Movable arm potential energy recycle control device of hydraulic excavator

Abstract

The invention discloses a movable arm potential energy recycle control device of a hydraulic excavator. The device comprises a first check valve (1), a first balance valve (2), a second balance valve (3), a second check valve (4) and an overflow valve (5), wherein an inlet of the first check valve and an outlet of the first balance valve are connected with a movable arm multi-way control valve outlet, an outlet of the first check valve and an inlet of the first balance valve are connected with an inlet of the second balance valve and a bottom cavity of a movable arm oil cylinder, an outlet of the second balance valve is connected with an inlet of the second check valve, an outlet of the second check valve is connected with an energy storage or utilization device, a control port of the first balance valve and a control port of the second balance valve are connected with a movable arm descending pilot oil way, a control oil return port of the first balance valve and a control oil return port of the second balance valve are communicated with an oil tank, and the overflow valve is arranged between the second check valve and the energy storage or utilization device. According to the movable arm potential energy recycle control device of the hydraulic excavator, the controllability is high when a movable arm descends slightly, and when the potential energy of the movable arm is fast recovered, the controllability is not high, the integration degree is high, and the portability is good.

Description

technical field [0001] The invention relates to a hydraulic excavator, in particular to a hydraulic excavator arm potential energy recovery control device, which belongs to the technical field of excavators. Background technique [0002] An excavator is an earth-moving machine that uses a bucket to excavate materials such as soil, coal, sediment, or pre-loosened soil and rocks that are higher or lower than the bearing surface, and is loaded into a transport vehicle or unloaded to a stockyard. It has become one of the most important construction machinery in engineering construction. [0003] Hydraulic excavators have high working efficiency and a wide range of applications. However, the problems of high energy consumption and poor emissions have become more and more necessary to improve in the context of social development with higher and higher requirements for energy conservation and environmental protection. [0004] During the working process of the hydraulic excavator,...

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Problems solved by technology

[0003] Hydraulic excavators have high working efficiency and a wide range of applications. However, the problems of high energy consumption and poor emissions have become more and more necessary to improve in the context of social development with higher and higher requirements for energy conservation and environmental protection.

[0004] During the working process of the hydraulic excavator, the working device needs to rise and fall frequently, and the potential energy increases when rising to a high position, and when falling, in order to prevent the descending speed from being too fast, a throttling speed regulating circuit is usually set up, during the throttling speed regulating process A large amount of potential energy is converted into heat energy, causing the system temperature to rise rapidly, reducing the performance of the hydraulic system, and at the same time increasing the cooling power

[0005] At present, the research on the potential energy recovery control device of the excavator mostly uses the electromagnetic reversing valve or the proportional reversing valve to control the movement of the boom and complete the recovery of the potential energy of the boom at the same time, such as the application number 201120372836.6, authorized on May 30, 2012 Chinese invention patent, which discloses the use of the one-way valve in front of the boom holding valve to realize the automatic switching of the oil inlet and return pipelines of the large chamber of the boom cylinder, and the use of the second two-way hydraulic control reversing valve to realize the accumulator's energy collection, The automatic judgment of the release, but using the electromagnetic reversing valve alone, cannot guarantee the micro-operability of the boom, and will sacrifice the performance of the boom; another example is the Chinese invention patent published on May 25, 2011 with the application number of 201110048582.7. This patent discloses the use of proportional reversing valve control to realize boom potential energy recovery, but the use of proportional reversing valve control requires matching of the opening area of ​​the proportional reversing valve, control signal, and boom kinematic performance. The model must be re-matched, its versatility and portability are not good, and the debugging and manufacturing costs are high

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