HK1128276B - Elevator device - Google Patents

Description

Elevator installation

Technical Field

The present invention relates to an elevator system having an elevator car that ascends and descends in a hoistway.

Background

In the conventional elevator equipment in which an elevator car and a counterweight are connected by a main rope, the main rope is passed through a diverting sheave, the elevator car, a rope sheave on the counterweight and wound around a drive pulley, and the elevator car and the counterweight are raised and lowered by driving the drive pulley, in order to reduce damage to the main rope by frictional driving and to reduce bending resistance, it is a common practice to set the diameters of the drive pulley and the rope sheave to 40 times or more the diameter of the main rope, but in recent years, for example, a main rope having improved bending performance by using synthetic fibers such as aramid and a main rope having improved service life by using a combination of steel wires and urethane resins have been developed so that even if the diameters of the drive pulley, the rope sheave and the like are set to 30 times or less the diameter of the main rope, the service life of the main sling can be prolonged, and the bending performance of the main sling is improved.

However, the main sling aiming at prolonging the service life has a problem of lack of flexibility, while the main sling aiming at improving the flexibility has a problem of short service life, so that the main sling capable of overcoming the defects is required to be developed.

As one of the methods for solving the above problems, for example, patent document 1 proposes a method in which a driving force is increased by increasing a winding angle of a main rope around a driving pulley in order to reduce a diameter of the driving pulley, and a size of the diverting pulley is reduced to a size substantially equal to that of the driving pulley because a small diverting pulley is preferable (for example, see patent document 1).

Patent document 1 Japanese unexamined patent publication No. 58-117476

However, in the above-described prior art, the purpose is only to reduce the size of the drive sheave, and no consideration is made to improve the overall performance of the elevator.

Disclosure of Invention

The invention aims to provide an elevator device, in which the service life of a main sling can be effectively prevented from being reduced under the condition that the diameter of a driving pulley is reduced.

In order to achieve the above object, an elevator system according to the present invention is an elevator system using a hoist having a drive sheave and having sheaves at least on an elevator car and a counterweight, wherein the diameter of the drive sheave is 29 times or less the diameter of a main rope, wherein the hoist is a thin hoist and is disposed below a hoistway, the main rope is configured to extend downward from an elevator car-side main rope fixing member disposed at a laterally upper portion of the elevator car, pass through a sheave for the elevator car disposed on the elevator car, extend through a diverting sheave for the elevator car disposed at an upper portion of the elevator car, and then extend downward again to reach the drive sheave, the main rope is wound around the drive sheave and extends from the diverting sheave for the counterweight side above toward the diverting sheave for the counterweight disposed below, and a counterweight-side main rope fixing member which reaches the upper part, wherein the counterweight is arranged at the rear part of the elevator car, the diameters of all the elevator car rope wheels and the counterweight-side rope wheels, and all or more than half of the elevator car-side diverting rope wheels and the counterweight-side diverting rope wheels are larger than the diameter of the driving pulley, and the diameters of the elevator car rope wheels and the counterweight-side rope wheels are larger than or equal to 1.5 times of the diameter of the driving pulley.

By having the structure as described above, the bending stress acting on the main sling and the bending resistance of the main sling can be reduced, so that the service life of the main sling can be prolonged and the energy-saving effect can be achieved, and the reduction in size of the hoist can be realized by reducing the diameter of the driving pulley, so that the space can be effectively utilized, the degree of freedom in arrangement of the hoist can be improved, and the convenience in maintenance can be improved.

Effects of the invention

According to the present invention, since the diameters of the sheave of the elevator car and the counterweight are larger than the diameter of the driving pulley, the bending stress acting on the main rope and the bending resistance of the main rope can be reduced, and as a result, the service life of the main rope can be prolonged, the energy saving effect can be achieved, and the reduction in size of the hoist can be achieved by reducing the diameter of the driving pulley, so that the space can be effectively utilized, the degree of freedom in installation of the hoist can be improved, and the convenience in maintenance can be improved.

Drawings

Fig. 1 is a perspective view showing an embodiment of an elevator apparatus according to the present invention.

Fig. 2 is a plan view of fig. 1 as viewed from above.

Fig. 3 is a perspective view showing another embodiment of an elevator apparatus according to the present invention.

Fig. 4 is a plan view of fig. 3 as viewed from above.

Fig. 5 is a perspective view showing still another embodiment of an elevator apparatus according to the present invention.

Fig. 6 is a plan view of fig. 5 as viewed from above.

Description of the symbols

1 Elevator cage

2 balance weight

3 elevator car side main sling fixing piece

4 main sling return pulley

5 Main sling

6a, 6b elevator car upper diverting sheave

7a, 7b rope sheave for elevator car

8a, 8b elevator car side diverting sheave

9 drive pulley

10-body thin and long type hoister

10A thin type hoister

11 balance weight side steering rope wheel

12a, 12b balance weight sheave

13 counterweight upper steering rope wheel

14 balance weight side main sling fixing piece

15a, 15b guide rail for elevator car

16a, 16b balance weight guide rail

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a perspective view showing an embodiment of an elevator apparatus of the present invention, fig. 2 is a plan view of fig. 1 as viewed from above, fig. 3 is a perspective view showing another embodiment of an elevator apparatus of the present invention, fig. 4 is a plan view of fig. 3 as viewed from above, fig. 5 is a perspective view showing still another embodiment of an elevator apparatus of the present invention, and fig. 6 is a plan view of fig. 5 as viewed from above.

In fig. 1, an elevator car side main rope fixing member 3 is provided at an upper portion of a side surface of an elevator car 1, and a main rope 5 is configured to extend downward from the elevator car side main rope fixing member 3, extend from an elevator car sheave 7a to another elevator car sheave 7b, reach a drive sheave 9 provided at an upper portion of the elevator car 1, and thereafter, the main rope 5 is wound around the drive sheave 9 by about 180 degrees, extend downward again, pass through a counterweight sheave 12a attached to a counterweight 2, and reach an upper counterweight side main rope fixing member 14.

The overall arrangement of the present invention will be described below with reference to fig. 2. In the example of fig. 2, the hoist 10 of a slim body is disposed above the elevator car 1, and the counterweight 2 is disposed at a side portion of the elevator car 1 without using a diverting sheave for connecting the elevator car 1 and the counterweight 2. Here, for example, when the main rope 5 in which the steel wire is coated with the resin is used, the friction coefficient between the drive sheave 9 and the main rope 5 is increased as compared with the case of using the main rope in which the steel wire is not coated with the resin, so that the diameter of the drive sheave 9 can be reduced, and as a result, the hoist 10 can be downsized. However, when the diameter of the drive pulley 9 is reduced, local stress acting on the main rope 5 increases, and measures such as increasing the hardness of the resin are required to extend the service life of the resin-coated main rope 5. By using the main hoist rope 5 having the resin hardness improved as described above, the diameter of the drive sheave 9 can be reduced, and the required drive torque, brake torque, and the like can be reduced, so that the size of the hoist device can be reduced, and the space around the hoist 10 can be increased by reducing the size of the hoist 10, so that the maintenance work can be facilitated.

On the other hand, if the diameters of the sheaves 7a and 7b for the elevator car and the sheave 12a for the counterweight are reduced at the same time, the bending resistance generated when the main hoisting rope 5 is wound around the sheaves 7a and 7b and the sheave 12a for the counterweight increases, and the running loss of the elevator increases. Further, when the diameters of the sheaves 7a and 7b for the elevator car and the counterweight sheave 12a are reduced, the local stress of the main rope increases, and the service life of the main rope 5 is reduced. Therefore, the size of the sheaves 7a and 7b for the elevator car and/or the sheave 12a for the counterweight can be increased as necessary relative to the drive sheave 9, and the bending resistance, the service life of the main rope, and the like can be controlled within an allowable range, whereby the efficiency of use of the installation space of the hoist 10 can be improved without significantly changing the overall structure of the elevator.

In this case, the above object can be achieved by setting the diameter of the sheave to be larger than the diameter of the drive pulley 9, but if possible, the service life of the main rope can be more stably increased by setting the diameter of the sheave to be 1.5 times the diameter of the drive pulley.

In the above description, the diameter of the drive sheave 9 is set to 29 times or less of the main rope 5, but the diameter of the drive sheave 9 is most preferably in the range of 16 to 29 times of the main rope 5. This is because, if the diameter of the drive pulley 9 is 16 times or less the diameter of the main rope 5, the local resistance increases, and the service life of the main rope cannot be increased.

Further, if a resin-coated sling or a sling mainly composed of an aramid resin or the like is used as the main sling 5, the bendability can be improved, and the diameter of the drive pulley 9 can be set to 29 times or less of the main sling 5 with extreme ease.

Next, another embodiment will be described with reference to fig. 3 and 4. In fig. 3, an elevator car-side main rope fixing member 3 is provided at a lateral upper portion of an elevator car 1, and a main rope 5 is configured to extend downward from the elevator car-side main rope fixing member 3, extend from an elevator car rope sheave 7a through another elevator car rope sheave 7b, extend through elevator car-side diverting sheaves 8a and 8b provided at the upper portion of the elevator car 1, extend downward again, and reach a drive sheave 9, and then the main rope 5 is wound around the drive sheave 9 by about 180 degrees, extends toward an upper counterweight diverting sheave 11, extends through the counterweight diverting sheave 11, extends toward counterweight diverting sheaves 12a and 12b provided at a lower counterweight 2, and finally reaches an upper counterweight main rope fixing member 14.

Fig. 4 is different from fig. 2 in that the counterweight 2 is disposed behind the elevator car 1 by providing the car-side diverting sheaves 8a and 8b between the elevator car 1 and the drive sheave 9, providing the thin hoist 10A below the hoistway, providing the counterweight-side diverting sheave 11 between the drive sheave 9 and the counterweight 2, and providing 2 sheaves 12a and 12b on the counterweight-side diverting sheave.

By having the above-described configuration, the degree of freedom of installation of the counterweight 2 is increased, and the installation efficiency in the hoistway can be improved, but the problems of bending resistance, the service life of the main rope, and the like become more significant due to the increase in the number of sheaves as compared with the above-described embodiment shown in fig. 1 and 2. Therefore, in the embodiment shown in fig. 3 and 4, by setting the diameters of at least all of the sheaves 7a, 7b, 12a, 12b and all or more than half of the other diverting sheaves 8a, 8b, 11 of the elevator car 1 and the counterweight 2 to be larger than the diameter of the driving sheave, the same effect as that of the embodiment shown in fig. 1 and 2 can be obtained.

A further embodiment is described below with reference to fig. 5 and 6. In fig. 5, a main hoisting rope 5 is configured to extend from an elevator car main hoisting rope fixing member 3 provided in a floor portion of an elevator car 1 through a main hoisting rope return pulley 4 and upward, to extend from diverting sheaves 6a and 6b provided in an upper portion of the elevator car through a car sheave 7a provided in a ceiling portion of the elevator car 1, to extend from an elevator car-side diverting sheave 8a provided in an upper portion of the elevator car 1 toward a drive sheave 9, to wind the main hoisting rope 5 around the drive sheave, to extend through a counterweight-side sheave 12a provided in a lower counterweight 2, to extend again toward a counterweight-side sheave 13 provided in an upper portion of a hoistway, and to reach a counterweight-side main hoisting rope fixing member 14 of the counterweight 2.

In fig. 4, the main hoisting rope is wound in a 2: 1 winding method, compared to fig. 6, in which the main hoisting rope is wound in a 3: 1 winding method and the body slim type winding machine 10 is disposed above the elevator car 1, which is very different from fig. 4. With the above configuration, even when the diameter of the drive sheave 9 is the same as that in fig. 4, the drive torque, the braking torque, and the like can be reduced, and therefore the hoisting machine can be further downsized. As described above, although the elevator has various configurations, in any of the configurations, the same effects as those of the previous embodiments can be obtained by setting the diameter of the sheave other than the drive pulley to be larger than the diameter of the drive pulley under the above-described conditions.

Claims (1)

1. An elevator apparatus using a hoist having a drive sheave and having a sheave at least on an elevator car and a counterweight, wherein a diameter of the drive sheave is 29 times or less a diameter of a main hoist rope,

the hoist is a thin hoist and is arranged below the lifting channel,

the main rope is configured to extend downward from an elevator car side main rope fixing member provided at a laterally upper portion of the elevator car, pass through an elevator car sheave provided at the elevator car, then pass through an elevator car side diverting sheave provided at an upper portion of the elevator car, then extend downward again to reach the drive sheave, and is wound around the drive sheave, extends from an upper counterweight side diverting sheave toward a counterweight side diverting sheave provided at a lower counterweight, and finally reaches an upper counterweight side main rope fixing member,

the counterweight is arranged behind the elevator car,

the diameters of all the rope pulleys for the elevator car and the balance weight rope pulleys, and all or more than half of the elevator car side diverting rope pulleys and the balance weight side diverting rope pulleys are larger than the diameter of the driving pulley,

the diameters of the rope wheel for the elevator cage and the balance weight rope wheel are more than or equal to 1.5 times of the diameter of the driving pulley,

as the main slings, slings coated with resin or slings mainly composed of aramid resin are used.