JP3489168B2 - Rotating jig table support structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary jig table support structure constituting an automatic welding apparatus using a welding robot.

[0002]

2. Description of the Related Art In recent years, automobiles have been assembled by an automated line in which robots are arranged, and the welding process for various members is no exception.

As a welding device used in this automated line, for example, in Japanese Utility Model Laid-Open No. 63-174990, a work is fixed to a tilt frame which is rotatable with respect to a horizontal axis, and the work is fixed to the work. A spot welding device configured to perform multi-face welding is disclosed.

Separately from this, a work is fixed to a turntable rotatable about a vertical axis through a jig,
There is generally known a welding apparatus configured so that a plurality of welding robots arranged around a turntable can continuously and automatically perform welding.

FIG. 5 shows an example of the structure of the rotary jig table formed at the center of the above apparatus. A bearing is supported at the center of an intermediate table 52 laid on the base 50 through a support member 51. The base 53 is installed and the support base 5
A plurality of jigs 55, ...
A turntable 56 on which 5 is mounted is installed.
The turntable 56 is rotatably supported by a plurality of rollers 57 ... 57 arranged between the intermediate table 52 and the turntable 56 and the bearing 54.

In this device, the bearing 54
Is composed of an inner race 58 and an outer race 59. The inner race 58 is fixed on the bearing support 53 and the outer race 59 is fixed on the turntable lower surface 56a.

[0007]

In the structure for supporting the turntable through the bearing as described above,
When it is used for a long period of time, rotation of the bearing is deviated due to wear of the bearing and the like, which causes a problem that the accuracy of positioning the work with respect to the welding point is lowered. Therefore, in this type of welding device, it is necessary to periodically perform maintenance such as bearing replacement.

However, in the structure in which the inner race of the bearing is fixed on the bearing support as described above, it is necessary to lift the turntable to replace the bearing. However, since the turntable on which the jig is mounted is very heavy, a large-scale device such as a crane is required to lift it up. Therefore, it takes a very long time to replace the bearing, which causes a problem such as a decrease in machine time.

Therefore, the present invention is directed to maintenance of the device,
In particular, when replacing the bearings, the present invention provides a turntable support structure that allows the bearings to be replaced in a short time without lifting the turntable, thereby improving machine time.

[0010]

In order to solve the above-mentioned problems, the supporting structure of the rotary jig table according to the present invention is characterized in that it is constructed as follows.

First, the invention according to claim 1 of the present application (hereinafter,
The first invention) includes a turntable on which a plurality of jigs are placed, a bearing support installed in the center of the turntable to rotatably support the table via a bearing, and a turntable that rotates. In a supporting structure of a rotary jig table having a driving means for causing the turntable to be held when the bearing is removed, an outer race of the bearing is provided on a lower surface of the turntable, and an inner race is provided on an upper portion of the bearing support base. It is characterized in that it is attached to the lower surface of the flange portion from above, respectively, and the bearing support base is installed so as to be able to be lifted by a predetermined amount when replacing the bearing.

The invention according to claim 2 of the present application (hereinafter,
According to a second invention), the drive means in the first invention is configured to rotate the turntable via an outer race of a bearing mounted on the lower surface of the turntable, and the drive means can be detached from the outer race when the bearing is replaced. It is characterized by having done.

[0013]

The turntable on which the jig is placed is supported by a bearing support base that is removable from the center of the turntable via a bearing, and the inner race of the bearing is provided above the bearing support base. The outer race is attached to the lower surface of the turntable from above on the lower surface of the flange portion, and the turntable is removed between the turntable and the intermediate table on which the turntable is placed when the bearing is removed. Since a holder for holding is arranged, when replacing the bearing, while holding the turntable by the holder, remove the bearing from above and raise the bearing support by a predetermined amount. The bearing can be pulled out from the side. Therefore, it is not necessary to lift up the turntable on which the jig is placed in order to remove the bearing, so that the bearing can be replaced in a short time and the line stop time can be shortened.

Especially, when the bearing is removed, the drive means which has driven the turntable through the outer race of the bearing can be detached rearward from the outer race, so that the bearing can be easily replaced.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show the structure of a rotary jig table 1 of a welding apparatus according to the present invention, in which an intermediate base 4 is laid on a base 2 via a plurality of supporting members 3 ... A bearing support 5 is mounted on the intermediate base 4, and a turntable 9 is installed on the support 5 via a bearing 8 composed of an inner race 6 and an outer race 7. At the center of the bearing support 5, a removable rotary socket 10 is installed.
When 0, the electric cords 11 ... 11 from the fixed position are wired without being twisted by the rotating jigs 12.

Further, the intermediate table 4 and the turntable 9
In between, rollers 13 ... 13 that support the turntable 9 without inhibiting the rotation of the turntable 9 are arranged along the outer edge of the turntable 9 at a total of eight positions, and the bearing 8 14 for fixing the turntable 9 at the time of replacement are arranged at a total of four points. A drive unit 1 including a motor 15 and a speed reducer 16 is provided between the base 2 and the intermediate base 4.
7 is provided.

The roller 13 is rotatably supported by the upper portions of a pair of left and right brackets 13a, 13a having an L-shaped cross section. Further, the drive unit 17 for rotating the turntable 9 adjusts the rotation generated by the motor 15 to a predetermined rotation speed by the speed reducer 16, and the pinion gear 18 formed above the speed reducer 16.
The pinion gear 18 is connected to the ring gear 1 formed on the outer race 7 of the bearing 8.
9 is engaged with the ring gear 19 to transmit a rotational force to the ring gear 19 to rotate the turntable 9. Further, the drive unit 17 is detachable from the outer race 7 so as not to hinder the removal of the bearing 8.

Next, the supporting structure of the turntable 9 which is a feature of the present invention will be described with reference to FIG.
The bearing support base 5 has a hollow cylindrical shape having flange portions 20 and 21 at its upper and lower ends, and is fastened to the intermediate base 4 by bolts 22 ... 22 at a plurality of locations on the flange portion 21 at the lower end. In addition, the flange portion 20 at the upper end
A plurality of holes 24 ... 24 through which bolts 23 ... 23 for fixing the inner race 6 of the bearing 8 are inserted in the lower surface 20a of the
And a plurality of engagement holes 2 are formed in the upper surface 6a of the inner race 6 of the ring-shaped bearing 8 so as to engage with the holes 24 ... 24 formed in the bearing support 5.
5 ... 25 are formed in the inner race 6 from the upper surface of the bearing support 5 to these holes 24 ... 24, 25 ... 2
It is fastened with a plurality of bolts 23 through 5.

On the other hand, a plurality of holes 26 ... 26 are formed in the outer edge portion of the turntable 9 as well as the bearing 8
27 are formed in the upper surface portion 7a of the outer race 7 as well. The outer race 7 of the bearing 8 is bolted into the holes 26 ... 26, 27 ... 27 from above the turntable 9 respectively.
It is fastened by passing 28.

A ring gear 19 that engages with the pinion gear 18 of the speed reducer 16 is formed on the outer peripheral surface of the outer race 7 of the bearing 8.

Next, the operation of the above configuration will be described with reference to FIGS. 2 and 4.

The turntable 9 on which a plurality of jigs 12 ... 12 are mounted is supported by a bearing support 5 at the center of the turntable 9 via a bearing 5, and the outer edge of the turntable 9 and an intermediate stand. A plurality of rollers 13 ... 1 that rotatably support the turntable 9 are provided between the rollers 4.
3 and a plurality of jacks 14 ... 14 that support the turntable 9 when the bearing 8 is replaced, the position of the turntable 9 is maintained even if the bearing 8 is removed. .

The inner race 6 of the bearing 8 is on the lower surface 20a of the flange portion 20 formed on the upper end of the bearing support 5, and the outer race 7 is on the lower surface 9a of the turntable 9. Since they are fixed by 23 ... 23, 28 ... 28, by removing these bolts 23 ... 23, 28 ... 28, the inner race 6 and the outer race 7 of this ring-shaped bearing 8 are fixed to the bearing support 5 and the turn. By removing the bearing support 5 which is detachable from the table 9 and fixed to the inside of the bearing 8 by a plurality of bolts 22 ... 22 and lifted up by a predetermined amount, the rotary socket 10 is removed. The bearing 8 can be pulled out laterally.

Therefore, it is not necessary to mount the plurality of jigs 12 ... 12 to remove the bearing 8 and lift the heavy turntable 9 upward.
The bearing 8 can be replaced in a short time, and the downtime of the line can be shortened.

Particularly when the bearing 8 is removed, the drive unit 17 having the pinion gear 18 meshing with the gear 19 formed on the outer peripheral portion of the outer race 7 can be disengaged from the outer race 7 so that the bearing 8 is further removed. Will be easier to remove.

[0026]

A turntable for mounting a plurality of jigs is supported by a bearing support stand, which is removable in the center of the turntable, via a bearing.
The inner race of the bearing is attached to the lower surface of the flange portion formed on the upper part of the bearing support, and the outer race is attached to the lower surface of the turntable from above, respectively, and a support for holding the turntable is provided. Since the bearings are installed, when the bearings are replaced, the bearings can be removed by removing the bearings from above while holding the turntable by the support, raising the bearing support by a predetermined amount, and removing the rotary socket. It can be pulled out from the side. That is, it is not necessary to lift the turntable on which the jig is placed, and the bearings can be replaced in a short time, so that the line stop time can be reduced and the machine time can be improved.

Particularly when the bearing is removed, the drive unit meshing with the gear formed on the outer peripheral portion of the outer race can be removed from the outer race, so that the bearing can be removed more easily.

[Brief description of drawings]

FIG. 1 is a plan view of a rotary jig table according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the device.

FIG. 3 is an enlarged cross-sectional view showing a turntable support structure which is a feature of the present invention.

FIG. 4 is a cross-sectional view showing a state of each member around the bearing during maintenance.

FIG. 5 is a sectional view showing a configuration of a conventional rotary jig table.

[Explanation of symbols]

1 Rotating jig table 5 bearing support 6 Inner Race 7 outer race 8 bearings 9 turntable 9a Bottom of turntable 12 jigs 13 Roller 14 jacks 17 Drive unit (drive means) 20,21 Flange part 20a Flange bottom surface

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B23K 37/00 B23K 37/047 B23Q 1/16

Claims (2)

(57) [Claims] 1. A turntable on which a plurality of jigs are mounted, a bearing support stand installed in the center of the turntable for rotatably supporting the table via bearings, and a drive for rotating the turntable. A support structure for a rotary jig table having means and a holder for holding the turntable when the bearing is removed, wherein the outer race of the bearing is provided on the lower surface of the turntable.
The inner races are attached to the lower surface of the flange portion provided on the upper part of the bearing support from above respectively, and the bearing support is installed so that it can be lifted by a predetermined amount when the bearing is replaced. Support structure for rotating jig table. 2. The drive means is configured to rotate the turntable through an outer race of a bearing mounted on the lower surface of the turntable, and is detachable from the outer race when the bearing is replaced. The support structure for the rotary jig table according to claim 1.