JPH0218271B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movable floor that shields a lift-and-carry transfer between stages in an automobile body manufacturing line.

In general, the lift-and-carry transfer T relationship in the vicinity of the stages of an automobile body manufacturing line has a structure as shown in FIG. 1, for example.

Stages S1 and S2 are divided by a fixed floor 2 together with a pair of movable floors 1 installed between them, and a lift and carry system is installed below the joint of the movable floors 1 and 1 across both stages S1 and S2. Transfer T is installed.
That is, two transfer rails 3 are supported by an air cylinder 4 erected on a base B via a rail support bracket 5, and are provided so as to be movable up and down. Then, the rail 3 is connected to the work W
A carrier section 7 to which fingers 6 are attached for carrying a load is mounted so as to be reciprocally movable by being sandwiched from above and below by a cam follower 8 of the equipment (see Fig. 2). Note that 9 is a set of fixed posts for working on the stage S1, which is erected on the base B.

The carrier section 7 loaded with the workpiece W is moved to the stage S.
When moving from stage 1 to stage S2, the movable floor 1 is opened upward in a double-door pattern and the movable floor 1 is opened and closed, and a conventional mechanism for opening and closing this movable floor 1 is as shown in FIG. 2, for example. .

The movable floor 1 has its outer end connected to the stage S2.
It is rotatably attached by a pin 10b to a protrusion 10a formed to protrude inward at the upper part of a fixed bracket 10 attached to the lower surface of the fixed floor 2 on the stage S1 side, and at the lower end of the fixed bracket 10. The tip of the piston rod 12 of the actuator 11, which is rotatably pinned to the actuator 10c, is attached to an L that projects downward from the outer end of the movable floor 1.
It is rotatably pinned and connected to the tip of the arm 1a of the mold, and when the rod 12 retreats, the outward protrusion 1b of the arm 1a comes into contact with the inward protrusion 10d of the fixed bracket 10. movable floor 1
is flush with the fixed floor 2.

By the way, when loading the workpiece W on the finger 6 and transferring it from the stage S1 to the stage S2, first, the actuator 11 is operated to advance the piston rod 12 and the arm 1a is pushed up, so that the workpiece W can be moved using the pin 10b as a fulcrum. floor 1
After rotating upward and opening, open air cylinder 4.
The transfer rail 3 is raised together with the carrier section 7 through the rail support bracket 5, and the workpiece W set on the fixed post 9 is received by the finger 6, and the carrier section 7 is moved onto the rail 3 in this state. Move from stage S1 to stage S2, then move to air cylinder 4
The workpiece W is transferred from the finger 6 to a fixed post (not shown) of the stage S2 by the lowering operation.

At the same time, the piston rod 12 of the actuator 11 is moved backward to move the outer protrusion 1b to the inner protrusion 1 so that it can cross over the transfer T in order to work on the transferred workpiece W.
0d to close the movable floor 1 and return it to its original state. Therefore, the carrier section 7 is passed from the stage S2 under the movable floor 1, and the stage S
1 and prepare for the next workpiece transfer.

However, such conventional movable floor opening/closing mechanisms are configured to use actuators such as air cylinders and hydraulic cylinders, so they require valves to operate the actuators and switches to promote the operation procedure. In addition to requiring various equipment such as a control device, the two operations of opening and closing the movable floor are additionally required, and
Since it is also necessary to establish an interlock, etc., the operation time for this is further added, resulting in a problem that the cycle time for transferring the workpieces becomes longer.

This invention was made in view of these conventional problems, and involves mechanically interlocking the raising and lowering operations of the transfer rail and the opening and closing operations of the movable floor using a link mechanism, so that they are performed simultaneously. The purpose is to solve the above problems by making it possible to

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Note that the same members as in the conventional example are designated by the same reference numerals, and their explanations will be omitted.

First, I will explain the configuration.

In this embodiment, the actuator 11 of the conventional example is removed and a link mechanism R is provided in its place, and the other configurations are almost the same.

Reference numeral 20 denotes a fixed bracket attached to the lower surface of the fixed floor 2, and the outer end of the movable floor 21 is rotatably attached to the upper inward protrusion 20a with a pin 20b. Outward protrusion 21b of L-shaped arm 21a protruding from the lower surface
However, the movable floor 21 is flush with the fixed floor 2 while in contact with the inward protrusion 20d of the fixed bracket 20. The main link 22 is attached to a pin 22 at the lower end 20c of the fixed bracket 20.
It is rotatably attached by a.

On the other hand, a bracket 23 is attached to a required location on the outer surface of the transfer rail 3, and the lower end of the bracket 23 and the tip of the main link 22 are rotatably connected via an operating link 24 by a pin 24a and a pin 24b, respectively. There is also a movable floor 21
The distal end of the arm 21a and a required intermediate portion of the main link 22 are rotatably connected via a sub link 25 by a pin 25a and a pin 25b, respectively, and constitute a link mechanism R.

Next, the effect will be described.

In order to receive the workpiece W set on the fixed post 9 into the finger 6, when the transfer rail 3 is raised together with the attached bracket 23 by the operation of the air cylinder 4, the bracket 23 is moved through the operating link 24. Main link 22
is rotated upward using the pin 22a as a fixed fulcrum. Therefore, since the sub link 25 rises, the movable floor 21 is pushed up by the tip of the arm 21a,
The transfer rail 3 rotates upward and outward using the pin 20b as a fixed fulcrum, and when the transfer rail 3 reaches its upper limit, it unfolds to a substantially vertical position. Therefore, after moving the carrier section 7 loaded with the workpiece W from stage S1 to a predetermined position on stage S2, the transfer rail 3 is lowered together with the carrier section 7 by the reverse operation of the air cylinder 4, and the stage S2 is fixed from the finger 6. The workpiece W is transferred to a post (not shown). At this time, the bracket 23 also descends together with the rail 3, so the movable floor 21 rotates inwardly and downwardly, that is, in the closing direction, by the reverse action of the link mechanism R when it rises, and when the rail 3 reaches its lower limit, The fixing bracket 20 returns to its original closed state in which the outer protrusion 21b is in contact with the inward protrusion 20d. Next, the carrier section 7 passes under the movable floor 21 and returns to its original predetermined position on the stage S1, becoming ready for the next work transfer.

In addition, in this embodiment, two stages S1,
Although the case of S2 has been taken up, it goes without saying that the present invention can also be applied to a case where three or more stages are arranged in series, and the same operation can be performed.

As explained above, according to this invention,
The opening/closing mechanism of the movable floor is a link mechanism that can be linked using the rising and falling movements of the transfer rail, so it is not only the actuator that opens and closes the movable floor, but also various equipment such as related control devices, Operating sources such as compressed air, hydraulic pressure, and electricity are no longer required, and various costs such as equipment costs, maintenance costs, power costs, and related labor costs can be reduced.Furthermore, the vertical movement of transfer rails and the opening and closing of movable floors can be reduced. Since these steps can be carried out simultaneously, it is possible to shorten the workpiece transfer cycle time, which has a significant effect on improving productivity and reducing costs.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an outline of the configuration related to lift and carry transfer, Fig. 2 is a front view showing a conventional opening/closing mechanism for a movable floor, and Fig. 3 is an opening/closing mechanism for a movable floor according to the present invention. FIG. 4 is a front view showing the state of the link mechanism when the movable floor is opened. T...Lift and carry transfer,
S1... Stage, S2... Stage, R... Link mechanism, 2... Fixed floor, 3... Transfer rail, 21... Movable floor, 22... Main link, 24... Operating link, 25... secondary link,
20... fixed bracket, 20a... upper inward protrusion, 21a... arm, 23... bracket.

Claims (1)

[Claims] 1. On the movable floor that shields the lift and carry transfer installed between each stage for continuous processing,
The other end of the main link, one end of which is pivotally supported on the lower end of the fixed bracket attached to the lower surface of the fixed floor, is rotatably connected to the lower end of the bracket attached to the transfer rail by an operating link. At the same time, the tip part of the arm protruding from the lower surface of the outer end of the movable floor whose outer end is pivotally supported by the inwardly projecting part of the upper part of the fixed bracket, and the intermediate part of the main link are attached as secondary parts. A movable floor characterized by having a link mechanism rotatably connected to each other by links.