Kilowatt-level rock output three-redundancy electro-hydraulic digital servo system

Abstract

A kilowatt-level rock output three-redundancy electro-hydraulic digital servo system is composed of a digital servo controller and a rock output electro-hydraulic servo mechanism. According to the scheme, three independent sub-controllers in the controller carry out control over a servo valve with three front levels on the servo mechanism, and a three-redundancy feedback potentiometer feeds back the position of a piston rod to the three sub-controllers so as to form a closed loop. According to the technical scheme, under the situation that one path of the servo valve is in open circuit, it can still be guaranteed that the system normally works, a dynamic pressure feedback hardware device of a traditional servo valve is eliminated, a software algorithm is adopted for replacement for the controller, and the beneficial effect of flexible parameter adjustment is achieved. In addition, a previous tilting axis constant pump is replaced with a direct-axis variable displacement piston pump in the system, compared with the prior art, rapid starting performance is improved, and self regulation of flow is achieved, wherein a previous overflow valve is eliminated. Finally, a composite seal and a double-way seal are adopted in a key linear movement sealing part in the system to replace a previous O-shaped ring and a previous one-way seal, and compared with the prior art, long-term storage and service life prolonging of products are better facilitated.

Description

technical field [0001] The invention relates to a kilowatt-level swing output triple-redundant electro-hydraulic digital servo system, relates to a servo system for thrust vector control of an aerospace vehicle, in particular to a kilowatt-level servo system for conventional propellant liquid space vehicle engine thrust vector control Fast response linear output triple redundant digital servo system. Background technique [0002] The existing kilowatt-level swing output electro-hydraulic servo mechanism will completely fail when the pre-stage of the servo valve is disconnected. At this time, the reliability of the servo mechanism cannot be guaranteed, and the existing technology uses dynamic pressure feedback hardware for the servo valve. device, not only increases the cost, but also very troublesome to adjust the performance parameters. In addition, the existing kilowatt-level swing output electro-hydraulic servomechanism uses an inclined-axis constant-volume plunger pump....

AI Technical Summary

Problems solved by technology

[0002] The existing kilowatt-level swing output electro-hydraulic servo mechanism will completely fail when the pre-stage of the servo valve is disconnected. At this time, the reliability of the servo mechanism cannot be guaranteed, and the existing technology uses dynamic pressure feedback hardware for the servo valve. device, not only increases the cost, but also very troublesome to adjust the performance parameters

In addition, the existing kilowatt-level swing output electro-hydraulic servomechanism uses an inclined-axis constant-volume plunger pump. The output flow of the inclined-axis constant-volume plunger pump is constant, so the flow adjustment needs to be realized with the help of an additional relief valve, and the inclined-axis The rapid start performance of the plunger pump is relatively slow, which cannot fully meet the current overall requirements for improving the rapid start capability of the servo system in the ready-to-launch state.

Finally, the existing kilowatt-level swing output electro-hydraulic servo mechanism uses a single-channel O-ring seal at the key linear moving sealing part. The sealing reliability of this structure is relatively poor, and leakage needs to be replenished at regular intervals. The oil and gas supply work cannot fully meet the overall requirements for the stability and reliability of the long-term storage of the servo mechanism at this stage

The existing kilowatt-level swing output electro-hydraulic servo mechanism will completely fail when the pre-stage of the servo valve is disconnected. At this time, the reliability of the servo mechanism cannot be guaranteed, and the existing technology uses dynamic pressure feedback hardware for the servo valve. device, not only increases the cost, but also very troublesome to adjust the performance parameters

In addition, the existing kilowatt-level swing output electro-hydraulic servomechanism uses an inclined-axis constant-volume plunger pump. The output flow of the inclined-axis constant-volume plunger pump is constant, so the flow adjustment needs to be realized with the help of an additional relief valve, and the inclined-axis The rapid start of the plunger pump is relatively slow, which cannot fully meet the overall requirements for the rapid response of the servo mechanism at this stage.

Finally, the existing kilowatt-level swing output electro-hydraulic servo mechanism uses a single-channel O-ring seal at the key linear moving sealing part. The sealing reliability of this structure is relatively poor, and leakage needs to be replenished at regular intervals. Oil and air supplement work cannot fully meet the overall requirements for long-term storage of servo mechanisms at this stage, such as figure 1 and figure 2 shown

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