JPS6218610Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention is used in a hoisting elevator, etc., which is wound in parallel around a hoist sheave, supporting a car at one end and supporting a counterweight at the other end. When tensioning multiple hoisting ropes (main ropes),
The present invention relates to a rope tension equalization device used to equalize the tension of each hoisting rope, that is, to equalize the load shared by each rope.

[Technical background of the invention and its problems]

Generally, multiple hoisting ropes (approximately 3 to 5 ropes) are installed in parallel in a hoisting elevator, but if the tension of each hoisting rope is uneven, the load shared by each rope will be different and sag may occur. This causes more slips in the grooves of the sheave of the hoist, which causes vibrations to the car, and uneven wear of the sheave grooves, which increases the size of the slips. Various problems arise, including increased wear on the rope, which significantly shortens its life.

By the way, to explain the conventional elevator hoisting rope tensioning work with reference to FIG. A required number of hoisting ropes 4 are wound in parallel around the sheaves 3 of the hoisting machine installed in the machine room at the upper end of the road,
One end of each hoisting rope 4 is connected and fixed to the upper part of the car frame of the car 1 through a rope shaft 5a, and in this state, a worker pulls the other end of each hoisting rope 4 at the lower part of the hoistway. At the same time, a counterweight 2 is placed on the other end of each hoisting rope 4.
Attach marks 6 to match the level near the upper end, cut off the excess portion of the other end of each hoisting rope 4 from each mark 6, and then balance the other ends of each hoisting rope 4. It is connected to a rope shackle 5b provided on the weight 2 and stretched.

However, in the above-mentioned conventional work method, even if the worker pulls the other end of each hoisting rope 4, each rope 4 has bends such as twists and curls, and the tension is applied uniformly to all of the ropes. can't hang down,
For this reason, each hoisting rope 4 cannot be marked with a mark 6 at the correct position, so it is cut into various lengths, and the tension state of each rope 4 when tensioned becomes uneven, resulting in the above-mentioned problem. occurs.
Therefore, in reality, each rope shackle 5b is threaded, and each rope shackle 5b is threaded.
By adjusting the protrusion length of b by changing the degree of tightening of the nut 7, the tension condition of each hoisting rope 4 was equalized, but this adjustment work not only takes a lot of time, but even an experienced person can It is very troublesome and difficult to make sure that all the tensions of the ropes 4 are equalized, and there is a problem that the workability is extremely poor.

Although FIG. 1 above shows the case of an elevator with 1:1 roping, the same problem as described above also exists in an elevator with 2:1 roping as shown in FIG. That is, in this case, one end side of the plurality of hoisting ropes 4 wound in parallel around the sheave 3 of the hoisting machine in the machine room at the upper end of the hoistway is passed through the car sheave 8 at the upper part of the car 1 to the machine room. The hoisting rope 4 is fixed to the fixed beam 9 via the rope shaft 5b, and the other end of the hoisting rope 4 is fixed to the fixed beam 11 in the machine room via the weight sheave 10 above the counterweight 2 in the case of Fig. 1. Although they are oriented upside down, they are each pulled, cut with a mark 6, and fixed with a rope shackle (not shown). For this reason, the correct marks 6 could not be made due to twisting, bending, slack, etc. of each hoisting rope 4, and it was troublesome and difficult to obtain uniform tension with all the ropes having the same length, as in the case of FIG.

[Purpose of invention]

This idea was created in view of the above circumstances, and when tensioning multiple hoisting ropes in parallel, it is extremely important to make the tension of each hoisting rope uniform and mark the correct length of the rope. The purpose of the present invention is to provide a rope tension equalization device that can be easily and reliably made.With this device, each hoisting rope can be easily and evenly tensioned by cutting and connecting from the correct mark position. It's about doing.

[Summary of the invention]

The elevator rope tension equalization device of this invention is provided with a fixed pulley on a frame that can be pulled by connecting a weight or a chain block, and connected to both ends of a rope or chain wound around this fixed pulley. A pair of movable pulleys are provided so that they can move up and down, and a connecting rope or chain is provided around each of the movable pulleys, and both ends of each connecting rope or chain are fixed to each hoisting rope. By connecting the end side that is not connected and pulling it with the weight or chain block,
The same tension can be applied to each hoisting rope.

[Example of idea]

An embodiment of this invention will be described below with reference to FIG. 3 and subsequent figures. Components in the figure that have the same configuration as those in FIGS. 1 and 2 are given the same reference numerals to simplify the explanation.

Here, first of all, 12 in FIGS. 3 and 4 shows the rope tension equalizing device of this invention, of which FIG. 3 is a front view and FIG. A hook 14 on which a weight or a chain block, which will be described later, can be hung is attached to the upper center of the upper end plate of the frame 13, which is shaped like a box frame, with a bolt 15. bracket 16
A fixed pulley 17 is rotatably supported on this at an angle of 45 degrees when viewed from the front. Further, a rope 18 is wound around the fixed pulley 17, and rope sockets 19 and 20 are fixed to both ends of the rope 18. Each of these rope sockets 19, 20 has an inverted U-shape at its lower part, and a movable pulley 21, 22 is rotatably attached to each of the rope sockets 19, 20, respectively. In addition, the shaft 2 of the double moving pulleys 21 and 22
1a and 22a are rope sockets 19 and 2, respectively.
0, and both end portions thereof are vertically movably fitted into vertical holes 13a and 13b formed in front and rear parallel on both side plates of the frame 13. In other words, the pair of movable pulleys 21 and 22 are provided so as to be movable up and down relative to each other via the rope 18 of the fixed pulley 17 in a state where they are shifted back and forth and left and right and do not collide with each other. In addition, each movable pulley 21, 22 has connecting ropes 23, 2.
4 is wound one by one, and each of the connecting ropes 23 and 24 has a winding rope 4 at both ends thereof.
Clips 25 are attached one by one in order to connect them to each other.

Now, to describe a method for equalizing the tension when tensioning the hoisting rope 4 of an elevator using the tension equalizing device 12 having the above-described structure, first, FIG. In the case of a single-roping hoisting elevator, as described in FIG. The tension equalizing device 12 of this invention is suspended in the vicinity of the counterweight 2 disposed at the lower end of the hoistway as shown in the figure, and in this state, the tension equalizing device 12 of this invention is carried into the lower part of the hoistway, and it is installed as shown in FIGS. 4. Contrary to the state shown in Figure 4, the ropes are lifted upside down, and both ends of the tethering ropes 23 and 24 wrapped around the movable pulleys 21 and 22 are individually held with the clips 25 for each of the above-mentioned hoisting operations. Connect to the other end of the rope 4. In this state, hook the upper end of the chain block 26 onto the hook 14 facing below the frame 13, and pull the lower end onto the building fixing part 27 at the lower end of the hoistway via an appropriate hook 28 such as a rope. Multiply. In this condition, the chain block 2
I'm going to operate 6 to make me nervous.

For example, to make the explanation easier to understand, let's start with a case where there are four hoisting ropes 4.
Connecting ropes 23, 24 wrapped around 1, 22
One hoisting rope 4 is connected to each end of the. Here, the fixed pulley 17 moves downward together with the frame 13 due to the tension of the chain block 26, and both movable pulleys 21 and 22 are pulled downward via the rope 18 wrapped around the fixed pulley 17. , tension begins to be applied to both ends of each of the connecting ropes 23 and 24 and the hoisting rope 4 connected thereto. As a result, both movable pulleys 21 and 22 rotate toward the end of the connecting ropes 23 and 24, which has the smaller tension, and the rope 2
At the same time, while making the tension on both ends of 3 and 24 equal,
The fixed pulley 17 rotates with respect to the rope 18 toward the side where the tension is smaller at both ends of the rope 18.
In other words, the tension on both ends of the pulleys 21 and 22 are moved up and down relative to each other to equalize the downward tension. In this way, the fixed pulley 17 and the double movable pulleys 21, 2
By operating the chain block 26 until the rotational movement of the four hoisting ropes 4 stops, the tensions of the four hoisting ropes 4 become uniform.

In this state, equal marks 6 are attached to all of the hoisting ropes 4 based on the height level of the rope shackle 5b on the top of the counterweight 2, and then the chain block 26 is loosened to remove the ropes from each clip 25. The hoisting rope 4 is removed and the tension equalizing device 12 is removed. Subsequently, each of the hoisting ropes 4 is cut to the correct length based on the mark 6, and each cut end is connected to the rope shackle 5b of the counterweight 2 by bibending or the like. The fixation of the car 1 is released and the hoisting rope 4 is placed under the proper load, and adjustment is made by tightening or loosening each nut 7 so that each mark 6 is aligned at the same level. With the above, the tension of each hoisting rope 4 becomes completely uniform.

Next, FIG. 6 shows the case of the 2:1 roping hoisting elevator shown in FIG. In addition to providing electrical continuity above the fixed beam 11 in the machine room, a chain block 26 is connected to the building fixing part 29 such as a U bolt on the ceiling of the machine room.
Hook the upper end of the rope tension equalizing device 12 of this invention to the lower end of the chain block 26 with the hook 14 in the upward position shown in FIGS. 3 and 4.
The connecting ropes 23 and 24 hanging from the movable pulleys 21 and 22 are connected to the hoisting rope 4 one by one by holding both ends of the connecting ropes 23 and 24 with clips 25, respectively. In this state, by operating the chain block 26 to apply a pulling force, the fixed pulley 17 and the pair of movable pulleys 21 and 22 rotate as described above, and the tension on all the hoisting ropes 4 is equally distributed. Then, mark 6 equally on each hoisting rope 4, then loosen the chain block 26 and remove it and the tension equalizing device 12, and then cut each hoisting rope 4 based on the mark 6 and attach it to the fixed beam 11. Although not shown, tensioning of the hoisting rope 4 can be completed by fixing it via a rope shackle, and as described above, each hoisting rope is adjusted by adjusting the nut of each rope shackle so that each mark 6 is all at the same level. The tension of all the ropes 4 can be made uniform. In this case, depending on how the rope shaft is attached to the fixed beam 11, the mark 6 may be cut off, so it is also possible to attach marks 6' below the fixed beam 11. It will be done.

In the above embodiment, the case where there are four hoisting ropes 4 has been described, but in the case where there are three hoisting ropes, the connecting ropes 23 and 24 wound around the double movable pulleys 21 and 22 may be used.
Three of the two ends of the hoisting rope 4 are connected to the hoisting rope 4, and the remaining one is connected to a rope other than the hoisting rope provided in the building, or the remaining one is connected to the hoisting rope 4, or the remaining one is connected to the hoisting rope 4, or the remaining one is connected to the hoisting rope
This is done by fixing it to the frame 13 of No. 2.
If there are five or more hoisting ropes 4, first mark only four as described above, then add additional markings by combining the remaining ropes that were not marked with the previously marked ropes. Divide it into two sessions as instructed.

In addition, in the above embodiment, the fixed pulley 17 and the movable pulley 2
Although the ropes 18, 23, 24 are wound around the ropes 1, 22, a chain may be used instead of the ropes. In this case, the fixed pulley 17 and the movable pulleys 21, 22 are sprocket-shaped.

Although the chain block 26 was used to further apply a tensile force, a weight (not shown) may be used in addition to the chain block 26.

[Effect of idea]

Since this invention was developed as described above, when tensioning multiple hoisting ropes in parallel, each hoisting rope, which has twists and slack, is kept under uniform tension so that the correct rope length can be determined. Not only can it be extremely easy and reliable to mark the positions, but by using each mark as a reference, it is very easy to adjust the tightening of the rope shaft nut, and the tension on all hoisting ropes can be made uniform. This makes it possible to prevent slipping of specific ropes and uneven wear of the sheave grooves, which greatly helps in obtaining an elevator with a comfortable ride.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the marking state when the hoisting rope is stretched in a general 1:1 roping elevator, and Fig. 2 is a schematic diagram showing the marking state when the hoisting rope is tensioned in a 2:1 roping elevator. Fig. 3 is a front view of a rope tension equalizing device showing an embodiment of this invention, Fig. 4 is a side view of the same, and Fig. 5 is a device for equalizing the tension of a hoisting rope of a 1:1 roping elevator. An explanatory diagram of the state in which it is used, Figure 6 shows the same device as above.
1 is an explanatory diagram of a state in which the hoisting rope of a roping elevator is used to equalize the tension. 1... Car, 2... Counterweight, 3...
Hoist sheave, 4...Hoisting rope, 5a, 5
b...Rope shaft, 6, 6'...Mark, 7
... Nut, 8 ... Car sheave, 9, 11 ... Fixed beam, 10 ... Weight sheave, 12 ... Rope tension equalization device, 13 ... Frame, 13a, 1
3b... Vertical hole, 14... Hook, 15... Bolt, 16... Bracket, 17... Fixed pulley, 18
...Rope, 19,20...Rope socket, 2
1, 22... Moving pulley, 21a, 22a... Moving pulley shaft, 23, 24... Connecting rope, 25... Clip, 26... Chain block, 27, 29
...Building fixing part, 28...Latching tool.

Claims (1)

[Scope of utility model registration request] A frame to which a weight or chain block is connected, a fixed pulley provided on this frame, and a pair of movable pulleys connected to both ends of a rope or chain wound around this fixed pulley so as to be able to move up and down relatively. and a connecting rope or chain that is wound around these movable pulleys and connected to the other end of the hoisting rope.