KR102013159B1 - Sehave for elevator - Google Patents

Abstract

The present invention relates to a sheave for an elevator. According to an embodiment of the present invention, a sheave for an elevator comprises: a main body provided with a coupling hole which is provided at the center thereof and fitted to a drive shaft of a winding machine for transmitting rotation power, the main body performing a rotational movement in a predetermined direction as the drive shaft is driven; and a lifting pulley which is provided in a ring shape, and coupled and provided so that the inner circumferential surface thereof is in contact with the outer circumferential surface of the main body, the lifting pulley lifting a wire rope by having a rope receiving groove on the outer circumferential surface thereof to allow the wire rope to be hung. On the outer circumferential surface of the main body, one or more protrusions formed discontinuously are formed. The lifting pulley is formed by direct injection molding on the outer circumferential surface of the main body and fastened integrally to form grooves corresponding to the protrusions on the inner circumferential surface.

Description

Sheave for elevators {SEHAVE FOR ELEVATOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheave for an elevator. Specifically, a main body receiving a rotational force directly from a drive shaft of an elevator hoisting machine, and an area in which the wire rope is walked, are combined with the main body described above to provide a wire rope. The invention relates to an elevator sheave which further improves safety by improving the fastening structure of the lifting pulley for driving the lifting car coupled to the end up or down.

In general, the elevator is equipped with a lifting car at one end of the wire rope, the weight is mounted at the other end, the wire rope is wound on the sheave connected to the hoist and rotates as the hoist operates, and as the sheave rotates The lifting car is raised or lowered by the lifting or lowering of the wire rope wound on the hoisting sheave.

On the other hand, in recent years, the development of a technology for reducing the material cost in producing an elevator sheave by dualizing the material of the main body receiving the rotational force from the hoist and the lifting pulley is wound wire rope is made, an example of this As an example, there is Korean Patent Publication No. 10-2010-0041262 (a hoist pulley of an elevator in which only worn rope guides can be replaced).

At this time, in the above-mentioned prior art, in the structure of the guide portion for guiding the rope composed of one or more units and the hoisting pulley composed of one or more body unit and shaft supporting the load and the rope guide of the rope, the rope guide Disclosed is a technique for reducing the manufacturing cost by combining the material of the body portion and the pulley body by using a coupling member such as a fastener, but in the case of the prior art described above, it is possible to effectively reduce the material cost. Although there is an advantage, when using different materials, when the temperature difference becomes extreme due to external environmental factors, such as climate change, the coupling between the parts constituting the elevator sheave is abnormal because each material has a different coefficient of thermal expansion. It was easy to cause accidents that were separated into There was a serious problem that could lead to large-scale accidents that result in damage.

Accordingly, the present invention improves the safety of the coupling structure between the main body and the lifting pulley of the conventional elevator sheave, which has a risk of accident due to the deformation of the coupling structure of the components due to different thermal expansion coefficients between the components constituting the sheave. It is a first object to provide this more improved sieve for elevators.

In addition, a second object of the present invention is to provide an elevator sheave that can improve the structure of the sheave to effectively use the rotational force transmitted through the drive shaft of the hoist and to reinforce the strength of the sheave.

In order to achieve the above object, the sieve for an elevator according to an embodiment of the present invention, the coupling hole is fitted to the driving shaft of the hoisting machine for transmitting the rotational power in the center, the drive shaft is driven in a predetermined direction as the drive A main body performing a rotational movement of the main body; And a lifting pulley provided in a ring shape to be coupled to the inner circumferential surface of the main body to be in contact with the outer circumferential surface, and having a rope receiving groove for the wire rope to be hooked on the outer circumferential surface to lift the wire rope. On the outer circumferential surface of the main body, at least one protrusion is formed discontinuously, the lifting pulley is injection molded directly to the outer circumferential surface of the main body integrally fastened integrally, so that a groove corresponding to the protrusion is formed on the inner circumferential surface It is done.

The main body described above is preferably provided with at least one metal steel of aluminum, alloy steel, and carbon steel, and the lifting pulley is preferably provided with a synthetic resin material.

The above-mentioned lifting pulley, one or more annular hollow portion along the circumferential direction is formed in one region of the inner region except the region to which the protrusion of the main body is coupled.

The above-mentioned lifting pulley, the inlet portion drawn in a predetermined depth along the circumferential direction in the inner region; is formed at least one, the inlet portion is preferably formed at an equal angle on the front and rear of the lifting pulley.

It is preferable that a coating agent composed of at least one polymer compound of polyurethane, butyl rubber, and polyamide-imide is applied to the outer exposed surface of the rope receiving groove.

According to an embodiment of the present invention, the coupling between the main body and the lifting pulley of the conventional elevator sheave, which has a risk of accidents by deforming the coupling structure of the components as the thermal expansion coefficient between the components constituting the sieve is different, the time passes By improving the structure, there is an effect that can provide an elevator sheave with improved safety.

In addition, according to an embodiment of the present invention, the inlet portion drawn to the predetermined depth and the annular hollow portion formed in the lifting pulley can effectively reduce the weight of the lifting pulley while reinforcing the stiffness required to drive the elevator sieve. In this way, it is possible to reduce the driving force required to drive the sheave to achieve energy savings.

In addition, according to an embodiment of the present invention, the outer exposed surface of the rope receiving groove, that is, the contact surface to which the wire rope is in contact, polyurethane, butyl rubber, polytetrafluoroethylene (poly (tetrafluoroethylene )) And polyamide-imide, which is coated with a high friction compound such as a high-molecular compound, is applied to prevent the wire rope from slipping effectively, making it possible to use it stably, and to provide the driving force necessary for lifting the car. There is a supplementary effect.

1 is a perspective view of an elevator sheave according to an embodiment of the present invention.
2 is an example in which the main body and the lifting pulley are combined according to an embodiment of the present invention.
3 is an example in which protrusions are formed on an outer circumferential surface of a main body according to an embodiment of the present invention.
Figure 4 is a comparison of the sieve structure according to an embodiment of the present invention and a conventional sieve structure.
Figure 5 is an example in which the polymer compound is coated on the rope receiving groove according to an embodiment of the present invention.

In the following, various embodiments and / or aspects are now disclosed with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects. However, it will also be appreciated by one of ordinary skill in the art that this aspect (s) may be practiced without these specific details. The following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more aspects. However, these aspects are exemplary and some of the various methods in the principles of the various aspects may be used and the descriptions described are intended to include all such aspects and their equivalents.

As used herein, “an embodiment”, “an example”, “aspect”, “an example”, and the like, may not be construed that any aspect or design described is better or advantageous than other aspects or designs. .

In addition, the terms "comprises" and / or "comprising" mean that such features and / or components are present, but exclude the presence or addition of one or more other features, components, and / or groups thereof. It should be understood that it does not.

In addition, terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein including technical or scientific terms are generally understood by those skilled in the art to which the present invention belongs. It has the same meaning. Terms such as those defined in the commonly used dictionaries should be interpreted as having meanings consistent with the meanings in the context of the related art, and ideally or excessively formal meanings are not defined clearly in the embodiments of the present invention. Not interpreted as

The present invention relates to a sheave for an elevator, and more specifically, a main body 10 directly receiving rotational force from a drive shaft of an elevator hoisting machine, and a lifting car coupled to an end of a wire rope by a wire rope being hooked. By improving the fastening structure of the lifting pulley 20 to drive the up or down) is related to an elevator sheave for improved safety.

More specifically, the present invention is different from each other, the thermal expansion coefficient between the components constituting the sieve is changed over time, the coupling structure of the components deformed as the risk of an accident, the main body 10 and the lifting pulley 20 of the conventional elevator sieve The first object of the present invention is to provide a sieve for an elevator having improved safety by improving the coupling structure of a), and to effectively use the rotational force transmitted through the drive shaft of the hoist to improve the structure of the sieve, and to reinforce the strength of the sieve. A second object is to provide an elevator sheave.

Hereinafter, an elevator sheave according to the present invention will be described in more detail with reference to the accompanying drawings. First, FIG. 1 illustrates a perspective view of an elevator sheave according to an embodiment of the present invention.

The sieve for the elevator described above may be preferably composed of the main body 10 and the lifting pulley 20.

At this time, the main body 10 is provided with a coupling hole 11 which is fitted to the drive shaft of the hoist which transmits rotational power to the center, and performs the rotational movement in a predetermined direction as the drive shaft is driven. .

On the other hand, the hoist may be understood as a device for transmitting the rotational force of the motor shaft for driving the elevator, generally connected directly to the gear shaft and the motor shaft of the geared hoist to rotate the elevator sheave by decelerating the rotation of the motor shaft by the reduction gear. There is a gearless hoist that rotates the sheave. In the present invention, any one selected from the above-described geared hoist and gearless hoist may be easily used as the hoist.

That is, in the present invention, the main body 10 is preferably understood to be a component to which the rotational force transmitted from the hoisting machine is transmitted.

On the other hand, the above-described lifting pulley 20, which is another component of the elevator sheave according to the present invention, is provided in a ring shape having a penetrated center so that the inner circumferential surface of the main body 10 comes into contact with the inner peripheral surface. The outer circumferential surface is provided with a rope receiving groove 21 through which the wire rope is hooked to perform a function of lifting the wire rope.

That is, the above-mentioned lifting pulley 20 is combined with the main body 10 to understand the function of raising or lowering the wire rope connected to the lifting car by using the rotational force transmitted from the hoist to the main body 10. Will be.

On the other hand, as a preferred embodiment of the present invention, one or more protrusions that are discontinuously formed on the outer circumferential surface of the main body 10 described above may be formed, and as a more preferred embodiment, the above-mentioned lifting pulley 20 is the main body It is preferable that the groove corresponding to the protrusion formed in the above-mentioned main body 10 is formed in the inner circumferential surface by being directly injection molded and fastened integrally to the outer circumferential surface of (10).

At this time, the main body 10 described above is an element such as chromium, nickel, manganese, molybdenum, tungsten, etc. for the purpose of improving the properties of steel, which is an alloy of aluminum, iron and carbon having light and durable properties among metals. It may be formed of at least one metal steel of the alloy steel formed by adding one or more and the carbon steel formed of an alloy of iron and carbon, the above-mentioned lifting pulley 20 is 50% or more of a homopolymer of vinyl chloride and vinyl chloride It is one of high strength synthetic resin materials such as PVC (polyvinyl chloride), which is an interpolymer containing, and plastic composite material reinforced with glass and carbon fiber, and FRP (fiber reinforced plastics), which is a lightweight, corrosion-resistant, and highly functional material. In particular, in the present invention, as the material of the above-mentioned lifting pulley 20, by using a synthetic resin material, as well as reducing the manufacturing cost, While maintaining the same strength as in the steel material, yet significantly lighter than steel metal, there can be provided the effect that the service life extending corrosion resistance.

In addition, according to an embodiment of the present invention, the above-described lifting pulley 20 has one or more annular hollow portions 201 along the circumferential direction in one region except for the region in which the protrusion of the main body 10 is coupled. It may be formed.

At this time, it is preferable that the above-mentioned annular hollow portion 201 has a radius of 1/8 to 1/15 of the diameter of the above-mentioned lifting pulley 20, and the above-mentioned diameter range is the lifting pulley 20. Can be understood to be the optimum diameter range that is allowed to efficiently carry out the weight reduction while meeting the strength required to elevate the wire rope connected to the elevating car.

That is, the annular hollow portion 201 described above, as the weight of the lifting pulley 20 is reduced, reduces the overall weight of the elevator sheave, thereby lowering the overall driving force required to rotate the sheave, thereby driving the elevator sheave. There is an effect to reduce the total energy required to.

On the other hand, as another embodiment of the present invention, the above-described lifting pulley 20 may be formed with one or more inlet portion 200 is introduced into the inner region in a predetermined depth along the circumferential direction, at this time The part 200 may be formed in a location area that is isometric in front and rear of the lifting pulley 20.

In this case, the predetermined depth may be understood that the depth introduced into the front and the rear surface is, for example, in a range between 10 and 20% of the total thickness, and the above-described inlet 200 may include the lifting pulley 20. 5 to 8 inlet parts 200 may be formed at 45 ° to 72 ° intervals, and most preferably, 6 inlet parts 200 are provided at 60 ° intervals to the lifting pulley 20. It is preferable to be provided so that the applied rotational force can be uniformly dispersed.

That is, as shown in FIG. 1, the inlet 200 is drawn inward by a predetermined depth, so that the lifting pulley 20 may be understood to exhibit a shape such as a wheel wheel of a vehicle as a whole. , Except for the area where the inlet 200 is formed, acts like a reinforcing rib, thereby reinforcing the strength of the lifting pulley 20 and reducing the weight so that the rotational movement can be efficiently performed.

On the other hand, as a more preferred embodiment of the present invention, the above-described annular hollow portion 201 and the above-mentioned inlet 200 may be formed at the same time, in this case, the center region of the above-described inlet 200 The central region of the annular hollow portion 201 described above may be disposed so that the central region has the same position region.

That is, according to this the inlet portion 200 and the annular hollow portion 201 is formed in the lifting pulley 20 is set to the lifting depth pulley 20 while reinforcing the rigidity required to drive the elevator sieve The weight can be effectively reduced, thereby reducing the driving force required to drive the sheave, thereby achieving energy savings.

Overall, according to an embodiment of the present invention, the thermal expansion coefficient between the components constituting the sheave is different, and as time passes, the coupling structure of the parts is deformed and the main body 10 of the conventional elevator sieve, which has a risk of an accident. By improving the coupling structure of the lifting pulley 20 and there is an effect that can provide an elevator sheave for improved safety.

In addition, according to an embodiment of the present invention, as the lifting portion 200 and the annular hollow portion 201 formed in the lifting pulley 20, the reinforcing rigidity required to drive the elevator sieve is reinforced While reducing the weight of the lifting pulley 20 can be effectively reduced, thereby reducing the driving force required to drive the sheave has the effect of being able to save energy.

Further, according to an embodiment of the present invention, the outer exposed surface of the rope receiving groove 21, that is, the contact surface to which the wire rope is in contact, polyurethane, butyl rubber, polytetrafluoroethylene (( A coating agent composed of a high friction coefficient polymer such as poly (tetrafluoroethylene) and polyamide-imide is applied to prevent the wire rope from slipping, which makes it possible to use it stably and to lift the car. There is an effect that can supplement the driving force required.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention may add components within the scope of the same idea. Other embodiments may be easily proposed by changing, deleting, adding, and the like, but this will also fall within the spirit of the present invention.

2 illustrates an example in which the main body 10 and the lifting pulley 20 are combined according to an embodiment of the present invention, and unnecessary descriptions overlapping with the description of FIG. 1 will be omitted in the following description. .

As mentioned above, the main body 10 and the lifting pulley 20 in the present invention, the lifting pulley 20 is directly injection molded into the outer peripheral surface of the main body 10 is integrally fastened to the main body 10 Grooves corresponding to the formed protrusions 12 may be formed on the inner circumferential surface of the lifting pulley 20.

That is, the elevator sheave of the present invention can be understood that the lifting pulley 20 is provided in the form including the main body 10, wherein, the protrusion 12 of the main body 10 described above is one or more Since the protrusions 12 are discontinuously provided to correspond to the inner circumferential surface of the lifting body, even if the coefficients of thermal expansion are different from each other due to external environmental factors due to extreme climate change, it is difficult to detach easily and accordingly the angles forming the elevator sheave The parts can be abnormally separated to solve the problem of an accident.

That is, according to an embodiment of the present invention, the thermal expansion coefficient between the components constituting the sheave is different, and as time passes, the coupling structure of the parts is deformed and the main body 10 of the conventional elevator sheave, which has a risk of accident By improving the coupling structure of the lifting pulley 20 and there is an effect that can provide an elevator sheave for improved safety.

On the other hand, the above-mentioned lifting pulley 20 may be further provided with at least one of the aforementioned annular hollow portion 201 and the inlet 200.

That is, the annular hollow portion 201 and the inlet portion 200 drawn into the predetermined depth are formed in the elevator sheave to effectively reduce the weight of the lifting pulley 20 while providing the reinforcing force necessary for the entire driving. As it is possible to efficiently reduce the total energy required for driving, most preferably the diameter of the annular hollow portion 201 is formed to the size of 1/10 of the diameter of the lifting pulley 20, the inlet portion described above Depth of the 200 is preferably formed on the front and rear six at an angle of 60 degrees to be arranged on the circumference to provide uniformly distributed rotational force.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention may add components within the scope of the same idea. Other embodiments may be easily proposed by changing, deleting, adding, and the like, but this will also fall within the spirit of the present invention.

3 illustrates an example in which the protrusion 12 is formed on the outer circumferential surface of the main body 10 according to an embodiment of the present invention. In the following description, unnecessary description overlapping with the description of FIGS. 1 and 2 will be omitted. It will be omitted.

Referring to the protrusions 12 formed in the main body 10 in FIG. 3 in more detail, one or more of the protrusions 12 may be discontinuously provided on the outer circumferential surface of the main body 10.

As an example, the protrusion 12 is formed along the outer periphery of the main body 10, it can be understood that it can be formed so that the discontinuous section appears in any section that is not in the form of a continuous ring, the protrusion described above 12 may exist in the form of a ring having one or more discontinuous sections on the outer circumferential surface.

That is, according to this, the lifting pulley is injection-molded on the main body 10 to form one elevator sheave, and further improves the clamping force of the main body 10 made of metal steel and the lifting pulley made of synthetic resin. As a result, even if they have different coefficients of thermal expansion due to extreme external temperature differences, they are not easily separated, thereby eliminating the problems of the prior art.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention may add components within the scope of the same idea. Other embodiments may be easily proposed by changing, deleting, adding, and the like, but this will also fall within the spirit of the present invention.

4 is a view illustrating a comparison of a sieve structure according to an exemplary embodiment of the present invention with a conventional sieve structure, and unnecessary description overlapping with the description of FIGS. 1 to 3 will be omitted in the following description.

Recently, in order to reduce material costs and improve ease of processing, elevator sieves are produced by dualizing the materials of the main body receiving the rotational force from the hoist and the lifting pulley on which the wire rope is wound.

In general, the conventional sheave structure, as shown in 1000 of FIG. 4, the material configuration of the main body and the lifting pulley is provided differently, the coupling of the main body and the lifting pulley shown in 101 is fixed on one side 102 The pair of coupling members provided with the fixing brackets 102 are formed so as to face each other on both sides of the main body to be bonded to each other with the main body therebetween, it consists of a structure that is integrally coupled.

However, such a structure has the advantage that the material cost can be effectively reduced, but when the temperature difference becomes extreme due to external environmental factors including climate change, each material has a different coefficient of thermal expansion and thus constitutes a sheave. There was a problem that the risk of accidents was very high because of the abnormal separation of the bonds.

On the other hand, the elevator sheave of the present invention is provided with a different material configuration of the main body 10 and the lifting pulley 20, as shown in 1100, but the protrusion 12 formed on the outer peripheral surface of the main body 10 discontinuously To form at least one, and by directly injection-molding the lifting pulley 20 to the outer circumferential surface on which the protrusion 12 is formed, to further improve the fastening force of the main body 10 and the lifting pulley 20 to It has its features.
Specifically, as shown in FIG. 4, the protrusion 12 has a width smaller than the width of the outer circumferential surface of the main body 10 so that the protrusion 12 may be located on the outer circumferential surface area of the main body 10 when referring to the cross-sectional view. It is characterized in that it is formed so as not to be disposed at both side ends.
Thus, when the projection 12 is inserted into the groove of the inner circumferential surface of the lifting pulley 20, the rotational direction (see FIGS. 2 and 3, etc.) and the axial deviation (see FIG. 4) through the configuration of the projection 12. There is an effect that can be prevented at once.

That is, it can be understood that the lifting pulley 20 is provided in the form including the main body 10, in which the protrusion 12 of the main body 10 described above is one or more protrusions 12 Since it is continuously provided to correspond to the inner circumferential surface of the lifting body, even if the coefficient of thermal expansion is different from each other due to external environmental factors due to extreme climate change, it is difficult to detach easily, and thus the coefficient of thermal expansion between the components constituting the sheave is different. As time passes, the coupling structure of parts may be modified to improve the coupling structure of the main body 10 and the lifting pulley 20 of the conventional elevator sheave, which may cause an accident, thereby providing an elevator sheave having improved safety. It has an effect.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention may add components within the scope of the same idea. Other embodiments may be easily proposed by changing, deleting, adding, and the like, but this will also fall within the spirit of the present invention.

5 illustrates an example in which a polymer compound is coated on a rope accommodating groove according to an exemplary embodiment of the present invention. In the following description, unnecessary description overlapping with the description of FIGS. 1 to 4 will be omitted.

That is, in Fig. 5 is shown a cross-section of the outer receiving surface of the lifting pulley 20, that is, the rope receiving groove 21 for the wire rope to be walked, in this case, according to an embodiment of the present invention, the rope receiving It can be understood that the groove 21 is coated with a coating agent 211 made of a polymer compound.

In this case, the above-described coating agent 211 may be understood to be a coating agent 211 composed of at least one of polyurethane, butyl rubber, and polyamide-imide. It will be understood that the compound can perform a function that can effectively prevent the wire rope from slipping as the coefficient of friction has a relatively very high value.

More specifically, the above-mentioned polyurethane is a urethane bond made of a combination of an alcohol group and an isocyanic acid group, and is rich in rubber elasticity, has properties such as abrasion resistance, aging resistance, oil resistance, and the like, and particularly has excellent resistance to friction. And slipping can be prevented.

That is, when the coating agent 211 using the above-described polyurethane is coated on the rope receiving groove 21, that is, the contact surface of the wire rope, it is possible to effectively prevent the wire rope from slipping.

In addition, the above-described butyl rubber is a copolymer of isobutylene and isoprene, and the official name is isobutylene isoprene rubber, and elasticity and the like are less than natural rubber, but tensile strength and friction resistance are almost the same, and they are good for climate change. It has high durability and especially high coefficient of friction and is used for tire tubes and the like as industrial building materials.

That is, the above-described butyl rubber is very resistant to climate change, has a high coefficient of friction, and is less likely to be deformed, thereby effectively preventing slipping of the wire rope.

In addition, the aforementioned polyamideimide is a thermosetting or thermoplastic amorphous polymer compound, which is classified as an engineering plastic having excellent friction, thermal and chemical resistance, and has a short-term use temperature of 300 ° C. for several hours, and a long-term use temperature. Is resistant to 220 ℃ for many years.

That is, since the wire rope is excellent in resistance to friction and heat, the wire rope can be suitably used as the coating agent 211 in the rope receiving groove 21 of the lifting pulley 20 in carrying out the repeated lifting movement. will be.

In other words, according to one embodiment of the present invention, the coating agent 211 made of a high friction coefficient polymer is applied to effectively prevent the wire rope from slipping, thereby raising and lowering the car more stably. It can be effected.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention may add components within the scope of the same idea. Other embodiments may be easily proposed by changing, deleting, adding, and the like, but this will also fall within the spirit of the present invention.

In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meanings as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (5)

In an elevator sheave,
A main body having a coupling hole fitted to the driving shaft of the hoisting machine for transmitting rotational power, and having a rotational movement in a predetermined direction as the driving shaft is driven; And
Is provided in a ring (ring) coupled to the inner circumferential surface is in contact with the outer circumferential surface of the main body, the outer circumferential surface is provided with a rope receiving groove for the wire rope to hang the lifting pulley for lifting the wire rope; ,
One or more protrusions are formed on the outer circumferential surface of the main body to be disposed discontinuously and have a width smaller than the width of the outer circumferential surface of the main body so as to be disposed inside the outer circumferential surface of the main body.
The lifting pulley is directly injection molded into the outer circumferential surface of the main body to be integrally fastened so that a groove corresponding to the protrusion is formed on the inner circumferential surface,
One or more annular hollow portions formed in a diameter range of 1/8 to 15 of the diameter of the lifting pulley in a circumferential direction in one region of the inner region of the lifting pulley except for the region to which the protrusion of the main body is coupled. ; And
The front and rear sides of the lifting pulley are formed to be drawn in a depth of 10% to 20% of the entire thickness of the lifting pulley, and 5 to 8 at a position interval of 45 ° to 72 ° from the center of the lifting pulley. Includes; the inlet is formed,
On the outer exposed surface of the rope receiving groove,
As a means for preventing the wire rope from slipping, a coating agent composed of at least one polymer compound of polyurethane, butyl rubber, and polyamide-imide is coated. Sheave for elevator.
The method of claim 1,
The main body is provided with at least one metal material of aluminum, alloy steel, and carbon steel,
The lifting pulley, sheave for the elevator, characterized in that provided with a synthetic resin material.
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