Energy recovery and utilization system for movable arm potential energy

Abstract

The invention provides an energy recovery and utilization system for movable arm potential energy. The oil outlet of a movable arm locking valve (1), the rodless cavity oil opening of a movable arm oil cylinder (13) and the oil inlet of a second hydraulic-control reversing valve (3) are communicated with one another; the controlling oil opening of the movable arm locking valve (1) is connected with the oil outlet of a first hydraulic-control reversing valve (2); the controlling oil opening the first hydraulic-control reversing valve (2) is connected with the oil inlet of the first hydraulic-control reversing valve (2) and the controlling oil opening of the second hydraulic-control reversing valve (3); the second hydraulic-control reversing valve (3) is connected with a first one-way valve (4); the first one-way valve (4), an energy accumulator (7), a second one-way valve (8) and a hydraulic motor (10) are communicated mutually; the oil outlet of the hydraulic motor (10) is connected with an oil tank; the controlling oil opening of the second hydraulic-control reversing valve (3) is connected with a movable arm handle (14). The energy recovery and utilization system can control recovery action according to the action of the movable arm oil cylinder, is simple in structure, low in manufacturing cost, and relatively high in portability.

Description

technical field [0001] The invention relates to an excavator, in particular to a system for recovering and utilizing potential energy of a boom. Background technique [0002] The working device of the hydraulic excavator is heavy and moves frequently. During the working process of the hydraulic excavator, the working device frequently rises and falls, and the potential energy increases when it rises to a high position. speed circuit. A large amount of potential energy is converted into heat energy during throttling and speed regulation, which will cause the temperature of the system to rise, reduce the performance of the hydraulic system, and increase the heat dissipation burden of the system. The gravitational potential energy in the descending process is lost due to throttling and speed regulation and is converted into heat energy, resulting in a great waste of energy. [0003] Some current excavator arm potential energy recovery systems have the following deficiencies: ...

AI Technical Summary

Problems solved by technology

During throttling and speed regulation, a large amount of potential energy is converted into heat energy, which will cause the temperature of the system to rise, reduce the performance of the hydraulic system, and increase the heat dissipation burden of the system

The gravitational potential energy during the descent process is converted into heat energy due to throttling and speed regulation, resulting in a great waste of energy

[0003] Some current excavator arm potential energy recovery systems have the following deficiencies: 1. There are many energy conversion and energy utilization links in this type of system, the system structure is complex, and the production cost is also high; 2. In the energy recovery part, usually Electromagnetic reversing valve or proportional reversing valve is used to realize the control of potential energy recovery. When using proportional reversing valve, it is necessary to make the opening area of ​​proportional reversing valve consistent with the kinematic performance of the system, which requires comparison of proportional reversing valve. The corresponding matching of the control signal and the kinematic performance of the boom, this matching process will not only take a lot of time, but also the process is extremely cumbersome, especially for different types of excavators, each type of excavator Matching is required, which makes the portability of these systems poor; and the application of electromagnetic reversing valves usually cannot accurately judge the micro-movement and fast movement of the boom, which will seriously restrict the performance of the boom and reduce the impact on the boom. The efficiency of boom potential energy recovery will also have a certain impact on the normal working system of the excavator; in addition, during the energy recovery process, due to the rapid movement of the boom, the oil port of the rodless chamber of the boom cylinder will be connected to the main The valve body between the valve systems leaks due to excessive pressure, which further reduces the efficiency of the potential energy recovery of the boom; 3. The energy utilization part will produce a large amount of energy loss during the energy release process, and there is no Overload protection function, which will have a certain impact on the original system

Images