CN110259741B - A quantitative compound control hydraulic system and engineering machinery - Google Patents
A quantitative compound control hydraulic system and engineering machinery Download PDFInfo
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- 150000001875 compounds Chemical class 0.000 title claims abstract description 29
- 239000012530 fluid Substances 0.000 claims abstract description 39
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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
- F15B11/003—Systems with load-holding valves
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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
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
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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
- 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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- 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
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
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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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
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Abstract
Description
技术领域Technical Field
本发明涉及一种定量复合控制液压系统及工程机械，属于工程机械技术领域。The invention relates to a quantitative compound control hydraulic system and engineering machinery, belonging to the technical field of engineering machinery.
背景技术Background technique
现有技术中，装载机等工程车辆的液压系统大多为定量开芯系统，而开芯系统在实现复合动作具有一定的局限性，后来出现的变量负载敏感系统，使用变量泵及负载敏感阀，成本较高且系统复杂，在实际推广应用时具有一定的局限性。In the prior art, the hydraulic systems of engineering vehicles such as loaders are mostly quantitative open-core systems, which have certain limitations in achieving compound actions. The variable load-sensitive system that emerged later uses a variable pump and a load-sensitive valve, which is costly and complex, and has certain limitations in actual promotion and application.
发明内容Summary of the invention
目的：为了克服现有技术中存在的不足，本发明提供一种定量复合控制液压系统及工程机械。Purpose: In order to overcome the deficiencies in the prior art, the present invention provides a quantitative compound control hydraulic system and engineering machinery.
技术方案：为解决上述技术问题，本发明采用的技术方案为：Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is:
一种定量复合控制液压系统，包括第一定量液压泵、信号阀、敏感多路阀、工作液压缸；A quantitative compound control hydraulic system, comprising a first quantitative hydraulic pump, a signal valve, a sensitive multi-way valve, and a working hydraulic cylinder;
所述第一定量液压泵，为工作液压缸供液压流体；所述第一定量液压泵，经信号阀为敏感多路阀供液压流体；The first quantitative hydraulic pump supplies hydraulic fluid to the working hydraulic cylinder; the first quantitative hydraulic pump supplies hydraulic fluid to the sensitive multi-way valve via the signal valve;
所述信号阀包括第一出口和第二出口，信号阀进口与第一定量液压泵连通，所述第一出口与敏感多路阀的进口连通，所述第二出口与液压流体箱连通；The signal valve comprises a first outlet and a second outlet, the signal valve inlet is communicated with a first quantitative hydraulic pump, the first outlet is communicated with an inlet of a sensitive multi-way valve, and the second outlet is communicated with a hydraulic fluid tank;
所述信号阀由敏感多路阀传递LS信号控制，具有第一状态和第二状态；The signal valve is controlled by the LS signal transmitted by the sensitive multi-way valve and has a first state and a second state;
其中，敏感多路阀工作时，传递信号至信号阀，信号阀处于第一状态，信号阀进口与第一出口连通，信号阀的第一出口同时反馈信号至信号阀阀芯一端，与信号阀阀芯另一端弹簧力和LS信号进行比较，控制供给敏感多路阀的流量；When the sensitive multi-way valve is working, a signal is transmitted to the signal valve, the signal valve is in the first state, the inlet of the signal valve is connected to the first outlet, and the first outlet of the signal valve simultaneously feeds back a signal to one end of the valve core of the signal valve, which is compared with the spring force and LS signal at the other end of the valve core of the signal valve, so as to control the flow supplied to the sensitive multi-way valve;
敏感多路阀不工作时，信号阀复位处于第二状态，信号阀进口与第二出口连通，第一定量液压泵经信号阀直接流回液压流体箱。When the sensitive multi-way valve is not working, the signal valve is reset to the second state, the signal valve inlet is connected to the second outlet, and the first quantitative hydraulic pump directly flows back to the hydraulic fluid box through the signal valve.
作为优选方案，所述定量复合控制液压系统，还包括第二定量液压泵、转向阀、第三工作液压缸，所述第二定量液压泵为第三工作液压缸供液压流体；所述第二定量液压泵通过转向阀控制流量，按需供给第三工作液压缸液压流体，多余液压流体流回液压流体箱。As a preferred embodiment, the quantitative compound control hydraulic system also includes a second quantitative hydraulic pump, a steering valve, and a third working hydraulic cylinder. The second quantitative hydraulic pump supplies hydraulic fluid to the third working hydraulic cylinder. The second quantitative hydraulic pump controls the flow through the steering valve and supplies hydraulic fluid to the third working hydraulic cylinder on demand, and excess hydraulic fluid flows back to the hydraulic fluid tank.
作为优选方案，所述定量复合控制液压系统，还包括转向器，所述转向器与转向阀连接，用于通过转向器控制转向阀换向。As a preferred solution, the quantitative compound control hydraulic system further includes a steering gear, which is connected to the steering valve and is used to control the switching of the steering valve through the steering gear.
作为优选方案，所述定量复合控制液压系统，所述敏感多路阀为闭中心敏感多路阀，所述工作液压缸包括第一工作液压缸和第二工作液压缸；As a preferred solution, in the quantitative compound control hydraulic system, the sensitive multi-way valve is a closed-center sensitive multi-way valve, and the working hydraulic cylinder includes a first working hydraulic cylinder and a second working hydraulic cylinder;
所述敏感多路阀具有进口P、第一工作口和第二工作口、先导油口、控制口X、回流口T、反馈口LS；所述敏感多路阀的进口P与所述信号阀的第一出口连通，所述敏感多路阀的第一工作口与所述第一工作液压缸连通，所述敏感多路阀的第二工作口与所述第二工作液压缸连通；所述先导油口与先导阀对应油口相通；所述反馈口LS与信号阀连接，用于反馈信号给信号阀。The sensitive multi-way valve has an inlet P, a first working port and a second working port, a pilot oil port, a control port X, a reflux port T, and a feedback port LS; the inlet P of the sensitive multi-way valve is connected to the first outlet of the signal valve, the first working port of the sensitive multi-way valve is connected to the first working hydraulic cylinder, and the second working port of the sensitive multi-way valve is connected to the second working hydraulic cylinder; the pilot oil port is connected to the corresponding oil port of the pilot valve; the feedback port LS is connected to the signal valve for feeding back a signal to the signal valve.
作为优选方案，所述定量复合控制液压系统，所述的敏感多路阀包括负载保持阀，所述负载保持阀位于第二联阀芯与工作口A之间，用于保持第二工作液压缸位置。As a preferred solution, in the quantitative compound control hydraulic system, the sensitive multi-way valve includes a load holding valve, and the load holding valve is located between the second joint valve core and the working port A, and is used to maintain the position of the second working hydraulic cylinder.
作为优选方案，所述定量复合控制液压系统，所述的敏感多路阀还包括LS流量阀，所述LS流量阀的进口与反馈口LS油路连接，出口与回油通道L相通。As a preferred solution, in the quantitative compound control hydraulic system, the sensitive multi-way valve further comprises an LS flow valve, the inlet of the LS flow valve is connected to the feedback port LS oil circuit, and the outlet is communicated with the return oil channel L.
作为优选方案，所述定量复合控制液压系统，所述的敏感多路阀还包括溢流阀，所述溢流阀的进口与敏感多路阀的进口P连通，出口与回流口T相通。As a preferred solution, in the quantitative compound control hydraulic system, the sensitive multi-way valve further comprises a relief valve, the inlet of the relief valve is connected to the inlet P of the sensitive multi-way valve, and the outlet is connected to the reflux port T.
作为优选方案，所述定量复合控制液压系统，还包括减压阀，所述减压阀的进口与信号阀的第一出口、敏感多路阀进口P相通，减压阀的出口分别与转向器、先导阀P口、敏感多路阀控制口X连接，分别给转向器和先导阀提供流量；减压阀通过控制口X给敏感多路阀中提供压力；As a preferred solution, the quantitative compound control hydraulic system further includes a pressure reducing valve, the inlet of the pressure reducing valve is connected to the first outlet of the signal valve and the inlet P of the sensitive multi-way valve, and the outlet of the pressure reducing valve is respectively connected to the steering gear, the P port of the pilot valve, and the control port X of the sensitive multi-way valve, respectively providing flow to the steering gear and the pilot valve; the pressure reducing valve provides pressure to the sensitive multi-way valve through the control port X;
当敏感多路阀换向时，控制口X压力油通过敏感多路阀第二联阀芯至负载保持阀，负载保持阀打开，保证第二工作液压缸正常动作。When the sensitive multi-way valve is switched, the pressure oil at the control port X passes through the second valve core of the sensitive multi-way valve to the load holding valve, and the load holding valve opens to ensure the normal operation of the second working hydraulic cylinder.
另一方面，本发明还提供一种工程机械，包括上述定量复合控制液压系统。进一步的，所述的工程机械，包括装载机。On the other hand, the present invention also provides an engineering machine, comprising the quantitative compound control hydraulic system. Furthermore, the engineering machine comprises a loader.
有益效果：本发明提供的定量复合控制液压系统，第一，通过信号阀配合敏感多路阀，敏感多路阀通过与信号阀匹配，实现工作液压缸复合控制动作，提高了工作装置工作效率，以改善现有技术中存在的定量液压系统多机构复合控制问题；第二，通过敏感多路阀中集成负载保持阀，与减压阀提供的控制压力，通过敏感多路阀阀芯控制负载保持阀的开启和关闭，有效的解决了现有定量系统工作油缸沉降量大的问题，以改善工作液压缸因敏感多路阀泄漏量大保持位置难的问题，第三，结构简单，系统可靠，成本低。Beneficial effects: The quantitative compound control hydraulic system provided by the present invention, first, realizes the compound control action of the working hydraulic cylinder by matching the signal valve with the sensitive multi-way valve, thereby improving the working efficiency of the working device, so as to improve the problem of multi-mechanism compound control of the quantitative hydraulic system existing in the prior art; second, by integrating the load holding valve in the sensitive multi-way valve and the control pressure provided by the pressure reducing valve, the opening and closing of the load holding valve is controlled by the valve core of the sensitive multi-way valve, thereby effectively solving the problem of large settlement of the working cylinder of the existing quantitative system, so as to improve the problem of difficulty in maintaining the position of the working hydraulic cylinder due to large leakage of the sensitive multi-way valve; third, the structure is simple, the system is reliable, and the cost is low.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1是本发明实施例的原理图；FIG1 is a schematic diagram of an embodiment of the present invention;
图中：第二定量液压泵1、转向器2、转向阀3、第三工作液压缸4、第一定量液压泵5、信号阀6、减压阀7、先导阀8、敏感多路阀9、第一工作液压缸10、第二工作液压缸11、负载保持阀12、LS流量阀13、溢流阀14、液压流体箱15。In the figure: a second fixed-flow hydraulic pump 1, a steering gear 2, a steering valve 3, a third working hydraulic cylinder 4, a first fixed-flow hydraulic pump 5, a signal valve 6, a pressure reducing valve 7, a pilot valve 8, a sensitive multi-way valve 9, a first working hydraulic cylinder 10, a second working hydraulic cylinder 11, a load holding valve 12, an LS flow valve 13, a relief valve 14, and a hydraulic fluid box 15.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本发明及其应用或使用的任何限制。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。同时，应当明白，为了便于描述，附图中所示出的各个部分的尺寸并不是按照实际的比例关系绘制的。对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，所述技术、方法和设备应当被视为授权说明书的一部分。在这里示出和讨论的所有示例中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它示例可以具有不同的值。应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
如图1所示，为一种定量复合控制液压系统及工程机械，包括：As shown in FIG1 , a quantitative compound control hydraulic system and engineering machinery are shown, including:
第一定量液压泵5，为工作液压缸供液压流体；第二定量液压泵1，为第三工作液压缸4供液压流体；The first quantitative hydraulic pump 5 supplies hydraulic fluid to the working hydraulic cylinder; the second quantitative hydraulic pump 1 supplies hydraulic fluid to the third working hydraulic cylinder 4;
第一定量液压泵5，经信号阀6为敏感多路阀9供液压流体，敏感多路阀9工作时，传递信号至信号阀6，使得第一定量液压泵5给工作液压缸供液压流体，不工作时，信号阀6复位，第二定量液压泵直接回液压流体箱。The first quantitative hydraulic pump 5 supplies hydraulic fluid to the sensitive multi-way valve 9 through the signal valve 6. When the sensitive multi-way valve 9 is working, it transmits a signal to the signal valve 6, so that the first quantitative hydraulic pump 5 supplies hydraulic fluid to the working hydraulic cylinder. When it is not working, the signal valve 6 is reset, and the second quantitative hydraulic pump directly returns to the hydraulic fluid tank.
第二定量液压泵1通过转向阀3控制流量，按需供给第三工作液压缸4液压流体，满足第三工作液压缸4要求，多余液压流体经散热流回液压流体箱15。The second quantitative hydraulic pump 1 controls the flow rate through the steering valve 3, supplies the hydraulic fluid to the third working hydraulic cylinder 4 as required to meet the requirements of the third working hydraulic cylinder 4, and the excess hydraulic fluid flows back to the hydraulic fluid box 15 after heat dissipation.
在一些实施例中，所述工作液压缸包括第一工作液压缸10和第二工作液压缸11。In some embodiments, the working hydraulic cylinder includes a first working hydraulic cylinder 10 and a second working hydraulic cylinder 11 .
在一些实施例中，所述第三工作液压缸4可以为转向液压缸。所述转向阀3具有使转向液压缸的活塞杆伸出的第一状态和使转向液压缸的活塞杆缩回的第二状态。In some embodiments, the third working hydraulic cylinder 4 may be a steering hydraulic cylinder. The steering valve 3 has a first state that extends the piston rod of the steering hydraulic cylinder and a second state that retracts the piston rod of the steering hydraulic cylinder.
进一步的，所述的信号阀6包括第一出口和第二出口，信号阀6进口与第一定量液压泵5连通，所述第一出口与敏感多路阀9的进口连通，所述第二出口与液压流体箱15连通；所述信号阀6由敏感多路阀9传递LS信号控制，具有第一状态和第二状态；Further, the signal valve 6 includes a first outlet and a second outlet, the inlet of the signal valve 6 is connected to the first quantitative hydraulic pump 5, the first outlet is connected to the inlet of the sensitive multi-way valve 9, and the second outlet is connected to the hydraulic fluid box 15; the signal valve 6 is controlled by the LS signal transmitted by the sensitive multi-way valve 9, and has a first state and a second state;
其中，敏感多路阀9工作时，传递LS信号至信号阀6，信号阀6处于第一状态，信号阀6进口与第一出口连通，信号阀6的第一出口同时反馈信号至信号阀6阀芯一端，与信号阀6阀芯另一端弹簧力和LS信号进行比较，控制供给敏感多路阀9的流量；When the sensitive multi-way valve 9 is working, the LS signal is transmitted to the signal valve 6, the signal valve 6 is in the first state, the inlet of the signal valve 6 is connected with the first outlet, and the first outlet of the signal valve 6 simultaneously feeds back a signal to one end of the valve core of the signal valve 6, which is compared with the spring force and the LS signal at the other end of the valve core of the signal valve 6 to control the flow supplied to the sensitive multi-way valve 9;
敏感多路阀9不工作时，信号阀6复位处于第二状态，信号阀6进口与第二出口连通，第一定量液压泵5经信号阀6直接流回液压流体箱15。When the sensitive multi-way valve 9 is not working, the signal valve 6 is reset to the second state, the inlet of the signal valve 6 is connected with the second outlet, and the first quantitative hydraulic pump 5 directly flows back to the hydraulic fluid box 15 through the signal valve 6.
进一步的，所述敏感多路阀9为闭中心敏感多路阀，所述敏感多路阀9具有进口P、第一工作口A1、B1和第二工作口A2、B2、先导油口a1、b1、控制口X、回流口T、反馈口LS，所述敏感多路阀9的进口P与所述信号阀的出口连通，所述敏感多路阀9的第一工作口A1、B1与所述第一工作液压缸10连通，所述敏感多路阀9的第二工作口（A2、B2）与所述第二工作液压缸11连通； 所述先导油口a1、b1与先导阀8对应油口相通，所述反馈口LS与信号阀6连接，用于反馈信号给信号阀6。Furthermore, the sensitive multi-way valve 9 is a closed-center sensitive multi-way valve, and the sensitive multi-way valve 9 has an inlet P, a first working port A1, B1 and a second working port A2, B2, a pilot oil port a1, b1, a control port X, a reflux port T, and a feedback port LS. The inlet P of the sensitive multi-way valve 9 is connected to the outlet of the signal valve, the first working ports A1, B1 of the sensitive multi-way valve 9 are connected to the first working hydraulic cylinder 10, and the second working port (A2, B2) of the sensitive multi-way valve 9 is connected to the second working hydraulic cylinder 11; the pilot oil ports a1, b1 are connected to the corresponding oil ports of the pilot valve 8, and the feedback port LS is connected to the signal valve 6 for feeding back signals to the signal valve 6.
更为优选的，所述的敏感多路阀9包括负载保持阀12，所述负载保持阀12位于第二联阀芯与工作口A2之间，用于保持第二工作液压缸11位置。More preferably, the sensitive multi-way valve 9 includes a load holding valve 12 , and the load holding valve 12 is located between the second joint valve core and the working port A2 , and is used to maintain the position of the second working hydraulic cylinder 11 .
更为优选的，所述的敏感多路阀9还包括LS流量阀13，所述LS流量阀13的进口与LS油路连接，出口与回油通道L相通。More preferably, the sensitive multi-way valve 9 further comprises an LS flow valve 13 , the inlet of the LS flow valve 13 is connected to the LS oil circuit, and the outlet is communicated with the oil return channel L.
更为优选的，所述的敏感多路阀9还包括溢流阀14，所述溢流阀14的进口与敏感多路阀的进口P连通，出口与回流口T相通。More preferably, the sensitive multi-way valve 9 further comprises an overflow valve 14 , the inlet of the overflow valve 14 is communicated with the inlet P of the sensitive multi-way valve, and the outlet of the overflow valve 14 is communicated with the reflux port T.
进一步的，所述定量复合控制液压系统还包括减压阀7，减压阀7的进口与信号阀6的出口、敏感多路阀P口相通，出口分别与转向器2、敏感多路阀控制口X、先导阀P口连接，分别给转向器2和先导阀8提供流量，通过控制口X给敏感多路阀9中提供压力，当敏感多路阀9换向时，控制口X压力油通过敏感多路阀9第二联阀芯至负载保持阀12，负载保持阀打开，保证第二工作液压缸11正常动作。当阀杆换向时，此压力与负载保持阀12接通，并且打开负载保持阀12，使得第二工作液压缸大腔与敏感多路阀回油相通，保证第二工作液压缸正常动作。Furthermore, the quantitative compound control hydraulic system also includes a pressure reducing valve 7, the inlet of the pressure reducing valve 7 is connected to the outlet of the signal valve 6 and the P port of the sensitive multi-way valve, and the outlet is connected to the steering gear 2, the control port X of the sensitive multi-way valve, and the P port of the pilot valve, respectively, to provide flow to the steering gear 2 and the pilot valve 8, respectively, and to provide pressure to the sensitive multi-way valve 9 through the control port X. When the sensitive multi-way valve 9 is switched, the pressure oil of the control port X passes through the second joint valve core of the sensitive multi-way valve 9 to the load holding valve 12, and the load holding valve is opened to ensure the normal operation of the second working hydraulic cylinder 11. When the valve stem is switched, this pressure is connected to the load holding valve 12, and the load holding valve 12 is opened, so that the large chamber of the second working hydraulic cylinder is connected to the return oil of the sensitive multi-way valve, ensuring the normal operation of the second working hydraulic cylinder.
在一些实施例中，如图1所示，第二定量液压泵1给转向阀3供液压流体，通过转向器2控制转向阀3换向，转向阀换向控制第三工作液压缸4伸出和缩回，转向阀3按需供给第三工作液压缸液压流体，满足转向要求，多余液压流体经散热流回液压流体箱15。In some embodiments, as shown in Figure 1, the second fixed-measuring hydraulic pump 1 supplies hydraulic fluid to the steering valve 3, and controls the reversing of the steering valve 3 through the steering gear 2. The reversing of the steering valve controls the extension and retraction of the third working hydraulic cylinder 4. The steering valve 3 supplies hydraulic fluid to the third working hydraulic cylinder on demand to meet the steering requirements, and the excess hydraulic fluid flows back to the hydraulic fluid tank 15 after heat dissipation.
第一定量液压泵5给信号阀6供液压流体，当先导阀8不操作时，敏感多路阀9处于中位，反馈口LS通过LS流量阀13与低压油路相通，此时无压力，信号阀6处于左位，第一定量液压泵5通过左位流回液压流体箱15；当敏感多路阀9小开口时，反馈口LS反馈信号至信号阀6，信号阀6处于小开口进行分流，满足敏感多路阀的流量需求，多余液压流体流回液压流体箱15。The first quantitative hydraulic pump 5 supplies hydraulic fluid to the signal valve 6. When the pilot valve 8 is not operated, the sensitive multi-way valve 9 is in the middle position, and the feedback port LS is connected to the low-pressure oil circuit through the LS flow valve 13. At this time, there is no pressure, and the signal valve 6 is in the left position. The first quantitative hydraulic pump 5 flows back to the hydraulic fluid tank 15 through the left position; when the sensitive multi-way valve 9 is slightly opened, the feedback port LS feeds back a signal to the signal valve 6, and the signal valve 6 is in a small opening for diversion to meet the flow demand of the sensitive multi-way valve, and the excess hydraulic fluid flows back to the hydraulic fluid tank 15.
当第二工作液压缸11运动到极限位置时，达到溢流阀14压力后，通过溢流阀进行溢流。中位时，敏感多路阀进口压力维持在2MPa，可经减压阀7供转向器2和先导阀8工作。其次，当敏感多路阀9在中位时，负载保持阀12控制信号为零，负载保持阀保证第二工作液压缸位置不变，当敏感多路阀9换向时，控制口X压力油通过敏感多路阀阀芯至负载保持阀12，负载保持阀打开，第二工作液压缸正常动作。When the second working hydraulic cylinder 11 moves to the limit position, after reaching the pressure of the relief valve 14, the overflow is performed through the relief valve. When in the middle position, the inlet pressure of the sensitive multi-way valve is maintained at 2MPa, which can be supplied to the steering gear 2 and the pilot valve 8 through the pressure reducing valve 7. Secondly, when the sensitive multi-way valve 9 is in the middle position, the control signal of the load holding valve 12 is zero, and the load holding valve ensures that the position of the second working hydraulic cylinder remains unchanged. When the sensitive multi-way valve 9 is reversed, the pressure oil at the control port X passes through the valve core of the sensitive multi-way valve to the load holding valve 12, the load holding valve opens, and the second working hydraulic cylinder operates normally.
另一方面，还提供一种工程机械，包括上述的定量复合控制液压系统。进一步的，所述的工程机械包括装载机。On the other hand, there is also provided an engineering machine, comprising the above-mentioned quantitative compound control hydraulic system. Furthermore, the engineering machine comprises a loader.
以上所述仅是本发明的优选实施方式，应当指出：对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
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