JP2600864B2 - Work positioning device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work positioning apparatus for always fixing a rectangular plate-like work carried in a horizontal state at a fixed position, and in particular, to any work. Is automatically performed on the workpiece.

B. Summary of the Invention The four corners of a rectangular plate-shaped work that is carried in in a horizontal state are held by four corner plates, and the remaining three corner plates are referred to as one of these four corner plates. The workpiece is moved relative to a reference corner plate so that one corner of the work is always fixed at a fixed position.

C. Conventional technology A switchboard that houses various instruments, control and adjustment devices, switches, relays, etc., is equipped with the above-mentioned various devices as shown in Fig. 4, which shows the appearance of its vertically independent skeleton. A basic frame is formed by a floor panel 1 to be formed, columns 2 extending vertically upward from four corners of the floor panel 1, and a top panel 3 joined to the upper ends of the columns 2, respectively. Wall panels, doors, etc. can be assembled. When the switchboard is small and lightweight, the floor plate 1 and the top plate 3 and the column 2 are joined by fasteners such as bolts and nuts. However, in the case of a large and heavy switchboard, the floor plate 1 and the The plate 3 and the column 2 are generally welded together via a corner piece 4 for reinforcement called a gusset.

As shown in FIG. 4 and FIG. 5 which is an enlarged view of a portion taken in the direction of the arrow V, the corner piece 4 has three planes perpendicular to each other. 1, the support 2 and the top plate 3 are welded and stopped.

When a frame body is manufactured using this corner piece 4, the corner pieces 4 are usually first joined to the four corners of the floor plate 1 and the top plate 3, and then both ends of the column 4 are connected to the floor plate 1 and the top plate via the corner piece 4. It is to be joined to the plate 3. Therefore, unless the positional accuracy of the corner piece 4 with respect to the floor panel 1 and the top panel 3 is maintained high, the frame will have a distorted shape, and the installation of wall panels and the like will be deteriorated. Therefore, conventionally, a floor plate or a top plate is placed on the surface plate, and these floor plates or the top plate are fixed to the surface plate using a commercially available clamping jig, while corner pieces are pressed against four corners of the floor plate or the top plate. These corner pieces are also fixed to the floor plate or the top plate in a positioning state by using a commercially available clamp jig, and then the corner pieces are welded to the floor plate or the top plate.

D. Problems to be Solved by the Invention When a switchboard frame is manufactured by welding, in order to automate these series of operations, it is natural that these floorboards follow the changes in the dimensions and shape of the floorboards and top boards. And the top plate must be fixed at a fixed position on the surface plate.

However, conventionally, since the operator changes the position of the clamp jig each time, it takes time and effort, resulting in a decrease in work efficiency.

E. Means for Solving the Problems The work positioning device according to the present invention comprises: a first corner plate having a pair of positioning blocks projecting from a first corner of a rectangular plate-shaped work; A second corner plate protruding from a pair of positioning blocks respectively abutting on a second corner adjacent to the first corner of the work, and positioned diagonally with the first corner of the work. A third corner plate protruding from a pair of positioning blocks respectively abutting on a third corner adjacent to the second corner, and adjacent to a first corner and a third corner of the work. A fourth corner plate protruding from a pair of positioning blocks abutting on the corresponding fourth corners, and a work positioning device configured to hold the four corners of the work with the four corner plates. And a connector provided on the first corner plate and the second corner plate. The work is carried in by the bearer from the first corner plate and the second corner plate side toward the third corner plate and the fourth corner plate side, and the first or second corner plate is removed. A reference corner plate for positioning, the first or second corner plate of this reference is fixed at a fixed position and can be retracted and moved in a direction perpendicular to the carrying direction when the work is carried by the conveyor. Provided, the second or first corner plate is retracted in a direction parallel to the moving direction of the reference first or second corner plate, or conversely to the reference first or second corner plate side. The third corner plate and the fourth corner plate are provided so as to be capable of pressing the work, and the third corner plate and the fourth corner plate are respectively retracted in a direction parallel to a direction in which the work is carried in and a direction perpendicular thereto, or vice versa. Pressing movement of the work to the first or second corner plate side of the reference is possible Or the third or fourth corner plate is used as a reference corner plate for positioning, and the reference third or fourth corner plate is fixed at a fixed position and the work is carried in by the conveyor. Is provided so as to be retractable in a direction perpendicular to the loading direction, and the fourth or third corner plate is retracted and moved in a direction parallel to the reference moving direction of the third or fourth corner plate. Alternatively or conversely, the work can be pressed and moved to the reference third or fourth corner plate side,
The first corner plate and the second corner plate are respectively retracted and moved in two directions, a direction parallel to the direction in which the work is carried in and a direction perpendicular thereto, or the reference third or fourth corner plate. Characterized in that it is provided so that the work can be pressed and moved to the side.

F. Action When all the corner plates are retracted and moved, and the workpiece is fed in a horizontal state from the first corner plate and the second corner plate side to the third corner plate and the fourth corner plate by the conveyor. Then, the work collides with the positioning blocks of the third and fourth corner plates and stops. From this state, the reference first or second corner plate (or reference third or fourth corner plate) is advanced to a predetermined position, and the second or first corner plate (or fourth or third corner plate) is advanced. The workpiece is advanced to the first or second corner plate side of the reference (or the third or fourth corner plate side of the reference), and the workpiece is moved in the direction perpendicular to the loading direction. Pressing on the first or second corner plate side (or the third or fourth corner plate side of the reference),
The two corners of the work are held between the positioning block of the first corner plate and the positioning block of the second corner plate (or the positioning block of the third corner plate and the positioning block of the fourth corner plate). . Then, the third corner plate and the fourth corner plate (or the first corner plate and the second corner plate) are connected to the reference first or second corner plate side (or the reference third or fourth corner plate). (The corner plate side), and presses the work toward the reference first or second corner plate side (or the reference third or fourth corner plate side), and as a whole, the positioning block of the four corner plates is The work is positioned with reference to the first or second corner plate (or the third or fourth corner plate) in a state where the work is in contact with the four corners of the work.

G. Embodiment FIG. 1 and its main parts showing a schematic structure of an embodiment in which a work positioning device according to the present invention is applied to positioning of a top plate constituting a frame of a switchboard shown in FIGS. 4 and 5. As shown in FIG. 2 and FIG. 3 showing its appearance, the work 11 is transferred from its stock position A to the work transfer conveyor 12 which can be turned, and the work positioning in standby at the work transfer position B is performed. The robot is fed onto the device 13 and is further articulated at the workpiece processing position C.
After a predetermined welding operation has been performed by 14, the work is transferred again from the work transfer position B to the work transfer position D by the work transfer conveyor 12.

The work transfer conveyor 12 has an indexable and turnable structure so that the work 11 can be transferred between the stock position A, the work transfer position B, and the work unloading position D. At the position D, a work table (not shown) for placing the work 11 is provided.

A slide table 16 that reciprocates between the work transfer position B and the work processing position C by a driving unit (not shown) is provided on a bed 15 provided between the work transfer position B and the work processing position C. A guide rail 17 for guiding is formed, and the work positioning device 13 of the present invention is provided on the slide table 16. That is,
In FIG. 2, a reference corner plate for supporting the lower right corner of the work 11 in FIG.
The reference corner plate 18 can reciprocate in the left-right direction in FIG. 2 by a fluid pressure cylinder 20 with respect to a corner plate base 19 fixed on the slide table 16. On the reference corner plate 18, a pair of reference positioning blocks 21a and 21b abutting on the lower right corner of the work 11 in FIG. 2 is provided with a corner plate 22 for supporting the lower left corner of the work 11 in FIG. The fixed corner plate base 23 can reciprocate in the left-right direction (the direction facing the reference corner plate 18) in FIG. In FIG. 2, a pair of positioning blocks 25a and 25b abutting on the lower right corner of the work 11 are provided on the corner plate 22 so as to project at right angles to each other. The position of the positioning block 25a is set so as to be located on the same plane as the reference positioning block 21a. Further, corner plates 26 and 27 are provided at the upper left and right corners of the work table 16 in FIG. 2 to support the upper left and right two corners of the work 11 in FIG. I have. These corner plates 26, 27 are cross-rails 32, 33 reciprocating in the left-right direction in FIG. 2 by hydraulic cylinders 30, 31 with respect to corner plate bases 28, 29 fixed on the slide table 16, respectively. 2 and can be reciprocated in the vertical direction in FIG. Then, on the corner plate 26 located diagonally to the reference corner plate 18, the second
In the figure, a pair of positioning blocks 36a, 36b abutting on the upper left corner of the work 11 are provided so as to project at a right angle to each other. The positioning block 36b is positioned so as to be parallel to the reference positioning block 21b. On the other hand, a pair of positioning blocks 37a, 37b that abut on the upper right corner of the work 11 in FIG. However, the positioning block 37a is parallel to the reference positioning block 21a,
The positioning blocks 37b are positioned so as to be in parallel with the reference positioning block 21b.

In this embodiment, the left corner plate bases 23 and 28 in FIG.
On the other hand, it is installed on an adjustment table 38 which can be moved left and right in the figure. The corner plate base 29 is also movable on the slide table 16 in the direction opposite to the reference corner plate 18 (the vertical direction in FIG. 2). It is movable on the adjustment table 38 in the direction facing the corner plate 22 (the vertical direction in FIG. 2). The working fluid pressure of the fluid pressure cylinder 20 is set higher than the working fluid pressures of the other fluid pressure cylinders 24, 30, 31, 34, and 35, based on the stroke end position of the reference corner plate 18 on the corner plate 22 side. In FIG. 2, the lower right corner of the work 11 is always positioned at a fixed position on the slide table 16.

In the actual work, first, the position of the adjustment table 38 with respect to the slide table 16 is adjusted according to the size of the work 11, and the position of the corner plate base 29 with respect to the reference corner plate 18 and the corner plate base 28 with respect to the corner plate 22 are adjusted. Adjust the position of each.

Thereafter, the workpiece transfer conveyor 12 is rotated clockwise by 90 degrees from the state shown in FIG. 1, the work 11 at the stock position A is loaded onto the workpiece transfer conveyor 12, and the workpiece transfer conveyor 12 is then moved to the left. The work 11 is turned around 90 degrees and is sent to the work positioning device 13 which is waiting at the work receiving position B. At this time, the reference corner plate 18
1 is retracted rightward in FIG. 1 by the fluid pressure cylinder 20, and similarly, the corner plate 22 is retracted leftward in FIG. 1 by the fluid pressure cylinder 24. The corner plates 26, 27 are also in the retracted state by the hydraulic cylinders 30, 31, 34, 35, respectively.
When the work 11 is sent from the work transfer conveyor 12 to the work transfer position B, the work 11 comes into contact with the positioning blocks 36a and 37a and stops. In this state, the fluid pressure cylinder 20 is operated, and the reference corner plate 18 is moved forward on the side of the corner plate 22 in a state where the workpiece 11 is in contact with the reference positioning block 21b. Next, the fluid pressure cylinder 24 is operated to advance the corner plate 22 toward the reference corner plate 18 so that the work 11 is sandwiched between the positioning block 25b and the reference positioning block 21b. At this time, since the force of the fluid pressure cylinder 24 is weaker than the force of the fluid pressure cylinder 20 on the reference corner plate 18 side, the work 11 is positioned at the stroke end position of the fluid pressure cylinder 20. Further, the remaining fluid pressure cylinders 30, 31, 34, and 35 are all operated, and the work 11 is brought into contact with the positioning blocks 36a, 36b, 37a, and 37b while the work 11 is in contact with the reference positioning blocks 21a, 21b.
The work 11 is pressed to the side.

In this state, the slide table 16 operates to move to the work processing position C, and the welding robot performs welding of the corner pieces 39 temporarily fixed to the four corners of the work 11 and welding of the studs 40 and the like.
14 do automatically.

When the processing on the work 11 is completed, the slide table 16 returns to the work transfer position B again, and all the hydraulic cylinders 20, 24, 30, 31, 34, and 35 are operated again to operate the reference corner plate 18 and the corner plate. Retreat 22,26,27. Then, after delivering the processed workpiece 11 to the workpiece delivery conveyor 12, the workpiece delivery conveyor 12 turns 90 degrees counterclockwise in FIG. 1 to carry out the processed workpiece 11 to the workpiece delivery position D. Next, the workpiece transfer conveyor 12 is 18
Unprocessed work 11 rotating at 0 degree and waiting at stock position A
Is received again and the next work is started.

H. Effects of the Invention According to the work positioning device of the present invention, the work is positioned with reference to one of the four corners of the rectangular plate-shaped work carried by the conveyor. It is possible to always keep the work origin constant until the subsequent process even if the dimension changes, and it is possible to carry out total automation, which is very advantageous when automation of various works is intended. Further, since the structure of the device itself is simple, the device can be highly reliable.

[Brief description of the drawings]

FIG. 1 is a layout view of an embodiment of a work positioning device according to the present invention, FIG. 2 is a plan view of a main part thereof, FIG. 3 is a perspective view showing a state where the work is positioned, and FIG. FIG. 5 is an enlarged cross-sectional view of a portion viewed from the arrow V in FIG. Also, reference numerals 11 in the figure indicate a work, 13 is a work positioning device, 16 is a slide table, 18 is a reference corner plate, 19, 23, 28, 2
9 is a corner plate base, 20, 24, 30, 31, 34 and 35 are hydraulic cylinders,
21a, 21b are reference positioning blocks, 25a, 25b, 36a, 36b, 37
a and 37b are positioning blocks, 32 and 33 are cross rails, 38 is an adjustment table, 39 is a corner piece, and 40 is a stud.

Claims (1)

(57) [Claims] 1. A first corner plate having a pair of positioning blocks projecting from a first corner of a rectangular plate-shaped work, and a second corner adjacent to the first corner of the work. And a second corner plate protruding a pair of positioning blocks respectively abutting on the corners of the workpiece, and a third corner located diagonally to the first corner of the work and adjacent to the second corner. A third corner plate protruding a pair of positioning blocks respectively abutting on the corners, and a pair of abutments respectively abutting on a fourth corner adjacent to the first and third corners of the work. A fourth corner plate provided with a positioning block protruding therefrom, wherein the four corner portions of the work are held by the four corner plates, the work positioning device, wherein the first corner plate and the second From the first corner plate and the second corner plate side by the conveyor provided on the side of the corner plate. The work is carried in toward the third corner plate and the fourth corner plate, and the first or second corner plate is used as a reference corner plate for positioning, and the first or second reference plate is used as a reference. The corner plate is fixed at a fixed position and is provided so as to be retractable in a direction perpendicular to the carrying direction when the work is carried in by the conveyor, and the second or first corner plate is a reference The retreating movement is performed in a direction parallel to the movement direction of the first or second corner plate, or the pressing work of the work is provided to be able to move the work toward the reference first or second corner plate side. The corner plate and the fourth corner plate are respectively retracted and moved in two directions, a direction parallel to the direction in which the work is carried in and a direction perpendicular thereto, or reversely to the reference first or second corner plate side. The third or fourth corner plate is provided so as to be capable of pressing the workpiece; A reference corner plate for positioning, the third or fourth corner plate of this reference is fixed at a fixed position and can be retracted and moved in a direction perpendicular to the carrying direction when the work is carried by the conveyor. The fourth or third corner plate is retracted in a direction parallel to the moving direction of the reference third or fourth corner plate, or the reference third or fourth corner plate is reversed. The first corner plate and the second corner plate are respectively retracted and moved in two directions, a direction parallel to a direction in which the work is carried in and a direction perpendicular to the direction. Conversely, the work positioning device is provided so as to be able to press and move the work toward the reference third or fourth corner plate.