JPS6351818B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-axis tightening device that uses a multi-axis tightening head to simultaneously tighten a workpiece having a plurality of tightening points. This invention relates to a head-exchangeable multi-shaft tightening device that can be freely replaced in response to model changes.

Conventionally, this type of device has either a base with a removable head that can be attached and removed as needed, or a base with multiple heads fixed and the corresponding head attached to the base. There are known machines in which workpieces are transported underneath, but the former requires time and effort to replace the heads, and the latter requires a processing station for each head to carry the workpiece. This has the disadvantage of requiring a large installation space.

An object of the present invention is to provide an apparatus that eliminates such inconveniences, and includes a support column arranged on one side of a processing station, and an upper and lower support column to which an air tube is connected via piping to the support column. an annular rail that slidably supports a plurality of multi-axis tightening heads each having a movable connecting head, a nut runner connected to the air tube via the connecting head, and a socket into which a rotating shaft of the nut runner is inserted; An index device for selecting one of the multi-axis clamping heads on the annular rail is provided on the lower surface of the connecting head and on the processing station, and a movable rail for processing moves the annular rail up and down on the processing station. and a movable attachment/detachment rail that moves up and down on an exchange position adjacent to the processing station.

Next, one example of implementing the present invention will be explained with reference to attached drawings.

In the drawing, 1 is a column, 2 is a processing station placed in front of the lower part of the column 1, and 3 is an annular rail provided in upper and lower stages on the outer periphery of the upper part of the column 1. A plurality of attached heads 4, for example four, are each supported movably in the circumferential direction via a frame 5, and the front sides of the annular rails 3, 3 are constructed with movable rails 3a, 3a that can be raised and lowered. An arbitrary one of the multi-axis tightening heads 4 is selectively moved onto the movable rails 3a, 3a by an indexing device 6 provided on the upper part of the support column 1, and the selected multi-axis tightening head 4 is moved onto the movable rails 3a, 3a. 3a is lowered above the processing station 2.

To explain this in more detail, the movable rails 3a, 3
As clearly shown in FIG. 2, a is attached to an elevating base 8 on the front side of the support column 1 which is raised and lowered by an elevating cylinder 7, and is raised and lowered together with the elevating base 8, and the index device is 6 is the first
As clearly shown in the drawings and FIG. 2, there is a Geneva mechanism 10 consisting of a Geneva pin 10a driven by a motor 9 and a Geneva gear 10b that engages with the Geneva pin 10a, and an index arm 11 connected to the Geneva gear 10b.
and an engaging pin 14 connected to the cylinder 12 on the arm 11 and removably fitted into the pin hole 13 on the top surface of each pedestal 5. Depending on the type of
First, the index arm 11 is rotated via the Geneva mechanism 10 onto the pedestal 5 equipped with the multi-axis tightening head 4 corresponding to the workpiece a, and then the engagement pin 14 is inserted into the pin hole 13 on the pedestal 5 by the cylinder 12. In the fitted state, the index arm 11 is rotated back and the head 4 is selectively moved onto the movable rails 3a, 3a. 8a in the drawing
indicates a guide bar of the elevating base 8.

The multi-axis tightening head 4 is equipped with an upper plate 4a, a middle plate 4b, and a lower plate 4c supported vertically and movably.The lower surface of the lower plate 4c corresponds to each tightening hole in the workpiece a. The lower plate 4c is slidably inserted into each socket 15 and connected via each rotating shaft 17 between the socket 15, a work pusher 16 that contacts the workpiece a, and the upper plate 4a and the middle plate 4b. When the head 4 is lowered, the workpiece pusher 16 first contacts the workpiece a to prevent the lower plate 4c from lowering. The rotating shaft 17a extending from each nut runner 17 descends, and the rotating shaft 17
The socket 15 provided at the lower end of workpiece a was engaged, and each bolt b was screwed into each tightening hole of workpiece a to perform the tightening process.

In the drawing, reference numeral 19 denotes a connecting head that can connect a compressed air source (not shown) as a power source to the multi-axis tightening head 4 selected on the movable rails 3a, 3a. It is provided on a support base 21 attached to the upper end of the above-mentioned lifting base 8 via a connecting cylinder 22 so as to be vertically movable between a lower connecting position and an upper releasing position, and an air tube 23 extending from a compressed air source is attached to the support base 21. A common air supply joint 24 connected to each of the nut runners 17 is provided on the upper plate 4a of the multi-axis tightening head 4, and the connection head 19 is moved downward to the connection position. According to the air supply joint 2
The air tube 23 was connected to 4.
Each shaft tightening head 4 is fitted and supported by an upper plate 4a and a middle plate 4b on pins 5a, 5a on a pedestal 5 so that it can be pulled out upwardly, and is attached to one side of the annular rails 3, 3, for example, on the left side. As shown in the third figure, movable rails 3b, 3b for attachment/detachment are raised and lowered by lifting/lowering cylinders 25 for attachment/detachment.
During the lowering of the movable attachment/detachment rails 3b, 3b, the exchange cart 26 receives the middle plate 4b of the multi-axis tightening head 4 on the rails 3b, 3b as shown in FIG. When the rails 3b, 3b are lowered, the engagement between the head 4 and the pins 5a, 5a is released, thereby allowing the multi-shaft tightening head 4 to be replaced.

Next, to explain the operation of the apparatus of the present invention, the multi-axis clamping head 4 corresponding to the type of workpiece a to be carried onto the processing station 2 is selected on the movable rails 3a, 3a by the operation of the above-mentioned indexing device 6. Then, the connecting head 19 is moved down to the connecting position, the air tube 23 connected to the compressed air source is connected to the air supply joint 24, and then the movable rails 3a, 3
By lowering a, the multi-shaft tightening head 4 is connected to the connecting head 1.
9, it descends toward the workpiece a on the processing station 2, and the workpiece a is tightened as described above.Then, the multi-axis tightening head 4 is raised by the movable rails 3a, 3a, and moves to the next workpiece a. Prepare for the delivery.

If the next workpiece a to be brought in is of a different type,
The connecting head 19 moves upward to the release position, another multi-axis tightening head 4 is selected on the movable rails 3a, 3a by the indexing device 6, and the same operation as above is repeated to tighten the workpiece a. will be held.

In this way, according to the present invention, the column 1 disposed on one side of the processing station 2 has a vertically movable connecting head 19 which is located on the processing station 2 and connects the air tube 23, and the connecting head 19. A nut runner 17 that is connected to the air tube 23 via the nut runner 17 and a rotating shaft 1 of the runner 17.
An annular rail 3 that slidably supports a plurality of multi-axis tightening heads 4 having sockets 15 into which 7a is inserted, and one of the multi-axis tightening heads 4 on the annular rail 3 is connected to the connecting head 19. Since the indexing device 6 for selection is provided on the lower surface and above the processing station 2, the multi-spindle tightening head 4 having the socket 15 and the nut runner 17 is provided with the indexing device 6 on the lower surface of the connecting head 19 and for processing. When selected on the processing station 2, the nut runner 17 is connected to the air tube 23 by the movement of the connecting head 19, and the bolt engaging the socket 15 can be smoothly tightened. Since the movable rail 3a for machining moves up and down and the movable rail 3b for attachment/detachment moves up and down at a replacement position adjacent to the rail 3a, the plurality of multi-axis tightening heads 4 on the annular rail 3 can be used for machining. The workpiece is tightened by moving the movable rail 3a, and the head 4 is replaced by moving the movable attachment/detachment rail 3b. This has the effect of allowing tasks to be performed simultaneously without affecting each other.

[Brief explanation of the drawing]

Fig. 1 is a plan view of one example of the device of the present invention, Fig. 2 is a partially cut-away side view thereof, Fig. 3 is a partially cut-away front view thereof, and Fig. 4 is a side view showing an exchange cart for a multi-shaft tightening head. It is. 1... Support column, 2... Processing station, 3...
Annular rail, 3a...Movable rail, 4...Multi-axis tightening head, 6...Index device, 19...Connection head, a...Work.

Claims (1)

[Claims] 1. A support is disposed on one side of the processing station, and a vertically movable connecting head located above the processing station and connecting the air tube to the support, a nut runner connected to the air tube via the connecting head, and the nut. An annular rail that slidably supports a plurality of multi-axis tightening heads each having a socket into which the rotating shaft of the runner is fitted, and one of the multi-axis tightening heads on the annular rail on the lower surface of the connecting head. A selection index device is provided on the processing station, and the annular rail is divided into a movable rail for processing that moves up and down on the processing station, and a movable rail for attachment and detachment that moves up and down on an exchange position adjacent to the processing station. A head-exchangeable multi-shaft tightening device characterized by the following: