WO2002053485A1

WO2002053485A1 - Emergency brake device of elevator

Info

Publication number: WO2002053485A1
Application number: PCT/JP2000/009424
Authority: WO
Inventors: Kazumasa Ito
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2000-12-28
Filing date: 2000-12-28
Publication date: 2002-07-11
Also published as: EP1352869A4; JPWO2002053485A1; EP1352869A1

Abstract

An emergency brake device of elevator, wherein, when a car (7) rises at a speed exceeding a preset speed, a roller (12) is caught between a guide body (11) and a pulley (4a) so as to brake the rotation of the pulley (4a), and the roller (12) is reciprocated between a braking position and a release position along the guide body (11), energized by an energizing means (15) toward the braking position and, normally, held at the release position against the energizing means (15) by the holding means (14).

Description

Booklet Elevator overnight emergency braking system

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency emergency braking device for stopping a rise of a car when the car rises at an abnormal speed.

Background art

In the evening, for example, if a failure occurs in the brake device of the hoisting machine with the weight of the counterweight being larger than that of the car, the car is raised at an acceleration corresponding to the weight difference from the counterweight. However, abnormal speed exceeding the rated speed may be reached.

Conventionally, as a countermeasure when the car rises at an abnormal speed, there are known methods of installing a governor and an emergency stop device on the counterweight side and installing a rope brake that directly grasps the main rope. . However, these methods require sufficient space to install the equipment, may damage guide rails and main ropes, and increase the complexity and cost of the equipment. There were problems such as. In addition, for example, Japanese Patent Application Laid-Open No. 5-193680 describes that a wedge-shaped braking member is pushed between a sheave and its peripheral members so that a main rope is inserted between the sheave and the braking member. A gripping brake device is shown. However, in this structure, there is a time lag between the start of operation and the generation of damping force, and the car's ascending speed increases accordingly. DISCLOSURE OF THE INVENTION ''

The present invention has been made to solve the above-mentioned problems, and is capable of instantly generating a braking force with a simple and compact structure when the car rises at an abnormal speed. The purpose is to obtain an emergency braking device that can safely stop the car.

The emergency braking device according to the present invention is provided at the upper part of the hoistway. A pre-set speed that is provided on an elevator equipped with a rotatable sheave, a main rope wrapped around the sheave, and a cage and a counterweight suspended from the main rope. The above steps stop the car when the car rises, and the guide body facing the outer peripheral surface of the sheave, the braking position biting between the guide body and the sheave, and the release released from the sheave Roller that can reciprocate along the guide body to and from the position, urging means for urging the roller toward the braking position, and holding the roller at the release position against the urging means and preset It is provided with a holding means for releasing the holding of the opening when the car rises at a speed higher than the set speed.

In addition, the emergency braking device for an elevator according to the present invention includes a rotatable sheave provided at an upper part of a hoistway, a main rope wound around the sheave, and a main rope hung on the main rope. It is installed in an elevator equipped with a car and a counterweight, and stops the car when the car rises at a speed higher than a preset speed, and is arranged coaxially with the sheave. And the disk that is in frictional contact with the sheave and rotates with the sheave, the guide body facing the outer peripheral surface of the disk, the braking position that cuts between the guide body and the disk, and the release position that is separated from the disk. A roller that can reciprocate along the guide body, a biasing means that biases the roller toward the braking position, and a roller that is held at the release position against the biasing means and has a preset speed or more. The basket rises Holding means for releasing the holding of the opening when the contact is made. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a configuration diagram showing an elevator having an emergency brake device according to Embodiment 1 of the present invention,

FIG. 2 is a configuration diagram showing an enlarged main part of FIG. 1,

FIG. 3 is a sectional view taken along the line I I I—II I I of FIG.

FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3,

Figure 5 is a front view showing the rollers in Figure 2,

FIG. 6 is a side view showing the opening of FIG. 5,

FIG. 7 is a sectional view of an emergency brake device according to Embodiment 2 of the present invention,

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Embodiment 1

FIG. 1 is a configuration diagram showing an elevator having an emergency braking device according to Embodiment 1 of the present invention, FIG. 2 is a configuration diagram showing an enlarged main part of FIG. 1, and FIG.

FIG. 4 is a cross-sectional view taken along a line IV-IV in FIG. 3.

In the figure, a machine room 2 is provided above a hoistway 1. In the machine room 2, a machine table 3 is installed. The machine stand 3 is equipped with a hoist 4 and a deflector 5. A main rope 6 is wound around the drive sheave 4 a and the deflector wheel 5 of the hoisting machine 4. A car 7 is suspended from one end of the main rope 6. A counterweight 8 is suspended from the other end of the main rope 6.

An emergency brake device 9 is mounted on the machine base 3 to brake the drive sheave 4a and stop the car 7 when the car 上昇 rises at a speed higher than a preset speed. The emergency brake device 9 is composed of a guide body 1 1, a guide body 1 facing the outer peripheral surface of the drive sheave 4a.

Roller 1 2 which can reciprocate along 1, plunger 13 connected to roller 12, solenoid coil 14 as a holding means surrounding plunger 13, and plunger 13 and solenoid coil 14 Spring as biasing means disposed between

Has 15

The roller 12 is moved between a braking position (shown by two-dot chain line in FIG. 4) between the guide body 11 and the drive sheave 4a and a release position (solid line in FIG. 4) separated from the drive sheave 4a. Reciprocating between The spring 15 urges the roller 12 toward the braking position.

When energized, the solenoid coil 14 attracts the plunger 13 so as to hold the roller 12 at the release position against the spring 15. When the car 7 rises at a speed higher than a preset speed, the power supply to the solenoid coil 14 is cut off, and the suction to the plunger 13 is released.

FIG. 5 is a front view showing the rollers of FIG. 2, and FIG. 6 is a side view showing the rollers of FIG. Roller

The outer peripheral surface of 12 is roughened to increase the coefficient of friction. As a result, a sufficient braking force against the drive sheave 4a is secured. Next, the operation will be described. The traveling speed of the car 7 is constantly detected by, for example, an encoder (not shown) provided in the hoisting machine 4. If the traveling speed of the car 7 is normal, the roller 12 is held at the release position by the electromagnetic force of the solenoid coil 14.

However, when the rising speed of the car 7 exceeds the rated speed and reaches a preset speed for some reason, the energization of the solenoid coil 14 is cut off and the pressing force of the spring 15 causes the roller 12 to It is moved to the braking position. At this time, the car 7 is raised, and the drive sheave 4a is rotating clockwise in FIG. 4, so that the rollers 12 bite between the guide body 11 and the drive sheave 4a. It is. As a result, the rotation of the drive sheave 4a is immediately stopped.

According to such an emergency brake device 9, when the car 7 rises at an abnormal speed, a braking force can be immediately generated with a simple and compact structure, and the car 7 can be safely stopped.

Here, the abnormal speed when ascending is different from that when falling, and is accelerated slowly due to the weight difference between the car 7 and the counterweight 8, and the like. For this reason, if the set speed is set lower, the car 7 can be stopped before the high speed is reached, so that the emergency braking device 9 of the early type can be used, and the structure is simple and compact. It can be made into a bird.

The emergency brake device 9 can also be operated when the car 7 has landed and stopped, thereby preventing the failure of the brake device (not shown) of the hoisting machine 4 during the arrival of the car 7! It is also possible to prevent the car 7 from rising due to the above.

Furthermore, since the braking device of the hoisting machine 4 and the emergency braking device 9 form a double brake, the weight of the counterweight 8 is larger than that of the car 7 (normally, when there is no load in the car 7). The counterweight 8 is heavier), the emergency brake device 9 is operated, and the brake device of the hoisting machine 4 can be disassembled to perform maintenance work, thereby improving the workability of maintenance work. . Embodiment 2

Next, FIG. 7 is a sectional view of the emergency brake device according to the second embodiment of the present invention. FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. In the figure, a ring-shaped disk 16 is in frictional contact with the end surface of the drive sheave 4a. The disk 16 is arranged coaxially with the drive sheave 4a and is rotated together with the drive sheave 4a. The disk 16 is sandwiched between the ring-shaped holding plate 17 and the drive sheave 4a. A plurality of bolts 18 penetrating the holding plate 17 are screwed to the end surface of the drive sheave 4a. A spring 19 for pressing the disc 16 against the drive sheave 4a via the holding plate 17 is disposed between the head of each port 18 and the holding plate 1Ί. The frictional force between the disk 16 and the sheave 4a is adjusted by the amount of the bolt 18 tightened.

The emergency brake device 20 according to the second embodiment includes a guide body 11, a roller 12, a plunger 13, a solenoid 14, a spring 15, a disk 16, a holding plate 17, a bolt 18, and a spring 1. Has 9 Other configurations are the same as those of the first embodiment. _C In such an emergency braking device 20, the roller 12 bites between the disk 16 and the guide body 11 during operation, and the disk 16 Is stopped immediately. However, since the disc 16 and the drive sheave 4a are in frictional contact, the drive sheave 4a is not stopped immediately, but receives a braking force according to the frictional force, and is decelerated to stop. .

Therefore, even when the ascending speed of the car 7 exceeds the allowable speed that may be stopped immediately, the car 7 can be safely stopped with a constant braking force. In the first and second embodiments, the rollers 12 are arranged so as to stop the rotation of the drive sheave 4a in the direction in which the car 7 is rising, but in addition to this, the car 7 A brake device having rollers that stop the rotation of the drive sheave 4a in the direction of descending may be added.

As a result, it is possible to prevent the car 7 from lowering due to a failure of the brake device of the hoisting machine 4 while the car 7 is landing on the floor. Also, regardless of the weight balance between the car 7 and the counterweight 8, the rotation of the drive sheave 4a in both directions can be restricted, and the brake device of the hoisting machine 4 can be disassembled for maintenance work. Therefore, the workability of the maintenance work can be improved.

In Embodiments 1 and 2, a device for braking the rotation of the drive sheave 4a, which is a sheave, is provided. As shown, if the friction force between the sheave deflector wheel 5 and the main rope 6 is sufficiently high and braking of the deflector wheel 5 can stop the rise of the car 7, the deflector wheel 5 It is also possible to apply an emergency braking device.

Further, in the first and second embodiments, the solenoid coil 14 is shown as the holding means. However, for example, a holding mechanism for mechanically holding and releasing the roller 12 at the release position may be used.

Claims

The scope of the claims

1. A rotatable sheave provided at the top of the hoistway, a main rope wound around the sheave, and a basket and a counterweight suspended from the main rope.エレ An emergency brake device that is provided at night and stops the car when the car rises at a speed higher than a preset speed,

A guide body facing the outer peripheral surface of the sheave;

A roller that can reciprocate along the guide body between a braking position that bites between the guide body and the sheave and a release position that is separated from the sheave;

Biasing means for biasing the opening toward the braking position; and

A holding means for holding the roller in the release position against the urging means and releasing the holding of the opening when the car rises at a speed higher than a preset speed.

Elevator overnight emergency braking device equipped with.

2. A rotatable sheave provided at the top of the hoistway, a main rope wound around the sheave, and a car and a counterweight suspended from the main rope. An emergency brake device for stopping the car when the car rises at a speed higher than a preset speed,

A disk arranged coaxially with the sheave, in frictional contact with the sheave, and rotated with the sheave;

A guide body facing the outer peripheral surface of the disc,

An opening that can reciprocate along the guide body between a braking position where the guide body and the disk are engaged and a release position that is released from the disk;

Biasing means for biasing the opening toward the braking position; and

Elevator overnight emergency braking device equipped with.

3. It further includes a bolt screwed into the sheave, and a spring provided between the sheave and the bolt for pressing the disk against the sheave, and fastening the bolt to the sheave. 3. The emergency brake device according to claim 2, wherein the frictional force between the disc and the sheave is adjusted by the amount of the engagement.

4. A plunger is connected to the opening, the holding means is a solenoid coil for sucking the plunger, and the urging means is disposed between the plunger and the solenoid coil. The emergency braking device according to any one of claims 1 to 3, wherein the emergency braking device is a spring.

5. The emergency brake according to any one of claims 1 to 4, wherein the sheave is a drive sheave provided on a hoist that raises and lowers the car and the counterweight. apparatus.