Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
  • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
  • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
  • B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
  • B66B5/044—Mechanical overspeed governors

Definitions

• 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.
• FIG. 5 is a block diagram showing a conventional elevator as shown in, for example, JP-A-6-15661 and JP-A-6-179585.
• a machine room 2 is provided above a hoistway 1.
• 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.
• a tension sheave 10 for applying tension to the governor rope 9 is provided.
• 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.
• 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.
• the governor brake (not shown) provided in the governor 8 operates to apply a mechanical braking force to the governor rope 9.
• 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.
• 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.
• the safety device of the elevator 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
• FIG. 3 is an explanatory diagram for explaining the braking force required of the weight governor of FIG. 1
• 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
• FIG. 1 is a configuration diagram showing an entire elevator according to an example of an embodiment of the present invention.
• a machine room 2 is provided above a hoistway 1.
• a hoist 3 as a driving device is installed in the machine room 2.
• 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 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.
• a tensioning wheel 10 for applying tension to the car-side governor rope 9 is provided.
• 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.
• 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.
• a tension sheave 24 for applying tension to the weight governor rope 22 is provided.
• FIG. 2 is a front view showing the weight side governor 21 of FIG.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• FIG. 3 is an explanatory diagram for explaining the braking force required for the weight side governor 21 of FIG.
• 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
• ⁇ is the downward acceleration of the counterweight 7.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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).
• the brake 4 of the hoisting machine 3 is operated (step S2).
• 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).
• step S5 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.
• the brake 4 can be operated with the first set value. It can be operated and safety can be further improved.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Maintenance And Inspection Apparatuses For Elevators (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (1)

Family

ID=14235212

Family Applications (1)

Country Status (3)

Cited By (6)

Families Citing this family (3)

Citations (2)

Family Cites Families (1)

• 1999
  • 1999-03-17 DE DE69929515T patent/DE69929515T2/de not_active Expired - Fee Related
  • 1999-03-17 WO PCT/JP1999/001325 patent/WO2000055085A1/ja active IP Right Grant
  • 1999-03-17 EP EP99909205A patent/EP1086921B1/de not_active Expired - Lifetime

Patent Citations (2)

Non-Patent Citations (1)

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