JP2010254386A - Safety device for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device for an elevator, dispensing with an emergency stop device and a mechanical speed regulator, and reducing power consumption and a hoistway space by reducing the weight of a car. <P>SOLUTION: The safety device of the elevator includes: a plurality of hoisting ropes; a car speed detecting device for detecting the actual lifting speed of the car; a first brake device for mechanically braking the rotation of a sheave; a second brake device for mechanically braking the lifting and lowering of the hoisting rope; a first safety device for operating the first brake device and stopping the car when an output of the car speed detecting device exceeds a first prescribed value; a second safety device for operating the second brake device and stopping the car when the output of the car speed detecting device exceeds a second prescribed value; and a rope fracture detecting device for detecting the fracture of the individual rope, and operating the first and the second brake devices and stopping the car when a fracture of the individual rope is detected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an elevator safety device.

  Conventionally, an elevator safety device is provided with an emergency stop device and a mechanical speed governor for emergency stop of a car according to an elevator regulation in case the car falls due to a rope breakage or the like. However, since the safety factor of the rope is actually high, it can be said that the car will not drop due to the rope breakage, etc.The emergency stop device and mechanical governor installed in the elevator are The fact was that the mission was completed without ever being used.

  Moreover, as a prior art, an emergency brake device for an elevator that includes a shoe that is actuated by a spring and applies a braking force to the hoisting rope of the elevator has been proposed (for example, see Patent Document 1).

Japanese Patent No. 3532200

  Conventional elevator safety devices are always equipped with emergency stop devices and mechanical governors that will never be used, but this increases the weight of the car and increases power consumption. There is a problem that the road space becomes large. In the prior art described in Patent Document 1, an emergency brake device for an elevator that includes a shoe that is actuated by a spring and applies a braking force to the hoisting rope of the elevator is proposed. There is no mention of the need for a type governor.

  If the hoisting rope of the elevator is replaced when the hoisting rope is replaced by monitoring the breaking condition of the wire and detecting the deterioration, the elevator hoisting rope usually does not break. Further, in the elevator, even if one of the plurality of hoisting ropes breaks, the car does not fall. Therefore, if it is possible to detect the breakage of one hoisting rope and stop the car, it is considered that the safety of the elevator can be ensured without the emergency stop device and the mechanical governor.

  The present invention has been made to solve the above-described problems, does not require an emergency stop device and a mechanical governor, and reduces power consumption and hoistway space by reducing the weight of the car. Thus, an elevator safety device with improved safety is provided.

  In the elevator safety device according to the present invention, the elevator car, the counterweight, the hoisting machine composed of the hoisting motor and the sheave, and the sheave of the hoisting machine are wound around both ends. The hoisting weight of the hoisting machine is suspended and the hoisting rope of the hoisting machine rotates to raise and lower the car and the hoisting weight in opposite directions. A car speed detecting device for detecting the hoisting machine, a first brake device provided on the hoisting machine for mechanically restraining the rotation of the sheave, and a second for mechanically restraining the raising and lowering of the hoisting rope composed of a plurality of sheaves. The first safety device that operates the first brake device to stop the car when the output of the car speed detecting device exceeds the first predetermined value, and the output of the car speed detecting device is the first Exceeds the predetermined value of 2 Operating the second brake device and a second safety device for stopping the car when the is obtained by eliminating the emergency stop device with mechanical governor.

  In addition, when the individual rope breakage of a plurality of hoisting ropes is detected and the individual rope breakage is detected, the rope breakage detection is performed to stop the car by operating the first brake device and the second brake device. The apparatus is further provided with an emergency stop device and a mechanical speed governor.

  In addition, when the operation status of the first safety device and the second safety device is confirmed and an abnormal operation of the first safety device and the second safety device is confirmed, the first brake device and the second brake device are operated. And an operation confirmation device for stopping the car.

  Further, when the car is stopped by operating the first brake device and the second brake device, the vehicle cannot be restarted thereafter.

  Further, the rope breakage detection device detects individual rope breakage of the hoisting rope when a series of electric wires stretched between the individual ropes is disconnected.

  The operation check device compares the output of the rotary encoder attached to the hoisting motor and the output of the rotary encoder attached to the roller rotating in contact with the guide rail, and the first safety device and the second safety device. An abnormal operation is confirmed by executing an operation confirmation program when the safety device is stopped.

  According to the present invention, a plurality of hoisting ropes, a car speed detecting device that detects the actual lifting speed of the car, the first brake device that mechanically stops the rotation of the sheave, and the hoisting rope. And a first safety device that operates the first brake device to stop the car when the output of the car speed detection device exceeds a first predetermined value. And a second safety device that operates the second brake device to stop the car when the output of the car speed detecting device exceeds a second predetermined value, or a plurality of hoisting ropes Conventionally required depending on whether a rope breakage detecting device is further provided to detect the individual rope breakage and to operate the first brake device and the second brake device to stop the car when the individual rope breakage is detected. Emergency stop It can be eliminated and a device and a mechanical governor, there is an effect that it is possible to reduction of reducing the hoistway space in power consumption due to weight reduction of the car.

1 is an overall configuration diagram showing an elevator safety device according to Embodiment 1 of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS It is a system block diagram which shows the principal part of the safety device of the elevator in Example 1 of this invention. It is a perspective view which shows the rope breakage detection apparatus which detects each rope breakage of the hoisting rope in Example 1 of this invention. FIG. 4 is a view corresponding to FIG. 3 showing a state at the time of detecting a rope break.

  In FIG. 1, 1 is an elevator car, 2 is a counterweight, 3 is a hoisting motor, 4 is a sheave connected to the hoisting motor 3, and 5 is provided in the hoisting machine, and the sheave 4 is rotated. A first braking device that stops when the actual lifting speed of the car 1 exceeds a first predetermined value, shuts off the power of the hoisting motor 3 and mechanically rotates the sheave 4 The car is stopped and the car 1 is stopped. Reference numeral 6 denotes a plurality of hoisting ropes wound around the sheave 4, and a car 1 and a counterweight 2 are suspended from both ends thereof. 7 is a car speed detecting device provided on the car 1 for detecting the actual lifting speed of the car 1, and 8 is a second brake device for mechanically restraining the lifting and lowering of a plurality of hoisting ropes 6. The car 1 is actuated when the actual lifting speed of the car 1 exceeds a second predetermined value to mechanically stop a plurality of hoisting ropes 6 and stop the car 1. It should be noted that the actual lifting speed of the car 1, that is, the output of the car speed detecting device 7, is the first predetermined value <the second predetermined value. A first safety device 10 is provided in the car 1 and operates the first brake device 5 to stop the car 1 when the output of the car speed detection device 7 exceeds a first predetermined value. A second safety device 11 is provided in the car 1 and operates the second brake device 8 to stop the car 1 when the output of the car speed detecting device 7 exceeds a second predetermined value. In the operation confirmation device for confirming the operation status of the safety device 9 and the second safety device 10, when the operation abnormality of the first safety device 9 and the second safety device 10 is confirmed, the first brake device 5 And the 2nd brake device 8 is operated, the car 1 is stopped, and it cannot be restarted after that. Reference numeral 12 denotes a rope breakage detecting device for detecting individual rope breaks of a plurality of hoisting ropes 6. When each rope breakage is detected, the first brake device 5 and the second brake device 8 are operated. Stop the car 1 and make it impossible to restart.

FIG. 2 is a system configuration diagram showing a main part of an elevator safety device.
The car speed detecting device 7 is composed of a roller 14 that contacts the guide rail 13 and rotates in accordance with the raising and lowering of the car 1, a rotary encoder 15 connected to the roller 14, and an F / V converter 16. The F / V converter 16 outputs a real car speed signal VSC. A speed detector comprising a rotary encoder 17 attached to the hoisting motor 3 and an F / V converter 18 outputs a speed signal VST. Here, VST = VSC when the car is stopped and at the rated speed. Further, the first safety device 9 that operates the first brake device 5 to stop the car 1 when the output VSC of the car speed detecting device 7 exceeds the first predetermined value V1c is provided with a first comparator 19. And a first switching element 20 and a first output relay 21. Further, the second safety device 10 that operates the second brake device 8 to stop the car 1 when the output VSC of the car speed detecting device 7 exceeds the second predetermined value V2c is the second comparator 22. And a second switching element 23 and a second output relay 24. The operation confirmation device 11 for confirming the operation status of the first safety device 9 and the second safety device 10 confirms that VST = VSC when the car is stopped and at the rated speed, and confirms the operation when the vehicle is stopped. By executing the program, the operation abnormality of the first safety device 9 and the second safety device 10 is confirmed. The operation check program at the time of stop confirms V1i = 0 → V10 = 0, V1i = V1c → V10 = E in the first safety device 9, and V2i = 0 → V20 = 0 in the second safety device 10. By confirming V2i = V2c → V20 = E, it is confirmed that the safety devices 9 and 10 operate reliably.

3 and 4 are perspective views showing a rope breakage detecting device for detecting individual rope breakage of the hoisting rope.
6a is an individual rope of the hoisting rope 6 composed of a plurality of pieces. A rope socket 25 is provided at the lower end of each rope 6 a and is attached to the car frame 1 a of the car 1 via a spring 26. A series of electric wires 27 are stretched between the individual ropes 6a, and the electric wires 27 are connected to an output relay 28 for detecting breakage. Therefore, when one of the individual ropes 6a of the plurality of hoisting ropes 6 breaks, as shown in FIG. 4, the spring 26 of the broken rope 6a is extended, and the electric wire 27 is disconnected, thereby detecting the breakage. The output relay 28 can drop out and detect individual rope breaks. Then, the first brake device 5 and the second brake device 8 are actuated to stop the car 1 and thereafter cannot be restarted.
In the first embodiment, the rope breakage detection device 12 is provided. However, since the rope breakage does not normally occur, the safety can be normally secured without the rope breakage detection device 12, and may be unnecessary.

DESCRIPTION OF SYMBOLS 1 Elevator car 1a Car frame 2 Balance weight 3 Hoisting motor 4 Sheave 5 First brake device 6 Hoisting rope 6a Individual rope 7 Car speed detecting device 8 Second brake device 9 First safety device 10 Second safety device 11 Operation confirmation device 12 Rope break detection device 13 Guide rail 14 Roller 15, 17 Rotary encoder 16, 18 F / V converter 19, 22 Comparator 20, 23 Switching element 21, 24 Output relay 25 Rope socket 26 Spring 27 Electric wire 28 Output relay for detecting breakage

Claims (6)

Elevator car,
Counterweight and
A hoisting machine comprising a hoisting motor and a sheave;
A plurality of hoists that are wound around the sheaves of the hoisting machine, the car and the counterweights are suspended at both ends, and the car and the counterweights are raised and lowered in opposite directions by rotation of the sheaves of the hoisting machine. A hoisting rope made of books,
A car speed detecting device that is provided in the car and detects the actual lifting speed of the car;
A first brake device provided in the hoisting machine for mechanically stopping rotation of the sheave;
A second brake device for mechanically restraining the lifting and lowering of the plurality of hoisting ropes;
A first safety device that activates the first brake device to stop the car when the output of the car speed detection device exceeds a first predetermined value;
A second safety device that operates the second brake device to stop the car when the output of the car speed detection device exceeds a second predetermined value;
An elevator safety device characterized by eliminating an emergency stop device and a mechanical governor. Elevator car,
Counterweight and
A hoisting machine comprising a hoisting motor and a sheave;
A plurality of hoists that are wound around the sheaves of the hoisting machine, the car and the counterweights are suspended at both ends, and the car and the counterweights are raised and lowered in opposite directions by rotation of the sheaves of the hoisting machine. A hoisting rope made of books,
A car speed detecting device that is provided in the car and detects the actual lifting speed of the car;
A first brake device provided in the hoisting machine for mechanically stopping rotation of the sheave;
A second brake device for mechanically restraining the lifting and lowering of the plurality of hoisting ropes;
A first safety device that activates the first brake device to stop the car when the output of the car speed detection device exceeds a first predetermined value;
A second safety device that activates the second brake device to stop the car when the output of the car speed detection device exceeds a second predetermined value;
Rope rupture detection for detecting individual rope breaks of the plurality of hoisting ropes and operating the first brake device and the second brake device to stop the car when the individual rope breaks are detected. With the device,
An elevator safety device characterized by eliminating an emergency stop device and a mechanical governor. Elevator car,
Counterweight and
A hoisting machine comprising a hoisting motor and a sheave;
A plurality of hoists that are wound around the sheaves of the hoisting machine, the car and the counterweights are suspended at both ends, and the car and the counterweights are raised and lowered in opposite directions by rotation of the sheaves of the hoisting machine. A hoisting rope made of books,
A car speed detecting device that is provided in the car and detects the actual lifting speed of the car;
A first brake device provided in the hoisting machine for mechanically stopping rotation of the sheave;
A second brake device for mechanically restraining the lifting and lowering of the plurality of hoisting ropes;
A first safety device that activates the first brake device to stop the car when the output of the car speed detection device exceeds a first predetermined value;
A second safety device that activates the second brake device to stop the car when the output of the car speed detection device exceeds a second predetermined value;
Rope rupture detection for detecting individual rope breaks of the plurality of hoisting ropes and operating the first brake device and the second brake device to stop the car when the individual rope breaks are detected. Equipment,
When the operation status of the first safety device and the second safety device is confirmed and an abnormal operation of the first safety device and the second safety device is confirmed, the first brake device and the second brake device are An operation check device that operates to stop the car,
An elevator safety device characterized by eliminating an emergency stop device and a mechanical governor.   The elevator safety according to any one of claims 1 to 3, wherein when the car is stopped by operating the first brake device and the second brake device, the vehicle cannot be restarted thereafter. apparatus.   The rope breakage detecting device detects an individual rope breakage of a hoisting rope by disconnecting a series of electric wires stretched between the individual ropes. Safety device.   The operation check device compares the output of the rotary encoder attached to the hoisting motor and the output of the rotary encoder attached to the roller rotating in contact with the guide rail, and the first safety device and the second safety device. 4. The elevator safety device according to claim 3, wherein an abnormal operation is confirmed by executing an operation confirmation program at the time of stopping.

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