SU920358A2

SU920358A2 - Diameter measuring apparatus

Info

Publication number: SU920358A2
Application number: SU802965381A
Authority: SU
Inventors: Надежда Ивановна Солодкая; Геннадий Иванович Разумов; Сергей Германович Попов
Original assignee: Предприятие П/Я Г-4614
Priority date: 1980-07-30
Filing date: 1980-07-30
Publication date: 1982-04-15

Description

(54) УСТРОЙСТЮ ДЛЯ ИЗМЕРЕНИЯ ДИАМЕТРА(54) DEVICE TO DIAMETER MEASUREMENT

ii

Изобретение относитс к измерительной технике и может быть использовано, например, дл измерени диаметра и толщины нитевидных изделий в процессе их изготовлени .The invention relates to a measurement technique and can be used, for example, to measure the diameter and thickness of thread-like products during their manufacture.

По основному авт. св. N 708142 известно устройство дл измерени диаметра, содержащее преобразователь линейного перемещени с измерительными наконечниками, выполненными в виде преобразователей давлени , три усилител , суммирующий блок, св занный с выходами усилителей, измерительный прибор, подключенный к выходу сумАШрующего блока, задатчик диаметра {1}.According to the main author. St. N 708142 discloses a device for measuring the diameter, containing a linear displacement transducer with measuring tips made in the form of pressure transducers, three amplifiers, a summing unit associated with the outputs of the amplifiers, a measuring device connected to the output of the summation block, the diameter setting device {1}.

Существенным недостатком устройства вл етс низка надежность, обусловле ша и носом измерительных наконечников в результате значительного трени их об измер емое изделие. A significant drawback of the device is its low reliability, due to the shaft and nose of the measuring tips as a result of considerable friction between them and the product being measured.

Целью изобретени вл етс повыщение надежности устройства и точности измерений.The aim of the invention is to increase device reliability and measurement accuracy.

Поставленна цель достигаетс тем, что устройство снабжено источником переменного тока, подключенными к нему встречно двум катуцпсами индуктивности, а измйрительиыеThe goal is achieved by the fact that the device is supplied with an alternating current source, connected to it oppositely by two catuts and inductances, and

наконечники выполнены с ферромагнитными штокакш, установленными в катушках индуктивности .lugs are made with ferromagnetic stocks installed in the inductors.

На чертеже представлена схема устройстЬа.The drawing shows a device diagram.

Устройство содержит измерительные наконечники 1 и 2 с преобразовател ми давлени - пьезоэлектрическими элементами 3 и 4, задатчик 5 диаметра, преобразователь 6 линейного перемещени , усилители 7, 8 и 9, суммирующий блок 10, измерительный прибор The device contains measuring tips 1 and 2 with pressure transducers - piezoelectric elements 3 and 4, diameter setting unit 5, linear displacement transducer 6, amplifiers 7, 8 and 9, summing unit 10, measuring device

10 11, (блоки 6-11 образуют вторичный прибор 12), штоки 13, выполненные из ферромагнитного материала, катушки индуктивности 14 и 15, источник 16 переменного тока, при этом катуи си индуктивности 14 и 15 подключеиы 10 11, (blocks 6-11 form a secondary device 12), rods 13, made of ferromagnetic material, inductors 14 and 15, AC source 16, while the inductors 14 and 15 are connected

IS к источнику 16 переменного тока встречно, цггоки 13 выполнены из ферромагнипюго материала .IS to the AC source 16 is opposite, the chucks 13 are made of ferromagnet material.

Устройство работает следующим образом.The device works as follows.

Установка номинального значени диаметра Setting the nominal diameter

Claims

It is produced by the setting device 5. The installation of the predetermined force of pressing the measuring tips 1 and 2 to the surface of the measured part is carried out in statics (at the beginning of the adjustment) by the pressure element of the linear displacement transducer 6. In the process of moving the measured product from the AC source 16, the voltage is applied to the inductors 14 and 15, due to the fact that the rods 13 are made of a ferromagnetic material, the measuring tips 1 and 2 vibrate in antiphase with the frequency of change of the magnetic field created by coils 14 and 15 in the direction perpendicular to the surface of the product being measured. The optimum (resonant) frequency of vibration of measuring tips 1 and 2 depends on the mass of measuring tips 1 and 2 of the speed of movement of the measured product, the pressing force of measuring tips 1 and 2 on the surface of the measured product and the material properties of the moving product. Between the measuring tips 1 and 2, due to the inertia of the elements of the linear displacement transducer 6, the pressing force varies by a factor of 2-3 compared with a predetermined force, which ensures that the output of the piezoelectric elements 3 and 4 produces corresponding correction signals. At the same time, from the measuring tip 2, the linear displacement of the tip 2 is signaled to the input of the linear displacement transducer 6 by changing the product diameter in comparison with the nominal value set by the setting device 5. The electrical signals from the transducer 6 and the piezoelectric elements 3 and 4 of the tips 1 and 2 are respectively to the inputs of amplifiers 7, 8 and 9, from the outputs of which the signals are fed to the moves of the summing unit 10, From the output of the sumMs of the building block 10, the corrected signal of linear movement to The end 2, taking into account the sm, is fed to the measuring instrument I, where the deviation of the product diameter from the nominal value is indicated. The magnitude of the deviation, indicated on the measuring device 11, is the algebraic sum of the amplitudes of the signals of the forward movement of the tip 2 and the signals on the surface of the measured product, modulating the movement signal. The magnitude of the surface of the measured product at given pressures depends on the material, the thickness of the design of the product and the speed of its movement, which is taken into account by appropriate switches on amplifiers 7 and 8. Ferromagnetic rod material is selected depending on the frequency of the signals of the alternating current source 16 13 with the necessary magnetostrictive properties. The formula of the invention and the device for measuring the diameter of the ed. St. No. 708142, differing from the fact that, in order to increase device reliability and measurement accuracy, it is provided with an alternating current source connected to it oppositely by two inductance coils, and the measuring tips are made with ferromagnetic rods fitted in inductors. The sources of information taken into account during the examination 1. Copyright certificate, USSR fP 708142, cl. G 01 B 7/12, 1978 (prototype).