JP2010189908A - Limit switch device and opening/closing body control device - Google Patents

Abstract

A limit switch device capable of dealing with both right and left hands, for example, capable of correctly recognizing a limit position and controlling an opening / closing operation even when a shutter curtain is moved during a power failure, etc. An opening / closing body control device is provided.
A limit switch device according to the present invention maintains different output signals in a first rotation direction section and a second rotation direction section by a rotation counting mechanism capable of rotating in two directions with a limit position as a boundary. Output. Further, the opening / closing body control device of the present invention counts the number of rotations of the rotation shaft of the drive source and the drive source that drives the opening / closing body by rotating the rotation shaft. And a control means for recognizing a limit position of the opening / closing body and performing opening / closing control of the opening / closing body based on a change in an output signal from the limit switch device.
[Selection] Figure 1

Description

  The present invention relates to a limit switch device and an opening / closing body control device, for example, a shutter, a door, a window, an overhead door, a gate, a gate (for example, a gate such as a parking lot), a roll screen (for example, a light shielding curtain), a blind, an awning device, etc. The present invention can be applied to a limit switch device used for the opening / closing device and an opening / closing body control device using the limit switch device.

  For example, in an electric shutter device, the shutter curtain is rolled up and down by the rotation of an electric motor. This shutter curtain lowering control is performed by a control circuit (also referred to as a control panel) using a limit signal from a limit switch. Based on.

  As a conventional limit switch, for example, there is a one-point limit switch having a counter mechanism (rotation counting mechanism).

  The one-point limit switch having this counter mechanism counts the contact only when the counter mechanism counts the rotation of the electric motor and the counter value reaches one contact position (here, the lower limit contact position). The limit signal is turned off and a limit signal is output to the control circuit 20 (see Patent Document 1).

  FIG. 2 is a configuration diagram showing a configuration of a one-point limit switch 10 having a conventional counter mechanism (rotation counting mechanism).

  As shown in FIG. 2, the one-point limit switch 10 having a conventional counter mechanism includes two counter mechanisms, a right-handed rotation counting mechanism 11 and a left-handed rotation counting mechanism 12, which are respectively This is a counter mechanism whose rotation direction is reversed. And these two counter mechanisms are used properly according to the convenience when installing in the opening / closing device of the limit switch 10.

  For example, FIG. 3 is a configuration diagram showing an example of an electric motor device 19 provided with a conventional limit switch.

  As illustrated in FIG. 3, the limit switch 10 is provided in the vicinity of the motor 13 and the rotating body 14.

  One such electric motor device 19 is provided in an electric switchgear. The position where the electric motor device 19 is installed is, for example, a push button because of actual work efficiency and wiring cost. In general, the switches are arranged corresponding to the installation positions of the switches.

  At this time, for example, as shown in FIG. 4, there are a case where the switch is provided on the right side and a case where the switch is provided on the left side. Call it selfish.

  The limit switch 10 has two rotations of a right-handed rotation counting mechanism 11 and a left-handed rotation counting mechanism 12 so that the same electric motor device 19 can be mounted in either the right-handed or left-handed. It has a counting mechanism.

  FIG. 5 is an explanatory diagram for explaining a contact state of a one-point limit switch 10 having, for example, a counter mechanism. The control circuit 15 performs the lowering control according to the contact state of the limit switch 10 as shown in FIG.

  In FIG. 5, the right side of the lower limit contact position is the contact state in the right hand, and the left side of the lower limit contact position is the contact state in the left hand.

  In the right-handed contact state, the right direction indicates the shutter rise and the left direction indicates the decrease. When the shutter curtain is located above the lower limit, the counter value is assumed to be located on the right side of the lower limit contact position.

  When the shutter curtain descends and the counter value reaches the lower limit contact position, the contact is turned OFF and a limit signal is given to the control circuit 15 to perform lower limit control.

  Furthermore, when the counter value is located on the left side of the lower limit contact position, it is assumed that the shutter curtain is at the lower limit.

  On the other hand, in the contact state at the left hand, the left direction indicates the shutter rise, and the right direction indicates the decrease. When the shutter curtain is located above the lower limit, the counter value is assumed to be located on the left side of the lower limit contact position.

  When the shutter curtain descends and the counter value reaches the lower limit contact position, the contact is turned OFF and a limit signal is given to the control circuit 15 to perform lower limit control.

  Furthermore, when the counter value is located on the right side of the lower limit contact position, it is assumed that the shutter curtain is at the lower limit.

  Thus, in both the right-handed and left-handed, the control circuit 15 recognizes that the lower limit position of the shutter has been reached by turning off the contact state of the limit switch 10, and rotates the motor 13. Control.

JP 61-243624 A

  However, when the above-described conventional limit switch 10 is used, for example, a power failure occurs, and if the user manually moves the shutter curtain during the power failure, the limit position cannot be correctly recognized, There is a risk that the opening and closing operation of the shutter curtain may be defective.

  For example, FIG. 6 is an explanatory diagram for explaining a problem that may occur in the case of a right hand.

  In FIG. 6, it is assumed that the shutter curtain is located above the lower limit at the time of a power failure (that is, the shutter is open), and the count position of the limit switch 10 stops at the right side of the lower limit contact position (FIG. 6). (A)).

  When the user manually lowers the shutter curtain position during the power failure, the counter value of the limit switch 10 exceeds the lower limit contact position and moves to the position shown in FIG. 9C (FIG. 6). (B)).

  In this case, when a closing operation instruction is given after power recovery, the control circuit 15 instructs the motor to perform the closing operation. However, the counter value of the limit switch 10 is the lower limit contact position even if the lower limit position should be originally set. Therefore, the limit position cannot be detected, and the closing operation is continued as it is. In the worst case, the shutter curtain may be reversely wound.

  The present invention has been made in view of the above points, and can deal with both right and left hands.For example, even when the shutter curtain is moved during a power failure, the limit position is correctly recognized. A limit switch device and an opening / closing body control device capable of controlling the opening / closing operation are provided.

  In order to solve such a problem, the limit switch device of the first aspect of the present invention includes a first rotation direction section and a second rotation direction section by a rotation counting mechanism that can rotate in two directions with a limit position as a boundary. , And maintaining and outputting different output signals.

  The opening / closing body control device according to the second aspect of the present invention includes (1) a drive source for driving the opening / closing body by rotating the rotation shaft, and (2) counting the number of rotations of the rotation shaft of the drive source, A limit switch device according to the first aspect of the present invention, and (3) a control means for recognizing a limit position of the opening / closing member and performing opening / closing control of the opening / closing member based on a change in an output signal from the limit switch device. Features.

  According to the present invention, it is possible to deal with both right and left hand, and for example, even when there is a shutter curtain movement operation at the time of a power failure or the like, the limit position can be recognized correctly and the opening / closing operation can be controlled.

It is a block diagram which shows the control circuit of 1st Embodiment, and its periphery structure. It is a block diagram which shows the structure of the conventional limit switch. It is a block diagram which shows the structure of the conventional motor, a control panel, and a limit switch. It is explanatory drawing explaining a right hand and a left hand. It is explanatory drawing explaining the contact state of the conventional limit switch. It is explanatory drawing explaining the conventional subject. It is explanatory drawing explaining the contact state of the limit switch of 1st Embodiment. It is a flowchart which shows the descent | fall control process in the control circuit of 1st Embodiment. It is explanatory drawing explaining the descent | fall control according to the contact state of the limit switch of 1st Embodiment. It is explanatory drawing explaining the structure of the limit switch of 1st Embodiment.

(A) Embodiment Hereinafter, a first embodiment of a limit switch device and an opening / closing body control device of the present invention will be described with reference to the drawings.

  In this embodiment, an embodiment in which the present invention is applied to an opening / closing body control device of an opening / closing device such as an electric lightweight shutter will be described as an example.

(A-1) Configuration of Embodiment FIG. 1 is a configuration diagram illustrating a configuration of a control circuit 20 according to the first embodiment and a peripheral configuration connected to the control circuit 20.

  In FIG. 1, the control circuit 20 is connected to a lower limit switch 30, an open switch 41, a stop switch 42, a close switch 43, a left / right hand switch 50, a motor M, a brake B, and an encoder PG.

  As illustrated in FIG. 1, the control circuit 20 includes at least a CPU 21, a ROM 22, a RAM 23, and an EEPROM 24. The control circuit 20 implements the function of the control circuit 20 as software, for example, when the CPU 21 reads out a processing program stored in the ROM 22 and the CPU 21 executes the processing program.

  When the control circuit 20 receives the operation instruction signals (open signal, stop signal, and close signal) from the open switch 41, the stop switch 42, and the close switch 43, the control circuit 20 applies to the motor M and the brake B according to the operation instruction signals. It is an opening / closing body control device that gives an operation signal and controls the opening / closing operation of the shutter. Since the control circuit 20 controls the rotation of the motor M, the winding shaft of the shutter curtain can be rotated, so that the shutter curtain can be raised or lowered.

  Further, the control circuit 20 determines a position to stop the shutter curtain according to the contact state of the lower limit switch 30 when the shutter curtain is lowered.

  Further, the control circuit 20 receives the pulse signal output from the encoder PG and gives the number of pulse signals to the lower limit switch 30. Thereby, the lower limit switch 30 having a rotation counting mechanism can count the number of rotations of the rotating shaft by the motor M.

  The lower limit switch 30 is a one-point limit switch having a counter mechanism. The lower limit switch 30 counts the number of rotations of the rotating shaft of the motor M through the control circuit 20, and turns the contact ON or OFF according to the count value with respect to the lower limit contact position.

  That is, the lower limit switch 30 switches the state above the respective lower limits of the right hand and the left hand with a binary value (ON, OFF). Thereby, the control circuit 20 can correctly recognize the state of the shutter curtain at that time point only by looking at the contact state of the lower limit switch 30.

  FIG. 7 is an explanatory diagram for explaining the contact state of the lower limit switch 30.

  In FIG. 7, the right side of the lower limit contact position shows the contact state in the right hand, and the left side of the lower limit contact position shows the contact state in the left hand.

  If the shutter curtain is positioned above the lower limit at the right hand, the lower limit switch 30 is kept ON. Then, with respect to the lower limit contact position, a rightward movement indicates a change in the counter value when the right hand is raised, and a leftward movement indicates a change in the counter value when the right hand is lowered.

  As described above, when the shutter curtain is positioned above the lower limit in the right-handed manner, the contact state of the lower limit switch 30 is always kept ON, so that the control circuit 20 determines the contact state at the time of determination. It is possible to correctly determine the state of the shutter curtain.

  That is, the control circuit 20 can determine that the contact state is the open state when the contact state is ON, and the lower limit when the contact state is OFF.

  On the other hand, if the shutter curtain is positioned above the lower limit in the left-hand mode, the lower limit switch 30 maintains OFF. The leftward movement with respect to the lower limit contact position indicates a change in the counter value when the left hand is raised, and the rightward movement indicates a change in the counter value when the left hand is lowered.

  Thus, when the shutter curtain is positioned above the lower limit in the left-handed manner, the contact state of the lower limit switch 30 is always kept OFF, so the control circuit 20 determines the contact state at the time of determination. It is possible to correctly determine the state of the shutter curtain.

  That is, the control circuit 20 can determine that the contact state is the open state when the contact state is OFF, and the lower limit when the contact state is ON.

  Thus, the lower limit switch 30 indicates the state of the shutter curtain in the right-handed and left-handed states by maintaining one of the binary contact states with the lower limit contact position as a boundary.

  By the way, as explained in the background art, the conventional lower limit switch is turned OFF only when the counter value reaches the lower limit contact position, and the control circuit detects only the change of “ON → OFF”. It was judged as the lower limit.

  On the other hand, the control circuit 20 of this embodiment detects the lower limit by detecting a change in the contact state that maintains the binary value, such as “ON → OFF” or “OFF → ON” of the lower limit switch 30. It is different from the prior art in judging.

  That is, in the conventional control circuit, the idea of “stopping the operation” by turning “OFF” is normal, but in this embodiment, the control circuit detects a change in the contact state that maintains the binary value. It can be said that this is a new technical idea different from the conventional one.

  FIG. 10 is a configuration diagram showing the configuration of the lower limit switch 30. As shown in FIG. 10, the lower limit switch 30 has one rotation counting mechanism (counter mechanism) 31 and one contact point position 32.

  The rotation counting mechanism 31 counts the number of rotations of the rotating shaft of the motor M. The rotation counting mechanism 31 is configured by combining, for example, a gear, a disk, and the like, and is configured such that the shutter curtain reaches from the lower limit to the upper limit until the disk rotates once.

  Various configurations can be applied to the rotation counting mechanism 31. For example, a gear having an axis (rotation axis) parallel to the rotation axis of the motor M receives the rotation output of the rotation axis of the motor M and rotates. The disk of the drive gear meshing with this gear is rotated.

  The contact position 32 corresponds to the lower limit position of the shutter curtain. When the disk of the rotation counting mechanism 31 rotates and reaches this contact position, the contact of a micro switch (not shown) is turned ON or OFF.

  Unlike the conventional limit switch, the lower limit switch 30 can be realized only by providing one rotation counting mechanism. Since the lower limit switch 30 of this embodiment is in a contact state that maintains a binary value with the lower limit contact position as a boundary, by changing the rotation direction of the rotation counting mechanism (counter mechanism), one rotation counting mechanism is used. Even if there is, it can be realized.

  The open switch 41, the stop switch 42, and the close switch 43 are operation switches of the opening / closing device, and transmit an open operation signal, a stop operation signal, and a close operation signal to the control circuit 20 when pressed by the user. In this embodiment, a case of a three-point operation switch of open, stop and close is illustrated, but a two-point operation switch of open and close may be applied.

  The left-right switching switch 50 is a switch that indicates whether the lower limit switch 30 is installed on the right or left side when the lower limit switch 30 is installed on the switchgear. For example, the changeover switch may be set when the lower limit switch 30 is installed in the initial stage.

  The motor M rotates the drive shaft under the control of the control circuit 20. The drive shaft of the motor M is connected to the winding shaft of the shutter curtain via a motion transmission mechanism (for example, a chain and sprocket, a belt and a pulley, and two or more gears). The movement is converted to the vertical movement of the shutter curtain.

  The brake B is unlocked when energized, and allows the drive shaft of the motor M to be driven. When not energized, the brake B enters a locked state and prevents the drive shaft of the motor M from being driven.

  The encoder PG outputs a pulse signal to the control circuit 20 as the drive shaft of the motor M rotates. Through the control circuit 20, the lower limit switch 30 counts the number of pulse signals from the encoder PG and switches the contacts.

(A-2) Operation of the First Embodiment Next, the operation of the shutter curtain lower limit control process in the opening / closing apparatus of the first embodiment will be described with reference to the drawings.

  FIG. 8 is a flowchart showing the lower limit control process of the first embodiment. In FIG. 8, in the case of the right hand, the contact state of the lower limit switch 30 is set to ON when the shutter is opened, and the contact state is set to OFF when the shutter is at the lower limit.

  First, when the electric switchgear is attached, the motor M and the control circuit 20 are installed in a storage box in which the shutter curtain is stored. Generally, the motor M is a push button switch (open switch 41) of the switchgear. , Stop switch 42 and closing switch 43) are provided on the side where they are installed. This is because there is a cost advantage to shorten the wiring distance from the push button switch to the control circuit 20 and the motor M.

  That is, when the push button switch is arranged on the right side of the switchgear, the motor M is attached as a right hand, and when the push button switch is arranged on the left side of the switchgear, the motor M is attached as a left hand. It is done.

  Further, the lower limit switch 30 is arranged at a position near the motor M. Therefore, when the motor M is a right hand, the lower limit switch 30 is also a right hand, and when the motor M is a left hand, the lower limit switch is also a left hand.

  As described above, the left / right hand selector switch 50 is operated in accordance with whether the user is right-handed or left-handed when installing the switchgear (step S101). Thereby, the control circuit 20 can know that the lower limit switch 30 is installed in any of the left and right hand.

  After the installation work of the opening / closing device is completed, the control circuit 20 performs the opening / closing operation of the shutter based on the operation instruction signal received from the push button switches (open switch 41, stop switch 42, close switch 43).

  When the close switch 43 is pressed (step S102) and a close operation instruction signal is given from the close switch 43 to the control circuit 20, the control circuit 20 determines whether the lower limit switch 30 is right hand or left hand (step). S103). The determination of the control circuit 50 is made based on whether the left / right hand changeover switch 50 at the time of installation is switched to the right hand or the left hand.

  And when the lower limit switch 30 is right handed, it transfers to step S104. In step S <b> 104, the control circuit 20 determines the contact state of the lower limit switch 30.

  At this time, if the contact state of the lower limit switch 30 is ON, it can be determined that the shutter curtain is located above the lower limit, so the control circuit 20 controls the motor M so as to lower the shutter curtain ( Step S105).

  On the other hand, if the contact state of the lower limit switch 30 is OFF, it can be determined that the shutter curtain is positioned at the lower limit, and therefore the control circuit 20 controls to stop the lowering control of the shutter curtain (step S106). ).

  On the other hand, if the lower limit switch 30 is left-handed in step S103, the process proceeds to step S107. In step S107, the control circuit 20 determines the contact state of the lower limit switch.

  At this time, if the contact state of the lower limit switch 30 is OFF, it can be determined that the shutter curtain is located above the lower limit, and therefore the control circuit 20 controls the motor M to lower the shutter curtain. (Step S108).

  On the other hand, if the contact state of the lower limit switch 30 is ON, it can be determined that the shutter curtain is positioned at the lower limit, and therefore the control circuit 20 controls to stop the lowering control of the shutter curtain (step S106). ).

  Subsequently, as described above, the control circuit 20 determines the contact state of the lower limit switch 30 and controls the lowering of the shutter. However, a power failure occurs, and the user manually opens the shutter curtain that opens during the power failure. The processing of the control circuit 20 in the case of having been moved in step will be described with reference to FIG.

  FIG. 9 illustrates a case where the control circuit 20 performs the descending control when the player is right-handed. First, in this case, when a power failure occurs, the stop position of the shutter curtain at the time of the power failure is assumed to be stopped at the position shown in FIG.

  It is assumed that the user manually moves the shutter curtain during the power failure (FIG. 9B) and sets the position of the shutter curtain to the position of FIG. 9C.

  In the conventional case, as shown in FIG. 6, the lower limit switch switches the contact state to OFF only when the counter value reaches the lower limit contact position. Therefore, when the shutter curtain moves beyond the lower limit contact position by the user, the control circuit 20 cannot recognize the correct limit position at the time of power recovery.

  However, according to this embodiment, the lower limit switch 30 turns the contact state OFF even after the counter value exceeds the lower limit contact position in the case of the right hand. Therefore, even if the shutter curtain moves beyond the lower limit contact position by the user, the control circuit 20 can recognize the correct limit position only by looking at the contact state at that time when power is restored.

  In the case of FIG. 9, since the stop position at the time of power recovery is the position of FIG. 9C, when the close switch 43 is pressed at that time, the control circuit 20 changes the contact state of the lower limit switch 30. to decide. Then, at this time, the contact state of the lower limit switch 30 is OFF (FIG. 9C), so the control circuit 20 determines that the shutter curtain is positioned at the lower limit and stops the descent. Control to do.

(A-3) Effects of First Embodiment As described above, according to the first embodiment, by using a one-point limit switch having a counter mechanism as a lower limit switch, With respect to the shutter curtain state in the left-handed manner, the contact state can be changed by maintaining one of the binary contact states with the lower limit contact position as a boundary.

  According to the first embodiment, the control circuit can determine whether the shutter curtain exceeds the lower limit limit by looking at the contact state of the lower limit switch as described above.

  Furthermore, according to the first embodiment, when a power failure occurs, even if the user moves the shutter curtain beyond the lower limit position during the power failure and then instructs to close it, the control circuit Since control can be performed according to the contact state of the switch, problems such as reverse winding can be avoided.

(B) Other Embodiments In the above-described embodiments, the case where the present invention is applied to the limit switch that determines the lower limit position is illustrated, but the present invention can also be applied to the limit switch that determines the upper limit position.

  In the above-described embodiment, the case where the present invention is applied to, for example, an electric lightweight shutter has been shown as an example of an opening / closing device. However, any electric opening / closing device can be widely applied.

20 ... Control circuit, 30 ... Lower limit switch, 31 ... Rotation counting mechanism, 32 ... Contact position,
41 ... Open switch, 42 ... Stop switch, 43 ... Close switch,
50 ... Left / right hand switch, M ... Motor, B ... Brake, PG ... Encoder.

Claims (5)

  Limit switch device characterized by maintaining and outputting different output signals in the first rotation direction section and the second rotation direction section by a rotation counting mechanism rotatable in two directions with a limit position as a boundary. .   The output signal for turning on the contact state is output in the first rotation direction section, and the output signal for turning off the contact state is output in the second rotation direction section. The limit switch device described. A drive source for driving the opening and closing body by rotating the rotation shaft;
The number of rotations of the rotation shaft of the drive source is counted, and the limit switch device according to claim 1 or 2,
And a control means for recognizing a limit position of the opening / closing body based on a change in an output signal from the limit switch device and performing opening / closing control of the opening / closing body.   4. The opening / closing body control device according to claim 3, wherein the limit switch device is compatible with either a right hand or a left hand of the opening / closing device. Comprising a changeover switch means indicating that the limit switch device is provided in either the right hand or the left hand of the switchgear;
5. The opening / closing body control device according to claim 3, wherein the control means performs opening / closing control of the opening / closing body based on switching of the changeover switch and an output signal from the limit switch device. .

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