Load cells and electronic balances

Abstract

The invention provides a load cell and an electronic balance. The load cell includes a bearing portion, a fixing portion, a parallel guide portion, a lever, a connecting spring sheet and a fulcrum spring sheet. The fixing portion includes a tail end portion, an extending portion extending forwardly from the front end face of the tail end portion, and first and second support portions extending forwardly from the front end face of the extending portion respectively. The first support portion, the second support portion and the extending portion form an accommodating space. The bearing portion is at least partially disposed in the accommodating space. The bearing portion is in separating arrangement with the first support portion, the second support portion and the extending portion. The parallel guide portion connects the tail end portion with the bearing portion. The parallel guide portion, the tail end portion and the bearing portion form a housing space, in which the extending portion is disposed. The lever is disposed at the outer side of the housing space. The connecting spring sheet connects the bearing portion with the lever. The fulcrum spring sheet connects the first and second support portions with the lever. The load cell of the invention has the advantages of simple structure, small volume, convenient assembly, low cost and excellent performance.

Description

technical field [0001] The invention relates to a weighing sensor, in particular to a weighing sensor used for an electronic balance. Background technique [0002] At present, the load cells used in electronic balances are basically electromagnetic force compensation type, which are usually assembled from a large number of mechanical parts such as die-casting moldings. Although the manufacturing technology is mature, with the continuous development and improvement of technology, higher requirements are put forward for the weighing sensor used in the electronic balance, such as small size, high precision, large measuring range, low cost, and simple assembly. As a result, the traditional weighing sensor with die-casting as the main assembly component (hereinafter referred to as the fully assembled sensor) is restricted by technological development due to its large size, numerous parts, complex assembly, large assembly tolerance, and unstable quality. [0003] Although some ma...

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Problems solved by technology

In this way, the traditional weighing sensor with die-casting as the main assembly component (hereinafter referred to as the fully assembled sensor) is restricted by technological development due to its large size, various parts, complex assembly, large assembly tolerance, and unstable quality.

[0003] Although some manufacturers have processed highly integrated single-module load cells, such as the load cells described in US6886418B2, DE20007781U1, and US201110315458A1, the main structural parts such as the load-bearing part, the lever, the fixed part, and the parallel guide part are composed of very narrow Wire cutting grooves or CNC machine tool processing grooves are distinguished, but the processing technology is complicated, the processing cost is relatively high, and the scrap rate is high; there are also manufacturers that produce semi-integrated load cells, such as US6472618B1, the main components such as the bearing part, parallel guide The upper part and the fixed part are an integrated structure processed by machining, but the structural layout is unreasonable, and there are defects such as inconvenient assembly, difficulty in achieving a large leverage ratio with a single-stage lever, and poor performance at the four corners.

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