JPS6330189B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underbody conveying device for assembling an automobile body.

As is well known, today, the bodies of mass-produced passenger cars and the like are assembled by welding each element, such as the underbody, cab sides, roof, bonnet, and trunk lid. Generally, each element is assembled by further welding several parts, and the underbody is also usually assembled into a front body,
It is assembled from three parts: the front floor and rear floor.

The above front body, front floor, and rear floor are further assembled on each subassembly welding line, and each part assembled on each subassembly welding line is transferred to the underbody welding line (generally a tack welding line and an additional welding line). The parts are then transported to the underbody welding line, where each part is welded to complete the underbody.

Therefore, a transport device is provided to transport each part assembled in each subassembly welding line to an underbody tack welding line, and to transport the underbody tacked in the underbody tack welding line to an underbody multi-stroke welding line. A conveyance device is required, but in the past, a conveyance device for each component and a conveyance device for the underbody were each independently provided, making the conveyance system around the underbody assembly line extremely complicated.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an underbody conveyance device that can simplify the conveyance system around the underbody assembly line.

The underbody conveyance device for vehicle body assembly of the present invention includes an underbody carry-out section of an underbody tack welding line, the entire underbody multi-stroke welding line, a parts carry-out section of a subassembly welding line for welding underbody component parts, and an underbody tack welding line. It consists of a trolley circulation rail formed in a closed loop that passes through the parts loading section of the line, and a trolley hanger equipped with a pair of right and left openable/closable hooks spaced apart from each other on both sides of the underbody for hanging both sides of the underbody. Hang the underbody on the trolley hanger at the section,
After transporting the underbody through the entire area of the underbody multi-stroke welding line and unloading the welded underbody to the unloading section, the components are placed in either the front hook part or the rear hook part of the hooks at the parts unloading part. The parts are conveyed to the parts loading section by hitting the parts.

As described above, if the underbody and the components of the underbody are transported by one common trolley hanger, a transport device dedicated to this component is not required, and the transport system is simplified.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the arrangement of an underbody conveying device in a vehicle body assembly according to an embodiment of the present invention. The rear floor line 1 for assembling the rear floor and the front floor line 2 for assembling the front floor are arranged side by side with each other. Trolley circulation rail 4 that also passes above the floor loading section 3a of attached line 3
has been erected. Then, a conveying device that connects this front body additional stroke and underbody tacking line 3, the underbody additional stroke line 5, the dog line 6 for combining the underbody and other body parts, and the front body tacking line 7,
The present invention is applied.

The trolley circulation rail 8 of the conveying device that connects the four lines 3, 5, 6, and 7 is connected to the front body additional line and underbody tacking line 3.
It passes above the front body entry section 3b of the dot line 6, branches into two systems in parallel within the underbody additional line 5, and then merges, passes above the underbody entry section 6a of the dog line 6, and then the front body tacking line 7. It is constructed so as to form a closed loop passing above the front body unloading section 7a.

A large number of trolley hangers 9 (only one is shown in FIG. 1) are suspended from this rail 8.
The trolley hanger 9 runs in the direction of the arrow attached to the rail 8 in the figure. Hereinafter, this trolley hanger 9, which together with the rail 8 constitutes a trolley conveyor, will be explained in detail.

FIG. 2 is a side view of the trolley hanger 9, and the trolley hanger 9 runs in the direction of arrow A. 3 and 4 are elevational views (front view and rear view) thereof. The trolley hanger 9 has a connecting member 10 extending in the front-rear direction at the top, and a frame member 1 is attached to the front and rear ends of the connecting member 10.
1 and 12 are fixed. Suspension members 13 and 14 are fixed to the upper part of the connecting member 10 at two places, front and rear, and rollers 15 and 14 are fixed to the suspension members 13 and 14, respectively.
16 is rotatably supported. These rollers 15 and 16 are mounted on the rail 8, and the trolley hanger 9 is suspended from the rail 8. A drive device 17 is connected to one of the rollers 15, and the roller 15 is rotationally driven by the drive device 17, so that the trolley hanger 9 travels in the direction of arrow A as described above.

Support members 18a and 18b are protruded from both sides of the front frame member 11, and these support members 1
8a and 18b have supporting members 19a and 19, respectively.
The hanger arm 20 extends vertically through b.
a, 20b are swingably supported around swing shafts 21a, 21b. Inwardly protruding hooks 22a, 22b are fixed to the lower ends of these hanger arms 20a, 20b.
On the other hand, support members 23a and 23b are also protruded from both sides of the rear frame member 12, and each of these support members 23a and 23b has a support member 24.
Hanger arms 25a, 25b extending vertically are supported swingably around swing shafts 26a, 26b via a, 24b. Inwardly protruding hooks 27a, 27b are fixed to the lower ends of these hanger arms 25a, 25b.

The front and rear hanger arms 20a, 25a on the right side in the running direction of the trolley hanger 9 are connected at the upper part by rods 28a, 29a, and therefore these two hanger arms 20a, 25a are integrally connected. It swings in the direction of arrow B. Similarly, the two hanger arms 20 on the left
b and 25b are also connected by rods 28b and 29b, and swing integrally in the direction of arrow C. Furthermore, the left and right lower rods 29a and 29b are connected to each other by the rod 31a, the link mechanism 32, and the rod 31.
b, and the hanger arms 20a, 2
5a and the hanger arms 20b, 25b swing symmetrically with respect to the center line l of the trolley hanger 9. Hanger arms 20a, 20b, 25
a, 25b has a rocking habit in which the lower part moves inward due to its own weight, but the rocking in this direction is prevented by the stoppers 30a, 3 fixed to the frame member 11.
0b, hooks 22a, 22b, 2
The inner positions of 7a and 27b are defined.

A pair of anti-sway arms 33 and 34 are arranged before and after the right rear hanger arm 25a.
Hereinafter, the anti-sway arms 33 and 34 will be explained with reference to FIG. 5, which is an enlarged view of this portion. Bases 35, 3 of each anti-sway arms 33, 34
6 are fixed members 37 and 38 and fixed member 3, respectively.
9 and 40, it is fixed to the frame member 12. The anti-sway arms 33 and 34 are rotatably supported by the bases 35 and 36 via support shafts 41 and 42, respectively.
Anti-sway springs 43 and 44 connecting the base parts 3 and 34 and the base parts 35 and 36 urge them to approach each other. By applying such a bias, the anti-sway arms 33 and 34 are
The underbody 45, which will be described later, is the trolley hanger 9.
When it is not hung on the base, it is closed to the position where it abuts the stoppers 46, 47 of the bases 35, 36 (the position indicated by the two-dot chain line in FIG. 5). Although not shown in the drawings, the anti-sway arms 33 and 34 are similarly provided at the front and rear of the hanger arm 25b on the left rear side.

The operation of the apparatus of this embodiment having the above configuration will be explained below. Rear floor assembled at rear floor line 1 shown in Figure 1 (not shown)
The front floors assembled on the front floor line 2 are respectively placed at predetermined positions on the unloading sections 1a and 2a of the lines 1 and 2. These rear floors and front floors are conveyed to the floor carrying-in section 3a of the front body extension and underbody tacking line 3 by a trolley hanger (not shown) that moves along the trolley circulation rail 4 in the direction of the arrow. are tack-welded to each other. The front bodies that have been temporarily attached on the front body temporary attachment line 7 and conveyed to the front body loading section 3b by the trolley hanger 9 (the conveyance of this front body will be described in detail later) are It is temporarily welded to the front floor.

The underbody 45 is formed by temporarily attaching the three parts of the front body, front floor, and rear floor (the three parts are 45F and 45F in FIG. 2, respectively).
45FF and 45R) are positioned and placed on a lifting device consisting of a known means such as a hydraulically operated lifting pin at the underbody unloading section 3c of the front body re-stroke and underbody tacking line 3. . When the empty trolley hanger 9 enters the underbody unloading section 3c where the underbody 45 is waiting below, the aforementioned rods 28a and 28b are moved to the stationary fork 48.
a, 48b (see Figure 3). These forks 48a and 48b are movable in the directions of arrows D and E in FIG. 3 by a drive device (not shown), and are moved toward each other when the rods 28a and 28b are engaged as described above. Ru. Therefore, the hanger arms 20a, 25a and the hanger arms 20b, 25b each have a swing axis 2.
1a, 26a and swing shafts 21b, 26b, the upper part swings inward, that is, the lower part moves outward. In this way, the right hooks 22a, 27a and the left hooks 22b, 27b
When the openings are opened outward, the above-mentioned lifting device is activated, and the underbody 45 is moved to the rear left and right support areas 4.
5a (both side edges of the rear floor part) and the front left and right support parts 45b (the lower surface of the damper mounting hole flange of the suspension tower 45c that supports the front suspension) are located slightly above the hooks 22a, 22b and the hooks 27a, 27b, respectively. It can be lifted up to. At this time, the anti-sway arms 33 and 34, which had been closed to the position shown by the two-dot chain line in FIG. When the lifting of the suspension tower 45c is stopped, the front and rear ends of the suspension tower 45c are clamped by the action of the anti-sway springs 43 and 44.

Next, under this condition, the forks 48a, 48b are driven away from each other. Then, hanger arms 20a, 25a and hanger arm 20b,
25b, the lower part thereof swings inwardly due to its own weight, and the hooks 22a, 22b are directly below the left and right support portions 45a, and the hooks 27a, 2
7b is positioned directly below the left and right support portions 45b. Here, when the lifting device is lowered,
The support portions 45a and 45b are provided with hooks 22a and 45b, respectively.
22b and hooks 27a, 27b (see FIG. 2).

The trolley hanger 9 on which the underbody 45 is hung approximately horizontally as described above is connected to the drive device 17.
The underbody 45 is conveyed to the underbody additional hit line 5 by the underbody 45. As shown in detail in FIG. 6, this underbody additional line 5 has two systems that are formed equally, and the underbody 45 that has been conveyed is routed either along the rail 8 that is branched into the two systems. The robot is sent to the welding robot group R ₁ (R ₂ ) of the system, and at the welding station corresponding to each welding robot, it is positioned slightly lifted from the trolley hanger 9, and is completely removed from the trolley hanger 9. Multi-stroke welding is carried out efficiently and efficiently.

The trolley hanger 9 hanging the underbody 45 on which the additional welding has been completed travels on the rail 8 which is rejoined, and conveys the underbody 45 to the underbody carrying-in section 6a of the dog line 6. Note that the stations indicated by symbols S _{1 and S 2 in} FIG. It's summery. Also, the parts indicated by symbols E ₁ and E ₂ are
A rail 8 that connects to a dog line 6 installed on a higher floor than the underbody additional line 5;
This is an elevator section for connecting the low rail 8 passing through the underbody additional stroke line 5, and the rails 8 of the elevator sections _E1 and _E2 are moved up and down as appropriate. Note that in FIG. 6, a portion of the underbody 45 suspended from the trolley hanger 9 is omitted.

The underbody 4 is placed in the loading section 6a of the dog line 6.
Trolley hanger 9 with the underbody 45 unloaded by opening the hanger arms 20a, 20b and 25a, 25b at the loading section 6a.
Next, the process proceeds to the front body unloading section 7a of the front body tacking line 7. The front body 45, which has been temporarily attached, is placed in the front body unloading section 7a.
F is positioned and mounted on the lifting device (this front body is the part indicated by 45F in FIG. 2). In this unloading section 7a, the trolley hanger 9 has a rear pair of hanger arms 25.
a, 25b are located above the left and right suspension towers 45c of the front body 45F, that is, the relative positions with respect to the front body 45F are adjusted to the front body 4 when the underbody 45 is suspended.
It is stopped at the same relative position to 5F.
Then, the hanger arms 25a, 25b are operated in the same way as in the underbody carrying out section 3c described above, and the front body 4 is attached to the hooks 27a, 27b.
The support portion 45b of 5F is hung. At this time, the hanger arms 20a, 20b also move integrally with the hanger arms 25a, 25b, but of course nothing is hung on these hanger arms 20a, 20b.

As mentioned above, the front body 45F is hung from the hooks 27a and 27b at only two points on the left and right sides, but of course in this case, the anti-sway arms 33 and 34 are also holding the suspension tower 45c from the front and rear, so that the The front body 45F does not swing back and forth.

The trolley hanger 9 then advances to the front body loading section 3b of the front body reloading and underbody tacking line 3, and at this front body loading section 3b, the hanger arms 25a, 25b are opened, and the front body is moved to a predetermined position on the loading section 3b. Unload body 45F.

The trolley hanger 9, which has been completely empty by unloading the front body 45F, then advances to the underbody unloading section 3c, hangs the underbody 45 as described above, and transports the underbody 45.

As explained above, in the apparatus of this embodiment, one trolley hanger 9 is attached to the underbody 4.
5 and a front body 45F, which is one of the components of this underbody 45, can be transported. However, it is of course possible to form a trolley conveyor to convey underbody components other than the front body and the underbody by changing the shape of the trolley hanger and the route of the rails, and it is also possible to configure a trolley conveyor to convey underbody components other than the front body. In any case, since there is no need for a dedicated conveyance means for the underbody components, the conveyance system around the underbody assembly line is simplified.

In the above embodiment, the trolley hanger 9 is equipped with a drive device 17 so as to be self-propelled; It may be something that is driven.

As explained in detail above, the underbody conveyance device for vehicle body assembly of the present invention makes it possible to omit one conveyance means exclusively for underbody components, and this device reduces equipment costs for underbody assembly equipment. , space saving can be achieved.

[Brief explanation of drawings]

Fig. 1 is a layout diagram showing the arrangement of one embodiment of the present invention, Fig. 2 is a side view showing the trolley hanger in the embodiment of Fig. 1, and Figs. 3 and 4 are elevational views (front view). FIG. 5 is a partially cutaway side view showing an enlarged part of the trolley hanger, and FIG. 6 is a perspective view showing an enlarged part of the welding line in the embodiment of FIG. 1. be. 3...Front body additional stroke and underbody tacking line, 3b...Front body loading section, 3
c... Underbody carrying-out section, 5... Underbody additional line, 6a... Underbody carrying-in section of dotted line, 7... Front body tacking line, 7
a... Front body unloading section, 8... Trolley circulation rail, 9... Trolley hanger, 15, 16
...Roller, 17...Drive device, 22a, 22
b, 27a, 27b... hook, 28a, 28b
... Rod, 33, 34 ... Anti-sway arm, 4
5...Underbody, 45F...Front body, 45a, 45b...Support part, 48a, 48
b...Fork.

Claims (1)

[Claims] 1 Closed loop that passes through the underbody carry-out section of the underbody tack welding line, the entire underbody multi-stroke welding line, the parts carry-out section of the subassembly welding line that welds underbody components, and the parts carry-in section of the underbody tack welding line. The trolley hanger is comprised of a formed trolley circulation rail and a trolley hanger having a pair of right and left openable/closable hook parts spaced apart in the front and back for hanging both side parts of the underbody, and the underbody is hung on the trolley hanger at the underbody carrying out part. , conveyed through the entire underbody multi-stroke welding line,
After lowering the welded underbody to the unloading section, the component is hung from either the front hook section or the rear hook of the hook sections at the component unloading section, and the component is transferred to the component loading section. An underbody transport device used in vehicle body assembly.