JPH09156850A - Braking device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the stabilized braking force for a long time by providing a rotatable tension sheave, which is to be displaced with a draw of a compensating rope and which presses the compensating rope at a part between a first and a second compensating sheaves. SOLUTION: A tension sheave 13 presses a compensating rope 9 at a part between a first and a second compensating sheaves 6, 7 with a dead weight thereof. When the compensating rope 9 is drawn with the lapse of time, an arm 11 is turned counterclockwise around a supporting point 12, and while a tension sheave 113 is lowered. The tension sheave 13 is gradually lowered in response to the drawn variable of the compensating rope 9, but the tension sheave 13 always continue to apply the tension to the compensating rope 9. With this structure, a required tension can be maintained so as to maintain the stabilized braking force for a long time without operating a tension setting unit 8 till the tension sheave 13 contacts with the first compensating sheave 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator braking device used in, for example, a rope type linear motor elevator.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing an example of a conventional rope type linear motor elevator. In the figure, 1 is a hoistway, 2 is a pulley provided above the hoistway 1, 3
Is a main rope wound around the pulley 2, 4 is a car suspended at one end of the main rope 3, and 5 is a counterweight suspended at the other end of the main rope 3. A linear motor (not shown) on the moving side is mounted on the counterweight 5.

Reference numeral 6 is a rotatable first compensating sheave provided in the pit of the hoistway 1, 7 is a second compensating sheave provided in the pit, and the second compensating sheave 7 is a tension setting device. The portion 8 is movable in the up-down direction, whereby the distance between the first and second compensating sheaves 6 and 7 can be adjusted. 9 is a compensator rope in which both ends are connected to a car 4 and a counterweight 5, and an intermediate portion located in the pit is wound around the first and second compensating sheaves 6 and 7, and 10 is a first compensator. It is a braking device body for braking the pen sheave 6.

Next, the operation will be described. The braking force while the rope type linear motor elevator is stopped is retained by the traction between the first compensating sheave 6 provided with the braking device body 10 and the compensating rope 9. The tension setting unit 8 sets the traction, and adjusts the interval between the first and second compensating sheaves 6 and 7 to ensure the required traction ability.

[0005]

In the conventional rope type linear motor elevator constructed as described above, the main rope 3 and the compensating rope 9 are aged depending on the conditions such as frequency of use, loading capacity and rated speed. And the tension of the compensating rope 9 decreases. Due to this decrease in tension, the traction between the first compensating sheave 6 and the compensating rope 9 decreases, so there is a problem that it is necessary to frequently perform the adjustment by the tension setting unit 8. On the other hand, if adjustment is performed so that excessive tension is applied to reduce the frequency of adjustment, the pulley 2, the main ropes 3, the first and second compensating sheaves 6, 7 and the compensating rope 9 are abnormally worn. There was a problem that it would end up.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an elevator braking device capable of keeping a braking force stable for a long period of time.

[0007]

According to a first aspect of the present invention, there is provided an elevator braking device which is provided in a pit of a hoistway and has a rotatable interval between the two. The first and second compensating sheaves are connected to both ends of a main rope and a car that moves up and down a hoistway and a counterweight are connected at both ends, and the compensator is wound around the first and second compensating sheaves. A rope, a braking device body that brakes at least one of the first and second compensating sheaves, and a rotatable body that displaces with the extension of the compensating rope and presses the compensating rope in the portion between the first and second compensating sheaves. It is equipped with a tension sheave.

In the elevator braking device according to the second aspect of the present invention, an abnormality detection switch that outputs an abnormality detection signal when the displacement amount of the tension sheave reaches a limit, and a car that safely receives the abnormality detection signal are stopped. And a control device for controlling.

In the elevator braking device according to the third aspect of the present invention, the base end is rotatably attached to the hoistway wall,
An arm for supporting a tension sheave is provided at a tip end portion, and a tension adjusting weight attached to an intermediate portion of the arm and having an attachment position adjustable along the longitudinal direction of the arm.

An elevator braking device according to a fourth aspect of the present invention is provided with a separating direction movement preventing means for preventing movement of the tension sheave in the separating direction from the compensating rope.

In the elevator braking device according to the invention of claim 5, a mechanism for allowing the movement of the tension sheave to weaken the tension when abnormal tension is generated in the compensating rope is provided in the opening / closing movement preventing means. It is a thing.

An elevator braking device according to a sixth aspect of the present invention is configured to reduce the pressing force applied to the compensating rope by the tension sheave while the car is traveling.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is a configuration diagram showing a rope-type linear motor elevator braking device according to Embodiment 1 of the present invention. The same or corresponding parts as in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 11 is an arm rotatably mounted on the wall of the hoistway 1 about a fulcrum 12, and 13 is a tension sheave rotatably attached to the tip of the arm 11. This tension sheave 13
The compensating rope 9 in the portion between the first and second compensating sheaves 6 and 7 is pressed by its own weight.

Next, the operation will be described. When the main rope 3 and the compensating rope 9 extend with time, the arm 11 rotates around the fulcrum 12 in the counterclockwise direction and the tension sheave 13 descends. Tension sheave 13
Gradually descends to the position indicated by the chain double-dashed line in the figure in accordance with the amount of extension of the compensating rope 9, but tension is always applied to the compensating rope 9. Therefore, tension sheave 1
The required tension can be maintained and the braking force can be stably maintained for a long period of time without operating the tension setting section 8 until just before the contact of the third compensating sheave 6 with the first compensating sheave 6.

The tension setting section 8 may be adjusted before the tension sheave 13 contacts the first compensating sheave 6, whereby the tension sheave 13 can be reset to the initial position. Therefore, the braking force can be maintained for a long time, and the resetting interval can be greatly extended.

Embodiment 2 FIG. 2 is a configuration diagram showing a braking device for a rope-type linear motor elevator according to Embodiment 2 of the present invention. In the figure, 14 is an abnormality detection switch provided in contact with the arm 11 so as to output an abnormality detection signal when the tension sheave 13 reaches a position requiring resetting, and 15 is an abnormality detection switch 14 that detects an abnormality. The abnormality forecast switch is provided in contact with the arm 11 so as to output the forecast signal before outputting the signal. Other configurations are the same as those in the first embodiment.

In this example, by sending the forecast signal to the maintenance company or the management room, it is notified that the tension setting unit 8 needs to be reset, and the maintainability is improved. When the abnormality detection signal is sent to the control device (not shown), the car 4
Safety is improved because (Fig. 5) is safely stopped at the nearest floor and cannot be restarted until it is reset.

Embodiment 3 3 is a configuration diagram showing a braking device for a rope type linear motor elevator according to a third embodiment of the present invention. In the figure, 16 is an arm 11.
The tension adjusting weight 16 is detachably attached to the intermediate portion of the arm 11, and the attachment position of the tension adjusting weight 16 can be adjusted in the longitudinal direction of the arm 11.

In the first embodiment, it is necessary to prepare several kinds of tension sheaves 13 in advance and select the tension sheaves 13 having a necessary weight according to the loading capacity of the elevator, the lifting stroke and the rated speed. However, according to the apparatus of this example, the required braking force can be obtained by moving the attachment position of the tension adjusting weight 16, and it is possible to deal with the tension sheave 13 of one type.

Embodiment 4 FIG. Next, FIG. 4 is a configuration diagram showing a braking device for a rope type linear motor elevator according to a fourth embodiment of the present invention. In the figure, reference numeral 17 denotes a one-way clutch that is in contact with the arm 11 and serves as a movement preventing means in the opening / closing direction, and is supported by a supporting portion 18 fixed to the hoistway wall. Further, the one-way clutch 17 is displaced following the rotation of the arm 11 in the counterclockwise direction in the figure, but does not move in the opposite direction.

In this example, when a sudden load change occurs due to a passenger getting on or off, the tension sheave 13 tries to move in the direction of separating from the compensating rope 9.
This is prevented by the one-way clutch 17.

The opening / closing direction movement preventing means is not limited to the one-way clutch 17, and may be a damper device using oil or air, for example.

Embodiment 5 In addition, although the support portion 18 is fixed to the hoistway wall in the fourth embodiment, it may be movable up and down. In this case, the support portion 18 is moved upward while the car 4 is running to move the main rope 3 The abrasion of the compensating rope 9 and the sheaves can be suppressed, and the one-way clutch 17 and the support portion 18 can be returned to their original positions only while the car 4 is stopped to maintain the required braking force.

Embodiment 6 FIG. Furthermore, the above-mentioned fourth embodiment
In the above, a mechanism may be provided for moving the support portion 18 by a predetermined dimension when an abnormal tension is generated in the compensating rope 9. Thereby, the first and second compensating sheaves 6,7
When a foreign object is sandwiched between the compensating rope 9 and the compensating rope 9, an abnormal increase in tension can be suppressed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a braking device for a rope-type linear motor elevator according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a braking device for a rope-type linear motor elevator according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a braking device for a rope type linear motor elevator according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a braking device for a rope type linear motor elevator according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing an example of a conventional rope-type linear motor elevator.

[Explanation of symbols]

1 hoistway, 3 main ropes, 4 car, 5 counterweight, 6
1st compensating sheave, 7 2nd compensating sheave, 9 compensating rope, 10 braking device body, 11 arms, 1
3 Tension sheave, 14 Abnormality detection switch, 16
Tension adjustment weight, 17 one-way clutch (separation direction movement prevention means).

Claims (6)

[Claims] 1. A rotatable first and second compensating sheave, which is provided in a pit of a hoistway and is adjustable in space between the two, and is hung from both ends of a main rope. Both ends are connected to a car and a counterweight that move up and down the hoistway, and
And a compensating rope wound around the second compensating sheave, a braking device body that brakes at least one of the first and second compensating sheaves, and the first and second compensating ropes that are displaced as the compensating rope extends. An elevator braking device comprising: a rotatable tension sheave that presses a compensating rope in a portion between compensating sheaves. 2. An abnormality detection switch that outputs an abnormality detection signal when the amount of displacement of the tension sheave reaches a limit,
The elevator braking device according to claim 1, further comprising: a control device that safely stops the car upon receiving the abnormality detection signal. 3. An arm having a base end rotatably attached to a hoistway wall and having a tip end supporting a tension sheave,
3. A tension adjusting weight, which is attached to an intermediate portion of the arm and whose attachment position is adjustable along the longitudinal direction of the arm, according to claim 1 or 2. Elevator braking system. 4. The separation direction movement preventing means for preventing the movement of the tension sheave in the direction of separating from the compensating rope, is provided.
The elevator braking device according to any one of 1. 5. The separation direction movement preventing means has a mechanism for allowing movement of the tension sheave to weaken the tension when abnormal tension is generated in the compensating rope. Elevator braking system. 6. The elevator braking apparatus according to claim 1, wherein the tension sheave reduces the pressing force applied to the compensating rope while the car is traveling.