WO2021114669A1 - 一种动臂液压系统 - Google Patents

一种动臂液压系统 Download PDF

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Publication number
WO2021114669A1
WO2021114669A1 PCT/CN2020/103555 CN2020103555W WO2021114669A1 WO 2021114669 A1 WO2021114669 A1 WO 2021114669A1 CN 2020103555 W CN2020103555 W CN 2020103555W WO 2021114669 A1 WO2021114669 A1 WO 2021114669A1
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Prior art keywords
oil
boom
oil suction
valve
passage
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PCT/CN2020/103555
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English (en)
French (fr)
Inventor
何清华
方庆琯
刘昌盛
吴民旺
李赛白
戴鹏
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山河智能装备股份有限公司
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Publication of WO2021114669A1 publication Critical patent/WO2021114669A1/zh

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    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means

Definitions

  • the invention relates to the technical field of engineering machinery, and in particular to a boom hydraulic system.
  • the open hydraulic pump is applied to an open hydraulic system with multiple hydraulic actuators.
  • the hydraulic return pressure of the return cavity of most of the actuators is less than 1Mpa, which is zero pressure return; but at least one of the actuator’s return chambers will produce a hydraulic return pressure of about 10Mpa, which is Medium pressure oil return.
  • this part of the medium pressure oil return is released back to the normal pressure oil tank like other zero pressure oil returns.
  • the hydraulic energy of the medium-pressure oil return becomes heat energy and is consumed by the increase in oil temperature, resulting in the loss of hydraulic energy.
  • the boom cylinder 8 of the hydraulic excavator provides the main power for lifting and lowering the excavating boom.
  • the hydraulic pressure oil output by the first main pump 40 and the second main pump 50 is controlled by the first boom link 91 and the second boom link 92 of the multi-way valve 9 to drive the extension and contraction of the piston rod of the boom cylinder 8
  • the boom lifts the load and lifts; when the piston rod retracts, the boom drops and the load drops.
  • the following methods are currently used for recycling.
  • One is to charge this part of the higher pressure return oil flow through the hydraulic transformer and then charge it into the accumulator for storage, and release it for use when needed.
  • the second is to use the higher-pressure return oil flow to drive the hydraulic motor, and then use the hydraulic motor to drive the generator to generate electricity, which is recycled in the form of electrical energy.
  • the third is to use the higher-pressure return oil flow to drive the hydraulic motor, and then couple the torque and speed of the hydraulic motor with the torque and speed of the motor that drives the hydraulic pump, and recycle it in the form of mechanical energy.
  • the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a boom hydraulic system which has a simple structure and can efficiently recover a higher-pressure oil return flow.
  • the present invention adopts the following technical solutions:
  • a boom hydraulic system comprising an oil tank, a hydraulic pump, a boom cylinder, a multi-way valve and a reversing valve.
  • the hydraulic pump has a sealed working cavity, and an oil outlet channel and a first oil suction channel respectively communicating with the sealed working cavity And the second oil suction passage;
  • the oil outlet passage is connected with the oil inlet cavity of the multi-way valve,
  • the first oil suction passage is connected with the oil tank, and the second oil suction passage passes through one of the oil passages of the reversing valve and the boom cylinder.
  • the rod cavity is connected.
  • the multi-way valve is provided with a first boom linkage and a second boom linkage.
  • the working oil port of the first boom linkage is connected to the rodless chamber of the boom cylinder through another oil path of the reversing valve. Connected, the working oil port of the second boom link is in communication with the rod cavity of the boom cylinder.
  • the reversing valve makes the second oil suction channel open, and the return oil from the lower chamber of the boom cylinder (the rodless chamber) directly enters the sealing work of the hydraulic pump through the reversing valve After the pump seal working cavity is compressed, it becomes high-pressure oil, which is output to the multi-way valve through the oil outlet channel.
  • the high-pressure oil enters the rod cavity of the boom cylinder through the operation of the second boom of the multi-way valve, and under the combined action of the load gravity, the boom is lowered.
  • the medium-pressure return oil in the lower cavity of the boom cylinder is directly recycled by the hydraulic pump, and the recovery efficiency is high; and the energy-saving hydraulic system adopting the direct recovery form can hardly modify the original hydraulic system (only the original open hydraulic The pump is replaced with the open hydraulic pump of the present invention, and the oil circuit of the medium pressure oil return can be slightly modified), the cost is low, and the superiority is obvious.
  • the system In order to detect the pressure in the rod chamber and the rodless chamber of the boom, the system also includes a pilot oil source, and a first pilot control valve and a second pilot control valve respectively communicating with the pilot oil source.
  • the first pilot control valve and the second pilot control valve The control oil port of a boom linkage is connected, the pipeline connecting the first pilot control valve and the first boom is provided with a first pressure sensor, and the second pilot control valve is connected to the control oil of the second boom.
  • the pipeline connecting the second pilot control valve and the second boom is provided with a second pressure sensor.
  • a third pressure sensor is provided on the pipeline connecting the rod cavity of the second boom linkage and the boom cylinder, and a fourth pressure sensor is provided on the pipeline connecting the reversing valve and the rodless cavity of the boom cylinder.
  • control end of the reversing valve is electrically connected with a controller.
  • the first oil suction passage and the second oil suction passage are both connected to the sealing working chamber through a gating module, and the gating module is used to control the on-off of the first oil suction passage and the sealing working chamber, and to control the second oil suction passage and the seal On-off of the working chamber.
  • the gate module is composed of a hydraulically controlled check valve or a reversing valve that can switch the oil circuit on and off.
  • the check valve or the reversing valve can be a two-way cartridge valve type or a spool valve type.
  • the one-way valve or the reversing valve can be integrated and installed in an oil circuit block to form a structural module; it can also be installed in the appropriate positions of the two oil suction channels to form a functional module.
  • the gate module is a reversing valve, the reversing valve is in communication with the sealed working chamber, an oil passage of the reversing valve is in communication with the first oil suction passage, and the other oil passage of the reversing valve is connected to the second The oil suction channel is connected; or
  • the gating module includes a first one-way valve and a second one-way valve.
  • the first oil suction passage is connected to the sealing working chamber through the first one-way valve
  • the second oil suction passage is connected to the sealing work chamber through the second one-way valve.
  • the working chambers are connected.
  • the open hydraulic pump has an oil distribution mechanism, the oil distribution mechanism has an oil suction window and an oil pressure window, the gating module and the sealed working chamber are communicated through the oil suction window, and the oil outlet channel and the sealed working chamber pass through The pressure oil window is in communication.
  • the first oil suction passage is in communication with an oil suction port, and the second oil suction passage is in communication with another oil suction port; the oil outlet passage is in communication with an oil outlet; or
  • the first oil suction passage and the second oil suction passage are both connected with an oil suction port, and the oil outlet passage is connected with an oil outlet.
  • the two oil suction passages can be fitted with a higher pressure-resistant pipe (that is, the second oil suction passage) in the original suction cavity (that is, the first oil suction passage),
  • a nested double-channel structure is formed with a large channel (0 pressure) and a small channel (medium pressure).
  • the original oil suction cavity can be modified into a parallel double channel structure; the pump body can also be modified to add a medium pressure channel.
  • the hydraulic pump also has an oil drain area and an oil seal area, and the second oil suction passage is not connected to the oil drain area and the oil seal area.
  • the invention can directly recycle the higher pressure return oil flow of the boom cylinder in the form of hydraulic energy, with high recovery efficiency; and the energy-saving hydraulic system adopting the direct recovery form can hardly modify the original hydraulic system (only need to change the original hydraulic system).
  • the open hydraulic pump is replaced with the open hydraulic pump of the present invention, and the oil circuit of the medium pressure oil return can be slightly modified), with low cost and obvious superiority.
  • Figure 1 is a schematic diagram of a conventional excavating boom hydraulic system.
  • Figure 2 is a schematic diagram of the boom hydraulic system of the present invention.
  • the boom hydraulic system of this embodiment includes an oil tank 10, a hydraulic pump 1, a boom cylinder 8, a multi-way valve 9, a reversing valve 4, a controller 5, a pilot oil source, and a pilot oil source.
  • the first pilot control valve 2 and the second pilot control valve 3 communicated with the oil source.
  • the pump body of the hydraulic pump is provided with a sealed working chamber 11, an oil pressure window 17, an oil suction window 16, an oil outlet passage 12, a first oil suction passage 13, a second oil suction passage 14, an oil suction port 19, and an oil outlet 18.
  • the oil outlet 18, the oil outlet passage 12, the oil pressure window 17 and the sealed working chamber 11 are connected in sequence.
  • the oil suction window 16 is in communication with the sealed working chamber 11.
  • the first oil suction passage 13 and the second oil suction passage 14 are both communicated with the oil suction window 16 through a gate module 15.
  • the gate module 15 is a reversing valve, and the reversing valve is connected to the seal
  • the working chamber 11 is in communication, an oil passage of the reversing valve is in communication with the first oil suction passage 13, and the other oil passage of the reversing valve is in communication with the second oil suction passage 14.
  • Both the first oil suction passage 13 and the second oil suction passage 14 communicate with the oil suction port 19.
  • the hydraulic pump 1 also has an oil drain area and an oil seal area, and the second oil suction passage 14 is not connected to the oil drain area and the oil seal area.
  • the oil outlet passage 12 communicates with the oil inlet cavity of the multi-way valve 9, the first oil suction passage 13 communicates with the oil tank 10, and the second oil suction passage 14 communicates with the rodless cavity of the boom cylinder 8 through one of the oil passages of the reversing valve 4 ,
  • the multi-way valve 9 is provided with a first boom linkage 91 and a second boom linkage 92.
  • the working oil port of the first boom linkage 91 passes through the other oil path of the reversing valve 4 and the rodless boom cylinder 8
  • the cavity is connected, the working oil port of the second boom link 92 is communicated with the rod cavity of the boom cylinder 8, and the control end of the reversing valve 4 is electrically connected with the controller 5.
  • the first pilot control valve 2 is connected to the control oil port of the first boom link 91.
  • the pipeline connecting the first pilot control valve 2 and the first boom link 91 is provided with a first pressure sensor 6 and a second pilot control valve 3 Connected to the control oil port of the second boom link 92, a second pressure sensor 7 is provided on the pipeline connecting the second pilot control valve 3 and the second boom link 92.
  • a third pressure sensor 20 is provided on the pipeline connecting the second boom linkage 92 with the rod cavity of the boom cylinder 8 and a fourth pressure sensor 20 is provided on the pipeline connecting the reversing valve 4 and the rodless cavity of the boom cylinder 8. Pressure sensor 30.
  • the strobe module 15 opens the first oil suction channel 13, and the electromagnet of the reversing valve 4 is de-energized.
  • the hydraulic pump 1 sucks oil from the oil tank 10 and enters the oil suction window 7 of the oil distribution mechanism through the first oil suction channel 3. After the pump seal working chamber 1 is compressed, it becomes high-pressure oil. Output to multi-way valve 9.
  • the multi-way valve second boom operating link 92 is in the left position at this time, and the high-pressure oil enters the lower chamber of the boom cylinder 8 through the multi-way valve second boom operating link 92 to raise the boom, and the upper chamber of the boom cylinder returns oil
  • the second boom operating link 92 through the multi-way valve returns to the fuel tank 10.
  • the strobe module 15 opens the second oil suction channel 14, and the controller 5 outputs a signal to make the reversing valve The electromagnet of 4 is energized.
  • the oil return from the lower chamber of the boom cylinder directly enters the suction port 19 of the hydraulic pump of this embodiment through the reversing valve 4, and enters the oil distribution mechanism suction window 16 through the second oil suction channel 14. After the pump seal working chamber 11 is compressed, it becomes high pressure The oil is output from the oil distribution mechanism pressure oil window 17 to the multi-way valve 9 through the oil outlet channel 14.
  • the multi-way valve second boom operating link 92 is now in the right position, and the high-pressure oil enters the upper cavity of the boom cylinder 8 through the multi-way valve second boom operating link 92, and under the combined action of the load gravity, the boom is lowered . In this way, the medium pressure return oil in the lower cavity of the boom cylinder is directly recycled by the hydraulic pump 1 of this embodiment.

Abstract

一种动臂液压系统，包括油箱(10)、液压泵(1)、动臂油缸(8)、多路阀(9)和换向阀(4)，液压泵具有密封工作腔(11)，以及分别与密封工作腔连通的出油通道(12)、第一吸油通道(13)和第二吸油通道(14)；出油通道(12)与多路阀(9)的进油腔连通，第一吸油通道(13)与油箱(10)连通，第二吸油通道(14)通过换向阀(4)的其中一油路与动臂油缸(8)的无杆腔连通，多路阀(9)中设有第一动臂联(91)和第二动臂联(92)，第一动臂联(91)的工作油口通过换向阀(4)的另一油路与动臂油缸(8)的无杆腔连通，第二动臂联(92)的工作油口与动臂油缸(8)的有杆腔连通。动臂油缸下腔的中压回油可被液压泵直接回收利用，回收效率高；而且成本低，优势明显。

Description

一种动臂液压系统 技术领域
本发明涉及工程机械技术领域，尤其涉及一种动臂液压系统。
背景技术
开式液压泵为应用于具有多个液压执行元件的开式液压系统。这多个液压执行元件中，大部分执行元件回油腔的液压回油压力不足1Mpa，属零压回油；但至少有一个执行元件的回油腔会产生10Mpa左右的液压回油压力，属中压回油。通常的开式液压系统中，这部分中压回油和其它零压回油一样，被释放回常压油箱中。中压回油具有的液压能变成热能消耗于油温升高，造成了液压能量的损失。
如图1所示，为常规挖掘机动臂原理。液压挖掘机的动臂油缸8提供了挖掘机动臂举升和落下的主要动力。液压第一主泵40和第二主泵50输出的压力油经过多路阀9的第一动臂联91和第二动臂联92的控制，驱动动臂油缸8活塞杆的伸出和缩回，活塞杆伸出时，动臂抬高负载举升；活塞杆缩回时，动臂落下负载下降。负载举升时，液压力对负载作功，使负载势能增加；动臂落下负载下降时，这部分增加的势能会变成动臂液压缸回油腔(大腔)液压油的压力能，使大腔回油压力升高到10Mpa左右。大腔回油经过多路阀9的动臂联节流口被释放回油箱，这些压力能就变成热能浪费了。
为了利用这部分中压(10Mpa左右)回油的液压能，目前采用的回收利用方法有以下几种。其一是将这部分较高压力的回油流量通过液压变压器后充入蓄能器储存，并可在需要时释放使用。其二是将该较高压力的回油流量用于驱动液压马达，再用液压马达驱动发电机发电，以电能方式回收利用。其三是将该较高压力的回油流量用于驱动液压马达，再将液压马达输出的转矩、转速与驱动液压泵的电动机的转矩、转速耦合，以机械能的方式回收利用。这些回收利用方法都涉及压力匹配和转速匹配，需要实时进行液压马达或液压变压器排量的调节，需要配置复杂的液压控制阀组及电控传感系统。这些回收利用方法除了成本较高、调节困难以外，还由于回收的中压回油流经的元件较多且流道复杂而会产生较大的压力损失，回收利用的效率不高。
发明内容
本发明要解决的技术问题是克服现有技术的不足，提供一种结构简单、可将较高压力的回油流量高效回收的动臂液压系统。
为解决上述技术问题，本发明采用以下技术方案：
一种动臂液压系统，包括油箱、液压泵、动臂油缸、多路阀和换向阀，所述液压泵具有密封工作腔，以及分别与密封工作腔连通的出油通道、第一吸油通道和第二吸油通道；所述 出油通道与多路阀的进油腔连通，所述第一吸油通道与油箱连通，第二吸油通道通过换向阀的其中一油路与动臂油缸的无杆腔连通，所述多路阀中设有第一动臂联和第二动臂联，第一动臂联的工作油口通过换向阀的另一油路与动臂油缸的无杆腔连通，第二动臂联的工作油口与动臂油缸的有杆腔连通。
当动臂油缸下腔压力为高压(大于3Mpa)时，换向阀换向使第二吸油通道开通，动臂缸下腔(无杆腔)回油经换向阀直接进入液压泵的密封工作腔，在泵密封工作腔被压缩后，成为高压油，经出油通道输出到多路阀。高压油经多路阀第二动臂操作联进入动臂油缸的有杆腔，在负载重力的共同作用下，使动臂下降。如此，动臂缸下腔的中压回油被液压泵直接回收利用，回收效率高；而且采用该直接回收形式的节能液压系统对原液压系统可几乎不做改动(只需将原开式液压泵更换为本发明的开式液压泵，并对中压回油的油路略作改动即可)，成本低，优越性明显。
作为上述技术方案的进一步改进：
为检测动臂有杆腔和无杆腔压力，该系统还包括先导油源，以及分别与先导油源连通的第一先导控制阀和第二先导控制阀，所述第一先导控制阀与第一动臂联的控制油口连接，所述第一先导控制阀与第一动臂联连通的管路上设有第一压力传感器，所述第二先导控制阀与第二动臂联的控制油口连接，所述第二先导控制阀与第二动臂联连通的管路上设有第二压力传感器。
所述第二动臂联与动臂油缸的有杆腔连接的管路上设有第三压力传感器，所述换向阀与动臂油缸的无杆腔连通的管路上设有第四压力传感器。
为实现换向阀换向，所述换向阀的控制端与一控制器电连接。
所述第一吸油通道和第二吸油通道均通过选通模块与密封工作腔相连，所述选通模块用于控制第一吸油通道与密封工作腔的通断，以及控制第二吸油通道与密封工作腔的通断。
优选选通模块由可实现油路通断切换的液控单向阀或换向阀组成，单向阀或换向阀可以是二通插装阀型，也可以是滑阀型。单向阀或换向阀可以集成安装在一个油路块中，形成一个结构模块；也可分别安装在两个吸油通道的适当位置，构成功能模块。
所述选通模块为换向阀，所述换向阀与密封工作腔连通，所述换向阀的一油路与第一吸油通道连通，所述换向阀的另一油路与第二吸油通道连通；或
所述选通模块包括第一单向阀和第二单向阀，所述第一吸油通道通过第一单向阀与密封工作腔相连，所述第二吸油通道通过第二单向阀与密封工作腔相连。
所述开式液压泵具有配油机构，所述配油机构具有吸油窗和压油窗，所述选通模块和密封工作腔通过所述吸油窗连通，所述出油通道和密封工作腔通过所述压油窗连通。
所述第一吸油通道与一吸油口连通，所述第二吸油通道与另一吸油口连通；所述出油通道与一出油口连通；或
所述第一吸油通道和第二吸油通道均与一吸油口连通，所述出油通道与一出油口连通。
共用一个设置在泵体上的吸油口时，两个吸油通道可以在原吸油腔(即所述的第一吸油通道)中套装一个耐较高压力的管道(即所述的第二吸油通道)，形成大通道(0压)套小通道(中压)的嵌套式双通道结构。在泵体上为每个通道各设置一个吸油口时，可将原吸油腔改制为并列的双通道结构；还可对泵体进行改制，增加一个中压通道。
所述液压泵还具有泄油区和油封区，所述第二吸油通道与泄油区和油封区均不连通。
与现有技术相比，本发明的优点在于：
本发明可将动臂油缸较高压力的回油流量以液压能形式直接回收利用，回收效率高；而且采用该直接回收形式的节能液压系统对原液压系统可几乎不做改动(只需将原开式液压泵更换为本发明的开式液压泵，并对中压回油的油路略作改动即可)，成本低，优越性明显。
附图说明
图1为常规挖掘机动臂液压系统原理图。
图2为本发明的动臂液压系统的原理图。
图例说明：1、液压泵；2、第一先导控制阀；3、第二先导控制阀；4、换向阀；5、控制器；6、第一压力传感器；7、第二压力传感器；8、动臂油缸；9、多路阀；91、第一动臂联；92、第二动臂联；10、油箱；11、密封工作腔；12、出油通道；13、第一吸油通道；14、第二吸油通道；15、选通模块；16、吸油窗；17、压油窗；18、出油口；19、吸油口；20、第三压力传感器；30、第四压力传感器。
具体实施方式
以下结合具体优选的实施例对本发明作进一步描述，但并不因此而限制本发明的保护范围。
实施例：
如图2所示，本实施例的动臂液压系统，包括油箱10、液压泵1、动臂油缸8、多路阀9、换向阀4、控制器5、先导油源、以及分别与先导油源连通的第一先导控制阀2和第二先导控制阀3。
液压泵的泵体中开设有密封工作腔11、压油窗17、吸油窗16、出油通道12、第一吸油通道13、第二吸油通道14、吸油口19和出油口18。出油口18、出油通道12、压油窗17和密封工作腔11依次连通。吸油窗16与密封工作腔11连通，第一吸油通道13和第二吸油通道14均通过一选通模块15与吸油窗16连通，其中，选通模块15为换向阀，换向阀与密封 工作腔11连通，换向阀的一油路与第一吸油通道13连通，换向阀的另一油路与第二吸油通道14连通。第一吸油通道13和第二吸油通道14均与吸油口19连通。
此外，液压泵1还具有泄油区和油封区，第二吸油通道14与泄油区和油封区均不连通。
出油通道12与多路阀9的进油腔连通，第一吸油通道13与油箱10连通，第二吸油通道14通过换向阀4的其中一油路与动臂油缸8的无杆腔连通，多路阀9中设有第一动臂联91和第二动臂联92，第一动臂联91的工作油口通过换向阀4的另一油路与动臂油缸8的无杆腔连通，第二动臂联92的工作油口与动臂油缸8的有杆腔连通，换向阀4的控制端与控制器5电连接。
第一先导控制阀2与第一动臂联91的控制油口连接，第一先导控制阀2与第一动臂联91连通的管路上设有第一压力传感器6，第二先导控制阀3与第二动臂联92的控制油口连接，第二先导控制阀3与第二动臂联92连通的管路上设有第二压力传感器7。
此外，第二动臂联92与动臂油缸8的有杆腔连接的管路上设有第三压力传感器20，换向阀4与动臂油缸8的无杆腔连通的管路上设有第四压力传感器30。
参照图2，当传感器6检测到第一先导控制阀2与多路阀9之间油路上的先导控制油为高压(大于3Mpa)且传感器7检测到第二先导控制阀3与多路阀9之间油路上的先导控制油为0压(小于1Mpa)时，选通模块15开通第一吸油通道13，换向阀4的电磁铁断电。液压泵1从油箱10中吸油，经第一吸油通道3进入配油机构吸油窗7，在泵密封工作腔1被压缩后，成为高压油，从配油机构压油窗8经出油口6输出到多路阀9。多路阀第二动臂操作联92此时在左位，高压油经多路阀第二动臂操作联92进入动臂油缸8的下腔，使动臂上升，动臂缸上腔回油经多路阀第二动臂操作联92回油箱10。
当传感器6检测到第一先导控制阀2与多路阀9之间油路上的先导控制油为0压(小于1Mpa)且传感器7检测到第二先导控制阀3与多路阀9之间油路上的先导控制油为为高压(大于3Mpa)，且第四传感器30检测到动臂油缸下腔压力大于3Mpa时，选通模块15开通第二吸油通道14，控制器5输出信号使换向阀4的电磁铁通电。动臂缸下腔回油经换向阀4直接进入本实施例的液压泵吸油口19，经第二吸油通道14进入配油机构吸油窗16，在泵密封工作腔11被压缩后，成为高压油，从配油机构压油窗17经出油通道14输出到多路阀9。多路阀第二动臂操作联92此时在右位，高压油经多路阀第二动臂操作联92进入动臂油缸8的上腔，在负载重力的共同作用下，使动臂下降。如此，动臂缸下腔的中压回油被本实施例的液压泵1直接回收利用了。
以上所述，仅是本申请的较佳实施例，并非对本申请做任何形式的限制，虽然本申请以 较佳实施例揭示如上，然而并非用以限制本申请，任何熟悉本专业的技术人员，在不脱离本申请技术方案的范围内，利用上述揭示的技术内容做出些许的变动或修饰均等同于等效实施案例，均属于技术方案范围内。

Claims (9)

  1. 一种动臂液压系统，其特征在于，包括油箱(10)、液压泵(1)、动臂油缸(8)、多路阀(9)和换向阀(4)，所述液压泵(1)具有密封工作腔(11)，以及分别与密封工作腔(11)连通的出油通道(12)、第一吸油通道(13)和第二吸油通道(14)；所述出油通道(12)与多路阀(9)的进油腔连通，所述第一吸油通道(13)与油箱(10)连通，第二吸油通道(14)通过换向阀(4)的其中一油路与动臂油缸(8)的无杆腔连通，所述多路阀(9)中设有第一动臂联(91)和第二动臂联(92)，第一动臂联(91)的工作油口通过换向阀(4)的另一油路与动臂油缸(8)的无杆腔连通，第二动臂联(92)的工作油口与动臂油缸(8)的有杆腔连通。
  2. 根据权利要求1所述的动臂液压系统，其特征在于，还包括先导油源，以及分别与先导油源连通的第一先导控制阀(2)和第二先导控制阀(3)，所述第一先导控制阀(2)与第一动臂联(91)的控制油口连接，所述第一先导控制阀(2)与第一动臂联(91)连通的管路上设有第一压力传感器(6)，所述第二先导控制阀(3)与第二动臂联(92)的控制油口连接，所述第二先导控制阀(3)与第二动臂联(92)连通的管路上设有第二压力传感器(7)。
  3. 根据权利要求2所述的动臂液压系统，其特征在于，所述第二动臂联(92)与动臂油缸(8)的有杆腔连接的管路上设有第三压力传感器(20)，所述换向阀(4)与动臂油缸(8)的无杆腔连通的管路上设有第四压力传感器(30)。
  4. 根据权利要求1所述的动臂液压系统，其特征在于，所述换向阀(4)的控制端与一控制器(5)电连接。
  5. 根据权利要求1-4任一项所述的动臂液压系统，其特征在于，所述第一吸油通道(13)和第二吸油通道(14)均通过选通模块(15)与密封工作腔(11)相连，所述选通模块(15)用于控制第一吸油通道(13)与密封工作腔(11)的通断，以及控制第二吸油通道(14)与密封工作腔(11)的通断。
  6. 根据权利要求5所述的动臂液压系统，其特征在于，所述选通模块(15)为换向阀，所述换向阀与密封工作腔(11)连通，所述换向阀的一油路与第一吸油通道(13)连通，所述换向阀的另一油路与第二吸油通道(14)连通；或
    所述选通模块(15)包括第一单向阀和第二单向阀，所述第一吸油通道(13)通过第一单向阀与密封工作腔(11)相连，所述第二吸油通道(14)通过第二单向阀与密封工作腔(11)相连。
  7. 根据权利要求5所述的动臂液压系统，其特征在于，所述开式液压泵具有配油机构，所述配油机构具有吸油窗(16)和压油窗(17)，所述选通模块(15)和密封工作腔(11)通 过所述吸油窗(16)连通，所述出油通道(12)和密封工作腔(11)通过所述压油窗(17)连通。
  8. 根据权利要求1-4任一项所述的动臂液压系统，其特征在于，所述第一吸油通道(13)与一吸油口连通，所述第二吸油通道(14)与另一吸油口连通；所述出油通道(12)与一出油口(18)连通；或
    所述第一吸油通道(13)和第二吸油通道(14)均与一吸油口(19)连通，所述出油通道(12)与一出油口(18)连通。
  9. 根据权利要求1-4任一项所述的动臂液压系统，其特征在于，所述液压泵(1)还具有泄油区和油封区，所述第二吸油通道(14)与泄油区和油封区均不连通。
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