SU998050A1

SU998050A1 - Apparatus for automatic measuring of energy at butt welding

Info

Publication number: SU998050A1
Application number: SU813341899A
Authority: SU
Inventors: Михаил Федосеевич Кареев; Алексей Сергеевич Филатов; Валентин Сергеевич Скворцов; Николай Сергеевич Кабанов; Александр Васильевич Пискунов
Priority date: 1981-09-30
Filing date: 1981-09-30
Publication date: 1983-02-23

Description

Изобретение относитс к стыкбвоЗ электросварке и может быть использо-v вано в системах регулировани энергии оплавлени на стыкосварочных машинах . .The invention relates to welding seam welding and can be used in welding energy control systems on welding machines. .

Известно устройство дл измерени энергии с использованием датчиков тока и напр жени сварки, умножител и четырехканального интегратора с коммутатором каналов. При измерении энергии при сварке широких полос , когда приходитс иметь дело с весьма значительными величинами тока сварки, единственным практически пригодным датчиком тока осталс .пойс Роговского, позвол ющий получить достаточно просто сигнал, пропорциональ elicA device for measuring energy using current and voltage sensors for welding, a multiplier and a four-channel integrator with a channel switch is known. When measuring energy when welding wide lanes, when dealing with very significant values of the welding current, the only practically suitable current sensor remained. Rogowsky's flight, which allows you to get a fairly simple signal proportional to elic

(шй --тг Aii восстановлени сигнала(Shy - Aii signal recovery

тока необходимо, в этой случае, выполн ть операцию интегрировани при соблкщении нулевых начальных условий }.current, in this case, it is necessary to perform an integration operation when zero initial conditions are met}.

Недостатком известного устройства вл етс невозможность измерени энергии при больших TOKEix сварки из-за отсутстви пригодных дл практики датчиков, измер нщих непосредственно ,ток сварки. Использование же дл этих целей по сов Роговокого по известным схемам не позвол ет построить требуемый измеритель энергии. Все известные подобные схемы имеют запуск от кнопки и выход в виде стрелочного показывающего прибора.A disadvantage of the known device is the impossibility of measuring the energy at large TOKEix welding due to the lack of sensors suitable for practice, which measure directly the welding current. The use of Hornovy for these purposes, according to well-known schemes, does not allow building the required energy meter. All known similar schemes have a start from the button and an exit in the form of a switch indicating device.

Целью изобретени вл етс повышение точности измерени за счет снижени диапазона изменени входного сигнсша. ,The aim of the invention is to improve the measurement accuracy by reducing the range of variation of the input signal. ,

10ten

Поставленна цель достигаетс тем, что в устройстве дл измерени энергии при стыковой сварке, содержащем датчики напр жени на стыке и тока сварки, умножитель, ключ, два The goal is achieved by the fact that in a device for measuring energy during butt welding, containing voltage sensors at the joint and welding current, a multiplier, a key, two

15 интегратора и коммутатор, причем выход датчика тока через первый интегратор и выход датчика напр жени соединены с входами умножител , выход последнего соединен с входом второго 15 integrator and switch, the current sensor output through the first integrator and the voltage sensor output connected to the multiplier inputs, the output of the latter connected to the input of the second

20 интегратора, вход коммутатора соединен с входными клеммами устройства, коммутатор выполнен на последовательно соединенных нуль-органе, делителе частоты и формирователе импуль25 сов, при этом последний через ключ соединен с управл кшшм входом первого интегратора, а нуль-орган с входом коммутатора.20 of the integrator, the switch input is connected to the input terminals of the device, the switch is connected in series with a zero-body, a frequency divider and a pulse shaper, the latter is connected via a switch to the control input of the first integrator, and the zero-organ with the switch input.

Claims

The drawing shows a diagram 30 Devices. The device contains a welding voltage sensor 1 and Rogovsky 2 with the first integrator 3, which are connected to the multiplier 4 inputs connected to the second integrator input 5. A switch 6 is connected to the control input of the First integrator the main device of a series of 7 impulses, a frequency divider and a zero-organ 9, which is connected to the supply transformer network, i.e. input terminal device. The device works as follows. In the process of melting during welding in the Rogovsky ng1, the emf is proportional to the time derivative of current. This emf is fed to the dt rotor of the first integrator, where the received signal is continuously integrated. At the same time, the supply voltage of the welding transformer network is fed to the zero-organ 9. At the moments of zero-voltage transition, a pulse appears at the zero-organ output, which is fed to frequency divider 8 to reduce the frequency in the ratio of 20: 1. WITH . the output of the divider pulses through the pulse shaper is supplied to the key b, the output of which is connected to the control unit to the input of the first integrator. When a pulse arrives, the integrator is set to zero when the mains voltage passes through zero. Taking into account that cos in the process of melting differs little from unity, the installation of the integrator to zero occurs at the moment of crossing the welding current through zero. This instant of time. Also corresponds to the phase L / 2 (at the fundamental harmonic) of the ciir signal relative to the phase of the welding current. Such control allows the integrator to work always at zero initial conditions. The time of setting the integrator to zero is chosen sufficiently small so as not to introduce noticeable (Distortions in the measurement results. For that purpose, the frequency was inserted into the device. Next, the current and welding voltage signals, respectively, from the outputs of the integrator 3 and sensor 1, go to inputs of the multiplier 4, on which the instantaneous power signal is formed. This signal is fed to the input of the second integrator 5, where the integration operation is performed according to the formula where p is the instantaneous power} W is the energy for the period. The device allows to receive a signal in the form of a DC voltage proportional to the energy released in the junction during the period in continuous mode and zero initial wels and using Rogowski jets as current sensors. welding, containing voltage sensors and welding current, a multiplier, a key, two integrators and a switch, the output of the current sensor through the first integrator and the output of the voltage sensor connected to the inputs of the multiplier, output The latter is connected to the input of the second integrator, the input of the switch with the input terminals of the device, which, in order to improve the measurement accuracy by reducing the range of change of the input signal, the switch is made on the serially connected null-organ, the frequency divider and the pulse shaper, with In this case, the latter is connected via a key to the control input of the first integrator, and the null organ is connected to the input of the switch. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 369416, cl. In 23 K 11/04, 01/29/76 (prototype) .. J.