Culture hole and seedling hole tray for on-line monitoring of moisture content and temperature of culture medium

Abstract

The utility model discloses a culture hole and seedling hole tray for on-line monitoring of water content and temperature of a culture medium, and relates to the technical field of plant seedling beds, the culture hole and seedling hole tray comprises a seedling inner layer and a protective shell, the seedling inner layer is used for accommodating the seedling culture medium and is placed in the protective shell, and a gap is formed between the seedling inner layer and the protective shell; capacitive humidity sensors are arranged on the front side wall and the rear side wall of the seedling culture inner layer and are used for detecting the humidity change of a seedling culture medium in a hole tray; interdigital capacitors are arranged on the left side wall and the right side wall of the seedling culture inner layer respectively and used for detecting the water accumulation condition in the seedling culture inner layer; a temperature sensor is fixedly arranged between the seedling culture inner layer and the protective shell and is used for detecting the temperature of the seedling culture inner layer; the interdigital capacitor is arranged to detect the accumulated water in the hole tray, the detection result of the capacitive humidity sensor on the water content of the culture medium can be combined, misjudgment possibly caused by the accumulated water in the water content detection can be prompted, and the humidity detection accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plant nursery beds, in particular to a culture hole and a seedling hole tray for online monitoring of the moisture content and temperature of a culture medium. Background Art

[0002] In order to improve the efficiency and quality of plant seedlings, modern agriculture usually adopts a simplified plug tray method on the steel frame seedbed in the greenhouse facility. The temperature and moisture content of the substrate in the plug tray are important parameters of plant growth environment and have a key impact on the effect of crop cultivation. Therefore, an important part of plant seedling cultivation is to monitor and control the temperature and humidity during the process.

[0003] At present, the monitoring of temperature and humidity in the process of seedling cultivation in hole trays is usually carried out using temperature sensors and humidity sensors. Common humidity sensors include impedance humidity sensors and capacitive humidity sensors. However, due to the small space of the seedling hole, the impedance humidity sensor lacks sufficient contact area and cannot measure, so it is not suitable for seedling hole tray cultivation. At present, there is no sensor suitable for direct online measurement of the moisture content of the seedling cultivation matrix that has been widely used.

[0004] The defects of existing detection methods are:

[0005] (1) Existing humidity sensors can only detect ambient humidity, and there is no device for measuring the moisture content of the matrix in the plug tray;

[0006] (2) Only humidity detection is performed. When water accumulates in the plug tray due to excessive watering, the humidity detection will be abnormal, which may easily lead to misjudgment of the moisture content in the culture medium. Utility Model Content

[0007] In view of the deficiencies in the above-mentioned prior art, the utility model provides a culture hole and seedling hole tray for online monitoring of the moisture content and temperature of the culture medium, which directly detects the moisture content of the culture medium in the hole tray, avoiding the misjudgment of the moisture content of the culture medium indirectly based on the ambient humidity. Moreover, water accumulation detection can be performed while detecting temperature and humidity, avoiding the influence of water accumulation on the detection result of the humidity of the culture medium, and electromagnetic shielding can be performed to improve the accuracy of online monitoring of the temperature and humidity of the seedling hole tray.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] In a first aspect, a culture hole for online monitoring of moisture content and temperature of a culture medium is provided, comprising a seedling inner layer and a protective outer shell, wherein the seedling inner layer is used to accommodate a seedling culture medium and is placed inside the protective outer shell, and a gap is provided between the seedling inner layer and the protective outer shell;

[0010] Capacitive humidity sensors are arranged on the front and rear side walls of the inner layer for detecting the humidity change of the seedling culture matrix in the hole tray; interdigital capacitors are arranged on the left and right side walls of the inner layer for detecting the water accumulation in the inner layer for seedlings; a temperature sensor is fixedly arranged between the inner layer for seedlings and the protective outer shell for detecting the temperature of the inner layer for seedlings.

[0011] Preferably, the temperature sensor is arranged below the capacitive humidity sensor and can compensate for the temperature of the capacitive humidity sensor.

[0012] Preferably, the inner layer of the protective shell is provided with a shielding layer for electromagnetic shielding to protect the detection signal of the inner layer of the seedling cultivation from external interference, thereby improving the accuracy and stability of temperature and humidity monitoring.

[0013] Preferably, the shielding layer is made of metal foil or metal mesh.

[0014] Preferably, positioning pins and pin holes are provided between the inner seedling raising layer and the protective outer shell, so as to tightly close the inner and outer layers to form a waterproof and enclosed space and constitute electromagnetic shielding.

[0015] Preferably, the interdigital capacitors are respectively arranged at the bottom and the top of the inner layer of the seedling culture, and can detect any water level height in the seedling plug tray.

[0016] Preferably, the protective housing is grounded via a wire to ensure reliable electromagnetic shielding and accurate measurement.

[0017] On the other hand, the present application also provides a seedling hole tray with online monitoring of moisture content and temperature of culture medium, which includes multiple culture holes, and the culture holes adopt any of the above-mentioned culture holes with online monitoring of moisture content and temperature of culture medium.

[0018] Preferably, it also includes a control mainboard and a display panel, wherein the control mainboard is arranged on one side of the seedling hole tray, and the capacitive humidity sensor, interdigital capacitor and temperature sensor in each culture hole are connected to the control mainboard, and the control mainboard is connected to the display panel.

[0019] Preferably, it also includes an electrode protection plate, which is arranged above the control main board and the display panel for waterproofing; the electrode protection plate is made of plastic material, which is economical and practical.

[0020] Preferably, spacer ribs are provided between adjacent culture holes, and the spacer ribs are fixed to the side panels to separate and reliably position the culture holes.

[0021] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0022] 1. The utility model reasonably designs a capacitive humidity sensor so that the sensor is applicable to various seedling plug tray specifications that are currently widely used. By placing an ordinary plug tray directly in the sensor, the moisture content of the culture medium in the seedling plug tray can be immediately read; it can also replace a disposable seedling plug tray to directly cultivate seedlings and provide real-time data on changes in the moisture content of the plug tray on the seedbed during the seedling cultivation process.

[0023] 2. The humidity sensor of the utility model can directly detect the change of the moisture content of the culture substrate in the plug tray without the need for indirect estimation through the ambient humidity.

[0024] 3. The utility model adds a cross-finger capacitor for water accumulation detection, which can be combined with the humidity detection result to prompt that the humidity detection may be misjudged due to water accumulation; at the same time, when the water accumulation reaches a certain height, it can prompt to stop watering to prevent the seedlings from being flooded; the ambient temperature is detected by the temperature sensor, and the temperature and humidity of the culture hole and the seedling hole tray are monitored online, thereby improving the monitoring accuracy.

[0025] 4. The culture hole of the utility model is set as an inner and outer double-layer structure, and the outer protective shell is provided with a shielding layer, which can perform electromagnetic shielding, reduce the external environment's interference with the temperature and humidity detection signal, and improve the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0027] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model.

[0029] In the figure: 1. Inner layer for seedling cultivation; 2. Protective outer shell; 3. Capacitive humidity sensor; 4. Interdigital capacitor; 5. Temperature sensor; 6. Shielding layer; 7. Control main board; 8. Display panel; 9. Electrode protection plate; 10. Spacer ribs. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0032] Embodiment 1

[0033] In a typical embodiment of the present application, a culture hole for online monitoring of the moisture content and temperature of the culture medium is provided, such as Figure 1 As shown, it includes a seedling inner layer 1 and a protective outer shell 2. The seedling inner layer is used to accommodate the seedling culture matrix and is placed inside the protective outer shell. There is a gap between the seedling inner layer 1 and the protective outer shell 2; the inner wall of the seedling inner layer 1 is provided with a capacitive humidity sensor 3, which includes a pair of parallel capacitor plates arranged on the front and rear side walls, which are used to detect the humidity change of the seedling culture matrix in the hole tray, that is, the change of water content; the left and right side walls of the seedling inner layer 1 are respectively provided with interdigital capacitors 4, which are used to detect the water accumulation in the seedling inner layer; a temperature sensor 5 is fixedly arranged between the seedling inner layer 1 and the protective outer shell 2, which is used to detect the ambient temperature of the seedling inner layer.

[0034] Specifically, the inner seedling layer and the protective outer shell have the same shape, and the bottom of the inner seedling layer 1 is placed in the protective outer shell 2 to form a double-layer structure. The inner seedling layer provides a direct growth environment for seedlings, and the temperature and humidity inside it need to be monitored in real time and adaptively adjusted to ensure that the parameters of the seedling environment are within an appropriate range.

[0035] For humidity detection, in this embodiment, a pair of parallel plate capacitors are provided in the front and rear side walls of the seedling inner layer. The capacitor medium is made of humidity-sensitive material, and the dielectric constant changes with humidity. Thus, the change in the humidity of the seedling environment in the seedling inner layer can be reflected by the change in capacitance value, thus forming a capacitive humidity sensor.

[0036] Considering that when water accumulates in the inner layer of the seedling due to excessive watering or other reasons, the main factor affecting the growth of the seedlings is the water accumulation rather than the humidity. At this time, the humidity detection value is of little significance and may lead to misjudgment of the production situation in the culture medium. Figure 1As shown, in this embodiment, the finger capacitors 4 are symmetrically arranged in the left and right side walls of the inner layer 1 of the seedling raising, and the finger capacitors are connected to the control main board wires to detect the water accumulation in the hole tray and upload it to the control main board. The finger capacitors 4 are arranged on the upper and lower sides respectively. When the finger capacitors on the lower side detect water accumulation, the control main board can be combined with the parallel plate capacitor detection results to prompt that the moisture content detection may be misjudged due to water accumulation, thereby improving the accuracy of the humidity detection results; when the upper and lower capacitors simultaneously detect the presence of water accumulation, it can be prompted to stop watering. The detection threshold of the finger capacitor to detect water accumulation can be determined through experiments in combination with planting habits or process requirements, and the alarm prompt function can be realized by downloading relevant parameters to the control main board.

[0037] For temperature detection, in this embodiment, the temperature sensor 5 is fixed on the outer wall of the inner layer of the seedling cultivation, and is located below the capacitive humidity sensor 3. It can not only monitor the temperature in the inner layer of the seedling cultivation, but also compensate for the temperature of the parallel plate capacitor by being arranged close to the capacitive humidity sensor, thereby reducing the error of humidity detection caused by the change in capacitance of the capacitive humidity sensor due to temperature change. Preferably, the temperature sensor adopts an NTC thermistor or a digital temperature sensor.

[0038] In addition, considering that there are many electrical devices in the general seedling environment, it is easy to be affected by electromagnetic interference caused by factors such as electromagnetic radiation and electrostatic field in the environment, which affects the temperature and humidity detection accuracy. In this embodiment, Figure 1 As shown, a shielding layer 6 is fixedly arranged on the inner wall of the protective shell 2 for electromagnetic shielding to protect the temperature and humidity detection signals of the inner layer of the seedling cultivation from external interference, thereby improving the accuracy and stability of temperature and humidity monitoring. Specifically, the shielding layer can be made of metal foil or metal mesh, which is closely attached to the inner wall of the protective shell.

[0039] In addition, in this embodiment, matching positioning pins and pin holes are provided between the seedling inner layer and the protective outer shell, which facilitates the installation and positioning of the seedling inner layer and the protective outer shell. At the same time, the inner and outer layers of the culture hole can be tightly fastened to form a waterproof space and ensure reliable electromagnetic shielding.

[0040] And, if Figure 1 As shown, the protective housing in this embodiment is grounded through a wire, which can ensure electromagnetic shielding and reliable detection.

[0041] Embodiment 2

[0042] In another typical embodiment of the utility model, a seedling plug tray with online monitoring of the moisture content and temperature of the culture medium is provided. Figure 2 As shown, a plurality of culture holes are arranged on the frame of the seedling hole tray, and the culture holes adopt the culture holes for online monitoring of the moisture content and temperature of the culture medium in the first embodiment.

[0043] like Figure 2As shown, the seedling plug tray also includes a control mainboard 7 and a display panel 8. The control mainboard 7 is arranged on one side of the frame where the culture hole is located. The capacitive humidity sensor, interdigital capacitor and temperature sensor of each culture hole are connected to the control mainboard, and the control mainboard 7 is connected to the display panel 8. The control mainboard 7 receives the sensor signals of humidity, temperature and water accumulation, and feeds back to the display panel 8 after processing, so as to realize the online monitoring of temperature and humidity in the seedling plug tray.

[0044] In order to protect the circuit, an electrode protection plate 9 is also included, which is arranged above the control main board and the display panel for waterproofing. Preferably, the electrode protection plate is made of plastic material, which is economical and practical.

[0045] In addition, in this embodiment, spacer ribs 10 are provided between adjacent culture holes. The spacer ribs 10 are fixed on the side panels and can separate and position a plurality of culture holes.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Those skilled in the art should understand that the utility model can be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A culture hole for online monitoring of moisture content and temperature of culture medium, characterized in that: It comprises a seedling raising inner layer and a protective outer shell, wherein the seedling raising inner layer is used to contain a seedling culture matrix and is placed inside the protective outer shell, and there is a gap between the seedling raising inner layer and the protective outer shell; Capacitive humidity sensors are arranged on the front and rear side walls of the inner seedling layer, and interdigital capacitors are arranged on the left and right side walls of the inner seedling layer respectively; a temperature sensor is fixedly arranged between the inner seedling layer and the protective shell to detect the temperature of the inner seedling layer.

2. A culture hole for online monitoring of moisture content and temperature of culture medium as claimed in claim 1, characterized in that: The inner layer of the protective shell is provided with a shielding layer.

3. A culture hole for online monitoring of moisture content and temperature of culture medium as claimed in claim 2, characterized in that: The shielding layer is made of metal foil or metal mesh.

4. A culture hole for online monitoring of moisture content and temperature of culture medium as claimed in claim 1, characterized in that: Positioning pins and pin holes are arranged between the seedling raising inner layer and the protective outer shell.

5. A culture hole for online monitoring of moisture content and temperature of culture medium as claimed in claim 1, characterized in that: The interdigital capacitors are respectively arranged at the bottom and the top of the inner layer of the seedling cultivation.

6. A culture hole for online monitoring of moisture content and temperature of culture medium as claimed in claim 1, characterized in that: The protective shell is grounded through a wire.

7. A seedling plug tray for online monitoring of moisture content and temperature of culture medium, comprising a plurality of culture holes, characterized in that: The culture hole adopts the culture hole with online temperature monitoring as described in any one of claims 1-6.

8. A seedling plug tray for online monitoring of moisture content and temperature of culture medium as claimed in claim 7, characterized in that: The capacitive humidity sensor, interdigital capacitor and temperature sensor in the culture hole are all connected to the control mainboard, and the control mainboard is connected to the display panel.

9. A seedling plug tray for online monitoring of moisture content and temperature of culture medium as claimed in claim 7, characterized in that: It also includes an electrode protection plate, which is arranged above the control main board and the display panel; the electrode protection plate is made of plastic.

10. A seedling plug tray for online monitoring of moisture content and temperature of culture medium as claimed in claim 7, characterized in that: Spacer ribs are arranged between adjacent culture holes, and the spacer ribs are fixed on the side panels.

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