Constant-force wrench used by astronaut in zero-gravity environment

Abstract

The invention relates to the technical field of manned spaceflight, in particular to a constant-force wrench used by an astronaut in a zero-gravity environment. The constant-force wrench comprises a handle shell, a ratchet device, a locking mechanism, an extension bar and a force measuring assembly, wherein the ratchet device is arranged on the handle shell; the force measuring assembly and the ratchet device are arranged in a matched mode to control input torque; and the extension bar is connected with the force measuring assembly through the locking mechanism. According to the constant-force wrench used by the astronaut in the zero-gravity environment, through the arrangement of the force measuring assembly, the force measuring assembly can measure and fix force in the screw tightening process; on the premise that the astronaut cannot accurately sense the magnitude of applied force, force fixing operation needs to be completed on a non-disengaging fastening device in the screwing process, and the torque is controlled within a certain range; and in addition, through the arrangement of the ratchet device and the locking mechanism, alignment operation and vertical force application operation can be rapidly conducted on the extension bar, so that the astronaut can screw nails through the wrench more conveniently and rapidly.

Description

technical field [0001] The invention relates to the technical field of manned spaceflight, in particular to a constant force wrench used by astronauts in a gravity-free environment. Background technique [0002] When astronauts on the space station need to carry out inspection and maintenance tasks on extravehicular equipment, they often need to unscrew the fastening screws between the equipment installation corner and the deck. Among them, installing and removing screws is a routine work for astronauts outside the cabin. And necessary operations, in a special space environment, wearing a pressurized space suit to perform manual screwing operations, which puts forward higher requirements for the wrench tools used by astronauts to go out of the cabin. [0003] Due to the particularity of the wrench use environment and working conditions, in the space environment, after the astronaut wears the space suit and pressurizes, the force perception ability of the hand is very differe...

AI Technical Summary

Problems solved by technology

[0003] Due to the particularity of the wrench use environment and working conditions, in the space environment, after the astronaut wears the space suit and pressurizes, the force perception ability of the hand is very different from that of the bare hand operation. , the wrench needs to have the function of ratchet reciprocating and reversing. In order to ensure the effective work of the screw, when installing or removing the screw, it is necessary to ensure that the direction of the force is on the same axis as the direction of the extension rod, and the special fastening of the space station equipment does not come out. When the device is installed and disassembled, under the premise that the astronauts cannot accurately perceive the magnitude of the applied force, it is necessary to complete the fixed force operation of the fastening device during the tightening process, and the torque must be controlled within a certain range to protect the screws from being twisted or twisted. Bad, but the current constant force wrench on the ground is to set a spring constant force on the handle. This method is difficult for astronauts to grasp the handle, and it is impossible to perform alignment operations and vertical force operations on the extension rod.

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