JP2646049B2 - Elevator governor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator governor installed on a car and is suitable for a governor of a low-press linear motor elevator to which a governor rope is not attached.

[0002]

2. Description of the Related Art FIG. 3 is a front view showing a main part of a conventional elevator governor. In FIG. 3, 1 is a governor body,
Reference numeral 2 denotes a sheave rotatably connected to and supported by a shaft 3 fixed to the main body 1, reference numeral 4 denotes a governor rope wound around the sheave 2, and one end of the governor rope 4 is connected to an elevator car (not shown). Is held. Reference numeral 5 denotes a pair of fly weights which are pivotally mounted on opposite sides of the shaft 3 on the side of the sheave 2 and are displaced in the radial direction of the sheave 2, and 6 is a connecting rod for connecting the fly weights 5 to each other. The connecting rod 6 is pivotally mounted so that both fly weights 5 move in the same direction.
Reference numeral 7 denotes a spring whose one end and the other end are supported by the flyweight 5 and the sheave 2 to face centrifugal force, 8 denotes an actuator provided on the center of gravity of the flyweight 5, and 9 denotes an operator. A claw 10 provided on the opposite side of the operator 8 of the fly weight 5 provided with 8;
Is a ratchet wheel pivotally supported on the shaft 3, and the ratchet wheel 11 is provided with a flaw in which the pawl 9 is engaged only when rotating the sheave 2 in one direction. Further, the ratchet wheel 11 is connected to a mechanical safety device (both not shown) via a braking mechanism.

Next, the operation of the conventional elevator governor configured as described above will be described. The sheave 2 rotates as the governor rope 4 moves in synchronization with the elevation of the car. Therefore, while the flyweight 5 revolves with the sheave 2, the flyweight 5 is displaced by centrifugal force corresponding to the rotation speed of the sheave 2, that is, the speed of the car. Then, the first overspeed in which the elevator speed of the car exceeds a predetermined value (usually, the first overspeed of rated speed 1.
When the flyweight 5 is displaced by the centrifugal force, the actuator 8 comes into contact with the operating arm 10a of the car stop switch 10 to rotate the operating arm 10a, thereby operating the stop switch 10. The power supply of the elevator driving device (not shown) is cut off and the car is stopped. Also, for example, when the main mechanism of the elevator is broken, the car continues to descend without stopping even if the drive device stops,
When the overspeed (normally about 1.4 times the rated speed) is reached, the flyweight 5 is displaced by the centrifugal force generated by the rotation of the sheave 2 corresponding to this speed, and the pawl 9 engages with the ratchet wheel 11. For this reason, the governor rope 4 is braked by the braking mechanism connected to the ratchet wheel 11, and the emergency stop device provided on the car operates to stop the car abruptly.

The above is an example in which the elevator governor body is located above the hoistway. The elevator governor body is mounted on a car, and the sheave is pressed against the guide rail without using a governor rope and rotated by friction. In some cases, overspeed was detected.

[0005]

Since the conventional elevator governor is configured as described above, it has the following problems. In a governor in which a governor rope is interposed between the car and the speed detecting mechanism, the governor sometimes malfunctions due to resonance of the governor rope. Even when the speed governor is provided on the car, the speed of the car is detected by the friction between the guide rail and the sheave, so that malfunction may occur if the friction is reduced due to oil adhesion or the like. In addition, even after being converted to the rotational speed of the sheave, the conventional speed detection mechanism based on the displacement of the flyweight has a structure that is affected not only by centrifugal force but also by the inertial force in the rotational direction and the traveling direction of the car. And also caused a malfunction.

The present invention has been made to solve these problems, and an object of the present invention is to provide an elevator governor having a simple structure and high reliability based on a new principle of speed detection.

[0007]

According to a first aspect of the present invention, a conductor is disposed and fixed in the traveling direction of the elevator over the entire hoistway of the elevator, and the conductor and the magnet sandwiching the conductor via a space are accompanied by the traveling of the elevator. A force detection mechanism for detecting the force applied to the magnet is provided on a car, and the braking device is operated using the force detected by the force detection mechanism.

According to a second aspect of the invention, a conductor is disposed and fixed in the traveling direction of the elevator over the entire hoistway of the elevator, and a link is provided which pivots around a point on the platform on the car as a fulcrum. A magnet that moves in parallel with the conductor with the conductor interposed therebetween, and a balance weight that balances with the magnet side is arranged at the other end of this link, and converts the force transmitted to the balance weight as the elevator travels into vertical displacement. An elastic body is provided, and the braking device is operated using this displacement.

[0009]

In the first aspect of the present invention, if the magnet mounted on the car has a speed with respect to the conductor fixed to the hoistway,
The magnet receives a force in the direction opposite to the speed according to the speed, based on the principle of the Arago disk. Therefore, if the car overspeeds, the magnet will receive a force above a certain value,
The elevator can be stopped by using the force or displacement as an operation source of the car stop switch.

In the second invention, since the magnet and the balance weight are balanced at the fulcrum by the link, the inertia force acting on the magnet is canceled by the inertia force of the balance weight, and the malfunction of the governor due to the acceleration of the car. Can be eliminated.

[0011]

1 is a front view of an elevator governor according to an embodiment of the present invention, and FIG. 2 is a plan view of FIG. In the figure, 1
Reference numeral 2 denotes an elevator car, 13 denotes a base of an elevator governor provided on the car 12, and 14 denotes two pairs of parallel links rotatably supported on a fulcrum 15 of the base 13. The reason why the parallel link 14 is used is to move the magnet 16a in parallel with the fixed conductor 18. Reference numeral 16 denotes a pickup for speed detection connected to one end of the parallel link 14 at two points, and reference numeral 17 denotes a balance weight connected to the other end of the parallel link 14 at the same two points and provided to balance with the pickup 16. . The pickup 16 includes magnets 16a disposed on both sides opposite to a fixed conductor 18 which is a secondary conductor of a linear induction motor disposed and fixed on the hoistway.
And a back yoke 16b for securing a path for the magnetic flux of the two magnets 16a. Also, 19
Is a spring for changing the force acting on the balance weight 17 into a displacement, and 20 is a braking device provided with a car stop switch and an emergency stop operation mechanism (both not shown) operated by the displacement of the balance weight 17.

Next, the operation will be described. The magnetic circuit constituted by the magnet 16a and the back yoke 16b
A magnetic field perpendicular to the plane of the fixed conductor 18 existing between the points a and a is generated. When the car 12 moves up and down and this magnetic field moves in the fixed conductor 18, an eddy current is generated in the fixed conductor 18 so as to cancel the change in the magnetic field, and the magnet 16 a has a size corresponding to the speed of the car 12, It receives force in the opposite direction to its speed (the principle of the Arago disk). For example, when the car 12 descends, the magnet 16a receives a force in the direction of arrow A in FIG. This force is applied to the magnet 16a by the parallel link 14 and the spring 19.
And the displacement of the balance weight 17 in the vertical direction.

When the lowering speed of the car 12 reaches a first overspeed exceeding a predetermined value, the magnet 16a receives an upward magnetic force corresponding to this speed, and the magnet 16a
Displaces the balance weight 17 connected via the downward direction. The displacement causes the car stop switch provided in the braking device 20 to operate, thereby turning off the power to the elevator driving device (not shown) and stopping the car. Even if the second overspeed is reached for some reason, the balance weight 17 is further displaced in accordance with this speed,
With the emergency stop operation mechanism provided in the braking device 20,
An emergency stop device (not shown) provided on the car 12 operates to suddenly stop the car.

When the car has acceleration, the pickup 16 receives the inertial force, but at the same time, the balance weight 17 also receives the inertial force in the same direction, so that no moment about the fulcrum 15 is generated. Therefore, the elevator governor according to the present invention is not affected by the acceleration of the car.

In the above embodiment, the secondary conductor of the linear induction motor of the low-press linear motor elevator is used as the fixed conductor. However, a specially provided fixed conductor or a guide rail of a car may be used. .

[0016]

As described above, according to the first aspect of the invention, the speed of the car is directly detected by applying the principle of the Arago disk, so that the speed of the car can be reduced as in the prior art. There is no need to convert the rotation speed using a rope or traction, and a highly reliable elevator governor with a simple configuration can be obtained.

According to the second aspect of the present invention, since the inertia force acting on the speed detecting mechanism is cancelled, a highly reliable elevator control which is not affected by the acceleration of the car and does not malfunction due to the acceleration. You get the speed.

[Brief description of the drawings]

FIG. 1 is a front view showing an elevator governor according to one embodiment of the present invention.

FIG. 2 is a plan view showing an elevator governor according to one embodiment of the present invention.

FIG. 3 is a front view showing a main part of a conventional elevator governor.

[Explanation of symbols]

 Reference Signs List 12 basket 13 base 14 parallel link (rotating body) 15 fulcrum 16 pickup 16a magnet 16b back yoke 17 balance weight (balance tool) 18 fixed conductor (conductor) 19 spring 20 braking device

Claims (6)

(57) [Claims] 1. A conductor along a traveling direction of a car in a hoistway.
Is fixed to the cage, and is provided in the cage and faces the conductor via the space.
The stone and the magnets provided on the car as the car travels
A force detection mechanism that detects the force in the running direction applied to the stone
Based on the force in the traveling direction detected by the force detection mechanism.
Operating the car braking device.
Elevator governor. 2. A conductor along a traveling direction of a car in a hoistway.
Rotator but in those arranged fixed, that is rotatably supported on a fulcrum provided in the car
And opposed to the conductor via a space provided in the rotating body
A possible magnet and the opposite side of the fulcrum away from the magnet
When the car is stopped and provided on the rotating body,
Balance the rotor with the magnet facing the conductor
A balancing tool for maintaining the state,
Restricts the range of rotation of the rotator by interposing between the rotator
And an elastic body, which is attached to the magnet as the car travels.
Based on the amount of displacement of the rotating body that rotates due to the application of force.
Operating the braking device of the car based on the
Elevator governor. 3. A magnet sandwiches said conductor through a space.
Are arranged on both sides of the conductor as described above.
Item 3. An elevator governor according to item 2. 4. A link mechanism in which a rotating body is supported on a fulcrum.
The method according to any one of claims 2 to 3, wherein
Elevator governor. 5. A linear motor elevator comprising a linear motor elevator.
A Guide to the secondary conductor of the induction motor or the car
5. The guide rail according to claim 2, wherein
The elevator governor according to any one of the above. 6. The vertical direction between the magnet side and the balancer side of the rotating body.
That the moment of inertia is balanced around the fulcrum
The elevator according to any one of claims 2 to 5, wherein
-Governor.