JPS63303623A - Hoist gear - Google Patents

Abstract

PURPOSE:To smoothly lift an article of its own and to safely lower it without dropping it by fitting a drive source to give a limited torque to a hoisting drum and another drive source to reverse this drive source with the hoisting drum. CONSTITUTION:When a wire 26 comes in contact with any of four sensors 25a-25d air cylinders 14, 15 are operated to move a hoist gear 20 and to drop a wire 26 vertically from a hoisting drum 24 toward a plate material 11. Then, when an upper die 10 is lowered by the action of a cylinder 6 to bend the plate material 11, the right part of the plate material 11 is sprung up and the drum 24 hoists the wire 26 as the plate material is sprung up. A clamp 27 moves leftward and the hoist gear 20 is moved leftward by the sensor 25. When the plate material 11 is bent by a prescribed angle, the supply of compressed air to a motor 23 is stopped, a motor 21 is driven lifting the upper die 10, the air motor 23 is rotated with a casing to reverse the hoist drum 24 and the wire 26 is paid out.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a 9-winding device, and in particular, it is capable of hoisting up a hoisted object by following the rise of the hoisted object itself and safely lowering the hoisted object without causing it to fall. This invention relates to a new hoisting device.

[Background of the invention and its problems]

In the bending press, the plate material is placed on a concave lower mold.

The part of the material that overhangs the bent part will spring up.

This springing up of the plate is not a problem if the amount of overhang from the bent part to the end of the plate is short, but if it extends from 1% to a few percent, the amount of springing up becomes large and the upper mold is opened after bending. When this occurs, the part that has been sprung may fall, which is dangerous.

If the plate material is relatively thin and has a long overhang, the plate material may bend at the bottom or in the middle, making it impossible to get a clean finish.Furthermore, the plate material may move due to falling of the raised part, so automatic conveyance of the plate material is not recommended. There were problems such as difficulty in automating the folding work involved.

The present invention allows the object itself to rise smoothly, such as the above-mentioned lifting of the board, without causing it to fall.
The object is to provide a hoisting device that can be lowered safely.

[Means for solving problems]

The present invention includes a zero hoisting drum, a first drive source that provides a forward rotation driving force of a limited torque to the hoisting drum, and a one-way locking means for preventing the hoisting drum from being reversed with respect to the first drive source. The hoisting device comprises a second drive source connected to the first drive source via a worm-worm wheel type speed reducer for rotating the first drive source in reverse together with the hoist drum.

[For production]

In the hoisting device of the present invention, the first drive source applies normal rotation driving force of a limited torque to the hoisting drum, and the hoisted object is raised by the sum of the two lifting forces of the hoisted object itself.

The lifted hoist is prevented from falling by the one-way locking means and is lowered only by the second drive source. So 2
For example, if the above-mentioned overhanging part of the board is hoisted up by this device and the normal rotation torque is set within the range of force necessary for supplementary support of the overhang, it is possible to avoid applying excessive force to the board. The board can be bent in a natural state without any problems, there is no risk of it falling, and the board can be smoothly lowered after bending.

〔Example〕

1 and 2 showing one embodiment of the present invention will be explained below.

1 is a main body of a bending press to which the winding device of the present invention is applied, and a lower mold 8 is attached to a lower mold holder 2. The main body l is provided with a guide 4 that extends vertically.

A slider 5 is attached to be movable up and down. The slider 5 is connected to a piston rod 7 of a cylinder 6 attached to the upper part of the main body 1. 8 is a lock nut.

An upper die mounting arm 9 is attached to the slider 5.
An upper mold 10 is attached to the lower end of this upper mold mounting arm 9. The lower die 8 has a V-shaped groove extending in a direction perpendicular to the paper plane of FIG.

The upper mold lO has a chevron shape that pairs with the V-shaped groove, and the plate material 11 placed between them is bent as shown by the two-dot chain line.

Left and right rails 12 extending horizontally are provided on the upper front side of the main body l, and front and rear rails 18 are attached to these so as to be movable left and right (in a direction perpendicular to the plane of the drawing).

Note that two front and rear rails 18 are provided in parallel and are moved by a drive device such as a wire-driven air cylinder 14 or the like. A saddle 20A of a hoisting device 20 is attached to the front and rear rails 18 and 14, respectively, so as to be movable back and forth by a wire-driven air cylinder 15.

The hoisting device 20 includes a lowering motor (second drive source) 21
A first drive source 28 for hoisting is attached to the output shaft of this motor 21 via a worm-worm wheel type reduction gear 22. The first drive source 28 is configured to limit the output torque to a value as will be described later, and it is preferable to use, for example, an air motor that can easily limit the torque. Below cylinder 1. The drive source 28 will be explained as an air motor. A hoisting drum 24 is attached to the output shaft of the air motor 28. A wire 26 is suspended from the winding drum 24 through a sensor 25.
A clamp 27 is attached to the tip of 6. wire 2
6 hangs down from the winding devices 2o provided on the left and right sides, respectively, and is folded, preferably on the right side of the center or on both sides of the right end of the bent part of the plate material 11 in the part that extends to the right in FIG. They are connected by clamps 27, respectively.

As shown in FIG. 2, the sensor 25 has four sensors 25a to 25d surrounding a wire 26, and when the wire 26 comes into contact with these, the air cylinder 14 or 15e is actuated and the wire 26 is connected to each sensor. The hoisting device 20 is configured to move so as to hang down substantially vertically without touching any of the windings 25a to 25d.

The air motor 23 is connected to the saddle 20 of the hoisting device 20.
It is operated by compressed air supplied through a pipe 81 that passes through the center of the hoisting drum 24 from the air hose 3o through a rotary joint 29 attached to A via a bracket 28, and drives the hoisting drum 24 with a predetermined torque. It is supposed to be done.

The output torque of the air motor 28 is
1 is not lifted up, but is set to a value necessary to wind up the wire 26 as the plate 11 is bent and sprung up by both dies 8 and 10.

Further, the ratchet wheel 32 and a pawl 88 attached to the casing side of the air motor 28 are attached to the hoisting drum 24.
A one-way locking means is provided.

Unless this one-way locking means is released, the output shaft of the air motor 23 and the hoisting drum 15 will not reverse rotation, that is, the wire 26 will not be let out downward. In addition, in FIG. 1, 84 is a support for the plate material 11.

Next, the operation of this device will be explained. first.

The plate material 11 is placed in a predetermined position above the lower mold 8 and the support 84. Then, the clamps 27 at the ends of the wires 26 are attached to both sides of the plate material 11, as shown in FIG.

Compressed air is then supplied to the air motor 28.

Since the air motor 28 does not have the power to lift the plate material 11 with its own output, the plate material 11 is fixed to the lower die 8 and the sensor 25 is activated accordingly.
When the wire 26 does not hang vertically from the winding drum 24 and comes into contact with any of the four sensors 25a to 25d, the air cylinder 1 is moved to release the contact.
4.15 is activated to move the hoisting device 20, and the wire 26 is suspended approximately vertically from the hoisting drum 24 toward the plate material 11. Note that the movement of the hoisting device 20 in the width direction of the plate material 11, that is, the movement of the front and rear rails 18, may be performed manually to match the width of the plate material 11 without using the sensor 25 and the air cylinder 14.

Next, operate the cylinder 6 of the bending press to
is lowered and the plate material 11 is bent. Along with this bending, the right portion of the plate material 11, which is long overhanging in FIG. 1, is flipped up. The winding drum 24 winds up the wire 26 as the plate material 11 springs up 9. At this time,
What is the driving force of the air motor 28?

It has the function of preventing the rightward projecting portion of the plate material 11 from sagging significantly and preventing unnecessary bending of the plate material 11, such as being bent at the edge of the lower die 8, for example.

As the plate material 11 springs up, the clamp 27
In the figure, the wire 26 moves to the left and begins to hang diagonally, but this is detected by the system 25,
This is corrected by moving the hoisting device 20 to the left using the air cylinder 15.

After the plate material 11 is bent at a predetermined angle as shown by the two-dot chain line, the supply of compressed air to the air motor 28 is stopped. At this time, since the winding drum 24 is prevented from reversing by the pawl 88 and the ratchet wheel 82, the plate material 11 remains in the sprung position.

Next, the motor 21 is operated while the upper mold 10 is raised by the cylinder 6 of the bending press, and the air motor 28 is rotated together with its casing via the worm/worm wheel type reducer 22 to reverse the winding drum 24. , the wire 26 is let out, and the raised right part of the plate material 11 is lowered to the top of the support 84 at a predetermined speed that is not dangerous.

In the embodiment described above, the clamp 27 was used as a means for connecting the wire 26 to the plate 11.

Not limited to this, various connection means such as a vacuum suction type or a magnetic attraction type can be adopted, and only one hoisting device 20 is installed at the center of the width direction of the plate material 11, and the center of the width direction is There is no need to use a long clamp to suck and lift only the pieces, or to use a long clamp that is passed between both sides of the plate material 110 and clamps both sides.

〔Effect of the invention〕

As described above, the hoisting device of the present invention is capable of safely lowering two hoisted objects without causing them to fall, and is thus useful as a means for supporting the sprung up portion of a plate material that is to be bent. 9 It has various utility values.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is an enlarged plan view of the sensor. 8...Lower mold, 10...Upper mold, 11...Plate material,
12... Left and right rails 18... Front and rear rails, 20...
- Hoisting device, 21... Second drive source, 22... Reducer, 28... First drive source, 24... Hoisting drum, 25... Sensor, 26... Wire, 29... ...rotary join), 32.88...one-way locking means.

Claims (1)

[Claims] a hoisting drum, a first drive source that provides a forward rotation driving force of a limited torque to the hoisting drum, a one-way locking means for preventing the hoisting drum from reversing with respect to the first drive source, and the first drive source. A hoisting device comprising a second drive source connected to the drive source via a worm-worm wheel type speed reducer and configured to reverse the first drive source together with the hoist drum.