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Water proof electronic digital display callipers

An electronic counting and waterproof technology, which is applied in the field of measuring instruments, can solve the problems of caliper display value deviation, malfunction, ferromagnetic particles and dust sensitivity, etc., and achieve the goal of reducing power consumption, reducing volume and reliability, and stabilizing the process Effect

Inactive Publication Date: 2004-12-15
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The traditional electronic digital caliper has a series of advantages such as stable performance, convenient use, low price, and long continuous working time, but at the same time there is an obvious shortcoming and deficiency: when there is liquid in the use environment, the caliper display value will have a large deviation , doesn't even work at all
This type of sensor has a waterproof function in principle, which can completely solve the waterproof problem, but it is still sensitive to ferromagnetic particles and dust

Method used

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  • Water proof electronic digital display callipers
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Embodiment Construction

[0024] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, the present invention includes a fixed ruler 1, a movable ruler 6, several sensor coils 4, a drive circuit 3, a control circuit 5, a display, a communication interface, buttons, dry batteries and the like. The drive circuit 3 includes a driver and a pulse circuit, and the control circuit 5 includes a single-chip microcomputer, a controller, a sampler, a display circuit, a communication interface, and an interface circuit. A series of metal reflective conductors 2 with regular shapes are evenly arranged on the fixed length 1 along the moving direction of the fixed length; the moving ruler 6 is installed on the fixed length through a mechanical structure, and can slide along the fixed length body; Several eddy current sensor coils 4 are installed on the 6, and these sensor coils 4 are uniformly arranged along t...

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Abstract

A water-proof electronic caliber rule with digital indication is composed of displacement measuring device consisting of electric eddy sensors, metallic reflectors uniformly arranged on fixed rule by a certain wavelength, and several sensor coils installed on moving rule by a particular pitch. When an alternative current flows through said coils, an alternative magnetic field is generated in space to generate an electric eddy on said reflector. When fixed and moving rules move relatively, the magnetic field is modulated under the action of electric eddy, so measuring displacement value.

Description

Technical field: [0001] The invention relates to a waterproof electronic digital caliper, which is one of the conventional necessary tools in departments such as machining, measurement testing, on-line testing, and product inspection, and belongs to the technical field of measuring instruments. Background technique: [0002] Electronic digital caliper is a measuring tool widely used in the industrial field. The traditional electronic digital caliper has a series of advantages such as stable performance, convenient use, low price, and long continuous working time, but at the same time there is an obvious shortcoming and deficiency: when there is liquid in the use environment, the caliper display value will have a large deviation , or even not work at all. This defect largely affects the use of electronic digital calipers in production and processing sites, and limits the further popularization and application of digital calipers in other fields. [0003] At present, some el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B3/20G01B7/02G01B7/14
Inventor 赵辉俞朴马东丽
Owner SHANGHAI JIAOTONG UNIV
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