Opening and closing control device

Abstract

To make a controller recognize that a motor is operating.SOLUTION: An opening / closing controller 40 comprises a controller 41 and a driving circuit 60. The driving circuit 60 comprises switching elements 64 and 65 and a current detection circuit 70. By changing a direction of current flowing in a motor 25 from a power supply E1 by the switching elements 64 and 65, the movement of a film that can open and close an open part provided at a vinyl house is switched between an open direction and a close direction. The current detection circuit 70 outputs an operation signal to the controller 41 in the case where the current flowing from the power supply E1 is a threshold value or larger.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an opening / closing control device.

Background Art

[0002] As disclosed in Patent Document 1, a greenhouse includes a film device. The film device disclosed in Patent Document 1 includes a film, a motor, a shaft portion, a controller, and a limit switch. The controller controls so that current flows through the motor. By the operation of the motor, the shaft portion moves in the vertical direction. The shaft portion opens the opening by moving upward while winding up the film. The shaft portion closes the opening by moving downward while feeding out the film. When the shaft portion reaches a predetermined position, the energization of the motor is cut off by the limit switch turning off.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, the controller cannot recognize whether the motor is operating or stopped.

Means for Solving the Problems

[0005] The opening / closing control device that solves the above problems is an opening / closing control device that switches whether a film capable of opening and closing an opening provided in a vinyl house moves in the opening direction or the closing direction by changing the direction of the current flowing from the power source to the motor, and includes a switching element that changes the direction of the current flowing through the motor, a controller that controls the switching element, and a current detection circuit that outputs an operation signal to the controller when the current flowing from the power source is equal to or greater than a threshold value.

[0006] Regarding the above opening / closing control device, the current detection circuit may include a detection switching element that turns on when the current is equal to or greater than the threshold value, and an output switching element that outputs the operation signal when the detection switching element turns on.

[0007] Regarding the above opening / closing control device, the current detection circuit may include an operational amplifier and an output switching element that outputs the operation signal by turning on by a signal output from the operational amplifier when the current is equal to or greater than the threshold value.

[0008] Regarding the above opening / closing control device, the controller may determine whether a predetermined operation standard time has elapsed since the start of the operation of the motor, and may stop the motor when the operation signal is output when the operation standard time has elapsed.

Effects of the Invention

[0009] According to the present invention, the controller can recognize that the motor is operating.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0011] An embodiment of the opening / closing control device will be described. As shown in FIG. 1, the plastic greenhouse 10 is provided with an opening 11. A film device 20 is provided in the plastic greenhouse 10. The film device 20 includes a shaft portion 21, a film 22, a guide shaft 23, and a film opening / closing device 24. The film 22 is wound around the shaft portion 21. The guide shaft 23 is provided along the plastic greenhouse 10. The shaft portion 21 moves in the vertical direction along the guide shaft 23. The film 22 is provided so as to be able to open and close the opening 11. The shaft portion 21 opens the opening 11 by moving upward while winding up the film 22. The direction in which the shaft portion 21 moves upward is the opening direction. The shaft portion 21 closes the opening 11 by moving downward while feeding out the film 22. The direction in which the shaft portion 21 moves downward is the closing direction.

[0012] <Film Opening / Closing Device> As shown in FIG. 2, the film opening / closing device 24 includes a motor 25, an upper end limit switch 26, an upper end diode 27, a lower end limit switch 28, and a lower end diode 29. The film opening / closing device 24 is provided so as to move in the vertical direction along the guide shaft 23 together with the shaft portion 21, for example.

[0013] The motor 25 is a DC motor. The direction of rotation of the motor 25 is reversed by the direction of the current flowing through the motor 25. The rotation of the motor 25 causes the shaft portion 21 to move in the vertical direction. In the following description, the rotation direction of the motor 25 when moving the shaft portion 21 upward is referred to as the forward direction, and the rotation direction of the motor 25 when moving the shaft portion 21 downward is referred to as the reverse direction.

[0014] The upper end limit switch 26 is connected in series with the motor 25. The upper end limit switch 26 turns off when the shaft portion 21 reaches a predetermined upper end position. The upper end diode 27 is connected in parallel with the upper end limit switch 26. The upper end diode 27 is provided such that the anode of the upper end diode 27 is connected to the motor 25.

[0015] The lower end limit switch 28 is connected in series with the motor 25. The lower end limit switch 28 turns off when the shaft portion 21 reaches a predetermined lower end position. The lower end diode 29 is connected in parallel with the lower end limit switch 28. The lower end diode 29 is provided such that the anode of the lower end diode 29 is connected to the motor 25.

[0016] As shown in FIG. 3, the film device 20 includes rotating bodies 30A and 30B. The rotating bodies 30A and 30B rotate following the motor 25. The rotating body 30A includes a protrusion 31A. The rotating body 30B includes a protrusion 31B. The rotating bodies 30A and 30B are provided one by one corresponding to each of the upper end limit switch 26 and the lower end limit switch 28. The rotating body 30A corresponding to the upper end limit switch 26 is defined as the upper end rotating body 30A. When the shaft portion 21 reaches the upper limit position by the forward rotation of the motor 25, the protrusion 31A of the upper end rotating body 30A presses the upper end limit switch 26, causing the upper end limit switch 26 to turn off. The rotating body 30B corresponding to the lower end limit switch 28 is defined as the lower end rotating body 30B. When the shaft portion 21 reaches the lower limit position by the reverse rotation of the motor 25, the protrusion 31B of the lower end rotating body 30B presses the lower end limit switch 28, causing the lower end limit switch 28 to turn off.

[0017] <Opening and Closing Control Device> As shown in FIG. 2, the film device 20 includes an opening and closing control device 40. The opening and closing control device 40 includes a controller 41 and a drive circuit 60.

[0018] The controller 41 includes a first port 42, a second port 43, a third port 44, a fourth port 45, a fifth port 46, a first contact 47, a second contact 50, a photocoupler 53, and a processor 57.

[0019] The first contact 47 includes a first end 48 and a second end 49. The second contact 50 includes a first end 51 and a second end 52. The first end 48 of the first contact 47 and the first end 51 of the second contact 50 are short-circuited. The first end 48 of the first contact 47 and the first end 51 of the second contact 50 are connected to the first port 42. The second end 49 of the first contact 47 is connected to the second port 43. The second end 52 of the second contact 50 is connected to the third port 44.

[0020] The photocoupler 53 includes a photodiode 54 and a phototransistor 56. The anode of the photodiode 54 is connected to the fourth port 45 via a resistive element 55. The cathode of the photodiode 54 is connected to the fifth port 46. The phototransistor 56 turns on when it receives the light emitted by the photodiode 54.

[0021] The processor 57 is, for example, a CPU (Central Processing Unit). The processor 57 controls the opening and closing of the first contact 47 and the opening and closing of the second contact 50. The drive circuit 60 is provided between the film opening and closing device 24 and the controller 41.

[0022] The drive circuit 60 includes a first connection line 61, a second connection line 62, a third connection line 63, two switching elements 64, 65, and a current detection circuit 70. The first connection line 61 is connected to the positive electrode of the power supply E1. The negative electrode of the power supply E1 is connected to the first port 42. The second connection line 62 is connected to the second port 43. The second connection line 62 is connected to the lower limit switch 28. The third connection line 63 is connected to the third port 44. The third connection line 63 is connected to the upper limit switch 26.

[0023] The two switching elements 64, 65 include a first switching element 64 and a second switching element 65. Examples of the first switching element 64 and the second switching element 65 include a transistor and a relay. The first switching element 64 connects the first connection line 61 and the second connection line 62. The first switching element 64 is provided to turn on by the voltage between the third connection line 63 and the first connection line 61. For example, if the first switching element 64 is a transistor, the midpoint of the resistor elements connected in series between the first connection line 61 and the third connection line 63 may be connected to the base of the first switching element 64. The second switching element 65 connects the first connection line 61 and the third connection line 63. The second switching element 65 is provided to turn on by the voltage between the second connection line 62 and the first connection line 61. For example, if the second switching element 65 is a transistor, the midpoint of the resistor elements connected in series between the first connection line 61 and the second connection line 62 may be connected to the base of the second switching element 65.

[0024] The current detection circuit 70 includes a current detection unit 71 and an operation signal output unit 75. The current detection unit 71 includes a detection resistor element 72, a diode 73, and a detection switching element 74. The detection resistor element 72 is provided on the first connection line 61. The diode 73 is connected in parallel with the detection resistor element 72. The anode of the diode 73 is connected to the positive electrode of the power supply E1.

[0025] Although a transistor is used as the detection switching element 74, any switching element can be used as the detection switching element 74. The detection switching element 74 is provided to turn on when a current equal to or greater than the threshold value flows through the first connection line 61. The detection switching element 74 is provided such that the detection resistance element 72 is located between the emitter and the base of the detection switching element 74. The voltage applied across the emitter-base of the detection switching element 74 varies depending on the resistance value [Ω] of the detection resistance element 72. The detection resistance element 72 is set so that a voltage (for example, 0.7V) at which the detection switching element 74 turns on is applied across the emitter-base of the detection switching element 74 when a current equal to or greater than the threshold value flows through the first connection line 61. As a result, the detection switching element 74 turns on when the current flowing through the first connection line 61 is equal to or greater than the threshold value. The threshold value is set so that the detection switching element 74 turns on when the motor 25 is operating. When the motor 25 is operating, the current flowing through the first connection line 61 is larger than when the motor 25 is stopped. For example, when the motor 25 is stopped, a current of several tens [mA] flows through the first connection line 61, whereas when the motor 25 is operating, a current of several hundreds [mA] flows through the first connection line 61. A value that is larger than the current flowing through the first connection line 61 when the motor 25 is stopped and smaller than the current flowing through the first connection line 61 when the motor 25 is operating is set as the threshold value. Thereby, the detection switching element 74 turns on when a current equal to or greater than the threshold value flows through the first connection line 61. The current flowing through the first connection line 61 is the current flowing from the power supply E1.

[0026] The operation signal output unit 75 includes an output switching element 76, a base resistor 77, a resistor element 79, and two diodes 78 and 80. A transistor is used as the output switching element 76, but any switching element can be used as the output switching element 76. The base of the output switching element 76 is connected to the collector of the detection switching element 74 via the base resistor 77. The collector of the output switching element 76 is connected to the fifth port 46. The emitter of the output switching element 76 is connected to the second connection line 62 via the diode 78. Between the base of the output switching element 76 and the base resistor 77, it is connected to the third connection line 63 via the resistor element 79 and the diode 80. The fourth port 45 is connected to the positive electrode of the power supply E1.

[0027] The operation signal output unit 75 outputs an operation signal to the controller 41. The operation signal is a signal output during the operation of the motor 25. When the detection switching element 74 is turned on, a voltage is applied between the base and emitter of the output switching element 76. As a result, the output switching element 76 is turned on. When the output switching element 76 is turned on, an electrical signal is output from the output switching element 76 to the controller 41. This electrical signal is the operation signal. Specifically, when the output switching element 76 is turned on, the operation signal, which is an electrical signal, is input to the fourth port 45. When the operation signal is input to the fourth port 45, the photodiode 54 emits light. The phototransistor 56 turns on when it receives the light emitted by the photodiode 54. When the phototransistor 56 turns on, the phototransistor 56 outputs a high-level or low-level signal to the controller 41. Whether the phototransistor 56 outputs a high-level signal or a low-level signal depends on whether a pull-up resistor or a pull-down resistor is connected to the phototransistor 56. The controller 41 can recognize the presence or absence of the operation signal based on the signal input from the phototransistor 56. In other words, the controller 41 can recognize whether the motor 25 is operating.

[0028] <Control performed by the controller> The controller 41 controls the opening and closing of the opening 11. The controller 41 controls the switching elements 64 and 65 by controlling the first contact 47 and the second contact 50.

[0029] As shown in FIG. 4, when opening the opening 11, the controller 41 turns on the first contact 47 at time T1. The time T1 when the first contact 47 is turned on is the operation start time of the motor 25. The second contact 50 is off. When opening the opening 11, the film 22 is moved in the opening direction from the lower end position to the upper end position.

[0030] When the first contact 47 is turned on, the second switching element 65 is turned on. When the second switching element 65 is turned on, current flows through the path of the positive electrode of the power supply E1 → the second switching element 65 → the upper end limit switch 26 → the motor 25 → the lower end limit switch 28 or the lower end diode 29 → the negative electrode of the power supply E1. When the motor 25 rotates forward, the shaft portion 21 rises. When the shaft portion 21 rises to the upper end position, the upper end limit switch 26 is turned off. When the upper end limit switch 26 is turned off, the current to the motor 25 is cut off. As a result, the motor 25 stops. When the motor 25 stops, the controller 41 turns off the first contact 47.

[0031] When the controller 41 turns on the first contact 47, it starts timing. The timing is performed using the timer function of the controller 41. The controller 41 determines whether or not a predetermined operation standard time T11 has elapsed. When the operation standard time T11 has elapsed, the controller 41 outputs a timer signal at time T2. The operation standard time T11 is the time obtained by adding a margin to the time assumed to be required to move the shaft portion 21 from the lower end position to the upper end position, or from the upper end position to the lower end position. That is, the operation standard time T11 is the time obtained by adding a margin to the time assumed to be when the motor 25 operates when opening and closing the opening 11. When no abnormality has occurred in the film device 20, the motor 25 has stopped when the operation standard time T11 has elapsed. The controller 41 determines whether or not an operation signal is being output when the operation standard time T11 has elapsed. If no operation signal is being output when the operation standard time T11 has elapsed, the controller 41 can determine that the film device 20 is operating normally.

[0032] As shown in FIG. 5, when an abnormality has occurred in the film device 20, there may be a case where an operation signal is being output even at the point in time when the timer signal is output. In this case, the controller 41 determines that an abnormality has occurred in the film device 20. Then, the controller 41 stops the motor 25. For example, the controller 41 turns off both the first contact 47 and the second contact 50.

[0033] As shown in FIG. 4, when closing the opening 11, the controller 41 turns on the second contact 50 at time T3. The time T3 when the second contact 50 is turned on is the operation start time of the motor 25. The first contact 47 is off. When closing the opening 11, the film 22 is moved in the closing direction from the upper end position to the lower end position.

[0034] When the second contact 50 is turned on, the first switching element 64 is turned on. When the first switching element 64 is turned on, current flows through the path of the positive electrode of the power supply E1 → the first switching element 64 → the lower limit switch 28 → the motor 25 → the upper limit switch 26 or the upper diode 27 → the negative electrode of the power supply E1. As the motor 25 rotates reversely, the shaft portion 21 descends. When the shaft portion 21 descends to the lower end position, the lower limit switch 28 is turned off. When the lower limit switch 28 is turned off, the current to the motor 25 is cut off. As a result, the motor 25 stops. In this way, by changing the direction of the current flowing from the power supply E1 to the motor 25 by the switching elements 64 and 65, it is possible to switch whether the film 22 capable of opening and closing the opening 11 provided in the greenhouse 10 moves in the opening direction or the closing direction.

[0035] When the controller 41 turns on the second contact 50, it starts timing. The controller 41 can determine whether an abnormality has occurred in the film device 20 by determining whether the output of the operation signal stops before the time T4 when the operation standard time T11 has elapsed.

[0036] [Operation of this embodiment] When the current flowing from the power supply E1 is equal to or greater than the threshold value, the current detection circuit 70 outputs an operation signal. The controller 41 can determine whether the motor 25 is being driven based on the presence or absence of the operation signal. In this embodiment, the processor 57 can recognize the presence or absence of the operation signal by the photocoupler 53.

[0037] [Effect of this embodiment] (1) When the motor 25 is operating, the current flowing from the power supply E1 is larger than when the motor 25 is stopped. By utilizing this, the current detection circuit 70 outputs an operation signal when the motor 25 is operating. The controller 41 can determine whether the motor 25 is operating based on the presence or absence of the operation signal.

[0038] (2) The current detection circuit 70 includes a detection switching element 74 and an output switching element 76. The detection switching element 74 turns on when the current flowing from the power supply E1 is equal to or greater than a threshold value. The output switching element 76 outputs an operation signal when the detection switching element 74 turns on. Thereby, the controller 41 can determine whether the motor 25 is operating or not.

[0039] (3) The controller 41 determines whether a predetermined operation standard time T11 has elapsed since the start of operation of the motor 25. When an operation signal is output at the time when the operation standard time T11 has elapsed, the controller 41 stops the motor 25. When the motor 25 is operating at the time when the operation standard time T11 has elapsed, there may be a case where the operation of the motor 25 continues due to an abnormality of the film device 20 even though the shaft portion 21 has reached the upper end position or the lower end position. In this case, if the operation of the motor 25 is continued, it may cause damage to the film device 20. By stopping the motor 25 when an operation signal is output at the time when the operation standard time T11 has elapsed, damage to the film device 20 can be suppressed.

[0040] (4) The drive circuit 60 includes switching elements 64 and 65. The direction of the current flowing through the motor 25 can be changed by the switching elements 64 and 65. Thereby, the forward rotation and the reverse rotation of the motor 25 can be switched. If an attempt is made to change the direction of the current flowing through the motor 25 only by the contacts of the controller without using the drive circuit 60, it is necessary to use a c contact as the contact and a dedicated controller. Also, in the case of a controller using an a contact as the contact, it is necessary to use four ports. Thus, if an attempt is made to change the direction of the current flowing through the motor 25 only by the contacts of the controller, it is necessary to use an expensive controller.

[0041] On the other hand, by using the drive circuit 60, the direction of the current flowing through the motor 25 can be changed by using the switching elements 64 and 65. By using the drive circuit 60, the direction of the current flowing through the motor 25 can be changed by using a general-purpose controller 41.

[0042] (5) After raising the shaft portion 21, the controller 41 turns off the first contact 47. When the upper limit switch 26 is not turned off by the protrusion 31A due to an impact or vibration applied to the film device 20, it is possible to suppress the shaft portion 21 from rising beyond the upper end position. After lowering the shaft portion 21, the controller 41 turns off the second contact 50. When the lower limit switch 28 is not turned off by the protrusion 31B due to an impact or vibration applied to the film device 20, it is possible to suppress the shaft portion 21 from descending beyond the lower end position.

[0043] [Modification Example] The embodiment can be implemented with the following modifications. The embodiment and the following modification examples can be implemented in combination with each other within a technically consistent range.

[0044] · As shown in FIG. 6, the current detection unit 71 may be changed. The current detection unit 71 shown in FIG. 6 includes an operational amplifier 81. The inverting input terminal of the operational amplifier 81 is connected to the connection point between the detection resistor element 72 and the cathode of the diode 73. Two voltage dividing resistors 82 and 83 are connected in series to the connection point between the anode of the diode 73 and the detection resistor element 72. The two voltage dividing resistors 82 and 83 are connected to the second connection line 62 via the diode 84. The two voltage dividing resistors 82 and 83 are connected to the third connection line 63 via the diode 85. The non-inverting input terminal of the operational amplifier 81 is connected to the connection point of the two voltage dividing resistors 82 and 83. The output terminal of the operational amplifier 81 is connected to the base of the output switching element 76 via the base resistor 77.

[0045] The operational amplifier 81 amplifies and outputs the potential difference across both ends of the detection resistor element 72. The resistance value of the detection resistor element 72 and the resistance values of the voltage dividing resistors 82 and 83 are set such that when the current flowing through the first connection line 61 is equal to or greater than the threshold value, the output switching element 76 is turned on by the output of the operational amplifier 81. Thereby, when a current equal to or greater than the threshold value flows through the first connection line 61, the output switching element 76 outputs an operation signal.

[0046] · As shown in FIG. 7, the drive circuit 60 may be modified. The drive circuit 60 shown in FIG. 7 includes four switching elements 91, 92, 93, 94 and a control circuit 95. Of the four switching elements 91, 92, 93, 94, two switching elements 91, 92 are connected in series between the first connection line 61 and the second connection line 62. The connection point of the two switching elements 91, 92 is connected to the lower end limit switch 28. Of the four switching elements 91, 92, 93, 94, two switching elements 93, 94 are connected in series between the first connection line 61 and the second connection line 62. The connection point of the two switching elements 93, 94 is connected to the upper end limit switch 26. The control circuit 95 controls the four switching elements 91, 92, 93, 94. The control circuit 95 is connected to the third port 44 by the third connection line 63.

[0047] In the drive circuit 60, the operation of the motor 25 is instructed by the first contact 47. Also, the rotation direction of the motor 25 is instructed by the second contact 50. For example, when the first contact 47 is on and the second contact 50 is on, the motor 25 rotates forward. When the first contact 47 is on and the second contact 50 is off, the motor 25 rotates in reverse. The control circuit 95 controls the switching elements 91, 92, 93, 94 such that the motor 25 rotates forward when the second contact 50 is on. The control circuit 95 controls the switching elements 91, 92, 93, 94 such that the motor 25 rotates in reverse when the second contact 50 is off.

[0048] · As the current detection circuit 70, a current sensor that detects the current flowing through the first connection line 61 may be used. In this case, a signal output from the current sensor indicating that the current flowing through the first connection line 61 is equal to or greater than the threshold value is the operation signal.

Description of Symbols

[0049] 10… Greenhouse, 11… Opening, 25… Motor, 40… Opening / closing control device, 41… Controller, 64, 65… Switching elements, 70… Current detection circuit, 74… Detection switching element, 76… Output switching element, 81… Operational amplifier.

Claims

1. An opening / closing control device that switches whether a film capable of opening and closing an opening provided in a greenhouse moves in the opening direction or the closing direction by changing the direction of the current flowing from a power source to a motor, comprising: A film device including the film, The film, A shaft portion that opens the opening by moving upward while winding up the film and closes the opening by moving downward while feeding out the film, An upper limit switch that is connected in series to the motor and turns off when the shaft portion reaches a predetermined upper end position, A lower limit switch that is connected in series to the motor and turns off when the shaft portion reaches a predetermined lower end position, The opening / closing control device, A switching element that changes the direction of the current flowing through the motor, A controller that controls the switching element, A current detection circuit that outputs an operation signal to the controller when the current flowing from the power source is equal to or greater than a threshold value, The controller, Has a contact that operates the motor when turned on and stops the motor when turned off, The controller, Determines whether a predetermined operation standard time has elapsed since the start of operation of the motor, When the operation signal is output when the operation standard time has elapsed, it is determined that an abnormality has occurred in the film device, and by turning off the contact, the motor is stopped when the motor continues to operate due to the abnormality of the film device even though the shaft portion has reached the upper end position or the lower end position. An opening / closing control device.

2. An opening / closing control device that switches whether a film capable of opening and closing an opening provided in a greenhouse moves in the opening direction or the closing direction by changing the direction of the current flowing from a power source to a motor, comprising: A film device including the film, The film, A shaft portion that opens the opening by moving upward while winding up the film and closes the opening by moving downward while feeding out the film, An upper limit switch that is connected in series to the motor and turns off when the shaft portion reaches a predetermined upper end position, A lower limit switch that is connected in series to the motor and turns off when the shaft portion reaches a predetermined lower end position, The opening / closing control device is configured to: include a switching element that changes the direction of the current flowing through the motor; a controller that controls the switching element; a current detection circuit that outputs an operation signal to the controller when the current flowing from the power supply is equal to or greater than a threshold value; The controller is configured to: include a first contact that operates the motor so that the motor rotates in the forward direction when turned on; a second contact that operates the motor so that the motor rotates in the reverse direction when turned on; The controller is configured to: determine whether or not a predetermined operation standard time has elapsed since the start of the operation of the motor; when the operation signal is output at the time when the operation standard time has elapsed, determine that an abnormality has occurred in the film device, and turn off the first contact and the second contact to stop the motor when the operation of the motor continues due to the abnormality of the film device even though the shaft portion has reached the upper end position or the lower end position. The opening / closing control device.

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