JP2004161468A - Rope-less elevator apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device of a rope-less elevator apparatus which does not require any special drive source. <P>SOLUTION: In this elevator, an elevator car moves along a guide rail in a hoistway with a thrust by the driving of a linear motor formed of a primary coil and a secondary conductor. Arms pressing the base surface of the guide rail are rotatably fitted to the elevator car, ball screws are press-fitted to the arms, and a moving table with a permanent magnet is mounted on the ball screws. The arms are formed in pairs oppositely to each other, and the ball screws in which grooves are cut in different directions are mounted on the arms. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a low-press elevator apparatus that does not use a rope.
[0002]
[Prior art]
In recent years, a low-press linear motor elevator device that raises and lowers an elevator car by driving a linear motor has been proposed instead of a traction-type elevator that raises and lowers the elevator car by hoisting drive using a rope. (For example, see Patent Document 1)
[0003]
[Patent Document 1]
JP 2001-294381 A
That is, as shown in FIG. 2, the primary coil 4 and the secondary conductor 5 of the linear motor 3 are connected to the left and right side surfaces of the elevator car 1 and the left and right inner wall surfaces of the hoistway 2 with a gap therebetween. The elevator car 1 travels along the guide rail 6 in the hoistway 2 by the thrust generated between the primary coil 4 and the secondary conductor 5 of the linear motor 3. Reference numeral 7 denotes a guide roller provided on the elevator car 1, which runs on the guide rail 6.
[0005]
Such a low-press elevator does not use a hoist or main rope, so there is no limit to the lifting process, so it is optimal for a skyscraper and the advantage that multiple elevator cars 1 can be installed in one hoistway. There is.
[0006]
[Problems to be solved by the invention]
However, since there are no ropes, safety devices that do not allow the elevator car to fall in the event of a power outage or failure are indispensable.Various proposals have been made so far, but practically satisfactory devices have not yet been developed. Is the current situation.
[0007]
The present invention has been made in view of the above points, and has as its object to provide an optimal safety device for a low-press elevator.
[0008]
[Means for Solving the Problems]
The present invention relates to an elevator in which an elevator car moves along a guide rail in a hoistway by a thrust generated by a linear motor composed of a primary coil and a secondary conductor.In the elevator car, an arm that presses the base surface of the guide rail is rotated. The ball screw is press-fitted into the arm, and the ball screw is provided with a movable base having a permanent magnet.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the present invention, a safety device is configured using a linear motor as a driving source.
[0010]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of an essential part of an elevator car provided with a safety device according to the present invention, FIG. 3 is an enlarged view of a part P in FIG. 1, FIG. 4 is a view taken along the line AA in FIG. 3, and FIG. It is an explanatory view showing a basic principle concerning the present invention.
[0011]
2, the same reference numerals as those in FIG. 2 denote the same components, but reference numeral 10 denotes an L-shaped bracket provided on the elevator car 1, and reference numerals 11 and 12 denote roots of the guide rails 6 (that is, guide rollers contact with each other). A tension spring 13 is provided between the other end and the bracket 10 with an arm having brake pads 11a, 12a at one end facing the rough surface (not rough). The tension spring 13 constantly urges the arms 11 and 12 in a direction in which the interval between the other ends of the arms 11 and 12 increases (a direction in which the surface facing the guide rail 6 approaches).
[0012]
Then, ball screws 14 and 15 are press-fitted at the central portions of the arms 11 and 12, and the ball screws 14 and 15 are rotatably mounted on the bracket 10, and are threaded in opposite directions. Reference numeral 16 denotes a moving table which is fitted to the ball screws 14 and 15 and moves along the screw groove, and is provided so as to project outward. The movable table 16 is provided with a permanent magnet 17 so as to face the primary coil 4 of the inner wall of the hoistway.
[0013]
The operation of the arms 11 and 12 will be described next.
The electrical positional relationship between the voltage (E _S <E _r ) of the primary coil 4 and the permanent magnets 5 and 17 is as shown in FIG. 5B. When the primary voltage is _Er , the permanent magnet 17 Go to the same position as the permanent magnet 5, opens the brake pads 11a, 11b as described later, whereas when the primary voltage is E _S is the permanent magnet 17 returns to the home position, so that the braking.
[0014]
That is, if the primary voltage level rises from Es to Er prior to the operation of the elevator car, as shown in FIG. 3, the permanent magnet 17 moves upward by the electromagnetic force, and the moving table 16 also moves upward. 4, the ball screw 14 rotates to the left and the ball screw 15 rotates to the right, so that the arm 11 rotates to the left and the arm 12 rotates to the right. . In this state, the elevator car 1 can be electrically stopped and stopped.
[0015]
On the other hand, when the elevator car 1 stops on the landing floor and the primary voltage level decreases from Er to Es, the arms 11 and 12 cause the brake pads 11 a and 12 a to clamp the guide rail 6 by the spring force of the extension spring 13. , And the elevator car 1 is mechanically stopped. This leads to the same operation of the brake in the event of a power failure, and mechanically stopping the elevator car 1.
[0016]
Here, the following conditions are required for this device.
In FIG. 5 (a), the pressing force F _f of the _brake, the live load including the weight of the car is W, the brake pads゛No friction coefficient mu, the return torque of the permanent magnet 17 and T _BPM,
Wg ≦ 2 * F _f * μ
Braking torque _{M B} is _{M B = F f * l 1} = F S * l 2- T BPM
_{F f = (F S * l} 2 -T BPM) / l 1
When T _BPM = 0,
_{Wg ≦ (2 * F S *} l 2 * μ) / l 1
F _S ≧ Wg * (1 / 2μ) * (l ₁ / l ₂ )
The spring pressure of the tension spring 13 can be obtained from the following equation. If this condition is satisfied, the elevator car 1 can be mechanically stopped even during a power failure.
[0017]
【The invention's effect】
As described above, according to the present invention, since the brake can be applied and released using the linear motor that applies the propulsive force to the elevator car, it is possible to obtain a safety device having a small number of parts and an extremely simple configuration. Further, the primary voltage E during the elevator run in the range of E _r> E> E _s, is controlled as necessary, the brake pads will be in contact with the gently guide rails, vibrations when the elevator car traveling Can be alleviated by frictional force.
[Brief description of the drawings]
FIG. 1 is an overall view of a main part showing an elevator car provided with a safety device according to the present invention.
FIG. 2 is an overall perspective view of a low-press linear motor elevator.
FIG. 3 is an enlarged view of a part P in FIG. 1;
FIG. 4 is a view taken along line AA of FIG. 3; FIG. 5 is an explanatory view showing a basic principle according to the present invention;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Elevator car 3 Linear motor 4 Primary coil 5 of linear motor 3 Secondary conductor 6 of linear motor 3 Guide rail 11, 12 Arm 13 Extension spring 14, 15 Ball screw

Claims (3)

In an elevator in which an elevator car moves along a guide rail in a hoistway by a thrust by a linear motor drive composed of a primary coil and a secondary conductor,
The elevator car is provided with a rotatable arm for pressing a base surface of the guide rail, a ball screw is press-fitted into the arm, and the ball screw is provided with a movable base having a permanent magnet. Low-press elevator equipment. The low-press elevator apparatus according to claim 1, wherein a pair of the arms are provided so as to face each other, and each arm is provided with a ball screw having a groove cut in a reverse direction. 3. The low-press elevator apparatus according to claim 2, wherein the pair of arms includes a biasing device that biases a surface facing the guide rail in a direction to always approach the guide rail. 4.

Images