Mechanical comparision type force standard machine

Abstract

The mechanically comparing force standard machine for the performance detection of weighing sensor, dynamometric sensor and electronic scale includes: a measuring area and a force value generating area with dynamometric sensor, force transmitting mechanism, force applying frame, guide mechanism, ball lead screw, speed reducer and servo motor connected together; and an electric control part including industrial control terminal, computer with industrial control card, programmable controller connected via interface to industrial control card, position control module and photoelectronic measuring feedback system, servo driver and servo motor with signal fed back to the photoelectronic measuring feedback system. By means of digital control technology and precise mechanical transmission technology, the present invention realizes micro displacement feeding of 0.00015 mm/s and dynamic loading in precision of 1 ten thousandth.

Description

technical field [0001] The invention belongs to the technical field of metering and testing, in particular to a mechanical comparison type force standard machine used in weighing, force measuring sensors and electronic scale performance testing technologies. Background technique [0002] The weighing sensor and electronic scale large value performance testing equipment all adopt comparison type force standard machine. The comparison type force standard machine connects the standard sensor and the tested sensor in series on the force standard machine, generates a standard force value through mechanical deformation, uses the standard sensor to detect the standard force value, and realizes the detection of the tested sensor through comparison. The national standard (JJG734-2001) stipulates that the highest level of the force standard machine is 0.03. Representative products of force standard machines currently on the market: mainly include: 300KN piezoelectric ceramic comparis...

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Problems solved by technology

[0003] Whether it is a hydraulic, mechanical, or piezoelectric ceramic force standard machine, there are currently poor long-term stability, or the loading time and loading method do not meet the requirements of the OIML60 international recommendation, and the test data is not consistent with the load cell data produced abroad. With "comparability", it is not conducive to my country's weighing sensors to enter the international market and international exchanges

Moreover, none of the comparative force standard machines produced at home and abroad can really perform creep. Creep is an important indicator in force sensor testing. Creep measurements by domestic and foreign manufacturers are all indirectly measured through recovery. The essence of creep and recovery is There is a difference, the recovery value is less than the creep value, and the difference between creep and recovery is related to the elastomer material, heat treatment, strain gauge, glue, and process

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