HK1204469B - Elevator and method for modifying elevator - Google Patents

Abstract

An elevator has an elevator car (6) and a counterbalance (7), which are suspended by a main rope (15) passed over a drive pulley (14), over an elevator car suspension wheel (8), and over a counterbalance suspension wheel (9). The main rope (15), which leads from the drive pulley (14) to an elevator car-side rope anchor section (16), is passed over the elevator car suspension wheel (8) from the side of the elevator car suspension wheel (8) which is away from the drive pulley (14) in the horizontal direction. A first main rope section (15a) which is located between the drive pulley (14) and the elevator car suspension wheel (8) and a second main rope section (15b) which is located between the elevator car suspension wheel (8) and the elevator car-side rope anchor section (16) are passed through a common, elevator car-side through-hole (4) and intersect each other when viewed in the direction of the axis of the drive pulley (14). The counterbalance (7) side is identically configured.

Description

Elevator and method for modifying elevator

Technical Field

The present invention relates to an elevator in which a car and a counterweight are suspended by a main rope wound around a car sheave provided on the car and a counterweight sheave provided on the counterweight, and a method of modernizing an elevator.

Background

Conventionally, in order to miniaturize a hoisting machine, there has been proposed a method of modifying an elevator in which a suspension system of a main rope to a car and a counterweight is 1:1 to an elevator in which a suspension system of a main rope to a car and a counterweight is 4: 1. In the modified elevator, a car hoisting wheel is provided in a car, a counterweight hoisting wheel is provided in a counterweight, and a hoisting machine and two steering wheels are provided in a machine room located in an upper part of a hoistway. The car and the counterweight of the modified elevator are suspended in the hoistway by a drive sheave of the hoisting machine, two steering wheels, and a main rope wound around a car hoist sheave and a counterweight hoist sheave. In the modified elevator, the main rope from the drive sheave to the car sheave and the main rope from the car sheave to one of the diverting pulleys are passed through a common through hole provided in the floor of the machine room (see, for example, patent documents 1 and 2).

Documents of the prior art

Patent document

Patent document 1: japanese Kokai publication No. 2007-514622

Patent document 2: japanese Kokai publication No. 2007-514623

Disclosure of Invention

Problems to be solved by the invention

However, in the conventional modified elevator, since the main ropes from the drive sheave are wound around the car hoist from the side close to the drive sheave in the horizontal direction, when the main ropes from the drive sheave to the car hoist and the main ropes from the car hoist to one diverting sheave are passed through a common through hole, the position of the diverting sheave in the machine room approaches the position of the hoisting machine, and the diverting sheave interferes with the hoisting machine. On the other hand, in order to avoid interference between the hoisting machine and the steerable wheels, when the steerable wheels are horizontally displaced from the position of the hoisting machine, the distance between the main ropes passing through the common through-hole is increased, and it is necessary to perform a construction for increasing the through-hole provided in the machine room. This results in a time consuming refitting work of the elevator.

The present invention has been made to solve the above-described problems, and an object thereof is to provide an elevator and an elevator modernization method that can facilitate installation work.

Means for solving the problems

The elevator of the invention comprises: a car that can be raised and lowered in a hoistway; a car hanging wheel arranged on the upper part of the car; a counterweight that can be raised and lowered in the hoistway; a counterweight hanging wheel arranged on the upper part of the counterweight; a drive device having a drive sheave, the drive device being provided in a machine room located at an upper part of a hoistway and generating a drive force for raising and lowering a car and a counterweight; and main ropes connected to a car-side head combination portion and a counterweight-side head combination portion provided in the machine room, respectively, and wound around the drive sheave, the car hoisting wheel, and the counterweight hoisting wheel to suspend the car and the counterweight, wherein the main rope from the drive sheave toward the car-side head combination portion is wound around the car hoisting wheel from a side farther from the drive sheave than the car hoisting wheel in the horizontal direction, and the main rope from the drive sheave toward the counterweight-side head combination portion is wound around the counterweight hoisting wheel from a side farther from the drive sheave than the counterweight hoisting wheel in the horizontal direction, and the main rope includes: a 1 st main rope part which is positioned between the driving rope wheel and the car hanging wheel; a 2 nd main rope portion located between the car suspending sheave and the car-side rope head combining portion; a 3 rd main rope part which is positioned between the driving rope wheel and the counter-weight hanging wheel; and a 4 th main rope portion which is located between the counterweight suspending sheave and the counterweight-side head combination portion, wherein the 1 st main rope portion and the 2 nd main rope portion pass through a common car-side through hole provided in a machine room floor that separates the hoistway and the machine room and cross each other when viewed in the axial direction of the drive sheave, and the 3 rd main rope portion and the 4 th main rope portion pass through a common counterweight-side through hole provided in the machine room floor and cross each other when viewed in the axial direction of the drive sheave.

The refitting method of the elevator changes the hanging mode of the main rope to the car and the counterweight from 1:1 to 2:1, and comprises the following steps: a lift car hanging wheel mounting procedure, wherein a lift car hanging wheel is mounted at the upper part of the lift car; a counterweight hanging wheel mounting step of mounting a counterweight hanging wheel on the upper part of the counterweight; and a hanging step of connecting the main rope to a car-side rope end combination portion and a counterweight-side rope end combination portion provided in a machine room located at an upper portion of the hoistway, and winding the main rope around a car sheave, a counterweight sheave, and a drive sheave of a drive device provided in the machine room, thereby hanging the car and the counterweight by the main rope, wherein in the hanging step, the main rope from the drive sheave toward the car-side rope end combination portion is wound around the car sheave from a side farther from the drive sheave than the car sheave in the horizontal direction, and the main rope from the drive sheave toward the counterweight-side rope end combination portion is wound around the counterweight sheave from a side farther from the drive sheave than the counterweight sheave in the horizontal direction, and the main rope provided in the hanging step has: a 1 st main rope part which is positioned between the driving rope wheel and the car hanging wheel; a 2 nd main rope portion located between the car suspending sheave and the car-side rope head combining portion; a 3 rd main rope part which is positioned between the driving rope wheel and the counter-weight hanging wheel; and a 4 th main rope portion which is located between the counterweight suspending sheave and the counterweight-side head combination portion, wherein the 1 st main rope portion and the 2 nd main rope portion pass through a common car-side through hole provided in a machine room floor that separates the hoistway and the machine room and cross each other when viewed in the axial direction of the drive sheave, and the 3 rd main rope portion and the 4 th main rope portion pass through a common counterweight-side through hole provided in the machine room floor and cross each other when viewed in the axial direction of the drive sheave.

Effects of the invention

According to the elevator and the method for retrofitting an elevator of the present invention, it is possible to avoid interference of the car-side and counterweight-side head combination portions with the drive device, respectively, and to reduce the distance between the 1 st and 2 nd main rope portions at the position of the car-side through hole and to reduce the distance between the 3 rd and 4 th main rope portions at the position of the counterweight-side through hole. Therefore, the installation work of the elevator can be easily performed.

Drawings

Fig. 1 is a vertical cross-sectional view showing an elevator according to embodiment 1 of the present invention.

Fig. 2 is a plan view showing the elevator of fig. 1.

Fig. 3 is a horizontal cross-sectional view of a portion where the 1 st main rope portion and the 2 nd main rope portion in fig. 1 intersect.

Fig. 4 is a vertical cross-sectional view showing an elevator of comparative example 1.

Fig. 5 is a vertical cross-sectional view showing an elevator of comparative example 2.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment mode 1

Fig. 1 is a vertical cross-sectional view showing an elevator according to embodiment 1 of the present invention. Fig. 2 is a plan view showing the elevator shown in fig. 1. In the figure, a machine room 2 is provided in an upper part of a hoistway 1. The hoistway 1 and the machine room 2 are separated by a machine room floor (partition wall) 3 disposed horizontally. A car-side through hole 4 and a counterweight-side through hole 5, which pass through the machine room floor 3, are provided separately from each other in the machine room floor 3. In this example, as shown in fig. 2, the car-side through hole 4 and the counterweight-side through hole 5 are provided apart from each other in the depth direction of the hoistway 1, and the cross-sectional shapes of the car-side through hole 4 and the counterweight-side through hole 5 are rectangular.

A pair of car guide rails facing each other in the width direction of the hoistway 1 and a pair of counterweight guide rails facing each other in the width direction of the hoistway 1 (both not shown) are provided in the hoistway 1. The car 6 is disposed between the pair of car guide rails so as to be able to ascend and descend, and the counterweight 7 is disposed between the pair of counterweight guide rails so as to be able to ascend and descend. The car 6 is guided by car guide rails to move up and down in the hoistway 1, and the counterweight 7 is guided by counterweight guide rails to move up and down in the hoistway 1. When the hoistway 1 is viewed in the vertical direction, as shown in fig. 2, the car 6 and the counterweight 7 are arranged in the hoistway 1 so as to be spaced apart from each other in the depth direction of the hoistway 1.

A car hanging wheel 8 is provided on the upper portion of the car 6 so as to be rotatable about a horizontally disposed rotation shaft. A counterweight suspending wheel 9 is rotatably provided on the upper portion of the counterweight 7 about a horizontally disposed rotation shaft. In this example, the axes of the car hanging sheave 8 and the counterweight hanging sheave 9 are parallel to each other in the width direction of the hoistway 1. In this example, the outer diameter of the car hanging wheel 8 is larger than the width of the car-side through hole 4, and the outer diameter of the counterweight hanging wheel 9 is larger than the width of the counterweight-side through hole 5.

A hoist 10 and a deflector sheave 11 are provided in the machine room 2. The traction machine 10 and the deflector sheave 11 are supported by a machine table 12 fixed on the machine room floor 3.

The hoisting machine 10 is a driving device that generates a driving force for raising and lowering the car 6 and the counterweight 7. The hoisting machine 10 includes a hoisting machine main body (driving device main body) 13 including a motor, and a drive sheave 14 provided in the hoisting machine main body 13, and the drive sheave 14 is rotated by a driving force of the hoisting machine main body 13. The drive sheave 14 rotates about a rotation shaft horizontally provided in the hoisting machine main body 13. In this example, the axis of the drive sheave 14 coincides with the width direction of the hoistway 1. Therefore, in this example, the respective axes of the car hanging sheave 8 and the counter-weight hanging sheave 9 are parallel to the axis of the drive sheave 14.

The deflector sheave 11 is disposed at a position lower than the drive sheave 14 and apart from the drive sheave 14 at a position shifted from the drive sheave 14 in the horizontal direction. The axis of the deflector sheave 11 is parallel to the axis of the drive sheave 14.

The car 6 and the counterweight 7 are suspended in the hoistway 1 by a plurality of main ropes 15. The main ropes 15 are, for example, steel ropes or belts. The machine room 2 is internally provided with: a car-side rope hitch (rope hook) 16 connected to one end of the main rope 15; and a counterweight-side head combination portion (counterweight-side rope coupling) 17 connected to the other end portion of the main rope 15. The car-side and counterweight-side rope hitch 16 and 17 are supported on the machine base 12.

The main ropes 15 are wound around the car sheave 8, the drive sheave 14, the deflector sheave 11, and the counterweight sheave 9 in this order from one end connected to the car-side head combination portion 16 to the other end connected to the counterweight-side head combination portion 17. That is, in the elevator of the present embodiment, the suspension system of the main ropes 15 to the car 6 and the counterweight 7 is the roping ratio 2:1 system. A plurality of grooves into which the main ropes 15 are fitted are provided in the outer circumferential portions of the drive sheave 14, the deflector sheave 11, the car hanging sheave 8, and the counterweight hanging sheave 9.

As shown in fig. 1, the drive sheave 14 and the deflector sheave 11 are disposed in a range between a vertical line (car hanging sheave vertical line) a passing through the axis of the car hanging sheave 8 and a vertical line (counterweight hanging sheave vertical line) B passing through the axis of the counterweight hanging sheave 9 when viewed in the axial direction of the drive sheave 14.

In this example, as shown in fig. 1, when viewed in the axial direction of the drive sheave 14, one end portion of the drive sheave 14 in the horizontal direction is inserted into a range R between a vertical line P of the car-side through hole 4 passing through the edge portion on the drive sheave 14 side (a vertical line of the car-side through hole) and a vertical line a of the car-suspending sheave. In this example, when viewed in the axial direction of the drive sheave 14, one end portion of the deflector sheave 11 in the horizontal direction is inserted into a range S between a vertical line Q (counterweight-side through-hole vertical line) passing through the edge portion of the counterweight-side through hole 5 on the drive sheave 14 side and a counterweight suspending sheave vertical line B.

In this example, the center lines of the car-side through hole 4 and the car guide rail coincide with a car hanging wheel vertical line a when viewed in the axial direction of the drive sheave 14, and the center lines of the counterweight-side through hole 5 and the counterweight guide rail coincide with a counterweight hanging wheel vertical line B when viewed in the axial direction of the drive sheave 14.

As shown in fig. 1, when viewed in the axial direction of the drive sheave 14, the main ropes 15 extending from the drive sheave 14 toward the car-side head combination portion 16 are wound around the car hanging sheave 8 from a side farther from the vertical line C than the car hanging sheave 8 toward a side closer to the vertical line C than the car hanging sheave 8, with reference to a vertical line (drive sheave vertical line) C passing through the axis of the drive sheave 14. That is, the main ropes 15 extending from the drive sheave 14 to the car-side head combination portion 16 are wound around the car sheave 8 from a side farther from the drive sheave 14 than the car sheave 8 in the horizontal direction to a side closer to the drive sheave 14 than the car sheave 8.

When viewed in the axial direction of the drive sheave 14, the main ropes 15 extending from the drive sheave 14 to the counterweight-side head combination portion 17 are wound around the counterweight hanging wheel 9 from a side farther from the vertical line C than the counterweight hanging wheel 9 toward a side closer to the vertical line C than the counterweight hanging wheel 9 with reference to the drive sheave vertical line C. That is, the main ropes 15 extending from the drive sheave 14 to the counterweight-side head combination portion 17 are wound around the counterweight hoisting sheave 9 from the side farther from the drive sheave 14 than the counterweight hoisting sheave 9 in the horizontal direction to the side closer to the drive sheave 14 than the counterweight hoisting sheave 9.

As shown in fig. 1, the main rope 15 includes: a 1 st main rope portion 15a located between the drive sheave 14 and the car hanging sheave 8; a 2 nd main rope portion 15b located between the car sheave 8 and the car-side head combination portion 16; a 3 rd main rope portion 15c positioned between the drive sheave 14 and the counterweight suspending sheave 9; and a 4 th main rope portion 15d located between the counterweight suspending sheave 9 and the counterweight-side head assembly portion 17. The 3 rd main rope portion 15c is wound around the deflector pulley 11.

The 1 st main rope portion 15a and the 2 nd main rope portion 15b pass through the common car-side through hole 4. Also, as shown in fig. 1, the 1 st main rope portion 15a and the 2 nd main rope portion 15b intersect with each other when viewed in the axial direction of the drive sheave 14. The car-side sheave combination portion 16 is disposed at a position distant from the drive sheave 14 in the horizontal direction with respect to the car sheave vertical line a when viewed in the axial direction of the drive sheave 14.

The 3 rd main rope portion 15c and the 4 th main rope portion 15d pass through the common counterweight-side through hole 5. Also, as shown in fig. 1, the 3 rd main rope portion 15c and the 4 th main rope portion 15d intersect with each other when viewed in the axial direction of the drive sheave 14. The counterweight-side sheave assembly portion 17 is disposed at a position farther from the drive sheave 14 than the counterweight hoisting sheave vertical line B in the horizontal direction as viewed in the axial direction of the drive sheave 14.

That is, the car-side and counterweight-side sheave combining portions 16 and 17 are disposed outside the range between the car sheave plumb line a and the counterweight sheave plumb line B as viewed in the axial direction of the drive sheave 14.

Fig. 3 is a horizontal sectional view at a portion where the 1 st main rope portion 15a and the 2 nd main rope portion 15b in fig. 1 intersect with each other. As shown in fig. 3, in this example, 4 1 st main rope portions 15a and 4 2 nd main rope portions 15b pass through the common car-side penetration hole 4. The 1 st main rope portions 15a are arranged in the thickness direction of the drive sheave 14 (i.e., the axial direction of the drive sheave 14) corresponding to the pitch of the grooves of the drive sheave 14. Each of the 1 st main rope portions 15a is disposed within the range of the thickness of the drive sheave 14. On the other hand, the 2 nd main rope portions 15b are disposed outside the range of the thickness of the drive sheave 14 so as not to contact the 1 st main rope portions 15 a. In this example, two second 2 nd main rope portions 15b are disposed apart from each other on both sides of a range in which the 1 st main rope portions 15a are disposed in a direction in which the 1 st main rope portions 15a are aligned (in a thickness direction of the drive sheave 14). The inclination of each 2 nd main rope portion 15b in the thickness direction of the drive sheave 14 is larger than that of the 1 st main rope portion 15a, thereby avoiding contact with the 1 st main rope portion 15 a.

In this example, the 4 3 rd main rope portions 15c and the 4 th main rope portions 15d pass through the common counterweight-side through hole 5. The positional relationship between the 3 rd main rope portion 15c and the 4 th main rope portion 15d is the same as the positional relationship between the 1 st main rope portion 15a and the 2 nd main rope portion 15b, but is not illustrated. That is, the 3 rd main rope portions 15c are arranged in the thickness direction of the drive sheave 14 corresponding to the pitch of the grooves of the drive sheave 14. Each of the 3 rd main rope portions 15c is disposed within the range of the thickness of the drive sheave 14. On the other hand, the 4 th main rope portions 15d are disposed outside the range of the thickness of the drive sheave 14. In this example, two 4 th main rope portions 15d are disposed apart from each other on both sides of a range in which the 3 rd main rope portions 15c are disposed in a direction in which the 3 rd main rope portions 15c are arranged (in a thickness direction of the drive sheave 14). The 4 th main rope portion 15d has a larger inclination in the thickness direction of the drive sheave 14 than the 3 rd main rope portion 15c, thereby avoiding contact with the 3 rd main rope portion 15 c.

That is, the 1 st and 3 rd main rope portions 15a and 15c extending from the drive sheave 14 are disposed within the range of the thickness of the drive sheave 14, and the 2 nd and 4 th main rope portions 15b and 15d connected to the car-side and counterweight-side sheave assembly portions 16 and 17, respectively, are disposed outside the range of the thickness of the drive sheave 14.

When the drive sheave 14 is rotated by the driving force of the hoisting machine 10, the 1 st main rope portion 15a and the 3 rd main rope portion 15c move in the respective longitudinal directions. Thereby, the car 6 and the counterweight 7 are lifted and lowered. At this time, the 2 nd main rope portion 15b and the 4 th main rope portion 15d are connected to the car-side head combination portion 16 and the counterweight-side head combination portion 17, respectively, and therefore do not move in the longitudinal direction of the main ropes 15.

Next, a method of retrofitting an elevator in which an elevator before retrofitting (i.e., a method of suspending a main rope to a car 6 and a counterweight 7 in a roping ratio of 1: 1) is changed to an elevator after retrofitting (i.e., a method of suspending a main rope to a car 6 and a counterweight 7 in a roping ratio of 2: 1) in which the car 6 and the counterweight 7 are suspended by the main rope having one end connected to the car 6 and the other end connected to the counterweight 7 in the elevator before retrofitting, and the car 6 and the counterweight 7 are suspended by the main rope wound around a car sheave 8 provided on the car 6 and a counterweight sheave 9 provided on the counterweight 7 in the elevator after retrofitting will be described.

In a retrofit construction in which the suspension manner of the main rope to the car 6 and the counterweight 7 is changed from 1:1 to 2:1, the car 6 and the counterweight 7 are first supported by the support member so that the car 6 and the counterweight 7 do not fall. Then, the existing hoisting machine, deflector sheave, main rope, etc. before the modification are removed.

Then, a new car hanging wheel 8 is attached to the upper portion of the car 6 (car hanging wheel attaching step), and a new counterweight hanging wheel 9 is attached to the upper portion of the counterweight 7 (counterweight hanging wheel attaching step). Further, a new hoisting machine 10 and a new deflector sheave 11 are installed on the machine base 12 in the machine room 2 (equipment installation step).

Then, the main rope 15 is passed through the existing car-side through hole 4 and the existing counterweight-side through hole 5 provided in the machine room floor 3, the main rope 15 is wound around the drive sheave 14, the deflector sheave 11, the car sheave 8, and the counterweight sheave 9 of the hoisting machine 10, and one end portion and the other end portion of the main rope 15 are connected to the car-side rope head combining portion 16 and the counterweight-side rope head combining portion 17 provided on the machine base 12 in the machine room 2, respectively.

At this time, as shown in fig. 1, the main ropes 15 from the drive sheave 14 toward the car-side head combination portion 16 are wound around the car sheave 8 from the side farther from the drive sheave 14 than the car sheave 8 in the horizontal direction, and the main ropes 15 from the drive sheave 14 toward the counter-weight-side head combination portion 17 are wound around the counter-weight sheave 9 from the side farther from the drive sheave 14 than the counter-weight sheave 9 in the horizontal direction. Then, the 1 st main rope portion 15a and the 2 nd main rope portion 15b of the main rope 15 are passed through the common car-side through hole 4, and the 3 rd main rope portion 15c and the 4 th main rope portion 15d of the main rope 15 are passed through the common counterweight-side through hole 5. In addition, when the main ropes 15 are viewed in the axial direction of the drive sheave 14, the 1 st main rope portion 15a and the 2 nd main rope portion 15b of the main ropes 15 intersect, and the 3 rd main rope portion 15c and the 4 th main rope portion 15d of the main ropes 15 intersect.

Then, the support member that supports the car 6 and the counterweight 7 is removed, and the car 6 and the counterweight 7 are suspended by the main ropes 15 (suspension step). In this way, the suspension of the main ropes to the car 6 and the counterweight 7 is changed from 1:1 to 2: 1.

In such an elevator, the main rope 15 from the drive sheave 14 toward the car-side head combination portion 16 is wound around the car sheave 8 from the side farther from the drive sheave 14 than the car sheave 8 in the horizontal direction, and the main rope 15 from the drive sheave 14 toward the counterweight-side head combination portion 17 is wound around the counterweight sheave 9 from the side farther from the drive sheave 14 than the counterweight sheave 9 in the horizontal direction, and when viewed in the axial direction of the drive sheave 14, the 1 st and 2 nd main rope portions 15a and 15b of the main rope 15 cross each other, and the 3 rd and 4 th main rope portions 15c and 15d cross each other, so that it is possible to avoid interference of the car-side head combination portion 16 and the counterweight-side head combination portion 17 with the hoisting machine 10, respectively, to reduce the distance between the 1 st and 2 nd main rope portions 15a at the position of the car-side through hole 4, and the distance between the 3 rd main rope portion 15c and the 4 th main rope portion 15d is reduced at the position of the counterweight side through hole 5. Thus, the cage-side and counterweight-side rope hitch 16 and 17 can be easily installed, and the 1 st and 2 nd main rope portions 15a and 15b and the 3 rd and 4 th main rope portions 15c and 15d can be easily passed through the common counterweight-side through hole 5. In particular, when a retrofitting operation is performed in which the suspension system of the main ropes 15 with respect to the car 6 and the counterweight 7 is changed from 1:1 to 2:1, the necessity of enlarging the car-side through hole 4 and the counterweight-side through hole 5 and adding another through hole to the machine room floor 3 can be reduced. In addition, the main ropes 15 are suspended to the car 6 and the counterweight 7 in a roping ratio of 2: mode 1 can therefore achieve a reduction in size of the hoisting machine 10, and facilitate hoisting work of the hoisting machine 10 and the like. Further, the work space in the machine room 2 can be easily secured, and the workability in the machine room 2 can be improved. Therefore, the installation work of the elevator can be easily performed.

Further, when the car-side through hole 4 is viewed in the up-down direction, the 1 st main rope portion 15a is disposed within the range of the thickness of the drive sheave 14, the 2 nd main rope portion 15b is disposed outside the range of the thickness of the drive sheave 14, and when the counterweight-side through hole 5 is viewed in the up-down direction, the 3 rd main rope portion 15c is disposed within the range of the thickness of the drive sheave 14, and the 4 th main rope portion 15d is disposed outside the range of the thickness of the drive sheave 14, so that the 1 st and 3 rd main rope portions 15a, 15c moving when the car 6 and the counterweight 7 ascend and descend can be prevented from being greatly inclined in the thickness direction of the drive sheave 14, and the 1 st and 2 nd main rope portions 15a, 15b can be made to cross each other, and the 3 rd and 4 th main rope portions 15c, 15d can be made to cross each other. This enables the main ropes 15 to move more smoothly over the drive sheave 14, the car hanging sheave 8, and the counterweight hanging sheave 9, and enables the car 6 and the counterweight 7 to move more smoothly.

Further, the drive sheave 14 is disposed within a range between the car hanging wheel plumb line a and the counterweight hanging wheel plumb line B as viewed in the axial direction of the drive sheave 14, and the car-side and counterweight-side rope head combining portions 16 and 17 are disposed outside the range between the car hanging wheel plumb line a and the counterweight hanging wheel plumb line B as viewed in the axial direction of the drive sheave 14, so that the car-side and counterweight-side rope head combining portions 16 and 17 can be more reliably prevented from interfering with the hoisting machine 10, respectively.

Further, since the one end portion of the drive sheave 14 in the horizontal direction is inserted into the range R between the car-side through-hole vertical line P and the car hanging sheave vertical line a when viewed in the axial direction of the drive sheave 14, the main rope portions 15 can be prevented from coming into contact with the inner surface of the car-side through hole 4 even when the direction of the 1 st main rope portion 15a approaches the vertical direction due to the lowering of the car 6 or the inclination angle of the 1 st main rope portion 15a increases due to the raising of the car 6.

Further, when viewed in the axial direction of the drive sheave 14, one end portion of the deflector sheave 11 in the horizontal direction is inserted into the range S between the counterweight-side through-hole vertical line Q and the counterweight suspending sheave vertical line B, and therefore, even when the direction of the 3 rd main rope portion 15c approaches the vertical direction due to the lowering of the counterweight 7 or the inclination angle of the 3 rd main rope portion 15c increases due to the raising of the counterweight 7, the main rope portion 15 can be prevented from contacting the inner surface of the counterweight-side through-hole 5.

In addition, in the elevator refitting construction for changing the hanging mode of the main rope 15 to the car 6 and the counterweight 7 from 1:1 to 2:1, the main ropes 15 from the drive sheave 14 toward the car-side head combination portion 16 are wound around the car sheave 8 from a side farther from the drive sheave 14 than the car sheave 8, and the main ropes 15 from the drive sheave 14 toward the counterweight-side head combination portion 17 are wound around the counterweight hoisting wheel 9 from the side farther from the drive sheave 14 than the counterweight hoisting wheel 9, thus, the interference of the car-side and counterweight-side rope hitch portions 16 and 17 with the hoisting machine 10 is avoided, the distance between the 1 st and 2 nd main rope portions 15a and 15b can be reduced at the position of the car-side through-hole 4, and the distance between the 3 rd main rope portion 15c and the 4 th main rope portion 15d is reduced at the position of the counterweight-side through hole 5. This makes it possible to easily provide the car-side rope end combination portion 16 and the counterweight-side rope end combination portion 17, and to reduce the necessity of enlarging the car-side through hole 4 and the counterweight-side through hole 5 and adding another through hole to the machine room floor 3. Thus, the installation work of the elevator can be easily performed, and the refitting work of the elevator can be easily performed.

Comparative examples 1 and 2 for comparison with the present invention are explained below. Fig. 4 is a vertical cross-sectional view showing an elevator of comparative example 1. Fig. 5 is a vertical cross-sectional view showing an elevator of comparative example 2. In comparative examples 1 and 2, the main ropes 15 extending from the drive sheave 14 to the car-side head combination portion 16 are wound around the car hanging sheave 8 from the side closer to the vertical line C than the car hanging sheave 8 with respect to the drive sheave vertical line C when viewed in the axial direction of the drive sheave 14. In comparative examples 1 and 2, the main ropes 15 extending from the drive sheave 14 to the counterweight-side head combination portion 17 are wound around the counterweight suspending wheel 9 on the side closer to the vertical line C than the counterweight suspending wheel 9 with respect to the drive sheave vertical line C when viewed in the axial direction of the drive sheave 14. In comparative examples 1 and 2, when the main ropes 15 are viewed in the axial direction of the drive sheave 14, there is no portion where the main ropes 15 cross each other.

In comparative example 1, as shown in fig. 4, the car-side and counterweight-side head combination portions 16 and 17 are provided so as to avoid interference with the hoisting machine 10. In contrast, in comparative example 2, as shown in fig. 5, the main ropes 15 are provided so as to avoid interference with the car-side through-hole 4 and the counterweight-side through-hole 5.

In comparative example 1, when the car-side and counterweight-side head portions 16 and 17 are provided separately without interfering with the hoisting machine 10, the main ropes 15 interfere with the car-side and counterweight-side through holes 4 and 5, as shown in fig. 4. In comparative example 2, when the main ropes 15 are provided so as to avoid interference with the car side through-holes 4 and the counterweight side through-holes 5, as shown in fig. 5, the car side sheave combination 16 and the counterweight side sheave combination 17 interfere with the hoisting machine 10.

In the above embodiment, the axes of the car hanging sheave 8 and the counter hanging sheave 9 are parallel to the axis of the drive sheave 14, but at least one of the axes of the car hanging sheave 8 and the counter hanging sheave 9 may be inclined with respect to the axis of the drive sheave 14 when the car hanging sheave 8 and the counter hanging sheave 9 are viewed in the vertical direction.

In the above embodiment, the deflector sheave 11 is provided in the machine room 2, but the deflector sheave 11 may be omitted if the main rope 15 does not interfere with the car-side through hole 4 and the counterweight-side through hole 5.

In the above embodiment, the outer diameter of the car hanging wheel 8 is larger than the width of the car-side through hole 4, but the outer diameter of the car hanging wheel 8 may be set to a size equal to or smaller than the width of the car-side through hole 4. In the above embodiment, the outer diameter of the counterweight suspending sheave 9 is larger than the width of the counterweight-side through hole 5, but the outer diameter of the counterweight suspending sheave 9 may be set to a size equal to or smaller than the width of the counterweight-side through hole 5.

Claims (4)

1. An elevator, comprising:

a car that can be raised and lowered in a hoistway;

a car hanging wheel arranged on the upper part of the car;

a counterweight that is liftable in the hoistway;

a counterweight hanging wheel arranged on the upper part of the counterweight;

a drive device having a drive sheave, the drive device being provided in a machine room located at an upper portion of the hoistway and generating a drive force for raising and lowering the car and the counterweight; and

a main rope connected to a car-side head combination portion and a counterweight-side head combination portion provided in the machine room, respectively, and wound around the drive sheave, the car sheave, and the counterweight sheave to suspend the car and the counterweight,

it is characterized in that the preparation method is characterized in that,

the main rope extending from the drive sheave toward the car-side head combination portion is wound around the car hoist wheel from a side farther from the drive sheave than the car hoist wheel in the horizontal direction,

the main rope extending from the drive sheave toward the counterweight-side head combination portion is wound around the counterweight hoisting wheel from a side farther from the drive sheave than the counterweight hoisting wheel in the horizontal direction,

the main rope has: a 1 st main rope portion located between the drive sheave and the car hanging sheave; a 2 nd main rope portion located between the car suspending sheave and the car-side head combination portion; a 3 rd main rope portion positioned between the drive sheave and the counterweight suspending sheave; and a 4 th main rope portion which is positioned between the counterweight hanging wheel and the counterweight-side rope hitch portion,

the 1 st main rope portion and the 2 nd main rope portion pass through a common car-side through hole provided in a machine room floor that separates the hoistway and the machine room, and cross each other when viewed in an axial direction of the drive sheave,

the 3 rd main rope portion and the 4 th main rope portion pass through a common counterweight-side through hole provided in the machine room floor, and cross each other when viewed in an axial direction of the drive sheave.

2. Elevator according to claim 1,

the 1 st main rope portion is disposed within a thickness range of the drive sheave and the 2 nd main rope portion is disposed outside the thickness range of the drive sheave when the car-side through hole is viewed in a vertical direction,

when the counterweight-side through hole is viewed in the vertical direction, the 3 rd main rope portion is disposed within the thickness range of the drive sheave, and the 4 th main rope portion is disposed outside the thickness range of the drive sheave.

3. Elevator according to claim 1 or 2,

the drive sheave is disposed in a range between a car hanging wheel plumb line passing through an axis of the car hanging wheel and a counterweight hanging wheel plumb line passing through an axis of the counterweight hanging wheel when viewed in an axial direction of the drive sheave,

the car-side and counterweight-side sheave combination portions are disposed outside a range between the car sheave plumb line and the counterweight sheave plumb line when viewed in an axis direction of the drive sheave.

4. A method for modifying an elevator, which changes the hanging mode of a main rope to a car and a counterweight from 1:1 to 2:1, is characterized by comprising the following steps:

a car hanging wheel mounting step of mounting a car hanging wheel on an upper part of the car;

a counterweight hanging wheel mounting step of mounting a counterweight hanging wheel on the upper part of the counterweight; and

a suspending step of connecting the main rope to a car-side rope head combination portion and a counterweight-side rope head combination portion provided in a machine room located in an upper portion of a hoistway, and suspending the car and the counterweight by the main rope by winding the main rope around the car sheave, the counterweight sheave, and a drive sheave of a drive device provided in the machine room,

in the suspending step, the main ropes going from the drive sheave to the car-side head combination portion are wound around the car hoisting sheave from a side farther from the drive sheave than the car hoisting sheave in the horizontal direction, and the main ropes going from the drive sheave to the counterweight-side head combination portion are wound around the counterweight hoisting sheave from a side farther from the drive sheave than the counterweight hoisting sheave in the horizontal direction,

the main rope provided in the hanging step includes: a 1 st main rope portion located between the drive sheave and the car hanging sheave; a 2 nd main rope portion located between the car suspending sheave and the car-side head combination portion; a 3 rd main rope portion positioned between the drive sheave and the counterweight suspending sheave; and a 4 th main rope portion which is positioned between the counterweight hanging wheel and the counterweight-side rope hitch portion,

the 1 st main rope portion and the 2 nd main rope portion pass through a common car-side through hole provided in a machine room floor that separates the hoistway and the machine room, and cross each other when viewed in an axial direction of the drive sheave,

the 3 rd main rope portion and the 4 th main rope portion pass through a common counterweight-side through hole provided in the machine room floor, and cross each other when viewed in an axial direction of the drive sheave.