Hydraulic servo drive system and control method
A driving system and hydraulic servo technology, which is applied in the direction of fluid pressure actuation system components, servo motor components, fluid pressure actuation devices, etc., can solve the problems of increasing the difficulty of layout, decreasing the overall stiffness of the system, and slow system response, etc., to achieve Effects of improving reliability, enhancing overall stiffness, and simplifying the system
Active Publication Date: 2017-03-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
Since the compressibility of air is much greater than that of hydraulic oil, the residual air will lead to a decrease in the overall stiffness of the system, which in turn will cause the empty push phenomenon when the power source cylinder is started, resulting in slow system response, decreased total driving capacity and poor precision.
[0006] 2. The traditional hydraulic system has fuel tanks, electro-hydraulic servo valves and other components, the overall structure is relatively complex, and the overall maintainability is poor
[0007] 3. The components in the traditional hydraulic cylinder oil circuit are often connected by hard pipelines, which is difficult to arrange in the wind tunnel, and it is even more difficult to meet the needs of model position adjustment in the wind tunnel
At the same time, there are often requirements for the height relationship of each component during system layout, which further increases the difficulty of layout
Method used
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[0024] see figure 1 As shown, the present invention discloses a hydraulic servo drive system, which is mainly applied to the internal drive requirements of models used in wind tunnel experiments, and can also be applied to other fields that require micro drive systems and have relatively high control requirements.
[0025] The hydraulic servo drive system of the present invention includes a working hydraulic cylinder 1 , a load 2 driven by the working hydraulic cylinder 1 , a first hydraulic oil source 3 and a second hydraulic oil source 4 . Because it is suitable for wind tunnel experiments, the diameter of the selected working hydraulic cylinder 1 should be less than 50mm, and the length should be less than 150mm. The working hydraulic cylinder 1 has a working cylinder body 11 , a piston 12 located in the working cylinder body, and a piston rod 13 extending from the piston out of the working cylinder body 11 and connected to the load 2 . Wherein the piston 12 divides the wo...
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The invention discloses a hydraulic servo drive system, which comprises a working hydraulic cylinder. A working cylinder body of the working hydraulic cylinder is divided into a rodless cavity and a rod cavity. A first hydraulic oil source communicates with the rodless cavity through a first pipeline; a second hydraulic oil source communicates with the rod cavity through a second pipeline; before a load is driven, pressure can be applied into the rod cavity and the rodless cavity at the same time, so that residual air in the rod cavity and the rodless cavity is at a highly compacted state, and the total stiffness of the system is greatly improved. Meanwhile, oil pressures of the rod cavity and the rodless cavity are mutually controlled independently, so that multiple operation modes and functions such as quick starting, stopping, and bearing a dynamic load can be realized through applying an appropriate control method.
Description
technical field [0001] The invention relates to the field of hydraulic transmission. Background technique [0002] In the wind tunnel test, it is often necessary to install the driving system inside the model. Due to the limitation of the model structure, the limitation of the overall size of the wind tunnel, the limitation of the running time of the wind tunnel, and the sensitivity of the flow field to the aerodynamic profile, the system often needs to have "Large push-pull force", "small size", "rapid response", "small overall system volume", "convenient space layout" and other aspects. [0003] Common driving methods mainly include motor drive, cylinder drive and hydraulic drive. Among them, the motor drive has the advantages of high precision, small overall system volume, and convenient layout, but the push-pull force generated by the motor drive is proportional to the volume of the motor, and it is difficult for a motor with a suitable size to provide a push-pull force...
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IPC IPC(8): F15B21/08F15B13/16
CPCF15B13/16F15B21/08
Inventor 谭慧俊庄逸张宇超凌棫王晨曦何小明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS