CN201300275Y - An idle-load automatic stop power saving device for ac welding machine - Google Patents

Abstract

The utility model discloses an AC welding machine no-load self-stop power-saving device, which can be widely used in construction sites, steel structure parts, steel product processing and other places. The power-saving device includes a main switch, an electric welding machine, welding tongs, and an AC relay. The power-saving device also includes a solid-state relay. The primary coil of the electric welding machine is connected in series with the output end of the solid-state relay on the live wire and neutral wire of the alternating current. end. The utility model provides the no-load self-stop power-saving device for the AC electric welding machine. When the electric welding machine is not welding, the power supply is automatically turned off, so that the electric welding machine has sufficient cooling time, prolonging the service life of the electric welding machine. As an energy-saving switch for electric welding machines, it replaces the closing and opening of mechanical switches. It has the advantages of no contact jumping, no mechanical noise, low radio frequency interference, no arcing on and off, fast switching speed and small size.

Description

AC welding machine no-load self-stop power-saving device

technical field

The utility model belongs to the technical field of production of power-saving devices, and in particular relates to a no-load self-stop power-saving device for an AC welding machine that saves energy and prolongs its own service life under the premise of satisfying all functions.

Background technique

AC welding machine is a widely used welding equipment, but because of its heavy weight, difficult to move and intermittent work, more than 50% of the time is in the state of no-load waiting for welding. The reactive power consumption is about 10-20% of the rated power when no-load is to be welded. Therefore, it is a simple and effective power-saving measure to use the no-load self-stop device of the electric welding machine. The existing AC welding machine self-stop power-saving device mainly The switching element is an AC contactor. When the AC contactor is turned on and off, it will generate noise, vibration, and contact sparks. It is easy to burn out the contacts under high current and shorten the service life.

Utility model content

The purpose of this utility model is to design a no-load self-stop power-saving device for an AC electric welding machine. When the electric welding machine is not welding, the power supply is automatically turned off, so that the electric welding machine has sufficient cooling time and can prolong the service life of the electric welding machine.

The utility model includes: a main switch, an electric welding machine, a welding tongs, and an AC relay, and is characterized in that: the power saving device also includes a solid state relay, and the primary coil of the electric welding machine is connected in series with the output end of the solid state relay on the live wire of the alternating current and neutral terminals.

One end of the secondary coil of the electric welding machine is connected with the welding tongs, one end is connected with the workpiece, and the other end of the workpiece is connected with the ground.

One end of the AC relay is connected to the live wire, and the other end of the AC relay is connected in series with the normally closed contact of the sensitive relay and the normally closed contact of the time relay in sequence, and finally connected to the neutral wire end.

The normally closed contact of the sensitive relay is connected in parallel with the normally open contact of the AC relay, and the time relay is connected between the welding tongs and the circuit ground, while the normally closed contact of the AC relay is connected in series with the coil of the sensitive relay, connected in Between the welding clamp and the circuit ground.

One end of the control end of the solid state relay is connected to the live wire, and the other end is connected to the neutral wire end through the normally open contact of the AC relay. The live wire and the neutral wire end are also connected to the primary coil of the auxiliary transformer, and the secondary coil of the transformer is The resistor is connected between the normally closed contact of the relay and the coil of the sensitive relay, while the other end is connected to the circuit ground.

The utility model has the following beneficial effects: the AC welding machine no-load self-stop power-saving device provided by the utility model has the following advantages:

1) When the welding machine is not welding, it will automatically turn off the power supply, so that the welding machine has enough cooling time, which prolongs the service life of the welding machine.

2) Use the on and off of the solid state relay as the energy-saving switch of the electric welding machine, instead of the closing and opening of the mechanical switch, with no contact jumping, no mechanical noise, low radio frequency interference, no arc generated by the switch machine, fast switching speed and Small size and other advantages.

3) The reactive power loss of the equipment itself is very small, and the cost of circuit components is low.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described. Fig. 1 is the structural representation of the utility model. The utility model comprises a main switch 1, an electric welding machine 2, a welding tongs 3, and an AC relay 4, and is characterized in that: the power saving device also includes a solid state relay 5, the primary coil of the electric welding machine 2 and the output end of the solid state relay 5 Connected in series between live and neutral terminals of AC.

One end of the secondary coil of the electric welding machine 2 is connected to the welding tongs 3 , one end is connected to the workpiece 6 , and the other end of the workpiece 6 is connected to the ground.

One end of the AC relay 4 is connected to the fire wire, and the other end of the AC relay 4 is connected in series with the normally closed contact of the sensitive relay 7 and the normally closed contact of the time relay 8 in sequence, and finally connected to the zero line end.

The normally closed contact of the sensitive relay 7 is connected in parallel with the normally open contact of the AC relay 4, and the time relay 8 is connected between the passage connected between the welding tongs 3 and the zero line and the ground, and the normally closed contact of the AC relay 4 is connected in parallel. Point is connected in series with the coil of sensitive relay 7.

One end of the control end of the solid state relay 5 is connected to the live wire, and one end is connected to the neutral wire end through the normally open contact of the AC relay 4, and the primary coil of the auxiliary transformer 10 is also connected to the live wire and the neutral wire end, and the secondary coil of the transformer One end of the coil is connected between the normally closed contact of the AC relay 4 and the coil of the sensitive relay 7 through a resistor, and the other end is connected to the circuit ground.

The working principle of the present utility model is realized below

1), start up (to be welded)

When the main switch 1 is closed, the auxiliary transformer 10 immediately senses the 12V voltage, so the sensitive relay 7 and the AC relay 4 are energized almost at the same time, but since the action time of the sensitive relay 7 is shorter than the action time of the AC relay 4, the sensitive relay 7 is first attracted and closed. Cut off the coil circuit of AC relay 4 so that it cannot be closed. The solid state relay 5 cannot be turned on without receiving the conduction signal, the primary coil of the electric welding machine 2 cannot be connected to the power supply, and the electric welding machine does not work. Even if the AC relay 4 pulls in first, the normally open contact turns on the solid state relay 5, and the primary side of the welding machine is powered on, but if there is no welding, the welding machine 2 will automatically shut off after a delay due to the action of the time relay 8. Open the coil circuit of the AC relay 4, so that the solid state relay 5 has no conduction signal, and the primary coil of the electric welding machine has no voltage, and the electric welding machine 2 is in a standby state at this time.

2), work (welding workpiece)

When welding is required, as long as the welding rod is touched with the workpiece, the sensitive relay 7 will lose power in an instant and its normally closed contact will be closed, the AC relay 4 will be energized, and the normally open contact of the AC relay 4 will be closed. The relay 5 is turned on, and the primary side of the electric welding machine 2 is energized, and enters the working state. Because the normally open contact of the AC relay 4 is closed and self-locking, the normally closed contact is disconnected: the sensitive relay 7 can still be powered to make the normally closed contact disconnected, and the normally open contact of the AC relay 4 still keeps pulling. When electric welding machine 2 is welding, its secondary voltage is generally less than or equal to 35V, which cannot meet the requirement of 60V pull-in voltage of time relay 8, SJ cannot operate, and the welding work continues normally.

3), stop welding (automatic control shutdown)

When the electrode leaves the workpiece and stops welding, the secondary voltage of the welding machine 2 immediately rises to 60V-80V, which is greater than the pull-in voltage of the time relay 8, and the time relay 8 pulls in for a certain period of time. Generally, the adjustment time is longer than that of normal welding. It takes a long time to change the welding rod, it is disconnected after about 10-30 seconds, and the coil circuit of the AC relay 4 is cut off. The solid state relay 5 has no conduction signal and is not conducting. At this time, the sensitive relay 7 has already been powered and it is normally closed in advance. The contact is disconnected, so the solid state relay 5 is not conducting, the electric welding machine 2 automatically cuts off the power supply, and the normally closed contact of the AC relay 4 is closed, waiting for the next work, so that the electric welding machine 2 completes a work cycle. When welding again, the circuit repeats the above process.

Claims (6)

1, a kind of A.C. welder no-load automatic stop battery saving arrangement, described battery saving arrangement comprises master switch (1), electric welding machine (2), soldering turret (3), AC relay (4), it is characterized in that: described battery saving arrangement also comprises solid-state relay (5), and the output series connection of the primary coil of described electric welding machine (2) and solid-state relay (5) is at the live wire and the zero line side of alternating current.

2, A.C. welder no-load automatic stop battery saving arrangement according to claim 1 is characterized in that: secondary coil one end of described electric welding machine (2) links to each other with soldering turret (3), and an end links to each other with workpiece (6), and the other end of described workpiece (6) then connects together with ground.

3, A.C. welder no-load automatic stop battery saving arrangement according to claim 1 and 2, it is characterized in that: an end of described AC relay (4) links to each other with live wire, the other end of described AC relay (4) is connected successively with the normally-closed contact of the normally-closed contact of sensitive relay (7), the time relay (8), is connected on zero line side at last.

4, A.C. welder no-load automatic stop battery saving arrangement according to claim 3, it is characterized in that: the normally-closed contact of described sensitive relay (7) is in parallel with the normally opened contact of AC relay (4), is connected the described time relay (8) between path that soldering turret (3) connects and ground, the normally-closed contact of while relay (4) is connected with the coil of sensitive relay (7).

5, A.C. welder no-load automatic stop battery saving arrangement according to claim 1 and 2, it is characterized in that: control end one end of described solid-state relay (5) links to each other with live wire, one end is connected zero line side by the normally opened contact of AC relay (4), also be connected with the primary coil of auxiliary transformer (10) at live wire and zero line side, and secondary coil one end of transformer is connected between the coil of the normally-closed contact of relay (4) and sensitive relay (7) by resistor, and the other end then links to each other with circuit ground.

6, A.C. welder no-load automatic stop battery saving arrangement according to claim 3, it is characterized in that: control end one end of described solid-state relay (5) links to each other with live wire, one end is connected zero line side by the normally opened contact of AC relay (4), also be connected with the primary coil of auxiliary transformer (10) at live wire and zero line side, and secondary coil one end of transformer is connected between the coil of the normally-closed contact of relay (4) and sensitive relay (7) by resistor, and the other end then links to each other with circuit ground.

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