Elevator pulley bushing, elevator pulley assembly, and elevator system

Abstract

The invention discloses an elevator pulley bushing, an elevator pulley assembly and an elevator system. The elevator pulley bushing is mounted in a groove of an elevator pulley and has a first end and a second end opposite to each other, the first end being provided with an engagement portion for engagement with an elevator tensioning member, the elevator pulley bushing comprising: a first section, the first section is arranged on at least one side of the elevator pulley bushing and abuts against the surface of the groove after the elevator pulley bushing is installed in place, a first angle is formed between the first section and the longitudinal center line of the elevator pulley bushing, and the first angle is set to be not larger than arctan (mu1); wherein [mu] 1 is a coefficient of friction between the elevator pulley bushing and the groove. By the adoption of the scheme, the elevator pulley bush can be effectively prevented from sliding or falling off from the elevator pulley, and the safety performance of an elevator system is enhanced.

Description

Technical Field

[0001] This disclosure relates to the field of elevator technology, and more specifically, to elevator pulley bushings, elevator pulley assemblies, and elevator systems. Background Technology

[0002] Elevator systems typically include power units such as traction machines and winches to provide power for system operation. When elevator pulleys (such as traction pulleys) are driven to rotate, the power is transmitted to the elevator tensioning components mounted on the pulleys, causing the latter to move. This, in turn, moves the elevator car and / or counterweight connected to the elevator tensioning components along the elevator shaft. Typically, elevator pulleys are fitted with bushings to increase friction, reduce wear between components, and extend component lifespan. This application's research has found that existing elevator pulley bushings require improvement in terms of structure, performance, installation and replacement maintenance, and manufacturing costs. Summary of the Invention

[0003] In view of this, the present disclosure provides elevator pulley bushings, elevator pulley assemblies and elevator systems to solve or at least alleviate one or more of the above-mentioned problems and other problems existing in the prior art, or to provide alternative solutions to the prior art.

[0004] First, according to one aspect of this disclosure, an elevator pulley bushing is provided, the elevator pulley bushing being installed in a groove of an elevator pulley and having a first end and a second end opposite to each other, the first end being provided with a engagement portion for engaging with an elevator tensioning component, the elevator pulley bushing comprising:

[0005] A first section is disposed on at least one side of the elevator pulley bushing and abuts against the surface of the groove after the elevator pulley bushing is installed in place. A first angle is formed between the first section and the longitudinal centerline of the elevator pulley bushing. The first angle is set to be no greater than arctan(μ1), where μ1 is the coefficient of friction between the elevator pulley bushing and the groove.

[0006] Optionally, in the elevator pulley bushing according to the present disclosure, the elevator pulley bushing further includes a second section connected to the first section and closer to the second end and the longitudinal centerline relative to the first section, the second section forming a second angle with the longitudinal centerline, the second angle being not less than the first angle.

[0007] In the elevator pulley bushing according to the present disclosure, optionally, after the elevator pulley bushing is installed in place, a gap is maintained between the second section and the surface of the groove, and / or the outer surface of the second section is configured as a plane, a wavy plane and / or an arc surface.

[0008] In the elevator pulley bushing according to this disclosure, the gap may optionally range from 0.1 to 2 mm.

[0009] In the elevator pulley bushing according to this disclosure, the second angle may optionally range from 0.5×arctan(μ1) to 90°.

[0010] Optionally, in the elevator pulley bushing according to the present disclosure, the elevator pulley bushing further includes a third section disposed at the second end and connected to the second section, wherein after the elevator pulley bushing is installed in place, a gap is maintained between the third section and the bottom of the groove.

[0011] In the elevator pulley bushing according to the present disclosure, optionally, the first angle ranges from 2.3° to arctan(μ1), and / or the outer surface of the first section is configured as a plane, a wavy plane, and / or an arc surface.

[0012] In the elevator pulley bushing according to the present disclosure, optionally, the joint is configured as a recess to receive the elevator tensioning member, and the recess has protrusions on both sides, the groove having a mounting portion, wherein when the elevator pulley bushing is installed, the protrusions abut against the mounting portion so that the elevator pulley bushing is installed in the groove.

[0013] In the elevator pulley bushing according to this disclosure, optionally, the elevator pulley bushing is configured such that F2 obtained according to the following equation is not less than F1:

[0014]

[0015]

[0016] Wherein, θ is the undercut angle of the groove, γ is the included angle formed by the intersection of the two sides of the groove after they extend, and μ2 is the coefficient of friction between the elevator pulley bushing and the elevator tensioning component.

[0017] In the elevator pulley bushing according to the present disclosure, optionally, the elevator pulley bushing is integrally manufactured and installed in the groove, or the elevator pulley bushing is configured to include two or more combinable parts, which are assembled and installed in the groove.

[0018] In the elevator pulley bushing according to this disclosure, optionally, the joint between two adjacent portions of the combinable portion is constructed in a stepped shape, an arc shape, or a diagonal shape, wherein the angle formed between the diagonal and the longitudinal section of the elevator pulley is less than 90° and not less than 10°.

[0019] Secondly, according to another aspect of this disclosure, an elevator pulley assembly is also provided, comprising:

[0020] Elevator pulleys, which have one or more grooves along their circumference; and

[0021] One or more elevator pulley bushings as described in any of the above, wherein each of the elevator pulley bushings is correspondingly installed in one of the grooves.

[0022] Furthermore, according to another aspect of this disclosure, an elevator system is further provided, comprising:

[0023] A power unit, configured to provide power;

[0024] An elevator car, which operates between elevator floors under the action of said power; and

[0025] An elevator tensioning component and an elevator pulley assembly as described in any of the above, wherein the elevator pulley is connected to the power output end of the power unit, and the elevator tensioning component engages with the joint of the elevator pulley bushing and is connected to the elevator car to transmit the power to the elevator car.

[0026] In the elevator system according to this disclosure, the power unit may optionally include a traction machine and a winch, and / or the elevator tensioning component may include a steel belt and a rope.

[0027] By employing a structurally optimized design, this disclosure effectively prevents the elevator pulley bushing from slipping, loosening, or falling off the elevator pulley, thereby solving problems such as increased friction loss and further wear caused by the movement of the elevator pulley bushing, and significantly enhancing the safety performance of the elevator system. Compared with existing technologies, the elevator pulley bushing and the groove structure of the elevator pulley in this disclosure are easier to process, requiring less time for manufacturing and installation, and the installation operation is simple and convenient, which can significantly reduce the workload of on-site personnel and lower the overall cost. Attached Figure Description

[0028] The technical solutions of this disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are intended to conceptually illustrate the structural construction described herein, and are not necessarily drawn to scale.

[0029] Figure 1 This is a three-dimensional structural schematic diagram of an example elevator system that can be adopted according to various embodiments of the present disclosure.

[0030] Figure 2 This is a schematic side cross-sectional view of an embodiment of an elevator pulley bushing according to the present disclosure, and also shows a partial side cross-sectional view of an example of an elevator tensioning component and an example of an elevator pulley.

[0031] Figure 3 This is a schematic diagram showing the relationship between the self-locking angle and the coefficient of friction μ1 of another embodiment of the elevator pulley bushing according to this disclosure.

[0032] Figure 4 This is yet another schematic diagram of the structural stress analysis of an elevator pulley bushing embodiment and an example elevator pulley in use, according to the present disclosure.

[0033] Figure 5 This is a three-dimensional structural schematic diagram of another embodiment of the elevator pulley bushing installed on an example of an elevator pulley according to the present disclosure.

[0034] Figure 6 The diagram shows partial top views of four different embodiments of the elevator pulley bushing according to the present disclosure, respectively installed on an elevator pulley example. Detailed Implementation

[0035] Figure 1 This is a perspective view of an elevator system 100, which may include an elevator car 103, a counterweight 105, a tensioning member 107, guide rails (or track system) 109, a machine unit (or machine unit system) 111, a position reference system 113, and an electronic elevator controller (controller) 115. The elevator car 103 and the counterweight 105 are connected to each other via the tensioning member 107. The tensioning member 107 may include or be configured as, for example, a steel belt (such as a coated steel belt) and / or ropes (such as wire ropes). The counterweight 105 may be configured to balance the load of the elevator car 103 and may be configured to facilitate simultaneous and opposite movement of the elevator car 103 relative to the counterweight 105 within the elevator shaft 117 and along the guide rails 109.

[0036] Tensioning component 107 engages unit 111, which is part of the overhead structure of elevator system 100. Unit 111 can be configured to control movement between elevator car 103 and counterweight 105. Position reference system 113 can be mounted on a fixed portion at the top of elevator shaft 117, such as on a support rod or guide rail, and can be configured to provide a position signal relating to the position of elevator car 103 within elevator shaft 117. In other embodiments, position reference system 113 can be directly mounted to a moving component of unit 111, or can be located in other locations and / or configurations as known in the art. Position reference system 113 can be any device or mechanism known in the art for monitoring the position of elevator car and / or counterweight. For example, but not limited to, position reference system 113 can be an encoder, sensor, or other system, and can include speed sensing, absolute position sensing, etc., as those skilled in the art will understand.

[0037] like Figure 1 As shown, controller 115 may be located in controller room 121 of elevator shaft 117 and may be configured to control the operation of elevator system 100 (and particularly elevator car 103). For example, controller 115 may provide drive signals to unit 111 to control the acceleration, deceleration, leveling, stopping, etc. of elevator car 103. Controller 115 may also be configured to receive position signals from position reference system 113 or any other desired position reference device. When moving up or down along guide rail 109 within elevator shaft 117, elevator car 103 may stop at one or more elevator landings 125 as controlled by controller 115, at which time passengers may enter or exit elevator car 103 through open elevator landing doors. Although controller 115 is shown in controller room 121, those skilled in the art will appreciate that controller 115 may be located and / or configured in other places or locations within elevator system 100. In one embodiment, the controller may be remotely located or located in the cloud.

[0038] Unit 111 may include a motor or similar power unit to provide operating power to elevator system 100. Such elevator power units are often referred to as traction machines, winches, etc. in practical applications. According to embodiments of this disclosure, unit 111 may be configured to include an electrically driven motor. The power source for the motor can be any possible power source, such as the power grid, which may be combined with other components to supply power to the motor. Unit 111 may include, for example, an elevator pulley 20 serving as a traction pulley, through which force can be transmitted to tensioning member 107 to move elevator car 103 within elevator shaft 117 to reach the desired elevator floor 125.

[0039] This document shows and describes specific elevators and specific components. Figure 1 These are non-limiting examples presented merely for illustrative and explanatory purposes. It should be recognized that other elevator systems may be configured to use the elevator pulley bushings and elevator pulley assemblies disclosed herein. Furthermore, for the sake of simplicity in the drawings, identical or similar parts and features may be indicated only in one or more places in the same drawing. Technical terms such as "first," "second," etc., are used only for distinguishing purposes and are not intended to indicate their order or relative importance. The technical term "connection (or engagement)" includes connections (or engagements) achieved directly or indirectly.

[0040] As used herein, in various embodiments, for example Figure 2As shown, one or more grooves 21 can be provided on the elevator pulley 20 as needed. The grooves 21 can be arranged around the circumference of the elevator pulley 20, and the elevator pulley bushing 10 is correspondingly configured into the grooves 21 to increase friction, reduce component wear, reduce vibration, and extend service life. The elevator pulley bushing 10 can especially achieve a self-locking anti-slip function. The elevator pulley bushing 10 can generally be made of a suitable non-metallic material such as rubber. It is constructed with opposing ends 10a and 10b, wherein a joint 14 can be provided at the end 10a for engaging with the tensioning member 107. For example, the joint 14 can be constructed with a recessed structure to accommodate the tensioning member 107 during use. The tensioning member 107 contacts the elevator pulley bushing 10 and, under the power transmitted from the unit 111 by the elevator pulley 20, will drive the elevator car 103 along the guide rail 109 to reach the target floor.

[0041] The elevator pulley bushing 10 may be provided with a first section 11, a second section 12, and a third section 13. The first section 11 can be located on both sides of the elevator pulley bushing 10, and the second section 12 can also be located on both sides of the elevator pulley bushing 10 and connected to the first section 11. The second section 12 is closer to the longitudinal centerline L and end 10b of the elevator pulley bushing 10 than the first section 11. The third section 13 is arranged at the end 10b to connect the second section 12 located on both sides of the elevator pulley bushing. The third section 13 can be constructed as needed to have a horizontal, arc, or any other suitable configuration. Generally, the longitudinal centerline L of the elevator pulley bushing 10 is perpendicular to the rotation axis of the elevator pulley 20. As used herein, in various embodiments, for example, by constructing protrusions 15 on both sides of the joint 14 on the elevator pulley bushing 10, the above protrusions 15 may abut against the mounting portion 22 of the groove 21 of the elevator pulley 20 when the elevator pulley bushing 10 is installed, thereby securely mounting the elevator pulley bushing 10 onto the elevator pulley 20.

[0042] After the elevator pulley bushing 10 is positioned on the elevator pulley 20, as used herein, in various embodiments, the first section 11 will abut against the surface of the groove 21, and the first section 11 will form an angle α with the longitudinal centerline L. According to the technical solution of this disclosure, when the above-mentioned angle α is set to be less than or equal to arctan(μ1) (μ1 is the coefficient of friction between the elevator pulley bushing 10 and the groove 21), for example, when the selection range of angle α is set to 2.3° to arctan(μ1), then the elevator pulley bushing 10 can be kept in its current position and is less likely to slip, loosen or fall off the elevator pulley 20, thereby effectively avoiding adverse consequences caused by the above problems, such as increased friction loss and vibration, more wear, and affecting the safe operation of the elevator.

[0043] As an example, in Figure 3 The figure schematically illustrates the relationship between the self-locking angle and the coefficient of friction μ1 in an embodiment of an elevator pulley bushing. The horizontal axis represents the coefficient of friction μ1 between the elevator pulley bushing and the groove of the elevator pulley, and the vertical axis represents the calculated arctangent function value of μ1, i.e., arctan(μ1). Along... Figure 3 The curve shown divides the graph into two regions: an upper non-locking region and a lower locking region. When the angle α of the first segment of the elevator pulley bushing is designed to be located within the lower locking region corresponding to the current μ1, the elevator pulley bushing can maintain a self-locking state on the elevator pulley 20, thus reducing the likelihood of slippage, loosening, or falling off. For example, when μ1 = 0.25, then α = 14.04°. In this case, the angle α of the first segment can be designed to be no greater than 14.04° so that the elevator pulley bushing tends to remain self-locked in its current position after being installed on the elevator pulley 20.

[0044] As used herein, in various embodiments, for example Figure 2 As shown, the second section 12 of the elevator pulley bushing 10 can be configured to form an angle β with the longitudinal centerline L. The angle β is generally greater than or equal to the aforementioned angle α, thereby preventing relative sliding of the elevator pulley bushing 10. Alternatively, the angle β can be set to a range of 0.5×arctan(μ1)~90°. In this case, the second section 12 is closer to the longitudinal centerline L of the elevator pulley bushing 10 than the first section 11. That is, the elevator pulley bushing 10 presents a configuration that gradually tapers from end 10a to end 10b, which makes processing and loading / unloading operations easier.

[0045] As used herein, in various embodiments, the second section 12 may optionally be configured such that, after the elevator pulley bushing 10 is installed, the second section 12 maintains a gap P1 between itself and the surface of the groove 21, and / or the third section 13 maintains a gap P2 between itself and the bottom of the groove 21. The specific values ​​of these gaps P1 and P2 can be flexibly set according to actual application requirements; for example, P1 may be set in the range of 0.1-2 mm, and P2 may be set in the range of no more than 1 mm, etc. This disclosure does not impose any limitations in this regard.

[0046] By adopting the above structural design, the elevator pulley bushing 10 has a tendency to move downward during use, that is, to move towards the bottom of the groove 21. This can effectively prevent the elevator pulley bushing 10 from sliding off, loosening or falling off the elevator pulley 20, and ensure that the elevator pulley bushing 10 can maintain full contact with the groove 21 continuously. This ensures and enhances the close contact between the elevator pulley bushing 10 and the elevator pulley 20 and the tensioning component 107, thereby enabling long-term stable operation.

[0047] By combining the angle α of the first section 11 and the angle β of the second section 12, the self-locking and anti-slip functions of the elevator pulley bushing 10 can be better realized. Moreover, compared with existing technical solutions, such as the dovetail groove structure commonly used in elevator pulleys, this elevator pulley bushing and the matching elevator pulley groove have advantages such as easy processing and manufacturing, installation and disassembly maintenance, and stable working performance.

[0048] As used herein, in various embodiments, the elevator pulley bushing 10 can adopt a symmetrical design. Of course, in one or more embodiments, the elevator pulley bushing 10 can also adopt an asymmetrical design, such as providing a first segment only on one side of the elevator pulley bushing 10, or providing two asymmetrical first segments on each side, for example, using angles α of different sizes. Furthermore, in one or more embodiments, the second segment 12 and / or the third segment 13 can be removed as needed. Additionally, it should be understood that the surfaces of the first segment 11 and the second segment 12 facing the groove 21 can be configured as flat, wavy, and / or curved surfaces as required, and the groove 21 can optionally have a matching configuration. In cases where the first segment 11 and / or the second segment 12 may have relatively complex surfaces, such relatively complex surfaces can be equivalently treated as basic flat surfaces. For example, the angle of each flat segment in the wavy plane can be set to conform to the corresponding design of this disclosure regarding angle α or angle β. Alternatively, the curved surface can be approximated as several wavy planes before the angle design is performed in the above manner.

[0049] Continue to refer to Figure 4 The figure shown is merely an illustrative illustration of the stress conditions based on an example elevator pulley structure, which is used in conjunction with an elevator pulley bushing embodiment according to this disclosure. The elevator pulley bushing 10 can be optimized according to the following two equations:

[0050]

[0051]

[0052] In the above equations, F1 is the frictional force between the tensioning component 107 and the elevator pulley bushing 10, F2 is the frictional force between the elevator pulley bushing 10 and the groove 21, μ1 is the coefficient of friction between the elevator pulley bushing 10 and the groove 21, μ2 is the coefficient of friction between the tensioning component 107 and the elevator pulley bushing 10, θ is the undercut angle of the groove 21, and γ is the included angle formed by the intersection of the two sides of the groove 21 after they extend.

[0053] By optimizing the selection of materials used for the elevator pulley bushing, elevator pulley, and tensioning component (i.e., selecting design μ1 and μ2) as well as β and γ, it is possible to achieve F2 not less than F1. That is, the frictional force between the elevator pulley bushing 10 and the groove 21 will be greater than or equal to the frictional force between the elevator pulley bushing 10 and the tensioning component 107. Therefore, it will not or is not easy for the elevator pulley bushing to slip off the elevator pulley 20, loosen, or fall off.

[0054] In one or more embodiments, the elevator pulley bushing 10 can be integrally manufactured (e.g., using injection molding) and then integrally installed into the groove 21 of the elevator pulley 20. However, in another or some embodiments, the elevator pulley bushing 10 can be comprised of two or more combinable parts as needed, and these combinable parts can be assembled and installed into the groove 21 of the elevator pulley 20 during use. Figure 5 and Figure 6 Such combinable parts are schematically indicated using reference numeral 16 in the accompanying drawings. Similarly, the elevator pulley 20 can have an integrated structure or a modular assembly structure, and it can be manufactured using suitable processes such as integral casting or machining. Furthermore, as an option, a separately configured metal part can be detachably installed on the body of the elevator pulley 20 to serve as a groove for mating with the elevator pulley bushing 10. In this way, even in the extreme case where the elevator pulley bushing 10 is completely worn out, the aforementioned metal part structure can still bear the system's traction force, and the damaged elevator pulley bushing 10 can be replaced at an appropriate time. This helps reduce system downtime, lowers overall service costs, extends the service life of elevator tensioning components and other parts, and significantly enhances the safety performance of the elevator system.

[0055] exist Figure 5 The embodiments shown are merely illustrative examples illustrating that the elevator pulley bushing 10 may have several combinable sections 16, which may have the same or different structural configurations in terms of circumferential length, edge profile, material, and color selection. For example, two adjacent combinable sections 16 of the elevator pulley bushing 10 can be configured into any suitable shape at the assembled seam 17, for example, in... Figure 6 The diagrams show various seam configurations, including diagonal lines, stepped shapes, and arc shapes. Figure 6 (a) and Figure 6 (b) also shows that such diagonal lines can have different inclination directions relative to the axis of the elevator pulley 20. For example, as an alternative, the diagonal lines can be configured such that the included angle δ between them and the longitudinal section of the elevator pulley 20 is greater than or equal to 10° and less than 90°. When the joint 17 between two adjacent combinable parts 16 has a joint configuration that is not parallel to the axis of the elevator pulley 20, this allows for a contact time difference between the tensioning member 107 and different joint locations, thus effectively reducing or avoiding adverse effects such as vibration and noise that may be caused when the tensioning member 107 contacts the joint 17.

[0056] It should be understood that this disclosure allows for flexible configuration according to actual application needs regarding the specific number of combinable parts 16 in the elevator pulley bushing 10, the configuration of individual combinable parts, and the matching settings between combinable parts, without imposing any restrictions.

[0057] According to this disclosure, an elevator pulley assembly is also provided, comprising an elevator pulley and one or more elevator pulley bushings according to this disclosure correspondingly arranged in the groove of the elevator pulley. Because the elevator pulley bushings have significant advantages as described above, such as self-locking anti-slip, ease of manufacturing, convenient assembly and maintenance, low application cost, and high reliability, this elevator pulley assembly is very suitable for widespread application in many types of elevator systems. This is of considerable positive significance for ensuring the long-term stable operation of elevator systems and improving system safety performance.

[0058] The above examples are merely illustrative of the elevator pulley bushing, elevator pulley assembly, and elevator system according to this disclosure. These examples are for illustrating the principles and implementation methods of this disclosure only, and are not intended to limit the disclosure. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of this disclosure. Therefore, all equivalent technical solutions should fall within the scope of this disclosure and be defined by the claims of this disclosure.

Claims

1. An elevator pulley bushing, characterized in that, The elevator pulley bushing is installed in the groove of the elevator pulley and has a first end and a second end opposite to each other. The first end is provided with a joint for engaging with the elevator tensioning component. The elevator pulley bushing includes: A first section is disposed on at least one side of the elevator pulley bushing and abuts against the surface of the groove after the elevator pulley bushing is installed in place. A first angle is formed between the first section and the longitudinal centerline of the elevator pulley bushing. The first angle is set to be no greater than arctan(μ1), where μ1 is the coefficient of friction between the elevator pulley bushing and the groove.

2. The elevator pulley bushing according to claim 1, wherein, The elevator pulley bushing also includes a second section, which is connected to the first section and is closer to the second end and the longitudinal center line than the first section. The second section and the longitudinal center line form a second angle, which is not less than the first angle.

3. The elevator pulley bushing according to claim 2, wherein, After the elevator pulley bushing is installed in place, a gap is maintained between the second section and the surface of the groove, and / or the outer surface of the second section is configured as a plane, a wavy plane, and / or an arc surface.

4. The elevator pulley bushing according to claim 3, wherein, The gap ranges from 0.1 to 2 millimeters.

5. The elevator pulley bushing according to claim 2, wherein, The second angle ranges from 0.5×arctan(μ1) to 90°.

6. The elevator pulley bushing according to claim 2, wherein, The elevator pulley bushing also includes a third section, which is disposed at the second end and connected to the second section. After the elevator pulley bushing is installed in place, a gap is maintained between the third section and the bottom of the groove.

7. The elevator pulley bushing according to claim 1, wherein, The first angle ranges from 2.3° to arctan(μ1), and / or the outer surface of the first segment is constructed as a plane, a wavy plane, and / or an arc surface.

8. The elevator pulley bushing according to claim 1, wherein, The joint is configured as a recess to accommodate the elevator tensioning component, and the recess has protrusions on both sides. The groove has a mounting portion, and when the elevator pulley bushing is installed, the protrusions abut against the mounting portion so that the elevator pulley bushing is installed in the groove.

9. The elevator pulley bushing according to claim 1, wherein, The elevator pulley bushing is configured such that F2, obtained according to the following equation, is not less than F1: Wherein, θ is the undercut angle of the groove, γ is the included angle formed by the intersection of the two sides of the groove after they extend, and μ2 is the coefficient of friction between the elevator pulley bushing and the elevator tensioning component.

10. The elevator pulley bushing according to claim 1, wherein, The elevator pulley bushing is integrally manufactured and installed in the groove, or the elevator pulley bushing is configured to include two or more combinable parts, which are assembled and installed in the groove.

11. The elevator pulley bushing according to claim 10, wherein, The joint between two adjacent parts in the combinable portion is constructed in a stepped shape, an arc shape, or a diagonal shape, wherein the angle formed between the diagonal line and the longitudinal section of the elevator pulley is less than 90° and not less than 10°.

12. An elevator pulley assembly, characterized in that, include: An elevator pulley, which has one or more grooves along its circumference; as well as One or more elevator pulley bushings as described in any one of claims 1-11, wherein each of the elevator pulley bushings is correspondingly installed in one of the grooves.

13. An elevator system, characterized in that, include: A power unit, configured to provide power; An elevator car that moves between elevator floors under the action of the power described above; as well as An elevator tensioning component and an elevator pulley assembly as claimed in claim 12, wherein the elevator pulley is connected to the power output end of the power unit, the elevator tensioning component engages with the joint of the elevator pulley bushing and is connected to the elevator car to transmit the power to the elevator car.

14. The elevator system according to claim 13, wherein, The power unit includes a traction machine and a winch, and / or the elevator tensioning component includes a steel belt and a rope.

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