JP2000219304A - Lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the capacity and power consumption of a lifting electric motor by mutually connecting the upper parts and lower parts of a lifting body and balance weight 3 rising and falling along a mast by an upper rope and a lower rope, and laying the upper rope and the lower rope around a sheave in the mast upper part and around a lifting drum in the mast lower part, respectively. SOLUTION: The upper parts and lower parts of a lifting body 2 for loading a cassette 10 and balance weight 3 which rise and fall with correlation along the mast 1 of a stacker crane are mutually connected by an upper rope 7 and a lower rope 9, respectively. The upper rope 7 and the lower rope 9 are laid around an upper sheave 6 provided in the upper part of the mast 1 and around a lifting drum 8 provided in the lower part of the mast 1, respectively. In order to smoothly raise and fall the lifting body 2 and the balance weight 3 along the mast 1, the mast 1 has an LM guide 4 for vertically guiding the lifting body 2 and an LM guide 5 for vertically guiding the balance weight 3 arranged along the mast 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lifting device,
In particular, the present invention relates to a lifting device that can be suitably used for a stacker crane that constitutes a transfer device provided in a clean room such as a semiconductor and a liquid crystal factory.

[0002]

2. Description of the Related Art As shown in FIG. 4, a lifting device used in a stacker crane which constitutes a transfer device disposed in a clean room such as a semiconductor and a liquid crystal factory is conventionally used for transferring a cassette 10 containing semiconductors and liquid crystals. A load (referred to as a “cassette” in this specification) is loaded, and the space between the lifting body 2 that rises and falls along the mast 1 and the upper part of the balance weight 3 is passed over the upper sheave 6 provided on the upper part of the mast 1. And a wire rope 9 attached to the lower part of the balance weight 3 is wound around a lifting drum 8 provided at a lower part of the mast 1.

[0003]

[Problems that the Invention is to Solve Accordingly, the conventional elevator apparatus, in order to smoothly lower the elevation body 2 in the case of a no-load state without loading the cassette 10, the weight W _B of the balance weight 3, here _{W B = W S -5kgf, W} S: is the weight of the lifting body 2. It was necessary to set to about. For this reason, when raising and lowering body 2 is lifted in the load state where cassette 10 is loaded, cassette 10
Assuming that the weight of the motor is W _C , the load of W _C +5 kgf is lifted, and there is a problem that the capacity of the electric motor for raising and lowering is increased accordingly.

The present invention has been made in view of the above-mentioned problems of the conventional elevating device, and the load applied to the elevating motor is increased in both the no-load state where no cassette is loaded and the loaded state where a cassette is loaded. An object of the present invention is to provide an elevating device capable of reducing the capacity of the elevating motor by making it correspond to the load applied to the elevating device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, an elevating device according to the present invention comprises an elevating body and a balance weight arranged so as to elevate and descend along a mast of a stacker crane; The upper cable and lower cable that are connected and stretched between the upper and lower parts of the balance weight, the upper sheave provided on the mast on which the upper cable is hung, and the lower part of the mast on which the lower cable is hung. And an elevating drum provided on the upper surface of the vehicle.

In this case, any of a wire rope, a chain, and a belt can be selected for the upper cable and the lower cable.

In this elevating device, an elevating body, which elevates and descends along the mast, and an upper part and a lower part of the balance weight are connected by an upper cable and a lower cable, respectively, and the upper cable is connected to the upper part of the mast. Since the lower cable is hung on the lifting drum provided below the mast on the upper sheave provided, the weight of the balance weight is used to smoothly lower the lifting body in the no-load state where no cassette is loaded. Does not need to be lighter than the lifting body,
When raising and lowering the elevating body with the cassette loaded on the elevating body, only the load corresponding to the weight of the cassette is lifted, and in either the unloaded state where the cassette is not loaded or the loaded state where the cassette is loaded. Also, the load applied to the elevating motor corresponds to the load applied to the elevating body.

Further, the weight W _B of the balance weight, wherein _{W B = W S -W C /} 2, W S: weight of the vertically movable body W _C: is the weight of the cassette. Can be set to

Thus, the load applied to the elevating motor can be the same in both the no-load state where the cassette is not loaded and the loaded state where the cassette is loaded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lifting device according to the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of an elevating device according to the present invention. This lifting device is applied to a stacker crane that constitutes a transfer device provided in a clean room such as a semiconductor and a liquid crystal factory.
The upper and lower portions of the lifting and lowering body 2 on which the cassette 10 which rises and lowers in a correlative manner and the balance weight 3 are connected by an upper cable 7 and a lower cable 9, respectively. Upper sheave 6 provided on top
A lifting drum 8 having a lower cable 9 provided below the mast 1;
To each other.

In this case, the lifting body 2 and the balance weight 3 move up and down along the mast 1 smoothly.
The mast 1 has an LM guide 4 for guiding the elevating body 1 vertically and an L for guiding the balance weight 3 vertically.
The M guide 5 is arranged along the mast 1.

The upper cable 7 and the lower cable 9 can be selected from a wire rope, a chain, and a belt, and the upper sheave 6 and the lifting drum 8 can be selected according to this. To

Thus, the lifting body 2 and the balance weight 3 are connected to each other by the upper cable 7 and the lower cable 8 to form an endless lifting mechanism.

Since the lifting device has the above-described structure, the weight of the balance weight 3 needs to be lighter than that of the lifting member 2 in order to smoothly lower the lifting member 2 in a no-load state where the cassette 10 is not loaded. And the weight of the balance weight 3 is set to be the same as the weight of the elevating body 2, so that the cassette 10 is loaded on the elevating body 2,
When the lifting body 2 is lifted, only the load corresponding to the weight of the cassette 10 is lifted, and the lifting motor (shown in the drawing) can be used in either the unloaded state where the cassette 10 is not loaded or the loaded state where the cassette 10 is loaded. The load applied to (omitted) can correspond to the load applied to the elevating body 2.

[0016] Then, more preferably, the weight W _B of the balance weight 3, where _{W B = W S -W C /} 2, W S: the elevation body 2 weight W _C: is the weight of the cassette 10. In any of the no-load state where the cassette 10 is not loaded and the load state where the cassette 10 is loaded, the load applied to the elevating motor is the same, that is,
W _C / 2.

[0017]

According to the elevating device of the present invention, the upper and lower portions of the balance weight and the upper and lower portions of the elevating body which rises and lowers in a correlated manner along the mast are connected by the upper cable and the lower cable, respectively. The rope is hung on the upper sheave provided on the upper part of the mast, and the lower cable is hung on the elevating drum provided on the lower part of the mast. In addition, it is not necessary to make the weight of the balance weight lighter than the elevating body.For this reason, when the elevating body is lifted in a load state in which the cassette is loaded on the elevating body, only the load corresponding to the weight of the cassette is lifted, The load applied to the lifting / lowering motor corresponds to the load applied to the lifting / lowering body in both the unloaded state where no cassette is loaded and the loaded state where a cassette is loaded. It is possible to, this way,
The capacity and power consumption of the lifting motor can be reduced.

Further, the weight W _B of the balance weight, wherein _{W B = W S -W C /} 2, W S: weight of the vertically movable body W _C: is the weight of the cassette. By setting to, in both the no-load state where the cassette is not loaded and the loaded state where the cassette is loaded,
The same load can be applied to the lifting / lowering motor, so that the capacity and power consumption of the lifting / lowering motor can be further reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an outline of an embodiment of a lifting device according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a front view showing an outline of a conventional elevating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mast 2 Lifting body 3 Balance weight 4 LM guide 5 LM guide 6 Upper sheave 7 Upper cable 8 Lifting drum 9 Lower cable 10 Cassette

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuzen Yamada 3-11-1, Shimosakabe, Amagasaki City, Hyogo Prefecture Inside Hitachi Kiden Kogyo Co., Ltd. (72) Mitsuo Ishizuka 3-11, Shimosakabe, Amagasaki City, Hyogo Prefecture No. 1 F term in Hitachi Kiden Kogyo Co., Ltd. (reference) 3F022 BB09 CC02 EE05 JJ07 MM02 5F031 DA01 GA02 GA57

Claims (2)

[Claims] An elevating body and a balance weight arranged so as to elevate and descend along a mast of a stacker crane, and an upper portion and a lower portion of the elevating body and the balance weight are connected and stretched respectively. An elevating device comprising an upper cable and a lower cable, an upper sheave provided on a mast on which the upper cable is hung, and a lifting drum provided below the mast on which the lower cable is hung. The weight W _B of 2. A balance weight, wherein _{W B = W S -W C /} 2, W S: weight of the vertically movable body W _C: is the weight of the cassette. The lifting device according to claim 1, wherein the lifting device is set to: