JPH0130758B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to improve the traction of a traction sheave used in an elevator traction machine, and to prevent the groove-inserted polyurethane rubber ring used in the traction sheave from being damaged or missing by any chance.
To provide a sheave for an elevator that can safely and reliably obtain traction without activating other safety devices even if the sheave becomes a bare metal sheave.

Conventionally, polyurethane rubber or the like is inserted into the traction sheave groove, but the groove shape is a round groove or a round U groove. Recently, a V-shaped one has already been proposed by the applicant.

However, a high-friction buffer such as a polyurethane rubber ring usually has a large amount of traction, so if it were to fall off, the cabana could trip due to overspeed due to lack of traction.
This is not desirable as the emergency stop device etc. will be activated.

SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator sheave that can safely maintain operation by its own traction in such unexpected situations without relying on the operation of the safety device or the like. below,
The explanation will be based on the illustrated embodiment.

FIG. 1 shows a schematic diagram of an elevator using the present invention. In the figure, a traction sheave 2 is attached to the output shaft of a traction machine 1, and a deflection sheave 3 is installed nearby, a main wire rope 4 is wrapped around these, and the main wire rope 4 is lowered into the hoistway.
A car 5 and a counterweight 6 are pivotally attached to both ends,
A control device (not shown) provided in the machine room 7 controls the traction machine to move the elevator car up and down.

The main wire rope 4 and the traction sheave 2 must always have traction and braking force against any unbalanced load. For this purpose, as shown in FIG. 2, a plurality of sheave grooves 8 are provided in the traction sheave 2, and a buffer member 9 such as a polyurethane rubber ring is further provided therein as a high friction member.

This traction sheave groove 8 is formed in a V-shape, and is formed at a two-step angle with an inlet side groove angle α and a groove bottom side groove angle β, and the above two V-shaped groove angles are α>β (however, β≠ 0). The buffer body 9 that engages with this also has a similar shape. The details are shown in Figure 4 a.
Shown in b. That is, in the same figure a, the shape of the groove 8 is the first shape.
It is formed by a groove 10 having an angle α and a groove 11 having a second angle β. In Figure b, a buffer member 9 such as a polyurethane rubber ring is attached to the sheave groove 8.
The side that contacts the main wire rope 4 is formed by a portion 12 having a first angle α and a portion 13 having a second angle β, and the side that is engaged with the main wire rope 4 is V-shaped with an angle of γ° (not specified in particular). shall be formed.

When the traction sheave 2 configured in this way receives a load from the main wire rope 4, the main wire rope 4 is at the 0 point in normal traction as shown in Fig. 5, and the component force at this time is on the OA line and on the OB line. It is applied as a component force in the direction on the line. As mentioned above, the buffer body 9 is a high friction body, and sufficient traction can be obtained if the angle α is present.

However, if the shock absorber 9 is used for a long period of time and breaks due to fatigue or some kind of damage, the shock absorber 9 becomes detached from the traction sheave 3. At that time, the main wire rope 4 falls down to 0' into the groove 11 at the angle β and then contacts points A' and B'.

At that time, the acting force P on the main wire rope 4 is the component force
Although it is resolved into P ₁ and P ₂ , since the angle β is smaller than α, the acting force of the component forces P ₁ and P ₂ is larger than in the case of α, and this difference allows a large traction to be obtained.

In other words, by making β smaller than α, the shock absorber 9 can avoid unreasonable local pressure in a steady state, prolong its life, and even if it breaks, the angle β ensures safe traction, so it is safe. It can be used as a traction machine.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an elevator using the present invention;
Fig. 2 is a detailed sectional view of a traction sheave showing an embodiment of the present invention, Fig. 3 is an enlarged view of the main part of Fig. 2, and Fig. 4a shows an enlarged view of the groove shown in Fig. 3. FIG. 4b is a detailed sectional view of the buffer body shown in FIG. 3, and FIG. 5 is a diagram for explaining the present invention. 1... Traction machine, 2... Traction sheave, 4... Main wire rope, 8... Traction sheave groove, 9... Buffer body.

Claims (1)

[Claims] 1. Wrapping a rope around a sheave groove equipped with a buffer,
In this elevator sheave for raising and lowering a car using a rope, when the sheave groove is formed in a V-shape, the V-groove angle on the entrance side is α, the V-groove angle on the groove bottom side is β, and the above-mentioned two A sheave for an elevator, characterized in that the angles of the two V-shaped grooves are arranged in a relationship such that α>β (however, β≠0). 2. The elevator sheave according to claim 1, wherein the shape of the buffer body on the side in contact with the V-shaped groove is configured at an angle matching the angles of the two V-shaped grooves.