JP2015081193A - Elevator safety device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator safety device that allows a worker at the bottom of a hoistway to be surely aware of approach of a car or a balancing weight and allows accuracy to be required for a proximity sensor for detecting approach of the car or the balancing weight to be reduced.SOLUTION: There is provided the elevator safety device that secures safety of a worker at a bottom 7 of a hoistway 5 in an elevator: having a car 1 and a balancing weight 2 which are connected by a main rope 3 and move up and down in the hoistway 5; and guide rails 6a, 6b for guiding the car 1 and the balancing weight 2. The elevator safety device includes: a plurality of suspension bodies 8 that are attached to the balancing weight 2 and hanged from the balancing weight 2 toward the bottom 7 of the hoistway 5; a proximity sensor 9 that is disposed at the guide rail 6a and detects that a suspension body 8a close to the guide rail 6a among the plurality of suspension bodies 8 has approached; and an alarm device 10 that issues an alarm according to detection of the suspension body 8a by the proximity sensor 9.

Description

  The present invention relates to an elevator safety device that ensures the safety of an operator at the bottom of an elevator hoistway.

  In general, an elevator has a structure in which a passenger car and a counterweight are connected to each other by a main rope, and both of the elevators are lifted and lowered in a hoistway. In such an elevator, there is a concern that an operator working at the bottom of the hoistway may come into contact with a car or a counterweight that has been lowered for some reason.

  For this reason, conventionally, in Patent Document 1, a suspension body is suspended from a carriage and a counterweight, and the suspension body touches the operator so that the operator can have a cage or a counterweight. A configuration has been proposed in which the operator is aware of the approach and avoids the operator from touching the car or the counterweight.

  Conventionally, in Patent Document 2, a proximity sensor is provided on a guide rail that guides the raising and lowering of the car and the counterweight, and the buzzer is sounded when the proximity sensor detects that the car or the counterweight has approached, A configuration has been proposed in which an operator is made aware that the car or the counterweight is approaching and prevents the operator from touching the car or the counterweight.

JP 2003-112865 A Japanese Patent Laid-Open No. 04-266374

  However, in the prior art disclosed in Patent Document 1, even if the suspended body touches the worker, the worker may not notice, and the concern that the worker may contact the car or the counterweight cannot be resolved. . In the prior art disclosed in Patent Document 2, it is necessary to provide a high-precision proximity switch in order to detect a car or a counterweight approaching from a long distance. For this reason, there has been a problem that the cost of the apparatus becomes high.

  The present invention has been made from the situation in the prior art described above, and its purpose is to make sure that the operator at the bottom of the hoistway is approaching the passenger car or the counterweight. It is an object of the present invention to provide an elevator safety device that can reduce the accuracy required for a proximity sensor that detects the approach of a car or a counterweight.

  In order to achieve the above object, an elevator safety device according to the present invention is connected by a main rope, and guides a car and a counterweight that lifts and lowers in a hoistway like a fishing bottle, and the car and the counterweight. In an elevator having a guide rail, the elevator safety device for ensuring safety of an operator at the bottom of the hoistway is attached to at least one of the car and the counterweight, and is directed toward the hoistway bottom. A plurality of suspended bodies suspended, a proximity sensor provided on the guide rail and detecting that a suspended body close to the guide rail among the plurality of suspended bodies has approached, and the proximity sensor And a warning device that issues a warning in response to the detection of the suspended body.

  According to the elevator safety device of the present invention, the alarm device issues an alarm when the proximity sensor detects a suspended body attached to the passenger car or the counterweight due to the descent of the passenger car or the counterweight. Further, when any of the suspended bodies attached to the car or the counterweight comes into contact with the operator, it is noticed that the car or the counterweight is approaching the operator. By these, this invention can make the operator of a hoistway bottom know that a car or a counterweight is approaching, and can improve the safety | security with respect to the operator of a hoistway bottom more than before. it can.

  Further, the proximity sensor provided in the present invention may be any sensor that can detect a suspended body that is close to the guide rail among a plurality of suspended bodies attached to the car or the counterweight, and the detection distance may be short. . Accordingly, the present invention can reduce the accuracy required for the proximity sensor that detects the approach of the car or the counterweight, and can reduce the cost of the apparatus.

It is a longitudinal cross-sectional view of the hoistway of the elevator in which one Embodiment of the safety device which concerns on this invention is installed. It is a cross-sectional view of an elevator hoistway in which a safety device according to this embodiment is installed. It is an enlarged view of the safety device installation part A shown in FIG. It is a principal part enlarged view of FIG. It is a perspective view which shows the proximity sensor and alarm device with which the safety device which concerns on this embodiment before the attachment to a guide rail is equipped.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an elevator safety device according to the present invention will be described with reference to the drawings.

  In the elevator in which the safety device according to the present embodiment is installed, as shown in FIG. 1, a car 1 and a counterweight 2 are connected via a main rope 3, and the sheave in the hoist 4 is rotated. Thus, the car 1 and the counterweight 2 are configured to move up and down in the hoistway 5 like a fishing bottle. The car 1 and the counterweight 2 are elevated by being guided by guide rails 6 a and 6 b erected in the hoistway 5.

  In general, it is necessary for an operator to enter the bottom portion 7 of the hoistway 5 and perform work in elevator installation work or maintenance work. In this case, if the work is performed in accordance with a predetermined work procedure, the car 1 and the counterweight 2 that descend to the bottom 7 of the hoistway 5 will not come into contact with the operator, but if any reason arises. There is a concern that the car 1 or the counterweight 2 may come into contact with the worker. Here, when considering which of the car 1 and the counterweight 2 is likely to come into contact with the operator, the counterweight 2 is lowered to a lower position of the bottom 7 of the hoistway 5 than the car 1. In addition, since the counterweight 2 operates in the opposite direction to the operation of the elevator car 1 which is the main object of elevator operation management, the operation management is difficult, so the counterweight 2 may come into contact with the operator. Is expensive.

  Thus, for example, in the present embodiment, the safety device according to the present embodiment is installed on the counterweight 2 side, which is considered to have a higher possibility of contact than the car 1, that is, in the safety device installation portion A shown in FIG. It is.

  The safety device according to the present embodiment includes a plurality of suspensions attached to at least one of the passenger car 1 and the counterweight 2, in this case, the counterweight 2, and suspended toward the bottom 7 of the hoistway 5. A proximity sensor 9 provided on a guide rail 6a that guides the body 8 and the counterweight 2, and detects that a suspended body 8a adjacent to the guide rail 6a of the plurality of suspended bodies 8 has approached, and a proximity sensor 9 is provided with an alarm device 10 that issues an alarm in response to detection of the suspended body 8a.

  As shown in FIGS. 2 and 3, the proximity sensor 9 is fixed to the proximity sensor mounting bracket 12, and the proximity sensor mounting bracket 12 is attached to the guide rail 6 a by a rail clip 13. The proximity sensor 9 is disposed on the guide rail 6a portion of the pair of guide rails 6a that is away from the car 1 so that the proximity sensor 9 does not interfere with the car 1.

  The proximity sensor 9 has a timer function for holding the detection state for several seconds once the suspension body 8a is detected. The suspension body 8a is shaken by the operation of the counterweight 2 and temporarily closes the proximity sensor 9. Even if out of the detection range, the detection state can be continued within the holding time of the timer.

  The width dimension of the part facing the proximity sensor 9 of the suspension body 8a adjacent to the guide rail 6a among the plurality of suspension bodies 8 is set larger than the width dimension of the corresponding part of the other suspension bodies 8. It is. Thereby, the detection range of the proximity sensor 9 with respect to the suspension body 8a close to the guide rail 6a can be ensured widely.

  As shown in FIG. 4, the alarm device 10 is fixed to the alarm device mounting bracket 14 attached to the portion of the guide rail 6 a located below the proximity sensor mounting bracket 12.

  The attachment position of the proximity sensor 9 is set to a position slightly higher than the height of the worker standing at the bottom 7 of the hoistway 5 before the suspension body 8 attached to the counterweight 2 contacts the worker. In addition, the proximity sensor 9 detects the suspended body 8 and an alarm is issued from the alarm device 10.

  In the safety device according to this embodiment, the proximity switch 9 and the alarm device 10 are connected by a cable 19 as shown in FIG. A detection signal from the proximity sensor 9 is output to the alarm device 10 via the cable 19, and an alarm is issued from the alarm device 10 almost simultaneously with the detection. The plug of the power line 21 is connected to an outlet 20 arranged at the bottom 7 of the hoistway 5 shown in FIG. The outlet 20 is connected to a power source.

  As shown in FIG. 5, the alarm device 10 includes a rotating lamp unit 15 arranged at the upper part and a buzzer 16 arranged at the lower part. A pi rack 17 is fixed to the alarm device mounting bracket 14, and the pi rack 17 is fixed to the guide rail 6 a as shown in FIG. 4 by reciprocating the screw 18.

  As shown in FIG. 1, a stop switch 11 for stopping the car 1 and the counterweight 2 is provided at the bottom 7 of the hoistway 5.

  According to the present embodiment configured as described above, when the proximity sensor 9 detects the suspended body 8a attached to the counterweight 2 due to the lowering of the counterweight 2, an alarm is issued from the alarm device 10. Further, when any of the plurality of suspended bodies 8 attached to the counterweight 2 comes into contact with the operator, it is noticed that the counterweight 2 is approaching the operator. The operator who notices the approach of the counterweight 2 immediately takes the avoidance posture and operates the stop switch 11 provided at the bottom 7 of the hoistway 5. Thereby, the counterweight 2 can be stopped.

  As described above, this embodiment can surely make the operator of the bottom portion 7 of the hoistway 5 aware that the counterweight 2 is approaching, and provides safety for the operator of the bottom portion 7 of the hoistway 5. Can be improved.

  In addition, the proximity sensor 9 provided in the present embodiment may be any sensor that detects the suspended body 8a close to the guide rail 6a among the plurality of suspended bodies 8 attached to the counterweight 2, and has a detection distance. It's short. In accordance with this, the present embodiment can reduce the accuracy required for the proximity sensor 9 that detects the approach of the counterweight 2, and can reduce the cost of the apparatus.

  In the above-described embodiment, when the counterweight 2 approaches the operator at the bottom 7 of the hoistway 5 and an alarm is issued from the alarm device 10, or the suspended body 8 contacts the operator. In this case, the operator operates the stop switch 11 to stop the counterweight 2, but the present invention is not limited to this. For example, a configuration may be provided in which a control device that performs control to stop the counterweight 2 according to the detection of the suspended body 8a by the proximity sensor 9 may be provided. This control device may also serve as a control device that controls the traveling of the car 1. In this case, the detection signal of the proximity sensor 9 may be transmitted to the control device via the signal line for stop control, and the operation signal of the alarm device 10 may be transmitted to the control device via the signal line for stop. You may make it control.

  In the embodiment described above, the suspension body 8 is attached to the counterweight 2, and the proximity sensor 9 and the alarm device 10 are attached to the guide rail 6a. The present invention is configured in this way. It is not limited to doing. As shown by the safety device installation portion B in FIG. 2 without attaching the suspension body 8 to the counterweight 2, the suspension body 8 is attached to the car 1, and the proximity sensor 9 and the alarm device 10 are attached to the guide rail 6b. Alternatively, the suspension body 8 may be attached to both the counterweight 2 and the car 1.

DESCRIPTION OF SYMBOLS 1 Car 2 Balance weight 3 Main rope 5 Hoistway 6a Guide rail 6b Guide rail 7 Bottom part 8 Suspension body 8a Suspension body 9 Proximity sensor 10 Alarm device 11 Stop switch 12 Proximity sensor attachment bracket 14 Alarm device attachment bracket 19 Cable

Claims (4)

An elevator that is connected by a main rope and has a cage and a counterweight that moves up and down in a hoistway like a fishing bottle, and a guide rail that guides the passenger car and the counterweight, and is safe for the operator at the bottom of the hoistway In the elevator safety device to ensure
A plurality of suspended bodies attached to at least one of the car and the counterweight and suspended toward the bottom of the hoistway;
A proximity sensor that is provided on the guide rail and detects that a suspended body close to the guide rail among the suspended bodies is approached;
An elevator safety device comprising: an alarm device that issues an alarm in response to detection of the suspended body by the proximity sensor. In the elevator safety device according to claim 1,
The width dimension of the part facing the proximity sensor of the suspension body close to the guide rail among the plurality of suspension bodies is set larger than the width dimension of the corresponding part of the other suspension body. Elevator safety device characterized. In the elevator safety device according to claim 2,
Fixing the proximity sensor to a proximity sensor mounting bracket attached to the guide rail;
The elevator safety device, wherein the alarm device is fixed to an alarm device mounting bracket attached to a portion of the guide rail located below the proximity sensor mounting bracket. In the elevator safety device according to any one of claims 1 to 3,
An elevator safety device comprising: a control device that performs control to stop the car and the counterweight in response to detection of the suspended body by the proximity sensor.