JPS6327905Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a welding device, and more specifically, to a welding device that brings a workpiece to a welding position and welds it with a welding robot.

Conventionally, such welding equipment was used, for example, in Automotive Engineering Complete Book Volume 19 "Automobile Manufacturing Method" (1972).
There are some that are shown in sections 7, 3, and 4 of ``Industrial Robots'' (pages 173 to 178) of Sankaido, April 20, 2016).

Here, a device similar to that is shown in FIG.
In the figure, 1 is a floor surface, and a pit 2 is dug in this floor surface 1. A frame 3 is attached to the bottom of the pit 2, and a vertical cylinder 4 is fixed to the frame 3. A lifter stand 6 is attached to the tip of the piston rod 5 of the cylinder 4, and the lifter stand 4 is moved up and down by the operation of the cylinder 4. A plurality of brackets 7 are fixed to the upper surface of the lifter stand 6, and a bent portion of a substantially L-shaped fixture 8 is rotatably connected to each bracket 7. At both ends of the fixture 8, receiving surfaces 10 and 11 are formed, respectively, for receiving a workpiece 9, such as the floor of an automobile, from below. These receiving surfaces 10 and 11 are used for different works 9, for example, the floors of cars F and G,
It supports A cylinder 12 is rotatably connected to the bracket 7, and the fixture 8 is rotatably connected to the tip of a piston rod 13 of the cylinder 12. As a result, when the cylinder 12 is actuated, the receiving surfaces 10 and 11 of the fixture 8 are switched by the rotation of the fixture 8. 14 is a transfer bar, and this transfer bar 14 is a first
In the figure, it extends perpendicularly to the plane of the paper and can reciprocate in the direction of its extension. A receiver 15 for supporting the workpiece 9 from below is attached to the transfer bar 14.
The workpiece 9 supported by the transfer bar 1
By the reciprocating movement of 4, it is transferred to just above the lifter stand 6. 16 is a welding robot installed on the floor 1 on the side of the transfer bar 14;
This welding robot 16 has a welding gun 17 for welding the workpiece 9. Such a welding device operates as follows. That is, when the workpiece 9 supported by the receiver 15 of the transfer bar 14 is transferred to just above the lifter stand 6, the cylinder 4 is actuated, the piston rod 5 protrudes, and the lifter stand 6 is raised. As a result, after the receiving surface 11 of the fixture 8 receives the workpiece 9, the workpiece 9 is further lifted and transferred to the welding position.
Next, the welding robot 16 operates, and the welding gun 17
As a result, predetermined portions of the workpiece 9 are welded. Next, when the cylinder 4 is operated and the lifter stand 6 is lowered, the workpiece 9 supported on the receiving surface 11 of the fixture 8 is transferred to the receiving surface 15 of the transfer bar 14, and then the reciprocating movement of the transfer bar 14 It is transferred to the next process. When the car type or model of the workpiece 9 is changed, the cylinder 12 is actuated to rotate the fixture 8 and the receiving surface 10 is changed to the changed workpiece 9.
move it to a receiving position where it can be received. In order to improve such a device that can transport two types of workpieces 9 and to be able to transport many different types of workpieces 9, it is necessary to install a fixture different from the fixture 8 on the lifter stand 6. or the shape of the fixture 8 is Y.
It is also conceivable to form a shape such as a cross shape or a cross shape and form a receiving surface at the outer end of the radiating end, but this would complicate the structure of the device and increase the number of failures. Because of the fixture, power loss increases. For this reason, there is a limit to the number of types of workpieces, and there is a problem in that it is not possible to transport too many types of workpieces.

This invention was made with attention to the above-mentioned problems, and aims to solve the above-mentioned problems by separating the fixture from the lifter table, setting a waiting position to the side of the lifter table and off the conveying line, providing a loading frame that can move between this waiting position and the lifting path of the lifter table, and placing the separated fixture on the loading frame.

An embodiment of this invention will be described below based on the drawings.

In FIG. 2, 21 is a floor surface, and a pit 22 is dug in this floor surface 21. Pitt 22
A frame 23 is attached to the bottom surface of the cylinder, and the rod side end of a vertical cylinder 24 is fixed to this frame 23. A lifter stand 26 is attached to the tip of the piston rod 25 of the cylinder 24, and a plurality of positioning pins 27 are erected on the upper surface of the lifter stand 26. As a result, when the cylinder 24 operates, the lifter stand 26 moves up and down between the raised position (top dead center) A shown by the solid line in FIG. 2 and the lowered position (bottom dead center) B shown by the imaginary line. . Legs 28 are erected on both sides of the frame 23 at the bottom of the pit 22, and both ends of a horizontal guide rail 29 are connected to these legs, respectively. Stoppers 30 and 31 are fixed to the upper surface of both ends of the guide rail 29, respectively. Reference numeral 32 denotes a running platform as a mounting frame. A plurality of brackets 33 are attached to the lower surface of this running platform 32, and each bracket 33 rotatably supports a wheel 34 that rolls on a guide rail 29. There is. As a result, the carriage 32 can move horizontally on the guide rail 29 along the guide rail 29. The upper surface of the traveling base 32 is located above the upper surface of the lifter base 26 at the lowered position B. A horizontal cylinder 36 is attached to the guide rail 29 via a bracket 35, and the piston rod 3 of this cylinder 36
The tip of the bracket 7 is rotatably connected to a bracket 38 attached to the carriage 32. As a result,
By operating the cylinder 36, the traveling platform 32 moves along the guide rail 29 toward the lifter platform 26.
It reciprocates between the ascending path of 1 and a standby position, which will be described later. 39 is a clamp provided on the guide rail 29;
9; a clamp block 41 rotatably connected to the bracket 40; a cylinder 42 rotatably connected to the bracket 40;
1 and a piston rod 43 of a cylinder 42 rotatably connected to the piston rod 43 of the cylinder 42. and,
When the carriage 32 moves to the right in FIG. 2 and comes into contact with the stopper 31, the clamp block 41 presses the carriage 32 against the stopper 31, positioning and clamping the carriage 32. Reference numeral 44 designates a clamp for positioning and clamping the traveling base 32 against the stopper 30 when the traveling base 32 moves to the left in FIG. It is provided. In addition, this clamp 4
The configuration of the clamp 4 is similar to that of the clamp 39 described above. A plurality of positioning pins 45 and 46 are attached to the left upper surface and right upper surface of the traveling platform 32, respectively. 47 and 48 are lifter stands 26
a pair of fixtures 47, 48 separated from the flat base 49;
and a support post 51 that stands upright on the base 49 and has a receiving surface 50 formed at its upper end. The receiving surfaces 50 of each of the fixtures 47, 48 have different shapes so that they can receive different workpieces, for example, the floor of car F and the floor of car G. When these fixtures 47 and 48 are placed on the carriage 32,
Locating pins 45 and 46 are connected to the base 49, respectively.
It is positioned at a predetermined position by being inserted into. And the fixtures 47, 48
is lowered to position B by moving the traveling base 32.
The position is alternately switched between a lifting position C directly above the lifter stand 26 and a standby position D on both sides above the lifter stand 26. Reference numeral 52 denotes a transfer bar installed above the lifter stand 26 at the raised position A, and this transfer bar 52 extends in a direction perpendicular to the plane of the paper in FIG. . A finger 54 is attached to the transfer bar 52 to support a workpiece 53, such as the floor of an automobile, from below. Then, the workpiece 53 is transferred to just above the lifting position C by the transfer bar 52. Frames 55 are installed on both sides of the lifter stand 26 on the floor surface 21, and welding robots 56 in which sequences corresponding to the types of workpieces 53 are pre-installed are installed on each frame 55. This welding robot 56 has a welding gun 57 for welding the welding portion of the work 53.

Next, the operation of one embodiment of this invention will be explained.

First, the workpiece 53 of, for example, car F is transferred by the transfer bar 52 to just above the lifter stand 26 and stopped. At this time, the piston rod 25 of the cylinder 24 has been retracted to the bottom dead center, and the lifter stand 26 is located at the lowered position B. At this time, the carriage 32 moves to the right in FIG.
It is pressed against and clamped for positioning.
Then, it is placed on the traveling platform 32 and lifted to the position C.
The fixture 47 located at has a receiving surface 50 for the F car. Next, the cylinder 24 is actuated and the piston rod 25 protrudes. As a result, the lifter stand 26 rises, and when its upper surface abuts the lower surface of the base 49 of the fixture 47,
The fixture 47 is received from the traveling platform 32.
At this time, the positioning pin 27 is
The fixture 47 is inserted into the base 49 of the lifter table 26, and the fixture 47 is positioned with respect to the lifter stand 26.
When the piston rod 25 further protrudes in this state, the receiving surface 50 of the fixture 47 comes into contact with the workpiece 53. Thereby, the workpiece 53 is transferred from the transfer bar 52 to the fixture 47. In this state, add piston rod 2.
5 protrudes, the workpiece 53 is fixed to the fixture 4.
Welding position E while being supported from below by
It can even be lifted up. Next, the welding robot 56 welds the workpiece 53 brought to the welding position E using the welding gun 57 at the welding location. When this welding work is completed, the piston rod 25 is retracted and the workpiece 53 is transferred from the fixture 47 to the transfer bar 52. When the piston rod 25 is further retracted, the fixture 47
comes into contact with the traveling platform 32 and is delivered to the traveling platform 32. When the lifter stand 26 reaches the lowered position B, the piston rod 25 stops retracting. Next, the transfer bar 52 operates,
The workpiece 53 is transferred to the next process. The above is one cycle of transport and welding work, and the workpiece 53 is
In the case of a car, such operations are repeated one after another.

Next, when the workpiece 53 is switched from the F car to the G car, the cylinder 42 is operated to retract the piston rod 43 and the clamp block 4
Rotate 1 from the upright position to the inverted position. As a result, the clamp 39 no longer clamps the carriage 32. Next, actuate the cylinder 36 to make the piston rod 37 protrude, and the fixture 4
7 and 48 are placed on it, is moved to the left in FIG. 2 until it abuts against the stopper 30. Next, the clamp 44 is activated to press and clamp the carriage 32 against the stopper 30. As a result, the fixture 47 for car F is switched from the lifting position C to the standby position D, and the fixture 48 for car G is switched from the standby position D to the lifting position C. Next, the lifter stand 26 is raised and lowered in the same manner as described above, and the workpiece 53 of car G is welded. At this time, the fixture 48 is located at the lifting position C, so the fixture 48 is raised and lowered by the lifter stand 28.

Next, as shown in FIG. 2, when the fixture 47 for car F is located at lifting position C and the fixture 48 for car G is waiting at standby position B, for example, after a predetermined time, car H work 5
When 3 is scheduled to be sent,
During this transportation welding work for car F, the fixture 48 for car G is replaced with the fixture for car H. This replacement work is carried out by, for example, using a forklift or the like to move the fixture 48 for the G vehicle to the traveling platform 3.
2, the fixture for the H vehicle is transported and placed on the standby position D of the traveling base 32. At this time, the positioning pin 46 is inserted into the fixture for the H vehicle, and the fixture for the H vehicle is positioned and held on the traveling base 32.

In this way, the fixtures placed on the lifter stand 26 are only those that correspond to the workpieces currently being welded, so less power is required to move the lifter stand 26 up and down, which is extremely economical.

Furthermore, since the fixture located in the standby position can be replaced, if this replacement work is done while the fixture located in the lifting position is being worked on, three or more different types of workpieces can be replaced without stopping the line. Transport welding work can be performed, and the versatility of the device can be further improved.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a conventional welding device, and FIG. 2 is a schematic front view of an embodiment of this invention. 26... Lifter stand, 32... Mounting frame (traveling platform), 47... Fixture, 48... Fixture, 52... Transfer bar, 53...
Workpiece, 56... Robot, C... Lifting position, D... Standby position.

Claims (1)

[Scope of utility model registration request] A fixture is provided that can hold a workpiece flowing along a predetermined conveyance line, and a lifter table located on the conveyance line is raised, the fixture receives the workpiece on the way up, and then the workpiece is brought to the welding position, and the workpiece is welded. In a welding device that allows a robot placed at a certain position to perform welding work, the fixture is separated from the lifter stand, and a standby position is set on the side of the lifter stand and away from the conveyance line. A welding device characterized in that a mounting frame is provided that is movable between the position and the ascending path of the lifter stand, and the separated fixture is placed on the mounting frame.