CN112875463B - Elevator and pulley - Google Patents
Elevator and pulley Download PDFInfo
- Publication number
- CN112875463B CN112875463B CN201911196476.6A CN201911196476A CN112875463B CN 112875463 B CN112875463 B CN 112875463B CN 201911196476 A CN201911196476 A CN 201911196476A CN 112875463 B CN112875463 B CN 112875463B
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- Prior art keywords
- crack
- pulley
- reference hole
- elevator
- outer peripheral
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/12—Checking, lubricating, or cleaning means for ropes, cables or guides
- B66B7/1207—Checking means
- B66B7/1246—Checking means specially adapted for guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/02—Guideways; Guides
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- Cage And Drive Apparatuses For Elevators (AREA)
Abstract
The present invention relates to an elevator and a sheave. The pulley is used for an elevator, and is provided with: a boss portion located at the central portion; an outer peripheral portion located at the outer peripheral portion; a connecting portion located between the boss portion and the outer peripheral portion, the connecting portion being provided with at least one reference hole; a crack marker provided in the vicinity of the reference hole of the connection portion; and a crack-developing portion formed between the crack-marking portion and the reference hole, the crack-developing portion having a lower strength than other portions.
Description
Technical Field
The present invention relates to an elevator, and more particularly, to a sheave for an elevator.
Background
In an elevator, a main rope made of a rope such as a wire rope is usually connected to a car and a counterweight, and the car is raised and lowered in a hoistway by friction between a sheave and the main rope in a hoisting machine.
The sheave used in such an elevator includes, for example: a sleeve part for sleeving a bearing, a wheel shaft and the like; an outer peripheral portion for winding the main cord; and a through hole for reducing the weight of the wheel body (for example, chinese patent application publication No. CN 106744155).
The sheaves of an elevator are subjected to a cyclic load during hoisting and lowering due to the suspension load of the ropes. Pulleys subjected to such cyclic loading over the years sometimes develop cracks that extend (develop) until the pulley breaks (fails). However, in the maintenance work, since the detection site is not clear, it is difficult to find a crack in advance.
Disclosure of Invention
The present invention has been made to solve at least one of the above problems, and an object of the present invention is to provide a pulley that can improve maintenance effects by specifying a crack portion to be detected during maintenance work.
In order to solve the above-mentioned problem, a sheave of the present invention is used for an elevator, and includes: a boss portion located at the central portion; an outer peripheral portion located at the outer peripheral portion; a connecting portion located between the boss portion and the outer peripheral portion, the connecting portion being provided with at least one reference hole; a crack marker provided in the vicinity of the reference hole of the connection portion; and a crack-developing portion formed between the crack-marking portion and the reference hole, the crack-developing portion having a lower strength than other portions.
Preferably, the crack indicator is circular.
Preferably, the crack indicator is a through hole.
Preferably, one of the crack indicators is provided for each of the reference holes.
Preferably, two or more of the crack indicators are provided for each of the reference holes.
Preferably, the reference hole is an ellipse, and the crack mark portion is provided between the reference hole and the outer peripheral portion.
Preferably, the pulley is made of resin.
The invention also provides an elevator, which is provided with the pulley.
The pulley of the invention can confirm the crack detection part in the maintenance operation, thereby improving the maintenance effect and further improving the safety of the elevator. Moreover, unnecessary replacement of the pulley is avoided by clearly judging the crack, so that the service life of the pulley is prolonged, and the cost can be reduced.
Problems, structures, and effects other than those described above will be apparent from the following description of the embodiments.
Drawings
Fig. 1 shows an example of a pulley according to an embodiment of the present invention.
Fig. 2 is a partially enlarged view of fig. 1 for explaining the crack indicating portion and the crack developing portion.
Fig. 3 shows an example of a pulley according to another embodiment of the present invention.
Fig. 4 shows an example of a sheave of an elevator to which the present invention is applied.
< notation in the drawing >
1, a shaft sleeve part; 2 an outer peripheral portion; 3, a connecting part; 4 a crack-marking portion; 5 a crack-developing portion; 6: a shaft hole; 7 a reference hole; 8 rib parts; 9, a main rope; 10 a car; 11 a car lower sheave; 12 counterweight; 13 a counterweight pulley; 14 top pulley.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings and examples.
The present invention can be applied to pulleys manufactured by various manufacturing methods. As an example, it can be applied to various castings. As an example, the resin composition can be applied to various resin molded articles.
Fig. 1 shows an example of a pulley according to an embodiment of the present invention. It is assumed that the illustrated pulley is a molded article made of resin.
The illustrated pulley includes: a boss portion 1 located at a central portion, an outer peripheral portion 2 located at an outer peripheral (edge) portion, and a connecting portion 3 located between the boss portion 1 and the outer peripheral portion 2. The pulley further includes: a crack-marking portion 4 and a crack-emerging portion 5.
The boss portion 1 has a shaft hole 6 at its center for receiving a bearing, a pulley shaft (a rotary shaft), and the like. For example, the pulley shaft is mounted into the shaft hole 6 of the boss portion 1 via a bearing.
The outer peripheral portion 2 is provided concentrically with the boss portion 1. A groove (not shown) is provided on the circumferential surface of the outer circumferential portion 2 to wind the main rope. The number of the grooves corresponds to that of the main ropes.
The connecting portion 3 is provided with at least one reference hole 7. The reference hole 7 is a through hole formed in molding to facilitate demolding. The provision of the reference hole 7 can reduce the mass of the pulley. The reference hole 7 may be used for fixing a chuck or the like in a subsequent process after molding, for example, cutting.
The connecting portion 3 has ribs 8 arranged radially. The rib 8 can enhance the strength of the pulley. The number of the ribs 8 is not limited, and may be set as appropriate in consideration of the use of the pulley and the like. The rib 8 is provided in a radial direction in a strip shape, and a portion of the connecting portion 3 other than the rib 8 forms a plate-like region (hereinafter also referred to as a "plate portion"). The reference hole 7 is provided in the plate portion between the two ribs 8.
The rib 8 has a thickness substantially the same as that of the boss 1 and the outer peripheral portion 2, and the plate portion has a thickness thinner than that of the boss 1 and the outer peripheral portion 2. That is, the plate portions between the rib portions 8 are recessed portions that are formed by being recessed from the front end surface (front surface in the drawing) and the rear end surface and have a thickness thinner than the boss portion 1 and the outer peripheral portion 2. This can reduce the mass of the pulley and reduce the weight of the pulley.
The crack indicator 4 is provided near the reference hole 7 of the connector 3. The crack indicator 4 is small and has a maximum dimension at least smaller than the reference hole 7. The method of forming the crack indicator 4 is not limited. As an example, it may be formed at the time of molding (casting at the time of casting). As an example, the cutting work may be performed in a subsequent step after the molding. As an example, etching may be used.
The form of the crack-marking portion 4 is not limited. As an example, it may be a groove. As an example, a through hole (through hole) may be provided. As an example, it may be a blind hole. As an example, it may be circular. As an example, it may be elliptical. As an example, it may be polygonal.
The number of the crack markers 4 is not limited. As an example, one crack flag 4 may be provided for each reference hole 7. As an example, two or more crack indicators 4 may be provided for each reference hole 7. As an example, one crack indicator 4 may be provided for every two reference holes 7. As an example, one or two or more crack indicators 4 may be provided regardless of the number of reference holes 7.
The crack-developing portion 5 is formed between the crack-marking portion 4 and the reference hole 7, and the strength of the crack-developing portion 5 is lower than that of the other portions. The crack developing portion 5 is a portion formed to detect cracks of the pulley.
The sheaves of an elevator are subjected to a cyclic load as a result of the operation of the elevator. More specifically, the position of the pulley subjected to the suspension load changes from moment to moment due to the rotation. Therefore, it is unclear where the crack occurs in the pulley. Therefore, it is unclear where the inspection should be performed in the maintenance work, and it is difficult to find the crack in advance.
By providing the crack indicator 4 near the reference hole 7, the pulley is intentionally formed with the crack appearing portion 5 having a strength weaker than that of the other portion between the reference hole 7 and the crack indicator 4. With this arrangement, if a crack occurs in the sheave during use, the crack appears (appears) in the crack appearing portion 5.
Fig. 2 is a partially enlarged view of fig. 1 for explaining the crack-marking portion 4 and the crack-emerging portion 5. As shown in the figure, when the sheave is cracked in use, the crack a appears in the crack-appearing portion 5 having a lower strength than other portions. More specifically, the crack a appears at the edge of the reference hole 7 and progresses toward the crack-marked portion 4. In the maintenance work, the crack indicating section 5 is guided using the crack indicating section 4 as a mark, and the crack indicating section 5 is detected to detect whether or not a crack is present and the progress of the crack.
With such a structure, the crack detection position of the pulley is determined, so that the maintenance effect is improved, and the safety of the elevator is further improved. Moreover, by clearly judging the crack, unnecessary replacement of the pulley is avoided, and the service life of the pulley is prolonged, so that the cost can be reduced.
Such a pulley structure is particularly suitable for a pulley made of resin. This is because the strength of the resin pulley is lower than that of a cast member using cast iron or the like, and cracks are more likely to occur than in the cast member. Further, resin products are easily affected by humidity, ultraviolet rays, and the like, and the strength in use for a long time is greatly affected by these environmental factors, and thus cannot be predicted in advance.
The crack-indicating portion 5 is formed between the reference hole 7 and the crack-indicating portion 4 by providing the crack-indicating portion 4 in the vicinity of the reference hole 7 because stress is concentrated on the edge of the through hole, and particularly in the case where the reference hole 7 is provided in a plate portion which is thinner and has a lower strength than other portions, it can be analyzed that the edge of the reference hole 7 is the portion having the lowest strength.
The distance from the crack marker 4 to the reference hole 7 is not limited, and may be a visually recognizable position.
The direction in which the crack markers 4 are disposed is not limited, and may be set by analyzing the force applied to the sheave, for example, in the direction in which the force is the greatest, depending on the position of the sheave in the elevator and the method of use (e.g., the angle at which the rope is wound, for example, 90 degrees or 180 degrees).
The crack marker 4 is provided in consideration of the shape of the reference hole 7. As shown in the drawing, the reference hole 7 of this example is an ellipse, and the major axis direction thereof substantially coincides with the radial direction of the pulley. The crack mark portion 4 is provided between the reference hole 7 and the outer peripheral portion 2, considering that the main cord is wound around the outer peripheral portion 2 and a force received in the outer peripheral direction is large. For example, the reference hole 7 may be provided on an extension of the major axis thereof.
Here, the crack-marked portion 4 is a circular small hole smaller than the reference hole 7, but can be visually confirmed. By providing the circular small hole, the strength of the portion (crack development portion 5) between the reference hole 7 and the circular small hole (crack marked portion 4) is made lower than the other portions in the pulley, and if a crack occurs, the crack is caused to occur at this portion (crack development portion 5).
The crack indicator 4 is provided in a circular shape, and can smooth (uniformize) the stress.
The crack indicator 4 is provided as a through hole, and the crack can be stopped at this point.
This arrangement allows the crack indicator 4 to also serve as a crack suppressor. As shown in fig. 2, the crack a extends from the reference hole 7 in the direction of the crack-marked portion 4, and after reaching the crack-marked portion 4, the crack a ends. Since the crack indicator 4 also serves as a crack suppressor and requires a long time to form a new crack, it can be discovered and replaced during maintenance before the pulley breaks.
The crack indicator 4 can be formed in the molding and thus can be simply manufactured. But may of course also be formed in a subsequent process step, for example by drilling.
In the present embodiment, one crack flag 4 is provided for each reference hole 7. This is because the sheave rotates during elevator operation, and therefore the crack-appearing portion 5 is formed between each reference hole 7 and the crack-marking portion 4, and inspection is performed for each reference hole 7.
Two or more crack indicators 4 may be provided for each reference hole 7.
Fig. 3 shows an example of a pulley according to another embodiment of the present invention.
In this example, the reference holes 7 are circular, and two crack indicators 4 are provided for each reference hole 7. Two crack-emerging portions 5 are thus formed with respect to each reference hole 7.
The two crack markers 4 are symmetrically disposed on both sides of the reference hole 7, for example. More specifically, for example, the reference holes 7 and the ribs 8 are respectively provided between them in the circumferential direction, and are respectively provided within the range of positions where the reference holes 7 are located in the radial direction. That is, the crack indicator 4 is provided within a virtual circular ring (within the dotted line shown in the figure) having a large diameter of the reference hole 7.
Therefore, two crack-emerging portions 5 are symmetrically formed between the two crack-marking portions 4 and the reference hole 7. That is, the crack-developing portion 5 is formed within a range of an imaginary circle (within the range of the illustrated broken line) having a large diameter of the reference hole 7.
Fig. 4 shows an example of a sheave of an elevator to which the present invention is applied.
As an example, the pulley of the present invention can be applied to various pulleys around which the main rope 9 is wound as shown in fig. 4. As an example, the present invention can be applied to a car sheave provided in the car 10, for example, an under-car sheave 11 provided below the car as shown in the figure. Of course, the present invention can be applied to such an upper car sheave when the sheave is provided above the car. Further, the present invention can also be applied to a counterweight pulley 13 provided in the counterweight 12 as shown in the figure. The present invention can also be applied to a top sheave 14 fixedly installed in an upper position of the hoistway B as shown in the figure.
Needless to say, the sheave of the present invention can be applied not only to the 2: 1 rope winding type elevator shown in fig. 4 but also to various types of elevators such as a 1: 1 rope winding type elevator, and the description thereof is omitted.
An elevator including the sheave of the present invention includes a structure used for operation of the elevator, such as a hoisting machine and a brake device, in addition to the structures of the car 10, the counterweight 12, and the like in fig. 4. Since various known structures can be adopted, detailed description is omitted here.
The present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the above-described embodiments are described in detail to explain the present invention easily and clearly, but the present invention is not necessarily limited to include all the structures described. Further, a part of the structure of one embodiment can be replaced to the structure of another embodiment, and further, the structure of another embodiment can be added to the structure of one embodiment. Further, addition, deletion, and replacement of another structure can be performed on a part of the structures of the embodiments.
Claims (8)
1. A sheave used in an elevator, comprising:
a boss portion located at the central portion;
an outer peripheral portion located at the outer peripheral portion;
A connecting portion located between the boss portion and the outer peripheral portion, the connecting portion being provided with at least one reference hole;
a crack marker provided in the vicinity of the reference hole of the connection portion; and
a crack-developing portion formed between the crack mark portion and the reference hole, the crack-developing portion having a lower strength than other portions.
2. The pulley according to claim 1,
the crack flag is circular.
3. The pulley according to claim 1,
the crack-marking portion is a through hole.
4. The pulley according to claim 1,
one of the crack indicators is provided with respect to each of the reference holes.
5. The pulley according to claim 1,
two or more of the crack markers are provided for each of the reference holes.
6. The pulley according to claim 1,
the reference hole is of an elliptical shape and,
the crack mark portion is provided between the reference hole and the outer peripheral portion.
7. The pulley according to claim 1,
the pulley is made of resin.
8. An elevator is characterized in that the elevator is provided with a lifting device,
A pulley according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911196476.6A CN112875463B (en) | 2019-11-29 | 2019-11-29 | Elevator and pulley |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911196476.6A CN112875463B (en) | 2019-11-29 | 2019-11-29 | Elevator and pulley |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112875463A CN112875463A (en) | 2021-06-01 |
| CN112875463B true CN112875463B (en) | 2022-06-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911196476.6A Active CN112875463B (en) | 2019-11-29 | 2019-11-29 | Elevator and pulley |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112875463B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB189726712A (en) * | 1897-11-16 | 1897-12-18 | John Edward Donovan | Cast Iron Pulleys. |
| CN203283999U (en) * | 2013-06-21 | 2013-11-13 | 昆山通祐电梯有限公司 | Rope race detection device of guide pulley |
| KR20160131683A (en) * | 2015-05-08 | 2016-11-16 | 한국후꼬꾸 주식회사 | One body type damper pulley and the manufuacturing method thereof |
| CN205932818U (en) * | 2016-07-30 | 2017-02-08 | 徐雪宜 | Self -detection leading wheel |
-
2019
- 2019-11-29 CN CN201911196476.6A patent/CN112875463B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB189726712A (en) * | 1897-11-16 | 1897-12-18 | John Edward Donovan | Cast Iron Pulleys. |
| CN203283999U (en) * | 2013-06-21 | 2013-11-13 | 昆山通祐电梯有限公司 | Rope race detection device of guide pulley |
| KR20160131683A (en) * | 2015-05-08 | 2016-11-16 | 한국후꼬꾸 주식회사 | One body type damper pulley and the manufuacturing method thereof |
| CN205932818U (en) * | 2016-07-30 | 2017-02-08 | 徐雪宜 | Self -detection leading wheel |
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| Publication number | Publication date |
|---|---|
| CN112875463A (en) | 2021-06-01 |
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