SU1580453A1 - Switching device - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices for controlling ferromagnetic objects, such as long products and pipes, and can be used in process automation systems. The purpose of the invention is to increase the sensitivity of the sensor. The moving permanent magnet (PM) 3, placed in a vertically oriented hollow cylindrical body 2 of a nonmagnetic material, is balanced by the counter-magnetic flux of the stationary PM 4. Under the influence of the ferromagnetic body, the PM moves to the extreme upper position and opens the magnetic contact 5. After taking the PT off the action of the switching device PM 3 returns to its initial position under the action of gravity and the MC closes. 2 Il.

Description

2

The invention relates to electrical engineering, in particular, to devices for controlling ferromagnetic objects, for example, long products and pipes, and can be used in systems for automating technological processes.

The purpose of the invention is to increase the sensitivity of the switching device.

1 shows a switching device with a longitudinal section; Fig. 2 shows the position of its elements at the time of its operation.

The switching device 1 contains a cylindrical hollow body

2, mounted vertically, inside which a permanent magnet is placed

3, installed with the possibility of movement, and a fixed permanent magnet 4, facing each other with the same name, poles, and the magnetoequivalent contact 5, installed

in the zone of placement of the permanent magnet 3. The permanent magnet 3 in the initial state occupies an intermediate balanced position in the housing due to the balancing effect of the counter magnetic flux of the fixed permanent magnet 4. At the same time, the magnetically controlled contact 5 is in the closed state. The permanent magnets 3 and 4 are selected in such a way that the mutual attraction force of the permanent magnet 3 and the ferromagnetic body 6, is summed up with the mutual repulsion force of the permanent magnets, exceeds the weight of the permanent magnet 3.

When a ferromagnetic body 6 appears over the device, a magnetic interaction force arises between it and the permanent magnet 3. The magnet 3 moves upward toward the product under test and comes to the outermost position (Fig. 2). Magnetically controlled contact opens. Wherein

five

0

5 d 5

0

five

the operation of the device occurs at such a distance from the product, in which the force of the magnetic interaction between it and the magnet 3 remains less than its own weight. After the ferromagnetic body 6 is removed from the switching device operating area, the permanent magnet 3 returns to its initial position under the influence of gravity, the magnetically controlled contact 5 is closed.

Claims (1)

Invention Formula A switching device triggered by the approach of a ferromagnetic body, comprising a body of non-magnetic material, a magnetically controlled contact and two permanent magnets installed in the body of the same poles towards the other, the magnetization axis of the permanent magnets oriented perpendicular to the direction of movement of the ferromagnetic body These magnets are mounted with the possibility of movement, characterized in that, in order to increase the sensitivity, the housing is arranged vertically, both The magnet is placed on one side relative to the trajectory of the ferromagnetic body, and the second permanent magnet is fixed, the permanent magnet mounted for displacement in the initial state takes an intermediate balanced position in the case, while the permanent magnets are chosen so that the force of mutual attraction of a permanent magnet mounted to move a ferromagnetic body, summed with the force of mutual repulsion of permanent magnets, exceeds t w of the permanent magnet mounted for movement