JPH03279586A - Safety device of power opening/shutting body for construction - Google Patents

Abstract

PURPOSE:To improve the reliability of a safety device by providing a rotation speed detecting means of electromotor to power opening/shutting body for construction, and an abnormality detecting means to compare the motor rotation speed detecting value with a standard value so as to decide the abnormal condition to a motor control unit. CONSTITUTION:An AC voltage of a tachogenerator 5 linking to the motor shaft of an electromotor 2 is input to a controller 7 through a signal converting circuit 6. To the controller 7 provided to a shutter control circuit in a shutter control board, signals of the tachogenertor 5, three-point push-button switches PBU, PBS, and PBD, the upper and the lower limit switches LSU and LSD, and the like are input, and by the decision depending on the input signals, operation signals are output to the electromotor 2, an electric lock 9, a monitor lamp 10, an alarm buzzer 11, and the like. And, while the standard setting control and the abnormality deciding control are carried out in the up and down operation of the shutter, the abnormality process control and the like are also carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a safety device for electric opening/closing bodies for buildings, such as electric shutters, which are attached to doorways and windows of buildings.

[Prior art and problems to be solved by the invention] Generally,
This type of safety device for electric opening/closing bodies for buildings is configured to detect the presence of an obstacle that obstructs the opening/closing operation of the opening/closing body, and to stop the operation of the opening/closing body (electric motor) based on the detection. . Conventional safety devices include those that use non-contact sensors such as photoelectric sensors and infrared sensors, and those that use contact sensors that are activated by contact with obstacles and are installed on the opening/closing body side. Safety devices using the above-mentioned non-contact sensors have the disadvantage of being expensive;
Contact type sensors installed on the opening/closing body side require a transmitter/receiver to transmit the detection signal to the control panel, so this may have the disadvantage of being expensive like non-contact type sensors. However, the batteries that serve as the power source for the transmitter require frequent replacement, resulting in poor maintainability. Therefore, we focused on the fact that the motor load (supply current or voltage) changes when the opening/closing body comes into contact with an obstacle, and stops the electric motor when the motor load exceeds a preset reference value. An inexpensive safety device is proposed.

However, the supply current and voltage of an electric motor vary depending on the power supply environment, noise, etc., so it is not easy to set the reference value, but it is necessary to set the reference value in order to avoid malfunctions due to the above-mentioned current and voltage fluctuations. As a result, the detection sensitivity in detecting obstacles decreases, causing reliability problems.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was created with the aim of providing a safety device for electrically operated construction opening/closing bodies that can eliminate these drawbacks. , an electric opening/closing body for construction that opens and closes by driving an electric motor,
The electric opening/closing body for construction is provided with a rotational speed detection means for detecting the rotational speed of the electric motor, and a motor sliding control section for controlling the drive of the electric motor has a detection value of the rotational speed detection means and a preset value. The present invention is characterized in that an abnormality determining means is provided for comparing the reference value and determining the occurrence of an abnormality based on the comparison result.

Further, in a second invention, the rotational speed detection means in the first invention includes an AC speed generator connected in conjunction with the electric motor, and a frequency for detecting the frequency of the AC voltage generated by the AC speed generator. The device is characterized in that it comprises a detection means.

With this configuration, the present invention makes it possible to provide a safety device that can detect obstacles with extremely high sensitivity at a low cost.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, reference numeral 1 denotes a shutter curtain of an electric shutter, and the shutter curtain 1 is erected on both the left and right sides of the opening by the winding and rewinding operations of the winding drum 3 accompanying the forward and reverse driving of the electric motor 2. The opening is opened and closed by moving up and down along the guide rail 4, but the basic configuration is the same as before.

On the other hand, 5 is an AC tachogenerator (speed generator) interlockingly connected to the motor shaft of the electric motor 2,
The tachogenerator 5 generates an alternating current voltage through power generation operation accompanying the drive of the electric motor 2, but the alternating current voltage is generated by a rectifier circuit that half-wave rectifies the alternating current voltage, and a reference voltage that converts the half-wave rectified pulsating current into a reference voltage. The signal is input as a count value to the control unit 7, which will be described later, via a signal conversion circuit 6, which includes a comparison circuit that compares and converts it into a rectangular wave with the highest amplitude, and a count circuit that counts reference pulses generated in one cycle of the rectangular wave. It is supposed to be done.

The control unit 7 is composed of a so-called microcomputer,
It is provided in the shutter control circuit in the shutter control panel 8, and this circuit inputs signals from the tachometer generator 5, three-point pushbutton switches PBU, PBS, PBD, upper and lower limit switches LSU, LSD, etc. Depending on the judgment based on the signals, activation signals are output to the electric motor 2, electric lock 9, monitor lamp 10, alarm buzzer 11, etc.

Next, the control procedure of the control section 7 will be explained based on the flowcharts shown in FIGS. 3 to 8. The main control of the control unit 7 is the rise and fall push button switches PBU and PBD.
By driving the electric motor 2 forward and backward based on the operation, the shutter curtain 1 is raised and lowered, and
The lifting operation is stopped based on the operation of the stop push button switch PBS and the operation of the upper and lower limit switches LSU and LSD, but during the lifting operation, reference value setting control and abnormality judgment control are performed. .

If it is determined that there is an abnormality in the abnormality determination control, abnormality processing control is performed, while crime prevention control and reference value change control are performed in the stopped state.

In the above reference value setting control, first, it is determined whether the rising operation is performed or not.
It is continuously determined whether or not the reference value has not been set yet, and whether or not the operation is fully open or from the fully open position. In other words, the reference value is set separately for the ascending operation and descending operation if the first ascending operation or descending operation is a full range operation (fully closed → fully open or fully open → fully closed) after the power is turned on. It looks like this. If the above conditions are met, after waiting for T The minimum rotation speed, maximum rotation speed, and maximum rotation speed fluctuation value will be detected, but if the shutter curtain 1 lifts and lowers fully open or stops without reaching the fully open position, the setting of the reference value is canceled. On the other hand, when it reaches the fully open position or the fully open position, the detected minimum rotation speed, maximum rotation speed, and maximum rotation speed fluctuation value are multiplied by predetermined constants a□~a, respectively, and the reference value is determined. It is now set.

In the abnormality determination control that follows the reference value setting control described above, it is first determined whether or not a normal count value is input 12 hours (0.5 seconds in the example) after the motor is started. If there is no input, it is determined that the electric motor 2 has started abnormally and returns to main control. However, if the electric motor 2 starts normally, the minimum rotation speed, maximum rotation speed, and rotation of the electric motor 2 are changed. It will be judged whether the maximum variation value exceeds each reference value, and if any of them is judged as YES, it will be judged that there is an abnormality and the system will return to main control. ing. In other words, if the minimum rotation speed exceeds the reference value, it is determined that the motor rotation speed has decreased due to the contact between the shutter curtain 1 and an obstacle, and if the maximum rotation speed exceeds the reference value, It is determined that the motor rotation speed has increased due to artificially pushing and pulling the shutter curtain 1 in the operating direction, and if the maximum rotation speed fluctuation value exceeds the standard value, it is determined that some kind of abnormality, including both of the above abnormalities, has occurred. It is determined that the rotation speed fluctuation is due to an abnormality.

In the abnormality processing control that is performed when it is determined that there is an abnormality in the above abnormality judgment control, the electric motor 2 is immediately stopped and an alarm is issued. If it is determined that this is an abnormality due to the lowering operation, the electric motor 2 is driven to the upper side after 13 hours (0.5 seconds in the example) to retract and raise the shutter curtain 1. .

The evacuation operation is stopped after 14 hours (5 seconds in the example). Further, the alarm buzzer 11, which is activated in response to the occurrence of each abnormality, maintains the alarm activation state until the stop push button switch PBS is operated.

On the other hand, in the security control performed when the shutter curtain 1 is not in operation, it is constantly determined whether or not a count value has been input due to the operation of the tacho generator 5. That is, if a count value is input when the shutter curtain 1 is not operating, especially when it is fully closed, it is determined that someone is trying to forcibly push up the shutter curtain 1, and an alarm is issued. .

Furthermore, the reference value change control includes changing constants (sensitivity adjustment) by which the minimum rotation speed, maximum rotation speed, and rotation speed maximum fluctuation value are respectively multiplied in the reference value setting control, resetting the initial value, deleting the initial value, etc. All operations can be performed using push button switches PBU, PBS, and PBD.

In the embodiment of the present invention configured as described above, when the shutter curtain 1 comes into contact with an obstacle during the lowering operation, the motor rotation speed detected based on the frequency of the generated voltage generated by the tacho generator 5 The electric motor 2 is determined to be abnormal based on the decrease in the motor rotation speed, and the electric motor 2 is stopped.

As described above, in the present invention, the presence of an obstacle that obstructs the opening/closing operation of the shutter curtain 1 is detected and the opening/closing operation is stopped. This is done based on the motor rotation speed detected by.

That is, since the motor rotation speed is detected based on the frequency generated by the tacho generator 5, which has little variation due to the power supply environment, noise, etc., the reference value for determining abnormal operation due to an obstacle can be determined with extremely high accuracy. It will be possible to set it. Therefore, in cases where obstacle detection is performed based on the supply current and voltage of the electric motor 2, which vary greatly depending on the power supply environment, noise, etc., the reference value is set too loosely and the detection sensitivity of obstacle detection decreases. Obstacle detection can be performed with extremely high sensitivity without any interference, and as a result, the reliability of the safety device can be significantly improved.

Moreover, since it can be configured extremely easily using an inexpensive tacho generator 5, a highly reliable safety device can be provided at a low cost, thereby greatly contributing to the spread of safety devices.

[Operations and Effects] In summary, since the present invention is constructed as described above, the present invention detects an obstacle that obstructs the opening and closing operations of the opening/closing body and stops the operation of the opening/closing body. The above obstacle detection is performed based on the rotational speed of the electric motor. In other words, since the motor rotational speed has little variation due to power supply environment, noise, etc., it is possible to set a reference value for determining abnormal operation due to an obstacle with extremely high accuracy.

Therefore, unlike those that detect obstacles based on the motor load (supply current and voltage of the electric motor), the reference value setting will not be too lenient and the detection sensitivity of obstacle detection will not decrease, and the sensitivity will be extremely high. Good obstacle detection can be performed, and as a result, the reliability of the safety device can be significantly improved.

Moreover, since it can be constructed extremely easily using an inexpensive tacho generator, a highly reliable safety device can be provided at a low cost.

[Brief explanation of drawings]

The drawings show an embodiment of the safety device for the electric shutter for construction according to the present invention, and FIG. 1 is a front view of the electric shutter for construction, and FIG. 2 is a circuit diagram showing the shutter control circuit. , Figure 3 is a flowchart showing the main control, Figure 4 is a flowchart showing the main control.
Fig. 5 is a flowchart showing reference value setting control, Fig. 5 is a flowchart showing abnormality judgment control, Fig. 6 is a flowchart showing abnormality processing control, Fig. 7 is a flowchart showing crime prevention control, and Fig. 8 is a flowchart showing set value change control. FIG. 9 is a waveform diagram showing the operation, and FIG. 10 is a waveform diagram showing a conventional example. In the figure, 1 is a shutter curtain and 2 is an electric motor. 5 is a tacho generator, and 7 is a control unit. Figure 5 6 -Go to 1-

Claims (1)

[Scope of Claims] 1) An electric opening/closing body for buildings that opens and closes by driving an electric motor, the electric opening/closing body for buildings being provided with a rotational speed detection means for detecting the rotational speed of the electric motor; The motor drive control section that controls the drive of the motor is provided with an abnormality determining means that compares the detected value of the rotational speed detecting means with a preset reference value and determines the occurrence of an abnormality based on the comparison result. A safety device for electric opening/closing bodies for construction, which is characterized by: 2) The rotational speed detection means in the first claim is comprised of an AC speed generator connected in conjunction with the electric motor, and a frequency detection means for detecting the frequency of the AC voltage generated by the AC speed generator. A safety device for electric opening/closing bodies for construction, which is characterized by: