SU1216635A1 - Method of measuring length of moving ferromagnetic material and arrangement for accomplishment of same - Google Patents

Abstract

1. A method for measuring the length of a moving ferromagnetic material, which consists in applying a magnetic mark on the ferromagnetic material after passing the previous mark of the base distance, the number of which determines the length of the material, characterized in that, in order to increase the noise immunity and accuracy of measurement, the label is applied by incessant magnetization of the ferromagnetic material to the point of one polarity during the passage of the beginning of the label of the base distance and each subsequent label is applied with the field Nost, opposite the previous one. yu o) od 00 ate

Description

2. A device for measuring the length of a moving ferromagnetic material, comprising a power source, a magnetizing head, a receiving head, an amplifier, characterized in that, in order to increase reliability, the receiving head is provided with two windings, and the device is equipped with a trigger, a switch, a pulse counter and a relay time connected between the 5 trigger input and the zero bus, the second

The invention relates to a measurement technique and can be used to measure the length of a moving ferromagnetic material.

The aim of the invention is to improve noise immunity, measurement accuracy and reliability.

The method is carried out as follows.

The moving ferromagnetic material is continuously magnetized by alternating polarity, i.e. for a certain length it is magnetized with one polarity, and then it reverses with another polarity. The length is determined by the distance between the write and read heads (base distance).

By the number of pulses or magnetization reversal, the length of a moving ferromagnetic material is determined:

L p-6

where L is the length of the ferromagnetic material,

n is the number of pulses, i.e. remagnetization of ferromagnetic material; 6 — base distance — the distance between the G1 and G2 mescades (constant value).

The drawing shows a device for implementing the method.

The device contains a receiving head 1 connected to the installation inputs of the RS-flip-flop 3, controlling the switch 4, the source 5 beer relay switch is connected to the C-trigger input, the outputs of the receiving head are connected to the inputs of the amplifier, one output of which is connected to the 5-input 1DOM and the other with the R input of the trigger, the D input of which is connected to the second trigger output, the first output of the trigger connected to the switch through which the magnetizing head is connected to the power supply, the pulse counter is connected to the first output of the trigger and the input of the switch .

.tani, time relay 6, magnetizing head .7, connected via switch 4 to the counter 8 pulses. The device works as follows.

in a way.

When the drive of the ferromagnetic material is turned on, the measuring device is also set in motion. Due to the fact that the ferromagnetic material may have any random marks or other changes in the magnetization, which can lead to a false count of marks, and consequently, to a failure in the count,

The device is not sensitive for a certain time to changes in the magnetization of a ferromagnetic material. This is achieved by forcing the trigger 3 to hold.

one of the states during the time of passage of the ferromagnetic material is the distance between the heads 1 and 7 using the relay 6 time.

The magnetizing head 7 magnetizes the ferromagnetic material with a certain polarity. After the passage of this predetermined magnetization of the ferromagnetic material, the receiving head 1 triggers the time relay 6, the input S of the trigger 3 opens and a pulse is sent to its input C. The trigger 3 changes to another stable state, the switch 4 changes the polarity of the voltage applied to the magnetizing head 7, T.ei changes the polarity of the magnetic recording. As the ferromagnetic material moves, there will be a transition from one magnetization to

the other, at the moment of passing the polarity of the magnetization of the ferromagnetic material past the receiving head 1, an electric current pulse is induced in the latter, the polarity of which depends on the polarity of the magnetization transition. An impulse of electric current through the amplifier 2 is fed to the installation inputs of the trigger 3 and changes its state. Heads 1 and 7 are connected. So, when passing the polarity of the magnetization at the receiving head 1, the state of the trigger 3 necessarily changes, and therefore, the polarity of the voltage supplied from the power source 5 through the switch 4 to the magnetizing head 7, t . polarity magnets Editor N. Egorov Order 993/51

Compiled by L. Kryukova

Tehred M. Parotsay Corrector I. Erdeyi

Circulation 671 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PSh1 Patent, Uzhgorod, st. Project, 4

216635

ferromagnetic material. And further, when the ferromagnetic material moves, the pulses induced in the receiving head 1 change the field of the magnetic recording by the magnetizing head 7. The length of the moving ferrous material is determined by the number of pulses or magnetic reversal.

to

15

When magnetizing the ferromagnetic material to saturation, there is no need to install the erasing head, since the magnetizing head 7 is also erasing, since it produces continuous magnetization of the moving ferromagnetic material with alternating polarity.

Claims (2)

1. A method of measuring the length of a moving ferromagnetic material, namely, that a magnetic mark is applied to the ferromagnetic material after the previous mark has passed the base distance, the number of which determines the length of the material, characterized in that, in order to increase noise immunity and measurement accuracy, the mark is applied by continuously magnetizing the ferromagnetic material until it is saturated with one polarity during the passage of the reference mark at the base distance, and each subsequent mark is applied with polarity, opposite to the previous one. 2. A device for measuring the length of a moving ferromagnetic material containing a power source, magnetizing head, receiving head, amplifier, characterized in that, in order to increase reliability, the receiving head is made with two windings, and the device is equipped with a trigger, switch, pulse counter and relay time connected between the 5-input of the trigger and the zero bus, the second relay output is connected to the C-input of the trigger, the outputs of the receiving head are connected to the inputs of the amplifier, one output of which is connected to the 5-input, and the other with R -Log trigger, D-input of which is connected to a second output flip-flop, the first flip-flop output is coupled to a switch through which the magnetizing head is connected to a power source, a pulse counter connected to the first output of the trigger input of the switch.