JP3517809B2 - Pulse heat welding power supply - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse heat welding power source for welding by supplying a pulsed welding current to a heater chip.

[0002]

2. Description of the Related Art Conventionally, as a pulse heat welding power source 1 for welding by supplying a pulsed welding current to a heater tip, as shown in FIG. It descends along the shaft 52, and the heater chip 50 is pressed against the work. Then,
A pulse welding current is supplied from the pulse heat welding power source to heat the heater chip 50. Heater chip 5
When 0 is heated to the specified temperature, the work is welded. When the welding is completed, the heater chip 50 is naturally cooled, and when the temperature reaches the solidification point (solid point) temperature of the solder or lower, the welding head 51 rises. The heater chip 50 is further naturally cooled by the heat sink 53.

However, in the natural cooling of the heater chip 50 by the heat sink 53, it takes a long time for the heat sink 50 to cool down to a specified temperature, resulting in poor work efficiency. In particular, in the case of automatically supplying a work by supplying a work at a constant time interval, the shorter the work supply time is, the more the heater chip 50 and the heat sink 53 cannot cool down to a specified temperature by natural cooling. . Therefore, in some cases, the sequence control is performed such that when the welding is completed, the heater chip 50 and the heat sink 53 are respectively blown with air to forcibly cool them.

Further, along with the air blowing operation, the elevation of the welding head 51 is similarly sequence-controlled.
Further, the lifting and lowering of the welding head 51 by the air cylinder and the blowing of air for cooling the heat sink 53 and the heater chip 50 are all performed by driving the solenoid valve.
The driving operation of these solenoid valves is sequence-controlled by a timing signal from an external sequence control unit.

[0005]

However, in the pulse heat welding power source, only the power source for heating the heater chip and the power source for the circuit operation are mounted, and the drive circuit of the solenoid valve for raising and lowering the welding head and the air source. The drive circuit of the solenoid valve for spraying is mounted on another unit, and each solenoid valve is controlled by an external sequence control unit. Therefore, there is a problem that the extra unit is required, and the cost of the welding apparatus system is increased. Therefore, a method of controlling each solenoid valve in sequence by a timing signal of a timing circuit built in the pulse heat welding power source without using an external sequence control unit has been studied.

[0006]

According to the present invention, there is provided a pulse heat welding power source having a timing circuit, wherein a pulse-shaped welding current is supplied to a heater chip having a heat sink to perform welding by a timing signal of the timing circuit. ， The pulse heat welding power source controls the solenoid valve drive circuit for the cylinder that drives and stops the air cylinder that moves up and down the welding head with the heater chip attached, and controls the supply and stop of the air that cools the heater chip. The drive circuit of the solenoid valve for the heater chip and the drive circuit of the solenoid valve for the heat sink that controls the supply / stop of air for cooling the heat sink are added, and each drive circuit converts AC to DC. Full-wave rectification and smoothing circuit for rectifying to, a power supply control IC connected to this full-wave rectification and smoothing circuit, and this power supply Constituted by a switch circuit connected in series to the control IC, Moreover, the switch circuit is obtained so as to drive the solenoid valve each controlled by a timing signal from the timing circuit.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIGS.
It will be described in detail based on. FIG. 1 shows an embodiment of the present invention. A circuit diagram of a pulse heat welding power source including a drive circuit of a solenoid valve 8, FIG. 2 is a configuration diagram of essential parts, and FIG. FIG. 4 is a time chart diagram showing the configuration of cooling. The same parts as those in the conventional example are designated by the same names and the same reference numerals, and the description thereof will be omitted.

In FIG. 1, reference numeral 1 is a terminal plate of a main power supply, the primary side of a transformer (not shown) is connected to a commercial AC power supply (not shown), and the secondary side is connected to a terminal plate. Reference numeral 2 is a full-wave rectification and smoothing circuit, and the AC voltage on the secondary side of the transformer is rectified by the full-wave rectification circuits 2a and 2b, then smoothed by a capacitor and converted into a DC voltage containing ripples. The DC voltage including this ripple is converted into a desired DC voltage by the power supply control IC 3 (3a, 3b) and output.

Reference numeral 4 (4a, 4b, 4c ...) is a switch circuit, which is connected in series to the power supply control IC 3. In this embodiment, a normal transistor switch circuit is used, but a switch such as a relay is used. Circuitry may be used.
5 (5a, 5b, 5c ...) Is an isolation circuit, and the built-in timing signal is used for the signal input terminal 6
Input in (6a, 6b, 6c ...). The timing signal is the photocoupler 7 of the isolation circuit 5.
(7a, 7b, 7c ...) is transmitted by optical coupling,
The switch circuit 4 (4a, 4b, 4c ...) is configured to be input to each of them, and the signals of the signal system and the control system are insulated.

The drive circuit of each solenoid valve 8 (8a, 8b, 8c ...) is composed of a full-wave rectification and smoothing circuit 2, a power supply control IC 3, an isolation circuit 5 (5a, 5b, 5c).
..), switch circuit 4 (4a, 4b, 4c ...
・), And these drive circuits are sequence-controlled by the built-in timing signals.

Reference numeral 9 is an OR circuit, which is connected to the signal input terminal 6 of the timing signal and determines whether the external sequence unit 10 controls the drive circuit of the solenoid valve 8 in sequence or in the apparatus. 9
It is configured to be selectable with. In the circuit diagram of FIG. 1, the OR circuit 9 is described to be connected only to the drive circuit of the solenoid valve 8d, but the other solenoid valves 8a, 8b, 8c ... The description is omitted, and the other solenoid valves 8a, 8b, 8c.
Similarly, the external sequence control unit 10 is connected to. Reference numeral 11 is an output terminal board.

FIG. 2 is a block diagram of the main part of the welding apparatus. Reference numeral 12 is a pulse heat power source main body, which is provided with a control section / operation section. The conditions such as the setting of the heating time, the heating temperature of the heater chip, and the setting of the air supply amount for bringing the heater chip to a predetermined cooling temperature are initialized. Thirteen
Is a pulse heat welding transformer. Solenoid valves 8a, 8b
Are opened and closed by a drive signal from the pulse heat welding transformer 13.

FIG. 3 shows the welding head up and down and the heater chip 5.
0 and the heat sink 53 cooling configuration diagram, 1
Reference numeral 6 (16a, 16b, 16c, 16d) is an air pressure adjuster, which adjusts the air pressure when the welding head 51 moves up and down, and adjusts the air blowing pressure when the heater chip 50 and the heat sink 53 cool. It is carried out. In this embodiment, as shown in FIG. 3, the heater chip 50 and the heat sink 53 have the same air blowing pressure.

Next, the action and operation will be described with reference to FIGS. First, according to the initial conditions, when the work is supplied at the time T1, the pulse heat power source main body 12 issues a command to move the welding head 51 downward at the time T2.
It is emitted to c and the air is supplied and the welding head 51 starts descending.

When the welding head 51 starts descending and the heater chip 50 is brought into pressure contact with the work, a heating current flows through the heater chip 50 at time T3 to start heating. The heating state of the heater chip 50 at this time is shown as a heating temperature curve in FIG. The heater chip 5
0 is formed of molybdenum, tungsten, or the like.

When the welding of the work is completed, the welding head 5
The feedback signal from 1 is the pulse heat power supply main body 12
At time T4, the solenoid valve 8a for the heater chip 50 and the heat sink is driven by the drive circuit 4, respectively, and the solenoid valve 8a for cooling is opened so that the cooling air is supplied to the heater chip 50 and the tube of the heat sink 53. 5
Air is blown onto the heater chip 50 and the heat sink 53 by 4, 4 ', respectively, to cool them. When the heater chip 50 is cooled to the solid point of the solder, the drive circuit of the solenoid valve 8 is turned off at time T5 to stop the air blow, and then the welding head 51 is raised to complete one cycle.

Next, at time T6, the next work is supplied and the work is welded by the sequence control similar to the above.

[0018]

The present invention provides a pulse heat welding power source,
The drive circuit of the solenoid valve for the cylinder that drives and stops the air cylinder that moves up and down the welding head with the heater chip attached, and the solenoid valve for the heater chip that controls the supply and stop of the air that cools the heater chip. A drive circuit and a drive circuit for a heat sink solenoid valve that controls the supply and stop of air for cooling the heat sink are added, and each drive circuit eventually rectifies an alternating current into a full wave rectification and smoothing circuit. And a power supply control IC connected to the full-wave rectification and smoothing circuit and a switch circuit connected in series to the power supply control IC. Further, the switch circuit is controlled by a timing signal from the timing circuit. Since each solenoid valve is driven, the timing signal of the pulse heat welding power source can be used for sequence control. Since that, the price of as a system of welding equipment will be cheaper. Moreover, there is no need to use an independent sequence control unit as in the conventional case, and the price is reduced accordingly.

Further, according to the present invention, since the OR circuit for selecting either the external sequence control circuit or the sequence control by the timing signal of the timing circuit is connected to the switch circuit, the external sequence control unit is also provided for the sequence control. Can be used.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention and is a main part configuration diagram of a welding device.

FIG. 3 shows an embodiment of the present invention and is a configuration diagram relating to elevation of a welding head, cooling of a heater chip and a heat sink.

FIG. 4 is a time chart of sequence control, showing an embodiment of the present invention.

FIG. 5 is a front view of the welding device.

[Explanation of symbols]

1 Main power terminal board 2 Full wave rectification and smoothing circuit 3 Power control IC 4 switch circuit 8 solenoid valve 9 OR circuit 10 External sequence control unit 12 pulse heat welding power source 13 pulse heat welding transformer 51 welding head 50 heater chips 53 heat sink

Claims (2)

(57) [Claims] 1. A pulse heat welding power source having a timing circuit, wherein a pulsed welding current is supplied to a heater chip having a heat sink by the timing signal of the timing circuit to perform welding. A drive circuit of a solenoid valve for a cylinder that drives and stops an air cylinder for moving up and down a welding head to which the heater chip is attached, and a solenoid for a heater chip that controls supply and stop of air for cooling the heater chip. A drive circuit for the valve and a drive circuit for a solenoid valve for the heat sink that controls the supply / stop of air for cooling the heat sink are added, and each of the drive circuits described above rectifies AC into DC. A wave rectification and smoothing circuit, a power supply control IC connected to this full wave rectification and smoothing circuit, and a direct connection to this power supply control IC. A pulse heat welding power source characterized by comprising a switch circuit connected in series, and further controlling the switch circuit by a timing signal from the timing circuit to drive each of the solenoid valves. 2. The pulse heat according to claim 1, wherein an OR circuit for selecting either an external sequence control circuit or a sequence control by a timing signal of the timing circuit is connected to the switch circuit. Welding power supply.