JPS6380995A - Automatic reversing device for long-size steel frame member - Google Patents

Abstract

PURPOSE:To expand a working area and to improve productivity by maintaining a chair track of a closed loop in a trapezoid by four wheels and reversing a member which is carried in by adjusting an interval of the lower side wheels and adjusting the sag of the track by the normal rotation and the reverse rotation of the four wheels. CONSTITUTION:A closed-loop caterpillar 11 consisting of a chain is maintained in the trapezoid by the four wheels. The member 1 such as the long-size steel frame, etc., is carried from a chain conveyor 12 in the chain caterpillar 11 which is rotated normally. After the member 1 is taken in the sage 13 taking place on the chain caterpillar 11, the chain caterpillar 11 is stopped. At this time, the interval between the lower side two wheels is shortened. Next, the chain caterpillar 11 is rotated reversely and the member 1 is reversed in the sag 13. The chain caterpillar 11 is returned to the normal rotation and the member 2 after being reversed is carried out by a chain conveyor 16. The chucking time is shortened and the restriction of a reverse angle of the long-size member 1 is eliminated by this mechanism.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an automatic reversing device for a long iron member.

[Conventional technology]

At present, the devices for reversing long steel members such as columns and beams are shown in Fig. 9 (a) (referred to as type A) and Fig. 9 (b).
(referred to as type B), Figure 9 (C) (referred to as type C)
A reversing device as shown in the figure below has been developed and is in use.

C Problems to be Solved by the Invention] When the reversing device of the prior art described above is used as a peripheral device and welding work is performed using an automated device such as a robot, the following problems occur.

(1) Problems with the positional relationship between the center of inversion, the center of the member, and the work space.

In the type A reversible bag as shown in the schematic diagram of FIG. 6(a), since the reversal center 3 and the member center 4 are the same (the sixth
(Fig. 6(b)) In many cases, the work space spreads out on both sides of the member, 5 before inversion and 6 after inversion (Fig. 6(C)). For this reason, multiple pots 7 are required on both sides of the parts (Fig. 6 (d)), and robots that can work by climbing over the parts are required. I'm inviting you.

On the other hand, in the type B and type C reversing devices as shown in the schematic diagram of FIG. 7(a), the reversing center 3 and the member center 4 are not the same but eccentric (FIG. 7(b)). The work space of the front 5 and the rear 6 can be shared on the inversion center side, but the eccentricity is limited due to the capacity of the device, and the shared space is extremely small (Fig. 7 (C)). ? 18 prevents movement along the longitudinal direction of the member, making it impossible to use it as a work space for robots 7, etc. (Fig. 7(d)
)), in an ideal reversal, as shown in Fig. 5, the member rotates eccentrically with respect to the reversal center, and the work space 5.
6 can be shared compactly (Figure 5 (a)), L
There must be no interference so that the robot 7 etc. can move along the longitudinal direction of the member in the shared work space (No. 5).
Figure (b)) is required.

(2) Interference problem.

As shown in FIG. 8, the reversing devices 8 of types A, B, and C are unsuitable for the work area of the robot 7 because of the problem of interference 18 with the robot 7.

(3) Problem with chuck function.

In the type A reversing device, it takes time to center and adjust the chuck every time the cross-sectional size of the member changes. On the other hand, the size of the members of the Type C reversing device is limited.

(4) Problem of reversible angle.

Type B inversion devices cannot invert 90 degrees at a time, and type C inversion devices cannot invert 180'L at a time.

The present invention solves the above-mentioned problems at once, enables ideal inversion as shown in Figure 5 with compact equipment, reduces equipment costs, and allows parts to be placed within the robot's work area without interference. The purpose of the present invention is to provide an automatic reversing device for long steel members that maximizes the use of the working area, shortens the chuck time, and has no limit to the reversing angle.

[Means for solving problems]

The present invention is intended to solve the above-mentioned problems, and employs the following technical means. In other words, ■ an endless track consisting of a chain, ■ four wheels that move the chain orbit forward and backward and maintain the side profile of the chain orbit in a trapezoidal shape, and ■ two lower wheels among the four wheels. By changing the axle spacing and rotating the four wheels forward and backward, the amount of slack in the chain track formed above the chain track is adjusted, and a working space for reversing and processing the long steel members is created in the slack part. It consists of an axle moving device, and (1) a chain conveyor that also serves as a workbench for processing parts, which transports the parts onto the chain track, and a chain conveyor that transports the parts after being reversed from the chain track.

[Effect]

The present invention utilizes the slack of the chain to invert a long steel member and forms a work space in which the steel member can be processed, and is characterized by having both inverting and processing functions. This is an automatic reversing device, and its operation will be explained with reference to the drawings.

FIG. 1 shows an embodiment of the invention. The present invention includes a chain track 11 having a closed and loose endless track, four wheels with tin rockets (two fixed axle wheels of 9 degrees, two movable axle wheels of 10 degrees) for rotating the chain track 11 in the forward and reverse directions, and 2 for adjusting the slack 13 stitches of the chain track 11
It consists of an axle moving device that adjusts the axle spacing between wheels in three stages (A, B, and C), and a power source (none of which is shown) that drives these devices. Note that this device includes a chain conveyor 12 for transporting the member (before reversal) 1 onto the chain track 11, and a chain conveyor 12 for transporting the member (after reversing) 2 onto the chain track 1.
In addition to providing a chain conveyor 16 for carrying out from 1,
The end of the chain conveyor 12, 16 also functions as a table for processing parts.

FIG. 4 is an explanatory diagram of the reversal action, and the work sequence of the present invention can be classified into the following five steps.

■ Carrying in (Fig. 4 (a)) Rotate the chain conveyor 12 (in the direction of the arrow) to
(before reversal) is carried into the chain track 11. At this time, the axle position of the chain track 11 (shown in Fig. 1 and the same below) is A.
(The chain track is in the maximum tension state) 9 Then, the chain track 11 is rotated in the normal direction (in the direction of the arrow).

■Intake (Fig. 4(b)) Set the axle position to A+B (the chain track is in a moderately slack state), and after taking the member l into the slack 13 created in the chain track 11, stop the chain track 11. .

■Reversal (Fig. 4 (C)) Set the axle position to B (the chain track is moderately slack), reverse the chain track 11 (in the direction of the arrow), and reverse the member within the slack 13 of the chain track 11 ( arrow direction)
let

■Unloading (Fig. 4(d)) Set the axle position to B4A (the chain is at its maximum tension), rotate the chain track 11 in the normal direction (in the direction of the arrow), and rotate the chain conveyor 16 (in the direction of the arrow). The member 2 is carried out.

■Working (Fig. 4 (e)) Set the axle position to C (the chain track is at its maximum slack and drooping state).

The space created by the hanging chain track 11 becomes the work space 15, on both sides of which the members 1 and 2 before and after inversion are placed on chain conveyors 12 and 16, respectively, and the robot 7 moves in the longitudinal direction of the members and For example, a welding operation can be carried out on the parts one after another.

The state is shown in FIG. 5(b).

〔Example〕

FIG. 2 shows a robot welding process for a large rectangular steel pipe column using the automatic reversing device for long steel members of the present invention. That is, the robot 7 sequentially welds the members 1 and 2 on the workbench of the conveyor 12.16 while welding them in the longitudinal direction (
When the welding of member 1.2, which is moving in the vertical direction in the figure, is completed, the work sequence shown in Fig.
is carried out on the conveyor 16, and the member 1 is reversed and transferred onto the workbench of the conveyor 16, and the member 1 is transferred onto the conveyor 12.
The next member 1 is carried to the workbench. The robot 7 again sequentially welds the members 1 and 2 on both sides, and repeats this work routine.

Further, in one embodiment of the present invention, as shown in FIG. 3, the hanging chain is configured to be stored under the floor. Therefore, not only the workers but also the trolley carrying the robot (not shown)
etc. can freely go in and out of the work space and sequentially process the members 1.2 on both sides (before and after inversion) while moving on the rail 17 along the long member.

In this embodiment, in order to prevent the member from slipping on the surface of the chain track 11 when the member is reversed, claws 14 are provided on the chain track 11 at a predetermined pitch.

〔Effect of the invention〕

The automatic reversing device for long steel members according to the present invention has the following excellent effects.

■Compact equipment configuration reduces equipment costs and saves space, improving productivity per medium area of the factory.

■Pre- and post-inversion parts can be installed on both sides of the robot, making effective use of the robot's work area and improving productivity per robot.

■Since the work of chucking the welded material to the reversing device and the need for chuck accuracy are eliminated, tact time can be reduced and productivity can be increased. Furthermore, even if the work to be welded is placed by a crane roughly to some extent, it does not affect the reversal of the parts.

■The reversal angle is arbitrary in 90° increments.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a front view of an example in which the present invention is used for robot welding of a large rectangular steel pipe column, and FIG. 3 is a perspective view of FIG. Figure 4 is from book 9. Figure 5 is a diagram explaining the function of the present invention, Figures 6 and 7 are diagrams explaining the function of the present invention.
8 and 8 are explanatory diagrams of problems in the conventional example, and FIG. 9 is a front view and a side view of the conventional example. 1... Member (before inversion) 2... Member (after inversion) 3.
... Center of reversal 4 ... Center of the member 5 ... Work space (before reversal) 6 ... Work space (after reversal) 7 ... Robot 8 ... Reversing device 9 ... City axis fixed ring 10 ... Axle movable wheel 11 ... Chain 71 [114 way 12 ... Chain conveyor 13 ...
Slack 14...Claw 15...Work space
16...Chain conveyor 17...Rail
18... Interference A, B, C... Axle position

Claims (1)

[Claims] 1 An endless track consisting of a chain, four wheels that move the chain track forward and reverse and maintain a trapezoidal side profile of the chain track, and an inner lower side of the four wheels.
By changing the axle spacing of the four wheels and rotating the four wheels in the forward and reverse directions, the amount of slack in the chain track formed above the chain track is adjusted, and the long steel member is reversed and processed on the slack part. a chain conveyor that also serves as a workbench for processing the member and transports the member onto the chain track, and a chain conveyor that transports the member after reversal from the chain track. An automatic reversing device for long steel members, characterized by: