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A hydraulic-electric hybrid energy-saving system for lifting mechanism

A lifting mechanism and energy-saving system technology, applied in the direction of current collectors, lifting devices, electric vehicles, etc., can solve problems such as low efficiency, achieve the effects of avoiding throttling loss, stable output, and improving storage utilization efficiency

Active Publication Date: 2019-02-15
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy of this energy recovery method has been converted many times, and the efficiency is low, so it is not suitable for small machinery.

Method used

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  • A hydraulic-electric hybrid energy-saving system for lifting mechanism
  • A hydraulic-electric hybrid energy-saving system for lifting mechanism
  • A hydraulic-electric hybrid energy-saving system for lifting mechanism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 2 As shown, a hydraulic-electric hybrid energy-saving system for a lifting mechanism includes a power source 1, a hydraulic pump 2, a fuel tank 3, an overflow valve 4, a hydraulic circuit 5, two boom hydraulic cylinders 11, a boom 7, A control unit 13, an electric cylinder 8, a motor speed controller 12, a bidirectional DC / DC converter 10, a supercapacitor group 9, a pressure sensor 6, the output shaft of the power source is connected to the hydraulic pump, and the oil outlet of the hydraulic pump is connected to the hydraulic circuit. The oil inlet P is connected to the oil inlet of the relief valve, and the oil outlet of the relief valve is connected to the fuel tank; the oil return port T of the hydraulic circuit is connected to the fuel tank; The pipeline is connected to the working oil port A and the working oil port B of the hydraulic circuit, and the pressure sensor is installed on the pipeline connected to the rodless chamber of the boom hydrauli...

Embodiment 2

[0030] Such as image 3 As shown, a hydraulic-electric hybrid energy-saving system for a lifting mechanism includes a power source 1, a hydraulic pump 2, a fuel tank 3, an overflow valve 4, a hydraulic circuit 5, a boom hydraulic cylinder 11, a boom 7, a control Unit 13, two electric cylinders 8, two motor speed controllers 12, bidirectional DC / DC converter 10, supercapacitor group 9, pressure sensor 6 power source output shaft is connected to the hydraulic pump, and the oil outlet of the hydraulic pump is connected to the hydraulic pressure The oil inlet P of the circuit is connected to the oil inlet of the relief valve, and the oil outlet of the relief valve is connected to the oil tank; the oil return port T of the hydraulic circuit is connected to the oil tank; the rodless cavity and the rod cavity of the boom hydraulic cylinder are respectively The pipeline is connected to the working oil port A and the working oil port B of the hydraulic circuit, and the pressure sensor is...

Embodiment 1 and Embodiment 2

[0032] Embodiment 1 and embodiment 2 all adopt following control method:

[0033] When the lifting mechanism starts to work, the control unit controls the working state of the motor speed controller and the bidirectional DC / DC converter according to the comparison result of the output signal u of the pressure sensor and its preset value: when the boom is lowered, the output signal of the pressure sensor When u is lower than its preset value, the driving motor of the electric cylinder is in the power generation state at this time, and the control unit controls the motor speed controller and the bidirectional DC / DC converter to work, so that the electric energy generated by the driving motor of the electric cylinder is converted by bidirectional DC / DC In this way, the gravitational potential energy of the boom is directly converted into electric energy and partially recovered; when the boom is raised, the output signal u of the pressure sensor is higher than its preset value, and...

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PUM

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Abstract

The invention discloses a hydro-electric hybrid energy saving system for a lifting mechanism. The system is provided with an electric cylinder, an electric speed controller, a two-way DC / DC converter, a super-capacitor module and a pressure sensor; in combination with a corresponding control method, the gravitational potential energy of a movable arm is directly converted into electric energy for charging the super-capacitor module when the movable arm declines; and the super-capacitor module is used for providing the electric energy for a driving motor of an electric cylinder for auxiliary diving when the movable arm rises. The hydro-electric hybrid energy saving system for the lifting mechanism, disclosed by the invention, has the advantages of high storage and utilization efficiency of potential energy of the movable arm, stable output, low installed power, etc.

Description

technical field [0001] The invention belongs to the field of energy recovery of a lifting mechanism, and in particular relates to a hydraulic-electric hybrid energy-saving system for a lifting mechanism. Background technique [0002] At present, widely used excavators, loaders and other operating machinery have a bad working environment, complex working conditions, and severe load changes, which make the engine's working range change greatly, resulting in low energy utilization and poor emission characteristics of the whole machine. At the same time, the lifting mechanism of these equipments is mainly driven by a hydraulic system. During the working process, the boom needs to be raised and lowered frequently. Due to the heavy weight of the boom, the hydraulic system needs to overcome the gravity to do work when driving it up, and part of the hydraulic energy is converted into the potential energy of the working mechanism. , but when it descends, the potential energy of the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66F3/46B66F3/44H02J7/14H02J7/34
CPCB66F3/44B66F3/46H02J7/14H02J7/345
Inventor 权龙刘学成葛磊郝云晓
Owner TAIYUAN UNIV OF TECH
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