JPH0533234Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a multi-axis tightening device that can change the pitch according to the arrangement pitch of bolts.

(Prior Art) For example, in an engine assembly department, there is a need for a tightening device that can automatically tighten bolts even for multiple models of engines with different bolt pitch arrangements. The device disclosed in Japanese Utility Model Application Publication No. 11726/1986 was developed in response to these demands, and by attaching a nut runner to the output shaft of each step motor via an arm, it can be adjusted according to the arrangement pitch of the bolts. The pitch can be changed, and by using two rows of tightening devices and overlapping the rotation range of the step motor, it is possible to set a finer pitch. The device has economical problems, such as requiring five nut runners to tighten three bolts, and also relies on conveyor feed for longitudinal positioning. This method is inefficient in that the arrayed bolts must be tightened one by one.

(Problem to be solved by the invention) The invention was developed in view of these problems, and its purpose is to easily and accurately adapt to bolt pitch arrangements that differ depending on the model. The object of the present invention is to provide a new multi-axis tightening device.

(Means for Solving the Problem) That is, the present invention is a multi-axis tightening device to achieve the above problem, in which a plurality of nut runners are moved in the plane direction on a first movable frame that moves up and down for tightening. At the same time, a second movable frame is attached to the first movable frame so as to be able to approach and leave the first movable frame. A pitch converting means consisting of at least two guide members for guiding and fixing the pitch is detachably attached.

(Example) An example shown in the drawings will now be described.

FIG. 1 shows the overall structure of the device, which is roughly divided into a frame 1 that supports the nut runner mechanism 10 and the pitch changing mechanism 30 in a vertically movable manner, and a first cylinder 3 on the frame 1. The nut runner mechanism 10 moves up and down between the pitch change position and the retracted position by the second cylinder 27 on the nut runner mechanism 10. and a pitch changing mechanism 30 for positioning the bolts B in accordance with the arrangement pitch of the bolts B.

Next, to explain the structure of these details, the frame 1 has, on one side, a first movable support frame 11 that supports the nut runner mechanism 10 and a second movable support frame 31 that supports the pitch changing mechanism 30.
A guide rail 2 for guiding the first movable frame 11 is provided integrally in the vertical direction, and a first cylinder 3 for driving the first movable frame 11 is mounted on the top of the bracket 4.
The first movable frame 11 is fixed at the bottom.
A buffer member 5 is attached for applying braking at the tightening position.

On the other hand, the first movable support frame 11 that supports the nut runner mechanism 10 is slidably attached to the above-mentioned guide rail 2 on the frame 1 via sliders 12, 12 provided on one side of the first movable support frame 11. ,
As shown in FIG. 2, guide rails 13, 13 are provided on the lower surface thereof along the longitudinal direction. This embodiment is configured as a bearing cap C fixing device for an engine E as shown in FIG. Five guide rails 13 are arranged in parallel in the vertical direction of the paper to correspond to the five bolts B on one side and their standard pitch intervals, and these guide rails 13
A pair of nut runner support blocks 15, 15 are mounted via sliders 14, 14 so as to be slidable relative to each other in the longitudinal direction. This support block 15 is connected to a pitch changing mechanism 30 which will be described later.
A bracket 16 fixed to the base end side of the support block 15 is used to displace the nut runner 28, which is engaged with and supported by the nut runner 28, to correspond to the arrangement pitch of the bolts B, which differs depending on the model of the engine E.
The fixed brackets 17 on the first movable support frame 11 are connected via a common stroke rod 18 passed through each other, and between each bracket 16, 17 and between the end of the stroke rod 18 and the fixed bracket 17. By means of expansion springs 19, 19 interposed therein, it is configured to normally occupy a neutral position on the guide rail 13. A support pin 20 is also installed in the support block 15 just in front of the bracket 16, and an arm 24, which will be described later, is pivotably supported at its base end. A supporting sleeve 22 for a nut runner 28 and a guide pin 23 having a conical head are fixed to the arm 24 at the tip and center, respectively.
Also, at the rear end, there are two pushers 25, 25,
In other words, the two pushers 25, 25, which are inserted into the bracket 16 at the rear of the arm 24 and always protrude forward by the spring 26, maintain the arm 24 in a position with its axis A pointing correctly forward at all times.

On the other hand, the second movable support frame 31 that supports the pitch changing mechanism 30 has a slider 3 provided on one side thereof.
Guide rail 2 on frame 1 via 2, 32
A second movable support frame 11 is fixed to the first movable support frame 11 via a bracket.
It is connected to the rod end of the cylinder 27 and moves up and down relative to the first movable support frame 11.
It is configured to occupy both the pitch change position shown by the dotted chain line and the retracted position shown by the solid line.

By the way, the pitch changing mechanism 30 shown in FIG.
is configured to be removable on the second movable support frame 31 described above, and the machine frame 34 has a direction that is the same as the axis of the engine E, that is, a direction perpendicular to the plane of the paper in FIG. Two guide plate frames 35, 35 are rotatably supported on the shaft. This guide plate frame 35 is arranged so that the axis of each nut runner 28 is set to the bolt B depending on the model of the engine E.
This guide plate frame 35, which has a mange-shaped cross section, has four plates 36a to 36c oriented in the tangential direction thereof.
..., guide holes 37a to d for engaging the above-mentioned guide pins 23 on the arm 24, respectively.
are arranged in rows corresponding to the bolt arrangement pitch of each model. These guide plate frames 35, 3
Needless to say, the guide plate frames 35 and 5 are respectively supported at intervals such that they engage with the respective guide pins 23 and 23 on the arms 24 and 24 facing each other. ,35
The gear 4 has gears 38, 38 fixed to one end thereof, and these gears 38, 38 fixed to the shaft of the index actuator 39.
By meshing with each other at 0 degrees, rotation by 90 degrees and degree determination can be performed.

In FIG. 1, reference numeral 6 is a stopper provided at the lower end of the first movable support frame 11, 21 is a member on the first movable support frame 11 that comes into contact with the buffer member 5, and 29 is a stopper provided at the shaft end of the nut runner 28. Each socket is shown separately.

In a device configured in this way, if the engine E currently running on the line is switched from one model to another, and the arrangement pitch P of the bolts B for fixing the bearing cap C changes accordingly. First, the second cylinder 27 on the first movable support frame 11 is operated to extend its rod, and the second movable support frame 31 is lowered to the retracted position shown by the solid line in FIG. As a result, the guide plate frame 35 on the second movable support frame 31 engages with the guide pin 23 on the arm 24 and aligns the nut runner 28 with the bolt arrangement position a (FIG. 4) of the previous model. It also falls with this.

Therefore, the arm 24 released from the first plate 36a of the guide plate frame 35 is
Two pushers 25, 2 on the left and right that act on its base end
Correctly orient the center with the pressing force of step 5 (Fig. 3),
At the same time, the support block 15 also slides to the point where the two expansion springs 19, 19 are balanced and returns to the neutral position n (FIG. 4). Therefore, from this state, the index actuator 39 is operated, and the guide plate frame 35 is moved through the gear 40 fixed to the shaft end thereof and the gears 38, 38 meshing with the gear 40, as shown in FIG. in the direction of the arrow
The pitch is rotated 90° to determine the pitch, and the second cylinder 27 is operated again to raise the pitch changing mechanism 30 to the pitch changing position shown by the second solid line (FIG. 2).

As a result, the second plate 36b on the guide plate frame 35, which has newly come to face the guide pin 23, is moved through the guide hole 36b formed therein.
b receives the guide pin 23, and rotates the arm 24 around the fulcrum pin 20 while moving the axis of the guide pin 23, whose head has a conical shape, to the center of the hole 37b by the edge of the hole 37b; At the same time, while sliding the support block 15 on the guide rail 13, the nut runner 28 provided at the tip of the arm 24
to a new bolt arrangement position b (Fig. 4).

And as above, a new guide plate 36 is installed.
When the pitch conversion according to b is performed, as shown in FIG. Since the spacing across the two is also aligned with a new spacing l, if the first movable support frame 11 is lowered by the first cylinder 3 in this state, the nuts on all the bolts B can be tightened at the same time. It can be done.

Note that the distance that can be moved by the guide hole 37 on the guide plate 36 is smaller than the radius of the guide pin 23, but the distance from the fulcrum pin 20 of the nut runner 28 is sufficiently larger than that of the guide pin 23. Therefore, pitch conversion can actually be performed over a fairly large range.

(Effects) As described above, according to the present invention, a plurality of nut runners are supported on a first movable frame that moves up and down for fastening, and each of these nut runners is supported on at least two movable frames that are provided with guide parts.
Since the pitch conversion means consisting of one guide plate aligns the bolts in accordance with the bolt arrangement pitch on the work, even if the bolt arrangement pitch on the work is irregular, by using a guide member corresponding to this, these pitches can be easily aligned according to the bolt arrangement regardless of the number of nut runners.

In addition, this guide member is provided with a guide pin insertion hole, and this guide member is attached to the second movable frame that can move away from and approach the first movable frame. By approaching the movable frame and inserting a guide pin integrated with the nut runner into the guide member insertion hole, the nut runner can be automatically positioned and fixed.

[Brief explanation of the drawing]

Fig. 1 is a side view of a device showing one embodiment of the present invention, Fig. 2 is an enlarged view showing the main parts of the same device, and Fig. 3 is an enlarged view showing the main parts of the same device.
The figure is a bottom view, FIG. 4 is a top view of the pitch changing mechanism, and FIG. 5 is a diagram showing an example of the workpiece. 1... Frame, 2... Guide rail, 3...
First cylinder, 10...Nut runner mechanism, 11
...First movable frame, 15...Movable support block, 2
3... Guide pin, 24... Arm, 27... Second cylinder, 28... Nut runner, 30... Pitch changing mechanism, 31... Second movable frame, 35... Guide plate frame, 39... Index Actuator.

Claims (1)

[Scope of utility model registration request] The first movable frame moves up and down for tightening.
A plurality of nut runners, each of which is integral with a guide pin having a conical tip, are attached so as to be movable in the surface direction, and a second movable frame is attached to the movable frame so as to be able to move toward and away from the guide pin,
The second movable frame is provided with at least two guide members each having a guide pin insertion hole for guiding and fixing the nut runner through the guide pin so as to correspond to the bolt arrangement pitch of the workpiece. Shaft tightening device.