JP2006206202A - Sheave device for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the generation of noise by avoiding or reducing collision of main ropes to each other in an elevator having an unstable driving system, in which vibration of the main rope sometimes occurs. <P>SOLUTION: Moving sheaves 2, 3 and 5 are fitted to a lower part of an elevator car and an upper part of a counterweight. A driving sheave 6 of a hoisting machine is arranged so that axial direction thereof is displaced at 90° against the axial direction of the moving sheaves. The moving sheaves and the driving sheave are provided with a plurality of grooves 8 in the peripheral parts thereof, and a plurality of the main ropes 7 are wound around the grooves. When the hoisting machine is driven, the main ropes are moved in the longitudinal direction to elevate the elevator car and the counterweight. The groove of the sheave is formed so that an interval between the adjacent grooves that positioned outside thereof is formed larger. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elevator sheave device that transmits a driving force of a hoisting machine to a car and a counterweight to raise and lower the car and the counterweight, and more specifically, two sheaves arranged in different axial directions. The present invention relates to an elevator sheave device configured to be able to reduce a collision sound between main ropes generated by shaking of a plurality of main ropes wound around the main rope.

  FIG. 6 is a schematic configuration diagram of an example of an elevator configured by 2: 1 roping. A plurality of car sheaves 2 and 3 provided at the lower part of the car 1, a counter sheave 5 provided at the upper part of the counterweight 4, and a drive sheave 6 rotated by a hoist installed at the upper part of the hoistway. A main rope 7 (only one is shown) is wound, and when the hoisting machine is driven, the main rope 7 moves in the longitudinal direction, and the driving force of the hoisting machine is changed to sheaves 2, 3, The car 1 and the counterweight 4 are transmitted to the car 1 and the counterweight 4 through 5, and the car is raised and lowered. The car sheaves 2 and 3 and the counter sheave 5 and the drive sheave 6 are arranged so that their axial directions differ by 90 °.

  Here, there is a phenomenon in which large swinging occurs in the portion 7a between the car sheave 3 and the drive sheave 6 and the portion 7b between the counter sheave 5 and the drive sheave 6 in the main rope 7 while the car 1 is moving up or down. . As a result, when 7a and 7b come into contact with each other, a collision sound called crackling is generated, which causes noise.

  One of the causes for inducing such vibration of the main rope 7 is a resonance phenomenon of the main rope 7 in which the biting of the main rope 7 with respect to the sheaves 2, 3, 5 and 6 serves as an excitation source. .

  FIG. 7 is an explanatory view schematically showing a cross section of the main rope 7. When the main rope 7 advances in the vertical direction with respect to the paper surface as the car 1 moves up or down, it can be considered that the strand S constituting the main rope 7 rotates in the direction of the arrow due to the twist. If the natural frequency of the system of the main rope 7a or 7b coincides with the frequency generated by the unevenness of the strand S due to this rotation, a vibration with a large amplitude occurs due to resonance.

  In order to suppress the occurrence of this resonance, it is conceivable to increase the tension acting on one main rope 7 by reducing the number of main ropes 7 or adding dead weight to the car 1. According to this, the natural frequency of the system of the main rope 7 can be shifted, and resonance can be avoided. Various main rope steadying devices for the purpose of physically suppressing the shake itself have been proposed.

  However, the method of reducing the number of main ropes 7 or adding dead weight is not a preferable method for the life of the main rope 7 because the load applied to one main rope 7 is increased.

  Further, the steady rest device can be configured relatively easily, for example, when the portion 7c between the sheaves 2 and 3 of the car 1 in the main rope 7 is targeted, and an embodiment thereof is also proposed. .

  However, when the portions 7a and 7b on the route through which the car 1, the counterweight 4 and the like of the main rope 7 pass are targeted, when the car 1 and the counterweight 4 pass, they escape so as not to hit them. It is necessary to provide this mechanism, and its structure and control become complicated, so there are many that are not very practical.

  The present invention has been made in view of the above problems, and in an elevator having an unstable drive system in which the main rope shakes, noise can be reduced by avoiding or reducing collision between the main ropes. There is to be able to do it.

  To achieve the above object, according to a first aspect of the present invention, there is provided a first sheave having a plurality of grooves on the outer peripheral portion, a plurality of grooves on the outer peripheral portion, and an axial direction being the axial direction of the first sheave. The second sheave arranged differently from the first sheave and the grooves of the first and second sheaves are moved in the longitudinal direction when the hoisting machine is driven to move up and down the car and the counterweight. A plurality of main ropes, and at least one groove of the first sheave and the second sheave is formed such that an interval between adjacent grooves is larger as the distance is more outward. It is characterized by that.

  In addition, the second invention has a first sheave having a plurality of grooves on the outer peripheral portion and a plurality of grooves on the outer peripheral portion, and the axial direction is different from the axial direction of the first sheave. The second sheave and a plurality of main ropes that are wound around the grooves of the first and second sheaves and move in the longitudinal direction by driving the hoist to raise and lower the car and the counterweight. And the number of grooves in at least one of the first sheave and the second sheave is larger than the number of the main ropes.

  Further, the third invention is arranged such that the first sheave having a plurality of grooves on the outer peripheral portion and the plurality of grooves on the outer peripheral portion and having an axial direction different from the axial direction of the first sheave. The second sheave and a plurality of main ropes that are wound around the grooves of the first and second sheaves and move in the longitudinal direction by driving the hoist to raise and lower the car and the counterweight. One of the first sheave and the second sheave is formed such that a distance between adjacent grooves is larger as the outer groove is located, and the second sheave And the number of the other groove of the first sheave is larger than the number of the main ropes.

  According to the present invention, noise can be reduced by avoiding or reducing collisions between main ropes in an elevator having an unstable drive system in which vibrations occur in the main ropes.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged view of a main part of the first embodiment of the present invention. In the following embodiments, the same reference numerals are used for parts that are the same as or similar to those of the prior art described above, and redundant descriptions are omitted.

  As shown in FIG. 1, in this embodiment, the same number of grooves 8 as the main rope 7 are provided on the outer periphery of the moving sheaves 2, 3, 5, such as a car sheave and a counter sheave, and the drive sheave 6. In addition, the gap between adjacent grooves 8 is formed so as to increase as it is located on the outer side.

  That is, the interval between the two grooves 8 located in the center is p1, the interval between the center groove 8 and the adjacent groove 8 is p2, the outermost groove 8 and the adjacent groove If the interval between the two is pn, p1 <p2 <.

  In an elevator system in which the moving sheave and the driving sheave are arranged so that the directions of the central axes are different by 90 °, and the twist angle of the main rope passing between the moving sheave and the driving sheave is 90 °, the main rope shakes. Then, the amplitude of the main rope wound around the groove on the outer side of the sheave increases, but according to the present embodiment, the groove located on the outer side of the sheave increases the distance between adjacent grooves, so It is possible to avoid or reduce the collision between the main ropes.

  For all the grooves, the same effect can be obtained even if the interval between adjacent grooves is increased to pn, but in this embodiment, the sheave thickness can be reduced as compared with such a case. Therefore, there is an effect that space saving can be achieved.

  Next, a second embodiment of the present invention will be described. FIG. 2 is an enlarged view of a main part of the second embodiment of the present invention.

  In the present embodiment, the number of grooves 8 of the moving sheaves 2, 3, 5 and the drive sheave 6 is greater than the number of main ropes 7, and these grooves 8 are provided at equal intervals p. Of these grooves 8, the main rope 7 is not wound around some of the grooves 8.

  For example, in the case of a hoisting machine integrated with a driving sheave, such as a flat PMSM (permanent magnet synchronous motor) hoisting machine, it is impossible to replace only the driving sheave at the site where the elevator is installed.

  However, according to the present embodiment, since the sheave having a larger number of grooves than the main rope 7 in advance, the first implementation can be performed only by changing the winding position of the main rope 7 at the installation site of the elevator. The same effect as the form can be obtained.

  In addition, since it is not necessary to increase the types of grooves to be processed in the sheave, the manufacturing cost does not increase and it is economical.

  Next, a third embodiment of the present invention will be described. FIG. 3 is an explanatory view of the structure of the main part of the third embodiment of the present invention.

  In the present embodiment, the drive sheave 6 is arranged such that the direction of the central axis thereof forms 90 ° with the direction of the central axis of the moving sheaves 2, 3, and 5. Further, the moving sheaves 2, 3 and 5 are configured such that the distance between the adjacent grooves 8 is larger as in the first embodiment, and the driving sheave 6 is as follows. As in the second embodiment, the number of grooves 8 is greater than the number of main ropes 7, and these grooves 8 are provided at equal intervals p. The circle drawn with a broken line in the figure indicates the position of the main rope 7 when the distance between the adjacent main ropes 7 is the smallest in the intermediate portion between the moving sheaves 2, 3, 5 and the drive sheave 6. Represents.

  According to the present embodiment, the interval between the main ropes 7 adjacent to each other can be widened from the drive sheave 6 and the ends of the moving sheaves 2, 3 and 5 arranged below the drive sheave 6, so that the main rope The frequency of collision between the seven members is reduced, and noise due to the collision can be reduced.

  Next, a fourth embodiment of the present invention will be described. FIG. 4 is an enlarged view of a main part of the fourth embodiment of the present invention.

  In the present embodiment, of the grooves 8 provided in the moving sheaves 2, 3 and 5, the outermost groove 8 has both sides of the center line P passing through the center in the width direction and extending in the radial direction of the sheave. The cross-sectional shape is asymmetric. That is, the groove 8 has a main angle when the angle formed by the center line P and the inclined surface on the outer peripheral side of the groove 8 is a, and the angle formed by the center line P and the inclined surface on the inner peripheral side of the groove 8 is b. The angle b of the inner inclined surface that is the twisting direction of the cord is formed to be larger than the angle a of the outer inclined surface.

  As shown in FIG. 3, when the twist angle of the main rope 7 is 90 °, the main rope 7 wound around the outermost groove 8 particularly enters the diagonal at a large angle with respect to the groove 8. The restraining force in the lateral direction becomes stronger, which greatly affects the above-described main rope 7 runout and life.

  According to the present embodiment, the lateral restraint force can be relaxed by increasing the angle b of the inclined surface in the twist direction of the main rope.

  As the number of main ropes 7 is large and the thickness of the sheave is large, and as the reapproach distance between the two sheaves is small, the inclination angle of the main rope 7 entering the outermost groove increases. The effect by the structure of this embodiment can be expected.

  Next, a fifth embodiment of the present invention will be described. FIG. 5 is an enlarged view of a main part of the fifth embodiment of the present invention.

  The moving sheave and the driving sheave are rotatably supported by the sheave support frame, and are attached to the structure of the car and the counterweight via the sheave support frame. In the present embodiment, the sheave support frame is attached to the structure of the car and the counterweight so as to be movable in the sheave axial direction.

  As in the first embodiment, the sheaves are configured such that the gap between adjacent grooves is larger on the outside, and the number of the sheaves is larger than that of the main rope as in the second embodiment. A sheave having a groove is thicker than a normal sheave, but in this embodiment, such a sheave can be attached to a structure of a car or a counterweight without using an adapter.

  That is, as shown in FIG. 5, the sheave support frame 10 includes a side plate 10 a disposed on one surface side of the sheaves 2, 3, 5, and 6, and the other surface side of the sheaves 2, 3, 5, and 6. The structure 9 of the car and the counterweight is provided with a plurality of long holes 9a extending in the sheave axial direction at locations facing the upper surfaces of the side plates 10a and 10b. It is formed at intervals in the radial direction. The sheave support frame 10 is fixed to the structure 9 with screws 11 that pass through the long holes 9a.

  According to such a configuration, even when the thickness of the sheaves 2, 3, 5, 6 increases as the pitch between the grooves of the sheaves 2, 3, 5, 6 increases and the number of grooves increases, an adapter, etc. Without using the sheave, the sheave support frame 10 can be attached to the structure 9 so that the center coincides with the vertical direction as in the case of a normal sheave. Accordingly, the sheave mounting work at the elevator installation site is facilitated.

  That is, if the screw 11 is located within the range of the shortest mounting pitch C and the maximum mounting pitch D between the long hole 9a facing the side plate 10a of the sheave support frame 10 and the long hole 9b facing the side plate 10b. The sheave support frame 10 can be attached to the structure 9.

  In each of the above embodiments, the present invention has been described for the case where the structure of the present invention is applied between a drive sheave driven by a hoisting machine and a moving sheave mounted on a passenger car or a counterweight. However, the present invention is not limited to this case, and is similar when applied between sheaves arranged so as to cause twisting of the main rope (for example, between fixed deflecting sheaves in a hoisting machine horizontal pulling type). The effect of can be obtained.

  In addition, various modifications can be made to the above-described embodiments without departing from the gist of the present invention.

The principal part enlarged view of the 1st Embodiment of this invention. The principal part enlarged view of the 2nd Embodiment of this invention. Structure explanatory drawing of the principal part of the 3rd Embodiment of this invention. The principal part enlarged view of the 4th Embodiment of this invention. The principal part enlarged view of the 5th Embodiment of this invention. The schematic block diagram of an example of the elevator comprised by 2: 1 roping. The cross-sectional schematic diagram of the main rope of the elevator of FIG.

Explanation of symbols

1 Car 2 Moving sheave (first sheave)
3 Moving sheave (first sheave)
5 Moving sheave (first sheave)
6 Drive sheave (second sheave)
7 main rope 8 groove 9 structure 9a long hole 10 sheave support frame

Claims (5)

  A first sheave having a plurality of grooves on the outer peripheral portion; a second sheave having a plurality of grooves on the outer peripheral portion and arranged so that the axial direction is different from the axial direction of the first sheave; A plurality of main ropes that are wound around the grooves of the first and second sheaves and move in the longitudinal direction when the hoisting machine is driven to raise and lower the car and the counterweight. The sheave device for an elevator, wherein at least one groove of the sheave and the second sheave is formed so that a distance between adjacent grooves is larger as it is located on the outer side.   A first sheave having a plurality of grooves on the outer peripheral portion; a second sheave having a plurality of grooves on the outer peripheral portion and arranged so that the axial direction is different from the axial direction of the first sheave; A plurality of main ropes wound around the grooves of the first and second sheaves and moved in the longitudinal direction when the hoisting machine is driven to raise and lower the passenger car and the counterweight; A sheave device for an elevator, wherein the number of grooves in at least one of the sheave and the second sheave is greater than the number of the main rope.   A first sheave having a plurality of grooves on the outer peripheral portion; a second sheave having a plurality of grooves on the outer peripheral portion and arranged so that the axial direction is different from the axial direction of the first sheave; A plurality of main ropes wound around the grooves of the first and second sheaves and moved in the longitudinal direction when the hoisting machine is driven to raise and lower the passenger car and the counterweight; One of the sheaves of the first sheave and the second sheave is formed so that the distance between the adjacent grooves is larger toward the outer side, and the second sheave and the first sheave are The elevator sheave device characterized in that the number of the other groove is greater than the number of the main ropes.   In at least one of the first sheave and the second sheave, the outermost groove among the grooves provided on the outer peripheral portion thereof passes through the center portion in the width direction and extends in the radial direction of the sheave, and the The angle formed between the inclined surface on one side is a, the angle formed between the center line and the inclined surface on the other side is b, and the inclined surface on the other side is the side where the main rope is twisted. 4. The elevator sheave device according to claim 1, wherein the elevator sheave device is formed such that a <b. The first sheave or the second sheave is formed so that an interval between the adjacent grooves is larger as the distance between the adjacent grooves is larger, or the number of the grooves is larger than the number of the main ropes. The sheave device for an elevator according to any one of claims 1 to 4, wherein the sheave support frame to be supported is attached to an attached object so as to be movable in a sheave axial direction.

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