JP2001294385A - Hoisting machine device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simply structured hoisting machine device for an elevator having holding braking ability in a car stopping time and emergency braking ability in a car emergency stopping time. SOLUTION: A main rope suspending the car is engaged with a sheave, a hoisting machine 1 driving the sheave for lifting/lowing the car is arranged, and a slowing braking machine 4 braking rotation of a rotating body 3 interlocking with the sheave so as to reduce a lifting/lowering speed of the car by a deceleration speed not physically affecting a passenger inside the car is provided. A holding braking machine 8 actuated after operation of the slowing braking machine 4 so as to brake the rotating body 3 and holding the stopped car is arranged. In this way, the slowing braking machine 4 is operated firstly in an emergency stopping time and the like so as to decelerate the car, and then, the holding braking machine 8 is operated so as to hold the car in a stopping position without rapidly decelerating it. Therefore, a characteristic of the slowing braking machine 4 becomes independent of a holding torque condition and designing can be carried out easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator hoist apparatus for driving a sheave on which a main rope engaged with a car is wound and for raising and lowering the car.

[0002]

2. Description of the Related Art Conventional hoisting machines for elevators include:
A sheave is fitted with a main rope that suspends the elevator car. A brake is also provided that is used both for holding the car when stopped and for braking when the car is emergency stopped, and brakes the rotating body associated with the sheave to which the main rope is engaged. In order to hold the car when the car is stopped, the brake is required to have a braking force capable of preventing the car from moving up and down with respect to the load of the car which has a sufficient capacity. Further, for braking during an emergency stop of the car, the braking force is limited so as to decelerate the ascending and descending of the car by a deceleration having no physical effect on the passengers of the car.

[0003]

In the conventional elevator hoisting apparatus constructed as described above, the conflict between the braking capacity for holding the car at the time of stopping and the emergency braking capacity at the time of the emergency stopping of the car. Must be satisfied. For this reason, it is necessary to strictly manage and maintain the braking torque, which increases the cost. In addition, if the required braking capacity for holding is secured, and the weight of the car is reduced and the size of the motor of the hoist is reduced, the inertial load will decrease, so the deceleration of the car during an emergency stop will be reduced. Will increase. For this reason, there has been a problem that it is difficult to reduce the weight and size of the hoist.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has a simple structure and a required braking capacity for stopping a required car and an emergency braking capacity for emergency stopping of a car. It is an object of the present invention to obtain an elevator hoisting device having the following.

[0005]

In an elevator hoist apparatus according to the present invention, a sheave is engaged with a main rope that suspends an elevator car, and the car is moved through the sheave. A hoist that raises and lowers, a slow brake that operates when necessary to brake the rotation of the rotating body associated with the sheave and decelerates the raising and lowering of the car by a deceleration that does not physically affect the passengers in the car, And a holding brake which operates after the operation of the slow braking to brake the rotation of the rotating body and holds the stopped car.

Further, in the elevator hoist apparatus according to the present invention, the masses of the armatures and the spring constants of the coil springs provided for the slow brake and the holding brake are made different from each other, and the operation time is reduced. Due to the difference in the mechanical time constant in the above, the holding brake operates after the operation of the slow brake.

In the elevator hoist apparatus according to the present invention, there is provided a control device which is connected to the holding brake via the time limit operation device and operates the holding brake after the slow braking is operated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 to 5 are views showing an example of an embodiment of the present invention. FIG. 1 is a side view of a hoist, FIG. 2 is a perspective view showing an enlarged right end side of the hoist of FIG. 3 is a right side view of a main part of FIG. 1, and FIG. 4 is an enlarged vertical sectional view of the main part of FIG. FIG. 5 is a graph showing an operation state of the brake of the hoist of FIG. In the figure, 1 is a hoist, 2 is a sheave fixed to the output shaft of the hoist 1, and although not shown, a main rope suspending a car of an elevator is wound around the sheave.

Reference numeral 3 denotes a rotating body which is provided on the base of the hoisting machine 1 and comprises a brake disk mounted in association with the sheave 2;
Reference numeral 4 denotes a slow braking device mounted on a base of the hoisting machine 1, which is provided with an armature 5, a coil spring 6, and an electromagnetic coil 7,
It is arranged at a position corresponding to the edge of the rotating body 3. Reference numeral 8 denotes a holding brake, which is mounted on the base of the hoisting machine 1 and disposed on a concentric circle at the position where the creeping brake 4 is disposed so as to correspond to the edge of the rotating body 3. Like the motive 4, an armature, a coil spring, and an electromagnetic coil are provided.

In the elevator hoisting apparatus constructed as described above, the slow brake 4 and the holding brake 8 are manufactured such that the mass of the armature 5 and the value of the spring constant of the coil spring 6 are different from each other. This creates a difference in the mechanical time constant during operation. Then, when the excitation voltage to the two electromagnetic coils 7 is simultaneously reduced to zero at the time of an emergency stop of the car or the like, first, the slow brake 4 is operated to rotate the rotating body 3.
Brake. This causes the car to immediately start decelerating.

At this time, the braking torque of the slow brake 4 is set to a value at which no rapid deceleration acts on the car, that is, a value corresponding to a deceleration that does not physically affect the passengers in the car. There will be no inconvenience affecting the passengers in the car. Next, as shown in FIG. 5, after the operation of the slow brake 4, the holding brake 8 operates to brake the rotating body 3 to further decelerate the car. However, at this time, since the car moves up and down at a low speed or is in a stopped state, the operation of the holding brake 8 does not cause a sudden deceleration of the car.

Then, the stopped car is held at the stopped position by the total torque of the two. For this reason, a required holding safety factor can be easily ensured for holding the car at the stop position. The deceleration acting on the car at the time of emergency stop of the car depends on the braking torque of the slow brake 4. However, in the configuration of the embodiment shown in FIGS. 1 to 5, the operating characteristics of the creeping brake 4 can be set independently of the condition of the stop position holding torque. For this reason,
The braking torque value of the slow brake 4 can be set to a value that allows for the occurrence of a difference due to humidity or the like.

The holding brake 8 compensates for the insufficient holding torque of the slow brake 4 for the car stop regardless of the deceleration acting on the car at the time of an emergency stop, and also requires the car to stop alone. It can be designed so as to obtain a holding torque. For this reason, a high degree of freedom in design is obtained, and the device can be easily manufactured.

Further, when one brake is used for both slow braking operation and holding braking operation, the brake is designed according to severe braking specifications such as a friction coefficient, abrasion of a friction material, and heat generated by a braking operation. Be larger. However, since both the slow brake 4 and the holding brake 8 are provided, the braking load is dispersed, and each of the above two can be downsized so that the layout can be easily made.
Therefore, the hoist can be easily reduced in weight and size.

Embodiment 2 FIG. 6 is a view showing an example of another embodiment of the present invention, and is a main part electric circuit diagram conceptually showing connection of electric devices of an elevator hoist apparatus. Except for FIG. 6, an elevator hoist apparatus is configured in the same manner as in FIGS. 1 to 5 described above. In the drawings, the same reference numerals as those in FIGS. 1 to 5 denote corresponding parts, and reference numeral 9 denotes an elevator control device,
It is connected to the.

In the elevator hoisting apparatus constructed as described above, both the slow brake 4 and the holding brake 8 operate by using the mass of the armature 5 and the value of the spring constant of the coil spring 6 together. It is manufactured with the same mechanical time constant. When the car is in an emergency stop or the like, the controller 9
, The slow brake 4 operates first, and the rotating body 3
In addition, after the slow brake 4 operates via the time limit operation device 10, the holding brake 8 operates to brake the rotating body 3. Therefore, although detailed description is omitted, the same operation as the embodiment of FIGS. 1 to 5 can be obtained in the embodiment of FIG.

[0017]

As described above, the present invention drives a sheave to which a main rope for suspending a car of an elevator is engaged, and raises and lowers the car via the sheave. A slow brake that operates at times to brake the rotation of the rotating body associated with the sheave and decelerates the ascent and descent of the car with a deceleration that has no physical effect on the passengers in the car; and operates after the slow brake is operated. And a holding brake that holds the stopped car by braking the rotation of the rotating body.

As a result, at the time of emergency stop of the car or the like, first, the slow-speed brake operates to brake the rotating body and the car is decelerated. At this time, since the braking torque of the slow brake is set to a deceleration that does not physically affect the passengers in the car, there is no problem that the passengers in the car affect the body. In addition, the operating characteristics of the creeping brake can be set independently of the condition of the stop position holding torque, and the braking torque value of the creeping brake can be set to a value that allows for the occurrence of a difference due to humidity or the like. This has the effect of improving the performance. Further, after the slow brake is operated, the holding brake is operated to brake the rotating body, and further decelerate the stopped car. Therefore, no sudden deceleration of the car occurs due to the operation of the holding brake. In addition, the stopped car is held at the stop position by the total torque of the slow brake and the holding brake. For this reason, a required holding force for holding the car at the stop position can be easily secured, and the braking function of the hoist having the braking capacity for holding when the car is stopped and the emergency braking capacity for when the car is emergency stopped. Is realized by a simple configuration.

Further, as described above, according to the present invention, the masses of the armatures and the spring constants of the coil springs provided in each of the slow-motion brake and the holding brake are manufactured to have different values from each other. Due to the difference in the constants, the holding brake is operated after the slow braking is operated.

As a result, due to the difference in the mechanical time constant during the operation of the car at the time of emergency stop or the like, first, the slow brake is operated to brake the rotating body and the car is decelerated. At this time, since the braking torque of the slow brake is set to a deceleration that does not physically affect the passengers in the car, there is no problem that the passengers in the car affect the body. In addition, the operating characteristics of the creeping brake can be set independently of the condition of the stop position holding torque, and the braking torque value of the creeping brake can be set to a value that allows for the occurrence of a difference due to humidity or the like. This has the effect of improving the performance. Further, after the slow brake is operated, the holding brake is operated to brake the rotating body, and further decelerate the stopped car. Therefore, no sudden deceleration of the car occurs due to the operation of the holding brake. In addition, the stopped car is held at the stop position by the total torque of the slow brake and the holding brake. For this reason,
The required holding force for holding the car at the stop position can be easily secured, and the braking function of the hoist having the braking capacity for holding the car when stopped and the emergency braking capacity for the emergency stop of the car is simplified. There is an effect realized by the configuration.

Further, as described above, the present invention is provided with a control device which is connected to the holding brake via the timed operation device and operates the holding brake after the slow braking is operated.

Thus, when the car is in an emergency stop or the like, the control device operates so that the slow brake is operated to brake the rotating body and decelerate the car. At this time, since the braking torque of the slow brake is set to a deceleration that does not physically affect the passengers in the car, there is no problem that the passengers in the car affect the body. In addition, the operating characteristics of the creeping brake can be set independently of the condition of the stop position holding torque, and the braking torque value of the creeping brake can be set to a value that allows for the occurrence of a difference due to humidity or the like. This has the effect of improving the performance. Further, after the slow brake is operated, the holding brake is operated to brake the rotating body, and further decelerate the stopped car. Therefore, no sudden deceleration of the car occurs due to the operation of the holding brake. In addition, the stopped car is held at the stop position by the total torque of the slow brake and the holding brake. For this reason, the required holding force for holding the car at the stop position can be easily secured, and the braking function of the hoist having the holding braking ability at the time of stopping the car and the emergency braking capacity at the time of the emergency stop of the car. Is realized by a simple configuration.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, and is a side view of a hoist.

FIG. 2 is an enlarged perspective view showing a right end side of the hoist of FIG. 1;

FIG. 3 is a right side view of a main part of FIG. 1;

FIG. 4 is an enlarged longitudinal sectional view of a main part of FIG. 3;

FIG. 5 is a graph showing an operation state of a brake of the hoist of FIG. 1;

FIG. 6 is a view showing the second embodiment of the present invention, and is an essential part electric circuit diagram conceptually showing connection of electric equipment of the elevator hoist apparatus.

[Explanation of symbols]

1 hoist, 2 sheaves, 3 rotating bodies, 4 slow brakes,
5 armature, 6 coil spring, 8 holding brake, 9
Control device, 10 Time limit operation device.

Claims (3)

[Claims] 1. A hoist that drives a sheave engaged with a main rope that suspends a car of an elevator, and raises and lowers the car through the sheave. A slow brake that brakes the rotation of the linked rotating body and decelerates the elevation of the car by a deceleration that has no physical effect on the passengers in the car; and A hoisting device for an elevator, comprising: a holding brake that brakes rotation and holds the stopped car. 2. The slow braking device and the holding brake device are manufactured so that the masses of the armatures and the spring constants of the coil springs provided in the two devices are different from each other. 2. The elevator hoist apparatus according to claim 1, wherein the holding brake is operated after the slow brake is operated. 3. The elevator hoist according to claim 1, further comprising a control device connected to the holding brake via a time limit operation device to operate the holding brake after the slow braking is operated. Machine equipment.