JP2903146B2 - Magnetic shielding device for parts supply pipe in electric resistance welding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of normally operating a component feeder combined with an electric resistance welding machine such as projection welding or spot welding, and more particularly to a component of the component feeder. It belongs to the field of eliminating magnetic effects on supply pipes.

[0002]

2. Description of the Related Art FIGS. 1, 3 and 4 show an embodiment of the present invention. The prior art will be described with reference to the drawings. The electric resistance welding machine 1 in this embodiment performs projection welding. An air cylinder 3 is fixed to the main body 2, a current-carrying base member 5 is connected to the piston rod 4, and a movable electrode 6 is fixed to the air cylinder 3. Also, the stationary base member 7 on the stationary side is fixed to the main body 2, and a fixed electrode 8 is attached to the stationary base member 7. Both electrodes 6, 8 are arranged on the same axis. Electric wires 9 and 10 for welding current are connected to the current-carrying base members 5 and 7 in a state where they are exposed to the outside as shown in the figure.
Is connected to the earth side. The above welding machines are very commonly used.

[0003] A component supply device 11 combined with the electric resistance welding machine 1 will be described. The target component here is the iron projection bolt 12 shown in FIG. 3, which is composed of a shaft portion 13, a flange 14, and a welding projection 15 formed on the lower surface of the flange 14. . A component holding member 18 is fixed to a piston rod 17 of an air cylinder 16 disposed in a horizontal direction, and the air cylinder 16 is supported by a pair of air cylinders 19 and 20 so as to be able to move up and down. The air cylinder 16 is fixed to upper ends of the piston rods 21 and 22. Reference numeral 23 denotes the air cylinders 19, 2
0 and a stationary member to which a support 24 described later is firmly fixed, such as a base supporting the component supply device 11.

A bracket 25 is welded to the column 24, and a metal end tube 26 is attached to the end of the bracket 25. A component supply pipe 27 made of a flexible synthetic resin such as vinyl chloride or polypropylene is inserted into the end pipe 26 as shown in FIG. This part supply pipe 2
Reference numeral 7 extends from a parts feeder (not shown). When the air cylinder 16 is most retracted, the relative position between the two is set so that the holding member 18 is located directly below the end pipe 26, and the holding member 18 has a slit groove 28 for receiving the shaft portion 13. Formed, which is open on the left side, as is evident from FIGS.

[0005] The component supply pipe 27 is arranged near the electric wire 9. As will be described later in the section of the problem, the vicinity of the electric wire 9 means that the electric wire 9 is within the range of the magnetic field generated around the electric wire 9 when the electric wire 9 is energized. FIG. 3 shows a steel plate 29 as a counterpart on the fixed electrode 8.
Is placed, and a receiving hole 30 of the shaft portion 13 is formed in the center of the fixed electrode 8, and the through hole 3 formed in the steel plate 29 is formed.
1 and the receiving hole 30 are matched.

The operation of the prior art described above will be described. The bolt 12 that has passed through the component supply pipe 27 enters the slit 28 of the holding member 18 where the shaft portion 13 stands by, and the state shown in FIG. Is held. Then, the holding member 18 advances to the left by the operation of the air cylinder 16, and the shaft 13
This advancing stops at a point where is coaxial with the through hole 31. Then, when the entire air cylinder 16 is lowered by the operation of the air cylinders 19 and 20, a part of the shaft portion 13 enters the through hole 31 and the receiving hole 30, and the holding member 18 is retreated from that state. The bolt 12 remains at that position and falls into the receiving hole 30 to completely enter, so that the holding member 18 prepares for the next arrival of the bolt 12. Thereafter, when the movable electrode 6 is lowered by the operation of the air cylinder 3 and a welding current is further applied to the electric wire 9, the projection 15 is welded to the steel plate 29 and welding is completed.

[0007]

In the prior art described above, since the component supply pipe 27 made of a non-magnetic material and the electric wire 9 are close to each other, the time when the electric power is supplied to the electric wire 9 is not obtained. When the time when the bolt 12 passes through the inside of the component supply pipe 27 near the electric wire 9 matches, the bolt 12
Is inserted into the magnetic field of the electric wire 9, the bolt 12 is attracted to the inner surface of the component supply pipe 27 on the electric wire 9 side. Therefore, the moving speed of the bolt 12 decreases, and the bolt 12
Is delayed in time to be transferred onto the holding member 18 and does not match the operation cycle of the component supply device 11, and a normal operation cycle cannot be obtained in the component supply device or the electric resistance welding machine. It becomes. Further, when the bolt 12 is extremely strongly sucked into the inner surface of the component supply pipe 27, the bolt 12 temporarily stops there,
As described above, there is a problem that a normal operation cycle is hindered. Further, the inner surface of the component supply pipe 27 is
There is a problem that abnormal wear is caused by strong rubbing of No. 2.

[0008]

Means for Solving the Problems and Their Functions The present invention has been provided to solve the above-mentioned problems.
The electric resistance welding machine in which the electric wire for welding current is exposed to the outside is provided with a component supply device having a component supply tube made of a non-magnetic material. at a site is located in the vicinity of the magnetic
Cover the part supply tube with a magnetic shielding member made of material,
The magnetic shielding member is shaped to cover the wire side of the component supply pipe.
It characterized in that there, the magnetic field in energization generated around the wire, to pass magnetic <br/> gas shielding member which the magnetic field lines covers the parts feed pipe, the component supply pipe parts Therefore, no suction force is generated for the parts. Claim 2 is an electric wire for welding current.
Made of non-magnetic material for the electric resistance welding machine exposed to the outside
A component supply device with an installed component supply pipe is installed.
The parts supply pipe is located near the electric wire.
Between the electric wire and the component supply pipe with a magnetic material
The made magnetic shielding member is arranged, and the magnetic shielding member
Is a pipe made of a magnetic material wire in a coil shape.
It is characterized in that the component supply pipe is passed through it , and by installing the component supply pipe in such a pipe, the magnetic field lines that are going to affect the component are completely shielded It is.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the illustrated embodiments. 1, 3, and 4
Although these figures are examples of the present invention, these drawings are diverted to the description of the prior art, and since most of the configurations and operations have been described as described above, only the magnetic shielding means is described here. I will explain. Prop 24
When viewed from the right side of FIG. 1, it has a gate-like shape and has a form just like straddling the air cylinder 16. As is clear from the cross-sectional view of FIG. 2, the magnetic shielding member 32 is a long member having a U-shaped cross section, and is made of a magnetic steel plate material. This member 32 includes brackets 33, 3
3 and is firmly fixed (for example, welded) to the upper part of the support post 24. A part supply pipe 27 is provided inside this U-shape.
Are provided, and a magnetic shield in the vicinity of the electric wire 9 is provided. In the case of FIG. 5, the magnetic shielding member 32 is
It has a character-shaped cross section. In the case of FIG.
Reference numeral 2 denotes an arc-shaped cross section. FIG. 7 shows an example in which a pipe made of a magnetic material wire is formed in a coil shape, and a component supply pipe 27 is passed through the inside of the pipe. The wire 35 is made of iron, and is provided with an aluminum covering 36 around the wire 35.
As is clear from FIG. 8, the pipe 34 is
Can be flexibly deformed by adapting to the flexion of. Although not shown, by attaching a rubber coating to the inside of the pipe 34, it is possible to increase the strength of the pipe.

In the above embodiment, the illustration of the air hose to be connected to the air cylinder is omitted. The electromagnetic air control valve for operating the entire apparatus shown in FIG. 1 and the electric control circuit therefor can be easily implemented by ordinary control equipment, so that the description thereof is omitted.

[0011]

According to the present invention, in a combination of an electric resistance welding machine in which an electric wire for welding current is exposed to the outside and a component supply device having a component supply pipe, a component located in the vicinity of the electric wire. Since a magnetic shielding member is installed between the supply pipe and the electric wire, it blocks the components in the component supply pipe from the magnetic field generated around the electric wire when energized, that is, the magnetic lines of force generated around the electric wire are magnetic substances. The magnetic field lines do not reach the components because they pass through the created magnetic shielding member.
Therefore, it is possible to reliably avoid the abnormal phenomenon of the operation cycle and the abnormal wear of the component supply pipe described in the above-mentioned problem section. Furthermore, even if an attempt is made to optimize the relative position between the electric resistance welding machine and the component supply device, this optimization cannot be realized because the component supply pipe is located in the vicinity of the electric wire. According to the present invention, such a disadvantageous method is completely avoided, and the relative position of the two devices can be easily optimized. Is possible.
The component supply pipe is required to have a piping posture that is most suitable for the movement of the components. However, in the present invention, since the magnetic influence from the electric wire can be avoided, the optimal piping that focuses on the component transfer is required. Posture is realized. As shown in FIG. 2, FIG. 5, and FIG. 6, the magnetic shielding member is installed so as to cover the component supply pipe on the electric wire side, so that it is possible to reliably shield the magnetic field lines from the electric wire. . Furthermore, since the magnetic shielding member is formed by winding a wire made of a magnetic material in a coil shape to form a pipe and passing the component supply pipe therein, even when the component supply pipe is extremely close to the electric wire, It can completely shield the magnetic field, and even if it is magnetically affected from the left and right of the parts supply pipe,
By using a pipe, adverse effects on components can be reliably prevented. Further, since the structure of the pipe is as described above, the pipe can be freely adjusted to the curved shape of the component supply pipe, which is convenient in the work of installing the component supply pipe. As an important effect, pipes are very advantageous in terms of space because the occupied space is minimized.

[Brief description of the drawings]

FIG. 1 is an external side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a vertical sectional side view showing a positional relationship between a component supply device and a fixed electrode.

FIG. 4 is a plan view of a holding member.

FIG. 5 is a cross-sectional plan view of another embodiment.

FIG. 6 is a cross-sectional plan view of another embodiment.

FIG. 7 is a cross-sectional plan view of another embodiment.

FIG. 8 is a side view of a partially broken pipe.

[Explanation of symbols]

 9 Electric wire 1 Electric resistance welding machine 27 Parts supply pipe 11 Parts supply device 32, 34 Magnetic shielding member 35 Wire rod 34 Pipe

Claims (2)

(57) [Claims] An electric resistance welding machine in which an electric wire for welding current is exposed to the outside is provided with a component supply device having a component supply tube made of a non-magnetic material. at a site is located in the vicinity of, magnetic
Cover the parts supply pipe with a magnetic shielding member made of conductive material,
The magnetic shielding member is shaped to cover the electric wire side of the component supply pipe.
The magnetic shielding apparatus of the component supply pipe in the electric resistance welding machine, characterized in that is. 2. An electric wire for welding current is exposed to the outside.
The electric resistance welding machine has a part supply pipe made of non-magnetic material.
Component supply device is installed,
At the location where the supply pipe is located near the wire,
Magnetic shield made of magnetic material between wires and supply pipe
Material is placed, and the magnetic shielding member is a wire made of magnetic material
Is formed into a coil-shaped pipe, inside which
A magnetic shielding device for a component supply pipe in an electric resistance welding machine, wherein the component supply pipe is passed therethrough.