JPS5830876B2 - elevator equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a groove shape for delivery of a traction machine.

As is well known, many modern elevators employ traction type machines that rely on the frictional force between a delivery car and a hoisting rope to drive and brake the car.

On the other hand, increasing the speed of temporary elevators and reducing the diameter of sheaves to increase machine efficiency are issues that must be met to meet customer needs.

However, the above-mentioned traction type machines sometimes tend to be unable to obtain sufficient frictional force between the sheave and the hoisting rope during emergency braking in the event of an overload. This was a major obstacle during production.

For this reason, conventionally, in order to increase the frictional force between the sheave and the hoisting rope, the groove shape of the sheave has been made into a shape that can obtain a large frictional force, such as an undercut groove. When used in a full-wrap type traction machine, it shortened the life of the sheave and hoisting rope, especially the hoisting rope.

In other words, in a full-length traction machine, one hoisting rope is wrapped twice around the sheave and deflection wheel, so when it is hooked for the second time, it is wrapped around the sheave and deflection wheel twice. The rope will be wound with a difference of one pitch between the rope grooves.

In other words, as long as the axes of the sheave and deflection wheel are parallel, the rope has no choice but to tilt with respect to the rope groove.

Conventionally, in order to make this angle of inclination (hereinafter referred to as the fleet angle) as small as possible, sheaves and deflecting wheels were arranged as shown in Figure 4.

The one in Fig. 4 is constructed by shifting the rope grooves of the sheave 2 and the deflection wheel 3 by half a pitch.
The fleet angles of the rope 4 passing from the deflection sheave 3 to the sheave, and conversely the fleet angles passing from the deflection sheave 3 to the sheave (there are three in total) are arranged so that they are equal (at this time, the fleet angle is set to α degrees).

In other configurations, one of the three fleet angles is α
It will go too far.

It is generally known that when a rope with such a fleet angle enters a sheave, a rotational torque is applied to the rope from the sheave groove in a direction that reduces the fleet angle.

In particular, in a sheave wheel having a groove shape that increases the frictional force described above, if the lobes are now given rotational torque in the direction of twisting, the frictional force in the direction of untwisting will also become a dog, and the grooves with a small friction coefficient ( For example, in the case of round grooves), it was confirmed through experiments that the twists that were easily untwisted on the sheave were no longer untwisted.

This rotational torque is applied to the rope every time the elevator goes up and down, causing torsional fatigue in the lobe and shortening the life of the rope.

The present invention aims to overcome the above-mentioned drawbacks and to provide an elevator system capable of obtaining sufficient frictional force between the delivery vehicle and the hoisting lobe, and at the same time extending the service life of the lobe.

An embodiment of the present invention shown in FIGS. 1 to 3 will be described below.

In the figure, 1 is an electric motor, 2 is a sheave whose shaft is driven by the electric motor 1, 3 is a deflection wheel, 4 is a hoisting rope that is wound twice around the sheave 2 and the deflection wheel 3, and 5 is a winding rope. A car attached to one end of the upper rope 4 and raised and lowered; 6 a counterweight attached to the other end of the hoisting rope 4 and raised and lowered in the opposite direction to the heel 5; 7° 8 the outer periphery of the sheave 2; The first
and a second groove, the first groove 1 is an undercut groove so that the frictional force between it and the rope 4 is small, and the second groove 8 adjacent thereto is made smaller than the first groove 7. The round groove has a small frictional force and allows the loaf 4 to rotate freely within the groove.

Note that the grooves provided on the outer periphery of the deflection wheel 3 may also be grooves 7 and 8 having the same shape as that of the sheave 2.

Since this invention is constructed as described above, when the sheave 2 and deflection wheel 3 are arranged as shown in FIG.
The lobe 4 that enters has no fleet angle at all.

Therefore, no matter how much the coefficient of friction of the first groove 7 with respect to the rope 4 is increased, no rotational torque is applied to the lobe 4.

On the other hand, the rope 4 entering the second groove 8 has a fleet angle of twice α degrees, but the second groove 8 is manufactured so that the mouth to the rope 4 can rotate freely within the groove. Even if rotational torque is generated, the rope will not become twisted.

Therefore, the lobes do not suffer from torsional fatigue, and the life of the ropes can be greatly extended.

Furthermore, the fleet angle of the lobe 4 entering the first groove 7 is O
Therefore, it is possible to adopt a groove shape that can obtain a higher frictional force than before, and the second groove 8 can compensate for the slightly lower frictional force than before, increasing the overall traction. It is possible to secure the same level of ability as before.

[Brief explanation of drawings]

Fig. 1 is a perspective view conceptually showing an elevator system, Fig. 2 is a plan view of essential parts showing an embodiment of the elevator system of this invention, and Fig. 3 is an enlarged view showing the rope groove of the sheave of Fig. 2. FIG. 4 is a diagram corresponding to FIG. 2 showing an example of a conventional elevator system. Note that the same reference numerals in the figures indicate the same or corresponding parts. In the diagram, 1... electric motor, 2... sheave, 3
...Deflection wheel, 4...Hoisting rope, 5
...basket, 6...counterweight, 7...
...First groove, 8...Second groove.

Claims (1)

[Claims] 1. A traction machine consisting of an electric motor and a sheave driven by the electric motor, a traction rope that is wound around the sheave and has a car on the negative side and a counterweight on the other side so that they can be raised and lowered, respectively; In an elevator of the type, a deflection wheel is provided to maintain the car and the counterweight at appropriate intervals, and the rope is wound around the sheave twice and the deflection wheel twice each. Of the two rope grooves formed on the car, the first rope groove where the foot angle is 0 is shaped to have a large frictional force, and the second rope on the side into which the rope with the foot angle enters. An elevator system characterized in that the groove has a shape that has lower friction than the first rope groove and allows the rope to rotate within the groove.