JP3214034B2 - Transport device for large plate-shaped work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport device for transporting a large plate-shaped work with high precision used in the fields of shipbuilding, bridges and the like.

[0002]

2. Description of the Related Art In general, a conveyor system and a bogie system are known as systems for conveying a work (transported object). In the conveyor system, a work is placed on a conveyor (belt conveyor, apron conveyor, or the like), and the conveyor is driven to convey the work. In the trolley system, a workpiece is placed on a trolley, and the trolley is moved to transport the workpiece.

In the field of shipbuilding, bridges, etc., it is desired to accurately transport a "skin plate with a long pipe attached to a skin plate" as a bottom plate of a ship, and a "bridge with a rib attached to a bridge girder" as a bridge girder. There is a request. That is, there is a demand for accurately transporting a large plate-shaped work in which a plurality of reinforcing members (longitudes and ribs) are temporarily fixed in parallel to a plate material (skin plate or bridge girder plate).

[0004] This is for automatically welding the plate material and the reinforcing member. For the automatic welding, an automatic steel plate panel welding apparatus disclosed in Japanese Patent Application No. 3-281570 previously proposed by the present applicant is used.

[0005]

However, when such a large plate-shaped work is conveyed with high accuracy, the use of a conveyor system is inexpensive but has speed fluctuations and poor positioning accuracy. is there.

On the other hand, in the case of using the bogie system, the positioning accuracy can be certainly improved by increasing the assembling accuracy of the bogie and its guide rail. Straightness ± 0.2
) Is difficult to achieve because the work is large and heavy (about 40 tons).

That is, when a work having its own weight of 40 tons is placed on a carriage and transported, a positioning accuracy of straightness of ± 0.2 is required because an excessive load is applied to the carriage and the carriage and its guide rails are required. It is extremely difficult in terms of assembly processing accuracy.

[0008] Even if this is possible, the cost of assembling the bogie and the guide rail increases, and it becomes very expensive.

SUMMARY OF THE INVENTION An object of the present invention, which has been made in view of the above circumstances, is to provide an inexpensive high-precision transfer device for a large plate-shaped work, which can accurately transfer a large plate-shaped work.

[0010]

In order to achieve the above object, the present invention provides a roller conveyor provided along a conveying path, for conveying a large plate-shaped work while supporting its own weight,
A carriage disposed on the side of the roller conveyor and self-propelled along the conveyance path, and an edge of the work provided on the carriage,
The stopper to be abutted and the roller conveyor
Move the workpiece to press it against the stopper.
A side pusher to be provided, a clamp provided on the carriage, for gripping an edge of the work, a floating mechanism provided between the clamp and the carriage, and supporting the clamp vertically movable on the carriage. And a control unit for synchronously operating the roller conveyor and the cart.

[0011]

According to the above construction, the large plate-shaped work placed on the roller conveyor is supported by the support provided on the roller conveyor.
Push the stopper on the truck by the id pusher
It is applied and positioned, and its edge is gripped by the clamping means of the truck . The work is conveyed by the drive of the roller conveyor and the self-propelled carriage by the control unit operating the roller conveyor and the carriage synchronously in that state .

Since the clamping means is vertically movable with respect to the carriage by the floating mechanism, the own weight of the work is not directly applied to the carriage. Ma
In addition, the trolley and roller conveyor are operated synchronously by the control unit.
Is not applied to the bogie,
No. As described above, since no load is applied to the carriage, the accuracy of assembling the carriage and its guide rails can be improved, and the positioning accuracy of the work can be improved.

[0013]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1A is a plan view of the transfer device 1 and FIG.
(b) shows the side view. This transport device 1 is a "skin plate with a longge attached" which is a bottom plate of a ship.
(Hereinafter, referred to as a work 2) with high accuracy.

As shown in the figure, a roller conveyor 4 is provided along a conveying path 3 of a work 2 shown by cross hatching. The roller conveyor 4 is connected by a chain 5 for each predetermined span, and is driven by a drive motor 6 for each span. The work 2 is placed on the roller conveyor 4 with its skin plate facing down and the longitudinal face up. Specifically, the work 2 has a thickness of 6 to 40 mm, a width of 1 to 5 m, and a length of 10 to 2
It is composed of a skin plate of about 5 m and five longes (T-shaped members) attached in parallel on the skin plate, and has a total weight of about 40 tons.

On one side of the roller conveyor 4, a carriage 7 that moves along the transport path 3 is provided. This carriage 7 is configured by connecting five to six vehicles 8 in series, and as shown in FIG. 2, each vehicle 7 engages with a guide rail 9 laid along the transport path 3. To move. That is, the engagement portions 10 that engage with the guide rails 9 are provided on the bottom surface of each vehicle 8 as shown in FIG. A linear motion bearing mechanism is used for the engaging portions 10 so that the carriage 7 moves extremely accurately and lightly with respect to the guide rail 9.

The leading vehicle 8 of the truck 7 is provided with a truck drive motor 11. The motor 11 is mounted such that the rotation axis is perpendicular to the ground, and a pinion 12 is provided at the tip of the rotation axis. The pinion 12 meshes with a rack 13 provided on the ground side along the guide rail 9. According to this configuration, when the bogie drive motor 11 is operated, the pinion 12 meshing with the rack 13 rotates, and the bogie 7 moves along the guide rail 9.

Each vehicle 8 of the carriage 7 is provided with a clamp means 14 for gripping an edge of the work 2 placed on the roller conveyor 4. The clamping means 1
4 is an upper nail 15 and a lower nail 16 as shown in FIGS. 4 (a), 4 (b) and 4 (c).
And the work 2 is sandwiched between them. The upper pawl 15 and the lower pawl 16 are connected via a hydraulic cylinder 17. The hydraulic cylinder 17 is arranged in a triangular shape, the cylinder side 17a of which is fixed to the lower pawl 16 and the piston side 17a.
b is fixed to the upper nail 15. According to this configuration, by expanding and contracting the hydraulic cylinder 17, the upper pawl 15
The lower claw 16 approaches and separates from each other, and the work 2 is gripped and released between them.

Further, side walls 18 are attached to the clamp means 14 in three directions except the direction in which the work 2 is gripped. These side walls 18 are fixed to members on the cylinder side 17a of the hydraulic cylinder 17 (members on the lower pawl side 16). That is, the upper claw 15 moves vertically with respect to the side wall 18.

Each of these side walls 18 is attached to the carriage 7 via a floating mechanism 19, and is movable in the vertical direction with respect to the carriage 7. The floating mechanism 19 is connected to the side wall 18 of the clamping means 14.
A guide rail 20 attached to the upper and lower sides, and an engaging portion 2 which engages with the guide rail 20 and relatively moves.
1 and a support bracket 22 provided on the carriage 7 to fix the engaging portion 21. In addition, a linear motion bearing mechanism is used for the engagement portion 21, and the clamp means 14 can move with extremely high precision and lightness relative to the carriage 7.

According to this configuration, the clamp means 14 for gripping the work 2 moves freely in the vertical direction with respect to the carriage 7, so that if the work 2 is gripped while the clamp means 14 is floating, the work 2 Load is floating mechanism 14
And is not transmitted to the carriage 7.

As shown in FIG. 3, the carriage 7 is provided with a stopper 23 for each vehicle 8. A side end surface of the work 2 slid by a side pusher described later in a direction perpendicular to the conveying direction is brought into contact with the stopper 23. Thereby, the work 2 is positioned in the width direction. The stopper 23 includes a shaft 24 fixed on the carriage 7 as shown in FIG. 5, and a rotating body 25 rotatably mounted on the shaft 24 via a bearing. In addition, this stopper 23
The position is finely adjusted by loosening the fixing bolt 26 and rotating the feed screw 27.

As shown in FIG. 1, the roller conveyor 4 is provided with a side pusher 28 for slidably moving the work 2 placed on the conveyor 4 to the carriage 7. The side pusher 28 is disposed between the rollers of the roller conveyor 4 as shown in FIG. The side pusher 28 includes a hook member 29 for hooking one end surface of the work 2, a slit 30 for guiding the hook member 29 in the width direction of the conveyor 4, and a moving device 31 for moving the hook member 29 along the slit 30. It is composed of The moving device 31 includes a slit 30
, Two sprockets 32 disposed below the ends of the sprockets, a chain 33 wound around the sprockets 32, and a drive motor 34 for driving the chain 33 to rotate. 29 is fixed.

According to this structure, the drive motor 34 is operated to rotate the chain 33 so that the hook member 29
Is guided in the slit 30 and moves in the width direction of the conveyor 4. If the drive motor 34 is reversed, the moving direction of the hook member 29 is, of course, reversed.

As shown in FIG. 1, the drive motor 11 for the carriage 7 and the drive motor 6 for the roller conveyor 4
Is connected to the control unit 35, and the synchronous operation is controlled by the control unit 35. That is,
The traveling speed of the work 2 by driving the roller conveyor 4 and the traveling speed of the work 2 by the self-propelled carriage 7 match. The moving workpiece 2 is welded by an automatic welding machine 36 provided on the conveyor 4 while the skin plate and the longge are moving.

The operation of the present embodiment having the above configuration will be described.

The work 2 placed on the roller conveyor 4 shown in FIG. 1 is conveyed from right to left in the figure by the control unit 35 operating the motor 6 for driving the conveyor 4. When the conveyed work 2 approaches the automatic welding machine 36 to a predetermined distance, the control unit 35 once stops the motor 6 for driving the conveyor 4.

Next, the controller 35 operates the motor 31 for driving the side pusher 28. Thereby, work 2
Is slid toward the carriage 7 in the width direction of the conveyor 4, and the side end surface of the work 2 contacts the stopper 23 on the carriage 7.
As a result, the work 2 is positioned in the width direction. At this time, the edge of the work 2 is inserted between the upper claws 15 and the lower claws 16 of the clamp means 14 provided on the carriage 7 (see FIG. 4).

Next, the control section 35 operates the hydraulic cylinder 17 of the clamping means 14 provided on the carriage 7 to bring the upper pawl 15 and the lower pawl 16 close to each other. Work 2
The edges of the clamp means 14 have upper claws 15 and lower claws 16.
Thus, the positioning accuracy in the width direction is secured.

Next, the control unit 35 controls the drive motor 11 of the carriage 7 and the drive motor 6 of the roller conveyor 4 in a synchronous manner. At this time, the control unit 35 controls the motors 6 and 6 so that the traveling speed of the work 2 by the drive of the roller conveyor 4 and the traveling speed of the work 2 by the self-propelled carriage 7 match.
11 is operated and controlled. As a result, the work 2 is conveyed to the automatic welding machine side 36 while maintaining high positioning accuracy in the width direction, and the skin plate and the longe are sequentially welded in the welding machine 36 in the longitudinal direction.

Here, as shown in FIG. 4, the clamping means 14 is vertically movable with respect to the carriage 7 by the floating mechanism 19, so that the weight of the work 2 is not directly applied to the carriage. That is, all of the weight of the work 2 is added to the roller conveyor 4 and no excessive force is applied to the carriage 7 . The cart 7 and the roller conveyor 4 are controlled.
Since the driving is performed synchronously by the unit 35,
No load is added. Therefore, the assembling accuracy of the cart 7 and its guide rail 9 can be increased at low cost. As a result, the work 2 gripped by the clamping means 14
Can be improved in positioning accuracy.

[0032]

As described above, according to the present invention, an excellent effect that a large plate-shaped work can be transported with high accuracy and the entire apparatus can be constructed at low cost is exhibited.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall view of an apparatus for transporting a large plate-like work, showing one embodiment of the present invention, wherein FIG.

FIG. 2 is a cross-sectional view of the transfer device cut at right angles to a transfer path.

FIG. 3 is a three-view drawing showing a carriage of the transfer device, and FIG.
Is a side view, (b) is a cross-sectional view, and (c) is a plan view.

FIGS. 4A and 4B are three views showing a clamping means and a floating mechanism of the transfer device, wherein FIG. 4A is a plan view, FIG. 4B is a cross-sectional view, and FIG.

FIG. 5 is a cross-sectional view showing a stopper of the transfer device.

FIG. 6 is a two-sided view showing a side pusher of the transfer device, wherein (a) is a plan view and (b) a cross-sectional view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Conveying apparatus 2 Work 3 Conveying path 4 Roller conveyor 7 Cartridge 14 Clamping means 19 Floating mechanism 23 Stopper 28 Side pusher 35 Control part

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23K 37/00 B65G 47/88

Claims (1)

(57) [Claims] 1. A roller conveyor provided along a transport path and transporting a large plate-shaped work while supporting its own weight, and a bogie arranged on a side of the roller conveyor and running along the transport path. And an edge of the work provided on the carriage.
The stopper is provided on the roller conveyor.
Moved to press the work against the stopper
A side pusher to be provided, a clamp provided on the carriage, for gripping an edge of the workpiece, a floating mechanism provided between the clamp and the carriage, and supporting the clamp vertically movable on the carriage. And a controller for synchronously operating the roller conveyor and the cart.