JP5838041B2 - Switchgear - Google Patents

Description

  The present invention relates to an opening / closing device that closes an opening / closing body by operating an automatic closing device in a disaster or the like, and more particularly, to an opening / closing device suitable as a fire / smoke / shutter shutter device that closes the opening / closing body by its own weight. .

  Conventionally, this type of opening / closing device includes an opening / closing body that can be closed by its own weight, a braking device that brakes the closing operation of the opening / closing body, and an automatic closing device that releases a braking state by the braking device. It has been known. According to such an opening / closing device, when the automatic closing device is activated in response to a signal at the time of disaster such as a fire, the automatic closing device releases the braking state by the braking device, and the opening / closing body is closed by its own weight. Operate. Therefore, it is possible to prevent the spread of fire and smoke from fire.

  For example, in the automatic closing device described in Patent Document 1 below, the brake release lever (21) of the brake device (8) is moved to the brake release position by the brake release operation part (closing lever 29) driven by the electric motor (27). To release the braking state by the braking device (8). In this automatic closing device, when the brake releasing operation part (closing lever 29) in motion turns on the microswitches (MS1 to MS3), the brake releasing lever (closing lever 29) causes the brake release lever (closing lever 29) to turn on. 21) is considered to be pushed to the brake release position, and the drive of the electric motor (27) is stopped.

  According to the prior art, the brake release lever (21) is deformed beyond the movable limit due to excessive movement of the brake release operation part (close lever 29), or conversely, the brake release operation part (close lever 29). It is necessary to precisely adjust the amount of movement of the brake release operation portion (closing lever 29) so that it does not move until the brake release lever (21) is released and the amount of movement is insufficient. is there. In addition, the brake release position of the brake release lever (21) may differ depending on individual differences and types of the brake device (8), and accordingly, the amount of movement of the brake release operation portion (close lever 29) is changed. There is also a need to adjust. Therefore, considerable time and high technology are required for the adjustment work of the movement amount of the brake release operation portion (closing lever 29).

Therefore, for example, when the current value of the electric motor (27) that is a drive source of the brake release operation unit (closing lever 29) becomes larger than a preset threshold value, the brake release operation unit (closing lever 29). ) Can be considered to have pushed the brake release lever (21) to the brake release position, and control to stop the drive of the electric motor (27) can be proposed.
However, in such control, the current value of the electric motor (27) changes depending on the temperature of the motor atmosphere, and there is a risk of causing a malfunction that stops the electric motor (27). More specifically, for example, when the motor ambient temperature is relatively low, the resistance value of the motor winding is also relatively low, so that the current value is relatively high. Therefore, when the current value exceeds the threshold value, there is a possibility of causing a malfunction that stops the electric motor (27).

  Therefore, for example, an invention is proposed in which the threshold value is corrected according to the temperature of the motor atmosphere. In this case, however, it is necessary to separately provide a temperature sensor such as a thermistor, and further improvements are made. Desired.

Japanese Patent Laid-Open No. 2005-76366

  This invention makes it an example of a subject to cope with such a problem. That is, it is possible to eliminate the need for adjustment of the amount of movement of the brake release operation unit, to prevent excessive movement of the brake release operation unit and shortage of the movement amount, and to stably operate the brake release operation unit hardly affected by temperature changes. It is an object of the present invention to be controllable, to have a simple structure that does not require a temperature sensor.

One means for solving the above problems is driven by an electric motor, an opening / closing body capable of closing operation, a braking section for braking the closing operation of the opening / closing body and releasing the braking state by an operation on the braking operation section. An opening / closing device comprising: an automatic closing device that releases the braking operation unit by a braking release operation unit; and a current detection unit that detects a current value of the electric motor , wherein the input voltage of the electric motor is detected. A voltage detection unit, and when the change width of the voltage detected by the voltage detection unit within a predetermined time exceeds a predetermined voltage difference during the release operation of the brake release operation unit by driving the electric motor, the releasing operation portion returns to the initial position, otherwise, rise of the current value detected by the current detection unit, on the condition that exceeds a preset threshold width, the electric And performing control to stop the Ta.

Since the present invention is configured as described above, the following effects can be obtained.
For example, when the current value of the electric motor becomes larger than a preset threshold value, control that stops the electric motor causes the current value to increase due to a decrease in the motor ambient temperature. Although there is a possibility of causing a malfunction that the electric motor stops, according to the present invention, the electric motor is stopped depending on whether or not the increase range (difference value) of the current value of the electric motor exceeds the threshold width. Therefore, it is not easily affected by temperature changes.
Therefore, adjustment of the amount of movement of the brake release operation unit can be eliminated, excessive movement of the brake release operation unit and insufficient movement amount can be prevented, and the operation of the brake release operation unit is hardly affected by temperature changes. It can be controlled stably.
In addition, if the threshold width is corrected according to the current value detected by the current detection unit, highly accurate control according to the ambient temperature of the electric motor can be performed without using a temperature sensor. Is possible.

It is a front view which shows an example of the switchgear concerning this invention. It is sectional drawing which shows an example of a braking part. It is an internal structure figure showing an example of an automatic closing device, and shows the state where a brake release operation part is in an initial position. It is the (IV)-(IV) sectional view taken on the line of FIG. It is an internal structure figure of the automatic closure device, and shows the state where the brake release operation part advanced. It is a block diagram of an automatic closing device and a switch. It is a flowchart which shows an example of the control action by a control part. In the figure, a hexagonal frame indicates a conditional branch. It is an example of table data. It is an example of a function expression. It is a graph which shows the relationship between elapsed time and the electric current value of an electric motor, and has shown the case where atmospheric temperature is 20 degreeC and -20 degreeC. It is a graph which shows the relationship between the elapsed time at the time of no load, and the electric current value of an electric motor for every different atmospheric temperature. It is a flowchart which shows the other example of control operation by a control part.

  In one mode for carrying out the present invention, the opening / closing body capable of closing operation, a braking portion for braking the closing operation of the opening / closing body and releasing the braking state by an operation on the braking operation portion, and an electric motor are used. An opening / closing device comprising: an automatic closing device that releases the braking operation unit by a braking release operation unit; and a current detection unit that detects a current value of the electric motor, wherein the braking release by driving of the electric motor is performed. During the release operation of the operating unit, control is performed to stop the electric motor when the increase width of the current value detected by the current detecting unit exceeds a preset threshold width.

  Further, in order to reduce malfunctions, the control is performed after a predetermined current value fluctuation range at the start of the electric motor is passed.

  In order to enable more accurate control, the threshold width is corrected in accordance with the current value detected by the current detection unit.

  Furthermore, in order to perform better control, when the current value detected by the current detection unit changes from falling to rising, the threshold width is set according to the current value detected immediately before the change. to correct.

  Furthermore, in order to easily determine a correction value for correcting the threshold width, a function indicating a relationship between the current value and the correction value is set in advance, and corresponds to the current value detected by the current detection unit. The correction value is obtained from the function, and the threshold width is corrected based on the correction value.

  Further, in the specific means for obtaining the correction value, the function corresponds to a plurality of types of current value ranges selected according to the current value detected by the current detection unit, and for each current value range. Table data having correction values to be corrected.

  In another specific means for obtaining the correction value, the function is a function equation for calculating the correction value by substituting the current value detected by the current detection unit.

  In the present embodiment, the “opening / closing body thickness direction” means the thickness direction of the opening / closing body in the closed state. The “opening / closing body width direction” means a direction orthogonal to the opening / closing direction of the opening / closing body and not the thickness direction of the opening / closing body. In addition, the “opening / closing body opening / closing direction” means a direction in which the opening / closing body slides to open / close an opening or a space.

Hereinafter, preferred specific examples of the above-described embodiments of the present invention will be described in detail with reference to the drawings.
This opening / closing device is disposed in an opening or internal space of a building or the like, and can be applied as a shutter device that opens and closes the opening or internal space. It is effective when applied to a fire shutter device that automatically closes and prevents the spread of fire and smoke.

FIG. 1 is a schematic configuration diagram of a switchgear 1 according to the present invention.
The opening / closing apparatus 1 surrounds and guides an opening / closing body 10 that slides in an opening / closing body opening / closing direction (vertical direction in the drawing) and an opening / closing operation, and an end of the opening / closing body 10 in the width direction (horizontal direction in the drawing). A guide rail 20 and a winding device 30 that winds or unwinds the opening / closing body 10 on its opening direction side are provided.

  The opening / closing body 10 has a plurality of slats 11 formed by bending a horizontally-long substantially rectangular fireproof metal plate arranged in parallel in the opening / closing body opening / closing direction, and rotates between adjacent slats 11, 11. The seat plate 12 is connected to the closing direction end of the slat 11 closest to the closing direction end.

  The guide rail 20 is a member having a substantially U-shaped cross-section surrounding the widthwise end of the opening / closing body 10, and a contact target portion (for example, a floor surface, the ground, a frame member, etc.) seated by the opening / closing body 10 and a winding. It is arrange | positioned over the taking device 30. FIG.

  The winding device 30 includes a winding shaft 31 that winds and unwinds the opening / closing body 10, and an opening / closing machine 32 that drives and rotates and brakes the winding shaft 31 via power transmission means such as a chain and a sprocket. And an automatic closing device 33 for automatically closing the opening and closing body 10 by releasing the braking state by the opening and closing machine 32.

  The opening / closing machine 32 is an opening / closing machine having a known structure disclosed in, for example, Japanese Utility Model Publication No. 01-118084. More specifically, as shown in FIG. 2, a driving unit 32a for rotating the winding shaft 31 is provided. A braking portion 32b (brake device) that brakes rotation by the driving portion 32a is provided on one end side (right end side in the illustrated example) of the driving portion 32a.

  The drive unit 32a is a direct current motor or an alternating current motor. A drive shaft 32a2 is fixed to the center of the rotor 32a1, and the rotational force on one end side (the left end side in FIG. 2) of the drive shaft 32a2 is used as the power. Transmission is made to the take-up shaft 31 via transmission means (for example, a chain and sprocket, a belt and pulley, a gear, etc.). A substantially disc-shaped brake shoe 32a3 is fixed to the other end side (right end side in FIG. 2) of the drive shaft 32a2 so as to receive a braking force from the braking portion 32b.

The braking unit 32b is configured to brake the closing operation of the opening / closing body 10 by driving the driving unit 32a and to release the braking state by operating the braking operation unit 32b4.
More specifically, the brake portion 32b is fixed to the brake shaft 32b1 arranged so as to be arranged substantially linearly with respect to the drive shaft 32a2, the drive portion side of the brake shaft 32b1, and the brake shoe 32a3. The brake drum 32b2 that is detachably contacted with the coil drum 32, the coil spring 32b3 that urges the brake drum 32b2 in the direction of the drive unit 32a (leftward according to FIG. 2), and the urging force of the coil spring 32b3 And an electromagnetic solenoid 32b6 that attracts the brake drum 32b2, and a braking operation portion 32b4 for manually separating the brake drum 32b2 from the brake shoe 32a3 against the urging force of the coil spring 32b3.

The braking operation portion 32b4 is a substantially bowl-shaped member configured to pull the brake shaft 32b1 and the brake drum 32b2 away from the brake shoe 32a3 by a swinging force acting on one end side, and is mechanically operated by an automatic closing device 33 described later. Is pushed.
Reference numeral 32b5 in the figure denotes a chain provided so that the opening / closing body 10 can be manually opened and closed, and can be omitted as necessary.

  As another example, when the opening / closing device 1 is used only by its own weight or manual opening / closing, the braking unit 32b for braking the rotation of the driving shaft 32a2 by omitting the driving unit 32a (motor) from the opening / closing machine 32. (And a manual drive mechanism or the like) may be the main component.

And the opening / closing machine 32 of the said structure is provided with the closing operation | movement detection part 32c for detecting that the opening / closing body 10 started closing operation (refer FIG. 6).
When the opening / closing body 10 starts the closing operation from the fully open position, the closing operation detection unit 32c operates the micro switch by the rotational force of the drive shaft 32a2 of the opening / closing device 32, and outputs a contact signal of the micro switch. It is supposed to be configured.

The automatic closing device 33 is a mechanism for releasing the braking operation portion 32b4 by a braking release operation portion 33f driven by the electric motor 33a (see FIGS. 3 to 6).
More specifically, the automatic closing device 33 includes an electric motor 33a serving as a driving source, a gear box 33b that appropriately adjusts and transmits the rotational force of the electric motor 33a using a plurality of gears, and the gear box. A one-way clutch 33c provided on the output shaft of 33b to prevent reverse rotation; a pinion 33d provided to receive rotational force from the one-way clutch 33c; and a solenoid 33e for releasing the reverse-rotation prevention state of the one-way clutch 33c; Whether the brake release operation unit 33f that moves forward and backward by engaging the rack with the pinion 33d, the current detection unit 33g (see FIG. 6) that detects the load value of the electric motor 33a, and the brake release operation unit 33f are in the initial position. An initial position detector 33h that detects whether or not, and a voltage detector 33i that detects an input voltage of the electric motor 33a. , And a control circuit unit 33x for controlling the electric motor 33a and a solenoid 33e in response to the detection signal and the like of the detection unit.

  The electric motor 33a is a DC motor. The electric motor 33a is driven or stopped by controlling the supplied power by the control circuit unit 33x.

  The one-way clutch 33c is a well-known mechanism that transmits a rotational force only in one direction, and according to the present embodiment, the reverse rotation prevention state is released by the solenoid 33e. In this configuration, for example, the one-way clutch 33c may be a mechanism (so-called ratchet mechanism) composed of pawls and gears, and the pawls may be separated by the electromagnetic force of the solenoid 33e.

  The brake release operation portion 33f includes a slide portion 33f1 that slides through the casing 33k, a stopper portion 33f2 that regulates the amount of advancement of the slide portion 33f1, and a detection target 33f3 that is detected by an initial position detection portion 33h described later. And a contact portion 33f4 that is brought into contact with the braking operation portion 32b4 at the front end portion of the slide portion 33f1.

  According to the illustrated example, the slide portion 33f1 is a substantially L-shaped rod, and has a rack 33f11 that engages with the pinion 33d in the slide direction.

The stopper portion 33f2 is a protrusion that is integral with the slide portion 33f1, and when the slide portion 33f1 moves forward, the stopper portion 33f2 comes into contact with a non-moving portion in the casing 33k to restrict the amount of advancement of the slide portion 33f1.
The slide portion 33f1 is provided with a plurality of screw holes for screwing the stopper portion 33f2 at intervals in the slide direction, and the advance amount of the slide portion 33f1 can be adjusted by changing the position of the stopper portion 33f2. ing.

  The detected body 33f3 is fixed to the slide portion 33f1 so that it is detected by the initial position detection portion 33h (limit switch) when the slide portion 33f1 moves backward (moves to the left in the illustrated example). It is a protrusion. The detected body 33f3 is fixed to the slide portion 33f1 by a fastening member such as a screw or a bolt, and the position of the slide direction relative to the slide portion 33f1 can be adjusted by loosening the fastening member.

The abutting portion 33f4 is a portion that abuts on the braking operation portion 32b4 when moving forward, and is configured so that the position in the advancing / retreating direction can be adjusted.
More specifically, the contact portion 33f4 includes an adjustment bolt 33f41 screwed in parallel with the slide direction of the slide portion 33f1 at the front end of the slide portion 33f1, and a lock nut 33f42 for fixing the position of the adjustment bolt. The bolt head portion of the adjustment bolt 33f41 is in contact with the braking operation portion 32b4. According to the contact portion 33f4, the adjustment bolt 33f41 is rotated to advance and retract the aforementioned bolt head portion, whereby a clearance between the brake release operation portion 33f at the initial position and the brake operation portion 32b4 at the initial position. S can be finely adjusted.

  Then, the braking release operation unit 33f configured as described above moves forward by the rotation of the pinion 33d driven by the electric motor 33a. Further, the brake release operation portion 33f moves backward by the urging force of the urging member 33l when the reverse rotation prevention state of the one-way clutch 33c is released by the operation of the solenoid 33e. The biasing member 33l is a tension spring, and one end thereof is fixed to the slide portion 33f1 and the other end thereof is fixed to a stationary part of the casing 33k. The biasing member 33l can be replaced with a mode using a compression spring or a leaf spring.

  The current detection unit 33g (see FIG. 6) may be configured to output a signal corresponding to the current value of the electric motor 33a. According to the example of the present embodiment, the current detection unit 33g detects the current value of the electric motor 33a. A current sensor is used. For example, the current sensor may be a mode using a Hall element or another known mode. The current value signal output from the current detection unit 33g is input to the control circuit unit 33x described later.

The initial position detection unit 33h may be configured to output a signal when the brake release operation unit 33f reaches the initial position (the state shown in FIG. 3), and more specifically, the brake release operation at the initial position. A position sensor that senses the part 33f by contact or non-contact may be used. According to the illustrated example, the position sensor is a limit switch, and outputs a contact signal by being in contact with the detected body 33f3 of the braking release operation unit 33f. A signal output from the initial position detection unit 33h is input to a control circuit unit 33x described later (see FIG. 6).
In addition, according to the example shown in FIG. 3, two limit switches as the initial position detection unit 33h are used in parallel, one of the signals is input to the control circuit unit 33x, and the other signal is output to the outside. It is like that.

  The voltage detector 33i (see FIG. 6) may be configured to detect an input voltage of the electric motor 33a and output a signal corresponding to the detected voltage. For example, a voltage sensor (or voltmeter) having a known structure is used. That's fine. A signal output from the voltage detection unit 33i is input to a control circuit unit 33x described later.

The control circuit unit 33x is an electronic circuit (a so-called microcomputer circuit or the like) that causes the central processing unit (CPU) to function based on a program stored in a storage device (not shown), and is input via the connector 33m during a disaster or the like. The electric motor operates in response to the automatic closing signal, processes the signals input from the closing operation detection unit 32c, the current detection unit 33g, the initial position detection unit 33h, and the voltage detection unit 33i, and according to the processing result, the electric motor 33a and solenoid 33e are controlled.
The control circuit unit 33x stores in advance a function (see FIG. 8 or FIG. 9) indicating the relationship between the current value and the correction value in the storage device, and allows the central processing unit to function to detect current. A correction value corresponding to the current value detected by the unit 33g is obtained from the function, and a threshold width described later is corrected based on the correction value.

  Next, an example of control by the control circuit unit 33x will be described in detail based on the flowchart shown in FIG.

First, in step 1, the automatic closing device 33 is turned on in response to an automatic closing signal input at the time of a disaster or the like.
As a preferred example of the power source of the automatic closing device 33, the automatic closing signal may be a voltage signal, and the voltage signal may be used as a power source.

  In the next step 2, it is determined whether or not the brake release operation unit 33f is at the initial position based on the detection signal from the initial position detection unit 33h. If it is in the initial position, the process proceeds to the next step 3. Otherwise, the process proceeds to step 2a to operate the solenoid 33e.

  In step 2a, the one-way clutch 33c is released from the reverse rotation prevention state by the operation of the solenoid 33e, the braking release operation portion 33f is forcibly returned to the initial position by the urging force of the urging member 33l, and the processing is returned to step 2.

  That is, immediately after the power of the automatic closing device 33 is turned on, if the brake release operation unit 33f is not in the initial position, the brake release operation unit 33f is forcibly returned to the initial position and driven by the electric motor 33a. The release operation of the brake release operation unit 33f can be automatically redone. Therefore, it is possible to prevent the erroneous determination in Step 10 to be described later due to an increase in the current value due to the operation from the middle position of the brake release operation unit 33f, and to stably control the brake release operation unit 33f. be able to.

  In step 3, a variable indicating a minimum current value, which will be described later, is set to an initial value. The initial value of the minimum current value is a value that is appropriately set based on experiments or calculations in advance so as to be higher than the detected current after a sudden current fluctuation at the start, and the control circuit unit 33x Is stored in a storage device (not shown).

Further, in step 4, the brake release operation unit 33f starts moving forward by the operation of the electric motor 33a, and the current value of the electric motor 33a is started to be measured by the current detection unit 33g.
More specifically, the control circuit unit 33x detects the current value by the current detection unit 33g at a predetermined sampling interval (for example, every 2 ms), and a predetermined number (for example, five) detected sequentially. An average value (hereinafter referred to as a detected current average value) is calculated for the current value, and the calculation of the detected current average value is repeated every time a predetermined time elapses. That is, a so-called moving average method is performed.

Here, the change in the current value of the electric motor 33a will be described. For example, when the ambient temperature is 20 ° C., as shown in the lower curve of FIG. In b (about 0.2 seconds according to the illustrated example), a sudden change (increase / decrease) in the current value occurs due to the starting current. That is, immediately after the electric motor 33a is energized, the current value suddenly rises to the peak current p and falls abruptly.
In the subsequent time ranges b to c, the brake release operation unit 33f is moving in the gap S before contacting the braking operation unit 32b4, and the current value becomes a substantially constant no-load current.
In the next time range c to d, the brake release operation unit 33f is pushing the brake operation unit 32b4 until it reaches the operation limit position, and the current value rapidly increases.
Further, in the next time range de, the braking operation unit 32b4 stops at the operation limit position, so that a lock current flows through the electric motor 33a, and the current value increases more rapidly.
Then, after time e, the power supply to the electric motor 33a is cut off, and the current value suddenly drops to a state of approximately 0 mA.

Further, when the ambient temperature is relatively low, the winding resistance value also becomes relatively low as the winding temperature decreases, so that the current value of the electric motor 33a becomes relatively large. For example, as shown in FIG. 10, the current value is generally higher when the ambient temperature is −20 ° C. than when the ambient temperature is 20 ° C.
As described above, when the temperature is relatively low (for example, at −20 ° C.), the peak current immediately after energization of the electric motor 33a is compared with that when the temperature is relatively high (for example, at 20 ° C.). Since it takes time for the current value to drop after reaching p ′ (see the range of T _L in FIG. 10), the time point before the current value has completely dropped and stabilized (according to c ′ in FIG. 10). At the time), the braking operation portion 32b4 is started to be pushed by the braking release operation portion 33f. As a result, the current value increase width H _L due to the pushing is smaller than the current value increase width H _S when the temperature is relatively high (for example, at 20 ° C.).
As described above, as shown in the graph of FIG. 11, the time until the current value rapidly increased by the starting current drops and stabilizes tends to increase as the temperature decreases.

Returning to the description of the flowchart again, in step 5, it waits for a predetermined time to elapse. This waiting time (predetermined time) is set so as to include an abrupt current value fluctuation range at the start of the electric motor 33a (range a to b according to FIG. 10).
That is, according to this step 5, after the predetermined current value fluctuation range at the start of the electric motor 33a is passed, the control after step 6 described later is performed.

In step 6, it is determined whether or not there is a sudden change in the input voltage of the electric motor 33a based on the input signal from the voltage detector 33i. If the sudden change occurs, the process proceeds to the next step 7. If not, the process proceeds to step 2a to operate the solenoid 33e.
Here, the determination as to whether or not there has been a sudden change in the input voltage of the electric motor 33a is more specifically described. The change width of the detection voltage measured by the voltage detection unit 33i within a predetermined time is a predetermined voltage. What is necessary is just to judge whether the difference was exceeded. The predetermined voltage difference may be set by using, for example, a voltage difference generated when the power source of the automatic closing device 33 is switched from a commercial power source to a battery power source.
As another example, in order to determine whether or not the input voltage of the electric motor 33a has suddenly changed, the detection voltage measured by the voltage detection unit 33i is less than or equal to a predetermined voltage value. It is also possible to determine whether or not.

  Therefore, according to the step 6, during the release operation of the brake release operation unit 33f, for example, the power supply of the automatic closing device 33 is switched from the commercial power supply to the battery power supply, so that the input voltage of the electric motor 33a changes suddenly. If there is, the brake release operation unit 33f is forcibly returned to the initial position. Therefore, it is possible to prevent the erroneous determination in Step 10 described later due to the current value variation based on the voltage variation, and to stably control the brake release operation unit 33f.

In step 7, it is determined whether or not the detected current average value is larger than the minimum current value set in the past. If it is larger, the process proceeds to the next step 8, and if not, the process proceeds to step 7a. Later on the migration.
Here, the initial value of the minimum current value is the value set in step 3.

  In the next step 7a, the minimum current value is updated to the latest detected current average value, and the process returns to step 6.

That is, according to the loop of step 7 to step 7a, for example, in the range T _L where the current value gradually decreases after the starting current, as shown in the curve in the case of the ambient temperature −20 ° C. in FIG. At a predetermined time interval, the minimum current value is updated to a smaller value.
When the current value detected by the current detection unit 33g changes from a decrease to an increase (at time c ′ in FIG. 10), this is determined in step 7, and the subsequent processing proceeds to step 8. To do. Therefore, the detected current average value immediately before the change becomes the final minimum current value.

In step 8, a correction value corresponding to the final minimum current value determined as described above is obtained from the table data (function) shown in FIG.
Further, in step 9, a threshold width corrected based on the correction value is obtained.

The table data of FIG. 8 includes a plurality of types of current value ranges (in the illustrated example, five types of minimum current ranges) selected according to the minimum current value, and correction values corresponding to the current value ranges. And a threshold value corresponding to each of these current value ranges and correction values. This table data is obtained in advance by experiment or calculation, and is stored in a storage device (not shown) of the control circuit unit 33x.
For example, if the final minimum current value is 320 mA, it is included in the second-stage minimum current range (300 to 349 mA) shown in FIG. 8, so the correction value is 30 mA, and the threshold width is 90 mA.
Here, the threshold width is calculated by a calculation formula of “specified value (120 mA in the illustrated example) −correction value (30 mA)”. The specified value is a value obtained in advance by experiment or calculation.

  In the embodiment, the threshold width is calculated in advance and stored as a part of the table data. However, as another example, the threshold width data is omitted from the table data, and control is performed. The threshold value may be calculated every time the circuit unit 33x selects the current value range and the correction value.

As another example of the function for obtaining the correction value, the function expression “y = ax−b” shown in FIG. 9 may be used instead of the table data.
The function expression “y = ax−b” shown in FIG. 9 is a linear expression obtained by statistically calculating in advance the change rate a (for example, 0.2) and the constant b (for example, 30) of the correction value through experiments or the like. Yes, and stored in a storage device (not shown) of the control circuit unit 33x. The rate of change a and the constant b are different values depending on the capacity of the electric motor 33a.
In this other example, the control circuit unit 33x causes the central processing unit to function, thereby substituting the minimum current value x into the function formula and calculating the correction value y.

Next, in step 10, it is determined whether or not the difference between the latest detected current average value and the minimum current value is larger than the threshold width obtained in step 9. If not, the process returns to step 6.
For example, as shown by the curve in the case of the atmospheric temperature of −20 ° C. in FIG. 10, the current value detected by the current detection unit 33 g changes from a decrease to an increase, and the increase amount is the threshold obtained in step 9. If the width is greater than the width, the process proceeds to the next step 11. If the amount of increase does not exceed the threshold width, the processing between step 6 to step 10 is repeated until the threshold width is exceeded.

Next, at step 11, the electric motor 33a is stopped.
According to this operation, the braking operation unit 32b4 is pushed by the braking release operation unit 33f, and the electric motor 33a is stopped in a state in which the braking unit 32b is released. With this stop, the braking release operation unit 33f is stopped. And the movement of the braking operation part 32b4 is also stopped (the state shown in FIG. 5 is obtained).

  In step 12, after the electric motor 33 a is stopped, the process waits for a predetermined time (2 seconds in the illustrated example) to elapse, and the process proceeds to the next step 13. This waiting time (predetermined time) is a time for waiting for a feedback signal (detection signal) of the closing operation detection unit 32c output when the brake of the braking unit 32b is released.

  In the next step 13, the presence or absence of a detection signal by the closing operation detection unit 32 c is determined. If there is a detection signal, the electric motor 33 a is kept stopped and the flowchart is ended. The process proceeds to 2a and the solenoid 33e is operated.

  Therefore, for example, when the brake release operation unit 33f or other operation location is caught, the state is recognized by the absence of the detection signal from the closing operation detection unit 32c, and the brake release operation by the brake release operation unit 33f is recognized. Can be redone automatically. As a result, it is possible to prevent the malfunction caused by mechanical catching and to stably control the brake release operation unit 33f.

Next, another control example of the switchgear according to the present invention will be described.
The control example shown in FIG. 12 has a configuration in which steps 7 and 7a are changed to steps 7 ′ and 7a ′ with respect to the control example shown in FIG. Hereinafter, the changed part will be described in detail.

In step 7 ′ of FIG. 12, it is determined whether or not the average current value detected by the current detector 33g is larger than the minimum current value set in the past. If so, the process proceeds to the next step 7a ′. If not, the process jumps to Step 8.
Here, the concept of the detected current average value and the minimum current value is the same as that described in step 7 described above.

In step 7a ′, the minimum current value is updated to the latest detected current average value, and the process proceeds to the next step 8.
In Steps 8 to 10, as in the control example of FIG. 7 described above, a process for obtaining a correction value based on the minimum current value, a process for obtaining a threshold width, and determining whether or not the current value increase width exceeds the threshold width. The process to perform is performed.

That is, in the control example of FIG. 7 described above, when the detected current is decreasing (in the range of T _L according to FIG. 10), only the update of the minimum current value is performed, and when the increase of the detected current is confirmed, A minimum current value is determined, a correction value and a threshold width are obtained based on the minimum current value, and it is determined whether or not the current value increase width exceeds the threshold width.
On the other hand, in the control example of FIG. 12, every time the detection current average value is calculated while the detection current is decreasing (in the range of T _L according to FIG. 10), the correction value and A threshold width is obtained, and it is determined whether or not the current value increase width exceeds the threshold width.

  Note that, according to the above-described embodiment, the determination as to whether or not the current value increase width exceeds the threshold width is performed after the sudden current fluctuation range at the start of the electric motor 33a. For example, when the voltage control at the time of starting (for example, the control for gradually increasing the voltage) is configured so as not to cause a sudden current value fluctuation at the time of starting as in the illustrated example, the above determination is made over the entire time range. Can be performed (ie, step 5 is omitted).

Further, according to the above-described embodiment, as a particularly preferable aspect, the clearance S is provided between the braking release operation portion 33f at the initial position and the braking operation portion 32b4 at the initial position. However, as another example, a configuration in which the gap S is not provided is also possible.
As another example, it is possible to connect the brake release operation unit 33f and the brake operation unit 32b4. In this case as well, the brake release operation unit 33f and the brake operation unit 32b4 correspond to the gap S. Although it is preferable to connect so that it has shakiness, it is also possible to make it the connection which does not have shakiness.

  In addition, according to the above-described embodiment, as a particularly preferable aspect, the condition that the brake release operation unit 33f is returned to the initial position is set such that the brake release operation unit 33f is not in the initial position (step 2) and there is a voltage fluctuation. (Step 6) and the presence of a closing operation detection signal (Step 13). However, as other examples, these conditions can be omitted as appropriate, or other conditions can be added.

Further, as another example of the closing operation detection unit 32c, a contact type or a non-contact type provided in a non-moving part such as the guide rail 20 so as to detect the opening / closing body 10 when the closing operation is started from the fully opened position. A sensor (for example, a micro switch, a proximity switch, a phototube switch, or the like) may be used.
Furthermore, as another example of the closing operation detection unit 32c, a configuration in which the closing operation of the opening / closing body 10 is detected from a change in the load value (current value, etc.) of the opening / closing device 32 can be adopted.

Further, as another preferable mode not shown in the drawings, in the above embodiment, the number of times the brake release operation unit 33f is returned to the initial position and the brake release is restarted is limited to a predetermined number, and the number exceeds the predetermined number. In such a case, the electric motor 33a may be stopped abnormally.
More specifically, this aspect includes a counting unit that counts the number of actuations of the solenoid 33e. If the count number by the counting unit is within a predetermined number of times, the solenoid 33e is activated (step 2a). When the count by the counting means exceeds the predetermined number, it is judged as an abnormal state, the power supplied to the electric motor 33a is cut off without operating the solenoid 33e, and a failure lamp is turned on as necessary. Alternatively, an alarm output such as blinking may be performed.

  Moreover, in the said embodiment, although it was set as the form which wound up and accommodated the opening / closing body 10 on the winding shaft 31, as an other example, it is an opening direction, without winding the opening / closing body 10 around the winding shaft 31. It is also possible to adopt a form that is housed on the side.

  Another example of the opening / closing body 10 is an opening / closing body formed by connecting a plurality of panels made of non-combustible material or a material that is difficult to be thermally deformed in the opening / closing direction. It is also possible to make an opening / closing body composed of a panel having a possible area, an opening / closing body composed of a non-flammable, flame-retardant, fire-resistant sheet, or an opening / closing body appropriately combined with slats, panels, sheets, etc. is there.

The braking unit 32b may be configured to brake the closing operation of the opening / closing body 10 and to release the braking state by an operation on the braking operation unit 32b4. According to the illustrated example, the braking operation unit 32b4 is pushed and moved. Although the configuration is such that the braking state is released by an operation, as another example, a configuration in which the braking state is released by an operation in which the braking operation unit is pulled may be employed.
Further, as another example of the braking unit, a configuration in which a brake pad or the like is brought into sliding contact with the winding shaft 31 or the opening / closing body 10 to brake the closing operation of the opening / closing body 10 may be employed.

  Moreover, according to the said embodiment, although the automatic closing device 33 was set as the structure which cancels | releases the braking operation part 32b4 by the linear pushing of the braking cancellation | release operation part 33f, Also, it is possible to adopt a mode in which the braking operation unit is released by a curvilinear motion or a circular motion of the braking release operation unit, a mode in which the braking operation unit is released by a pulling operation, or the like.

  Further, according to the embodiment, the function formula (see FIG. 9) is a linear formula. However, as another example, the function formula may be a curved formula or the like.

DESCRIPTION OF SYMBOLS 1: Opening / closing device 10: Opening / closing body 32: Opening / closing machine 32a: Drive part 32b: Braking part 32b4: Braking operation part 33: Automatic closing device 33a: Electric motor 33f: Braking release operation part 33g: Current detection part

Claims (10)

An opening / closing body capable of closing operation, a braking section for braking the closing operation of the opening / closing body and releasing the braking state by an operation on the braking operation section, and a braking release operation section driven by an electric motor An opening / closing device comprising an automatic closing device for releasing operation, and a current detection unit for detecting a current value of the electric motor,
A voltage detector for detecting an input voltage of the electric motor;
During the release operation of the brake release operation unit by driving the electric motor , when the change width within a predetermined time of the voltage detected by the voltage detection unit exceeds a predetermined voltage difference, the brake release operation unit is moved to the initial position. If not, control is performed to stop the electric motor on condition that the increase width of the current value detected by the current detection unit exceeds a preset threshold width. Opening and closing device. An initial position detection unit that detects that the braking release operation unit is in the initial position,
Immediately after the power of the automatic closing device is turned on, when it is determined that the brake release operation unit is in the initial position based on the detection signal of the initial position detection unit, the brake release operation is performed by driving the electric motor. 2. The opening / closing device according to claim 1 , wherein a release operation of the part is started, and if not, the brake release operation part is returned to the initial position . A one-way clutch that transmits only the rotational force in one direction of the electric motor to release the brake release operation unit, a solenoid that releases the reverse rotation prevention state of the one-way clutch, and the brake release operation unit at an initial position. An urging member to be returned,
2. The brake release operation unit is returned to the initial position by the urging force of the urging member by releasing the reverse rotation preventing state of the one-way clutch by the electromagnetic force of the solenoid. The switchgear according to 2 . The switchgear according to any one of claims 1 to 3, wherein the predetermined voltage difference is a voltage difference generated when the power source of the automatic closing device is switched from a commercial power source to a battery power source . The switchgear according to any one of claims 1 to 4, wherein the automatic closing device is turned on in response to an automatic closing signal input at the time of a disaster . 6. The gap according to claim 1, wherein a gap is provided between the brake release operation unit at the initial position and the braking operation unit at the initial position, and the gap can be adjusted. Switchgear. The switchgear according to any one of claims 1 to 6, wherein the control is performed after a predetermined current value fluctuation range at the start of the electric motor is passed . The threshold width is corrected according to the current value detected immediately before the change when the current value detected by the current detection unit changes from falling to rising. The switchgear according to any one of 1 to 7 . A function indicating a relationship between the current value and the correction value is set in advance, the correction value corresponding to the current value detected by the current detection unit is obtained from the function, and the threshold width is corrected based on the correction value. And
The function is table data having a plurality of types of current value ranges selected according to the current values detected by the current detection unit, and correction values corresponding to the current value ranges. The switchgear according to claim 8, characterized in that: A function indicating a relationship between the current value and the correction value is set in advance, the correction value corresponding to the current value detected by the current detection unit is obtained from the function, and the threshold width is corrected based on the correction value. And
The switchgear according to claim 8, wherein the function is a function formula that calculates a correction value by substituting a current value detected by the current detection unit.

Images