first spool for simultaneously connecting a flow path between the hydraulic pump and the attachment;
  • a poppet installed to open and close a flow path connecting the hydraulic pump and the first spool, and controlling a flow rate of the working oil supplied from the hydraulic pump to the option device when the first spool is switched;
  • a second spool installed in a flow path connecting the first spool and the option device, and controlling a hydraulic oil supplied to the option device through the first spool during switching; And it is connected to the first spool and the poppet, it is repeatedly switched to one side or the other side according to the magnitude of the pressing force repeatedly applied to one end
  • the pressing force applied to one side end of the third spool may be a value obtained by multiplying the cross-sectional area of the one end pressure receiving unit by the hydraulic oil pressure in the flow passage communicating with the one end.
  • the pressing force applied to the other end of the third spool may be a value obtained by multiplying the cross-sectional area of the other end pressure receiving portion by the hydraulic oil pressure in the flow passage communicating with the other end and adding the elastic force of the valve spring for elastically supporting the other end.
  • a shim having a through hole formed at the inlet side of the first orifice and communicating with the first orifice, and a check valve formed in the first orifice and having a second orifice penetrated at the center thereof.
  • it may further include a piston connected to the poppet.
  • the piston may further include a third orifice which is formed in the piston and controls hydraulic fluid discharged from the hydraulic pump and supplied to the back pressure chamber of the poppet when the third spool is switched.
  • It may further include a fourth orifice installed in a flow path connecting between the third spool and the back pressure chamber of the piston, and for controlling the hydraulic oil supplied from the hydraulic pump to the back pressure chamber of the piston when the third spool is switched.
  • the inlet side is in communication with the flow path between the first spool and the poppet is installed in the flow path is connected to the outlet side to the third spool, and discharged from the hydraulic pump to control the operating oil for switching the third spool It may further include a fifth orifice.
  • the second spool includes a third port and a fourth port provided at one side and the other side, and enables the first operation of the option device when switching by the third pilot signal pressure applied to the third port, When switching by the fourth pilot signal pressure applied to the fourth port, the second operation of the option device may be enabled.
  • the apparatus may further include a first proportional control valve connected to the first port and a second proportional control valve connected to the second port.
  • the first pilot signal pressure is applied to the first port via the first proportional control valve
  • the second pilot signal pressure is applied to the second port via the second proportional control valve.
  • the flow rate of the hydraulic oil supplied to the option device can be constantly adjusted not only in the single operation of the option device but also in the combined operation with the attachment.
  • FIG. 1 is a cross-sectional view showing a flow control valve in a hydraulic system for construction machinery according to an embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram of a hydraulic system for a construction machine according to an embodiment of the present invention.
  • Figure 3 is a cross-sectional view of the poppet of the hydraulic system for construction machinery according to an embodiment of the present invention.
  • the hydraulic system for a construction machine is an optional device such as a breaker, hammer, shear, etc., which is selectively mounted on a construction machine such as an excavator through hydraulic control ( 24) Hydraulic system to control the operation.
  • a construction machine such as an excavator through hydraulic control ( 24) Hydraulic system to control the operation.
  • the hydraulic system for a construction machine according to an embodiment of the present invention, the hydraulic fluid supplied to the option device 24 at the time of combined operation with the attachment of the excavator consisting of the boom, the arm, the bucket as well as the sole operation of the option device 24 Hydraulic system that can control the flow rate.
  • the hydraulic system for a construction machine is formed including a first spool 15, poppet 14, the second spool 25 and the third spool (3).
  • the first spool 15 is discharged from the hydraulic pump 26 to operate the option device 24 and to supply the hydraulic oil to the hydraulic cylinder 37 for attachment for operating the attachment device. It is a spool that controls the movement and flow of hydraulic oil. To this end, the first spool 15 is installed in the flow path connecting the hydraulic pump 26 and the option device 24 and the hydraulic pump 26 and the attachment, more specifically the hydraulic cylinder 37 for attachment. One side of the first spool 15 is provided with a first port a to which the first pilot signal pressure is applied. In this case, the first pilot signal pressure may be applied to the first port a via the first proportional control valve 41.
  • a second port b to which the second pilot signal pressure is applied is provided on the other side of the first spool 15.
  • the second pilot signal pressure may be applied to the second port b via the second proportional control valve 42.
  • the hydraulic oil discharged from the hydraulic pump 26 is supplied to the option device 24, and some of the hydraulic oil discharged from the hydraulic pump 26 is joined to the flow path 32 And joins to the flow path of the hydraulic system for operating the attachment hydraulic cylinder 37 through.
  • the poppet 14 is installed to open and close the flow path 20 connecting the hydraulic pump 26 and the first spool 15.
  • the poppet 14 controls the flow rate of the hydraulic oil supplied from the hydraulic pump 26 to the option device 24 at the time of switching the first spool 15.
  • Hydraulic system for a construction machine further includes a piston 13 connected to the poppet 14, the piston 13 is elastically supported by the elastic member 12.
  • the hydraulic system for a construction machine piston 13 and poppet 14 by the hydraulic oil discharged from the hydraulic pump 26 by switching the third spool (3).
  • it may include a shim (14c) and a check valve (14b) acting as a control means for controlling the flow rate of the working oil passing through the first orifice (14a) of the poppet (14).
  • the shim 14c and the check valve 14b are supplied to the option device 24 from the back pressure chamber 17 of the poppet 14 by the third spool 3 switching in the initial control section of the operation of the option device 24. Prevents the flow of hydraulic oil from increasing above the set flow rate.
  • the shim 14c is seated on the inlet side of the first orifice 14a of the poppet 14.
  • the seam 14c is formed with a through hole 14e in communication with the first orifice 14a.
  • the check valve 14b is built in the first orifice 14a.
  • a second orifice 14d is formed below the check valve 14b (drawing reference).
  • the hydraulic system for construction machinery according to an embodiment of the present invention, the third orifice 13a, the fourth orifice 30a and the fifth orifice 30b to control the hydraulic oil discharged from the hydraulic pump 26.
  • the third orifice 13a is formed in the piston 13.
  • the third orifice 13a discharges from the hydraulic pump 26 when the third spool 3 is switched to control the hydraulic oil supplied to the back pressure chamber 17 of the poppet 14.
  • the fourth orifice 30a is provided in a flow path 23 connecting the third spool 3 and the back pressure chamber 29 of the piston 13.
  • the fourth orifice 30a discharges from the hydraulic pump 26 when the third spool 3 is switched to control the hydraulic oil supplied to the back pressure chamber 29 of the piston 13.
  • the fifth orifice 30b is provided in the flow path 16 through which the inlet side communicates with the flow path between the first spool 15 and the poppet 14 and the outlet side communicates with the third spool 3.
  • the fifth orifice 30b discharges from the hydraulic pump 26 to control the hydraulic oil for switching the third spool 3.
  • the second spool 25 is provided in a flow path connecting the first spool 15 and the option device 24.
  • the second spool 25 controls the hydraulic oil supplied to the option device 24 through the first spool 15 at the time of switching.
  • One side of the second spool 25 according to the embodiment of the present invention is provided with a third port c to which a third pilot signal pressure is applied for the first operation of the option device 24.
  • the first operation of the option device 20 may be an upward movement or a change of direction in the first direction.
  • the second spool 25 When the third pilot signal pressure for the first operation of the option device 24 is applied to the third port c, the second spool 25 is switched in the left direction (reference to the drawing), and from the hydraulic pump 26 In addition to connecting the flow path between the first spool 15 and the option device 24 so that the discharged hydraulic oil can move to the option device 24 via the first spool 15, the hydraulic oil from the option device 24 is connected. Is connected to the flow path between them so that it can be returned to the hydraulic tank (36). At this time, in order for the hydraulic oil discharged from the hydraulic pump 26 to move to the option device 24 via the first spool 15, the first spool 15 may also be driven by the first pilot signal pressure or the second pilot signal pressure. It must be switched.
  • the other side of the second spool 25 is provided with a fourth port d to which the fourth pilot signal pressure is applied for the second operation of the option device 24.
  • the second operation of the option device 25 may be a downward direction or a change of direction in a second direction opposite to the first direction.
  • the fourth pilot signal pressure for the second operation of the option device 25 is applied to the fourth port d, the second spool 25 is switched in the right direction (reference to the drawing), and the hydraulic pump 26
  • the hydraulic fluid discharged from the connecting device is connected to the hydraulic device by connecting the flow path therebetween so as to be movable to the option device 24 via the first spool 15.
  • the flow path between them is connected.
  • the flow path for the hydraulic oil moving to the option device 24 and the hydraulic oil return to the hydraulic tank 36 are flow paths that are opened when the second spool 25 is switched for the first operation of the option device 24. Is reversed.
  • the third spool 3 is connected with the first spool 15 and the poppet 14. At this time, the third spool 3 is repeatedly switched to one side or the other side according to the magnitude of the pressing force repeatedly applied to the left end (based on the drawing) and the right end.
  • the third spool 3 controls the hydraulic oil supplied from the hydraulic pump 26 to the poppet 14 side at the time of switching.
  • the pressing force applied to the left end of the third spool 3 is defined as a value obtained by multiplying the cross-sectional area of the left pressure receiving part by the hydraulic oil pressure in the flow path 16 in communication with the left end, and the third spool 3
  • the pressing force applied to the right end of the c) is defined as the value obtained by multiplying the cross-sectional area of the right end hydraulic part by the hydraulic oil pressure in the flow path 18 in communication with the right end and the elastic force of the valve spring 5 elastically supporting the right end. This will be described in more detail below.
  • the hydraulic oil discharged from the hydraulic pump 26 includes a flow path 20 in one direction connecting the hydraulic pump 26 and the first spool 15, and the flow path 20. It is bisected and supplied to the flow path 20a branched from the other direction from the side. At this time, the hydraulic oil supplied to the flow passage 20 in one direction is also supplied to the pilot flow passage 19 connected thereto.
  • the poppet 14 is pushed up in the upward direction (see FIG. 1) by the hydraulic oil supplied to the flow path 20 in one direction.
  • the check valve 14b embedded in the first orifice 14a of the poppet 14 is moved to the upper seam 14c position.
  • the hydraulic oil supplied to the mixing chamber 17 of the poppet 14 is moved to the chamber 21 through the second orifice 14d of the check valve 14b embedded in the poppet 14. For this reason, the poppet 14 is moved upward and comes into contact with the piston 13. At this time, the elastic member 12 is compressed. Accordingly, the hydraulic oil supplied to the flow path 20 in one direction is moved to the chamber 21. At this time, the hydraulic fluid moved to the chamber 21 is blocked by the first spool 15 that is maintained in a neutral state and is not supplied to the option device 24. In addition, the hydraulic oil of the flow path 20a branched from the flow path 20 in one direction to the other direction is returned to the hydraulic tank 36 via the second spool 25.
  • variable notch portion formed on the outer circumferential surface of the first spool 15 27, pressure loss starts to occur between the chamber 21 and the option port 22.
  • the pressure loss also increases as the flow rate of the hydraulic fluid moving from the chamber 21 to the option port 22 increases.
  • the pressure of the hydraulic oil raised by the switching of the first spool 15 passes through the fifth orifice 30b of the flow path P1 16 in communication with the chamber 21, and thus the left side of the third spool 3. Supplied to the stage. For this reason, the 3rd spool 3 is switched to a right direction.
  • the pressure receiving section cross-sectional area of the third spool 3 is A1
  • the force for switching the third spool 3 to the right direction is A1 ⁇ P1.
  • the pressure of the hydraulic oil at the option port 22 is supplied to the right end of the third spool 3 through the flow path P2 18 communicated with it.
  • the 3rd spool 3 is switched to a left direction.
  • the pressure receiving section cross-sectional area of the third spool 3 is A2
  • the force for switching the third spool 3 to the left is A2 ⁇ P2 + F1.
  • F1 is the elastic force of the valve spring 5.
  • the condition for maintaining the initial state in which the third spool 3 is not switched is A1 ⁇ P1 ⁇ A2 ⁇ P2 + F1
  • the condition for switching the third spool 3 in the right direction is A1 ⁇ P1> A2. It becomes * P2 + F1.
  • the hydraulic oil supplied to the pilot oil passage 19 communicating with the oil passage 20 in one direction connecting the hydraulic pump 26 and the first spool 15 may be After passing through the three spools 3 and the flow path 23 connecting the back pressure chamber 29 of the piston 13, they are supplied to the back pressure chamber 29 of the piston 13. Through this, the piston 13 moves in the downward direction (see FIG. 1). In this case, the poppet 14 also moves downward at the same time.
  • variable notch portion formed on the outer circumferential surface of the first spool 15 (The pressure loss starts to occur between the chamber 21 and the option port 22 by 35). In this case, the pressure loss also increases as the flow rate of the hydraulic fluid moving from the chamber 21 to the option port 22 increases.
  • the pressure of the hydraulic oil raised by the switching of the first spool 15 passes through the fifth orifice 30b of the flow path P1 16 in communication with the chamber 21, and thus the left side of the third spool 3. Supplied to the stage. For this reason, the 3rd spool 3 is switched to a right direction.
  • the pressure receiving section cross-sectional area of the third spool 3 is A1
  • the force for switching the third spool 3 to the right direction is A1 ⁇ P1.
  • the pressure of the hydraulic oil at the option port 22 is supplied to the right end of the third spool 3 through the flow path P2 18 communicated with it.
  • the 3rd spool 3 is switched to a left direction.
  • the pressure receiving section cross-sectional area of the third spool 3 is A2
  • the force for switching the third spool 3 to the left is A2 ⁇ P2 + F1.
  • F1 is the elastic force of the valve spring 5.
  • the condition for maintaining the initial state in which the third spool 3 is not switched is A1 ⁇ P1 ⁇ A2 ⁇ P2 + F1
  • the condition for switching the third spool 3 in the right direction is A1 ⁇ P1> A2. It becomes * P2 + F1.
  • the second pilot signal pressure is applied to the second port b of the first spool 15 and the first spool 15 is switched in the left direction (reference to the drawing), it is moved to the chamber 21.
  • the hydraulic oil is supplied to the option device 24 through the option port 22, and some of the hydraulic oil discharged from the hydraulic pump 26 and supplied to the flow path 20 in one direction is upwardly loaded with the rod check poppet 38. While waiting in the chamber 31 in the upward direction, it passes through the notch part 33 and the joining flow path 32 and is supplied to the attachment hydraulic cylinder 37 side.
  • the hydraulic system for construction machinery contributes to the improvement of the operation speed of the attachment not only during the independent operation of the option device 24 but also during the combined operation with the attachment.
  • the flow rate of the hydraulic oil supplied can be adjusted constantly.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

La présente invention concerne un système hydraulique pour équipement de construction, le système comprenant : une première bobine installée sur un canal fluidique qui relie une pompe hydraulique et un dispositif optionnel et relie la pompe hydraulique et un accessoire, la première bobine ayant des premier et second orifices prévus sur les côtés opposés de celle-ci, respectivement; la première bobine relie le canal fluidique entre la pompe hydraulique et le dispositif optionnel lorsqu'elle est commutée par une première pression de signal pilote appliquée au premier orifice, et relie simultanément le canal fluidique entre la pompe hydraulique et le dispositif optionnel et le canal fluidique entre la pompe hydraulique et l'accessoire lorsqu'elle est commutée par une seconde pression de signal pilote appliquée au second orifice; un clapet installé pour ouvrir/fermer un canal fluidique reliant la pompe hydraulique et la première bobine, lequel clapet commande la quantité d'huile hydraulique fournie par la pompe hydraulique vers le dispositif optionnel lorsque la première bobine est commutée; une seconde bobine installée sur un canal fluidique reliant la première bobine et le dispositif optionnel, la seconde bobine commandant une huile hydraulique fournie au dispositif optionnel à travers la première bobine lorsqu'elle est commutée; et une troisième bobine reliée à la première bobine et au clapet, laquelle troisième bobine est commutée de manière répétitive à un côté ou un côté opposé en fonction de l'amplitude de pression appliquée de façon répétée à ses extrémités opposées, et commande une huile hydraulique fournie par la pompe hydraulique au clapet lorsqu'elle est commutée.
PCT/KR2016/000256 2016-01-11 2016-01-11 Système hydraulique pour équipement de construction WO2017122836A1 (fr)

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PCT/KR2016/000256 WO2017122836A1 (fr) 2016-01-11 2016-01-11 Système hydraulique pour équipement de construction

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Application Number Priority Date Filing Date Title
PCT/KR2016/000256 WO2017122836A1 (fr) 2016-01-11 2016-01-11 Système hydraulique pour équipement de construction

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002106507A (ja) * 2000-07-27 2002-04-10 Komatsu Ltd 液圧アクチュエータの流量制御装置
JP2007315514A (ja) * 2006-05-26 2007-12-06 Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd 作業機械の制御装置
KR100800081B1 (ko) * 2006-08-29 2008-02-01 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 굴삭기용 옵션장치의 유압회로
WO2013002429A1 (fr) * 2011-06-27 2013-01-03 볼보 컨스트럭션 이큅먼트 에이비 Clapet de commande hydraulique pour matériel de construction
KR20150114949A (ko) * 2013-02-05 2015-10-13 볼보 컨스트럭션 이큅먼트 에이비 건설기계의 압력 제어밸브

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002106507A (ja) * 2000-07-27 2002-04-10 Komatsu Ltd 液圧アクチュエータの流量制御装置
JP2007315514A (ja) * 2006-05-26 2007-12-06 Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd 作業機械の制御装置
KR100800081B1 (ko) * 2006-08-29 2008-02-01 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 굴삭기용 옵션장치의 유압회로
WO2013002429A1 (fr) * 2011-06-27 2013-01-03 볼보 컨스트럭션 이큅먼트 에이비 Clapet de commande hydraulique pour matériel de construction
KR20150114949A (ko) * 2013-02-05 2015-10-13 볼보 컨스트럭션 이큅먼트 에이비 건설기계의 압력 제어밸브

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