JP2011106141A - Opening/closing device and method for correcting threshold thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably correct a threshold without increasing the number of components. <P>SOLUTION: This opening/closing device includes: an opening/closing body A1 which makes a closing movement by selfweight; a braking part 4 which brakes the closing movement of the opening/closing body A1 by the selfweight; a braking operation part 5 which operates to release the braking of the braking part 4; a braking-release operation part 6 which operates to make the braking operation part 5 release braking; a control part 76 which controls so as to stop the braking-release operation of the braking-release operation part 6 when an operation current value exceeding the predetermined threshold is detected during the braking-release operation of the braking-release operation part 6; and an operation-current-value detection part 72 which outputs an operation-current-value signal by detecting the magnitude of the operation current value. Additionally, the control part 76 is equipped with control for correcting the threshold to a threshold set to correspond to every magnitude of the operation current value on the basis of the output operation current value signal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an opening / closing device having an automatic closing function of an opening / closing body and a threshold value correction method for the opening / closing device.

  An opening / closing device includes an opening / closing body capable of being closed by its own weight, a braking device for braking and releasing the opening / closing body so as not to be closed by its own weight, and an automatic closing device for releasing braking of the braking device. The one with is known. An open / close device equipped with such an automatic closing device prevents the spread of fire and smoke from fire by causing the open / close body to close by its own weight by releasing the braking of the braking device when a fire occurs. It has become.

  In the one described in Patent Document 1 below, the brake release lever provided in the braking device is released in the braking release direction by moving the closing lever provided in the automatic closing device in the braking release direction. It has become. In addition, when the moving brake release operation unit turns on the micro switch, a signal indicating that the brake operation unit is pushed to the brake release position is output, and the electric motor that moves the brake release operation unit based on this signal Is controlled to stop driving.

  According to the prior art of Patent Document 1, it is possible to increase the accuracy of the brake release operation of the brake release operation unit by controlling the brake release operation unit to stop at the brake release position of the brake operation unit. However, since the movement amount of the brake release operation unit needs to be adjusted with high accuracy in order to prevent deformation and breakage of the brake operation unit due to excessive movement, it corresponds to the adjustment work of the movement amount of the brake release operation unit. Time and high technology are required. In addition, since the braking release position of the braking operation unit may differ depending on the braking device, the amount of movement of the braking release operation unit must be adjusted for each braking device. That is, the adjustment of the movement amount of the brake release operation unit is a factor that reduces the construction efficiency of the switchgear.

  Therefore, as described in Patent Document 2 below, a change in the current value of the drive source is detected, and the drive source is driven when the detected current value exceeds a preset threshold value. It can be proposed to use a control to stop.

  When using the above-mentioned control for an automatic closing device, a specific value is set as a threshold value, and the fluctuation of the operating current value when the brake release operation unit pushes the braking operation unit is detected and detected. When the applied operating current value exceeds the above-described threshold value, it is possible to control to stop the driving of the driving unit, assuming that it is the movable limit of the braking release operation unit.

Japanese Patent Laid-Open No. 2005-76366 JP 2006-118232 A

  As shown in FIG. 12, the operating current value for operating the brake releasing operation unit changes with the change in the ambient temperature. Therefore, in order to perform the braking releasing operation with the threshold value, the operating current value of It is necessary to correct the threshold according to the change. As a means for correcting this threshold value, the ambient temperature is detected by using a hardware component such as a thermistor, and based on the detected ambient temperature, it is corrected to a threshold value corresponding to the operating current value that varies depending on the ambient temperature. Control to do is conceivable.

  However, in the above-described means, the number of parts is increased by using hardware parts such as a thermistor, and the increase in the number of parts may increase the cost and size of the switchgear.

  This invention makes it an example of a subject to cope with such a problem. That is, it is possible to correct a stable threshold value without increasing the number of parts, to prevent excessive movement of the brake release operation unit by correcting the stable threshold value, It is an object of the present invention to prevent deformation and breakage of the brake operation unit by preventing excessive movement, and to achieve cost reduction and downsizing of the switchgear by not increasing the number of parts.

  In order to achieve the above object, a switchgear and a threshold value correction method for a switchgear according to the present invention include at least the following configuration.

  An opening / closing body that closes due to its own weight, a braking portion that brakes the closing operation due to its own weight, a braking operation portion that operates to release braking of the braking portion, and a brake release for the braking operation portion A brake release operation unit that operates so as to perform the braking operation, and the brake release operation of the brake release operation unit is stopped when an operating current value exceeding a predetermined threshold is detected during the brake release operation of the brake release operation unit An opening / closing device including a control unit that controls the operation current value to detect the magnitude of the operation current value and to output an operation current value signal. And a control for correcting the threshold value to a threshold value set to correspond to each magnitude of the operating current value based on the operating current value signal.

  An opening / closing body that closes due to its own weight, a braking portion that brakes the closing operation due to its own weight, a braking operation portion that operates to release braking of the braking portion, and a brake release for the braking operation portion A brake release operation unit that operates so as to perform the braking operation, and the brake release operation of the brake release operation unit is stopped when an operating current value exceeding a predetermined threshold is detected during the brake release operation of the brake release operation unit And an operation current value detection step of detecting an operation current value signal and outputting an operation current value signal, and an output of the operation current value signal. And a threshold value correcting step for correcting the threshold value to a threshold value set so as to correspond to each magnitude of the operating current value.

  By having such characteristics, the present invention has the following effects. That is, since the threshold value is corrected to a value corresponding to the peak value based on the detected peak value of the inrush current value, the threshold value is corrected without increasing the number of components such as hardware components. By correcting the threshold value, it is possible to prevent an excessive operation of the brake release operation unit that performs a brake release operation of the brake operation unit, and to prevent an excessive operation of the brake release operation unit. It is possible to prevent deformation and breakage of the braking operation unit. Moreover, the cost and size of the switchgear can be reduced by not increasing the number of parts.

The schematic block diagram of 1st Embodiment of an opening / closing apparatus. The principal part expanded sectional view of FIG. Sectional drawing which shows the structure of an automatic closure apparatus. (4)-(4) sectional view taken on the line of FIG. Sectional drawing which shows the structure of the automatic closure apparatus of a brake release state. Sectional drawing which shows the structure of the automatic closure apparatus of other embodiment. (7)-(7) sectional view taken on the line of FIG. Sectional drawing which shows the structure of the automatic closure apparatus of a brake release state. The block diagram which shows the structure of an automatic closure apparatus. The wave form diagram which shows the operating current value from a braking state to a braking cancellation | release state. The flowchart which shows the control method of a control part. The wave form diagram which shows the change of the operating current value by ambient temperature.

  The opening / closing device of the present invention is disposed in an opening or an internal space of a building or the like, and can be applied as a shutter device for opening / closing the opening or the internal space. It is effective when applied to a fire shutter device that automatically closes the space and prevents fire spread and smoke spread.

  In addition, the opening / closing device of the present invention includes a form in which the opening / closing body is wound and stored on the winding shaft, and a form in which the opening / closing body is stored on the opening direction side without being wound on the winding shaft. .

  The above-mentioned opening / closing body preferably has a fireproof function, for example, an opening / closing body formed by connecting a plurality of slats or panels made of a non-combustible material or a material that is difficult to thermally deform in the opening / closing direction. Examples thereof include an opening / closing body made of a material and made of a panel having an area capable of fully closing an opening and an internal space, and an opening / closing body made of a non-flammable, flame retardant, and fire-resistant sheet.

  In the present invention, it is preferable that the magnitude of the operating current value is detected by detecting a peak value of the inrush current at the start of the braking release operation unit.

  Further, the detection of the movable limit of the braking operation unit according to the present invention may be limited to detect the operating current value at the movable limit of the braking operation unit based on the current value detected after the correction of the threshold value. preferable.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The opening / closing apparatus 1 of the present embodiment will be described with respect to a form applied to a fire-proof shutter device that automatically closes an opening and an internal space to prevent the spread of fire and smoke when a fire occurs. In addition, each embodiment illustrated below shows an example of the control method of the switchgear 1 and the switchgear 1, and does not limit this invention.

  In the present embodiment, the “opening / closing body thickness direction” means the thickness direction of the opening / closing body A1 in the closed state. The “opening / closing body width direction” means a direction orthogonal to the opening / closing direction of the opening / closing body A1 and not the thickness direction of the opening / closing body A1. In addition, the “opening / closing body opening / closing direction” means a direction in which the opening / closing body A1 slides to open / close an opening or a space.

  FIG. 1 is a schematic configuration diagram of the opening / closing device 1. The opening / closing device 1 surrounds an automatic closing device 10, an opening / closing body A1 that slides in an opening / closing body opening / closing direction (vertical direction in the drawing), and an opening / closing body width direction (left / right direction in the drawing). A guide rail A2 that guides to the side, a winding device A3 that winds and unwinds the opening and closing body A1, and a storage portion A4 that stores the winding device A3.

  The opening / closing body A1 is configured such that a plurality of slats A11 formed by bending a horizontally-long substantially rectangular fire-proof metal plate are juxtaposed in the opening / closing body opening / closing direction and rotated between adjacent slats A11. The seat plate A12 is connected to the closing direction end of the slat A11 on the closing direction end side.

  The guide rail A2 is a substantially U-shaped member that surrounds the widthwise end of the opening / closing body 1A, and a contact target portion (for example, a floor surface, the ground, a frame member, etc.) seated by the opening / closing body A1. It arrange | positions over between accommodating part A4.

  The winding device A3 includes a winding shaft A30 that winds and unwinds the opening / closing body A1, and an opening / closing device 2 that drives and rotates the winding shaft A30 via a power transmission unit A31 such as a chain and a sprocket. .

  The opening / closing machine 2 is provided with a braking device 3 that brakes the rotation of the winding shaft A30 in the closing direction due to the weight of the opening / closing body A1.

  The braking device 3 is braked at the time of standby, and is released by the automatic closing device 10. The automatic closing device 10 is controlled based on a fire signal output when a fire occurs. 3, the braking of the winding shaft A30 is released. The winding shaft A30 released from braking is rotated in the direction of closing the opening / closing body A1 by the weight of the opening / closing body A1 acting in the closing direction. The aforementioned fire signal output may be automatically output from the fire detection device when a fire occurs, or may be output artificially when a fire occurs.

  The storage portion A4 is formed in a box shape having an opening (not shown) for allowing the opening / closing body A1 to appear and disappear at the lower end, and the edge portion of the opening is the opening of the opening / closing body A1 when fully opened. It is a lintel (not shown) for contacting the seat plate member A12.

  FIG. 2 is a configuration diagram of the switch 2. The opening / closing machine 2 is built in a casing A5, and an automatic closing device 10 is attached to the upper part of the casing A5.

  As the opening / closing machine 2, for example, one having a structure disclosed in Japanese Patent Application Laid-Open No. 2009-79457 can be used. Hereinafter, the basic configuration of the switch 2 will be described.

  The opening / closing machine 2 includes a winding drive source 20 for rotating the winding shaft A30, and a braking device 3 for braking the rotation of the winding shaft A30 due to the weight of the opening / closing body A1. The winding drive source 20 is an electric motor and is a DC motor or an AC motor. A drive shaft 22 is fixed to the center of the rotor 21 of the drive source 20, and the rotational force of the drive shaft 22 is configured to be transmitted to the take-up shaft A30 via the power transmission unit A31.

  The braking device 3 includes a braking unit 4 that brakes the rotation of the winding shaft A <b> 30 and a braking operation unit 5 that releases braking of the braking unit 4.

  The braking unit 4 includes a brake shaft 40 disposed coaxially with the drive shaft 22, a brake shoe 41 fixed to the drive shaft 22, a brake drum 42 fixed to the brake shaft 40 and contacting and leaving the brake shoe 41, A coil spring 43 that biases the brake drum 42 toward the brake shoe 41 is provided.

  The braking unit 4 maintains the contact state of the brake drum 42 with respect to the brake shoe 41 by the urging force of the coil spring 43, thereby rotating the drive shaft 22 on which the rotation of the winding shaft A30 due to the weight of the opening / closing body A1 acts. It is designed to brake. Further, when the brake drum 42 is separated from the brake shoe 41 by the brake release operation of the brake operation unit 5, the braking of the drive shaft 22 on which the rotation of the winding shaft A30 due to the weight of the opening / closing body A1 acts is released. ing. When braking of the drive shaft 22 is released, the winding shaft A30 rotates in the closing direction due to the weight of the opening / closing body A1, and the opening / closing body A1 slides in the closing direction to be in the closed state.

  The braking operation unit 5 separates the brake drum 42 from the brake shoe 41 against the urging force of the coil spring 43, and is provided so that the tip projects out of the casing A5.

  The braking operation unit 5 is supported so as to swing with respect to the brake shaft 40. When a pressing force by the braking release operation unit 6 of the automatic closing device 10 is applied to a portion protruding outside the casing A5, the braking operation unit 5 is braked. The operation unit 5 is tilted in the braking release direction (right direction in the drawing in FIG. 2). Due to the tilting of the braking operation unit 5, the brake shaft 40 slides to the right in the drawing against the urging force of the coil spring 43, and the brake drum 42 moves away from the brake shoe 41 as the brake shaft 40 slides. Braking is released. Further, when the pushing operation by the brake release operation unit 6 of the automatic closing device 10 with respect to the brake operation unit 5 is released, the brake drum 40 is slid in the left direction in the drawing by the urging force of the coil spring 43, and the brake drum 42 is brought into contact with the brake shoe 41 to return to the braking state, and the braking operation section 5 that has been tilted returns to the braking state.

  The automatic closing device 10 includes a brake release operation unit 6 including a slide unit 60 that pushes the braking operation unit 5, and the slide unit 60 slides to push the braking operation unit 5 when power is supplied. Has been placed.

  3 to 5 are configuration diagrams of the automatic closing device 10. The automatic closing device 10 includes a brake release operation unit 6 and a control circuit unit 7 that controls the operation of the brake release operation unit 6, and these units are built in the casing 100. Moreover, the signal input part 200 for performing various signal inputs is provided.

  The brake release operation unit 6 includes a slide unit 60 that slidably passes through the left and right side walls 101 in the illustration of the casing 100, a drive source 61 that generates a drive force for sliding the slide unit 60, and driving of the drive source 61. And a drive transmission unit 62 that transmits the force to the slide unit 60.

  The slide portion 60 pushes the braking operation portion 5 by sliding, and includes a push portion 63 at an end protruding from the side wall 101. The slide portion 60 corresponds to a rack and pinion rack that constitutes the most downstream portion of the drive transmission portion 62, and a tooth portion 620 is formed on the upper surface portion of the slide portion 60. A stopper portion 60 </ b> A for restricting excessive sliding of the slide portion 60 protrudes from the side surface portion of the slide portion 60. In addition, a tension spring 60B is disposed across the slide portion 60 and the casing 100, and the slide portion 60 that has been slid in the braking release direction is returned to the braking direction by the biasing force of the tension spring 60B.

  The stopper portion 60 </ b> A is configured to stop excessive sliding of the slide portion 60 by contacting a contact plate 102 provided in the casing 100 during the slide of the slide portion 60. Further, three screw holes 60C for screwing and supporting the stopper portion 60A are opened on the side surface portion of the slide portion 60, and the slide amount of the slide portion 60A necessary for releasing the braking of the braking device 3 is provided. The position of the stopper portion 60A can be changed in correspondence with (a different slide amount depending on the brake device model or the like). That is, when the stopper portion 60A stops the slide control of the slide portion 60 due to a failure of the control circuit portion 7 or the like, the braking operation by excessive slide of the slide portion 60 is stopped by stopping the slide of the slide portion 60. The part 5 and the slide part 60 are prevented from being damaged or deformed.

  As the drive source 61, a DC motor is used. The drive source 61 is driven and stopped under the control of the control circuit unit 7 based on the input brake release signal and brake return signal.

  The drive transmission unit 61 includes a tooth part 620 formed on the slide part 60, a pinion 621 that meshes with the tooth part 620, and a gear train (not shown) that transmits the drive of the drive source 62 to the pinion shaft 622 of the pinion 621. And a built-in gear box 623. The drive transmission unit 62 includes a one-way clutch 624 that prevents reverse rotation of the pinion 621 when the braking release operation unit 6 releases the braking of the braking unit 4, and a control circuit unit based on an input braking return signal 7, a solenoid 625 for releasing the reverse rotation prevention state of the one-way clutch 624 is provided.

  The pushing portion 63 includes a support plate 63A provided at an end portion of the slide portion 60 on the braking operation portion 5 side, and a contact body 63B screwed to the support plate 63A. The support plate 63 </ b> A is formed such that its side surface portion 630 is parallel to the side wall 101 of the casing 100. The contact body 63B includes an adjustment bolt 631 screwed to the side surface portion 630 in parallel with the sliding direction of the slide portion 60, and a lock nut 632 that fixes the position of the adjustment bolt 631. The portion comes into contact with the braking operation unit 5. The contact body 63B performs fine adjustment of the contact position with respect to the brake operation unit 5 by rotating the adjustment bolt 631 and moving the bolt head portion in the direction of the brake operation unit 5 or the casing 100. .

  The stopper portion 60A may be attached as shown in FIGS. The stopper portion 60 </ b> A in this form protrudes from the side surface portion of the slide portion 60 protruding from the left side wall 101 in the illustration of the casing 100, and comes into contact with the left side wall 101 by sliding of the slide portion 60. Further, three screw holes 60B for screwing and supporting the stopper portion 60A are opened on the side surface portion of the slide portion 60, and the position changing operation of the stopper portion 60A can be performed from the outside of the casing 100. Yes. That is, since the position changing operation of the stopper portion 60A can be performed without opening the casing 100, an improvement in the speed of the position changing operation can be expected. In the drawing, reference numeral 60 </ b> D is a protrusion for preventing the slide portion 60 from coming off, and is screwed onto the side surface portion of the slide portion 60. In addition, description about the site | part which overlaps with the form shown in FIGS. 3-5 was abbreviate | omitted by attaching | subjecting the same code | symbol.

  Such an automatic closing device 10 detects a fluctuation in the current value of the drive source 61 during the braking release operation, and when the detected current value exceeds a predetermined threshold value, the movable limit position of the braking operation unit 5 is detected. The control of stopping the drive of the drive source 61 so that the slide of the slide unit 60 stops, and the threshold value of the drive source 61 that fluctuates due to the change in the ambient temperature of the switchgear 1 as shown in FIG. By controlling to correct the threshold value corresponding to the current value, the slide unit 60 is prevented from excessively sliding regardless of the fluctuation of the current value of the drive source 61, and the braking operation unit 5 and the slide unit 60 are damaged. And prevent deformation.

  Hereinafter, the control for stopping the drive of the drive source 61 at the movable limit position of the braking operation unit 5 will be specifically described. FIG. 9 is a block diagram illustrating a configuration of the automatic closing device 10 including the control circuit unit 7. The control circuit unit 7 includes a drive switch unit 70, an operating current value detection unit 71, an operating current value detection unit 72, a movable limit detection unit 73, a braking return operation unit 74, a storage unit 75, a control unit 76, and a CPU (not shown). ).

  When the brake release signal is input to the signal input unit 200, the drive switch unit 70 turns on the drive source 61. When the brake switch signal is input to the signal input unit 200, the drive switch unit 70 turns on. 61 is turned off.

  The operating current value detector 71 starts detecting the operating current value of the driving source 61 simultaneously with the turning on of the driving switch unit 70, and continues to detect the current value fluctuation of the driving source 61 in real time during this detection. The detection of the operating current value of the drive source 61 is completed simultaneously with the turning-off of the drive switch unit 70. In addition, the operating current value detection unit 71 starts detection when a braking release signal is input to the signal input unit 200, and ends detection when a braking return signal is input to the signal input unit 200. Also good.

  The operating current value detector 72 of the present embodiment detects a peak value of the inrush current value when the drive source 61 is started based on the detected operating current value, and outputs a peak signal.

  The movable limit detector 73 detects that the detected operating current value exceeds a predetermined threshold value, and outputs a movable limit signal indicating that the braking operation unit 5 has reached the movable limit position.

  The brake return operation unit 74 outputs a reverse rotation prevention release signal for releasing the reverse rotation prevention state of the one-way clutch 624 to the solenoid 625 based on the brake return signal input to the signal input unit 200. It is.

  The storage unit 75 is a ROM that stores various programs executed by the CPU, various application programs, various data, and the like, and a threshold value that is set to correspond to each peak value of the inrush current value. A RAM or the like that temporarily stores data, calculation results, and the like is provided, and various programs and various data are taken in and out based on requests from the control unit 76.

  The above-described threshold data is threshold value data set so as to correspond to each operating current value of the drive source 1 that changes due to a change in the ambient temperature, and corresponds based on the output peak signal. The threshold value is read out.

  The threshold value can be set by setting a threshold value corresponding to an operating current value for each arbitrary temperature. The change in the operating current value is represented by the waveforms A, B, and C shown in FIG. , D and E indicate that the change on the low temperature side is large and the change on the high temperature side is small. That is, the above threshold value setting corresponds to many operating current values by reducing the temperature difference on the low temperature side within the range in which the driving source 61 can be stopped at the movable limit of the braking operation unit 5. It is preferable to set a threshold value and set a threshold value corresponding to a smaller operating current value than the low temperature side by increasing the temperature difference on the high temperature side. The setting of the threshold value is not limited to the exemplified setting method, and can be arbitrarily set within a range in which the driving source 61 can be stopped at the movable limit of the braking operation unit 5.

  The control unit 76 controls the brake releasing operation and the braking operation of the automatic closing device 10, and specifically, a drive control unit 9A, an operating current value detection control unit 9B, and a movable limit detection limit control unit 9C. And an operating current value detection control unit 9D, a threshold value correction control unit 9E, a movable limit detection control unit 9F, and a braking state return control unit 9G.

  The drive control unit 9A controls the drive switch unit 70 to be turned on based on the brake release signal input to the signal input unit 200 and the drive switch unit based on the movable limit signal output from the movable limit detection unit 73. 70 is controlled to be turned off.

  The operating current value detection control unit 9B controls the operating current value detection unit 71 to start detecting the operating current value of the driving source 61 at the same time as the driving switch unit 70 is turned on, and operates at the same time as the driving switch unit 70 is turned off. The current value detector 71 is controlled to end the detection of the operating current value of the drive source 61.

  The movable limit detection limit control unit 9C performs control to limit detection of an operating current value exceeding a predetermined threshold before correction of the threshold at the same time when the drive switch unit 70 is turned ON. Control is performed to release the restriction after threshold correction.

  The operating current value detection control unit 9D controls the operating current value detection unit 72 to detect that the detected operating current value is the peak value of the inrush current and output a peak value signal. .

  Based on the output peak value signal, the threshold value correction control unit 9E reads the corresponding threshold value data from the threshold value data stored in the storage unit 75, and based on this threshold value data, reads out the threshold value data. Control to correct the threshold value is performed.

  The movable limit detection control unit 9F controls the movable limit detection unit 73 to detect that the detected operating current value is the inrush current value at the start, and the operating current detected after the threshold is corrected. Based on the value, control is performed to detect an operating current value at the movable limit of the braking operation unit 5 and control to output a movable limit signal based on the detected operating current value.

  The brake return operation control unit 9G reversely rotates the solenoid 625 to release the reverse rotation prevention state of the one-way clutch 624 based on the brake return signal input to the signal input unit 200 with respect to the brake return operation unit 74. Control is performed to output a blocking release signal.

  FIG. 10 is a waveform diagram illustrating control operations of the operating current value detection control unit 9D, the threshold value correction control unit 9E, and the movable limit detection control unit 9F according to this embodiment. This waveform diagram shows fluctuations in the operating current value of the drive source 61 when the braking operation unit 5 reaches the movable limit position from the start of the drive source 61. In this waveform diagram, an inrush current waveform a representing the operating current value at the start of the drive source 61, a braking release operating current waveform b representing the operating current value in a state where the slide unit 60 pushes the braking operation unit 5, A movable limit current waveform c representing the operating current value in a state where the braking operation unit 5 has reached the movable limit is formed. Further, a threshold value d is set near the maximum current value of the braking release operation current waveform b.

  This waveform is a change in the operating current value of the drive source 1 due to a change in ambient temperature, and an inrush current waveform a, a braking release operating current waveform b, and a movable limit current waveform c are formed as indicated by a two-dot chain line. At this time, when the threshold value d is the original position (the position indicated by the solid line), the slide source 60 is excessively slid by driving the drive source 61 even after the braking operation unit 5 reaches the movable limit. I will let you.

  In order to cope with such a change in waveform, the operating current value detection control unit 9D causes the operating current value detection unit 72 to detect that the detected operating current value is the peak value of the inrush current. A peak value signal is output, and the threshold value correction control unit 9E performs control to correct the threshold value d based on the output peak value signal. That is, the movable limit detection control unit 9F indicates that the operating current value exceeds the threshold value d in the corrected new threshold value d (indicated by a two-dot chain line). Can be detected. Therefore, even if the operating current value of the drive source 61 changes, when the braking operation unit 5 reaches the movable limit position, the pushing of the slide unit 60 acting on the braking operation unit 5 can be stopped.

  Further, in this embodiment, since the operating current value of the inrush current waveform a is a fluctuation exceeding the threshold value d, the movable limit detection limit control unit after the drive switch unit 70 is turned on and before the threshold value is corrected. 9C restricts the movable limit detection unit 73 from detecting an operating current value exceeding a predetermined threshold value, and the threshold value correction control unit 9E outputs a correction end signal after the threshold value is corrected. The movable limit detection limit control unit 9C performs control for releasing the limit of the movable limit detection unit 73 based on the control to be performed and the correction end signal that is output. That is, since the movable limit detector 73 does not detect an inrush current exceeding the threshold as an operating current at the movable limit, the slide of the slide unit 60 is stopped before the braking operation unit 5 reaches the movable limit position. I won't let you.

  FIG. 11 is a flowchart of a program including control methods for the operating current value detection control unit 9D, the threshold value correction control unit 9E, and the movable limit detection control unit 9F of the present embodiment. This program is a program that is activated when a brake release signal is input to the signal input unit 200 (step S1).

  Based on the input brake release signal, the drive control unit 9A turns on the drive switch unit 70 to start driving of the drive source 61 (step S2). Simultaneously with the drive switch unit 70 turned on, the operating current value detection unit 71 starts detecting the operating current value of the drive source 61 (step S3). At this time, the movable limit detecting unit 73 is limited so as not to detect the operating current value at the movable limit of the braking operation unit 5 based on the detected operating current value until the correction of the threshold value is completed. (Step S4)

  Based on the detected operating current value, the operating current value detector 72 detects the peak value of the inrush current value when the drive source 61 is started (step S5), and outputs a peak value signal (step S6). Based on the output peak value signal, the corresponding threshold value data is read and the threshold value is corrected (step S7). After the correction of the threshold value, the restriction that the operation current value at the movable limit of the braking operation unit 5 is not detected is released (step S8).

  When the restriction is released, the movable limit detector 73 detects the movable limit operating current value based on the detected operating current value (step S9), and outputs a movable limit signal (step S10). Based on the output movable limit signal, the drive control unit 9A turns off the drive switch 70 to stop the drive of the drive source 61, and the slide of the slide unit 60 is movable by the braking operation unit 5 in accordance with the stop of the drive. Stop at the limit position (step S11).

  In a state where the drive source 61 is stopped, the one-way clutch 624 holds the slide portion 60 at the movable limit position of the braking operation portion 5. The holding of the slide portion 60 is transmitted to the signal input portion 200 as a brake return signal. As long as is not input, it continues (step S12). When this braking return signal is input, the braking return operation unit 74 outputs a reverse rotation prevention release signal for releasing the reverse rotation prevention state of the one-way clutch 624 to the solenoid 625 (step S13). When the solenoid 625 releases the reverse rotation prevention state of the one-way clutch 624 based on the reverse rotation prevention release signal, the sliding portion 60 slides in the braking direction by the tension spring 60B, so that the braking portion 4 returns to the braking state. (Step S14).

  According to the switchgear 1 of the present embodiment, even if the operating current value of the drive source 61 changes, the threshold value d can be corrected to a threshold value corresponding to the changed operating current value. Since the operating current value at the movable limit position of the braking operation unit 5 can be detected with the corrected threshold value, excessive sliding of the slide unit 60 can be prevented. Therefore, breakage and deformation of the brake operation unit 5 and the slide unit 60 can be prevented.

  Further, when the detected operating current value is the operating current value at the time of starting, the operating current value is limited so that the movable limit detecting unit 73 does not detect it as the operating current value at the movable limit position. The one-way clutch 624 holds the slide unit 60 at the movable limit position of the braking operation unit 5, thereby preventing the slide of the slide unit 60 from stopping before the braking operation unit 5 reaches the movable limit position. be able to. Therefore, the opening / closing body A1 can be fully closed without stopping in the middle of the closing operation, and it is possible to prevent the spread of fire and smoke during a fire.

  In addition, according to the automatic closing device 10 in the opening / closing device 1 of the present invention, the setting of the sliding amount of the sliding portion 60 and the setting of the mounting position of the automatic closing device 10 with respect to the opening / closing device 2 can be performed within the range where the braking of the braking portion 4 can be released. It can be set freely if it is within. Therefore, the efficiency of the attaching operation of the automatic closing device 10 can be improved. In particular, when the automatic closing device 10 is exchanged at an existing site, the automatic closing device 10 can be efficiently attached.

  The opening / closing device 1 illustrated in the above-described embodiment is such that the automatic closing device 10 pushes and tilts the braking operation unit 5 by sliding the slide unit 60. The embodiment includes a form in which the braking operation unit 6 is moved and tilted by sliding (not shown). Further, the automatic closing device 10 of the present invention is not limited to the illustrated form, and may be any form that can slide the slide part 60 and tilt the braking operation part 5 by driving the drive source 61 (see FIG. Not shown). Further, the function of the automatic closing device 10 and the braking operation unit 5 may be incorporated in a casing A5 in which the opening / closing device 2 is incorporated (not shown). In addition to the shutter device, the present invention is braked in a state where the opening / closing body is always urged to the closed side by its own weight, spring force, magnetic force, etc. The present invention can also be applied to opening / closing devices such as overhead door devices, door devices, sliding door devices, folding door devices, smoke-proof wall devices, and smoke-proof curtain devices.

1: Opening / closing device 10: Automatic closing device A1: Opening / closing body 3: Braking device 4: Braking unit 5: Braking operation unit 6: Braking release operation unit 72: Operating current value detection unit 76: Control unit d: Threshold

Claims (5)

  An opening / closing body that closes due to its own weight, a braking portion that brakes the closing operation due to its own weight, a braking operation portion that operates to release braking of the braking portion, and a brake release for the braking operation portion A brake release operation unit that operates so as to perform the braking operation, and the brake release operation of the brake release operation unit is stopped when an operating current value exceeding a predetermined threshold is detected during the brake release operation of the brake release operation unit An opening / closing device including a control unit that controls the operation current value to detect the magnitude of the operation current value and to output an operation current value signal. A switchgear comprising a control for correcting the threshold value to a threshold value set to correspond to each magnitude of the operating current value based on the operating current value signal.   2. The switchgear according to claim 1, wherein the operating current value detection unit is configured to detect a peak value of an inrush current when the braking release operation unit is started.   The control unit further controls to prevent detection of an operating current value exceeding a predetermined threshold before correcting the threshold, and releases the limit after correcting the threshold. 3. The switchgear according to claim 1, further comprising:   An opening / closing body that closes due to its own weight, a braking portion that brakes the closing operation due to its own weight, a braking operation portion that operates to release braking of the braking portion, and a brake release for the braking operation portion A brake release operation unit that operates so as to perform the braking operation, and the brake release operation of the brake release operation unit is stopped when an operating current value exceeding a predetermined threshold is detected during the brake release operation of the brake release operation unit And an operation current value detection step of detecting an operation current value signal and outputting an operation current value signal, and an output of the operation current value signal. And a threshold value correcting step for correcting the threshold value to a threshold value set so as to correspond to each magnitude of the operating current value. Correction method.   Further, a detection limiting step for limiting the detection of an operating current value exceeding a predetermined threshold before the threshold correction, and a detection limit for releasing the limit after the threshold correction A method for correcting a threshold value of a switchgear according to claim 4, further comprising: a releasing step.

Images