SU774845A1 - Apparatus for guiding an electrode along weld - Google Patents

Description

one

The invention relates to devices for directing a welding torch along a line of a welded joint and can be used in welding installations, welding work 5 and other welding machines designed to automate welding of welded butt welds, corner and lap seams.

Various devices 10 for welding torch orientation with respect to the welded joint l} are known, among which mechanical copiers made in the form of rolling rollers 5 or sliding stops are widely used.

In such devices and follow-up systems, the direction of the welding torch along the axis of the welded joint is carried out by mechanical contact of the copying roller or sliding stop with the product. In this case, the mechanical copier may be connected directly to the welding torch (mechanical copying), or 25 this connection is mediated by the tracking system (electromechanical tracking systems).

The main disadvantage of existing copying devices is that

that the copy rollers or stops in contact with the product during the welding process are under the continuous influence of the welding arc and spatter, which requires their location from the arc at a considerable distance (at least 50-100 mm), which reduces the accuracy of copying the welded joint. With a considerable distance between the welding arc and the copy rollers in existing copy devices, it is impossible to provide copying of the joints with variable curvature during welding.

A device 2 for guiding an electrode along a joint is known, comprising a series-connected task unit, a control unit, a correction mechanism and a welding head.

However, this device does not allow to take into account assembly tacks, splashes and other obstacles.

The aim of the invention is to improve the quality of the welded joint by increasing the accuracy of the direction of the electrode along the joint.

To do this, the device includes switches for the beginning and end of the technological element and the generator for controlling the correction mechanism, and the control unit is made of four logic elements OR two delay elements, a trigger and a logic element AND, while the terminals for the beginning element of the technological element are connected to the inputs of the first element OR, the terminals of the position switch of the end of the technological element are connected to the inputs of the second element OR, the output of the first element OR is connected to one of the moves of the third OR element and to the input of the first delay element, the output of the second OR element is connected to the input of the second delay element and to the single trigger input, the output of the first delay element is connected to the zero input of the trigger, and the output of the second locking element is connected to another input of the third OR element , the output of the third element OR and the output of the generator controlling the correction mechanism are connected to the inputs of the fourth element OR, the output of the task unit is connected to the input of the generator controlling the correction mechanism, the output is quad rtogo OR gate and flip-flop output connected to inputs of AND gate whose output is connected with a correction mechanism.

Functional diagram of the device shown in the drawing. The task block 1 is connected to the control generator 2, the output of which is connected to the logic element OR 3, the contacts 4 of the first position switches during welding, which define the beginning of the technological element, are connected to the logical element OR 5, the output of which is connected to the input of the logical element OR 6, and the contacts 7 of the second position of the process switches, which determine the end of the technological element, are connected to the logic element OR 8, the output of which is connected to the delay element 9 and the single input of the trigger 10. The input the logical element OR 6 is connected to the logical element OR 5 and the delay element 9, and the output of element 6 is connected to the input of the element 3. The zero input of the trigger 10 is connected through the delay element 11 with the output of the element 5, and the single output of the trigger 10 is connected to the input of the logical element AND 12, another input of which is connected to the element 3. The output of the element 12 is connected to the input of the correction mechanism 13 and then to the welding head 14.

The device works as follows. On task block 1, the required frequency of the control torch control generator 2 is set, which is determined by the departure of the weld line from the direction of motion of the welding torch without correction. Signals

generator 2 is received on the elements OR 3 and further on the element And 12, which is open when the trigger 10 is installed in the unit. This generator signal provides an adjustment of the welding torch 14 with a given frequency when driving without obstacles.

If it is necessary to go through the technological element, a signal is supplied from the first position switch during welding. This position switch, which defines the beginning of the technological element, should provide an additional activation of the adjustment mechanism in front of the technological element, as well as the disconnection of the correction throughout the entire technological element. Switching on is provided by the circuit: switch 4, element OR 5, element b, element OR 3, element AND 12, correction mechanism 13, welding head 14. Disconnection is provided by the chain: switch 4, element OR 5, delay element 11, zero trigger input 10 and locking the element AND 12. The delay element 11 creates a delay of the signal from the switch 4, which ensures that the same signal arrives at the correction mechanism along the switching circuit described above.

After the technological element is passed, it is necessary to ensure the removal of the ban on adjustment and the forced activation of the adjustment mechanism. This is accomplished by a signal from the second position switch during welding, which stands in the end of the technological element. The removal of the prohibition on adjustment is provided by the circuit: switch 7, element OR 8, single trigger input 10, element AND 12. Switching on is provided by the chain: switch 7, element OR 8, element AND 12, adjustment mechanism 13, welding torch 14. Element Delay 9 ensures that the signal is corrected for the correction from the switch for the time the lock is released.

Thus, the proposed device for guiding the electrode along the joint provides the necessary frequency for correcting the direction of the electrode along the line of the welded joint, bypassing technological elements where correction is impossible, as well as automating the welding of the weld.

Claims (2)

Invention Formula A device for guiding the electrode along the junction, containing a series-connected task block, a control unit, a correction mechanism and a welding head, characterized in that, in order to improve quality by increasing the electrode direction along the junction, switches on the position of the beginning and end of the technological element ( tacks) and a control generator by the correction mechanism, and the control unit is made of four logic elements, two delay elements, a trigger and an AND logic element, while the switch positions of the beginning of the technological element are connected to the inputs of the first element OR, the terminals of the switch of the end of the technological element are connected to the inputs of the second element OR, the output of the first element OR is connected to one of the inputs of the third element OR and the input of the first delay element to the input of the second delay element and to a single trigger input, the output of the first delay element is connected to the zero input of the trigger, and the output of the second delay element is connected to another input of the third element OR, the output of the third element OR and the output of the generator controlling the correction mechanism are connected to the inputs of the fourth element OR, the output of the task unit is connected to the input of the generator controlling the correction mechanism, the output of the fourth element OR and the trigger output is connected to the inputs of the element I, the output of which is connected to the correction mechanism. Sources of information taken into account in the examination of 15 Sevbo P.I. Complex mechanization and automation of welding production, Kiev, Technika, 1974. 2. Lvov N.S. Automating the direction of the welding head, M, Mashi2Q, 1966, p. 12-13, Fig. 5 (6).