JP2011230920A - Elevator inspection work safety device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure an operator who stops an elevator car if moved in unexpected manner and performs maintenance inside a pit section on a hoistway.SOLUTION: The elevator inspection work safety device includes the car 2 that is disposed inside the hoistway 1 of the elevator and moves up and down, and a safety sensor 23 that may sense the movement of the car 2 if the car lowers to a pit section 1a and a control panel that has the function of operating the brake mechanism of a hoisting machine for driving the car 2 in response to the sensing with the safety sensor 23 before the operator who enters the lowermost pit section 1a on the hoistway 1 to perform maintenance goes out of the pit section 1a. The brake mechanism of the hoisting machine is operated with a signal of the safety sensor 23 to perform an emergency stop of the car 2 and secure the operator if the car 2 lowers to the pit section 1a to actuate the safety sensor 23 before the operator goes out of the pit section 1a.

Description

  Embodiments of the present invention relate to a safety device for ensuring the safety of an operator during maintenance inspection in a pit portion of an elevator hoistway.

  In the vine-type elevator, a car is suspended in a hoistway of a building, and the car is driven by a hoisting machine to move up and down in the hoistway. The hoisting machine is installed in a machine room above the hoistway, for example. Further, a control panel for controlling the hoisting machine is installed in the machine room.

During normal operation, the hoisting machine is driven by the control of the control panel based on signals corresponding to the car call registration and destination floor registration operations by the elevator user, and the car moves up and down in the hoistway by that drive. When the vehicle reaches the target floor, the brake mechanism of the hoisting machine operates under the control of the control panel, and the movement of the car is restricted and stopped by the operation of the brake mechanism.
The lowermost part of the hoistway is a pit part that falls below the floor of the elevator hall on the lowest floor of the building, and devices such as buffers are installed on the floor part of this pit part.
One of the maintenance inspection work for such an elevator is work in the pit section. When working in the pit part, the worker manually opens the door device of the elevator hall on the lowest floor and enters the pit part. A safety circuit switch is provided near the entrance to the pit portion to prevent the car from inadvertently moving during maintenance inspection work. When the worker enters the pit section, the safety circuit switch is operated to open the circuit to ensure safety. When the work is completed, an operator comes out of the pit portion, and the safety circuit switch is operated again to close the circuit, thereby enabling normal operation of the elevator.

JP-A-4-266374

  As described above, when starting maintenance work in the pit section, the safety circuit switch is operated to ensure safety. However, it is not without inadvertently neglecting or forgetting the operation.

  If you work in the pit section without neglecting or forgetting to operate the safety circuit switch, the car may be operated by another elevator maintenance worker, etc., and the car may descend into the pit section, causing unexpected danger. is there.

  In particular, when the work in the pit section is completed and the worker is about to leave the pit section, the car is already operated by another maintenance worker, thinking that the worker has already left the pit section, and the pit There is a risk that a worker may be caught in the descending car near the entrance of the section.

  In order to solve such problems, the invention of claim 1 is arranged in the elevator pit and moves up and down, and enters the lowermost pit portion of the hoistway to perform maintenance work. A safety sensor capable of detecting the operation of the car when it is lowered to the pit before the worker performing the work exits the pit, and the car according to the detection by the safety sensor And a restricting means for restricting movement of the head.

  The invention according to claim 2 is characterized in that the safety sensor is disposed at a lower end portion of a support frame provided in a lower portion on the front side of the car so as to protrude downward.

  The invention according to claim 3 is characterized in that the safety sensor is disposed at a lower end portion of an apron provided in a lower portion on the front side of the car so as to protrude downward.

  The invention of claim 4 is characterized in that the safety sensor is disposed on an inner wall surface of the pit portion.

  According to a fifth aspect of the present invention, there is provided an emergency stop means capable of emergency stopping the movement of the car, arranged in the elevator hoistway and moving up and down, and a pit portion at the bottom of the hoistway, , A pit ladder provided in the pit portion and used for a maintenance inspection worker to enter and exit the pit portion, and a load applied when the worker gets on the pit ladder and gets on the pit ladder, And a safety sensor that operates the emergency stop means in response to the detection.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the whole structure of the elevator which concerns on 1st Embodiment of this invention. The front view which shows the structure of the lower part of the elevator car. The side view which shows the structure of the lower part of the elevator car. The front view which shows the structure of the lower part of the elevator car which concerns on 2nd Embodiment of this invention. The side view which shows the structure of the lower part of the elevator car which concerns on 2nd Embodiment of this invention. The front view which shows the structure of the lower part of the elevator car which concerns on 3rd Embodiment of this invention. The side view which shows the structure of the lower part of the elevator car which concerns on 3rd Embodiment of this invention. The front view which shows the structure of the lower part of the elevator car which concerns on 4th Embodiment of this invention. The front view which shows the structure of the lower part of the elevator car which concerns on 4th Embodiment of this invention. The front view of the pit ladder which shows 5th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show a first embodiment. As shown in FIG. 1, a hoistway 1 is provided in the building, and a car 2 is suspended in the hoistway 1 via a rope 3. The rope 3 is wound around, for example, a hoisting machine as driving means provided in a machine room above the hoistway 1.

  The machine room is provided with a control panel as a control means, and the hoisting machine is driven by the control of the control panel, and the rope 3 travels by the drive, and the car 2 moves up and down. The hoisting machine is provided with a brake mechanism as a restricting means for restricting the movement of the car 2, and the movement of the car 2 is restricted and stopped by controlling the brake mechanism by the control panel.

  Entrance halls 8 are respectively provided in the elevator halls 7 on each floor of the building, and door devices 9 for opening and closing the doors 9 are installed at the entrances 8 respectively. The lowermost part of the hoistway 1 is a pit part 1a that is lower than the floor surface of the elevator hall 7 on the lowest floor, and equipment such as a buffer 10 is installed on the floor part of the pit part 1a.

  When maintenance work is performed in the pit section 1a, an operator manually opens the door device 9 of the elevator hall 7 on the lowest floor, enters the pit section 1a from the entrance 8 of the elevator hall 7, and After the work is finished, the passenger exits the elevator hall 7 from the pit portion 1a.

  A portion adjacent to the entrance / exit 8 of the pit portion 1a is an entrance / exit, and a pit ladder 11 is installed on the wall surface of the pit portion 1a on the entrance / exit side. The worker enters and leaves the pit portion 1a through the pit ladder 11.

  The car 2 includes a car frame 13 and a car room 14 installed inside the car frame 13. FIG. 2 shows a front view of the lower part of the car 2, and FIG. 3 shows a side view of the lower part of the car 2. An emergency stop device 15 for emergency stopping the car 2 is provided at the bottom of the car frame 13 constituting the car 2. The emergency stop device 15 is provided on both sides of the car frame 13.

  The car 2 moves up and down along a guide rail (not shown) provided vertically in the hoistway 1. The emergency stop device 15 includes a wedge mechanism 16 that can be engaged with the guide rail, and the cage 2 is engaged so that the wedge mechanism 16 bites into the guide rail, thereby emergency stopping the car 2. The wedge mechanism 16 of the emergency stop device 15 is linked to the link mechanism 17 and is driven via the link mechanism 17 when the car 2 moves beyond a predetermined speed.

  An apron 20 is provided at the lower part of the front side of the car 2. The apron 20 is provided so as to protrude vertically downward from the car frame 13. Further, the car 2 is provided with a pair of support frames 21 located on both sides of the apron 20. Each support frame 21 is provided below the car frame 13 so as to protrude vertically with a length longer than the height of the apron 20.

  A light emitting element 24 a and a light receiving element 24 b constituting the safety sensor 23 are provided at the lower end of the support frame 21. The light emitting element 24a is attached to the lower end portion of one support frame 21, and the light receiving element 24b is attached to the lower end portion of the other support frame 21 so as to face the light emitting element 24a.

The safety sensor 23 emits light from the light emitting element 24a toward the light receiving element 24b, and detects a person based on whether or not the light is incident on the light receiving element 24b. The detection signal of the safety sensor 23 is sent to the control panel.
Next, the operation will be described.

  At the time of maintenance and inspection of the elevator, an operator travels from the elevator hall 7 through the pit ladder 11 and descends into the pit part 1a, and performs maintenance and inspection work on equipment such as the buffer 10 on the inner bottom of the pit part 1a and the lower part of the car 2. carry out. Then, after the work is completed, the worker travels down the pit ladder 11 and returns to the elevator hall 7.

  When starting the maintenance and inspection work, the safety circuit switch (not shown) is operated to open the normal operation circuit of the car 2. However, if the operation is neglected or forgotten, the work is started from the pit portion 1a. When the car 2 unexpectedly descends before a worker leaves, the presence of the worker is detected by the safety sensor 23 in accordance with the descending of the car 2, and the car 2 stops.

  That is, when the car 2 exceeds a predetermined level and descends into the pit portion 1a, a part (head) of the worker is interposed between the light emitting element 24a and the light receiving element 24b of the safety sensor 23, The incidence of light from the light emitting element 24a to the light receiving element 24b is blocked, and a signal due to this blocking is sent to the control panel, and the brake mechanism of the hoisting machine operates under the control of the control panel based on the signal, so Is regulated and comes to an emergency stop.

  In particular, in this embodiment, since the safety sensor 23 is arranged on the front side of the car 2, that is, the part corresponding to the entrance / exit side of the worker in the pit part 1a, the work in the pit part 1a is completed. When a worker tries to leave the pit section 1a, if another worker who has already operated the car 2 is misunderstood that the worker has already left the pit section 1a, the pit section 1a A worker who is about to leave can be accurately detected by the safety sensor 23 and the car 2 can be emergency-stopped. Therefore, workers are not caught in the car 2 and safety is ensured.

  4 and 5 show a second embodiment. In this embodiment, an ultrasonic oscillator 25 capable of detecting a person is attached to the lower end portion of each support frame 21 provided on the front side of the car 2 as the safety sensor 23. These ultrasonic oscillators 25 are sensors that can detect the presence of a person when the person is relatively close to the periphery of the oscillator 25 by a certain distance, and the person is detected by the ultrasonic oscillator 25. The time signal is sent to the control panel, and the brake mechanism of the hoisting machine is operated by the signal.

  In this embodiment, when the car 2 unexpectedly descends before the worker leaves the pit part 1a, the presence of the person is detected by the ultrasonic oscillator 25 of the safety sensor 23, and the signal of the detection is detected. Is sent to the control panel, and the brake mechanism of the hoisting machine is operated by the control of the control panel, the movement of the car 2 is restricted and the emergency stop is made. Therefore, workers are not caught in the car 2 and safety is ensured.

  6 and 7 show a third embodiment. In this embodiment, an ultrasonic oscillator 25 capable of detecting a person is attached to the lower end of the apron 20 provided on the front side of the car 2 as the safety sensor 23. These ultrasonic oscillators 25 are sensors that can detect the presence of a person when the person is relatively close to the periphery of the oscillator 25 by a certain distance, and the person is detected by the ultrasonic oscillator 25. The time signal is sent to the control panel, and the brake mechanism of the hoisting machine is operated by the signal. A plurality of, for example, two ultrasonic oscillators 25 are attached to the lower end of the apron 20 side by side.

  In this embodiment, when the car 2 unexpectedly descends before the worker leaves the pit part 1a, the presence of the person is detected by the ultrasonic oscillator 25 of the safety sensor 23, and the signal of the detection is detected. Is sent to the control panel, and the brake mechanism of the hoisting machine is operated by the control by the control panel based on the signal, and the movement of the car 2 is restricted and the emergency stop is made. Therefore, workers are not caught in the car 2 and safety is ensured.

  8 and 9 show a fourth embodiment. In this embodiment, a safety sensor 30 is provided on the inner wall surface of the pit portion 1a. The safety sensor 30 is attached to a level position at a predetermined height from the floor surface of the pit portion 1a, that is, a level position above the standard height of the worker in the pit portion 1a. A sensor capable of detecting when the car 2 is interposed, and an optical sensor using a light emitting element and a light receiving element similar to those in the first embodiment, and the second and third implementations. It is possible to employ a sonic sensor using an ultrasonic oscillator as in the form. A signal detected by the safety sensor 30 is sent to the control panel, and the brake mechanism of the hoisting machine is operated by the control panel based on the signal.

  The work in the pit section 1a is usually performed at a low level position where the worker's feet are attached to the floor surface of the pit section 1a, but sometimes at a higher level position than usual by using a stepladder or the like. Work may be performed. At this time, the worker approaches the position of the car 2, and when the car 2 moves unexpectedly, the risk of contact with the car 2 increases.

  However, in the fourth embodiment, when an operator gets on a stepladder and moves to a predetermined level position higher than usual, this is detected by the safety sensor 30, and a signal of the detection is sent to the control panel, The brake mechanism of the hoisting machine operates under the control of the control panel based on the signal, and the movement of the car 2 is restricted. Therefore, it is possible to eliminate the risk of the worker coming into contact with the car 2 and to ensure safety.

  Further, when the car 2 unexpectedly descends to reach a predetermined level position in the pit portion 1a before the worker leaves the pit portion 1a, it is detected by the safety sensor 30, A detection signal is sent to the control panel, and the brake mechanism of the hoisting machine is operated under the control of the control panel based on the signal, and the movement of the car 2 is restricted and the emergency stop is made. This emergency stop position is a level position higher than the height of the person, so that the worker is not caught in the car 2 and safety is ensured.

  FIG. 10 shows a fifth embodiment. In this embodiment, the safety sensor 31 is disposed on the pit ladder 11 provided at the entrance / exit of the pit portion 1a. The pit ladder 11 includes a pair of vertical bars 11a extending in parallel in the vertical direction, and a plurality of step bars 11b installed horizontally at a predetermined interval in the vertical direction between the vertical bars 11a.

  A bracket 33 is horizontally mounted on the inner wall surface of the pit portion 1a, and the pit ladder 11 is supported by the wall surface of the pit portion 1a via the bracket 33. That is, the bracket 33 is provided with a horizontal support piece 34, and one step bar 11 b in the middle stage of the pit ladder 11 is arranged on the support piece 34 so as to face the support piece 34, and between the support piece 34 and the step bar 11 b. A plurality of compression springs 35 are interposed, and the pit ladder 11 is supported via the compression springs 35 so as to be movable up and down with respect to the bracket 33. A safety sensor 31 is provided between the support piece 34 and the tread bar 11b. The safety sensor 31 is composed of, for example, a load sensor, and a signal at the time of load detection is sent to the control panel, and the brake mechanism of the hoisting machine is operated by the signal.

  In this embodiment, when the work in the pit portion 1a is completed and the worker gets on the stepping rail 11b of the pit ladder 11 to get out of the pit portion 1a, the pit ladder 11 is compressed by the load. 35, the safety sensor 31 is operated by this movement, the signal is sent to the control panel, the brake mechanism of the hoisting machine is operated by the control panel, and the car 2 Movement is restricted and the stopped state is maintained. Therefore, when the car 2 is unexpectedly lowered before the worker tries to get out of the pit portion 1a through the pit ladder 11, the car 2 is brought to an emergency stop so that the worker is caught by the car 2. There is nothing and safety is ensured.

  Further, even when another elevator maintenance worker operates the car 2 when the worker tries to leave the pit portion 1a through the pit ladder 11, the car 2 does not move, For this reason, a worker is not caught in the car 2, and safety is ensured.

  In each of the above embodiments, the hoisting machine brake mechanism is used as a restricting means for restricting the movement of the car. For example, an emergency stop device that operates when the car moves over a predetermined speed is used as the restricting means. It is also possible.

DESCRIPTION OF SYMBOLS 1 ... Hoistway 1a ... Pit part 2 ... Car 7 ... Elevator hall 11 ... Pit ladder 11a ... Vertical rail 11b ... Tread rail 20 ... Apron 21 ... Support frame 23 ... Safety sensor 24a ... Light emitting element 24b ... Light receiving element 25 ... Super Sound wave oscillator 30 ... Safety sensor 31 ... Safety sensor 33 ... Bracket 34 ... Supporting piece

Claims (5)

Whether it is placed in the elevator hoistway and moves up and down,
It is possible to detect the operation when the car descends to the pit part before the worker who enters the pit part at the lowest part of the hoistway and performs maintenance work exits the pit part. A safety sensor;
Restriction means for restricting movement of the car in response to the detection by the safety sensor;
An elevator inspection safety device characterized by comprising:   The safety for elevator inspection work according to claim 1, wherein the safety sensor is disposed at a lower end portion of a support frame that protrudes downward from a lower portion of the front side of the car. apparatus.   The safety device for an elevator inspection work according to claim 1, wherein the safety sensor is disposed at a lower end portion of an apron provided at a lower portion of the front side of the car so as to protrude downward. .   2. The safety device for elevator inspection work according to claim 1, wherein the safety sensor is disposed at a level position of a predetermined height on the inner wall surface of the pit portion. Whether it is placed in the elevator hoistway and moves up and down,
Regulation means capable of regulating movement of the car;
A lowermost pit portion of the hoistway;
A pit ladder provided in the pit portion and used for a maintenance inspection worker to enter and exit the pit portion;
A safety sensor that detects a load applied when an operator gets on the pit ladder and rides, and operates the regulating means according to the detection,
An elevator inspection safety device characterized by comprising:

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