A control loop of a loader working device

Abstract

The invention provides a control loop for a working device of a loader, and belongs to supporting facilities of loaders. The control loop comprises a loader working mechanism, a working device driving loop, a control handle and a controller, wherein the loader working mechanism comprises a bottom frame, a large cantilever, a bucket and a tipping bucket mechanism; a large cantilever hydraulic cylinder is connected between the bottom frame and the large cantilever; a tipping bucket hydraulic cylinder is connected between a tipping bucket arm and the large cantilever. The control loop is characterized in that the large cantilever hydraulic cylinder and the tipping bucket hydraulic cylinder are the hydraulic cylinders provided with three storing chambers, namely, a contracting chamber, an extending chamber and a recovering chamber; the recovering chamber of the large cantilever hydraulic cylinder is connected with a large cantilever recovering hydraulic cylinder; the recovering chamber of the tipping bucket hydraulic cylinder is connected to a recovering hydraulic system; the large cantilever recovering hydraulic system and the recovering hydraulic system are both connected to the controller. According to the control loop for the working device of the loader, a hydraulic control loop rather than an existing mechanical structure of the loader is changed, and thus the working efficiency can be improved.

Description

technical field [0001] The invention relates to a hydraulic system for controlling the working mechanism of a loader, which belongs to the supporting facilities of the loader, in particular to a control circuit for the working device of the loader to reduce its working energy consumption. Background technique [0002] On the loader, the working device driven by the hydraulic cylinder needs to frequently reciprocate up and down. Due to the heavy weight of the working device itself, the hydraulic cylinder needs to overcome the gravity to do work when driving it up. When the working device is lowered, the gravitational potential energy of the working device passes through the hydraulic valve section. The fluid is converted into heat energy and consumed, which not only wastes energy, but also increases the oil temperature and increases the system failure rate. If the gravitational potential energy when the boom is lowered can be recycled, there will be considerable energy saving...

AI Technical Summary

Problems solved by technology

[0003] In order to utilize this part of the energy, the patent (CN 103225321 A) and the patent (CN 103215978 A) disclose a method, which uses a special mechanical accumulator to recover the energy of the lowering of the arm of the loader. The mechanical accumulator Various devices that can generate elastic potential energy, such as springs and rubber, can be used, but the power density of mechanical accumulators is low, and it takes up a lot of space. It cannot meet the requirements when the weight is large, and the structure is prone to fatigue.

The existing hydraulic gravitational potential energy recovery and reuse system has a complex structure and control of the hydraulic recovery system, and the energy recovery and reuse efficiency is also low

In order to improve this situation, the invention patent (CN 102561442 A) discloses a method that uses one cylinder for energy recovery and direct reuse, which simplifies the structure of the hydraulic system for energy recovery, but needs to add a third independent cylinder

The method disclosed in the invention patent (CN102518606 A) is similar. The principle of energy recovery by three hydraulic cylinders is realized on the excavator through the method disclosed in the patent (CN102660972 A). Large structural changes will affect the mechanical properties of the lifting mechanism, destroy the structural integrity, and reduce the strength

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