JP2001233572A - Double deck elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make compact and light weight a car frame of a variable type double deck elevator and make easy maintenance of the elevator. SOLUTION: Nuts 28a, 28b are fixed to both right and left sides of cages 24, 25, and the cages 24, 25 are elevated by means of screw shafts 27a, 27b engaging with the nuts 28a, 28b. Bevel gears are provided at a lower end of the screw shaft 27a and an upper end of the screw shaft 27b, and they are driven by bevel gears connected to a motor 34 to thereby the screw shafts 27a, 27b simultaneously in the opposite directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called variable double-deck elevator in which an upper cab and a lower cab can simultaneously move up and down in opposite directions.

[0002]

2. Description of the Related Art With the rise of buildings in recent years, the need for large capacity and high speed elevators has been increasing. However, in order to achieve mass transportation using a single-cab elevator, the number of elevators installed in a high-rise building necessarily increases. For this reason, the proportion of the area occupied by the elevator on each floor tends to increase, and there may be a case where economic disadvantages occur in the operation of the building.

As a means for solving such disadvantages and realizing mass transportation and space saving at the same time, there is a double deck elevator in which two cabs are installed vertically inside a single car frame. In particular, a variable double-deck elevator has been put into practical use as a structure capable of coping with a structure in which all floor heights are not the same. A variable double-deck elevator is a double-deck elevator in which both cabs can be moved up and down within a car frame so that the upper and lower cabs match the floor level on any floor during operation. As a matter of fact, there are many buildings where all floor heights do not match, so the versatility of this method is high.

FIG. 6 shows an example of a conventional variable double deck elevator (disclosed in Japanese Patent Application Laid-Open No. 10-279231). Here, the car frame 1 is connected to the counterweight 7 via the main rope 4, and the electric motor 5 and the drive sheave 5a
Of the car frame 1 by the rotation of the main guide rails 7a, 7b
Guided to go up and down. Upper cab 2 and lower cab 3
Are the sub-guide rails 12a attached to the car frame 1,
It can move up and down inside the car frame according to 12b. In the double deck elevator shown here, a link mechanism 14 for moving the upper cab 2 and the lower cab 3 up and down in opposite directions is installed on the intermediate beam 1b. When moved up and down, the lower cab 3 is also moved up and down in the opposite direction by the link mechanism 14.

[0005]

In the above-mentioned conventional variable double-deck elevator, almost all of the weights of the upper and lower cabs and the total weight of the loading personnel act on the central portion of the intermediate beam via the link mechanism. Therefore, the intermediate beam must have sufficient strength to withstand it, and the weight of the car frame also increases. Accordingly, the weight of the entire system increases, and the required capacity of the electric motor also increases, resulting in a problem that manufacturing costs and running costs increase.

Further, since a large-scale link mechanism is disposed between the upper and lower cabs, there is no room for space, and maintenance work between the upper and lower cabs becomes difficult.

[0007] It is an object of the present invention to improve the maintenance workability by sufficiently securing the space between the upper and lower cabs while improving the maintenance workability by simultaneously improving the above-mentioned problems and realizing a lighter car frame.・ To provide a variable double-deck elevator with reduced total cost up to maintenance.

[0008]

To achieve the above object, the present invention provides a car frame which is guided by a main guide rail to move up and down, and an upper screw which is rotatably attached to the car frame and extends vertically. A shaft, a lower screw shaft rotatably mounted on the car frame and extending vertically, an upper cage having a nut portion engaging with the upper screw shaft, and a nut portion engaging with the lower screw shaft. And a drive motor attached to the car frame and rotating the upper screw shaft and the lower screw shaft, wherein the upper screw shaft and the lower screw shaft are simultaneously rotated by the drive motor. By doing
Provided is a double deck elevator configured to move the upper cab and the lower cab up and down in opposite directions.

[0009] The double deck elevator may further include a transmission mechanism for transmitting the driving force generated by the driving motor to the upper screw shaft and the lower screw shaft. In this case, the transmission mechanism includes: A first driven bulk gear provided at a lower end of the upper screw shaft, a second driven bulk gear provided at an upper end of the lower screw shaft, and a driving bulk driven by the driving motor; It is preferable to include a bulk gear set having a gear. According to such a configuration, the upper screw shaft and the lower screw shaft can be rotated in opposite directions by a simple mechanism.

The upper screw shaft and the lower screw shaft are
The car motor may be provided on each of the left and right sides of the car frame. In this case, the drive motors are provided corresponding to the left upper screw shaft and the lower screw shaft and the right upper screw shaft and the lower screw shaft, respectively. The motors are driven synchronously. Instead of providing drive motors corresponding to the left and right screw shafts, respectively, the drive-side bulk gears of both sets of bulk gears are connected by a shaft extending in the left-right direction, and this shaft is rotationally driven by one drive motor. It is also possible to configure so that

The double deck elevator may be further provided with sub-guide rails provided on both left and right sides of the car frame and extending vertically to guide the upper cab and the lower cab. In this case, the upper screw shaft and the lower screw shaft are provided on the left and right sides of the car frame, respectively, and the upper screw shaft and the lower screw shaft are separated from the corresponding sub guide rail in the front-rear direction. Can be provided at different positions.

From the standpoint of quietness, the engagement between the upper screw shaft and the nut of the upper cab, and the engagement between the lower screw shaft and the nut of the lower cab are ball screws. Preferably, a mechanism is formed.

Similarly, from the viewpoint of quietness, when a bulk gear set is provided, it is preferable to provide a soundproof cover that covers the set. In this case, it is preferable that the cover itself is formed of a damping steel plate, or a sound absorbing material or a damping steel plate is attached to the cover.

When a bulk gear set is provided, it is also preferable to form the bulk gear set as one unit and attach this unit to the car frame via an elastic body from the viewpoint of quietness and vibration isolation. It is.

Similarly, from the standpoint of quietness and vibration isolation, it is also preferable to attach the drive motor to the car frame via an elastic body.

[0016]

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

1 and 2, reference numeral 21 denotes a car frame, and an upper beam 21a of the car frame 21 is suspended by a rope (not shown). Vertical beam 21b of this car frame 21
Has a guide device 4 such as a guide shoe or a guide roller.
0 is provided, and the guide device 40 is engaged with the main guide rail 22 installed on the side wall of the hoistway. The car frame 21 is guided by a main guide rail 22 (see FIG. 2) and moves up and down in a hoistway (not shown).

The car frame 21 supports the upper car room 24 and the lower car room 25.
A sub guide rail 23 extending vertically (only the upper end and lower end thereof are shown in FIG. 1) is fixed to 1b. In the upper cab 24 and the lower cab 25,
Each of the guide devices 26 includes a guide shoe or a guide roller that engages with the sub guide rail 23. The upper car room 24 and the lower car room 25 can move up and down in the section inside the car frame 21 above and below the intermediate beam 21c, respectively.

Nuts 28a, 28a are provided at lower portions on both left and right sides of the upper cage 24 through elastic members 28c. An upper screw shaft 27a extending in the vertical direction is screwed to each nut portion 28a. Each upper screw shaft 2
The upper end of 7a is supported by a bearing 30 provided on a support frame 29 fixed to each of the left and right vertical beams 21b. On the other hand, a nut portion 28b is provided on the left and right upper portions of the lower cage 25 via an elastic body 28c. A lower screw shaft 27b extending in the vertical direction is screwed into each nut portion 28b. Each lower screw shaft 27
The lower end of b is supported by a bearing 30 provided on a support frame 29 fixed to each of the left and right vertical beams 21b.

The upper screw shaft 27a and the lower screw shaft 27
The central axis of b is located on the same vertical line. The upper and lower screw shafts 27a and 27b arranged on the left and right sides of the car cabs 24 and 25 in this manner are arranged at symmetric positions as shown in FIG. 2 when viewed from above.

As described above, the nuts 28a, 28a are connected to the upper and lower car cabs 24, 25 via the elastic body 28a.
By attaching 28b, it is possible to attenuate vertical vibrations when the upper and lower cabs 24, 25 move up and down, thereby improving ride comfort. Although the upper and lower screw shafts 27a and 27b are fixed to the vertical beam 21b via the support frame 29 and the bearing 30, an elastic body may be inserted at any point in this joining process. The same vibration reduction effect can be obtained.

The nut portions 28a and 28b and the upper and lower screw shafts 27a and 27b are engaged via balls, that is, the nut portions and the screw shafts constitute a ball screw mechanism. Is preferred. By doing so, quick and smooth operation of the cabs 24 and 25 becomes possible.

In the range between the upper cab 24 and the lower cab 25 (near the intermediate beam 21c), the car frame 2
The unitized reduction gear 31 is attached to one vertical beam 21 b via an elastic body 37. A range between the upper cab 24 and the lower cab 25 of the car frame 21;
In this example, a servo motor 34 is attached to the
It is mounted horizontally via 7a. Reducer 31
And the servo motor 34 are connected to the left screw shafts 27a, 27
b and the screw shafts 27a and 27b on the right side. The elastic body 37 and the elastic body 37a
This also contributes to vibration reduction as in the case of the elastic body 28a.

Next, with reference to FIG. 3, the structure of the speed reducer 31 and its connection with peripheral components will be described.

As shown in FIG. 3, the reduction gear 31 has a casing 31a. Inside the casing 31a, a pair of tapered roller bearings 32 and a pair of bulk gears 33a,
33b, a bulk gear 33 meshing with the bulk gears 33a, 33b
c has a fixed unit structure. Bulk gear 3
3a and 33b are larger in diameter than the bulk gear 33c.

The tapered roller bearings 32, 32 support the vicinity of the lower end of the upper screw shaft 27a and the vicinity of the upper end of the lower screw shaft 27b, respectively. In addition, the bulk gears 33a, 3
3b is a lower end of the upper screw shaft 27a and a lower screw shaft 27a.
b. On the other hand, the bulk gear 33c is attached to the tip of the output shaft 34a of the servomotor 34 oriented in the horizontal direction.

Therefore, by rotating the servo motor 34, the upper screw shaft 27a and the lower screw shaft 27b rotate in directions opposite to each other, and the upper car room 24 and the lower car room 25 are raised and lowered in opposite directions. be able to. The two servomotors 34 and 34 are controlled by a control device (not shown), and are driven in synchronization.

It is preferable to provide a cover 36 for covering the speed reducer 31 and the servo motor 34 as shown by a virtual line (dashed line) in FIG. By providing the cover 36, even when the speed reducer 31 is configured by a bulk gear that is considered to have relatively large operating noise, it is possible to make it difficult for noise generated therefrom to be transmitted to the upper and lower car cabs 24 and 25. Note that a sound absorbing material is attached to the inner surface of the cover 36, a damping steel plate is attached to the cover 36,
By forming the damper itself from the damping steel plate or by combining them, it is possible to more effectively take measures against noise.

According to this embodiment, the upper and lower cabs 24,
Since the screw shafts 27a and 27b supporting the total weight of 25 are supported by the vertical beams 21b of the car frame 21, the weight of the cab does not act on the intermediate beams 21c. For this reason, since the intermediate beam 21c can be greatly simplified as compared with the conventional system, the constituent members of the car frame 21 do not need to be unnecessarily large, and the weight of the entire double deck elevator system can be reduced.

A mechanism (servo motor 34, screw shafts 27a and 27b, nuts 28a and 2) for vertically moving the cabs 24 and 25 between the upper and lower cabs 24 and 25.
8b, reduction gears 31) are integrated at both left and right ends of the car frame,
Does not occupy space in the center of the car frame. At the same time, upper beam 21
Since there is no protruding mechanism at a, the top clearance can be sufficiently secured. From these points, there is an advantage that the maintenance and inspection workability is excellent.

In the embodiment shown in FIGS. 1 and 2, each of the left and right screw shafts 27a and 27b is
Although the servo motors 34 are provided one by one, the present invention is not limited to this, and the left and right screw shafts may be rotated by one servo motor 34 as shown in FIG.

In this case, as shown in FIG. 4, the bulk gears 33c of the left and right reduction gears 31 are connected to each other by a drive transmission shaft 34b extending in the left-right direction. Then, the drive transmission shaft 34b is rotationally driven by the servomotor 34. The transmission of the driving force from the servomotor 34 to the drive transmission shaft 34b can be performed using a transmission mechanism such as a gear or a chain.

FIG. 4 shows an output shaft 34 of the servomotor 34.
An example is shown in which a driving force is transmitted from the servo motor 34 to the drive transmission shaft 34b by a gear 34c provided on the drive transmission shaft 34b and a gear 34d provided on a drive transmission shaft 34b meshing with the gear 34c. In this case as well, the servomotor 34 is attached to an intermediate beam not shown in FIG.

With this configuration, since the left and right screw shafts can be rotated mechanically synchronously, the servo motor 34 can be rotated as in the embodiment shown in FIGS.
Unlike the case where a plurality of servo motors are provided, there is no need to synchronize the servo motors 34 by electrical control.

As shown in FIG. 5, the upper and lower screw shafts 27a and 27b may be arranged apart from the longitudinal beam 21b of the car frame 21 in the front-rear direction. The upper and lower cabs 24 and 25 include a sub-guide rail 23 and a screw shaft 27.
a, 27b restrict the front, rear, left and right directions. For this reason, the longer the distance between the sub guide rail 23 and the upper and lower screw shafts 27a, 27b is, the stronger the restraint in the front, rear, left and right directions of the cabs 24, 25 is, and the more stable the cabs 24, 25 are. There is an advantage that it can be achieved. In this case, the speed reducer 31 may be attached to the car frame 21 via a support arm 35 fixed to the vertical beam 21b as shown in FIG.

In the above embodiment, the upper screw shaft and the lower screw shaft are separate members. However, the present invention is not limited to this. The upper screw shaft and the lower screw shaft are configured as an integral member. Is also good. In this case, the upper cab and the lower cab can be moved in opposite directions by setting one of the upper and lower screws to a reverse screw.

[0037]

As described above, according to the double-deck elevator of the present invention, the size and weight of the car frame can be reduced, and the maintenance and inspection of the elevator can be easily performed.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a double deck elevator according to the present invention, and is a front view of a main part of a car frame and a cab.

FIG. 2 is a plan view of the car frame and the cab shown in FIG. 1,
FIG. 2 is a view taken along the line II-II in FIG. 1.

FIG. 3 is a partial cross-sectional view of a main part illustrating a configuration of a transmission mechanism and a coupling relationship between the transmission mechanism, a servomotor, and a screw shaft.

FIG. 4 is a front view of a main part showing another embodiment of the double deck elevator according to the present invention.

FIG. 5 is a plan view showing still another embodiment of the double deck elevator according to the present invention, viewed from the same direction as FIG. 2;

FIG. 6 is a front view of a conventional variable double deck elevator.

[Explanation of symbols]

 Reference Signs List 21 car frame 22 main guide rail 23 sub guide rail 24 upper car room 25 lower car room 27a upper screw shaft 27b lower screw shaft 28a nut portion 28b nut portion 33a first driven bulk gear 33b second driven bulk gear 33c Drive side bulk gear 34 Servo motor (drive motor) 36 Cover 37, 37a Elastic body

Claims (10)

[Claims] A car frame which is guided by a main guide rail and moves up and down; an upper screw shaft rotatably attached to the car frame and extending in a vertical direction; A lower screw shaft extending in a direction, an upper cab having a nut portion engaging with the upper screw shaft, a lower cab having a nut portion engaging with the lower screw shaft, and being attached to the car frame, A drive motor for rotating an upper screw shaft and the lower screw shaft, and rotating the upper screw shaft and the lower screw shaft simultaneously by the drive motor, thereby causing the upper car room and the lower car room to be in opposite directions. A double-deck elevator characterized by moving vertically. 2. A transmission mechanism for transmitting a driving force generated by the driving motor to the upper screw shaft and the lower screw shaft, wherein the transmission mechanism is provided at a lower end of the upper screw shaft. Driven bulk gear, a second driven bulk gear provided at the upper end of the lower screw shaft, and a bulk gear set having a drive bulk gear driven by the drive motor. The double-deck elevator according to claim 1, characterized in that: 3. The upper screw shaft and the lower screw shaft,
The drive motor is provided on each of the left and right sides of the car frame, and the drive motors are provided corresponding to the left upper screw shaft and the lower screw shaft and the right upper screw shaft and the lower screw shaft, respectively. The double-deck elevator according to claim 1 or 2, characterized in that the double-deck elevators are driven synchronously. 4. The upper screw shaft, the lower screw shaft, and the bulk gear set are respectively provided on left and right sides of the car frame, and the drive-side bulk gears of both the bulk gear sets extend in the left-right direction. Are connected by a shaft, and the shaft is rotationally driven by one drive motor.
The double deck elevator according to claim 2. 5. A sub-guide rail, which is provided on both left and right sides of the car frame and extends vertically, and guides the upper car room and the lower car room, wherein the upper screw shaft and the lower screw shaft include: 2. The double deck elevator according to claim 1, wherein the double deck elevator is provided on each of the left and right sides of the car frame, and is provided at a position distant from the corresponding sub guide rail in the front-rear direction. 6. An engagement portion between the upper screw shaft and a nut portion of the upper cab, and an engagement portion between the lower screw shaft and a nut portion of the lower cab form a ball screw mechanism. The double-deck elevator according to any one of claims 1 to 5, wherein: 7. The double deck elevator according to claim 2, further comprising a soundproof cover that covers the bulk gear set. 8. The double deck elevator according to claim 7, wherein the cover itself is formed of a damping steel plate, or a sound absorbing material or a damping steel plate is attached to the cover. 9. The double deck elevator according to claim 2, wherein the bulk gear set is configured as one unit, and the unit is attached to the car frame via an elastic body. . 10. The double deck elevator according to claim 1, wherein the drive motor is mounted on a car frame via an elastic body.