WO2012171206A1 - 变量泵的恒功率控制装置、方法以及混凝土泵送装置 - Google Patents

变量泵的恒功率控制装置、方法以及混凝土泵送装置 Download PDF

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Publication number
WO2012171206A1
WO2012171206A1 PCT/CN2011/075821 CN2011075821W WO2012171206A1 WO 2012171206 A1 WO2012171206 A1 WO 2012171206A1 CN 2011075821 W CN2011075821 W CN 2011075821W WO 2012171206 A1 WO2012171206 A1 WO 2012171206A1
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Prior art keywords
variable pump
displacement
constant power
variable
pump
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PCT/CN2011/075821
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English (en)
French (fr)
Inventor
裴杰
郭岗
刘波
Original Assignee
长沙中联重工科技发展股份有限公司
湖南中联重科专用车有限责任公司
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Application filed by 长沙中联重工科技发展股份有限公司, 湖南中联重科专用车有限责任公司 filed Critical 长沙中联重工科技发展股份有限公司
Priority to PCT/CN2011/075821 priority Critical patent/WO2012171206A1/zh
Publication of WO2012171206A1 publication Critical patent/WO2012171206A1/zh

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02Stopping, starting, unloading or idling control
    • F04B49/03Stopping, starting, unloading or idling control by means of valves
    • 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
    • F15B2211/26Power control functions
    • 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
    • F15B2211/63Electronic controllers
    • F15B2211/6303Electronic controllers using input signals
    • F15B2211/6306Electronic controllers using input signals representing a pressure
    • F15B2211/6309Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure

Definitions

  • Constant power control device method and concrete pumping device for variable pump
  • the present invention relates to a constant power control device and method for a variable pump, and to a concrete pumping device for a constant power control device having the variable pump. Background technique
  • variable pump of the construction machine run at a constant power, which is usually achieved by setting a constant power control device for the variable pump.
  • a constant power control device for the variable pump for example, in a concrete pumping device such as a vehicle-mounted concrete pump or a concrete pump truck, in order to make the concrete conveying continuous and smooth and to make the concrete conveying amount relatively large, it is usually necessary to make the working power of the main oil pump (ie, the variable pump) and drive the The power of the variable pump power unit is adapted and the variable pump is operated at the appropriate power constant power.
  • a controller In existing vehicle-mounted concrete pumps and concrete pump trucks, it is usually achieved by setting a controller and adding a constant power valve block to the variable pump.
  • the controller adjusts the constant power valve block of the variable pump based on the respective power of the power unit (e.g., motor or engine) that drives the variable pump such that the variable pump operates constantly at a power that is compatible with the power of the power unit.
  • the power unit e.g., motor or engine
  • this requires the addition of a constant power valve block to the variable pump.
  • a variable displacement pump with a constant power valve block must be used, limiting the versatility of the components.
  • the object of the present invention is to provide a constant power control device and method for a variable pump.
  • the constant power control device and method of the variable pump By using the constant power control device and method of the variable pump, the variable pump can be operated at a constant power without using a variable pump with a constant power valve block. Therefore, the components are more versatile.
  • the present invention provides a constant power control device for a variable pump, the variable pump being provided with a displacement control valve block, wherein the constant power control device includes each other a connected pressure sensor and a controller, the controller is also connected to the displacement control valve block; the pressure sensor detects the working pressure of the variable pump, and sends a signal representing the working pressure of the variable pump to the controller; the controller receives the representative variable pump A signal of the working pressure, and a signal representing the displacement required by the variable pump based on the set power and the working pressure is sent to the displacement control valve block.
  • the constant power control device includes each other a connected pressure sensor and a controller, the controller is also connected to the displacement control valve block; the pressure sensor detects the working pressure of the variable pump, and sends a signal representing the working pressure of the variable pump to the controller; the controller receives the representative variable pump A signal of the working pressure, and a signal representing the displacement required by the variable pump based on the set power and the working pressure is sent to the displacement control valve block.
  • the controller comprises a receiving module, a control module and a transmitting module which are sequentially connected, the receiving module receives a signal representing the working pressure of the variable pump, and sends the signal to the control module; the control module will represent the power according to the power setting The signal of the displacement required by the variable pump obtained by the fixed value and the working pressure is sent to the transmitting module; the transmitting module sends a signal representing the displacement required by the variable pump to the displacement control valve block.
  • the controller is preset with a plurality of set powers.
  • the displacement control valve block is an electronically controlled displacement control valve
  • the controller is connected to a control port of the electronically controlled displacement control valve.
  • the displacement control valve block comprises a hydraulically controlled displacement control valve and an electromagnetic proportional pressure reducing valve
  • the controller is connected to a control port of the electromagnetic proportional pressure reducing valve, and the electromagnetic proportional pressure reducing valve
  • the output port is connected to the control port of the hydraulically controlled displacement control valve.
  • the controller is a programmable controller.
  • variable pump is for an open hydraulic system
  • pressure sensor is coupled to an oil outlet of the variable pump
  • variable pump is used in a closed hydraulic system
  • constant power control device further includes a shuttle valve, and the oil outlet and the oil inlet of the variable pump are respectively connected to the two inlets of the shuttle valve, The outlet of the shuttle valve is connected to the pressure sensor.
  • variable pump is used in an open hydraulic system
  • displacement control valve block is connected in series between the oil outlet of the variable pump and the displacement control port.
  • the variable pump is used in a closed hydraulic system, and the displacement control valve block is serially connected between an oil outlet of the charge pump of the variable pump and a displacement control port of the variable pump.
  • the present invention also provides a concrete pumping device, wherein the concrete pumping device comprises a constant power control device of the variable pump, the variable pump being the main pumping cylinder of the concrete pumping device Pump.
  • the hydraulic system of the concrete pumping device is an open hydraulic system
  • the displacement control valve block is serially connected to the oil outlet of the main pump of the swing cylinder of the concrete pumping device and the variable pump Between the displacement control ports.
  • the present invention provides a constant power control method for a variable pump, wherein the variable pump is provided with a displacement control valve block, wherein the constant power control method of the variable pump comprises: a detecting step: detecting The working pressure of the variable pump; and the controlling step: obtaining a displacement required by the variable pump according to the set power and the working pressure, and transmitting a signal representing the displacement required by the variable pump to the Displacement control valve block.
  • the set power is plural.
  • variable pump is used in an open hydraulic system, and in the detecting step, the pressure of the oil outlet of the variable pump is detected as the working pressure of the variable pump.
  • variable pump is used in a closed hydraulic system, in the detecting step: detecting and comparing the oil outlet pressure and the inlet pressure of the variable pump, and using a larger pressure as the variable pump pressure.
  • variable pump is further provided with a constant power valve
  • constant power control method of the variable pump further comprises setting a maximum constant power value of the variable pump by the constant power valve.
  • the displacement control valve block of the variable pump can be used, and the constant power operation of the variable pump can be realized by controlling the displacement of the variable pump without adding a constant power valve block to the variable pump, thereby improving Component versatility.
  • Figure 1 is a schematic block diagram of an embodiment in accordance with the present invention.
  • FIG. 2 is a schematic block diagram of another embodiment in accordance with the present invention.
  • FIG. 3 is a schematic block diagram of still another embodiment in accordance with the present invention. Description of the reference numerals
  • Nl, N2, N3 set power Q displacement
  • an embodiment of the present invention provides a constant power control device for a variable pump
  • the variable pump is provided with a displacement control valve block 1
  • the constant power control device includes interconnections
  • the pressure sensor 3 and the controller 4 the controller 4 is also connected to the displacement control valve block 1;
  • the pressure sensor detects the working pressure P of the variable pump, and sends a signal representing the working pressure P of the variable pump to the controller 4;
  • the controller 4 receives a signal representing the operating pressure P of the variable pump, and transmits a signal representing the displacement Q required by the variable pump obtained based on the set power N1 and the operating pressure P to the displacement control valve block 1.
  • the controller 4 can adopt various specific settings.
  • the controller 4 can include a receiving module 41, a control module 42, and a sending module that are sequentially connected. 43.
  • the receiving module 41 receives a signal representative of the working pressure P of the variable pump and sends the signal to the control module 42.
  • the control module 42 will represent the variable pump unit obtained according to the power setting value N1 and the working pressure P.
  • the signal of the required displacement Q is sent to the transmitting module 43; the transmitting module 43 sends a signal representing the displacement Q required by the variable pump to the displacement control valve block 1.
  • the controller 4 is pre-set with a plurality of set powers N1, N2, N3 o, thereby driving the variable pump by dual-power or multi-stage power, or in different working conditions.
  • the variable pump needs to be operated at different powers, and by selecting an appropriate set power, the variable pump can be operated at a power compatible with the power unit or the operating condition.
  • the controller may further include an input module, through which the input module may be input to select a required set power (eg, N1) among the plurality of set powers N1, N2, N3, and The selected set power signal is sent to the receiving module 41, and the receiving module 41 receives the signal representing the selected set power and the signal representing the working pressure P of the variable pump, and sends the two signals to the control module.
  • the control module 42 sends a signal representing the displacement Q required by the variable pump according to the selected power setting value and the working pressure P to the transmitting module 43; the transmitting module 43 will represent the displacement required by the variable pump
  • the signal of Q is sent to the displacement control valve block 1.
  • variable pump can be operated at different constant power values by having the controller 4 pre-set with a plurality of set powers N1, N2, N3.
  • the present invention does not exclude the use of a constant power valve, and the constant power control device of the variable pump can be further provided with a constant power valve through which the maximum constant power value is set for the variable pump.
  • the constant power valve acts, the controller does not work; when the variable pump needs to be in the controller When the preset other constant power value is running, the controller acts and the constant power valve does not work.
  • a constant power control device as described above may be additionally provided to control the maximum constant power value through the constant power valve while controlling the constant power.
  • the controller presets one or more set powers (the set power value is lower than the maximum constant power value set by the constant power valve) to realize that the variable pump operates at different constant power values as needed.
  • the displacement control valve block 1 may include an electronically controlled displacement control valve or a hydraulically controlled displacement control valve.
  • the displacement control valve block 1 may be an electronically controlled displacement control valve, and the controller 4 may be connected to a control port of the electronically controlled displacement control valve; optionally, the displacement control
  • the valve block 1 may include a hydraulically controlled displacement control valve and an electromagnetic proportional pressure reducing valve, the controller 4 being connected to a control port of the electromagnetic proportional pressure reducing valve, an output port of the electromagnetic proportional pressure reducing valve and the The control port of the hydraulic control displacement control valve is connected.
  • the controller can be implemented as a variety of suitable controllers, such as programmable controllers, computers, and the like.
  • the working pressure P of the variable pump can be detected by various suitable means.
  • the pressure sensor 3 is connected to the oil outlet of the variable pump, that is, the pressure of the oil outlet of the variable pump is used as the working pressure P of the variable pump.
  • the constant power control device further includes a shuttle valve, and the oil outlet and the oil inlet of the variable pump are respectively connected to two inlets of the shuttle valve, The outlet of the shuttle valve is connected to the pressure sensor 3, that is, the larger of the outlet pressure and the inlet pressure of the variable pump as the working pressure of the variable pump.
  • the oil inlet of the displacement control valve block 1 can be connected to an appropriate position according to a specific situation, that is, the pressure source for controlling the displacement of the variable pump can be selected according to specific conditions.
  • the displacement control valve block 1 is connected in series with the oil outlet and displacement control of the variable pump Between the mouths. That is, the oil inlet of the displacement control valve block 1 is connected with the oil outlet of the variable pump, and the oil outlet of the displacement control valve block 1 is connected with the displacement control port of the variable pump, so that the pressure of the outlet of the variable pump is used.
  • a pressure source that controls the displacement of the variable pump is used.
  • the displacement control valve block 1 When the variable pump is used in a closed hydraulic system, the displacement control valve block 1 is connected in series between the oil outlet of the charge pump of the variable pump and the displacement control port of the variable pump. That is, the oil inlet of the displacement control valve block 1 is connected with the oil outlet of the variable pressure pump of the variable pump, and the oil outlet of the displacement control valve block 1 is connected with the displacement control port of the variable pump, so that the charge pump of the variable pump is used.
  • the outlet pressure serves as a pressure source for controlling the displacement of the variable pump.
  • the present invention also provides a concrete pumping device (for example, a concrete pump, a concrete pump truck, etc.), wherein the concrete pumping device includes a constant power control device of a variable pump as described above, A variable pump is used as the main pump of the pumping cylinder of the concrete pumping device.
  • a concrete pumping device for example, a concrete pump, a concrete pump truck, etc.
  • the displacement control valve block 1 is connected in series with the oil outlet of the main pump of the swing cylinder of the concrete pumping device and the variable Between the displacement control ports of the pump. Since the outlet pressure of the main pump of the oscillating cylinder is relatively constant, it is more suitable as a pressure source for controlling the displacement of the variable pump. Of course, it is also possible to use the outlet pressure of the pump with a relatively stable outlet pressure of the concrete pumping device as the pressure source for controlling the displacement of the variable pump.
  • the present invention also provides a constant power control method for a variable pump, wherein the variable pump is provided with a displacement control valve block 1, wherein the variable power control method of the variable pump comprises: a detecting step: detecting The working pressure P of the variable pump; and the controlling step: obtaining the displacement Q required by the variable pump according to the set power N1 and the working pressure P, and representing the displacement Q required by the variable pump A signal is sent to the displacement control valve block 1.
  • the displacement control valve block 1 provided by the variable pump can be used to realize the constant power operation of the variable pump by controlling the displacement of the variable pump without additionally adding a constant power valve block to the variable pump.
  • the set powers N1, N2, and N3 may be plural.
  • the variable pump can be made with the power unit. Or the power operation of the working condition.
  • the working pressure P of the variable pump can be detected by various suitable means.
  • the pressure of the oil outlet of the variable pump is detected as the working pressure of the variable pump.
  • the detecting step detecting and comparing the oil outlet pressure and the inlet pressure of the variable pump, using a larger pressure as the working pressure of the variable pump P.
  • variable pump may further be provided with a constant power valve
  • constant power control method of the variable pump further comprises setting a maximum constant power value of the variable pump through the constant power valve.

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

Abstract

公开了一种混凝土泵送装置及其变量泵的恒功率控制装置。变量泵设置有排量控制阀块(1)。恒功率控制装置包括相互连接的压力传感器(3)和控制器(4)。控制器还与排量控制阀块连接。压力传感器检测变量泵的工作压力(P),并将代表变量泵的工作压力的信号发送给控制器。控制器接收代表变量泵的工作压力的信号,并将代表根据设定功率(N1)和工作压力得到的变量泵所需要的排量(Q)的信号发送给排量控制阀块。上述技术方案采用变量泵自带的排量控制阀块,通过控制变量泵的排量来实现变量泵的恒功率运转,无需为变量泵额外地加装恒功率阀块。

Description

变量泵的恒功率控制装置、 方法以及混凝土泵送装置 技术领域
本发明涉及一种变量泵的恒功率控制装置及方法,本发明还涉及一种具 有该变量泵的恒功率控制装置的混凝土泵送装置。 背景技术
为了使得工程机械平稳作业,有时候需要使得工程机械的变量泵恒功率 运转, 这通常通过为变量泵设置恒功率控制装置来实现。 例如在车载式混凝 土泵或混凝土输送泵车等混凝土泵送装置中, 为了使得混凝土输送连续平稳 并使得混凝土的输送量达到相对最大, 通常需要使得主油泵(即变量泵) 的 工作功率与驱动该变量泵的动力装置的功率相适应, 并让变量泵以该适当的 功率恒功率运转。 在现有的车载式混凝土泵和混凝土输送泵车中, 通常通过 设置控制器并在变量泵上加装恒功率阀块来实现。控制器根据驱动变量泵的 动力装置 (例如电动机或发动机) 的相应功率来调节变量泵的恒功率阀块, 以使得变量泵恒定地以与动力装置的功率相适应的功率运转。但是, 这需要 在变量泵上额外地加装恒功率阀块, 换言之, 必须采用带有恒功率阀块的变 量泵, 从而限制了元件的通用性。 发明内容
本发明的目的是提供一种变量泵的恒功率控制装置及方法,通过该变量 泵的恒功率控制装置及方法,无需采用带有恒功率阀块的变量泵便能够使得 变量泵以恒功率运转, 从而元件通用性较好。
为了实现上述目的, 一方面, 本发明提供了一种变量泵的恒功率控制装 置, 所述变量泵设置有排量控制阀块, 其中, 所述恒功率控制装置包括相互 连接的压力传感器和控制器, 控制器还与排量控制阀块连接; 压力传感器检 测变量泵的工作压力, 并将代表变量泵的工作压力的信号发送给控制器; 控 制器接收代表变量泵的工作压力的信号, 并将代表根据设定功率和所述工作 压力得到的变量泵所需要的排量的信号发送给排量控制阀块。
优选地, 所述控制器包括依次连接的接收模块、 控制模块和发送模块, 接收模块接收代表变量泵的工作压力的信号, 并将该信号发送给控制模块; 控制模块将代表根据所述功率设定值和所述工作压力得到的变量泵所需要 的排量的信号发送给发送模块; 发送模块将代表变量泵所需要的排量的信号 发送给排量控制阀块。
优选地, 所述控制器预设有多个设定功率。
优选地, 所述排量控制阀块为电控式排量控制阀, 所述控制器与所述电 控式排量控制阀的控制口连接。
优选地, 所述排量控制阀块包括液控式排量控制阀和电磁比例减压阀, 所述控制器与所述电磁比例减压阀的控制口连接,所述电磁比例减压阀的输 出口与所述液控式排量控制阀的控制口连接。
优选地, 所述控制器为可编程控制器。
优选地, 所述变量泵用于开式液压系统, 所述压力传感器与所述变量泵 的出油口连接。
优选地, 所述变量泵用于闭式液压系统, 所述恒功率控制装置还包括梭 阀, 所述变量泵的出油口和进油口分别与所述梭阀的两个入口连接, 所述梭 阀的出口与所述压力传感器连接。
优选地, 所述变量泵用于开式液压系统, 所述排量控制阀块串接在所述 变量泵的出油口和排量控制口之间。
优选地, 所述变量泵用于闭式液压系统, 所述排量控制阀块串接在所述 变量泵的补油泵的出油口与所述变量泵的排量控制口之间。 另一方面, 本发明还提供了一种混凝土泵送装置, 其中, 该混凝土泵送 装置包括上述变量泵的恒功率控制装置,所述变量泵作为所述混凝土泵送装 置的泵送油缸的主泵。
优选地, 所述混凝土泵送装置的液压系统为开式液压系统, 所述排量控 制阀块串接在所述混凝土泵送装置的摆动油缸的主泵的出油口与所述变量 泵的排量控制口之间。
还另一方面, 本发明提供了一种变量泵的恒功率控制方法, 所述变量泵 设置有排量控制阀块, 其特征在于, 所述变量泵的恒功率控制方法包括: 检 测步骤: 检测所述变量泵的工作压力; 以及控制步骤: 根据设定功率和所述 工作压力得到所述变量泵所需要的排量, 并将代表所述变量泵所需要的排量 的信号发送给所述排量控制阀块。
优选地, 所述设定功率为多个。
优选地, 所述变量泵用于开式液压系统, 在所述检测步骤中, 检测所述 变量泵的出油口的压力作为所述变量泵的工作压力。
优选地, 所述变量泵用于闭式液压系统, 在所述检测步骤中: 检测并比 较所述变量泵的出油口压力和进油口压力,将较大压力作为所述变量泵的工 作压力。
优选地, 所述变量泵还设置有恒功率阀, 所述变量泵的恒功率控制方法 还包括通过所述恒功率阀设定所述变量泵的最大恒功率值。
通过上述技术方案, 可以采用变量泵自带的排量控制阀块, 通过控制变 量泵的排量来实现变量泵的恒功率运转, 而无需为变量泵额外地加装恒功率 阀块, 从而提高了元件通用性。
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示意性框图;
图 2是根据本发明的另一种实施方式的示意性框图;
图 3是根据本发明的还另一种实施方式的示意性框图。 附图标记说明
1 排量控制阀块 3 压力传感器
4 控制器 P 工作压力
Nl、 N2、 N3 设定功率 Q 排量
41 接收模块 42 控制模块
43 发送模块 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变量泵的恒功率控 制装置, 所述变量泵设置有排量控制阀块 1, 其中, 所述恒功率控制装置包 括相互连接的压力传感器 3和控制器 4,控制器 4还与排量控制阀块 1连接; 压力传感器检测变量泵的工作压力 P, 并将代表变量泵的工作压力 P的信号 发送给控制器 4; 控制器 4接收代表变量泵的工作压力 P的信号, 并将代表 根据设定功率 N1和所述工作压力 P得到的变量泵所需要的排量 Q的信号发 送给排量控制阀块 1。 通过上述技术方案, 可以采用变量泵自带的排量控制阀块 1, 通过控制 变量泵的排量来实现变量泵的恒功率运转, 而无需为变量泵额外地加装恒功 率阀块, 从而提高了元件通用性。
所述控制器 4可以采用各种具体的设置, 例如如图 2所示, 根据本发明 的另一种实施方式,所述控制器 4可以包括依次连接的接收模块 41、控制模 块 42和发送模块 43, 接收模块 41接收代表变量泵的工作压力 P的信号, 并将该信号发送给控制模块 42;控制模块 42将代表根据所述功率设定值 N1 和所述工作压力 P得到的变量泵所需要的排量 Q的信号发送给发送模块 43; 发送模块 43将代表变量泵所需要的排量 Q的信号发送给排量控制阀块 1。
优选地, 如图 3所示, 所述控制器 4预设有多个设定功率 Nl、 N2、 N3 o 从而, 在由双动力或多级动力驱动变量泵的情况下, 或者在不同工况下, 需 要使得变量泵以不同功率运转, 通过选择适当的设定功率, 能够使得变量泵 以与该动力装置或该工况相适应的功率运转。 在这种情况下, 所述控制器还 可以包括输入模块, 可以通过该输入模块输入以在多个设定功率 Nl、 N2、 N3 中选择所需要的设定功率 (例如 N1 ), 并将代表该选中的设定功率的信 号发送给接收模块 41, 接收模块 41接收该代表该选中的设定功率的信号和 上述代表变量泵的工作压力 P的信号, 并将该两种信号发送给控制模块 42; 控制模块 42将代表根据选中的功率设定值和所述工作压力 P得到的变量泵 所需要的排量 Q的信号发送给发送模块 43; 发送模块 43将代表变量泵所需 要的排量 Q的信号发送给排量控制阀块 1。
如上文所述, 通过使所述控制器 4 预设有多个设定功率 Nl、 N2、 N3 便可以使得变量泵以不同的恒功率值运转。 然而, 本发明并不排除恒功率阀 的使用, 所述变量泵的恒功率控制装置还可以再同时设置有恒功率阀, 通过 该恒功率阀为变量泵设置最大恒功率值。 此时, 当变量泵需要以该最大恒功 率值运转时, 恒功率阀起作用, 控制器不起作用; 当变量泵需要以控制器中 预设的其他恒功率值运转时,控制器起作用,恒功率阀不起作用。也就是说, 在现有的预装有恒功率阀的变量泵中, 只能设定一个恒功率值(通过调节恒 功率阀的弹簧设定), 但不能提供两种或两种以上的恒功率值。 为了使这种 现有的变量泵能够以不同的恒功率值运转, 可以额外地设置如上文所述的恒 功率控制装置, 在通过恒功率阀设定最大恒功率值的同时, 通过恒功率控制 装置的控制器预设的一个或多个设定功率(该设定功率值低于通过恒功率阀 设定的最大恒功率值) 来实现变量泵根据需要以不同的恒功率值运转。
所述排量控制阀块 1 可以包括电控式排量控制阀或者液控式排量控制 阀。 例如, 所述排量控制阀块 1可以为电控式排量控制阀, 所述控制器 4可 以与所述电控式排量控制阀的控制口连接; 可选地, 所述排量控制阀块 1可 以包括液控式排量控制阀和电磁比例减压阀,所述控制器 4与所述电磁比例 减压阀的控制口连接,所述电磁比例减压阀的输出口与所述液控式排量控制 阀的控制口连接。
所述控制器可以为各种适当的控制器来实现, 例如可以为可编程控制 器、 计算机等。
所述变量泵的工作压力 P可以通过各种适当的方式来检测。当所述变量 泵用于开式液压系统时, 所述压力传感器 3与所述变量泵的出油口连接, 即 以变量泵的出油口的压力作为变量泵的工作压力 P。 当所述变量泵用于闭式 液压系统时, 所述恒功率控制装置还包括梭阀, 所述变量泵的出油口和进油 口分别与所述梭阀的两个入口连接,所述梭阀的出口与所述压力传感器 3连 接, 即以变量泵的出油口压力和进油口压力中的较大者作为变量泵的工作压 力 。
所述排量控制阀块 1的进油口可以根据具体情况而连接在适当的位置, 即控制变量泵的排量的压力源可以根据具体情况而选择。当所述变量泵用于 开式液压系统时,所述排量控制阀块 1串接在所述变量泵的出油口和排量控 制口之间。 即排量控制阀块 1的进油口与变量泵的出油口连接, 排量控制阀 块 1的出油口与变量泵的排量控制口连接, 从而以变量泵的出油口压力作为 控制变量泵的排量的压力源。
当所述变量泵用于闭式液压系统时,所述排量控制阀块 1串接在所述变 量泵的补油泵的出油口与所述变量泵的排量控制口之间。 即排量控制阀块 1 的进油口与变量泵的补油泵的出油口连接, 排量控制阀块 1的出油口与变量 泵的排量控制口连接,从而以变量泵的补油泵的出油口压力作为控制变量泵 的排量的压力源。
另一方面, 本发明还提供了一种混凝土泵送装置 (例如混凝土输送泵、 混凝土泵车等), 其中, 该混凝土泵送装置包括如上文所述的变量泵的恒功 率控制装置, 所述变量泵作为所述混凝土泵送装置的泵送油缸的主泵。
所述混凝土泵送装置的液压系统为开式液压系统时, 优选地, 所述排量 控制阀块 1串接在所述混凝土泵送装置的摆动油缸的主泵的出油口与所述变 量泵的排量控制口之间。 由于摆动油缸的主泵的出油口压力比较恒定, 从而 比较适合作为控制变量泵的排量的压力源。 当然, 也可以选用混凝土泵送装 置的其他出口压力比较稳定的泵的出口压力作为控制变量泵的排量的压力 源。
还另一方面, 本发明还提供了一种变量泵的恒功率控制方法, 所述变量 泵设置有排量控制阀块 1, 其中, 所述变量泵的恒功率控制方法包括: 检测 步骤: 检测所述变量泵的工作压力 P; 以及控制步骤: 根据设定功率 N1和 所述工作压力 P得到所述变量泵所需要的排量 Q,并将代表所述变量泵所需 要的排量 Q的信号发送给所述排量控制阀块 1。
通过上述技术方案, 可以采用变量泵自带的排量控制阀块 1, 通过控制 变量泵的排量来实现变量泵的恒功率运转, 而无需为变量泵额外地加装恒功 率阀块, 从而提高了元件通用性。 优选地, 所述设定功率 Nl、 N2、 N3可以为多个。 从而, 在由双动力或 多级动力驱动变量泵的情况下, 或者在不同工况下, 需要使得变量泵以不同 功率运转, 通过选择适当的设定功率, 能够使得变量泵以与该动力装置或该 工况相适应的功率运转。
所述变量泵的工作压力 P可以通过各种适当的方式来检测。当所述变量 泵用于开式液压系统时, 在所述检测步骤中, 检测所述变量泵的出油口的压 力作为所述变量泵的工作压力?。 当所述变量泵用于闭式液压系统时, 在所 述检测步骤中: 检测并比较所述变量泵的出油口压力和进油口压力, 将较大 压力作为所述变量泵的工作压力 P。
优选地, 所述变量泵还可以设置有恒功率阀, 所述变量泵的恒功率控制 方法还包括通过所述恒功率阀设定所述变量泵的最大恒功率值。
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

1、 变量泵的恒功率控制装置, 所述变量泵设置有排量控制阀块 (1), 其特征在于, 所述恒功率控制装置包括相互连接的压力传感器 (3) 和控制 器 (4), 控制器 (4) 还与排量控制阀块 (1) 连接;
压力传感器检测变量泵的工作压力(P),并将代表变量泵的工作压力(P) 的信号发送给控制器 (4);
控制器(4)接收代表变量泵的工作压力 (P) 的信号, 并将代表根据设 定功率 (N1) 和所述工作压力 (P) 得到的变量泵所需要的排量 (Q) 的信 号发送给排量控制阀块 (1)。
2、 根据权利要求 1所述的变量泵的恒功率控制装置, 其特征在于, 所 述控制器 (4)包括依次连接的接收模块 (41)、 控制模块 (42) 和发送模块
(43),
接收模块 (41) 接收代表变量泵的工作压力 (P) 的信号, 并将该信号 发送给控制模块 (42);
控制模块(42)将代表根据所述功率设定值(N1)和所述工作压力 (P) 得到的变量泵所需要的排量 (Q) 的信号发送给发送模块 (43);
发送模块 (43) 将代表变量泵所需要的排量 (Q) 的信号发送给排量控 制阀块 (1)。
3、 根据权利要求 1所述的变量泵的恒功率控制装置, 其特征在于, 所 述控制器 (4) 预设有多个设定功率 (Nl, N2, N3)。
4、 根据权利要求 1所述的变量泵的恒功率控制装置, 其特征在于, 所 述排量控制阀块 (1) 为电控式排量控制阀, 所述控制器 (4) 与所述电控式 排量控制阀的控制口连接。
5、 根据权利要求 1所述的变量泵的恒功率控制装置, 其特征在于, 所 述排量控制阀块 (1 ) 包括液控式排量控制阀和电磁比例减压阀, 所述控制 器 (4) 与所述电磁比例减压阀的控制口连接, 所述电磁比例减压阀的输出 口与所述液控式排量控制阀的控制口连接。
6、 根据权利要求 1所述的变量泵的恒功率控制装置, 其特征在于, 所 述控制器为可编程控制器。
7、 根据权利要求 1所述的变量泵的恒功率控制装置, 其特征在于, 所 述变量泵用于开式液压系统, 所述压力传感器 (3 ) 与所述变量泵的出油口 连接。
8、 根据权利要求 1所述的变量泵的恒功率控制装置, 其特征在于, 所 述变量泵用于闭式液压系统, 所述恒功率控制装置还包括梭阀, 所述变量泵 的出油口和进油口分别与所述梭阀的两个入口连接,所述梭阀的出口与所述 压力传感器 (3 ) 连接。
9、 根据权利要求 1所述的变量泵的恒功率控制装置, 其特征在于, 所 述变量泵用于开式液压系统, 所述排量控制阀块 (1 ) 串接在所述变量泵的 出油口和排量控制口之间。
10、 根据权利要求 1所述的变量泵的恒功率控制装置, 其特征在于, 所 述变量泵用于闭式液压系统, 所述排量控制阀块 (1 ) 串接在所述变量泵的 补油泵的出油口与所述变量泵的排量控制口之间。
11、 一种混凝土泵送装置, 其特征在于, 该混凝土泵送装置包括根据权 利要求 1至 10中任意一项所述的变量泵的恒功率控制装置, 所述变量泵作 为所述混凝土泵送装置的泵送油缸的主泵。
12、 根据权利要求 11所述的混凝土泵送装置, 其特征在于, 所述混凝 土泵送装置的液压系统为开式液压系统, 所述排量控制阀块 (1 ) 串接在所 述混凝土泵送装置的摆动油缸的主泵的出油口与所述变量泵的排量控制口 之间。
13、 变量泵的恒功率控制方法, 所述变量泵设置有排量控制阀块 (1 ), 其特征在于, 所述变量泵的恒功率控制方法包括:
检测步骤: 检测所述变量泵的工作压力 (P); 以及
控制步骤: 根据设定功率 (N1 ) 和所述工作压力 (P) 得到所述变量泵 所需要的排量 (Q), 并将代表所述变量泵所需要的排量 (Q) 的信号发送给 所述排量控制阀块 (1 )。
14、 根据权利要求 13所述的变量泵的恒功率控制方法, 其特征在于, 所述设定功率 (Nl, N2, N3 ) 为多个。
15、 根据权利要求 13所述的变量泵的恒功率控制方法, 其特征在于, 所述变量泵用于开式液压系统, 在所述检测步骤中, 检测所述变量泵的出油 口的压力作为所述变量泵的工作压力 (P)。
16、 根据权利要求 13所述的变量泵的恒功率控制方法, 其特征在于, 所述变量泵用于闭式液压系统, 在所述检测步骤中: 检测并比较所述变量泵 的出油口压力和进油口压力, 将较大压力作为所述变量泵的工作压力 (P)。
17、 根据权利要求 13-16中任意一项所述的变量泵的恒功率控制方法, 其特征在于, 所述变量泵还设置有恒功率阀, 所述变量泵的恒功率控制方法 还包括通过所述恒功率阀设定所述变量泵的最大恒功率值。
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Cited By (1)

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CN105626495A (zh) * 2014-11-28 2016-06-01 中联重科股份有限公司 一种泵送设备控制方法、控制装置及混凝土泵送设备

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