JPH0347736Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an automatic profile welding device for accurately and efficiently welding a large number of workpieces.

<Conventional technology> Conventionally, in order to accurately weld and mass-produce workpieces of a fixed shape, it has been necessary to move the welding machine on a rail along a straight joint, or to rotate the cylindrical base material while the welding machine is fixed. The conventional method is to assemble the workpieces into a jig and rotate the positioner at an angle for automatic welding. However, if the welded part is not simply straight or circular, but has a complex shape that is a combination of these, it is difficult to use the above-mentioned welding method as is. In addition, electric, electric contact, electro-hydraulic, or pneumatic automatic tracing devices are used to perform cutting automatically, and the cutting tool is controlled by a driven part that moves along the shape plate or model. It is now possible to control the feed. However, it is practically difficult to guide the welding machine by bringing the driven part into direct contact with the welding part of the workpiece. Furthermore,
Welding robots and the like that are controlled by a computer according to a program input in advance have been put into practical use, but they are extremely complex and expensive.

<Problems to be solved by the invention> The purpose of the invention is to provide an automatic profile welding device that is relatively inexpensive and has a simple structure for automatically welding a large number of workpieces accurately and efficiently. .

<Means for Solving the Problems> According to the present invention, the above-mentioned object has a workbench for assembling a workpiece, an outer shape corresponding to the shape of the workpiece, and an integral part of the workbench. a driven gear connected to the driven gear, a guide plate having a cam groove in which a cam follower provided on the driven gear engages to guide the driven gear along a predetermined trajectory, and a driving gear that meshes with the driven gear. Equipped with
This is achieved by providing an automatic profile welding apparatus characterized in that the work table moves integrally with the driven gear that moves along the trajectory by rotating the drive gear.

<Operation> In this way, the workpiece on the workbench moves integrally with the driven gear guided on a predetermined trajectory by the driving gear, and is automatically moved by the tool fixed at a fixed position. It will be welded to. Moreover, since the movement locus of the driven gear is defined by the cam follower provided on the driven gear and the cam groove provided on the guide plate, the movement stability of the workpiece is improved.

<Embodiments> The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the output shaft 2 of the motor unit 1 containing the electric motor has the following features:
A gear shaft 4 is connected by bolting the flanges 3a and 3b together. A normal gear 5 is fixed to the gear shaft 4 by a set screw 6 as shown in FIG.

An L-shaped member 7 is provided on one side of the motor unit 1.
is attached by bolts 7a, and a guide plate 8 is fixed thereon by bolts 8a. The gear shaft 4 is mounted on the upper surface of the guide plate 8.
A gear shaft 10 for a track gear 9 that meshes with the normal gear 5 is erected on the side adjacent to the normal gear 5, and a guide 11 consisting of a groove with a circular cross section is provided. The guide 11 has two sizes, one large and one small, centered around the gear shaft 10.
semicircular parts 11a, 11b and two connecting them.
It consists of straight line parts 11c and 11d.

The track gear 9 has a so-called oval shape having a semicircular part and a straight part corresponding to the shape of the welded part of the workpiece, which will be described later, and extends from the center of one semicircle to the center of the other semicircle along the longitudinal direction. It is provided with an elongated shaft hole 12 extending up to . The track gear 9 also has four screw holes 13a to 13d and four round holes 14a to 14d at symmetrical positions along the longitudinal direction and the perpendicular direction thereof.
4d are drilled in each case.

Orbit plungers 15a and 15b as cam followers are screwed into the screw holes 13a and 13b, and auxiliary plungers 15c and 15d are screwed into the screw holes 13c and 13d, respectively. Steel balls 16a to 16d, which partially protrude from their lower ends, are fitted into each of the plungers 15a to 15d so as to be freely rotatable. The steel balls 16a, 16b protruding from the lower ends of the orbital plungers 15a, 15b are disposed in the grooves of the guide 11 serving as cam grooves, and the steel balls 16c, 16d protruding from the lower ends of the orbital plungers 15c, 15d are arranged on the upper surface of the plate 8. so that the track gear 9 can move stably and smoothly on the plate 8 while being guided by the guide 11.
Each plunger 15a to 15d has a nut 1
It is adjusted to a predetermined height by 7a to 17d.
In this way, the track gear 9 has the gear shaft 11 inserted into the shaft hole 12, and the bolt 18 and washer 1.
9, it is held on the guide plate 8 while being prevented from coming off.

A work stand 20 is arranged above the truck gear 9. The work stand 20 has four pillars 2
Consisting of two plates 22 and 23 connected vertically in parallel by 1, the tips of four legs 24a to 24d extending downward from the lower plate 23 are inserted into corresponding round holes 14a to 14d, respectively. It is inserted and integrally supported on the track gear 9. The upper plate 22 is provided with an oval hole 25 opening on one side thereof and three protrusions 26 around the hole 25.

In this embodiment, an oval-shaped flange member 27 and a corresponding cylindrical member 28 are used as objects to be welded. Upper plate 22 of work stand 20
On the top, a flange member 27 is positioned by fitting the protrusion 26 into a through hole 29 provided along its periphery, and in combination therewith, a cylindrical member 28 is accurately placed in a predetermined position. Ru.

Further, an L-shaped member 30 is attached to the other side of the motor unit 1 with bolts 30a.
A torch stand 31 is fixed to the top thereof. A welding torch 32 is fixed to the tip of the torch stand 31 so as to face the weld between the flange member 27 and the cylindrical member 28 .

The operating procedure of the automatic tracing device of this embodiment will be explained below.

As shown in FIG. 4, in the track gear 9, the gear shaft 10 is located at one end of the shaft hole 12, and each track plunger 15a, 15b is connected to two large and small semicircular parts 11a, 11b of the guide 11, respectively. at central positions A and D. When the electric motor built into the motor unit 1 is driven to rotate the normal gear 5 counterclockwise in the direction of the arrow 33 in the figure,
Truck gear 9 is normal gear 5 in its semicircular part.
Since it meshes with the gear shaft 10, it rotates clockwise in the direction of the arrow 34 in the figure, centering on the gear shaft 10. Therefore, the orbital plunger 15a moves from position A to position B, and the orbital plunger 15b moves from position D to position E, respectively, to the position shown in FIG.

When the normal gear 5 further rotates from the position shown in FIG.
15b moves along linear portions 11c and 11d from position B to position C, from position E to position F, and linearly moves to the position shown in FIG. 6. At this time, the gear shaft 10 relatively moves from the one end of the shaft hole 12 to the other end. When the normal gear 5 is further rotated, the track gear 9 rotates around the gear shaft 10, and the track plunger 1
5a and 15b move through semicircular parts 11a and 11b, respectively, from position C to position D, and from position F to position A.
Move to. By driving the normal gear 5 at a constant speed in this way, the truck gear 9
is restrained by the guide 11 and repeats constant rotational motion and linear motion to rotate once at a constant speed.

The flange member 27 and the cylindrical member 28 similarly perform rotational motion and linear motion at a constant speed in response to the rotation of the normal gear 5 and the track gear 9. Since the welding torch 32 is always fixed at a fixed position, it rotates around its outer periphery once at a relatively constant speed while maintaining a fixed distance between it and the welded parts of the assembled members 27 and 28. Therefore, the flange member 27 and the cylindrical member 28 can be accurately welded at a constant speed while the welding torch 32 remains fixed.

Note that the present invention is not limited to the above-described embodiments, and can be implemented with various modifications and changes. For example, by configuring the normal gear with an eccentric gear or a non-circular gear, the present invention can be applied to workpieces having various outer peripheral shapes. In this case, the guide is formed appropriately in accordance with the outer peripheral shape of the workpiece, the movement of the driven gear, etc. Furthermore, the automatic tracing device according to the present invention can be used to perform various types of processing along the outer periphery of a workpiece. for example,
A cutting machine can be placed in place of a welding torch to perform automatic cutting, and cutting tools and other various tools can be fixed to process workpieces.

<Effect of the invention> As described above, according to the invention, a track gear consisting of a semicircular part and a straight part corresponding to the outer periphery of the welding part of the workpiece is meshed with a normal gear, and the track gear is fixedly aligned along a predetermined guide. By driving at speed, welds can be automatically and precisely welded at a constant speed with a fixed welding torch. Furthermore, even if the outer periphery of the workpiece has various shapes other than a simple circle or a straight line, a large quantity of products can be welded at a relatively low cost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an automatic tracing device according to the present invention. FIG. 2 is a front view of an automatic welding machine using the automatic tracing device according to the present invention. Third
The figure is an enlarged sectional view of the main part. FIGS. 4 to 7 are explanatory diagrams showing the operations of the track gear and the normal gear. 1...Motor unit, 2...Output shaft, 3a,
3b...Flange, 4...Gear shaft, 5...Normal gear, 6...Set screw, 7...L-shaped member, 7a
...Bolt, 8...Guide plate, 8a...Bolt, 9...Truck gear, 10...Gear shaft, 1
1...Guide, 11a, 11b...Semicircular part, 11
c, 11d...Straight portion, 12...Shaft hole, 13a~
13d...Screw hole, 14a-14d...Round hole, 1
5a, 15b...orbital plunger, 15c, 15
d... Auxiliary plunger, 16a-16d... Steel ball, 17a-17d... Nut, 18... Bolt, 19... Washer, 20... Work stand, 21... Support column, 22... Upper plate, 23
...Lower plate, 24-24d...Leg, 25...
... hole, 26 ... protrusion, 27 ... flange member, 2
8... Cylindrical member, 29... Through hole, 30... L-shaped member, 30a... Bolt, 31... Torch stand, 32... Welding torch, 33, 34... Arrow.

Claims (1)

[Claims for Utility Model Registration] A workbench for assembling a workpiece; a driven gear having an outer shape corresponding to the shape of the workpiece and integrally connected to the workbench; a guide plate having a cam groove that engages with a cam follower provided on the driven gear to guide the driven gear along a trajectory; and a drive gear that meshes with the driven gear, the work table rotates the drive gear. An automatic profile welding device characterized in that the automatic profile welding device moves integrally with the driven gear that moves along the trajectory.