JPS5847313B2 - Workpiece attachment/detachment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a workpiece attachment/detachment device, which is used to load a cylindrical workpiece into the horn of a welding device, such as when flash butt welding a rim, that is, a workpiece, in an automobile wheel rim manufacturing line. The purpose of this is to streamline the work when evacuating or withdrawing.

In the above-mentioned rim manufacturing line, a loading device was generally used as a means to attach and detach the workpiece to the horn of the welding device. If there is little clearance between the workpiece and the horn, the workpiece tends to come into contact with the horn, which often causes the workpiece suspended from the loading device to fall unexpectedly or to not be able to be smoothly attached to and removed from the horn. ,
Furthermore, in the case of the conventional loading device, the workpiece removed from the horn is placed in a direction perpendicular to the line, resulting in various problems such as the need to correct the workpiece again in the flow direction of the line.

The present invention has been devised as a result of various researches in order to solve this problem.Specifically, the present invention has been devised as a result of various researches to solve this problem. A boom having a sprocket, an auxiliary boom swingably held by the boom via a connecting rod, a spring that always biases the auxiliary boom toward the support, and a spring that is integrally supported by the auxiliary boom, and whose upper end is A sleeve protrudes above the boom, an arm shaft rotatably inserted into the sleeve and having a chucking arm attached to its lower end and a free sprocket attached to its upper end, the sprocket and A chain stretched between the free sprockets, a tension bar that applies tension to the chain, a guide roller provided at the end of the auxiliary boom near the support, and an integral part on the support side corresponding to the guide roller. The present invention relates to a device for attaching and removing a cylindrical workpiece, which comprises an attached deformed cam plate, and the deformed cam plate has a low step portion, a tapered portion following the low step portion, and a high step portion.

In the following, the present invention will be described according to an illustrated embodiment. Reference numeral 1 indicates a column, 9 a boom, and 21 a chucking arm. A fixed shaft 2 extends above the column 1, and a deformable cam A plate 3 is integrally provided.

As shown in FIG. 3, this deformed cam plate 3 has the fixed shaft 2 as its axis, and its outer peripheral portion is constituted by a low step portion 3a, a tapered portion 3b1, and a high step portion 3c.

Reference numeral 4 denotes a rotating support column rotatably fitted to the fixed shaft 2;
Furthermore, it is integrated with boom 9.

Reference numeral 5 denotes a hinge provided integrally with the rotating support 4, and a shaft 6
The boom 9 is connected to a rod 7 with the boom 9 as a fulcrum, and the boom 9 can be rotated within a range of about 90 degrees by the action of a cylinder 8.

A tension bar 11 that can rotate arbitrarily about a shaft 10 is attached to the substantially central portion of the upper surface of the boom 9, and idler sprockets 11a and 11b are rotatably attached to both ends of the tension bar 11, respectively.

12 is a fixed sprocket mounted on the fixed shaft 2;
13 is a free sprocket attached to the upper end of an arm shaft 15 attached to the tip of the boom, and a chain is connected between the fixed sprocket 12 and the free sprocket 13 via a tension bar 11 having idler sprockets 11a and 11b. 14 are installed.

In FIG. 2, reference numerals S and S2 indicate contracting springs, which constantly bias the tension bar 11 clockwise, thereby applying appropriate tension to the chain 14.

The chucking arm 21 is attached to the lower end of the arm shaft 15 via a shaft 22 so as to be freely openable and closable, and has arm melons 2ia and 21b at the tip, and a cylinder 2.
3, it can be opened and closed as necessary.

Reference numeral 20 denotes a sleeve integrally attached to the auxiliary boom 16 for rotatably fixing the arm shaft 15 to the auxiliary boom 16.

Furthermore, 17a is pin P4. P2, and 17b is connected to pin P3. P, a connecting rod rotatably connects the boom 9 and the auxiliary boom 16, 18 is a spring for constantly pulling the auxiliary boom 16 in the direction of the support column 1, and 19 is attached to the auxiliary boom 16, and is constantly deformable. The guide rollers attached to come into contact with the cam plate 3 are shown respectively.

FIG. 1 shows a case where the boom 9, that is, the chucking arm 21 is in a position that matches the horn H of a welding machine (not shown), and the workpiece W that has completed the flash butt welding process is removed from the horn H and returned to the line again. In the cylinder 2
3 to move the workpiece W using arms 21a and 21b.
is held, and then the boom 9 is rotated clockwise in the figure by acting on the cylinder 8 shown in FIG.

At this time, since the chain 14 is stretched between the fixed sprocket 12 and the free sprocket 13, which have the same diameter, the endless chain 14 meshing with the fixed sprocket 12 has the number of moving teeth on the fixed sprocket 12 ( Accordingly, the free sprocket 13 is rotated in the same direction by the angle of movement).

Therefore, the arm shaft 15 integrated with the free sprocket 13 also rotates sequentially as the boom 9 moves, and the workpiece can be moved while always maintaining the orientation in a constant direction.

Furthermore, at this time, the auxiliary boom 16 supporting the arm shaft 15 is not only constantly drawn toward the support column 1 by the spring 18, but also because the roller 19 is in contact with the deformable cam plate 3 attached to the support column 1. As clearly shown in FIG. 3, the auxiliary boom 1
6 is moved outward in the longitudinal direction against the tensile force of the spring 18, the chucking arm 21 does not move in an arc over a certain section, but moves linearly parallel to the horn.

This linear movement section means a section sufficient to completely pull out the workpiece W from the horn H, and from now on, the deformed cam plate 3
The work W is placed in a predetermined position on the line by making an arcuate movement along the high step 3c of the line, and the work to take out the work is completed.

Also, when loading the workpiece into the horn H, the operation is reversed to that described above.

Since the tension bar 11 is constantly pulled by the springs S1 and S2, it always acts to absorb the loosening of the chain 14 due to a change in the distance between the sprockets 12 and 13 due to the relationship between the roller 19 and the deformable cam 3.

Also, the arm shaft 15 has a sleeve 20 attached only to the auxiliary boom 16.
Since the boom shaft 15 is rotatably supported by the boom shaft 15 and is not supported by the boom 9 in any way, the boom shaft 15 can move freely.

Since the present invention has the above-described configuration and operation, firstly, in the workpiece processing line, the workpiece can be fed into the horn of a welding machine or other processed equipment, etc., or removed while remaining in the same direction. Second, when loading and unloading the workpiece, the chucking arm holds the workpiece and moves completely away from the horn and other workpiece parts, and the workpiece is always oriented in the same direction as the production line. 3. In addition, since the workpiece can be moved linearly within a certain range along the longitudinal direction of the horn, there is no risk of the workpiece contacting the horn and falling. In addition, it has various beneficial effects, such as eliminating manual work and making complete automation possible.

In the above embodiments, welding of automobile wheels has been described, but it goes without saying that the scope of application of the present invention is not limited thereto.

[Brief explanation of drawings]

Fig. 1 is a cutaway or cross-sectional side view of a part of a workpiece loading/unloading device according to an embodiment of the present invention, Fig. 2 is a plan view thereof, and Fig. 3 shows a deformed cam plate and a roller attached to a column. FIG. 3 is an explanatory diagram showing a movement locus of the chucking arm due to contact with the chucking arm. 1... Support column, 3... Deformed cam plate, 9...
...Boom, 11...Tension bar,
12...Fixed sprocket, 13...
Free sprocket, 14...Chain, 15
...Arm axis, 16...Auxiliary boom,
ITa, 17b...Connection rod, 19...
Roller 21...Chucking arm.

Claims (1)

[Claims] 1. A boom 9 which is rotatably supported by the support column 1 and has a fixed sprocket 12 on its rotation axis, and an auxiliary boom 16 which is swingably held by the boom via connecting rods 17a and 17b. a spring 18 that constantly biases the auxiliary boom 16 in the female direction; a sleeve 20 that is supported in two parts by the auxiliary boom and whose upper end projects above the boom 9; and a sleeve 20 that is rotatably inserted into the sleeve. Moreover, a chucking arm 21 is provided at the lower end of the chucking arm 21.
Furthermore, an arm shaft 15 to which a free sprocket 13 is attached to the upper end, a chain 14 stretched between the sprocket 12 and the free sprocket 13,
A tension bar 11 that applies tension to the chain, a guide roller 19 provided at the end of the auxiliary boom 16 near the column 1, and a deformable cam plate 3 integrally attached to the column 1 side corresponding to the guide roller. A device for attaching and removing a cylindrical workpiece, characterized in that the deformable cam plate has a low step portion 3a, a tapered portion 3b, and a high step portion 3C.