JPH05185966A - Welding assembly carrier device - Google Patents

Abstract

PURPOSE:To easily increase various kinds of stages by carrying out welding assembly while a work to be welded on a jig truck carried into a carrier in stage reaches an upper carrier stage through a welding assebly stage by a truck lifting device, and while it further reaches the carrier out stage through the welding assembly stage by a truck lowering device. CONSTITUTION:A work (w) to be welded that is carrier to a carrier in stage 2 provided in opposition to a carrier out stage 5, between which an assembly line is provided, is put on a jig truck 8, and the work is lifted to reach an upper carrier stage 4 from the carrier in stage 2 through a welding assembly stage 3 arranged above the stage 2 by a jig vehicle lifting device 6, while welding/assembly is carried out by welding robots 10 arranged on the carrier in stage 2 and the welding assembly stage 3. Welding and assembly are carrier out by the welding robots 10 at each stage from the upper carrier stage 4 through the welding assembly stage 3 to the carrier out stage 5 while being lowered by a jig vehicle lowering device 7, and the work is thus lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding and assembling / conveying device in an assembling line for sequentially conveying an object to be welded to each welding stage and performing welding assembly on the object to be welded.

[0002]

2. Description of the Related Art For example, in a conventional automobile production process, a front wheel apron,
Toe boards, front floors, rear floors, rear wheel aprons, and other panels are welded together to assemble a center structure, and front pillars, rear quarters, and other panels are welded together to assemble side structures.

An assembly line for assembling such objects to be welded is composed of a tacking line and an additional line as disclosed in Japanese Patent Laid-Open No. 61-21859. The tacking line is composed of a carry-in stage and a carry-out stage, and a tacking line arranged between the carry-in stage and the carry-out stage. The boosting line is composed of a carry-in stage and a carry-out stage, and a boosting stage arranged between the carry-in stage and the carry-out stage, and the carry-in stage is connected to the carry-out stage of the temporary attachment line. The additional line receives the center structure and the like from the temporary attachment line, performs the necessary additional line, and completes the assembly work.

[0004]

In the above-mentioned assembly line, when there is a change or addition of a work piece to be weld-assembled due to a change in the design of an automobile, or a different mixed work piece is newly produced by mixed flow production. In this case, it is difficult to add a new stage because various stages are already arranged. Even if addition is possible, since the stages are adjacent to each other, the welding posture of the welding apparatus such as a welding robot is limited, and there is a problem that the welding apparatus cannot be used effectively.

Therefore, the object of the present invention is to easily cope with a change or addition of a work piece to be weld-assembled even if there is an existing assembly line, or a mixed flow production of a new work piece to be welded. An object of the present invention is to provide a welding assembling / conveying device capable of effectively utilizing the device.

[0006]

A welding assembly conveying apparatus according to the present invention which achieves the above object, sequentially conveys an object to be welded placed on a jig carriage to each welding stage and sequentially assembles and welds the object to be welded. In the welding assembly conveying device in the assembly line for carrying out welding, the carrying stage where the jig carriage carrying the object to be welded is carried to a predetermined position and the object to be welded is placed. A carry-out stage for carrying out the jig carriage, a welding assembly stage arranged on each of the carry-in stage and the carry-out stage for welding and assembling an object to be welded by a welding device, and a welding assembly arranged above the carry-in stage. Welding and assembling the upper transport stage that transports the jig carriage with the workpiece to be welded to the welding assembly stage, which is located above the carry-out stage, and the jig carriage that has been loaded into the carry-in stage. A jig carriage rises apparatus allowed to rise to the upper transfer stage through the stage, and has a jig carriage descends device operated to lower the upper transfer stage a jig trolley until unloading stage through the welding assembly stage.

[0007]

[Operation] While the object to be welded to the loading stage by the jig cart is placed on the jig cart, the jig cart lifting device together with the jig cart sequentially moves from the loading stage to the welding assembly stage to the upper transport stage. The welding apparatus is provided to raise the assembly while performing welding assembly, and then the jig carriage is conveyed to a position above the welding assembly stage above the carry-out stage by the upper conveyance stage. Then, the jig carriage lowering device descends the jig carriage while welding and assembling the work to be welded by the welding robots arranged on each stage from the upper conveying stage to the welding assembly stage to the carry-out stage. The jig cart, and hence the object to be welded, is carried out.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a welding assembly conveying device according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a welding / assembling and conveying apparatus 1 installed in an assembly line of an automobile manufacturing factory or the like. The main parts of the welding assembly / transportation device 1 are a unitized loading stage 2, welding assembly stage 3, upper transporting stage 4, unloading stage 5, jig carriage raising device 6, and jig carriage lowering device 7.
It is composed by.

On the other hand, the jig carriage 8 on which the object to be welded w is placed has a gauge pin 8g for positioning the object to be welded w on the carriage 8a, a positioning regulation plate 8b, and a positioning regulation plate 8b as shown in the side view of FIG. A clamp device 8c for clamping and unclamping the workpiece w positioned by is provided, and the gauge pin 8g, the regulating plate 8b, and the clamp device 8 are provided.
c is adapted to be applied to a plurality of vehicle types and can be retracted from the carriage 8a by the cylinder piston device 8d from the viewpoint of welding work. The transportation base 9 for positioning and mounting the jig carriage 8 at a predetermined position is substantially plate-shaped and provided with a lock device 9a for fixing the jig carriage 8.

The carry-in stage 2 is arranged so as to face the carry-out stage 5 with a predetermined position La provided on the main line L of the assembly line interposed therebetween, and as shown in FIG.
c has a substantially cubic machine frame 2a, and a recess 2d is formed in the center floor of the machine frame 2a.

A support base 2e for supporting the transport base 9 is provided in the recess 2d, and the predetermined position L of the main line L is provided.
The jig carriage 8 at a is configured to be carried in on the transportation base 9 placed on the support base 2e. The jig carriage 8 carried on the transportation base 9 is carried into a predetermined position by the lock device 9a, and accordingly, the object w to be welded placed on the jig carriage 8 is carried into a predetermined position.

Further, the carry-in stage 2 is provided with a welding device such as a plurality of welding robots 10 for welding and assembling the object to be welded w that has been carried in based on preset working conditions.

Like the carry-in stage 2, the carry-out stage 5 provided so as to face the carry-in stage 2 has a substantially cubic machine frame 5a consisting of columns 5b and beams 5c, as shown in FIG. A recess 5d is formed in the central floor of 5a, and a support 5e for supporting the transportation base 9 on which the jig carriage 8 is mounted is provided in the recess 5d. By releasing the lock device 9a provided on the transportation base 9, the jig carriage 8
Therefore, the object w to be welded placed on the jig carriage 8 can be carried out to the predetermined position La of the main line L.

Further, in the carry-out stage 5, as in the carry-in stage 2, a plurality of welding devices are provided for performing welding and assembling work such as additional punching on the workpiece w located in the carry-out stage 5 based on preset conditions. A welding robot 10 is provided.

Above the carry-in stage 2 and the carry-out stage 5, a welding assembly stage 3 is stacked and constructed.
The welding assembly stage 3 has a machine frame 3a formed in a substantially cubic shape by columns 3b and beams 3c, and the machine frame 3a will be described later with a jig carriage 8 and an object to be welded w mounted on a transport base 9. The upper and lower parts are opened so as to be able to ascend and descend by the jig cart raising device 6 or the jig cart lowering device 7.

At the predetermined height position of the pillar 3b of the welding assembly stage 3, when the carriage base 9, and hence the jig carriage 8 reaches the predetermined height position by the jig carriage raising device 6 or the jig carriage lowering device 7. As shown in FIG. 4, a top portion 13b is projected by the cylinder piston device 13a so that the transportation base 9
There is provided a carriage positioning device 13 that engages with a locking portion 9b provided on the carriage base 9 to perform the height positioning function of the transportation base 9, and a fall prevention device 14 that prevents the transportation base 9 and the like from falling. It should be noted that the fall prevention device 1 is attached to the carriage positioning device 13.
The function of 4 may be added.

Further, the welding assembly stage 3 is provided with a plurality of welding robots 10 as welding devices for performing welding assembly work on the workpiece w whose height is positioned by the carriage positioning device 13. The welding assembly stage 3 configured as described above is unitized so that a suitable number of pieces can be stacked and assembled or disassembled in accordance with the content of the welding assembly work of the workpiece w.

An upper transfer stage 4 is laid horizontally between the welding assembly stage 3 which is constructed on the carry-in stage 2 and the carry-out stage 5 and is arranged at the uppermost stage, and between the carry-in stage 2 and the upper transfer stage 4. A jig carriage device 6 and a jig carriage lowering device 7 for raising and lowering the jig carriage 8 mounted on the transport base 9 are provided between the upper transport stage 4 and the carry-out stage 5.

As shown in a model in FIG. 6, the jig cart raising device 6 has a drive gear that is rotationally driven by a drive device (not shown) on one of the upper transport stage 4 and the carry-in stage 2 and the other stage. A pair of gears 6a and 6b, which are driven gears, are arranged, a chain 6c installed between the gears 6a and 6b, and a locking piece 6d protruding from the chain 6c. It is lifted by engaging with the transport base 9 that has been loaded into the loading stage 2.

A carrying base 9 on which the jig carriage 8 lifted by the jig carriage raising device 6 is placed
The upper transport stage 4 for transporting from the welding assembly stage 3 located on the uppermost side to the carry-out stage 5 to the welding assembly stage 3 located on the uppermost side has a transport rail 4a installed above and a hanger on which the transport base 9 is placed. 4b is hung on this conveyance rail 4a. Further, the hanger 4b is a self-propelled type, and has drive wheels 4c driven by a traveling motor (not shown), and the drive wheels 4c travel on the transport rails 4a. In addition, the lift mechanism 4d causes the hanger 4b.
Can be moved up and down and opened and closed. With this configuration, the object w to be welded, which has been lifted up to the upper transfer stage 3 by the jig cart lifting device 6, is carried to the jig cart lowering device 7 while being placed on the carrying base 9 via the jig cart 8. can do.

As shown in FIG. 6, the jig cart lowering device 7 has the same structure as that of the jig cart raising device 6, and a drive gear and a driven gear are respectively arranged on one of the upper transport stage 4 and the carry-in stage 5. A chain 7c provided with a locking piece 7d is installed between the two gears 7a and 7b. With this configuration, by engaging the transport base 9 with the locking piece 7d, the workpiece w is placed on the transport base 9 through the jig carriage 8 from the upper transport stage 4 to the carry-out stage 5 via the welding assembly stage 3. It can be lowered to the carry-out stage 5 in the state of being placed.

The jig carriage 8 lowered to the carry-out stage 5 is placed on the support base 5e formed on the central floor of the carry-out stage 5 via the carrying base 9, and the lock device 9 is installed.
It is configured such that a is released and the jig carriage 8 and hence the object to be welded w is carried out to the predetermined position La of the main line.

In FIG. 5, reference numeral 8e is automatically connected to a power source (not shown) provided on the welding assembly stage 3 to operate the cylinder piston device 8d to prevent the welding operation of the welding robot 10. Restriction plate 8b
It is a connection terminal for retracting and retracting the clamp device 8c.

According to the welding assembling / conveying apparatus having the above-mentioned structure, the object to be carried in while being mounted on the jig carriage 8 to the carrying-in stage 2 provided opposite to the carrying-out stage 5 with the assembly line interposed therebetween. The welding object w is transferred by the jig robot lifting device 6 from the loading stage 2 through the welding assembly stage 3 disposed above the loading stage 2 to the upper transportation stage 4 by the welding robots 10 disposed in 2 and 3, respectively. It is raised while welding and assembly is performed. Further, the jig robot lowering device 7 performs welding and assembling by the welding robot 10 on each stage from the upper transfer stage 4 to the carry-out stage 5 through the welding / assembling stage 3 and lowers them. Therefore, an assembly line is formed as shown in FIG. 7 in which the object w to be conveyed is conveyed, and even if there is no space in the flow direction A of the line, it is possible to add more easily.

In the above embodiment, the case where the carry-in stage 2 and the carry-out stage 5 are arranged to face each other across the main line L has been described, but the carry-in stage 2 and the carry-out stage 5 are arranged in line along the main line L. It is possible to cope with the case where the space in the width direction of the main line is limited by providing a welding assembly conveying device for conveying the object to be welded as shown in FIG. Further, when there is a height limit on the existing line, the conveyance direction of the workpiece w is set as shown in FIG.
After moving to the side once from the existing line as shown in,
It can be configured to be raised, and the carrying direction can be appropriately changed depending on other conditions of the existing assembly line.

Further, the jig carriage 8 may be configured to be directly transported without being placed on the transport base 9 or a welding device may be appropriately provided only on a necessary stage. The device and the jig lowering device may be configured by a pinion that is provided on a rack and a jig carriage that extend in the vertical direction along the welding and assembling / conveying device, and that is engaged with the rack and driven to rotate. Further, it is also possible to invert and control the posture of the object to be welded placed on the jig carriage while being appropriately conveyed between the stages. Further, the welding robot provided on the stage can be configured to perform welding and assembly on an object to be welded placed on a jig carriage located on another stage, so that the welding robot can be used more effectively.

The welding assembling / transporting apparatus according to the present invention described above can be used not only on an existing assembly line, but also when a new assembly line is newly installed, the space can be effectively used, and in various industries other than the automobile industry. It can also be used as a welding assembly transfer device.

[0029]

According to the welding / assembling and conveying apparatus according to the present invention described above, the objects to be welded carried into the carry-in stage by the jig carriage are successively conveyed from the carry-in stage through the welding / assembling stage by the carriage raising apparatus to the upper carrying stage. The welding assembly is performed on the stage while being transported from the upper transport stage through the welding assembly stage to the carry-out stage by the trolley lowering device, resulting in a reduction in installation space and a new installation line on the existing assembly line. Various stages can be easily added. Further, the welding equipment such as a welding robot is not restricted in the welding posture at each stage, and the welding equipment can be fully utilized effectively, and by adding each stage as a unit, it is possible to easily add and change. Have the effect of.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of a welding assembly device according to the present invention.

FIG. 2 is an enlarged explanatory view of a II portion in FIG.

FIG. 3 is an enlarged explanatory view of a part III in FIG.

FIG. 4 is an explanatory view of a trolley positioning device according to the present embodiment.

FIG. 5 is an explanatory view of a jig carriage according to the present embodiment.

FIG. 6 is an explanatory diagram of a jig cart raising device and a jig cart lowering device according to the present embodiment.

FIG. 7 is an explanatory view showing the carrying direction of the jig carriage in this embodiment as well.

FIG. 8 is an explanatory view showing a carrying direction of a jig carriage in another embodiment of the welding and assembling apparatus according to the present invention.

FIG. 9 is an explanatory view showing a carrying direction in still another embodiment of the welding and assembling apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding assembly conveying device 2 Carrying in stage 3 Welding assembling stage 4 Upper conveying stage 5 Unloading stage 6 Jig truck raising device 7 Jig truck lowering device 8 Jig truck 9 Transport base 10 Welding robot (welding device) w Welding object

Claims (8)

[Claims] 1. A welding assembly transfer device in an assembly line for sequentially transferring the objects to be welded placed on a jig carriage to each welding stage and sequentially performing welding assembly on the objects to be welded. A carry-in stage in which the jig carriage carrying the object is carried into a predetermined position, a carry-out stage carrying out the jig carriage carrying the welded object to be welded, and a carry-in stage and carry-out stage. Each of the welding assembly stages, each of which is used for welding and assembling an object to be welded by a welding device, and the welding assembly stage arranged above the carry-in stage to the welding assembly stage arranged above the carry-out stage An upper transfer stage for transferring the jig dolly on which the jig is mounted, and a jig trolley lifting device for lifting the jig trolley carried into the carry-in stage to the upper transfer stage via the welding assembly stage, A jig trolley lowering device for lowering a jig trolley from an upper transport stage to a carry-out stage via the welding assemble stage, and a welding assemble / transport device. 2. The welding assembling / conveying apparatus according to claim 1, wherein the jig carriage is placed on a conveying base and conveyed to each stage. 3. The welding / assembling and conveying apparatus according to claim 1 or 2, wherein a welding device for welding and assembling an object to be welded is provided in at least one of the carry-in stage, the carry-out stage and the upper conveying stage. 4. The welding assembly conveying device according to claim 1, wherein a plurality of welding assembly stages are arranged on the carry-in stage and the carry-out stage, respectively. 5. Each stage is unitized,
5. It is possible to assemble and disassemble each other.
The welding assembly and conveyance device according to one of the above. 6. The welding assembly conveying device according to claim 1, wherein a jig cart drop prevention device is provided on the welding assembly stage. 7. The welding assembly conveying device according to claim 1, wherein the posture of the welded object is controlled when the welded object is conveyed. 8. A welding robot provided on a stage is a welding robot capable of performing a welding assembly on an object to be welded placed on a jig carriage located on another stage. The welding assembly transport device described.