JP2008019064A - Fall prevention device of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fall prevention device of elevators capable of operating an emergency stop device by engaging emergency stop means with each other if the unintended fall of a car occurs due to leakage of oil. <P>SOLUTION: An elevator having the emergency stop device 4 holding the car 2 on a guide rail 3 by operating when a rope is broken or loosened comprises fall prevention means 7, 11. The fall prevention means are so positioned that they are not overlapped with each other in a plane and do not interfere with the lifting of the car while the car is traveling, moved to the position where they are overlapped with each other in a plane and interfere with each other when the car is stopped and a door is open, and operate the emergency stop device by engaging with each other if an unintended fall of the car occurs. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an elevator descent prevention device capable of preventing unintended descent of a car.

In a hydraulic elevator equipped with an emergency stop device, it is impossible to prevent an unintended descent of a car unless it is overspeed or the rope is loosened or certain conditions are not satisfied.
Conventional hydraulic elevators were also equipped with a fall prevention device, but mainly used to prevent the fall due to rope breakage during normal lifting operation. In the case of hydraulic elevators, overspeed due to failure of the hydraulic system and the possibility of the car falling due to oil leakage from the hydraulic piping and pipe joints are extremely low. Application of an emergency stop device that works when relaxed is permitted.
However, in recent years, the free arrangement of the machine room, which is a merit of the hydraulic elevator, has been widely adopted, and there are some cases where the hydraulic piping is placed in an environment where rusting and corrosion is likely to occur outdoors. It has become. Therefore, if the maintenance is insufficient, an unexpected oil leakage may occur, which may hinder the lifting operation.

  As a conventional hydraulic elevator descent prevention device, in a hydraulic elevator equipped with emergency stop means on the side of the car to grasp the guide rail that guides the raising and lowering of the car, the car door is opened. There is provided an abnormal descent means for detecting an abnormal descent of the car in a state where the vehicle is in operation and an operating means for operating the emergency stop means based on the abnormal descent detection output of the abnormal descent means (for example, Patent Document 1) reference).

JP 2002-316781 A

  In the conventional hydraulic elevator descent prevention device, the descent of the car when the door is opened is discriminated by an electric signal, and the emergency stop is operated directly by the actuator. The emergency stop does not operate at the time of power failure or actuator failure. There was a problem in reliability because it was not fail-safe.

  The present invention has been made to solve the above-described problems. The emergency stop operation means are positioned so as not to interfere with each other when the car is running, and the emergency stop operation means interfere with each other when the car is stopped and the door is opened. An elevator descent prevention device is provided in which an emergency stop operating means is engaged with each other to operate an emergency stop device when an unintentional lowering of the car occurs.

  The elevator descent prevention device according to the present invention is an elevator equipped with an emergency stop device that operates when the rope breaks or relaxes and holds the car on the guide rail. When the car is not wrapped and does not interfere with the raising and lowering of the car, and when the car is stopped or opened, it moves to a position where it overlaps with each other and interferes with each other, causing an unintended descent of the car. And a descent prevention means that engages each other to operate the emergency stop device.

  According to the present invention, when an unintended car descent occurs due to oil leakage or the like, the car descends by a certain amount of distance and the distance until the emergency stop device operates, but the amount of descent is about 200. It is restrained in the range of ˜300 mm, and passengers are not caught between the opening of the hall and the opening of the car. In addition, the actuator is activated when the car is running, and the actuator is deactivated when the car is stopped or opened. Therefore, the emergency stop device does not operate during a power failure or actuator failure, improving reliability. can do.

Embodiment 1.
1 to 3 show a hydraulic elevator lowering prevention apparatus according to Embodiment 1 of the present invention. FIG. 1 is a side view showing a normal stop and door open state, FIG. 2 is a side view showing a state during traveling, and FIG. 3 is a side view showing an unintended lowering state of the car.

In the figure, reference numeral 1 is a landing door, 2 is a hydraulic elevator car, 2a is a car door, and a driving device that automatically opens and closes the car door 2a only when the car 2 reaches the arrival floor. (Not shown) and the landing door 1 are engaged to operate. The car 2 is held by a rope (rope), and the rope is held by a hydraulic jack (not shown). In addition, pressure oil is sent from a hydraulic power unit (not shown) disposed in the machine room to a cylinder (not shown) via a pressure pipe, and the car 2 moves up and down. Reference numeral 3 denotes a guide rail that guides the elevator car 2 up and down, and reference numeral 4 denotes a slack rope type emergency stop device provided at the lower part of the elevator car 2, which operates when the rope breaks or relaxes and holds the elevator car 2. Reference numeral 5 denotes an emergency stop operating lever provided in the slack rope type emergency stop device 4, and 6 denotes a lifting rod of the emergency stop operating lever 5, and a lower end portion thereof is connected to the emergency stop operating lever 5. An actuator 7 is rotatably attached to the upper portion of the car 2 by a fulcrum pin 8 and is composed of a solenoid 9 that operates by an electric signal or the like and a protruding lever 10 that moves forward and backward by demagnetization / excitation of the solenoid 9. Yes. The upper end of the lifting bar 6 of the emergency stop lever 5 is connected to the tip of the protruding lever 10 of the actuator 7. Reference numeral 11 denotes an operation plate attached to the guide rail 3 in the horizontal direction for each floor. The operation plate 11 is mounted at a position where, when an unintentional descent of the car such as oil leakage occurs, the car 2 is lowered by a certain amount of distance and a distance until the emergency stop device operates. A position where the amount is restricted to a range of about 200 to 300 mm is desirable. The actuator 7 and the operation plate 11 constitute a descent preventing means for operating the safety device 4.
The actuator 7 excites the solenoid 9 only when the car 2 is running to operate the actuator 7 to hold the protruding lever 10 in the retracted position where it does not interfere with the operation plate 11. Thus, during traveling, the protruding lever 10 and the operation plate 11 do not overlap each other in a plane, and pass at a position where they do not interfere with each other even when the car is raised or lowered (see FIG. 2).
Further, when the car 2 is normally stopped and opened, the solenoid 9 is demagnetized to deactivate the actuator 7, and the protruding lever 10 is moved to the protruding position where it interferes with the operation plate 11 (see FIG. 1). Accordingly, when the vehicle is stopped and the door is open, the protruding lever 10 and the operation plate 11 overlap each other in a planar manner. For example, when the car is lowered indefinitely due to a small amount of oil leakage from the pipe joint, a certain amount The operation plate 11 pushes up the protruding lever 10 until it descends, pulls up the emergency stop operating lever 5 through the lifting rod 6 and operates the emergency stop device 4 (see FIG. 3).

According to Embodiment 1 of the present invention, when an unintended descent of the car such as oil leakage occurs, the car is lowered by a certain amount of distance and the distance until the emergency stop device operates. The amount of descent is suppressed to a range of about 200 to 300 mm, and passengers are not caught between the opening of the hall and the opening of the car. In addition, since the actuator is in an operating state during traveling, and the actuator is in a non-operating state when stopped and opened, the emergency stop device does not operate at the time of a power failure or failure of the actuator, and reliability can be improved. .
In this embodiment, the case where the descent prevention device is applied to a hydraulic elevator has been described. However, even if the descent prevention device is applied to a rope type elevator, the car can be prevented from descending.

Embodiment 2.
FIG. 4 is a cross-sectional view of a main part showing a hydraulic elevator descent prevention device according to Embodiment 2 of the present invention, and FIG. 5 is a main part plan view of a hydraulic elevator descent prevention device according to Embodiment 2 of the present invention. is there. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 1, or an equivalent, and description is abbreviate | omitted.

In the second embodiment, a connection operation lever 13 that operates the emergency stop operation lever 5 via the connection shaft 12 is installed at one end of the emergency stop operation lever 5. An L-shaped projecting lever 15 is provided at the other end of the connection operating lever 13 and is pivotally attached to the lower portion of the car 2 by a fulcrum pin 14. On the other hand, an interlocking engagement plate 16 corresponding to the L-shaped protruding lever 15 is directly attached to the lower end portion on the open end side of the landing door 1. Then, only when the landing door 1 is open, the L-shaped protruding lever 15 and the interlocking engagement plate 16 provided at the other end of the coupling operating lever 13 overlap each other in plan and engage with each other. It is configured to do. Further, when the landing door 1 is closed, the L-shaped protruding lever 15 and the interlocking engagement plate 16 do not overlap each other in a planar manner, and pass in a position where they do not interfere with each other when the car 2 is raised or lowered. . The position at which the L-shaped protruding lever 15 and the interlocking engagement plate 16 are in contact with each other is a distance for a certain amount of distance and the distance to the operation of the emergency stop device when the car is lowered due to oil leakage or the like. The car 2 descends, but a position where the amount of descending is suppressed to a range of about 200 to 300 mm is desirable. The L-shaped protruding lever 15 and the interlocking engagement plate 16 constitute a descent prevention means for operating the emergency stop device 4.
In the door open state of the car 2, the interlocking engagement plate 16 attached to the lower end portion of the landing door 1 is moved to a position where it interferes with the L-shaped protruding lever 15, that is, a position where it engages and contacts (FIG. 5). reference). Thereby, in the door open state, the L-shaped protruding lever 15 and the interlocking engagement plate 16 overlap each other in a plane, and an unintended unrestricted descent of the car occurs due to, for example, a small amount of oil leakage from the pipe joint. In this case, the interlocking engagement plate 16 pushes up the L-shaped projecting lever 15 until it is lowered by a certain amount, and the emergency stop operating lever 5 is pulled up via the connection operation lever 13 and the connection shaft 12 to operate the emergency stop device 4.

According to Embodiment 2 of the present invention, when an unintended descent of the car such as oil leakage occurs, the car is lowered by a certain amount of distance and the distance until the emergency stop device operates. The amount of descent is suppressed to a range of about 200 to 300 mm, and passengers are not caught between the opening of the hall and the opening of the car. In addition, since the actuator is in the operating state during running and the actuator is in the non-operating state when stopped and when the door is opened, the emergency stop device does not operate during a power failure or actuator failure, improving reliability. it can.
In this embodiment, the case where the descent prevention device is applied to a hydraulic elevator has been described. However, even if the descent prevention device is applied to a rope type elevator, the car can be prevented from descending.

It is a side view at the time of the normal stop and door opening which show the fall prevention device of the hydraulic elevator in Embodiment 1 of this invention. It is a side view at the time of the travel which shows the fall prevention apparatus of the hydraulic elevator in Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of an unintended car descending state showing a hydraulic elevator descent preventing apparatus according to Embodiment 1 of the present invention. It is principal part sectional drawing which shows the fall prevention apparatus of the hydraulic elevator in Embodiment 2 of this invention. It is a principal part top view which shows the fall prevention apparatus of the hydraulic elevator in Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door 2 Car cage 2a Car door 3 Guide rail 4 Slack rope type emergency stop device 5 Emergency stop operation lever 6 Lifting bar 7 Actuator 8 Support pin 9 Solenoid 10 Protrusion lever 11 Operation plate 12 Connection shaft 13 Connection operation lever 14 Support pin 15 L-shaped protruding lever 16 Interlocking engagement plate

Claims (5)

In an elevator equipped with an emergency stop device that operates when the rope breaks or relaxes and holds the car to the guide rail,
When the car is running, it is in a position where it does not overlap with each other in a plane and does not interfere with the raising and lowering of the car, and when the car is stopped and in the door open state, it overlaps with each other and interferes with each other. An elevator descent prevention device comprising descent prevention means that engage with each other and operate the emergency stop device when an unintended passenger car descent occurs when moved to a position.   2. The elevator descent prevention device according to claim 1, wherein the elevator is a hydraulic elevator.   The descent prevention means is provided at the upper part of the car, and is an actuator comprising a solenoid operated by a door open / close signal and a protruding lever for operating an emergency stop device, which operates freely by the demagnetization / excitation of the solenoid, and a guide rail And when the protruding lever protrudes when the car is stopped and the door is open, the protruding lever and the operating plate overlap each other in a plane and interfere with each other. 3. A descent prevention device for an elevator overnight according to claim 1 or 2.   The descent prevention means is provided at the lower part of the car and includes a protruding lever for operating the emergency stop device and an interlocking engagement plate attached to the lower end of the landing door. 3. The projecting lever and the interlocking engagement plate overlap each other and interfere with each other when the interlocking engagement plate moves together with the landing door. Elevé overnight descent prevention device.   5. The elevator descent prevention device according to claim 1, wherein the emergency stop device is a slack rope type emergency stop device.

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