SU46947A1 - Rail Gauge Measurement Device - Google Patents

Description

The rail gauge gauge according to the invention is mounted on a test car and is a magnetic electric measuring instrument whose magnetic flux depends on the gauge and the turning frame carries an arrow indicating and recording the expansion or contraction of the gauge.

As can be seen from the drawing, which schematically shows the proposed device, it is made in the form of a magnetoelectric measuring device, the open magnetic system of which is formed by elongated extensions Cj and Cj adjacent to each pole, S of the magnet; the ends of the latter are located at distances x /) and /. from the heads of the respective rails.

Frame a, which is a coil with a wire wound around it, rotates on an axis and is supplied with a spring, as is the case with every measuring instrument. An arrow is fixedly attached to the frame, which walks on the dial, graduated so that the middle position is 1524, i.e. corresponds to the width of the normal gauge, the leftmost position is 1504, i.e. corresponds to the narrowing of the gauge by 20 mm, and the rightmost position -1544, i.e. corresponds to i gauge width by 20 mm (this range is 078)

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The end of the arrow is supplied with a tiny inkwell and the arrow, shifted to the right or left, writes a curve on the tape L, moving in proportion to the speed of movement of the test cart.

An ammeter A, a current source B and a resistance / are connected to the contact rings of the frame a, making it possible to establish a certain constant Current strength in the frame.

With a cart, in the case of wider track, the air gaps /, and 4 increase, and there is a flux, the magnetic flux closing through the pole supports C, and the rail Cj and the pair of wheels of the cart decreases. As a result of a decrease in the magnetic flux, the force of interaction between it and the frame a weakens and the arrow moves to the right under the influence of the spring by an amount proportional to the weight loss.

In the case of a narrowing of the track, the air gaps /, and / 2 are reduced, and consequently, the magnetic flux increases. The increase in flow, in turn, causes an increase in the force of interaction between it and frame a, as a result of which the arrow is deflected to the left, overcoming resistance of the spring.

The pole extensions G, and Cs in the form of ferro-magnetized rods can be ordinary iron cages, in the case of the presence of magnetized rails (flaw detection car), or they can be supplied with a winding through which current is flowing in constant magnitude and direction (pore power for 0.1-0.2 kW) or, finally, these rods can be made in the form of permanent magnets.

In all three cases, the results of the instrument readings do not change. The latter two cases can be applied in the absence of magnetized rails.

The maximum speed at which the device will work without failure is about 50-60 km1 hour. The run-up of the wheelset, - and also the vibration of the body cannot affect the correctness of the instrument's readings, as in the case of the correct way there is a pneumatic gap

The / 1 or /, increases, and the gaps, respectively / ,, or L, decrease by the same amount, and therefore the magnetic flux does not change and the needle will be in a quiet state.

The subject matter of the invention.

A gauge for measuring rail track width, distinguished by the fact that it is made in the form of a magnetoelectric measuring instrument having an open magnetic system, forming adjacent extensions to each pole of the magnet, the ends of which are located on the inside of the heads of both rails to ensure magnetic flux interlocking through the specified overhead, rails and wheelset of the test carriage, depended on the air gap between the ends of the extensions and the rail heads, i.e. the width of the and.