WO2013049964A1 - 闭式液压系统及其控制方法 - Google Patents

闭式液压系统及其控制方法 Download PDF

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Publication number
WO2013049964A1
WO2013049964A1 PCT/CN2011/080531 CN2011080531W WO2013049964A1 WO 2013049964 A1 WO2013049964 A1 WO 2013049964A1 CN 2011080531 W CN2011080531 W CN 2011080531W WO 2013049964 A1 WO2013049964 A1 WO 2013049964A1
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WIPO (PCT)
Prior art keywords
closed hydraulic
hydraulic system
control mechanism
subsystem
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/CN2011/080531
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English (en)
French (fr)
Inventor
李沛林
王佳茜
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.)
Hunan Zoomlion Special Vehicle Co Ltd
Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd
Original Assignee
Hunan Zoomlion Special Vehicle Co Ltd
Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd
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Application filed by Hunan Zoomlion Special Vehicle Co Ltd, Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd filed Critical Hunan Zoomlion Special Vehicle Co Ltd
Priority to PCT/CN2011/080531 priority Critical patent/WO2013049964A1/zh
Publication of WO2013049964A1 publication Critical patent/WO2013049964A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F15B7/00Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/005With rotary or crank input
    • F15B7/006Rotary pump input
    • 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
    • F15B7/00Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/008Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors with rotary output
    • 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
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/2053Type of pump
    • F15B2211/20546Type of pump variable capacity
    • 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
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/2053Type of pump
    • F15B2211/20561Type of pump reversible
    • 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
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27Directional control by means of the pressure source
    • 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
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/61Secondary circuits
    • F15B2211/613Feeding circuits

Definitions

  • This invention relates to the field of hydraulics and, more particularly, to a closed hydraulic system and a method of controlling a closed hydraulic system. Background technique
  • the closed hydraulic system has the advantages of stable commutation, small impact and high efficiency, and is widely used in construction machinery.
  • some construction machinery such as hydraulic boom tower cranes, crawler cranes, etc.
  • actuators such as luffing, lifting, turning, etc.
  • These actuators are generally controlled by closed hydraulic subsystems.
  • the hydraulic oil flows from the variable pump to the actuator and back to the variable pump, circulating inside the system without flowing back to the tank.
  • the total amount of oil remains unchanged, but in actual work, Avoid leakage and loss, so often set up the oil circuit to replenish the leaked and lost hydraulic oil.
  • a flushing oil circuit may be provided, and when the system is working, a part of the hot oil is replaced and returned to the oil tank for cooling.
  • the rest of the hydraulic oil overflows from the overflow valve of the charge pump relief valve or flush valve, and this part of the power loss is converted into heat. Therefore, for closed systems, the charge pump is actually a heat source and power loss point.
  • each closed hydraulic subsystem includes a variable pump, actuator, and charge circuit.
  • the system is automatically adjusted to the idle state. Because of the lower speed, the power loss is relatively small; but when any of the closed hydraulic subsystems is working, the closed hydraulic subsystem Variable pump speed needs to be increased, but due to multiple closed hydraulic subsystems
  • the variable pump is driven by an engine. Therefore, the variable pump speed in other non-operating closed hydraulic subsystems is correspondingly increased, and the charge pump is also working at the same time, which causes the power loss of the entire closed hydraulic system to be large. The heat is large. Summary of the invention
  • An object of the present invention is to provide a control method and a closed hydraulic system of a closed hydraulic system capable of reducing power loss and heat generation.
  • the present invention provides a control method of a closed hydraulic system including a plurality of closed hydraulic systems driven by the same drive source, each closed hydraulic system including The variable pump, the actuator and the charge circuit, wherein the control method comprises: determining whether each closed hydraulic subsystem is in an operating state, and unloading the charge circuit of the closed hydraulic system in the non-operating state.
  • the unloading circuit is connected to the fuel tank by disconnecting the charge circuit of the closed hydraulic system in an inoperative state.
  • the charge circuit is connected to the oil tank via a cooler.
  • the oil replenishing circuit is connected to the oil tank through a casing oil discharge port of the variable pump.
  • it is determined whether the closed hydraulic system is in an operating state by an operating position of a variable control mechanism of the variable pump of the closed hydraulic system.
  • variable control mechanism is a manual variable control mechanism, and the operating position of the manual variable control mechanism is determined by the proximity switch.
  • variable control mechanism is an electronically controlled variable control mechanism, and the operating position of the variable control mechanism is determined by an electrical signal sent by the electronically controlled variable control mechanism.
  • the replenishing circuit of the closed hydraulic subsystem is unloaded after a predetermined time delay.
  • the oil-filling circuit of the closed hydraulic system is operated normally in advance for a predetermined time, and then the closed liquid is made The pressure subsystem transitions to a working state.
  • the present invention also provides a closed hydraulic system including a plurality of closed hydraulic subsystems driven by the same drive source, each closed hydraulic subsystem including a variable pump, an actuator And the oil replenishing circuit, wherein the closed hydraulic system further comprises a controller, wherein the replenishing circuit of each closed hydraulic subsystem is connected with an unloading oil circuit, and the controller determines whether each closed hydraulic subsystem is In the working state, the unloading oil passage of the replenishing circuit of the closed hydraulic system in the working state is cut off, so that the unloading oil passage of the replenishing circuit of the closed hydraulic system in the non-operating state is turned on.
  • the unloading oil passage includes an unloading line that connects the replenishing circuit to the oil tank and an on-off valve serially connected to the unloading line, the switching valve being connected to the controller.
  • a cooler is also connected in series to the unloading line.
  • the unloading line is in communication with a housing oil discharge port of the variable displacement pump.
  • the controller determines whether the closed hydraulic subsystem is in an operating state by a variable control mechanism of the variable pressure pump of the closed hydraulic subsystem.
  • variable control mechanism is a manual variable control mechanism
  • the closed hydraulic system further includes a proximity switch that detects an operation position of the manual variable control mechanism and transmits a signal representing the operation position. Give the controller.
  • variable control mechanism is an electronically controlled variable control mechanism that transmits an electrical signal representative of the operating position to the controller.
  • the oil replenishing circuit of the closed hydraulic system is unloaded after a predetermined time delay.
  • the controller determines that the closed hydraulic subsystem is to be changed from the non-working state to the working state
  • the oil replenishing circuit of the closed hydraulic subsystem is operated normally in advance for a predetermined time, and then the closed type is The hydraulic subsystem changes to a working state.
  • the replenishing circuit of the closed hydraulic system in the non-working state is unloaded, thereby greatly reducing the unnecessary power loss of the entire closed hydraulic system and reducing Calorie.
  • FIG. 1 is a schematic schematic diagram of a closed hydraulic system in accordance with an embodiment of the present invention
  • FIG. 2 is a schematic illustration of one of the closed hydraulic systems of a closed hydraulic system in accordance with an embodiment of the present invention.
  • Figure 3 is a schematic schematic diagram of one of the closed hydraulic systems of a closed hydraulic system in accordance with another embodiment of the present invention. detailed description
  • an embodiment of the present invention provides a control method for a closed hydraulic system including a plurality of closed hydraulic subsystems 100 driven by the same drive source, each The closed hydraulic system 100 includes a variable pump 1, an actuator 2, and a charge circuit 3, wherein the control method includes: determining whether each closed hydraulic system 100 is in an operating state and closing in a non-operating state The charge circuit 3 of the hydraulic system 100 is unloaded.
  • the charge circuit 3 of the closed hydraulic system 100 in the non-operating state is unloaded, thereby greatly reducing unnecessary power loss of the entire closed hydraulic system and reducing heat generation.
  • the charge circuit 3 can be unloaded in any suitable manner, for example, the charge circuit 3 can be unloaded by connecting the charge circuit 3 to the fuel tank.
  • the charge circuit 3 is connected to the oil tank via a cooler. Thereby, the hydraulic oil flowing back to the tank can be cooled by the cooler, and the hydraulic oil of the entire hydraulic system can be cooled.
  • the charge circuit 3 is communicated to the tank through the casing discharge port of the variable pump 1, so that the casing of the variable pump 1 can be flushed, thereby causing the variable pump 1 to cool down.
  • Various ways can be used to determine if the closed hydraulic subsystem 100 is in operation. For example, it can be judged by the actuator 2 in the closed hydraulic system 100 that when the actuator 2 is actuated, the closed hydraulic system 100 is in an operating state; when the actuator 2 is not in operation, the closed hydraulic subsystem is 100 is in a non-working state, and this judgment method is easily misjudged as an inoperative state when the actuator 2 is in a stationary working state. Therefore, it is preferable to judge whether or not the closed hydraulic system 100 is in an operating state by the operation position of the variable control mechanism 4 of the variable pump 1 of the closed hydraulic system 100, which is relatively accurate.
  • variable control mechanism 4 when the variable control mechanism 4 is in the neutral position, the closed hydraulic system 100 is in the non-operating state; when the variable control mechanism 4 is in the other position, the closed hydraulic system 100 is in the working state.
  • the operating position of the manual variable control mechanism can be determined by the proximity switch 5.
  • the operational position of the variable control mechanism can be determined by an electrical signal from the electronically controlled variable control mechanism.
  • the oil charging circuit 3 of the closed hydraulic system 100 is unloaded after a predetermined time delay, thereby preventing the oil charging circuit 3 from being replenished. Unloading in advance causes the actuator 2 to relieve pressure and improve the safety of the closed hydraulic system 100; when the closed hydraulic subsystem 100 is to be changed from the non-working state to the working state, the closed time is advanced in advance.
  • the charge circuit 3 of the hydraulic subsystem 100 operates normally, and then the closed hydraulic system 100 is shifted to the working state, so that the pressure is pre-established before the closed hydraulic system 100 transitions to the working state, so that the closed hydraulic system 100 worked smoothly.
  • the present invention also provides a closed hydraulic system including a plurality of closed hydraulic subsystems 100 driven by the same drive source, each of which is closed hydraulic
  • the system 100 includes a variable pump 1, an actuator 2 and a charge circuit 3, wherein the closed hydraulic system further includes a controller, and the charge circuit 3 of each closed hydraulic system 100 is connected with an unloading oil circuit.
  • the controller determines whether each of the closed hydraulic subsystems 100 is in an operating state, and cuts off the unloading oil passage of the charge circuit 3 of the closed hydraulic system 100 in the working state, so that the closed type is in a non-operating state.
  • the unloading oil passage of the charge circuit 3 of the hydraulic system 100 is turned on.
  • the unloading oil passage may be in various suitable forms.
  • the unloading oil passage includes a discharge line 61 that connects the oil charging circuit 3 to the oil tank and is connected in series.
  • An on-off valve 62 on the line 61 is connected to the controller.
  • the controller can turn the unloading oil passage on or off by controlling the switching valve 62.
  • the switching valve 62 can be in any suitable form, such as a solenoid valve (e.g., an electromagnetic reversing valve) so that it can be electronically controlled by the controller.
  • a solenoid valve e.g., an electromagnetic reversing valve
  • the unloading line 61 is further connected in series with a cooler (not shown in the figure, the cooler may be a cooler shared by the entire closed hydraulic system), so that the charge circuit 3 is cooled.
  • the device is connected to the fuel tank so that the hydraulic oil flowing back to the tank can be cooled by the cooler, thereby cooling the hydraulic oil of the entire hydraulic system.
  • the unloading line 61 communicates with the housing oil discharge port of the variable pump, so that the oil charging circuit 3 is connected to the oil tank through the casing oil discharge port of the variable pump 1, thereby enabling The housing of the variable pump 1 is flushed to cool the variable pump 1.
  • the controller determines whether the closed hydraulic system 100 is in an operating state by the operating position of the variable control mechanism 4 of the variable pump 1 of the closed hydraulic system 100. gP, when the variable control mechanism 4 is in the neutral position, the closed hydraulic system 100 is in the non-operating state; when the variable control mechanism 4 is in other positions, the closed hydraulic system 100 is in the working state.
  • the variable control mechanism 4 is a manual variable control mechanism.
  • the closed hydraulic system further includes a proximity switch 5 that detects an operational position of the manual variable control mechanism and transmits a signal representative of the operational position to the controller.
  • the variable control mechanism 4 may include a servo cylinder 41, a servo valve 42, an electromagnetic reversing valve 43, and a manual pressure reducing valve 44.
  • the displacement and direction of rotation of the variable displacement pump 1 can be controlled by operating the handle of the manual pressure reducing valve 44.
  • the travel switch 5 is connected to the handle of the manual pressure reducing valve 44.
  • the travel switch 5 When the handle is in the neutral position, the travel switch 5 is opened, the controller controls the switch valve 62 to be turned on, and the unloading circuit is turned on; when the handle is in other positions, the stroke When the switch 5 is closed, the controller controls the on-off valve 62 to be turned off, so that the unloading circuit is turned off.
  • variable control mechanism 4 is an electronically controlled variable control mechanism
  • the operational position of the variable control mechanism can be determined by an electrical signal from the electronically controlled variable control mechanism.
  • the variable control mechanism 4 may include a servo cylinder 41 and an electromagnetic proportional valve 45, which control the energization or de-energization of the two proportional electromagnets of the electromagnetic proportional valve 45 and the current.
  • the size can control the direction and displacement of the variable pump 1.
  • the operator sends an electrical signal representative of the operating position to the controller by controlling the switch of the proportional electromagnet (knob or electrical operating handle), and the controller receives the electrical signal and sends the electrical signal to the electromagnetic proportional valve
  • the controller controls the on-off valve 62 to be turned on to make the unloading circuit conduct; when the electric signal represents the electromagnetic proportional valve 45 is at another position At the time of the signal, the controller controls the on-off valve 62 to be turned off to turn off the unloading circuit.
  • the oil charging circuit 3 of the closed hydraulic system 100 is unloaded after a predetermined time delay (for example, first A signal representing the working position is sent to the electromagnetic proportional valve 45, and after a predetermined time delay, a signal is sent to the switching valve 62 to turn on the switching valve 62, thereby preventing the actuator 2 from being relieved by the unloading of the charging circuit 3 in advance.
  • a predetermined time delay for example, first A signal representing the working position is sent to the electromagnetic proportional valve 45, and after a predetermined time delay, a signal is sent to the switching valve 62 to turn on the switching valve 62, thereby preventing the actuator 2 from being relieved by the unloading of the charging circuit 3 in advance.
  • the controller determines that the closed hydraulic subsystem 100 is to be transitioned from a non-working state to a working state
  • the charge circuit 3 of the closed hydraulic system 100 is normally operated, and then the closed hydraulic system 100 is switched to the working state (for example, the signal is first sent to the on-off valve 62 to turn off the on-off valve 62).
  • the signal representing the working position is sent to the electromagnetic proportional valve 45), so that the pressure is established in advance before the closed hydraulic system 100 shifts to the working state, so that the closed hydraulic system 100 operates smoothly.
  • the charge circuit 3 generally includes a charge pump 31 and a relief valve 32 connected in series. There are two unidirectional relief valves 7 connected in series between the high pressure oil circuit and the low pressure oil circuit of the variable pump 1.
  • the charge pump 31 is usually connected to the line between the two one-way relief valves 7, thereby being a variable pump.
  • the low pressure oil circuit of 1 supplements the hydraulic oil.
  • the actuator 2 of the closed hydraulic system 100 is also typically connected with a flush valve 8 to displace a portion of the hot oil return tank for cooling.
  • the actuator 2 is shown as a hydraulic motor, but the actuator 2 may be a hydraulic cylinder or the like.
  • Figure 1 is a schematic view of a hydraulic system of a main mechanism of a tower crane, the closed hydraulic system comprising four closed hydraulic subsystems 100, from left to right, first and second
  • the closed hydraulic system 100 is used to control the lifting action of the tower crane
  • the third closed hydraulic system 100 is used to control the luffing action of the tower crane
  • the fourth closed hydraulic subsystem 100 is used for controlling The rotary motion of the tower crane.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

公开了一种闭式液压系统的控制方法,该闭式液压系统包括由相同的驱动源驱动的多个闭式液压子系统(100),每个闭式液压子系统包括变量泵(1)、执行机构(2)和补油回路(3),其中,控制方法包括:判断每个闭式液压子系统(100)是否处于工作状态,并使处于非工作状态的闭式液压子系统(100)的补油回路(3)卸荷。还公开了一种闭式液压系统,闭式液压系统还包括控制器,每个闭式液压子系统(100)的补油回路(3)旁接有卸荷油路,控制器判断每个闭式液压子系统(100)是否处于工作状态,并使处于非工作状态的闭式液压子系统(100)的补油回路(3)的卸荷油路导通。通过使处于非工作状态的闭式液压子系统的补油回路卸荷,能够大大降低整个闭式液压系统的不必要的功率损耗,并减少发热量。

Description

闭式液压系统及其控制方法
技术领域
本发明涉及液压领域, 更具体地, 涉及一种闭式液压系统和一种闭式 液压系统的控制方法。 背景技术
闭式液压系统具有换向平稳, 冲击小, 效率高等优点, 在工程机械中 应用非常广泛。 在一些工程机械中如液压动臂塔式起重机、 履带式起重机 等, 往往具有多个执行机构如变幅、 起升、 回转等, 这些执行机构一般分 别采用闭式液压子系统控制。
在闭式液压系统中, 液压油从变量泵流至执行机构再回到变量泵, 在 系统内部循环而不流回油箱, 理论上, 油液总量保持不变, 但实际工作过 程中, 不可避免会存在泄漏和损耗, 因此往往设置补油回路, 及时补充泄 漏和损耗的液压油。 同时, 闭式液压系统中, 由于油液始终在系统内循环, 为避免系统温度过高, 还可以设置有冲洗油路, 在系统工作时, 置换一部 分热油回油箱冷却。 除了补充泄漏和损耗外, 其余的液压油均从补油泵溢 流阀或冲洗阀的溢流阀溢流, 这部分功率损失全部转换为热量。 因此, 对 闭式系统而言, 补油泵其实也是一个发热源和功率损耗点。
因此, 如果闭式液压系统具有多个闭式液压子系统 (例如上文所述的 工程机械的液压系统中包括分别用于变幅、 起升、 回转等的多个闭式液压 子系统), 每个闭式液压子系统均包括变量泵、 执行机构和补油回路。 当任 何闭式液压子系统都不工作时, 系统一般自动调到怠速状态, 由于转速较 低, 功率损耗相对较小; 但是当其中任何一个闭式液压子系统工作时, 该 闭式液压子系统中的变量泵转速需增加, 但由于多个闭式液压子系统中的 变量泵采用一个发动机驱动, 因此, 其它处于非工作状态的闭式液压子系 统中的变量泵转速也相应增加, 其补油泵也同时工作, 会导致整个闭式液 压系统的功率损耗较大, 发热量较大。 发明内容
本发明的目的是提供一种能够降低功率损耗和发热量的闭式液压系统 的控制方法和闭式液压系统。
为了实现上述目的, 一方面, 本发明提供一种闭式液压系统的控制方 法, 该闭式液压系统包括由相同的驱动源驱动的多个闭式液压子系统, 每 个闭式液压子系统包括变量泵、 执行机构和补油回路, 其中, 所述控制方 法包括: 判断每个闭式液压子系统是否处于工作状态, 并使处于非工作状 态的闭式液压子系统的补油回路卸荷。
优选地, 通过使处于非工作状态的闭式液压子系统的所述补油回路连 通到油箱进行卸荷。
优选地, 所述补油回路经过冷却器连通到油箱。
优选地, 所述补油回路经过所述变量泵的壳体卸油口连通到油箱。 优选地, 通过所述闭式液压子系统的变量泵的变量控制机构的操作位 置来判断该闭式液压子系统是否处于工作状态。
优选地, 所述变量控制机构为手动式变量控制机构, 通过接近开关来 确定该手动式变量控制机构的操作位置。
优选地, 所述变量控制机构为电控式变量控制机构, 通过该电控式变 量控制机构发出的电信号来确定该变量控制机构的操作位置。
优选地, 当所述闭式液压子系统由工作状态转变至非工作状态时, 延 迟预定时间后使该闭式液压子系统的补油回路卸荷。
优选地, 当所述闭式液压子系统要由非工作状态转变至工作状态时, 先提前预定时间使该闭式液压子系统的补油回路正常工作, 再使该闭式液 压子系统转变至工作状态。
另一方面, 本发明还提供了一种闭式液压系统, 该闭式液压系统包括 由相同的驱动源驱动的多个闭式液压子系统, 每个闭式液压子系统包括变 量泵、 执行机构和补油回路, 其中, 所述闭式液压系统还包括控制器, 每 个闭式液压子系统的补油回路旁接有卸荷油路, 所述控制器判断每个闭式 液压子系统是否处于工作状态, 并使处于工作状态的闭式液压子系统的补 油回路的卸荷油路截止, 使处于非工作状态的闭式液压子系统的补油回路 的卸荷油路导通。
优选地, 所述卸荷油路包括将所述补油回路连通到油箱的卸荷管路和 串接在该卸荷管路上的开关阀, 该开关阀与所述控制器连接。
优选地, 所述卸荷管路上还串接有冷却器。
优选地, 所述卸荷管路与所述变量泵的壳体卸油口连通。
优选地, 所述控制器通过所述闭式液压子系统的变量泵的变量控制机 构的操作位置来判断该闭式液压子系统是否处于工作状态。
优选地, 所述变量控制机构为手动式变量控制机构, 所述闭式液压系 统还包括接近开关, 该接近开关检测所述手动式变量控制机构的操作位置, 并将代表该操作位置的信号发送给所述控制器。
优选地, 所述变量控制机构为电控式变量控制机构, 该电控式变量控 制机构将代表所述操作位置的电信号发送给所述控制器。
优选地, 当所述控制器判断所述闭式液压子系统由工作状态转变至非 工作状态时, 延迟预定时间后使该闭式液压子系统的补油回路卸荷。
优选地, 当所述控制器判断所述闭式液压子系统要由非工作状态转变 至工作状态时, 先提前预定时间使该闭式液压子系统的补油回路正常工作, 再使该闭式液压子系统转变至工作状态。
通过上述技术方案, 使处于非工作状态的闭式液压子系统的补油回路 卸荷, 从而能够大大降低整个闭式液压系统的不必要的功率损耗, 并减少 发热量。
本发明的其他特征和优点将在随后的具体实施方式部分予以详细说 明。 附图说明
附图是用来提供对本发明的进一步理解, 并且构成说明书的一部分, 与下面的具体实施方式一起用于解释本发明, 但并不构成对本发明的限制。 在附图中:
图 1是根据本发明的一种实施方式的闭式液压系统的示意性原理图; 图 2是根据本发明的一种实施方式的闭式液压系统的其中一个闭式液 压子系统的示意性原理图;
图 3 是根据本发明的另一种实施方式的闭式液压系统的其中一个闭式 液压子系统的示意性原理图。 具体实施方式
以下结合附图对本发明的具体实施方式进行详细说明。应当理解的是, 此处所描述的具体实施方式仅用于说明和解释本发明, 并不用于限制本发 明。
如图 1所示, 根据本发明的一种实施方式提供了一种闭式液压系统的 控制方法, 该闭式液压系统包括由相同的驱动源驱动的多个闭式液压子系 统 100, 每个闭式液压子系统 100包括变量泵 1、执行机构 2和补油回路 3, 其中, 所述控制方法包括: 判断每个闭式液压子系统 100是否处于工作状 态, 并使处于非工作状态的闭式液压子系统 100的补油回路 3卸荷。
通过上述技术方案, 使处于非工作状态的闭式液压子系统 100 的补油 回路 3 卸荷, 从而能够大大降低整个闭式液压系统的不必要的功率损耗, 并减少发热量。 可以采用各种适当的方式使补油回路 3 卸荷, 例如, 可以通过使补油 回路 3连通到油箱而使得所述补油回路 3卸荷。 优选地, 所述补油回路 3 经过冷却器连通到油箱。 从而可以利用冷却器对流回油箱的液压油进行冷 却, 进而对整个液压系统的液压油进行冷却。 或者优选地, 如图 1 所示, 使补油回路 3经过变量泵 1的壳体卸油口连通到油箱,从而能够对变量泵 1 的壳体进行冲洗, 从而使得变量泵 1降温。
可以采用各种方式来判断闭式液压子系统 100是否处于工作状态。 例 如, 可以通过闭式液压子系统 100中的执行机构 2来判断, 当执行机构 2 动作时, 则闭式液压子系统 100处于工作状态; 当执行机构 2不动作时, 则闭式液压子系统 100处于非工作状态,这种判断方式容易由于执行机构 2 处于静止的工作状态时而被误判断为非工作状态。 因此优选地, 通过所述 闭式液压子系统 100的变量泵 1的变量控制机构 4的操作位置来判断该闭 式液压子系统 100是否处于工作状态, 这种判断方式比较准确。 gp, 当变 量控制机构 4处于中位时, 则闭式液压子系统 100处于非工作状态; 当变 量控制机构 4处于其他位置时, 则闭式液压子系统 100处于工作状态。 例 如, 如图 2所示, 如果所述变量控制机构 4为手动式变量控制机构, 则可 以通过接近开关 5来确定该手动式变量控制机构的操作位置。 如图 3所示, 如果所述变量控制机构 4为电控式变量控制机构, 则可以通过该电控式变 量控制机构发出的电信号来确定该变量控制机构的操作位置。
优选地, 当所述闭式液压子系统 100由工作状态转变至非工作状态时, 延迟预定时间后使该闭式液压子系统 100的补油回路 3卸荷, 从而可以防 止因补油回路 3提前卸荷而导致执行机构 2卸压,提高闭式液压子系统 100 的安全性; 当所述闭式液压子系统 100要由非工作状态转变至工作状态时, 先提前预定时间使该闭式液压子系统 100的补油回路 3正常工作, 再使该 闭式液压子系统 100转变至工作状态, 从而在闭式液压子系统 100转变至 工作状态之前, 预先建立压力, 使得闭式液压子系统 100顺利工作。 另一方面, 如图 1 所示, 本发明还提供了一种闭式液压系统, 该闭式 液压系统包括由相同的驱动源驱动的多个闭式液压子系统 100,每个闭式液 压子系统 100包括变量泵 1、 执行机构 2和补油回路 3, 其中, 所述闭式液 压系统还包括控制器, 每个闭式液压子系统 100的补油回路 3旁接有卸荷 油路, 所述控制器判断每个闭式液压子系统 100是否处于工作状态, 并使 处于工作状态的闭式液压子系统 100的补油回路 3的卸荷油路截止, 使处 于非工作状态的闭式液压子系统 100的补油回路 3的卸荷油路导通。
所述卸荷油路可以为各种适当的形式, 例如如图 1所示, 所述卸荷油 路包括将所述补油回路 3连通到油箱的卸荷管路 61和串接在该卸荷管路 61 上的开关阀 62, 该开关阀 62与所述控制器连接。从而控制器可以通过控制 所述开关阀 62来使所述卸荷油路导通或截止。
所述开关阀 62可以为各种适当的形式, 例如可以为电磁阀 (例如电磁 换向阀), 从而可以通过控制器进行电控。
优选地, 所述卸荷管路 61上还串接有冷却器 (图中未示出, 该冷却器 可以为整个闭式液压系统共用的冷却器), 以使得所述补油回路 3经过冷却 器连通到油箱, 从而可以利用冷却器对流回油箱的液压油进行冷却, 进而 对整个液压系统的液压油进行冷却。 或者优选地, 如图 1 所示, 所述卸荷 管路 61与变量泵的壳体卸油口连通, 以使得补油回路 3经过变量泵 1的壳 体卸油口连通到油箱, 从而能够对变量泵 1 的壳体进行冲洗, 从而使得变 量泵 1降温。
如上文所述, 优选地, 所述控制器通过所述闭式液压子系统 100 的变 量泵 1的变量控制机构 4的操作位置来判断该闭式液压子系统 100是否处 于工作状态。 gP, 当变量控制机构 4 处于中位时, 则闭式液压子系统 100 处于非工作状态; 当变量控制机构 4处于其他位置时, 则闭式液压子系统 100处于工作状态。
例如, 如图 2所示, 所述变量控制机构 4为手动式变量控制机构, 所 述闭式液压系统还包括接近开关 5,该接近开关 5检测所述手动式变量控制 机构的操作位置, 并将代表该操作位置的信号发送给所述控制器。 例如在 图 2所示的更具体的实施例中, 变量控制机构 4可以包括伺服缸 41、 伺服 阀 42、 电磁换向阀 43和手动减压阀 44。 通过操作手动减压阀 44的手柄可 以控制变量泵 1的排量和转动方向。行程开关 5与手动减压阀 44的手柄连 接, 当手柄处于中位时, 行程开关 5断开, 控制器控制开关阀 62导通, 使 卸荷回路导通; 当手柄处于其他位置时, 行程开关 5 闭合, 控制器控制开 关阀 62截止, 使卸荷回路截止。
如图 3所示, 如果所述变量控制机构 4为电控式变量控制机构, 则可 以通过该电控式变量控制机构发出的电信号来确定该变量控制机构的操作 位置。 例如在图 3所示的更具体的实施例中, 变量控制机构 4可以包括伺 服缸 41和电磁比例阀 45, 通过控制电磁比例阀 45的两个比例电磁铁的得 电或失电以及电流的大小可以控制变量泵 1 的转动方向和排量。 操作人员 通过控制比例电磁铁的开关 (旋钮或电器操作手柄) 来向控制器发送代表 操作位置的电信号, 控制器接收该电信号并将该电信号发送给电磁比例阀
45, 并且当该电信号为代表电磁比例阀 45处于中位的信号时, 控制器控制 开关阀 62导通, 使卸荷回路导通; 当手该电信号代表电磁比例阀 45处于 其他位置的信号时, 控制器控制开关阀 62截止, 使卸荷回路截止。
图 2和图 3中仅显示了其中一个闭式液压子系统 100 (尤其是变量控制 机构 4 ) 的原理图, 其他闭式液压子系统 100也类似, 不再赘述。
优选地, 当所述控制器判断所述闭式液压子系统 100 由工作状态转变 至非工作状态时, 延迟预定时间后使该闭式液压子系统 100 的补油回路 3 卸荷 (例如, 先向电磁比例阀 45发送代表工作位置的信号, 延迟预定时间 后再向开关阀 62发送信号使开关阀 62导通), 从而可以防止因补油回路 3 提前卸荷而导致执行机构 2卸压, 提高闭式液压子系统 100的安全性; 当 所述控制器判断所述闭式液压子系统 100要由非工作状态转变至工作状态 时, 先提前预定时间使该闭式液压子系统 100的补油回路 3正常工作, 再 使该闭式液压子系统 100转变至工作状态(例如, 先向开关阀 62发送信号 使开关阀 62截止, 延迟预定时间后再向电磁比例阀 45发送代表工作位置 的信号),从而在闭式液压子系统 100转变至工作状态之前,预先建立压力, 使得闭式液压子系统 100顺利工作。
闭式液压子系统 100中的变量泵 1、执行机构 2和补油回路 3的具体连 接关系为本领域所公知, 因此不再详细说明。 例如, 如图 1至图 3所示, 补油回路 3通常包括串接的补油泵 31和溢流阀 32。变量泵 1的高压油路和 低压油路之间通常串接有两个单向溢流阀 7, 补油泵 31通常连接至两个单 向溢流阀 7之间的管路上, 从而为变量泵 1的低压油路补充液压油。 闭式 液压子系统 100的执行机构 2上通常还连接有冲洗阀 8,以置换一部分热油 回油箱冷却。 在图 1至图 3中, 执行机构 2显示为液压马达, 但是执行机 构 2也可以为液压缸等。
图 1 中示意性显示的是一种塔式起重机的主要机构的液压系统简图, 该闭式液压系统包括四个闭式液压子系统 100, 其中从左往右看, 第一个和 第二个闭式液压子系统 100用于控制塔式起重机的起升动作, 第三个闭式 液压子系统 100用于控制塔式起重机的变幅动作, 第四个闭式液压子系统 100用于控制塔式起重机的回转动作。
以上结合附图详细描述了本发明的优选实施方式, 但是, 本发明并不 限于上述实施方式中的具体细节, 在本发明的技术构思范围内, 可以对本 发明的技术方案进行多种简单变型, 这些简单变型均属于本发明的保护范 围。
另外需要说明的是, 在上述具体实施方式中所描述的各个具体技术特 征, 在不矛盾的情况下, 可以通过任何合适的方式进行组合。 为了避免不 必要的重复, 本发明对各种可能的组合方式不再另行说明。
此外, 本发明的各种不同的实施方式之间也可以进行任意组合, 只要 其不违背本发明的思想, 其同样应当视为本发明所公开的内容。

Claims

权利要求
1、 一种闭式液压系统的控制方法, 该闭式液压系统包括由相同的驱动 源驱动的多个闭式液压子系统 (100), 每个闭式液压子系统 (100) 包括变 量泵 (1 )、 执行机构 (2) 和补油回路 (3 ), 其特征在于, 所述控制方法包 括: 判断每个闭式液压子系统 (100) 是否处于工作状态, 并使处于非工作 状态的闭式液压子系统 (100) 的补油回路 (3 ) 卸荷。
2、 根据权利要求 1所述的闭式液压系统的控制方法, 其特征在于, 通 过使处于非工作状态的闭式液压子系统 (100) 的所述补油回路 (3 ) 连通 到油箱进行卸荷。
3、 根据权利要求 2所述的闭式液压系统的控制方法, 其特征在于, 所 述补油回路 (3 ) 经过冷却器连通到油箱。
4、 根据权利要求 2所述的闭式液压系统的控制方法, 其特征在于, 所 述补油回路 (3 ) 经过所述变量泵 (1 ) 的壳体卸油口连通到油箱。
5、 根据权利要求 1至 4中任意一项所述的闭式液压系统的控制方法, 其特征在于, 通过所述闭式液压子系统 (100) 的变量泵 (1 ) 的变量控制 机构 (4) 的操作位置来判断该闭式液压子系统 (100) 是否处于工作状态。
6、 根据权利要求 5所述的闭式液压系统的控制方法, 其特征在于, 所 述变量控制机构 (4) 为手动式变量控制机构, 通过接近开关 (5 ) 来确定 该手动式变量控制机构的操作位置。
7、 根据权利要求 5所述的闭式液压系统的控制方法, 其特征在于, 所 述变量控制机构 (4) 为电控式变量控制机构, 通过该电控式变量控制机构 发出的电信号来确定该变量控制机构的操作位置。
8、 根据权利要求 1至 4中任意一项所述的闭式液压系统的控制方法, 其特征在于, 当所述闭式液压子系统 (100) 由工作状态转变至非工作状态 时, 延迟预定时间后使该闭式液压子系统 (100) 的补油回路 (3 ) 卸荷。
9、 根据权利要求 1至 4中任意一项所述的闭式液压系统的控制方法, 其特征在于, 当所述闭式液压子系统 (100) 要由非工作状态转变至工作状 态时, 先提前预定时间使该闭式液压子系统 (100) 的补油回路 (3 ) 正常 工作, 再使该闭式液压子系统 (100) 转变至工作状态。
10、 一种闭式液压系统, 该闭式液压系统包括由相同的驱动源驱动的 多个闭式液压子系统(100), 每个闭式液压子系统(100)包括变量泵(1 )、 执行机构 (2) 和补油回路 (3 ), 其特征在于, 所述闭式液压系统还包括控 制器, 每个闭式液压子系统 (100) 的补油回路 (3 ) 旁接有卸荷油路, 所 述控制器判断每个闭式液压子系统 (100) 是否处于工作状态, 并使处于工 作状态的闭式液压子系统 (100) 的补油回路 (3 ) 的卸荷油路截止, 使处 于非工作状态的闭式液压子系统 (100) 的补油回路 (3 ) 的卸荷油路导通。
11、 根据权利要求 10所述的闭式液压系统, 其特征在于, 所述卸荷油 路包括将所述补油回路 (3 ) 连通到油箱的卸荷管路 (61 ) 和串接在该卸荷 管路 (61 ) 上的开关阀 (62), 该开关阀 (62) 与所述控制器连接。
12、 根据权利要求 11所述的闭式液压系统, 其特征在于, 所述卸荷管 路 (61 ) 上还串接有冷却器。
13、 根据权利要求 11所述的闭式液压系统, 其特征在于, 所述卸荷管 路 (61 ) 与所述变量泵 (1 ) 的壳体卸油口连通。
14、 根据权利要求 10至 13中任意一项所述的闭式液压系统, 其特征 在于, 所述控制器通过所述闭式液压子系统 (100) 的变量泵 (1 ) 的变量 控制机构 (4) 的操作位置来判断该闭式液压子系统 (100) 是否处于工作 状态。
15、 根据权利要求 14所述的闭式液压系统, 其特征在于, 所述变量控 制机构(4)为手动式变量控制机构,所述闭式液压系统还包括接近开关(5 ), 该接近开关 (5 ) 检测所述手动式变量控制机构的操作位置, 并将代表该操 作位置的信号发送给所述控制器。
16、 根据权利要求 14所述的闭式液压系统, 其特征在于, 所述变量控 制机构 (4) 为电控式变量控制机构, 该电控式变量控制机构将代表所述操 作位置的电信号发送给所述控制器。
17、 根据权利要求 10至 13中任意一项所述的闭式液压系统, 其特征 在于, 当所述控制器判断所述闭式液压子系统 (100) 由工作状态转变至非 工作状态时, 延迟预定时间后使该闭式液压子系统 (100) 的补油回路 (3 ) 卸荷。
18、 根据权利要求 10至 13中任意一项所述的闭式液压系统, 其特征 在于, 当所述控制器判断所述闭式液压子系统 (100) 要由非工作状态转变 至工作状态时,先提前预定时间使该闭式液压子系统(100)的补油回路(3 ) 正常工作, 再使该闭式液压子系统 (100) 转变至工作状态。
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Publication number Priority date Publication date Assignee Title
JP2003049809A (ja) * 2001-08-07 2003-02-21 Hitachi Constr Mach Co Ltd 圧油のエネルギー回収装置および圧油のエネルギー回収装置を備えた建設機械
KR20040084499A (ko) * 2003-03-28 2004-10-06 학교법인 울산공업학원 능동식 부하 시뮬레이터 유압회로
CN101554775A (zh) * 2009-05-11 2009-10-14 张家港市普天机械制造有限公司 中空吹塑成型机中的液压驱动装置
CN201747703U (zh) * 2010-05-25 2011-02-16 长沙中联重工科技发展股份有限公司 闭式液压系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003049809A (ja) * 2001-08-07 2003-02-21 Hitachi Constr Mach Co Ltd 圧油のエネルギー回収装置および圧油のエネルギー回収装置を備えた建設機械
KR20040084499A (ko) * 2003-03-28 2004-10-06 학교법인 울산공업학원 능동식 부하 시뮬레이터 유압회로
CN101554775A (zh) * 2009-05-11 2009-10-14 张家港市普天机械制造有限公司 中空吹塑成型机中的液压驱动装置
CN201747703U (zh) * 2010-05-25 2011-02-16 长沙中联重工科技发展股份有限公司 闭式液压系统

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