SU1293462A1 - Device for measuring thickness of coatings - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the thickness of coatings on an electrically conductive, base by piercing them through with an electrical indication of achieving contact between the indenter and the electrically conducting base. The aim of the invention is to increase the accuracy and enhance the functionality of the device for measuring the thickness of coatings by providing control of the thickness of non-metallic coatings that are weakly conductive with a specific electrical resistance of 0.5-15 µOhm / m on the bases of an arbitrary profile. This ycTpoiiCTBO contains an electrically conductive housing with an iDeventor and an indenter measuring transducer mounted in it. The mechanism for transferring the movement of the indenter to the measuring transducer is made in the form of a spring-loaded sleeve, equipped with a removable end support, the shape of which corresponds to the shape of the base with a controlled coating. The electrical indication unit for reaching the contact between the indenter and the electrically conductive base, connected between it and the device case, contains a power source, a light indicator and a threshold element, the trigger level of which is chosen so that the light indicator lights up when the indenter touches the electrically conductive base. When the device is installed on the surface of a controlled coating, an indenter is inserted into this coating and at the moment of contact between the indenter and the base, which is judged by the lighting of the light indicator, the thickness is read on the scale of the arrow displacement indicator. 1 il. S (l

Description

The invention relates to a measurement technique and can be used to measure the thickness of coatings on an electrically conductive base by piercing them through with an electrical detector with an electrical indication that the indenter reaches a conductive base.

The purpose of the invention is to improve the accuracy and expansion of the functionality by providing measurement of the thickness of weakly conducting (0.5-15 ohm / m) non-metallic coatings on bases of various shapes.

The drawing shows a device for measuring the thickness of coatings, a general view.

The device for measuring coating thickness contains an electrically conductive housing 1 and a measuring transducer 2 mounted in housing 1 by means of a holder 3, Indenter 4 is rigidly fixed in the lower part of the housing, electrically in contact with the housing 1 and made in the form of a steel needle during the measurements, the punctured coating 5 applied to the electrically conductive base 6, the transfer mechanism of the movement of the indenter 4 to the measuring transducer 2 is made in the form of a spring-loaded spring 7 of the sleeve 8, equipped with a removable support a butt 9, the shape of the contact surface 10 which should correspond to the shape of the surface of the electrically conductive base 6. Between the housing 1 and the base 6 turned on the electric display unit 11 to achieve con.

tact between the indenter 4 and the electrically conductive base 6. This node is connected by means of wires 12 and 13 to the device body 1 and the base 6 and contains a power source 14, a light indicator 15 and a threshold element 16, executed according to a Schmidt trigger circuit with an adjustable response level .

A device for measuring the thickness of the coatings works as follows.

Prior to measurements, the origin of the measuring transducer 2 is set. To this end, when the display unit 11 is turned off, the device is placed with end support 9 on any electrically conductive solid surface, for example, a non-working end

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but big size. The mutual arrangement of the measuring transducer 2 and the sleeve 8 is adjusted by means of the holder 3 so that when the indenter 4 is pushed into this surface, the movement of the indicator hand would be no more than a few graduations of the scale. Further, the zero mark of the movable scale of the indicator of the measuring transducer is combined with its arrow.

When measuring, the device is installed with an end support 9 on the cover 5, after which a small force is manually applied to the housing 1, the indenter 4 is smoothly inserted into the coating 5 before it is punctured, as judged by the light indicator 15. The movement of the indenter 4 stop and on the scale indicator of the measuring transducer 2 read the readings. The level of the triggering of the threshold element 16 is selected so that the lighting of the indicator light 15 takes place only at the moment of contact: with the indenter of the conductive base 6. With smaller values of the currents flowing through the electrically conductive coating r and ascending as the indenter into the coating, the threshold element 16 is in the closed state.

The end support 9 is made interchangeable in order to provide the possibility of replacing it with the support of the extrusion form corresponding to the shape of the base 6, thereby achieving improved measurement accuracy and enhanced functionality of the device.

Claims (1)

Invention Formula A device for measuring the thickness of coatings on an electroplating water base by means of their SKOZNOGO procalation, comprising a housing, an indenter and a measuring transducer and an indenter located in it, a perb transmission mechanism: placing an indenter on the measuring transducer and an electrical indication unit to achieve contact between the indenter and the electrical conductor base, characterized in that, in order to increase accuracy and 312934624 expanding the functional possibilities, connected to the input of the elec- tric node by providing a measurement of the tol- thetic indication of the achievement of the thickness of the weakly conductive nonmetallic tact, and the transfer mechanism of the moving coatings on the bases of various puffs is in the form of spring-loaded forms; elements- 5 bushings with interchangeable end support.