Multi-harmonic constant temperature device for seedling development

Abstract

The seedling development multi-harmonic constant temperature device comprises a cultivation bin, and a multi-harmonic temperature control module, an infrared thermal imaging sensor, a root system temperature sensing probe, an intelligent regulation and control system, an environment coupling module and a seedling tray are arranged in the cultivation bin; the multi-harmonic temperature control module is composed of a PTC ceramic heating sheet, a semiconductor chilling plate and a Helmholtz resonant cavity, and uniform distribution of a temperature field is achieved by superposing thermal waves with different frequencies; the seedling tray is arranged at the bottom in the cultivation bin, the root system temperature sensing probe is arranged on the seedling tray, and the infrared thermal imaging sensor is installed on the portion, over the seedling tray, of the cultivation bin; the combined light sources are distributed at the tops of the cultivation bins; the intelligent regulation and control system carries an STM32 main control chip and receives feedback signals of the infrared thermal imaging sensor and the root system temperature sensing probe in real time; and the environment coupling module comprises a photosynthetically active radiation sensor and a matrix humidity sensor, and realizes multi-parameter coordinated regulation and control through a fuzzy PID (Proportion Integration Differentiation) algorithm. The device is accurate in temperature control, remarkable in energy conservation, high in self-adaption and low in cost.

Description

Technical Field

[0001] The present invention relates to a multi - harmonic constant - temperature device for seedling development, belonging to the technical field of seedling cultivation. Background Art

[0002] The seedling cultivation technology is the core basic technology in the fields of agriculture, forestry, aquaculture, etc. Its development is closely related to crop yield increase, variety improvement and ecological protection.

[0003] In the field of seedling cultivation, there are four prominent problems to be solved urgently: 1. High cost: Traditional seedling raising has large investments in materials, labor, etc., driving up the overall cost and restricting the improvement of industrial benefits. 2. Long growth cycle: The development of seedlings takes a long time, affecting the output speed of seedlings and being unable to quickly respond to market demands. 3. Low efficiency: The operation process is cumbersome, making large - scale production difficult and resulting in limited seedling yields. 4. Poor environmental control: It is difficult to accurately regulate growth factors such as temperature, light, and nutrient supply. The growth environment of seedlings is unstable, and the development quality is uneven.

[0004] The present invention introduces an innovative multi - harmonic constant - temperature device for seedling development, which significantly shortens the seedling cultivation time and reduces costs; it can automatically adjust the temperature according to the needs of seedlings, providing a stable and suitable environment for seedling growth, effectively solving the dilemmas of traditional seedling raising, strongly promoting the rapid growth of seedlings, and improving efficiency. Summary of the Invention

[0005] In order to overcome the defects existing in the prior art, the present invention provides a multi - harmonic constant - temperature device for seedling development.

[0006] To solve the above - mentioned technical problems, the technical solutions adopted by the present invention are as follows:

[0007] A multi - harmonic constant - temperature device for seedling development includes a cultivation chamber, in which there are a multi - harmonic temperature control module, an infrared thermal imaging sensor, a root temperature sensor, an intelligent control system, an environmental coupling module, and a seedling tray;

[0008] The multi - harmonic temperature control module: It is composed of a PTC ceramic heating sheet, a semiconductor refrigeration sheet, and a Helmholtz resonance cavity, and realizes a uniform temperature field distribution by superimposing different - frequency heat waves;

[0009] The seedling tray is arranged at the bottom inside the cultivation chamber, the root temperature sensor is arranged on the seedling tray, and the infrared thermal imaging sensor is installed on the cultivation chamber directly above the seedling tray; the combined light source is distributed at the top of the cultivation chamber;

[0010] The intelligent control system: It is equipped with an STM32 main control chip and receives the feedback signals from the infrared thermal imaging sensor and the root temperature sensor in real time;

[0011] Environmental coupling module: It includes a photosynthetically active radiation (PAR) sensor and a substrate humidity sensor, and realizes multi-parameter collaborative regulation through a fuzzy PID algorithm.

[0012] To improve the temperature control effect, the number of the above-mentioned PTC ceramic heating sheets is 9 - 11, and the number of the semiconductor refrigeration sheets is 7 - 9; the PTC ceramic heating sheets and the semiconductor refrigeration sheets are arranged in an alternating pattern.

[0013] Further preferably, the distance between the above-mentioned PTC ceramic heating sheets and the semiconductor refrigeration sheets is 14 - 16 mm.

[0014] The rated power of the above-mentioned PTC ceramic heating sheet is 25 W / sheet.

[0015] The above-mentioned PTC ceramic heating sheets, semiconductor refrigeration sheets, Helmholtz resonance cavity, intelligent regulation system and environmental coupling module are all arranged on the side wall of the cultivation chamber.

[0016] The above-mentioned Helmholtz resonance cavity is made of stainless steel or copper material. Preferably, it is made of copper material.

[0017] The above-mentioned multi-harmonic constant temperature device for seedling development can generate a multi-harmonic temperature field: the main control chip outputs a PWM signal to drive the TC ceramic heating sheet and the semiconductor refrigeration sheet to generate a fundamental wave (0.5 Hz) and a third harmonic (1.5 Hz) thermal field, which forms a uniform multi-harmonic temperature field after being resonantly amplified by the Helmholtz cavity.

[0018] The above-mentioned multi-harmonic constant temperature device for seedling development can be adaptively adjusted: when the infrared sensor detects that the local temperature difference > 0.5 °C, it automatically adjusts the harmonic phase difference to achieve dynamic compensation.

[0019] The above-mentioned multi-harmonic constant temperature device for seedling development can identify the growth stage: the environmental coupling module analyzes the seedling morphology image based on a convolutional neural network (CNN) and automatically switches the preset temperature control curve.

[0020] To better promote the rapid growth of seedlings, the combined light source is formed by arranging red, blue and purple LEDs alternately, that is, arranged in the following order: red, blue, purple, red, blue, purple...

[0021] Technologies not mentioned in the present invention shall refer to the prior art.

[0022] The process of the present invention states that it has the following advantages compared with the existing process.

[0023] Precise temperature control: The temperature difference between the root zone and the canopy of the seedlings ≤ 0.3 °C, and the germination rate is increased to 98.5% (≤ 92% for traditional equipment).

[0024] Significant energy saving: The comprehensive energy efficiency ratio reaches 4.3, and it saves 57% energy compared with traditional resistance heating (COP ≈ 1.0).

[0025] Intelligent adaptation: It supports the automatic recognition and parameter matching of six types of crop seedlings such as tomatoes and cucumbers, reducing manual intervention by 80%.

[0026] Cost advantage: The modular design reduces the production cost to 65% of traditional equipment and the maintenance cost by 50%. Specific implementation mode

[0027] To better understand the present invention, the content of the present invention will be further clarified below in conjunction with embodiments, but the content of the present invention is not limited to the following embodiments.

[0028] Embodiment 1:

[0029] Multi-stage constant temperature cultivation of tomato seedlings

[0030] Cultivation chamber: Configure a multi-harmonic temperature control module, which is arranged in an alternating pattern with 10 pieces of 40×40mm PTC ceramic heating elements (rated power 25W / piece) and 8 pieces of 40×40mm thermoelectric cooler (TEC1-12705), with a spacing of 15mm. The Helmholtz resonance cavity is made of 304 stainless steel (inner diameter 120mm, neck length 35mm). The infrared thermal imaging sensor (FLIR A300, accuracy ±0.1°C) is vertically installed on the cultivation chamber 30cm above the seedling tray. A combined light source is set at the top of the cultivation chamber, and the combined light source is formed by arranging red, blue, and purple LEDs alternately, with a spacing of 50cm between adjacent LEDs in all directions; Intelligent control system: Equipped with an STM32 main control chip, which receives the feedback signals of the infrared thermal imaging sensor and the root temperature sensor in real time.

[0031] Implementation steps: Set the target temperature of the germination period to 22±0.3°C, and load the fundamental wave of 0.5Hz and the third harmonic of 1.5Hz; switch to 20±0.5°C during the growth period, and adjust the harmonic frequency to 0.8Hz + 1.2Hz; gradually cool down to 16±0.5°C during the hardening-off period, and adopt the harmonic combination of 1.0Hz + 2.0Hz.

[0032] Effect verification: The temperature difference between the root zone and the canopy of the seedlings ≤0.3°C, the germination rate is 98.5%, the daily average energy consumption is 0.86kWh, and the energy saving is 57% compared with traditional equipment.

[0033] Embodiment 2:

[0034] Coupled regulation of high temperature and high humidity for cucumber seedlings

[0035] Cultivation chamber: On the basis of Embodiment 1, upgrade the Helmholtz cavity to copper material (inner diameter 150mm), configure a three-stage thermoelectric cooling module (TEC1-12740), and integrate a substrate humidity sensor (accuracy ±2%RH) and a PAR sensor (range 0-2000μmol·m-2·s-1).

[0036] Implementation steps: During the germination stage, set the temperature to 28 ± 0.5 °C and the relative humidity to 85 ± 3% RH, and apply low-frequency harmonics of 0.3 Hz + 1.8 Hz; during the leaf expansion stage, adjust it to 25 ± 0.5 °C and 75 ± 2% RH, and switch to medium-frequency harmonics of 0.5 Hz + 1.5 Hz; when the photosynthetically active radiation >

[0037] 300 μmol·m-2·s-1, trigger dynamic cooling at 0.8 °C / min.

[0038] Effect verification: During the hardening-off stage, the survival rate under low-temperature stress increased to 91.3%, the root volume increased by 37.6%, and the energy consumption decreased by 43% compared with the conventional high-temperature seedling-raising system.

[0039] Example 3:

[0040] Multi-crop adaptive constant-temperature general mode

[0041] Cultivation chamber: On the basis of Example 2, expand the multi-spectral imaging module (wavelength 450 - 900 nm), deploy the ResNet-18 convolutional neural network model, and integrate the growth databases of 6 types of crops (such as tomatoes, cucumbers, peppers, etc.).

[0042] Implementation steps: After the seedlings are placed, the system extracts morphological characteristics such as cotyledon area and hypocotyl length within 24 hours; match the preset temperature control curve (error < 5%), and automatically generate a harmonic combination of 0.5 - 2.0 Hz; monitor the change of chlorophyll content in real time and dynamically adjust the temperature field phase difference (compensation accuracy ± 0.1 °C).

[0043] Effect verification: The crop recognition accuracy is 98.7%, the accuracy of judging the development stage is 93.4%, the model inference time is 0.23 s / frame, and the memory occupancy < 15 MB.

Claims

1. A multi-harmonic constant temperature device for seedling development, characterized in that: It includes a cultivation chamber, which is equipped with a multi-harmonic temperature control module, an infrared thermal imaging sensor, a root temperature sensor, a combined light source, an intelligent control system, an environmental coupling module and a seedling tray; Multi-harmonic temperature control module: It is composed of PTC ceramic heating plate, semiconductor cooling plate and Helmholtz resonance cavity, and achieves uniform temperature field distribution by superimposing heat waves of different frequencies; The seedling tray is located at the bottom of the cultivation chamber, the root temperature sensor is located on the seedling tray, and the infrared thermal imaging sensor is installed on the cultivation chamber directly above the seedling tray; the combined light source is distributed on the top of the cultivation chamber; Intelligent control system: equipped with STM32 main control chip, receiving feedback signals from infrared thermal imaging sensor and root temperature sensor in real time; Environmental coupling module: includes photosynthetically active radiation sensor and substrate humidity sensor, and realizes multi-parameter coordinated control through fuzzy PID algorithm.

2. The multi-harmonic constant temperature device for seedling development according to claim 1, characterized in that: The number of PTC ceramic heating sheets is 9 to 11, and the number of semiconductor cooling sheets is 7 to 9; the PTC ceramic heating sheets and the semiconductor cooling sheets are arranged alternately.

3. The multi-harmonic constant temperature device for seedling development according to claim 2, characterized in that: The distance between the PTC ceramic heating plate and the semiconductor cooling plate is 14 to 16 mm.

4. The multi-harmonic constant temperature device for seedling development according to claim 2, characterized in that: The rated power of the PTC ceramic heater is 25W / piece.

5. The multi-harmonic constant temperature device for seedling development according to any one of claims 1 to 4, characterized in that: PTC ceramic heating plate, semiconductor cooling plate, Helmholtz resonance cavity, intelligent control system and environmental coupling module are all installed on the side wall of the cultivation chamber.

6. The multi-harmonic constant temperature device for seedling development according to any one of claims 1 to 4, characterized in that: The Helmholtz resonator is made of stainless steel or copper.

7. The multi-harmonic constant temperature device for seedling development according to any one of claims 1 to 4, characterized in that: The main control chip outputs PWM signals to drive the TC ceramic heater and semiconductor cooling plate to generate fundamental and third harmonic thermal fields, which are then amplified by the Helmholtz cavity resonance to form a uniform multi-harmonic temperature field.

8. The multi-harmonic constant temperature device for seedling development according to any one of claims 1 to 4, characterized in that: When the infrared sensor detects that the local temperature difference is greater than 0.5°C, the harmonic phase difference is automatically adjusted to achieve dynamic compensation.

9. The multi-harmonic constant temperature device for seedling development according to any one of claims 1 to 4, characterized in that: The environmental coupling module analyzes the seedling morphological image based on the convolutional neural network and automatically switches to the preset temperature control curve.

10. The multi-harmonic constant temperature device for seedling development according to any one of claims 1 to 4, characterized in that: The combined light source is formed by alternating arrangement of red, blue and purple LEDs.