SK5172000A3 - Transport system for welding devices - Google Patents

Abstract

The transport equipment has overhead transport tracks for bringing welding assemblies to and from the welding points. Crossw and between the overhead transport tracks (9,10) on both sides of a clamping device (1) for the welding assemblies are guide supports (4) on which a boom (5) can move. On both sides of the boom facing the transport tracks are vertically displaceable main slides, each with two opposing guide tracks. On each guide track of the main slides facing the transport tracks are vertically displaceable gripper slides (16). Betw the main slides on the boom, drive motors are installed for a main slide and its gripper slide.

Description

Technical field

The invention relates to a transport device for welding devices of a tubular structure for welding parts of car bodies, in particular floor parts, with suspended lines for feeding and withdrawing the welded parts.

BACKGROUND OF THE INVENTION

Known are gantry welding devices for floor parts of car bodies through which a conveyor track travels the floor panels from one workplace to another. Such a device is not covered by the invention (DE 3613956 A1 and DE 3506314C2). In addition, welding preparations are known for floor parts of car bodies with suspended conveyor tracks for supply and removal of floor parts. Both the treated and finished parts of the floors are handled by a separate lifting device moving on a guide beam across the suspended conveyor lines. Thus, separate lifting and chassis drives are required for each lifting device. A large number of lifting devices and the necessary drive for each of them represent high costs. Since the floor parts are suspended by C-hooks on the lifting device, this hampers the positioning and welding of the parts to be handled.

For conveying and weighing equipment, especially in presses, toothed belt drives are known for height-shifting tool carriers. Their drive motor is mounted on a stable part of the machine. The toothed belt passes through a plurality of guide rollers in the carriage and on the height-adjustable tool carriers and both ends are secured at the end of the conveyor track opposite the drive motor. In this solution, the travel distance has only a very small effect on the functional safety of the drive. In addition, no load from the drive motor is transmitted to the mobile tool carrier.

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SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the invention to improve the transport device for welded tubular structures of car body parts and to reduce the drawbacks of the prior art. In particular, the number of moving parts and their drives should be reduced and labor productivity increased. The object is solved according to the invention by the claims 1 and 4. The features of the subclaims are suitably arranged in claims 1 and 4.

On both sides of the boom are mounted main and grab carriages, forming one mobile unit, which for its horizontal movement on the guide beams has only one drive with NC control. This arrangement further enables the joint movement of the vertical displacement of each main and their grab carriage together. Joint drives of the main and grab carriages with toothed belts allow the forced movement of both carriages without the need for additional control. The combination of the drives of the main and the grab carriage with toothed belts results in a doubling of the operating speed of the grab carriage and thus an increase in labor productivity.

With the independent drive of the main slide, the two main slide can simultaneously move into their upper end positions, creating a free space for welding robots.

Overview of the figures in the drawing

In the figures, the invention is explained by way of example, showing: FIG. 1 shows a general view of the conveyor device, FIG. 2 shows a diagram of the drive of the main and grab carriage by toothed belts, FIG. 3 a device for balancing the weight of the main carriage with the grab carriage.

DETAILED DESCRIPTION OF THE INVENTION

On the floor of the production hall (Fig. 1) there are two columns 2, 3 on each side of the clamping device 1, at the upper ends of which there is a horizontal guide beam 4. The two portals so formed are arranged on both sides of the clamping device 1. longitudinally mounted mobile boom 5. Toothed belt drive 6 is provided by the NC drive

A pulley motor 7 is mounted on one end of the guide beam 4. At the other end, a deflection pulley 8 for the toothed belt 6 is mounted. On the sides of the boom 5, the free ends of the toothed belts 9, K) are mounted. It is preferable to locate the toothed belt drive 6 on each guide beam 4 when both drive motors 7 have a common NC control.

Above the columns 2, 3, two suspended conveyor tracks 9, 10 run under the roof of the production hall, rectangular to the beams 4, one of which feeds parts of the floors for processing and the other serves for the removal of finished parts. Both suspended tracks 9, 10 are clocked in the rhythm of the work of the welding device. Transport trolleys (Skid) H. or suspension equipment can be used to remove parts of the floors.

In the center of the boom 5, on each of the two sides there are guide bearings 12 for catching the vertical guide bars 13 (not shown) according to FIG. These are mounted on the frame 14 of the vertically movable main carriage 14.1 and have the same length as the frame. On the opposite sides of the frame, two other guide rails of the same length are mirrored, on which the movable grab carriage 16 is mounted vertically. On the sides of the guide rails, the grab carriage is provided with a downwardly realized arm Π, the free end of which is interchangeable Similarly, the main carriage 14.2 with the gripper carriage 16 is realized in a mirror-image to said main carriage 14.1 on the other side of the boom 5.

Between the guide bearings 12 mounted on the boom 5, there is 14.1 for each main slide. 14.2 with a gripper carriage 16 mounted on a boom a driving motor 19 (FIG. 2). It has an NC control and drives a timing belt pulley 20 on which the timing belt 21 runs. This is guided via two boom-mounted idler pulleys 22 with one end at the upper edge of the frame 14 of the main carriage 141 and the other end at the lower edge of the frame. fixed. A further toothed belt 20 is guided through a mirror-driven drive motor 19 and guide rollers 22 on the opposite side of the boom 5 and there is connected in a prescribed manner to the frame 14 of the other main carriages 14.2. For the drive of the grab carriage 16, freely rotatable pulleys 23 are mounted on the upper and lower edges of the main carriage 23. Each of these pulleys is provided with an open belt 24, one end of which is fixed to a boom and the other end to the upper or lower. The length of the belts 24, 25 is chosen such that free

-413191spl movement of main and grab sleds. To compensate for the operating lengths of the belts 6, 20, 24, 25, a tensioning device is not shown at the end thereof.

Each main sled 14.1. 14.2 with the claw carriage 16 are balanced with respect to their weight and the weight of the floor section by a pneumatic cylinder 26 mounted on a boom

5. To this end, a rotating guide pulley 28 is mounted on the free, upwardly directed end of its piston rod 27. A flexible steel strip 29 is guided through this pulley, one end of which is fixed to the main slide frame 14 and the other end to the boom. the cylinder is made in an unknown cylinder. Within the scope of the invention there is provided a device for balancing the weight between the main and the grab sleds.

The operation of the transport equipment is as follows:

In the overhead conveyor line 10, the modular parts of the floors are tethered. To grasp them, the grab carriage 16 is extended to its highest position. The boom 5 comes into its most extreme position. In this state, the grab carriage is in its highest position above the part of the floor to which they are lowered and the grab device 18 is pneumatically closed. With a short stroke of the grab carriage, the floor part is transferred from the trolley (Skid) U to the overhead conveyor line 10. The boom 5 now passes into an intermediate position. In this position, the main carriage 14.2 is lowered with its gripper carriages 16 onto the treated floor portion of the clamping device 1. Its gripper devices 18 are pneumatically closed. The main carriage 14.2 and their grab carriage 16 lift the finished part of the floor from the clamping device and go at a height above the welding robot 30. The boom 5 now moves to the next intermediate position. During this movement, the main carriage 14.1 brings the unprocessed floor part to the clamping device and stores it there for processing. In order to allow the work on the welding robots, the main carriage 14.1 with the claw carriage goes above the welding robot 30. At the same time, the main carriage 14.2 with the claw carriage and the finished floor part reach their highest position and then the boom 5 into their outer end position. There, the finished floor part on the suspended conveyor line 9 above the trolley (Skid) H is supported by pneumatic opening of the grab device 18. The trolley H is in fact replaced by an empty trolley. Meanwhile, other main sleds 14.1 with their grab sleds have also reached the highest position. In this position there is no floor part on any grab carriage. Now the boom 5 goes to

-513191spl opposite end position. There, there is a grab sled 16 over the tactile unprocessed part of the floor, which grips it with its grab device 18 and, as already mentioned, transports it. After the unprocessed parts of the floor have been placed on the clamping device 1 and the main carriages 14, 1, 14, 2 with the gripper carriage have been discharged, the fed parts are delivered to the clamping device 1 and welded there with the unprocessed part of the floor.

Main slide drive procedure 14.1. 14.2 and the grab carriage 16 is as follows:

Each drive motor 9 drives a toothed belt 20 via a pulley 20. main sled 14.1. Changing the rotation of the drive motor changes the direction of movement of the main carriage. When the main carriage is in its upper end position, the grab carriage 16 is driven by toothed belts 24. 25 so that the carriage carriage also stands in the upper end position of the main carriage. By connecting the toothed belt belts 24, 25 of the grab carriage 5 to the boom 5 and wrapping it over the pulley pulley 23 at the ends of the main carriages 14.1, the speed of the grab carriage is doubled. This results in short lifting times.

Analogous to toothed belt transmissions, it can be 14.1 as the main carriage drive. 14,2 also uses a toothed rack drive or a threaded spindle with a nut. However, the grab carriage drive is in these cases a toothed belt or belt of the type described. Hydraulic or pneumatic piston actuators may also be used with particular limitations for particular embodiments.

Claims (6)

1. Transport equipment for tubular welding equipment for welded parts of car bodies, in particular floor parts, with suspended lines for feeding and withdrawing welded parts, characterized in that it has the following features: • guided beams (4) arranged on both sides of the clamping device (1) for the welded parts and transverse booms (5) mounted thereon; • vertically moving main carriages (14.1, 14.2) with two guide rails (13, 15) placed opposite one another on both sides of the boom (5) towards the tracks (9, 10); • vertically moving grab carriages (16) mounted on each guide bar (15) in the direction of the tracks (9, 10) of the main carriages (14.1, 14.2); • driving motors (19) for each main carriage (14.1, 14.2) and their grab carriage (16) attached between the main carriage (14.1, 14.2) on the boom (5). Welding device according to claim 1, characterized in that the drives of the bogie chassis (5), the main carriage (14.1, 14.2) and the grab carriage (16) have NC control. Welding device according to claims 1 and 2, characterized in that the chassis drives are realized as toothed rack or threaded spindle drives with nut, or as toothed belt drives or hydraulic or pneumatic piston drives, where the chassis drive of the grab carriage (16) is. in any case, derived by toothed belts or belts from the main carriage. 4. Drive of vertical chassis of main carriage and grab carriage by toothed belt, characterized in that on the boom (5) is mounted an electric motor (19) driving a pulley of the toothed belt (20), around which an open toothed belt (21) is wrapped. the end is fixed at the upper edge of the main slide (14.1, 14.2) and the other end at the lower edge of the main slide (14.1, 14.2) and that at both ends of the main slide The freely rotating pulleys of the toothed belt (23) are supported through which an open toothed belt (24, 25) is wrapped, one end of which is fastened to a boom and the other end to a grab carriage (16). A toothed belt drive according to claim 4, characterized in that each toothed belt (6, 20, 24, 25) is tensionable in the longitudinal direction. Toothed belt drive according to Claims 4 and 5, characterized in that a weight-balancing device (26) is hydraulically or pneumatically driven for each main carriage (14.1, 14.2) by means of a claw carriage (16), that its power member (28) is coupled to the main carriage (14.1, 14.2) and the boom (5) by the traction member (29).