JPH072451A - Governor erroneous operation preventing device for elevator - Google Patents

Abstract

PURPOSE:To prevent a governor from its erroneous operation by providing a suppressor for suppressing vertical vibration of a weight pulley for giving tension to a governor rope wound to a governor pulley, in the case of providing a governor device containing an overspeed detector driven by the governor pulley. CONSTITUTION:In the case of operating a car 4 lifted through a sheave 3 and a main rope 6 by driving an electric motor 2 with a command of an electric motor controller 1, in a governor device, linear motion of a governor rope 9 connected by a rod 7 to the car 4 is converted into a circular motion by a governor pulley 8, to provide a pendulum displaced by centrifugal force in accordance with a speed of the governor pulley 8, and when a car speed arrives at a specific value, an electrical contact is actuated by displacing the pendulum to stop an elevator. Here, a vibration preventing device of using a friction force vibration preventing mechanism for pressing contactors 12a, 12b is additionally provided in a weight pulley 10 provided so as to give tension to the governor rope 9, thus to suppress governor pulley vibration so as to prevent a governor from its erroneous operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for preventing malfunction of an elevator governor, and more particularly to suppressing resonance vibration of a governor device.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Publication No. 1-17572, a method for preventing the governor rope from swinging to prevent malfunction of the governor, as described in Japanese Utility Model Publication No. 54-50375. There has been proposed a method of preventing a malfunction of a governor in which a vibration damping element is added to a pendulum portion that converts a governor pulley rotation speed into a displacement.

[0003]

In the above-mentioned conventional technique, the structure is complicated, and adjustment is required for each specific period in order to maintain the vibration damping effect, and maintenance adjustment consumes a lot of time. Further, the vibration of the governor device has not been studied, which is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator control device having a high safety by always suppressing the governor pulley vibration to prevent the governor malfunction even if the elevator car vibration occurs.

[0005]

The above object can be achieved by providing a vibration damping device for suppressing vertical vibration of the weight pulley portion.

[0006]

[Function] When an external force such as a passenger jumping in the car is applied, the car vibrates vertically, and this vibration is transmitted to the governor pulley by the governor rope. At this time, the governor pulley undergoes speed fluctuations, and particularly vibrates greatly when a frequency corresponding to the resonance frequency generated by the spring system of the governor rope occurs in the car. This causes the governor switch to operate even though the car speed is not overspeed.
In order to eliminate such inconvenience, in order to suppress the vertical vibration of the weight pulley part that gives tension to the governor rope when the car vibration is transmitted to the governor pulley by the governor rope, the component part that is displaced in the vertical direction of the weight pulley part is used. It operates so that the equivalent mass increases due to frictional force, hydraulic damper force, electromagnetic force, etc., and acts to suppress the resonance vibration of the governor rope system and prevent the malfunction of the governor.

[0007]

EXAMPLES Examples of the present invention will be described below.

In FIG. 1, reference numeral 1 is a motor control device, and 2 is a control device.
Is an electric motor, 3 is a sheave connected to the electric motor 2, 4 is an elevator car, 5 is a counterweight, 6 is a rope, 7 is a lot for connecting a car and a governor rope, 8
Is a governor pulley for converting the car speed into rotary motion by the governor rope, 9 is a governor rope driven by the car, 16 is a governor pulley for converting the car speed into rotary motion by the governor rope, 10 is a weight pulley which gives tension to the governor rope, 10a Is a pulley, 11 is an overspeed detector of the governor device, 10b is a weight, 12 is a contactor that gives a frictional force to the weight 10b, 13 is an adjuster for adjusting the frictional force, 14 is a threaded lot, and 15 is a hoistway. is there. Figure 2 shows the overspeed detector of the governor.
11a is a pendulum that is displaced by the speed of the governor pulley, 1
1b is an adjusting spring for adjusting the displacement of the pendulum, 11c is the pendulum 1
An electrical contact that operates by displacement of 1a, 11d is a pendulum 11a
The reference numeral 11e represents a catch weight which is operated by the displacement of the above, and 11e represents a catch weight which catches the governor rope 9 by the operation of the catch lever 11d.

FIG. 3 shows the vibration characteristics of the governor pulley when the elevator is about 40 m long and the car is near the lowest floor. The horizontal axis is the vibration frequency and the vertical axis is the amplitude ratio of the governor pulley to the car. is there.

Next, the operation will be described.

While the elevator is stopped, or the electric motor 2 is controlled by a command from the electric motor control device 1, the car 4 driven via the sheave 3 and the main rope 6 is moved up or down. The governor device has a pendulum 11a that converts the linear motion of the governor rope 9 connected to the car 4 in lot 7 into a circular motion by the governor pulley 8 and is driven by the governor pulley 8 and displaced by centrifugal force according to its speed. When the car speed exceeds the rated speed and reaches the first predetermined value, the displacement distance of the pendulum 11a becomes the first predetermined value, the electric contact 11c operates, and the electric control circuit is cut off (not shown) to stop the elevator. Further, even if the electric control circuit is cut off, the car does not stop and the pendulum 11a is reached when the car speed reaches the second predetermined value.
Of the catch lever 11d
Is operated to drive the catch weight 11e to catch the governor rope 9 and an emergency stop device (not shown) mounted on the car 4 catches the guide rail to stop the car 4. However, in the governor device set in this way, when the speed of the car 4 is running at the rated speed or less, the electrical contact 11c malfunctions, the electric control circuit is cut off, and the car 4 stops.

The main cause of the malfunction of the electrical contact 11c is that the passenger performs an operation such as a jump in the car 4 and an external force is applied to the car, which causes vertical vibration of the car. This vibration is transmitted to the governor pulley by the governor rope. To be done. At this time, the governor pulley vibrates more than the vibration of the car, as shown in FIG. 3, when speed fluctuations occur, and particularly when a frequency corresponding to the resonance frequency generated by the spring system of the governor rope occurs in the car. Therefore, even though the car speed is not overspeed, the governor switch operates to stop the operation of the elevator. Further, if the passenger performs a jumping motion or the like in the car 4 even when the elevator is stopped, similarly to the above, if a frequency matching the resonance frequency generated by the governor rope spring system is generated in the car, the governor pulley Vibrates greatly and the governor switch operates. Therefore, the elevator cannot be started even if the next start command is issued.

The operation of the present invention for solving this problem will be described. In the governor device, a weight pulley 10 composed of a pulley 10a and a weight 10b is installed below the hoistway in order to apply tension to the governor rope and prevent lateral movement of the governor rope. The weight pulley 10 has a bracket (not shown) for restricting horizontal movement in order to prevent lateral movement of the governor rope, but there is no restriction for vertical movement. By the way, the vibration generated in the car is transmitted to the governor pulley via the governor rope as rotational vibration. At this time, the weight pulley 10 generates vibration in the pulley rotation direction and the vertical direction. A device that gives a damper effect to the vertical vibration of the weight pulley, for example, a device that uses a frictional vibration damping mechanism that presses the contacts 12a and 12b against the weight 10b is installed, and the hoistway walls 15a and 15b and the weight 10b are installed. Friction force adjuster 13 for adjusting the displacement between
If the frictional force is adjusted to a proper value by a, 13b, etc., the weight pulley 10 operates equivalently to increase the mass, and the vertical vibration of the weight pulley 10 is suppressed. As a result, the resonance vibration of the governor rope system can be suppressed and the vibration of the governor pulley 7 can be reduced as shown in the characteristic of the present invention shown in FIG. 4, and the electrical contact 11c of the acceleration detection unit 11 of the governor device malfunctions even if it is not overspeed. It is possible to prevent the phenomenon.

As described above, according to the present invention, even when the elevator is stopped or running, even if an external force such as a jump of passengers occurs in the elevator car, the governor pulley vibration is always suppressed to prevent the governor device from malfunctioning. It is possible to provide an elevator control device that is highly safe and reliable.

A second embodiment according to the present invention is shown in FIG.
This method uses a hydraulic damper device 18 as means for suppressing vertical vibration of the weight pulley 10.
The hydraulic damper device 18 is installed between the weight 10b and the hoistway. The method using the hydraulic damper device has advantages that vertical vibration of the weight pulley 10 can be easily suppressed, model setting and installation can be relatively easy, and workability is good.

A third embodiment according to the present invention is shown in FIG.
This method uses an electromagnet device as a means for suppressing vertical vibration of the weight pulley 10. The electromagnet device includes an iron core 19 for generating an electromagnetic force in the vertical vibration direction of the weight pulley 10, a coil 20 for generating an electromagnetic force on the iron core 19, and a control circuit 2 for giving a control current to the coil 20.
The vertical vibration of the weight pulley 10 is suppressed by using a vibration isolation mechanism composed of the control circuit 2 and the command circuit 24. in this way,
The anti-vibration mechanism using the electromagnet has an advantage that the vibration suppressing effect is large with simple control because it can be easily operated electrically. Also,
As one method for increasing the vertical vibration suppression effect of the weight pulley 10, an accelerometer 25 for detecting the vertical vibration of the weight 10b is installed, and the vertical vibration component of the weight pulley 10 is sent to the adder 23 of the input section of the control circuit 22. It may be configured to return. With this configuration, the vertical vibration component of the weight pulley 10 is applied to the control circuit 22 and vibration suppression control is performed, so a high vibration suppression effect can be expected.

Further, as shown in FIG. 7, an electromagnet device is installed on the hoistway wall in the horizontal direction of the weight pulley 10 so that a horizontal electromagnetic force is applied to the weight 10b so that the weight pulley 10 vibrates vertically. You may comprise so that it may be suppressed. At this time, the guide 21 may be provided so that the weight 10b does not move horizontally and come into contact with the electromagnet. Further, the guide element 21 may be configured to apply a frictional force so that the vertical vibration of the weight pulley 10 can be more effectively prevented so as to be used together with the electromagnetic force.

Further, as shown in FIG. 8, the governor pulley 8
Of the governor pulley 8 may be further effectively suppressed by a configuration in which the detector 26 detects the vibration component of the above, the adjuster 27 adjusts the feedback signal, and the feedback signal is returned to the input adder 23 of the control circuit 22. .

As shown in FIG. 9, the anti-vibration device is a governor device mechanism that is widely used in hydraulic elevators.
That is, the same effect can be obtained even when the governor pulley 8 and the overspeed detector 11 are installed below the hoistway. In the hydraulic elevator, the controller 36 controls the electric motor 3
5 to control the rotation of the hydraulic pump 33 to supply or discharge the pressure oil to the cylinder 30 through the oil tank 34 and the electromagnetic valve 32, and drive the car 4 through the plunger 31, the pulley 29 and the rope 6. Further, although the electromagnet is used as the vibration prevention mechanism in FIG. 9, a friction force or hydraulic damper may be used.

In the description of the electromagnet device of the embodiment, the method of installing the electromagnet device on the hoistway side has been described.
The same effect can be obtained by installing the electromagnet device on the weight 10b side of the weight pulley 10 and using a magnetic body on the hoistway side.

[0021]

According to the present invention, even when the elevator car is stopped or running, even if an external force such as a jump of passengers occurs in the elevator car, the governor pulley vibration is always suppressed to prevent malfunction of the governor device. However, an elevator control device with high safety and reliability can be provided.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an elevator apparatus showing an embodiment of the present invention.

FIG. 2 is an explanatory view of a governor device of the present invention.

FIG. 3 is a characteristic diagram of the present invention.

FIG. 4 is a characteristic diagram of the present invention.

FIG. 5 is an explanatory view of an elevator apparatus showing a second embodiment of the present invention.

FIG. 6 is an explanatory diagram of an elevator apparatus showing a third embodiment of the present invention.

FIG. 7 is an explanatory view of an elevator apparatus showing a fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram of an elevator apparatus showing a fifth embodiment of the present invention.

FIG. 9 is an explanatory view of an elevator apparatus showing a sixth embodiment of the present invention.

[Explanation of symbols]

2 ... motor, 3 ... sheave, 4 ... car, 6 ... rope,
8 ... Governor pulley, 9 ... Governor rope, 10 ... Weight pulley, 10a ... Pulley, 10b ... Weight, 11 ... Governor overspeed detector, 12 ... Contactor, 13 ... Friction force adjuster.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoru Sasaki 1-6-6 Kandanishiki-cho, Chiyoda-ku, Tokyo Within Hitachi Building System Service Co., Ltd. (72) Inventor Hiromi Inaba 7-1-1 Omikacho, Hitachi City Hitachi Ltd., Hitachi, Ltd.

Claims (9)

[Claims] 1. A car driven in an ascending and descending direction,
In an elevator apparatus using a governor device including a governor rope connected to the car, a governor pulley on which the governor rope is wound, a weight pulley for applying tension to the governor rope, and an overspeed detecting device driven by the governor pulley. An elevator governor malfunction prevention device comprising a vibration damping device for suppressing vertical vibration of the weight pulley. 2. The malfunction preventing device for an elevator governor according to claim 1, wherein the anti-vibration device is a frictional anti-vibration mechanism that presses a contact against a vertically displacing component of the weight pulley part. 3. The malfunction preventing device for an elevator governor according to claim 1, wherein the vibration isolator is a vibration isolating mechanism that uses a hydraulic damper device in a component that is vertically displaced of the weight pulley portion. 4. The elevator governor malfunction preventing device according to claim 1, wherein the vibration isolator is a vibration isolating mechanism that uses an electromagnet device in a component that is vertically displaced of the weight pulley portion. 5. The elevator governor malfunction prevention according to claim 1, wherein the vibration isolating device is a vibration isolating mechanism using an electromagnet device on which electromagnetic force acts on a component part of the weight pulley portion which is vertically displaced. apparatus. 6. The elevator governor malfunction prevention device according to claim 1, wherein the vibration isolation device is provided with a feedback circuit for a vertical vibration component of the weight pulley portion in the electromagnet device. 7. The governor malfunction preventing device for an elevator according to claim 1, wherein the anti-vibration device is provided with a feedback circuit for a vibration component in a rotation direction of the governor pulley in the electromagnet device. 8. The elevator governor malfunction prevention device according to claim 1, wherein the governor pulley is installed near an upper portion of the hoistway and the weight pulley is installed near a lower portion of the hoistway. 9. The malfunction control apparatus for an elevator governor according to claim 1, wherein the governor pulley and the weight pulley are installed near a lower portion of a hoistway and a guide pulley is installed near an upper portion of the hoistway.