JPH0619992U - Welding jig transfer device - Google Patents

Abstract

(57) [Abstract] [Purpose] When a carriage on a lifting rail is pitch-fed using a carrier member that reciprocates along a lifting rail, selective engagement and release of the carriage and the carrier member are performed. It should be able to be done quickly without increasing the weight of the trolley. [Structure] An engaging member (10) provided on a carriage (3) forming a welding jig (3A), which is arranged on a lifting rail (1A, 1B), and a pitch feed of the carriage (3) by reciprocating motion. Provided on the carrying bar (4) for carrying out the lifting rails (1A, 1
When B) is placed in the raised position, engagement with the engagement member (10) is made, and when the elevation rails (1A, 1B) are lowered from the raised position, engagement with the engagement member (10) is made. The engaged member (15) to be released.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a welding jig transporting device that transports a welding jig that supports a workpiece to be welded by using a lifting rail.

[0002]

[Prior art]

 In a vehicle assembly line, various parts are welded to a work such as an upper body member or an underbody member that composes a body of an automobile at a welding work station. Usually, a plurality of welding work stations are installed, and a trolley forming a welding jig for supporting the work is sequentially conveyed to the plurality of welding work stations by pitch feed, and a panel is attached to the work supported by the welding jig. Alternatively, the reinforcing member is welded and joined. A lift-and-carry type transfer device is known as a transfer device used to feed such a dolly by lifting rails laid along a plurality of work stations.

Such a lift-and-carry type transfer device is provided with, for example, a transfer bar that reciprocates along an elevating rail. When the lifting rail is placed in the raised position, the transport bar is engaged with the dolly arranged on the lifting rail to move the trolley forward from one work station to the preceding work station. When the lifting rail is placed in the lowered position, the engagement with the carriage is released and the carriage is retracted to return to the original position, whereby the carriage is pitch-fed. As an engagement means for selectively engaging and disengaging such a carriage and a transport bar, for example, in Japanese Patent Laid-Open No. 63-306110, a carriage provided with a jig for supporting a work is used. An engaging claw arranged to be able to move up and down, a receiving block provided on the transport bar, and a drive unit including a cylinder arranged on the carriage for moving the engaging claw up and down via a rod are provided. It has been proposed that the state in which the claw engages with the receiving block and the state in which the engaging claw is released from the engagement with the receiving block are obtained in accordance with the vertical movement of the engaging claw by the cylinder. ing.

[0004]

[Problems to be solved by the device]

 A carrier that forms a welding jig to support the work is arranged on the lifting rails, and the carrier is designed to feed the carriage pitch by the carrier bar. In addition, it is desirable to reduce the weight of the bogie from the standpoint of accurate and accurate positioning. However, when the trolley thus arranged on the lifting rail is provided with the drive unit including the cylinder for selectively engaging and disengaging the trolley and the transfer bar as described above, the drive unit causes the trolley to move. There is a problem that the weight of the truck is increased. Moreover, in the drive unit including the cylinder, the rod provided on the cylinder is extended after the carriage and the conveyor bar are positioned, so that the time required for carriage of the carriage is shortened. There is also the problem of difficulty.

In view of such a point, the present invention arranges a carriage forming a welding jig for supporting a work to be welded in a welding work area on a lift rail and reciprocates along the lift rail. When the carriage is conveyed by using the conveying member, the selective engagement between the carriage and the conveying member and the release thereof can be performed without complicating the structure of the carriage and increasing the weight. An object of the present invention is to provide a welding jig transfer device capable of shortening the time required to transfer a dolly.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the welding jig transporting device according to the present invention is provided on an elevating rail part laid along a welding work area, and is arranged on the elevating rail part, and welding is performed in the welding work area. An engaging member provided on a carriage forming a welding jig for supporting a workpiece to be applied, and a state in which the lift rail section is raised to a position where the carriage is supported by the lift rail section, and Equipped with an elevating mechanism part that selectively lowers the elevating rail part from a raised position to support the carriage by a fixed base, a conveying member that reciprocates along the elevating rail part, and a conveying member. The engaged member that is selectively engaged with and disengaged from the engaging member, and the engaging member engages the engaged member, and the conveying member moves from the first position to the second position. To move to the position of And a conveyance drive mechanism section that causes the conveyance member to return from the second position to the first position when the engagement member is lifted by the elevating mechanism section. When the rail portion is in the raised position, it is engaged with the engaging member, and when the lifting mechanism portion lowers the lifting rail portion from the raised position, the engagement with the engaging member is released. Configured.

[0007]

[Action]

 In the welding jig conveying apparatus according to the present invention having the above-described structure, the engaging member provided on the carriage forming the welding jig and the engaged member provided on the conveying member are moved up and down. Depending on the up-and-down movement of the rail part, it is easily put into the mutual engagement state or the non-engagement state, and the carriage and the transport member are brought into the mutual engagement state through the engaging member and the engaged member. The carriage is carried by the carrying member that is moved from the first position to the second position. Each of the engaging member and the engaged member has an extremely simple structure, which prevents the weight of the carriage from increasing. Further, since the selective engagement and disengagement of the engaging member and the engaged member are performed with the ascending / descending movement of the ascending / descending rail portion, the time required for transporting the carriage is shortened.

[0008]

【Example】

 3 and 4 show an example of a welding jig conveying device according to the present invention, together with a welding jig conveyed thereby.

In FIGS. 3 and 4, the welding work stations S1, S2 and S3 are each provided with a fixed base 2, and the welding work stations S1, S2 and S3 are respectively provided with a pair of lifts. Rails 1A and 1B are laid above the fixed base 2. The lifting rails 1A and 1B in each of the welding work stations S1, S2 and S3 have a length equal to each other and are connected to each other, and a trolley 3 forming a plurality of welding jigs 3A is arranged. A transport bar 4 extending along the welding work stations S1, S2 and S3 is disposed between the lifting rails 1A and 1B and the fixed base 2. The lift rails 1A and 1B are moved up and down by the operation of the air cylinder 7, and the conveyor bar 4 is reciprocated along the lift rails 1A and 1B by the operation of the motor 8 with a speed reducer. . Further, a plurality of engaged members 15 arranged along the extending direction of the elevating rails 1A and 1B are provided on the upper surface of the transport bar 4.

The carriage 3 in each of the welding work stations S1, S2 and S3 supports, for example, a work W which is an underbody member constituting a body of an automobile by a plurality of welding jigs 3A formed by the carriage 3. Then, it is arranged on the elevating rails 1A and 1B via a plurality of rotating rollers 9. The work W is welded to parts such as a panel or a reinforcing member by a welding robot (not shown) at each of the welding work stations S1, S2 and S3. A plurality of engaging members 10 are provided on the lower surface of the carriage 3, and the engaging member 10 is provided with a plurality of engaged members 15 provided on the carrying bar 4 when the carrying bar 4 is in a stopped state. It is placed in a position facing one. The engaging member 10 provided on the carriage 3 and the engaged member 15 provided on the transport bar 4 have bases 11 and 16, respectively, as shown in FIGS. The base portion 11 of the engaging member 10 is provided with a supporting portion 12 extending downward, and a pair of protruding portions 13 respectively protruding along the width direction of the carriage 3 is provided at a tip portion of the supporting portion 12. It is provided. On the other hand, the base portion 16 of the engaged member 15 is provided with a wall portion 18 extending upward from each of both side portions extending along the carrying bar 4 to form a relatively large space portion 17 therebetween. ing. A pair of projecting side portions 20 forming a recess 19 is provided at the tip of each of the wall portions 18, and the base portion 16, the wall portion 18, and the projecting side portion 20 allow the lifting rails 1A and 1B to move. A pair of openings 21 arranged along the extending direction is formed.

On the other hand, as also shown in FIG. 5, each of the elevating rails 1 A and 1 B is supported by a pair of link mechanisms 25 so as to be able to ascend and descend. The link mechanism 25 for supporting the lifting rail 1A has a flat plate member 27 attached to the lifting rail 1A and a flat plate member 28 attached to the fixed base 2, and also supports the lifting rail 1B. The link mechanism 25 has a flat plate member 27 attached to the lifting rail 1B and a flat plate member 28 attached to the fixed base 2. One of the link mechanisms 25 that supports the elevating rail 1A and one of the link mechanisms 25 that supports the elevating rail 1B are connected by a connecting member 26A extending along the width direction of the transport bar 4, and the ascending / descending movement is also performed. The other side of the link mechanism 25 supporting the rail 1A and the other side of the link mechanism 25 supporting the lifting rail 1B are connected by a connecting member 26B extending along the width direction of the transport bar 4.

The flat plate members 27 and 28 in each of the link mechanisms 25 connected by the connecting member 26A are configured to be rotatable around the connecting member 26A as a supporting shaft, and by the connecting member 26B. The flat plate-shaped members 27 and 28 in each of the linked link mechanisms 25 can rotate about the connecting member 26B as a supporting shaft. The connecting members 26A and 26B are connected via a three-way joint 29 and a four-way joint 30 to a connecting member 32 arranged along the extending direction of the transport bar 4, and the four-way joint 30 has a connecting member 33. The rod 7a of the air cylinder 7 is connected via. The rod 7a of the air cylinder 7 is adapted to be expanded and contracted along the direction in which the transport bar 4 extends. A lifting mechanism unit is configured to include a pair of link mechanisms 25 that respectively support the air cylinder 7 and the lifting rails 1A and 1B.

When the air cylinder 7 provided for the elevating rails 1A and 1B is operated, the rod 7a thereof is in an extended state, and the flat plate-shaped members 27 and 28 of the link mechanism 25 are connected to each other by the connecting members. The link mechanism 25 is rotated about 26A or 26B in the direction of bending displacement of the entire link mechanism 25. As a result, the elevating rails 1A and 1B are moved downward together with the carriage 3 while being guided by the plurality of elevating guides 24 from the elevated position as shown by the solid lines in FIGS. 3 and 4. And in the lowered position as indicated by the dashed line in FIG. At this time, the carriage 3 is brought into contact with the upper surface portions of the plurality of columns 35 that are erected on both sides of the fixed base 2. A clamp member 36 is connected via a bracket 37 to two of a plurality of columns 35 that are respectively provided upright on both sides of the fixed base 2. As shown in FIG. 6, each clamp member 36 is provided with an air cylinder 38 which is brought into an operating state when the carriage 3 is brought into contact with the plurality of columns 35. When the carriage 3 comes into contact with the plurality of columns 35 by the operation of lowering the elevating rails 1A and 1B of the elevating mechanism portion, each clump member 36 is shown by the dashed line in FIG. 6 by the operation of the air cylinder 38. As described above, the carriage 3 is placed in a state of being pressed from the upper surface side. As a result, when the lifting rails 1A and 1B are in the lowered position, the carriage 3 is pressed downward by the plurality of clamp members 36 and is reliably supported by the fixed base 2 through the plurality of columns 35. To be placed.

On the other hand, when the lift rails 1A and 1B are in the raised position, the carriage 3 and the transport bar 4 have the protrusions 13 of the engaging member 10 that are engaged with each other as shown by the solid lines in FIG. The recesses 19 in the mating member 15 are engaged with each other, and the mutual engagement state is maintained. When the lifting rails 1A and 1B are lowered from the ascending position, the carriage 3 and the carrying bar 4 which are in the mutual engagement state have one point in FIG. As indicated by the chain line, the engagement with the recessed portion 19 in the engaged member 15 is released, and the member 15 is positioned in the space 17 and is left in the disengaged state. In this way, the carriage 3 and the transport bar 4 which are placed in the non-engaged state are one of the pair of openings 21 provided in the engaged portion 15 of the transport bar 4 facing the engaging member 10 of the carriage 3. Through them, they can be separated from each other.

As shown in FIG. 5, the transport bar 4 is supported by a plurality of support members 40 arranged on the fixed base 2. A pinion gear 42 is attached to an output shaft of a motor 8 that reciprocates the transport bar 4, and the pinion gear 42 is engaged with a rack 43 arranged on the lower surface of the transport bar 4. A transport drive mechanism portion for the transport bar 4 is configured by including the motor 8, the pinion gear 42, and the rack 43. The motor 8 in the transport drive mechanism unit is normally rotated for a predetermined period, for example, when the elevating rail portions 1A and 1B laid at each of the welding work stations S1, S2, and S3 are in the raised position. As a result, the pinion gear 42 is placed in a rotating state in which it is moved in a direction (direction A) indicated by an arrow A in FIG. 5 by a distance (1 pitch) slightly larger than the length of the carriage 3. Then, with the movement of the rack 43, the transport bar 4 is moved in the A direction by one pitch. Further, the motor 8 is reversed for a predetermined period, for example, when the ascending / descending rail portions 1A and 1B laid at the welding work stations S1, S2 and S3 are placed in the descending position. As a result, the pinion gear 42 is placed in a rotating state in which the rack 43 is moved by one pitch in the direction opposite to the A direction, and with the movement of the rack 43, the transport bar 4 is moved by one pitch in the A direction. Can be moved in the opposite direction.

In each of the welding work stations S1, S2 and S3, the elevating rails 1A and 1B laid thereon are in the lowered position, and the trolley 3 is supported by the solid pedestal 2 through the plurality of columns 35. While the carriage 3 and the transport bar 4 are in the disengaged state in which they can be separated from each other, the welding robot applies the work W supported by the plurality of welding jigs 3A formed by the carriage 3 to each other. Welding of parts is performed. Further, in such a case, the motor 8 in the transport drive mechanism unit reverses for a predetermined period, and the transport bar 4 is moved by one pitch in the direction opposite to the A direction. As a result, the plurality of engaged members 15 of the transport bar 4 are opposed to the engaging members 10 of the trolley 3 supported by the fixed base 2 at the welding work station S3, for example. The work station S2 is moved so as to be opposed to the engaging member 10 of the carriage 3 supported by the fixed base 2 at the work station S2.

At the welding work stations S1, S2, and S3, when the welding and joining of the parts to the work W is completed, the lifting rails 1A and 1B installed on the welding work stations S1, S2, and S3 are lifted and lowered. The operation of the air cylinder 7 in the mechanical section is stopped, and the rod 7a is placed in a contracted state. When the rod 7a is placed in the contracted state, the flat plate members 27 and 28 of the link mechanisms 25 arranged on the elevating rails 1A and 1B respectively use the linking member 26A or 26B as a support shaft. The whole is rotated in a direction in which it is extendedly displaced, whereby the elevating rails 1A and 1B are moved upward and are placed in the raised position as shown by the solid line in FIGS. 3 and 4. At this time, each clamp member 36 is separated from the carriage 3 as shown by the solid line in FIG. 6 by stopping the operation of the air cylinder 38 provided therein, whereby the carriage 3 is The lifting rails 1A and 1B move upward as they rise, and are separated from the plurality of columns 35 and are supported by the lifting rails 1A and 1B.

When the lifting rails 1A and 1B are placed in the raised position, the engaging members 10 provided on the carriage 3 are engaged with the engaged members 15 provided on the transport bar 4 facing the engaging members 10. , The carriage 3 and the carrying bar 4 are placed in a mutually engaged state. Then, with the lifting rails 1A and 1B in the raised position and the carriage 3 and the transport bar 4 in the mutually engaged state, the motor 8 in the transport drive mechanism section rotates in the normal direction for a predetermined period, and the transport bar 4 moves. , With the carriage 3 engaged therewith, moved in the A direction by one pitch. Thereby, the carriage 3 forming a plurality of welding jigs 3A for supporting the welded work W at each of the welding work stations S1, S2 and S3 is laid at, for example, the welding work station S2. The lifting rails 1A and 1B are moved to the lifting rails 1A and 1B laid in the welding work station S3 preceding the welding work station S2. Then, as described above, the elevator rails 1A and 1B laid in each of the welding work stations S1, S2, and S3 are moved up and down, and the reciprocating movement of the transport bar 4 is repeatedly performed to support a plurality of workpieces W. The welding jig 3A is sequentially transported to the welding work stations S1, S2 and S3, and the work W supported by the plurality of welding jigs 3A is welded at each of the welding work stations S1, S2 and S3. It

[0019]

[Effect of device]

 As is clear from the above description, according to the welding jig conveying apparatus of the present invention, the engaging member provided on the carriage forming the welding jig and the engaged member provided on the conveying member are provided. According to the ascending / descending movement of the elevating / lowering rail part, they are easily brought into the mutual engagement state or the non-engagement state, and the carriage and the transport member are brought into the mutual engagement state through the engaging member and the engaged member. Since the carriage is carried by the carrying member that is moved from the first position to the second position, the engaging member and the engaged member can each have an extremely simple structure, which allows It is possible to avoid an increase in the weight of the truck. Further, the selective engagement and disengagement of the engaging member and the engaged member are performed in association with the ascending / descending movement of the ascending / descending rail portion, so that the time required for carrying the carriage can be shortened.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a main part in an example of a welding jig conveying device according to the present invention.

FIG. 2 is a partially cutaway plan view of a main part in the example shown in FIG.

FIG. 3 is a side view showing an example of a welding jig conveying device according to the present invention together with a welding jig conveyed thereby.

FIG. 4 is a diagram provided for explaining the operation of the example shown in FIG.

5 is a plan view of the example shown in FIG.

FIG. 6 is a diagram provided for explaining the operation of the example shown in FIG.

[Explanation of symbols]

 1A, 1B Lifting rail 2 Fixing stand 3 Bogie 3A Welding jig 4 Conveyor bar 7,38 Air cylinder 8 Motor 10 Engaging member 15 Engaged member 25 Link mechanism 35 Strut 36 Clamping member 42 Pinion gear 43 Rack

Claims (1)

[Scope of utility model registration request] 1. A trolley for forming an elevating rail portion laid along a welding work area and a welding jig which is arranged on the elevating rail portion and supports a work to be welded in the welding work area. A state in which the provided engaging member and the lifting rail portion are set to the raised position so that the carriage is supported by the lifting rail portion; and
An elevating mechanism part that selectively lowers the elevating rail part from the raised position to support the carriage by a fixed base; and a conveying member that reciprocates along the elevating rail part. When the elevating mechanism section is provided on the conveying member and the elevating rail section is in the raised position, the engaging member is engaged, and the elevating mechanism section lowers the elevating rail section from the raised position. The engaged member that is disengaged from the engaging member, and the engaging member engages with the engaged member, the conveying member moves from the first position to the second position. The carriage member is moved to the position to carry the carriage, and the carrying member returns from the second position to the first position after the engaging member is separated from the engaged member. And a transport drive mechanism section for performing an operation. Conveying device for welding jigs.