Automatic control device for electric sunroof of steel structure factory building

Abstract

The utility model discloses an automatic control device for an electric skylight of a steel structure factory building. The automatic control device comprises a main control board used for controlling opening and closing of the skylight and an HMI touch screen used for controlling the main control board and displaying the state of the skylight. A single-chip microcomputer, a photoelectric isolation module and an MOS tube motor driving module are arranged in the main control board, the HMI touch screen is connected with the single-chip microcomputer, a power supply pin of the single-chip microcomputer is connected with a power supply, the single-chip microcomputer is further connected with the photoelectric isolation module, the photoelectric isolation module is connected with the MOS tube motor driving module, and the MOS tube motor driving module is connected with the HMI touch screen. A signal output terminal of the MOS tube motor driving module is connected with a 24V direct current motor used for pushing a skylight electric telescopic rod; the photoelectric isolation module is used for physically isolating the small-current control circuit with the single chip microcomputer as the core and the large-current drive circuit with the MOS tube motor drive module as the core, mutual influence of control current and drive current is eliminated, and the device is high in safety, low in cost, small in size and convenient to connect.

Description

Technical Field

[0001] The utility model relates to an automatic control technology for an electric skylight, in particular to an automatic control device for an electric skylight of a steel structure workshop. Background Art

[0002] At present, large industrial plants usually use steel structures, which are fast to build and can be flexibly adjusted according to needs. In order to ensure natural ventilation and natural lighting, steel structure industrial plants are generally equipped with skylights. Especially for battery manufacturing, mechanical casting and other fields, there are a large number of heat-generating equipment inside the plant. If the heat cannot be discharged in time in summer, it may cause heatstroke to the staff; at the same time, due to the operation of machines and personnel activities, the indoor air quality decreases, resulting in the deterioration of the indoor working environment. Since the skylights of large plants are high and heavy, they need to be operated with the help of related devices. According to the opening control method of the skylight, it can be mainly divided into manual opening, pneumatic opening and electric opening. The manual method is complicated to operate, and the position should not be too high, preferably 1.3m to 1.5m from the ground; the pneumatic method requires a compressor and a gas tank, which adds additional equipment and will cause new safety hazards. Therefore, electric skylights are currently mainly used. In terms of specific control technology, a 220V DC motor is mainly used to drive the mechanical switch structure of the skylight, and a simple start-stop button is used to control the switch of a single-channel motor. However, once the line is aged or damaged, the 220V high voltage will cause irreparable damage to equipment and personnel, so there are certain safety hazards. For large industrial plants with many skylights, a control system with PLC as the core is used, which has high cost, complex line connection, large size and poor scalability. Utility Model Content

[0003] The utility model aims at an automatic control device for an electric skylight of a steel structure workshop, which has low cost, small volume and high safety.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An automatic control device for an electric skylight of a steel structure workshop, comprising a main control panel for controlling a skylight switch, and an HMI touch screen for operating the main control panel and displaying the skylight status;

[0006] The main control board is provided with a single-chip microcomputer, a photoelectric isolation module and a MOS tube motor drive module. The HMI touch screen is connected to the single-chip microcomputer. The power pin of the single-chip microcomputer is connected to a power supply. The single-chip microcomputer is also connected to a photoelectric isolation module for physically isolating the single-chip microcomputer and the MOS tube motor drive module. The photoelectric isolation module is connected to the MOS tube motor drive module for driving the sunroof motor. The signal output terminal of the MOS tube motor drive module is connected to a 24V DC motor for driving the electric telescopic rod of the sunroof.

[0007] Furthermore, two pins of the single chip microcomputer are respectively connected to a photoelectric isolation module, the photoelectric isolation module is connected to a MOS tube motor driving module, and the signal output terminal of the MOS tube motor driving module is connected to 1-4 electric telescopic rods to form a control channel.

[0008] Furthermore, the control channel has two identical paths.

[0009] Furthermore, the main control board is provided with two slave control board connection ports, and each slave control board has two control channels.

[0010] Furthermore, the single chip microcomputer model is STC8H8K64U.

[0011] Furthermore, the photoelectric isolation module adopts a photoelectric coupling circuit with a TLP521-2 photoelectric coupler as the core.

[0012] Furthermore, the MOS tube motor drive module adopts a forward and reverse drive circuit with 8 SUD50P06 type P-channel MOS tubes and 8 AOD442 type N-channel MOS tubes as the core.

[0013] Furthermore, the main control board is provided with a fire signal serial port terminal connected to an external fire protection system.

[0014] Furthermore, the main control board is provided with a WiFi module serial port terminal connected to the external communication module.

[0015] Furthermore, the main control board is provided with an A / D sampling signal terminal connected to an external wind speed sensor.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The main control board of the utility model is provided with a single-chip microcomputer, a photoelectric isolation module and a MOS tube motor drive module connected in sequence. The single-chip microcomputer is connected to a 5V power supply, and the MOS tube motor drive module is used to drive the 24V DC motor that pushes the telescopic rod of the sunroof. The photoelectric isolation module is used to physically isolate the small current control circuit with the single-chip microcomputer as the core and the large current drive circuit with the MOS tube motor drive module as the core, thereby eliminating the mutual influence of the control current and the drive current. Compared with the PLC module, the price of the single-chip microcomputer is significantly reduced. In addition, by connecting multiple sunroofs in the same area in parallel, the system cost can be reduced. At the same time, it also has the characteristics of smaller size and convenient wiring.

[0018] 2. The utility model will use a 24V low-voltage DC motor to drive the skylight, avoiding the harm caused by high-voltage leakage in the steel structure factory building, and is safer.

[0019] Furthermore, the utility model is provided with two slave control board connection ports on the main control board for connecting slave control boards to achieve functional expansion. Each level of slave control board can control two skylights, and each can control four 24V motors in parallel. The number of slave control boards can be selected according to the actual number of skylights to be controlled, thereby further reducing costs and increasing the scalability of the device.

[0020] Furthermore, the utility model adopts a single-chip microcomputer STC8H8K64U, which has built-in 8K RAM and 64K Flash memory, and can achieve more functions only by upgrading the software program without modifying or simply changing the hardware settings.

[0021] Furthermore, a fire signal serial port terminal is provided on the main control board of the utility model, which is connected to an external fire protection system through the serial port, receives the fire signal, and works together with the fire protection system. In the event of a fire, the skylight can be automatically opened to discharge smoke in time, thereby buying more time for extinguishing the open fire or evacuating personnel, or the skylight in the designated area can be closed to prevent the fire from spreading.

[0022] Furthermore, a WiFi module serial port terminal is provided on the main control board of the utility model, which is connected to an external communication module through the serial port. By accessing the Internet of Things system, the geographical location of the sunroof and the status information of the sunroof are automatically uploaded to the cloud platform, thereby realizing remote visualization of the sunroof status; and the function of receiving remote commands can be further increased, automatically receiving and executing the sunroof action commands issued from the cloud platform, thereby realizing remote control.

[0023] Furthermore, an A / D sampling signal terminal is provided on the main control board of the utility model. By connecting to a wind speed sensor, the skylight is opened or closed autonomously when the outdoor wind speed reaches a specified threshold, thereby achieving the goals of energy saving and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the structural block diagram of the main control board of the utility model;

[0025] Figure 2 This is the structural block diagram of the slave control board of the utility model;

[0026] Figure 3 This is a schematic diagram of I / O resource allocation for the single-chip microcomputer of the utility model;

[0027] Figure 4 This is the circuit schematic diagram of the photoelectric isolation module of the utility model;

[0028] Figure 5 This is the circuit schematic diagram of the MOS tube motor drive module of the utility model;

[0029] Figure 6 This is the main interface diagram of the HMI touch screen control of the utility model;

[0030] Figure 7 This is the HMI touch screen parameter setting interface diagram of the utility model. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0032] See also Figure 1 The utility model includes a main control board and a 24V DC motor connected to and controlled by the main control board for driving an electric telescopic rod for a sunroof. The electric telescopic rod drives the sunroof connected thereto to be opened and closed. The main control board is also connected to an HMI touch screen that can control the sunroof switch and display the state of the sunroof.

[0033] The main control board is provided with a control core single-chip microcomputer, a photoelectric isolation module and a MOS tube motor drive module. The power pin of the single-chip microcomputer is connected to a 5V power supply. The single-chip microcomputer, the photoelectric isolation module and the MOS tube motor drive module are sequentially connected to the main control board to form two identical control channels, namely control channel 1 and control channel 2. Taking control channel 1 as an example, two adjacent pins of the single-chip microcomputer are respectively connected to a photoelectric isolation module as "on" and "off" signals to form a small current control circuit with the single-chip microcomputer as the core. The two photoelectric isolation modules are connected to the MOS tube motor drive module to form a large current drive circuit with the MOS device as the core. The MOS tube motor drive module is connected in parallel by a MOS device group, and its signal output terminal is connected to a 24V DC motor for driving 1-4 electric telescopic rods. The 1-4 electric telescopic rods are connected in parallel to control two skylights in adjacent areas. The two skylights use the same control signal and have exactly the same action mode. The sunroof "open" or "close" command is sent to the MCU in the main control board through the HMI touch screen. The small current control circuit with the MCU as the core and the large current drive circuit with the MOS device as the core are physically isolated using the photoelectric coupling circuit, eliminating the mutual influence of the control current and the drive current. The MOS tube motor drive module then drives the DC motor that controls the sunroof electric telescopic rod to complete the "opening" and "closing" of the sunroof. The 2 control channels on the main control board can control up to 4 sunroofs.

[0034] The main control board is provided with a serial port terminal for external connection. The HMI touch screen is connected to the serial port terminal on the main control board using the RS485 electrical standard and ModbusRTU serial communication protocol. It is responsible for displaying the current status of each channel skylight and controlling the opening and closing of each channel skylight. The main control board also reserves fire signal serial port terminals, A / D sampling signal terminals and WiFi module serial port terminals. The fire signal serial port terminals use serial port communication to access fire system signals, complete the linkage of fire signals, and return corresponding action result information; the A / D sampling signal terminal is connected to the wind speed sensor, and uses ADC (analog / digital conversion) to complete the sampling of analog quantities. The sampled digital signal enters the main control chip. According to the pre-set control logic, the skylight can be opened or closed autonomously when the outdoor wind speed reaches the specified threshold, thereby achieving the goals of energy saving and safety; the WiFi module serial port terminal uses serial port communication, and an external communication module such as ESP8266 is connected to the enterprise's internal network or the Internet of Things cloud platform to automatically upload the geographical location and status information of the skylight, thereby realizing remote visualization of the skylight status, and the function of remote commands can be further increased to automatically receive and execute skylight action commands issued by the network to realize remote control.

[0035] The main control board is equipped with two connection ports that can be connected to the outside to expand the main control board. The two connection ports can connect up to two slave control boards. Each slave control board controls two electric sunroofs. The number of sunroofs to be controlled can also be reduced accordingly. Figure 2 The specifications of the two slave control boards are the same. According to the different ports connected to the main control board, they control channel 3-channel 4 or channel 5-channel 6 respectively. Each slave control board includes a photoelectric isolation module for 2 control channels, a MOS tube motor drive module and corresponding signal output terminals.

[0036] The utility model can control up to 6 electric skylights, where the control loop of each control channel can be composed of 1-4 electric telescopic rods in adjacent areas. The electric telescopic rods in the same control loop are connected in parallel, use the same control signal, and have the same action mode. The device includes a two-level structure of a main control panel and a slave control panel, which can be flexibly combined according to the scale of the factory skylight.

[0037] The main control board MCU uses STC8H8K64U chip, and its resource allocation is shown in Figure 3, STC8H8K64U chip has 40 pins, of which P1.8 pin is connected to 5V power supply VCC, P2.0 pin is connected to GND, the "open" and "close" control signals of the two control loops of the main control board use four pins P0.4-P0.7 respectively, and the "open" and "close" control signals of the four control loops of the two slave control boards use eight pins P2.0-P2.7 respectively. Taking the first route as an example, P0.4 is the sunroof opening control, and P0.5 is the sunroof closing control; it is connected to the HMI touch screen using RS485 serial port, using serial port 2, pins P1.0 / RXD2 and P1.1 / TXD2; the fire protection system uses the reserved serial port 3, pins P0.0 / RXD3 and P0.1 / TXD3; the WiFi communication module uses the reserved serial port 4, pins P0.2 / RXD4 and P0.3 / TXD4. The wind speed sensor is an analog input, and the ADC sampling interface 3 is reserved, the pin is P1.3 / ADC3.

[0038] The photoelectric isolation module and MOS tube motor drive module are the core of this device. The photoelectric isolation module adopts the photoelectric coupling circuit with TLP521-2 as the core. The MOS tube motor drive module adopts 8 SUD50P06 P-channel MOS tubes and 8 AOD442 N-channel MOS tubes as the core of the forward and reverse drive circuit. The maximum pulse current of a single MOS tube is 80A, and the maximum continuous working current is 30A, which achieves the goal of reliably controlling and driving the strong current execution motor through weak current signals. The current of the control loop with STC8H8K64U chip as the core is about tens to hundreds of mA. The execution loop with MOS tube motor drive module as the core needs to drive 1-4 electric telescopic rods in parallel, with a current of about 30A. At the moment of the motor forward and reverse start, the current can reach 60-80A. Therefore, the control loop and the execution loop must be physically isolated through the photoelectric coupling circuit. At the same time, in order to improve the reliability and stability of the system, a redundant design of dual optocouplers and multi-MOS tubes in parallel is also adopted.

[0039] Take control channel 2 as an example, its optoelectronic isolation module circuit and MOS tube motor drive module circuit are shown in Figure 4 and Figure 5 , see Figure 4 Each TLP521-2 optocoupler device contains two independent optocoupler modules. The open control signal of channel 2 is given by P06, which is effective at high level, and the output signals are "Mof+2" and "Mof-2". The close control signal is given by P07, which is also effective at high level, and the output signals are "Moz+2" and "Moz-2". See Figure 5Each motor is controlled by a set of signals "MD02A" and "MD02B". "MD02A" is given by "Moz+2" and "Mof-2", and "MD02B" is given by "Mof+2" and "Moz-2".

[0040] After executing the channel 2 open action command, P06 is set to a high level and P07 is set to a low level. At this time, the light-emitting diode in the optocoupler where P06 is located emits light, and the photosensitive device generates a photocurrent after receiving the light. The transistor is turned on, and the "Mof+2" and "Mof-2" pins both become 12V. At this time, the gate voltage of the AOD442 type N-channel MOS tube connected to the "Mof-2" pin is +12V, the collector voltage is 0V, and the voltage difference between the gate and the collector is 12V, which meets the conduction condition. After conduction, the "MD02A" pin is pulled down to 0V. The gate voltage of the SUD50P06 type P-channel MOS tube connected to the "Mof+2" pin is +12V, the collector voltage is +24V, and the voltage difference between the gate and the collector is -12V, which meets the conduction condition. After conduction, the "MD02B" pin is pulled up to +24V. That is, after executing the opening action command, "MD02A" is 0V, "MD02B" is +24V, the motor rotates forward, the telescopic rod extends, and the electric sunroof is opened.

[0041] After executing the channel 2 closing action command, P06 is set to a low level and P07 is set to a high level. At this time, the light-emitting diode in the optocoupler where P07 is located emits light, and the photosensitive device generates a photocurrent after receiving the light. The transistor is turned on, and the "Moz+2" and "Moz-2" pins both become 12V. At this time, the gate voltage of the SUD50P06 type P-channel MOS tube connected to the "Moz+2" pin is +12V, the collector voltage is +24V, and the voltage difference between the gate and the collector is -12V, which meets the conduction condition. After conduction, the "MD02A" pin is pulled up to +24V. The gate voltage of the AOD442 type N-channel MOS tube connected to the "Moz-2" pin is +12V, the collector voltage is 0V, and the voltage difference between the gate and the collector is 12V, which meets the conduction condition. After conduction, the "MD02B" pin is pulled down to 0V. That is, after executing the closing action command, "MD02A" is +24V, "MD02B" is 0V, the motor is reversed, the telescopic rod is retracted, and the electric sunroof is closed.

[0042] After executing the channel 2 stop action command, P06 and P07 are both set to low level. At this time, all MOS tubes are not turned on, there is no voltage difference between "MD02A" and "MD02B", the motor does not move, and the electric sunroof is in a stopped state.

[0043] The HMI touch screen can display the current status of all control channels and can issue control commands through manual touch operation. The commands are sent to the STC8H8K64U chip via the ModbusRTU serial communication protocol. The chip parses and restores the command data according to the protocol, and finally executes the action as required to complete the opening, closing or stopping control of the skylight of the corresponding channel. Figure 6 , the left side of the main interface of the HMI touch screen is the control button, such as the opening command of channel 1 is the green button "Open 1", the closing command is the yellow button "Close 1", and the stop command is the red button "Stop 1". The control switches of channel 2-channel 6 are similar to channel 1. The lower left is the command for controlling the 6 channels at the same time, which are the green button "Open All", the yellow button "Close All", and the red button "Stop All". The right side of the interface is the real-time information of the skylight of each channel. The red progress bar shows the progress of opening, and the text shows the action status of the current channel. The lower left corner of the interface is the status of the fire signal. Green means "no fire signal" and red means "fire alarm occurs". The skylight needs to be automatically opened or closed according to the settings. The "Parameter Setting" button is in the lower right corner of the interface. Press it to enter the parameter setting interface.

[0044] See the settings interface for Figure 7 , on the left are the communication protocol parameter settings and fire linkage mode settings. The HMI touch screen and the main control panel communicate via the ModbusRTU serial communication protocol, and the correct "slave address", "working mode" and "control quantity" need to be set; the fire linkage mode setting can choose "fire alarm window opening" or "fire alarm window closing", which can be flexibly selected according to the area where the skylight is located. On the right side of the interface are the settings for the window opening and closing speeds of each channel, which can be adjusted according to the travel of the telescopic rod and the size of the skylight. At the bottom right of the interface is the "Return" button, which returns to the main control interface.

[0045] When this solution is implemented, a typical situation is that two electric telescopic rods control one skylight, and two adjacent skylights have a total of four electric telescopic rods connected in parallel to form a control channel. The number of slave control panels is selected according to the number and distance of skylights. One system can control up to 6 channels and a total of 12 skylights. The main control panel and the slave control panel are fixed in the control cabinet, which is installed on the side wall of the factory building at a height of 1.5 meters from the ground. The user can view the status of the skylights in this area through the HMI touch screen, and issue corresponding commands by pressing the display buttons on the touch screen as needed. The command execution status is displayed on the screen in real time.

Claims

1. An automatic control device for electric skylights of steel structure workshops, characterized in that: It includes a main control panel for controlling the sunroof switch, and an HMI touch screen for operating the main control panel and displaying the sunroof status; The main control board is provided with a single-chip microcomputer, a photoelectric isolation module and a MOS tube motor drive module. The HMI touch screen is connected to the single-chip microcomputer. The power pin of the single-chip microcomputer is connected to a power supply. The single-chip microcomputer is also connected to a photoelectric isolation module for physically isolating the single-chip microcomputer and the MOS tube motor drive module. The photoelectric isolation module is connected to the MOS tube motor drive module for driving the sunroof motor. The signal output terminal of the MOS tube motor drive module is connected to a 24V DC motor for driving the electric telescopic rod of the sunroof.

2. The automatic control device for electric skylights of steel structure workshops according to claim 1 is characterized in that: The two pins of the single chip microcomputer are respectively connected to a photoelectric isolation module, the photoelectric isolation module is connected to a MOS tube motor drive module, and the signal output terminal of the MOS tube motor drive module is connected to 1-4 electric telescopic rods to form a control channel.

3. The automatic control device for electric skylights of steel structure workshops according to claim 2 is characterized in that: The control channel has two identical paths.

4. The automatic control device for electric skylights of steel structure workshops according to claim 3 is characterized in that: The main control board is provided with two slave control board connection ports, and each slave control board has two control channels.

5. The automatic control device for electric skylights of steel structure workshops according to any one of claims 1 to 4, characterized in that: The microcontroller model is STC8H8K64U.

6. The automatic control device for electric skylights of steel structure workshops according to claim 1 is characterized in that: The photoelectric isolation module adopts a photoelectric coupling circuit with a TLP521-2 photoelectric coupler as the core.

7. The automatic control device for electric skylights of steel structure workshops according to claim 1 is characterized in that: The MOS tube motor drive module adopts a forward and reverse drive circuit with 8 SUD50P06 type P-channel MOS tubes and 8 AOD442 type N-channel MOS tubes as the core.

8. The automatic control device for electric skylights of steel structure workshops according to claim 1 is characterized in that: The main control board is provided with a fire signal serial port terminal connected to an external fire protection system.

9. The automatic control device for electric skylights of steel structure workshops according to claim 1, characterized in that: The main control board is provided with a WiFi module serial port terminal connected to the external communication module.

10. The automatic control device for electric skylights of steel structure workshops according to claim 1, characterized in that: The main control board is provided with an A / D sampling signal terminal connected to an external wind speed sensor.

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