CN205567191U - Big -arch shelter LED lighting device based on PLC control - Google Patents

Abstract

The utility model discloses a greenhouse LED lighting device based on PLC control, which comprises a bridge frame, a PLC controller and several LED lighting boxes. The beam set on the top of the support frame, PLC controller, LED red light sensor, LED blue light sensor and LED far red light sensor are installed on the support frame, and LED lighting boxes are installed at both ends of the beam; the LED lighting box includes Extensible hanging rods, top boards, heat sinks and lamp boards. A number of LED red lights, LED blue lights and LED far-red lights are arranged on the lower surface of the lamp boards. The upper surface of the lamp boards is closely attached to the lower surface of the heat sink. On the surface, the corresponding LED red light driver, LED blue light driver and LED far red light driver are installed on the upper surface of the cooling plate. The utility model has a simple and delicate structure, and the LED lamp has low heat, and can be widely used in various growth stages of plants.

Description

A greenhouse LED lighting device based on PLC control

technical field

The utility model relates to a lighting device, in particular to a greenhouse LED lighting device based on PLC control.

Background technique

The process of plant growth and development is an extremely complex life phenomenon, which is not only determined by the genetic characteristics of the plant itself, but also affected by external environmental conditions. Light is the energy source of plant photosynthesis, and its intensity has a great impact on plant growth and development. For most plants, light quality refers to the spectral composition of light received by plants, and different spectral bands have different effects on plants. Plants Through the various pigment systems in the body, it senses light in different wavelength ranges and regulates the growth, development and metabolism of plants. A large number of studies have shown that red light and blue light are the two most important spectra for plant growth. Red light affects the plant's leaf expansion, dry matter accumulation and stem elongation. Blue light affects the growth of leaves and stems of plants.

At present, fluorescent lamps are mainly used as artificial light sources in the field of plant supplementary light. By changing the composition of phosphor powder, the peak range of the fluorescent lamp spectrum is changed. At the same time, high-pressure sodium lamps and daylight-colored dysprosium lamps are also used. These light sources are selected based on the adaptability of the human eye to light, and many unnecessary wavelengths in the spectrum do not necessarily promote the growth of crops. Moreover, these light sources generate more heat and infrared radiation, and it is necessary to use optical filters or heat-absorbing filters to narrow the spectrum to obtain a spectral distribution that meets the requirements. It is impossible to perform accurate simulations based on the composition of actual light intensity and spectrum between different crops and fields. Moreover, the spectrum of the traditional plant growth supplementary light source is a continuous composite spectrum, which cannot regulate parameters such as the ratio of red and blue light quality, and cannot supplement the light according to the needs of the plants themselves. A considerable part of the spectrum is wasted, resulting in low supplementary light efficiency. Moreover, these are all thermal light sources, and the surface temperature is high, which leads to an increase in the temperature of the plant growth environment, which is not conducive to plant growth, and requires the use of high-power fans, air conditioners and other refrigeration equipment, resulting in increased operating costs. At the same time, traditional light sources contain some harmful substances to the plant growth environment, such as mercury, lead and other harmful substances in fluorescent lamps.

At present, there is no equipment in China that uses a combined LED array light source to simulate a specific spectrum for plant cultivation. When using LED arrays as a light source for space plant cultivation, it is mainly to choose a fixed spectral band. Although this light source device considers the special spectrum of plant growth, the light source for cultivation has a fixed spectrum and does not have the function of adjusting the spectrum components.

Although ordinary LED plant growth lamps have the advantages of energy saving, no pollution, and long life, most of them can only simply control and customize the ratio of red and blue. Regulation has not yet matured products. At the same time, the disadvantage of LED is that the output spectrum is narrow, and it needs at least a combination of blue light and red light to meet the growth needs of plants.

Utility model content

Purpose of the invention: the purpose of this utility model is to solve the deficiencies in the prior art and provide a greenhouse LED lighting device based on PLC control. It is used to supplement light for plant growth inside the greenhouse, and use PLC to realize the precise control of illuminance, light color ratio and photoperiod of the plant growth supplement light lighting system. It is a long-term, reliable and energy-saving supplement light system used in the process of plant growth. , and make its spectral composition adjustable and stable output, simulating the absorption spectrum lighting of plants, and then promote plant growth in a targeted and efficient manner.

Technical solution: A greenhouse LED lighting device based on PLC control of the utility model includes a bridge frame, a PLC controller and several LED lighting boxes. The bridge frame includes several subunits arranged up and down, and each subunit includes a ground The support frame and the beam horizontally arranged on the top of the support frame, PLC controller, LED red light sensor, LED blue light sensor and LED far red light sensor are installed on the support frame, LED lighting boxes are installed at both ends of the beam The LED lighting box includes a telescopic hanging rod, a top plate, a heat dissipation plate and a lamp plate, the hanging rod is suspended on the beam of the bridge frame, the top plate, the heat dissipation plate and the light plate are fixed on the hanging rod in turn from top to bottom, and the bottom of the light plate There are several LED red lights, LED blue lights and LED far red lights arranged on the surface, the upper surface of the lamp board is closely attached to the lower surface of the cooling plate, and the corresponding LED red light driver is installed on the upper surface of the cooling plate , LED blue light driver and LED far red light driver;

Among them, the control program is input to the PLC controller through the corresponding programmer, and each sensor transmits the light value collected in real time to the PLC controller. The PLC controller updates and calculates the light control command according to the corresponding data in real time, and each driver receives the control command. Finally, control the operation of the corresponding LED lights in time.

Further, the size of the bridge and the number of LED lighting boxes are determined according to the actual planting area of the greenhouse. In order to enhance the stability of the whole device, the support frame is in the shape of a "herringbone", and the support frame is also equipped with A/D converter and The D/A converter converts the corresponding signal.

Further, the top plate, the heat dissipation plate and the lamp plate are circular, and the hanging rods are fixedly installed through the radial side edges of the top plate, the heat dissipation plate and the light plate in turn, and the heat dissipation plate is also equipped with a temperature protector and an alarm. Red light, LED blue light and LED far red light are arranged concentrically on the light board from outside to inside, using PWM pulse modulation technology to control the brightness of red, blue and far red LED lights respectively through corresponding drivers to meet the light demand of different crops.

Among them, the above-mentioned temperature protector can prevent the LED lamp from being damaged due to the overheating of the lamp board after the heat dissipation air duct is blocked or the fan is damaged, and the LED lamp is damaged. At this time, the temperature protector will automatically cut off the power supply of the whole lamp, so as to protect the LED lamp, and KI-31 series products can be used. The above-mentioned alarm can prevent the failure of the lighting device, for example, a buzzer is used.

Further, the wavelength of the LED red light is 600-700nm (such as 660nm), the wavelength of the LED blue light is 400-500nm (such as 450nm), the wavelength of the LED far-red light is 730nm, the LED red light, LED The quantity ratio of blue light and LED far-red light is 2:1:2, forming a light source board with adjustable intensity and proportion and uniform illumination, which can simulate the internal light environment of different planting groups. The ratio of 730nm far-red light to 660nm red light and 450nm red light can be used to build crop height, internode length, etc., and the flowering cycle can be precisely controlled by 730nm far-red light irradiation without relying only on Influenced by seasons.

Further, the lamp board, heat dissipation board and top board are all made of aluminum (hard, high strength and good thermal conductivity), the hanging rod is made of steel (enhanced stability), and each LED lamp is made of The heat-conducting silica gel will be pasted on the light board, and the light board will be pasted on the heat sink plate through heat-conducting silica gel. The heat sink plate is made of aluminum substrate coated with low-temperature high-radiation paint (such as titanium dioxide). 220mm, the hanging rod and the lamp board, heat sink board and top board are respectively fixed by nuts.

Further, the two ends of the A/D converter are respectively connected to each sensor and the PLC controller through the RS485 signal line, and the two ends of the D/A converter are also respectively connected to the PLC controller and each driver through the RS485 signal line.

Beneficial effect: compared with the prior art, the utility model has the following advantages:

(1) The utility model adopts LED lamp as a monochromatic light source, which can obtain the required light intensity and light quality ratio through adjustment according to different plants, environments, and growth stages. It has the automatic adjustment function of light intensity and light quality, and can be applied Because plants are at various stages of growth; and monochromatic high-power LEDs are used as cold light sources, which can irradiate plants at close range without burning plants, thereby increasing space utilization;

(2) The utility model effectively controls the volume and quality of the LED plant lamp, so that it is light and easy to install;

(3) The utility model solves the problem of cost and benefit of supplementing light for plants, and can supplement light for plants at any time, in time, on demand, and in a periodic manner, and can also prevent waste of bottles caused by excessive supplementary light;

(4) The utility model can monitor the environment in real time and automatically adjust it to realize the intelligent control of the supplementary light system, save manpower and time, and can carry out integrated control of intelligent lighting devices. The control method is simple and convenient, and does not require manual detection and operation, saving manpower;

(5) The LED lamp used in this utility model is a semiconductor light source, does not contain harmful substances such as mercury and lead, is friendly to the natural environment, and has a long lifespan, with a theoretical lifespan of more than 50,000 hours, which is much higher than traditional plant lighting such as fluorescent lamps Artificial light sources can effectively reduce replacement and maintenance costs.

To sum up, the utility model has a simple and exquisite structure, and the LED lamp has low heat, and can be widely used in various stages of plant growth.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the greenhouse LED lighting device based on PLC control in this implementation;

Fig. 2 is a schematic diagram of the working principle of the utility model;

Fig. 3 is a schematic diagram of electrical structure in the utility model;

Figure 4 is a schematic diagram of the lighting box in this embodiment;

Fig. 5 is a schematic diagram of the lighting box in this embodiment;

Fig. 6 is the structural representation of heat dissipation plate in this implementation;

Fig. 7 is a schematic structural diagram of the lamp panel in this embodiment.

detailed description

The technical solutions of the utility model are described in detail below, but the protection scope of the utility model is not limited to the embodiments.

As shown in Figure 1, the greenhouse LED lighting device based on PLC control of the present embodiment includes a bridge frame 14, a PLC controller 13 and several LED lighting boxes, and the bridge frame 14 includes subunits arranged up and down in several levels, and each subunit includes Set the support frame on the ground and the beam horizontally arranged on the top of the support frame. PLC controller 13, red light sensor 10, blue light sensor 11 and far-red light sensor 12 are installed on the support frame, and LED lighting boxes are installed at both ends of the beam The LED lighting box includes a telescopic hanging rod 1, a top plate 9, a heat dissipation plate 8 and a lamp plate 7, the hanging rod 1 is suspended on the crossbeam of the bridge frame 14, and the top plate 9, the heat dissipation plate 8 and the lamp plate 7 are fixed on the Hanging bar 1, on the lower surface of lamp board 7, there are arranged some LED red light lamps 2, LED blue light lamps 3 and LED far red light lamps 4 (three kinds of lamps are combined in a certain proportion to form intensity and ratio can be adjusted arbitrarily, illumination Uniform light source board can simulate the internal light environment of different planting groups), the upper surface of lamp board 7 is close to the lower surface of heat dissipation plate 8, and the upper surface of heat dissipation plate 8 is equipped with corresponding LED red light driver 18, LED blue light driver 17 and LED far red light driver 19.

As shown in Figure 2 and Figure 3, the control program is input to the PLC controller 13 through the corresponding programmer, and each sensor transmits the illumination value collected in real time to the PLC controller 13, and the PLC controller 13 updates and calculates the illumination according to the corresponding data in real time. Control instructions, each driver controls the operation of the corresponding LED lights in time after receiving the control instructions.

Among them, the overall structural frame of the utility model is composed of steel trough cable bridge 14, which is used for laying lines between system components, and has good effects on shielding interference of lines and protection of lines in heavy corrosion environment.

The length of the telescopic hanging rod 1 can be adjusted according to the actual situation, that is, the height of each LED lighting box can be adjusted individually. The size of bridge frame 14 and the quantity of LED lighting boxes are determined according to the actual planting area of the greenhouse.

As shown in Figures 4 to 7, the top plate 9, the heat dissipation plate 8 and the lamp plate 7 are circular, and the hanging rod 1 runs through the radial side edges of the top plate 9, the heat dissipation plate 8 and the light plate 7 in turn and is fixedly installed, and the heat dissipation plate 8 There is also a temperature protector 5 and an alarm 6, the lamp board 7, the heat sink 8 and the top board 9 are all made of aluminum, the hanging rod 1 is made of steel, and each LED lamp is pasted on the lamp board 7 by heat-conducting silica gel. , the light board 7 is pasted on the heat sink 8 through thermal silica gel, the heat sink 8 is an aluminum substrate coated with low-temperature high-radiation paint, the diameter of the heat sink 8 and the light board 7 is 200mm, and the A/D converter 15 of the top plate 9 is The two ends are respectively connected to each sensor and PLC controller 13 through RS485 signal lines, and the two ends of D/A converter 16 are also respectively connected to PLC controller 13 and each driver through RS485 signal lines.

The LED lights of the same color are evenly distributed on the circular substrate: 12 red LED lights 2 are evenly distributed in a ring on the light board 7, and the diameter of the ring is 180mm; 12 far-red LED lights 4 are on the light board 7 The rings are evenly distributed, and the diameter of the ring is 120 mm; the 6 blue LED lights 3 are also evenly distributed in a ring on the lamp 7 board, and the diameter of the ring is 60 mm. The LED lamps can use OSLON SSL new ultra-compact high-power LEDs (3mm×3mm×2.35mm) produced by OSRAM Opto Semiconductors, with a beam angle of 150 °.

In this embodiment, PWM pulse modulation technology is used to control the brightness of the three groups of red, blue and far red LED lights respectively to meet the light requirements of different crops. The LED light array is controlled by PWM signals, and the red LED lights use the central wavelength The narrow-band red light is 660nm, the blue LED light uses narrow-band blue light with a center wavelength of 450nm, and the far-red LED light uses narrow-band far-red light with a center wavelength of 730nm. Each LED lighting box contains 12 red lights, 6 blue lights and 12 far red lights. The red light, blue light and far red light LED arrays work independently, and when the PWM duty cycle is 1, the maximum light brightness is achieved.

Concrete working principle of the present utility model is:

(1) input corresponding control program in the PLC controller 13 according to the plant species and the growth state in the greenhouse, the program input device can adopt the supporting programmer or computer of the PLC controller 13;

(2) LED lighting device system initialization in the utility model, each red light sensor 10, blue light sensor 11 and far-red light sensor 12 in the greenhouse detect the interior illumination value of the greenhouse, and transmit in the PLC controller 13;

(3) The control program in the PLC controller 13 draws the control instruction of the LED lighting box according to the light quality ratio and the light intensity value of the real-time illumination situation inside the greenhouse and the real-time required illumination of the plants in the greenhouse;

(4) control instruction is transmitted to each LED red light driver 18, LED blue light driver 17 and LED far red light driver 19 by data cable;

(5) each LED red light driver 18, LED blue light driver 17 and LED far red light driver 19 control the operation of corresponding LED lights;

(6) When the lighting in the greenhouse changes or the lighting requirements of the plants in the greenhouse change, the PLC controller 13 sends a new control command to the drive device, and the operating state of the LED lighting device changes appropriately.

The entire device in this embodiment adopts the RS485 communication protocol, and the RS485 signal line can use RVSP twisted-pair shielded lines. PLC controller 13 can adopt FX3U series Mitsubishi PLC, PLC controller 13 realizes program programming and input through RS485 through computer or PLC programmer, according to the input program PLC controller 13 calculates the expected spectrum and illuminance and controls and manages the entire light source system . A/D converter 15 and D/A converter 16 adopt Mitsubishi A/D, D/A conversion module FX2N-4AD, and PLC controller 13, red light sensor 10, blue light sensor 11 and far red light sensor 12 adopt built-in power supply. The power supply of each LED light driver can be uniformly drawn from the 220V line outside the greenhouse.

The driver of each LED lamp can be driven by OSRAM Osram ET-LED 30W LED lamp cup special electronic transformer 12V adjustable power supply, and each color LED lamp in each lighting box has an independent power driver, respectively using pulse width modulation (PWM) way to realize the continuous and independent adjustment of the radiation intensity of each lamp.

In the above embodiments, the ISL29010 light sensor can be used for light detection, because the sensor cannot detect monochromatic light, so a layer of band-pass filters with corresponding wavelength ranges are added in front of each sensor. The center wavelength of the filter added before the red light sensor 10 is 660nm, the center wavelength of the filter added before the blue light sensor 11 is 450nm; the center wavelength of the filter added before the far red sensor 12 is 730nm.

Claims (6)

1. A greenhouse LED lighting device based on PLC control, characterized in that: it comprises a bridge frame, a PLC controller and several LED lighting boxes, the bridge frame includes subunits arranged up and down in several levels, and each subunit includes a ground The support frame and the beam horizontally arranged on the top of the support frame, PLC controller, LED red light sensor, LED blue light sensor and LED far red light sensor are installed on the support frame, and LED lighting boxes are installed at both ends of the beam; The LED lighting box includes a telescopic hanging rod, a top plate, a heat dissipation plate and a lamp board. The hanging rod is suspended on the beam of the bridge frame. There are a number of LED red lights, LED blue lights and LED far red lights arranged on the upper surface. The upper surface of the lamp board is closely attached to the lower surface of the heat sink. The upper surface of the heat sink is installed with a corresponding LED red light driver, LED blue light driver and LED far red light driver; Among them, the control program is input to the PLC controller through the corresponding programmer, and each sensor transmits the light value collected in real time to the PLC controller. The PLC controller updates and calculates the light control command according to the corresponding data in real time, and each driver receives the control command. Finally, control the operation of the corresponding LED lights in time. 2. The greenhouse LED lighting device based on PLC control according to claim 1, characterized in that: the size of the bridge and the number of LED lighting boxes are determined according to the actual planting area of the greenhouse, and the supporting frame is in the shape of a "herringbone", supporting There are also A/D converters and D/A converters on the shelf. 3. The LED lighting device for greenhouses based on PLC control according to claim 1, characterized in that: the top plate, heat dissipation plate and lamp plate are circular, and the hanging rods run through the radial two sides of the top plate, heat dissipation plate and lamp plate in sequence. The side edges are fixedly installed, and there are also temperature protectors and alarms on the heat sink. LED red lights, LED blue lights and LED far-red lights are arranged concentrically on the light board from the outside to the inside. 4. The greenhouse LED lighting device based on PLC control according to claim 3, characterized in that: the wavelength of the LED red light is 600-700nm, the wavelength of the LED blue light is 400-500nm, and the wavelength of the LED far-red light The wavelength of the LED is 730nm, and the ratio of the number of LED red light, LED blue light and LED far red light is 2:1:2. 5. The greenhouse LED lighting device based on PLC control according to claim 1, characterized in that: the lamp board, the heat dissipation board and the top board are all made of aluminum, the hanging rod is made of steel, and each of the The LED lamp is pasted on the lamp board by heat-conducting silica gel, and the lamp board is pasted on the heat sink plate by heat-conducting silica gel. The heat sink plate is made of an aluminum substrate coated with low-temperature and high-radiation paint. The diameter of the heat sink plate and the light board is 200mm, and the diameter of the top plate is 220mm. , the hanging rod and the lamp board, the heat dissipation board and the top board are respectively fixed by nuts. 6. The greenhouse LED lighting device based on PLC control according to claim 2, characterized in that: the two ends of the A/D converter are respectively connected to each sensor and the PLC controller through the RS485 signal line, and the D/A conversion The two ends of the device are also connected to the PLC controller and each drive through the RS485 signal line.