JP3561820B2 - Lifting device for maintenance of stacker crane - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fall prevention device for a maintenance elevator in a stacker crane for loading and unloading luggage to and from a storage shelf in an automatic warehouse or the like.
[0002]
[Prior art]
A stacker crane for loading and unloading luggage to and from storage shelves in an automatic warehouse or the like is provided with a pair of masts 2 on a traveling body 1 that travels along a storage shelf by a traveling operation mechanism (not shown) as shown in FIG. A carriage 3 for transport is provided so as to be able to move up and down along the line, and a wire 5 to be wound and fed by a winch 4 driven by an electric motor is connected to the carriage 3, and a slide-type fork claw 6 can enter and exit the carriage 3. The carriage 3 is moved up and down to correspond to a predetermined shelf, and the fork claw 6 is moved in and out, and the baggage 7 is stored in and out of the predetermined shelf.
[0003]
In such a stacker crane, the wire 5 that moves up and down the carriage 3 is regularly inspected and maintained. Conventionally, a ladder is attached to the mast 2, and the worker climbs this state to perform inspection and maintenance.
[0004]
As mentioned above, it is very dangerous for a worker to climb a ladder, and the work efficiency of inspection and maintenance is poor. In recent years, a powered lifting device for maintenance has been proposed to improve safety and work efficiency. ing.
[0005]
For example, as shown in FIG. 1, a lifting guide 8 is attached to the mast 2, and a maintenance elevator 9 on which a worker rides is guided along the lifting guide 8 so as to be able to move up and down freely, and a rope 10 connected to the maintenance elevator 9 is connected. The rope 10 is wound and fed by a hoisting machine 11, and the rope 10 is connected to a counterweight 13 via a rope guide 12 so that the winding driving force of the hoisting machine 11 can be reduced.
[0006]
The above-mentioned maintenance elevating device shown in FIG. 1 raises and lowers the maintenance elevator 9 by the hoisting machine 11 provided at the top of the stack crane, and the hoisting machine 11 uses an electric motor as a power source. If the electric motor cannot be driven due to a power failure or the like during the inspection and maintenance work, the maintenance elevator 9 cannot be lowered.
[0007]
For this purpose, a ladder is conventionally installed on the mast 2 of the stacker crane, and the worker can use the ladder to get down to the ground in the emergency.
In addition, a rope or a rope ladder is prepared in advance in the maintenance elevator 9 and the rope or the rope ladder is suspended from the vicinity of the ground in the case of the above-mentioned emergency so that the worker can descend on the ground.
[0008]
[Problems to be solved by the invention]
When the former ladder is used, it is very dangerous because the worker gets off the ladder.
Also, by attaching a heavy steel ladder to the mast of the stacker crane, the stacker crane becomes heavier by the weight of the ladder, and extra power for running the stacker crane is required.
In addition, since the ladder is attached to the mast of the stacker crane, the size of the stacker crane increases, and a compact equipment layout cannot be realized.
[0009]
When the latter rope or rope ladder is used, it is dangerous because the rope or the rope ladder is insufficiently fixed and the worker swings when hitting down and hits the storage shelf or the mast. In addition, a space including a rope and a rope ladder is required in the maintenance elevator, so that the space for the worker to ride is reduced, which adversely affects the operation of the worker.
[0010]
Therefore, an object of the present invention is to provide an elevator for maintenance of a stacker crane which can solve the above-mentioned problem.
[0011]
[Means for Solving the Problems]
According to the present invention, the maintenance elevator 31 is movable up and down along the mast 23 of the stacker crane, and the maintenance elevator 31 is moved up and down by using the electric motor 52 attached to the lower surface of the floor 43 as a power source. 34,
The electric motor 52 has a built-in electromagnetic brake, and the end of the rotating shaft 62 protrudes, and an operation lever 60 for releasing the electromagnetic brake is attached to the electric motor 52,
An opening 63 is formed in a portion of the floor 43 of the maintenance elevator 31 facing the electric motor 52, and the opening 63 is made openable and closable by a cover body 64,
On the back side of the cover body 64, a maintenance lifting device of the stacker crane, characterized in that attaching the universal Naru handle 65 detachably removably to the protruding portion of the rotary shaft 62 in the electric motor 52.
[0012]
[Operation]
In the case of an emergency where power is not supplied to the electric motor 52 due to a power failure or the like, the electromagnetic brake is released by the operation lever 60, the handle 65 is attached to the protruding portion of the rotating shaft 62, and the rotating shaft 62 is rotated by the handle 65, and the maintenance elevator is used. 31 is lowered by the operator.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 2, the stacker crane includes a main body 20, and a traveling wheel 21 is attached to the main body 20, and the traveling wheel 21 is driven to rotate by a driving mechanism (not shown) to travel in the left-right direction along the rail 22. It is like that.
A pair of masts 23 are erected on the main body 20, and the pair of masts 23 are connected by an upper connecting member 24.
[0014]
A transport carriage 25 is provided so as to be able to move up and down along the pair of masts 23. A slide-type fork claw 26 is attached to the carriage 25 so as to be able to enter and exit a storage shelf (not shown). A wire 28 wound and fed by a winch 27 attached to the main body 20 is connected to a carriage 25 via a plurality of pulleys 29 provided on an upper connecting member 24.
[0015]
A control signal is sent to each drive source of the stacker crane from the ground control panel normally provided at the entrance of the warehouse by an optical communication system, and by operating the ground control panel, the stacker crane travels, elevates, fork pawls. It is designed to move in and out.
[0016]
As shown in FIG. 2, an elevating guide 30 is attached to the one mast 23 over the entire length in the longitudinal direction, and a maintenance elevator 31 is guided along the elevating guide 30 so as to be able to ascend and descend. A chain 32 is connected to an upper part and a lower part of the one mast 23, and a lifting drive mechanism 34 is attached to a lower part of the elevator 31.
[0017]
As shown in FIGS. 3 and 4, the elevating guide 30 has a guide rail 42 attached to a U-shaped bracket 40. Guide grooves 42 are formed on both sides of the guide rail 42 in the longitudinal direction. It is.
[0018]
As shown in FIGS. 3 and 4, the maintenance elevator 31 has a space portion 45 in which a cover body 44 is attached to a floor portion 43 and a worker rides on the floor portion 43, and a part of the cover body 44 can be opened and closed. It has become.
[0019]
A guide member 48 is attached to a support column 47 of the cover body 44. As shown in FIG. 4, the guide member 48 has a first roller 50 and a second roller 51 mounted on a bracket 49 mounted on a column 47, and the first roller 50 and the second roller 51 are connected to the guide groove 42 of the guide rail 41. Is in contact with
[0020]
As shown in FIG. 5, the lifting drive mechanism 34 includes an electric motor 52 mounted on the lower surface of the floor 43, and a drive sprocket 54 is driven by a speed reducer 53 provided on the output side of the electric motor 52. An upper guide sprocket 55 and a lower guide sprocket 56 are attached to the floor 43 so as to face the sprocket 54.
[0021]
The drive sprocket 54, the upper guide sprocket 55, and the lower guide sprocket 56 are separated in the left-right direction, and the chain 32 is wound around the upper guide sprocket 55, the drive sprocket 54, and the lower guide sprocket 56 sequentially. As a result, the chain 32 meshes with the teeth of the drive sprocket 54 at substantially half the circumference, and the drive sprocket 54 can drive the chain 32 reliably.
[0022]
Thus, by driving the electric motor 52 and rotating the driving sprocket 54, the maintenance elevator 31 moves up and down along the lifting guide 30.
[0023]
The electric motor 52 has a built-in electromagnetic brake (not shown) that brakes when not energized and is released when energized, and includes an operation lever 60 that manually releases the electromagnetic brake. By operating until the stopper 61 is hit, the electromagnetic brake can be released when power is not supplied.
[0024]
One end of the rotating shaft 62 of the electric motor 52 projects toward the speed reducer 53, the other end projects from the electric motor 52, and the projecting portion 62a is a spline or a prism.
[0025]
An opening 63 is formed in a portion of the floor 43 facing the electric motor 52, and the opening 63 can be opened and closed by a cover 64. A handle 65 is detachably attached to the back surface of the cover body 64, and the handle 65 has a hole 66 that fits into the protrusion 62a of the rotating shaft 62.
[0026]
If power is not supplied to the electric motor 52 due to a power failure or the like during the inspection and maintenance work, the rotating shaft 62 is braked by the electromagnetic brake, and the maintenance elevator 31 stops at that position.
[0027]
In the above-described emergency, the operator riding on the maintenance elevator 31 opens the cover body 64 and fits the hole 66 of the handle 65 into the projection 62a of the rotary shaft 62 to operate the cover 65, as shown in FIGS. The electromagnetic brake is released by operating the lever 60 until it hits the stopper 61.
[0028]
In this state, the operator turns the handle 65 to rotate the rotating shaft 62 and lower the maintenance elevator 31.
[0029]
In the embodiment described above, the maintenance elevator 31 is moved up and down by the drive sprocket 54 and the chain 32. However, the pin-on may be driven by the electric motor 52 to engage with the rack attached to the mast 23 and move up and down.
[0030]
【The invention's effect】
In an emergency, when the power is not supplied to the electric motor 52 due to a power failure or the like, the electromagnetic brake is released by the operation lever 60, the handle 65 is attached to the protruding portion of the rotating shaft 62, and the rotating shaft 62 is rotated by the handle 65 for maintenance. The elevator 31 can be lowered.
Therefore, the worker can safely descend on the ground in an emergency.
Further, since only the operating lever 60 and the handle 65 for releasing the electromagnetic brake of the electric motor 52 are provided, the weight of the stacker crane does not become too heavy, so that no extra power for running the stacker crane is required. The stacker crane does not become large, and the space in the maintenance elevator 31 does not become small, so that the operation of the worker is not adversely affected.
[Brief description of the drawings]
FIG. 1 is a front view of a conventional example.
FIG. 2 is an overall front view showing the embodiment of the present invention.
FIG. 3 is an enlarged front view of a maintenance elevator mounting portion.
FIG. 4 is a sectional view taken along line AA of FIG. 3;
FIG. 5 is an enlarged front view of a lifting drive mechanism.
FIG. 6 is an explanatory diagram of an operation in an emergency.
FIG. 7 is an explanatory diagram of an operation in an emergency.
[Explanation of symbols]
23 mast 30 lifting guide 31 maintenance elevator 32 chain 34 lifting drive mechanism 43 floor 44 guard 45 space 52 electric motor 54 drive sprocket 55 upper guide sprocket 56 lower guide sprocket 60 ... Operation lever 61 ... Stopper 62 ... Rotating shaft 63 ... Opening 64 ... Cover body 65 ... Handle

Claims (1)

The maintenance elevator 31 can be moved up and down along the mast 23 of the stacker crane, and the maintenance elevator 31 is provided with a lifting drive mechanism 34 that moves up and down using an electric motor 52 attached to the lower surface of the floor 43 as a power source.
The electric motor 52 has a built-in electromagnetic brake, and the end of the rotating shaft 62 protrudes, and an operation lever 60 for releasing the electromagnetic brake is attached to the electric motor 52,
An opening 63 is formed in a portion of the floor 43 of the maintenance elevator 31 facing the electric motor 52, and the opening 63 is made openable and closable by a cover body 64,
Wherein the rear surface of the cover body 64, removably maintenance lifting device of the stacker crane, characterized in that attaching the universal Naru handle 65 removably attached to the projecting portion of the rotary shaft 62 in the electric motor 52.

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