Suspension sheave for elevator having bearing load reduction function

Abstract

The present invention relates to a suspension device for an elevator, wherein the suspension device separates a plurality of integrated fixed pulleys which are installed for secondary traction, as well as an elevator car, so that each pulley can operate separately from adjacent pulleys, and moreover, relates a technique for allowing a bearing enabling the rotation in a towed pulley to have a lifespan suitable for high speed or heavy weight, according to the requirements for high-speed or heavy-weight elevators. To achieve this, the suspension device comprises an attachment shaft, a first bearing member which is provided to be rotatable in the lengthwise direction of the outer circumference of the attachment shaft, a second bearing member of which the inner circumference is installed on the outer circumference of the first bearing member and which is rotatably provided to form a multi-layered structure, and an external pulley which is attached onto the outer circumference of the second bearing member to be independently rotatable, and has an outer circumference around which a connection means is wound.

Description

Suspended sheave for elevators with load reduction function on bearings

[0001] The present technology relates to a hanging device installed for the lifting and lowering of an elevator car and a weight on a double-row rope (or belt) with a 2:1 to 8:1 rope fastening method of an elevator. The hanging device is not only for the elevator car but also for individualizing a plurality of integral fixed pulleys installed for secondary traction so that each pulley operates independently from an adjacent pulley. In addition, the technology relates to a technology that requires the lifespan of a bearing that is rotatable inside a pulley to be pulled to be suitable for high speeds or high loads according to the requirements that the elevator is pursuing for high speeds or high loads.

[0002] In general, an elevator is a type of transportation device that vertically raises and lowers a car installed in a hoistway inside a structure by driving a hoisting machine, allowing passengers to move quickly and smoothly between floors.

[0003] In order to raise and lower the car of the above-mentioned elevator, multiple ropes (or belts) are connected in various ways based on the driving means, which is the traction machine, and a 2:1 to 8:1 rope fastening method can be applied.

[0004] Here, the 2:1 rope fastening method in an elevator has a technical configuration in which, as illustrated in FIG. 1, a driving sheave (11) rotated by a traction machine, a plurality of ropes (R) wound around the driving sheave (11) for raising and lowering, one end of the ropes is connected to a known tension adjusting means (12) based on the driving sheave (11) and wound around a car sheave (13) located above a car (20), and the other end of the rope is connected to a known tension adjusting means (12A) and wound around a weight sheave (14) located above a weight (30). Typically, the car sheave (13) and the weight sheave (14) are defined as "hanging sheaves" in the elevator glossary.

[0005] The above-mentioned car is raised or lowered by the driving of the drive sheave, and as the car is lowered or raised, the car sheave, which is a hanging sheave, and the weight sheave are also raised and lowered.

[0006] Here, the rope section (hereinafter referred to as “section A”) connected between the tension adjustment means and the case sheave, and the rope section (hereinafter referred to as “section B”) connected between the weight sheave and the tension adjustment means can secure sections in which the tension of the rope can be adjusted by each tension adjustment means.

[0007] However, the rope section between the car sheave and the driving sheave (hereinafter referred to as the “C section”) and the rope section between the driving sheave and the weight sheave (hereinafter referred to as the “D section”) are sections where the tension cannot be adjusted.

[0008] In other words, since the drive sheave, the car sheave, and the weight sheave are formed as one piece with each sheave groove in which multiple ropes are wound, the tension of the ropes located in the C section as well as the D section cannot be adjusted.

[0009] This means that if any one of the ropes is shortened or lengthened, or if uneven wear occurs in one or more of the sheave grooves of the driving sheave, the car sheave, which is the hanging sheave around which each rope is wound, as well as the weight sheave, must rotate independently and unevenly so that the two lines of the sheave, i.e., the A line and the C line, and the B line and the D line, around which the rope is wound half-rotatably to tow the car or weight, can be synchronized, but because they are formed as one, the two lines of the traction sheave cannot be synchronized.

[0010] This causes frequent problems such as rope breakage or severe vibration in the 2:1 to 8:1 rope fastening method.

[0011] In order to solve the above problem, as shown in FIG. 2, the applicant of the present invention discloses a 'hanging sheave applied to a 2:1 rope fastening method for an elevator', which is a domestically registered patent No. 10-2092078, and its configuration is as follows: a mounting shaft in which each rope is wound around the hanging sheave so that the movement of each rope is free according to the amount of tension change of each rope; and a plurality of split sheaves in which each sheave groove, in which each rope is wound, is formed on the mounting shaft and is rotatable so that the movement of each rope is free according to the amount of tension change of each rope wound therearound; and the hanging sheave applied to a 2:1 rope fastening method for an elevator is provided.

[0012] Accordingly, it is possible to prevent the rope from breaking in the 2:1 rope connection method for elevators, and it is possible to ensure that the car can be raised and lowered stably, and it is also possible to secure a long service life.

[0013] However, in the case of the above-mentioned conventional technology, bearings are provided for each split sheave that rotates independently in multiple configurations on the outer surface of one mounting shaft to enable rotation, but a problem occurs in that the durability of the bearings is reduced in response to the change in tension of the rope and the high-speed rotation and high load of the split sheave.

[0014] In order to solve the above-described conventional problems, the present invention aims to improve the durability of bearings by changing the installation structure of bearings provided in a split sheave with high-speed, high-load applications applied differently according to the amount of tensile change of ropes, belts, etc.

[0015] In order to solve the above-described conventional problems, the present invention provides an elevator hanging sheave having a load reduction function of a bearing, which is a hanging sheave that rotates by a connecting means (R) made of a rope or a belt for the purpose of raising and lowering an elevator car, wherein the hanging sheave comprises a mounting shaft (100), a first bearing member (200) that is provided to be rotatable in the longitudinal direction of the outer surface of the mounting shaft (100), a second bearing member (300) that is provided with an inner surface on the outer surface of the first bearing member (200) so as to be rotatable to form a double-layer structure, and an external pulley (400) that is installed on the outer surface of the second bearing member (300) so as to be independently rotatable, and on the outer surface of which a connecting means (R) is wound.

[0016] In addition, it is preferable that the first bearing member (200) and the second bearing member (300) are provided as a pair corresponding to the outer peripheral surface area of ​​the external pulley (400) that interfaces with the connecting means (R).

[0017] Meanwhile, in a hanging sheave that rotates by a connecting means (R) made of a rope or belt for the car raising and lowering of an elevator, the hanging sheave comprises a mounting shaft (100), a first bearing member (200) that is provided to be rotatable in the longitudinal direction of the outer surface of the mounting shaft (100), a second bearing member (300) that is provided to be rotatable with an inner surface installed on the outer surface of the first bearing member (200) so as to have a double-layer structure, an external pulley (400) that is rotatably installed with an inner surface on the outer surface of the second bearing member (300) and on which a connecting means (R) is movably wound, a drum (500) that is provided to be rotatable between the outer surface of the second bearing member (300) and the inner surfaces of a pair of external pulleys (400), and an external pulley (400) that is provided on the outer surface of the drum (500) so that the external pulley (400) can rotate. Another feature is that it includes a third bearing member (600).

[0018] Here, the hanging sheave further includes a snap ring (120) to prevent the first bearing member (200), the second bearing member (300), the third bearing member (600) and the external pulley (400) from being detached, and it is preferable that the snap ring (120) be inserted into a snap ring groove (130) formed on the outer surface of the mounting shaft (100) and the outer and inner surfaces of the drum (500), respectively.

[0019] Here, the drums (500) are preferably provided in multiple numbers on the outer surface of the mounting shaft (100), and each drum (500) is preferably provided with a pair of the first bearing member (200) and the second bearing member (300) on both sides of the inner surface to have a double-layer structure.

[0020] Here, it is preferable that a pair of the third bearing members (600) are provided on the inner surface of each of the outer pulleys (400) provided in pairs on the outer surface of the drum (500).

[0021] Here, it is preferable that an insertion groove (510) is formed on the inner surface of the drum (500) at a position corresponding to the second bearing member (300) for inserting the second bearing member (300).

[0022] Here, it is preferable that at least one of the first bearing member (200), the second bearing member (300), and the third bearing member (600) is a ball bearing, a needle bearing, or a metal bearing.

[0023] According to the present invention, unlike the conventional method, the first and second bearing members, which are installed in a single or double layer structure on the lower part of the external pulley or drum and rotate independently in response to the amount of tensile change of the connecting means, are expected to rotate by sharing the number of rotations, thereby improving durability due to a reduction in the load on the bearing.

[0024] Figure 1 is a drawing showing a conventional hanging sheave connection structure with a kawa weight installed.

[0025] Fig. 2 is a perspective view showing a conventional hanging sheave.

[0026] FIG. 3 and FIG. 4 are drawings showing a hanging sheave for an elevator having a load reduction function of a bearing according to the present invention, which is formed of a single serial double-layer structure.

[0027] Figures 5 and 6 are other embodiments of the first and second bearing members for Figures 3 and 4.

[0028] FIG. 7 is a drawing showing a hanging sheave for an elevator having a load reduction function of a bearing according to the present invention having a double serial duplex structure for FIG. 3.

[0029] Figure 8 is a diagram showing the working relationship of the first and second bearing members for an elevator hanging sheave having a load reduction function of a bearing according to the present invention.

[0030] Fig. 9 is another embodiment of a hanging sheave for an elevator having a load reduction function of a bearing according to the present invention.

[0031] Fig. 10 is a cross-sectional view of Fig. 9.

[0032] Fig. 11 is another embodiment of the drum for Fig. 9.

[0033] Fig. 12 is another embodiment of the third bearing member for Fig. 9.

[0034] Hereinafter, with reference to the attached drawings, a hanging sheave for an elevator having a load reduction function of a bearing according to the present invention (hereinafter simply referred to as a “hanging sheave”) will be described in detail for each embodiment.

[0035] Before the explanation, the external pulley (400) described below means a conventional pulley having a connecting means (R) such as a rope or belt wound around the outer surface and capable of rotating in the direction of travel of the connecting means (R). A detailed explanation thereof will be omitted so as not to obscure the gist of the present invention.

[0036] First, as shown in FIGS. 3 and 4, the hanging sheave (1) according to the present invention includes a mounting shaft (100), a first bearing member (200), a second bearing member (300), and an external pulley (400).

[0037] To explain in more detail, the above-mentioned mounting shaft (100) is configured to enable the lifting and lowering of a car or weight through the tensile force of a connecting means (R) including a rope or belt, etc., by rotatably mounting an external pulley (400) to be described later on the outer surface (see Fig. 1).

[0038] To this end, the mounting shaft (100) is formed into a cylindrical shape having a predetermined overall length, and fastening holes (110) are formed at both ends for installation on a conventional bracket or frame existing on the upper part of a car or weight.

[0039] And, as illustrated, the first bearing member (200) is configured to be installed on the mounting shaft (100) to have a multi-layer (or laminated) structure together with the second bearing member (300) described later, and a ring-shaped ball bearing can be used overall.

[0040] As shown, the first bearing member (200) is installed so that the inner surface can rotate independently by contact with the outer surface of the mounting shaft (100) corresponding to the number of connecting means (R).

[0041] And, the second bearing member (300) is installed to have a double-layer structure with the first bearing member (200) described above, with a connecting means (R) wound around the outer surface so that it can rotate in the direction of movement of the connecting means (R).

[0042] For example, the second bearing member (300) is formed in the same shape as the first bearing member (200), but is joined to form a concentric circle with the first bearing member (200) to satisfy the double-layer structure.

[0043] Meanwhile, in the present invention, the first and second bearing members (200, 300) may be made to use needle bearings in addition to ball bearings so that they can be easily applied to the high speed of the external pulley (400) to be suitable for high speed and high load.

[0044] In addition, the first bearing member (200) in the present invention can satisfy the double-layer structure with a double bearing structure, but as needed, it is also possible to use a plurality of bearings to have a double-layer structure on the outer surface of the mounting shaft (100) as shown in FIG. 5 or FIG. 6.

[0045] Furthermore, in the present invention, the first and second bearing members (200, 300) may be provided in a double series manner in which a pair is provided on both sides of the inner surface of the outer pulley (400), in addition to the single series manner, in accordance with the area of ​​the outer surface of the outer pulley (400) that contacts the connecting means (R), so that independent rotation of the outer pulley (400) can be performed, as shown in FIG. 7.

[0046] According to the above, when the progress of the connecting means (R) is determined through the raising and lowering of the car and the weight, the second bearing member (300) that contacts the connecting means (R) rotates, thereby executing independent rotation of each external pulley (400).

[0047] Then, the kinetic force resulting from the high-speed rotation of the second bearing member (300) that interfaces with the connecting means (R) is transmitted to the first bearing member (200) that does not interface with the connecting means (R) so that it can rotate, and through this, as the multiple bearings rotate separately from each other, a reduction in the load resulting from the high-speed rotation can be expected, and through this, the durability of the bearing is improved.

[0048] At this time, the rotational speed distribution of the first and second bearing members (200, 300) is ideally such that the first bearing member (200) and the second bearing member (300) each rotate 1 / 2 of a turn based on one turn. Although not shown, in the case of three bearings of a double-layer structure, it is preferable to rotate them by dividing them by 1 / 3 of a turn each.

[0049] That is, as illustrated in FIG. 8, while the second bearing member (300) in direct contact with the connecting means (R) rotates from point P1 to point P2 by half the distance, the first bearing member (200) that does not contact the connecting means (R) rotates from point P2 to point P1, which is the origin, by an ideal action of dividing the number of rotations for one rotation by half the distance, thereby minimizing the load on the bearing and improving durability.

[0050] Furthermore, according to the multi-layer structure of the first and second bearing members (200, 300) described above, even if one bearing member loses its function due to long-term use, the other bearing member can additionally be expected to faithfully perform its bearing function.

[0051] Meanwhile, the hanging sheave (1) according to the present invention may have another embodiment further including a drum (500) and a third bearing member (600), as shown in FIGS. 9 and 10.

[0052] Before the explanation, another embodiment described below will be described as an example of a double serial stacking method in order to clearly understand the gist of the present invention.

[0053] In another embodiment, the drum (500) may have first and second bearing members (200, 300) having a double-layer structure on both sides of the inner surface as shown, and a third bearing member (600) in the form of a needle bearing is rotatably installed on the outer surface.

[0054] At this time, it is preferable that an insertion groove (510) be formed on the inner surface of the drum (500) so that the first and second bearing members (200, 300) are inserted so as to prevent the overall outer diameter of the hanging sheave (1) of the present invention from increasing in consideration of the outer diameter size of the drum (500).

[0055] The drum (500) can be formed in the shape of a pipe with both sides open, and a snap ring (120) can be detachably mounted on the inner or outer surface to prevent the first to third bearing members (200, 300, 600) from being detached.

[0056] To this end, the snap ring (120) has a structure in which it is inserted and fixed in a shape-fitting manner into a snap ring groove (130) formed in the drum (500), and, if necessary, the snap ring (120) and the snap ring groove (130) can also be formed separately and used on the outer surface of the above-described mounting shaft (100).

[0057] At this time, the drum (500) may be provided with a plurality of configurations on the outer surface of the mounting shaft (100), as shown in FIG. 11, and it is preferable that the first and second bearing members (200, 300) are inserted and installed in the insertion groove (510) on the inner surface of each drum (500).

[0058] The third bearing member (600) is installed as a pair on the inner surface of one external pulley (400) provided on the outside of the drum (500) to enable independent rotation of the external pulley (400).

[0059] Of course, the third bearing member (600) in the present invention may also use a metal bearing as needed in accordance with the drum (500) configuration, as shown in FIG. 12.

[0060] According to the above, the drum (500) and the third bearing member (600) used in another embodiment of the hanging sheave (1) of the present invention can further maximize the effect of improving the durability of the bearing used in the hanging sheave (1) for high loads.

[0061] As described above, the hanging sheave (1) according to each embodiment of the present invention is expected to have an effect of improving durability due to a reduction in the load on the bearing as the first and second bearing members (200, 300) installed in a single or double layer structure on the lower part of the external pulley (400) or drum (500) that independently rotate in response to the amount of tension change of the connecting means (R) are rotated by sharing the rotational speed, which is different from the conventional one.

Claims

1. In a hanging sheave that rotates by a connecting means (R) made of a rope or belt for the purpose of raising and lowering an elevator car, The above hanging sieve Mounting shaft (100); A first bearing member (200) provided to be rotatable in the longitudinal direction of the outer surface of the above-mentioned mounting shaft (100); A second bearing member (300) having an inner circumference installed on the outer circumference of the first bearing member (200) and rotatably provided to form a double-layer structure; and An elevator hanging sheave having a load reduction function of a bearing, characterized in that it includes an external pulley (400) mounted on the outer surface of the second bearing member (300) so as to be capable of independent rotation, and having a connecting means (R) wound around the outer surface.

2. In paragraph 1, An elevator hanging sheave having a load reduction function of a bearing, characterized in that the first bearing member (200) and the second bearing member (300) are provided as a pair corresponding to the outer peripheral surface area of ​​the external pulley (400) that interfaces with the connecting means (R).

3. In a hanging sheave that rotates by a connecting means (R) made of a rope or belt for the purpose of raising and lowering an elevator car, The above hanging sieve Mounting shaft (100); A first bearing member (200) provided to be rotatable in the longitudinal direction of the outer surface of the above-mentioned mounting shaft (100); A second bearing member (300) having an inner circumference installed on the outer circumference of the first bearing member (200) and rotatably provided to have a mutually double-layered structure; An external pulley (400) which is rotatably installed on the outer surface of the second bearing member (300) and on which a connecting means (R) is movably wound; A drum (500) rotatably provided between the outer surface of the second bearing member (300) and the inner surface of a pair of external pulleys (400); and An elevator hanging sheave having a load reduction function of a bearing, characterized by including a third bearing member (600) provided on the outer surface of the drum (500) so that the external pulley (400) can rotate.

4. In paragraph 3, The above hanging sieve Further comprising a snap ring (120) for preventing the first bearing member (200), the second bearing member (300), the third bearing member (600) and the external pulley (400) from being detached; An elevator hanging sheave having a load reduction function of a bearing, characterized in that a snap ring (120) is inserted into a snap ring groove (130) formed on the outer surface of the mounting shaft (100) and the outer and inner surfaces of the drum (500), respectively.

5. In paragraph 3, The above drum (500) An elevator hanging sheave having a load reduction function of a bearing, characterized in that a plurality of the first bearing members (200) and the second bearing members (300) are provided on the outer surface of the above-mentioned mounting shaft (100), and each of the inner surfaces of the drum (500) is provided with a pair of the first bearing members (200) and the second bearing members (300) having a double-layer structure.

6. In paragraph 3, An elevator hanging sheave having a load reduction function of a bearing, characterized in that a pair of the third bearing members (600) are provided on the inner surface of each of the outer pulleys (400) provided in pairs on the outer surface of the drum (500).

7. In paragraph 3, An elevator hanging sheave having a load reduction function of a bearing, characterized in that an insertion groove (510) is formed on the inner surface of the drum (500) so that the second bearing member (300) is inserted at a position corresponding to the second bearing member (300).

8. In paragraph 3, An elevator hanging sheave having a load reduction function of a bearing, characterized in that at least one of the first bearing member (200), the second bearing member (300), and the third bearing member (600) is a ball bearing, a needle bearing, or a metal bearing.

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