JPS6355400B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jig changing device in an automatic welding device mainly used for welding the body of a motorcycle.

The applicant of the present application has previously proposed a welding device of this type in Japanese Patent Application No. 11804/1983, which includes a lower carriage that can freely reciprocate between a work set position and a welding position in front of it, and a welding position and a welding position in front of it. A reciprocating upper carriage is provided between the lower carriage and the lower carriage, and a first jig for work setting is attached to the lower carriage, and the first jig is attached to the upper carriage via a vertically movable elevating frame suspended from the upper carriage. supporting a second jig that receives the workpiece on the jig;
After setting a work consisting of a plurality of members constituting the vehicle body on the first jig at the setting position,
The workpiece is carried to the welding position by the advancement of the lower truck, the first welding is performed, and then the workpiece is moved to the second welding position.
The workpiece is received by a jig, the second jig is made reversible, for example, and the posture of the workpiece is changed to perform the second welding, and then the workpiece is transported to the delivery position by the advancement of the upper cart. When changing the model of the workpiece, the second jig is docked to the first jig, disengaged from the lifting frame, and both jigs are moved by the lower cart. It is common practice to replace the jig by moving it to the work set position.In this case, it is necessary to arrange various jig replacement members such as a chain block or a convore to lift the first jig from the lower cart at the work set position. As a result, the space for placing the work and the work space are narrowed, resulting in the inconvenience of worsening the workability of work setting work. In the present invention, the first jig is lifted from the lower cart by a lift frame provided on the upper cart and transported to a payout position, and at this position, the first jig and the second jig are docked with other jig units. The object of the present invention is to provide a device that is replaceable and eliminates the above-mentioned disadvantages, and includes a lower truck that can freely reciprocate between a work set position and a welding position in front of the work set position, and A reciprocating upper carriage is provided between the front delivery position and the lower carriage, and a first jig for setting the workpiece is mounted on the lower carriage, and a lifting frame that can be raised and lowered is suspended from the upper carriage. In the automatic welding apparatus, the elevating frame includes a first clamp member for the second jig, and a second jig for receiving the workpiece on the first jig. A second clamp member is provided for use, and a jig unit consisting of the first jig and the second jig, which is in a docked state at the dispensing position by the second clamp member, can be freely replaced with another jig unit. The invention is characterized in that it is equipped with a jig conveyance device.

The present invention will be explained below with reference to the illustrated embodiments.

In the drawing, 1 is the guide rail 2, 2 installed on the floor.
A lower carriage 6, which is reciprocated by a drive motor 3 via a pinion 4 and a rack 5, is erected on both sides of the welding position B between the workpiece set position A and the welding position B in front of it. An upper truck is reciprocated by a drive motor 9 via a pinion 10 and a rack 11 between the welding position B and a discharging position C in front of the welding position B along guide rails 8, 8 fixed to the machine frames 7, 7. A first jig 12 for work setting is provided on the lower truck 1, and a plurality of work clamps 12a provided on the first jig 12 are used to set a plurality of workpieces that constitute the body of a two-wheeled motor vehicle. A second jig 1 in the form of an enclosing frame surrounds the first jig 12 via a lift frame 13 which can freely set a workpiece W made of members and which is suspended from the upper carriage 6 and which can be raised and lowered.
4, and the first jig 12 is supported by a plurality of work clamps 14a provided on the second jig 14.
A positioning pin 15 is attached to the first jig 12 so that the upper workpiece W can be freely received and the two jigs 12 and 14 can be docked in a mutually positioned state at the time of receiving.
has been established.

Here, the lifting frame 13 is moved along the front and rear guide bars 6a, 6a superimposed on the upper truck 6.
It is assumed that the elevator frame 1 is moved up and down by an upper elevator cylinder 16, and the elevator frame 1 is mounted at the front and rear lower ends of the elevator frame 13.
Each reversing shaft 13a is reversed by each reversing cylinder 17 on 3 via a rack 18 and a pinion 19.
between the reversing shafts 13a and 13a.
By installing the jig 14, it can be turned upside down.

There are welding robots 20 on both sides of the welding position B.
The workpiece W set on the first jig 12 at the workpiece setting position A is carried forward by the lower cart 1 to the welding position B as shown in the second figure. Each robot 20 performs the first welding, and after this welding, the lifting frame 13 is lowered and the second jig 14 is attached to the first jig 12 by the positioning pin 15 on the first jig 12 as shown in the fourth figure. 12
In this state, the workpiece clamp 12a on the first jig 12 is unclamped, and the workpiece clamp 14a on the second jig 14 is clamped. The tool 14 receives the workpiece W, and then the lifting frame 13
is raised and the second jig 14 is rotated to perform the second welding on the workpiece W. After this welding, the workpiece W is moved to the unloading position C by the advancement of the upper cart 6.
At the same time, the workpiece is transferred to an appropriate workpiece discharging member (not shown) to discharge the workpiece, and in parallel with this operation, the lower cart 1 is returned to the workpiece setting position A and the next workpiece W is set. By repeating the above steps, we were able to continuously weld the car body. Although the above is not particularly different from the above-mentioned proposal, according to the present invention, the lifting frame 13 is moved from the lower truck 1 with the first jig 12 docked to the second jig 14 at the welding position B. Both jigs 12 and 14 can be delivered to and freely transported to the dispensing position C, and are in a docked state at the dispensing position C.
The jig unit U consisting of the jig unit U can be freely exchanged with other jig unit U.

To explain this in detail, in addition to the first clamp member 21 for the second jig 14, the first
A second clamp member 22 for the jig 12 is provided, and the second jig 14 has positioning pins at the front and rear mounting bases 14b of the second jig 14 on the lower surface of the bracket 13b fixed to the reversing shaft 13a. 23 and the first clamp member 21, and the positioning pins 15 for docking described above are planted on each of the front and rear flanges 12b of the first jig 12, and the lifting frame 13 is fixed in position. Both jigs 1 due to lowering
2 and 14, the pin 15 is inserted into the mounting base 14b so that the flange 12b is superimposed on the lower surface of the mounting base 14b, and the second
The clamp member 22 includes a clamp arm 22c connected to a clamp cylinder 22a via a link 22b, and the arm 22c is connected to the flange 1.
The arm 22c is configured to be able to swing freely toward the lower surface of the flange 12b, and when the arm 22c is pivoted toward the lower surface of the flange 12b with both jigs 12 and 14 docked, the flange 12b and the mounting base 14b are clamped and fixed between the bracket 13b in an overlapping state, that is, the first jig 12 is docked to the second jig 14, and the elevating frame 1 is
Fixed to 3.

At the delivery position C, a jig exchange conveyor 24 is installed.
A jig storage device 25 is installed in which the jig units U can be freely stored in multiple stages on both the left and right sides, and is connected to the conveyor 24. The jig unit U can be freely replaced with the device 25.

The above-mentioned first clamp member 21 includes a clamp bar 21c having a lower end engaging portion 21b which can be freely engaged with and detached from the lower surface of the mounting base 14b by an actuator 21a on the bracket 13b, which can be pivoted and moved up and down. Since this is conventionally known, detailed explanation thereof will be omitted.

Next, to explain the work procedure for replacing the jig, the first jig 12 is transported empty to the welding position B by moving the lower truck 1 forward, and then the lifting frame 13 is lowered and the second jig 14 is replaced with the first jig 14. The first jig 12 is docked to the jig 12, and in this state the second clamp member 22 is operated to fix the first jig 12 to the elevating frame 13 as described above.Then, the elevating frame 13 is raised and the first jig is fixed. The tool 12 is lifted from the lower truck 1 and transported to the payout position C by the advance of the upper truck 6, and after this transportation, the elevating frame 13 is lowered and the operation of the first clamp member 21 and the second clamp member 22 is released. Then, the first jig 12 and the second jig 14 are transferred onto the jig exchange conveyor 24 provided at the delivery position C.

Next, the used jig unit U transferred to the conveyor 24 is replaced with the jig unit U to be used next, taken out from the jig storage device 25,
The first jig 12 and the second jig 1 of the next jig unit U
4 is fixed to the elevating frame 13 by the operation of the first clamp member 21 and the second clamp member 22 in a docked state, and is conveyed to the welding position B by the operation opposite to the above. The first jig 12 is moved to the upper trolley 6
In this state, the operation of the second clamp member 22 is released and the first jig 12 is transferred to the upper carriage 6.

To replace the jig unit U described above, after transferring the used jig unit U to the conveyor 24, the elevating frame 13 is raised once, and the unit U is moved to the payout position by the operation of the conveyor 24. The jig unit U that has been moved from C to the right in FIG. 3 and taken out from the jig storage device 25 in advance
After moving the jig unit U to the welding position C and transporting the jig unit U to the welding position B as described above, the used jig unit U is transported to the device 25 and stored therein.

As described above, according to the present invention, the first jig on the lower truck is delivered to the lifting frame provided on the upper truck in a docked state with the second jig, and is transported to the dispensing position. This is designed to replace the jig with the tool unit, and unlike the jig that is replaced at the work setting position, it secures a wide space and work space for placing the work at the setting position, making it easier to set the work. It has the effect of improving work efficiency.

[Brief explanation of drawings]

Fig. 1 is a plan view of an automatic welding device for motorcycles to which the device of the present invention is applied, and Fig. 2 is a plan view of an automatic welding device for motorcycles to which the device of the present invention is applied.
Figure 3 is a front view when the jig is replaced as seen from the - line in Figure 1. Figure 4 is a side view when the first jig and second jig are docked at the welding position. 5 is an enlarged side view of the main part thereof, and FIG. 6 is a sectional view taken along the line -- in FIG. 1...Lower truck, 6...Upper truck, 12...First jig, 13...Elevating frame, 14...Second jig, 2
1... First clamp member, 22... Second clamp member, W... Work, A... Work set position,
B...Welding position, C...Payout position, U...Jig unit.

Claims (1)

[Claims] 1. A lower trolley that can freely reciprocate between a workpiece set position and a welding position in front of it, and an upper trolley that can freely reciprocate between the welding position and a payout position in front of the welding position. Automatic welding in which a first jig for setting and a second jig for receiving a workpiece on the first jig are supported via a vertically movable lifting frame suspended from the upper truck. In the apparatus, a second clamp member for the first jig is provided in addition to the first clamp member for the second jig on the elevating frame, and the elevating frame is docked with the second clamp member at the dispensing position. A jig exchange device for an automatic welding apparatus, characterized in that a jig conveying device is provided to allow a jig unit consisting of the first jig and the second jig to be exchanged with another jig unit.