HK1119644B - Elevator equipment - Google Patents

Description

Elevator installation

Technical Field

The invention relates to an elevator installation in which a tail cable is suspended from the lower part of an elevator car.

Background

A suspension structure of a tail cable in a general elevator apparatus will be described with reference to fig. 5 to 7. Fig. 5 is a cross-sectional view of a hoistway illustrating a general suspension structure of a conventional elevator tail cable, fig. 6 is a schematic view of a suspension structure of a bottom of an elevator car of fig. 5, and fig. 7 is a plan view of the suspension structure of the elevator tail cable of fig. 5.

As shown in fig. 5, an elevator car 7 suspended by main ropes 6 and having guide devices 8 at upper and lower portions travels vertically in the hoistway 1 under the guide of guide rails 5 provided in the hoistway 1. In a high-lift elevator, an auxiliary rope 12 is suspended and connected to the bottom of the elevator car 7 and the counterweight 9 in order to compensate for the load of the main rope 6. A tail cable 10 is mounted on the bottom of the elevator car 7 and an intermediate junction box 11 provided in the middle part of the hoistway 1. In this case, the left and right guide rails 5 and the tail cable 10 are generally arranged in parallel.

As shown in fig. 6, the suspension member 15 of the tail cable 10 is mounted on the elevator car lower frame 13 by a fixing bolt 14. In this case, in consideration of the play of the tail cable 10, it is necessary to maintain a gap of a predetermined size between the tail cable 10 and the guide rail 5. The self weight of the tail cable 10 acts as a sagging load on the elevator car 7. As the elevator car 7 ascends from the lowermost floor to the uppermost floor of the hoistway 1, the drooping load of the tail cable 10 gradually increases and reaches the maximum load at the uppermost floor.

In recent years, buildings have been becoming higher-rise, and very high-rise buildings having an elevating stroke of more than 400m have been increasingly used. Therefore, the drooping load of the tail cable 10 tends to increase in the future. In such a case, as shown in fig. 7, the left and right guide rails 5 and the tail cable 10 are generally arranged side by side. At this time, the offset load in the front-rear direction generated in the elevator car 7 is determined by the magnitude of the moment in the front-rear direction generated in the elevator car 7, and when the deviation between the center of the guide rail of the elevator car 7 and the center of the hanging load point of the tail cable 10 is L, the hanging load of the tail cable 10 is W, and the moment generated in the elevator car 7 is M, the relationship of M — W × L is satisfied.

Since the value of the hanging load W of the tail cable 10 is determined by the lifting stroke and the mass of the tail cable 10, it is necessary to reduce the deviation L between the center of the guide rail of the elevator car 7 and the center of the hanging load point of the tail cable 10 in order to reduce the moment generated in the elevator car 7. The same problem occurs with the offset load in the left-right direction generated in the elevator car 7, and in general, the offset load generated in the elevator car 7 is reduced by canceling the moment in the front-back direction and the left-right direction generated in the elevator car 7 by the moment generated by the auxiliary rope 12. However, when the moment on the side of the tail cable 10 increases, the moment on the side of the auxiliary hoist rope 12 also needs to increase.

For this reason, for example, japanese patent application laid-open No. 6-191762 of patent document 1 discloses a technique for reducing a load offset in the left-right direction occurring in the elevator car 7 by moving the suspension position of the tail cable 10 between the lowermost layer and the uppermost layer (see, for example, patent document 1).

Further, for example, japanese patent application laid-open No. 2004-75235 of patent document 2 discloses a technique for reducing an offset load generated in the elevator car 7 by the tail cable 10 by moving the counterweight (for example, see patent document 2).

Further, for example, japanese patent application laid-open No. 8-91734 of the present invention of patent document 3 discloses a technique of increasing the rigidity of the tail cable 10 to increase the suspension interval of the tail cable 10 and suspending the tail cable at a position close to the center in the left-right direction of the elevator car 7 to reduce the offset load in the left-right direction of the elevator car 7 (for example, see patent document 3).

Patent document 1: japanese unexamined patent publication Hei 6-191762

Patent document 2: japanese laid-open patent application No. 2004-75235

Patent document 3: japanese unexamined patent publication Hei 8-91734

The increase in the offset load generated in the elevator car not only causes an increase in vibration and noise during running of the elevator car, thereby deteriorating the riding environment, but also increases the size of the mounting members and fixing bolts required to suspend the tail cable at the bottom of the elevator car, thereby increasing the mass.

In the patent documents 1 and 2, a drive device, a power supply, a control device, and the like for moving the position of the tail cable or the counterweight are required, which increases the cost and the mass.

In addition, in patent document 3, the use of a special tail cable increases the cost.

Disclosure of Invention

The invention aims to provide an elevator device, which can reduce the offset load brought to an elevator car by a tail cable without adding a special device.

In order to achieve the above object, an elevator apparatus according to claim 1 of the present invention has a hoistway; a pair of guide rails disposed in the hoistway; and a tail cable which is suspended by the main rope and is arranged on an elevator car lower frame at the lower part of the elevator car, wherein one end of the elevator car lower frame which is suspended by the main rope and ascends and descends along the guide rail is connected with a suspension component which is arranged on the elevator car lower frame, and the other end of the tail cable is connected with the middle part of the lifting passage.

According to this configuration, the offset load in the front-rear direction generated in the elevator car can be reduced.

Further, the elevator equipment according to claim 2 of the present invention is characterized in that a plurality of the tail cables are provided, the plurality of tail cables are divided into two parts, and the divided tail cables are suspended so that: the elevator car is disposed at a point-symmetrical position with respect to the intersection of the right and left center lines of the elevator car and the straight line connecting the right and left guide rails on a plane viewed in the vertical direction of the hoistway.

According to this configuration, when the plurality of tail cables are provided, the offset load in the front-rear direction and the left-right direction generated in the elevator car can be reduced.

Further, an elevator system according to claim 3 of the present invention is characterized in that the suspending member of the tail cable is attached to an upper portion of a lower frame of the elevator car.

According to this configuration, since the lower frame of the elevator car directly receives the load, the load on the fixing bolt can be reduced and the size of the elevator car can be reduced.

Further, the elevator system according to claim 4 is characterized in that the car-side end of the tail cable is attached to a position at a central portion of the suspension member.

According to this configuration, the left and right bolts are equally subjected to the load of the suspension member attached to the lower frame of the elevator car, and therefore, these bolts can be made smaller.

Effects of the invention

According to the present invention, by reducing the offset load in the front-rear direction or the offset load in the front-rear direction and the left-right direction generated in the elevator car, the vibration, noise, and the like during traveling can be reduced, and the riding environment can be improved.

Drawings

Fig. 1 is a plan view showing an elevator tail cable suspension structure according to an embodiment of the present invention;

fig. 2 is a schematic view of the elevator car bottom suspension of fig. 1;

fig. 3 is a plan view showing an elevator tail cable suspension structure according to another embodiment of the present invention;

fig. 4 is a schematic view of an elevator tail cable suspension according to other embodiments of the present invention;

fig. 5 is a cross-sectional view of a hoistway illustrating a general suspension structure of a tail cable of an elevator in the related art;

fig. 6 is a schematic view of the elevator car bottom suspension of fig. 1;

fig. 7 is a top view of the elevator tail cable suspension structure of fig. 1.

Description of the symbols

1 lifting channel

2 mechanical chamber

3 hoisting machine

4 control device

5 guide rail

6 main sling

7 Elevator car

8 guide device

9 balance weight

10 tail cable

11 intermediate junction box

12 auxiliary sling

13 lower frame of elevator car

14 fixing bolt

15 suspension member

Detailed Description

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

Fig. 1 is a plan view showing an elevator tail cable suspension structure according to an embodiment of the present invention, fig. 2 is a schematic view showing an elevator car bottom suspension structure in fig. 1, fig. 3 is a plan view showing an elevator tail cable suspension structure according to another embodiment of the present invention, and fig. 4 is a schematic view showing an elevator tail cable suspension structure according to another embodiment of the present invention.

In fig. 1, the car-side end of the tail cable 10 is suspended near the center of the guide rail in the front-rear direction of the elevator car 7, and the hoistway-side end is disposed at a position spaced sufficiently from the guide rail 5, and the tail cable 10 is suspended in an inclined manner with respect to the center line connecting the left and right guide rails 5 when viewed from above. As a result, the elevator car-side end of the tail cable 10 can be positioned near the center of the guide rail, and the center offset L between the center of the guide rail of the elevator car 7 and the center of the hanging load point of the tail cable 10 can be reduced, thereby reducing the moment generated in the elevator car 7 and reducing the offset load in the front-rear direction generated in the elevator car 7. The moment in the left-right direction is cancelled by the moment of the auxiliary hoist rope 12.

As shown in fig. 2, by providing the elevator car side end portion of the tail cable 10 between the elevator car lower frames 13, the tail cable suspension member 15 can be made smaller and lighter, and in the structure of fig. 6, the load borne by the bolt 14a is greater than the load borne by the bolt 14b, whereas in the embodiment of fig. 2, the bolts 14a and 14b bear equal loads, so that the size of the bolts 14a and 14b that fix the suspension member 15 to the elevator car lower frame 13 can be reduced.

As shown in fig. 3, a plurality of tail cables are generally used in a high-stroke elevator. An increase in the number of tail cables also means an increase in the offset load of the elevator car. Here, the plurality of tail cables 10a and 10b are suspended and installed at positions of L2 and L3, respectively, and when the masses of the plurality of tail cables 10a and 10b are the same, L2 is set to L3, and when the masses are different, the positions of L2 and L3 are set to Ma ═ Wa × L2, Mb ═ Wb × L3, and Ma ═ Mb, when the hanging loads and moments of the tail cables 10a and 10b are Wa, Wb, Ma, and Mb, respectively.

According to this configuration, the offset load of the elevator car 7 in the front, rear, left, and right directions can be reduced without depending on the auxiliary hoist ropes 12. Further, by securing a gap between the plurality of tail cables 10a, 10b, it is possible to prevent the tail cables from interfering with each other. And the plurality of tail cables 10a, 10b can be suspended near the center of the guide rail of the elevator car 7, so that the tail cable suspension member 15 can be made smaller and lighter and the fixing bolts 14a, 14b can be made smaller.

Fig. 4 shows a structure in which the tail cable suspension member 15 is attached to the upper portion of the elevator car lower frame 13. In fig. 6, a structure in which the fixing bolt 14a receives a tensile load is adopted, and in this structure, a structure in which the load is directly received by the elevator car lower frame 13 is adopted, whereby the load on the fixing bolts 14a and 14b can be reduced and the size thereof can be reduced.

Claims (4)

1. An elevator installation having: a lifting channel; a pair of guide rails disposed in the hoistway; an elevator car suspended by a main rope and lifted along the guide rail; an elevator car lower frame disposed at a lower portion of the elevator car; and a tail cable having one end connected to a suspension member mounted on a lower frame of the elevator car and the other end connected to a middle portion of the hoistway,

the car-side end of the tail cable is suspended near the suspension center in the front-rear direction of the elevator car, and the tail cable is suspended in an inclined shape on a plane viewed in the vertical direction of the hoistway such that a straight line connecting the hoistway-side end of the tail cable and the car-side end of the tail cable forms an angle with a straight line connecting the pair of guide rails of the elevator car.

2. Elevator installation according to claim 1,

the tail cables are arranged to divide the tail cables into two parts, and the tail cables divided into two parts are suspended into: the elevator car is disposed at a point-symmetrical position with respect to the intersection of the right and left center lines of the elevator car and the straight line connecting the right and left guide rails on a plane viewed in the vertical direction of the hoistway.

3. Elevator installation according to claim 1 or 2,

the suspension part of the tail cable is mounted on the upper part of the lower frame of the elevator car at the bottom of the elevator car.

4. Elevator installation according to claim 1 or 2,

the car-side end of the tail cable is attached to a position at the center of the suspension member.