JP2006341953A - Emergency stop device of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an emergency stop device of an elevator capable of reducing the capacity of an actuator. <P>SOLUTION: The device comprises an actuator (electromagnet 11) to be operated when the elevating speed of a car 3 exceeds a predetermined value, a damper 12 which is slidably brought into contact with a guide rail 2 according to the operation of the actuator 11 to decelerate and stop the car 3, a holding means 13 which is engaged with the actuator 11 to hold the damper 12 at the waiting position, a guide means 14 which is displaceably arranged in the direction orthogonal to the guide rail 2 and has an inclined surface to guide the damper 12 naturally dropped by the self-weight as the holding means 13 is released in the direction slidably contact with the guide rail 2, and a spring 15 to press the guide means 14 in the direction of the guide rail 2. The damper 12 naturally dropped by the self weight in a space between the guide rail 2 and the guide means 14 as the holding means 13 is released is pressed against the guide rail 2 by the spring 15 via the guide means 14 to obtain the braking force. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an emergency stop device for an elevator, and in particular, brakes the car when the car speed exceeds a predetermined value using an actuator or when the car travels in an uncontrolled state in the upward direction. The invention relates to an emergency stop device for an elevator.

  Conventionally, as an elevator braking device that uses an actuator to brake a car, an actuator that has an operating force that resists spring force and is powered off under a predetermined condition, and the spring force according to the power cut-off of the actuator. There is also provided a brake that slides on the guide rail to decelerate and stop the car. The brake device using the actuator configured as described above is applied as an emergency stop device for an elevator that brakes the car when the car speed exceeds a predetermined value. It has been proposed to use it as a means for preventing the overspeed of the car in the ascending direction that is obligated in (see, for example, Patent Document 1).

JP-A-10-218524 (paragraph numbers 0008 to 0023, FIG. 2)

  However, in the above-described conventional braking device, in order to stop the car by sliding the brake element against the guide rail by the spring force, it is necessary to set a spring force above a certain level, while for the normal running of the car. In order to keep the spring loaded with a spring force constantly open, the actuator must have an actuating force that resists the spring force. Therefore, it is necessary to increase the capacity of the actuator. There has been a problem of increasing the size and increasing the installation cost. Further, even if the actuator has a suction force that resists the spring force, it is necessary to further increase the capacity of the actuator in order to ensure a sufficient gap between the brake and the guide rail.

  The present invention has been made from the above-described prior art, and an object of the present invention is to provide an emergency stop device for an elevator capable of reducing the actuator capacity.

  In order to achieve the above object, the present invention provides a frame attached to an upper part of a car when the rising speed of the car exceeds a predetermined value or when the car is in an uncontrolled state in the rising direction. An actuator that is powered off when traveling, a brake that slides against the guide rail and decelerates and stops the car in response to the power cutoff of the actuator, and a spring that can press the brake in the direction of the guide rail In the elevator emergency stop device, the frame body is provided with a holding means that is engaged with the actuator and holds the brake element in a standby position, and is displaceably disposed on the guide rail side. Guide means having an inclined surface for guiding the brake element that falls by its own weight in response to the release of the guide rail in a direction in sliding contact with the guide rail, and the spring The brake means is arranged so as to press in the direction of the guide rail, and the brake element that has fallen by its own weight into the gap between the guide rail and the guide means in response to the release of the holding means is moved by the spring through the guide means. A braking force is obtained by pressing the guide rail.

  In the present invention configured as described above, when the rising speed of the car exceeds a predetermined value due to some factor or when the car runs in an uncontrolled state in the rising direction, the power supply of the actuator is cut off. In response to power-off, the holding means releases the brake element held at the standby position at the normal time. In response to this opening, the brake element is guided by the inclined surface of the guide means and falls by its own weight into a gap between the guide rail and the guide means, and the brake element is further raised by the raising of the car. The spring is compressed via In response to this, the spring causes the braking force to be generated by pressing the brake element against the guide rail via the guide means by the reaction force, and the car is decelerated and stopped. Accordingly, since the spring force of the spring is not normally applied to the brake element, the actuator only needs to have an operation force for holding the weight of the brake element at the standby position. The capacity can be made smaller than that of an actuator having an actuation force that resists the spring force as in the prior art.

  According to the present invention, the actuator can be made to have a small capacity having an operating force enough to hold the weight of the brake, and as a result, the apparatus can be downsized and the installation cost can be reduced. Further, since the actuator is used only to hold the weight of the brake element, it is possible to ensure a sufficient gap between the brake element and the guide rail.

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

  FIG. 1 is a main part plan view showing an embodiment of an emergency stop device for an elevator according to the present invention, FIG. 2 is a front view of the main part showing an embodiment of the emergency stop device, and FIG. 3 is a brake shown in part A of FIG. 4 is an enlarged side view of the child, FIG. 4 is a side view of an essential part showing an embodiment of the safety device, FIG. 5 is a schematic structural view showing the overall structure of the safety device, and FIG. 6 is a speed governor shown in part B of FIG. It is an enlarged view of (hereinafter referred to as governor).

  As shown in FIG. 5, the emergency stop device for an elevator according to the present embodiment is installed at the upper part of the hoistway 1 and detects the descending and elevating overspeeds of the car 3 that is guided by the guide rail 2 and moves up and down the hoistway 1. A governor 4 for urgently stopping the car 3, a governor pulley 5 provided in the governor 4, a weight pulley 6 installed in the lower part of the hoistway 1, and the governor pulley 5 and the weight pulley 6 are wound around the car 3 and a governor rope 7 that is connected to 3 and moves in synchronism with its elevation.

 Further, as shown in FIG. 6, the governor 4 includes a speed detection switch 4a for detecting that the ascending speed of the car 3 is 1.3 times a predetermined value, for example, and as shown in FIG. The operation signal of the speed detection switch 4a is sent to the control unit 9 via the governor signal line 8.

  As shown in FIGS. 1 and 2, the car 10 is attached to the cross head of the car 3 and the car 3 is de-energized when the ascending speed of the car 3 exceeds a predetermined value. An actuator to be operated, for example, an electromagnet 11, a brake 12 that slides on the guide rail 2 in response to demagnetization of the electromagnet 11 and decelerates and stops the car 3, and is engaged with the electromagnet 11 and puts the brake 12 in a standby position. Holding means 13 that is held by the guide rail 2, and is disposed so as to be displaceable on the side of the guide rail 2, and has an inclined surface that guides the brake element 12 that falls by its own weight in accordance with the opening of the holding means 13 in the direction of sliding contact with the guide rail 2. When the guide means 14 is arranged to press the guide means 14 in the direction of the guide rail 2, and the spring 15 capable of pressing the brake 12 in the direction of the guide rail 2 and the guide means 14 are arranged below the guide means 14. Attached to monitor frame 10, brake shoe 12a to fall in response to the opening of the holding means 13, the lower end of 12b is adjustable shims 18a the height position abuts, and the 18b are provided. Note that the electromagnet 11 is demagnetized via the tail cord 16 shown in FIG. 5 in response to detection of excess speed of the speed detection switch 4a.

  The brake 12 described above includes a first brake 12 a and a second brake 12 b disposed so as to sandwich the guide rail 2 from two directions, and the brake 12 slides on the guide rail 2. It is formed in a wedge shape having a vertical surface that can contact and an inclined surface parallel to the inclined surface of the guide means 14.

 The holding means 13 described above includes an arm 13a having an intermediate portion pivotally supported by the frame body 10, one end engaged with the electromagnet 11, and the other end holding the brake 12 at the standby position, and the arm 13a. It has a plate 13b attached to the other end, and a guide bolt 13c attached to the plate 13b and locking the brake 12 at its tip.

 As shown in FIG. 4, the guide means 14 described above includes guide plates 14 a and 14 b having inclined surfaces that guide the brake 12 that falls in accordance with the opening of the holding means 13 in a direction in which the brake element 12 slides on the guide rail 2. At the same time, the guide plates 14a and 14b are fixed to the shaft body 20 supported at both ends to the frame body 10 via the lock nuts 19a and 19b so that the guide plates 14a and 14b can be displaced. The spring force is received evenly on the left and right sides by interlocking with each other.

 The aforementioned spring 15 is composed of a disc spring through which the shaft body 20 is inserted to guide the inner diameter thereof and which is interposed between the frame body 10 and the guide plate 14a.

  Further, as shown in FIG. 3, a roller 21 is interposed between the brake element 12a and the guide plate 14a so that the weight of the brake element 12a can be smoothly dropped, and the brake element 12a A stopper pin 22 for preventing the roller 21 from dropping is provided at the lower end. Here, the brake element 12a is taken as an example, but the brake element 12b has the same structure.

  In the emergency stop device of the present embodiment, when the speed detection switch 4a detects that the ascending speed of the car 3 exceeds a predetermined value due to some factor, the operation signal of the speed detection switch 4a is sent to the governor signal line 8. The control unit 9 demagnetizes the electromagnet 11 via the tail cord 16. In response to this demagnetization, the holding means 13 opens the brake 12 held at the standby position during normal times. That is, as shown by an arrow C in FIG. 4, demagnetization of the electromagnet 11 releases the excitation of the electromagnet 11 at one end of the arm 13a, and the other end of the arm 13a is the weight of the brake 12, plate 13b, and guide bolt 13c. To descend. The brake 12 is guided by the inclined surfaces of the guide plates 14a and 14b and falls by its own weight into the gap between the guide rail 2 and the guide plates 14a and 14b, and the brake 12 is further lifted by the elevator car 3 and the guide plates 14a and 14b. The spring 15 is compressed via In response to this, the spring 15 presses the brake 12 against the guide rail 2 via the guide plates 14a and 14b by the reaction force, thereby generating a braking force, and the car 3 is decelerated and stopped. In addition, the fall position is restrict | limited by the brake element 12 contact | abutting to shim 18a, 18b at the time of own weight fall.

  According to the emergency stop device of the present embodiment configured as described above, since the spring force of the spring 15 is not loaded on the brake 12 at normal time, the electromagnet 11 reduces the weight of the brake 12 at the standby position. It is only necessary to have a suction force to be held, and therefore the capacity can be reduced. Further, since the electromagnet 11 is used only to hold the weight of the brake 12, it is possible to ensure a sufficient gap between the brake 12 and the guide rail 2. Further, the height position of the shims 18a and 18b can be adjusted to limit the falling position of the wedge-shaped brake 12 to control the compression force of the spring 15, thereby adjusting the braking force of the emergency stop device. It is possible to plan.

  In the present embodiment, an example in which the electromagnet 11 is provided as an actuator has been shown, but a motor, a linear motor, or the like can also be used.

  In the present embodiment, the brake 12 is constituted by the first brake 12 a and the second brake 12 b disposed so as to sandwich the guide rail 2 from two directions, but the present invention is not limited to this. First, a movable brake element disposed on one side facing the guide rail 2 and falling by its own weight in response to the release of the holding means 13, and a fixed fixed braking disposed on one side facing the guide rail 2. It can also consist of children. Further, the holding means 13 is constituted by the arm 13a, the plate 13b, and the guide bolt 13c. However, the present invention is not limited to this, and when there is a space, the plate is directly formed by the actuator such as the electromagnet 11 without an arm. The brake element may be held and released by operating 13b. Further, each of the first brake element 12a and the second brake element 12b is formed in a wedge shape having a vertical surface slidable on the guide rail 2 and an inclined surface parallel to the inclined surface of the guide means 14. The present invention is not limited to this, but may have other shapes, for example, a rectangular shape, or only one brake element may have a wedge shape. Furthermore, the fact that the ascending speed of the car 3 has exceeded a predetermined value, or that the car 3 has traveled in an uncontrolled state in the ascending direction, can be achieved by setting the speed detection switch of the elevator governor to two contacts, It can be detected by amplifying the operation signal of the switch.

It is a principal part top view which shows one Embodiment of the emergency stop apparatus of the elevator of this invention. It is a principal part front view which shows one Embodiment of an emergency stop apparatus. FIG. 3 is an enlarged view of a brake element shown in part A of FIG. 2. It is a principal part side view which shows one Embodiment of an emergency stop apparatus. It is a schematic structure figure showing the whole emergency stop device structure. It is an enlarged view of the governor shown to the B section of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hoistway 2 Guide rail 3 Passenger car 4 Governor 4a Governor speed detection switch 5 Governor pulley 6 Weight pulley 7 Governor rope 8 Governor signal wire 9 Control part 10 Frame 11 Electromagnet 12 Braking element 13 Holding means 13a Arm 13b Plate 13c Guide bolt 13c Means 14a, 14b Guide plate 15 Spring 16 Tail cord 18a, 18b Shim 19a, 19b Lock nut 20 Shaft body
21 Roller 22 Stopper pin

Claims (6)

Actuator that is powered off when the rising speed of the car exceeds a predetermined value or when the car travels in an uncontrolled state in the ascending direction on a frame attached to the upper part of the car, this actuator In an emergency stop device for an elevator provided with a brake that slides in contact with a guide rail in response to power interruption of the vehicle and decelerates and stops the car, and a spring that can press the brake in the direction of the guide rail.
A holding means that engages with the actuator and holds the brake at a standby position and is displaceable to the guide rail side on the frame, and falls by its own weight when the holding means is released. Guide means having an inclined surface for guiding the brake in a direction in sliding contact with the guide rail, and the spring is disposed so as to press the guide means in the guide rail direction. A braking force is obtained by pressing the brake element, which has fallen by its own weight into the gap between the guide rail and the guide means, by the spring against the guide rail via the guide means. Emergency stop device.   The holding means has an intermediate portion pivotally supported by the frame body, the actuator as an electromagnet, one end engaged with the electromagnet, and the other end holding the brake at a standby position, The elevator emergency stop device according to claim 1, further comprising an arm that is disengaged from the electromagnet by demagnetization of the electromagnet and descends at the other end.   A shim is provided below the guide means so that the lower end of the brake element that falls in response to the opening of the holding means is in contact, and the pressing force of the spring can be changed by adjusting the shim height. The elevator emergency stop device according to claim 1.   The guide means is fixed to a shaft body that is displaceably supported by the frame body, and the spring is guided by an inner diameter of the shaft body through which the shaft body is inserted, and between the frame body and the guide means. The elevator emergency stop device according to claim 1, wherein the elevator emergency stop device is interposed between the elevator emergency stop device and the elevator emergency stop device.   Two brake elements are disposed so as to sandwich the guide rail from two directions, and the guide means slides the two brake elements, which fall in response to the release of the holding means, with the guide rail. 2. The elevator emergency stop device according to claim 1, comprising two inclined surfaces facing each other in the direction.   2. The elevator emergency according to claim 1, wherein the brake element is formed in a wedge shape having a vertical surface capable of sliding contact with the guide rail and an inclined surface parallel to the inclined surface of the guide means. Stop device.

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