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Control method and device for recognizing the working condition of bucket rod hydraulic cylinder of excavator

A control method and technology of hydraulic cylinders, which are used in fluid pressure actuation devices, mechanical equipment, fluid pressure actuation system testing, etc., can solve the problems of inaccurate identification of controller operating conditions, unstable operation of hydraulic cylinders, and frequent switching. , to achieve the effect of improving displacement accuracy, reducing pressure and speed fluctuations, and improving accuracy

Active Publication Date: 2022-01-28
YANSHAN UNIV
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Problems solved by technology

[0003] However, the status of the stick is judged according to signals such as pressure and speed. When the collected signal fluctuates near the threshold, the controller will not recognize the working condition accurately, which will lead to frequent switching between different states of the system, spool vibration, hydraulic cylinder not running smoothly

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  • Control method and device for recognizing the working condition of bucket rod hydraulic cylinder of excavator
  • Control method and device for recognizing the working condition of bucket rod hydraulic cylinder of excavator
  • Control method and device for recognizing the working condition of bucket rod hydraulic cylinder of excavator

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Embodiment Construction

[0048] In order to elaborate the technical content, achieved purpose and effect of the present invention, the following will be described in detail in conjunction with the accompanying drawings.

[0049] The invention relates to a control method suitable for identifying and judging working conditions of an excavator stick hydraulic cylinder and automatically selecting corresponding control signals for different working conditions. The control method controls the stick hydraulic cylinder 10 and can realize continuous and stable operation of the stick Require. The control method consists of two parts, a hydraulic module and a control module. The hydraulic module consists of a three-phase asynchronous motor 2, an electric proportional variable pump 1, a stick hydraulic cylinder 10, a safety valve 3, a back pressure valve 5, a displacement sensor 9, and a three-position Composed of three-way electromagnetic reversing valve and pressure sensor. The control module is composed of fi...

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Abstract

The invention provides a control method and device for recognizing the working condition of a bucket rod hydraulic cylinder of an excavator. The method comprises the following specific steps: S1, the pressure of an outlet of an electric proportional variable pump, the pressure of the bucket rod hydraulic cylinder and the pressure of an oil return tank are collected through a pressure sensor, and the displacement of the hydraulic cylinder is collected through a displacement sensor; s2, the actual displacement signal, collected by the displacement sensor in the S1, of the hydraulic cylinder is compared with the expected displacement signal, and the working condition type of the bucket rod hydraulic cylinder is judged; and S3, corresponding control signals are sent out according to the working conditions, obtained in the S2, of the bucket rod hydraulic cylinder. The device comprises an electric proportional variable pump, a three-phase asynchronous motor, a safety valve, a pressure sensor, a back pressure valve, a three-position three-way electromagnetic directional valve, a displacement sensor, a bucket rod hydraulic cylinder and a controller. In the process of switching among different working conditions, the working condition recognition result accuracy is improved, the phenomenon that the hydraulic cylinder is frequently switched among the different working conditions is avoided, the pressure fluctuation condition is improved, and the hydraulic cylinder runs more stably.

Description

technical field [0001] The invention belongs to the technical field of intelligent identification and control of working conditions of a hydraulic system, and in particular relates to an intelligent control method for identifying the working conditions of an excavator arm hydraulic cylinder, and in particular to a method for smoothly switching between different complex working conditions. control device. Background technique [0002] At present, the control of the arm hydraulic system of the excavator with independent valve port is mainly based on the collected pressure, speed, and displacement signals, and the controller uses the set threshold to distinguish different working conditions of the arm hydraulic cylinder, and then the controller outputs the corresponding The control signal of the working condition makes the stick move according to the predetermined trajectory. The advantages of using the method of setting the threshold to identify the working condition of the h...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B21/02F15B21/00F15B19/00
CPCF15B21/02F15B21/001F15B19/007
Inventor 李永泉胡双陈宁超陈伯文王力航张立杰袁晓明
Owner YANSHAN UNIV
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