具有小负载自动补偿的分流比负载敏感多路阀关键技术研究
发布时间：2019-03-31 10:08
【摘要】：分流比负载敏感多路阀是一种用于工程机械及其他多执行器机械节能型液压系统的负载敏感多路阀,它极大地改善了多执行器同时工作时的速度协调性问题,当负载所需流量大于系统最大流量时,各执行器按阀杆行程成比例地分配流量,以保证各执行器运行的协调性。本课题对一种具有小负载自动补偿的分流比负载敏感多路阀进行研究。本文的研究内容主要有以下四个部分组成： 1.原理研究。通过分析现有经典的分流比负载敏感多路阀工作原理,发现它们在最大负载压力接近系统最大压力时存在的缺陷,研究了一种具有小负载自动补偿的分流比负载敏感多路阀,并从原理上论证了该方案不仅具有经典的分流比负载敏感多路阀的一切特性,而且还具有小负载自动补偿性能。 2.结构设计。在分析现有分流比负载敏感多路阀结构的基础上,绘制出具有小负载自动补偿的分流比负载敏感多路阀结构图,包括进油联阀片、各联负载阀片及负载敏感信号选择阀片。然后对多路阀的阀芯、阀体配合间隙,流量的泄漏,节流口形状、尺寸,阀口的面积曲线,弹簧的刚度、预压缩量等关键参数进行设计。 3.系统建模和仿真分析。首先对该分流比负载敏感多路阀系统进行数学建模,主要包括先导阀建模、分流比负载敏感多路阀建模及负载敏感变量泵建模。然后运用现有软件对该系统进行压差相等特性、流量分流特性、流量抗饱和特性、小负载压差自动补偿特性等功能进行分析；对各阀芯泄漏量进行分析；主阀芯换向过程中制动、阀口突然关闭及最大负载的突变对主阀口压差和流量的影响；主阀芯及二位三通换向阀阀芯的响应速度分析。 4.优化设计。对主阀芯弹簧刚度及预压缩量、顺序阀阀芯弹簧刚度及预压缩量、二位三通换向阀阀芯弹簧刚度及预压缩量进行优化。
[Abstract]:Split ratio load-sensitive multi-circuit valve is a kind of load-sensitive multi-way valve used in the hydraulic system of construction machinery and other multi-actuator mechanical energy-saving type. It greatly improves the speed coordination of multi-actuator when it works at the same time. When the load demand is greater than the maximum flow of the system, the actuators distribute the flow proportionally according to the stroke of the valve stem, so as to ensure the coordination of the operation of the actuators. In this paper, a kind of load-sensitive multi-circuit valve with small load auto-compensation is studied. The main contents of this paper are as follows: 1. Principle research. Based on the analysis of the existing classical load-sensitive multi-channel valves, the defects of them when the maximum load pressure is close to the maximum pressure of the system are found, and a kind of load-sensitive multi-channel valve with small load auto-compensation is studied. It is demonstrated in principle that this scheme not only has all the characteristics of the classical load-sensitive multi-circuit valve, but also has the performance of automatic compensation for small load. 2. Structural design. Based on the analysis of the structure of the load-sensitive multi-circuit valve, the structure diagram of the load-sensitive multi-circuit valve with small load auto-compensation is drawn, including the inlet valve plate, each load valve piece and the load sensitive signal selection valve plate. Then the key parameters such as valve core, valve body fit clearance, flow leakage, throttle shape, size, area curve of valve port, spring stiffness, pre-compression and other key parameters are designed. 3. System modeling and simulation analysis. Firstly, the mathematical modeling of the shunt ratio load-sensitive multi-channel valve system is carried out, including pilot valve modeling, load-sensitive multi-path valve modeling and load sensitive variable pump modeling. Then the current software is used to analyze the function of the system, such as pressure difference equal characteristic, flow shunt characteristic, flow anti-saturation characteristic, small load pressure difference automatic compensation characteristic and so on, and the leakage quantity of each valve core is analyzed. The effect of brake, sudden closing of valve port and sudden change of maximum load on the pressure difference and flow rate of main valve core in the course of changing direction of main valve core, and the response speed analysis of main valve core and two-position and three-way reversing valve core. 4. optimal design銆，
本文编号：2450810
[Abstract]:Split ratio load-sensitive multi-circuit valve is a kind of load-sensitive multi-way valve used in the hydraulic system of construction machinery and other multi-actuator mechanical energy-saving type. It greatly improves the speed coordination of multi-actuator when it works at the same time. When the load demand is greater than the maximum flow of the system, the actuators distribute the flow proportionally according to the stroke of the valve stem, so as to ensure the coordination of the operation of the actuators. In this paper, a kind of load-sensitive multi-circuit valve with small load auto-compensation is studied. The main contents of this paper are as follows: 1. Principle research. Based on the analysis of the existing classical load-sensitive multi-channel valves, the defects of them when the maximum load pressure is close to the maximum pressure of the system are found, and a kind of load-sensitive multi-channel valve with small load auto-compensation is studied. It is demonstrated in principle that this scheme not only has all the characteristics of the classical load-sensitive multi-circuit valve, but also has the performance of automatic compensation for small load. 2. Structural design. Based on the analysis of the structure of the load-sensitive multi-circuit valve, the structure diagram of the load-sensitive multi-circuit valve with small load auto-compensation is drawn, including the inlet valve plate, each load valve piece and the load sensitive signal selection valve plate. Then the key parameters such as valve core, valve body fit clearance, flow leakage, throttle shape, size, area curve of valve port, spring stiffness, pre-compression and other key parameters are designed. 3. System modeling and simulation analysis. Firstly, the mathematical modeling of the shunt ratio load-sensitive multi-channel valve system is carried out, including pilot valve modeling, load-sensitive multi-path valve modeling and load sensitive variable pump modeling. Then the current software is used to analyze the function of the system, such as pressure difference equal characteristic, flow shunt characteristic, flow anti-saturation characteristic, small load pressure difference automatic compensation characteristic and so on, and the leakage quantity of each valve core is analyzed. The effect of brake, sudden closing of valve port and sudden change of maximum load on the pressure difference and flow rate of main valve core in the course of changing direction of main valve core, and the response speed analysis of main valve core and two-position and three-way reversing valve core. 4. optimal design銆，
本文编号：2450810
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