HK1111397B - Hoist cable falling-proof device of elevator - Google Patents

Description

Sling falling prevention device for elevator

Technical Field

The invention relates to a sling falling prevention device for an elevator, which is used for preventing a sling wound on a pulley from falling off the pulley.

Background

In an elevator, a lifting body is moved by a rope wound around a single or a plurality of pulleys to be lifted and lowered in a lifting passage. Therefore, the elevator must have a structure capable of preventing the suspension ropes from falling off the sheaves.

For this reason, the conventional elevator is also provided with a sling falling prevention device which prevents the sling from falling off the sheave by running out of the sheave groove of the sheave when a large external force is applied to the sling due to an earthquake or the like. For example, there is known a solution in which round rods are provided in the vicinity of a rope winding opening portion on one side of the pulley and a rope winding opening portion on the other side of the pulley at a distance shorter than the diameter of the rope from a projection portion formed between pulley grooves on the outer periphery of the pulley in order to prevent the rope 1 wound around the pulley at an angle of approximately 180 degrees from falling off the pulley, or flat plates are provided in the vicinity of a rope winding opening portion on one side of the pulley at a distance shorter than the diameter of the rope from a projection portion formed between pulley grooves on the outer periphery of the pulley in order to prevent the rope wound around the pulley at an angle of approximately 90 degrees from falling off the pulley.

In the above conventional elevator sling drop preventing device, in order to prevent the sling wound around the pulley from dropping off the pulley and to enable the sling to move smoothly, a round bar and a flat plate used as the sling drop preventing device are installed to be spaced apart from a protrusion formed between the pulley grooves at the outer circumference of the pulley by a size shorter than the diameter of the sling. Therefore, if a large external force acts on the slings in the direction in which the slings are separated from the sheave grooves in the event of an earthquake or the like, the slings may be caught in the gaps formed between the projections formed on the outer periphery of the sheave and the round bar or flat plate, and the slings may not slide.

Disclosure of Invention

The present invention has been made in view of the above problems occurring in the conventional art, and it is an object of the present invention to provide a rope fall-off preventing device for an elevator, which can prevent a rope from running out of a sheave groove even when a large external force is applied to the rope.

In order to achieve the above object, an elevator rope falling prevention device according to a first aspect of the present invention is provided on a pulley having a pulley groove formed on an outer periphery thereof for preventing a rope wound around the pulley from falling off the pulley, wherein the pulley is rotatably supported by a pivot shaft on an upper frame of the elevator, wherein at least one roller is provided between a rope winding opening portion on one side of the pulley and a rope winding opening portion on the other side of the pulley, and the rope is made to slide between the roller and the pulley, the elevator rope falling prevention device includes a pressing mechanism which supports the roller and enables the roller to move, and applies a pressing force acting in a direction toward the pulley to the roller, and the pressing mechanism includes: an elongated hole formed at the upper frame; a spring pressing member provided to the upper frame; a roller shaft movably inserted into the elongated hole for supporting the roller; and a spring having one end attached to the roller shaft and the other end attached to the spring pressing member, and applying a pressing force acting in a direction toward the pulley to the roller.

In the elevator suspension cable falling prevention device according to the first aspect of the present invention having the above-described configuration, the suspension cable wound around the pulley is held between the pulley and the roller, and thereby the suspension cable can be prevented from falling off the pulley. In this way, by adopting the structure in which the rollers serving as the rotating bodies are brought into sliding contact with the slings, not only can the slings be smoothly moved, but also the rollers serving as the slings falling off preventive means can be positioned at positions on the side of the rollers where gaps that would cause the slings to run out of the pulley grooves can be substantially eliminated, whereby the slings can be prevented from running out of the pulley grooves even when a large external force is applied to the slings. The roller supported to be movable is pressed toward the pulley by the pressing mechanism, and the rope is sandwiched between the roller and the pulley, so that the rope can be prevented from falling off the pulley. In this way, the pressing force generated by the pressing mechanism acts on the sling in the direction of the pulley through the roller, so that even if a large external force acts on the sling, the sling falling prevention device of the elevator can prevent the sling from falling out of the pulley groove. Further, the pressing force required to reliably prevent the rope wound around the pulley from falling off the pulley can be applied to the roller, thereby ensuring smooth movement of the rope.

The elevator suspension cable falling prevention apparatus according to the second aspect of the present invention is characterized in that at least an outer peripheral portion of the roller has flexibility.

In the elevator suspension cable falling prevention apparatus according to the second aspect of the present invention having the above-described configuration, the rollers can be brought into sliding contact with the suspension cable in a state of close contact by providing flexibility to the outer peripheral portions of the rollers, and therefore, a gap that causes the suspension cable to fall off the sheaves can be eliminated.

Effects of the invention

According to the present invention, the safety of the elevator can be improved, and when a large external force is applied to the suspension cable due to an earthquake or the like, the suspension cable can be prevented from coming out of the sheave groove.

Drawings

Fig. 1 is a side view showing a first embodiment of a sling fall prevention device for an elevator according to the present invention.

Fig. 2 is a top view of the fall off prevention device of fig. 1 taken along line a-a.

Fig. 3 is a schematic view of the structure of an elevator equipped with the sling fall prevention device of fig. 1.

Fig. 4 is a front view showing a second embodiment of the sling falling prevention device for an elevator according to the present invention.

Fig. 5 is a side view showing a third embodiment of the sling falling prevention device for an elevator according to the present invention.

Fig. 6 is a top view of the sling fall prevention device at line B-B of fig. 5.

Description of the symbols

1 suspension cable

2 Elevator car

3 Elevator car frame

4 elevator cage

5 Pulley

5a Pulley groove

10 device for preventing sling from falling off

11a, 11b roller

12a, 12b roller shaft

21 suspension cable

22 elevator car

23 Elevator car frame

24 elevator cage

25a, 25b pulley

30 device for preventing sling from falling off

31a, 31b roller

32a, 32b roller shaft

33a, 33b roller support

40 device for preventing sling from falling off

41a, 41b roller

42a, 42b long hole (pressing mechanism)

43a, 43b roller shaft

44a, 44b spring pressing member (pressing mechanism)

45a, 45b spring (pressing mechanism)

Detailed Description

An embodiment of an elevator sling fall prevention device according to the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a side view showing a first embodiment of a sling fall prevention device for an elevator according to the present invention. Fig. 2 is a top view of the fall off prevention device of fig. 1 taken along line a-a. Fig. 3 is a schematic view of the structure of an elevator equipped with the sling fall prevention device of fig. 1.

As shown in fig. 3, the elevator has a lifting body, such as an elevator car 2, suspended by a plurality of suspension ropes 1. The elevator car 2 includes an elevator car frame 3 including an upper frame 3a, a vertical frame 3b, and a lower frame 3c, and an elevator car room 4 supported by the elevator car frame 3 via a shock absorber 4 a. Further, a pulley 5 around which the slings 1 are wound at an angle of approximately 180 degrees is rotatably pivotally supported by the upper frame 3a via a pulley shaft 6, and a plurality of pulley grooves 5a are formed in the pulley 5, and the slings 1 move in sliding contact with the pulley grooves, respectively.

As shown in fig. 1 and 2, the fall-off prevention device 10 of the first embodiment includes: a roller 11a provided on a portion of the sling winding opening on one side of the pulley 5 and in sliding contact with the sling 1; a roller 11b provided near the sling winding opening on the other side of the pulley 5 and in sliding contact with the sling 1; a roller shaft 12a rotatably supporting the roller 11a on the upper frame; and a roller shaft 12b rotatably supporting the roller 11b on the upper frame. A plurality of pulley grooves 11a1, 11b1 are provided on the outer peripheries of the rollers 11a, 11b, and the plurality of slings 1 move in sliding contact with the pulley grooves, respectively, and the outer peripheries of the rollers 11a, 11b are formed of flexible members.

In the first embodiment, the hoist rope 1 is held between the pulley 5 and the rollers 11a and 11b at the hoist rope winding opening portion on one side and the hoist rope winding opening portion on the other side of the pulley 5, respectively, so that the hoist rope 1 can be prevented from falling off from the pulley 5 even when a large external force is applied to the hoist rope 1 due to an earthquake or the like. In particular, by providing flexibility to the outer peripheral portions of the rollers 11a and 11b, the rollers 11a and 11b can be brought into sliding contact with the wire 1 in a state of close contact, and a gap that causes the wire 1 to come out of the pulley groove 5a can be eliminated, so that the wire can be reliably prevented from coming off.

According to the first embodiment, since the rollers 11a and 11b as the rotating bodies are in sliding contact with the hoist cable 1, not only can the hoist cable 1 be smoothly moved, but also the rollers 11a and 11b can be positioned at the pulley 5 side at a position where a gap causing the hoist cable 1 to come out of the pulley groove 5a can be substantially eliminated, whereby the hoist cable falling off preventive device for an elevator can prevent the hoist cable 1 from coming out of the pulley groove even when a large external force is applied to the hoist cable

Fig. 4 is a front view showing a second embodiment of the sling falling prevention device for an elevator according to the present invention.

As shown in fig. 4, the bottom suspension type elevator includes a lifting body, such as an elevator car 22, suspended by a plurality of suspension ropes 21. The elevator car 22 includes an elevator car frame 23 including an upper frame 23a, a vertical frame 23b, and a lower frame 23c, and an elevator car room 24 supported by the elevator car frame 23 via a shock absorber 24 a. Further, a pulley 25a around which the sling 21 is wound at an angle of substantially 90 degrees is attached to one end of the lower frame 23c by a bracket 26a, and the pulley 25a is rotatably supported on the bracket 26a via a pulley shaft 27 a. Further, a pulley 25b around which the sling 21 is wound at an angle of substantially 90 degrees is mounted on the other end of the lower frame 23c by a bracket 26b, and the pulley 25b is rotatably pivotally supported on the bracket 26b via a pulley shaft 27 b.

The fall-off preventive device 30 of the second embodiment includes: a roller 31a provided near a rope winding opening portion on one side of the pulley 25a and in sliding contact with the rope 21; a roller 31b provided near a rope winding opening portion on one side of the pulley 25b and in sliding contact with the rope 21; a roller shaft 32a rotatably supporting the roller 31a, and a roller bracket 33a mounted on the bracket 26 a; and a roller shaft 32b rotatably supporting the roller 31b, and a roller bracket 33b mounted on the bracket 26 b.

In the second embodiment, the rope 21 is held between the pulley 25a and the roller 31a at the rope winding opening portion on the pulley 25a side, and the rope 21 is held between the pulley 25b and the roller 31b at the rope winding opening portion on the pulley 25b side, whereby the rope 21 can be prevented from falling off from the pulleys 25a and 25b even if a large external force acts on the rope 21 due to an earthquake or the like.

According to the second embodiment, even when the suspension wire 21 is applied to a bottom-suspended elevator, the suspension wire 21 can be prevented from falling out of the sheave groove even when a large external force acts on the suspension wire 21.

Fig. 5 is a side view showing a third embodiment of the sling falling prevention device for an elevator according to the present invention. Fig. 6 is a top view of the sling fall prevention device at line B-B of fig. 5. The same reference numerals are used to denote the same parts as those in fig. 1 to 3.

As shown in fig. 5 and 6, the fall-off prevention device 40 of the third embodiment includes: a roller 41a provided on a portion of the sling winding opening on one side of the pulley 5 and in sliding contact with the sling 1; a roller 41b provided near the sling winding opening on the other side of the pulley 5 and in sliding contact with the sling 1; a roller shaft 43a movably inserted into an elongated hole 42a formed in the upper frame 3a for supporting the roller 41 a; a roller shaft 43b movably inserted into an elongated hole 42b formed in the upper frame 3a for supporting the roller 41 b; a spring 45a having one end mounted on the roller shaft 43a and the other end mounted on a spring pressing piece 44a provided in the upper frame 3a, and applying a pressing force acting toward the pulley 5 to the roller 41 a; and a spring 45b having one end attached to the roller shaft 43b and the other end attached to a spring pressing piece 44b provided in the upper frame 3a, and applying a pressing force acting toward the pulley 5 to the roller 41 b. A plurality of pulley grooves 41a1, 41b1 are formed in the outer peripheral portions of the rollers 41a, 41b, and the plurality of slings 1 move in sliding contact with the pulley grooves, respectively. The pressing mechanism for applying a pressing force acting in the direction of the pulley 5 to the rollers 41a and 41b is composed of, for example, elongated holes 42a and 42b, spring pressing members 44a and 44b, and springs 45a and 45 b.

In the third embodiment, the slings 41a and 41b supported to be movable are pressed by the pressing means in the direction of the pulley 5 at the sling winding opening portion on one side and the sling winding opening portion on the other side of the pulley 5, and the slings 1 are sandwiched by the rollers 41a and 41b and the pulley 5, whereby the slings 1 can be prevented from coming off from the pulley 5 even when a large external force is applied to the slings 1 due to an earthquake or the like.

According to the third embodiment, since the pressing force generated by the pressing mechanism acts on the hoist rope 1 in the direction of the pulley 5 via the rollers 41a and 41b, even when a large external force acts on the hoist rope 1, the hoist rope 1 can be prevented from coming out of the pulley groove. Further, the pressing force required to reliably prevent the wire 1 from coming out of the sheave groove can be applied to the rollers 41a and 41b, and smooth movement of the wire 1 can be ensured.

Claims (2)

1. An elevator sling falling prevention apparatus provided on a sheave having a sheave groove formed on an outer circumference thereof to prevent a sling wound around the sheave from falling off the sheave, wherein the sheave is rotatably pivotally supported on an upper frame of the elevator,

at least one roller is arranged between the sling winding opening part on one side of the pulley and the sling winding opening part on the other side of the pulley, and the sling slides between the roller and the pulley,

the device for preventing the fall of the sling of the elevator is provided with a pressing mechanism which supports the roller, enables the roller to move and applies pressing force acting towards the direction of the pulley to the roller,

the pressing mechanism is composed of the following parts: an elongated hole formed at the upper frame; a spring pressing member provided to the upper frame; a roller shaft movably inserted into the elongated hole for supporting the roller; and a spring having one end attached to the roller shaft and the other end attached to the spring pressing member, and applying a pressing force acting in a direction toward the pulley to the roller.

2. The sling fall prevention device for an elevator according to claim 1,

at least an outer peripheral portion of the roller has flexibility.