SU893444A1 - Device for remote setting of welding current value - Google Patents

Description

(54) DEVICE FOR REMOTE INSTALLATION WELDING CURRENT SIZE

I

The invention relates to the welding industry, in particular to the remote control of the welding current through the welding circuit.

Devices are known for remotely setting a welding current value along a welding circuit.

In these devices, the task of setting the amount of welding current in an electric arc welding machine is solved, which is equipped with a welding throttle, the movable element of which is set using a reversible motor switched by reversing contactors.

The control of the moving element of the throttles from the welding area without additional wires is carried out with the help of a sectioned resistance, which is connected between the welding electrode and the ground 1.

A device is known for remotely regulating the current in a circuit of a welding transformer, in which an induction motor moves a magnetic shunt through a reducer. Limit switches are set at the end points for moving the shunt to turn off the engine. The setting of the welding current is made by touching the electrode to an external resistance (external resistance) 2.

A disadvantage of the known devices is the setting (selection) of the current value, carried out without visual control of the set value. As a result, the selection of the current is carried out blindly in several steps with the obligatory excitations of the arc.

Closest to the present invention is a device for remotely setting the welding current. It contains a power source for the welding arc, electrically connected with a ballast resistor - a welding current regulator, a step finder, a control unit for a step-by-step driver, an electrode holder with a wire connected to the output terminal of the welding circuit and a remote resistor 3.

Structurally, the device is an additional attachment to the welding ballast resistors. In the console

20 are mounted electromagnetic contactors, step finder, relays and other elements of the electrical circuit. The power supply of the electric circuit is carried out from the power source of the welding arc. A low-resistance resistor serves as a remote control unit. This device works on the principle of operation of the step finder. The welder, the closure and the opening, a certain number of times by the electrode holder the welding circuit through the external resistor, causes the relay to set the x-ray finder to a certain position. In turn, the schagovy finder includes the corresponding contactor or a group of contactors, which close the ballast resistor circuit instead of knife switches. Thus, the required welding current value is established. The device remotely sets (adjusts) the welding current, but it does not provide visual remote monitoring from the welding site of the movement and position of the regulator (for example, the step finder) and the ability to check from the welding point that the welding current is set correctly. The purpose of the invention is to increase the accuracy of the installation of the welding current by providing a visual remote control of the correctness of the installation of the value of the welding current from the workplace. This goal is achieved due to the fact that in the device for remote setting of the welding current, containing the power source of the welding arc with a current regulator, an executive schagovy block with two contact fields and a normally open contact, and a control unit connected to the electrode holder, is inserted a recording unit containing a control coil and a test lamp, connected in parallel with each other through counter-activated diodes and a pointer, and connected to the electrode holder, and in the control unit The relays are introduced by a scroll relay and a power supply rectifier of the test lamp, while the electrode holder is simultaneously connected to a normally open contact and the first contact of the first contact field of the actuating stepper block. The introduction of the remote registering step block and the indicated interrelation with the executive step block, control unit and power source of the welding arc ensure, through the welding circuit, remote installation of the required welding current, visual control (registration of the current setting), and verification of the current setting (compliance of the positions between step-by-step executive and remote registering units). The drawing shows a device for remote setting of the welding current, electrical circuit. A device for remote setting of the welding current includes a welding arc power source 1, electrically connected to current regulator 2, an executive stepper block 3 consisting of contact fields 5 and 6, coil 4, normally open contact 7 and closed contact 8 , electrode holder 31, control unit 9, consisting of a current setting relay 10 with contacts And 12, a scheduling relay 13 with contact 14 (shutdown time delay 0.3-0.5 s), time relay 15 with contacts 16 and 7 (time delay for the inclusion of 0.1-0.15 s, on 1-2 c), contactor 18 with contact 19, current relay 20 with contact 21, control supply transformer 22, control circuit power supply rectifier 23, control lamp power supply rectifier 24, control lamp 28 resistors 33 and 34, diode 35, remote schagovy recording unit 25 with a coil 26, a pointer 27, a control lamp 28 and diodes 29 and 30, the input of the recording unit 25 is connected to the electrode holder 31, the output through the product 32 - to the welding arc power source 1, and the electrode holder 31 to the wire simultaneously connected to normally open contact 7 and The first contact of the first contact field 6 of the executive chuck unit 3. Thus, the control roll 26 and the control lamp 28 "reference point of the remote recording unit 25 has a direct electrical connection with the executive unit 3 through its normally open contact 7 and the first contact of the first contact field 6. Before welding or setting the required welding current, the transformer 22 is energized. This activates the time relay 15 and, by contact 16, breaks the power supply circuit of the relay coil 13 pitch movement, and contact 17 turns on contactor 18, which closes the welding circuit by contact 19. For normal operation of the remote recording unit 25, its response voltage was selected 1.3-1.5 times greater than the no-load voltage of the power source 1 of the welding arc. In connection with this, the recording unit 25 for welding voltage is not turned on. The installation of the required welding current at a distance is carried out as follows. The electrode holder 31 with the filled end of the electrode is closed to the input of the recording unit 25, and the output is connected through the product 32 to the source 1 of the welding arc. The relay 10 is turned on and the contact 11 breaks the power supply circuits of the time relay 15 and the contactor 18, and by the contact 12 prepares to switch on the relay 13 of the xyg displacement. Recording

the block 25 is not turned on, since the power supply of the coil 26 is low for actuation. The welding circuit is broken by pin 19 and does not affect the operation of the device. After a time delay, relay 15, contact 16 turns on a relay 13 relay, which uses contact 14 to supply power to coil 4 of a stepping actuator 3. Block 3 turns on and moves moving contacts of contact fields 5 and 6 by one step, automatically changing control parameters. torus 2 current by a certain amount. At the same time, the contact 7 of the executive unit 3 supplies power to the coil 26 of the remote step recording unit 25, which turns on and mixes the moving contact with the pointer 27 by one step. The contact 8 of the executive unit 3 opens the supply circuit of the coils of the relay 10, 13 and 15. After a time delay (0.3-0.5 s), the relay 13 by the contact 14 removes the voltage from the coil 4 of the executive unit 3. Last, disconnecting, breaks its contact 7 and closes contact 8. Relay 10 is turned on again. Relay 15 does not operate due to the presence of an on delay (0.1-0.15 s), and its circuit is broken by contact 11 during this time, i.e. contactor 18 remains in the off state. Contact 12 turns on the relay 13 for stepping movement and with its contact 14 applies voltage to the roller 4 of the execution unit 3. The device turns on and moves the moving contacts of the contact fields 5 and 6 to the 2nd step, then changing the parameters of the current regulator 2. The contact 7 of the block 3 switches on the registering block 25, which mixes the moving contact with the pointer 27 also on the 2nd step, etc., before removing the electrode holder 31 from the input of the register block 25. Thus, the required welding current values and visual remote monitoring of the current setting with automatic reading of its set value.

The check of the welding position according to the positions between the executive and remote recording units 3 and 25 (control of correct current setting) is carried out as follows.

When moving the moving contacts of the contact fields 5 and 6 of the executive unit 3 to the first contact, the control lamp 28 "reference point of the remote recording unit 25 is energized via the circuit: plus rectifier 24 - ground (product) - control lamp 28 - diode 30 - electrode holder 31 with wire - resistor 33 - first contact of the contact floor 6 - minus rectifier 24.

The ignition of the signal lamp 28, when the pointer 27 of the registering unit 25 is in the first position, means that the executive and remote registering units occupy unambiguous positions, and in the case of the signal lamp lights up in any other position of the pointer 27, they are ambiguous. In this case, the welder must remove the electrode holder 31 from the input of the block 25 and move the pointer 27 to the first position, i.e. in fact to the position in which the moving contacts of the fields 5 and 6 of the actuating unit 3 are located.

When the electrode holder 31 is removed from the input of the registering unit 25, the relay 10 is turned off and by the contact 11 turns on the relay 15, which by the contact 17 turns on the contactor 18 and the welding circuit by the contact 19 is prepared for welding. When welding is performed (excitation of the welding arc), the current relay 20 is turned on and, by its contact 21, breaks the power supply circuit of the coil of the current setting relay 10. Thus, the stepping actuator 3 during the welding process does not work.

Technical and economic indicators of the proposed device are higher than that of the known ones, since the accuracy of the welding current setting is improved and the working conditions of the welder at the distance settings of the required welding current values are greatly simplified, and visual remote control from the welding site at the set welding current value is provided.

In the event of a failure (failure) in the work of the executive or recording step blocks, the faults are fixed by the welder and are eliminated directly at the welding location.

This makes it possible to reduce the amount of rejection from the welding performance on the other than the required current value.

Claims (3)

1. Author's certificate of the USSR L 102494, cl. At 23 K 9/10, 09/28/58. 2. USSR author's certificate number 114605, cl. At 23 K 9/10, 14.05.59. 3. Technical sheet 54 UDC 621791037: 621 3.014 Leningrad CLTI, 1967 (prototype).