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Distributed direct drive excavator hydraulic system with servo motor-driven double variable pumps

A servo motor and hydraulic system technology, applied in the hydraulic field, can solve the problems of inability to recover negative loads and high motor performance requirements, and achieve the effects of less pressure loss, less heat generation, and high system efficiency

Pending Publication Date: 2018-08-21
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

②When the system pressure is high, the torque required to drive the fixed displacement pump is large, which requires high motor performance, such as a wide range of torque and power, and the system cannot recover the energy fed back by negative loads

Method used

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  • Distributed direct drive excavator hydraulic system with servo motor-driven double variable pumps
  • Distributed direct drive excavator hydraulic system with servo motor-driven double variable pumps
  • Distributed direct drive excavator hydraulic system with servo motor-driven double variable pumps

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Embodiment Construction

[0022] see figure 1 As shown, the present invention provides a distributed direct-drive excavator hydraulic system with a servo motor driving a dual-variable pump, including a controller 1, a power supply unit (not shown) and at least one hydraulic module 2; the hydraulic module 2 Including a hydraulic cylinder 21, a first two-way variable pump 25, a second two-way variable pump 26, a servo motor 27, a frequency converter 28 and an accumulator 29; the hydraulic cylinder 21 includes a cylinder body 211, a piston 212 and a piston rod 213, one end of the piston rod 213 is fixedly connected to the piston 212, the piston 212 is airtightly and slidably connected in the cylinder body 211, and the piston 212 connects the cylinder body 211 The interior is divided into a first chamber 2111 and a second chamber 2112;

[0023] The frequency converter 28 and the controller 1 are respectively electrically connected to the power supply device (not shown), the frequency converter 28 is elect...

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Abstract

The invention provides a distributed direct drive excavator hydraulic system with servo motor-driven double variable pumps, wherein a first bidirectional variable pump, a second bidirectional variablepump and a servo motor are directly connected to independently drive a hydraulic cylinder, the flow balance of the hydraulic cylinder is realized by the first bidirectional variable pump and the second bidirectional variable pump, and meanwhile the servo motor is adopted for driving, so that the distributed intelligent control of transmitting power by a wire instead of a hydraulic pipeline is achieved; a main loop of the system is short and is not provided with a throttling element, so the pressure loss is small, the heat generation is small, a cooling device is not needed, the throttling loss and the overflow loss of the system are avoided, the system efficiency is relatively high, and in case of negative load, the system can also convert potential energy fed back by the load into electrical energy and store the electrical energy in a power supply device for reuse, thus saving energy.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a distributed direct-drive excavator hydraulic system in which a servo motor drives a double-variable pump. Background technique [0002] As the most commonly used machinery in construction machinery, hydraulic excavators have the disadvantages of high fuel consumption, poor emissions, and low energy utilization. Under the situation of energy shortage and increasingly serious environmental pollution, how to realize the energy saving and emission reduction of excavators has attracted more and more attention, and has become a hot research topic at present. [0003] The current excavator still uses the driving system of engine-variable pump-multi-way valve-actuator. Due to the requirements of energy saving and environmental protection, some studies have used ordinary motors to replace engines, but the system efficiency still needs to be improved. With the successful development...

Claims

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Application Information

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IPC IPC(8): F15B1/02F15B11/17F15B13/06F15B21/08E02F9/22
CPCF15B1/022F15B11/17F15B13/06F15B21/08E02F9/22E02F9/2217E02F9/2267E02F9/2292F15B2211/212F15B2211/20515F15B2211/20546
Inventor 张树忠黄豪杰练国富唐一文晏岱
Owner FUJIAN UNIV OF TECH
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