JP2021042005A - Governor device and safety system of elevator - Google Patents

Abstract

To provide a technology for preventing that the car vibration caused by the behavior of a user is falsely detected as an elevator abnormality.SOLUTION: A governor device comprises a governor pulley 21, flyweights 23, 24, and a detection switch 28A. The flyweights 23, 24 move to the position according to the rotating speed of the governor pulley 21 in the radial direction around the rotation axis 21a of the governor pulley 21 by rotating with the governor pulley 21. The detection switch 28A can switch between a first state and a second state, and the detection switch switches from the first state to the second state when the rotating speed of the governor pulley 21 becomes a predetermined speed and the flyweights 23, 24 reaches the predetermined position in the radial direction and returns from the second state to the first state when the rotating speed of the governor pulley 21 becomes smaller than the predetermined speed and the flyweights 23, 24 retreat from the predetermined position.SELECTED DRAWING: Figure 4

Description

The present invention relates to a technique for ensuring safety in an elevator.

Some elevators are equipped with the following governor devices in order to safely stop the car in the event of an abnormality (see, for example, Patent Document 1). A governor pulley and a tension pulley are arranged at the upper and lower ends of the hoistway, and a governor rope is hung on them. The governor rope is connected to the car so as to rotate as the car goes up and down. There is. The governor pulley is provided with a fly weight that rotates together with the governor pulley, and the fly weight moves to a position corresponding to the rotation speed of the governor pulley in the radial direction about the rotation axis of the governor pulley. A stop switch that cuts off the supply of electric power to the hoist and stops the car is provided so that the fly weight contacts and switches when the rotation speed of the governor pulley reaches an abnormal overspeed.

According to such a governor device, when an abnormality occurs in the speed of the car, the abnormality can be detected as an abnormality in the rotation speed of the governor pulley. Then, when an abnormality occurs in the speed of the car and the rotation speed of the governor pulley reaches an abnormal overspeed, the power supply to the hoisting machine is cut off by switching the stop switch by contact with the fly weight. As a result, the car can be stopped in an emergency.

Japanese Unexamined Patent Publication No. 2006-143394

In the governor device described above, the governor rope rotates the governor pulley in conjunction with the movement of the car. On the other hand, the behavior of the user in the car becomes vibration and appears in the movement of the car, and affects the rotation speed of the governor pulley via the governor rope. That is, vibration according to the behavior of the user also appears in the rotation speed of the governor pulley. Therefore, even if there is no abnormality in the elevator, if the vibration of the car becomes large due to, for example, a user's violence in the car, the rotation speed of the governor pulley reaches an abnormal overspeed. As a result, the vibration of the car may be erroneously detected as an elevator abnormality by the stop switch.

Therefore, an object of the present invention is to provide a technique for preventing the vibration of the car caused by the behavior of the user from being erroneously detected as an abnormality of the elevator.

The governor device according to the present invention includes a governor pulley, a fly weight, and a detection switch. The governor pulley is rotated by a governor rope connected to the elevator car. By rotating together with the governor pulley, the fly weight moves to a position corresponding to the rotation speed of the governor pulley in the radial direction centered on the rotation axis of the governor pulley. The detection switch can be switched between the first state and the second state, and when the rotation speed of the governor pulley reaches a predetermined overspeed and the fly weight reaches a predetermined position in the radial direction, the detection switch starts from the first state. The second state is switched to, and when the rotation speed of the governor pulley becomes lower than the predetermined overspeed and the fly weight retracts from the predetermined position, the second state returns to the first state.

According to the governor device, the fly weight moves by centrifugal force to a position (position in the radial direction) corresponding to the rotation speed of the governor pulley as the governor pulley rotates. Therefore, the rotational speed of the governor pulley is accurately reflected in the position of the fly weight in the radial direction. Therefore, when such a fly weight movement is used to switch the detection switch from the first state to the second state, the timing at which the detection switch switches from the first state to the second state is the rotation speed of the governor pulley. It becomes easy to match the timing when becomes a predetermined overspeed with high accuracy. Therefore, by detecting the change of the detection switch from the first state to the second state, it is possible to accurately detect that the rotation speed of the governor pulley has reached a predetermined overspeed.

Further, the above-mentioned movement of the fly weight is also used for switching the detection switch from the second state to the first state, so that the detection switch is automatically activated when the rotation speed of the governor pulley becomes smaller than the predetermined overspeed. It becomes possible to return to the target. Therefore, the recovery of the detection switch does not require work by maintenance personnel (recovery work).

As an example, the detection switch has a swing portion, a first contact portion, and a second contact portion. The swinging portion is a seesaw type swinging portion, which realizes the first state when the swinging limit reaches the first swinging limit, and swings to the side opposite to the first swinging limit. The second state is realized when the second swing limit where the movement is regulated is reached. The first contact portion is provided at the first end portion, which is one of both ends of the swing portion, and the fly weight comes into contact with the fly weight in the process of moving to a predetermined position, thereby causing the swing portion to come into contact with the swing portion. Swing from the first swing limit to the second swing limit. The second contact portion is provided at the second end portion of both ends of the swing portion, which is opposite to the first end portion, and the fly weight comes into contact with the fly weight in the process of retracting from a predetermined position. This causes the swing portion to swing from the second swing limit to the first swing limit.

As another example, the detection switch is a photoelectric sensor or proximity sensor that detects that the fly weight has reached a predetermined position, and the undetected state is the first state and the detected state is the second state. Is.

The governor device may further include a stop switch for stopping the car. Here, the stop switch is switched by contacting the fly weight when the rotation speed of the governor pulley reaches an abnormal overspeed larger than a predetermined overspeed.

As described above, the rotational speed of the governor pulley is accurately reflected in the position of the fly weight in the radial direction. Therefore, the position of the fly weight in the radial direction can be accurately different depending on whether the rotation speed of the governor pulley is a predetermined overspeed or an abnormal overspeed. That is, the position of the fly weight when the rotation speed of the governor pulley is a predetermined overspeed is surely inside the position of the fly weight when the rotation speed of the governor pulley is an abnormal overspeed larger than the predetermined overspeed. Then, as in the governor device, the movement of the fly weight is used to switch between the detection switch and the stop switch, so that the stop switch is switched only after the detection switch is switched by the fly weight. Is never executed by the flyweight. That is, when the rotation speed of the governor pulley is a predetermined overspeed smaller than the abnormal overspeed, the detection switch surely switches from the first state to the second state. Therefore, in the detection switch and the stop switch, there is no inconvenience that the context of the switching timing is switched.

The elevator safety system according to the present invention includes the governor device and a control device for controlling the raising and lowering operation of the car. In addition, a governor rope is connected to the car, and the governor pulley rotates in conjunction with the raising and lowering operation of the car. Then, when the detection switch is switched from the first state to the second state, the control device controls the raising / lowering operation of the car at a speed lower than the normal speed.

According to the above safety system, the rotation speed of the governor pulley is also reduced, and the rotation speed is kept away from the abnormal overspeed. Therefore, even if the vibration of the car becomes large after that, the rotation speed of the governor pulley is less likely to reach the abnormal overspeed, and as a result, the vibration of the car is prevented from being erroneously detected as an abnormality of the elevator. To.

In the above safety system, the control device may control the raising and lowering operation of the car by returning it to the normal speed after a lapse of a predetermined time from the time when the control of the car at low speed is started. According to this configuration, the car elevating motion is returned to the normal speed after a sufficient time has passed until the car vibration subsides, so that the speed is low with respect to the behavior of the same user who generated the vibration. The start and release of control in is not unnecessarily repeated.

According to the present invention, it is possible to prevent the vibration of the car caused by the behavior of the user from being erroneously detected as an abnormality of the elevator.

It is a conceptual diagram which showed the whole structure of an elevator. It is a conceptual diagram which showed the main part of the governor device. It is a conceptual diagram which showed the state of the governor device when the rotation speed of the governor pulley reached an abnormal overspeed. It is a conceptual diagram which showed the main part of the governor apparatus which concerns on 1st Embodiment. (A) (B) It is a figure which showed the movement of the detection switch with the movement of the fly weight in the radial direction. (A) (B) It is a figure which showed the movement of the detection switch with the movement of the fly weight in the direction opposite to the radial direction. (A) A perspective view showing an example of the shape of the first contact portion of the detection switch, and (B) (C) first contact at arrow Yb and Yc shown in FIG. 7 (A). It is a figure which showed the shape of each part. It is a block diagram which showed the structure of the safety system of an elevator. It is a flowchart which showed the false detection prevention control performed by a control device. It is a figure which showed the change of the rotation speed of the governor pulley, (A) when the vibration according to the behavior of the user appears in the rotation speed of the governor pulley and the rotation speed reaches an abnormal overspeed, and (B) the governor pulley. The cases where the low-speed operation control is executed by detecting that the rotation speed has reached a predetermined overspeed are shown. It is a conceptual diagram which showed the fly weight and the detection switch provided in the governor device which concerns on 1st modification. It is a conceptual diagram which showed the detection switch provided in the governor device which concerns on 2nd modification. Regarding the detection switch provided in the governor device according to the third modification, (A) a perspective view showing the first contact portion, and (B) (C) arrows Yb and Yc shown in FIG. 13 (A). It is a figure which showed the shape of each of the 1st contact part. As a fourth modification, it is a flowchart showing a modification of false detection prevention control. It is a conceptual diagram which showed the main part of the governor apparatus which concerns on 2nd Embodiment. It is a conceptual diagram which showed the main part of the governor apparatus which concerns on 3rd Embodiment.

FIG. 1 is a conceptual diagram showing the overall configuration of the elevator. The elevator includes a car K, a hoisting machine 1, a governor device 2, and a control device 3. Here, the control device 3 is, for example, a control panel that controls an elevator.

<Hoisting machine>
The hoisting machine 1 includes a sheave 11, an electric motor 12 for rotating the sheave 11, and a detection device 13. A main rope R1 is hung on the sheave 11, and a car K and a balance weight W are connected to both ends of the main rope R1. Then, the sheave 11 is rotated by the power of the electric motor 12, so that the car K moves up and down in the hoistway in a state of being balanced with the balance weight W.

The detection device 13 is a sensor (for example, an encoder) that detects the amount of rotation of the hoisting machine 1. Specifically, the detection device 13 is provided on the sheave 11 or the electric motor 12, and detects the amount of rotation of the sheave 11 or the electric motor 12 as the amount of rotation of the hoisting machine 1. Then, the control device 3 obtains the position and speed of the car K based on the rotation amount of the hoisting machine 1 detected by the detection device 13, and controls the electric motor 12 based on the obtained position and speed. Controls the ascending / descending motion of the car K.

On the other hand, when an abnormality such as slippage of the main rope R1 or failure of the detection device 13 occurs in the hoisting machine 1, the amount of rotation detected by the detection device 13 should correspond to the actual ascending / descending operation of the car K. The value deviates from. In that case, the control of the car K by the control device 3 does not correspond to the actual ascending / descending operation, and the actual speed of the car K may exceed the predetermined speed (overspeed). There is a risk). Therefore, the elevator of FIG. 1 is provided with a governor device 2 in preparation for such an abnormality of the hoisting machine 1.

<Governor device>
The governor device 2 is a device that makes an emergency stop of the car K when an abnormality occurs in the actual speed of the car K. Specifically, the governor device 2 includes a governor pulley 21 and a tension pulley 22 arranged at the upper and lower ends of the hoistway, a governor rope R2 hung on them, and an emergency stop mechanism. The governor rope R2 is connected to the car K so as to orbit as the car K moves up and down. Then, the governor pulley 21 and the tension pulley 22 rotate as the governor rope R2 orbits. That is, the governor device 2 is configured so that the governor pulley 21 and the tension pulley 22 rotate in conjunction with the raising and lowering operation of the car K.

FIG. 2 is a conceptual diagram showing a main part of the governor device 2. As shown in FIG. 2, the governor device 2 includes fly weights 23 and 24, a link 25, a return spring mechanism 26, and a stop switch 27, which constitute an emergency stop mechanism.

The fly weight 23 is parallel to the governor pulley 21 and parallel to the rotary shaft 21a at a pivotal support position Ps1 away from the rotary shaft 21a in the radial direction D1 (not shown in FIG. 2) about the rotary shaft 21a of the governor pulley 21. It is pivotally supported so that it can rotate around the central axis. Therefore, when the governor pulley 21 rotates, the fly weight 23 rotates around the rotation shaft 21a together with the governor pulley 21. Further, the fly weight 23 is provided with a center of gravity at a position away from the pivot position Ps1 so that the fly weight 23 can also rotate around the pivot position Ps1 using the centrifugal force generated by itself due to the rotation around the rotation shaft 21a. ing. Specifically, the weight of the fly weight 23 is distributed around the pivot position Ps1 so that the position away from the pivot position Ps1 is the center of gravity. In the example of FIG. 2, a relatively heavy weight portion 20W is installed at a position away from the pivotal support position Ps1. Therefore, as the fly weight 23 rotates around the rotation shaft 21a together with the governor pulley 21, the end portion of the fly weight 23 (weight portion 20W in the example of FIG. 2) is moved to the radial direction D1 by centrifugal force (that is, the governor pulley 21). Move (toward the outside of).

The fly weight 24 has the same configuration as the fly weight 23 (the shape, weight, center of gravity, etc. are the same), and is arranged 180 ° rotationally symmetrically with respect to the fly weight 23 around the rotation axis 21a. .. Then, the fly weight 24 rotates around the central axis parallel to the rotation shaft 21a on the governor pulley 21 at the pivot position Ps2 on the side opposite to the pivot position Ps1 of the fly weight 23 with respect to the rotation shaft 21a. It is pivotally supported to be possible. Here, the pivot position Ps2 is set so that the distance from the rotation shaft 21a is equal to the distance from the rotation shaft 21a to the pivot position Ps1. Therefore, when the governor pulley 21 rotates, the fly weight 24 rotates around the rotation shaft 21a together with the governor pulley 21. Further, like the fly weight 23, the fly weight 24 can also rotate around the pivot position Ps2 by utilizing the centrifugal force generated by itself due to the rotation around the rotation shaft 21a. Therefore, similarly to the fly weight 23, the fly weight 24 rotates around the rotation shaft 21a together with the governor pulley 21, so that the end portion of the fly weight 24 (weight portion 20W in the example of FIG. 2) is also centrifugally driven in the radial direction D1. (Ie, towards the outside of the governor pulley 21).

The link 25 has the fly weights 23 and 24 so that when the governor pulley 21 rotates, the amount of rotation of the fly weight 23 around the pivot position Ps1 and the amount of rotation of the fly weight 24 around the pivot position Ps2 become equal. It is a member for interlocking each rotation. Then, both ends of the link 25 are pivotally supported by the fly weights 23 and 24, respectively, so that the fly weights 23 and 24 can rotate in conjunction with each other.

The return spring mechanism 26 is connected to the fly weight 23, and defines the position (initial setting position Pf1) of the end portion (weight portion 20W in the example of FIG. 2) of the fly weight 23 when the governor pulley 21 is not rotating. At the same time, when the governor pulley 21 rotates and the end portion of the fly weight 23 moves in the radial direction D1, a force for returning the end portion to the initial set position Pf1 is applied to the fly weight 23. Then, the action of the return spring mechanism 26 on the fly weight 23 is transmitted to the fly weight 24 via the link 25. That is, when the end portion of the fly weight 23 returns to the initial setting position Pf1 by the action of the return spring mechanism 26, the end portion of the fly weight 24 also returns to the corresponding initial setting position Pf1.

The stop switch 27 is a switch that shuts off the supply of electric power to the hoisting machine 1 to stop the car K.

According to the configuration of the governor device 2, the fly weights 23 and 24 rotate around the rotation shaft 21a together with the governor pulley 21, so that the fly weights 23 and 24 have a size corresponding to the rotation speed V of the governor pulley 21. A centrifugal force is generated, and the centrifugal force causes the ends of the fly weights 23 and 24 (weight portion 20W in the example of FIG. 2) to move in the radial direction D1. At this time, the end portion moves to a position corresponding to the magnitude of the centrifugal force. Therefore, the ends of the fly weights 23 and 24 move to positions corresponding to the rotation speed V of the governor pulley 21 in the radial direction D1. Therefore, when the actual speed of the car K becomes abnormally high and the rotation speed V of the governor pulley 21 reaches the abnormal overspeed Ve, the ends of the fly weights 23 and 24 detect the abnormality corresponding to the abnormal overspeed Ve. The position Pf2 will be reached (see FIG. 3).

The stop switch 27 is arranged so that when the ends of the fly weights 23 and 24 reach the abnormality detection position Pf2, they come into contact with the ends and switch (see FIGS. 2 and 3). Therefore, when the rotation speed V of the governor pulley 21 reaches the abnormal overspeed Ve, the stop switch 27 is switched by the fly weights 23 and 24, and as a result, the power supply to the hoisting machine 1 is cut off and the car is turned on. K stops.

According to such a governor device 2, when an abnormality occurs in the speed of the car K, the abnormality can be detected as an abnormality in the rotation speed V of the governor pulley 21. Then, when an abnormality occurs in the speed of the car K and the rotation speed V of the governor pulley 21 reaches the abnormal overspeed Ve, the hoisting machine 1 is switched by switching the stop switch 27 by contact with the fly weights 23 and 24. The power supply to the car K can be cut off, thereby causing an emergency stop of the car K.

On the other hand, the behavior of the user in the car K appears as vibration in the movement of the car K, and affects the rotation speed V of the governor pulley 21 via the governor rope R2. That is, the vibration according to the behavior of the user also appears in the rotation speed V of the governor pulley 21 as shown in FIG. 10 (A). Therefore, even if there is no abnormality in the elevator, if the vibration of the car K becomes large due to, for example, a user going wild in the car K, the rotation speed V of the governor pulley 21 becomes an abnormal overspeed. It reaches Ve (see FIG. 10A), and as a result, the vibration of the car K may be erroneously detected as an elevator abnormality by the stop switch 27. Therefore, the governor device 2 according to the present invention has a configuration for preventing the vibration of the car K generated by the behavior of the user from being erroneously detected as an abnormality of the elevator. Hereinafter, embodiments of the present invention will be specifically described.

[1] First Embodiment [1-1] Governor Device FIG. 4 is a conceptual diagram showing a main part of the governor device 2 according to the first embodiment. As shown in FIG. 4, the governor device 2 further includes a detection switch 28A capable of switching between a first state and a second state. Here, the second state is a state in which the detection switch 28A detects that the rotation speed V of the governor pulley 21 is equal to or higher than the predetermined overspeed Vd. Further, the predetermined overspeed Vd is an overspeed set to a value smaller than the abnormal overspeed Ve, and is for detecting the precursory vibration (predictive vibration) in which the vibration of the car K becomes large by the detection switch 28A. is there. On the other hand, the first state is a state in which such detection is canceled. The governor device 2 is configured so that the state (first state or second state) of the detection switch 28A is electrically transmitted to the control device 3 (see FIG. 8).

Specifically, the detection switch 28A changes from the first state to the second state when the rotation speed V of the governor pulley 21 becomes a predetermined overspeed Vd and the fly weights 23 and 24 reach a predetermined position Pft in the radial direction D1. When the switching speed V of the governor pulley 21 becomes smaller than the predetermined overspeed Vd and the fly weights 23 and 24 retreat from the predetermined position Pft, the second state returns to the first state. Here, the predetermined position Pft is a position where the fly weight 23 reaches in the radial direction D1 when the rotation speed V of the governor pulley 21 reaches the predetermined overspeed Vd.

Hereinafter, the details of the detection switch 28A will be described more specifically. The fly weights 23 and 24 move to positions separated by the same distance from the rotation shaft 21a in the radial direction D1 according to the rotation speed V of the governor pulley 21, and switch the detection switch 28A with respect to the detection switch 28A. To play the same effect. Therefore, in order to simplify the description, the configuration and movement of the detection switch 28A will be described below focusing only on the movement of the fly weight 23.

5 (A) and 5 (B) are views showing the movement of the detection switch 28A accompanying the movement of the fly weight 23 in the radial direction D1 (movement in the direction of the white arrow). 6 (A) and 6 (B) are views showing the movement of the detection switch 28A with the movement of the fly weight 23 in the direction opposite to the radial direction D1 (movement in the direction of the white arrow). In each of FIGS. 5 (A) to 6 (B), the left figure is a view seen from the direction along the rotation axis 21a of the governor pulley 21, and the right figure is the arrow view Y shown in FIG. It is a figure in. Then, as shown in these figures, the detection switch 28A has a swing portion 280, a first contact portion 281 and a second contact portion 282.

The swinging portion 280 is a seesaw-shaped swinging portion, and has a pivot axis 280c that serves as a fulcrum for the swinging. The swing portion 280 is arranged so as to be able to swing in a plane parallel to the rotation shaft 21a of the governor pulley 21. Further, the swing portion 280 is arranged so as to intersect the trajectory through which the fly weight 23 rotates when viewed from the direction along the rotation shaft 21a (FIGS. 5 (A) to 6 (B)). ) Left figure).

Further, the rocking portion 280 is provided with a first regulating section 283A and a second regulating section 283B that regulate the swing within a predetermined range (see the right view of FIGS. 5A to 6B). ). In the present embodiment, each of the first regulating portion 283A and the second regulating portion 283B so that the swinging portion 280 itself does not come into contact with the fly weight 23 at any angle within the predetermined range. The position of is decided. Then, the swing portion 280 realizes the first state when the first swing limit Pg1 in which the swing is regulated by the first regulation portion 283A is reached (see the right figure of FIG. 6B), and the first state is achieved. 1 The second state is realized when the swing to the side opposite to the swing limit Pg1 reaches the second swing limit Pg2 regulated by the second regulation unit 283B (see the right figure of FIG. 5 (B)). ).

The first contact portion 281 is provided at the first end portion 280a, which is one of both ends of the swing portion 280, and when the swing portion 280 is at the first swing limit Pg1, the side surface of the first contact portion 281 is provided. It protrudes to a position where the fly weight 23 can be brought into contact with the 281a (see the right figure of FIG. 5 (A)). Then, when the fly weight 23 comes into contact with the fly weight 23 in the process of moving the fly weight 23 to the predetermined position Pft, the first contact portion 281 can convert the movement of the fly weight 23 into the swing of the swing portion 280. It is configured as follows.

Therefore, the swing portion 280 is at the first swing limit Pg1 (see the right figure in FIG. 5A), and the fly weight 23 moves to the predetermined position Pft in the process of moving the fly weight 23 to the first contact portion 281. The first contact portion 281 swings the swing portion 280 from the first swing limit Pg1 to the second swing limit Pg2 (see the right figure of FIG. 5 (B)). As a result, the detection switch 28A can be switched from the first state to the second state.

More specifically, the shape of the side surface 281a of the first contact portion 281 is devised so that the movement of the fly weight 23 can be converted into the swing of the swing portion 280 as described above. FIG. 7 (A) is a perspective view showing an example of the shape of the first contact portion 281, and FIGS. 7 (B) and 7 (C) are arrow views shown in FIG. 7 (A). It is a figure which showed the shape of the 1st contact part 281 in Yb and Yc respectively. As shown in FIG. 7A, the first contact portion 281 is a contact surface 281b with which the fly weight 23 of the side surface 281a abuts (in this embodiment, a half surface on the second contact portion 282 side). However, it has a convexally curved shape.

Specifically, as shown in FIG. 7B, the contact surface 281b has a shape in which the shape in the arrow Yb is convexly curved (inverted U-shape in FIG. 7B). Here, the convexly curved shape includes various shapes such as a semicircular shape, a semi-elliptical shape, a quadratic curve shape, a hyperbolic shape, and a mountain shape. Then, when the fly weight 23 rotating together with the governor pulley 21 comes into contact with the contact surface 281b, the contact surface 281b (convex curved surface) is placed on the side thereof (that is, with the rotation shaft 21a as the center). The fly weight 23 comes into contact with the circumferential direction D2 (see FIG. 7A) or the opposite direction. Therefore, the force received by the contact surface 281b from the fly weight 23 at the time of contact from the side tends to include a component in the direction of swinging the swinging portion 280.

Further, the contact surface 281b has a ridge line 281c of the contact surface 281b when the swing portion 280 is at the first swing limit Pg1 (see the right figure of FIG. 5 (A)) (FIGS. 7 (A) to 7 (A)). 7 (C)) is formed so as to be inclined obliquely with respect to the rotation axis 21a. In the present embodiment, the first contact portion 281 is formed in a cone shape in order to realize the shape of such a contact surface 281b. When the fly weight 23 moving in the radial direction D1 comes into contact with the contact surface 281b from the inside (second contact portion 282 side), the fly weight 23 is oblique to the ridge line 281c of the contact surface 281b. The fly weight 23 comes into contact with the fly weight 23. Therefore, the force received by the contact surface 281b from the fly weight 23 at the time of contact from the inside tends to include a component in the direction of swinging the swinging portion 280.

According to the shape of the first contact portion 281 as described above, the movement of the fly weight 23 can be efficiently converted into the swing of the swing portion 280. Therefore, when the rotation speed V of the governor pulley 21 increases and the fly weight 23 moves in the radial direction D1, the detection switch 28A is switched according to the movement of the fly weight 23 (switching from the first state to the second state). ) Is done accurately.

The second contact portion 282 is provided at the second end portion 280b on the opposite side of the first end portion 280a of both ends of the swing portion 280, and the swing portion 280 is the second swing limit Pg2. In the case of, it protrudes to a position where the fly weight 23 can be brought into contact with its own side surface 282a (see the right figure of FIG. 6 (A)). Then, when the fly weight 23 comes into contact with the fly weight 23 in the process of retreating from the predetermined position Pft toward the initial setting position Pf1, the second contact portion 282 swings the movement of the fly weight 23. It is configured so that it can be converted into 280 swings. Here, when the rotation speed V of the governor pulley 21 becomes smaller than the predetermined overspeed Vd, the fly weight 23 is initially set from the predetermined position Pft by the action (urging force) of the return spring mechanism 26 by the amount of the decrease in the centrifugal force. Retreat toward the set position Pf1.

Therefore, the swing portion 280 is at the second swing limit Pg2 (see the right figure of FIG. 6A), and the fly weight 23 moves back from the predetermined position Pft in the process of retracting the fly weight 23 from the second contact portion 282. The second contact portion 282 swings the swing portion 280 from the second swing limit Pg2 to the first swing limit Pg1 (see the right figure of FIG. 6B). As a result, the detection switch 28A can be returned from the second state to the first state.

More specifically, the shape of the side surface 282a of the second contact portion 282 is devised so that the movement of the fly weight 23 can be converted into the swing of the swing portion 280 as described above. In the present embodiment, the second contact portion 282 has the same shape as the first contact portion 281, and the contact surface 282b (in the present embodiment, the first contact portion 282b) with which the fly weight 23 of the side surface 282a abuts. The contact surface 281 side is half surface) has the same shape as the contact surface 281b of the first contact portion 281.

According to the shape of the second contact portion 282, the movement of the fly weight 23 can be efficiently converted into the swing of the swing portion 280. Therefore, when the rotation speed V of the governor pulley 21 becomes small and the fly weight 23 moves in the direction opposite to the radial direction D1, the detection switch 28A is switched according to the movement of the fly weight 23 (from the second state to the first state). Switching to the state) is performed accurately.

According to the governor device 2 of the first embodiment, the fly weight 23 moves by centrifugal force to a position (position in the radial direction D1) corresponding to the rotation speed V of the governor pulley 21 as the governor pulley 21 rotates. Therefore, the rotational speed V of the governor pulley 21 is accurately reflected in the position of the fly weight 23 in the radial direction D1. Therefore, the movement of the fly weight 23 is used to switch the detection switch 28A from the first state to the second state, so that the timing at which the detection switch 28A switches from the first state to the second state is the governor pulley. It becomes easy to match the timing at which the rotation speed V of 21 becomes the predetermined overspeed Vd with high accuracy. Therefore, by detecting the change of the detection switch 28A from the first state to the second state, it is possible to accurately detect that the rotation speed V of the governor pulley 21 has reached the predetermined overspeed Vd.

Further, when the above-mentioned movement of the fly weight 23 is also used for switching the detection switch 28A from the second state to the first state, the rotation speed V of the governor pulley 21 becomes smaller than the predetermined overspeed Vd. , The detection switch 28A can be automatically restored. Therefore, the restoration of the detection switch 28A does not require the work (recovery work) by the maintenance staff.

Further, in the governor device 2, the governor pulley 21 has a rotational speed V of a predetermined overspeed Vd (see FIG. 5B) and an abnormal overspeed Ve (see FIG. 3) in the radial direction D1. The position of the fly weight 23 can be accurately changed. That is, the position of the fly weight 23 when the rotation speed V of the governor pulley 21 is a predetermined overspeed Vd is the position of the fly weight 23 when the rotation speed V of the governor pulley 21 is an abnormal overspeed Ve larger than the predetermined overspeed Vd. It will definitely be inside. Then, as in the governor device 2 of the first embodiment, the movement of the fly weight 23 is used for switching between the detection switch 28A and the stop switch 27, so that the detection switch 28A is switched by the fly weight 23. The changeover of the stop switch 27 is not executed by the fly weight 23 until after it has been performed. That is, when the rotation speed V of the governor pulley 21 becomes a predetermined overspeed Vd smaller than the abnormal overspeed Ve, the detection switch 28A surely switches from the first state to the second state. Therefore, in the detection switch 28A and the stop switch 27, there is no inconvenience that the context of the switching timing is switched.

[1-2] Safety system FIG. 8 is a block diagram showing a configuration of an elevator safety system 100. As shown in FIG. 8, the safety system 100 is composed of a governor device 2 and a control device 3.

As described above, when the detection switch 28A of the governor device 2 is switched from the first state to the second state, it is accurate that the rotation speed V of the governor pulley 21 reaches a predetermined overspeed Vd due to the switching of the detection switch 28A. Well detected. Here, the predetermined overspeed Vd is for detecting the precursory vibration (predictive vibration) in which the vibration of the car K becomes large by the detection switch 28A, as described above. Therefore, by detecting the change of the detection switch 28A from the first state to the second state, it is possible to accurately detect the harbinger vibration (predictive vibration) in which the vibration of the car K becomes large.

Therefore, in the safety system 100 of the present embodiment, such a detection switch 28A is used to prevent the vibration of the car K caused by the behavior of the user from being erroneously detected as an elevator abnormality by the stop switch 27. To do. Specifically, the control device 3 performs the false detection prevention control described below. The false detection prevention control may be realized by hardware by constructing a circuit in the control device 3, or a program is provided in a processing device such as a CPU (Central Processing Unit) or a microcomputer included in the control device 3. It may be realized by software by executing it. Then, such a program may be stored in a portable storage medium (for example, a flash memory or the like), or may be stored in a server or the like for downloadability.

FIG. 9 is a flowchart showing false detection prevention control. False positive prevention control is started, for example, when the elevator shifts from the standby state to the operating state. When the false detection prevention control is started, the control device 3 determines whether or not the detection switch 28A has switched from the first state to the second state (step S11 in FIG. 9). Then, when the control device 3 determines in step S11 that the vehicle has switched (Yes), the control device 3 controls the raising / lowering operation of the car K at a speed lower than the normal speed through the control of the electric motor 12 (step S12 in FIG. 9). (Low speed operation control). See FIG. 10 (B)).

According to such control, the rotation speed V of the governor pulley 21 is also lowered, and the rotation speed V is kept away from the abnormal overspeed Ve (see FIG. 10B). Therefore, even if the vibration of the car K becomes large after that, the rotation speed V of the governor pulley 21 is less likely to reach the abnormal overspeed Ve, and as a result, the vibration of the car K is erroneously detected as an abnormality of the elevator. Is prevented.

Further, in step S12, the control device 3 starts measuring the elapsed time T from the time when the low-speed operation control is started. After that, the control device 3 determines whether or not the elapsed time T is equal to or longer than the predetermined time T0 (step S13 in FIG. 9). Here, the predetermined time T0 is set to a sufficient time as the time until the vibration of the car K is settled.

Then, the control device 3 repeats step S13 until it can be determined in step S13 that "elapsed (Yes)", and when it can be determined in step S13 that "elapsed (Yes)", the car K is moved up and down. The low-speed operation control is terminated by returning the operation to the normal speed and controlling it (step S14 in FIG. 9).

According to such control, the ascending / descending motion of the car K is returned to the normal speed after a sufficient time has elapsed until the vibration of the car K subsides, so that the behavior of the same user who generated the vibration can be obtained. On the other hand, the start and release of the low-speed operation control is not unnecessarily repeated.

After step S14, the control device 3 determines whether or not the false detection prevention control should be terminated (step S15 in FIG. 9). Further, the control device 3 also executes step S15 when it is determined in step S11 that "it has not been switched (No)". Then, for example, when the elevator shifts from the operating state to the standby state, the control device 3 determines in step S15 that "it should be terminated (Yes)" and terminates the false detection prevention control. On the other hand, when the control device 3 determines in step S15 that "it should not be terminated (No)", the control device 3 executes the process from step S11 again.

[1-3] Modification example <First modification example>
FIG. 11 is a conceptual diagram showing a fly weight 23 and a detection switch 28A included in the governor device 2 according to the first modification. The governor device 2 described above switches the detection switch 28A by bringing the fly weight 23 itself into contact with the first contact portion 281 and the second contact portion 282 (see FIGS. 5A to 6B). However, the present invention is not limited to this, and as shown in FIG. 11, a protrusion 29 such as a pin provided on the fly weight 23 is brought into contact with the first contact portion 281 and the second contact portion 282 for detection. The switch 28A may be switched.

<Second modification>
12 (A) and 12 (B) are conceptual diagrams showing a detection switch 28A included in the governor device 2 according to the second modification. As shown in FIGS. 12A and 12B, the detection switch 28A may further have an urging spring 284 to stabilize its state in the first or second state. ..

Specifically, the urging spring 284 is a tension spring, and one end 284a of the urging spring 284 is fixed at the same height as the pivot 280c and at a position independent of the swing portion 280, and the urging spring. The other end 284b of the 284 is connected to the swing portion 280 at a position opposite to the fixed position of the one end 284a with respect to the pivot 280c.

According to such an urging spring 284, when the oscillating portion 280 is at the midpoint of the oscillating range, the urging spring 284 is parallel to the oscillating portion 280 and overlaps the pivot 280c, and is most extended. It becomes a state. When the swing portion 280 rotates from the midpoint of the swing range to the first swing limit Pg1, the urging spring 284 shifts upward from the pivot 280c, and the swing portion 280 shifts to the first swing limit Pg1. The closer to, the smaller the elongation, and the transition to a stable state with less elastic energy (see FIG. 12 (A)). Therefore, when the swinging portion 280 rotates to the first swinging limit Pg1 side beyond the midpoint of the swinging range, the swinging portion 280 is attached to the first swinging limit Pg1 side by the urging spring 284. Be forced. On the other hand, when the swing portion 280 rotates from the midpoint of the swing range to the second swing limit Pg2 side, the urging spring 284 shifts downward from the pivot 280c, and the swing portion 280 shifts to the second swing limit Pg2. The closer to, the smaller the elongation, and the transition to a stable state with less elastic energy (see FIG. 12B). Therefore, when the swinging portion 280 rotates toward the second swinging limit Pg2 side beyond the midpoint of the swinging range, the swinging portion 280 is attached to the second swinging limit Pg2 side by the urging spring 284. Be forced.

Then, according to the detection switch 28A provided with the urging spring 284, the fly weight 23 does not have to rotate the swing portion 280 to the first swing limit Pg1 or the second swing limit Pg2, but has a swing range. The swing portion 280 is rotated to the first swing limit Pg1 or the second swing limit Pg2 by the urging force of the urging spring 284 only by rotating the swing portion 280 to a position slightly exceeding the intermediate point. That is, the switching of the detection switch 28A according to the movement of the fly weight 23 is assisted by the urging spring 284. Therefore, when the detection switch 28A is switched, the detection switch 28A can be reliably shifted to the first state or the second state.

<Third modification example>
13 (A) is a perspective view showing the first contact portion 281 of the detection switch 28A included in the governor device 2 according to the third modification, and FIGS. 13 (B) and 13 (C) are FIGS. It is a figure which showed the shape of the 1st contact part 281 in the arrow view Yb and Yc shown in 13 (A) respectively. As shown in FIGS. 13 (A) to 13 (C), the contact surface 281b of the first contact portion 281 may have a V shape composed of two planes. Further, the contact surface 282b of the second contact portion 282 may also have a V shape composed of two planes, similarly to the contact surface 281b of the first contact portion 281.

Even with the shapes of the first contact portion 281 and the second contact portion 282, the movement of the fly weight 23 can be efficiently converted into the swing of the swing portion 280. The shapes of the first contact portion 281 and the second contact portion 282 are not limited to those described above, but have been changed to various shapes capable of efficiently converting the movement of the fly weight 23 into the swing of the swing portion 280. You may.

<Fourth modification>
FIG. 14 is a flowchart showing a modified example of the false detection prevention control as a fourth modified example. As shown in FIG. 14, in step S13, the control device 3 determines whether or not the car K has stopped at the destination floor to which the car K is heading at that time, and can determine that it has stopped (Yes). In that case, the low-speed operation control may be terminated in step S14.

Here, when the car K stops on the destination floor, the vibration is settled by the user who generated the vibration in the car K getting off, or another user gets on the car. It is conceivable that the user who generated the vibration in the car K may refrain from the act of generating the vibration by paying attention to the eyes of another user. Therefore, even in the false detection prevention control of the fourth modification, the ascending / descending motion of the car K is returned to the normal speed after the vibration of the car K has subsided. Therefore, the start and release of the low-speed operation control is not unnecessarily repeated.

[2] Second Embodiment FIG. 15 is a conceptual diagram showing a main part of the governor device 2 according to the second embodiment. As shown in FIG. 15, the governor device 2 may include another detection switch 28B that switches according to the movement of the fly weights 23 and 24 instead of the detection switch 28A (FIG. 4). In the following, as in the first embodiment, the detection switch 28B will be described by focusing only on the movement of the fly weight 23 in order to simplify the description.

The detection switch 28B is a photoelectric sensor that detects that the fly weight 23 has reached a predetermined position Pft. The state in which the fly weight 23 is not detected is the first state, and the state in which the fly weight 23 is detected is the second state. Is to be. In the example of FIG. 15, the detection switch 28B is a transmissive photoelectric sensor, and includes a light emitting element 285 and a light receiving element 286. The detection switch 28B may be a reflection type photoelectric sensor.

According to the governor device 2 of the second embodiment, as in the first embodiment, the movement of the fly weight 23 is used to switch the detection switch 28B (photoelectric sensor) from the first state to the second state. , The timing at which the detection switch 28B switches from the first state to the second state can easily coincide with the timing at which the rotation speed V of the governor pulley 21 becomes the predetermined overspeed Vd. Therefore, by detecting the change of the detection switch 28B from the first state to the second state, it is possible to accurately detect that the rotation speed V of the governor pulley 21 has reached the predetermined overspeed Vd.

Further, as in the first embodiment, the movement of the fly weight 23 is also used for switching the detection switch 28B from the second state to the first state, so that the rotation speed V of the governor pulley 21 is higher than the predetermined overspeed Vd. When it becomes smaller, the detection switch 28B can be automatically restored. Therefore, the restoration of the detection switch 28B does not require the work (recovery work) by the maintenance staff.

[3] Third Embodiment FIG. 16 is a conceptual diagram showing a main part of the governor device 2 according to the third embodiment. As shown in FIG. 16, the governor device 2 may include another detection switch 28C that switches according to the movement of the fly weight 23 instead of the detection switch 28A (FIG. 4). Hereinafter, as in the first embodiment, the detection switch 28C will be described by focusing only on the movement of the fly weight 23 in order to simplify the description.

The detection switch 28C is a proximity sensor that detects that the fly weight 23 has reached a predetermined position Pft. The state in which the fly weight 23 is not detected is the first state, and the state in which the fly weight 23 is detected is the second state. Is to be.

When the fly weight 23 is made of metal, the detection switch 28C can detect the fly weight 23 itself at a predetermined position Pft. Further, regardless of whether or not the fly weight 23 is made of metal, the object to be detected by the detection switch 28C is such that the fly weight 23 is at a predetermined position Pft among the fly weights 23. It may be provided at a position close to the detection switch 28C when it arrives.

According to the governor device 2 of the third embodiment, as in the first embodiment, the movement of the fly weight 23 is used to switch the detection switch 28C (proximity sensor) from the first state to the second state. , The timing at which the detection switch 28C switches from the first state to the second state can easily coincide with the timing at which the rotation speed V of the governor pulley 21 becomes the predetermined overspeed Vd. Therefore, by detecting the change of the detection switch 28C from the first state to the second state, it is possible to accurately detect that the rotation speed V of the governor pulley 21 has reached the predetermined overspeed Vd.

Further, as in the first embodiment, the movement of the fly weight 23 is also used for switching the detection switch 28C from the second state to the first state, so that the rotation speed V of the governor pulley 21 is higher than the predetermined overspeed Vd. When it becomes smaller, the detection switch 28C can be automatically restored. Therefore, the restoration of the detection switch 28C does not require the work (recovery work) by the maintenance staff.

The description of the embodiments described above should be considered exemplary in all respects and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the claims.

1 Hoisting machine 2 Governor device 3 Control device K Riding car T Elapsed time V Rotation speed W Balance weight 11 Tie wheel 12 Electric motor 13 Detection device 20W Weight part 21 Governor pulley 21a Rotation shaft 22 Tension pulley 23, 24 Fly weight 25 Link 26 Return spring mechanism 27 Stop switch 28A, 28B, 28C Detection switch 29 Projection D1 Radial direction D2 Circumferential direction R1 Main rope R2 Governor rope T0 Predetermined time Vd Predetermined overspeed Ve Abnormal overspeed 100 Safety system 280 Swinging part 280a First end 280b 2nd end 280c Pivot 281 1st contact 282 2nd contact 281a, 282a Sides 281b, 282b Contact surface 281c Ridge 283A 1st regulation 283B 2nd regulation 284 Bounce spring 284a One end 284b Other end 285 Light emitting element 286 Light receiving element Pf1 Initial setting position Pf2 Abnormality detection position Pft Predetermined position Pg1 First swing limit Pg2 Second swing limit Ps1, Ps2 Pivot position

Claims (6)

A governor pulley that is rotated by a governor rope connected to the elevator car,
A fly weight that moves together with the governor pulley to a position corresponding to the rotation speed of the governor pulley in the radial direction centered on the rotation axis of the governor pulley.
It is possible to switch between the first state and the second state, and when the rotation speed of the governor pulley reaches a predetermined overspeed and the fly weight reaches a predetermined position in the radial direction, the first state is released. A detection switch that switches to the second state, returns from the second state to the first state when the rotation speed of the governor pulley becomes smaller than the predetermined overspeed and the fly weight retracts from the predetermined position.
Governor device. The detection switch is
It is a seesaw type swinging part, and realizes the first state when the swinging limit reaches the first swinging limit, and swinging to the side opposite to the first swinging limit is regulated. A swinging portion that realizes the second state when the second swinging limit is reached, and a swinging portion.
The swing portion is provided at the first end portion, which is one of both ends of the swing portion, and the fly weight comes into contact with the fly weight in the process of moving to the predetermined position, so that the swing portion is brought into contact with the first swing portion. A first contact portion that swings from the swing limit to the second swing limit, and
The fly weight is provided at the second end of both ends of the swinging portion on the opposite side of the first end, and the fly weight comes into contact with the fly weight in the process of retracting from the predetermined position. A second contact portion that swings the swinging portion from the second swinging limit to the first swinging limit, and
The governor device according to claim 1. The detection switch is a photoelectric sensor or proximity sensor that detects that the flyweight has reached the predetermined position, and the undetected state is defined as the first state, and the detected state is defined as the second state. The governor device according to claim 1. A stop switch for stopping the car is further provided, and the stop switch is switched by contact with the fly weight when the rotation speed of the governor pulley reaches an abnormal overspeed larger than the predetermined overspeed. The governor device according to any one of 1 to 3. The governor device according to any one of claims 1 to 4,
A control device that controls the raising and lowering operation of the car, and
With
The governor rope is connected to the car, and the governor pulley rotates in conjunction with the raising and lowering operation of the car.
The control device is an elevator safety system that controls the raising and lowering operation of the car at a speed lower than the normal speed when the detection switch is switched from the first state to the second state. The elevator safety system according to claim 5, wherein the control device controls the lifting operation of the car by returning it to the normal speed after a lapse of a predetermined time from the time when the control of the car at a low speed is started. ..

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