JP2002173280A - Weight compensating device of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weight compensating device of an elevator capable of simplifying its structure and reducing cost of it even with the elevator of a long stroke. SOLUTION: This weight compendating device has a cable type member 120 both ends of which are respectively connected to a lower part of a car 4 and a lower part of a balance weight 5 and to compensate weight unbalance of a main rope 3, and a reinforcing member of this cable type member 120 is constituted of a steel made member. It is possible to compensate the weight unbalance of the main rope 3 by a comparatively small number of the cable type members 120 with the members constituted in this way as the weight of the cable type members 120 with the steel made members as the reinforcing members is comparatively large in comparison with the main rope 3 mass per unit volume of the reinforcing member of which is comparatively light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator weight compensating device having a main rope weight compensating cord, for example, an elevator having a cable-like member, and more particularly to an elevator weight compensating device suitable for a long-stroke elevator. About.

[0002]

2. Description of the Prior Art FIG.
It is a perspective view which shows the elevator of one roping. In addition,
In FIG. 3, other components such as a cab, a guide device, a guide rail, an elevator drive motor, a brake, a door, and a safety device are omitted.

[0003] The elevator shown in FIG. 3 includes a sheave 1 provided on an output shaft of a hoist (not shown), a warp wheel 2 disposed near the sheave 1, a sheave 1 and a warp wheel 2
Main rope 3 suspended on both sides of the hoistway, a car 4 and a counterweight 5 connected to both ends of the main rope 3 via elastic members 7 such as springs.
Weight compensating cords, for example, cable-like members 12, both ends of which are connected to lower portions of the car 4 and the counterweight 5, respectively, and which hang down in a U-shape in the hoistway. Pulley 10 around which the lower part is wound
And a tie-down device 11 for holding the compensation pulley 10 below the hoistway. When a steel wire rope is used as the main rope 3, the cable-like member 12
Generally, a compensating rope (steel wire rope) made of the same member as the main rope 3 is used.

In the elevator configured as described above, the car 4 is driven in the driving direction, that is, in the vertical direction, through the main rope 3 by controlling the torque of the hoist that hoists the main rope 3. I have. When the stroke of the elevator becomes longer, the length of the main rope 1 greatly changes between the car 4 and the counterweight 5 depending on the position of the car 4, so that the weight imbalance due to the weight of the main rope 1 increases, The load fluctuation of the upper machine increases. Therefore, the tie-down device 11
By winding the cable-shaped member 12 around the compensation pulley 10 held at the lower part of the hoistway, the above-mentioned weight imbalance is suppressed, and the load fluctuation of the hoist is reduced.

Further, as the elevator travels longer, the ratio of the mass of the main rope 3 and the cable-like member 12 to the entire elevator becomes larger, and adverse effects such as an increase in the capacity of the drive motor and an increase in the size of the tie-down device 11 are caused. May appear. Therefore, as a conventional technique for reducing these adverse effects, for example, as disclosed in Japanese Patent Application Laid-Open No. 7-267534, a material such as a chemical fiber having a smaller mass per unit volume than a steel wire rope is used. A material used as a main rope as a strength member has been proposed.

As described above, in the case of an elevator having a long stroke, since the weight imbalance exceeds the allowable range, it is necessary to attach the cable-like member 12. Since the weight imbalance of the main rope is within an allowable range, it is not necessary to attach a cable member for weight compensation. Furthermore, even in the case of an elevator that does not require the weight compensation cable member as described above, the natural vibration frequency of the spring / mass system including the car, the main rope, the sheave, the hoist, and the counterweight is required. If a vertical vibration problem is caused, it may be necessary to attach a weight compensation cable member.

In the above-described conventional weight compensator,
Although the case where a 1: 1 roping elevator is provided is illustrated, the same applies to a case where a 2: 1 roping elevator is provided. In this 2: 1 roping elevator, a main rope hung on a sheave of a hoist is also wound on a pulley provided on a riding weight and a counterweight, and both ends of the main rope are attached to the upper part of a hoistway by a spring or the like. They are connected via elastic members.

[0008]

By the way, in the above-mentioned prior art, the main rope 3 made of a material such as chemical fiber as a strength member is used, and the cable-like member 12 is made lighter by using the same member. Advantageously, the number of cable-like members 12 is on the same level as the number of main ropes 3, and especially in the case of a long-stroke elevator, the number of cable-like members 12 increases, so that the connection between the car 4 and the counterweight 5 is complicated. As well as the compensation pulley 10 and the tie-down device 11
However, there is a problem that installation work and maintenance and inspection are troublesome and cost is high.

In addition, since the material of the cable-like member 12, such as chemical fiber, is generally more expensive than the conventional steel wire rope, the cost is high, which is disadvantageous from the viewpoint of cost reduction accompanying recent price destruction. There are also problems.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned situation in the prior art, and has as its object to provide a weight compensation system for an elevator that can simplify the structure and reduce the cost, especially for a long-stroke elevator. It is to provide a device.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an elevator having a main rope mainly composed of a rope whose weight per unit volume of a strength member is lighter than a steel wire rope. An elevator weight compensating device including a weight compensating cord connected to the lower portion of the car and having the other end connected to the lower portion of the counterweight to compensate for the weight imbalance of the main rope. The cord-like body is constituted by using a steel member as a strength member.

According to the present invention having the above-described structure, the weight member per unit volume of the strength member is smaller than the main rope, which is lighter than the steel wire rope. Due to the large weight of the body, the weight imbalance of the main rope can be compensated for by a relatively small number of weight compensating cords. Costs can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an elevator weight compensation device according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a 1: 1 roping elevator equipped with a weight compensating device according to an embodiment of the present invention. In FIG. 1, the same components as those shown in FIG. 3 described above are denoted by the same reference numerals.

The weight compensator of the present embodiment shown in FIG.
Compared to the one shown in FIG.
For example, the difference is that the strength member of the cable-like member 120 is made of a steel member, and the number of the cable-like members 120 is set to be smaller than the number of the main ropes 3,
Other configurations are basically the same. The main rope 3
Is generally made of a material such as a chemical fiber having a smaller mass per unit volume than a steel wire rope.

In the weight compensating device of this embodiment,
The lower part of the cable-like member 120 is wound around the compensation pulley 100, and this compensation pulley 100 is
0 is held at the lower part of the hoistway.

In the weight compensating apparatus of the present embodiment configured as described above, the weight of the cable-like member 120 having a steel member as a strength member is larger than that of the main rope 3 whose strength member is made of a material such as a chemical fiber. Therefore, the weight imbalance of the main rope 3 can be compensated for by the relatively small number of cable-like members 120. That is, the number of the cable-like members 120 can be reduced particularly in a long-stroke elevator, and not only the connection between the car 4 and the counterweight 5 is simplified, but also the compensation pulley 100 and the tie-down device 110 are large. Since installation work and maintenance and inspection can be easily performed without reducing the cost, the cost can be reduced.

FIG. 2 is a perspective view showing a 2: 1 roping elevator equipped with a weight compensating device according to another embodiment of the present invention. 1 and 3 described above with reference to FIG.
Are denoted by the same reference numerals.

In the elevator shown in FIG. 2, both ends of the main rope 3 are connected to the upper part of the hoistway via an elastic member 7, and the main rope 3 is wound around the sheave 1 and the warp wheel 2, and the car 4 and Pulley 6 provided on each upper part of counterweight 5
And 2: 1 roping. With the 2: 1 roping elevator configured in this way, the capacity of a drive motor (not shown) can be reduced when the rated load capacity is the same, as compared with the 1: 1 roping elevator shown in FIGS. .

The weight compensator of the present embodiment shown in FIG. 2 has the same configuration as that of the embodiment shown in FIG.
That is, the strength member of the cable-like member 120 is made of a steel member as compared with the one shown in FIG.
The difference is that the number of the cable-like members 120 is set to be smaller than the number of the main ropes 3, and other configurations are basically the same.

The weight compensating apparatus according to the present embodiment having the above-described structure can provide the same effects as those of the embodiment shown in FIG.

In the present invention, the cable-like member 120 is used.
May be provided as a compensating rope (steel wire rope), and is not limited to this compensating rope.
A chain or a cable coated on the chain may be provided as the cable-like member.

Further, in these embodiments, the case where both the compensating pulley 100 and the tie-down device 110 are provided is exemplified, but both are not necessarily required.
Further, both may not be provided.

Further, in the above-described embodiment, the 1: 1 roping elevator and the 2: 1 roping elevator have been described. However, regardless of the type of roping, the hoist and the sheave are installed below the hoistway. Similarly, the weight compensation cable member may be a steel wire rope.

[0025]

As described above, according to the present invention,
Compared with the main rope, whose weight per unit volume of the strength member is lighter than that of the steel wire rope, the weight of the cable for weight compensation using the steel member as the strength member is larger. The weight imbalance of the main ropes can be compensated for by a relatively small number of weight compensating cords, and the connection between the car and the counterweight can be simplified. Further, with the simplification of the structure described above, cost reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a 1: 1 roping elevator equipped with a weight compensation device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a 2: 1 roping elevator equipped with a weight compensation device according to another embodiment of the present invention.

FIG. 3 is a perspective view showing a 1: 1 roping elevator equipped with a conventional weight compensation device.

[Explanation of symbols]

3 ... main rope, 4 ... basket, 5 ... counterweight, 12
0 ... Cable-shaped member (cord-like body for weight guarantee), 100 ...
... Compensation pulley, 110 ... Tie-down device.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ichiro Nakamura 832 Horiguchi, Hitachinaka-shi, Ibaraki Pref.System Plaza Katsuta Hitachi Mito Engineering Co., Ltd. No. 1-1 F term in Hitachi Research Laboratory, Hitachi, Ltd. F-term (reference) 3F305 BB02 BB04 BB07 BB14 BC19 BC20

Claims (5)

[Claims] 1. An elevator having a main member made of a rope whose weight per unit volume of a strength member is lighter than a steel wire rope, one end of which is connected to a lower portion of a car, and the other end of which is a counterweight. A weight compensating cord connected to a lower portion of the main rope and compensating for a weight imbalance of the main rope, wherein the weight compensating cord uses a steel member as a strength member. A weight compensating device for an elevator, comprising: 2. The weight compensation device for an elevator according to claim 1, wherein the strength member of the main rope is made of a synthetic fiber. 3. The elevator weight compensating device according to claim 1, wherein the weight compensating cord is made of a steel wire rope or a chain. 4. The elevator weight compensating device according to claim 1, wherein the number of the weight compensating cords is set to be smaller than the number of the main ropes. 5. The elevator according to claim 1, further comprising a compensating pulley around which the weight compensating cord is wound, and a tie-down device for holding the compensating pulley below the hoistway. Weight compensator.