JPS5941911B2 - governor for elevator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a governor for detecting overspeed of an elevator, and more particularly to a frictional resistance device thereof.

FIG. 1 is a schematic configuration diagram showing the relationship between an elevator and a governor. An endless governor rope 2 is wound around a governor pulley 1, and a governor weight pulley 3 is provided at the lower end of the governor rope 2. The governor rope is given 2 tic tension.

The frame 5 of the cage 4 grasps a part of the governor rope 2 via a connecting rod 6 which is an operating lever of the safety device, and drives the governor pulley 1 to rotate at the speed of the cage 4 during normal operation.

As shown in FIGS. 2 and 3, a conventional centrifugal force type governor includes a governor pulley 1 and a pendulum bone 8 rotatably supported around a shaft 7.
They are elastically coupled to each other in the rotational direction via a pin 9 fixed to the pendulum bone 8 and a vibration isolation spring 11 engaged to a pin 10 fixed to the pendulum bone 8.

Further, in order to control the relative rotation between the governor pulley 1 and the pendulum bone 8, a brake piece 13 is attached to the other end of the leaf spring 12, one end of which is fixed to the pendulum bone 8.
By elastically pressing against a braking surface 14 formed on the outer peripheral side surface of the governor pulley 1, frictional resistance against relative rotation between the governor pulley 1 and the pendulum bone 8 is provided. A pendulum 16 is rotatably supported.

In normal operation, the governor pulley 1 and the pendulum bone 8 are set to rotate integrally without relative rotation due to the sliding frictional resistance, so that the running speed of the cage 40, that is, the rotation speed of the governor pulley 1 is A centrifugal force that is transmitted to the pendulum bone 8 at a ratio of 1:1 and is proportional to the square of this speed acts on the center of gravity of the pendulum 16, causing the pendulum 16 to move outward around the axis 15 while compressing the speed adjustment spring 17. It looks like this.

When the speed exceeds a specified speed, for example, 1.3 times the rated speed, the claw 18 at the tip of the pendulum 16 engages the drive motor's power on/off switch 19 to operate the drive motor. At the same time as the power source is opened and stopped, the brake is operated as the power source for the drive motor is opened, and the cage 4 is stopped.

Further, when the speed exceeds, for example, 1.4 times the rated speed or more, the claw 18 at the tip of the pendulum 16 hits the hook 20 and the catch weight 21 is dropped.

The catch weight 21 presses the governor rope 2 against the holding plate 23 by the elastic force of the spring 22 to grasp the governor rope 2, thereby causing relative movement between the cage 4 and the governor rope 2, and operating the safety device lever. This acts to stop the cage 4.

By the way, when operating at rated speed, cage 4
If the cage 4 is shaken due to passengers inside becoming violent, etc.
A natural vibration (usually about 3 Hz) of the cage 4 is generated, and this vibration is transmitted to the governor pulley 1 via the governor rope 2. If this vibration is large, the friction between the governor pulley 1 and the pendulum bone 8 due to the frictional resistance Since integral movement is no longer possible, the governor pulley 1 and the pendulum bone 8 begin to rotate relative to each other via the vibration isolation spring 11.
The large vibration transmitted to the governor pulley 1 is It is difficult to be transmitted to the pendulum bone 8.

However, the frictional resistance between the braking surface 14 formed on the outer peripheral side of the governor pulley 1 and the braking piece 13 attached to the pendulum bone 8 via the plate spring 12 is caused by rust and dust on the braking surface 14, especially on the braking surface. 14 is located on the outer periphery of the pulley, rope oil etc. scattered from the governor rope 2 etc. adheres to this friction sliding part and the frictional force between the brake piece 13 and the brake surface 14 fluctuates significantly. If the frictional force becomes too small, relative rotation between the pendulum bone 8 and the governor pulley 1 will occur even when the speed of the governor pulley 1 is normally accelerated as shown by curve a in FIG. As a result, the pendulum bone 8 generates excessive vibration and overshoots as shown in the curved line, resulting in excessive speed, the pendulum 16 responds to this, and the switch 19 and safety device operate.

In addition, the frictional force becomes excessive and the governor pulley 1 and pendulum bone 8
When the vibration isolating spring 1 becomes stiff and fixed,
1 completely disappears, and the large natural vibration of the cage 4 transmitted to the governor pulley 1 is transmitted to the pendulum bone 8 at 1:1.
The pendulum 16 responds to this by moving the cage 4.
The drawback was that the safety device was activated even when the average speed of the vehicle did not exceed the speed limit.

Furthermore, a braking surface 14 is provided on the outer periphery of the pulley,
Since a large braking force is generated with a small pressing force, the brake piece 1
It was necessary to reduce the pressing force of the leaf spring 12 that is pressed through the plate spring 3, making it difficult to adjust the frictional resistance.

SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator governor that eliminates the above-mentioned drawbacks of the prior art and provides stable and accurate overspeed detection performance.

In order to achieve this object, the present invention is characterized in that a brake piece is provided on the boss portion of either the governor pulley or the pendulum bone, and the elastic pressing force thereof can be adjusted.

An embodiment of the present invention will be described below with reference to FIGS. 5 to 8.

In FIGS. 5 and 6, the same reference numerals as in FIGS. 2 and 3 indicate the same or equivalent parts.

A governor pulley 1 and a pendulum bone 8 are rotatably supported around an axis T, and these are connected to pins 9 and 1 fixed to each other.
The pendulum 16 is rotatably supported on the pendulum bone 8 around the shaft 15 while being elastically engaged in the rotational direction via the vibration isolating spring 11 that is engaged with the vibration isolation spring 11. It is similar to

A flange-shaped brake plate 24 is fixed to one side of the boss portion of the governor pulley 1, and is movable in the axial direction of the shaft 7 along the cylindrical portion of the brake plate 24.
A rotatably annular brake piece 25 facing the annular portion of
is located.

The material of the brake plate 24 is a rust-proof material such as stainless steel, and the material of the brake piece 25 is as follows.
A material with a small friction coefficient on the friction surface with the brake plate 24,
For example, synthetic resin, oil-impregnated bearing material, etc. are used, and the brake piece 25 has a two-part structure as shown in FIG. 7 for easy maintenance and inspection.

A circular hole 26 is bored in the brake piece 25, and this circular hole 2
The threaded portion 28 at the other end of the rod 27, which has one end engaged with the pendulum bone 8, is screwed into the pendulum bone 8 and fixed with a lock nut 29.

That is, the brake piece 25 is supported by the rod 27 so as to be movable in the direction of the axial force of the shaft 7 and not rotate around the shaft 7, and furthermore, there is a space between the stopper part 30 of the rod 27 and the brake piece 25. The braking plate 24 is pressed by the elastic force of the coil spring 31 provided.

Further, a brake plate 24 is provided on the outer periphery of the boss portion of the governor pulley 1.
An annular cover 32 is provided to cover the outer periphery of the braking surface of the braking piece 25.

This annular cover 32 is designed to facilitate maintenance and inspection.
It has a two-part structure as shown in FIG. 8, and is molded from a transparent synthetic resin material.

According to this embodiment, the braking plate 24 and the braking piece 25 that generate frictional resistance are arranged at the boss portion of the governor pulley 1, and the outer periphery thereof is covered by the cover 32, so that dust or particles flying from the governor rope 2 are prevented. Since the braking plate 24 is not affected by rope oil and the like, and since a non-rust material is used for the brake plate 24, rust will not occur.

As a result, stable frictional resistance can be maintained.

Also, loosen the lock nut 29 and rotate the rod 27,
By adjusting its axial position, the coil spring 3
Since the elastic pressing force of 1, that is, the frictional force between the brake plates 24 and 25 can be easily adjusted, the frictional force can always be maintained at an appropriate value.

Furthermore, as described above, the braking surfaces of the braking plate 24 and the braking piece 25 are arranged at the boss portion, that is, the small diameter portion, of the governor pulley 1, and a material with a small coefficient of friction for the braking surface is selected, so that the braking piece 25 is The pressing force of the pressing coil spring 31 can be increased.

As a result, it becomes easy to set the frictional force, and the rod 27
The influence of the frictional force between the brake member and the brake piece 25 on the pressing force of the coil spring 31 can be reduced to a negligible extent.

Therefore, during acceleration and deceleration in normal operating conditions, the frictional resistance causes the rotation of the governor pulley 1 to be transmitted from the brake plate 24 to the pendulum bone 8 via the brake piece 25, that is, the rod 27, without relative rotation. If the resistance is adjusted, the speed of the pendulum bone 8 as shown in the curve shown in Fig. 4 will not reach an excessive speed due to bar shooting and will have the same speed change as the governor pulley 1, so it will be stable. Accurate transient characteristics can be obtained.

In addition, the natural frequency determined by the vibration isolation spring 11, the pendulum bone 8, and the moment of inertia of the pendulum 16 around the axis 7 is selected to be lower than the natural frequency of the cage 4, so that when the cage is operated at the rated speed. When the cage 4 is violently vibrated and large vibrations are transmitted to the governor pulley 1 via the governor rope 2, the governor pulley 1 due to the frictional resistance
The integral movement of the pendulum bridge 8 becomes impossible, and the vibration isolation spring 1
1, the vibration isolating effect is exerted, and the large vibrations transmitted to the governor pulley 1 are hardly transmitted to the pendulum bridge 8.

In the above embodiment, the brake plate 24 is fixed to the governor pulley 1 side, and the brake piece 25, rod 27 and coil spring 3
1 was installed on the pendulum bridge 8 side, but on the contrary, the brake plate 24
can also be fixed to the pendulum bridge 8 side, and the brake piece 25, rod 2T, and coil spring 31 can be installed to the governor pulley 1 side, and the same effect can be obtained in this case as well.

Furthermore, the rod 27 and the coil spring 31 for pressing the brake piece 25 can be installed not only in one set as in the embodiment described above, but also in a plurality of sets.

FIG. 9 shows an example of this case.

That is, the rod 2 is located at a radially symmetrical position of the pendulum bridge 8.
7 and a coil spring 31 are respectively installed, and the brake piece 25 is pressed at two locations in the radial direction by these two sets of pressing devices.

Therefore, the brake piece 25 is reliably pressed against the brake plate 24 without unevenly touching it.

In addition, the brake piece 25 or the brake plate 24 (in the figure, the brake piece 2
If an annular protrusion 33 in the axial direction is integrally formed on the outer periphery of 5) so as to cover the outer periphery of the braking surface, the same effect as the telekinetic bar 32 shown in FIG. 6 can be achieved.

As explained above, according to the present invention, since the braking piece is provided on the boss of either the governor pulley or the pendulum bridge, it is less affected by lobe oil etc. scattered from the governor rope, and stable friction is achieved. In addition to providing resistance, the elastic pressing force of the brake piece can be reduced to a large extent, making it easy to set the frictional force.

Furthermore, since the elastic pressing force of the brake piece can be adjusted, the frictional force can always be maintained at an appropriate value.

[Brief Description of the Drawings] Figure 1 is a schematic configuration diagram showing the relationship between the elevator and the governor, Figure 2 is a front view of a conventional governor, Figure 3 is a sectional view taken along line A-A in Figure 2, and FIG. 4 is a characteristic diagram showing an example of speed transient response characteristics of a conventional governor, FIG. 5 is a front view of a governor according to an embodiment of the present invention, and FIG. 6 is a sectional view taken along line B-B in FIG. FIG. 7 is a front view showing an example of a brake piece used in the present invention, FIG. 8 is a front view showing an example of a cover used in the present invention, and FIG. 9 is a main view of a governor according to another embodiment of the present invention. FIG. 1... Governor pulley, 2... Governor rope, 8... Pendulum holder, 11... Vibration isolation spring, 16... Pendulum, 24... ...braking plate, 25...braking piece, 27...rod, 28...threaded part, 31...coil spring, 32... . . . Cover, 33 . . . Annular protrusion.

Claims (1)

[Scope of Claims] 1. A governor pulley around which a governor rope is wound and a pendulum bridge rotatably supporting a pendulum are elastically coupled in the rotational direction by a vibration isolation spring, and the governor pulley and pendulum bridge are connected around the axis. In the elevator governor, a brake piece is provided on one side of the governor pulley and the pendulum bridge and is pressed by the other force side of the brake piece to generate a frictional force. is provided on the boss portion of one of the governor pulley and the pendulum bridge so as to be movable in the axial direction and restrained in the rotational direction, and with an adjustable elastic force, the boss portion of the governor pulley and the pendulum bridge is Kahana for suru eleheta characterized by being pressed to the side. 2. A governor pulley around which a governor rope is wound and a pendulum bridge that rotatably supports a pendulum are elastically coupled in the rotational direction by a vibration isolation spring, and the governor pulley and pendulum bridge are rotatably supported around an axis. In the elevator governor, the brake piece is provided on one side of the governor pulley and the pendulum bridge, and the brake piece is pressed against the other force side of the governor pulley and the pendulum bridge to generate a frictional force. The boss portion of either one of the governor pulley and the pendulum bridge is provided so as to be movable in the axial direction and restrained in the rotational direction, and pressed against the other side of the governor pulley and the pendulum bridge by an adjustable elastic force. A governor for an elevator, characterized in that a brake plate made of a rust-proof material is provided on either side of the pendulum bridge, facing the brake piece. 3. The elevator governor according to claim 2, wherein the brake piece and the brake plate are substantially annular. 4% The elevator according to claim 3, characterized in that the brake pieces are pressed at radially symmetrical positions.
governor. 5. A governor pulley around which a governor rope is wound and a pendulum bridge that rotatably supports a pendulum are elastically coupled in the rotational direction by a vibration isolation spring, and the governor pulley and pendulum bridge are rotatably supported around an axis. In the elevator governor, the brake piece is provided on one side of the governor pulley and the pendulum bridge, and the brake piece is pressed against the other side of the governor pulley and the pendulum bridge to generate a frictional force. It is provided on one of the boss parts so as to be movable in the axial direction and restrained in the rotational direction, and is pressed against the other force side of the governor pulley and the pendulum bridge by an adjustable elastic force, and further the brake piece A governor for an elevator, characterized in that the outer periphery of the contact surface with either the other force side of the governor pulley or the pendulum bridge, on which the brake piece is pressed, is covered with a cover. 6. The elevator governor according to claim 5, wherein the cover is integrally formed on either the brake piece or the other force side on which the brake piece is pressed.