JP2003145359A - Workpiece carriage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use the base of a workpiece carrier in common and provide a simple low-cost detachable structure for a jig plate to be mounted on the base. SOLUTION: On the workpiece carrier 1 travelling along an assembly line while mounting thereon workpieces W including vehicle underbodies, the jig plate 6 with a jig is detachable mounted for positioning the workpieces W. A plurality of burr clamps 8 are arranged for fixing the jig plate 6 to the edge of the carriage 1. The burr clamps 8 are opened/closed by an actuator 24 arranged sideways to the attachment/detachment position of the jig plate 6 on the assembly line.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a work carrier having a work such as an underbody constituting a vehicle body and moving along an assembly line. The present invention relates to a work carrier having a jig plate with a jig for positioning, which is detachably mounted on the cart. 2. Description of the Related Art A plurality of jigs for positioning a work are provided on a work transporting trolley on which an assembling work such as an underbody is mounted and which moves on an assembly line. These jigs are generally fixed to a work transport cart, and the entire cart is a dedicated product for each type of work. [0003] The number of bogies used in an assembly line of an automobile body is very large, and the cost of bogies accounts for a considerable portion of the initial capital investment. In particular, the number of types of bogies used increases on multi-model assembly lines,
The cost increases accordingly. However, among the components of the truck, only the positioning jig disposed on the truck is exclusive to the vehicle type, and the base of the truck can be shared by other models. An object of the present invention is to provide a simple and low-cost attachment / detachment structure for a jig plate mounted on a base, while sharing the base of the work carrier. [0004] In order to solve the above-mentioned problems, a work transport trolley according to the present invention mounts a work, such as a vehicle body, on a work transport trolley movable along an assembly line. A jig plate with a jig for positioning is removably mounted, and a plurality of burr clamps for fixing the jig plate are arranged on an edge of the carriage, and the burr clamp is mounted on a jig plate on an assembly line. Is opened and closed by an actuator disposed on the side of the attaching / detaching position. The jig plate is fixed to the jig plate by moving the work carrier with the jig plate mounted thereon to a position where the jig plate is attached and detached, and closing the burr clamp of the jig with an actuator. When exchanging the jig plate on the trolley due to production vehicle type switching (stage change), move the trolley again to the jig plate attaching / detaching position, open the burr clamp with the actuator, and remove the jig plate. The jig plate is desirably divided into a plurality of segments so that it can be easily handled by a general-purpose robot or the like and to minimize the change cost. Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a work carrier 1 has a plurality of wheels 2 and a pair of right and left rails 3.
2 and 3 on which the base 4 can travel.
And a plurality of jig plates 6 which are removably mounted by the general-purpose robot 5 as described above. On each jig plate 6, a plurality of jigs 7 for positioning a workpiece W such as an underbody are fixed. A burr clamp 8 as shown in FIGS. 1, 4 and 5 is provided on both left and right side edges of the base 4.
Are provided corresponding to the mounting positions of the jig plate 6. These burr clamps 8 are for fixing the jig plate 6 by vertically holding the left and right edges of the jig plate 6 between the base and the base, and include a bracket 12 fixed to the side surface of the base 4. A clamp lever 14 that is rotatable about a pin 13 supported at the tip of a bracket 12;
It comprises an operation lever 16 rotatable around another pin 15 supported on an intermediate portion of the bracket 12, and a link plate 19 connecting the intermediate portion between the clamp lever 14 and the operation lever 16 via pins 17, 18. ing. As shown in FIG. 1, actuators 24 driven by air cylinders 23 are arranged on both sides of the jig plate 6 on the assembly line. The actuator 24 is attached to the upper end of an inclined column 25 inclined outwardly on the opposite side of the carriage 1, and a U-shaped engaging metal fitting 26 connected to a piston rod of an air cylinder 23 is provided.
The variclamp 8 extends to near the tip of the operation lever 16. When the air cylinder 23 is extended while the tip of the operation lever 16 is inserted into the U-shaped opening 27 of the engagement fitting 26 as shown in FIG. 4, the clamp lever 14 of the variclamp 8 is moved in the direction of the arrow in FIG. And presses the upper surface of the edge of the jig plate 6. Further, as shown in FIG. 5, when the air cylinder 23 is shortened with the distal end of the operation lever 16 of the variclamp 8 closed in the U-shaped opening 27 of the engagement fitting 26, the variclamp is performed. 8, the clamp lever 14 can be turned in the direction of the arrow in FIG. 5 so that the jig plate 6 can be removed. The work carrier 1 is constructed as described above, and the jig plate 6 is attached and detached as follows. First, as shown in FIG. 2, a plurality of jig plates 6 corresponding to the production vehicle type are mounted on the base 4 using a robot or the like, and the base 4 is mounted along the rails 3 with the actuators 24 of FIG. To the specified position. At this time, the engagement fitting 26 of the actuator 24 is on standby at the chain line position in FIG. 4, and the tip of the operation lever 16 of the variclamp 8 enters from the side of the opening 27 of the engagement fitting 26. When a sensor (not shown) detects that the work carrier 1 has moved to a predetermined position, the air cylinder 23 is extended and the engagement fitting 26 moves in the direction of the arrow in FIG. As a result, the operation lever 16 of the burr clamp 8 is rotated upward in FIG. The engagement fitting 26 finally moves to the position shown by the chain line in FIG. The jig plate 6 is fixed to the base by clamping all the toggle clamps in the same manner as described above, and the work W such as an underbody can be positioned and mounted on the jig plate 6. Next, when the burr clamp 8 is opened to replace the jig plate 6, the work carrier 1 is again moved to the position shown in FIG. Then, the distal end of the operation lever 16 of the variclamp 8 is inserted from the side of the opening, and the air cylinder 23 is shortened to open the variclamp 8 as shown in FIG. The jig plate 6 can now be removed, and the robot 5 can be removed as shown in FIG.
The jig plate 6 is replaced by using. Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the embodiment, the variclamp 8 is opened and closed by the actuator 24. However, it is also possible to open and close the variclamp 8 by a robot instead of the actuator 24. Further, a plurality of actuators 24 may be provided corresponding to the number of the variclamps 8, and the plurality of variclamps 8 may be opened and closed at the same time, or the number of the actuators may be minimized to reduce equipment costs. All the vari-clamps 8 may be opened and closed while the work carrier is intermittently moved beside the actuator 24. As described above, according to the present invention, the jig plate is removably mounted on the trolley. Therefore, the base of the trolley can be used in common, and the jig plate can be replaced simply by replacing the jig plate. Since the change can be handled, the change cost can be reduced. Also, since a plurality of jig plate fixing variclamps arranged on the edge of the trolley are opened and closed by actuators arranged on the side of the jig plate attaching / detaching position, variclamp driving means is provided for each transport trolley. There is no need to arrange them, and the cost of the truck can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a work carrier according to the present invention. FIG. 2 is a perspective view of a work carrier when a jig plate is mounted. FIG. 3 is a plan view of a work carrier. FIG. 4 is a side view of the variclamp in an opened state. FIG. 5 is a side view of the variclamp in a closed state. [Description of Signs] 1 Work carrier 3 Rail 4 Base 5 General-purpose robot 6 Jig plate 7 Jig 8 Vari clamp 24 Actuator W Work

Claims (1)

Claims 1. A jig plate with a jig for positioning a work is removably mounted on a work carrier having a work such as a vehicle body mounted thereon and movable along an assembly line. A plurality of burr clamps for fixing the jig plate are provided on the edge of the bogie, and the burr clamps are opened and closed by an actuator provided on a side of the assembly line where the jig plate is attached / detached. A work transport cart characterized by the above-mentioned.