JP2010024014A - Hoisting machine for elevator - Google Patents

Abstract

An elevator hoisting machine having an emergency brake capable of obtaining a sufficient braking force in the event of an abnormality such as upward overspeed of a passenger car traveling in an elevator or running in a door open state is provided.
A driving sheave 3 on which a main rope 6 for suspending a car 7 on one side and a counterweight 8 on the other side is wound, an electric motor 2 for driving the driving sheave 3, and the electric motor 2 are braked. In an elevator hoisting machine that includes a normal brake 4 and drives the elevator car 7 and the counterweight 8 to move up and down, the elevator hoisting machine operates in the event of an abnormality during the traveling of the elevator, and the main rope 6 and the drive sheave 3 on the drive sheave. Configuration with an emergency brake that brakes both simultaneously.
[Selection] Figure 1

Description

The present invention relates to an elevator hoisting machine provided with an emergency brake that operates when an abnormality occurs while the elevator is running.

  A conventional rope type elevator is configured in a suspending shape with a car and a counterweight suspended on both sides of a main rope wound around a driving sheave of a hoisting machine. The hoisting machine is composed of the driving sheave, an electric motor that drives the driving sheave, and a brake device that is normally operated to stop and hold the car and the counterweight. The brake adding means for applying a braking force to the rotating part of the machine and the brake releasing means for releasing the braking of the brake adding means. As the form of the hoisting machine, there is a speed reducer or no speed reducer, and in the case with a speed reducer, a motor and a brake device are generally provided on the input shaft on the high speed side and driven on the output shaft on the low speed side. A sheave is provided. When the reduction gear is not attached, the brake device and the drive sheave are provided on the output shaft of the electric motor.

  In the elevator configured as described above, the electric motor and the brake device of the hoisting machine are controlled by the control device, and the electric motor and the drive sheave are driven and braked. As a result, the wound main rope is driven and braked, and the car and the counterweight are lifted and stopped in the hoistway.

As the brake device, one using a driving belt pressing brake and a main rope holding brake (see, for example, Patent Document 1), and one using a main rope pressing brake and a driving sheave pressing brake on the driving sheave (for example, a patent) Reference 2),
Further, a motor shaft brake, a main rope pressing brake on the drive sheave and a main rope holding brake (see, for example, Patent Document 3 and Patent Document 4), a motor shaft brake, a deflector wheel brake, a main rope holding brake, and Using a main rope pressing brake on a deflector (see, for example, Patent Document 5), a motor shaft brake, a main rope pressing brake on a deflector, a main rope pressing brake on a driving sheave, a car, and a counterweight There is one using a main rope holding brake on a suspension vehicle (see Patent Document 6, for example).
JP 2003-252552 A JP 2005-132508 A JP 2006-103928 A JP 2006-105339 A Japanese Patent No. 2064844 Japanese Patent No. 2762244

  Since elevators are vertical traffic machines used by people, safety must be taken into consideration. The emergency stop device provided in the car is an emergency stop means for the elevator, which can be operated and braked and stopped effectively against the downward overspeed of the car, but is invalid for the overspeed in the upward direction. . Therefore, recently, the elevator car, the counterweight, and the main rope are braked both in the vertical direction when the elevator is running abnormally, such as when the elevator is overspeeded and the elevator door is open. And emergency brakes to stop are now required. However, the one disclosed in the above patent document has a problem in that it plays a role as an emergency brake due to insufficient braking force.

  The object of the present invention is to solve the above-mentioned problems, and it is possible to obtain a sufficient braking force at the time of an abnormality such as an upward overspeed of the elevator car traveling in an elevator or a door open state traveling. The object is to provide an elevator hoist with an emergency brake that can be used.

  In order to achieve the above object, in claim 1 of the present invention, a driving sheave around which a main rope that suspends a car on one side and a counterweight on the other side is wound, an electric motor that drives the driving sheave, In an elevator hoisting machine that includes a normal brake that brakes the electric motor and that drives the elevator car and the counterweight to move up and down, the elevator hoisting machine operates when the elevator travels abnormally, and the main rope and the drive sheave on the drive sheave Both are equipped with emergency brakes that brake simultaneously.

  With this configuration, when the elevator is abnormal, the drive sheave and the main rope are simultaneously braked and stopped, so that a sufficient braking force can be obtained.

  According to a second aspect of the present invention, the emergency brake according to the first aspect of the present invention is configured such that the emergency brake clamps the braked body and applies a braking force, and a spring force as a clamping pressure is applied to the pair of clamping devices. And a driving means for releasing the clamping pressure of the clamping means against the spring force of the clamping spring and releasing the braking. The driving means includes an electromagnet and the electromagnet. The iron piece is connected to one of the clamping means, and the iron piece is connected to the other of the clamping means, and the iron piece is electromagnetically attracted by the electromagnet. Then, the braking of the braked body is released, and the electromagnetic attraction of the iron piece is released by de-energizing the electromagnet to apply braking to the braked body.

  With this configuration, it can be easily retrofitted to a hoisting machine with a speed reducer and a sufficient braking force can be obtained.

  According to a third aspect of the present invention, the emergency brake according to the first aspect of the present invention is configured such that the emergency brake clamps the braked body and applies a brake, and a spring force as a clamping pressure is applied to the pair of clamping means. And a driving means for releasing the clamping pressure of the clamping means against the spring force of the clamping spring and releasing the braking, and the driving means includes a cylinder and a piston. The jack means comprises one of the cylinder and the clamping means, and the piston is connected to the other of the clamping means, and hydraulic or pneumatic pressure is injected between the cylinder and the piston to The braked body is released, the hydraulic pressure or the air pressure is discharged, and the braked body is applied with the brake.

  With this configuration, an elevator hoisting machine can be obtained as in the second aspect, and the driving means can be reduced in size.

  According to the present invention, the driving sheave and the main rope are simultaneously braked and stopped at the time of abnormality such as upward overspeed of the elevator car or running in the door open state, so that a sufficient braking force can be obtained.

  Embodiments of an elevator hoist according to the present invention will be described below with reference to the drawings.

  1 is an overall configuration diagram of an elevator equipped with an elevator hoist according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of an emergency brake portion showing a braking applied state, and FIG. 3 is a braking released state of FIG. 4 is a cross-sectional view of the emergency brake portion, FIG. 4 is a view corresponding to FIG. 2 showing a case where oil or air pressure jack means is used as drive means, and FIG. 5 is an elevator hoisting machine according to a second embodiment of the present invention. It is a whole block diagram of the provided elevator.

  In FIG. 1, 1 is a speed reducer, 2 is an electric motor, which is connected to the input shaft 1a on the high speed side of the speed reducer 1 and is controlled by a control device 2a. A drive sheave 3 is connected to the output shaft 1b on the low speed side of the speed reducer 1. Reference numeral 4 denotes a normal brake that operates during normal operation of the elevator and is provided to brake the rotating shaft 5 of the electric motor 2. A main rope 6 is wound around the drive sheave 3 and is connected to and suspended from a car 7 and a counterweight 8 on both sides. Reference numeral 9 denotes an emergency brake, which is operated when an abnormality occurs, for example, when the car is overspeeded and the elevator door is open, and the drive sheave 3 and the main rope 6 on the drive sheave 3 are simultaneously pressed to brake. , Stop. The hoisting machine 10 includes the speed reducer 1, the electric motor 2, the drive sheave 3, the normal brake 4 and the emergency brake 9, and is installed on the base 11.

  The emergency brake 9 includes a pinching spring 12, a pair of pinching means 13a and 13b, and a driving means 14. The spring force of the pinching spring 12 is added to the pinching means 13a and 13b, and The clamping means 13a and 13b are driven by the driving means 14 against the spring force of the clamping spring 12, and a clamping pressure is applied to the driving sheave 3 and the main rope 6 on the driving sheave 3. The brake is applied and braking is applied and released.

  The one side clamping means 13 a abuts on the drive sheave 3, and the other side clamping means 13 b abuts on the main rope 6 on the drive sheave 3.

  Reference numeral 15 denotes an electromagnetic device as the driving means 14, which includes an electromagnet 16 comprising an electromagnetic coil 16a and a yoke 16b, and an iron piece 17 that is electromagnetically attracted to the electromagnet 16, and the electromagnet 16 and the one side clamping means 13a. Are connected by the connecting member 18, and the iron piece 17 and the pressing means 13b on the other side are coupled. The iron piece 17 is supported by a shaft 19 and slidably supported by an electromagnet 16. The pinching spring 12 is mounted between the electromagnet 16 and the iron piece 17 so that the spring force spreads both. The electromagnet 16 includes a bracket 16c, and the bracket 16c is slidably supported on a shaft 21 provided on a support member 20 extending from the speed reducer 1.

  That is, the entire emergency brake 9 is slidably supported by the shaft 21 and slides in the vertical direction in this figure, and the spring force of the clamping spring 12 and the transmission from the driving means 14 to the clamping means 13a and 13b are in the vertical direction. By a linear motion mechanism that moves linearly. Reference numerals 22a and 22b denote stopping members, which restrict the downward sliding displacement of the entire emergency brake 9, and the stopping member 22b limits the lateral movement of the clamping means 13a and 13b. .

  FIG. 2 shows the details of the emergency brake 9 and shows the braking applied state of the emergency brake 9 when the electromagnet 16 is de-energized. The same parts as those in FIG. Between the electromagnet 16 and the iron piece 17 is pushed and expanded by the pinching spring 12, the pinching means 13 a on one side is in contact with the lower side of the drive sheave 3, and the pinching means 13 b on the other side is on the upper side of the drive sheave 3. Abutting against the rope 6, the driving sheave 3 and the main rope 6 on the driving sheave 3 are pinched. That is, the emergency brake 9 simultaneously clamps and brakes the drive sheave 3 and the main rope 6 on the drive sheave 3. At this time, the gap between the electromagnet 16 and the iron piece 17 is 2δ, and the emergency brake 9 is spaced from the stopping means 22a by an interval δ that is half the gap 2δ.

  Similarly, FIG. 3 shows the brake release state of the emergency brake 9 when the electromagnet 16 of FIG. 2 is energized, and the same parts as those in FIGS. The electromagnet 16 electromagnetically attracts the iron piece 17 against the spring force of the pinching spring 12, and the gap 2δ becomes zero. At this time, the entire emergency brake 9 is slidably supported by the shaft 21 and is about to move downward by the gap 2δ, but the lower one side clamping means 13a moves by δ and stops at the stopping means 22a. The upper side clamping means 13b moves together with the electromagnet 16 and the iron piece 17 by δ upward. In other words, when the iron piece 17 is electromagnetically attracted and displaced by the gap 2δ, the upper and lower pressing means 13a and 13b are displaced by δ by half, resulting in a gap δ from each contact portion.

  Next, operations of the elevator and the emergency brake 9 configured as described above will be described. During normal operation of the elevator, the braking by the emergency brake 9 is released, the braking of the normal brake 4 is released, the motor 2 is energized and driven, and the drive sheave 3 is driven via the speed reducer 1 The main rope 6, the car 7 and the counterweight 8 are raised and lowered. In order to stop the elevator, the motor 2 is de-energized to stop the rotation, and the brake is applied with the normal brake 4 to stop and hold the speed reducer 1, the drive sheave 3, the main rope 6, the car 7 and the counterweight 8. To do. When the elevator travels abnormally, the motor 2 is de-energized, the normal brake 4 is activated, and the emergency brake 9 is applied to apply braking to the drive sheave 3, the main rope 6 on the drive sheave 3, the car 7 and The counterweight 8 is braked and stopped in the vertical direction.

  Therefore, as described above, the emergency brake 9 can brake and stop the driving sheave 3 and the main rope 6 on the driving sheave 3 in the vertical direction of the car. When an abnormality such as traveling occurs, an elevator hoisting machine 10 having an emergency brake 9 that can brake the drive sheave 3 and the main rope 6 to stop the car and can be easily retrofitted to the hoisting machine with a reduction gear is obtained.

  In the embodiment of the present invention, since both the main rope and the drive sheave are pressed and braked, there is no change in the repeated load applied to the shaft of the drive sheave, and slipping between the main rope and the drive sheave can be prevented.

  Next, another form of the drive means 14 will be described with reference to FIG. FIG. 4 is a diagram corresponding to FIG. This embodiment is different from FIG. 3 in that the electromagnetic device portion is replaced with hydraulic or pneumatic jack means 24. That is, the jack means includes a piston 25 and a cylinder 26, and operates by injecting and discharging hydraulic pressure or air pressure between the piston 25 and the cylinder 26. The piston 25 and the other side clamping means 13 b are connected, and the cylinder 26 is connected to the one side clamping means 13 a via the bracket 16 c and the connecting member 18. Then, the pressure of the pinching springs 12a and 13b is released against the spring force of the pinching spring 12 by injecting pressure from the hydraulic or pneumatic pressure source 27 to release the braking, and the pressure of the pinching spring 12 is released by releasing the pressure. The spring force is restored and the clamping pressure of the clamping means 13a and 13b is applied to apply braking.

  The operation of the elevator and the emergency brake 9 in this form is the same as when the electromagnetic device 15 as the driving means 14 is used. With this configuration, since the high-pressure oil or air is used, the driving means 14 can be downsized.

  Further, a second embodiment will be described with reference to FIG. This embodiment is different from the embodiment shown in FIG. 1 in that an emergency brake is attached to a hoisting machine without a speed reducer, so that the hoisting machine with an emergency brake is integrated with a normal brake. The same parts as those in FIG.

  In FIG. 5, the hoisting machine 47 is installed at the lower part of the hoistway, the main rope 6 wound around the drive sheave 48 extends upward, and the car 7 and the suspension are lifted via a deflecting wheel 49 at the upper part of the hoistway. The weight 8 is suspended. Then, the main rope 6 is driven by the rotation of the drive sheave 48 and is moved up and down.

  50 is an electric motor, 51 is a rotating body of the electric motor 50, and the drive sheave 48 is provided on the rotating body 51. Reference numeral 52 denotes a normal brake that applies or releases braking to the rotating body 51 as a braked body during normal operation. The normal brake 52 includes a braking spring 53 as a braking application unit, a driving unit 54 as a braking release unit, a braking piece 55 that abuts against the rotating body 51 and brakes, and the spring force and driving unit of the braking spring 53. 54 includes at least one set of brake arms 56 that transmit a driving force of 54 and functions independently as a brake. FIG. 5 shows a case where two sets are provided. The emergency brake 57 is the emergency brake 9 of the first embodiment described with reference to FIG. 1 and is provided so as to clamp and brake the drive sheave 48 and the main rope 6 on the drive sheave 48. The electric motor 50, the normal brake 52, and the emergency brake 57 are provided on the base 58 and are integrally formed.

  In this embodiment, the hoisting machine with an emergency brake without a speed reducer is used, and the same effect as the first embodiment can be obtained.

1 is an overall configuration diagram of an elevator including an elevator hoist according to an embodiment of the present invention. It is sectional drawing of the emergency brake part which shows a braking addition state. It is sectional drawing of the emergency brake part which shows the brake release state of FIG. FIG. 3 is a view corresponding to FIG. 2 showing a case where jack means using oil or air pressure is used as the drive means. It is a whole block diagram of the elevator provided with the elevator hoisting machine which becomes 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reducer 2 Electric motor 3 Drive sheave 4 Normal brake 5 Electric motor 6 Rope 7 Car 8 Balance weight 9 Emergency brake 10 Hoisting machine 12 Clamping springs 13a, 13b Clamping means 14 Drive means 16 Electromagnet 17 Iron piece 24 Jack means 25 Piston 26 Cylinder

Claims (3)

A driving sheave around which a main rope for suspending a car on one side and a counterweight on the other side is wound; an electric motor that drives the driving sheave; and a normal brake that brakes the electric motor. In the elevator hoisting machine that lifts and lowers the weight,
An elevator hoisting machine comprising an emergency brake that operates when an abnormality occurs during the traveling of the elevator and brakes both the main rope and the drive sheave on the drive sheave at the same time.   The emergency brake includes a pair of clamping means for clamping the braked body and applying braking, a clamping spring for applying a spring force as a clamping force to the pair of clamping means, and a spring of the clamping spring Driving means for releasing braking by releasing the clamping pressure of the clamping means against force, and the driving means comprises an electromagnet and an iron piece attracted by the electromagnet, One of the clamping means is connected, and the iron piece is connected to the other of the clamping means, the iron piece is electromagnetically attracted by the urging of the electromagnet to release the braked body, 2. The elevator hoisting machine according to claim 1, wherein the electromagnetic attraction of the iron piece is canceled by deenergizing the electromagnet to apply braking to the braked body.   The emergency brake includes a pair of clamping means for clamping the braked body and applying braking, a clamping spring for applying a spring force as a clamping force to the pair of clamping means, and a spring of the clamping spring Driving means for releasing the braking by releasing the clamping pressure of the clamping means against force, and the driving means is jack means including a cylinder and a piston, and the cylinder and the clamping means And the piston is connected to the other of the clamping means, and hydraulic or pneumatic pressure is injected between the cylinder and the piston to release braking of the braked body. 2. The elevator hoisting machine according to claim 1, wherein pressure is discharged to apply braking to the braked body.

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