Sample preparation device for soil organic carbon detection

Abstract

The invention relates to the technical field of sample preparation devices, and discloses a sample preparation device for soil organic carbon detection, which comprises: a device body; a feeding assembly; a separation assembly; the drying cavity is located in the device body and located on the side, away from the feeding assembly, of the separating assembly, a feeding opening is formed in the top of the drying cavity, and a sensor set is further arranged in the drying cavity and located on the inner side wall and the inner bottom wall of the drying cavity; a heating device for drying the sample is also arranged in the drying cavity; and the control device is located on the outer side of the device body and connected with the feeding assembly, the separating assembly and the drying cavity, and the control device is used for controlling operation of the feeding assembly and the separating assembly. By monitoring the humidity and temperature in the drying cavity, the drying process can be accurately controlled, excessive drying or incomplete drying of a sample is avoided, and therefore the accuracy and repeatability of a detection result are improved.

Description

Technical Field

[0001] The invention relates to the technical field of sample preparation devices, and in particular to a sample preparation device for soil organic carbon detection. Background Art

[0002] At present, the sample preparation device used to detect soil organic carbon often encounters some problems during the drying process of soil samples. Specifically, these problems mainly manifest in two aspects: one is over-drying, and the other is incomplete drying. Over-drying may cause partial decomposition of organic carbon in the soil, resulting in low test results; while incomplete drying may result in failure to completely remove moisture from the soil, which will result in high test results. In either case, it will have a negative impact on the accuracy of the test results, and thus affect the accurate assessment of soil organic carbon.

[0003] Therefore, it is necessary to design a sample preparation device for soil organic carbon detection to solve the problems existing in current technology. Summary of the invention

[0004] In view of this, the present invention proposes a sample preparation device for soil organic carbon detection, aiming to solve the problems of over-drying and incomplete drying of soil samples during the drying process of soil samples in the sample preparation device for detecting soil organic carbon in the current technology, as well as to quickly pass the 2mm soil sieve.

[0005] The present invention proposes a sample preparation device for soil organic carbon detection, comprising:

[0006] device body;

[0007] A feed assembly, located on one side of the device body;

[0008] A separation component is located in the middle of the device body, and is used to crush and separate the sample;

[0009] A drying chamber is located inside the device body and on a side of the separation component away from the feeding component. A feeding port is provided at the top of the drying chamber. A sensor group is also provided in the drying chamber. The sensor group is located on the inner side wall and the inner bottom wall of the drying chamber. A heating device for drying the sample is also provided inside the drying chamber.

[0010] The control device is located outside the device body and is connected to the feeding assembly, the separation assembly and the drying chamber. The control device is used to control the operation of the feeding assembly and the separation assembly.

[0011] Furthermore, the feed assembly comprises:

[0012] A feed hopper, located at one side of the device body, and used for temporarily storing the sample;

[0013] A first screw conveyor is horizontally arranged at the bottom of the feed hopper, one end of the first screw conveyor is connected to the feed hopper, and the other end of the first screw conveyor extends to the top of the separation assembly, and the first screw conveyor is used to convey the sample from the feed hopper to the separation assembly;

[0014] The first motor is arranged on a side of the feed hopper away from the separation assembly. The output end of the first motor is connected to the first screw conveyor. The first motor is used to drive the first screw conveyor to move.

[0015] Furthermore, the separation component comprises:

[0016] A crushing chamber is located in the middle of the device body, a feed port is provided at the top of the crushing chamber, and the output end of the first screw conveyor extends into the feed port;

[0017] A crushing roller, located inside the crushing chamber;

[0018] A first screen is located at the bottom of the crushing roller, and the first screen is inclined, the high end of the first screen is located at a side away from the first screw conveyor, and a first separation port is provided at the low end of the first screen; wherein the aperture of the first screen is 2.1 mm;

[0019] A second screen is located at the bottom of the first screen, and the second screen is inclined, the high end of the second screen is located on the side close to the first screw conveyor, and a second separation port is provided at the low end of the second screen; wherein the aperture of the second screen is 1.9 mm;

[0020] The vibration motor is located at the bottom of the second screen.

[0021] Furthermore, the separation component also includes:

[0022] A collecting chamber, located at one side of the bottom of the crushing chamber;

[0023] A second screw conveyor is arranged at the bottom of the crushing chamber, one end of the second screw conveyor extends to the top of the collecting chamber, and the other end is connected to the crushing chamber;

[0024] The second motor is arranged at one side of the bottom of the pulverizing chamber, the output end of the second motor is connected to the second screw conveyor, and the second motor is used to drive the second screw conveyor to move.

[0025] Furthermore, the sensor group includes:

[0026] A temperature sensor, a humidity sensor and a wind speed sensor, wherein the temperature sensor and the humidity sensor are provided in plurality, and the plurality of the temperature sensors and the plurality of the humidity sensors are evenly arranged on the inner wall of the drying chamber, and the wind speed sensor is located inside the drying chamber;

[0027] A weight sensor is located on the inner bottom wall of the drying chamber, and the weight sensor is used to monitor the weight of the sample in real time.

[0028] Furthermore, the control device comprises:

[0029] a collection unit, used for collecting depth data of the sample at several positions in the drying chamber after the sample enters the drying chamber, establishing a depth data set, obtaining an average depth of the sample entering the drying chamber according to the depth data set, and determining a drying temperature, a drying wind speed and a first time interval according to the average depth; and further used for collecting an initial weight of the sample entering the drying chamber, and then collecting the weight of the sample entering the drying chamber at every first time interval;

[0030] a judgment unit, configured to calculate a drying rate of the sample according to the weight of the sample at a current time interval and the weight of the sample at a previous time interval, compare the drying rate with a preset drying rate threshold, and judge whether to adjust the drying temperature, drying wind speed and first time interval according to the comparison result;

[0031] an adjusting unit, configured to collect the humidity inside the drying chamber when the judging unit determines to adjust the drying temperature, the drying wind speed and the first time interval, adjust the drying temperature, the drying wind speed and the first time interval according to the humidity, obtain the adjusted second time interval, and then collect the weight data of the sample entering the drying chamber every second time interval;

[0032] The adjustment unit is also used to calculate the humidity change rate of the sample based on the humidity at a current time interval and the humidity at a previous time interval inside the drying chamber, compare the humidity change rate with a preset humidity change rate threshold, and determine whether the sample entering the drying chamber is completely dried based on the comparison result.

[0033] Further, obtaining an average depth of the samples entering the drying chamber according to the depth data set, and determining the drying temperature, the drying wind speed and the first time interval according to the average depth, includes:

[0034] The drying temperature is obtained by the following formula:

[0035] Tt=Tb+k×D;

[0036] The drying wind speed is obtained by the following formula:

[0037] Vt=Vb+c×D;

[0038] The first time interval is obtained by the following formula:

[0039] Δt=Δtb-m×D;

[0040] Among them, Tt represents the drying temperature; Tb represents the basic temperature, that is, the drying temperature when the depth of the sample is zero; k represents the temperature increment coefficient; D represents the average depth of the sample; Vt represents the drying wind speed; Vb represents the basic wind speed, that is, the drying wind speed when the depth of the sample is zero; c represents the depth coefficient; Δt represents the first time interval; Δtb represents the basic time interval, that is, the time interval when the depth of the sample is zero; m represents the time coefficient.

[0041] Further, the drying rate is compared with a preset drying rate threshold, and judging whether to adjust the drying temperature, drying wind speed and first time interval inside the drying chamber according to the comparison result includes:

[0042] When the drying rate is greater than or equal to the drying rate threshold, determining to adjust the drying temperature, drying wind speed and first time interval inside the drying chamber;

[0043] When the drying rate is less than the drying rate threshold, determining not to adjust the drying temperature, drying wind speed and first time interval inside the drying chamber;

[0044] When it is determined that the drying temperature and the drying wind speed inside the drying chamber are to be adjusted, the humidity inside the drying chamber is collected, and the drying temperature and the drying wind speed are adjusted according to the humidity;

[0045] Subtracting the humidity from the standard humidity to obtain a humidity difference;

[0046] Comparing the humidity difference with a humidity difference threshold, and adjusting the drying temperature and drying wind speed according to the comparison result;

[0047] When the humidity difference is greater than the humidity difference threshold, it is determined that the drying temperature and the drying wind speed are increased;

[0048] When the humidity difference is less than or equal to the humidity difference threshold, it is determined that the drying temperature and the drying wind speed remain unchanged.

[0049] Further, adjusting the first time interval according to the humidity and acquiring the adjusted second time interval includes:

[0050] The second time interval is obtained by the following formula:

[0051] ΔTa=Δt×[1+γ(ΔH / Δt)];

[0052] Among them, ΔTa represents the second time interval; Δt represents the first time interval; γ represents the influence coefficient of humidity change on the time interval; ΔH represents the humidity change measured in the previous time interval.

[0053] Further, the humidity change rate of the sample is calculated according to the humidity of the current time interval and the humidity of the previous time interval inside the drying chamber, the humidity change rate is compared with a preset humidity change rate threshold, and it is judged whether the sample entering the drying chamber is completely dried according to the comparison result, including:

[0054] When the humidity change rate is less than the humidity change rate threshold for two or more consecutive times, it is determined that the sample entering the drying chamber is completely dried.

[0055] Compared with the prior art, the beneficial effects of the present invention are as follows: the sample preparation device for soil organic carbon detection of the present invention can accurately control the drying process by real-time monitoring of the humidity and temperature in the drying chamber, avoid over-drying or incomplete drying of the sample, thereby improving the accuracy and repeatability of the detection result; adjust the drying temperature and drying wind speed according to the average depth of the sample, so that the drying process is more efficient, while avoiding damage to the sample due to excessive temperature and ensuring the integrity of the sample; by calculating the humidity change rate and comparing it with a pre-set threshold, it is possible to accurately judge whether the sample is completely dried, avoiding the subjectivity and inaccuracy of manual judgment; by adjusting the drying time interval, the drying process can be further optimized, the drying efficiency can be improved, and the energy consumption can be reduced; the sample preparation device of the present invention is light in material, easy to move, and convenient.

[0056] The sample preparation device for soil organic carbon detection of the present invention can determine that the particle size range of the sample entering the drying chamber is about 2 mm by using the first sieve and the second sieve, further ensuring the uniformity and representativeness of the sample. In the specific implementation process, the operator can first put the soil sample to be detected into the device, and make the sample pass through the first sieve and the second sieve by vibration or rotation to obtain a sample with uniform particle size.

[0057] The present invention monitors the weight change of the sample in real time through a weight sensor. When the weight change rate of the sample is lower than a preset threshold, it can be judged that the sample has been dried to a constant weight, thereby automatically stopping the drying process. This automatic monitoring can improve efficiency and ensure drying quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0059] Figure 1 A schematic diagram of the overall structure of a sample preparation device for soil organic carbon detection provided by an embodiment of the present invention;

[0060] Figure 2 A schematic structural diagram of a control device of a sample preparation device for soil organic carbon detection provided by an embodiment of the present invention.

[0061] In the figure: 100, device body; 111, feed hopper; 112, first screw conveyor; 113, first motor; 121, crushing chamber; 122, crushing roller; 123, first screen; 124, second screw conveyor; 125, second motor; 126, second screen; 127, collecting chamber; 130, drying chamber; 131, temperature sensor; 132, humidity sensor; 133, weight sensor; 140, control device; 141, collection unit; 142, judgment unit; 143, adjustment unit. DETAILED DESCRIPTION

[0062] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0063] See also Figure 1-2 As shown, in some embodiments of the present application, this embodiment provides a sample preparation device for soil organic carbon detection, comprising:

[0064] Device body 100;

[0065] A feed assembly, located on one side of the device body 100;

[0066] A separation component is located in the middle of the device body 100 and is used to crush and separate the sample;

[0067] The drying chamber 130 is located inside the device body 100 and on the side of the separation component away from the feeding component. A feeding port is provided at the top of the drying chamber 130. A sensor group is also provided inside the drying chamber 130. The sensor group is located on the inner side wall and the inner bottom wall of the drying chamber 130. A heating device for drying the sample is also provided inside the drying chamber 130.

[0068] The control device 140 is located outside the device body 100 and is connected to the feeding assembly, the separation assembly, and the drying chamber 130. The control device 140 is used to control the operation of the feeding assembly and the separation assembly.

[0069] It can be seen that the feeding component is used to transport the collected soil to the interior of the device body 100, thereby improving the efficiency and stability of sample transmission; the separation component is used to crush and screen the samples entering the interior of the device body 100, and discharge the impurities through the separation port, thereby having higher separation efficiency and purity; the drying chamber 130 ensures that the samples are dried under suitable temperature and humidity conditions to ensure the accuracy of the test results; the control device 140 is used to achieve precise control of the entire sample preparation device to ensure that the samples reach the optimal state during the processing at each stage.

[0070] Specifically, the feed assembly includes:

[0071] A feed hopper 111 is located at one side of the device body 100 and is used to temporarily store samples;

[0072] A first screw conveyor 112 is horizontally arranged at the bottom of the feed hopper 111, one end of the first screw conveyor 112 is connected to the feed hopper 111, and the other end of the first screw conveyor 112 extends to the top of the separation component. The first screw conveyor 112 is used to convey the sample from the feed hopper 111 to the separation component;

[0073] The first motor 113 is disposed on a side of the feed hopper 111 away from the separation assembly. The output end of the first motor 113 is connected to the first screw conveyor 112 . The first motor 113 is used to drive the first screw conveyor 112 to move.

[0074] It can be seen that the design of the first screw conveyor 112 makes it difficult for the sample to be blocked during transportation and can maintain a continuous and stable conveying speed, thereby ensuring that the sample is evenly processed in the separation component; the use of the first motor 113 provides power guarantee for the entire feeding process, and its precise speed control can adapt to soil samples of different types and humidity, ensuring the uniformity and consistency of the sample before entering the separation component.

[0075] Specifically, the separation components include:

[0076] The crushing chamber 121 is located in the middle of the device body. A feed inlet is provided at the top of the crushing chamber 121, and the output end of the first screw conveyor extends into the feed inlet;

[0077] The crushing roller 122 is located inside the crushing chamber 121;

[0078] The first screen 123 is located at the bottom of the crushing roller 122, and the first screen 123 is inclined, the high end of the first screen 123 is located at the side away from the first screw conveyor, and the low end of the first screen 123 is provided with a first separation port; wherein the aperture of the first screen 123 is 2.1 mm;

[0079] The second screen 126 is located at the bottom of the first screen 123, and the second screen 126 is inclined. The high end of the second screen 126 is located on the side close to the first screw conveyor, and the low end of the second screen 126 is provided with a second separation port; wherein the aperture of the second screen 126 is 1.9 mm;

[0080] The vibration motor is located at the bottom of the second screen 126 .

[0081] Specifically, the separation components also include:

[0082] The collecting chamber 127 is located at one side of the bottom of the crushing chamber 121;

[0083] A second screw conveyor 124 is disposed at the bottom of the crushing chamber 121, one end of the second screw conveyor 124 extends to the top of the collecting chamber 127, and the other end is connected to the crushing chamber 121;

[0084] The second motor 125 is disposed at one side of the bottom of the grinding chamber 121 . The output end of the second motor 125 is connected to the second screw conveyor 124 . The second motor 125 is used to drive the second screw conveyor 124 to move.

[0085] It can be seen that the crushing roller 122 allows the sample to be fully crushed in the crushing chamber 121. At the same time, with the screens of different apertures, the crushed samples can be graded and screened according to the particle size to ensure that the samples entering the drying chamber have higher purity and consistency, that is, to ensure that the particle size is about 2 mm. The addition of the vibration motor further improves the screening efficiency and avoids the problem of screen blockage. In addition, the use of the second screw conveyor 124 and the second motor 125 can quickly and stably transport the screened unwanted samples to the collection chamber 127. Such a design not only improves the degree of automation of the sample preparation device, but also greatly improves the efficiency and accuracy of sample processing.

[0086] Specifically, the sensor group includes:

[0087] Furthermore, the sensor group includes: a temperature sensor 131, a humidity sensor 132 and a wind speed sensor, there are several temperature sensors 131 and several humidity sensors 132, several temperature sensors 131 and several humidity sensors 132 are evenly arranged on the inner wall of the drying chamber, and the wind speed sensor is located inside the drying chamber; a weight sensor 133 is located on the inner bottom wall of the drying chamber 130, and the weight sensor 133 is used to monitor the weight of the sample in real time.

[0088] It can be seen that the uniform arrangement of the temperature sensor 131 and the humidity sensor 132 ensures the uniformity of temperature and humidity in the drying chamber 130, so that the sample can be evenly treated throughout the drying process, avoiding sample damage caused by local overheating or overhumidity; the wind speed sensor is used to monitor the wind speed in real time during the drying process to ensure drying efficiency and uniformity; the real-time monitoring function of the weight sensor 133 can accurately track the weight change of the sample during the drying process, providing a scientific basis for the control of the drying time, ensuring that the sample can be stopped in time after reaching the appropriate drying degree, avoiding organic carbon loss caused by excessive drying.

[0089] Specifically, the control device 140 includes: a collection unit 141, which is used to collect depth data of the sample at several positions in the drying chamber 130 after the sample enters the drying chamber 130, establish a depth data set, obtain the average depth of the sample entering the drying chamber 130 according to the depth data set, and determine the drying temperature, drying wind speed and the first time interval according to the average depth; it is also used to collect the initial weight of the sample entering the drying chamber 130, and then collect the weight of the sample entering the drying chamber 130 every first time interval; a judgment unit 142, which is used to calculate the drying rate of the sample according to the weight of the sample at the current time interval and the weight of the previous time interval, compare the drying rate with a pre-set drying rate threshold, and judge whether to adjust the drying temperature according to the comparison result. The adjusting unit 143 is used to collect the humidity inside the drying chamber 130 when the judging unit 142 determines that the drying temperature, the drying wind speed and the first time interval are to be adjusted, and to adjust the drying temperature, the drying wind speed and the first time interval according to the humidity, and to obtain the adjusted second time interval, and then collect the weight data of the sample entering the drying chamber 130 every second time interval; the adjusting unit 143 is also used to calculate the humidity change rate of the sample according to the humidity of the current time interval and the humidity of the previous time interval inside the drying chamber 130, compare the humidity change rate with a preset humidity change rate threshold, and determine whether the sample entering the drying chamber 130 is completely dried according to the comparison result.

[0090] It can be seen that the design of the control device 140 makes the entire drying process highly automated and intelligent. The depth and weight of the sample are monitored in real time by the acquisition unit 141, so the drying process can be accurately controlled to ensure that the sample achieves the best drying effect during the drying process; the introduction of the judgment unit 142 further improves the accuracy of the drying process. Through real-time calculation and comparison of the drying rate, the drying temperature and drying wind speed can be adjusted in time to avoid the problem of insufficient or excessive drying of the sample; the setting of the adjustment unit 143 ensures the flexibility and adaptability of the drying process. Through the collection and analysis of the humidity data inside the drying chamber 130, the time interval for sample drying can be dynamically adjusted to ensure that the humidity change rate of the sample during the drying process remains within a reasonable range, thereby improving the drying efficiency.

[0091] Specifically, obtaining the average depth of the samples entering the drying chamber 130 according to the depth data set, and determining the drying temperature, the drying wind speed and the first time interval according to the average depth include:

[0092] The drying temperature is obtained by the following formula:

[0093] Tt=Tb+k×D;

[0094] The drying wind speed is obtained by the following formula:

[0095] Vt=Vb+c×D;

[0096] The first time interval is obtained by:

[0097] Δt=Δtb-m×D;

[0098] Among them, Tt represents the drying temperature; Tb represents the basic temperature, that is, the drying temperature when the depth of the sample is zero; k represents the temperature increment coefficient; D represents the average depth of the sample; Vt represents the drying wind speed; Vb represents the basic wind speed, that is, the drying wind speed when the depth of the sample is zero; c represents the depth coefficient; Δt represents the first time interval; Δtb represents the basic time interval, that is, the time interval when the depth of the sample is zero; m represents the time coefficient.

[0099] It can be seen that, through the above formula, the setting of the drying temperature takes into account the average depth of the sample and ensures the uniformity of the drying process; the basic temperature Tb is set according to the drying temperature when the depth of the sample in the drying chamber 130 is zero, which is usually a preset reference value to ensure that the sample can be properly dried in the initial stage; the temperature increment coefficient k is an adjustable parameter, which can be adjusted according to the characteristics and drying requirements of different samples to ensure that when the sample depth increases, the drying temperature increases accordingly, thereby compensating for the loss of heat transfer during the drying process; the basic time interval Δtb is set according to the time interval when the depth of the sample in the drying chamber 130 is zero, which is usually a preset reference value to ensure that the sample can be properly dried in the initial stage; the time coefficient m is an adjustable parameter, which can be adjusted according to the characteristics and drying requirements of different samples to ensure that when the sample depth increases, the drying time increases accordingly, thereby compensating for the loss of drying efficiency during the drying process.

[0100] Among them, the highest drying temperature is 65℃.

[0101] Specifically, the drying rate is compared with a preset drying rate threshold, and judging whether to adjust the drying temperature, drying wind speed and first time interval inside the drying chamber 130 according to the comparison result includes:

[0102] When the drying rate is greater than or equal to the drying rate threshold, it is determined that the drying temperature, drying wind speed and first time interval inside the drying chamber 130 are adjusted;

[0103] When the drying rate is less than the drying rate threshold, it is determined that the drying temperature, drying wind speed and first time interval inside the drying chamber 130 are not adjusted;

[0104] When it is determined that the drying temperature and drying wind speed inside the drying chamber 130 are to be adjusted, the humidity inside the drying chamber 130 is collected, and the drying temperature and drying wind speed are adjusted according to the humidity;

[0105] Subtract the humidity from the standard humidity to obtain the humidity difference;

[0106] The humidity difference is compared with the humidity difference threshold, and the drying temperature and the drying wind speed are adjusted according to the comparison result;

[0107] When the humidity difference is greater than the humidity difference threshold, it is determined that the drying temperature and the drying wind speed are increased;

[0108] When the humidity difference is less than or equal to the humidity difference threshold, it is determined that the drying temperature and the drying wind speed remain unchanged.

[0109] It can be seen that by setting the drying rate threshold, the progress of the drying process can be effectively controlled. When the drying rate is too fast, the sample may be damaged due to overheating, resulting in the loss of organic carbon; when the drying rate is too slow, the drying time will be extended and the production efficiency will be reduced. By real-time monitoring of the drying rate and comparing it with its threshold, the drying temperature and drying wind speed can be adjusted in time to ensure that the sample achieves the best drying effect during the drying process.

[0110] It is understandable that when the drying temperature and the drying wind speed are increased, an increase coefficient is obtained. The increase coefficient is proportional to the humidity difference.

[0111] It is understood that the weight change of the sample is monitored in real time by the weight sensor 133. When the weight change rate of the sample is lower than a preset threshold, it can be determined that the sample has been dried to a constant weight, thereby automatically stopping the drying process. This automatic monitoring can improve efficiency and ensure drying quality.

[0112] In this embodiment, a drying temperature threshold is set, which is preferably 65° C. When the drying temperature exceeds the drying temperature threshold, when the temperature reaches 65° C., the control unit prevents further heating by disconnecting the power supply of the heating device, and resumes operation only after the temperature drops to a safe range.

[0113] Specifically, adjusting the first time interval according to the humidity and obtaining the adjusted second time interval includes:

[0114] The second time interval is obtained by:

[0115] ΔTa=Δt×[1+γ(ΔH / Δt)];

[0116] Among them, ΔTa represents the second time interval; Δt represents the first time interval; γ represents the influence coefficient of humidity change on the time interval; ΔH represents the humidity change measured in the previous time interval.

[0117] It can be seen that, through the above formula, the adjustment of the second time interval takes into account the influence of the humidity change inside the drying chamber 130 on the drying process. The influence coefficient γ of the humidity change on the time interval is an adjustable parameter, which can be adjusted according to the characteristics and drying requirements of different samples to ensure that when the humidity changes greatly, the time interval is adjusted accordingly, thereby ensuring that the humidity change rate of the sample during the drying process remains within a reasonable range.

[0118] Specifically, the humidity change rate of the sample is calculated according to the humidity of the current time interval and the humidity of the previous time interval inside the drying chamber 130, the humidity change rate is compared with a preset humidity change rate threshold, and whether the sample entering the drying chamber 130 is completely dried is determined according to the comparison result, including:

[0119] When the humidity change rate is less than the humidity change rate threshold for two or more consecutive times, it is determined that the sample entering the drying chamber 130 is completely dried.

[0120] It can be seen that by setting the humidity change rate threshold, it is possible to effectively determine whether the sample has been completely dried. When the humidity change rate is lower than the threshold, it indicates that the water in the sample has basically evaporated and the sample has reached the expected drying state. This judgment method avoids the inaccuracy of judging the degree of drying based solely on time or weight changes, and improves the reliability of the drying process and the consistency of sample quality.

[0121] In summary, the sample preparation device for soil organic carbon detection provided in this embodiment can ensure that the sample achieves the best drying effect during the drying process by real-time monitoring and dynamic adjustment of key parameters in the drying process, such as temperature, humidity and time interval. And by accurately controlling the drying rate and humidity change rate, the problem of insufficient or excessive drying of the sample can be effectively avoided, thereby improving the drying efficiency and consistency of sample quality.

[0122] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0123] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0124] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0125] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A sample preparation device for soil organic carbon detection, characterized in that: include: device body; A feed assembly, located on one side of the device body; A separation component is located in the middle of the device body, and is used to crush and separate the sample; A drying chamber is located inside the device body and on a side of the separation component away from the feeding component. A feeding port is provided at the top of the drying chamber. A sensor group is also provided in the drying chamber. The sensor group is located on the inner side wall and the inner bottom wall of the drying chamber. A heating device for drying the sample is also provided inside the drying chamber. The control device is located outside the device body and is connected to the feeding assembly, the separation assembly and the drying chamber. The control device is used to control the operation of the feeding assembly and the separation assembly.

2. The sample preparation device for soil organic carbon detection according to claim 1, characterized in that: The feed assembly comprises: A feed hopper, located at one side of the device body, and used for temporarily storing the sample; A first screw conveyor is horizontally arranged at the bottom of the feed hopper, one end of the first screw conveyor is connected to the feed hopper, and the other end of the first screw conveyor extends to the top of the separation assembly, and the first screw conveyor is used to convey the sample from the feed hopper to the separation assembly; The first motor is arranged on a side of the feed hopper away from the separation assembly. The output end of the first motor is connected to the first screw conveyor. The first motor is used to drive the first screw conveyor to move.

3. The sample preparation device for soil organic carbon detection according to claim 2, characterized in that: The separation component comprises: A crushing chamber is located in the middle of the device body, a feed port is provided at the top of the crushing chamber, and the output end of the first screw conveyor extends into the feed port; A crushing roller, located inside the crushing chamber; A first screen is located at the bottom of the crushing roller, and the first screen is inclined, the high end of the first screen is located at a side away from the first screw conveyor, and a first separation port is provided at the low end of the first screen; wherein the aperture of the first screen is 2.1 mm; A second screen is located at the bottom of the first screen, and the second screen is inclined, the high end of the second screen is located on the side close to the first screw conveyor, and a second separation port is provided at the low end of the second screen; wherein the aperture of the second screen is 1.9 mm; The vibration motor is located at the bottom of the second screen.

4. The sample preparation device for soil organic carbon detection according to claim 3, characterized in that: The separation assembly further comprises: A collecting chamber, located at one side of the bottom of the crushing chamber; A second screw conveyor is arranged at the bottom of the crushing chamber, one end of the second screw conveyor extends to the top of the collecting chamber, and the other end is connected to the crushing chamber; The second motor is arranged at one side of the bottom of the pulverizing chamber, the output end of the second motor is connected to the second screw conveyor, and the second motor is used to drive the second screw conveyor to move.

5. The sample preparation device for soil organic carbon detection according to claim 4, characterized in that: The sensor group includes: A temperature sensor, a humidity sensor and a wind speed sensor, wherein the temperature sensor and the humidity sensor are provided in plurality, and the plurality of the temperature sensors and the plurality of the humidity sensors are evenly arranged on the inner wall of the drying chamber, and the wind speed sensor is located inside the drying chamber; A weight sensor is located on the inner bottom wall of the drying chamber, and the weight sensor is used to monitor the weight of the sample in real time.

6. The sample preparation device for soil organic carbon detection according to claim 5, characterized in that: The control device comprises: a collection unit, used for collecting depth data of the sample at several positions in the drying chamber after the sample enters the drying chamber, establishing a depth data set, obtaining an average depth of the sample entering the drying chamber according to the depth data set, and determining a drying temperature, a drying wind speed and a first time interval according to the average depth; and further used for collecting an initial weight of the sample entering the drying chamber, and then collecting the weight of the sample entering the drying chamber at every first time interval; a judgment unit, configured to calculate a drying rate of the sample according to the weight of the sample at a current time interval and the weight of the sample at a previous time interval, compare the drying rate with a preset drying rate threshold, and judge whether to adjust the drying temperature, drying wind speed and first time interval according to the comparison result; an adjusting unit, configured to collect the humidity inside the drying chamber when the judging unit determines to adjust the drying temperature, the drying wind speed and the first time interval, adjust the drying temperature, the drying wind speed and the first time interval according to the humidity, obtain the adjusted second time interval, and then collect the weight data of the sample entering the drying chamber every second time interval; The adjustment unit is also used to calculate the humidity change rate of the sample based on the humidity at a current time interval and the humidity at a previous time interval inside the drying chamber, compare the humidity change rate with a preset humidity change rate threshold, and determine whether the sample entering the drying chamber is completely dried based on the comparison result.

7. The sample preparation device for soil organic carbon detection according to claim 6, characterized in that: Acquiring an average depth of the samples entering the drying chamber according to the depth data set, and determining a drying temperature, a drying wind speed, and a first time interval according to the average depth, comprising: The drying temperature is obtained by the following formula: Tt=Tb+k×D; The drying wind speed is obtained by the following formula: Vt=Vb+c×D; The first time interval is obtained by the following formula: Δt=Δtb-m×D; Among them, Tt represents the drying temperature; Tb represents the basic temperature, that is, the drying temperature when the depth of the sample is zero; k represents the temperature increment coefficient; D represents the average depth of the sample; Vt represents the drying wind speed; Vb represents the basic wind speed, that is, the drying wind speed when the depth of the sample is zero; c represents the depth coefficient; Δt represents the first time interval; Δtb represents the basic time interval, that is, the time interval when the depth of the sample is zero; m represents the time coefficient.

8. The sample preparation device for soil organic carbon detection according to claim 7, characterized in that: The drying rate is compared with a preset drying rate threshold, and judging whether to adjust the drying temperature, drying wind speed and first time interval inside the drying chamber according to the comparison result, including: When the drying rate is greater than or equal to the drying rate threshold, determining to adjust the drying temperature, drying wind speed and first time interval inside the drying chamber; When the drying rate is less than the drying rate threshold, determining not to adjust the drying temperature, drying wind speed and first time interval inside the drying chamber; When it is determined that the drying temperature and the drying wind speed inside the drying chamber are to be adjusted, the humidity inside the drying chamber is collected, and the drying temperature and the drying wind speed are adjusted according to the humidity; Subtracting the humidity from the standard humidity to obtain a humidity difference; Comparing the humidity difference with a humidity difference threshold, and adjusting the drying temperature and drying wind speed according to the comparison result; When the humidity difference is greater than the humidity difference threshold, it is determined that the drying temperature and the drying wind speed are increased; When the humidity difference is less than or equal to the humidity difference threshold, it is determined that the drying temperature and the drying wind speed remain unchanged.

9. The sample preparation device for soil organic carbon detection according to claim 8, characterized in that: When the first time interval is adjusted according to the humidity and the adjusted second time interval is obtained, the method includes: The second time interval is obtained by the following formula: ΔTa=Δt×[1+γ(ΔH / Δt)]; Among them, ΔTa represents the second time interval; Δt represents the first time interval; γ represents the influence coefficient of humidity change on the time interval; ΔH represents the humidity change measured in the previous time interval.

10. The sample preparation device for soil organic carbon detection according to claim 9, characterized in that: Calculating the humidity change rate of the sample according to the humidity of the current time interval and the humidity of the previous time interval inside the drying chamber, comparing the humidity change rate with a preset humidity change rate threshold, and judging whether the sample entering the drying chamber is completely dried according to the comparison result, including: When the humidity change rate is less than the humidity change rate threshold for two or more consecutive times, it is determined that the sample entering the drying chamber is completely dried.

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