JPWO2006046284A1 - Elevator emergency stop device - Google Patents

Abstract

An object of the present invention is to provide an emergency stop device for an elevator that can reduce a delay with respect to an emergency stop operation while preventing malfunction of the emergency stop device. The guide rail, the governor, the governor rope, the connecting means having one end fixed to the governor rope, and the position of the other end of the connecting means. An emergency stop means for obtaining a braking force of the car by pressing against the rail, a malfunction prevention means for preventing a malfunction by applying a predetermined urging force to the operation of the emergency stop means, and a predetermined speed based on the speed of the car. And a malfunction prevention canceling means for canceling the predetermined urging force given by the malfunction prevention means when the speed exceeds the speed.

Description

  The present invention relates to a safety device for emergency stop of an elevator.

  A conventional elevator emergency stop device has a force that is relatively upward to the connecting means to which one end of the governor rope of the governor is fixed, such as by the car's inertia or the inertial force of the car at startup. Is applied and the operation exceeds a predetermined amount, the emergency stop device may operate.

  In order to deal with such a case, there is a technique relating to prevention of malfunction described in Japanese Patent Application Publication No. 5-319724 (Patent Document 1). According to this conventional technique, the pulling lever that rotates upward by the pulling force of the governor rope to move the brake element comes into contact with the cam and the cam at the shaft side end of the pulling lever. By constructing a curved seat and a coil spring that presses the curved seat with a predetermined force, when a predetermined force or more is applied to the governor rope and its operation exceeds a predetermined amount, It describes the technology that enables movement.

Japanese Patent Application Publication No. JP-A-5-319724

  However, in the case of the technique described in Patent Document 1, since a mechanism for preventing a malfunction is configured so that an urging force is applied to the pull-up lever, the brake is moved up by operating the pull-up lever. Requires a pulling force greater than a predetermined force, and the pulling lever requires a predetermined amount of rotation to overcome the cam shape, causing a delay in emergency stop operation. .

  The present invention is to solve the above problems, and to provide an emergency stop device for an elevator that can reduce a delay with respect to an emergency stop operation while preventing malfunction of the emergency stop device. With the goal.

  The present invention operates based on a car, a guide rail, a governor, a governor rope, a connecting means having one end fixed to the governor rope, and a position of the other end of the connecting means. An emergency stop means that presses against the guide rail to obtain a braking force of the car, a malfunction prevention means that prevents a malfunction by applying a predetermined urging force to the operation of the emergency stop means, and a speed of the car. On the basis of this, it is provided with a malfunction prevention releasing means for releasing the predetermined biasing force given by the malfunction prevention means when a predetermined speed is exceeded.

  According to such an emergency stop device for an elevator, the car, the guide rail, the speed governor, the speed governor rope, the connecting means having one end fixed to the speed governor rope, and the other end of the connecting means An emergency stop means for obtaining a braking force of the car by pressing against the guide rail, and a malfunction prevention means for preventing a malfunction by applying a predetermined urging force to the operation of the emergency stop means. And a malfunction prevention canceling means for canceling the predetermined biasing force provided by the malfunction prevention means when a predetermined speed is exceeded based on the speed of the car. The operation delay of the emergency stop means can be improved.

It is a figure which shows the emergency stop apparatus of the elevator of Example 1 of this invention. It is a structural diagram of the emergency stop means 7 constituting the emergency stop device for an elevator according to the first embodiment of the present invention. It is BB sectional drawing of the emergency stop means 7 which comprises the emergency stop apparatus of the elevator of Example 1 of this invention. FIG. 2 is an operation diagram of the connecting lever 14 and the malfunction preventing means 19 constituting the emergency stop device for an elevator according to the first embodiment of the present invention, and a sectional view of the electromagnetic switch 10 at that time. It is a figure which shows the time of operation | movement of the emergency stop means 7 which comprises the emergency stop apparatus of the elevator of Example 1 of this invention. It is the operation | movement figure of the connection lever 23 and the malfunction prevention means 19 which comprise the emergency stop apparatus of the elevator of Example 2 of this invention, and sectional drawing of the electromagnetic switch 24. FIG.

Explanation of symbols

1 guide rail, 2 cage, 3 governor rope, 4 governor, 5 governor rope tension wheel, 6 lifting rod, 7 emergency stop means, 8 switch, 9 control means, 10 electromagnetic switch, 11 emergency stop Lever, 12 Emergency stop means body, 13 Braking element, 14 Connecting lever, 15 Guide, 16 Roller, 17 Spring, 18 Pin, 19 Malfunction prevention part, 20 Spring, 21 Electromagnetic switch body, 22 Electromagnet. 23 connection lever, 23a hole, 24 electromagnetic switch 25 stopper, 26 mover, 26a pin, 27 electromagnetic switch body, 28 stopper, 29 indicator pin.

  The best mode for carrying out the invention will be described in the first and second embodiments.

FIG. 1 is a diagram illustrating an elevator safety device according to a first embodiment of the present invention.
A car 2 moves up and down in the hoistway along the guide rail 1. The endless governor rope 3 is disposed so as to be parallel to the guide rail 1, and is wound around the governor 4 and the governor rope tensioner 5. The governor rope 3 is fixed to one end of the pull-up bar 6 that is a connecting means, and the other end of the pull-up bar 6 is fixed to a component of the emergency stop means 7 so as to be rotatable. The component parts will be described later.

  On the other hand, the speed governor 4 changes the speed to a centrifugal force, such as a disk shape or a ball shape, and uses the action of the centrifugal force to rotate at a constant rotational speed regardless of fluctuations in the load of the rotating equipment. It is a device that adjusts the body and rotates in synchronization with the car's hoisting motor. For example, if the overspeed of the car is less than 1.3 times the rated speed and reaches the first speed, which is the predetermined speed, the hoisting motor is turned off and the electromagnetic brake is activated, but the overspeed of the car still drops. When the second speed is less than 1.4 times the rated speed, the speed governor 4 grasps the speed governor rope 3 and the pulling rod 6 is pulled up to operate the emergency stop means 7.

  Further, when the overspeed of the car 2 reaches the first speed, the governor 4 is provided with a switch 8 that is mechanically switched by the centrifugal force generated by the sheave. When the switch 8 is switched, the control means 9 electrically connected to the switch 8 is configured to operate the electromagnetic switch 10 in response to a turn-off signal among the turn-on / off signals from the switch 8. The switch 8 is conventionally provided, and a mechanical overspeed switch for turning off the power of the hoisting motor when the first speed is reached may be used. The switch 8, the control means 9, and the electromagnetic switch 10 are components of the malfunction prevention release means.

FIG. 2 is a structural diagram of the emergency stop means 7 constituting the elevator safety device according to the first embodiment of the present invention.
The other end of the pull-up bar 6 is rotatably fixed to one end of an emergency stop lever 11 which is a component of the emergency stop device 7. The emergency stop lever 11 is fixed to the emergency stop means body 12 of the emergency stop means 7 so as to be rotatable with respect to the hole 12a. The emergency stop lever 11 of the emergency stop means 7 is defined so that both one end of the brake 13 and one end of the connecting lever 14 can rotate. The emergency stop lever 11 is configured not to rotate to the left from the current position by the stopper 28, so that the pull-up bar 6 does not move downward from the current position.

The brake 13 will be described. 3 is a cross-sectional view of the emergency stop means 7 constituting the elevator safety device according to the first embodiment of the present invention, taken along the line BB in FIG.
As the pull-up bar 6 moves up, the two brake elements 13 connected to the emergency stop lever 11 move upward. Then, the brake element 13 is moved inward by a roller 16 rotatably fixed to the guide 15 and slides on the guide rail 1 to obtain a braking force. The guide 15 is fixed to the emergency stop means main body 12 via a spring 17, and the braking force due to the sliding of the guide rail 1 and the brake 13 is determined by the force applied to the guide 15 by the spring 17.

In FIG. 2, the other end of the connecting lever 14 is connected to a malfunction prevention means 19 via a pin 18. The malfunction prevention means 19 fixed to the car 2 is provided with a spring 20, and the other end of the connecting lever 14 is pulled by the urging force of the spring 20.
Therefore, in order to activate the emergency stop means 7 by raising the pull-up bar 6 by the governor 4 grasping the governor rope 3 in the prior art, the spring 20 provided in the malfunction preventing means 19 is used. Since it was necessary to overcome the urging force of this, the emergency stop operation was delayed.

In the first embodiment, the pin 18 constitutes one part of the electromagnetic switch 10 that is a malfunction prevention release unit, and the pin 18 reciprocates by the operation of the electromagnetic switch 10, whereby the connection lever 14 and the malfunction prevention unit 19 are operated. Can be connected and disconnected, and is not affected by the urging force of the malfunction prevention means 19, so that an emergency stop operation can be performed without causing a delay. This will be described in detail below.
FIG. 4 is an operation diagram of the connecting lever 14 and the malfunction prevention means 18 constituting the safety device for an elevator according to the first embodiment of the present invention, and a sectional view of the electromagnetic switch 10 at that time. 4A shows a normal state, FIG. 4B shows a state in which the speed governor 4 has reached the first speed, and FIG. 4C shows a state in which the speed governor 4 has reached the second speed. Show.

  4A, the lower diagram is an operation diagram of the connecting lever 14 and the malfunction prevention means 19, and the upper diagram is a sectional view of the electromagnetic switch 10 at that time. The pin 18 is connected to the electromagnetic switch body 21 via the spring 20, and a force is always applied to the electromagnetic switch body 21 by the spring 20. However, since a current always flows through the electromagnet 22 fixed to the electromagnetic switch body 21, the pin 18 is fixed in contact with the electromagnet 22. Therefore, since the pin 18 is normally on the electromagnet 22 side, the pin 18 is connected to the connecting lever 14 and a hole provided in the malfunction prevention means 19 by being fitted.

  In FIG. 4B, when the speed governor 4 reaches a first speed that is a predetermined speed, the switch 8 provided in the speed governor 4 is switched, and the control electrically connected to the switch 8 is switched. The means 9 receives the turn-off signal of the switch 8 and cuts off the current of the electromagnet 22 in the electromagnetic switch 10 which is a component of the safety device 7. Then, the pin 18 moves upward by the tensile force of the spring 20, and the connection lever 14 and the malfunction prevention means 19 are not connected.

  In FIG. 4C, when the speed governor 4 reaches the second speed, the speed governor 4 grasps the speed governor rope 3 to pull up the pulling rod 6. Then, the emergency stop lever 11 fixed to the pull-up bar 6 so as to rotate is rotated, and the connection lever 14 is moved to the left side by the rotation. At that time, the connecting lever 14 and the malfunction preventing means 19 are not connected to each other. In addition, the connection pin 14 that is no longer connected by the instruction pin 29 is instructed to move in the left-right direction without rotating.

FIG. 5 is a diagram showing the operation of the emergency stop means 7 constituting the emergency stop device for an elevator according to the first embodiment of the present invention.
Since the connecting lever 14 and the malfunction prevention means 19 are not connected to each other, when the pull-up bar 6 receives an upward force, the pull-up bar 6 moves upward, and the brake 13 is also rotated by the rotation of the emergency stop lever 11. By moving upward, the guide rail 1 and the brake 13 can slide to obtain a braking force, and an emergency stop operation is performed. At that time, even if the pull-up bar 6 receives an upward force, it is not affected by the urging force of the malfunction preventing means 19, so that an emergency stop operation can be performed without causing a delay.

  Therefore, according to the first embodiment, the car 2, the guide rail 1, the governor 4, the governor rope 3, the pulling bar 6 having one end fixed to the governor rope 3, and the lifting The emergency stop means 7 that operates based on the position of the other end of the bar 6 and slides on the guide rail 1 to obtain the braking force of the car 2, and the malfunction prevention that applies a predetermined load to operate the emergency stop means 7 Since the control means 9 is controlled based on the signal input from the switch 8 based on the signal 19 and the electromagnetic switch 10 for releasing the predetermined load applied to the malfunction prevention means 19, the malfunction prevention means 19 is provided. The operation delay of the emergency stop means 7 due to the urging force can be improved.

  In FIG. 5, when the speed of the car 2 is reduced to less than the second speed due to the emergency stop operation, the governor 4 releases the grip of the governor rope 3, so The emergency stop lever 11 rotates counterclockwise by the child 13 and stops at the position shown in FIG. Then, the center position of the hole provided in the connecting lever 14 connected to the emergency stop lever 11 and the hole provided in the malfunction prevention means 19 coincide. When the speed of the car 2 further decreases and becomes less than the first speed, the switch 8 fixed to the governor 4 outputs an input signal, and the control means 9 receiving the signal outputs a current to the electromagnetic switch 10. Since the pin 18 is applied, the connecting lever 14 and the malfunction preventing means 19 are connected. Therefore, even after an emergency stop operation, it is possible to automatically return to the normal operation state.

In the first embodiment, the pull-up bar 6 is not necessarily a bar as long as it is a means for connecting the governor rope 4 and the emergency stop lever 11, and may be implemented even if it is constituted by a string or the like. There is no problem in constructing Example 1.
Further, when the predetermined first speed is reached, the control means 9 electrically connected to the switch 8 receives the turn-off signal of the switch 8 and the current of the electromagnet 21 in the electromagnetic switch 10 which is a component of the emergency stop device 7. On the contrary, when a predetermined first speed is reached, the control means 9 that is electrically connected to the switch 8 receives the input signal of the switch 8 and is a component of the emergency stop device 7. A current may be applied to the electromagnet 22 in the electromagnetic switch 10. However, in this case, in the configuration of the electromagnetic switch 12, the spring 20 is always configured to generate a force in a direction in which the electromagnetic switch body 12 and the pin 18 are in contact with each other, and when an electric current is passed through the electromagnet 22, the electromagnetic switch body. For example, the position of the electromagnet 22 needs to be configured above the pin 18 so that the pin 12 and the pin 18 do not come into contact with each other.
Further, with respect to the first speed and the second speed, the second speed is larger than the first speed, and the first speed is larger than the rated speed. It is not necessarily 1.3 times or 1.4 times the speed.

In the second embodiment, a case where the malfunction prevention release unit has a different configuration from the first embodiment will be described. FIG. 6 is an operation diagram of the connecting lever 23 and the malfunction preventing means 19 constituting the emergency stop device for an elevator according to the second embodiment of the present invention, and a sectional view of the electromagnetic switch 24.
The parts not displayed are the same as those in the first embodiment, and in FIG. 6, the same reference numerals as those in FIG. 4 indicate the same or corresponding parts.

  In FIG. 6A, one end of the connecting lever 23 fixed to the emergency stop lever 11 is fixed to be rotatable. An L-shaped hole 23 a is formed at the other end of the connecting lever 23, and the hole 23 a is engaged with a rod-shaped stopper 25 fixed to the malfunction prevention unit 19. The connecting lever 23 is fitted by a mover 26 having two pins 26a fixed thereto. The mover 26 constitutes one part of the electromagnetic switch 24, and the other component parts of the electromagnetic switch 24, which is the malfunction prevention release means, are between the electromagnetic switch body 27, the electromagnetic switch body 27, and the mover 26. On the other hand, a spring 20 that generates a pressing force and an electromagnet 22 that is fixed to the electromagnetic switch body 27 and generates an attractive force between the movable element 26 and the electromagnetic switch body 27 are configured.

  Under normal conditions, current always flows through the electromagnet 22 fixed to the electromagnetic switch 24, so that the movable member 26 is fixed in contact with the electromagnet 22. Therefore, since the position of the rod-shaped stopper 25 fixed to the malfunction prevention unit 19 is normally located above the L-shaped hole 23a, the connecting lever 23 is less than that due to the biasing force of the malfunction prevention unit 19. You cannot move left and right with force.

  In FIG. 6B, when the speed governor 4 reaches a first speed that is a predetermined speed, the switch 8 provided in the speed governor 4 is switched, and the control is electrically connected to the switch 8. The means 9 receives the turn-off signal of the switch 8 and cuts off the current of the electromagnet 22 in the electromagnetic switch 24 which is a component of the emergency stop device 7, and the mover 26 moves upward by the tensile force of the spring 20. The connecting lever 23 fitted to the child 26 also moves upward. Then, the position of the stopper 25 with respect to the hole 23a on the L-shape of the connecting lever 23 moves downward, so that the connecting lever 23 can perform the left and right operation without depending on the urging force of the malfunction preventing portion 19. .

  In FIG. 6C, when the speed governor 4 reaches the second speed, the speed governor 4 grasps the speed governor rope 3 to pull up the pulling rod 6. Then, the emergency stop lever 11 fixed to the pull-up bar 6 so as to rotate is rotated, and the connection lever 23 is moved to the left side by the rotation. At this time, since the connecting lever 23 and the malfunction preventing portion 19 are not connected by the shape of the hole 23a of the connecting lever 23, the connection lever 23 and the malfunction preventing portion 19 are not affected by the urging force of the malfunction preventing portion 19, so that a delay occurs. Emergency stop operation can be performed. Therefore, the same effect as in the first embodiment can be obtained.

  The emergency stop device for an elevator according to the present invention is suitable for an elevator safety device.

Claims (2)

The guide rail, the governor, the governor rope, the connecting means having one end fixed to the governor rope, and the position of the other end of the connecting means. An emergency stop unit that presses against a rail to obtain braking force of the car, a malfunction prevention unit that applies a predetermined urging force to the operation of the emergency stop unit to prevent malfunction, and a predetermined speed based on the speed of the car. An emergency stop device for an elevator, comprising: a malfunction prevention canceling means for canceling the predetermined urging force given by the malfunction prevention means when the speed exceeds a predetermined speed. The malfunction prevention release means is provided in the speed governor, detects a predetermined speed and outputs a signal, and an electromagnetic switch that releases the predetermined urging force provided by the malfunction prevention means, 2. The elevator emergency stop device according to claim 1, further comprising control means for controlling a current applied to the electromagnetic switch based on a signal of the switch.

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