HK1219084B - Elevator without machine room and method of retrofitting the same - Google Patents

Abstract

An elevator without machine room and method of retrofitting the same. It is an object of the present invention to provide a traction machine whose mounting dimensions and profile dimensions are different from before the retrofitting by using various devices. In the case of retrofitting an elevator without machine room, a counterweight deflection sheave is removed from an upper support body (13), a new traction machine (21) is disposed at the position of the upper support body (13) where the counterweight deflection sheave was mounted. Further, a drive sheave (7) of a traction machine (5) at a lower part of a shaft (4) serves as a lower deflection sheave of the retrofitted elevator. Besides, a magnetic resistance to the rotation of the drive sheave (7) is eliminated by removing a coil section from the traction machine (5) at the lower part of the shaft (4).

Description

Method for modifying elevator without machine room and elevator without machine room

Technical Field

The present invention relates to an elevator retrofitting method for retrofitting an existing machine room-less elevator in which a hoisting machine is provided in a lower part of a hoistway into a machine room-less elevator in which a hoisting machine is provided in an upper part of the hoistway.

Background

In a conventional method of retrofitting an elevator, a car hanging sheave is mounted on an upper portion of an existing car, and a counterweight hanging sheave is mounted on an upper portion of an existing counterweight. Then, the hoisting machine is removed from the equipment base provided in the machine room. Then, a new traction machine and a tail stock are set to the equipment base. Then, the main rope is wound around the hoisting machine, the car sheave, and the counterweight sheave, and both ends of the main rope are connected to the tail stock (see, for example, patent document 1).

Patent document 1: japanese patent laid-open No. 2001-220078

Disclosure of Invention

In the above-described modification of the elevator having the machine room type, since a new hoisting machine is installed in an existing equipment base, the installation size and the outer dimensions of the hoisting machine can be changed relatively easily. In contrast, in the conventional machine-room-less elevator, since the dimensional restrictions in the hoistway are relatively strict, a hoisting machine having the same mounting dimensions and outer dimensions as those of the hoisting machine before the retrofitting is installed at the same position as those before the retrofitting. In addition, when a hoisting machine having a mounting size and an external size different from those before the modification is installed, a construction method is adopted in which all the devices in the hoistway are removed and reset, and the modification period is considerably long.

The present invention has been made to solve the above-described problems, and an object thereof is to provide a method of retrofitting a machine room-less elevator in which a hoisting machine having a different installation size and external dimensions from those before retrofitting can be installed using a variety of equipment.

In the retrofitting method of a machine room-less elevator of the present invention, the machine room-less elevator has: a car; a counterweight; a suspension body which suspends the car and the counterweight; an existing traction machine which is arranged at the lower part in the hoistway and enables the lift car and the counterweight to ascend and descend by means of a suspension body; an upper support body provided at an upper portion in the hoistway; and an upper return sheave provided on the upper support body and around which the suspension body is wound, wherein the method for modifying the machine-roomless elevator includes the steps of: removing the upper diverting sheave from the upper support body; and installing a new hoisting machine on the upper support body.

The present invention also provides a machine room-less elevator, wherein the machine room-less elevator has: a car; a counterweight; a suspension body which suspends the car and the counterweight; an upper hoist which is provided at an upper portion in the hoistway and lifts the car and the counterweight via a suspension body; and a lower hoisting machine provided at a lower portion in the hoistway, the lower hoisting machine not generating a driving force and being used as a lower return sheave.

In the method of retrofitting a machine roomless elevator according to the present invention, since a new hoisting machine is installed at a position where a diverting pulley is disposed in an upper portion in a hoistway, a hoisting machine having a mounting dimension and an external dimension different from those before retrofitting can be installed using a variety of equipment.

Drawings

Fig. 1 is a schematic plan view showing a machine room-less elevator according to embodiment 1 of the present invention before modification.

Fig. 2 is a front view showing an outline of the machineroom-less elevator of fig. 1.

Fig. 3 is a perspective view schematically showing a support structure of the car return sheave and the counterweight return sheave of fig. 2.

Fig. 4 is a plan view schematically showing a state after the refitting of the elevator without a machine room of fig. 1.

Fig. 5 is a front view showing an outline of the machine room-less elevator of fig. 4.

Fig. 6 is a perspective view schematically showing a support structure of the hoisting machine shown in fig. 5.

Fig. 7 is a perspective view showing a modification of the hoisting machine support structure of fig. 5.

Description of the reference symbols

1: a car; 2: a counterweight; 3: a suspension body; 4: a hoistway; 5: an existing hoisting machine (lower hoisting machine); 7: a drive sheave (lower diverting sheave); 13: an upper support; 15: a counterweight sheave (upper sheave); 17 a: 1 st diverting pulley beam; 17 b: 2 nd diverting pulley beam; 21: a new traction machine (upper traction machine); 24a, 24 b: a traction machine table.

Detailed Description

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

Embodiment 1.

Fig. 1 is a plan view showing an outline of a machine room-less elevator according to embodiment 1 of the present invention before retrofitting, and fig. 2 is a front view showing an outline of the machine room-less elevator shown in fig. 1. In the figure, a car 1 and a counterweight 2 are suspended in a hoistway 4 by a suspension body 3 (not shown in fig. 1). The suspension body 3 is provided with a plurality of ropes or a plurality of belts.

The counterweight 2 is disposed behind the car 1 so as to face the back surface of the car 1 when positioned at the same height as the car 1 when viewed from a landing. The counterweight 2 is disposed on one side (right side in fig. 1) with respect to the center in the width direction (left-right direction in fig. 1) of the car 1 as viewed from directly above.

A hoisting machine 5 as an existing hoisting machine is installed in a lower portion (pit) in the hoistway 4. The hoisting machine 5 raises and lowers the car 1 and the counterweight 2 via the suspension body 3. The hoisting machine 5 includes a hoisting machine main body 6 and a drive sheave 7. The hoisting machine main body 6 includes a motor for rotating the drive sheave 7 and a brake for braking the rotation of the drive sheave 7. The suspension body 3 is suspended around the drive sheave 7.

Further, as the hoisting machine 5, a long hoisting machine having a larger axial dimension than the dimension in the direction perpendicular to the axial direction is used. The hoisting machine 5 is disposed such that its axis is inclined with respect to the center line in the width direction of the car 1 when viewed from directly above.

The hoisting machine 5 is disposed directly below a corner portion on the opposite side to the side where the counterweight 2 at the rear of the car 1 approaches, so as to overlap most of the car 1 when viewed from directly above. However, the leading portion of the suspension body 3 of the drive sheave 7 does not overlap the car 1 when viewed from directly above.

In the hoistway 4, first and second car guide rails 8a and 8b for guiding the up-and-down movement of the car 1 and first and second counterweight guide rails 9a and 9b for guiding the up-and-down movement of the counterweight 2 are provided. The car guide rails 8a and 8b are disposed on both sides of the car 1 at an intermediate portion in the front-rear direction (vertical direction in fig. 1) of the car 1.

The 1 st and 2 nd car hanging wheels 11a and 11b are provided at the lower part of the car 1. A counterweight suspending wheel 12 is provided on the upper portion of the counterweight 2. The car hanging wheels 11a and 11b and the counter hanging wheel 12 are disposed such that their rotation axes are horizontal and perpendicular to the width direction of the car 1.

An upper support body 13 (not shown in fig. 1) is provided at an upper portion (ceiling portion) in the hoistway 4. The upper support body 13 is supported by the car guide rails 8a and 8b and the counterweight guide rails 9a and 9 b. A car return sheave 14 and a counterweight return sheave 15 as upper return sheaves are supported by the upper support body 13.

The car return sheave 14 is disposed between the drive sheave 7 and the 2 nd car hanging sheave 11b when viewed from directly above. The car return sheave 14 is disposed so that the rotation axis thereof is horizontal and parallel to the width direction of the car 1.

The counterweight return sheave 15 is disposed between the drive sheave 7 and the counterweight suspending sheave 12 when viewed from directly above. The counterweight return sheave 15 is disposed so that the rotation axis thereof is horizontal and perpendicular to the width direction of the car 1.

A car-side rope hitch (not shown) is provided near the car guide rail 8a of the upper support body 13. The 1 st end of the suspension body 3 is connected to the car-side rope end combination. A counterweight-side rope hitch 16 is provided in a portion of the upper support body 13 between the counterweight sheave 15 and the counterweight guide rail 9 a. The 2 nd end of the suspension body 3 is connected to the counterweight-side hitch 16.

The suspension body 3 is wound around the 1 st car suspension wheel 11a, the 2 nd car suspension wheel 11b, the car return sheave 14, the drive sheave 7, the counterweight return sheave 15, and the counterweight suspension wheel 12 in this order from the 1 st end side. That is, the elevator of fig. 1 and 2 has a rope ratio of 2: 1-mode elevator.

Fig. 3 is a perspective view schematically showing a support structure of the car return sheave 14 and the counterweight return sheave 15 in fig. 2. The car return sheave 14 is disposed below the upper support body 13 in the vicinity of the car guide rail 8 b. The upper support body 13 has 1 st and 2 nd diverting sheave beams 17a and 17b disposed at a distance from each other. The diverting sheave beams 17a and 17b are disposed horizontally and parallel to the width direction of the car 1. The counterweight diverting pulley 15 is disposed between the diverting pulley beams 17a, 17 b.

Next, a method of retrofitting the existing machine room-less elevator described above will be described. Fig. 4 is a plan view schematically showing a state after refitting the elevator without a machine room of fig. 1, and fig. 5 is a front view schematically showing the elevator without a machine room of fig. 4. In the retrofitting method of embodiment 1, the counterweight sheave 15 is detached from the upper support body 13, and a new hoisting machine (upper hoisting machine) 21 is installed at a position of the upper support body 13 where the counterweight sheave 15 was installed.

The drive sheave 7 of the hoisting machine (lower hoisting machine) 5 in the lower part of the hoistway 4 is used as a lower return sheave of the modified elevator. Further, the loop portion is removed from the hoisting machine 5 in the lower portion of the hoistway 4, and the magnetic resistance against the rotation of the drive sheave 7 is eliminated. That is, in the refitted elevator, the hoisting machine 5 generates no driving force and is used only as the lower return sheave. Then, the car 1 and the counterweight 2 are raised and lowered by the driving force of the new hoisting machine 21.

The new hoisting machine 21 is a thin hoisting machine whose axial dimension is smaller than the dimension in the direction perpendicular to the axial direction. The new hoisting machine 21 includes a hoisting machine main body 22 and a drive sheave 23. The hoisting machine main body 22 includes a motor that rotates the drive sheave 23, and a brake that brakes the rotation of the drive sheave 23. The hoisting machine 21 is disposed such that the rotation axis of the drive sheave 23 is horizontal and perpendicular to the width direction of the car 1.

The suspension body 3 is wound around the 1 st car hanging wheel 11a, the 2 nd car hanging wheel 11b, the car diverting pulley 14, the drive sheave (lower diverting pulley) 7, the drive sheave 23 of the new hoisting machine 21, and the counterweight hanging wheel 12 in this order from the 1 st end side. That is, the elevator of fig. 4 and 5 is also 2: 1 roping ratio type elevator.

Fig. 6 is a perspective view showing an outline of a support structure of the hoisting machine 21 of fig. 5. The hoisting machine main body 22 is supported by the 2 nd sheave beam 17b, and the drive sheave 23 is disposed directly above the space between the sheave beams 17a and 17 b. Thereby, the portion of the suspension body 3 directed downward from the drive sheave 23 passes through the space between the return sheave beams 17a and 17 b. The other structures are the same as before the modification, but can be replaced by new equipment according to the requirement.

In the method of retrofitting such a machine roomless elevator, since the new hoisting machine 21 is installed at a position where the counterweight return sheave 15 is disposed in the upper part in the hoistway 4, the hoisting machine 21 having a mounting size and an external size different from those before the retrofitting can be installed by various devices. This enables the use of the latest hoisting machine 21 and the reduction of the retrofitting period.

Further, since the hoisting machine 21 can be disposed at the upper portion in the hoistway 4, the hoisting machine 21 is not wetted by water even if water enters the pit.

Further, since the drive sheave 7 of the existing hoisting machine 5 is used as the lower return sheave of the modified elevator, the drive sheave 7 can be left as it is even after the power of the hoisting machine 5 is cut off, and waste can be reduced.

Further, since the resistance is eliminated by removing the loop portion of the existing hoisting machine 5, no excessive load is applied even if the drive sheave 7 is used as the lower return sheave.

Further, since a thin hoisting machine is used as the new hoisting machine 21, the hoisting machine 21 can be easily installed in the space where the counterweight sheave 15 is installed.

In fig. 6, the hoisting machine 21 is directly provided on the diverting sheave beam 17b, but for example, as shown in fig. 7, a pair of hoisting machines 24a and 24b may be provided between the diverting sheave beams 17a and 17b, and the hoisting machine 21 may be provided on the hoisting machines 24a and 24 b. That is, the hoisting machine 21 may be installed on the diverting sheave beams 17a and 17b via the hoisting machine bases 24a and 24 b. In this case, the load applied to the hoisting machine 21 can be applied to the sheave beams 17a and 17b in a dispersed manner, and the stress generated in the sheave beams 17a and 17b can be made close to that before the conversion.

In the above example, the hoisting machine 21 is provided so that the drive sheave 23 faces the car 1 side, but the hoisting machine 21 may be provided so that the drive sheave 23 faces the opposite side to the car 1, that is, so that the hoisting machine main body 22 faces the car 1 side. In this case, maintenance and inspection of the hoisting machine main body 22 can be easily performed from above the car 1.

In the above example, the counterweight sheave 15 and the new hoisting machine 21 are replaced, but the car sheave 14 and the new hoisting machine 21 may be replaced according to the layout of the equipment disposed in the upper portion of the hoistway 4.

Instead of using the drive sheave 7 of the existing hoisting machine 5 as a return sheave, the hoisting machine 5 may be removed and a new return sheave may be installed at the lower part of the hoistway 4.

In the above example, the long-sized hoisting machine is shown as the existing hoisting machine 5, but the existing hoisting machine may be a thin hoisting machine.

Claims (10)

1. A method of retrofitting a machine roomless elevator having: a car; a counterweight; a suspension body that suspends the car and the counterweight; an existing hoisting machine which is provided at a lower portion in a hoistway and which raises and lowers the car and the counterweight via the suspension body; an upper support body provided at an upper portion in the hoistway; and an upper return sheave provided on the upper support body and around which the suspension body is wound, wherein the method of retrofitting a machine-roomless elevator includes:

removing the upper diverting sheave from the upper support body; and

a new hoisting machine is installed on the upper support body such that a rotation shaft of the drive sheave is horizontal and perpendicular to the width direction of the car.

2. The modernization method of a machineroom-less elevator according to claim 1, wherein,

the drive sheave of the existing hoisting machine is used as the lower diverting sheave of the modified elevator.

3. The modernization method of a machineroom-less elevator according to claim 2, wherein,

the refitting method of the elevator without the machine room further comprises the following procedures:

the resistance is eliminated by detaching the loop part of the existing hoisting machine.

4. The modernization method of a machineroom-less elevator according to any one of claims 1 to 3, wherein,

the existing hoisting machine is a long-sized hoisting machine with the axial dimension larger than the dimension in the direction vertical to the axial direction, or a thin hoisting machine with the axial dimension smaller than the dimension in the direction vertical to the axial direction,

the new hoist is a thin hoist having an axial dimension smaller than a dimension in a direction perpendicular to the axial direction.

5. The modernization method of a machineroom-less elevator according to any one of claims 1 to 3, wherein,

the upper support body has a 1 st diverting pulley beam and a 2 nd diverting pulley beam which are arranged with a space between them,

after the upper diverting sheave is detached from the upper support body, a hoisting machine stand is installed between the 1 st diverting sheave beam and the 2 nd diverting sheave beam, and the new hoisting machine is installed on the hoisting machine stand.

6. A machine room-less elevator, wherein the machine room-less elevator has:

a car;

a counterweight;

a suspension body that suspends the car and the counterweight;

a new hoisting machine which is provided in an upper portion of the hoistway such that a rotation shaft of the drive sheave is horizontal and perpendicular to a width direction of the car, and which raises and lowers the car and the counterweight via the suspension body; and

an existing hoisting machine provided at a lower portion in the hoistway,

the existing hoisting machine generates no driving force and is used as a lower return sheave.

7. The machine roomless elevator according to claim 6,

the loop part of the existing hoisting machine is detached.

8. The machine roomless elevator according to claim 6 or 7,

the existing hoisting machine is a long-sized hoisting machine with the axial dimension larger than the dimension in the direction vertical to the axial direction, or a thin hoisting machine with the axial dimension smaller than the dimension in the direction vertical to the axial direction,

the new hoist is a thin hoist having an axial dimension smaller than a dimension in a direction perpendicular to the axial direction.

9. A machine room-less elevator, wherein the machine room-less elevator has:

a car;

a counterweight;

a suspension body that suspends the car and the counterweight;

an upper hoisting machine which is provided in an upper portion of the hoistway such that a rotation shaft of the drive sheave is horizontal and perpendicular to a width direction of the car, and which raises and lowers the car and the counterweight via the suspension body; and

a lower hoisting machine provided at a lower portion in the hoistway,

the lower traction machine generates no driving force and is used as a lower diverting pulley,

wherein the loop part of the lower traction machine is disassembled.

10. The machine roomless elevator according to claim 9,

the lower traction machine is a long traction machine with an axial dimension larger than the dimension in the direction perpendicular to the axial direction, or a thin traction machine with an axial dimension smaller than the dimension in the direction perpendicular to the axial direction,

the upper hoist is a thin hoist having an axial dimension smaller than a dimension in a direction perpendicular to the axial direction.