Auxiliary Energy-Accumulation And Flow-Enhancement Device For Hydraulic System Of Concrete Pump

Abstract

An auxiliary energy-accumulation and flow-enhancement device for a hydraulic system of a concrete pump is provided. The device includes a connection oil passage 1 having an input end P and an output end B. A check valve 11 is disposed in the oil passage between the input end P and the output end B, and an energy accumulator 10 and an overflow valve 12 having an output end T are connected to the oil passage between the check valve 11 and the input end P. Pressure oil enters from the input end P, the energy accumulator accumulates energy, and power oil is output through the check valve 11. An oil passage pressure of the output end B controls an energy accumulation state of the energy accumulator 10. The overflow valve 12 sets an overflow pressure, and overflowed hydraulic oil flows back to an oil tank from an output end T. In the course of reversing the oil passage of a distribution valve of a working oil passage device, the auxiliary energy-accumulation and flow-enhancement device releases a corresponding amount of power oil for supplementation. When the oil passage of the distribution valve is not reversed, the auxiliary energy-accumulation and flow-enhancement device also provides the power oil to the working oil passage device. Therefore, the technical solution of the auxiliary energy-accumulation and flow-enhancement device is reliable, and the oil pump operates stably.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of Invention[0002]The present invention relates to an auxiliary energy-accumulation and flow-enhancement device for a hydraulic system of a concrete pump.[0003]2. Related Art[0004]The hydraulic system of a concrete pump has a function of driving concrete pumping, distributing, and mixing devices of the concrete pump. Current hydraulic systems can be divided into two types, in which one is composed of a working oil passage device and a mixing oil passage device, i.e., dual-pump oil supply (as shown in FIG. 5), while the other is composed of a pumping oil passage device, a distributing oil passage device, and a mixing oil passage device, i.e., three-pump oil supply (as shown in FIG. 4). Both of the above types do not include an auxiliary energy-accumulation and flow-enhancement device. When a primary pump is working in a constant power control zone, the first type has the disadvantages of insufficient power of oil cylinders of a distribution v...

AI Technical Summary

Benefits of technology

"The present invention provides an auxiliary energy-accumulation and flow-enhancement device for a hydraulic system of a concrete pump. This device helps to solve problems of insufficient power, improves the working state of the hydraulic system, and enhances the working performance and reliability of the hydraulic system of the concrete pump. The device includes a connection oil passage, a check valve, an energy accumulator, and an overflow valve. The device uses an oil pump to provide pressure oil, which enters the device, the energy accumulator accumulates energy, and power oil is output through the check valve. The overflow valve ensures safety by preventing the oil passage from over loading. The energy accumulation capacity of the device changes with the variation of the pressure of hydraulic oil in the device. The oil pressure of the output end controls the energy accumulation state of the energy accumulator. The device provides power oil to the working oil passage device when the oil passage of the distribution valve is not reversed. The device improves the reliability and working performance of the working oil passage device, so that the oil pump can operate in a stable working state to supply oil to the working oil passage."

Problems solved by technology

When a primary pump is working in a constant power control zone, the first type has the disadvantages of insufficient power of oil cylinders of a distribution valve caused by the increasing of an oil pump pressure and the reducing of displacement, and great hydraulic impact of the oil passages.

As for the latter type, a constant pressure pump of the distribution valve shifts the working states between the maximum displacement and the minimum displacement frequently, so the working life is shortened, the failure rate rises, and the efficiency of the oil pump cannot realized sufficiently.

These defects have adverse effects on the working reliability of the concrete pump, and increase the manufacturing cost and maintenance cost.

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