JP2004149231A - Emergency stop device of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stop a car before a car speed is increased when a rope slip or a brake slip occurs in an elevator. <P>SOLUTION: A tacho-generator 14 for measuring the rotational speed of a main rope 8 and a tacho-generator 15 for measuring the rotational speed of a drive sheave 11 are installed on the main rope and the drive sheave 11 to measure the slip amount of the main rope 8 relative to the drive sheave 11. Also, the slip amount of an electromagnetic brake 10 is measured by outputs from the tacho-generators 14 and 15 and the electromagnetic brake 10 installed on an electric motor 9. When a computer 32 determines that an abnormality occurs, it operates a speed control rope stop device 40 to clamp a speed governing rope 3 so as to operate an emergency stop device 5. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency stop device for an elevator, and more particularly to an emergency stop device for stopping a speed governing rope and operating an emergency stop device when a car abnormally moves up and down in a rope traction type elevator.
[0002]
[Prior art]
Elevators are required to be equipped with various safety devices, one of which is "a device for automatically stopping the car from descending within 1.4 times the rated speed". The emergency stop device corresponds to this and operates when the car moves abnormally fast due to some abnormality. A governor is provided as a device for detecting whether the car is moving abnormally fast and operating the safety device.
[0003]
The configuration of such an elevator is, for example, as shown in FIGS. First, the overall configuration of the elevator will be described with reference to FIG. Generally, the governor 1 is installed in the machine room 2, and the safety gear 5 is arranged below the car 6. When the moving speed of the car 6 becomes abnormally high, the governor 1 operates to hold the governing rope 3. When the car 6 further moves in this state, the emergency stop lever 4 fixed to the speed governing rope 3 is pulled up, and the emergency stop device 5 operates to grasp the guide rail 7 and stop the car 6.
[0004]
Next, the structure of the governor will be described with reference to FIGS. The governing rope 3 connected to the car 6 rotates the governor main wheel 21. When the speed of the car 6 becomes abnormally high, the pendulum 22 of the governor main wheel 21 opens outward due to the centrifugal force, the overspeed switch 23 is operated, and the power of the motor 9 for winding up the main rope 8 is cut off and the motor 9 is turned off. , The car 6 is stopped. If the car 6 cannot be stopped for any reason and moves further, the pendulum 22 of the governor main wheel 21 is further opened, the hook 25 catching the rope catch 24 is removed, and the rope catch 24 moves downward, and the speed control is performed. The safety device 5 is operated by grasping the rope 3.
[0005]
The conventional emergency stop device 5 of the elevator operates the emergency stop device 5 when the speed of the car 6 reaches a certain speed or more by the mechanical switch as described above. The car 6 has moved, and the impact of stopping the car 6 has caused discomfort to passengers.
[0006]
Therefore, an emergency stop device has been proposed in which the deceleration of the car during an emergency stop is not excessive. For example, when an emergency stop signal is issued, an emergency stop torque required to stop the car at the remaining distance from the current position of the car to the terminal floor ahead in the driving direction is calculated, and further, the car is kept stationary. And the required stationary torque is calculated, and the larger one of them is selected as the required braking torque, and the required braking torque is generated by the minimum number of brake devices so that the car deceleration does not become excessive. There is a device for emergency stop of an elevator (see Patent Document 1).
[0007]
In addition, there has been proposed an apparatus for measuring the amount of slip of the main rope with respect to the drive sheave in the event that the main rope slips due to wear of the drive sheave and the main rope. For example, a device that detects the stop position of the drive sheave by a photoelectric device each time the car stops on a specific floor, and detects the magnitude of the displacement of the drive sheave as a slip amount between the drive sheave and the main rope. (See Patent Document 2).
[0008]
[Patent Document 1]
JP 2001-278572 A (FIG. 1)
[Patent Document 2]
JP-A-7-10412 (FIG. 1)
[0009]
[Problems to be solved by the invention]
Among the above, the technology disclosed in Patent Document 1 relates to an improvement in an emergency stop device that smoothly stops a car after an overspeed switch or a rope catch provided in a governor operates. The car has to stop at the position lowered from the position where the abnormality occurred.
[0010]
Further, the technology disclosed in Patent Document 2 is used for the purpose of monitoring an abnormality such as measuring the amount of slip and recording or displaying if there is an abnormality. Since an abnormality cannot be confirmed, there is a problem that if a slip occurs continuously, an abnormal state cannot be grasped until the vehicle descends to the pit.
[0011]
An object of the present invention is to be able to stop a car before speeding up when an abnormality occurs in an elevator.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, in the emergency stop device for an elevator according to the present invention, when an abnormal elevating operation of the car occurs and the elevating speed of the rope exceeds a predetermined value, the speed control by the brake operating device is performed. In an emergency stop device for an elevator that stops a rope and operates an emergency stop device, when a main rope slips a predetermined amount or more with respect to a drive sheave and a car moves, a speed control rope stop device stops the speed control rope, The car is emergency-stopped by operating the stopping device.
[0013]
Further, the emergency stop device for an elevator according to the present invention operates the emergency stop device by stopping the speed governing rope by the brake operating device when an abnormal elevating operation of the car occurs and the elevating speed of the rope exceeds a predetermined value. In the elevator emergency stop device, when the electromagnetic brake of the electric motor driving the main rope slips by a predetermined amount or more and the car moves, the speed control rope is stopped by the speed control rope stop device, and the emergency stop device is operated to operate the car. It is characterized by an emergency stop.
[0014]
Still further, in the emergency stop device for an elevator according to the present invention, the speed governing rope stopping device includes a holding portion and an extruding portion disposed on both sides of the speed governing rope so as to face each other, and the holding portion is fixed. The pusher presses the side surface of the governing rope, and pushes the governing rope against the holding portion to stop the governing rope.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1
Hereinafter, an elevator emergency stop device according to a first embodiment of the present invention will be described with reference to the drawings.
[0016]
First, the overall configuration of the present invention will be described with reference to FIG. Members that are the same as or similar to the members shown in the above-described conventional technology are denoted by the same reference numerals, and description thereof is omitted. 3, a drive sheave 11 attached to the electric motor 9 is driven by electric power supplied from a power source (not shown). A main rope 8 is wound around the drive sheave 11 and the deflecting wheel 12, and a weight 13 is suspended from the car 6 at both ends of the main rope 8. The main rope tach generator 14 is provided for measuring the rotation speed of the main rope 8, and the drive sheave tach generator 15 is provided for measuring the rotation speed of the drive sheave 11. In addition to the electromagnetic brake 10 and the like installed in the electric motor 9 shown in the prior art, a speed-control rope stopping device 40 for holding the speed-control rope 3 and operating the emergency stop device 5 is provided. A control device 31 having a computer 32 for controlling the operation of the elevator is installed in the machine room 2. The computer 32 includes a ROM 34, a CPU 35, and a RAM 36, receives operation outputs of the electromagnetic brake 10, the main rope tach generator 14, and the drive sheave tach generator 15 via the I / O port 33, and stops the speed control rope. An operation command is transmitted to the device 40. In addition, the computer 32 transmits the operating information of the elevator to the monitoring center 37 via the I / O port 33.
[0017]
FIG. 4 is a detailed view showing the speed governing rope stopping device 40 according to the first embodiment, and includes a rope holding portion 41 and a rope pushing portion 42 which are disposed on both sides of the speed governing rope 3 so as to face each other. The rope holding part 41 is fixedly installed in the machine room 2, for example. The rope push-out part 42 is installed at a position where it can press the side surface of the governing rope 3 and press the governing rope 3 against the rope holding part 41.
[0018]
In FIG. 4, the driving source of the rope pushing unit is a motor 43, and the motor 43 rotates according to an operation command from the computer 32. A ball screw 44 is attached to a rotation shaft of the motor 43, and the rope pushing-out portion 42 is pushed out via a ball nut 45 by forward rotation of the motor shaft.
[0019]
Next, the operation of the emergency stop device for an elevator according to the first embodiment will be described. As described in the related art, the emergency stop system using the overspeed switch 23 and the rope catch 24 provided in the governor 1 stops the car 6 unless the moving speed of the car 6 increases. And the impact of the stop gives passengers discomfort. Further, if the sheave grooves of the main rope 8 or the drive sheave 11 are worn, the frictional force of the rope with respect to the sheave is reduced. For example, in a case where a passenger is riding too much, the main rope 8 slips due to insufficient traction. A phenomenon occurs in which the car 6 descends. In this case, if the speed of the car 6 does not exceed a certain level, the overspeed switch 23 and the rope catch 24 provided in the governor 1 do not operate, and the slip continues to the hydraulic shock absorber 16. It is also possible.
[0020]
In the first embodiment, an operation signal is received from the tachogenerator 14 installed to measure the rotation speed of the main rope 8 and the tachogenerator 15 installed to measure the rotation speed of the drive sheave 11, For example, when (a) the main rope tach generator 14 has an output and the drive sheave tach generator 15 has no output, (b) the output of the drive sheave tach generator 15 If the output is large, it is possible to recognize that a rope slip has occurred. The computer 32 is set so that the CPU 35 compares the received operation signal with a slip condition registered in advance by the CPU 35 to determine that a roll slip has occurred. When the computer 32 determines that a roll slip has occurred, an operation command is transmitted to the drive motor 43 of the rope push-out unit 42, and the rope holding unit 41 and the rope push-out unit 42 grasp the speed-control rope 3, thereby causing the speed-control rope 3 to move. It stops, and the safety gear 5 operates.
[0021]
Therefore, since the emergency stop can be performed when the main rope 8 slips, the car 6 can be stopped before the speed is generated without generating an impact.
[0022]
Embodiment 2
In the first embodiment, the rotation speed of the main rope 8 is measured by the tachometer 14 for the main rope, and the rotation speed of the drive sheave 11 is measured by the tachometer 15 for the drive sheave. The case where the generated amount is detected and the car 6 can be stopped without generating an impact has been described. In the second embodiment, the operation output of the electromagnetic brake 10 is taken into the computer 32 in addition to the tachogenerators 14 and 15.
[0023]
According to the second embodiment, for example, when the power supply to the electromagnetic brake 10 is cut off and a braking operation is performed, an output is generated in the tachogenerator 14 for the main rope or the tachogenerator 15 for the drive sheave. For example, it is possible to recognize that the electromagnetic brake 10 is slipping. Further, the computer 32 is set so that the CPU 35 compares the received operation signal with a slip condition registered in advance by the CPU 35 to determine that a brake slip has occurred. When the computer 32 determines that a brake slip has occurred, as in the first embodiment, an operation command is transmitted to the drive motor 43 of the rope pushing section, and the rope holding section 41 and the rope pushing section 42 grip the speed controlling rope 3. As a result, the speed control rope 3 is stopped, and the safety gear 5 is operated.
[0024]
Therefore, an emergency stop can be performed when the electromagnetic brake 10 slips, so that the car 6 can be stopped before a speed is generated without generating an impact.
[0025]
Embodiment 3
In the first or second embodiment, it is possible to detect a point in time when the slip of the main rope 8 or the slip of the electromagnetic brake 10 occurs, and to stop the car 6 before the speed is generated without generating an impact. I mentioned the case. In this case, the case where the motor 43, the ball screw 44 and the ball nut 45 shown in FIG. In the third embodiment, for example, as shown in FIGS. 5 and 6, the rope push-out portion 42 of the speed control rope stopping device 40 is driven by a pinion 47 and a rack 48 driven by a motor 46 or by a pneumatic cylinder 49.
[0026]
As described above, for the method of driving the rope push-out unit 42, for example, various methods can be selected depending on the installation environment, cost, and the like, and an electric signal such as a solenoid or a hydraulic cylinder other than the above is converted into mechanical energy. The same effect can be obtained with any actuator as long as it can convert.
[0027]
The tachogenerators 14 and 15 in the first to third embodiments may be of any type as long as the movement amount and the movement speed can be measured. Of course, a contact type or a non-contact type (for example, an electromagnetic rotation detector, a magnetoelectric rotation detector, a photoelectric rotation detector, etc.) may be used.
[0028]
【The invention's effect】
As described above, in the present invention, when the main rope slips with respect to the drive sheave and when the electromagnetic brake slips, the car stops at the time when the slip occurs. Even if it does, the car can be stopped without generating an impact.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the overall configuration of an elevator.
FIG. 2 is a diagram illustrating an embodiment of a configuration of a governor.
FIG. 3 is a diagram showing an embodiment of the present invention in an elevator.
FIG. 4 is a view showing an embodiment of a speed control rope stopping device.
FIG. 5 is a view illustrating an example of various embodiments of a rope pushing-out unit of the speed control rope stopping device.
FIG. 6 is a view illustrating an example of various embodiments of a rope push-out unit in the speed control rope stopping device.
[Explanation of symbols]
1 speed governor, 2 machine room, 3 governing rope, 4 emergency stop lever, 5 emergency stop device, 6 car, 7 guide rail, 8 main rope, 9 motor, 10 electromagnetic brake, 11 drive sheave, 12 deflecting car, 13 counterweight, 14 tachogenerator (rotational speed measuring device for main rope), 15 tachogenerator (rotating speed measuring device for drive sheave), 16 hydraulic shock absorber, 21 governor main wheel, 22 pendulum, 23 overspeed switch, 24 rope catch, 25 hooks, 31 control device, 32 computer, 33 I / O port, 34 ROM, 35 CPU, 36 RAM, 37 monitoring center, 40 speed control rope stopping device, 41 rope holding unit, 42 rope pushing unit, 43 motor, 44 ball screw, 45 ball nut, 46 motor, 47 pinion, 48 rack, 49 air Pressure cylinder.

Claims (3)

In an emergency stop device of an elevator, when an abnormal elevating operation of the car occurs and the elevating speed of the rope exceeds a predetermined value, the braking device stops the governing rope to operate the emergency stop device,
An elevator characterized in that when the main rope slips with respect to the drive sheave by a predetermined amount or more and the car moves, the speed control rope is stopped by the speed control rope stopping device, and the emergency stop device is operated to stop the car emergency. Emergency stop device. In an emergency stop device of an elevator, when an abnormal elevating operation of the car occurs and the elevating speed of the rope exceeds a predetermined value, the braking device stops the governing rope to operate the emergency stop device,
When the car moves due to the electromagnetic brake of the electric motor driving the main rope slipping by a predetermined amount or more, the speed control rope is stopped by the speed control rope stopping device, and the emergency stop device is operated to stop the car in an emergency. Elevator emergency stop device. The emergency stop device for an elevator according to claim 1 or 2,
The governing rope stopping device,
A holding portion and an extruding portion are provided on both sides of the governing rope so as to be opposed to each other, the retaining portion is fixedly installed, and the pushing portion presses a side surface of the governing rope, and the governing rope is moved. An emergency stop device for an elevator, wherein the emergency rope is stopped by urging a holding portion.

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