JP2017222461A - Elevator car position detection device having self diagnostic function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To acquire an elevator car position detection device having a self diagnostic function, which has high installation workability and can perform self diagnosis of a sensor used for an elevator car position detection simultaneously when detecting the elevator car position.SOLUTION: An elevator car position detection device having a self diagnostic function, includes: a plurality of sensors which are provided in a hoistway, the sensors constituted by three or more light projecting/receiving parts arranged in parallel in which a light projecting part and a light receiving part opposing to each other are paired up respectively; a shielding plate which is provided at the car and shields light from the light projecting part by passing between the light projecting part and the light receiving part, and in which a plurality of holes are formed so that three or more light receiving parts receive the light from the opposing projecting parts sequentially; and a control part which detects the position of the car by detecting which sensor the shielding plate has passed, and which performs self diagnosis of the sensor based on the light receiving state of the light receiving part in the sensor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an elevator car position detection device having a self-diagnosis function that detects a car position of an elevator and performs self-diagnosis of a sensor used for car position detection.

  Conventionally, a plurality of sensors are provided on the upper and lower sides of the car, with a pair of light projecting means and light receiving means facing each other, and pass between the light projecting means and the light receiving means at a predetermined position in the hoistway. The position of the car is detected by configuring the shielding plate so that an output signal can be output in binary number when the shielding plate passes between a plurality of pairs of light projecting means and light receiving means. An elevator position detection device is known (for example, see Patent Document 1).

JP 2000-34070 A

  However, the elevator position detection apparatus disclosed in Patent Document 1 requires a long shielding plate, which causes a problem that installation workability is lowered. Patent Document 1 discloses a configuration in which a short shielding plate is used and the output signal is held when the sensor passes the shielding plate for a predetermined time or more. However, the signal is missed when the car is overspeeded. There is also the problem of fear.

  Further, the elevator position detection device of Patent Document 1 is vulnerable to sensor failure, and there is a problem that an incorrect car position is detected only when one of the plurality of sensors fails.

  The present invention has been made to solve the above-described problems, has high installation workability, and can simultaneously perform self-diagnosis of sensors used for car position detection when detecting the car position of an elevator. An object of the present invention is to provide an elevator car position detection device having a self-diagnosis function.

  An elevator car position detecting device having a self-diagnosis function according to the present invention is a sensor provided in a plurality of hoistways, and a light projecting / receiving unit having a light projecting unit and a light receiving unit facing each other as a pair. A shielding plate that is provided in a cage that includes three or more sensors arranged in parallel and that blocks light from the light projecting unit by passing between the light projecting unit and the light receiving unit. The position of the car is determined by determining a shielding plate in which a plurality of holes are formed so that light from the light projecting portions opposed to one or more light receiving portions is received in order and which sensor the shielding plate has passed through. And a control unit that performs self-diagnosis of the sensor based on the light receiving state of the light receiving unit in the sensor.

According to the elevator car position detecting apparatus having a self-diagnosis function according to the present invention, a plurality of sensors are provided in the hoistway, and a light projecting / receiving unit having a light projecting unit and a light receiving unit facing each other is provided. Three or more are arranged in parallel, the shielding plate is provided in the cage, and a plurality of holes are formed so as to sequentially receive light from the light projecting units opposed to the three or more light receiving units, The light from the light projecting unit is blocked by passing between the light projecting unit and the light receiving unit, and the control unit detects the position of the car by determining which sensor the shielding plate has passed. At the same time, the sensor performs self-diagnosis based on the light receiving state of the light receiving unit in the sensor.
Therefore, it is possible to obtain an elevator car position detection device having a self-diagnosis function, which has high installation workability and can simultaneously perform self-diagnosis of sensors used for car position detection when detecting the car position of the elevator. .

1 is an overall configuration diagram illustrating an elevator to which an elevator car position detection device having a self-diagnosis function according to Embodiment 1 of the present invention is applied. It is a block diagram which expands and shows the sensor of the elevator car position detection apparatus which has a self-diagnosis function which concerns on Embodiment 1 of this invention. It is a block diagram which expands and shows the plate of the elevator car position detection apparatus which has a self-diagnosis function which concerns on Embodiment 1 of this invention. It is a block diagram which shows the internal circuit of the sensor in the elevator car position detection apparatus which has a self-diagnosis function which concerns on Embodiment 1 of this invention. It is a block diagram which shows the connection relation of the sensor in the elevator car position detection apparatus which has a self-diagnosis function which concerns on Embodiment 1 of this invention. It is a block diagram which shows the elevator car position detection apparatus which has a self-diagnosis function which concerns on Embodiment 2 of this invention. It is a block diagram which shows the safety circuit in the elevator car position detection apparatus which has a self-diagnosis function which concerns on Embodiment 3 of this invention.

  Hereinafter, preferred embodiments of an elevator car position detection device having a self-diagnosis function according to the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals. explain.

Embodiment 1 FIG.
FIG. 1 is an overall configuration diagram showing an elevator to which an elevator car position detection apparatus having a self-diagnosis function according to Embodiment 1 of the present invention is applied. In FIG. 1, a car 2 and a counterweight 3 are provided in a hoistway 1 so as to be movable in the vertical direction, and the car 2 is landed on a landing 4 on each floor.

  In the upper part of the hoistway 1, a hoisting machine 5 that generates a driving force for moving the car 2 and the counterweight 3, and a deflecting wheel 6 disposed in the vicinity of the hoisting machine 5 are provided. A main rope 7 is wound around the hoisting machine 5 and the deflecting wheel 6, and a car 2 and a counterweight 3 are suspended from both ends of the main rope 7.

  The hoistway 1 is provided with a plurality of sensors 8 for detecting the car position, and the car 2 is provided with a plate 9 that is used for the sensor 8 and is a shielding plate for blocking light. A signal from the sensor 8 is input to the control panel 11 that controls the drive of the elevator via the electric wire 10.

  FIG. 2 is an enlarged configuration diagram showing a sensor of the elevator car position detection device having a self-diagnosis function according to Embodiment 1 of the present invention. In FIG. 2, the sensor 8 is configured by arranging three or more light projecting / receiving sections in parallel, each paired with an LED 81 that is a light projecting section and a light receiving element 82 that is a light receiving section. In the first embodiment of the present invention, a case where four light projecting / receiving units are arranged will be described as an example.

  FIG. 3 is an enlarged configuration diagram showing a plate of the elevator car position detecting device having a self-diagnosis function according to Embodiment 1 of the present invention. In FIG. 3, the plate 9 is a shielding plate that blocks light from the LED 81 by passing between the LED 81 and the light receiving element 82 of the sensor 8, and the four light receiving elements 82 are separated from the facing LED 81. A plurality of square holes 91 to 94 are formed so as to receive light in order.

  FIG. 4 is a block diagram showing an internal circuit of a sensor in the elevator car position detecting apparatus having a self-diagnosis function according to Embodiment 1 of the present invention. In FIG. 4, power is supplied to the LEDs 81 of the sensor 8 from the power supply 12, and signals detected by the light receiving elements 82 are output to the control panel 11.

  FIG. 5 is a block diagram showing the connection relationship of the sensors in the elevator car position detection device having a self-diagnosis function according to Embodiment 1 of the present invention. In FIG. 5, power is supplied to a plurality of sensors 8 from a power source 12, and signals from the sensors 8 are all output to an elevator control CPU 13 mounted inside the control panel 11. Hereinafter, the elevator control CPU 13 is referred to as an elevator control CPU 13.

  Here, the elevator car position detection device having the self-diagnosis function according to Embodiment 1 of the present invention detects the car position by passing the plate 9 through a plurality of sensors 8 provided in the hoistway 1. This is a car position detection device with a simple configuration. Further, the lower end of the car 2 is provided with a plate 9 provided with square holes 91 to 94 having the same shape in order from the upper left as shown in FIG.

  On the other hand, on the side of the hoistway 1, the U-shaped sensor 8 incorporating the four light projecting and receiving portions shown in FIG. 2 is located at two positions at the upper end of the hoistway 1 and at any position at the lower end. Are provided in two places. Further, when the plate 9 passes through the concave portion inside the U-shape of the sensor 8, the four light receiving elements 82 sequentially receive the light from the facing LEDs 81 by the square holes 91 to 94. Thus, the position of the car 2 is detected and the soundness of the light projecting / receiving unit of the sensor 8 is also confirmed.

  That is, the electronic control CPU 13 determines which sensor 8 the plate 9 has passed, thereby detecting the position of the car 2 and performing self-diagnosis of the sensor based on the light receiving state of the light receiving element 82 in the sensor 8. Do.

  Hereinafter, in the elevator car position detecting apparatus having the self-diagnosis function having the above-described configuration, for example, a state transition in which the car 1 is raised and the plate 9 passes the sensor 8 will be described. First, as shown in FIG. 4, the sensor 8 is normally lit by the power supplied from the power source 12 and the light receiving element 82 receives light from the LED 81. Before the signal passes, all signals detected by the light receiving element 82 are turned on and output to the control panel 5.

  At this time, the power supply line for supplying power to the sensor 8 and the signal line for transmitting a signal from the sensor 8 are respectively connected to the power supply 12 and the electronic control CPU 13 as parallel lines as shown in FIG. The elevator control CPU 13 is a control unit that is mounted inside the control panel 11 and executes control of the elevator.

  Next, when the plate 9 enters the sensor 8, all the light from the LEDs 81 corresponding to the square holes 91 to 94 of the plate 9 is interrupted for a moment, and when the square hole 91 passes, the LED 81 at the left end of FIG. Only the signal of is turned on. Hereinafter, the leftmost LED 81 is referred to as a first LED, and the signal of the first LED is referred to as a signal D1.

  Subsequently, when the square hole 92 passes, only the signal of the second LED 81 from the left end in FIG. 4 is turned on. Hereinafter, the second LED 81 from the left end is referred to as a second LED, and the signal of the second LED is referred to as a signal D2.

  When the square hole 93 passes, only the signal of the third LED 81 from the left end in FIG. 4 is turned on. Hereinafter, the third LED 81 from the left end is referred to as a third LED, and the signal of the third LED is referred to as a signal D3.

  Further, when the square hole 94 passes, only the signal of the LED 81 at the right end in FIG. 4 is turned on. Hereinafter, the rightmost LED 81 is referred to as a fourth LED, and the signal of the fourth LED is referred to as a signal D4. Moreover, all the light from the 1st-4th LED corresponding to the square holes 91-94 is interrupted for a moment, and it returns to the all-on state which is a signal state before approach after that.

  When this is viewed from the electronic control CPU 13, if the on state is "1" and the off state is "0", the signal states D1-D2-D3-D4 when the car 2 is rising are as follows: 1-1-1 (before entering), 0-0-0-0 (immediately after entering), 1-0-0-0 (when passing through square hole 91), 0-1-0-0 (when passing through square hole 92) ), 0-0-1-0 (when passing through the square hole 93), 0-0-0-1 (when passing through the square hole 94), 0-0-0-0 (just before escape), 1-1-1- It changes to 1 (after escape).

  On the other hand, the signal states D1-D2-D3-D4 when the car 2 is descending are, in order, 1-1-1-1 (before entry) and 0-0-0-0 (immediately after entry). 0-0-0-1 (when passing through square hole 94), 0-0-1-0 (when passing through square hole 93), 0-1-0-0 (when passing through square hole 92), 1-0- It changes to 0-0 (when passing through the square hole 91), 0-0-0-0 (just before escape), and 1-1-1-1 (after escape).

  That is, the position of the car 2 can be detected by determining what signal is input to the elevator control CPU 13 from the sensor 8 provided by the elevator control CPU 13. In addition, the electronic control CPU 13 can simultaneously self-diagnose the soundness of the sensor 8 by determining which of the signals D1 to D4 is in the on state and in what order the on state is transitioning. Can do.

  Here, if a reasonable abnormality such as the signal D1 and the signal D4 being simultaneously turned on is measured in the on / off signal state when the square holes 91 to 94 of the plate 9 pass, the sensor 8 A certain fixing failure has occurred, and this state can be detected in real time as the plate 9 passes the sensor 8.

  That is, every time the plate 9 passes the sensor 8, a self-diagnosis of the sensor 8 is executed, and the potential of the failure of the sensor 8 itself can be prevented, and the reliability of the system is improved. Can do. Further, it is not necessary to provide a long shielding plate in the hoistway, and only the plate 9 having the square holes 91 to 94 formed in the cage is provided, so that installation workability can be significantly improved.

As described above, according to the first embodiment, a plurality of sensors are provided in a hoistway, and three or more light projecting / receiving units each having a light projecting unit and a light receiving unit facing each other are arranged in parallel. The shielding plate is provided in the cage, and a plurality of holes are formed so as to sequentially receive light from the light projecting units opposed to each other by three or more light receiving units, and the light projecting unit and the light receiving unit By passing between the two, the light from the light projecting unit is blocked, and the control unit detects which sensor the shielding plate has passed, thereby detecting the position of the car and the light receiving unit in the sensor. The self-diagnosis of the sensor is performed based on the light receiving state.
Therefore, it is possible to obtain an elevator car position detection device having a self-diagnosis function, which has high installation workability and can simultaneously perform self-diagnosis of sensors used for car position detection when detecting the car position of the elevator. .

  In the first embodiment, the sensor 8 is a car overspeed detection point in the hoistway 1, for example, a point at which the speed of the car 2 is changed from a constant speed to a deceleration at the upper and lower end portions in the hoistway 1. By providing the car 2 at the deceleration start position, it is possible to determine in real time whether or not the speed of the car 2 exceeds the reference speed at that time, and as a sensor for the terminal floor forced deceleration device having a self-diagnosis function, The sensor 8 can be used.

  In the first embodiment, the elevator control CPU 13 detects the traveling speed and traveling direction of the car 2 based on the time that the plate 9 passes through the sensor 8 and the light receiving state of the light receiving element 82 in the sensor 8. Also good.

  Specifically, the elevator control CPU 13 determines whether the car 2 is traveling up or down based on the transition sequence of the on state, and for example, from the moment when the signal D1 becomes “1” when the car 2 rises. The time until D2 becomes “1” is measured on the basis of the clock signal used in the electronic control CPU 13, and from the vertical length of the square holes 91 to 94 provided in the plate 9 and the measurement time, The traveling speed of the car 2 at the car position can be calculated.

  As a result, speed detection according to the position of the car 2 becomes possible, and the elevator car position detection device having the self-diagnosis function according to Embodiment 1 of the present invention is overspeeded with a very simple and low-cost configuration. A detection function can be added.

Embodiment 2. FIG.
FIG. 6 is a block diagram showing an elevator car position detection apparatus having a self-diagnosis function according to Embodiment 2 of the present invention. In FIG. 6, the sensor 8 includes an in-sensor CPU 83 that is a control unit, and a signal detected by the light receiving element 82 is input to the in-sensor CPU 83.

  The in-sensor CPU 83 has a function of detecting the traveling speed and traveling direction of the car 2 based on the time that the plate 9 passes through the sensor 8 and the light receiving state of the light receiving element 82 in the sensor 8. RL 1) 14 is connected via a transistor 15 that controls ON / OFF of the relay coil 14.

  Here, a sensor 8 having a built-in sensor CPU 83 is provided at a car overspeed detection point in the hoistway 1, and the sensor CPU 83 determines that the detected traveling speed of the car 2 is relative to the detected traveling direction of the car 2. When the preset reference speed is exceeded, an abnormal signal is output to the electronics control CPU 13.

  As described above, when the sensor 8 itself detects the traveling speed of the car 2 by the in-sensor CPU 83, the excess speed of the car 2 is determined based on the detected traveling speed of the car 2, and the excessive speed of the car 2 is determined. In addition, the reaction time of the system can be shortened by outputting an abnormal signal to the electronics control CPU 13.

Embodiment 3 FIG.
FIG. 7 is a block diagram showing a safety circuit in the elevator car position detecting apparatus having a self-diagnosis function according to Embodiment 3 of the present invention. In FIG. 7, this safety circuit includes a make contact (RL1a) 16 of the relay coil 14 shown in FIG. 6, another contact 17 inserted in the safety circuit, and a contactor coil for supplying or cutting off power to the hoisting machine 5. The contact 16, the contact 17, and the contactor coil 18 are connected in series with each other.

  Here, the in-sensor CPU 83 shown in FIG. 6 directly shuts off the make contact 16 of the relay coil 14 inserted in the safety circuit when the detected traveling speed of the car 2 significantly exceeds the reference speed. Therefore, the transistor 15 is turned off with respect to the relay coil 14, and the energization to the relay coil 14 is cut off.

  At this time, the energization to the relay coil 14 is cut off, so that the safety circuit is cut off, the contactor coil 18 that controls the power supply to the hoisting machine 5 is also cut off, and the power supply to the hoisting machine 5 is cut off. Thus, the car 2 is immediately shifted to the stopped state. That is, the elevator control CPU 13 to which the abnormal signal is input from the in-sensor CPU 83 does not stop the car 2, but the in-sensor CPU 83 directly stops the car 2.

  Incidentally, various contacts 17 are connected in series to the safety circuit, and the car 2 stops when any one of the contacts is released. As a result, the reaction time of the system when the car speed is abnormal can be shortened, and the car 2 can be stopped with a configuration independent of the control panel 11, so that the monitoring function of the system can be enhanced by increasing the monitoring function. And reliability can be improved.

  DESCRIPTION OF SYMBOLS 1 Hoistway, 2 cages, 3 counterweight, 4 landing, 5 hoisting machine, 6 baffle, 7 main rope, 8 sensor, 9 plate, 10 electric wire, 11 control panel, 12 power supply, 13 electric control CPU, 14 relay Coil, 15 transistor, 16 make contact, 17 other contact, 18 contactor coil, 81 LED, 82 light receiving element, 83 CPU in sensor, 91-94 square hole.

Claims (5)

A plurality of sensors provided in the hoistway, each of which is configured by arranging three or more light projecting and receiving parts in parallel, each having a light projecting part and a light receiving part facing each other.
A shielding plate that is provided in a cage and blocks light from the light projecting unit by passing between the light projecting unit and the light receiving unit, and the three or more light receiving units are opposed to each other. A shielding plate in which a plurality of holes are formed so as to receive light from the light portion in order;
By detecting which sensor the shielding plate has passed through, the position of the car is detected, and a control unit that performs self-diagnosis of the sensor based on the light receiving state of the light receiving unit in the sensor;
Elevator car position detecting device having a self-diagnosis function. The elevator car position detection device having a self-diagnosis function according to claim 1, wherein the sensor is provided at a deceleration start position of the car at an upper and lower end portion in the hoistway. The said control part detects the traveling speed and traveling direction of the said cage based on the time when the said shielding board passes the said sensor, and the light-receiving state of the said light-receiving part in the said sensor. Elevator car position detection device with self-diagnosis function. The controller is provided in the sensor and outputs an abnormal signal to the control panel of the elevator when the traveling speed of the car exceeds a preset reference speed with respect to the traveling direction of the car. The elevator car position detecting device having the self-diagnosis function according to claim 3. The controller is provided in the sensor, and shuts off the safety circuit of the elevator when the traveling speed of the car exceeds a preset reference speed with respect to the traveling direction of the car. The elevator car position detecting device having the self-diagnosis function according to Item 3.

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