Patent Description:
An elevator is a transport tool frequently used in daily life. However, because of a special use scenario of an elevator, the elevator needs maintenance for a long period, and aged or worn parts need to be replaced at an appropriate time, so as to ensure safety of application of the elevator. At present, according to usage of an elevator, a pulley component of the elevator is generally replaced about every <NUM> years. However, it is found in actual maintenance processes that it is very difficult to maintain and replace a pulley component at a site of mounting and using an elevator. After a maintenance person turns off an elevator, a conveyor belt or a conveyor rope tensioned on a traction sheave of a pulley component still needs to be completely pulled away. Throughout a process of maintaining and replacing a traction sheave, such an action of pulling away the conveyor belt or the conveyor rope needs to be kept, and after replacement of the traction sheave is completed, the conveyor belt is tensioned on the traction sheave again. Moreover, throughout a process of maintenance, a conveyor belt needs to be taken off first, and is mounted again after the maintenance is completed. Therefore, regardless of which manner is used, this replacement process consumes a large amount of human and material resources. Meanwhile, the process further has a high cost of time, resulting in that a user needs to wait for a long time, which reduces user experience.

To improve such a condition, experts in the field also propose a concept of changing a complete traction sheave into multiple sections to overcome the foregoing problem. However, to apply such a concept to an actual scenario, multiple issues further need to be considered. For example, an issue is how to connect these sections to facilitate replacement of the sections without affecting normal working of a traction sheave. For another example, an issue is how to design angles and perimeters of these sections to achieve the foregoing effect. <CIT> shows an elevator drive sheave comprising a cylindrical sheave main body and arc shaped divided segments that are each fixed to the sheave body by radial bolts (<NUM>,<NUM>), and by axial bolts (<NUM>).

An objective of the present invention is to provide a traction sheave that has higher efficiency and can keep its own structural reliability when maintenance and replacement are required.

An objective of the present utility model is further to provide a pulley component that can adapt to the traction sheave according to the present utility model, thereby facilitating maintenance.

An objective of the present utility model is further to provide an elevator that has the pulley component of the present utility model, thereby facilitating maintenance.

To achieve the foregoing objectives or other objectives, the present utility model provides the following technical solutions.

According to an aspect of the present utility model, a traction sheave is provided, including: a traction sheave body, formed of several arc-shaped traction sheave sections that are connected to each other; and connecting portions, disposed at two ends of each traction sheave section along a lateral surface of the traction sheave section, wherein the connecting portions at the two ends of each traction sheave section fit each other.

According to another aspect of the present utility model, a pulley component is further provided, including: the foregoing traction sheave; a pulley, including a pulley body and a shaft located on a side of the pulley body, the traction sheave being sleeved over the shaft of the pulley; and a conveyor belt, tensioned with a part of the traction sheave.

According to still another aspect of the present utility model, an elevator is further provided, including: the foregoing pulley component.

Referring to <FIG> and <FIG>, a first embodiment of a traction sheave of the present utility model is shown. A traction sheave <NUM> in <FIG> and <FIG> includes a traction sheave body, having a basically circular outline, a conveyor belt groove <NUM> being disposed on an outer-circumference of the traction sheave body, to implement engagement with a conveyor belt, thereby achieving an effect of torque transfer. In this embodiment, the traction sheave body is formed of two arc-shaped traction sheave sections <NUM>, <NUM>'. Connecting lugs <NUM>, <NUM>' are disposed respectively at two ends of each traction sheave section <NUM>, <NUM>'. The connecting portions <NUM>, <NUM>' may be respectively placed on two opposite lateral surfaces of the traction sheave sections <NUM>, <NUM>', so that two sides of the traction sheave sections <NUM>, <NUM>' fit each other, so as to connect the traction sheave sections <NUM>, <NUM>' into a complete traction sheave body.

Specifically, the connecting lugs <NUM> are respectively located on edges of two end portions of the traction sheave section <NUM>. In an aspect, the connecting lugs <NUM> extend upwards/downwards perpendicular to lateral surfaces on two sides of the traction sheave section <NUM>. In another aspect, a first end <NUM> of the connecting lug <NUM> extends inwards in a horizontal direction to be flush with an inner circumference <NUM> of the traction sheave section <NUM>. A second end <NUM> of the connecting lug <NUM> extends outwards to protrude from an outer circumference <NUM> of the traction sheave section <NUM>, so as to form a rectangular sheet-form structure. A first connecting hole <NUM> for providing stable connection is provided on a side, away from the traction sheave section <NUM>, of the rectangular sheet-form second end <NUM> of the connecting lug <NUM>. The other connecting lug <NUM>' also has the foregoing structure. Therefore, during assembly, the connecting lugs <NUM> at two ends of the traction sheave section <NUM> may be respectively aligned with the connecting lugs <NUM>' at two ends of the traction sheave section <NUM>', and first connecting bolts <NUM> pass through corresponding connecting holes <NUM>, <NUM>' to achieve an effect of fastening the traction sheave sections <NUM>, <NUM>'. Fastening of a traction sheave section in a circumferential direction is actually implemented.

In addition, second connecting holes <NUM> and positioning holes <NUM> are further disposed on the lateral surfaces of the traction sheave section <NUM>. The second connecting holes <NUM> are uniformly provided near the inner circumference <NUM> of the traction sheave section <NUM>, so as to provide reliable connection between the traction sheave section <NUM> and a pulley body. The positioning holes <NUM> similarly are uniformly provided near the inner circumference <NUM> of the traction sheave section <NUM>, so as to implement reliable relative positioning between the traction sheave section <NUM> and the pulley body. The foregoing arrangement also exists in the traction sheave section <NUM>'. Fastening in an axial direction of a traction sheave section is actually implemented. This is further described below with reference to an embodiment of the pulley component of the present utility model.

Still referring to <FIG>, the traction sheave <NUM> in this embodiment further includes a flange <NUM> on a side of the traction sheave <NUM>. The flange <NUM> protrudes inwards along the entire inner circumferences <NUM> of the traction sheave sections <NUM>, <NUM>', so as to provide position limiting of the traction sheave sections <NUM>, <NUM>' relative to a shaft of the pulley component. In this case, the second connecting holes <NUM> may be disposed on the flange, to implement reliable relative positioning between the traction sheave section <NUM> and the pulley body.

Although an embodiment of the present utility model is described above with reference to <FIG> and <FIG>, a person skilled in the art should know that several technical measures in the embodiment have multiple alternative implementation manners, and therefore, the protection scope of this application should be considered based on the appended claims, and is not limited to this single embodiment.

Multiple alternative embodiments of the traction sheave section are further provided herein for reference.

Optionally, the traction sheave body in the foregoing embodiment is formed of two traction sheave sections <NUM>, <NUM>' that are connected. However, this is considered and designed mainly to improve the working reliability of a traction sheave. When reliability requirement in an actual application environment is relatively low, the traction sheave body may also be designed to be formed of more than two traction sheave sections, and an effect of facilitating replacement and maintenance that is needed by the present utility model can also be achieved.

Optionally, in the foregoing embodiment, the two traction sheave sections <NUM> that form the traction sheave body are completely symmetrical. However, this is considered mainly to facilitate processing and molding and improve universality of parts. For example, in this case, traction sheave sections in only one structural form need to be fabricated. When any traction sheave section is worn, a same part may be used for replacement. Based on the same consideration, when the traction sheave body is formed of multiple traction sheave sections <NUM>, each section may also be completely symmetrical. Meanwhile, when this aspect does not need to be considered, two traction sheave sections or several traction sheave sections of the traction sheave body may not use an identical structural form. For example, the traction sheave sections may have different angles or different arc lengths.

In addition, to facilitate assembly and disassembly, a further structural design requirement may further be imposed for the traction sheave section of the present utility model.

For example, when the traction sheave body of the present utility model is formed of two traction sheave sections, an angle of any one traction sheave section may be greater than a first angle, and the first angle is between <NUM>° and <NUM>° in this embodiment. The first angle is designed to mainly avoid friction or collision between the traction sheave section and the conveyor belt in a process of assembling and disassembling the traction sheave section. Therefore, preferably, if an angle of any of traction sheave sections is greater than a wrap angle of the conveyor belt (corresponding to the first angle herein), the foregoing problem can be effectively avoided. Meanwhile, optionally, when a traction sheave is designed to be noncircular based on an application environment of the traction sheave, it is not very suitable to describe a shape of a traction sheave section by using an angle. In this case, it may be designed that an outer-circumferential perimeter of any one of the traction sheave sections is greater than a first length, and a ratio of the first length to a total perimeter of the traction sheave is kept between <NUM> and <NUM>. In this way, friction or collision between the traction sheave section and the conveyor belt can also be avoided.

For another example, when the traction sheave body of the present utility model is formed of more than two traction sheave sections, an angle of any one of the traction sheave sections may be less than a second angle, and the second angle is between <NUM>° and <NUM>°. Meanwhile, optionally, an outer-circumferential perimeter of any one of the traction sheave sections may be less than a second length, and a ratio of the second length to a total perimeter of the traction sheave is between <NUM> and <NUM>. In this way, friction or collision between the traction sheave section and the conveyor belt can also be avoided.

Multiple alternative embodiments of the connecting portion are further provided herein for reference.

Optionally, in the foregoing embodiment, the connecting lug <NUM> is used for connection between the traction sheave sections. However, the foregoing embodiment is relatively a preferred embodiment, and has advantages such as convenient processing and secure connection. Other connection structures may also be used. For example, two connecting portions having wedge-form structures that fit each other, or two connecting portions having buckles that fit each other.

Optionally, to provide a relatively secure connection effect, in the first embodiment of the present utility model, connecting lugs are respectively disposed on both lateral surfaces of a traction sheave section. In an actual application, a connecting lug may also be disposed on only one side of a traction sheave section.

Similarly, an extending length of a connecting lug and a specific design location of a first connecting hole on the connecting lug may also be changed according to an actual case.

Optionally, in the first embodiment of the present utility model, the second connecting holes and/or positioning holes are uniformly disposed in a circumferential direction on lateral surfaces of each traction sheave section. However, in an actual application, the second connecting holes and/or positioning holes may not need to be uniformly disposed in a circumferential direction on the lateral surfaces of each traction sheave section.

In addition, referring to <FIG>, another embodiment of a traction sheave and a pulley component of the present utility model is shown. In this case, a boss <NUM> is disposed along an inner circumference of each traction sheave section <NUM>, and several second connecting holes <NUM> and/or positioning holes (not shown) are disposed in a circumferential direction on a lateral surface of the boss <NUM>. Optionally, these second connecting holes <NUM> and/or positioning holes are uniformly disposed in a circumferential direction on the boss <NUM>.

It should be known that various embodiments of the connecting portion and various embodiments of the traction sheave section that are additionally described above may be arbitrarily combined and applied in the first embodiment described above in detail.

Referring to <FIG>, one embodiment of the pulley component <NUM> of the present utility model is shown. The pulley component has any traction sheave in the foregoing. In addition, to fit such a traction sheave, the pulley component <NUM> further has a pulley. The pulley includes a pulley body <NUM> and a shaft <NUM> located on a side of the pulley body <NUM>. The traction sheave is sleeved over the shaft <NUM> of the pulley. The pulley component further includes a conveyor belt <NUM>. During operation, the conveyor belt <NUM> is tensioned with a part of the traction sheave, and transfers torque along with rotation of the traction sheave.

Because the traction sheave may rotate, any one of the traction sheave sections <NUM> that form the traction sheave and the conveyor belt <NUM> have a contact location and a separate location. As shown in <FIG>, the traction sheave section <NUM> and the conveyor belt <NUM> are at the separate location. In this case, the connecting portion <NUM> may be loosened, and then the traction sheave section <NUM> may be detached. Specific processes of assembly and disassembly are specifically described below.

It should be noted that, after mounting of the pulley component is completed, the conveyor belt <NUM> forms a wrap angle relative to the traction sheave. An angle of any one of the traction sheave sections <NUM> is less than a difference value between <NUM>° and a value of the wrap angle. More specifically, in this embodiment, the wrap angle is between <NUM>° and <NUM>°. As shown in <FIG>, such design enables the traction sheave section <NUM> to be completely removed from a tensioning area between the conveyor belt <NUM> and the traction sheave when the traction sheave section <NUM> rotates by a certain angle, so that in a process of detaching the traction sheave section <NUM>, no collision occurs between the traction sheave section <NUM> and the conveyor belt <NUM>.

Optionally, by using a fastener that passes through a lateral surface of the traction sheave and a lateral surface of the pulley body, the traction sheave and the pulley body may be connected and secured. This connection manner can ensure connection reliability and a securing degree, and causes no inconvenience to a detaching process.

A working process of replacing a worn traction sheave section for the pulley component of the present utility model is described below with reference to <FIG>. First, as shown in <FIG>, the traction sheave section <NUM> is rotated to the separate location where the traction sheave section <NUM> leaves the conveyor belt <NUM>. In this case, no friction or collision occurs between the traction sheave section <NUM> and the conveyor belt. Subsequently, as shown in <FIG>, several first connecting bolts <NUM> are respectively removed from the first connecting hole <NUM> on the connecting lug <NUM>, so that securement between the traction sheave section <NUM> and another traction sheave section is released. Next, as shown in <FIG>, the several second connecting bolts <NUM> are respectively removed from the second connecting holes <NUM> on the traction sheave section <NUM>, so that securement between this traction sheave section <NUM> and the pulley body <NUM> is released. An order of operations that are shown in <FIG> and <FIG> may be changed, which does not affect a maintenance process of the traction sheave of the present utility model. Finally, as shown in <FIG>, after axial-direction securement and circumferential-direction securement of the traction sheave section <NUM> are released, the traction sheave section <NUM> can be removed, and replaced with a new traction sheave section. In this way, a process of replacing a traction sheave section is completed. If another transfer section further needs to be replaced, only a corresponding traction sheave section needs to be rotated to a separate location, and steps shown in <FIG> are repeated.

In an aspect, because in a replacement process, a conveyor belt does not need to be pulled away or removed, a time of replacing a part is greatly reduced, and an amount of work of a maintenance person is reduced. In another aspect, a traction sheave part that needs to be replaced may be determined according to a wear condition, so that as compared with replacement of an entire traction sheave, replacement of a traction sheave section has a lower cost of parts, and at the same time, the entire traction sheave can have reliable performance same as that in the prior art.

It should be known that only a process of replacing a traction sheave that has two traction sheave sections is described above with reference to <FIG>. However, with reference to the description herein, a person skilled in the art may also know how to operate and replace a traction sheave that has multiple traction sheave sections, and details are no longer described herein.

The present utility model further provides an elevator. The traction sheave or the pulley component having the same that is described above is applied in the elevator. Therefore, in a process of maintaining the elevator, a time for maintenance or part replacement can be greatly reduced, costs of human and material resources and time can be reduced, and it can also be avoided that a user waits long and becomes impatient.

Claim 1:
A traction sheave (<NUM>) comprising:
a traction sheave body, formed of several arc-shaped traction sheave sections (<NUM>, <NUM>') that are connected to each other; and any of:
several second connecting holes (<NUM>) and/or connecting portions (<NUM>) disposed in a circumferential direction on the lateral surface of each traction sheave section (<NUM>, <NUM>'); or
a boss (<NUM>) disposed along an inner circumference of each traction sheave section (<NUM>, <NUM>'), and several second connecting holes (<NUM>) and/or positioning holes (<NUM>) disposed in a circumferential direction on a lateral surface of the boss (<NUM>);
the traction sheave (<NUM>) being characterized by first connecting portions, disposed at two ends of each traction sheave section (<NUM>, <NUM>') along a lateral surface of the traction sheave section (<NUM>, <NUM>'),
wherein the connecting portions at the two ends of each traction sheave section (<NUM>, <NUM>') fit each other.