Position and flow double-close-loop direct-drive volume control electro-hydraulic servo system

An electro-hydraulic servo system and volume control technology, which is applied in the field of electro-hydraulic servo, can solve problems such as low volume efficiency, oil replenishment mechanism and hydraulic lock opening time delay, etc., and achieve simple control, simple and compact structure, and eliminate inherent defects Effect

Inactive Publication Date: 2010-10-20
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the system performance problems caused by the existing direct drive volume control electro-hydraulic servo system due to the lack of low volume efficiency of the hydraulic pump at low speed, and the delay in the opening time of the oil replenishment mechanism and the hydraulic lock. Position and flow double closed-loop direct drive volumetric control electro-hydraulic servo system

Method used

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  • Position and flow double-close-loop direct-drive volume control electro-hydraulic servo system

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specific Embodiment approach 1

[0009] Specific implementation mode one: combined image 3 Describe this embodiment, which includes a controller 1, a servo drive or frequency converter 2, a servo motor 3, a two-way quantitative pump 5, a hydraulic lock 8, an overflow safety mechanism 9, a flow sensor 10, a hydraulic cylinder 11, and an oil replenishment mechanism 13 and a displacement sensor 12; the controller 1 is provided with four input terminals and a control signal output terminal, and the four input terminals of the controller 1 are respectively a control signal input terminal, a displacement feedback signal input terminal, and a first flow signal input terminal terminal and the second flow signal input terminal; the control signal output terminal of the controller 1 is connected to the control signal input terminal of the servo drive or frequency converter 2, and the control terminal of the servo drive or frequency converter 2 is connected to the controlled terminal of the servo motor 3, and the servo ...

specific Embodiment approach 2

[0010] Specific implementation mode two: combination Figure 4 Describe this embodiment, the difference between this embodiment and specific embodiment 1 is that the controller 1 is composed of a first comparator 1-1, an outer loop controller 1-2, a second comparator 1-3, an inner loop controller 1- 4 and a signal processor 1-5; the first comparator 1-1 is provided with two input terminals and a signal output terminal, and the two input terminals of the first comparator 1-1 are respectively control signal input terminals and The displacement feedback signal input terminal is the control signal input terminal and the displacement feedback signal input terminal of the controller 1; the signal output terminal of the first comparator 1-1 is connected to the signal input terminal of the outer loop controller 1-2, and the outer loop control The signal output end of the device 1-2 is connected to an input end of the second comparator 1-3, and an input end of the second comparator 1-3...

specific Embodiment approach 3

[0015] Specific implementation mode three: combination image 3 Describe this embodiment, the difference between this embodiment and the specific embodiment 1 or 2 is that the oil replenishment mechanism 13 is composed of a closed oil tank 6 and an oil replenishment valve 7; the two oil inlets and outlets of the oil replenishment valve 7 are respectively connected to the On the two oil lines between 5 and hydraulic cylinder 11, the third oil inlet and outlet of oil replenishment valve 7 are connected with the inlet and outlet of closed oil tank 6. Other compositions and connection modes are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a position and flow double-close-loop direct-drive volume control electro-hydraulic servo system, belonging to the electro-hydraulic servo field. The invention solves the defect of low volumetric efficiency at lower speed of the hydraulic pump of the existing direct-drive volume control electro-hydraulic servo system and the system performance problem caused by the delay of the starting time of an oil supplementation mechanism and a hydraulic lock. The controller of the system is provided with four input ends and a control signal output end. The control signal output end of the controller is connected with the control signal input end of a servo driver or a frequency converter. The control end of the servo driver or the frequency converter is connected with the controlled end of a servo motor. The power output shaft of the servo motor is connected with the power input shaft of a bidirectional constant flow pump. Two oil passages between the bidirectional constant flow pump and a hydraulic cylinder form a closed loop through the oil supplementation mechanism, the hydraulic lock, an overflow safety mechanism and flow sensors. The output end of the displacement sensor, the output end of a first flow sensor and the output end of a second flow sensor are connected with the three output ends of the controller. Since the flow sensors are added on the original system, the control structure is changed.

Description

technical field [0001] The invention proposes a double-closed-loop control direct drive volume control servo system, which belongs to the technical field of electro-hydraulic servo. Background technique [0002] Hydraulic servo technology has been developed for a hundred years. The development of the traditional hydraulic servo valve control system has been quite mature, and its performance superiority is generally recognized. However, the shortcomings of traditional valve-controlled hydraulic servo systems such as high energy consumption and large auxiliary facilities are obvious to all. [0003] Therefore, a system that combines the advantages of servo motors and hydraulics has emerged at the historic moment, which is the direct drive volume control system. This system is driven by a servo motor to drive a quantitative pump to push a hydraulic cylinder or a hydraulic motor. Its system has the advantages of simple mechanical structure, convenient control, low repair rate...

Claims

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Application Information

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IPC IPC(8): F15B21/08
Inventor 马琛俊陈建华姜继海万保中刘军龙
Owner HARBIN INST OF TECH
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