WO2016140378A1 - Engin de chantier comprenant une fonction d'arrêt d'urgence - Google Patents

Engin de chantier comprenant une fonction d'arrêt d'urgence Download PDF

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Publication number
WO2016140378A1
WO2016140378A1 PCT/KR2015/002005 KR2015002005W WO2016140378A1 WO 2016140378 A1 WO2016140378 A1 WO 2016140378A1 KR 2015002005 W KR2015002005 W KR 2015002005W WO 2016140378 A1 WO2016140378 A1 WO 2016140378A1
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WO
WIPO (PCT)
Prior art keywords
pressure
flow path
control valve
return flow
pressure sensor
Prior art date
Application number
PCT/KR2015/002005
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English (en)
Korean (ko)
Inventor
지세립
이춘한
신흥주
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
지세립
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, 지세립 filed Critical 볼보 컨스트럭션 이큅먼트 에이비
Priority to PCT/KR2015/002005 priority Critical patent/WO2016140378A1/fr
Publication of WO2016140378A1 publication Critical patent/WO2016140378A1/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
    • 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
    • E02F9/24—Safety devices, e.g. for preventing overload

Definitions

  • the present disclosure relates to construction machinery, and in particular, to construction machinery such as excavators, loaders, etc., which have work tools such as pours or arms.
  • Construction machines such as excavators and loaders are used for various purposes, such as excavation, digging, excavation, excavation, digging, digging of buildings, and ground stopping.
  • the construction machine is equipped with a work device such as a boom and an arm driven by hydraulic pressure. That is, when oil is supplied to the boolean actuator and the arm actuator by the hydraulic pump, the boolean and the arm are driven to perform work.
  • a construction machine includes a hydraulic pump 1 driven by an engine, and a work device actuator 2 is provided to receive hydraulic oil from the hydraulic pump 1.
  • the main control valve MCV 3 is installed between the hydraulic pump 1 and the actuator 2.
  • the operator of the construction machine operates the remote control valve 4 using the joystick 5, and the remote control valve 4 applies the signal pressure to both ends of the spool of the main control valve 3 according to this operation.
  • the control valve 3 is controlled.
  • construction machinery sometimes exhibits abnormal behavior.
  • This abnormal operation means that the working devices operate regardless of the driver's intention or the driver's operation, as opposed to the normal construction machine. Such abnormal operation may damage parts of construction machinery.
  • Korean Patent Publication No. 10-1998-0086021 is also a related patent. Looking at the contents of this patent, there is disclosed a malfunction preventing device for a hydraulic construction machine comprising a prime mover, a hydraulic pump and a pilot pump, a pressure detecting means, and a solenoid valve for controlling the pilot signal pressure.
  • the above patent merely blocks the pilot signal pressure when the pilot signal pressure is sensed even though the remote control valve is not operated.
  • the main control may not be operated due to the spool pinching of the main control valve and the inflow of foreign substances.
  • abnormal operation of the construction machine continues even if the pilot signal pressure is blocked. This is also true even if the engine is stopped or the supply path is shut off according to the conventional method.
  • the present disclosure provides a construction machine that detects a malfunction that cannot be controlled only by the operation of the remote control valve due to spool pinching and inflow of foreign substances as well as a malfunction according to the pilot signal pressure of the remote control valve.
  • the construction machine includes a main pump and a pilot pump driven by an engine, and an actuator for a work device driven by hydraulic oil supplied from the main pump.
  • a main control valve is installed in the flow path between the main pump and the actuator, and has a remote control valve for controlling the main control valve by receiving a driver's operation and applying a signal pressure from the pilot pump to both ends of the spool of the main control valve.
  • a hydraulic oil pressure sensor is installed in the supply flow path between the main pump and the main control valve, and a pressure sensor is installed in the pilot flow path between the remote control valve and the main control valve to sense the pressure in the pilot flow path. do.
  • the return flow path between the main control valve and the working oil tank is provided with a return flow path opening and closing part, which has an initial state of closing the return flow path and is supplied with power when the construction machine is started.
  • the flow path is switched to the open state.
  • the return flow opening and closing part which is maintained in the open state does not have a driver's operation, so when the pressure higher than the set pressure is not detected by the signal pressure sensor, but the pressure change is detected by the hydraulic pressure sensor, the return flow path is closed. The switching stops the actuator.
  • a controller may be provided. That is, the controller is electrically connected to the hydraulic oil pressure signal and the signal pressure pressure sensor, and opens the return flow path only when a pressure change is detected at the hydraulic oil pressure sensor and at the same time a pressure above the set pressure is also detected at the signal pressure pressure sensor. Supply power to maintain. On the other hand, there is no operator's operation, the pressure above the set pressure is not detected in the signal pressure sensor, but the hydraulic pressure sensor determines that the pressure change is detected as abnormal operation, and shuts off the power supply applied to the opening and closing part by return flow.
  • the return flow path opening and closing portion is provided in the return flow path and is elastically biased in a state of closing the return flow path, and when a signal pressure is applied to the hydraulic pressure section, the check valve is switched to a state of opening the return flow path from the controller and the controller. It consists of a solenoid valve that applies pilot pressure to this check valve when power is supplied.
  • the equipment that is, the actuator can be maintained in a stopped state.
  • the main control valve can continue to operate for various reasons such as spool pinching and foreign matter inflow.
  • pressure above the set pressure is not detected by the signal pressure sensor, but the pressure change is detected by the hydraulic oil pressure sensor because the equipment continues to operate.
  • the controller judges this state as abnormal operation, closes the return flow path by cutting off the power supply applied to the return flow opening and closing part. This causes the equipment to make an emergency stop.
  • the construction machine equipped with the emergency stop function as described above distinguishes between normal operation and abnormal operation, detects abnormal operation, and directly blocks the return flow path of the actuator of the work device such as boolean and arm. Therefore, even though the remote control valve is not operated due to the spool pinching of the main control valve (MCV) and the inflow of foreign substances, the main control valve can not be returned to neutral and can be emergency stopped. In addition, it is possible to emergency stop the construction machine even in the case of abnormal operation that occurs separately from the remote control valve, such as when the buoy or the arm descends due to its weight.
  • MCV main control valve
  • 1 is a hydraulic circuit diagram of a conventional construction machine.
  • FIG. 2 is a hydraulic circuit diagram of an emergency stop system according to an embodiment of the present invention when the construction machine starts off.
  • FIG. 3 is a hydraulic circuit diagram of the emergency stop system according to an embodiment of the present invention when the construction machine is in normal operation.
  • FIG. 4 is a hydraulic circuit diagram of an emergency stop system according to an embodiment of the present invention during an emergency stop.
  • FIG. 5 is a hydraulic circuit diagram of an emergency stop system according to another embodiment of the present invention during an emergency stop.
  • a construction machine having an emergency stop function includes a main pump 1 and a pilot pump 11 driven by an engine, and include a main pump ( An actuator 2 for a work device driven by hydraulic oil supplied from 1) is provided.
  • a main control valve 3 is installed in the flow path between the main pump 1 and the actuator 2, and the signal pressure from the pilot pump 11 is received by the driver's operation and the spool of the main control valve 3 is provided. It is provided with the remote control valve 4 which controls the main control valve 3 by applying to both ends.
  • a hydraulic oil pressure sensor 8 is installed to sense the pressure in the supply passage 21, and the remote control valve 4 and the main control are provided.
  • the pilot flow passage 23 between the valves 3 is provided with a signal pressure pressure sensor 9 to sense the pressure in the pilot flow passage 23.
  • the return flow path 22 between the main control valve 3 and the hydraulic tank T is provided with return flow path opening and closing portions 12 and 13, which are the initial state of closing the return flow path 22.
  • the return flow path 22 When the start of the construction machine is turned on and receives the power is switched to open the return flow path (22).
  • the return flow path 22 When the return flow path 22 is opened, the hydraulic oil can be returned from the actuator 2 to the hydraulic tank T.
  • the return flow path opening and closing portions 12 and 13 maintained in this open state do not have a driver's operation, and thus the pressure higher than the set pressure is not sensed by the signal pressure pressure sensor 9, but the pressure change is caused by the hydraulic pressure pressure sensor 8.
  • the operation of the actuator 2 When it is detected, the operation of the actuator 2 is stopped by switching to the state of closing the return flow path.
  • the return flow path 22 When the return flow path 22 is closed, the hydraulic fluid is not returned to the hydraulic tank T, and the actuator 2 stops operation.
  • the arm is also stationary.
  • a controller 6 may be provided. That is, the controller 6 is electrically connected to the hydraulic oil pressure sensor 8 and the signal pressure pressure sensor 9, and at the same time the pressure change is detected by the hydraulic oil pressure sensor 8, the controller 6 is also set at the signal pressure pressure sensor 9. Power is supplied to keep the return flow path 22 open only when a pressure above the pressure is sensed. On the other hand, since there is no driver's operation, the pressure higher than the set pressure is not detected by the signal pressure pressure sensor 9, but the hydraulic oil pressure sensor 8 determines that the pressure change is detected as abnormal operation, and the return flow path opening and closing portion 13 Cut off the power supply.
  • Judgment on abnormal operation requires pressure to move the main control valve 3 in the neutral state in either direction, and this pressure is generated using the signal pressure controlled by the remote control valve 4. I use it. Even when the remote control valve 4 is in a neutral state, since the pilot flow path 23 is subjected to a constant pressure, a pressure stronger than the pressure in the neutral state is generated in one direction so that the main control valve 3 can be moved. In order to increase the signal pressure in either direction, the driver operates the joystick 5 in the a direction or the b direction, and thus the signal pressure of the remote control valve 4 moves corresponding to the joystick 5. . Therefore, when the pressure value in the neutral state is previously input to the controller 6 and sensed below the set pressure, it is possible to determine that the driver operating means such as the joystick 5 is in the non-operational state.
  • the judgment on the hydraulic oil pressure sensor 8 also uses the operating principle of the construction machine. If the actuator 2 is stopped in the construction machine, since the supply passage 21 is connected to the tank by the spool, the pressure is not sensed. However, when the pressure is detected by the signal pressure pressure sensor 9 by the signal pressure generated by the driver's operation and the spool switching of the main control valve 3 occurs and the hydraulic oil is supplied from the main pump 1, the supply flow path 21 ) Pressure rises or falls. Therefore, when a change in pressure is detected by the hydraulic oil pressure sensor 8, it can be seen that the actuator 2 is not in a stopped state, and that the pour or arm is moving through the fact that the actuator 2 is not in a stopped state. have.
  • the driver operating means such as the joystick 5 may be neutral or actuator.
  • the abnormal state in which (2) is being driven can be grasped. If it is determined that the abnormal operation, the return flow path is closed by closing the power supply applied to the return flow opening and closing unit.
  • the feedback flow path opening and closing portions 12 and 13 apply a pilot pressure to the check valve 12 installed in the feedback flow path 22 and the check valve 12 when power is supplied from the controller 6. It includes a solenoid valve 13 to.
  • the check valve 12 is elastically biased in a state in which the return flow passage 22 is closed, and when the pilot pressure is applied to the hydraulic pressure portion, the check valve 12 opens the return flow passage 22.
  • the check valve 12 Since the check valve 12 is closed in the direction in which the hydraulic oil is drained from the actuator 2 toward the hydraulic tank T, the hydraulic oil returned through the return passage 22 cannot pass through the check valve 12. However, when the pilot pressure is supplied to the check valve 12 through the pilot passage 24, the check valve 12 opens the return passage 22. This is because the pilot pressure generated through the pilot pump 11 is applied to the hydraulic pressure portion of the check valve 12. Due to this pressure, the check valve 12 opens the return flow passage 22 and the working oil can be returned to the hydraulic tank T.
  • the solenoid valve 13 is installed in the pilot passage 24 between the pilot pump 11 and the check valve 12 to selectively pilot the hydraulic portion of the check valve 12 Supply pressure.
  • the solenoid valve 13 is controlled by the controller 6, and the solenoid valve 13 supplied with power from the controller 6 is pilot path 24 from the pilot pump 11 to the check valve 12 as shown in FIG. To communicate.
  • the solenoid valve 13 returns to the state of FIG. 4, and the pilot pressure, which is caught in the hydraulic pressure part of the check valve 12, is drained to the hydraulic tank T, and the return flow path 22 is closed.
  • the return flow path opening and closing portion 12, 13 has an initial state of closing the return flow path, it is possible to maintain the equipment, that is, the actuator (2) stopped.
  • the equipment that is, the actuator (2) stopped.
  • the return flow path 22 is opened, the construction machine is operating normally.
  • the controller 6 determines that the state is abnormal and the solenoid valve ( 13) Close the return flow path by cutting off the power supply. This causes the equipment to make an emergency stop.
  • Reference numeral 7 denotes a main relief valve.
  • FIG. 5 shows an example of a construction machine having an electric joystick 45 that outputs an electric control signal in accordance with a driver's manipulation amount by substituting a remote control valve as a second embodiment. Since the configuration of the main pump 1, the pilot pump 11 and the main control valve 3 is the same as the above-described embodiment of the present invention, a detailed description thereof will be omitted.
  • a hydraulic oil pressure sensor 8 is installed in the supply passage 21 between the main pump 1 and the main control valve 3, to sense the pressure in the supply passage 21.
  • the actuator 2 the controller 6, the return flow opening and closing portions 12 and 13, and the main relief valve 7 are also provided, and the configuration and effect thereof are similar to those in the first embodiment. Omit.
  • the second embodiment is a construction machine having an electric joystick 45, and as shown in FIG. 5, unlike the first embodiment above, no signal pressure pressure sensor is required. This is because the ECU included in the controller 6 recognizes whether the joystick 45 is operated as an electrical signal directly. Operation of the electric joystick 45 generates an electrical signal, which is input to the controller 6 via a controller area network (CAN) communication line 41. In addition, the controller 6 receiving the signal outputs a signal for controlling the spool switching by moving the main control valve 3.
  • CAN controller area network
  • the controller 6 analyzes and compares the signal coming from the electric joystick 45 through the CAN communication line 41 and the signal coming through the oil pressure sensor 8 to compare normal operation and abnormal operation. Will be distinguished.
  • the controller 6 determines that the driver is not operating the joystick 45, and when the pressure change is detected by the hydraulic oil pressure sensor 8, the actuator 2 It is determined that it is not stopped. On the other hand, when the controller 6 detects a pressure change in the hydraulic pressure sensor 8 and at the same time an input signal is detected from the electric joystick 45, the controller 6 determines that the operation state is normal and maintains the return flow path 22 in an open state. The return flow path supplies power to the switch.
  • the return passage opening and closing portions 12 and 13 are provided with a check valve 12 installed in the return passage 22 and the power supply when the check valve 12 is supplied. It may be configured to include a solenoid valve 13 for applying a pilot pressure to.
  • FIG. 3 is a hydraulic circuit diagram of an emergency stop system according to embodiments of the present invention when the construction machine is in normal operation.
  • the construction machine using the emergency stop system according to the present invention is to start by pressing the start switch 30, accordingly, the controller 6 controls the solenoid valve 13 to the pilot pump 11 ) To supply the pilot pressure to the check valve 12 through the pilot flow passage 24. Due to the hydraulic pressure supplied in this way, the check valve 12 is opened, and a normal operating state in which the return flow rate from the actuator 2 can be drained to the hydraulic tank T along the return flow path 22 is maintained.
  • the solenoid valve 13 cuts off the pilot pressure supplied from the pilot pump 11 to the check valve 12.
  • the pilot pressure is cut off, the hydraulic pressure required to open the check valve 12 disappears, and the check valve 12 closes the return flow path 22.
  • the passage returned from the actuator 2 to the hydraulic tank T is blocked, and the construction machine remains just before the emergency stop system is operated.
  • a hydraulic pressure pressure sensor 8 for sensing the pressure in the supply passage 14 and a signal pressure pressure for detecting the pressure in the pilot passage 23.
  • the sensor 9 is used.
  • the hydraulic oil pressure sensor 8 determines whether there is a change in pressure
  • the signal pressure pressure sensor 9 determines whether pressure above the set pressure is detected.
  • the construction machine with an emergency stop function according to the present invention can emergency stop the construction machine even in the case of abnormal operation that was not possible to cope with the conventional emergency stop system.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

La présente invention comporte une pompe principale, une pompe pilote, un actionneur pour un dispositif de travail, une soupape de commande principale, une soupape de commande à distance, un capteur de pression d'huile de travail et un capteur de pression de signal. En outre, l'invention concerne une partie d'ouverture et de fermeture de trajet d'écoulement de retour, la partie d'ouverture et de fermeture de trajet d'écoulement de retour ayant un état initial pour fermer le trajet d'écoulement de retour, qui est commutée dans un état d'ouverture du trajet d'écoulement de retour en recevant de l'énergie lorsqu'un engin de chantier est mis en marche.
PCT/KR2015/002005 2015-03-02 2015-03-02 Engin de chantier comprenant une fonction d'arrêt d'urgence WO2016140378A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2015/002005 WO2016140378A1 (fr) 2015-03-02 2015-03-02 Engin de chantier comprenant une fonction d'arrêt d'urgence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2015/002005 WO2016140378A1 (fr) 2015-03-02 2015-03-02 Engin de chantier comprenant une fonction d'arrêt d'urgence

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WO2016140378A1 true WO2016140378A1 (fr) 2016-09-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112302092A (zh) * 2020-11-03 2021-02-02 三一重机有限公司 挖掘机启动自检方法、系统及电子设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980086021A (ko) * 1997-05-30 1998-12-05 토니헬샴 유압식 건설기계의 오동작 방지장치
JP2002121772A (ja) * 2000-10-13 2002-04-26 Shin Caterpillar Mitsubishi Ltd 作業機の制御方法およびその制御装置
JP2003097505A (ja) * 2001-09-25 2003-04-03 Yanmar Co Ltd 作業機械の油圧回路
JP2004116727A (ja) * 2002-09-27 2004-04-15 Hitachi Constr Mach Co Ltd 油圧機械の駆動制御装置及び切換弁装置
JP2013104369A (ja) * 2011-11-15 2013-05-30 Hitachi Constr Mach Co Ltd プランジャポンプの故障診断装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980086021A (ko) * 1997-05-30 1998-12-05 토니헬샴 유압식 건설기계의 오동작 방지장치
JP2002121772A (ja) * 2000-10-13 2002-04-26 Shin Caterpillar Mitsubishi Ltd 作業機の制御方法およびその制御装置
JP2003097505A (ja) * 2001-09-25 2003-04-03 Yanmar Co Ltd 作業機械の油圧回路
JP2004116727A (ja) * 2002-09-27 2004-04-15 Hitachi Constr Mach Co Ltd 油圧機械の駆動制御装置及び切換弁装置
JP2013104369A (ja) * 2011-11-15 2013-05-30 Hitachi Constr Mach Co Ltd プランジャポンプの故障診断装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112302092A (zh) * 2020-11-03 2021-02-02 三一重机有限公司 挖掘机启动自检方法、系统及电子设备

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