JP2020132291A - elevator - Google Patents

Abstract

To provide an elevator in which malfunction due to low atmospheric temperature of a door device is hard to occur.SOLUTION: The elevator comprises: a door device having a door for opening/closing a doorway, and a drive unit for driving opening/closing of the door; a control unit for controlling the door device; and a temperature measurement unit which can measure an atmospheric temperature of the door device. When a temperature detection unit detects that the atmospheric temperature becomes smaller than a prescribed value, the control unit causes the door device to perform at least one operation of door opening operation and door closing operation at least once for each lapse of a prescribed time.SELECTED DRAWING: Figure 2

Description

The present invention relates to an elevator including a door device that opens and closes at least one doorway of a car and a landing.

Conventionally, there has been known an elevator provided with a door device that prevents freezing even when the ambient temperature is low and allows the door of the entrance / exit to open and close normally (see Patent Document 1). Specifically, as shown in FIG. 4, the door device of this elevator includes a frame-shaped body 920 composed of a three-sided frame 930 and a threshold 940 to form an edge of the entrance / exit 910, a door 950 for opening / closing the entrance / exit 910, and the like. A hot air heater 960 provided in the three-sided frame 930 is provided.

The three-sided frame 930 is composed of an upper edge member 931 extending in the horizontal direction and a pair of side edge members 932 extending downward from both ends of the upper edge member 931. Further, the warm air heater 960 is provided on the upper edge member 931 and blows warm air downward along the surface of the door 950 over the entire length of the length of the upper edge member 931 (see the arrow of the alternate long and short dash line in FIG. 4).

In the elevator door device 900 described above, the door 950 is heated by the hot air heater 960 blowing warm air downward along the surface of the upper edge member 931 to the door 950 over the entire length of the length of the upper edge member 931. .. As a result, freezing can be prevented between the upper edge member 931 and each side edge member 932 and the door 950, and at the door contact point of the door 950 (that is, between the doors 950).

Japanese Unexamined Patent Publication No. 2003-2571

However, in the door device 900 described above, the warm air heater 960 heats the door 950 to prevent freezing between the frame-shaped body 920 and the door 950 and the door contact portion of the door 950. The drive unit or the like (for example, the drive motor or the mechanism for transmitting the power generated by the drive motor to the door 950) for opening and closing the door 950 is not heated, and the drive unit cannot be prevented from freezing.

For this reason, in the door device 900 described above, when the atmospheric temperature becomes low, movable parts such as a drive unit may become difficult to move due to freezing or the like, and the door 950 may not be able to open and close normally (that is, malfunction may occur). The door.

Therefore, it is an object of the present invention to provide an elevator in which malfunctions due to low atmospheric temperature are unlikely to occur in a door device.

The elevator of the present invention
A door device having a door that opens and closes at least one doorway of a car and a landing, and a drive unit that includes a motor and transmits the power of the motor to open and close the door.
A control unit that controls the door device and
A temperature detection unit capable of detecting the ambient temperature of the door device is provided.
When the temperature detection unit detects that the atmospheric temperature has become smaller than a predetermined value, the control unit causes the door device to perform at least one of the door opening operation and the door closing operation every predetermined time. At least once.

According to such a configuration, even if the atmospheric temperature becomes low (even if it becomes smaller than a predetermined value), at least one of the door opening operation and the door closing operation is performed at least once in the door device every predetermined time elapse. That is, by moving each movable part of the drive unit (motor, mechanism for transmitting the power of the motor to the door, etc.) before it becomes difficult to move due to freezing or the like, it is possible to suppress freezing or the like of the movable part and make it difficult to move. This makes it difficult for the door device to malfunction due to the low atmospheric temperature.

In the elevator
The control unit may perform the door opening / closing operation when the atmospheric temperature is smaller than the predetermined value at a lower speed than the door opening / closing operation when the atmospheric temperature is equal to or higher than the predetermined value.

In this way, by slowing the opening and closing operation of the door when the atmospheric temperature is low, the problem caused by the fact that each movable part of the drive unit becomes difficult to move due to the decrease in the atmospheric temperature (for example, the torque of the motor). It is possible to prevent the occurrence of (such as the current becoming too large).

Further, the elevator includes a sensor capable of detecting an object on the orbit of the door, and the control unit stops the door closing operation when the sensor detects the object when the door is closed. Alternatively, it may be inverted.

According to such a configuration, it is possible to reliably prevent an accident due to pinching of a person or the like even during an operation (opening / closing operation) for preventing a malfunction due to freezing or the like in the door device.

From the above, according to the present invention, it is possible to provide an elevator in which malfunctions due to low atmospheric temperature are unlikely to occur in the door device.

FIG. 1 is a schematic diagram for explaining the configuration of the elevator according to the present embodiment. FIG. 2 is a diagram for explaining the configuration of the car of the elevator, and is a view in a state where the car door is closed. FIG. 3 is a diagram for explaining the configuration of the car of the elevator, and is a view in a state where the car door is open. FIG. 4 is a schematic diagram for explaining a conventional door device.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, the elevator according to the present embodiment includes a car 3 for raising and lowering a hoistway 2 extending in the vertical direction across a plurality of floors in the building. In this elevator 1, the car 3 stops at the landing 4 on a predetermined floor (landing on the floor where the landing 4 is provided), and the car door 51 and the landing door 41 open, so that the user or the like can move to the car 3. Get on and off.

As shown in FIGS. 2 and 3, the car 3 controls a car body 30 having a rectangular doorway 31, a door device 5 having a car door 51 that opens and closes the doorway 31 of the car body 30, and a door device 5. A control unit 6 for the operation and a temperature detection unit 7 capable of detecting the ambient temperature of the door device 5 are provided. Further, the car 3 includes a sensor 8 capable of detecting an object in the orbit of the car door 51.

The car body 30 has an internal space, and people and things can get on and off through the doorway 31. In the car body 30, the doorway 31 is defined by a three-way frame (frame member) 311 and a threshold 312 that extends horizontally at the lower end of the three-way frame 311 and guides the lower end of the car door 51 in the width direction of the doorway 31. ing. The car body 30 has a rail 32 extending in the width direction (horizontal direction) of the doorway 31 above the doorway 31. The rail 32 guides the car door 51 when the car door 51 opens and closes.

The door device 5 includes a car door (door) 51 that opens and closes the doorway 31 of the car body 30, and a drive unit 52 that drives the car door 51 to open and close.

The car door 51 is a rectangular panel. The car 3 of the present embodiment is a so-called center open type having two car doors 51.

The drive unit 52 is arranged in the car body 30 and directly or indirectly drives the car door 51. The drive unit 52 has a pair of pulleys 521 arranged at intervals in the opening / closing direction of the car door 51 (width direction of the entrance / exit 31) above the rail 32, and an endless ring wound around the pair of pulleys 521. The belt 522 and the motor 523 that rotationally drives one of the pulleys 521 of the pair of pulleys 521. The drive unit 52 also has a door hanger 524 that is connected to the belt 522 and can reciprocate along the rail 32 with the car door 51 suspended directly or indirectly. Since the car 3 of the present embodiment has two car doors 51, the drive unit 52 has two door hangers 524. Each of these two door hangers 524 has a plurality of rollers 5241 that roll on the rail 32 as the door hanger 524 reciprocates along the rail 32.

The temperature detection unit 7 detects the ambient temperature (atmosphere temperature) of the drive unit 52, and outputs the detection result as a detection signal to the control unit 6. The temperature detection unit 7 of the present embodiment is a thermostat, and outputs a detection signal to the control unit 6 when the temperature around the drive unit 52 becomes smaller than a predetermined value. When the temperature around the drive unit 52 drops below 0 ° C, the temperature detection unit 7 of the present embodiment outputs a detection signal to the control unit 6 while the temperature around the drive unit 52 is lower than 0 ° C. (That is, until the temperature rises to 0 ° C. or higher), the detection signal is continuously output.

The sensor 8 can detect an object on the orbit of the car door 51 when the door is closed (that is, an object (including a person) located between the car door 51 when the door is closed), and detects the object. Outputs a detection signal when The sensor 8 of the present embodiment is, for example, a multi-optical axis sensor using infrared rays or the like (see the broken line α between the car doors 51 in FIG. 3), and is a door stop portion (door) of two (pair) car doors 51. Detects objects between (ends in the closing direction).

When the temperature detection unit 7 detects that the temperature around the drive unit 52 has become smaller than a predetermined value, the control unit 6 causes the door device 5 to open and close the car door 51 every predetermined time. At least one of the operations is performed at least once.

When the temperature detection unit 7 detects that the temperature around the drive unit 52 has become smaller than a predetermined value, that is, when the detection signal from the temperature detection unit 7 is input to the control unit 6 of the present embodiment. The door device 5 is made to perform the reciprocating operation of opening and closing the car door 51 (specifically, the reciprocating operation of the car door 51 which is fully opened and then fully closed) a plurality of times every predetermined time elapses (for example, every 30 minutes elapses). More specifically, the control unit 6 continuously opens and closes the car door 51 to the door device 5 every 30 minutes while the detection signal output from the temperature detection unit 7 is input. Let it be done once.

During this periodic opening / closing reciprocating operation of the car door 51 (every predetermined time elapses), the control unit 6 tells the door device 5 when the temperature around the drive unit 52 is equal to or higher than the predetermined temperature (normal time). The opening / closing reciprocating operation of the car door 51 is performed so as to be slower than the opening / closing speed of the car door 51 (for example, about 70% to 90% of the normal opening / closing speed). If the opening / closing speed of the car door 51 during the periodic opening / closing reciprocating operation of the car door 51 is lower than 70% of the normal time, the convenience is reduced, and if it is raised more than 90%, there is a margin of torque current value ( There is no margin up to the value when the operation is stopped as an abnormal value).

When the input of the detection signal from the temperature detection unit 7 is stopped, the control unit 6 returns the operation of the car door 51 of the door device 5 to the normal operation. That is, in the state where the detection signal is not input, the control unit 6 periodically opens and closes the car door 51 (every predetermined time elapses), that is, the car door 51 does not open or close or opens and closes due to low temperature. The door device 5 is not instructed to open and close the car door 51 for the purpose of preventing it from becoming difficult.

Further, the control unit 6 is pressed at the landing 4 even when the detection signal from the temperature detection unit 7 is continuously input (when the temperature around the drive unit 52 is smaller than a predetermined value). At the time (when a call is made), the door device 5 is made to perform a normal opening / closing operation of the car door 51. That is, even if the input of the detection signal continues, when the call from the landing 4 is received, the control unit 6 causes the door device 5 to perform the door device 5 at a normal speed instead of the low-speed door opening operation and door closing operation. To open and close the door.

Further, when the control unit 6 detects an object on the orbit of the car door 51 by the sensor 8 when the door is closed, the control unit 6 stops or reverses the door closing operation of the car door 51. The control unit 6 of the present embodiment reverses the door closing operation of the car door 51 when the detection signal from the sensor 8 is input regardless of whether or not the detection signal is input from the temperature detection unit 7. That is, the control unit 6 instructs the door device 5 to switch the door closing operation to the door opening operation at the timing when the detection signal is input.

In the elevator 1 of the present embodiment, the door device 5 opens and closes the car door 51 of the car 3 and also opens and closes the door (landing door) 41 of the landing 4 on the floor. That is, when the car 3 stops at the landing 4 on a predetermined level, the car door 51 and the landing door 41 engage with each other, and when the car door 51 is opened and closed by the door device 5, the landing door 41 becomes the car door. It opens and closes following the opening and closing of 51.

According to the above elevator 1, when the ambient temperature (atmospheric temperature) of the drive unit 52 becomes low (in the example of the present embodiment, when the temperature becomes lower than 0 ° C.), the door is opened every predetermined time. The device 5 performs a reciprocating operation of opening and closing the car door 51 (a reciprocating operation of fully closing the car door 51 after the car door 51 is fully opened from the fully closed state) a plurality of times. As described above, in the elevator 1 of the present embodiment, by moving each movable portion of the drive unit 52 before it becomes difficult to move due to freezing or the like, the freezing or the like of the movable portion is suppressed to prevent the movable portion from becoming immobile or difficult to move. As a result, the door device 5 is less likely to malfunction due to the low temperature around the drive unit 52. The details are as follows.

For example, when the temperature around the car 3 falls below 0 ° C. and a sufficient time elapses, the temperature of each component constituting the car 3 and the door device 5 is sufficiently lowered. If the door device 5 tries to open and close the car door 51 in this state, the torque current value of the motor 523 of the drive unit 52 becomes too large, and the control unit 6 causes an abnormal value (a specified value set for safety). It is determined that the car door 51 is stopped in the middle of opening or closing the door, and the normal opening / closing operation of the car door 51 may not be performed.

The cause of this is, for example, the case where the winding resistance of the motor 523 decreases due to the temperature drop and the current flowing through the motor 523 increases and the torque current value becomes an abnormal value, or the motor when the car door 51 is opened and closed. It is conceivable that the load applied to the 523 increases and the torque current value becomes an abnormal value due to this. Here, the load applied to the motor 523 increases due to the temperature drop because each movable portion of the drive unit 52 does not move or becomes difficult to move due to freezing, or around the axis of each roller 5241 of the pulley 521 or the door hanger 524. The mechanical viscosity of the oil increases and it becomes difficult to rotate, and the rotating part becomes difficult to rotate (rotate) due to the hardening of the bearing grease of the bearing arranged in the rotating part such as the bearing of the reduction shaft of the motor 523. Or, the members (pulley 521, etc.) wound around the pair of pulleys 521 due to the contraction of the belt 522, etc., become difficult to rotate, and the bearings are changed due to the difference in shrinkage ratio and fitting of each component. This is the case where the roller is pressed and the resistance increases, making it difficult for the rotating member received by the bearing to rotate.

However, as in the elevator 1 of the present embodiment, when the temperature around the drive unit 52 becomes low (in the example of the present embodiment, the temperature becomes lower than 0 ° C.), the door device 5 is used every predetermined time. By moving each movable part of the drive unit 52 by performing the opening and closing reciprocating operation of the car door 51 a plurality of times, for example, freezing of the movable part can be suppressed, or the temperature of the movable part can be lowered by moving each movable part. It can be suppressed, or the temperature drop of the winding can be suppressed by Joule heat generated by the flow of an electric current such as a motor 523, so that the decrease in resistance value due to the temperature drop can be suppressed.

As a result, in the elevator 1 of the present embodiment, even if the temperature around the car 3 falls below 0 ° C. and a sufficient time elapses, the drive unit 52 tries to open and close the car door 51 when the door device 5 tries to open and close the car door 51. It is possible to prevent the torque current value of the motor 523 from becoming too large. As a result, in the elevator 1 of the present embodiment, the door device 5 is less likely to malfunction due to the low temperature around the drive unit 52.

Further, in the elevator 1 of the present embodiment, the control unit 6 tells the door device 5 that the temperature around the drive unit 52 is smaller than a predetermined value (0 ° C. in the example of the present embodiment) of the car door 51. The opening / closing reciprocating operation is performed at a lower speed than the normal opening / closing operation (opening / closing operation of the car door 51 when the temperature around the drive unit 52 is equal to or higher than a predetermined value). Specifically, the control unit 6 determines the speed of the car door 51 when the door is opened when the temperature around the drive unit 52 is smaller than a predetermined value, and the door when the temperature around the drive unit 52 is equal to or higher than a predetermined value. The speed of the car door 51 when the door is closed is set to a predetermined temperature while the speed of the car door 51 is set to be lower than the speed of the car door 51 when the door is open and the temperature around the drive unit 52 is smaller than a predetermined value. The speed is slower than the speed of the car door 51 when the door is closed when the value is equal to or higher than the value.

In this way, when the temperature around the drive unit 52 is low, the opening / closing reciprocating operation of the car door 51 is made slower than usual, so that the drive unit 52 has a temperature lower than that when the temperature is equal to or higher than a predetermined value. The occurrence of problems caused by the difficulty of moving each movable portion (for example, the torque current of the motor 523 becomes too large) can be preferably prevented.

Further, in the elevator 1 of the present embodiment, when the sensor 8 detects an object when the door is closed, the control unit 6 instructs the door device 5 to reverse the door closing operation of the car door 51. As a result, it is possible to reliably prevent an accident due to pinching of a person or the like even during the operation (during the opening / closing reciprocating operation) for preventing the malfunction of the door device 5 due to the temperature drop.

The elevator of the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. In addition, some of the configurations of certain embodiments can be deleted.

In the elevator 1 of the above embodiment, the control unit 6 is arranged in the car 3, but the present invention is not limited to this configuration. The control unit 6 may be arranged at a position away from the car 3.

In the elevator 1 of the above embodiment, the temperature detection unit (thermostat) 7 can only detect whether or not the ambient temperature is smaller than a predetermined value, but the configuration is not limited to this. The temperature detection unit 7 may have a configuration such as a temperature sensor that can measure the ambient temperature (for example, a configuration in which the output signal changes according to the detected temperature). In this case, when the control unit 6 detects the atmospheric temperature based on the input signal and determines that the atmospheric temperature becomes smaller than the predetermined value, the door device 5 is notified of the car door 51 every predetermined time. To open and close the door.

Further, when the atmospheric temperature of the drive unit 52 becomes smaller than a predetermined value, the control unit 6 of the above embodiment continuously opens and closes the car door 51 7 to 8 times every predetermined time. Let it do, but is not limited to this configuration.

The control unit 6 may be configured to perform the opening / closing reciprocating operation of the car door 51 1 to 6 times or 9 times or more every predetermined time.

Further, the control unit 6 may be configured to perform one of the opening operation and the closing operation of the car door 51 every predetermined time elapses. In this case, for example, the control unit 6 alternately performs only the opening operation and only the closing operation every predetermined time elapses.

Further, in the control unit 6 of the elevator 1 of the above embodiment, the threshold value of the atmospheric temperature as to whether or not to perform the intermittent opening / closing reciprocating operation (opening / closing reciprocating operation every predetermined time elapse) is 0 ° C. It is not limited to the configuration. Since the temperature at which it becomes difficult to move differs depending on the material and structure of the member constituting the movable portion of the drive unit 52, the threshold value (predetermined value) is appropriately set according to the temperature at which it begins to become difficult to move. In this case, the threshold value is not limited to a predetermined value of less than 0 ° C., and may be 0 ° C. or a value slightly larger than 0 ° C. (for example, about 0 ° C. to 5 ° C.). It should be noted that this value (0 ° C. to 5 ° C.) is set by causing the door device 5 to perform an intermittent opening / closing reciprocating operation (opening / closing reciprocating operation every predetermined time elapse) in actual operation or experiment. This is a range in which the problem that the torque current value becomes too large does not occur because the movable portion of 52 becomes difficult to move due to the temperature drop.

Further, the control unit 6 of the above embodiment causes the door device 5 to perform the opening / closing reciprocating operation of the car door 51 every 30 minutes when the atmospheric temperature becomes smaller than a predetermined value. Not limited to. Even at the same temperature, the time during which the drive unit 52 becomes difficult to move differs depending on the material and structure of the members constituting the movable portion of the drive unit 52. Therefore, the interval for performing the opening / closing reciprocating operation is appropriately set according to the time at which the drive unit 52 begins to become difficult to move.

In the elevator 1 of the above embodiment, the door device 5 is provided in the car 3, but is not limited to this configuration. The door device 5 may be provided in the landing 4, or may be provided in each of the car 3 and the landing 4.

The door device 5 (elevator 1) of the above embodiment is a so-called center open type in which two (plurality) car doors 51 and the like open doors toward both sides in the width direction of the doorway 31, but is limited to this configuration. Not done. The door device 5 (elevator 1) may be a so-called single door type in which the car door 51 or the like opens the door toward one side of the doorway 31 in the width direction.

In the elevator 1 of the above embodiment, the temperature detection unit 7 is arranged around the drive unit 52 or the drive unit 52, but the configuration is not limited to this. The temperature detection unit 7 may be arranged at a location (for example, in the hoistway 2 or around the car 3) where the temperature is about the same as the temperature around the drive unit 52.

The specific configuration of the drive unit 52 in the door device 5 is not limited. For example, in the door device 5 of the present embodiment, the movable parts are, for example, a pulley 521, a belt 522, a motor 523, a roller 5241 of a door hanger 524, and the like. In addition to these configurations, a car door 51 and a landing door 41 It may have one or more movable parts that move with the opening and closing of the door.

1 ... elevator, 2 ... hoistway, 3 ... car, 30 ... car body, 31 ... doorway, 311 ... three-sided frame, 312 ... threshold, 32 ... rail, 4 ... landing, 41 ... landing door (door), 5 ... door Device, 51 ... Car door (door), 52 ... Drive unit, 521 ... Pulley (movable part), 522 ... Belt (movable part), 523 ... Motor (movable part), 524 ... Door hanger (movable part), 5241 ... Roller (movable part), 6 ... control unit, 7 ... temperature detection unit, 8 ... sensor, 900 ... door device, 910 ... doorway, 920 ... frame-shaped body, 930 ... three-sided frame, 931 ... upper edge member, 932 ... side Edge member, 940 ... threshold, 950 ... door, 960 ... warm air heater, α ... infrared

Claims (3)

A door device having a door that opens and closes at least one doorway of a car and a landing, and a drive unit that includes a motor and transmits the power of the motor to open and close the door.
A control unit that controls the door device and
A temperature detection unit capable of detecting the ambient temperature of the door device is provided.
When the temperature detection unit detects that the atmospheric temperature has become smaller than a predetermined value, the control unit causes the door device to perform at least one of the door opening operation and the door closing operation every predetermined time. An elevator that lets you do it at least once. 1. The control unit causes the door opening / closing operation when the atmospheric temperature is smaller than the predetermined value to be performed at a lower speed than the door opening / closing operation when the atmospheric temperature is equal to or higher than the predetermined value. Elevator described in. A sensor capable of detecting an object in the orbit of the door is provided.
The elevator according to claim 1 or 2, wherein the control unit stops or reverses the door closing operation of the door when the object is detected by the sensor when the door is closed.