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Device for detecting mobile guide part position

A technology for guiding components and components, applied in the direction of measuring devices, using electric devices, using electric/magnetic devices to transfer sensing components, etc., can solve problems such as incorrect operation of proximity switches

Inactive Publication Date: 2009-07-29
LIEBHERR WERK EHINGEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of a wrong signal conversion in the A-D converter or a wrong match between the digital output value and the reference threshold, no error message may be generated, although the proximity switch is not working correctly

Method used

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  • Device for detecting mobile guide part position

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Experimental program
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Effect test

Embodiment Construction

[0017] The proximity switch 10 comprises a proximity sensor 20 which operates on the principle of a damped LC oscillator. In the sensor coil, which is part of the LC oscillating circuit, a harmonic oscillator generates a high-frequency alternating field. When the switching element 30, which acts as a damping surface, is introduced into the alternating field of the sensor coil, eddy current energy is drawn from the system, causing the amplitude of the oscillations to be small. The resulting change in current is evaluated in the subsequent electronics unit.

[0018] figure 1 The switch member 30 shown in has three preferred positions, or elements 1,2,3. figure 1 , the proximity sensor 20 is in a position where the distance of the measuring surface of the sensor 20 from the component 2 can be determined. Elements 1, 2, 3 may comprise transponders. In addition to the elements 1 , 2 , 3 , transponders can also be arranged on the switching element 30 .

[0019] The proximity se...

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PUM

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Abstract

The invention relates to a device for detecting the position of a movable guide member, said device comprising a proximity sensor providing an output signal which is a measure of the distance of an object located in front of the proximity sensor, and said device further comprising a At least one transponder on the movable guide element is designed such that the proximity sensor can read out data stored on the transponder.

Description

technical field [0001] The invention relates to a device for detecting the position of a movable guide member, said device comprising a proximity sensor providing an output signal which is a measure of the distance of an object located in front of said proximity sensor. Background technique [0002] Such a device is known, for example, from DE 19,830,981 C1. The proximity sensor disclosed in said reference is used to detect a predetermined position of a movable guide part of a crane, for example. For example, when extending the length of a telescopic jib, the movement of the required hydraulic cylinders must be monitored and controlled, and the position of the bolts to which the various lengths of the telescopic jib are bolted must be detected. In known devices, the output signal of the proximity sensor is converted into a digital output value by means of an A-D converter, and said output value is compared with a reference threshold, when the digital output value exceeds th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/02G01D5/12
Inventor E·莫拉特
Owner LIEBHERR WERK EHINGEN