Torque wrench based on shape memory alloy

Abstract

The invention discloses a torque wrench based on shape memory alloy. The torque wrench comprises a wrench head, a driving device, a wrench handle and a handheld operation mechanism which are connectedsequentially. The driving device is used for driving the wrench head. The wrench handle comprises a first connecting disc and a second connecting disc which are arranged at the two ends of the wrenchhandle correspondingly. The first connecting disc and the second connecting disc are connected through a plurality of handle shape memory alloy (SMA) wires. The handle SMA wires are sleeved with handle reset springs. At least one installing disc is further arranged between the first connecting disc and the second connecting disc and is provided with installing holes, and the handle reset springscan penetrate through the installing holes to be installed. The driving device comprises a first SMA drive. The first SMA drive comprises a first fixed disc, a first installing seat, a first rotary disc I, a first rotary disc II, a first SMA wire I, a first SMA wire II, a first rotary wheel I and a second rotary wheel II. The first installing seat, the first rotary disc I, the first rotary disc II, the first SMA wire I, the first SMA wire II, the first rotary wheel I and the second rotary wheel II are arranged on the first fixed disc. The torque wrench is small in size and weight, large in output power and provided with the wrench handle of a flexible structure, the angle can be adjusted, and the application requirements of pipelines, small spaces and other working conditions are met.

Description

technical field [0001] The invention relates to the field of wrenches, in particular to a torque wrench based on a shape memory alloy. Background technique [0002] Threaded connections are widely used in mechanical products, and torque wrenches are a common tool to ensure the fastening quality of connecting parts. Existing torque wrenches generally include sequentially connected wrench heads, a driving device for driving the wrench heads, a wrench handle and a hand-held operating mechanism. Since the driving devices generally adopt mechanical, pneumatic, hydraulic and electric forms, there are problems with large volume and difficult operation. Insufficient space, etc., it is very inconvenient when the working space is narrow; at the same time, the wrench handle is a rigid structure, and the angle cannot be adjusted. Shape memory alloy (Shape Memory Alloy, SMA) is a memory material that deforms with temperature changes. It has the advantages of high power-to-weight ratio, ...

AI Technical Summary

Problems solved by technology

Existing torque wrenches generally include sequentially connected wrench heads, a driving device for driving the wrench heads, a wrench handle and a hand-held operating mechanism. Since the driving devices generally adopt mechanical, pneumatic, hydraulic and electric forms, there are problems with large volume and difficult operation. Insufficient space, etc., it is very inconvenient when the working space is narrow; at the same time, the wrench handle is a rigid structure, and the angle cannot be adjusted. Its space adaptability is insufficient, and it cannot meet the torque operation of pipeline bending in oil fields, chemical industries, etc.

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