Biochar production line tested straw raw material feeding device and method

Abstract

The invention discloses a feeding device and method for a tested straw raw material of a biochar production line, and the device comprises a feeding mechanism which comprises a feeding hopper, a feeding bin body and a feeding pushing part, the feeding hopper is arranged at the front part of the feeding bin body, and the feeding pushing part is arranged in the feeding bin body; the storage bin is connected with the feeding mechanism; the feeding mechanism is connected with the storage bin and comprises a feeding bin body and a feeding pushing component, and the feeding pushing component is installed in the feeding bin body; the detection mechanism comprises a shell, a light source, a spectrograph, a pressure sensor and a controller, the light source, the spectrograph and the controller are installed in the shell, and the pressure sensor is arranged in the storage bin; the light source, the spectrograph and the pressure sensor are respectively connected with the controller; the controller is connected with the feeding pushing component and the feeding pushing component. The controller adjusts the feeding speed and / or the feeding speed according to the bin wall pressure of the tested straw raw materials on the storage bin, so that the compactness of the straw raw materials is within a set value. The invention further discloses a feeding method of the tested straw raw materials on the biochar production line.

Description

Technical Field

[0001] The invention relates to a biochar feeding detection technology, in particular to a feeding device and method for self-adjusting and increasing the stacking density of a detected straw raw material to facilitate detection. Background Art

[0002] At present, the tested straw is mainly returned to the field directly. Although the tested straw can improve the soil directly, it will produce too much organic acid during the decomposition process, which will harm the plant roots. Under the influence of the low temperature and cold climate in the north, the tested straw is difficult to rot, which will affect the emergence rate in the second year and cause pests and diseases. The carbonization of the tested straw is a method of pyrolyzing the tested crop straw under the conditions of lack of oxygen or limited oxygen supply and temperature below 700℃ to form biochar for soil improvement. It can effectively avoid the above hazards and realize soil nutrient supplementation and carbon sequestration at the same time. The analysis of the basic characteristics of the tested straw biochar raw materials and products is the basis and prerequisite for the application of the tested straw carbonization, so as to clarify the quality and grade of biochar products, achieve high quality and high price and optimize the utilization method.

[0003] However, the existing research on the detection of tested straw raw materials mostly uses spectral static modeling of fine powder tested straw samples under laboratory conditions. However, for online detection on the production line, the coarsely cut and loose tested straw raw materials have low density, resulting in large spectral noise, which greatly reduces the detection accuracy. Therefore, how to achieve high-precision detection of tested straw raw materials is a technical problem that needs to be urgently solved in this field. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the prior art only detects fine powdered straw raw materials in the laboratory, while the online detection of the straw raw materials on the production line has the problems of large spectral noise and low detection accuracy. A feeding device and method for the straw raw materials on a biochar production line are provided, which increase the stacking density of the straw raw materials on the production line through self-adjustment to achieve low-noise and high-precision detection of the straw raw materials on the production line.

[0005] In order to achieve the above-mentioned object, the present invention provides a feeding device for the straw raw material to be tested in a biochar production line, which comprises:

[0006] The feeding mechanism comprises a feeding hopper, a feeding bin body and a feeding pushing component, wherein the feeding hopper is arranged at the front part of the feeding bin body, and the feeding pushing component is arranged in the feeding bin body;

[0007] A material storage bin, the head end of which is connected to the tail end of the feeding mechanism;

[0008] A feeding mechanism, the front end of which is connected to the rear end of the storage bin; the feeding mechanism comprises a feeding bin body and a feeding pushing component, and the feeding pushing component is installed in the feeding bin body; and

[0009] The detection mechanism includes a shell, a light source, a spectrometer, a plurality of pressure sensors and a controller, wherein the light source, the spectrometer and the controller are respectively installed in the shell, and the plurality of pressure sensors are respectively arranged in the storage bin; the light source, the spectrometer and the plurality of pressure sensors are respectively connected to the controller; the controller is respectively connected to the feed pushing component and the feed pushing component; the controller adjusts the feed speed and / or the feed speed according to the pressure of the tested straw raw material on the bin wall, so that the density of the tested straw raw material is within the set value.

[0010] The straw raw material feeding device for the biochar production line is tested, wherein the feed bin body and the feeding bin body are both pipe structures, and the pipe walls of the feed bin body and the feeding bin body are parallel to each other and are inclined at 45° to the horizontal plane.

[0011] The above-mentioned biochar production line tested straw raw material feeding device, wherein the feed pushing component includes a feed motor and a feed auger, the feed motor is installed at the front end of the feed silo body and is connected to the feed auger; the feed auger is installed in the feed silo body, and the feed auger is coaxially arranged with the feed silo body; the feed motor drives the feed auger to rotate and push the tested straw raw material to the storage silo.

[0012] The above-mentioned straw raw material feeding device for the biochar production line is tested, wherein the feeding hopper is installed just above the pipe wall opening of the feeding silo body.

[0013] The above-mentioned biochar production line is a device for feeding straw raw materials to be tested, wherein the feeding and pushing component includes a feeding motor and a feeding auger, the feeding motor is installed at the front end of the feeding bin body and is connected to the feeding auger; the feeding auger is installed in the feeding bin body, and the feeding auger is coaxially arranged with the feeding bin body; the end of the feeding bin body is connected to the carbonization production line, and the feeding motor drives the feeding auger to rotate and push the tested straw raw material to the carbonization production line.

[0014] In the above-mentioned biochar production line straw raw material feeding device, the detection mechanism determines the installation position according to the pressure between the straw raw materials to be tested, the pressure of the straw raw materials to be tested on the warehouse wall and the fluidity of the straw raw materials to be tested.

[0015] In the above-mentioned biochar production line straw raw material feeding device, the detection mechanism is arranged on one side above the front end of the feeding bin body.

[0016] The above-mentioned biochar production line straw raw material feeding device is tested, wherein the detection mechanism also includes a display screen, the controller is a Raspberry Pi, and the display screen is connected to the controller.

[0017] In order to better achieve the above-mentioned purpose, the present invention also provides a method for feeding a tested straw raw material of a biochar production line, wherein the density of the tested straw raw material is adjusted by using the above-mentioned feeding device for the tested straw raw material of the biochar production line, comprising the following steps:

[0018] S100, feeding the tested straw raw material into a feeding hopper, and a feeding mechanism transporting the tested straw raw material into a storage bin;

[0019] S200, the feeding mechanism transports the tested straw raw material at the bottom of the storage bin to the subsequent carbonization production line;

[0020] S300, after the straw raw material to be tested arrives at the storage bin, a plurality of pressure sensors distributed in the storage bin measure the pressure of the straw raw material to be tested on the bin wall and send the pressure to the controller, and the controller calculates and obtains the density of the straw raw material to be tested;

[0021] S400, if the density of the straw raw material to be tested is within the set value, the feeding mechanism and the feeding mechanism work at the current speed, and the controller controls the light source and the spectrometer to start working for detection; and

[0022] S500: If the density of the straw material to be tested is lower than or higher than a set value, the controller adjusts the conveying speed of the feeding mechanism and / or the feeding mechanism accordingly to keep the density of the straw material to be tested in the storage bin within a set range.

[0023] In the above-mentioned method for feeding the tested straw raw material of the biochar production line, in step S500, when the controller adjusts the conveying speed of the feeding mechanism and / or the feeding mechanism, the relationship between the data collected by the pressure sensor and the motor speed of the feeding mechanism and the feeding mechanism is as follows:

[0024] When T is lower than the set value range T1-T2:

[0025] N1=δ×(T1-β×(α1P1+α2P2+α3P3+α4P4))+N;

[0026] N2=δ×(β×(α1P1+α2P2+α3P3+α4P4)-T1)+N;

[0027] When T is higher than the set value range T1-T2:

[0028] N1=δ×(T2-β×(α1P1+α2P2+α3P3+α4P4))+N;

[0029] N2=δ×(β×(α1P1+α2P2+α3P3+α4P4)-T2)+N;

[0030] Among them, T is the real-time density of the straw raw material measured in the storage bin, T1 is the minimum setting value of the density, T2 is the maximum setting value of the density, P1 is the pressure value measured by the first pressure sensor on the side wall of the storage bin, P2 is the pressure value measured by the second pressure sensor, P3 is the pressure value measured by the third pressure sensor, and P4 is the pressure value measured by the fourth pressure sensor; β is the relationship coefficient between the pressure and density of the pressure sensor under the measured straw of different plants obtained in the experiment, α1 is the weight of the data measured by the first pressure sensor, α2 is the weight of the data measured by the second pressure sensor, α3 is the weight of the data measured by the third pressure sensor, α4 is the weight of the data measured by the fourth pressure sensor, δ is the coefficient of the difference between the motor speed and the density; N1 is the real-time speed of the feeding motor, N2 is the real-time speed of the feeding motor, and N is the difference between the feeding motor and the feeding motor. The same speed under the condition of .

[0031] The technical effects of the present invention are:

[0032] The present invention aims at the problem that in the detection of the straw biochar raw materials in the prior art, the coarsely cut and loose straw materials to be tested have large spectral noise and low detection accuracy due to low density. The present invention detects the density of the straw raw materials to be tested in the storage bin by a detection mechanism, and then autonomously adjusts the feeding and conveying speeds to control the density of the raw materials, that is, self-adjusts to increase the stacking density of the straw raw materials to be tested to facilitate detection, thereby reducing spectral noise and improving detection accuracy.

[0033] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of a device according to an embodiment of the present invention;

[0035] Figure 2 for Figure 1 A front view of

[0036] Figure 3 is a cross-sectional view of 2;

[0037] Figure 4 This is a schematic diagram of the structure of a detection mechanism according to an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of the installation of a pressure sensor according to an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of the installation position of a detection mechanism according to an embodiment of the present invention;

[0040] Figure 7 A force diagram of a simulated housing according to an embodiment of the present invention;

[0041] Figure 8 A simulated inter-particle pressure diagram according to an embodiment of the present invention;

[0042] Fig. 9 A schematic diagram of a simulated five-point sampling method according to an embodiment of the present invention;

[0043] Fig.10 A simulation trajectory map according to an embodiment of the present invention.

[0044] Among them, the reference numerals

[0045] 1Feeding mechanism

[0046] 11 Feeding motor

[0047] 12 Feeding hopper

[0048] 13 Feeding silo

[0049] 14 Feeding auger

[0050] 2 Storage silos

[0051] 3 Feeding mechanism

[0052] 31 Feeding motor

[0053] 32 feeding bin body

[0054] 33 feeding auger

[0055] 4. Testing agency

[0056] 41 Shell

[0057] 42 Light Source

[0058] 43 Spectrometer

[0059] 44First pressure sensor

[0060] 45 Second pressure sensor

[0061] 46Third pressure sensor

[0062] 47 Fourth pressure sensor

[0063] 48 Display

[0064] 49 Controller DETAILED DESCRIPTION

[0065] The structural principle and working principle of the present invention are described in detail below in conjunction with the accompanying drawings:

[0066] See also Figure 1-Figure 5 , Figure 1 is a schematic diagram of the structure of a device according to an embodiment of the present invention, Figure 2 for Figure 1Front view of Figure 3 is a cross-sectional view of 2, Figure 4 This is a schematic diagram of the structure of a detection mechanism 4 according to an embodiment of the present invention. Figure 5 The schematic diagram of the installation of the pressure sensor of one embodiment of the present invention. The straw raw material feeding device for the biochar production line of the present invention comprises: a feeding mechanism 1, comprising a feeding hopper 12, a feeding bin body 13 and a feeding pushing component, wherein the feeding hopper 12 is arranged at the front of the feeding bin body 13, and the feeding pushing component is arranged in the feeding bin body 13; a storage bin 2, the head end of which is connected to the end of the feeding mechanism 1; a feeding mechanism 3, the front end of which is connected to the tail end of the storage bin 2; the feeding mechanism 3 comprises a feeding bin body 32 and a feeding pushing component, wherein the feeding pushing component is installed in the feeding bin body 32; and a detection mechanism 4, comprising a housing 41, a light source 42, a spectrometer 43, a plurality of pressure sensors and a controller 49, wherein the light source 42, the spectrometer 43 and the controller 49 are respectively installed in the housing 41, and a plurality of pressure sensors are distributed in the storage bin. 2, the storage bin 2 is preferably rectangular as a whole, connected to the tail end of the feeding mechanism 1 at the upper left corner, and connected to the feeding mechanism 3 through a window at the bottom. Four staggered pressure sensors are installed on the bin wall, namely the first pressure sensor 44, the second pressure sensor 45, the third pressure sensor 46 and the fourth pressure sensor 47. The speed of the feeding mechanism 1 and the feeding mechanism 3 will affect the amount of the straw raw material to be measured in the storage bin 2, and then affect its density; the light source 42, the spectrometer 43 and the multiple pressure sensors are respectively connected to the controller 49; the controller 49 is respectively connected to the feeding pushing component and the feeding pushing component; the controller 49 adjusts the feeding speed and / or the feeding speed according to the pressure of the straw raw material to be measured on the bin wall of the storage bin 2, so that the density of the straw raw material to be measured is within the set range.

[0067] The feed bin body 13 and the feeding bin body 32 of this embodiment are preferably tube structures, and the tube walls of the feed bin body 13 and the feeding bin body 32 are parallel to each other and are inclined at 45° to the horizontal plane. Among them, the feed pushing component includes a feed motor 11 and a feed auger 14, the feed motor 11 is installed at the front end of the feed bin body 13 and connected to the feed auger 14; the feed auger 14 is installed in the feed bin body 13, and the feed auger 14 is coaxially arranged with the feed bin body 13; the feed motor 11 drives the feed auger 14 to rotate and push the measured straw raw material to the storage bin 2. The feeding hopper 12 is installed and fixed just above the tube wall opening of the feed bin body 13, and is used to feed the measured straw raw material. The feeding and pushing component includes a feeding motor 31 and a feeding auger 33. The feeding motor 31 is installed at the front end of the feeding bin body 32 and is connected to the feeding auger 33. The feeding auger 33 is installed in the feeding bin body 32, and the feeding auger 33 is coaxially arranged with the feeding bin body 32. The end of the feeding bin body 32 is connected to the carbonization production line, and the feeding motor 31 drives the feeding auger 33 to rotate and push the measured straw raw material to the carbonization production line.

[0068] See also Figure 6-Figure 10 , Figure 6 This is a schematic diagram of the installation position of the detection mechanism 4 according to an embodiment of the present invention. Figure 7 This is a force diagram of a simulated housing 41 according to an embodiment of the present invention. Figure 8 is a simulated inter-particle pressure diagram according to an embodiment of the present invention, Fig. 9 Schematic diagram of a simulated five-point sampling method according to an embodiment of the present invention. Fig.10 The simulation trajectory roadmap of an embodiment of the present invention. For different types of straw raw materials to be tested and different production line scales, the setting position of the spectrometer 43 should be different. The present invention adopts the following method to determine the setting position of the detection mechanism 4: after simulation, the density of the straw to be tested at the position detected by the spectrometer 43 should be higher, that is, the position where the pressure between the straws to be tested is larger in the simulation result; the density of the straw to be tested at the position detected by the spectrometer 43 should be higher, that is, the position where the pressure of the straw to be tested on the warehouse wall should be larger in the simulation result; the fluidity of the straw to be tested at the position detected by the spectrometer 43 should be better, and the straw raw materials to be tested should not be piled up. The detection mechanism 4 can be set at a suitable position after mechanical analysis for different production lines.

[0069] The present invention aims at the straw carbonization production line to be tested, and according to the size characteristics of its production line, a three-dimensional structural model is established at a ratio of 1:1, and simulation is performed. At the same time, the discrete element calibration of the tested corn straw is referred to in related research, and a rough-cut corn straw particle model is constructed using spherical and columnar particle structures, with a size of 12mm×6mm×6mm. According to the production situation of the production line, the rotation speed of the auger is set to 100rpm, and a particle factory is set at the tail end of the feeding mechanism 1 to generate the tested straw raw material, with a generation rate of 25kg / min, and vertically falling at an initial speed of 0.1m / s.

[0070] In order to more intuitively observe the movement state and interaction of the tested straw raw material particles during the operation of the auger, two stages were selected for comparative analysis: the tested straw raw material fell and just filled the storage bin 2 and was transported by the auger. The red, green and white areas were used to represent the pressure on the machine body, characterizing the pressure of the tested straw particles on the machine casing; the red, green and blue areas represented the pressure on the particles, characterizing the pressure between the tested straw particles. At the same time, the five-point sampling method was used to select particles in five areas on the top view of the particle factory to generate their trajectory roadmap to characterize their flow state, such as Figure 7-Figure 10 shown.

[0071] From the force diagram, whether it is before or after the storage bin 2 is filled and during the auger transportation, affected by the disturbance of the bottom auger, the compaction degree of the measured straw in the upper space of the feeding port of the feeding mechanism 3 is greater than that in the lower part, up to 1360Pa; the pressure of the measured straw particles on the inner wall of the feeding port of the feeding mechanism 3 is mainly concentrated on the inner walls on both sides, and is evenly distributed. Due to the symmetrical position, the force on the inner walls on both sides is similar, up to 2110Pa. According to the measured straw flow curves in the five selected areas, it can be seen that the measured straw will not accumulate in the storage bin 2 from falling into the storage bin 2 to being transported with the auger, which is conducive to the collection and update of the online spectrum. In summary, it is chosen to open a window on the side of the feeding port of the feeding mechanism 3 and to build a diffuse reflection light path. At the same time, in order to avoid wear on the inner wall of the feeding port of the feeding mechanism 3 when the auger rotates and interference with the spectrum collection, it is determined to open a window on the upper left side. The installation position is as follows: Figure 6 shown.

[0072] The detection mechanism 4 of this embodiment can determine the installation position according to the pressure between the straw raw materials to be tested, the pressure of the straw raw materials to be tested on the warehouse wall and the fluidity of the straw raw materials to be tested. Preferably, the detection mechanism 4 is arranged on one side above the front end of the feeding warehouse body 32. The detection mechanism 4 may also include a display screen 48, and the controller 49 is preferably a Raspberry Pi. The display screen 48 is connected to the controller 49. The Raspberry Pi is used for control and data reception. The speed of the feed motor 11 and the feed motor 31 is adjusted in combination with the data of the pressure sensor so that the density of the straw raw materials to be tested reaches the set range value, and then the light source 42 and the spectrometer 43 start to work and perform detection, and the results can be displayed on the display screen 48.

[0073] During operation, the straw raw material to be tested is fed into the feeding hopper 12, and the feeding motor 11 of the feeding mechanism 1 drives the feeding auger 14 to rotate, so that the material is pushed upward; the straw raw material to be tested falls into the storage bin 2 at the tail end of the feeding bin body 13; the four staggered pressure sensors in the storage bin 2 detect the pressure of the straw raw material to be tested on the bin wall of the storage bin 2, and the density of the straw raw material to be tested in the storage bin 2 can be obtained. When the obtained density T is within the set value range T1-T2, the feeding motor 11 and the feeding motor 31 keep the existing speed unchanged, and the current rotation speed is used. The light source 42 and the spectrometer 43 start working at a high speed, and at the same time, they start working for detection; when the density is not within the set value range, and the density T is lower than or higher than the set value, the speed of the feed motor 11 and / or the feeding motor 31 is adjusted to change the feeding and feeding speeds, thereby adjusting the density of the tested straw raw material in the storage bin 2 to be within the specified range; the feeding motor 31 of the feeding mechanism 3 drives the feeding auger 33 to rotate, and the tested straw raw material at the bottom of the storage bin 2 is transported upward, and fed to the subsequent carbonization production line for subsequent carbonization production.

[0074] The method for feeding the tested straw raw material of the biochar production line of the present invention adopts the above-mentioned feeding device for the tested straw raw material of the biochar production line to adjust the density of the tested straw raw material, and comprises the following steps:

[0075] Step S100, the feeding hopper 12 feeds the straw raw material to be tested, and the feeding mechanism 1 transports the straw raw material to the storage bin 2;

[0076] Step S200, the feeding mechanism 3 transports the tested straw raw material at the bottom of the storage bin 2 to the subsequent carbonization production line;

[0077] Step S300: After the straw material to be tested arrives at the storage bin 2, a plurality of pressure sensors distributed in the storage bin 2 measure the pressure of the straw material to be tested on the wall of the storage bin 2 and send the pressure to the controller 49, and the controller 49 calculates and obtains the density of the straw material to be tested;

[0078] Step S400: if the density of the straw raw material to be tested is within the set value, the feeding mechanism 1 and the feeding mechanism 3 operate at the current speed, and the controller 49 controls the light source 42 and the spectrometer 43 to start working for detection; and

[0079] Step S500: If the density of the straw material to be tested is lower or higher than the set value, the controller 49 adjusts the conveying speed of the feeding mechanism 1 and / or the feeding mechanism 3 accordingly to keep the density of the straw material to be tested in the storage bin 2 within the set range.

[0080] In step S500, when the controller 49 adjusts the conveying speed of the feeding mechanism 1 and / or the feeding mechanism 3, the relationship between the data collected by the pressure sensor and the motor speed of the feeding mechanism 1 and the feeding mechanism 3 is as follows:

[0081] When T is lower than the set value range T1-T2:

[0082] N1=δ×(T1-β×(α1P1+α2P2+α3P3+α4P4))+N;

[0083] N2=δ×(β×(α1P1+α2P2+α3P3+α4P4)-T1)+N;

[0084] When T is higher than the set value range T1-T2:

[0085] N1=δ×(T2-β×(α1P1+α2P2+α3P3+α4P4))+N;

[0086] N2=δ×(β×(α1P1+α2P2+α3P3+α4P4)-T2)+N;

[0087] Among them, T is the real-time density of the straw raw material measured in the storage bin 2, T1 is the minimum setting value of the density, T2 is the maximum setting value of the density, P1 is the pressure value measured by the first pressure sensor 44 on the side wall of the storage bin 2, P2 is the pressure value measured by the second pressure sensor 45, P3 is the pressure value measured by the third pressure sensor 46, and P4 is the pressure value measured by the fourth pressure sensor 47; β is the relationship coefficient between the pressure and density of the pressure sensor under the measured straw of different plants obtained in the experiment, α1 is the weight of the data measured by the first pressure sensor 44, α2 is the weight of the data measured by the second pressure sensor 45, α3 is the weight of the data measured by the third pressure sensor 46, α4 is the weight of the data measured by the fourth pressure sensor 47, δ is the coefficient of the difference between the motor speed and the density; N1 is the real-time speed of the feeding motor 11, N2 is the real-time speed of the feeding motor 31, and N is the difference between the feeding motor 11 and the feeding motor 31. The same speed under the condition of .

[0088] The present invention forms a stacking silo through two pipes, namely a feed silo body 13 and a feeding silo body 32, and autonomously adjusts the feeding speed of the two pipes according to the silo wall pressure at the stacking place to increase the stacking density of the tested straw. At the same time, the setting position of the detection mechanism 4 is determined according to the pressure between the tested straws, the pressure of the tested straw on the silo wall, and the fluidity of the tested straw, which effectively solves the problem of high noise generated by low density of the existing online detection of biochar feeding of the tested straw. The stacking density of the tested straw raw material is increased by self-adjustment, thereby realizing low-noise and high-precision detection of the tested straw raw material on the production line.

[0089] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A device for feeding straw raw materials to a biochar production line, characterized in that: include: The feeding mechanism comprises a feeding hopper, a feeding bin body and a feeding pushing component, wherein the feeding hopper is arranged at the front part of the feeding bin body, and the feeding pushing component is arranged in the feeding bin body; A material storage bin, the head end of which is connected to the tail end of the feeding mechanism; A feeding mechanism, the front end of which is connected to the rear end of the storage bin; the feeding mechanism comprises a feeding bin body and a feeding pushing component, and the feeding pushing component is installed in the feeding bin body; as well as The detection mechanism includes a shell, a light source, a spectrometer, a plurality of pressure sensors and a controller, wherein the light source, the spectrometer and the controller are respectively installed in the shell, and the plurality of pressure sensors are respectively arranged in the storage bin; the light source, the spectrometer and the plurality of pressure sensors are respectively connected to the controller; the controller is respectively connected to the feed pushing component and the feed pushing component; the controller adjusts the feed speed and / or the feed speed according to the pressure of the tested straw raw material on the bin wall, so that the density of the tested straw raw material is within the set value.

2. The device for feeding the tested straw raw material of the biochar production line according to claim 1, characterized in that: The feeding silo body and the feeding silo body are both tubular structures, and the tube walls of the feeding silo body and the feeding silo body are parallel to each other and are inclined at an angle of 45° to the horizontal plane.

3. The device for feeding the tested straw raw material of the biochar production line according to claim 2, characterized in that: The feed pushing component includes a feed motor and a feed auger, the feed motor is installed at the front end of the feed bin body and is connected to the feed auger; the feed auger is installed in the feed bin body, and the feed auger is coaxially arranged with the feed bin body; the feed motor drives the feed auger to rotate and push the measured straw raw material to the storage bin.

4. The device for feeding the tested straw raw material of the biochar production line according to claim 3, characterized in that: The feeding hopper is installed just above the tube wall opening of the feeding silo body.

5. The device for feeding the tested straw raw material of the biochar production line according to claim 2, characterized in that: The feeding and pushing component includes a feeding motor and a feeding auger, the feeding motor is installed at the front end of the feeding bin body and is connected to the feeding auger; the feeding auger is installed in the feeding bin body, and the feeding auger is coaxially arranged with the feeding bin body; the end of the feeding bin body is connected to the carbonization production line, and the feeding motor drives the feeding auger to rotate and push the measured straw raw material to the carbonization production line.

6. The device for feeding the tested straw raw material of the biochar production line according to claim 1, characterized in that: The detection mechanism determines the installation position according to the pressure between the detected straw raw materials, the pressure of the detected straw raw materials on the warehouse wall and the fluidity of the detected straw raw materials.

7. The device for feeding the tested straw raw material of the biochar production line according to claim 6, characterized in that: The detection mechanism is arranged on one side above the front end of the feeding bin body.

8. The device for feeding the tested straw raw material of the biochar production line according to claim 1, characterized in that: The detection mechanism also includes a display screen, the controller is a Raspberry Pi, and the display screen is connected to the controller.

9. A method for feeding the tested straw raw material to a biochar production line, characterized in that: The density of the tested straw raw material is adjusted by using the tested straw raw material feeding device of the biochar production line according to any one of claims 1 to 8, comprising the following steps: S100, feeding the tested straw raw material into a feeding hopper, and a feeding mechanism transporting the tested straw raw material into a storage bin; S200, the feeding mechanism transports the tested straw raw material at the bottom of the storage bin to the subsequent carbonization production line; S300, after the straw raw material to be tested arrives at the storage bin, a plurality of pressure sensors distributed in the storage bin measure the pressure of the straw raw material to be tested on the bin wall and send the pressure to the controller, and the controller calculates and obtains the density of the straw raw material to be tested; S400, if the density of the straw raw material to be tested is within the set value, the feeding mechanism and the feeding mechanism work at the current speed, and the controller controls the light source and the spectrometer to start working for detection; and S500: If the density of the straw material to be tested is lower than or higher than a set value, the controller adjusts the conveying speed of the feeding mechanism and / or the feeding mechanism accordingly to keep the density of the straw material to be tested in the storage bin within a set range.

10. The method for feeding the tested straw raw material to the biochar production line according to claim 9, characterized in that: In step S500, when the controller adjusts the conveying speed of the feeding mechanism and / or the feeding mechanism, the relationship between the data collected by the pressure sensor and the motor speed of the feeding mechanism and the feeding mechanism is as follows: When T is lower than the set value range T1-T2: N1=δ×(T1-β×(α1P1+α2P2+α3P3+α4P4))+N; N2=δ×(β×(α1P1+α2P2+α3P3+α4P4)-T1)+N; When T is higher than the set value range T1-T2: N1=δ×(T2-β×(α1P1+α2P2+α3P3+α4P4))+N; N2=δ×(β×(α1P1+α2P2+α3P3+α4P4)-T2)+N; Among them, T is the real-time density of the straw raw material measured in the storage bin, T1 is the minimum setting value of the density, T2 is the maximum setting value of the density, P1 is the pressure value measured by the first pressure sensor on the side wall of the storage bin, P2 is the pressure value measured by the second pressure sensor, P3 is the pressure value measured by the third pressure sensor, and P4 is the pressure value measured by the fourth pressure sensor; β is the relationship coefficient between the pressure and density of the pressure sensor under the measured straw of different plants obtained in the experiment, α1 is the weight of the data measured by the first pressure sensor, α2 is the weight of the data measured by the second pressure sensor, α3 is the weight of the data measured by the third pressure sensor, α4 is the weight of the data measured by the fourth pressure sensor, δ is the coefficient of the difference between the motor speed and the density; N1 is the real-time speed of the feeding motor, N2 is the real-time speed of the feeding motor, and N is the difference between the feeding motor and the feeding motor. The same speed under the condition of .

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