JPS6363576A - Welding jig changing device for welding line - Google Patents

Abstract

PURPOSE:To efficiently perform changing work of a welding jig by making a changing carriage freely reciprocatively between a shunting station and a welding station by the movement of a transfer bar. CONSTITUTION:Each changeover rail 10b is turned to the longitudinal position and the transfer bar 5 is moved to the welding station A side and the changing carriage 4 is carried in the welding station A and the welding jigs 1 and 1 of automatic welding equipments 2 and 2 at both sides are transferred to the carriage 4. Next, the bar 5 is moved to the front position of the shunting station D and the carriage 4 is returned to the station D and each changeover 10b is turned to the horizontal position and the carriage 4 is sent out onto the minus shunting rails 11 and 11 and the carriage 4 on which the welding jigs 1 and 1 to be used next the loaded is charged from the other side rails 11 and 11 to the station D. The carriage 4 is carried in the station A in the same way and the welding jigs 1 and 1 on the carriage 4 are transferred to the automatic welding equipments 2 and 2 at both sides and the empty carriage 4 is returned to the shunting station D and the carriage 4 is sent out onto the shunting rails 11 and 11 at the minus side or the other side.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates primarily to a welding jig exchange device in a welding line for vehicle body assembly.

(Conventional technology) Conventionally, 1% was opened in 1984 as a welding line for car body assembly.
As seen in Publication No. 14173.

A set station is placed behind the welding station, and a payout station 7 is placed in front of it.

A reciprocating set cart is provided between the set station and the welding station, and a reciprocating pay-out cart is provided between the welding station 7 and the pay-out station,
At the core setting station, the floor, roof, and site nozzle for car body components are set on the set trolley, and these are transported to the welding station by the set trolley, using automatic welding equipment placed on both sides of the welding station. It is known that the welded automobile body is transported by the delivery truck to the delivery station, and then transported from the delivery station to the expansion line by a nozzle or the like.

In addition, in order to replace the welding jig provided in the automatic welding equipment, as seen in Japanese Patent Publication No. 58-12114, a replacement trolley capable of mounting the welding jig is prepared, and the set trolley is placed on both sides of the set station. A shunting rail connected to the rail via a switch gS is provided, and the replacement cart is carried from the shunting rail to the fg contact station/yon via the traveling rail.

It is also known to exchange jigs between the exchange cart and automatic welding equipment, but in the case of H11 above, in which side panels are set on the set cart in addition to the floor and roof at the set station, the set Since setting devices for site channels are placed on both sides of the station, switching rails cannot be placed on both sides of the setting station.In this case, switching rails are provided on both sides of the dispensing station.
It is conceivable to carry the replacement cart into the welding station from the payout station side via the running rail of the payout cart.

(Problems to be Solved by the Invention) By the way, when changing jigs is performed by providing changing rails on both sides of the dispensing station as described above.

Load the empty exchange cart and the welding jig to be used next on the shunting rail on the - side, keep the nine exchange cart and the next delivery cart on standby, and then send the delivery cart to the other side shunting rail. After that, put the empty exchange trolley into the dispensing station from the shunting rail on one side.

The transmutation cart is transported along the running rail to the welding station by the drive mechanism for the delivery cart, and all used welding jigs are transferred to the replacement cart, which is then returned to the delivery station and exchanged on the other side. The exchange cart loaded with the first welding jig to be used next is loaded onto the rail from one side of the exchange rail to the exchange station, transported along the traveling rail to the welding station, and then transferred to the automatic welding equipment for nuclear exchange. fI on the trolley! i
With all the jigs installed, send out the empty exchange cart from the dispensing station to the shunting rail on the other side.Then, feed the dispensing cart to be used next from the shunting rail on one side to the dispensing station, and start the replacement work. finish.

The above is a case of installing a dedicated take-out cart for each model, but since this would increase equipment costs, it may be possible to replace only the workpiece receiver attached to the cart without replacing the take-out cart itself.

However, in this case, it is necessary to switch the order of the special pay-out cart that is first sent to the other side's shunting rail with the exchange cart that is then sent to the shunting rail, and then insert it into the pay-out station. However, it becomes necessary to connect a retractable rail or the like to the shunting rail, which complicates the structure, and there is a problem in that the shunting work takes time and work efficiency is reduced.

In addition, in order to solve this problem and to secure a large working space on both sides of the unloading station for transferring workpieces to a nozzle, etc., the distance between the welding station and the unloading station is increased. In this way, a shunting station is provided in the middle of the conveyance path connecting both the nuclear stays and shunting rails on both sides of the shunting station, and while the unloading cart is waiting at the unloading station, only the changing cart is removed from the shunting rail. It is also possible to configure the IC so that the welding station can be moved in and out of the exchange station, but in this case, the distance between the welding station and the unloading station becomes long, and it takes time for the unloading cart to go back and forth between the two stations. However, there is a problem in that this increases cycle time and reduces productivity.

An object of the present invention is to provide a device that solves these problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an automatic welding system comprising a welding station 7 and a dispensing station in front of the welding station, and a welding jig disposed on both sides of the welding station. A welding line in which workpieces are welded by a device and the welded workpieces are transported from the welding station to the delivery station via a transport path extending forward.

The welding jig of the automatic welding device is exchanged by transporting an exchange cart capable of mounting a welding jig into the welding station via the conveyance path, in which a transfer bar is provided on the conveyance path, By the reciprocating movement of the transfer bar, the workpieces are sequentially sent from the welding station to the unloading station via an intermediate station 7 recessed in the center of the conveyance path, and an exchange station with an exchange cart is provided in the middle of the conveyance path. In general, there are running rails for the exchange trolley extending from the welding station to the shunting station on both sides of the transfer bar arrangement part of the conveyance path, and switches connected to the running rails on both sides of the shunting station. A shunting rail for a replacement trolley connected to the shunting station is provided, and an engaging member is provided at each of the transfer fans to engage the replacement trolley loaded from the shunting rail to the shunting station. ) The exchange carriage is reciprocally movable between the exchange station and the welding station by the movement of a transfer bar.

(Function) When the transfer bar moves forward, the work at the welding station is supported by the rear end of the par and transferred to the intermediate station, and the work at the intermediate station is supported by the front end of the par and transferred to the unloading station. The reciprocating stroke of the transfer bar is only half the distance of transporting the workpiece from the welding station to the unloading station.
Since an exchange station is provided in the middle of the transport path connecting the two stations, even if the distance between the two stations becomes long, the work can be transported efficiently.

When replacing a welding jig, in advance, an empty replacement trolley is placed on the shunting rail on one side of the shunting station, and a replacement trolley loaded with the welding jig to be used next is placed on standby on the shunting rail on the other side. First, an empty exchange cart is introduced into the exchange station from one side of the exchange rail, and the engagement member of the transfer bar is engaged with it, and in this state, the par is moved backward toward the welding station. After moving the replacement cart back to the welding station VC and transferring the used welding jig return the trolley to the shunting station; then, send out the replacement trolley from the shunting station to one shunting rail, and put the replacement trolley on the other shunting rail into the shunting station; The exchange trolley is carried into the welding station by the double movement of the transfer bar in the same manner as above, and the welding jig on the exchange trolley is transferred to a fully automatic welding device.

Next, the empty exchange cart is returned to the exchange station by the forward movement of the par, and sent to the other side of the exchange rail to complete the exchange work.

(Smile bag example) Referring to Figures 1 and 2, A is a welding station;
B indicates a delivery station in front of the welding station N, and on both sides of the welding station N, as shown in FIG. An automatic welding device (2) equipped with a welding jig (υ) equipped with
The vehicle body W is transported to the unloading station B via a transport path (3) extending forward from the t-nasty John, and is transported from the unloading station B to an expanded welding line for the next process using a hanger or the like.

The welding jig (1) is attached to the machine base (2) of the automatic welding device (2).
m) The welding station A is removably attached to the inner surface of a pedestal (2b) that is provided above and is movable laterally.
As shown in FIGS. 4 and 5, the gripping member (4a) to be gripped by the docking member (1b) with the welding jig (υ protruding from the welding jig (υ) Then, a replacement cart (4) with support frames (4b) attached to two sets on the left and right is carried in, and a welding jig (1) is installed between the replacement cart (4) and the nuclear welding device (2). ) (1) can be exchanged freely.

In the drawing, (5) shows a transformer 7 upper installed on the conveyance path (3), and the reciprocating motion of the transformer 7 upper (5) moves the automobile body W from the welding station A to the conveyance path (3).
#! The I transfer bar (5) has a predetermined length such that when its rear end is located at the welding station A or the intermediate station OK, its front end is located at the intermediate station 0 or the payout station B.

A plurality of support members (6) for supporting the automobile body W are attached to both end portions in a detachable and replaceable manner.

The elevating frame (7), which is elongated in the front and rear direction, is elevated and lowered by a plurality of cylinders (7a) and guide bars (7b), each of which has the transfer bar (6) in the conveyance path (3). The guide rails (7c) on both sides of (7c) are supported so as to be able to reciprocate back and forth along the buff 0, and a pair of front and rear first workpieces are provided on both sides of the intermediate stay 7C and the dispensing station B, respectively. Receiver (8,) (81) and second work receiver (
82) (82), and nuclear transphano N (5
) is raised by the lifting frame (7) at the rear backward movement position, the automatic welding devices (2) on both sides of the welding station A
(24 welding jigs (υ(1)) The automobile body W held between the support member (6) at the rear end portion of the transfer bar (5) and the first work receiver ( 81) The automobile body W supported by (8,) is received by the support member (6) at the front end portion of the transfer bar (5), and the forward movement of the transfer bar (5) causes each of the The car bodies W are transported to the intermediate station O and the unloading station B, respectively, and the downward movement of the transfer bar (5) in the forward movement position causes the car bodies W to be transported to the first work receiver (81). ) (81) and the second work receivers (82) (82) on both sides of the unloading station 8, and in this state, the transfer bar (5) is moved back in preparation for the next work transfer. did.

In the drawing, (7d) indicates a shaft installed below and along the lift frame (7), and on the shaft (7d), as shown in FIG. Attach each binion (7f) that engages the rack (7e),
The lift frames (7) are moved up and down in synchronization with each other via the lifts (7d) so that the elevator frame (7) can be maintained in a horizontal position.

In the drawing, D indicates the exchange cart (
4), which shows the exchange cart (4) extending from the station A to the exchange station DK on both sides of the transfer bar (5) arrangement part of the paddy conveyance path (3).
A running rail (9) t9) for the switching station D, and a switch CIQ for the running rail (91(9)) on both sides of the switching station D.
A pair of front and rear shunting rails αυQD for the shunting cart (4) connected through (!-) shall be provided.

As shown in FIG.
At the intersection with each cylinder (10a) K, there is a vertical position that matches each traveling rail (9) and each shunting rail Oυ.
It consists of four switching rails (10bJ) that can be freely rotated 900 times in a horizontal position that matches the
10b) so that they are positioned slightly above when the lifting frame (7) is moved down, as shown in Figure 6, and with each switching rail (10b) in a horizontal position, the exchange trolley (4) is The shunting station 7 D can be freely moved in and out from the shunting rail αυαυ, and each of the switching rails (10b) is placed in a vertical position, and the switching cart (4) is moved along the traveling rail (9) (91). 1, which can freely move back and forth between the shunting station D and the welding station person, and the shunting rail (B).
The exchange cart (
4), the engaging member (5B) that engages with the transfer bar (5
), and the nuclear transmutation cart (4) is moved back and forth between the two stations /1 and D by the movement of the nuclear transfer bar (5).

The exchange trolley (4) is equipped with casters (4C) that are rotatable on a vertical axis at the four corners of its lower surface, and each of the casters (4cJ) is rotated by the rotation of each of the switching rails (10b). I made it move.

By the way, the shunting station D is the shunting rail θυαη
In order to secure a working space between the upper exchange cart (4) and the automatic welding device (2), it is desirable to install the welding station A at a sufficient distance from the welding station A. Exchange station D is arranged in front of intermediate station 0 so as to partially overlap with it.

Also, when the exchange cart (4) enters and exits the exchange station D, the transformer 77 par (5) is placed so that the sideways position switching rail (10b) does not interfere with the transfer lever (5).
) f: It is desirable to move it forward from the shunting station D, but as described above, the shunting station D
When you place the transfer bar (5) in front of this
) is moved.

Applicable/? - If (5) is kept at the above-mentioned predetermined length, its front shoulder portion will pass through the dispensing station B and protrude greatly in front of it, creating a dead space in front of the dispensing station B corresponding to this protruding length.

Line layout is restricted.

Therefore, in the one shown in Figure 1, the transfer bar (5) is made to be able to expand and contract between an extended state of the predetermined length and a contracted state of a shorter length, and the above-mentioned vehicle body conveyance is performed by reciprocating movement in the extended state. By moving back and forth in the contracted state, the transfer bar (4) is transported.To explain this in more detail, the transfer bar (5) is moved to the elevator frame (4) as shown in FIG. A lower first hole (5,) is rotatably supported by guide rails <7c)<7c) on both sides of the lower tier via a plurality of guide rollers (5b), and 51) Consists of an upper guide rail (5c) (an upper second par (52) supported by 5cJ, and connects the second notch (52) to the first notch (5,). The installed telescopic motor (5dJ
The rank (5f) that engages the binion (5e) on the output shaft of
) to expand and contract the transfer bar (5) by moving it back and forth through the second par (52);
A pair of third and fourth locking pieces (5g3) on both sides of the rear (front and rear)
5g4), and a front fixed locking piece (5h) and a cylinder (6I) as shown in Figure 8 which sandwich the second par (52) from both sides at the rear of the first par (5,). A rear movable locking piece (5j) as shown in the ninth figure that can be opened and closed is provided, and when the transfer bar (5) is in an extended state, the fixed locking piece (5h) is engaged with the first locking piece as shown in the second figure. The rear end of the locking piece (5g) and the movable locking piece C50 are connected to the second locking piece (5g2).
The second par (52) is fixed to the first notch (51) by engaging with the front end of the nuclear transfer bar (5), and when the nuclear transfer bar (5) is in the contracted state, the fixing lock is fixed as shown in the fourth figure. The piece (5h) is engaged with the front end of the third locking piece (5g3J) and the movable locking piece (5j) is engaged with the rear end of the fourth locking piece <5g4).
Nono (52) was fixed to the first par (51).

Then, the part that becomes the rear end of the transfer bar (5) in the contracted state, that is, the rear end of the first par (5), can be freely engaged with and detached from a joint member (4d) protruding from the front end of the exchange trolley (4). Attach the engaging member (5a).

If the transfer bar (5) is moved in a contracted state to a position in front of the shunting station D, and the nuclear station DK changing cart (4) is introduced from the side shunting rails (b) and (b), The engagement member (5a) K the joint member (
4d) is engaged.

In this case, the length of the par (5) protruding forward of the dispensing station B is shortened by the amount by which the transfer bar (5) is contracted, and the dead space in front of the station B is reduced.

Also, the first par (51) as shown in FIG.

A drive motor (5m) with a pinion (5t) on the output shaft that engages a rack (5k) fixed to the lifting frame (7-inch) is installed, and the motor (5m) moves the first slot (51 people). Therefore, the transfer fan (5) is made to reciprocate, and the elevating frame (7) is also provided with a pair of first and second reciprocating stops (121, 122) at the front and a pair at the rear. A first second O1 moving stopper (13, 1 (132J) is provided, and the second forward moving stopper (122) and the first backward moving stopper (131) are respectively movable upwardly and retractably, and the vehicle body is transported. When the second forward stopper (122) is projected upward and the first backward stopper (13,) is retracted downward, the second forward stopper (122) and the second backward stopper (13,) are retracted downward. (132) Welding stain Yon A regulated by
The transfer bar (5) is reciprocated within a stroke range that is half the distance of the vehicle body conveyance distance from to the payout station B, and when conveying the trolley, contrary to the above, the second forward movement stopper (12
2) is retracted downward and the first double-acting stock horns (131
) protrudes upward, and the transfer bar (5) is
Odo Stotsuno? (121) and the forward movement position in front of the exchange station D, which is regulated by
31), the welding station is made to move back and forth between the position in front of the person and the return movement position.

In addition, in the one shown in the figure, each K is provided with an intermediate station.
x Connect the support leg (8a) of the workpiece receiver (81) to the cylinder (8b
) is provided so that it can freely rise and fall in the front and back direction inside the running rail (9), and so that the workpiece receiver (8,) does not interfere with the running rail (9) when the support leg (8a) is lowered.
The workpiece receiver (8,) can be rotated and retracted to the inside 111 of the travel rail (9) by a rotary actuator (8c) attached to the tip of the balance I5!1l (8a),
If the workpiece receiver (8,) is evacuated by turning 11I:I and the support leg (8a) is laid down in good condition, ti+traveling rail (9)
)) The workpiece receiver (8,) is stored in the inner space at a low level, and the workpiece receiver (8,) controls the movement of the exchange cart (4) into and out of the shunting station D and to and from the welding station A. (81) without causing any interference.

Next, the overall operation of the above embodiment will be explained in detail.

During welding work, the automobile body W welded at welding station A is transferred to a transfer fan. - (5) In the reciprocating motion in the extended state, the dispensing station BK is gradually moved through the intermediate station O as described above.

Dispatch from the dispensing station B to the expansion line,
In this case, the automobile body W is transferred from the welding station A by the forward movement of the transfer bar (5), and at the same time the floor Wa, roof WbI and side panel Wc of the car body to be welded next are transferred from the set station behind it by a set cart (not shown). The welding station AK was brought in, and the welding jig (IJ 1) of the automatic welding equipment (2J (2)
Since these parts are delivered to 1) and welded, if the conveyance path (3) is long due to the provision of a switching station D on the way, the delivery cart is moved to the S contact station A as in the past. If the MIC is reciprocated with the dispensing station B, welding will be completed before the dispensing cart returns to the welding station A, resulting in loss time, but the reciprocating stroke of the transfer bar (5) is equal to the reciprocating stroke of the dispensing cart. Since it only takes half the time, it is possible to efficiently transport the vehicle body without incurring the same amount of time.

When replacing the welding jig (1), place an empty replacement cart (4) on the shunting rail aυαp on one side of the shunting station D in advance.
) and the exchange cart (4) carrying the welding jig (υ (υ)) to be used next are placed on standby on the exchange rail 0ηQl) on the other side, and first the first workpiece receiver (8
The supporting legs (81) of 1) are laid down, and the front and rear end portions of the transfer paper (5).

That is, after removing the support members (6) attached to the front part of the Igx par (51) and the rear part of the 1g2 par (52).

#2nd par <s2) Advance the first par (5,) K to bring the transfer bar into a contracted state, and
m) Lance fans - (6) e Move the shunting stay shore D to a slightly forward position. Next, rotate each switching rail (10b) of the switch QQ to the sideways position, and move the shunting rail on the - side. Insert the empty exchange cart (4) from cI or (B) into exchange station D, and remove the joint member (
4d) at the rear end of the transfer bar (5).
5a).

Next, after rotating each core switching rail (10b) to the vertical position, the transformer 7 upper (5) is moved to the welding station A.
Move the exchange trolley (4) back to the side and carry it into the welding station A, and transfer the welding jig (υ (υ) to the exchange trolley (4) for 2 yen) to the automatic welding equipment t2 on both sides. 1. Next, the transfer bar (5) is moved forward to a position in front of the shunting station D, the changing cart (4) is returned to the shunting station D, and each of the switching rails (10b) is placed in a horizontal position. Rotate again.

The exchange cart (4) is sent onto the - side shunting rail αυ (b), and the welding jig to be used next is sent from the other side shunting rail αru (b) to the shunting stay 7 D. (2J) is loaded with the replacement cart (4) loaded with Transfer the welding jig (1) (1) on the trolley (4), and then move the empty exchange trolley (4) to the exchange station DK in the same manner as above. Shunting rail Ql)(
b) Deliver the exchange cart (4) onto the platform.

Next, return the transfer bar (δ) to the extended state, attach support members (6) compatible with the next model to both front and rear ends of the transfer bar (δ), and finally, attach the supporting legs (8a) of the first workpiece receiver (8,).
) to stand up and complete the replacement work.

(Effects of the Invention) As described above, according to the present invention, the exchange cart is carried from the exchange station in the middle of the conveyance path connecting the welding station and the unloading station to the welding station via the core conveyance path, and the welding jig is The replacement work can be done efficiently,
In addition, this is different from the type in which switching rails are provided on both sides of the unloading station, and it is possible to secure a large working space on both sides of the unloading station for transferring the workpiece to a knife, etc., improving work efficiency. Even if the distance between the welding station and the unloading station becomes longer due to the presence of the welding station, the workpiece is transported sequentially from the welding station to the unloading station via the intermediate station using a transfer bar, so there is no loss time in transporting the workpiece. Productivity is improved as the transfer is carried out efficiently and efficiently, and since the exchange trolley is also transported using the transfer bar, there is no need for a separate drive source for transporting one trolley.
This has the effect of reducing equipment costs.

[Brief explanation of the drawing]

Fig. 1 is a plan view of one example of carrying out the present invention, Fig. 2 is a side view taken along the line ■-■ in Fig. 1, Fig. 3 is a front view of the welding station during welding work, and Fig. 4 is a replacement trolley. Fig. 2 is a cutaway side view corresponding to Fig. 2 during transportation, Fig. 45 is a front view of the welding station when the jig is replaced, and Figs.
It is an enlarged cross-sectional view taken along the line ■-■ to the line ■-■ in the figure. A... Welding station B... Unloading station 0... Intermediate station Do... Replacement station 7 (17... Welding jig (22... Automatic welding device (3)... Transport path ( 4)...Exchange trolley (5n...Transferno?-(7)-...Jj Descend e(9)...Traveling rail αQ...Switch aV
... shunting rail low)

Claims (1)

[Claims] 1. Workpieces are welded by an automatic welding device that includes a welding station and a delivery station in front of the welding station, and has welding jigs placed on both sides of the welding station, and the welded workpieces are transferred to the welding station. The welding line is configured to be transported to the welding station via a transport path extending forward from the welding line, wherein an exchange cart on which a welding jig can be mounted is transported to the welding station via the transport path to carry out the automatic welding. In an apparatus in which the welding jig of the apparatus is replaced, a transfer bar is provided in the transfer path, and the reciprocating movement of the transfer bar moves the workpiece from the welding station through an intermediate station provided in the center of the transfer path. A switching station is provided in the middle of the conveyance path for the exchange cart to be sequentially fed to the unloading station, and a change station for the exchange cart extending from the welding station to the exchange station is provided on both sides of the transfer bar arrangement part of the conveyance path. A running rail and a shunting rail for an exchange trolley connected to the running rail via a switch are provided on both sides of the shunting station. A welding line characterized in that an engagement member that engages with the carriage is provided on the transfer bar, and the exchange carriage can be reciprocated between the shunting station and the welding station by movement of the transfer bar. Welding jig replacement device. 2. When the rear end portion of the transfer bar is located at the welding station or the intermediate station, the front end portion thereof can be expanded and contracted into an extended state where it is located at the intermediate station or the dispensing station, and a contracted state where the length is shorter than that. The workpiece is transferred by the reciprocating movement of the transfer bar in the extended state, and the engaging member is attached to the rear end of the transfer bar in the contracted state, and the transfer bar is transferred to the exchange station in the contracted state. A welding jig in a welding line according to claim 1, characterized in that an exchange cart is reciprocated between the two stations by reciprocating from a position further forward toward the welding station. Exchange device.