JPH0742060B2 - Elevator position detector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detecting device for an elevator, and more particularly, to a position detecting device for an elevator car near an upper terminal end and a lower terminal end in a hoistway and at each floor position. The present invention relates to an elevator position detection device that detects a position.

[Prior Art] A conventional elevator has an elevator car position detection means for detecting the height position of the elevator car in the hoistway, and an appropriate speed according to the distance to the floor at which the elevator car should be stopped. By the speed command calculation means that calculates the command,
It controls the rotation speed of the motor of the hoisting machine.

However, if the position detection means or the speed command calculation means of the elevator car is broken down for some reason, it may be in a runaway operation state, and a very dangerous operation state is also expected. In particular, in the case of an operation directly heading to the upper end portion or the lower end portion in the hoistway, the danger is great.

Therefore, a means for detecting the absolute position of the elevator car in the hoistway and a means for calculating a speed command to the floor located at the terminal end are provided near the upper end portion and the lower end portion in the hoistway. Are provided separately. When an abnormality occurs in the deceleration command to the terminal floor, an appropriate deceleration command to the terminal floor is issued instead of this, and the safe deceleration stop control of the elevator car is performed.

As means for detecting the absolute position of the elevator car in the hoistway near the terminal floor, for example, a stepped shape having a predetermined step in the hoistway with respect to the traveling direction of the elevator car,
Alternatively, there is one in which a cam having a predetermined inclination is provided, and a movable switch that operates by engaging with the cam is provided on the elevator car side.

These are disclosed in JP-A-62-280174 and JP-A-62-2183.
Japanese Patent Publication No. 82 discloses that the position of an elevator car is detected by operating a movable switch by a cam, that is, the position of the elevator car is detected by using a so-called mechanical mechanism.

In addition, as a means for detecting the position of the elevator car other than the detecting means using the mechanical mechanism, there is one using a non-contact mechanism.

One of the detection means utilizing this non-contact mechanism is disclosed in Japanese Patent Laid-Open No.
-280174. This detecting means is a plate in which a predetermined stepped cutout is arranged in the traveling direction of the elevator car, and a plurality of photoelectric detection devices are arranged in the elevator car by sandwiching the plate. In this, the photoelectric detection device operates in response to the stepped notch in the plate to detect the position of the elevator car.

An elevator car position detecting means using a non-contact mechanism other than the above is disclosed in Japanese Patent Laid-Open No. 62-218382. In this, a latch switch, which constitutes a switch-holding type switch in which a reed switch and an auxiliary magnet are enclosed in a non-magnetic container, is arranged in the hoistway, and a magnet capable of facing the latch switch is arranged in an elevator car. It is a thing. When the magnet and the latch switch face each other, the latch switch operates to detect the position of the elevator car.

Further, there is an elevator car position detecting means configured by combining the above-mentioned mechanical mechanism and non-contact mechanism.

[Problems to be Solved by the Invention] In the conventional elevator position detecting device as described above, as a means for detecting the absolute position of the elevator car in the hoistway near the terminal floor, a machine using a stepped or inclined cam is used. Or a non-contact mechanism using a plurality of photoelectric detection devices or latch switches. However, in the elevator car position detection means using this type of conventional mechanical mechanism, the cam disposed in the hoistway and the movable switch disposed in the elevator car are in direct contact with each other, so that wear,
A contact noise was generated, and it was essential to perform regular maintenance and inspections and parts replacement.

Further, in the conventional elevator car position detecting means using the non-contact mechanism, although various problems due to the mechanical mechanism described above are solved, large-scale equipment or the like is required in the hoistway. That is, it is necessary to dispose a plate having a stepped notch in the hoistway, or to install a complicated hoistway wiring to dispose a plurality of latch switches in the hoistway. It was

Therefore, it is an object of the present invention to provide an elevator position detecting device that can detect the position of an elevator car by using a non-contact mechanism and that does not require large-scale equipment such as complicated wiring in a hoistway.

[Means for Solving the Problems] An elevator position detecting device according to the present invention includes a plurality of reed switches, and an auxiliary magnet that is magnetically coupled to each of the plurality of reed switches and holds the opening / closing operation. An elevator that consists of a plurality of latch switches arranged in an elevator car that maintains an open / closed state by an external magnetic field applied to the reed switch, and that receives signals from each contact of the plurality of latch switches and that can be transmitted via a transmission circuit. Corresponding to each of the plurality of latch switches and a signal converter for converting into a car position signal, a plurality of latch switches are provided in the hoistway at predetermined intervals in the upward movement direction of the car. And a plurality of upper magnets that face each other with a predetermined magnetic pole to apply an external magnetic field, and a plurality of upper magnets are respectively provided in the hoistway. And a plurality of latch switches and a plurality of lower magnets facing each other with magnetic poles opposite to the predetermined magnetic poles and applying an external magnetic field. .

[Operation] In the position detecting device for an elevator of the present invention, a plurality of latch switches, which are magnetically operated by being in close proximity to and facing the magnet and whose contact opening / closing state is determined by the passing direction, are moved together with the elevator car. Then, the contact state signals from the plurality of latch switches are converted into position signals of the elevator car that can be transmitted via the transmission line by the signal converter, and the hoistways corresponding to the moving directions of the plurality of latch switches. Since a plurality of upper magnets and lower magnets having opposite magnetism in the upper part and the lower part of the inside are arranged for each latch switch at a predetermined interval, the position of the elevator car is not contacted. In addition, a common latch switch can be used to detect the positions of the upper and lower elevator cars in the hoistway. No complicated wiring in the hoistway is required for transmitting the position signal of the elevator car.

[Embodiment] FIG. 1 is a block diagram showing an elevator position detecting apparatus according to an embodiment of the present invention.

In the figure, 1 is a position detecting device for an elevator car 2, 3
Is a latch switch that magnetically operates when it comes into close proximity with the magnet. This embodiment has a total of three latch switches 3, a first latch switch 3a, a second latch switch 3b, and a third latch switch 3c. Reference numeral 4 is a signal converter for converting each contact state signal from each latch switch 3a, 3b, 3c into a position signal of the elevator car 2, and a predetermined logical conversion of the open / closed state of the contact of each latch switch 3a, 3b, 3c. , For example, it is converted into an analog voltage signal by a binary code or the like and output. Reference numeral 5 is an upper magnet which is arranged at a predetermined interval on the upper side in the hoistway corresponding to the moving direction of each latch switch 3a, 3b, 3c. The magnet 5a is arranged so that the second upper magnet 5b corresponds to the second latch switch 3b and the third upper magnet 5c corresponds to the third latch switch 3c. Reference numeral 6 denotes a lower magnet arranged at a lower side in the hoistway corresponding to the moving direction of each of the latch switches 3a, 3b, 3c with a predetermined space therebetween. The magnet 6a is the second latch switch.
The second lower magnet 6b is arranged corresponding to 3b, and the third lower magnet 6c is arranged corresponding to the third latch switch 3c. The lower magnet 6 and the upper magnet 5 have reverse magnetism in the upper part and the lower part in the hoistway.

The position detecting device for the elevator of this embodiment is configured as described above, and the position detecting device 1 converts the position signal of the elevator car 2 into a signal that can be transmitted by at least one transmission line.

Next, the configuration and operation of the latch switch 3 used in this embodiment will be described.

FIG. 2 is an operation explanatory view of the latch switch used in the elevator position detecting apparatus of this embodiment. FIGS. 2A and 2B show the engagement relationship between the latch switch 3 and the lower magnet 6, and FIGS. 2C and 2D show the engagement relationship between the latch switch 3 and the upper magnet 5. is there. Note that, in the drawing, reference numerals 3, 5, and 6 are the same as or correspond to the constituent portions of the above-described embodiment, and therefore, duplicated description will be omitted here.

In the figure, 7 is a reed switch that opens and closes according to changes in magnetic flux, and 8 is an upper magnet 5 that sandwiches the reed switch 7.
Alternatively, it is an auxiliary magnet mounted at a position facing the lower magnet 6. The reed switch 7 and the auxiliary magnet 8 are both enclosed in a non-magnetic container to form the latch switch 3. This latch switch 3
Operates with a change in magnetic flux generated when the lower magnet 6 or the upper magnet 5 approaches.

In FIG. 2A, when the latch switch 3 descends from above toward the lower magnet 6 and reaches the position shown in the figure, the S pole of the auxiliary magnet 8 and the N pole of the lower magnet 6 face each other. In this case, as shown in the figure, the magnetic flux passing through the inside of the reed switch 7 becomes almost zero, and the reed switch 7 opens. When the latch switch 3 moves further below the illustrated position with respect to the lower magnet 6, the auxiliary magnet 8
The magnetic flux due to passes through the inside of the reed switch 7,
However, the reed switch 7 cannot be operated only by the magnetic flux generated by the auxiliary magnet 8, and the reed switch 7 maintains the open state.

In FIG. 2B, when the latch switch 3 rises to the lower magnet 6 and reaches the position shown in the drawing, after the open state of FIG. The N pole of the magnet 6 faces and the magnetic flux generated by the auxiliary magnet 8 is superposed and passes through the reed switch 7 to enter the S pole. As a result, the contact of the reed switch 7 is closed. When the latch switch 3 is moved further away from the lower magnet 6, the magnetic flux passing through the reed switch 7 is only the magnetic flux generated by the auxiliary magnet 8, but the residual holding force of the magnetic material forming the reed switch 7 is retained. As a result, the reed switch 7 maintains the closed state.

Next, the relationship between the latch switch 3 and the upper magnet 5 will be described.

In FIG. 2C, when the latch switch 3 rises from below with respect to the upper magnet 5 and reaches the position shown in the figure, the N pole of the auxiliary magnet 8 and the S of the upper magnet 5 are S.
The poles face each other. At this time, the magnetic flux passing through the inside of the reed switch 7 becomes almost zero, and the reed switch 7 opens. When the latch switch 3 is moved further away from the position shown in the figure with respect to the upper magnet 5, the magnetic flux from the auxiliary magnet 8 passes through the reed switch 7, but the magnetic flux from the auxiliary magnet 8 alone causes the reed switch 7 to move. It cannot be operated, and the reed switch 7 maintains the open state.

In FIG. 2 (d), when the latch switch 3 comes down to the upper magnet 5 and reaches the position shown in the drawing, the second
After the open state in FIG. 7C has passed, the S pole of the auxiliary magnet 8 and the S pole of the upper magnet 5 face each other, and the magnetic flux generated by the auxiliary magnet 8 is superimposed and emitted from the N pole of the reed switch 7. The magnetic flux passes through the reed switch 7 and enters the S pole. As a result, the contact of the reed switch 7 is closed. Latch switch 3 for upper magnet 5
As the magnetic flux passes through the reed switch 7 only further, the magnetic flux passing through the reed switch 7 is only the magnetic flux generated by the auxiliary magnet 8. However, the reed switch 7 is closed due to the residual holding force of the magnetic material forming the reed switch 7. Hold.

Therefore, as shown in FIG.
If the lower magnet 6 and the lower magnet 6 are arranged in a hoistway across a predetermined floor, the elevator car 2 is lowered, and the first latch switch 3a is located below the first lower magnet 6a. The contacts of the latch switch 3a are open.
Further, the elevator car 2 rises, and the contacts of the first latch switch 3a are closed when the first latch switch 3a is above the first lower magnet 6a. Then, the first latch switch 3a is kept open above the first upper magnet 5a. When the elevator car 2 reverses its traveling direction and descends, the contacts of the first latch switch 3a are closed again by passing through the first upper magnet 5a.

Thus, when the first latch switch 3a is located in the area between the first upper magnet 5a and the first lower magnet 6a, it is in the closed state, and when it is located in other areas. It will be open.

The second latch switch 3b and the third latch switch 3c also operate similarly to the first latch switch 3a.

Here, the open / closed state of each contact of the latch switch 3 and the position signal of the elevator car 2 transmitted by the signal converter 4 will be described.

FIG. 3 is a characteristic diagram showing the relationship between the contact state signal of the latch switch and the output signal of the signal converter of the position detecting device for the elevator of this embodiment.

In the figure, A indicates the contact state signal of the first latch switch 3a, similarly, B indicates the contact state signal of the second latch switch 3b, and C indicates the contact state signal of the third latch switch 3c. Show. D represents the output signal of the signal converter 4.

In this way, each signal A according to the position of the elevator car 2,
Upon receiving B and C, the signal converter 4 outputs a stepwise signal whose voltage changes at the change points of the signals A, B and C as a position signal of the elevator car 2. With this signal, an appropriate deceleration command is issued to the final floor, and safe deceleration stop control of the elevator car can be performed.

As described above, in this embodiment, the reed switch 7 includes the plurality of reed switches 7 and the auxiliary magnet 8 that is magnetically coupled to each of the plurality of reed switches 7 and holds the opening / closing operation. It is possible to receive signals from a plurality of latch switches 3 arranged in the elevator car 1 that maintain the open / closed state by an external magnetic field applied to the plurality of latch switches 3 and respective contacts of the plurality of latch switches 3, and transmit the signals via a transmission line. A signal converter 4 for converting the position signal of the elevator car 1 and a predetermined distance in the hoistway,
An upper magnet that opposes a specific magnetic pole with respect to the specific latch switch 3 corresponding to the upward movement direction in the hoistway, and applies an external magnetic field to the specific latch switch 3;
The specific latch is arranged in the hoistway at a predetermined interval, and the magnetic pole on the opposite side of the magnetic pole faces the other latch switch 3 corresponding to the downward movement direction in the hoistway. The lower magnet 6 for applying an external magnetic field to the switch 3 is provided.

Therefore, by moving the plurality of latch switches 3 together with the elevator car 2 and disposing the upper magnet 5 and the lower magnet 6 at the positions facing the predetermined floor, the position of the elevator car 2 can be detected by the non-contact means. Unlike the conventional elevator car position detecting means using a mechanical mechanism, no wear or contact noise occurs, and periodic maintenance and parts replacement are unnecessary.

Further, in this embodiment, the upper magnet 5 and the lower magnet 6 are provided with magnets having different characteristics, so that the common latch switch 3 is used to detect the positions of the upper and lower elevator cars 2. . Moreover, each contact state signal from the plurality of latch switches 3 can be received and converted by the signal converter 4 into a position signal of the elevator car 2 that can be transmitted by at least one transmission line. Therefore, like the elevator car position detection means using the conventional non-contact mechanism, it is not necessary to install large-scale equipment in the hoistway, or complicated wiring in the hoistway, and it is possible to promote miniaturization and weight reduction, Mounting workability is improved.

The magnets have opposite magnetisms in the upper and lower parts of the hoistway with respect to each latch switch 3, and the upper magnet 5 and the lower magnet 6 are arranged so as to shift the positions where the magnetisms are opposite to each other. As shown in FIG. 3, the upper magnet 5 whose magnetism is displaced in the opposite position is used.
With the lower magnet 6, if the signal form is matched with a binary code or the like, the squared position of 2 can be detected. The positions of the upper magnet 5 and the lower magnet 6 in this embodiment are not limited to the vicinity of the upper end portion and the lower end portion, and in the case of practicing the present invention, the positions of the upper and lower portions. Any relationship will do.

In this embodiment, the open / close state of the reed switch 7 in the latch switch 3 is opened in the region toward the end of the hoistway, and the voltage signal of the signal converter 4 is set to a low level. The reason is that safety is taken into consideration with respect to contact failure of the contact of the reed switch 7.

By the way, in the above embodiment, the position detecting device for the elevator in which the latch switch 3, the upper magnet 5 and the lower magnet 6 are provided in the number of three, respectively, has been described, but the number is not limited to three, and the number is not limited to three. You may increase. When the number is increased, the content can be increased accordingly.

Also, in the above description, the signal converter 4 converts the open / close state signal of the latch switch 3 into an analog signal, but even if it is converted into a serial digital signal, the same effect as in the above embodiment can be obtained. . Then, if the increase in the number of lines is allowed, the outputs converted into parallel digital signals can be used.

[Effects of the Invention] As described above, the position detecting device for an elevator according to the present invention magnetically couples with a magnet and moves a plurality of latch switches whose contact state is determined by a passing direction together with the elevator car. The signal of each contact state of the latch switch can be converted into a position signal of the elevator car by a signal converter, and the magnetism is reversed from the characteristics above and below in the hoistway corresponding to the moving direction of the plurality of latch switches. By disposing a plurality of upper magnets and lower magnets for each latch switch at a predetermined interval, the position of the elevator car can be detected without contact. Further, the position of the upper and lower elevator cars in the hoistway can be detected by using the common latch switch, and complicated wiring in the hoistway is not required for transmitting the position signal of the elevator car. Further, since the detection is performed in a non-contact manner, wear, contact noise, etc. do not occur, and periodic maintenance / inspection and replacement of parts become unnecessary. At the same time, the size and weight of the elevator can be reduced, and the workability of mounting the elevator position detection device is improved.

Further, since the magnetism has opposite characteristics to the upper and lower sides of the hoistway with respect to each latch switch, and the upper magnet and the lower magnet are arranged so as to be displaced so that the magnetism has opposite characteristics. Since the change of the signal of each latch switch can be obtained at two different positions in the hoistway by the upper magnet and the lower magnet whose magnetism has opposite characteristics, it is possible to detect two positions for each latch switch. The position of the square of 2 can be detected by the logarithm of the latch switch, the upper magnet, and the lower magnet.

Therefore, the non-contact mechanism can be used to detect the position of the elevator car, and there is an effect that large-scale equipment such as complicated wiring in the hoistway is not required.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an elevator position detecting device according to an embodiment of the present invention, and FIG. 2 is an operation explanatory diagram of a latch switch used in the elevator position detecting device according to an embodiment of the present invention. FIG. 3 is a characteristic diagram showing the relationship between the contact state signal of the latch switch and the output signal of the signal converter of the elevator position detecting apparatus according to the embodiment of the present invention. In the figure, 2: elevator car, 3: latch switch, 4: signal converter 5: upper magnet, 6: lower magnet. In the drawings, the same reference numerals and symbols indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A reed switch and an auxiliary magnet that is magnetically coupled to each of the reed switches and holds the opening / closing operation of the reed switch. The opening / closing is performed by an external magnetic field applied to the reed switch. A plurality of latch switches arranged in the elevator car that maintains the state, and a signal converter that receives signals from each contact of the plurality of latch switches and converts the position signals of the elevator car that can be transmitted via a transmission circuit, Corresponding to each of the plurality of latch switches, each of the plurality of latch switches is provided in the hoistway at a predetermined interval in the upward movement direction of the car, and is opposed to the plurality of latch switches with a predetermined magnetic pole. Corresponding to each of the plurality of upper magnets that provide a magnetic field, and each of the plurality of upper magnets, a predetermined space is provided in the hoistway in the downward movement direction of the car. And a plurality of lower magnets facing each other with magnetic poles opposite to the predetermined magnetic poles and applying an external magnetic field. .