JP2004026420A - Safety device of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device of an elevator, which makes auxiliary brake device having been used unnecessary, is simple structured, is of low cost and can shorten the stopping distance of the elevator when the elevator stops in an emergency. <P>SOLUTION: The safety device of the elevator is provided with the sheave 1 of a rope type elevator, a deflector wheel 2, and a ring-shaped connecting member 3 for interlocking the sheave 1 and the deflector wheel 3. The deflector wheel 3 has a groove 5 at a portion, where the rope of the deflector wheel 3 is roped and is provided with a member to boost the brake force in a emergency in this groove. This member uses friction material 6 of high coefficient of friction. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an elevator safety device, and more particularly to an elevator safety device that takes into account a reduction in the stopping distance of an elevator during an emergency stop.
[0002]
[Prior art]
In general, the holding brake force of a brake device installed in an elevator drive device is designed to maintain a sufficient holding force against the loaded load in the car even if the friction coefficient of the friction material fluctuates due to environmental factors or the like. It is set with an allowance for the loading load. The elevator brakes the rotation of the sheave by a braking device in an emergency, and stops. Usually, the braking force generated at the time of emergency braking is substantially equal to the holding brake force set as described above.
[0003]
In particular, in an elevator using a driving device without a reduction gear, the inertia of the driving device itself is smaller than that of a car or a counterweight, so that the braking force becomes excessive with respect to the total inertia of the elevator, and the sheave is used in an emergency stop. It becomes locked and the rope tends to slip on the sheave. As a result, there is a problem that the stopping distance is increased as compared with an elevator using a drive device having a speed reducer.
[0004]
For example, an elevator safety device disclosed in Japanese Patent Application Laid-Open No. 4-129988 is for obtaining a brake holding force capable of withstanding a load exceeding a load such as a forklift in a luggage elevator or the like.
[0005]
[Problems to be solved by the invention]
However, in the case of the conventional device as described above, it is necessary to use an auxiliary brake device in addition to the existing brake device, and there has been a problem that the configuration is complicated.
Further, for example, a conventional elevator safety device disclosed in JP-A-2000-110868 and JP-A-2001-146366 has a function of delaying a brake device or a circuit configuration of a brake. However, also in this case, there is a problem that the brake device and the control device are complicated.
[0006]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an elevator safety device capable of simplifying the configuration and shortening the stop distance of the elevator during an emergency stop. I do.
[0007]
[Means for Solving the Problems]
An elevator safety device according to the present invention includes a sheave of a rope type elevator, a deflecting wheel, and an annular connecting member that interlocks the sheave and the deflecting wheel.
[0008]
Further, in the elevator safety device according to the present invention, in the deflector wheel, a member for increasing a braking force at the time of an emergency stop is provided in a groove in a portion where the rope is hung.
[0009]
In the elevator safety device according to the present invention, as the member for increasing the braking force, a friction material having a higher friction coefficient than the material of the deflector wheel itself is used.
[0010]
Also, in the elevator safety device according to the present invention, the deflector wheel has the same groove shape as that of the sheave in the portion where the rope hangs.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing an elevator safety device according to Embodiment 1 of the present invention.
In FIG. 1, 1 is a sheave, 2 is a deflecting wheel, 3 is a connecting member, 4 is a rope, 5 is a groove, 6 is a friction material, and 7 is a drive device.
Here, as shown in FIG. 1, an annular connecting member 3 that is hooked on the sheave 1 and the deflecting wheel 2 of the driving device 7 is provided. A groove 5 on which the rope 4 of the deflecting wheel 2 is hooked is provided with a friction material 6 having a high friction coefficient, for example, a rubber material such as urethane rubber.
[0012]
According to this structure, when the rotation of the sheave 1 is braked by the emergency braking, the deflecting sheave 2 is connected to the sheave 1 by the annular connecting member 3, and thus the sheave 2 is interlocked with the sheave 1. The rotation of the deflecting wheel 2 is also braked.
[0013]
When the inertia of the drive device 7 itself is small, the rope 4 tries to slide on the sheave 1 and the deflecting wheel 2, but since the winding angle of the rope 4 on the deflecting wheel 2 is smaller than that of the sheave 1, With ordinary materials, the braking force generated by the deflecting wheel 2 itself is small, and the braking distance is not so short.
[0014]
However, in FIG. 1, since the friction material 6 having a high friction coefficient is used for the groove 5 of the rope 4 of the deflecting wheel 2, even at a small winding angle, the braking force is larger than the braking force of only the sheave and the deflecting wheel. Power can be obtained, that is, the braking force can be given without being largely influenced by the driving ability (= determined by the winding angle and the shape of the groove) of the sheave, and the stopping distance of the elevator can be shortened. Becomes possible.
[0015]
In this manner, in the present embodiment, by providing a friction material having a high friction coefficient in the groove where the rope of the deflecting wheel is hung, it becomes unnecessary to use an auxiliary brake device or the like in addition to the originally existing brake device, It is not necessary to provide a circuit configuration having a special function such as a function for delaying the brake device or the circuit configuration of the brake, so that the configuration becomes simpler, the cost is reduced, and the emergency stop is performed. Sometimes a desired braking force can be reliably obtained, and the stopping distance of the elevator can be shortened.
[0016]
Embodiment 2 FIG.
In the first embodiment, the friction material 6 having a high friction coefficient is provided in the groove 5 where the rope 4 of the deflecting wheel 2 is hung. However, instead of the friction material 6, the shape of the groove 5 of the deflecting wheel 2 itself is used. The shape of the groove 5 at the portion where the rope 4 of the deflecting wheel 2 is hung may be the same as the groove of the sheave 1.
Normally, the sheave 1 is provided with an undercut at the bottom of a round groove so that the rope 4 can bite or transmit the driving force of the driving device 7 to the rope 4 or use the groove as a V-shaped groove having a high driving capability. I do. On the other hand, since the deflecting wheel 2 only deflects the rope 4, a round groove having a not so large driving capability is used. Therefore, as described above, the following effects can be obtained by making the shape of the groove 5 in the portion of the deflecting wheel 2 where the rope is hooked the same as the groove of the sheave 1.
[0017]
During an emergency stop, the sheave 1 is braked by a brake device provided on the hoisting machine main body. As described above, in the case where the safety device includes the sheave 1 of the rope type elevator, the deflecting sheave 2, and the annular connecting member 3 that interlocks the sheave 1 and the deflecting sheave 2, the deflecting device is interlocked with the sheave 1. The car 2 is also braked. Therefore, in the present embodiment, since the same groove shape (high driving capability = high braking capability) as that of the sheave 1 is provided in the deflecting wheel 2, the deflecting wheel 2 that is braked in conjunction with the sheave 1 is provided. The braking force generated is increased, and the overall braking force can be made larger than when simply linking the round groove deflecting wheels.Furthermore, since a friction material having a high friction coefficient is not required, the cost is reduced. Will also be cheaper.
[0018]
【The invention's effect】
As described above, according to the present invention, the rope type elevator sheave, the deflecting wheel, and the annular connecting member for interlocking the sheave and the deflecting wheel are provided. There is no need for a brake device or the like, so that the configuration can be simplified accordingly, the cost can be reduced, and the stopping distance of the elevator during an emergency stop can be shortened.
[0019]
Further, according to the present invention, since the deflecting wheel is provided with a member for increasing the braking force at the time of emergency stop in the groove where the rope is hung, the braking force is larger than the braking force of only the sheave and the deflecting wheel. There is an effect that power can be obtained, which can contribute to shortening of the stopping distance of the elevator at the time of emergency stop.
[0020]
Further, according to the present invention, as the member for increasing the braking force, a friction material having a higher friction coefficient than the material of the deflecting wheel itself is used, so that the stopping distance of the elevator during an emergency stop can be reliably reduced. Has the effect of contributing to
[0021]
Further, according to the present invention, since the deflecting wheel has the same groove shape as the groove of the sheave, the shape of the groove where the rope hangs is the same as that of the sheave (high driving ability = braking ability (High) groove is substantially provided on the deflecting wheel, and the braking force generated by the deflecting wheel, which is braked in conjunction with the sheave, is increased, and the overall braking force is simply a round groove deflecting wheel. Can be made larger than when they are linked, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an elevator safety device according to Embodiment 1 of the present invention.
[Explanation of symbols]
1 sheave, 2 deflector, 3 connecting member, 4 rope, 5 groove, 6
Friction material, 7 drive.

Claims (4)

A rope type elevator sheave,
With a deflector car,
An elevator safety device comprising: the sheave and an annular connecting member interlocking the deflecting wheel. 2. The safety device for an elevator according to claim 1, wherein the deflecting wheel is provided with a member that increases a braking force at an emergency stop in the groove where the rope is hung. 3. The elevator safety device according to claim 2, wherein a friction material having a higher friction coefficient than a material of the deflecting wheel itself is used as the member for increasing the braking force. 2. The elevator safety device according to claim 1, wherein the deflecting wheel has the same groove shape as the groove of the sheave in a portion where the rope is hung.

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