Device for unloading and buffering pull force

Abstract

The invention relates to a device for unloading and buffering pull force, in particular to a static calibration device of a thrust test system of a rocket engine, belonging to the field of sensing measurement and control devices. The device adopts inner and outer dual pressure springs as unloading and buffering elements and comprises a cylinder, an upper cover, a base, an inner spring, an outer spring, a hydraulic cylinder supporting flange and a connecting bolt, wherein the hydraulic cylinder supporting flange used as a support is of a stepped revolving body structure provided with a centralthrough hole; and the base is of a structure, which is provided with an outer surface tapped with screw threads and is provided with a central through hole of the base. The invention realizes the total unloading of loaded force during the in-situ calibration of a work sensor and effectively buffers the impact of the loaded force on the thrust test system and a hydraulic loading system during an unloading moment, and thus, hydraulic oil is prevented from being leaked, the unloading is also stabilized and return-trip calibration can be carried out accurately; and in addition, the device has theadvantages of higher adaptability, wider usage range and certain popularization and use value.

Description

technical field [0001] The invention belongs to the field of sensing measurement and control devices, in particular to a static calibration device for a rocket engine thrust test system. Background technique [0002] Attitude control rocket motors are used for orbit transfer, final velocity correction and attitude control of spacecraft, and are widely used in satellites, rockets and multi-stage vehicles. Accurate measurement of its thrust is helpful to improve the performance of the engine, and the in-situ calibration of the working sensors in the measurement system is a prerequisite to ensure accurate measurement. [0003] At present, a lot of research has been done on the test of rocket engine thrust at home and abroad, and various test systems have also been proposed. Each test system focuses on the design of the in-situ calibration device for the working sensor. In 2005, Li Haitao, a doctoral student at the National University of Defense Technology, proposed an automat...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art, aiming at the self-designed hydraulic loading device, in order to solve the problem that the hydraulic loading device is difficult to overcome its internal friction during the unloading process and cannot be automatically reset, the force impact at the moment of unloading is large, and it cannot be realized. Accurate return calibration and other issues Invented a device to unload the buffer tension

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