JPS647955B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to the traction structure of an elevator, and in particular, the present invention relates to a traction structure of an elevator, and in particular, a flexible high-friction material (insert ring) inserted into a hoisting machine sheave groove. This invention relates to a traction sheave that can safely compensate for elevator operation even if it is damaged.

(Prior Art) In recent years, in undercut type traction sheaves, parts have been replaced in a relatively short period of time due to sheave wear and rope wear.

This imposes a large burden on human resources such as maintenance and inspection costs and replacement of parts with new parts. In addition, it was technically impossible to maintain constant performance due to aging. In addition, the metal sheave and metal rope generate some vibration noise, which has an adverse effect on the ride comfort and the building.

In order to solve these problems, a sheave in which a flexible high-friction material such as rubber or synthetic resin is attached to the groove of the traction sheave body has recently been developed and put into practical use. This guarantees the traction (driving force) of the conventional type, reduces vibration and noise, and the sheave has less wear on the rope, extending its life and improving performance.

(Problems to be Solved by the Invention) In the case where a rubber material is vulcanized in the groove of the sheave body, there is a problem in the fatigue life of the vulcanized rubber material. In other words, it is conceivable that the traction sheave cross-linked with a high-friction rubber material is missing due to fatigue life. Alternatively, there may be variations in the cross-linked rubber material itself, or damage due to high loads, etc. If the cross-linked rubber material is missing, the traction sheave will not be able to maintain traction (driving force) with the rope, making it impossible to control the speed of the elevator. It is something to do.

This is just like an elevator without a brake, and this phenomenon obviously results in an overspeed phenomenon and activates safety devices such as the governor, which are prepared for failure. It is not recommended to use it as a way of thinking about predictable transient phenomena.

It is against our will to use the worst possible means to ensure safety, and it is essential that the sheave itself at least meet the worst possible conditions.

Based on this idea, the present invention is an elevator traction system that is capable of ensuring traction (driving force) for the elevator load at all times even if a high-friction material such as rubber or synthetic resin is missing from the sheave body. The purpose is to provide a new sieve.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a traction machine installed in a machine room, an output shaft provided in the traction machine,
A sheave body pivotally mounted on the output shaft, a deflection sheave that holds the space between the car and the counterweight, a rope wound around the traction sheave and the deflection sheave, and a car and a car provided at one end of the rope. A counterweight provided at the other end, a V-shaped groove formed on the outer peripheral surface of the sheave body, and a V-shaped groove of the same shape provided on the side of the V-shaped groove provided so as to cover the entire circumference of the V-shaped groove.
A high-friction material is formed to form a V-shaped groove and a groove for accommodating a rope is formed on the opposite outer diameter side, and when the high-friction material is removed from the sheave body, the rope comes into contact with the inclined part of the V-shaped groove. The present invention forms a traction sheave for an elevator, which is characterized by having a predetermined gap from the bottom of the groove.

(Function) The present invention forms a V-shape of approximately the same shape on the V-shaped groove side within the entire circumference of the V-shaped sheave groove, and stores a rope on the opposite external side. Attach a high-friction material with grooves for

The above-mentioned engagement between the V-shaped sheave groove and the V-shaped high-friction material is achieved by a small force from the rope side acting on the V-shaped sheave groove slope, which causes the high-friction material and the sheave groove to remain stationary. Increases frictional force and maintains a stable state.

Then, the rope is wound around the sheave body through the high friction material, and a car and a counterweight are attached to the end of the rope, and the rope is raised and lowered by the traction between the high friction material and the rope. During this operation process, even if the high-friction material were to come off due to damage or other reasons, the rope would come into direct contact with the V-shaped sheave groove, and the traction necessary for safe driving would be achieved without the rope hitting the bottom of the sheave. It's something you get.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 shows a schematic diagram of an elevator showing an embodiment of the present invention. An output shaft 2 is pivotally connected to the traction machine 1, and a traction sheave body 3 is attached to the output shaft 2.
is integrally attached and rotatable, a deflection sheave 5 is attached to the machine bed 4, a rope 6 is wound around it, and a car 7 is attached to both ends of the deflection sheave 5.
A counterweight 8 is connected to the car 7, and the car 7 is moved up and down by the driving force of the traction machine 1. Further, an elastic body 10 is provided between the floor 9 of the machine room and the machine bed 4.

In other words, the present invention applies to a traction machine 1 installed in a machine room as shown in FIGS. 1 to 3.
and an output shaft 2 provided in the traction machine 1.
, a sheave main body 3 pivotally connected to the output shaft 2, a deflection sheave 5 that holds the space between the car 7 and the counterweight 8, and a rope 6 wound around the traction sheave 3 and the deflection sheave 5. The rope 6
A car 7 provided at one end, a counterweight 8 provided at the other end, a V-shaped groove of α° formed on the outer peripheral surface of the sheave body 3, and a V-shaped groove provided so as to cover the entire circumference of the sheave body 3. A high-friction material 13 is formed on the V-shaped groove side to form a V-shape of the same shape, and a groove portion for accommodating the rope 6 is formed on the opposite outer diameter side, and when the high-friction material 13 is missing from the sheave body. This is a traction sheave for an elevator, characterized in that the rope 6 is in contact with the inclined portion of the V-shaped groove α° and has a predetermined gap from the groove bottom.

To further describe the present invention in detail, a plurality of V-shaped α° sheave grooves are provided on the outer peripheral surface of the sheave body 3 which is pivotally connected to the output shaft 2 of the traction machine 1, and a V-shaped sheave groove that matches the shape of the sheave groove. A high friction material 13 having a rope accommodating groove provided on the outer diameter side of the letter shape and the opposite side thereof,
Fitted into the V-shaped sheave groove, the high friction material 13 obtains a static friction force by a wedge action on the sheave groove due to the load action of the rope 6, and the high friction material 13
Even if the high friction material 13 is missing due to fatigue or other causes, the traction of the α° V-shaped groove of the sheave groove reliably prevents the car 7, etc. from being suspended.

That is, the V-shaped sheave groove of the sheave body 3 and the
Since the letter-shaped high-friction materials 13 are not bonded to each other, it is particularly necessary that there is a sense of geometrical unity between the two, and it is difficult to realize the present invention without this relationship.

In the above mechanism, when the load of the rope 6 is applied, the relationship between the frictional forces is F1<F2, where F1 is the frictional force between the rope 6 and the high-friction material 13, and F2 is the frictional force between the high-frictional material 13 and the sheave groove.

Furthermore, when the high friction material 13 is missing, the rope 6
If the frictional force between the and the V-shaped sheave groove is F3, then F
The present invention is realized by ensuring the relationship 1≦F3.

Therefore, in the present invention, the shape (particularly the angle) corresponding to the sheave groove surface of the high friction material 13 covering substantially the entire surface of the sheave groove has a static friction force that does not cause slippage in the sheave groove during normal (normal) operation. To obtain approximately isomorphic V
If safety is guaranteed by securing the shape of the rope so that it meshes with the rope in the event of a breakage, it will not function as an elevator traction sheave.

By the way, as described above, the above-mentioned frictional force F2 is achieved by fitting the V-shaped high friction material 13 into the V-shaped sheave groove. The reason for this is that when the rope 6 comes in contact with the rope groove of the high friction material 13, a load is applied, and the high friction material that is not bonded is pushed into the V-shaped groove of the sheave groove, and due to the wedge mechanism, the slope of the sheave groove is multiplied. One of the features of the present invention is that it acts as a force component tens of times larger, obtains a high frictional force, and obtains a stable structure and function without adhesion or the like.

FIG. 2 is a partial cross-sectional view of the traction sheave body 3 shown in FIG. 1, and the sheave grooves 11 form V-shaped grooves with an angle of α°, and U-shaped grooves 12 are provided in the lower portions of the grooves.

On the other hand, assuming that the high friction material 13 such as a cross-linked rubber material formed in an endless shape is formed in a substantially V shape, the spaces a, b of the lower engaging portion,
c, a'b', and c', and in this part, the high friction material 13 actually undergoes volumetric strain due to the downward force of the wire rope 6, and occupies that space. This occurs only on the side where the traction sheave body 3 receives the load, and generally this space and the elasticity of the high-friction material 13 buffer the vibrations when driving the wire rope, improving the riding comfort of the car 7. have an effect.

In such a structure, if the high friction material 13 is cut or damaged for some reason and is partially or completely missing, as shown in FIG.
The wire rope 6 comes into contact with the traction sheave groove 11 at the contact portion 14, and a frictional force is obtained at this portion. Although Fig. 3 shows a case where the U-shaped groove 12 is provided at the lower part of the V-shaped groove, the same effect can be obtained even if the traction sheave groove 11 is shaped at α° and the V-shaped groove obtains traction according to the load. .

In other words, when the high-friction material 13 is engaged normally, the driving force (traction) obtained from its frictional force is different, but if it breaks and comes into direct contact with the V-shaped groove, the frictional force will be reduced. The driving force (traction) obtained from the load (traction ratio)
A V-shaped groove with an angle corresponding to the angle is used.

Therefore, at least the driving force (traction) that guarantees safety when the rope 6 comes into contact with the V-shaped groove immediately after the high-friction material 13 is missing is set to be approximately the same or higher.

Although FIG. 3 shows a diagram in which two of the four grooves are damaged, it is of course possible that all grooves will be damaged.

〔Effect of the invention〕

As described above, according to the present invention, even in the worst case, the friction in the contact portion 14 makes it easy to safely accelerate and decelerate the elevator even if the car or the counterweight is unbalanced in terms of load. It's controllable and there's no chance of it slipping off the heavier side.

As a result, safe operation can be achieved even if the elevator encounters a fire or the like during operation, or is damaged due to fatigue failure of a high friction material such as a bridge rubber material.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an elevator using the present invention;
FIG. 2 is a cross-sectional view taken along the arrow in FIG. 1, and FIG. 3 is a diagram showing a traction sheave according to the present invention in which the high-friction material is missing. 3...sheave body, 6...rope, 7...cart,
11...Groove, 12...U-shaped groove, 13...High friction material.

Claims (1)

[Claims] 1 Traction machine installed in the machine room,
An output shaft provided on the traction machine, a sheave body pivotally connected to the output shaft, a deflection sheave that holds a space between the car and the counterweight, and a rope wound around the traction sheave and the deflection sheave. , a car provided at one end of the rope, a counterweight provided at the other end, a V-shaped groove formed on the outer peripheral surface of the sheave body, and the V-shaped groove provided so as to cover the entire circumference of the V-shaped groove. A high-friction material is formed with a V-shape of the same shape on the side of the groove and a groove for accommodating the rope is formed on the opposite outer diameter side, and when the high-friction material is missing from the sheave body, the rope is A traction sheave for an elevator, characterized in that the traction sheave is in contact with an inclined part of a letter-shaped groove and has a predetermined gap from the bottom of the groove.