JP2003137484A - Tensile force adjusting device of main rope of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tensile force adjusting device of a main rope of an elevator enabling to easily conduct a preliminary preparing work and subsequent clearing work of main rope tensile force adjustment. SOLUTION: This device is provided with a common plate 20 for engaging a thimble rod 8 of each of the main ropes in an extending direction of a spring member, and a pantograph type jack 14 for driving the plate 13 in the extending direction.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension adjusting device for a main rope of an elevator. 2. Description of the Related Art Conventionally, this type of apparatus is disclosed in
As described in Japanese Patent Application Laid-Open No. 298474/1990, a conventional tension adjusting device for a main rope of an elevator is designed to make the tensions of a plurality of main ropes equal to each other.
No. 72, the thimble rod is kept from turning with a spanner or the like, and the nut that regulates the height of the spring is rotated with another spanner so that the height of the spring is almost the same. After operating the car in this state, it was again checked whether the heights of the springs were equal. If the heights were not equal, the nut was again rotated to adjust the heights of the springs to be equal. [0003] According to the above-mentioned conventional apparatus, a plurality of thimble rods at the end of the main rope can be pulled up. However, the hydraulic jack for lifting the thimble rod is heavy, and it is inconvenient to carry. That is, every time it becomes necessary to raise the thimble rod (when adjusting the tension of the main rope), it is very burdensome to bring the thimble rod to the site where the elevator is installed.
In addition, recent elevators are not provided with a machine room, and are of a type in which a hoist and the like are housed in a hoistway, and a work environment at the time of tension adjustment work of a main rope is deteriorated and scaffolding is reduced. . An object of the present invention is to provide a tension adjusting device for a main rope of an elevator, which can easily perform a preparatory operation for adjusting a tension of a main rope and a post-rolling operation after the fact. SUMMARY OF THE INVENTION The object of the present invention is to connect a car and a counterweight to a thimble rod whose leading end is connected to the tip of a plurality of main ropes suspended from a leading end of the main rope. In a tension adjusting device for a main rope of an elevator, wherein a spring member is interposed between a nut screwed to a rod and the supporting portion, a common plate for engaging each of the thimble rods in a direction in which the spring member extends is provided. This is achieved by providing a pantograph-type jack for driving the plate in the extension direction. As described above, since a lightweight pantograph-type jack is used, it is extremely easy to bring it to the site and to carry it to the place where it is to be worked, and as a result, it is easy to prepare in advance and to work afterwards. Therefore, it is easy to support even a place with poor scaffolding, and it is easy to set it to a predetermined position, and it can also be used for main rope tension adjustment work of a machine roomless elevator. An embodiment of the present invention will be described below with reference to the drawings. FIGS. 3 and 4 are vertical sectional views of an elevator hoistway to which the present invention is applied. In a machine room 2 installed at the uppermost lower part of a hoistway 1, a hoisting sheave 3 and a deflecting wheel 4 are provided. A car 5 and a counterweight 6 are installed in the hoistway 1. The main rope 7 communicating between the car 5 and the counterweight 6 has one end supported on the floor of the machine room 2 via a thimble rod described in detail below. Although the main rope 7 is illustrated as one, a plurality of main ropes 7 are provided in parallel. Next, the detailed structure of the thimble rod 8 supporting the end of the main rope 7 will be described with reference to FIG. 1 showing a state in which a tension adjusting device for a main rope of an elevator according to one embodiment of the present invention is attached. Will be explained. Main rope 7 described above
A thimble rod 8 is provided at an end of the machine room 2 and is led out to the machine room 2 side through a support 2a such as a floor of the machine room 2. A double nut 9 is screwed into the thimble rod 8 on the machine room 2 side.
The spring member 10 is arranged between the positions a. Accordingly, the load applied to the main rope 7 by the car 5 and the counterweight 6 in FIG. 3 is elastically received by the support portion 2a via the spring member 10. In addition thimble rod 8
As shown in FIG. 2, which is a side view of FIG. 1, a nut 11 for preventing rotation of the thimble rod 8 during the operation to be described later is screwed into the end of the nut. It may be provided, or may be provided when adjusting the tension of the main rope 7 described later. Further, the tension adjusting device and the tension adjusting device will be described. As shown in FIGS. 1 and 2, the tension adjusting device includes a plate 13 that engages with a detent nut 11 provided at an end of a thimble rod 8 connected to a plurality of main ropes 7, And a hydraulic jack 14 driven in the extension direction in which the spring force of the member 10 is released. The plate 13 has a substantially L-shaped cross section as shown in FIG. 2, and has a notch into which each thimble rod 8 is inserted. By inserting each thimble rod 8 into the notch 12, the plate 13 is connected to the thimble rod 8 in a direction in which the spring force of the spring member 10 is released. Since the notch is provided in the plate 13, the plate 13 can be immediately engaged with the thimble rod 8 in a steady state. To adjust the tension applied to each of the main ropes 7 equally, the plate 13 is connected to each of the thimble rods 8.
The thimble rods 8 are inserted into the notch grooves 12 while being held at the height position between the double nut 9 and the detent nut 11 and pushed into the thimble rod 8 side. Next, the pantograph 14 set on both sides of the plate 13 is operated, and the plate 13 is lifted in the direction in which the spring member 10 releases the spring force. Move. Then, after loosening the double nut 9 of the thimble rod 8 supporting the main rope 7 having a high tension with a spanner, the double nut 9 is moved by hand to a predetermined height while rotating the double nut 9,
The double nuts 9 are tightened in opposite directions by a wrench to lock the double nuts 9. After this operation, the plate 13 was lowered by operating the pantograph 14, the main ropes 7 were supported via the spring members 10, and the elevator was slightly reciprocated several times, for example, from the top floor to the bottom floor. After that, the length L of the three spring members 10 is almost the same,
That is, it is checked whether the tensions of the main ropes 7 are equal. If each of the spring lengths L exceeds the predetermined size range, the above-described adjustment work and the confirmation after the adjustment are performed again. According to such a tension adjusting device, when adjusting the tension of the main ropes 7 uniformly, the tension can be quickly and easily adjusted, and a spanner having a long handle or the like is prepared to increase the rotational force. No need. Also, the main rope 7
Is supported at the corner in the machine room 2 or
In many cases, there is not enough space around, and even when a spanner having a long handle cannot be used, the tension of the main rope 7 can be adjusted. As described above, according to the present invention, the state in which no compression force is applied to the spring member by lifting the thimble rod, that is, the state in which no force acts on the nut screwed to the thimble rod. , The nut can be turned lightly, and the nut can be quickly and quickly moved to a predetermined position for adjustment. In addition, since a lightweight pantograph-type jack is used, it is extremely easy to bring it to the site and carry it to the place where the work is performed. As a result, preparation in advance and post-treatment work after the fact are facilitated. Further, since the pantograph-type jack is lightweight, it is easy to support it even in a place with a poor scaffold, and it is easy to set the jack at a predetermined position.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a tension adjusting device for a main rope of an elevator according to an embodiment of the present invention. FIG. 2 is a side view of FIG. FIG. 3 is a vertical sectional view of an elevator hoistway to which the present invention is applied. FIG. 4 is a vertical sectional view of an elevator hoistway to which the present invention is applied. [Description of Signs] 2a Supporting portion 5 Car basket 6 Counterweight 7 Main rope 8 Thimble rod 9 Double rod 10 Spring member 13 Plate 14 Pantograph jack

Claims (1)

Claims: 1. A nut connected to a tip of a plurality of main ropes for suspending a car and a counterweight connected to a thimble rod whose end is drawn out on the opposite side of an indicator, and screwed to the thimble rod. And a tension adjusting device for the main rope of the elevator, wherein a spring member is interposed between the support member and the support portion, a common plate for engaging the thimble rods in the extension direction of the spring member, and the plate is moved in the extension direction. A tension adjusting device for a main rope of an elevator, comprising a pantograph-type jack to be driven.