SU1737258A1 - Magnetic device for measuring coating thickness on magnetic materials - Google Patents

Abstract

The invention relates to the field of instrumentation technology and can be used to measure the thickness of coatings on a magnetic base. The purpose of the invention is to increase productivity and simplify the design, due to the fact that a magnetic device comprising a housing 2 and a double-arm lever 4 housed in it, mounted permanently around its axis, is a permanent magnet 3 mounted on one of the arms of the lever 4, the counterweight 6, mounted on the second arm, the guide 8 with the slider 7 mounted on it, and the spring 10, is provided with a second spring 9 with rigidity different from that of the spring 10. The device also includes a push-button mechanism 11, kinematically associated with the slider 7 and the housing 1. 1 Il.

Description

The invention relates to a measuring and control technique, in particular, to devices for controlling the thickness of non-magnetic coatings on a ferromagnetic basis and can be used in all areas of the industry to control the thickness of the applied coating.

A device containing a magnet tube in the form of a cup, as well as two rod permanent magnets and a Hall sensor, is known, in order to increase the sensitivity of the second rod permanent magnet attached to the bottom of the cup on the outside of the magnetic circuit.

However, due to the nonlinearity of the characteristics of permanent magnets, this device does not provide a high accuracy of measurement of the coating thickness.

A device comprising a core hollow body, a hollow ferromagnetic rod, a nonmagnetic rod and a permanent magnet, as well as a displacement meter, made in the form of three windings, conical magnets, shielding discs, and anti-friction guide bushings are known.

This thickness gauge has a complex structure, its operation requires several power sources, as a result of which it is difficult to use such a device.

Closest to the proposed technical entity is a device, the measuring system of which is a spring. The thickness of the spring is determined by the magnitude of the deformation of the spring when the magnet is detached from the measured product.

The disadvantage of this device is the presence of a spring, since it has inertia; its rigidity decreases with long-term operation, which affects the accuracy and performance of measurements.

WITH

with

H SL) H YO SL 00

The purpose of the invention is to increase productivity and simplify the design of the device.

The goal is achieved by the fact that a magnetic device comprising a body and a double-arm lever, a permanent magnet, a counterweight, a guide, a slider, a spring are placed in it, equipped with a second spring with a rigidity different from that of the first spring, and the second the end on the body, both springs cover the guide, and the slide is located between them and interacts with the counterweight.

The drawing shows a diagram of the device.

The device comprises a coupling 1 and a housing 2, in which a permanent magnet 3, a lever 4, a hinge 5 and a movable counterweight 6 are connected in series.

The device comprises a slider 7 mounted on the guide 8 with the possibility of free movement and fixed between the springs 9 and 10 of different rigidity. Slider 7 plays an auxiliary role in the measuring system (moves the counterweight 6 until the magnet 3 is detached from the surface of the test piece), therefore the use of a spring does not affect the measurement accuracy.

The springs in this device act as a damper. The device also includes a push-button mechanism 11, kinematically associated with the slider 7 and the housing 1.

The device works as follows.

Before starting the measurement, the slider 7 is moved along the guide 8 to the extreme left position and fixed there by a push-button mechanism 11. The counterweight 6 also moves to the extreme left position prior to contact with the slider 7.

The device is attached to the surface of the test article 12 by the end face of the coupling 1. The permanent magnet 3 is attracted to the surface of the product 12. Pressing the button 13 releases the slide 7, which by the force of the tension spring 10 moves along the guide 8 together with the counterweight 6. Spring 9 serves to reduce the force of the tension spring 10, the leverage of the action of the counterweight 6 on the lever 4 increases, and the lifting force of the permanent magnet 3 increases proportionally. For some value of the lifting force, the magnet 3 detaches from the surface under study 12. Kon The act of the slider 7 with the counterweight 6 stops as the lever 4 falls on the surface of the housing 2. The angle of deflection of the lever 4 from the horizontal when it falls does not exceed 10, therefore the component of the weight of the weight of the counterweight 6 along the lever 4 will be less than the force of friction of the counterweight 6 about lever

4. In this case, the slider 7 can move along the guide 8, without affecting the accuracy of the readings, since after the counterweight drops, the contact with the slider 7 is interrupted. Since the thickness of the coating is proportional to the force of separation, the thickness of the coating can be measured by the position of the counterweight 6 relative to the scale 14.

Thus, the proposed device, in comparison with the known one, has the following advantages: it does not contain an extension spring, the stiffness of which determines the magnet's detachment force from the product under test; easy to use

when measured in a horizontal position; the design of the device allows, if necessary, to increase its accuracy by increasing the length of the lever and reducing the weight of the counterweight.

A feature of the instrument is the measurement of the thickness of coatings only on horizontal surfaces.

Claims (1)

Claims Magnetic Measuring Device the thickness of the coatings on magnetic materials, comprising a housing and a double-arm lever placed in it, mounted pivotally around its axis, a permanent magnet mounted on one of lever arms, a counterweight mounted on the other lever arm, a guide mounted for movement along the slide rail, and a first spring fixed at one end on the slide, and the other end on the housing, characterized in that, in order to improve performance and simplify the design, it is provided with a second spring with a rigidity different from that of the first spring, one end fixed to the slider, and the other end on the housing , and the slider is located between them and interacts with the counterweight.