WO2000055085A1

WO2000055085A1 - Safety device of elevator

Info

Publication number: WO2000055085A1
Application number: PCT/JP1999/001325
Authority: WO
Inventors: Yasushi Chadani; Masami Yoshikawa; Ad Van Eekelen; Breunis Van De Pol
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 1999-03-17
Filing date: 1999-03-17
Publication date: 2000-09-21
Also published as: EP1086921A1; DE69929515T2; EP1086921A4; EP1086921B1; DE69929515D1

Abstract

A safety device of an elevator having a machine room (2), comprising a car side governor (8) for detecting the over-speed of a car (6) and a weight side governor (21) for detecting the over-speed of a balance weight (7), a weight side governor rope (22) being wound on the weight side governor (21), and both end parts of the weight side governor rope (22) being connected to the balance weight (7), whereby the weight side governor rope (22) is circulated according to rising and lowering of the balance weight (7) and, when the lowering speed of the balance weight (7) exceeds a set value, the weight side governor rope (22) is braked by the weight side governor (21) so as to decelerate the balance weight (7).

Description

Description Elevator Safety Device Technical Field

The present invention relates to a safety device for a rope-type elevator, and more particularly to a safety device for an elevator that suppresses a rising speed of a car when the car rises at an excessive speed. Background art

FIG. 5 is a block diagram showing a conventional elevator as shown in, for example, JP-A-6-15661 and JP-A-6-179585. In the figure, a machine room 2 is provided above a hoistway 1. In the machine room 2, a hoist 3 as a driving device is installed. The hoisting machine 3 is provided with a brake 4 for stopping the rotation of the sheave 3a.

The main rope 5 is wound around the sheave 3a of the hoisting machine 3. A car 6 is suspended from one end of the main rope 5, and a counterweight 7 is suspended from the other end of the main rope 5. The car 6 and the counterweight 7 are alternately moved up and down in the hoistway 1 by the driving force of the hoisting machine 3.

The machine room 2 is provided with a governor 8 for detecting an overspeed of the car 6. A governor rope 9 is wound around the governor 8. Both ends of the governor rope 9 are connected to an emergency stop device 11 provided at the lower part of the car 6, whereby the governor rope 9 is circulated as the car 6 moves up and down. At the lower end of the annular governor rope 9, a tension sheave 10 for applying tension to the governor rope 9 is provided.

At the bottom of the hoistway 1, the car-side shock absorber 12 and the counterweight 7 that receive the car 6 when the car 6 descends to the lowest movement position below the movement range during normal operation Each of the weight-side shock absorbers 13 which receives the counterweight 7 when descending to the moving position is provided.

Next, the operation is explained. The cage 6 and the counterweight 7 are used to drive the hoisting machine 3. It is moved up and down in hoistway 1. If the speed of the car 6 exceeds the rated speed for some reason during the lowering operation of the car 6, the increase in the circulation speed of the governor rope 9 is detected by the governor 8, and the brake 4 operates.

Thereafter, when the descending speed of the car 6 further increases, the governor brake (not shown) provided in the governor 8 operates to apply a mechanical braking force to the governor rope 9. As a result, the safety gear 11 operates. If the car 6 collides with the car side shock absorber 12 before the car 6 is stopped by the emergency stop device 11, the impact is reduced by the car side shock absorber 12.

On the other hand, during the ascent operation of the car 6, if the speed of the car 6 exceeds the rated speed, is detected by the overspeed governor 8 of the car 6, _c also car 6 is stopped decelerated by a brake 4, the car If the counterweight 7 collides with the ffi side buffer 13 before the 6 is stopped, the impact is mitigated by the far side buffer 13.

Thus, in the conventional elevator system, the means for decelerating or stopping the overspeed when the car 6 rises is smaller than the means for decelerating or stopping the overspeed when the car 6 descends. Therefore, improvements for further improving safety are required. Disclosure of the invention

The present invention has been made in order to solve the above-described problems, and has an object to provide an all-around safety device capable of improving safety against overspeed when a car is raised. And

The safety device of the elevator according to the present invention comprises: a hoistway, a car and a counterweight that moves up and down the hoistway, a rope that suspends the car and the counterweight in the hoistway, and a rope. A driving device that raises and lowers the car and the counterweight via a hoistway, and a weight-side shock absorber that is installed in the hoistway and receives the counterweight when the counterweight moves down to the lowest moving position A weight-side governor rope circulated as the counterweight is raised and lowered, and a weight-side governor rope when the lowering speed of the counterweight reaches a set overspeed. It is equipped with a weight that applies braking force and a governor. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a configuration diagram showing an entire elevator according to an example of an embodiment of the present invention, FIG. 2 is a front view showing a weight side governor of FIG. 1,

FIG. 3 is an explanatory diagram for explaining the braking force required of the weight governor of FIG. 1, and FIG. 4 is a flow chart showing an operation when a stop switch is provided on the weight governor.

FIG. 5 is a configuration diagram showing one example of a conventional elevator. BEST MODE FOR CARRYING OUT THE INVENTION

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

FIG. 1 is a configuration diagram showing an entire elevator according to an example of an embodiment of the present invention. In the figure, a machine room 2 is provided above a hoistway 1. In the machine room 2, a hoist 3 as a driving device is installed. The hoisting machine 3 is provided with a brake 4 for stopping the rotation of the sheave 3a.

The machine room 2 is provided with a car-side governor 8 for detecting an overspeed of the car 6. A car-side governor rope 9 is wound around the car-side governor 8. Both ends of the car-side governor rope 9 are connected to an emergency stop device 11 provided at the lower part of the car 6 so that the car-side governor rope 9 is circulated as the car 6 moves up and down. You. At the lower end of the annular car-side governor rope 9, a tensioning wheel 10 for applying tension to the car-side governor rope 9 is provided.

The machine room 2 has substantially the same structure as that of the car speed governor 8 and is provided with an ffi-side governor 21 for detecting an overspeed of the counterweight 7. On the weight governor 2 1 Weight side governor rope 2 2 is wrapped around. Both ends of the weight governor rope 22 are connected to the upper and lower ends of the counterweight 7 via brackets 23a and 23b, respectively. 2 is circulated as the counterweight 7 is raised and lowered. At the lower end portion of the annular weight governor rope 22, a tension sheave 24 for applying tension to the weight governor rope 22 is provided.

Next, FIG. 2 is a front view showing the weight side governor 21 of FIG. In the figure, a base 31 is fixed above the hoistway 1. A base 33 rotatable about an axis 32 is supported on the base 31. The sheave 33 is provided with a pair of flyweights 36, 37 which can rotate around shafts 34, 35, respectively.

The flyweights 36 and 37 are connected to each other via a link 38. An equilibrium spring 39 is provided between one flyweight 37 and the sheave 33. The flyweights 36 and 37 are rotated about the shafts 34 and 35 against the balance spring 39 by the centrifugal force generated by the rotation of the sheave 33.

The base 31 supports a ratchet 41 that can rotate about the shaft 32 independently of the sheave 33. In addition, a braking arm 43 rotatable around a shaft 42 is supported on the base 31. The braking arm 43 is provided with a braking piece 44 facing the weight governor rope 22 wound around the sheave 33.

One end of an operating rod 45 is rotatably connected to the ratchet 41. A spring shaft 46 penetrating the braking arm 43 is fixed to the other end of the operating rod 45. A spring receiver 47 is passed through the end of the spring shaft 46 opposite to the operation rod 45, and a plurality of nuts 48 are screwed thereto. A compression coil spring 49 is provided between the spring support 47 and the braking arm 43. One fly weight 37 is provided with a latch 37 a that engages with the teeth of the ratchet 41.

The detection mechanism in this example has axes 34 and 35, flyweights 36 and 37, links 38, balancing springs 39, and a ratchet 41. The governor brake has a shaft 42, a braking arm 43, a braking piece 44, an operating rod 45, a spring shaft 46, a spring bearing 47, a nut 48 and a compression coil spring 49. ing.

The cage-side governor 8 and the weight-side governor 21 have almost the same structure. However, the cage-side governor 8 further includes a stop switch 51 and an operation member 52 in addition to the weight-side governor 21 as shown by a two-dot chain line in FIG. The stop switch 51 is mounted on the base 31 and outputs a signal for operating the brake 4. The operation member 52 is attached to the flyweight 37, and the stop switch 51 is operated by the rotation of the flyweight 37.

Next, the operation will be described. The car 6 and the counterweight 7 are moved up and down in the hoistway 1 by the driving force of the hoisting machine 3. If the speed of car 6 exceeds the rated speed for any reason during the lowering operation of car 6, an increase in the circulation speed of car side governor rope 9 is detected by car side governor 8, and brake 4 works.

Thereafter, when the descending speed of the car 6 further increases, a mechanical braking force is applied to the car-side governor rope 9 by the car-side governor 8, whereby the safety gear device 11 operates. If the car 6 collides with the car shock absorber 12 before the car 6 is stopped by the emergency stop device 11, the impact is reduced by the car shock absorber 12. On the other hand, if the speed of the car 6 exceeds the rated speed during the ascent operation of the car 6 and reaches the first overspeed set in advance, the overspeed of the car 6 Detected by switch 51, brake 4 operates. If the counterweight 7 collides with the weight buffer 13 before the car 6 is stopped, the impact is reduced by the weight buffer 13.

Also, when the weight-side shock absorber 13 is fully compressed, the car 6 is flipped up at the top in the hoistway 1. Therefore, a space called a top clearance is secured at the top of the hoistway 1 so that the car 6 does not collide with the ceiling of the hoistway 1 by jumping up.

The dimension (height) of the top clearance is determined according to the set speed of the weight side shock absorber 13. That is, if the speed at which the counterweight 7 collides with the weight-side shock absorber 13 is equal to or lower than the set speed, the amount of the car 6 to jump up is also within the range of the top clearance, and the car 6 is Does not hit the ceiling. The set speed of the weight side shock absorber 13 is designed in accordance with the rated speed of the elevator every night.

However, in the unlikely event that the brake 4 is broken or the gear (not shown) of the hoist 3 is broken, before the counterweight 7 collides with the roadside buffer 13, Ascending speed When the overspeed is exceeded and the second overspeed set in advance is reached, the braking force is applied to the weight governor rope 22 by the weight governor 21. The second overspeed is set to be equal to or less than the set speed of the weight side shock absorber 13.

Specifically, when the ascending speed of the car 6, that is, the descending speed of the counterweight 7 reaches the second overspeed, the latch portion 37a engages with the teeth of the ratchet 41, and the ratchet 41 changes its position. —Tube 3 Rotated in the same direction as 3. As a result, the actuation rod 45 is displaced, and the braking arm 43 is moved in the direction of the sheave 33, and the weight side governor rope 22 is pressed by the sheave 33 by the braking piece 44, and the weight side is moved. Governor rope 22 is braked by frictional force.

In this way, the braking of the weight governor rope 22 causes the balancing weight 7 to stop, or the descending speed of the balancing weight 7 is reduced to a speed lower than the set speed of the weight buffer 13. Is done. Therefore, even if the brake 4 is broken or the gear of the hoisting machine 3 is broken, the car 6 is prevented from colliding with the ceiling of the hoistway 1, and safety against overspeed when the car 6 is raised is prevented. The performance is improved.

Here, FIG. 3 is an explanatory diagram for explaining the braking force required for the weight side governor 21 of FIG. In the figure, W 1 is the weight of the car 6, W 2 is the weight of the counterweight 7, F 1 is the braking force by the weight governor 21, and α is the downward acceleration of the counterweight 7.

When the car 6 is rising at an excessive speed, it is considered that the main rope 5 is connected between the car 6 and the counterweight 7. Further, the SI-side governor 21 does not necessarily need to stop the weight-side governor rope 22, and may reduce the speed to the set speed of the weight-side shock absorber 13 or less.

For this reason, the braking force required for the weight side governor 21, that is, the minimum braking force required to decelerate the car 6 and the counterweight 7, depends on the weight of the counterweight 7 and the unloaded state. Only the difference from the weight of car 6 (when F 1 W 2—W 1 is less than 0) _c This braking force is the car 6 that descends at an overspeed when the main rope 5 is cut. It is overwhelmingly smaller than the force required to brake the vehicle. Therefore, by using a structure substantially similar to the structure of the car-side governor 8, safety against overspeed when the car is raised can be improved.

Also, even if the car 6 is raised at an overspeed by the hoisting machine 3, the traction does not occur when the balancing weight 7 collides with the weight buffer 13 and the weight buffer is not generated. Since the cage 6 is lifted after the container 13 is fully compressed, the lift amount of the cage 6 is within the range of the top clearance.

In the above example, the structure of the weight-side governor 21 showing the weight-side governor 21 without the stop switch 51 and the operating member 52 is replaced by the structure of the car-side governor. It may be the same as 8. In this case, the set speed of the stop switch 51 of the weight side governor 21 is slightly higher than that of the car side governor 8 or the output of the stop switch 51 of the weight side governor 21 is invalidated. You can do it.

FIG. 4 is a flowchart showing the operation when the stop switch 51 is provided in the weight governor 21. During the ascending operation of the car 6, the presence or absence of the output of the first overspeed detection signal from the stop switch 51 of the car side governor 8 is always detected (step SI). When the output of the c signal is detected, The brake 4 of the hoisting machine 3 is operated (step S2). Thereafter, the presence or absence of the output of the overspeed detection signal from the stop switch 51 of the weight side governor 21 is detected (step S3).

That is, if the descent speed of the counterweight 7 exceeds the set value (speed slightly higher than the first overspeed) for some reason, a signal for operating the brake 4 of the hoisting machine 3 is output again (step S 4). After this, the descending speed of the counterweight 7 becomes the second overspeed

The following is mechanically detected by the weight governor 21 (step S5). Then, when the descending speed of the counterweight 7 exceeds the second overspeed, the 31-side governor rope 22 is braked by the weight-side governor 21 as described above.

In this way, by providing the stop switch 51 on the weight side governor 21, even if the stop switch 51 of the car side governor 8 fails, the brake 4 can be operated with the first set value. It can be operated and safety can be further improved.

Claims

The scope of the claims

1. A hoistway, a car and a counterweight that moves up and down the hoistway, a rope that suspends the car and the counterweight in the hoistway, and the car and the An elevator comprising a drive device for raising and lowering the counterweight, and a weight-side shock absorber installed in the hoistway and receiving the counterweight when the counterweight is lowered to the lowest moving position. A safety device used in the evening,

The weight-side governor rope circulated as the counterweight rises and descends, and the lightning-side governor rope is mechanically moved when the descending speed of the counterweight reaches a set overspeed. A safety device that is equipped with a weight governor that applies braking force.

2. The weight governor on the weight side

A base provided above the hoistway,

A shaft rotatably provided on the base and having the weight-side governor port wound thereon;

A detecting mechanism for detecting the overspeed of the counterweight by rotation of the sheave; and a governor for braking the weight side governor rope when the detecting mechanism detects an overspeed of the counterweight. Brake and

The elevator safety device according to claim 1, comprising:

3. The safety device according to claim 1, wherein the braking force by the weight side governor is set to be equal to or greater than the difference between the weight of the counterweight and the weight of the car in a no-load state. _c