JPH0912111A - Lifting device for lift of stacker crane - Google Patents

Abstract

PURPOSE: To set the lifting height of a counter weight at a half of the lifting height of a lift by providing a suspended wheel in a counter weight, and wrapping a hoisting cable, of which one end is fitted to a lift and of which the other end is fitted to an upper part of a stacker crane, around the suspended wheel. CONSTITUTION: A hoisting cable 28A connected to a lift 16 is wrapped around wheels 31, 32, and wrapped around a driving wheel 43. Thereafter, the hoisting cable 28A is wrapped around a hoisting wheel 26 of a counter weight 22, and fixed to a stacker crane 13. A wheel 36 is provided in the stacker crane 13 freely to be rotated forward and backward around an axis center, and a wheel 37 is provided in the stacker crane 13 at a position opposite to the wheel 36 freely to be rotated in the fore and aft direction around the axis center. A motor 45 is operated, and the lift 16 is lifted by a driving wheel 43, and the motor 45 is stopped, and the lift 16 can be stopped at the predetermined position by the braking work. Since a hoisting mechanism of the counter weight 22 is a running block method, the lifting height of the counter weight can be set at 1/2 of the lifting height of the lift 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for a lifting platform of a stacker crane of an automatic warehouse.

[0002]

2. Description of the Related Art Heretofore, the following lifting devices of this kind have been known. That is, a counterweight is provided in a hollow mast so as to be able to move up and down, and a lifting rope whose one end is attached to an elevating table at one end of the counterweight is hung on at least a wheel above the stacker crane, It is known that an elevator is moved up and down by rotating a wheel or a drive wheel on which a hanging rope is hung.

[0003]

Disadvantages of the Prior Art The above-described conventional lifting device for a lift has the following drawbacks. That is, because the vertical height of the counterweight was equal to the vertical height of the lifting platform,
The counterweight must have the same height as that of the lift, but the member that prevents the counterweight from rising and falling may protrude from the bottom of the mast, or the counterweight may be stored in a narrow mast. When the vertical length of the upper counterweight itself becomes longer than the vertical length of the lifting platform, the mast must be raised only to secure the lifting height of the counterweight, that is, the overall height of the stacker crane must be increased. It had the drawback of not becoming.

[0004]

[Means for Solving the Disadvantages] The present invention employs the following means in order to eliminate the above disadvantages. According to the invention of claim 1, a counterweight is provided in a hollow mast so as to be able to move up and down, a lifting wheel is provided on the counterweight, and one end is a lifting rope and the other end is attached to an upper part of a stacker crane. , It is hung on at least the wheel above the stacker crane and the suspension wheel.

[0005]

The first aspect of the present invention has the following functions. Since the lifting height of the counterweight can be set to 1/2 of the lifting height of the lifting table, the lifting height of the counterweight is different from the conventional one, which is the same as the lifting height of the lifting table. It is not necessary to increase the height of the mast, that is, to increase the overall height of the stacker crane, only to secure the height of elevation.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; In this embodiment, the front means the lower side of FIG. 1, the rear means the upper side of FIG. 1, and the left means the left side of FIG.
The right means the right side in the figure.

[0007] A pair of front and rear rack devices 1 are erected on the floor so as to open the stacker crane passage 10. The rack device 1 includes a plurality of front columns 2 arranged side by side at a predetermined interval, a rear column 2 arranged behind the front columns 2 with a predetermined interval therebetween, and front and rear columns 2. And a plurality of article support members 4 provided at predetermined intervals in the height direction, and a pair of left and right article support members 4 opposed to each other without the support pillar 2 interposed therebetween.
Is configured. A space between the pair of left and right article support members 4 is a fork passage gap 5 that allows the slide fork 17 to be described later to move in the vertical direction. The entrances 6 of the article storage shelves 3 of the front and rear rack devices 1 face each other.

A loading / unloading roller conveyor 8 is provided on the left side of the rack device 1 with the transport direction directed to the left and right. Rack device 1 of this loading and unloading roller conveyor 8
A known article elevator (not shown) is provided on the side.
The article elevator includes a lifting platform that can be raised and lowered by a known lifting device below the rollers of the loading and unloading roller conveyor 8,
It has a pair of support frames that are erected on the lift table and are located between the rollers of the entrance and exit roller conveyor 8. The article elevator lifts the article W by the support frame to form a fork insertion gap between the transport surface of the loading / unloading roller conveyor 8 and the lower surface of the article W, or the slide fork 1 by the support frame at the raised position.
The article W is received from the storage 7 and then lowered to drop the article W onto the loading / unloading roller conveyor 8.

A pair of upper and lower guide rails 11 are arranged in the stacker crane passage 10 so that the longitudinal direction thereof is oriented in the left-right direction, and the stacker crane 13 is guided by these guide rails 11 so as to be movable left and right. , This stacker crane 13 has a traveling carriage 14
A lift 16 which can be moved up and down along a pair of masts 15 provided on the traveling vehicle 14 by a lift device 21 which will be described in detail below. And a slide fork 17 slidably provided. As is well known, the slide fork 17 performs an operation of projecting the article W downward and lifting the article W by the elevation of the elevator 16 and retreating to the elevator 16 to draw the article W into the elevator 16. By the operation reverse to the above, the article W can be dropped on the article storage shelf 3 or the like.

The elevating device 21 has a counterweight 22 that is vertically movable in the hollow left mast 15 and a counterweight 22 that is vertically movable in the hollow right mast 15. ing. The counter weight 22 is configured by stacking a required number of weight constituent members.

The counterweight 22 is provided with a required number of guide rollers 23 that come into contact with the inner surface of the mast 15 so that the counterweight 22 can smoothly move up and down within the mast 15. A cushioning material 24 having elasticity is attached to the lower portion of the counterweight 22, while a suspension wheel 26 having an axial center in the front-rear direction is rotatably provided at the center of the upper portion of the counterweight 22 via a bracket 25. ing.

A wheel 31 is provided above the right side of the lift table 16 and is rotatably provided on the upper part of the stacker crane 13 so that its axis is oriented in the front-rear direction. A wheel 32 is rotatably provided on the upper part of the stacker crane 13 at a position facing the right side and facing the same so as to be rotatable with its axis centered in the front-rear direction, and between the wheel 31 and the wheel 32 and slightly from them. Wheels 33, 34 are provided on the upper part of the stacker crane 13 in a form of being located on the lower side.
It is rotatably provided with its axis facing forward and backward.

A bracket 42 is provided on the right side of the lower part of the stacker crane 13 (traveling carriage 14), and a drive wheel 43 is rotatably provided on the bracket 42 so that its axial center is oriented in the front-back direction. The wheel 43 is rotated by a motor 45 that can rotate in the normal and reverse directions.

One end of a suspension rope 28A made of a wire rope or the like is connected to the right side of the lifting table 16, and the suspension rope 2
8A is hung on the wheels 31 and 32, hung on the drive wheel 43, then hung on the wheels 33 and 34, and further hung on the hanging wheel 26 of the right counterweight 22 from below, and then the stacker. It is fixed to the top of the crane 13.

A wheel 36 is rotatably provided on the upper part of the stacker crane 13 so as to be positioned above the left side portion of the elevating table 16 and has its axis oriented in the front-rear direction. A wheel 37 is rotatably provided on the upper part of the stacker crane 13 in a position facing the left side and facing the same so that the axis thereof is oriented in the front-rear direction.

One end of a suspension rope 28B made of a wire rope or the like is connected to the left side of the lifting table 16, and the suspension rope 2
8B is hung on the wheels 36 and 37, and then hung on the suspension wheel 26 of the counterweight 22 on the left side from below, and then fixed to the upper part of the stacker crane 13.

With the above-described structure, the elevator 45 can be moved up and down by operating the motor 45 to rotate the drive wheel 43, while the motor 45 is rotated.
And the brake (not shown) incorporated in the motor 45 is operated to stop the lift table 16 at a predetermined position.

Since the moving pulley system is adopted for the suspension mechanism of the counterweight 22, the counterweight 22
It is possible to make the ascending / descending height of 1/2 of the ascending / descending height of the ascending / descending table 16. And the counterweight 22
Is designed to move up and down at a substantially lower half portion of the hollow mast 15. With such a configuration, for example,
When the mast 15 has to be constructed by vertically connecting two upper and lower mast components, the counterweight 22 passes through the seam by making the seam slightly above half the height of the mast 15. It is possible to ensure smooth lifting and lowering of the counterweight 22 without having to do so.

[0019]

[Modifications and the like] Modifications and the like will be described below. (1) It is possible to omit the counterweight 22 on the left side. (2) The mast 15 is not limited to the square pipe, but may be a round pipe or the like. (3) The number of wheels on the top of the stacker crane 13 is arbitrary.

[0020]

According to the present invention, the following effects can be obtained by the above-described configuration. According to the invention of claim 1, the ascending / descending height of the counterweight can be set to 1/2 of the ascending / descending height of the ascending / descending table, so that the ascending / descending height of the counterweight is equal to the ascending / descending height of the ascending / descending table. Unlike the above, it is not necessary to increase the height of the mast, that is, the overall height of the stacker crane, only to secure the height of the counterweight. According to the second aspect of the present invention, since the counterweight is raised and lowered in the substantially lower half portion of the hollow mast, the conventional counterweight has a vertical height equal to the vertical height of the platform. Compared with, the position of the center of gravity of the stacker crane can be lowered, so that the stacker crane can travel stably and the swing of the mast can be suppressed. According to the invention of claim 3, when only one counterweight is used due to the adoption of the moving pulley system, the counterweight has to be twice as heavy as the conventional weight. Since two counterweights can be used, it is easy to handle the counterweights.

[Brief description of the drawings]

FIG. 1 is a simplified horizontal sectional view with an intermediate omitted, showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line II-II of FIG.

FIG. 3 is an enlarged sectional view of a portion A in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

[Explanation of symbols]

 13 Stacker crane 15 Mast 16 Lifting platform 22 Counterweight 26 Suspending wheel 28A Suspending rope 31 Wheel 32 Wheel 33 Wheel 34 Wheel

Claims (3)

[Claims] A counterweight is provided in a hollow mast so as to be able to move up and down, a hanging wheel is provided on the counterweight, and one end of the hoisting rope is attached to an elevating table and the other end is attached to an upper part of a stacker crane. A lifting device for the lifting platform of the stacker crane that is hung on the wheels above the stacker crane and the suspension wheels. 2. The elevating device for an elevator platform of a stacker crane according to claim 1, wherein the counterweight is configured to be elevated and lowered in a substantially lower half portion of a hollow mast. 3. A pair of left and right hollow masts are provided with counterweights that can be lifted and lowered. Each counterweight is provided with a suspension wheel, and one end is attached to an elevator and the other end is attached to the top of a stacker crane. A lifting device for a lifting platform of a stacker crane in which two suspension ropes are hung on at least the wheel above the stacker crane and the suspension wheel.