SU1255936A1 - Device for measuring number of revolutions - Google Patents

Abstract

The invention relates to the measurement of rotational speed and can be used in the textile industry to measure the number of revolutions of the spindles. The purpose of the invention is to reduce the measurement error and expand the scope. The pulses read by the magnetic head 1 are amplified by the amplifier 2. In the threshold element 6, their amplitude is compared with the allowable sensitivity threshold, at which a stable reading and counting of the pulses is ensured. A stable reading of these pulses is possible when the amplitude of the weakest pulse is greater than the sensitivity threshold of the device. This is achieved by selecting an appropriate air gap between the magnetic head 1 and the magnetic carrier, as indicated by the indicator 7. The pulses read by the magnetic head 1 are amplified and converted into square pulses in the shaper 3 and fed to the counting unit 4, which produces the counting, and on the indicator 5 indicates the number of revolutions made by the spindle per unit of time. 1 il. (L with

Description

The invention relates to the measurement of rotational speed and can be used, for example, in the textile industry to measure the number of revolutions of the spindles.

The purpose of the invention is to reduce the measurement error and expand the scope.

The drawing shows a block diagram of the device.

The device contains a magnetic head 1, an amplifier 2, readable signals, a pulse shaper 3 and a counting unit 4 with a speed indicator 5, which together comprise a pulse counter. The output gap indicator 7 is connected to the output of amplifier 2 through a threshold device 6. The switch 8 serves to switch the magiit head 1 from the amplifier 2 to a single pulse generator comprising a thyristor switch 9 and a high constant voltage source 10. The magnetic head is provided with stops 11 to protect it from contact with the rotating object 12. The indicator 7 of the working gap size is located in the immediate vicinity of the head 15 so as to be in the field of view of the operator during the measurement.

Structurally, the device is made in the form of two blocks: a write block (BS) and a read block (BS). The blocks are interconnected by cable.

The device works as follows.

The magnetic head 1 is supplied to the rotating ferromagnetic drive sleeve of the spindle 12, the switch 8 is set to Record and with the help of the key 9 the short-term discharge of the source 10 of constant high voltage is produced through the magnetic head 1, the discharge duration must not exceed

Compiled by J. Murcuko Editor N. Rogudich Tekhred L. Serdyukova

Order 4816/44

Circulation 778

VNEMELI USSR State Committee

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

Production and printing company, Uzhgorod, st. Project, 4

half-turn of the spindle. In this case, a pulse of the corresponding duration is recorded in the surface layer of the ferromagnetic sleeve. To measure the speed, switch 8 is set to Read. The magnetic head is guided to a rotating surface.

Magnetic head read -. -

the pulses are amplified by the amplifier 2; in the threshold element 6, their amplitude is compared with the permissible sensitivity threshold, at which a stable reading and counting of the pulses of the counting device is ensured. A stable reading of these pulses occurs when the amplitude of the weakest pulse is greater than the sensitivity threshold of the device. This is achieved by selecting the appropriate air gap between the head and the magnetic carrier, as indicated by the indicator 7.

In this position, the magnetic head is maintained for the entire measurement time. The magnetic head read pulses are amplified and converted into square pulses in the imaging unit 3 and are fed to the counting unit 4, which, after starting, produces the counting, and the indicator 5 indicates the number of revolutions performed by the spindle 12 per unit of time.

Claims (1)

Formula invented  A device for measuring the rotational speed, comprising a series-connected magnetic head, amplifier, driver and pulse counter, characterized in that, in order to reduce measurement error and expand the scope of application, a threshold element and an indicator are sequentially connected to the output of the amplifier. Proofreader And, Muska Subscription