JP2003128360A - Device for compensating main rope weight balance of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for compensating main rope weight balance capable of effectively utilizing safe operation regions of guide cars when a main rope or a compensating rope is elongated. SOLUTION: For a compensation device 10 of an elevator constituted of the compensating rope 24 and a pair of guide cars 32, 34 for guiding the compensating rope 24, an abutting sheave 50 is placed below the compensating rope 24 wound over the pair of guide cars 32, 34. When the guide cars 32, 34 lower to a predetermined level, the abutting sheave 50 abuts on a part sandwiched by the guide cars 32, 34 of a loop part 49 from downward for lifting up the guide cars 32, 34.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator main rope weight balance compensating device, and more particularly to a compensating rope for weight balancing of a main rope and a guide wheel for guiding the compensating rope. An apparatus comprising: 2. Description of the Related Art Generally, a machine room above a hoistway of an elevator is provided with a hoist for raising and lowering a car of the elevator. The car is connected to the counterweight by a main rope via a hoist. In recent elevators and the like of skyscrapers, the distance the car moves up and down becomes longer, and the length of the main rope increases accordingly.Depending on the position of the car, the weight of the main rope on the car side and the counter weight are increased. Unbalance with the weight of the side. Conventionally, a device for compensating for the imbalance is provided on the floor of the hoistway of the elevator. FIG. 5 is a view showing a configuration of a conventional compensating device 61 provided on a pit floor 59 of a hoistway in order to compensate for the weight balance of a main rope. Compensation device 61
Is composed of a compensating rope 62 and guide wheels 64 and 66 wound around the lower end of the compensating rope 62. The compensating rope 62 has one end connected to the lower end of a car (not shown) and the other end connected to the lower end of a counterweight (not shown). The movement compensates for the imbalance in the weight of the main ropes on the car side and the counterweight side. The guide wheels 64 and 66 pass through the compensation rope 62 in the hoistway.
Is provided to guide the compensating rope 62 so as not to swing in the horizontal direction. The guide wheels 64 and 66 are rotatably supported by a support frame 68. The support frame 68 includes guide rails 70 provided below the pit floor,
It is guided in the vertical direction by 72. [0005] For safe operation of the elevator, upper and lower limits of the movable height of the guide wheels 64 and 66 are set in advance. When the main rope or the compensating rope 62 is entangled, the guide wheels 64 and 66 may rise excessively,
When the position of the guide wheels 64 and 66 is excessively lowered due to breakage or breakage of the main rope or the compensating rope 62, and exceeds the safe operation range defined by the upper limit and the lower limit, the safety device ( (Not shown)) to determine that an abnormality has occurred in the main rope or the compensation rope 62 in the elevator. [0006] The length of the main rope or the compensating rope 62 expands and contracts depending on the number of passengers or a temperature change in the hoistway. When the main rope or the compensating rope 62 is extended, the predetermined lower limit is set to a position substantially higher than the lower limit to be considered as a safe operation. Therefore, there has been a problem that the safe operation range of the guide vehicle is reduced. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object the main rope which can effectively utilize the safe operating range of a guide vehicle when the main rope or the compensation rope is elongated. It is to provide a weight balance compensating device. SUMMARY OF THE INVENTION In view of the above problems, a main rope weight balance compensator according to the present invention comprises an elevator car connected to a main rope via a hoist and a counter weight. A compensating rope connected to the lower end for compensating the balance of the weight of the main rope, and a pair of guides supported movably in the vertical direction and suspended on a loop formed at the lower end of the compensating rope to guide the compensating rope A main rope weight balance compensating device for an elevator comprising: a pair of guide wheels, when the pair of guide wheels descends below a predetermined position, hits the loop portion sandwiched between the pair of guide wheels, and with the downward movement of the tension wheel; It is characterized in that it has a butting sheave for increasing the crossover length of the loop portion. According to the above configuration, even when the main rope or the compensating rope is extended, the butting sheave is sandwiched between the pair of guide wheels when the pair of guide wheels descends below a predetermined position. It hits the loop and increases the crossover length of the loop. By doing so,
The guide vehicle is lifted up to extend the range in which the compensating rope can be lowered as a whole, so that the safe operation range of the guide vehicle can be effectively utilized. Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings. FIG. 1 is a diagram showing a main structure of an elevator in which a weight balance compensating device 10 for an elevator main rope according to an embodiment of the present invention is used. The elevator includes a hoist 14 provided on a floor 12 of a machine room provided above the hoistway, and a car 16 and a counter weight 18 are connected by a main rope 20 via the hoist 14. Is done. On the pit floor 22 below the hoistway, there is provided a main rope weight balance compensating device 10 (compensation device) for compensating the weight balance of the main rope 20 as the car 16 moves up and down. Compensation device 10 includes a compensating rope 24. The compensating rope 24
One end is connected to the lower end of the car 16 and the other end is connected to the counter weight 18, forming a loop below (not shown) as described later. Compensation rope 24
Serves to compensate for the weight imbalance caused by the movement of the main rope 20 by the movement thereof. FIG. 2 is a view showing a compensating apparatus 10 according to an embodiment of the present invention. The compensating device 10 comprises the above-described compensating rope 24, guide wheel unit 26, and butting sheave unit 28. The guide wheel unit 26 includes the support frame 3
0, a pair of guide wheels 32, 34, guide rails 36, 3
And 8. The support frame 30 includes a support plate 4 facing the support frame 4.
0, 42, and side plates 46, 48 provided on the sides thereof. The pair of guide wheels 32 and 34 are spaced apart in the horizontal direction, and the respective rotating shafts 41 and 43 are provided.
Are supported by support plates 40 and 42. The pair of guide wheels 32 and 34 are suspended by a loop 49 formed at one end at the lower end of the car 16 and at the other end at the lower end of the compensating rope 24 connected to the lower end of the counterweight 18. Guide rails 36 and 38 are erected on the pit floor 22 in front of and behind the support frame 30, respectively. Engaging portions 45 having grooves (not shown) for engaging with the guide rails 36 and 38 are provided on the front side of the support plate 40 and on the back side of the support plate 42. Guide rails 36, 3
8, the movement of the support frame 30 is guided vertically. A guide wheel 32 supported by the support frame 30,
34 is also guided in the vertical direction.
The movement of the compensating rope 24 bridged between 2, 34 is restricted in the vertical direction. In this way, it is possible to prevent the compensating rope 24 from swinging in the horizontal direction and generating excessive tension on the compensating rope 24. The butting sheave unit 28 includes a butting sheave 50 and a sheave table 52 for supporting the butting sheave 50. The butting sheave 50 is a loop portion 49, which is located below a portion sandwiched between the guide wheels 32 and 34, and is provided at a predetermined height from the pit floor 22. The sheave table 52 is provided on the pit floor 22 and
0 is rotatably supported. As described above, the guide wheels 32 and 34 are
The support frame 30 and the guide rails 36 and 38 support the movable member in the vertical direction. When the guide wheels 32 and 34 descend to a predetermined height, the butting sheave 50
Abuts on a portion of the loop 49 between the guide wheels 32 and 34 from below. FIG. 3 is a diagram showing the relationship between the guide wheels 32 and 34 and the butting sheave 50. When the guide wheels 32, 34 drop below a predetermined height, the abutment sheave 50 abuts on a portion of the loop portion 49 sandwiched between the guide wheels 32, 34, and curves the abutted portion. As shown in the drawing, when compared with the case where the butting sheave 50 is not provided (see the dashed line in the figure), the crossover length of the loop portion 49 and the portion sandwiched between the guide wheels 32 and 34 is increased. Guide cars 32, 3
The position 4 is pushed upward by Δr. As described in the section of the prior art, for the safe operation of the elevator, the guide wheels 32 and 34 have a predetermined vertical movement range. On the other hand, depending on the number of passengers or the temperature change in the hoistway, the main rope 2
When the length of the compensating rope 24 is zero or the compensating rope 24 is elongated, the actual operating range of the guide wheels 32 and 34 is reduced. In this embodiment, the butting sheave 5
When the guide wheels 32 and 34 are lowered below a predetermined position by providing 0, the compensating rope 24 is bent to push the guide wheels 32 and 34 upward. In this way, even when the compensating rope 24 is extended, the guide wheels 32,
34 can be reduced. Therefore, the safe operation range of the guide vehicle can be effectively utilized. Here, the main rope 20 and the compensating rope 2
4 may be a chain. Also, depending on the application,
A plurality of butting sheaves may be provided. FIG. 4 is a view showing an example of a safety device for determining an operation range of the vertical movement of the guide vehicle. 1 to 3 have the same reference numerals and description thereof will be omitted. The guide vehicle unit 26 is provided with a safety device 51 for safe operation of the elevator. The safety device 51 includes a cam 54 provided on the support plate 42 and a roller 56 provided on the guide rail 38 for rolling on the cam 54.
And a switch mechanism 60 having a rod 58 having a roller 56 at one end. The cam 54 is a plate cam extending in the vertical direction, and its upper and lower ends are chamfered. The rod 58 is always elastically biased toward the support plate 42 side. As the compensating rope 24 moves up and down, the support frame 30 also moves up and down. At this time, the roller 56 attached to the tip of the rod 58 rolls on the cam 54 according to the movement. While the roller 56 is in rolling contact with the cam 54, the switch mechanism 60 is in the ON state, and it is determined that the operation of the compensator 10 is in a safe state.
When the roller 56 falls off from one end of the cam 54, the elastically urged rod 58 tilts toward the support plate 42 (see the dashed line in the figure), and the switch mechanism 60 is turned off. When the switch mechanism 60 is turned off, the state of the compensator 10 is determined to be abnormal. As described above, the vertical movement range of the guide wheels 32 and 34 regarded as the safe operation of the compensator 10 is determined by the length of the cam 54 in the vertical direction. When the main rope 20 or the compensating rope 24 is extended, the initial position of the roller 56 moves upward with respect to the cam 54, and the operating range in which the compensating device 10 is considered safe is narrowed. Therefore, as described above, the abutment sheave 50 is provided, and when the guide wheels 32, 34 drop below a predetermined position, the compensating rope 24 is bent to push the guide wheels 32, 34 upward. In this way, even if the operating range in which the compensating device 10 is regarded as safe is narrowed, the abutting sheave 50 allows the guide wheels 32,
By reducing the degree of downward movement of the guide wheels 32,
It is possible to effectively utilize the 34 safe operation ranges. Here, a safety device having a configuration other than that shown in FIG. 4 is also included in the embodiment of the present invention. According to the present invention, the safe operation range of the guide vehicle can be effectively utilized even when the main rope or the compensating rope is elongated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an elevator including an elevator main rope weight balance compensating device according to an embodiment of the present invention. FIG. 2 is a diagram showing an elevator main rope weight balance compensating device according to an embodiment of the present invention. FIG. 3 is a diagram illustrating an operation of the elevator main rope weight balance compensating device according to the embodiment of the present invention. FIG. 4 is a view showing a safety device provided in the guide car unit. FIG. 5 is a view showing a conventional main rope weight balance compensator for an elevator. [Description of Signs] 10 Main rope weight balance compensator, 14 hoisting machine, 16 riding car, 18 counter weight, 20 main rope, 24 compensating rope, 26 guide car unit, 2
8 Butt sheave unit, 30 support frame, 3
2,34 Guide car, 36,38 Guide rail, 50
Butt sheave, 52 sheaves.

Claims (1)

Claims: 1. A compensating rope connected to each lower end of an elevator car and a counter weight connected by a main rope via a hoist, and compensating for the balance of the weight of the main rope. A pair of guide wheels that are supported movably in the vertical direction, are suspended in a loop formed at the lower end of the compensating rope, and guide the compensating rope. When the guide wheel descends from a predetermined position, the guide wheel hits the loop portion sandwiched between the pair of guide wheels, and includes a butting sheave that increases the crossover length of the loop portion as the tension wheel descends. Elevator main rope weight balance compensator.