CN107013517A - Method for reducing throttling loss of hydraulic system - Google Patents

Method for reducing throttling loss of hydraulic system Download PDF

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Publication number
CN107013517A
CN107013517A CN201610057523.9A CN201610057523A CN107013517A CN 107013517 A CN107013517 A CN 107013517A CN 201610057523 A CN201610057523 A CN 201610057523A CN 107013517 A CN107013517 A CN 107013517A
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valve
hydraulic
way throttle
throttle valve
way
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董喜荣
董文广
李柏安
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
    • 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
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps

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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

本发明提供一种降低液压系统节流损失的方法，液压控制系统包括液压缸、单向节流阀、伺服滑阀、液控单向阀、变量液压泵、定量液压马达、换向阀、单向阀、阻尼孔、压力油及回油管路。换向阀Ⅰ处于右位，液压缸活塞杆伸出，当单向节流阀Ⅰ两端压差高或低于伺服滑阀Ⅱ设定值P0时，单向节流阀Ⅰ两端压差控制伺服滑阀Ⅱ及变量液压泵，调节定量液压马达转速及单向节流阀Ⅰ流量，使单向节流阀Ⅰ两端的压差等于P0，伺服滑阀Ⅱ不动作，进入稳定状态。换向阀Ⅰ处于左位，单向节流阀Ⅱ两端压差控制伺服滑阀Ⅰ及变量液压泵Ⅱ，调节定量液压马达Ⅱ转速，使通过单向节流阀Ⅱ的流量恒定。本发明可有效降低液压系统调速过程中的节流损失，极大节省能源，延长油液寿命。

The invention provides a method for reducing the throttling loss of a hydraulic system. The hydraulic control system includes a hydraulic cylinder, a one-way throttle valve, a servo slide valve, a hydraulically controlled one-way valve, a variable hydraulic pump, a quantitative hydraulic motor, a reversing valve, a single Directional valve, orifice, pressure oil and oil return pipeline. The reversing valve I is in the right position, and the piston rod of the hydraulic cylinder is stretched out. When the pressure difference between the two ends of the one-way throttle valve I is higher than or lower than the set value P 0 of the servo slide valve II, the pressure difference between the two ends of the one-way throttle valve I Differential control of the servo slide valve II and the variable hydraulic pump, adjust the speed of the quantitative hydraulic motor and the flow rate of the one-way throttle valve I, so that the pressure difference between the two ends of the one-way throttle valve I is equal to P 0 , the servo slide valve II does not move, and enters a stable state . The reversing valve I is in the left position, and the pressure difference between the two ends of the one-way throttle valve II controls the servo slide valve I and the variable hydraulic pump II, and adjusts the speed of the quantitative hydraulic motor II to keep the flow through the one-way throttle valve II constant. The invention can effectively reduce the throttling loss in the speed regulation process of the hydraulic system, greatly save energy and prolong the service life of the oil.

Description

一种降低液压系统节流损失的方法A Method to Reduce Throttle Loss of Hydraulic System

技术领域technical field

本发明属于液压系统控制领域，尤其涉及一种用于降低液压系统节流损失的方法。The invention belongs to the field of hydraulic system control, in particular to a method for reducing throttling loss of a hydraulic system.

背景技术Background technique

热轧带钢厂的液压系统采用节流方法来调整执行元件的速度，以满足工艺要求。目前，液压系统通常是由液压缸、2个单向节流阀、2个液控单向阀、2个换向阀以及压力油管路、回油管路组成。在节流调速过程中，大量的压力势能转变为热能，不仅造成能源的浪费，而且加快了油液的劣化进程。The hydraulic system of the hot strip mill adopts the throttling method to adjust the speed of the actuator to meet the process requirements. At present, the hydraulic system is usually composed of a hydraulic cylinder, 2 one-way throttle valves, 2 hydraulic control check valves, 2 reversing valves, pressure oil pipelines, and oil return pipelines. In the process of throttling and speed regulation, a large amount of pressure potential energy is converted into heat energy, which not only causes waste of energy, but also accelerates the deterioration process of oil.

以液压缸活塞杆伸出为例，液压系统调速回路的工作过程为：换向阀Ⅰ换向处于右位，压力油进入液控单向阀Ⅱ的控制腔，使液控单向阀Ⅱ处于直通状态。换向阀Ⅱ换向处于右位，压力油经换向阀Ⅱ、液控单向阀Ⅰ、单向节流阀Ⅱ中的单向阀进入液压缸的活塞腔，液压缸有杆腔中的油液经单向节流阀Ⅰ中的节流阀、液控单向阀Ⅱ进入换向阀Ⅱ回油箱。单向节流阀Ⅰ调定液压缸的速度，其压差损失在6～10MPa，节流损失很大。Taking the extension of the piston rod of the hydraulic cylinder as an example, the working process of the speed control circuit of the hydraulic system is as follows: the reversing valve I is in the right position, and the pressure oil enters the control chamber of the hydraulic control check valve II, so that the hydraulic control check valve II in a pass-through state. The reversing valve II is in the right position, and the pressure oil enters the piston cavity of the hydraulic cylinder through the one-way valve in the reversing valve II, the hydraulic control check valve I, and the one-way throttle valve II, and the oil in the rod cavity of the hydraulic cylinder The oil enters the reversing valve II and returns to the oil tank through the throttle valve in the one-way throttle valve I and the hydraulic control check valve II. The one-way throttle valve Ⅰ adjusts the speed of the hydraulic cylinder, and its differential pressure loss is 6-10MPa, so the throttling loss is very large.

发明内容Contents of the invention

本发明提供一种降低液压系统节流损失的方法，其目的旨在节约能源，延长油液寿命。The invention provides a method for reducing throttling loss of a hydraulic system, and aims at saving energy and prolonging oil life.

为此，本发明所采取的技术解决方案是：For this reason, the technical solution that the present invention takes is:

一种降低液压系统节流损失的方法，其特征在于：A method for reducing throttling loss of a hydraulic system, characterized in that:

建立液压控制系统：Build hydraulic control system:

液压控制系统包括液压缸、单向节流阀Ⅰ、单向节流阀Ⅱ、伺服滑阀Ⅰ、伺服滑阀Ⅱ、液控单向阀Ⅰ、液控单向阀Ⅱ、变量液压泵Ⅰ、变量液压泵Ⅱ、定量液压马达Ⅰ、定量液压马达Ⅱ、换向阀Ⅰ、换向阀Ⅱ、单向阀Ⅰ、单向阀Ⅱ、单向阀Ⅲ、单向阀Ⅳ、阻尼孔Ⅰ、阻尼孔Ⅱ、阻尼孔Ⅲ、阻尼孔Ⅳ、压力油管路及回油管路；变量液压泵Ⅰ与定量液压马达Ⅰ组成一个液压变压器，变量液压泵Ⅱ与定量液压马达Ⅱ组成一个液压变压器；The hydraulic control system includes hydraulic cylinder, one-way throttle valve Ⅰ, one-way throttle valve Ⅱ, servo spool valve Ⅰ, servo spool valve Ⅱ, hydraulic control check valve Ⅰ, hydraulic control check valve Ⅱ, variable hydraulic pump Ⅰ, Variable hydraulic pump II, quantitative hydraulic motor I, quantitative hydraulic motor II, reversing valve I, reversing valve II, one-way valve I, one-way valve II, one-way valve III, one-way valve IV, orifice I, damping Hole Ⅱ, damping hole Ⅲ, damping hole Ⅳ, pressure oil pipeline and oil return pipeline; variable hydraulic pump Ⅰ and quantitative hydraulic motor Ⅰ form a hydraulic transformer, variable hydraulic pump Ⅱ and quantitative hydraulic motor Ⅱ form a hydraulic transformer;

液压控制过程：Hydraulic control process:

换向阀Ⅰ换向处于右位，压力油将液控单向阀Ⅱ打开；The reversing valve I is in the right position, and the pressure oil will open the hydraulic control check valve II;

换向阀Ⅱ换向处于右位，压力油经过换向阀Ⅱ、单向阀Ⅲ、液控单向阀Ⅰ、单向节流阀Ⅱ中的单向阀进入液压缸，推动液压缸活塞杆伸出；The reversing valve II is in the right position, and the pressure oil enters the hydraulic cylinder through the one-way valves in the reversing valve II, check valve III, hydraulic control check valve I, and one-way throttle valve II, and pushes the piston rod of the hydraulic cylinder. stick out;

液压缸有杆腔的油液经过单向节流阀Ⅰ中的节流阀、液控单向阀Ⅱ、定量液压马达Ⅰ、单向阀Ⅳ、换向阀Ⅱ回油箱；The oil in the rod cavity of the hydraulic cylinder returns to the oil tank through the throttle valve in the one-way throttle valve I, the hydraulic control check valve II, the quantitative hydraulic motor I, the one-way valve IV, and the reversing valve II;

设定伺服滑阀Ⅱ的动作压力值P0为0.2～2MPa范围内的某个确定值，根据工艺要求计算出单向节流阀Ⅰ的开口度，这样只要保持单向节流阀Ⅰ两端的压差不变，经过单向节流阀Ⅰ的流量就是一个恒定值，从而保证液压缸按照工艺要求的速度运行；Set the operating pressure value P0 of the servo slide valve II to a certain value within the range of 0.2-2MPa , and calculate the opening degree of the one-way throttle valve I according to the process requirements, so as long as the two ends of the one-way throttle valve I are kept The pressure difference is constant, and the flow through the one-way throttle valve I is a constant value, so as to ensure that the hydraulic cylinder operates at the speed required by the process;

当单向节流阀Ⅰ两端的压差超过伺服滑阀Ⅱ的设定值P0时，说明通过单向节流阀Ⅰ的流量大于期望值，即液压缸的速度大于工艺要求，伺服滑阀Ⅱ动作使变量液压泵Ⅰ的排量增大，变量液压泵Ⅰ需要的功率增大，从而使定量液压马达Ⅰ的输出功率增大，定量液压马达Ⅰ转速下降，通过单向节流阀Ⅰ的流量降低，单向节流阀Ⅰ两端的压差等于P0，伺服滑阀Ⅱ保持现有状态，进入到一个稳定状态；When the pressure difference across the one-way throttle valve I exceeds the set value P 0 of the servo slide valve II, it means that the flow through the one-way throttle valve I is greater than the expected value, that is, the speed of the hydraulic cylinder is greater than the process requirement, and the servo slide valve II The action increases the displacement of the variable hydraulic pump I, and the power required by the variable hydraulic pump I increases, thereby increasing the output power of the quantitative hydraulic motor I, the speed of the quantitative hydraulic motor I decreases, and the flow rate through the one-way throttle valve I decrease, the pressure difference at both ends of the one-way throttle valve I is equal to P 0 , and the servo slide valve II maintains the current state and enters a stable state;

当单向节流阀Ⅰ两端的压差低于伺服滑阀Ⅱ的设定值P0时，说明通过单向节流阀Ⅰ的流量小于期望值，即液压缸的速度小于工艺要求，伺服滑阀Ⅱ动作使变量液压泵Ⅰ的排量减小，变量液压泵Ⅰ需要的功率减小，从而使定量液压马达Ⅰ的输出功率减小，定量液压马达Ⅰ转速上升，通过单向节流阀Ⅰ的流量增加，单向节流阀Ⅰ两端的压差等于P0，伺服滑阀Ⅱ保持现有状态，进入到一个稳定状态；When the pressure difference across the one-way throttle valve I is lower than the set value P 0 of the servo slide valve II, it means that the flow through the one-way throttle valve I is less than the expected value, that is, the speed of the hydraulic cylinder is lower than the process requirement, and the servo slide valve The action of II reduces the displacement of the variable hydraulic pump I, and the power required by the variable hydraulic pump I decreases, thereby reducing the output power of the quantitative hydraulic motor I, increasing the speed of the quantitative hydraulic motor I, and passing through the one-way throttle valve I. The flow rate increases, the pressure difference between the two ends of the one-way throttle valve I is equal to P 0 , and the servo slide valve II maintains the current state and enters a stable state;

换向阀Ⅰ、换向阀Ⅱ换向处于左位时，其液压缸活塞杆缩回的过程与上述伸出的过程类似，在此过程中，单向节流阀Ⅱ两端的压差控制伺服滑阀Ⅰ，进而控制变量液压泵Ⅱ的排量，调节定量液压马达Ⅱ的转速，从而使通过单向节流阀Ⅱ的流量恒定，使液压缸的速度满足工艺要求。When the reversing valve I and reversing valve II are in the left position, the process of retracting the piston rod of the hydraulic cylinder is similar to the process of extending out above. In this process, the pressure difference at both ends of the one-way throttle valve II controls the The spool valve I controls the displacement of the variable hydraulic pump II, and adjusts the speed of the quantitative hydraulic motor II, so that the flow through the one-way throttle valve II is constant, and the speed of the hydraulic cylinder meets the process requirements.

本发明的有益效果为：The beneficial effects of the present invention are:

本发明可有效降低液压系统调速过程中的节流损失，从而极大节省能源，延长油液寿命，实现环境友好、资源节约的目标。The invention can effectively reduce the throttling loss in the speed regulation process of the hydraulic system, thereby greatly saving energy, prolonging the life of oil, and realizing the goals of environmental friendliness and resource saving.

附图说明Description of drawings

图1是液压控制系统液压缸活塞杆伸出状态示意图。Figure 1 is a schematic diagram of the hydraulic cylinder piston rod extended state of the hydraulic control system.

图中：液压缸1、单向节流阀Ⅰ2、单向节流阀Ⅱ3、伺服滑阀Ⅰ4、液控单向阀Ⅰ5、液控单向阀Ⅱ6、伺服滑阀Ⅱ7、变量液压泵Ⅰ8、定量液压马达Ⅰ9、单向阀Ⅰ10、换向阀Ⅰ11、换向阀Ⅱ12、定量液压马达Ⅱ13、变量液压泵Ⅱ14、单向阀Ⅱ15、单向阀Ⅲ16、单向阀Ⅳ17、阻尼孔Ⅰ18、阻尼孔Ⅱ19、阻尼孔Ⅲ20、阻尼孔Ⅳ21。P为压力油管路，T为回油管路。In the figure: hydraulic cylinder 1, one-way throttle valve I2, one-way throttle valve II3, servo slide valve I4, hydraulic control check valve I5, hydraulic control check valve II6, servo slide valve II7, variable hydraulic pump I8, Quantitative hydraulic motor I9, one-way valve I10, reversing valve I11, reversing valve II12, quantitative hydraulic motor II13, variable hydraulic pump II14, one-way valve II15, one-way valve III16, one-way valve IV17, damping hole I18, damping Hole II19, Damping Hole III20, Damping Hole IV21. P is the pressure oil pipeline, and T is the oil return pipeline.

具体实施方式detailed description

建立液压控制系统：Build hydraulic control system:

液压控制系统包括液压缸1、单向节流阀Ⅰ2、单向节流阀Ⅱ3、伺服滑阀Ⅰ4、液控单向阀Ⅰ5、液控单向阀Ⅱ6、伺服滑阀Ⅱ7、变量液压泵Ⅰ8、定量液压马达Ⅰ9、单向阀Ⅰ10、换向阀Ⅰ11、换向阀Ⅱ12、定量液压马达Ⅱ13、变量液压泵Ⅱ14、单向阀Ⅱ15、单向阀Ⅲ16、单向阀Ⅳ17、阻尼孔Ⅰ18、阻尼孔Ⅱ19、阻尼孔Ⅲ20、阻尼孔Ⅳ21、压力油管路P及回油管路T。The hydraulic control system includes hydraulic cylinder 1, one-way throttle valve I2, one-way throttle valve II3, servo slide valve I4, hydraulic control check valve I5, hydraulic control check valve II6, servo slide valve II7, variable hydraulic pump I8 , Quantitative hydraulic motor Ⅰ9, check valve Ⅰ10, reversing valve Ⅰ11, reversing valve Ⅱ12, quantitative hydraulic motor Ⅱ13, variable hydraulic pump Ⅱ14, check valve Ⅱ15, check valve Ⅲ16, check valve Ⅳ17, orifice Ⅰ18, Damping hole II19, damping hole III20, damping hole IV21, pressure oil pipeline P and oil return pipeline T.

变量液压泵Ⅰ8与定量液压马达Ⅰ9组成一个液压变压器，变量液压泵Ⅱ14与定量液压马达Ⅱ13组成一个液压变压器。The variable hydraulic pump I8 and the quantitative hydraulic motor I9 form a hydraulic transformer, and the variable hydraulic pump II14 and the quantitative hydraulic motor II13 form a hydraulic transformer.

液压控制系统的控制过程：The control process of the hydraulic control system:

换向阀Ⅰ11换向处于右位，压力油将液控单向阀Ⅱ6打开。The reversing valve I11 is in the right position, and the pressure oil will open the hydraulic control check valve II6.

换向阀Ⅱ12换向处于右位，压力油经过换向阀Ⅱ12、单向阀Ⅲ16、液控单向阀Ⅰ5、单向节流阀Ⅱ3中的单向阀进入液压缸1，推动液压缸1的活塞杆伸出。The reversing valve II12 is in the right position, and the pressure oil enters the hydraulic cylinder 1 through the one-way valves in the reversing valve II12, check valve III16, hydraulic control check valve I5, and one-way throttle valve II3 to push the hydraulic cylinder 1 The piston rod extends.

液压缸1有杆腔的油液经过单向节流阀Ⅰ2中的节流阀、液控单向阀Ⅱ6、定量液压马达Ⅰ9、单向阀Ⅳ17、换向阀Ⅱ12后回油箱。The oil in the rod chamber of the hydraulic cylinder 1 passes through the throttle valve in the one-way throttle valve I2, the hydraulic control check valve II6, the quantitative hydraulic motor I9, the one-way valve IV17, and the reversing valve II12, and then returns to the oil tank.

设定伺服滑阀Ⅱ7的动作压力值P0为0.2～2MPa范围内的某个确定值，根据工艺要求计算出单向节流阀Ⅰ2的开口度，这样只要保持单向节流阀Ⅰ2两端的压差不变，经过单向节流阀Ⅰ2的流量就是一个恒定值，从而保证液压缸1按照工艺要求的速度运行。Set the operating pressure value P0 of the servo slide valve II7 to a certain value within the range of 0.2-2MPa, and calculate the opening degree of the one-way throttle valve I2 according to the process requirements, so as long as the two ends of the one-way throttle valve I2 are kept The pressure difference is constant, and the flow through the one-way throttle valve I2 is a constant value, thus ensuring that the hydraulic cylinder 1 operates at the speed required by the process.

当单向节流阀Ⅰ2两端的压差超过伺服滑阀Ⅱ7的设定值P0时，说明通过单向节流阀Ⅰ2的流量大于期望值，即液压缸1的速度大于工艺要求，伺服滑阀Ⅱ7动作使变量液压泵Ⅰ8的排量增大，变量液压泵Ⅰ8需要的功率增大，从而使定量液压马达Ⅰ9的输出功率增大，定量液压马达Ⅰ9转速下降，通过单向节流阀Ⅰ2的流量降低，单向节流阀Ⅰ2两端的压差等于P0，伺服滑阀Ⅱ7保持现有状态，进入到一个稳定状态。When the pressure difference across the one-way throttle valve Ⅰ2 exceeds the set value P 0 of the servo spool valve Ⅱ7, it means that the flow through the one-way throttle valve Ⅰ2 is greater than the expected value, that is, the speed of the hydraulic cylinder 1 is greater than the process requirement, and the servo spool valve The action of II7 increases the displacement of the variable hydraulic pump I8, and the power required by the variable hydraulic pump I8 increases, thereby increasing the output power of the quantitative hydraulic motor I9, and the speed of the quantitative hydraulic motor I9 decreases. The flow rate decreases, the pressure difference across the one-way throttle valve Ⅰ2 is equal to P 0 , and the servo spool valve Ⅱ7 maintains the current state and enters a stable state.

当单向节流阀Ⅰ2两端的压差低于伺服滑阀Ⅱ7的设定值P0时，说明通过单向节流阀Ⅰ2的流量小于期望值，即液压缸1的速度小于工艺要求，伺服滑阀Ⅱ7动作使变量液压泵Ⅰ8的排量减小，变量液压泵Ⅰ8需要的功率减小，从而使定量液压马达Ⅰ9的输出功率减小，定量液压马达Ⅰ9转速上升，通过单向节流阀Ⅰ2的流量增加，单向节流阀Ⅰ2两端的压差等于P0，伺服滑阀Ⅱ7保持现有状态，进入到一个稳定状态。When the pressure difference across the one-way throttle valve Ⅰ2 is lower than the set value P 0 of the servo spool valve Ⅱ7, it means that the flow through the one-way throttle valve Ⅰ2 is less than the expected value, that is, the speed of the hydraulic cylinder 1 is lower than the process requirement, and the servo spool The action of the valve II7 reduces the displacement of the variable hydraulic pump I8, and the power required by the variable hydraulic pump I8 decreases, thereby reducing the output power of the quantitative hydraulic motor I9, and the speed of the quantitative hydraulic motor I9 increases. The flow rate increases, the pressure difference across the one-way throttle valve Ⅰ2 is equal to P 0 , and the servo spool valve Ⅱ7 maintains the current state and enters a stable state.

换向阀Ⅰ11、换向阀Ⅱ12换向处于左位时，其液压缸1活塞杆缩回的过程与上述伸出的过程类似。在此过程中，单向节流阀Ⅱ3两端的压差控制伺服滑阀Ⅰ4，进而控制变量液压泵Ⅱ14的排量，调节定量液压马达Ⅱ13的转速，从而使通过单向节流阀Ⅱ3的流量恒定，使液压缸1的速度满足工艺要求。When the reversing valve I11 and reversing valve II12 are in the left position, the process of retracting the piston rod of the hydraulic cylinder 1 is similar to the above-mentioned extending process. During this process, the pressure difference at both ends of the one-way throttle valve II3 controls the servo slide valve I4, and then controls the displacement of the variable hydraulic pump II14, and adjusts the speed of the quantitative hydraulic motor II13, so that the flow through the one-way throttle valve II3 Constant, so that the speed of the hydraulic cylinder 1 meets the process requirements.

阻尼孔Ⅰ18、阻尼孔Ⅱ19会使伺服滑阀Ⅱ7的动作平缓一些，以避免伺服滑阀Ⅱ7频繁动作，形成震荡状态。而伺服滑阀Ⅱ7在设计制造时则应留有死区。The damping hole I18 and the damping hole II19 will make the action of the servo spool II7 more gentle, so as to avoid the frequent action of the servo spool II7 and form an oscillating state. The servo slide valve II7 should have a dead zone when designing and manufacturing.

Claims (1)

1. a kind of method for reducing hydraulic system restriction loss, it is characterised in that：
Set up hydraulic control system：
Hydraulic control system include hydraulic cylinder, one-way throttle valve I, one-way throttle valve II, servo guiding valve I, servo guiding valve II, Hydraulic control one-way valve I, hydraulic control one-way valve II, volume adjustable hydraulic pump I, volume adjustable hydraulic pump II, constant displacement hydraulic motor I, quantitative hydraulic Motor II, reversal valve I, reversal valve II, check valve I, check valve II, check valve III, check valve IV, damping hole I, resistance Buddhist nun hole II, damping hole III, damping hole IV, pressure oil pipeline and return line；I group of volume adjustable hydraulic pump I and constant displacement hydraulic motor Into a hydraulic transformer, volume adjustable hydraulic pump II constitutes a hydraulic transformer with constant displacement hydraulic motor II；
Hydraulic control process：
The commutation of reversal valve I is in right position, and pressure oil opens hydraulic control one-way valve II；
The commutation of reversal valve II is in right position, and pressure oil passes through reversal valve II, check valve III, hydraulic control one-way valve I, one-way throttle valve Check valve in II enters hydraulic cylinder, promotes hydraulic cylinder piston rod to stretch out；
The fluid of hydraulic cylinder rod chamber pass through one-way throttle valve I in choke valve, hydraulic control one-way valve II, constant displacement hydraulic motor I, Check valve IV, the oil return box of reversal valve II；
Set the operating pressure value P of servo guiding valve II0For some determination value in the range of 0.2~2MPa, calculated according to technological requirement Go out the opening degree of one-way throttle valve I, as long as so keeping the pressure difference at the two ends of one-way throttle valve I constant, by one-way throttle valve I Flow be exactly a steady state value so that ensure hydraulic cylinder according to technological requirement speed run；
When the pressure difference at the two ends of one-way throttle valve I exceedes the setting value P of servo guiding valve II0When, illustrate the stream by one-way throttle valve I Amount is more than technological requirement more than the speed of desired value, i.e. hydraulic cylinder, and the action of servo guiding valve II increases the discharge capacity of volume adjustable hydraulic pump I, The power increase that volume adjustable hydraulic pump I needs, so that the power output increase of constant displacement hydraulic motor I, I turn of constant displacement hydraulic motor Speed declines, by the flow-reduction of one-way throttle valve I, and the pressure difference at the two ends of one-way throttle valve I is equal to P0, servo guiding valve II keeps Standing state, enters a stable state；
When the pressure difference at the two ends of one-way throttle valve I is less than the setting value P of servo guiding valve II0When, illustrate the stream by one-way throttle valve I Amount is less than technological requirement less than the speed of desired value, i.e. hydraulic cylinder, and the action of servo guiding valve II reduces the discharge capacity of volume adjustable hydraulic pump I, The power reduction that volume adjustable hydraulic pump I needs, so that the power output of constant displacement hydraulic motor I reduces, I turn of constant displacement hydraulic motor Speed rises, and by the flow increase of one-way throttle valve I, the pressure difference at the two ends of one-way throttle valve I is equal to P0, servo guiding valve II keeps Standing state, enters a stable state；
When reversal valve I, the commutation of reversal valve II are in left position, the process that its hydraulic cylinder piston rod is retracted and the process class of above-mentioned stretching Seemingly, in the process, the pressure difference control servo guiding valve I at the two ends of one-way throttle valve II, and then the discharge capacity of control volume adjustable hydraulic pump II, The rotating speed of adjustment quantitative hydraulic motor II, so that it is constant by the flow of one-way throttle valve II, the speed of hydraulic cylinder is met work Skill requirement.
CN201610057523.9A 2016-01-27 2016-01-27 Method for reducing throttling loss of hydraulic system Pending CN107013517A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963378A (en) * 1975-06-04 1976-06-15 Caterpillar Tractor Co. Part throttle control -- pump override
CN1190601C (en) * 2002-10-29 2005-02-23 浙江大学 Load sensing hydraulic system for controlling six-way multiple unit valve
CN103758810A (en) * 2013-10-22 2014-04-30 陕西盛迈石油有限公司 Open core type load sensory system
WO2014119569A1 (en) * 2013-01-29 2014-08-07 日立建機株式会社 Pressure oil energy recovery device for operating machine
CN204200727U (en) * 2014-09-19 2015-03-11 鞍钢股份有限公司 Hydraulic speed regulation loop system of axial plunger variable displacement motor
CN104863914A (en) * 2015-04-13 2015-08-26 徐州徐工液压件有限公司 Electrohydraulic joint control flow collecting valve
CN103321981B (en) * 2013-07-01 2015-09-02 武汉船用机械有限责任公司 Shark jaw oil cylinder working-pressure protective system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963378A (en) * 1975-06-04 1976-06-15 Caterpillar Tractor Co. Part throttle control -- pump override
CN1190601C (en) * 2002-10-29 2005-02-23 浙江大学 Load sensing hydraulic system for controlling six-way multiple unit valve
WO2014119569A1 (en) * 2013-01-29 2014-08-07 日立建機株式会社 Pressure oil energy recovery device for operating machine
CN103321981B (en) * 2013-07-01 2015-09-02 武汉船用机械有限责任公司 Shark jaw oil cylinder working-pressure protective system
CN103758810A (en) * 2013-10-22 2014-04-30 陕西盛迈石油有限公司 Open core type load sensory system
CN204200727U (en) * 2014-09-19 2015-03-11 鞍钢股份有限公司 Hydraulic speed regulation loop system of axial plunger variable displacement motor
CN104863914A (en) * 2015-04-13 2015-08-26 徐州徐工液压件有限公司 Electrohydraulic joint control flow collecting valve

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Application publication date: 20170804