JP2008030933A - Safety device of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device of an elevator capable of surely providing safety, by quickly stopping operation of the elevator, when derailment occurs in a counterweight. <P>SOLUTION: This safety device has the counterweight 8 of the elevator moving along a guide rail 13, and a derailment detecting switch 18 detecting the derailment of this counterweight 8. When the derailment detecting switch 18 detects the derailment of the counterweight 8, its signal is sent to a control board 10 via a wiring cable 22 and a tail cord 11, and a safety circuit of a hoisting machine 3 being a driving device of the elevator is cut off based on this signal, and the counterweight 8 is controlled so as to stop the movement. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an elevator safety device that detects the presence or absence of an unbalanced rail of an elevator weight and stops the operation of the elevator for safety when the occurrence of the unrailed state is detected.

  A vine-type elevator has a hoisting machine as a drive unit at the top of a hoistway of a building, and a main rope is wound around the traction sheave of this hoisting machine, and a car is installed at one end of the main rope. A counterweight is supported on the end side, and the car and the counterweight are suspended in the hoistway via the main rope. Then, the hoisting machine is activated and the traction sheave rotates, so that the main rope travels, and the car and the counterweight move up and down in opposite directions while being guided along the guide rails.

  By the way, it is assumed that when the abnormal vibration occurs due to an earthquake or the like, a derailing occurs in which the counterweight is separated from the guide rail. When the rail is removed, there is a risk that the movement track of the counterweight shifts and the counterweight collides with the car and the surrounding equipment.

For this reason, the elevator is generally provided with a detection device for detecting the balance rail derailment as disclosed in, for example, Japanese Patent Application Laid-Open No. 11-79588.
JP 11-79588 A

  However, the conventional derailing detection device detects the derailment when a derailment occurs in the counterweight, and sends the detection signal to the elevator machine room to display the occurrence of the derailment on the display in the machine room. Just do it. The maintenance staff views the display and copes with the rail removal.

  However, if a rail break occurs during the operation of the elevator, there is a risk that the balance weight that has been released may collide with the car or peripheral equipment. That's not enough.

  The present invention has been made paying attention to such points, and the object of the present invention is to promptly stop the operation of the elevator and ensure safety when the rail is released from the counterweight. It is to provide a safety device for an elevator.

  According to the first aspect of the present invention, there is provided a balance weight of an elevator moving along a guide rail, a release rail detection means for detecting the release rail of the balance weight, and a lift rail when the release rail detection means detects a release rail. And a control means for controlling the driving device to stop the movement of the counterweight.

  According to a second aspect of the present invention, the counterweight includes a guide device that slidably engages with the guide rail to guide the counterweight, and the guide device is provided with the derailing detection means. It is a feature.

  According to the present invention, when the derailment occurs in the counterweight, it is possible to stop the operation of the elevator quickly and to ensure safety.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows the overall configuration of an elevator. A machine room 2 is provided in the upper part of a hoistway 1 of a building, and a hoisting machine 3 as a drive device is installed in the machine room 2. . The hoisting machine 3 includes a traction sheave 4, and a main rope 6 is wound around the traction sheave 4. Both ends of the main rope 6 are pulled down into the hoistway 1, a car 7 is connected to one end of the main rope 6, and a counterweight 8 is connected to the terminal on the other end, and the car 7 and the counterweight 8 are moved up and down. It is suspended in the road 1.

  The machine room 2 is provided with a control panel 10 as a control means for controlling the elevator. The control panel 10 and the car 7 are connected by a tail cord 11, and the car 7 is fed via the tail cord 11. Control signals are exchanged. A safety circuit is connected to the hoisting machine 3, and the driving of the hoisting machine 3 is controlled by the control panel 10 through the safety circuit. Then, the hoisting machine 3 is activated, the traction sheave 4 rotates and the main rope 6 travels, whereby the car 7 and the balance weight 8 are moved up and down in directions opposite to each other in the hoistway 1.

In the hoistway 1, a pair of balance weight guide rails 13 are provided in parallel so as to stand vertically and a balance weight 8 is arranged between the pair of guide rails 13. Guide devices 14 are provided on both the upper and lower sides of the counterweight 8. The guide devices 14 are slidably engaged with the guide rails 13, and the counterweight 8 is along the guide rails 13 via the guide devices 14. To be moved.
Although not shown, a guide rail for guiding and a guide device that engages with the guide rail are also provided for the car 7, and the guide device is arranged so that the movement of the car 7 moves along the guide rail. Is guided through.

  FIG. 2 shows the structure of the guide device 14 provided on the counterweight. The guide device 14 includes a base 15 attached to the counterweight 8, and a guide shoe 16 having a U-shaped cross section is provided on the base 15. The guide shoe 16 is slidable on the guide rail 13. The counterweight is engaged, and the counterweight 8 is guided to move along the guide rail 13 by this engagement.

  A mounting angle 17 is provided on the base 15, and a detection switch 18 as a rail removal detecting means is mounted on the mounting angle 17. The detection switch 18 has a contact (not shown) that contacts the guide rail 13, and when the counterweight is removed, the contact between the contact and the guide rail 13 is released to detect the removal of the rail. It has become.

  As shown in FIG. 1, the guide devices 14 are provided on both upper and lower sides of the counterweight 8, and each of the guide devices 14 is provided with a detection switch 18 for detecting a rail release. Guide devices 14 provided on both sides of the lower end of the counterweight 8 are attached to the counterweight 8 with the guide device 14 shown in FIG.

  The counterweight 8 and the car 7 are connected by a wiring cable 22 as shown in FIG. The signals of the detection switches 18 are sent to the car 7 through the wiring cable 22, and further, the signals are sent to the control panel 10 through the tail cord 11.

  Next, the operation of this embodiment will be described.

  When the balance weight 8 is released from the guide rail 13 due to abnormal vibration such as an earthquake during normal operation, the release rail is detected by the detection switch 18 and the signal is transmitted through the wiring cable 22 and the tail cord 11 to the control panel 10. Sent to. Based on the input of this signal, the safety circuit for driving the hoisting machine 3 is cut off under the control of the control panel 10, whereby the movement of the car 7 and the counterweight 8 is stopped.

  As described above, when the rail is removed during the operation of the elevator, the movement of the car 7 and the counterweight 8 is quickly stopped. It is possible to prevent the danger of colliding with other devices.

  When the detection switch 18 detects a derailment, the hoisting machine 3 is driven until the car 7 reaches the nearest floor, and then the safety circuit is cut off to move the car 7 and the counterweight 8. It may be a case where control is performed so as to stop.

  The detection switch 18 for detecting the derailment is not limited to the contact type, and a detection switch such as a photoelectric type, a magnetic type, or a proximity type can also be used. The detection switches 18 are provided at four locations on both the upper and lower sides of the counterweight 8, two on both the upper and lower sides, and two on both sides of the intermediate portion in the vertical direction of the counterweight 8. It may be a case where it is provided at a location.

BRIEF DESCRIPTION OF THE DRAWINGS The whole elevator block diagram which shows one Embodiment of this invention. The perspective view which shows the guide apparatus provided in the counterweight of the elevator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hoistway 2 ... Machine room 3 ... Hoisting machine 4 ... Traction sheave 6 ... Main rope 7 ... Car 8 ... Balance weight 10 ... Control panel 11 ... Tail cord 13 ... Guide rail 14 ... Guide device 15 ... Base 16 ... Guide shoe 17 ... Mounting angle 18 ... Detection switch 22 ... Wiring cable

Claims (2)

The balance weight of the elevator moving along the guide rail,
Derailing detection means for detecting the derailment of this counterweight,
Control means for controlling the elevator drive device when the rail release detecting means detects the rail release to stop the movement of the counterweight;
An elevator safety device comprising:   The balance weight includes a guide device that slidably engages with the guide rail to guide the balance weight, and the guide device is provided with the rail removal detecting means. The elevator safety device described.

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