KR20230152857A - Sheave for elevator - Google Patents

Abstract

An elevator sheave for supporting and moving a flat belt that pulls an elevator car, comprising: a flat portion that supports the flat belt in direct contact and forms a moving path for the flat belt; and grooves machined in the circumferential direction at both ends of the flat portion, and the grooves have a function of losing support for the ends of the flat belt that reach the grooves when the flat belt moves laterally to one side along the axial direction of the sheave. A sheave for an elevator, characterized in that, is disclosed.

Description

Sheave for elevator {Sheave for elevator}

The present invention relates to a sheave for an elevator, and more specifically, to a sheave for an elevator that can easily prevent lateral movement of a flat belt without crowning processing.

Elevator systems suspend and move elevator cars using load bearing members such as ropes or belts.

Conventional elevator ropes are made by twisting metal wires or strands. Conventional ropes are durable and low in cost, but due to the nature of the metal material, they have the disadvantage of having to be thick to satisfy the tensile strength and being heavy. This leads to the problem of requiring a lot of energy to operate the elevator due to the heavy weight of the rope itself.

In addition, in the past, as the metal rope was in direct contact with the metal surface of the sheave, wear progressed rapidly, the rope replacement cycle was short, and there were problems in that noise was generated due to friction between metals.

In order to compensate for the problems of the conventional rope as described above, a belt coated with a soft material has been developed to protect the metal wire, which is a load-bearing part, and increase friction with the sheave. Belts are usually called flat belts or flat belts because their width in the transverse direction across the direction of extension is greater than their thickness and they have a generally flat surface.

Flat belts have a smaller diameter and lighter weight than existing steel wire ropes, so they can greatly contribute to reducing the weight and efficiency of elevator systems. In addition, by applying a flat belt, elevator components such as motors and traction machines can be made lighter and more compact, and the efficiency of the elevator installation space can be significantly improved.

In addition, since the contact surface of the flat belt with the sheave is not made of metal, wear is less than that of conventional metal ropes, which can significantly increase the replacement cycle. Additionally, the noise generated by friction between metals is reduced and ride comfort is improved. You can.

However, flat belts have problems with lateral movement while driving on the sheave. This refers to a phenomenon in which the flat belt that tows the elevator car moves in the axial direction of the sheave when it moves on the rotating sheave. Misalignment or path deviation of the flat belt is a problem that must be prevented as it can cause serious problems in elevator operation.

In order to solve the problem of lateral movement of flat belts, there is a known method of performing crowning processing on the surface of the sheave to help the belt move along the center of the sheave's path even when it is slightly misaligned. Prior literature on crowning processing of sheaves includes Korean Patent Publication No. 10-2002-0006524 (January 19, 2002).

More specifically, crowning processing is to make the center of the path of the flat belt on the sheave into a convex shape. When the flat belt deviates from the center of the path, the amount of belt deformation in the deviated and non-deviated parts changes, and a restoring force is generated, causing the flat belt to have a convex shape. It uses the principle of returning the belt to the center of the path.

Meanwhile, while the crowning processing method described above helps solve the problem of alignment between the flat belt and the sheave, it creates the following new problems.

First, due to the crown shape (convex shape) formed on the surface of the sheave, pressure is unevenly formed at the interface between the flat belt and the sheave, which leads to the problem of shortening the life of the belt.

In addition, due to the convex shape of the sheave, there are positions where the surface of the flat belt and the corresponding sheave surface have different velocities, and as a result, local slippage occurs between the surface of the flat belt and the sheave surface, causing wear of the belt. There are problems that arise.

In addition, the processing cost for the crowning process of the sheave increases, and in order to secure a margin for lateral movement of the flat belt, the sheave width must be manufactured to a certain size or more, which is a limitation in reducing the weight/miniaturization of the traction machine.

In other words, the problem of lateral movement during the drive of the flat belt can be solved through crowning processing of the sheave, but new problems that affect the lifespan or durability of the flat belt arise due to crowning processing, and additional problems are required to solve these problems. Because supplementary measures are needed, crowning processing cannot be viewed as a fundamental solution.

The present invention provides an elevator sheave and belt structure that can easily prevent the flat belt from moving laterally during operation without crowning processing, ultimately enabling the design of a lightweight/small traction machine. There is a purpose.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to one aspect of the present invention for achieving the above object, it is an elevator sheave for supporting and moving a flat belt that pulls an elevator car, wherein the flat belt is supported in direct contact and forms a movement path of the flat belt. flat part; and grooves machined in the circumferential direction at both ends of the flat portion, wherein the grooves have a bearing capacity for the ends of the flat belt that reach the grooves when the flat belt moves laterally to one side along the axial direction of the sheave. A sheave for an elevator can be provided, characterized in that it has a function of causing loss.

When the end of the flat belt reaches the groove and loses its support, a force is generated to deform the flat belt in a direction perpendicular to the surface where the flat belt and the sheave contact, and the component of the deforming force is used. Thus, the flat belt can be returned to its original position and lateral movement can be suppressed.

The flat portion may have the same circumference at any position, and a contact surface between the flat portion and the flat belt may be formed to be flat.

The flat portions are provided in a number corresponding to the number of the flat belts connected to the sheave, and when the flat portions are provided in plural, the grooves are formed at both ends of each of the flat portions, and the flat portions adjacent to each other are two. The groove formed between them can be shared with each other.

The flat belt is composed of a core body that supports a load, and a coating material surrounding the core body to protect the core body and maintain friction with the sheave, and the core body moves in the transverse direction when subjected to a force in the vertical direction. It may have a cross-sectional shape including a structure inclined downward toward the center of the flat belt and the contact surface between the flat belt and the sheave at least at both edges in the width direction of the flat belt so that restoring force can be generated.

According to the present invention as described above, even if crowning processing is not performed on the sheave on which the flat belt is contacted and supported, the phenomenon of the flat belt moving laterally during driving can be easily prevented, and the width of the sheave can be reduced according to the non-application of crowning processing. can be reduced, and ultimately has the effect of enabling the design of a lightweight and compact traction machine.

The effects of the present invention are not limited to the effects described above, and other effects not mentioned may be clearly understood from the description below.

Figure 1 is a view showing a sheave for an elevator according to the present invention, where (a) is a front view and (b) is a side view.
Figure 2 is a view showing a state in which a flat belt is connected to an elevator sheave according to the present invention, where (a) is a front view and (b) is a side view.
Figure 3 is a cross-sectional view of an elevator belt according to the present invention.
Figure 4 is a diagram showing the operation of a flat belt driven on an elevator sheave according to the present invention, where (a) shows the normal state, (b) shows the lateral movement of the flat belt, and (c) shows the return operation of the flat belt. will be.
Figure 5 is a diagram showing modified examples of the elevator belt according to the present invention.

In order to fully understand the present invention, its operational advantages, and the purposes and effects achieved by practicing the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Matters expressed in the drawings attached to this specification are schematic to easily explain embodiments of the present invention and may be somewhat different from the actual implementation form. The size of each component shown in the drawings may be exaggerated or reduced for explanation and does not mean the size actually applied.

The terminology used herein is merely used to describe specific embodiments and is not intended to limit the invention. For example, in this specification, “including” a certain component does not mean excluding other components, but may further include other components, unless specifically stated to the contrary.

In addition, it should be understood that saying that a component is 'connected' to another component includes direct connection as well as indirect connection, and that other components may exist between the two components. Singular expressions may be interpreted to include plural expressions unless the context clearly indicates otherwise.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. The embodiments described below are provided so that those skilled in the art can easily understand the technical idea of the present invention, and the present invention is not limited thereto.

Figure 1 is a view showing a sheave for an elevator according to the present invention, where (a) is a front view and (b) is a side view. Figure 2 is a view showing a state in which a flat belt is connected to an elevator sheave according to the present invention, where (a) is a front view and (b) is a side view. Figure 3 is a cross-sectional view of an elevator belt according to the present invention. Figure 4 is a diagram showing the operation of a flat belt driven on an elevator sheave according to the present invention, where (a) shows the normal state, (b) shows the lateral movement of the flat belt, and (c) shows the return operation of the flat belt. will be. Figure 5 is a diagram showing modified examples of the elevator belt according to the present invention.

Referring to Figures 1 and 2, the present invention relates to a belt-type elevator system that uses a flat belt instead of an existing rope to suspend and move an elevator car, and includes a flat belt 100 that tows an elevator car (not shown). The elevator car may be configured to go up and down by hanging on the sheave 200 and rotating the sheave 200 with a motor (not shown).

The flat belt 100 connects the elevator car and the counterweight and can obtain traction due to friction on the sheave 200, which is rotated by a motor.

The sheave 200 includes a cylindrical body that supports the flat belt 100 and can be rotated by a motor. At least one flat belt 100 may be connected to one sheave 200. In this specification, as an embodiment, three flat belts 100 are connected to one sheave 200 in parallel at a predetermined interval.

Figure 3 shows a cross section along the width direction of the flat belt 100. Referring to FIG. 3, the flat belt 100 according to the present invention includes a core 110 that supports the load of the elevator car and/or counterweight, protects the core 110, and maintains friction with the sheave 200. To do this, it may be composed of a coating material 120 surrounding the core 110.

The core body 110 is a member that actually supports the load imposed in the direction in which the flat belt 100 extends, for example, the force (load) caused by an elevator car or counterweight pulled by the flat belt 100. Although not shown in the drawing, a wire rope may be inserted into the core body 110.

The core body 110 may be configured to have transverse elastic force. Here, having lateral elastic force may mean that a restoring force occurs in the lateral direction when deformed (when subjected to force) in the vertical direction, and the present invention provides the elastic force in the lateral direction through the material and shape of the core 110. We want to implement elasticity.

Specifically, a non-metal reinforced fiber composite material, more preferably carbon fiber reinforced plastics (CFRP), can be used as a material for the core body 110.

Additionally, the core body 110 may include a structure in which a cross-section in the transverse direction crossing the extension direction of the flat belt 100 is downward toward the center of the belt. More preferably, the core 110 may include a structure that is downward toward the contact surface between the flat belt 100 and the sheave 200 at least at the edge portion.

The cross-sectional shape of the core body 110, which rises away from the contact surface between the flat belt 100 and the sheave 200 toward both edges along the width direction of the flat belt 100, is lateral when deformation occurs in the vertical direction. It can create resilience. And the lateral restoring force generated at this time acts as a force to prevent lateral movement of the flat belt 100. This will be described in more detail later with reference to FIG. 4.

The most basic shape applicable to the cross-sectional shape of the core body 110 is a 'V' shape in which the included angle is formed as an obtuse angle, as shown in FIG. 3. However, the cross-sectional shape of the core body 110 according to the present invention is not limited to this, and any shape that can generate a restoring force in the lateral direction when subjected to a force in the vertical direction can be applied.

FIG. 5 shows examples of possible modifications to the core body 110. Referring to (a) of FIG. 5, the core body 110 is the center of the flat belt 100 and includes a curved portion inclined downward toward the contact surface between the flat belt 100 and the sheave 200, and has an approximately 'U' shape. You can also have

In addition, as will be described later, the flat belt 100 loses its support at the edge when one end reaches the groove 220, so even in the case of the core 110 disposed inside the flat belt 100, at least the edge It is sufficient to include a downwardly sloping structure in the part, and therefore, not only can the bent portion be formed once, such as the 'V' shape shown in FIG. 3, but also the 'W' shape shown in (b) of FIG. It may also include two or more bent parts.

That is, in order to generate an elastic restoring force for returning the flat belt 100 to its original position in the present invention, the cross-sectional shape of the core body 110 must include a structure that slopes downward at least at both edge portions.

In addition, according to the structure of the present invention in which the core body 110 includes a bend or bend as described above, the cross-sectional area of the core body 110 increases compared to a conventional belt having the same width, so that more load can be transmitted. Additional effects can also be achieved.

The cross-sectional shape of the core body 110 may be formed uniformly along the extension direction of the flat belt 100. Additionally, when viewed from the cross-sectional direction of the flat belt 100, the core body 110 is continuously connected. That is, the core body 110 has a continuous shape without interruption from one end to the other end along the width direction of the flat belt 100, so that an elastic force (elastic restoring force) acts in the upward direction when deformed, as will be described later. . If the core body 110 has a divided or disconnected structure along the width direction of the flat belt 100, it is difficult to generate elastic force.

The coating material 120 may be made of an elastomer with a high coefficient of friction, such as polyurethane, such that the friction between the flat belt 100 and the sheave 200 is sufficient to move the flat belt 100.

Referring again to FIGS. 1 and 2, the sheave 200 according to the present invention includes a flat portion 210 on which the flat belt 100 is supported in direct contact, and a sheave 200 at both ends of the flat portion 210. ) may include a groove 220 processed in the circumferential direction.

The flat portion 210 forms the path of the flat belt 100. When the sheave 200 is driven to rotate, the flat belt 100 moves along the path of the flat portion 210, and at this time, it is best to maintain alignment so that the flat belt 100 does not deviate from the center of the path.

The flat portion 210 may have a flat contact surface with the flat belt 100. That is, the flat portion 210 forming the path of the flat belt 100 may have the same overall circumference without any convex portions. The distance from the axis of the sheave 200 to the surface constituting the flat portion 210 may all be formed to be the same.

Meanwhile, grooves 220 for preventing lateral movement of the flat belt 100 are formed at both ends of the flat part 210 on the surface in contact with the flat belt 100 on the sheave 200 along the circumferential direction of the sheave 200. can be formed.

When a plurality of flat portions 210 are formed, grooves 220 may be formed at both ends of each, and adjacent flat portions 210 may share the grooves 220 formed between them. Therefore, in this embodiment in which three flat portions 210 are formed in one sheave 200, a total of four grooves 220 can be formed.

The groove 220 functions to lose support for the end of the flat belt 100 in the direction in which the flat belt 100 moves when lateral movement occurs. Specifically, when one end of the flat belt 100 moved laterally along the axial direction of the sheave 200 reaches the groove 220, the end of the flat belt 100 that reaches the groove 220 is connected to the sheave 200. Loss of support due to .

The reason why the support force for the end of the flat belt 100 where lateral movement has occurred in this way is intentionally lost is that the core body 110 composed of an elastic body inside the flat belt 100 moves upward at the portion where the support force is lost. Focusing on the fact that it causes more deformation, the horizontal component of the force (hereinafter described as 'elastic restoring force') generated diagonally above the contact surface of the flat belt 100 and the sheave 200 is divided into the flat belt. The intention is to use (100) as a force to return it to its original position.

Referring to FIG. 4, the operation of returning the flat belt 100, which has undergone lateral movement, to its original position according to the application of the present invention will be described in more detail.

First, as shown in (a) of FIG. 4, there is no problem in the normal state in which the flat belt 100 moves within the path of the flat portion 210.

However, as shown in (b) of FIG. 4, there are cases where the flat belt 100 moves laterally to one side along the axial direction of the sheave 200 due to some reason. At this time, in the present invention, as the end of the flat belt 100 that deviates from the flat portion 210 reaches the groove 220 and loses its support force, an 'elastic restoring force' is generated in the core body 110 inside the flat belt 100. . This elastic restoring force increases as the flat belt 100 rides on the groove 220.

That is, as shown in (c) of FIG. 4, an elastic restoring force that causes the core body 110 to deform in the vertical direction is generated at the portion where the support force for the end of the flat belt 100 is lost, and the horizontal direction of the elastic restoring force is generated. The component force acts as a 'belt restoration force' to return the flat belt 100 to its original position. That is, when the support force for the end of the flat belt 100 is lost, an elastic restoring force is generated in the vertical direction on the elastic surface of the core body 110, and the horizontal component of the elastic restoring force suppresses the lateral movement of the flat belt 100. It acts as a force.

Meanwhile, this embodiment suggests that the groove 220 is formed outside the position where the flat belt 100 is placed, but the groove 220 may be slightly inside the flat belt 100. That is, when the flat belt 100 is initially aligned, it does not matter if a part of the end of the flat belt 100 is already located on the groove 220, and both ends of the flat belt 100 need only be in the same position.

In other words, the flat portion 210 formed on the sheave 200 does not necessarily have a width equal to or greater than the width of the flat belt 100, and covers at least most of the area including the center of the flat belt 100. All it has to do is have a contact surface with this flat part 210.

Additionally, the shape of the groove 220 may include any shape that can cause the end support of the flat belt 100 to be lost in addition to a semicircular shape. In other words, the groove 220 can be of any shape as long as it creates an empty space below the end of the flat belt 100 when the flat belt 100 moves laterally. It should be noted that the purpose of the groove 220 in the present invention is not to contact wires or ropes, but to form an empty space in order to lose the support force at the end of the flat belt 100.

Conventionally, the cross-sectional shape of the core body placed inside the flat belt was flat or separated, so it was not possible to generate restoring force when the flat belt moved laterally. As explained in the background technology, the shape of the sheave was crowned to be convex to make the belt more flexible. It was best to prevent lateral movement.

On the other hand, the present invention is a technology for preventing lateral movement of the flat belt 100 supported by the sheave 200 without crowning processing of the sheave 200, and the shape of the core body 110 of the flat belt 100 and the sheave are It is characterized by preventing lateral movement of the flat belt 100 by generating a restoring force according to the shape of the groove 220 of (200).

In order to generate a restoring force against the lateral movement of the flat belt 100, the core body 110 disposed inside the belt must have a special cross-sectional structure, and the grooves 220 of the sheave 200 must be used during the lateral movement of the flat belt 100. It must be formed at certain positions at both ends along the width direction of the flat belt 100 so that the ends can lose support.

According to the present invention as described above, even if crowning processing is not performed on the sheave 200 on which the flat belt 100 is supported in contact, it is possible to easily prevent the flat belt 100 from moving laterally during operation, By not applying crowning processing, the width of the sheave 200 can be reduced, which ultimately has the effect of enabling the design of a lightweight and compact traction machine.

The present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations should be considered to fall within the scope of the claims of the present invention.

100: Flat belt
110: body
120: Coating material
200: Sieve
210: flat part
220: Home

Claims (5)

An elevator sheave for supporting and moving a flat belt that tows an elevator car,
a flat portion that supports the flat belt in direct contact with it and forms a movement path of the flat belt; and
It includes grooves machined in the circumferential direction at both ends of the flat portion,
The groove is characterized in that it functions to lose support for the end of the flat belt that reaches the groove when the flat belt moves laterally to one side along the axial direction of the sheave,
Sheaves for elevators.
In claim 1,
When the end of the flat belt reaches the groove and loses its support, a force is generated to deform the flat belt in a direction perpendicular to the surface where the flat belt and the sheave contact, and the component of the deforming force is used. Characterized in that the flat belt is returned to its original position and lateral movement is suppressed.
Sheaves for elevators.
In claim 2,
The flat portion has the same circumference at any position, and the contact surface between the flat portion and the flat belt is formed flat.
Sheaves for elevators.
In claim 3,
The flat portions are provided in a number corresponding to the number of the flat belts connected to the sheave, and when the flat portions are provided in plural, the grooves are formed at both ends of each of the flat portions, and the flat portions adjacent to each other are two. Characterized in that the groove formed between them is shared with each other,
Sheaves for elevators.
In claim 3,
The flat belt is composed of a core body that supports a load, and a coating material surrounding the core body to protect the core body and maintain friction with the sheave,
The core body is inclined downward toward the center of the flat belt and the contact surface between the flat belt and the sheave at least at both edges in the width direction of the flat belt so that a restoring force can be generated in the lateral direction when subjected to force in the vertical direction. Characterized by having a cross-sectional shape comprising,
Sheaves for elevators.

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