JP4433749B2 - Rope brake device - Google Patents

Description

  The present invention relates to an improvement of a rope brake of an apparatus, for example, an elevator apparatus, including a plurality of main ropes wound around a sheave and reciprocatingly moving a car and the like, and a rope brake that restrains these main ropes.

  FIG. 3 is a drive device provided with a drive mechanism of the system proposed by the applicant (see Patent Document 1), and FIG. 4 is an example of an elevator using this drive device. In the figure, reference numeral 10 denotes a hoistway, in which a car 1, guide sheaves 11 and 12, counterweight 2, a suspension sheave 21, a driving device 40, a sheave 42, and the like are arranged. 3 is a main rope, and the rope ends 31 and 32 are fixed to the fixed side of the hoistway through the sheaves 21, 42, 11, and 12. Reference numeral 13 is a landing door, 14 is a beam provided with a driving device 40, 15 is a guide rail for the counterweight 2, and a guide rail for the car 1 is not shown.

  The drive device 40 attaches a sheave 42 to a frame 41, and arranges pulleys 43, 44, 45 at three locations above and on both sides of the sheave 42, and stretches a belt 46 around these pulleys 43, 44, 45, The main rope 3 wound around the sheave 42 is pressed against the sheave 42 by the belt 46. The upper pulley 43 is connected to a motor (not shown) attached to the back surface of the frame 41, and the car 1 is moved up and down by moving the sheave 42 and the main rope 3 by the circumferential movement of the belt 46. Yes. The pulleys 44 and 45 on both sides are attached to the frame 41 by the position adjusting mechanism 47 so that the height position can be adjusted. By adjusting the height position, the tension of the belt 46 can be adjusted. Can do. 48 is a rope brake that clamps the main rope 3 in an emergency or the like, and operates by hydraulic pressure or the like. Reference numeral 49 denotes a detection device that detects the rotation state of the motor, for example, a rotary encoder.

In this driving device 40, when the belt 46 is loosened or cut, if the unbalance between the car 1 and the counterweight 2 is large, the car 1 or the counterweight 2 may fall (the other will rise). For this reason, when an abnormality is detected, the rope brake 48 is operated to hold the main rope 3. If the holding force of the rope brake 48 is sufficient, the car 1 and the counterweight 2 can be reliably stopped even if the unbalance between the car 1 and the counterweight 2 is large.
International Publication No. 02/064482 Pamphlet

  The rope brake 48 may be installed on the car 1 side of the sheave 42, or may be installed on the counterweight 2 side of the sheave 42. However, these installation methods have the following problems.

  When the rope brake 48 is installed on the counterweight 2 side, as shown in FIG. 4, the suspension sheave 21 is provided on the upper portion of the counterweight 2. That is, the lifting / lowering stroke of the counterweight 2 is shortened. Therefore, it is necessary to raise the installation position of the drive device 40 or lower the hoistway bottom in order to secure the hoisting process, but this causes a problem that the size of the hoistway 10 must be increased.

On the other hand, when the rope brake 48 is installed on the car 1 side, a problem of rope draw occurs. As shown in FIG. 5, which is a schematic plan view of FIG. 4, the guide sheave 11 and the sheave 42 of the car 1 are arranged with an angle of approximately 90 degrees. Therefore, the arrangement of the main rope 3 is twisted by 90 degrees, and the main rope 3 is arranged obliquely at the position of the rope brake 48 as shown in FIG. This phenomenon is particularly noticeable when the car 1 is in the raised position.
When the rope brake 48 is operated in this state, the movable portion 48a moves to the left in FIG. 6, and the main rope 3 is pressed against the brake shoe 61 on the fixed portion 48b side by the brake shoe 60 on the movable portion 48a side. . At this time, the main rope 3 (3a, 3b, 3c) is easily damaged because the strong clamping force acts with the largest amount of movement of the main rope 3a far from the brake shoe 61 on the fixed portion 48b side, and the other main ropes 3b, There was a possibility that the lifetime would be shortened compared to 3c.

  In the present invention, the brake shoes 60 and 61 are configured to be rotatable, and the damage to the main ropes 3a, 3b, and 3c when the main rope is clamped is distributed.

  According to the present invention, since the damage of the main ropes 3a, 3b, 3c can be dispersed when the main rope is clamped, it is possible to prevent only the life of the specific main rope from being shortened.

An embodiment of the present invention will be described with reference to FIGS. 1 and 2, which corresponds to FIG. In the figure, reference numeral 70 denotes a guide provided on the movable portion 48a side, and guide grooves 71 are provided on the upper and lower sides, and upper and lower guide elements 72 fixed to the movable portion 48a are inserted into the guide grooves 71 to support the guide 70. is doing. 73 and 74 are guide rollers pivotally attached to the movable part 48a. The guide 70 is guided by guide rollers 73 and 74 and is rotatable. 75 is a brake shoe.
Reference numeral 80 denotes a guide on the fixed portion 48b side, which includes an upper and lower guide groove 81, upper and lower guide elements 82, guide rollers 83 and 84, and a brake shoe 85, similarly to the movable portion 48a side. Further, in the plane perpendicular to the longitudinal direction of the main rope 3, the left and right guides 70, 80 are combined to be circular and turnable.

  When the rope brake 48 is actuated, the left and right guides 70 and 80 rotate according to the inclination of the main ropes 3a, 3b and 3c to sandwich the main ropes 3a, 3b and 3c. For this reason, substantially the same force is applied to each main rope 3a, 3b, 3c, and it can prevent that only the lifetime of a specific main rope becomes short.

In the embodiment described above, the guide grooves 71 and 81 are provided above and below the guides 70 and 80. However, dovetail guide grooves may be provided on the side surfaces of the guides 70 and 80. The guide rollers 73, 74, 83, and 84 are not limited to a pair, and a large number of rollers may be arranged in an arc.
In the above description, the case where the driving device 40 is disposed in the hoistway 10 has been described. However, any type of elevator can be used as long as rope draw occurs.

It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows the conventional drive device. It is an example of the elevator which uses the drive device of FIG. FIG. 5 is a schematic plan view of FIG. 4. It is a top view of a rope brake.

Explanation of symbols

1 basket 2 counterweight
3, 3a, 3b, 3c Main rope 40 Drive device 48 Rope brake 48a Movable part 48b Fixed part 70, 80 Guide 71, 81 Guide groove 72, 82 Guide 73, 74, 83, 84 Guide roller 75, 85 Brake shoe

Claims (1)

In what has a plurality of main ropes wound around a sheave to reciprocate a car etc. and rope brakes that restrain these main ropes,
The rope brake includes a pair of brake shoes that sandwich the main rope, and both the brake shoes are rotatable about a region sandwiched between the two brake shoes in a plane perpendicular to the length of the main rope. A rope brake device that is configured.

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