SU62023A1 - Apparatus for detecting stripped wires - Google Patents

Description

The object of the present invention is ycTpoiicTBO for detecting exposed (devoid of insulation) sections of wires, such as a telephone cable with paper insulation, during their manufacture (on a twisting machine).

The device makes it possible to detect bare areas with a length of 1 mm or more (along the core axis) at any practically possible velocity of the cores.

The device consists of two independent parts: a probe installed directly on the machine near the drum on which the finished product is wound, and the executive body installed by B, at any convenient place.

The probe, which is a metal brush, serves to feel the surface of the wire passing between them, is included in the signal relay circuit, which gives a signal if the probe falls on a bare portion of the wire. According to the invention, in the probe, the brushes are made of thin ferromagnetic plates or the like, placed: a field of a permanent magnet or electrolyte magnet perpendicular to the wire.

The proposed device is shown in the drawing, where FIG. 1 shows the construction of a probe made in accordance with the invention; in fig. 2 - various forms of one of the parts of the probe; FIG. 3 and 4 are diagrams for switching on the probe.

As shown in FIG. 1, the monitored wire I is passed between the poles of a permanent magnet or electromagnet M fed from a direct current source or from an alternating current source through a one-period periodic rectifier; in the latter case, the magnetic field will be pulsating.

Ai 62023

In the air space between the poles L and S of the magnet, thinnest petals L made of soft iron are thicker (suspended), different from 0.01 + 0.03 mm in such a way that, in the absence of controlled veins, the upper petals touch the lower ones slightly. The ends of the petals facing the veins are given a different shape, in order to ensure that these ends touch the exposed portions of the veins (see Fig. 2).

Under the action of a magnetic field, the petals tend to occupy a strictly vertical position.

If there are no bare spots on the controlled wire, then the petals with their ends easily slide along the wire surface without damaging it at all (due to the fact that the mass of the petals is negligible).

When the exposed area appears, the petals under the action of the magnetic field will tend to straighten and come into contact with the exposed wire, thereby creating electrical contact between them and this wire.

The occurrence of electrical contact causes the actuator to operate, and therefore, the machine stops or a signal appears.

The executive body can be executed in one of two options.

In the first embodiment, this body is a high-speed two-winding electromagnetic relay P, connected according to the circuit shown in FIG. 3

Before starting up the machine by pressing the / S button, the relay P is energized due to the fact that one of its windings receives a forced excitation. In the future, this winding receives power through a normally open relay contact and through an additional resistance (which significantly reduces the current required to maintain the relay in the pai6o4eM position.

The second relay winding is turned on in such a way that the flow created by it has the opposite direction to the flow created by the first winding.

When contact K is closed (if the petals L are in contact with the bare area), the secondary winding of the relay gets energized and the relay quickly releases its measles.

When executing an actuator according to this variant, the number of lobes along the length of the cores should be such that the contact duration is sufficient to completely release the relay.

According to the second variant, an electronic device is used as the executive body, which ensures reliable release of the relay P even if the contact duration is vanishingly short (for example, sec.).

FIG. 4 shows a diagram of an executive body according to the second variant, operating from an AC network.

Before starting the machine in motion, pressing the button KP energizes relay P and blocks itself with its normally open contact.

When the contact K is very short-circuited (when the petal is in contact with a bare wire), capacitor Ci instantaneously charges from the bias battery Bs and will hold this charge for a long time. Thanks to this, on the grid of the electron tube 3, a negative offset is applied to the Vits and the relay P will release the measles.

Subject invention

A device for detecting wire sections lacking insulation, consisting of metal brushes connected to a signal relay circuit and used to feel the surface of a wire passing between them, characterized in that brushes are made of thin ferromagnetic plates or the like wire field of a permanent magnet or electromagnet.