JPH0618745Y2 - Jig pallet trolley carrier - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to, for example, a jig pallet trolley transporting device for transporting a vehicle body at regular intervals.

[Conventional technology]

In a body welding line in an automobile production factory, welding work is different depending on each process, and the body welded in the previous process is transferred to a subsequent process by a transfer device and is subjected to predetermined welding. Then, the body welded in the subsequent step is further conveyed to the next step by the conveying device and is subjected to predetermined welding. In this way, when the work in each process is completed, the body is carried to the next process by the carrying device by the preset pitch, and the predetermined work is performed.

Conventionally, there are two methods of carrying the body, and one of them is a method of sequentially carrying the body in a batch by a shuttle transfer provided on an ascending / descending device by a link mechanism or the like. The other is a method in which a welding jig required for assembly is placed on a dolly and the dolly is moved by a drive transfer device while a body is placed on the dolly.

In the former method, the drive transfer device is lifted up in order to take out and transport the body stored in the jig, and then the shuttle bar is transported forward and lifted down in the next process to place the body in the jig. It is necessary to pay. In addition, a mechanism for lifting up and down the weight of the body plus the weight of the drive transfer device is required for each process, and the time for lifting up and down is to be assembled. I was shortening the time.

On the other hand, in the latter method, the jig pallet truck is placed on the rail tracks provided on both sides of the drive transfer device, and the shuttle bar may be horizontally moved forward and backward in order to convey the jig pallet truck. As compared with the former method, a mechanism for lifting up and down the body and the drive transfer device becomes unnecessary. Moreover, since the time required for lift-up and lift-down is not required, the effective time for assembling can be increased, and the takt time for assembling one unit with the body can be shortened accordingly. .

FIG. 4 shows an example of a carrying device for carrying a body (product) by a jig pallet truck. In the figure, reference numeral 1 denotes a jig pallet truck, and a shuttle bar 2 is located below the jig pallet truck 1. A transport claw 4 is attached to the shuttle bar 2 via a rotation support bracket 3. The transfer claw 4 can be engaged with a coupling hole 5 formed in the frame of the jig pallet truck 1. At each step, air cylinders 6 and 7 for engaging or disengaging the transport pawl 4 with the coupling hole 5 are provided. The air cylinders 6 and 7 are fixed to support brackets 8 and 9 arranged on the left and right of the shuttle bar 2, respectively.

5 and 7 show the shuttle bar 2 of FIG. 4 and the supporting unit 30 for supporting it. Shuttle bar 2
Is composed of a plurality of square pipes 21 each having a quadrangular cross section joined together as shown in the figure. One square pipe 21
A convex bracket 22 is fixed to the end of the square pipe, and a concave bracket 23 is fixed to the end of the other square pipe 21. The bracket 22 and the bracket 23 are fastened in a state where the convex portion is inserted in the concave portion, and thus the considerably long shuttle bar 2 is formed. This long shuttle bar 2 is movably supported in the longitudinal direction by one or two supporting units 30 arranged for each process.

The support unit 30 has a frame 11 fixed to the floor, and a plurality of cam followers (guide rollers) 12, 13, 14 are attached to the frame 11. Of these, the cam followers 12 are rollers that regulate the upper surface of the shuttle bar 2, and four rollers are attached to the frame 11. The cam followers 13 regulate the side surfaces of the shuttle bar 2, and two cam followers 13 are arranged on each of the left and right side surfaces.
Similarly, four cam followers 14 regulate the lower surface of the shuttle bar 2, and four cam followers 14 are attached to the frame 11.

Shuttle bar 2 movably supported by support unit 30
Is connected to a traveling drive means (not shown), and is reciprocated by the driving force of the traveling drive means.

[Problems to be solved by the device]

However, the shuttle bar support structure shown in FIGS. 5 and 7 has the following problems. In this structure, since the four surfaces of the shuttle bar are required to contact each other uniformly by a large number of cam followers, it is necessary to ensure the straightness of the shuttle bar and the flatness of the four surfaces. Since it is constructed by welding or the like, it was practically difficult to secure the desired accuracy. That is, since the brackets 22 and 23 used for connecting the shuttle bars are welded to the square pipe 21, it is necessary to correct the welding distortion accompanying this using a firearm (burner) on the surface plate. However, there is a problem in that the desired accuracy cannot be obtained although the correction work requires a lot of time. Further, since the plate thickness of the square pipe does not become so thick, it is impossible to perform machining to obtain straightness.

Therefore, during assembly, it is necessary to finely adjust the cam follower that holds the shuttle bar according to the finished state of the shuttle bar, and in daily maintenance, the cam follower is damaged or unevenly worn due to fluctuating load caused by the straightness of the shuttle bar. It was necessary to constantly check whether or not

As described above, the conventional shuttle bar support structure requires a lot of time for manufacturing, assembling, and adjusting work, and frequently replaces consumable parts even in daily maintenance, which is problematic in maintenance management.

An object of the present invention is to provide a carrier device for a jig pallet truck which is easy to manufacture, assemble and adjust, and is easy to maintain and pay attention to the above problems.

[Means for Solving the Problems]

According to the present invention, there is provided a jig pallet trolley carrier carrying device, in which a jig pallet trolley on which a product is mounted and a shuttle bar which is reciprocated by a traveling drive means are attached to the shuttle bar. In a transfer device for sequentially moving the jig pallet carriage in a fixed direction by engaging or disengaging via a rail, two linearly extending rails are fixed to a support block at a predetermined interval, A shuttle movably supported by the rail via a wheel having a guide portion is arranged above the support block, and the shuttle is provided with a stopper that prevents the wheel from being lifted up by engaging with the rail. In addition, the shuttle bar is supported.

[Action]

In the jig pallet trolley carrier thus configured, the shuttle is movably supported by the two linear rails fixed to the support block via the wheels having the guide portions. That is, the shuttle can run along the rail like a bogie of a railway vehicle. In this case, since the shuttle is provided with the stopper, the lifting of the wheel from the rail is prevented. Further, since the wheel has the guide portion, the wheel does not come off from the rail, which restricts the movement of the shuttle in the vertical and horizontal directions. This has the same function as the conventional shuttle bar was regulated by the cam follower.

In this way, the shuttle bar that can be engaged with the jig pallet is supported by the shuttle that can travel back and forth on the rails.
Straightness is not required for the shuttle bar. Therefore, the work of correcting the shuttle bar is also unnecessary, and the time required for manufacturing, assembling, and adjusting can be greatly reduced.

In addition, since the wheels roll on the rails and are functionally the same as the wheels for general rail vehicles, they are less frequently replaced than cam followers that are subject to fluctuating loads as in conventional devices, and maintenance is less frequent. Management is also easy.

〔Example〕

A preferred embodiment of a jig pallet truck carrier according to the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention. In the figure, 31 indicates a jig pallet truck on which a product (body) not shown is mounted. Jig pallet truck 31
A positioning jig (not shown) for positioning the body at a predetermined position is attached to the. Jig pallet truck 31
Is adapted to travel on a road surface (not shown).

A pit (groove) extending in the traveling direction of the trolley is provided on the traveling road surface on which the jig pallet trolley 31 travels, and support blocks 32 are arranged in the groove at appropriate intervals. The support block 32 is fixed to the bottom surface of the groove via anchor bolts 33. Both ends of the support block 32 extend upward, and notches 32a are formed inside the tops of both ends. In each notch 32a of the support block 32, a rail 34 extending linearly and having a circular cross section is arranged. On both sides of the support block 32, bolts 35
, And the bolt 35 is screwed to the rail 34. That is, the rail 34 is positioned at a predetermined position by tightening the bolt 35 and the support block
It is designed to be fixed at 32. Therefore, if the distance between the left and right cutout portions 32a of the support block 32 is accurately processed, it is not necessary to adjust the position of the distance between the left and right rails 34.

In this embodiment, the rail 34 is composed of, for example, a commercially available polished round bar, but may be composed of a general steel bar machined.

A shuttle 40 is arranged between the two rails 34. The shuttle 40 has wheels 41 that are rotatable left and right. The outer peripheral surface of the wheel 41 is an arcuate groove whose shape substantially matches the cross-sectional shape of the rail 34. In other words, both widthwise end portions of the wheel 41 have guide portions 41a that bulge outward in the radial direction.
And this portion acts as a guide function for the rail 34. The wheels 41 roll on the rails 34, whereby the shuttle 40 is reciprocally supported along the rails 34.

A stopper 45 is provided on the lower surface of the shuttle 40.
The stopper 45 is fastened to the shuttle 40 via a bolt 46, and the left and right ends of the stopper 45 extend obliquely downward. The left and right ends of the stopper 45 have rails 34
It is located near the lower surface of. Therefore, when the wheel 41 slightly floats from the rail 34, the end of the stopper 45 engages with the rail 34, and the wheel 41 is prevented from rising.

A plurality of shuttles 40 are arranged on the rail 34 at appropriate intervals, and each shuttle 40 is connected via a shuttle bar 50 formed of a square pipe. Each shuttle bar 50
A connecting plate 51 is joined to both ends of the connecting plate 51, and the connecting plate 51 and a connecting plate 55 joined to the end surface of the shuttle 40 are connected via bolts.
As a result, each shuttle 40 and each shuttle bar 50 are integrated.

The shuttle bar 50 integrated with the shuttle 40 is connected to the traveling drive means 60. The traveling drive means 60 reciprocates each shuttle 40 and each shuttle bar 50,
It is arranged adjacent to the shuttle bar 50 located at the end.

In the present embodiment, although not shown, each shuttle bar 50
As shown in FIG. 4, there is provided a conveying pawl as an engaging means capable of engaging with the jig pallet carriage 31, and the conveying pawl is operated by an air cylinder or the like provided on the groove side. It is supposed to be done.

Next, the operation of the above-mentioned jig pallet truck transfer device will be described.

When the body mounted on the jig pallet truck 31 is transported to a predetermined process, the body is accurately positioned in the process, and welding is performed at a preset location by a robot or the like. When the welding operation in each step is completed, each shuttle bar 50 supported by each shuttle 40 is moved forward by the traveling drive means 60. In this case, the shuttle bar
The transfer claw (not shown) attached to 50 is a jig pallet truck
Since the jig pallet truck 31 is engaged with the jig 31, the jig pallet truck 31 is advanced as the shuttle bar 50 moves.

Here, when the shuttle bar 50 is pulled by the traveling drive means, the wheels 41 roll on the rails 34,
Since the wheel 41 is provided with the guide portion 41a that swells in the radial direction, the movement of the shuttle 40 in the direction perpendicular to the traveling direction is restricted. In addition, since the shuttle 40 is provided with a stopper 45 that prevents the wheels 41 from rising,
The vertical movement of 40 is also restricted. In this way, the shuttle 40 moves along the rails 34 while the movement in the vertical and horizontal directions is restricted, so that the shuttle bar 50 supported by the shuttle 40 also linearly reciprocates without swinging in the vertical and horizontal directions.

When the traveling drive means 60 moves by a predetermined stroke, the jig pallet truck 31 is transported to the next process, and the jig pallet truck 31 is moved.
Is stopped in place. When the jig pallet truck 31 is stopped, the conveyance claws (not shown) provided on the shuttle bar 50 are disengaged from the jig pallet truck 31, and the shuttle 40 and the shuttle bar 50 are driven by the traveling drive means 60. Returned to previous position.

When the shuttle 40 and the shuttle bar 50 are returned to the predetermined positions, the newly conveyed jig pallet truck 31 and the conveying claw are engaged, and the waiting state is entered.

[Effect of device]

As described above, when the jig pallet truck carrier according to the present invention is used, two linearly extending rails are fixed to a support block at a predetermined interval, and a guide portion is provided above the support block. A shuttle that is movably supported by rails via wheels that it has is arranged, and this shuttle is provided with a stopper that prevents the wheels from rising due to engagement with the rails, and that engages with a jig pallet truck. Since the shuttle bar to which the means is attached is supported, the accuracy of the straightness of the shuttle bar is
There is no particular problem as in the conventional structure. That is,
Since it is not necessary to secure the flatness of the four surfaces of the shuttle bar as in the conventional structure, manufacturing, assembling and adjusting work are facilitated, and the number of man-hours required for this can be greatly reduced.

Also, since the load acting on the shuttle wheels is almost constant, the frequency of replacement is low and the maintenance management is easy, unlike the cam followers that receive fluctuating loads due to the straightness of the shuttle bar as in conventional devices. Become.

Furthermore, since it was difficult to improve the accuracy of the straightness of the shuttle bar with the conventional device, the shuttle bar wobbling caused an impact noise due to the shuttle bar and the cam follower. Since they are in constant contact, no impact noise is generated and the working environment is improved.

[Brief description of drawings]

1 is a cross-sectional view of a jig pallet truck carrier according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is a conventional jig pallet. Sectional drawing which shows an example of the conveyance apparatus of a trolley | bogie, FIG. 5 is a top view of the support unit which supports the shuttle bar in the apparatus of FIG. 4, FIG. 6 is the front view of FIG. 5, FIG. 7 is FIG. Is a side view of. 31 …… Jig pallet trolley 32 …… Support block 34 …… Rail 40 …… Shuttle 41 …… Wheel 41a …… Guide part 45 …… Stopper 50 …… Shuttle bar 60 …… Travel drive means

Claims (1)

[Scope of utility model registration request] 1. A jig pallet truck on which a product is mounted and a shuttle bar reciprocated by a traveling drive means are engaged or disengaged via an engaging means attached to the shuttle bar. Thus, in the transfer device for sequentially moving the jig pallet truck in a fixed direction, the two linearly extending rails are fixed to the support block at a predetermined interval, and the wheel having the guide portion is provided above the support block. A shuttle that is movably supported by the rail via the rail is disposed, and a stopper that prevents the wheel from rising due to engagement with the rail is provided on the shuttle, and the shuttle bar is supported. A jig pallet trolley carrier device.