JP2016069094A - Elevator device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator device that can avoid a situation where excessive vibration of a lifting body by a passenger, etc. causes an overspeed switch function to operate and thus traveling of the lifting body stops unnecessarily.SOLUTION: An elevator device includes: a speed detection section for detecting traveling speed of a lifting body; a control section having an overspeed switch function for stopping operation of the lifting body when a speed signal detected by the speed detection section reaches a specified value set corresponding to an abnormal speed of the lifting body. The elevator device further includes a low-pass filter for blocking a frequency component caused by excessive vibration of the lifting body included in the speed signal detected by the speed detection section. The overspeed switch function monitors whether the speed signal in which the frequency component caused by the excessive vibration of the lifting body is blocked reaches the specified value.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an elevator apparatus.

  Elevator equipment generally monitors the traveling speed (moving speed / elevating speed) and traveling position of a lifting body, which is generally called a car, and makes the lifting body emergency when the lifting body falls into a predetermined abnormal state. A safety device to stop is provided. In recent years, as a safety device, the traveling position and traveling speed of the lifting body are electrically detected (measured) using a speed sensor, and a command signal for shifting the elevator device to a safe state based on the detection result is provided. The introduction of electronic safety systems using safety controllers that output is progressing.

As techniques of this electronic safety system, techniques described in Patent Documents 1 and 2 are known. Patent Document 1 describes that "the electronic safety controller detects an abnormality of the elevator and outputs a command signal for shifting the elevator to a safe state."
Patent Document 2 describes that "the controller transmits a control signal to the elevator control device and the driving / braking device to stop the elevator car in a safe manner."

International Publication No. 2006/106575 Japanese translation of PCT publication No. 2002-538061

  By the way, the electronic safety system has an overspeed switch function that stops driving of the lifting body when the traveling speed of the lifting body reaches an abnormal speed. In this electronic safety system with an overspeed switch function, the overspeed switch function is caused by excessive vibration of the lifting body (hereinafter sometimes referred to as “overvibration”) caused by passengers in the lifting body during traveling of the lifting body. Operates, and there is a possibility that the elevator apparatus is unnecessarily stopped (travel of the lifting body is stopped).

  The technology described in Patent Documents 1 and 2 considers measures against the excessive speed switch function that is caused by excessive vibration of the lifting body by such passengers and the traveling of the lifting body unnecessarily. Not.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator apparatus that can prevent an overspeed switch function from operating due to excessive vibration of an elevating body caused by a passenger or the like, and preventing the elevating body from traveling unnecessarily. .

In order to solve the above problems, for example, the configuration described in the claims is adopted.
The present application includes a plurality of means for solving the above problems.
A speed detector for detecting the traveling speed of the elevator,
A control unit having an overspeed switch function to stop driving of the lifting body when the speed signal detected by the speed detection unit reaches a specified value set corresponding to the abnormal speed of the lifting body;
An elevator device comprising:
A low-pass filter that cuts off a frequency component caused by excessive vibration of the lifting body included in the speed signal detected by the speed detector;
The overspeed switch function is characterized by monitoring whether or not the speed signal in which the frequency component due to excessive vibration of the lifting body is cut off has reached a specified value.

According to the present invention, even if excessive vibration of the lifting body due to passengers in the lifting body occurs during traveling of the lifting body, the overspeed switch function does not operate, so unnecessary stopping of the lifting body is stopped. It can be avoided.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is an example of a side sectional view showing a schematic configuration of configuration example 1 of an elevator apparatus to which the present invention is applied. It is an example of the sectional side view which shows schematic structure of the structural example 2 of the elevator apparatus with which this invention is applied. It is an example of the sectional side view which shows schematic structure of the structural example 3 of the elevator apparatus with which this invention is applied. It is an example of the sectional side view which shows schematic structure of the structural example 4 of the elevator apparatus with which this invention is applied. It is an example of a block diagram showing an outline of a system configuration of a control system of an elevator apparatus to which the present invention is applied. It is an example of the characteristic figure which shows the frequency characteristic of a low-pass filter.

  Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings. The present invention is not limited to the embodiment. In the present specification and drawings, the same components or components having substantially the same function are denoted by the same reference numerals, and redundant description is omitted.

<Elevator apparatus according to an embodiment of the present invention>
The elevator apparatus according to the embodiment of the present invention introduces an electronic safety system using an electronic safety controller 200 (see FIG. 5) described later. In addition, an elevator traveling speed, more specifically, a speed detecting unit that detects a traveling speed (moving speed / lifting speed) of a lifting body called a car is provided. The speed detection unit uses a speed sensor that electrically measures the traveling speed to detect the traveling speed of the lifting body.

  The elevator apparatus according to the present embodiment is a rotary sensor that is attached to, for example, a rotating body that rotates in conjunction with the traveling of the lifting body as a speed sensor, and converts a mechanical displacement amount in the rotation direction of the rotating body into a digital amount. A configuration using an encoder is employed. The rotating body to which the rotary encoder is attached varies depending on the configuration (type) of the elevator apparatus. There are various types of elevator apparatuses.

  Before describing the elevator apparatus according to the present embodiment, a specific configuration example of the elevator apparatus to which the present invention is applied will be described below.

[Configuration example 1]
FIG. 1 is an example of a side sectional view showing a schematic configuration of a configuration example 1 of an elevator apparatus to which the present invention is applied.

  In general, an elevator apparatus connects a lifting body (cage) 103 and a counterweight 104 to a hoistway 102 provided in a building 100 by a main rope (main rope) 105, and the lifting body 103 is not shown. It is configured to be able to move up and down along the guide rail. A machine room 101 is provided above the hoistway 102.

  In the machine room 101, a hoisting machine 106 around which a main rope 105 is wound, a control panel 107 for controlling the hoisting machine 106, a speed governor 110, and the like are arranged. The speed governor 110 includes an endless speed regulating rope 111 that is stretched over the entire travel stroke (lifting stroke) of the lifting body 103 in the hoistway 102. The governing rope 111 is wound around a sheave 112 installed in the machine room 101 and a sheave 113 of a governor weight installed at the lower part of the hoistway 102. The sheave 112 is rotatably attached to the building 100.

  The lifting body 103 is provided with an emergency stop device 108 that holds a guide rail (not shown) with a wedge in an emergency and stops the traveling of the lifting body 103, and an operating lever 109 that drives the emergency stop device 108. The operation lever 109 is pivotally supported on the lifting body 103 side and is provided in contact with the speed control rope 111.

  The sheave 112 of the governor 110 is a rotating body that rotates in conjunction with the traveling of the elevating body 103. A rotary encoder 120 that is an example of a speed sensor that electrically measures the traveling speed of the elevating body 103 is attached to the sheave 112. The rotary encoder 120 converts a mechanical displacement amount in the rotational direction of the sheave 112 into a digital amount. The output signal of the rotary encoder 120 is supplied to an electronic safety controller 200 (see FIG. 5), which will be described later, which is a control unit provided in the control panel 107.

  In the elevator apparatus according to Configuration Example 1, the rotary encoder 120 is attached to the sheave 112. However, the present invention is not limited to this. Similar to the sheave 112, the rotary encoder 120 may be attached to the sheave 113 of the governor weight that is a rotating body that rotates in conjunction with the traveling of the elevating body 103. However, attaching the rotary encoder 120 to the sheave 112 can shorten the wiring for transmitting the signal of the rotary encoder 120 to the control panel 107 rather than attaching the rotary encoder 120 to the sheave 113, which is advantageous in suppressing the influence of noise on the wiring. It is.

[Configuration example 2]
FIG. 2 is an example of a side sectional view showing a schematic configuration of configuration example 2 of an elevator apparatus to which the present invention is applied.

  As is clear from FIG. 2, the elevator apparatus according to the configuration example 2 does not include the machine room 101 in the elevator apparatus according to the configuration example 1, and the hoistway 102 includes the hoisting machine 106, the control panel 107, and the speed governor 110. It has a configuration arranged inside. Specifically, a so-called lower arrangement structure in which the hoisting machine 106 and the control panel 107 are arranged in the lower part of the hoistway 102 is employed.

  A sheave 131 and a sheave 132 are rotatably attached to the elevating body 103 and the counterweight 104. In addition, two sheaves 133 and 134 are provided in the upper part of the hoistway 102. The sheaves 133 and 134 are rotatably attached to the building 100. The main rope 105 is wound around a sheave 131, a sheave 133, a hoisting machine 106, a sheave 134 and a sheave 132, and both ends are fixed to the upper part of the hoistway 102.

  As described above, the elevator apparatus according to Configuration Example 2 employs a lower arrangement structure for the hoisting machine 106 and the control panel 107. In the case of adopting this lower arrangement structure, it is desirable to attach the rotary encoder 120 for measuring the traveling speed of the elevating body 103 to the governor weight 113. Thereby, since the wiring which transmits the signal of the rotary encoder 120 to the control panel 107 can be made shorter than the case where the rotary encoder 120 is attached to the sheave 112, it is advantageous in suppressing the influence of noise on the wiring. However, the rotary encoder 120 may be attached to the sheave 112.

[Configuration example 3]
FIG. 3 is an example of a side sectional view showing a schematic configuration of configuration example 3 of an elevator apparatus to which the present invention is applied.

  In the elevator apparatus according to Configuration Example 1 and the elevator apparatus according to Configuration Example 2, the rotary encoder 120 that measures the traveling speed of the lifting body 103 is a sheave 112 that is a rotating body that rotates in conjunction with the traveling of the lifting body 103. The structure attached to the sheave 113 of the governor weight is adopted.

  On the other hand, the elevator apparatus according to Configuration Example 3 employs a configuration in which the rotary encoder 120 is attached to the lifting body 103. Further, the roller 135 of the rotary encoder 120 is pressed against the guide rail 136. The output signal (encoder signal) of the rotary encoder 120 is transmitted to the control panel 107 by the tail code 137.

  In the elevator apparatus according to Configuration Example 3 having the above-described configuration, the roller 135 rotates as the elevating body 103 travels (moves / elevates), and the rotary encoder 120 moves in the travel direction (movement direction) of the elevating body 103 accordingly. The mechanical displacement is converted into a digital quantity. In this case, the attachment target of the rotary encoder 120 is not a rotating body that rotates in conjunction with the traveling of the lifting body 103 but a moving body that moves in conjunction with the traveling of the lifting body 103 (that is, the lifting body 103). Become.

[Configuration Example 4]
FIG. 4 is an example of a side sectional view showing a schematic configuration of a configuration example 4 of an elevator apparatus to which the present invention is applied.

  As shown in FIG. 4, in the elevator apparatus according to Configuration Example 4, in addition to the configuration of the elevator apparatus according to Configuration Example 1, a sheave 141 is disposed in the machine room 101, and a sheave 142 is disposed below the hoistway 102. The endless rope 143 is wound around these sheaves 141 and 142. That is, the endless rope 143 is stretched over the entire area in the hoistway 102. The endless rope 143 is connected to a lever 144 supported by the elevating body 103.

  In the elevator apparatus according to Configuration Example 4 having the above-described configuration, the endless rope 143 rotates in conjunction with the travel of the hoistway 102, and the sheaves 141 and 142 rotate accordingly. That is, the sheaves 141 and 142 are rotating bodies that rotate in conjunction with the traveling of the lifting body 103. In the elevator apparatus according to Configuration Example 4, the rotary encoder 120 is attached to the sheave 141.

  In addition, in the elevator apparatus which concerns on this structural example 4, although it was set as the structure which attaches the rotary encoder 120 to the sheave 141, it is not restricted to this. Similar to the sheave 141, the rotary encoder 120 may be attached to the sheave 142 that is a rotating body that rotates in conjunction with the traveling of the elevating body 103. However, attaching the rotary encoder 120 to the sheave 141 can shorten the wiring for transmitting the signal of the rotary encoder 120 to the control panel 107 as compared to attaching the rotary encoder 120 to the sheave 142, which is advantageous in suppressing the influence of noise and the like on the wiring. It is.

<System configuration of control system>
Next, the system configuration of the control system of the elevator apparatus to which the present invention is applied will be described. FIG. 5 is an example of a block diagram showing an outline of a system configuration of a control system of an elevator apparatus to which the present invention is applied.

  As shown in FIG. 5, the present control system is configured around an electronic safety controller 200 that is a control unit responsible for overall control of the elevator apparatus to which the present invention is applied. The electronic safety controller 200 receives an output signal (encoder signal) of the rotary encoder 120, a position detection signal of the position detection unit 150, and a detection signal of the switch unit 160.

  The rotary encoder 120 is an example of a speed sensor that electrically measures the traveling speed of the elevating body 103, and outputs an encoder signal including information on the traveling speed and the traveling position of the elevating body 103. The position detection unit 150 is a sensor that detects an absolute travel position of the elevating body 103. For example, the position detection unit 150 is attached to the lifting plate 103 side with a shielding plate installed corresponding to each floor on the hoistway 102 side, and the position of the lifting body 103 is determined by blocking the optical path by the shielding plate. It consists of a combination with an optical sensor to detect. The switch unit 160 includes various switches provided at predetermined locations in the elevator apparatus.

  In FIG. 5, regarding the electronic safety controller 200, each function of the electronic safety controller 200 is illustrated as a block diagram and illustrated as a functional block diagram. The electronic safety controller 200 includes a position information calculation unit 201, a speed information calculation unit 202, a low-pass filter processing unit 203, various switch inspection function units 204, a limit switch function unit 205, and a terminal floor forced deceleration function unit 206. The electronic safety controller 200 further includes an overspeed switch function unit 207, a door floor travel protection function unit 208, a rationality detection function unit 209, and a stop output function unit 210.

  The position information calculation unit 201 calculates the position information of the lifting body 103 based on the encoder signal of the rotary encoder 120 and the position detection signal of the position detection unit 150, and outputs the position information as the position signal of the lifting body 103. This position signal is supplied to the limit switch function unit 205, the terminal floor forced deceleration function unit 206, and the door floor travel protection function unit 208.

  The speed information calculation unit 202 calculates speed information of the lifting body 103 based on the encoder signal of the rotary encoder 120 and outputs it as a speed signal of the lifting body 103. This speed signal is supplied to the low-pass filter processing unit 203 and the terminal floor forced deceleration function unit 206. Here, the speed information calculation unit 202 and the rotary encoder 120 constitute a speed detection unit that detects an elevator traveling speed, more specifically, a traveling speed (moving speed / lifting speed) of the lifting body 103.

  Here, when excessive vibration (excessive vibration) of the lifting / lowering body 103 caused by passengers in the lifting / lowering body 103 occurs during traveling of the lifting / lowering body 103, the frequency component resulting from the excessive vibration becomes a speed signal of the lifting / lowering body 103. It is included and output from the speed information calculation unit 202. The low-pass filter processing unit 203 blocks a frequency component caused by excessive vibration of the elevating body 103 included in the speed signal.

  The various switch inspection function unit 204 detects whether or not these switches are functioning normally, based on information from various switches provided at predetermined locations in the elevator apparatus. Then, when the various switches are functioning normally, the various switch inspection function units 204 send the detection signals of these switches to the limit switch function unit 205, the terminal floor forced deceleration function unit 206, the overspeed switch function unit 207, and It supplies to the floor driving protection function part 208.

  The limit switch function unit 205 monitors the traveling position of the lifting body 103 based on the position signal supplied from the position information calculation unit 201 and the detection signals of the various switches supplied from the various switch inspection function unit 204. The limit switch function unit 205 moves up and down before the top or bottom of the lifting body 103 collides with the top or bottom of the hoistway 102 when the lifting body 103 passes over the terminal floor (top floor / bottom floor). A command signal for stopping the traveling of the body 103 is output.

  The terminal floor forced deceleration function unit 206 is based on the position signal supplied from the position information calculation unit 201, the speed signal supplied from the speed information calculation unit 202, and the detection signals of various switches supplied from the various switch inspection function unit 204. Thus, deceleration control is performed on the moving elevator 103. Specifically, the terminal floor forced deceleration function unit 206 outputs a command signal for forcibly decelerating the traveling speed of the elevator body 103 when the elevator body 103 approaches the terminal floor.

  The overspeed switch function unit 207 monitors the speed signal supplied from the speed information calculation unit 202 via the low-pass filter processing unit 203 and the detection signals of various switches supplied from the various switch inspection function unit 204. The speed signal is input to the overspeed switch function unit 207 after the frequency component resulting from the excessive vibration of the elevating body 103 is blocked by the low pass filter processing unit 203. When the speed signal reaches a specified value (threshold value) set corresponding to the abnormal speed of the lifting body 103, that is, when the traveling speed of the lifting body 103 reaches the abnormal speed, the overspeed switch function unit 207 A command signal for stopping the driving of the lifting / lowering body 103 is output.

  Based on the position signal supplied from the position information calculation unit 201 and the detection signals of the various switches supplied from the various switch inspection function units 204, the door floor traveling protection function unit 208 can When the movement is detected, a command signal for stopping the traveling of the elevating body 103 is output. The rationality detection function unit 209 performs processing of each function unit based on output signals of the limit switch function unit 205, the terminal floor forced deceleration function unit 206, the overspeed switch function unit 207, and the door floor travel protection function unit 208. Check the rationality for any abnormalities.

  The stop output function unit 210 includes output signals from the limit switch function unit 205, the terminal floor forced deceleration function unit 206, the overspeed switch function unit 207, and the door floor travel protection function unit 208, and the output from the rationality detection function unit 209. Input signal. The stop output function unit 210 outputs a stop signal for stopping the operation of the elevator device to the control panel 107 when it is determined that the elevator device is in an abnormal state based on these output signals.

  For example, when the overspeed switch function unit 207 detects that the traveling speed of the elevating body 103 has reached an abnormal speed and outputs a command signal for stopping the driving of the elevating body 103, the stop output function unit 210 In response to this command signal, a stop signal is output to the control panel 107. In response to this stop signal, the control panel 107 performs control to stop driving of the lifting body 103 by shutting off the power supply of the driving device (winding machine 106) and the braking device of the lifting body 103.

  The functional units 201 to 210 of the electronic safety controller 200 described above can be realized by software by interpreting and executing a program that realizes each function by the processor. At this time, information such as programs, tables, and files for realizing each function is recorded on a recording device such as a memory, a hard disk, and an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, and a DVD. be able to. Moreover, about each said function parts 201-210 etc., those one part or all part can also be implement | achieved by hardware, for example by designing with an integrated circuit.

  As described above, the elevator apparatus according to the present embodiment includes the speed detection unit that detects the elevator traveling speed, more specifically, the traveling speed of the elevating body 103. This speed detection unit calculates the speed information of the lifting body 103 based on the rotary encoder 120 that electrically measures the traveling speed of the lifting body 103 and the encoder signal of the rotary encoder 120, and outputs the speed information as a speed signal. Part 202.

  Further, the elevator apparatus according to the present embodiment includes an overspeed switch function unit 207 as one of the functions of the electronic safety controller 200 that is a control unit. The overspeed switch function unit 207 is supplied with a speed signal from the speed information calculation unit 202 via the low pass filter processing unit 203. The overspeed switch function unit 207 determines that when the input speed signal reaches a specified value (threshold value) set corresponding to the abnormal speed of the lifting body 103, that is, the traveling speed of the lifting body 103 reaches the abnormal speed. Sometimes, a command signal for stopping the driving of the lifting body 103 is output. In response to this command signal, the control panel 107 stops driving of the lifting body 103 by shutting off the power supply of the driving device and the braking device of the lifting body 103.

  Here, for example, when excessive vibration is generated by the passenger in the lifting / lowering body 103, the frequency component resulting from the vibration is included (superimposed) in the speed signal of the lifting / lowering body 103 output from the speed information calculation unit 202. ) When the speed signal reaches a specified value due to the frequency component caused by excessive vibration, the overspeed switch function unit 207 operates even though the elevator apparatus is not abnormal, and the elevator apparatus is unnecessarily turned off. There is a possibility of stopping (ie, stopping the traveling of the elevating body 103).

  In order to avoid such an unnecessary stop of the elevator apparatus due to excessive vibration by the passenger, the elevator apparatus according to the present embodiment has a low-pass filter processing unit 203 as one of the functions of the electronic safety controller 200. doing. The low-pass filter processing unit 203 is also a low-pass filter that blocks a frequency component caused by excessive vibration included in the speed signal of the lifting body 103. The low-pass filter processing unit 203 performs a filtering process for blocking the frequency component caused by excessive vibration on the speed signal of the lifting body 103, thereby eliminating unnecessary elevator equipment caused by excessive vibration by the passenger. Stops can be avoided.

  Here, it can be said that when excessive vibration is applied by the passenger, the lifting body 103 swings at the natural frequency of the lifting body 103 including the rope system such as the main rope 105. Therefore, it is important that the cutoff characteristic of the low-pass filter (low-pass filter processing unit 203) includes the natural frequency of the lifting body 103 including the rope system. However, since the length of the main rope 105 (for example, the length to the hoisting machine 106 in the configuration example 1 in FIG. 1) varies depending on the position of the lifting body 103, the natural frequency of the lifting body 103 is changed. Also changes depending on the position of the lifting body 103.

  Therefore, it is desirable to set the minimum value of the natural frequency of the lifting body 103 applied to the cutoff characteristic of the low-pass filter as the cutoff characteristic of the low-pass filter. The minimum value of the natural frequency of the lifting / lowering body 103 is the natural frequency when the length of the main rope 105 is the longest, that is, the lifting / lowering body 103 is located at the bottom (for example, the lowest floor) of the travel stroke. This is the natural frequency of the time.

An example of a method for calculating the natural frequency fn of the lifting body 103 is shown in the following calculation formula (1).
fn = (1 / 2π) (k / m) ^1/2 (1)
Here, the weight of the rope system connected to the lifting body 103, the length, the rigidity, the number, the composite spring constant such as a thimble rod, m is a mass including the maximum loading capacity of the lifting body 103. Since the mass of the elevating body 103 varies depending on the number of passengers and the like, the mass includes the maximum load capacity.

  FIG. 6 is an example of a characteristic diagram showing the frequency characteristic (cutoff characteristic) of the low-pass filter. By setting the natural frequency fn of the lifting body 103 calculated using the above calculation formula (1) as the cut-off frequency of the frequency characteristic of the low-pass filter, the lifting body 103 is caused by excessive vibration by the passenger. It is possible to reliably block the frequency component included (ride) in the speed signal. Thereby, the stop of the unnecessary elevator apparatus resulting from the excessive vibration by a passenger can be avoided reliably.

  By the way, the electronic safety controller 200 is configured to use the speed signal of the elevating body 103 output from the speed information calculation unit 202 even for functions other than the overspeed switch function. Specifically, the speed signal of the elevating body 103 is used not only by the overspeed switch function unit 207 but also by the terminal floor forced deceleration function unit 206. Here, it is important that the low-pass filter (low-pass filter processing unit 203) performs the filtering process only on the speed signal used in the overspeed switch function (overspeed switch function unit 207).

  Specifically, the filtering process is performed only on the speed signal input from the speed information calculation unit 202 to the overspeed switch function unit 207, and the speed output from the speed information calculation unit 202 for other function units. The signal waveform is used as it is. In the case of this example, the function units other than the overspeed switch function unit 207 using the speed signal are the terminal floor forced deceleration function unit 206. The terminal floor forced deceleration function unit 206 receives the position signal output from the position information calculation unit 201 and the speed signal output from the speed information calculation unit 202.

  Here, if the filtering process is performed on the speed signal input from the speed information calculation unit 202, a delay occurs in the speed signal. As a result, a difference occurs in the input timing between the position signal and the speed signal that need to be input to the terminal floor forced deceleration function unit 206 at the same timing, which hinders the processing of the terminal floor forced deceleration function unit 206. Occurs. From this point of view, it is important that only the speed signal used in the overspeed switch function (overspeed switch function unit 207) is subjected to filtering processing, and the speed signal used for other functions is not subjected to filtering processing. It becomes.

  In addition, this invention is not limited to above-described embodiment, Various modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations.

DESCRIPTION OF SYMBOLS 100 Building 101 Machine room 102 Hoistway 103 Lifting body 104 Counterweight 105 Main rope (main rope)
106 Hoisting machine 107 Control panel 108 Emergency stop device 109 Actuating lever 110 Speed governor 111 Speed governing rope 112, 131 to 134, 141, 142 Sheave 113 Shedding wheel for speed governor weight 120 Rotary encoder 135 Roller of rotary encoder 136 Guide rail 137 Tail cord 143 Endless rope 150 Position detection unit 160 Switch unit 200 Electronic safety controller 201 Position information calculation unit 202 Speed information calculation unit 203 Low-pass filter processing unit 204 Various switch inspection function unit 205 Limit switch function unit 206 Termination Floor forced deceleration function unit 207 Overspeed switch function unit 208 Door floor travel protection function unit 209 Rationality detection function unit 210 Stop output function unit

Claims (4)

A speed detector for detecting the traveling speed of the elevator,
A control unit having an overspeed switch function to stop driving the elevating body when the speed signal detected by the speed detecting unit reaches a specified value set corresponding to the abnormal speed of the elevating body;
An elevator device comprising:
A low-pass filter that cuts off a frequency component caused by excessive vibration of the elevating body included in the speed signal;
The overspeed switch function monitors whether or not the speed signal in which a frequency component caused by excessive vibration of the lifting body is blocked by the low-pass filter has reached the specified value. . Even if the control unit uses the speed signal in a function other than the overspeed switch function,
The elevator apparatus according to claim 1, wherein the low-pass filter performs a filtering process only on the speed signal used in the overspeed switch function. The elevator apparatus according to claim 1 or 2, wherein the cutoff characteristic of the low-pass filter includes a natural frequency of the lifting body including a main rope attached to the lifting body. The natural frequency of the lifting body is obtained from a composite spring constant including the weight, length, rigidity and number of rope systems connected to the lifting body, and a mass including the maximum load capacity of the lifting body. The elevator apparatus according to claim 3.

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