Intelligent livestock and poultry breathing heat measuring device and measuring result accuracy testing method thereof

Abstract

The invention relates to the technical field of respiration measuring devices, and discloses an intelligent livestock and poultry respiration heat measuring device and a measuring result accuracy testing method thereof.The intelligent livestock and poultry respiration heat measuring device comprises a metabolism cabin, a sampling port, a gas analyzer, a data acquisition controller, heating equipment, refrigeration equipment, a circulating fan, a flow meter, an exhaust pump, an air inlet and a temperature sensor; the air inlet end and the temperature sensor are arranged on the metabolism cabin, and the air inlet end is used for introducing outdoor air; the sampling port is formed in the metabolism cabin and is used for extracting mixed gas in the cabin; the circulating fan, the heating equipment and the refrigeration equipment are all arranged in the metabolism cabin, and the circulating fan is used for uniformly mixing gas in the cabin. Adaptive structures are respectively designed for cattle and poultry livestock and poultry, no fan is arranged outside the air inlet, and the caliber of the air inlet is larger than that of a pipeline connected with the exhaust pump, so that a micro-negative pressure environment is formed, the opening frequency of the cabin body and gas leakage are reduced, and the cabin body leakproofness during testing of different livestock and poultry types is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of respiratory measurement devices, in particular to an intelligent livestock and poultry respiratory calorimetry device and a measurement result accuracy testing method thereof. BACKGROUND

[0002] Livestock and poultry respiratory calorimetry is a core means for studying the energy metabolism law of livestock and poultry. By detecting key gas parameters such as oxygen consumption and carbon dioxide production during the respiratory process of livestock and poultry, the energy metabolism level of livestock and poultry can be directly reflected, providing accurate data support for optimizing feed formulations, developing scientific breeding programs, and evaluating the growth performance and health status of livestock and poultry. It has irreplaceable application value in the research of animal science and modern breeding production, so the demand for the accuracy of livestock and poultry respiratory calorimetry is increasingly urgent.

[0003] Currently, the industry mainly relies on introducing air into the metabolic chamber, and after the air is mixed with the exhaled gas of livestock and poultry, the mixed gas is extracted by a sampling assembly, the gas component change is detected by a gas analysis instrument, and then the metabolic parameters are obtained by recording and analyzing the data collected by a data acquisition device. However, in use, the metabolic chamber is usually of a unified general structure, which is not adapted to the body size difference and activity characteristics of cattle and poultry, and the door body of the chamber lacks effective sealing design, and the specifications of the air inlet passage and the air outlet passage are not reasonably matched, which leads to gas leakage in the chamber during the test, destroys the stability of the gas environment in the chamber, and further affects the accuracy of the respiratory calorimetry data. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides an intelligent livestock and poultry respiratory calorimetry device and a measurement result accuracy testing method thereof, which solves the problem of gas leakage in the chamber during the test, which destroys the stability of the gas environment in the chamber, and further affects the accuracy of the respiratory calorimetry data.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: an intelligent livestock and poultry respiratory calorimetry device, comprising a metabolic chamber, a sampling port, a gas analysis instrument, a data acquisition control instrument, a heating device, a refrigeration device, a circulating fan, a flow meter, an exhaust pump, an air inlet end, and a temperature sensor, wherein the air inlet and the temperature sensor are arranged on the metabolic chamber, and the air inlet is used to introduce outdoor air;

[0006] The sampling port is arranged on the metabolic chamber and is used to extract the mixed gas in the chamber;

[0007] The circulating fan, the heating device, and the refrigeration device are all arranged inside the metabolic chamber, the circulating fan is used to mix the gas in the chamber, and the heating device and the refrigeration device are used to cooperatively control the temperature in the chamber;

[0008] The exhaust pump is connected to the metabolic chamber through a pipeline, and the flow meter is connected to the pipeline to monitor the exhaust flow.

[0009] The gas analyzer and data acquisition and control unit are located outside the metabolic chamber. The gas analyzer's inlet pipe is located on the inner wall of the sampling port. The data acquisition and control unit is electrically connected to the gas analyzer, temperature sensor, flow meter, circulating fan, heating equipment, refrigeration equipment, and exhaust pump.

[0010] Preferably, the metabolic chamber is provided with cattle entry doors and feeding doors on both sides, and the interior of the metabolic chamber is provided with a waterer, a feed trough and LED lights;

[0011] The cattle entry gate is used for cattle and poultry to enter and exit the metabolic chamber, and the feeding gate is located above the feed trough and is used to supplement feed when the cattle entry gate is not opened.

[0012] The waterer and feed trough are located inside the metabolic chamber near the cattle entrance and are used to provide drinking water and feed for cattle and poultry, respectively.

[0013] Preferably, the interior of the metabolic chamber is equipped with a metabolic cage, a second water drinker, a feed trough, and a fluorescent light installed on the top of the metabolic chamber;

[0014] The metabolic cage is located in the middle of the metabolic chamber and is used to restrict the activity range of poultry and other livestock.

[0015] The second waterer and the feed trough are located inside the metabolic chamber and are used to provide drinking water and feed for poultry, respectively.

[0016] The fluorescent lamp is located on the top of the metabolic chamber and is used to provide light for poultry and other livestock.

[0017] Preferably, the inner diameter of the sampling port is ,pass A high-pressure polyethylene pipe is connected to the gas analyzer;

[0018] The gas analyzer has a detection resolution of 0.0001% for O2 and CO2, and a drift of no more than 0.001% / hr.

[0019] The data acquisition and control instrument has 64 channels of 4-20mA signal acquisition, 16-bit AD conversion accuracy, 0.05%FS accuracy, can continuously acquire data for more than 7 days, and has data display, curve plotting, table generation and data export functions.

[0020] Preferably, sealing strips are provided on the edges of the cattle entry door and the feeding door to ensure the airtightness of the metabolic chamber;

[0021] The LED lights illuminate the activity area of ​​the cattle and poultry inside the metabolic chamber.

[0022] Preferably, the air inlet is outside the fan and the air inlet diameter is greater than 3-4 times the diameter of the pipeline connected with the exhaust pump.

[0023] Preferably, the measurement accuracy test method of the intelligent livestock and poultry respiratory calorimetry device comprises the following steps:

[0024] S1: placing livestock or poultry animals in the inside of the metabolic chamber, checking all the instruments and connecting the instruments;

[0025] S2: stability calibration of the gas analyzer;

[0026] S3: using ethanol combustion experiment or chamber performance experiment to test the measurement accuracy of the device on oxygen consumption, carbon dioxide production, and methane production;

[0027] S4: collecting and analyzing data by the data acquisition controller to verify the accuracy of the measurement results of the device;

[0028] Among them, the instrument connection is to connect A micro-pump is installed on the air inlet end of the high-pressure polyethylene pipe, and the air outlet end of the micro-pump is connected with the air inlet end of the multi-channel gas path converter, and the air outlet end of the multi-channel gas path converter is connected with the gas analyzer.

[0029] Preferably, in the S2 step, the stability calibration method of the gas analyzer is: after turning on the gas analyzer for one hour, calibrating the sensor with standard gas, and then continuously measuring outdoor air for 180-200 hours, if the baseline does not drift obviously, it is qualified, and the standard gas includes CO2, O2, CH4.

[0030] Preferably, the ethanol combustion experiment in the S3 step comprises: burning anhydrous ethanol in the metabolic chamber, measuring the O2 consumption and CO2 production in the combustion process by the gas analyzer, calculating the respiratory entropy, and comparing with the theoretical value to verify the measurement accuracy;

[0031] Among them, the flow rate in the metabolic chamber is controlled at 100-300 L / min, the temperature is 25±0.5℃, the humidity is 50±3%, the gas detection resolution O2 / CO2 is 0.0001%, and the drift is <0.001% / hr.

[0032] Preferably, the chamber performance experiment in the S3 step comprises: injecting CO2 into the metabolic chamber, monitoring the CO2 concentration change in the chamber by the gas analyzer and the data acquisition controller, calculating the gas recovery rate and the equilibrium value, and verifying the chamber airtightness and gas detection accuracy;

[0033] Among them, the gas recovery rate should be between 96%-104%, and the error of the multi-chamber parallel value is ≤0.04%.

[0034] This invention provides an intelligent livestock and poultry respiratory calorimetry device and a method for testing the accuracy of its measurement results. It has the following beneficial effects:

[0035] 1. This invention designs adaptive structures for cattle and poultry respectively. The metabolic chamber for cattle is equipped with a cattle entrance and a feeding door, and the edges of the doors are equipped with sealing strips. The metabolic chamber for poultry is equipped with a metabolic cage inside. At the same time, the air inlet has no external fan and its diameter is larger than the diameter of the pipeline connected to the exhaust pump, forming a micro-negative pressure environment, reducing the number of times the chamber is opened and gas leakage, and improving the chamber airtightness during testing of different types of livestock and poultry.

[0036] 2. The sampling port of this invention is connected to a gas analyzer through a high-pressure polyethylene pipe. The gas analyzer has high detection resolution and low drift characteristics, and the data acquisition and control instrument has high-precision AD conversion capability, which reduces concentration distortion during gas transportation and improves the accuracy and data continuity of related gas concentration detection.

[0037] 3. This invention eliminates the effects of initial sensor error and long-term drift by employing a process of calibrating the gas analyzer with multi-component standard gas after preheating, and then verifying the baseline stability through long-term outdoor air testing, thus ensuring the instrument's detection stability.

[0038] 4. This invention verifies the accuracy from two dimensions: gas detection principle and cabin environment. It combines ethanol combustion experiments with theoretical respiratory entropy comparison, and cabin performance experiments with gas recovery rate and multi-cabin parallel value error verification. This improves the reliability of the device's measurement results. Attached Figure Description

[0039] Figure 1 This is a plan view of the metabolic chamber of the intelligent livestock and poultry respiratory pyrography device of the present invention;

[0040] Figure 2 This is a plan view of the gas analyzer in the intelligent livestock and poultry respiratory calorimetry device of the present invention;

[0041] Figure 3 This is a flowchart of a method for testing the accuracy of measurement results from the intelligent livestock and poultry respiratory thermometry device of the present invention.

[0042] The components include: 1. Metabolic chamber; 2. Sampling port; 3. Gas analyzer; 4. Data acquisition and control instrument; 5. Heating equipment; 6. Refrigeration equipment; 7. Circulating fan; 8. Flow meter; 9. Exhaust pump; 10. Air inlet; 11. Temperature sensor; 12. Cattle entrance gate; 13. Feeding gate; 14. Waterer 1; 15. Feed trough 1; 16. LED light; 17. Metabolic cage; 18. Waterer 2; 19. Feed trough; 20. Fluorescent lamp. Detailed Implementation

[0043] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Please see the appendix Figure 1 - Appendix Figure 2 The present invention provides an intelligent livestock and poultry respiratory pyrography device, including a metabolic chamber 1, a sampling port 2, a gas analyzer 3, a data acquisition and control instrument 4, a heating device 5, a cooling device 6, a circulating fan 7, a flow meter 8, an exhaust pump 9, an air inlet 10, and a temperature sensor 11. The air inlet 10 and the temperature sensor 11 are disposed on the metabolic chamber 1, and the air inlet 10 is used to introduce outdoor air.

[0045] Sampling port 2 is located on metabolic chamber 1 and is used to extract the mixed gas inside the chamber;

[0046] The circulating fan 7, heating equipment 5, and cooling equipment 6 are all installed inside the metabolic chamber 1. The circulating fan 7 is used to mix the gas in the chamber, and the heating equipment 5 and cooling equipment 6 work together to regulate the temperature in the chamber.

[0047] The exhaust pump 9 is connected to the metabolic chamber 1 via a pipe, and the flow meter 8 is connected to the pipe to monitor the exhaust flow rate.

[0048] Gas analyzer 3 and data acquisition and control unit 4 are located outside the metabolic chamber 1. The gas inlet pipe of gas analyzer 3 is located on the inner wall of sampling port 2. Data acquisition and control unit 4 is electrically connected to gas analyzer 3, temperature sensor 11, flow meter 8, circulating fan 7, heating equipment 5, refrigeration equipment 6 and exhaust pump 9 respectively.

[0049] Specifically, the metabolic chamber 1 provides a closed space for the respiratory metabolism of livestock and poultry. Outdoor air is introduced into the metabolic chamber 1 through the air inlet 10. The exhaust pump 9 is connected to the metabolic chamber 1 through a pipe and can exhaust the gas in the metabolic chamber 1 to the outside during operation. The flow meter 8 monitors the exhaust flow rate in real time during the exhaust process of the exhaust pump 9. The temperature sensor 11 monitors the temperature data in the metabolic chamber 1 in real time. When the temperature sensor 11 detects that the temperature in the chamber deviates from the preset range, the heating equipment 5 or the cooling equipment 6 is activated to raise or lower the temperature to maintain the temperature stability in the metabolic chamber 1. The circulating fan 7 runs continuously during the gas circulation and temperature control process, mixing the outdoor air and the exhaled gas of the livestock and poultry in the metabolic chamber 1 to avoid uneven local gas concentration. The sampling port 2 draws the mixed gas in the chamber, and the gas analyzer 3 receives the mixed gas drawn from the sampling port 2 and detects the gas composition. The data acquisition and control instrument 4 collects the detection data of the gas analyzer 3, the temperature data of the temperature sensor 11, and the flow data of the flow meter 8 in real time. It can also send control signals to the circulating fan 7, heating equipment 5, cooling equipment 6, and exhaust pump 9 based on the collected data to ensure the coordinated operation of each device.

[0050] Please see the appendix Figure 1 - Appendix Figure 2 The metabolic chamber 1 is equipped with cattle entry gate 12 and feeding gate 13 on both sides. The interior of the metabolic chamber 1 is equipped with a waterer 14, a feed trough 15 and an LED light 16.

[0051] The cattle entrance 12 is used for cattle and poultry to enter and exit the metabolic chamber 1, and the feeding door 13 is located above the feed trough 15 and is used to supplement feed when the cattle entrance 12 is not opened.

[0052] Waterer 14 and feed trough 15 are installed inside metabolic chamber 1 and are used to provide drinking water and feed for cattle and poultry, respectively.

[0053] LED lights 16 are installed on the top inside the metabolic chamber 1 to provide illumination for cattle and poultry.

[0054] Specifically, the metabolic chamber 1 provides a sealed space for the respiratory metabolism of cattle and poultry. The cattle entrance 12 allows cattle and poultry to enter and exit the metabolic chamber 1. The feeding door 13 is located above the feed trough 15, allowing feed to be added to the feed trough 15 without opening the cattle entrance 12, thus reducing the number of times the metabolic chamber 1 is opened and reducing gas leakage inside the chamber. Inside the metabolic chamber 1, near the cattle entrance 12, a waterer 14 and a feed trough 15 are installed to provide drinking water and feed for cattle and poultry, respectively. An LED light 16 installed on the top inside provides illumination for cattle and poultry, meeting their basic survival needs during the respiratory metabolism test inside the chamber.

[0055] Please see the appendix Figure 1 - Appendix Figure 2The interior of the metabolic chamber 1 is equipped with a metabolic cage 17, a water drinker 18, a feed trough 19, and a fluorescent lamp 20 installed on the top of the metabolic chamber 1.

[0056] The metabolic cage 17 is located in the middle of the metabolic chamber 1 and is used to restrict the activity range of poultry.

[0057] Waterer 18 and feed trough 19 are located inside the metabolic chamber 1 near the metabolic cage 17, and are used to provide drinking water and feed for poultry, respectively.

[0058] Fluorescent lamps 20 are installed on the top of the metabolic chamber 1 to provide light for poultry and livestock.

[0059] Specifically, for poultry and livestock, the metabolic cage 17 set in the middle of the metabolic chamber 1 can restrict the activity range of poultry and livestock. The waterer 18 and feed trough 19 set in the internal metabolic cage 17 provide drinking water and feed for poultry and livestock, respectively. The fluorescent lamp 20 set on the top of the metabolic chamber 1 provides light for poultry and livestock, meeting the basic survival needs during the respiratory metabolism test in the metabolic chamber 1.

[0060] Please see the appendix Figure 1 - Appendix Figure 2 The inner diameter of sampling port 2 is ,pass The high-pressure polyethylene pipe is connected to the gas analyzer 3;

[0061] The gas analyzer 3 has a detection resolution of 0.0001% for O2 and CO2, with a drift of no more than 0.001% / hr;

[0062] The data acquisition and control unit 4 has 64 channels of 4-20mA signal acquisition, 16-bit AD conversion accuracy, 0.05%FS accuracy, can continuously acquire data for more than 7 days, and has data display, curve plotting, table generation and data export functions.

[0063] Specifically, the inner diameter of sampling port 2 is ,pass A high-pressure polyethylene pipe is connected to the gas analyzer 3, ensuring that the mixed gas extracted from the metabolic chamber 1 by the sampling port 2 maintains a stable concentration during transportation, avoiding gas stagnation or abnormal concentration changes due to mismatched pipe specifications. After receiving the mixed gas transported from the sampling port 2 through the designated pipe, the gas analyzer 3 can capture minute changes in the concentration of O2 and CO2 in the gas, and control the data drift within a limited range during long-term detection, ensuring the accuracy and stability of the O2 and CO2 concentration detection results. The data acquisition and control unit 4 receives the O2 and CO2 concentration detection signals output by the gas analyzer 3, accurately converts the received analog signals into digital signals, and continuously collects data for more than 7 days, meeting the long-term data acquisition requirements for livestock and poultry respiratory metabolism testing. It can also provide intuitive presentation and subsequent processing of the collected detection data, realizing a coherent process from mixed gas sampling, O2 and CO2 concentration detection to data acquisition and processing, ensuring the accuracy, stability, and usability of the livestock and poultry respiratory metabolism-related data acquired by the device.

[0064] Please see the appendix Figure 1 - Appendix Figure 2 Sealing strips are installed on the edges of the cattle entry gate 12 and the feeding gate 13 to ensure the airtightness of the metabolic chamber 1.

[0065] Specifically, if there are gaps between the cattle entry door 12 and the edge of the metabolic chamber 1, it may lead to leakage of the mixed gas inside the metabolic chamber 1, or outside air may enter the chamber directly without passing through the air inlet 10, thus disrupting the stability of the gas environment inside the chamber. Sealing strips are installed on the edges of the cattle entry door 12 and the feeding door 13 to fill the gaps between the door and the chamber, blocking the leakage path of the mixed gas inside the chamber and the unexpected entry channel of outside air, thereby ensuring the airtightness of the metabolic chamber 1. This allows the concentration of the mixed gas inside the metabolic chamber 1 to truly reflect the gas changes during the respiratory metabolism of cattle and poultry, and ensures that the concentration of the mixed gas extracted by the sampling port 2 matches the actual metabolic situation, thereby ensuring the accuracy of the detection data of O2 and CO2 concentration by the gas analyzer 3.

[0066] Please see the appendix Figure 1 - Appendix Figure 2 There is no external fan at the air inlet 10, and the diameter of the air inlet 10 is 3-4 times larger than the diameter of the pipe connected to the exhaust pump 9.

[0067] Specifically, there is no external fan at the air inlet 10, and the air intake method is passive air intake. At the same time, the diameter of the air inlet 10 is 3-4 times larger than the diameter of the pipe connected to the exhaust pump 9. This allows the exhaust pump 9 to draw mixed gas from the metabolic chamber 1 and discharge it to the outside through the connecting pipe during operation. Since the diameter of the connecting pipe of the exhaust pump 9 is small, the exhaust volume per unit time is relatively stable. However, because the air inlet 10 has a larger diameter and no active air supply device, the passive air intake volume per unit time is less than the exhaust volume of the exhaust pump 9. This creates a slightly negative pressure environment in the metabolic chamber 1. Combined with the sealing strips on the edges of the cattle inlet door 12 and the feeding door 13 to ensure the airtightness of the metabolic chamber 1, the slightly negative pressure environment can prevent the mixed gas in the metabolic chamber 1 from leaking from the gaps in the chamber.

[0068] Please see the appendix Figure 1 - Appendix Figure 2 The method for testing the accuracy of measurement results from intelligent livestock and poultry respiratory thermometry devices includes the following steps:

[0069] S1: Place livestock or poultry inside metabolic chamber 1, check all equipment and connect the equipment;

[0070] S2: Perform stability calibration on gas analyzer 3;

[0071] S3: Using ethanol combustion experiments or cabin performance experiments, test the accuracy of the device in measuring oxygen consumption, carbon dioxide production, and methane production.

[0072] S4: Collect and analyze data through the data acquisition and control instrument 4 to verify the accuracy of the device's measurement results;

[0073] Among them, the tool connection is to A miniature air pump is installed on the inlet end of a high-pressure polyethylene pipe, and the outlet end of the miniature air pump is connected to the inlet end of a multi-channel gas converter. The outlet end of the multi-channel gas converter is connected to a gas analyzer.

[0074] Specifically, after livestock or poultry are placed inside the metabolic chamber 1 in S1, A micro air pump is installed at the air inlet end of the high-pressure polyethylene pipe. The air outlet end of the micro air pump is connected to the air inlet end of the multi-channel gas converter. The air outlet end of the multi-channel gas converter is connected to the gas analyzer 3, so that the mixed gas in the metabolic chamber 1 is stably extracted and detected by the gas analyzer 3.

[0075] In S2, the stability calibration of gas analyzer 3 can eliminate the initial error of gas analyzer 3 itself, so that gas analyzer 3 is in a stable working state that meets the detection requirements, and avoids deviation of O2, CO2 and methane concentration detection data due to instrument instability.

[0076] S3 uses ethanol combustion experiments or cabin performance experiments to test the accuracy of measuring oxygen consumption, carbon dioxide production, and methane production. The ethanol combustion experiment can be compared with the device's detection value by comparing the theoretical gas change of the known combustion reaction. The cabin performance experiment can be compared with the device's detection value by comparing the gas concentration change of the known injection amount. This directly verifies the accuracy of the device's detection of the target gas.

[0077] Step S4 involves acquiring and analyzing data through the data acquisition and control instrument 4. The data acquisition and control instrument 4 receives and processes the detection data output by the gas analyzer 3. Through data processing and analysis, it determines whether the measurement results of the device meet the accuracy requirements, ensuring that the livestock and poultry respiratory metabolism-related data obtained by the intelligent livestock and poultry respiratory calorimetry device in actual use are accurate and reliable.

[0078] In step S2, the stability calibration method for gas analyzer 3 is as follows: after turning on gas analyzer 3 for one hour, calibrate the sensor with standard gas, and then continuously measure outdoor air for 180-200 hours. If there is no obvious baseline drift, the calibration is qualified. The standard gas includes CO2, O2, and CH4.

[0079] Specifically, after turning on the gas analyzer 3 for one hour, use a standard gas containing CO2, O2, and CH4 to calibrate the sensor and eliminate the initial error of the sensor. Then, continuously measure outdoor air for 180-200 hours. If there is no obvious baseline drift, it indicates that the gas analyzer 3 has met the requirements for data stability during long-term operation, avoiding deviations in O2, CO2, and methane concentration detection data due to insufficient instrument stability.

[0080] The ethanol combustion experiment in step S3 includes: burning anhydrous ethanol in metabolic chamber 1, measuring the amount of O2 consumed and CO2 produced during the combustion process using gas analyzer 3, calculating the respiratory entropy, and comparing it with the theoretical value to verify the accuracy of the measurement.

[0081] The flow rate in metabolic chamber 1 is controlled at 100-300 L / min, the temperature at 25±0.5℃, the humidity at 50±3%, the gas detection resolution of O2 / CO2 is 0.0001%, and the drift is <0.001% / hr.

[0082] Specifically, by burning anhydrous ethanol in the metabolic chamber 1, the characteristic that the combustion reaction of anhydrous ethanol has a definite theoretical value for O2 consumption and CO2 production provides a comparable benchmark for verifying the measurement accuracy of the device. The O2 consumption and CO2 production during the combustion process are measured by the gas analyzer 3, and the respiratory entropy is calculated and compared with the theoretical value. This allows for a direct determination of whether the device's measurement results for O2 consumption and CO2 production meet the accuracy requirements.

[0083] The chamber performance experiment in step S3 includes: injecting CO2 into metabolic chamber 1, monitoring the CO2 concentration change in the chamber through gas analyzer 3 and data acquisition and control instrument 4, calculating the gas recovery rate and balance value, and verifying the chamber airtightness and gas detection accuracy.

[0084] Among them, the gas recovery rate should be between 96% and 104%, and the parallel value error of multi-compartment should be ≤0.04%.

[0085] Specifically, a known amount of CO2 is injected into the metabolic chamber 1, and this known injection amount is used as the benchmark for gas concentration changes. The gas analyzer 3 detects the CO2 concentration inside the chamber, and the data acquisition and control instrument 4 monitors the dynamic changes in CO2 concentration. Based on the detected concentration change data, the gas recovery rate and balance value are calculated. If the recovery rate meets the range, it indicates that there is no significant leakage of CO2 injected into the metabolic chamber 1, which verifies the airtightness of the metabolic chamber 1. The parallel error of the multi-chamber values ​​must be ≤0.04%. If the error meets this requirement, the gas detection accuracy of the gas analyzer 3 and the data acquisition and control instrument 4 working together can be verified. Through the dual verification of chamber airtightness and gas detection accuracy, it is ensured that when detecting gases such as CO2 produced by livestock and poultry respiration and metabolism, the gas environment inside the chamber is stable and the detection data is not affected by leakage or insufficient instrument accuracy.

[0086] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An intelligent livestock and poultry respiratory pyrography device, comprising a metabolic chamber (1), a sampling port (2), a gas analyzer (3), a data acquisition and control instrument (4), a heating device (5), a cooling device (6), a circulating fan (7), a flow meter (8), an exhaust pump (9), an air inlet (10), and a temperature sensor (11), characterized in that, The air inlet (10) and temperature sensor (11) are disposed on the metabolic chamber (1), and the air inlet (10) is used to introduce outdoor air; The sampling port (2) is located on the metabolic chamber (1) and is used to extract the mixed gas inside the chamber; The circulating fan (7), heating device (5), and cooling device (6) are all installed inside the metabolic chamber (1). The circulating fan (7) is used to mix the gas in the chamber, and the heating device (5) and cooling device (6) work together to regulate the temperature in the chamber. The exhaust pump (9) is connected to the metabolic chamber (1) through a pipe, and the flow meter (8) is connected to the pipe to monitor the exhaust flow rate; The gas analyzer (3) and the data acquisition controller (4) are located outside the metabolic chamber (1). The gas inlet pipe of the gas analyzer (3) is located on the inner wall of the sampling port (2). The data acquisition controller (4) is electrically connected to the gas analyzer (3), temperature sensor (11), flow meter (8), circulating fan (7), heating equipment (5), refrigeration equipment (6) and exhaust pump (9).

2. The intelligent livestock and poultry respiratory pyrography device according to claim 1, characterized in that, The metabolic chamber (1) is provided with cattle entry door (12) and feeding door (13) on both sides. The interior of the metabolic chamber (1) is provided with a waterer (14), a feed trough (15) and an LED light (16). The cattle entry door (12) is used for cattle to enter and exit the metabolic chamber (1), and the feeding door (13) is located above the feed trough (15) and is used to supplement feed when the cattle entry door (12) is not opened. The waterer (14) and feed trough (15) are located inside the metabolic chamber (1) near the cattle entrance (12) and are used to provide drinking water and feed for cattle and poultry, respectively. The LED light (16) is located on the top inside the metabolic chamber (1) and is used to provide light for cattle and poultry.

3. The intelligent livestock and poultry respiratory pyrography device according to claim 1, characterized in that, The metabolic chamber (1) is equipped with a metabolic cage (17), a second water drinker (18), a feed trough (19), and a fluorescent lamp (20) on the top of the metabolic chamber (1). The metabolic cage (17) is located in the middle of the metabolic chamber (1) and is used to restrict the activity range of poultry. The second waterer (18) and the feed trough (19) are located inside the metabolic chamber (1) and are used to provide drinking water and feed for poultry, respectively. The fluorescent lamp (20) is located on the top of the metabolic chamber (1) and is used to provide light for poultry and livestock.

4. The intelligent livestock and poultry respiratory pyrography device according to claim 1, characterized in that, The inner diameter of the sampling port (2) is pass A high-pressure polyethylene pipe is connected to the gas analyzer (3); The gas analyzer (3) has a detection resolution of 0.0001% for O2 and CO2, and a drift of no more than 0.001% / hr; The data acquisition controller (4) has 64 channels of 4-20mA signal acquisition, 16-bit AD conversion accuracy, 0.05%FS accuracy, can continuously acquire data for more than 7 days, and has data display, curve plotting, table generation and data export functions.

5. The intelligent livestock and poultry respiratory pyrography device according to claim 2, characterized in that, The edges of the cattle entry gate (12) and the feeding gate (13) are equipped with sealing strips to ensure the airtightness of the metabolic chamber (1).

6. The intelligent livestock and poultry respiratory pyrography device according to claim 1, characterized in that, The air inlet (10) has no external fan and the diameter of the air inlet (10) is 3-4 times larger than the diameter of the pipe connected to the exhaust pump (9).

7. A method for testing the accuracy of measurement results from an intelligent livestock and poultry respiratory calorimetry device, characterized in that, The intelligent livestock and poultry respiratory pyrography device according to any one of claims 1-6 comprises the following steps: S1: Place livestock or poultry inside the metabolic chamber (1), check all equipment and connect the equipment; S2: Perform stability calibration on the gas analyzer (3); S3: Using ethanol combustion experiments or cabin performance experiments, test the accuracy of the device in measuring oxygen consumption, carbon dioxide production, and methane production. S4: Collect and analyze data through the data acquisition controller (4) to verify the accuracy of the device's measurement results; The connection of the utensils is to A miniature air pump is installed on the inlet end of a high-pressure polyethylene pipe, and the outlet end of the miniature air pump is connected to the inlet end of a multi-channel gas converter, the outlet end of which is connected to a gas analyzer.

8. The method for testing the accuracy of measurement results of the intelligent livestock and poultry respiratory pyrography device according to claim 7, characterized in that, In step S2, the stability calibration method of the gas analyzer (3) is as follows: after turning on the gas analyzer (3) for one hour, calibrate the sensor with standard gas, and then continuously measure outdoor air for 180-200 hours. If the baseline does not drift significantly, the calibration is qualified. The standard gas includes CO2, O2, and CH4.

9. The method for testing the accuracy of measurement results of the intelligent livestock and poultry respiratory pyrography device according to claim 7, characterized in that, The ethanol combustion experiment in step S3 includes: burning anhydrous ethanol in the metabolic chamber (1), measuring the amount of O2 consumed and CO2 produced during the combustion process using a gas analyzer (3), calculating the respiratory entropy, and comparing it with the theoretical value to verify the accuracy of the measurement. The flow rate in the metabolic chamber (1) is controlled at 100-300 L / min, the temperature is 25±0.5℃, the humidity is 50±3%, the gas detection resolution O2 / CO2 is 0.0001%, and the drift is <0.001% / hr.

10. The method for testing the accuracy of the measurement results of the intelligent livestock and poultry respiratory pyrography device according to claim 7, characterized in that, The chamber performance experiment in step S3 includes: injecting CO2 into the metabolic chamber (1), monitoring the CO2 concentration change in the chamber through a gas analyzer (3) and a data acquisition and control instrument (4), calculating the gas recovery rate and balance value, and verifying the chamber's airtightness and gas detection accuracy. Among them, the gas recovery rate should be between 96% and 104%, and the parallel value error of multi-compartment should be ≤0.04%.

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