Material height self-adaptive constant-distance scanning device

Abstract

The invention relates to the field of material scanning equipment, in particular to a material height self-adaption constant distance scanning device which comprises a material conveyor, a control box, a near infrared spectrum scanner supporting frame and a near infrared spectrum scanner, and the feeding end of the material conveyor is provided with a material distance sensor used for detecting the material height; the near-infrared spectrum scanner supporting frame is arranged on the material conveyor behind the material distance sensor, a height self-adaptive adjusting device is arranged on the near-infrared spectrum scanner supporting frame, and the near-infrared spectrum scanner is arranged on the near-infrared spectrum scanner supporting frame in a height-adjustable mode through the height self-adaptive adjusting device; the material conveyor, the near infrared spectrum scanner, the material distance sensor and the height self-adaptive adjusting device are all connected with the control box.

Description

Technical Field

[0001] This invention relates to the field of material scanning equipment, and more specifically, to a material height adaptive constant distance scanning device and its scanning method. Background Technology

[0002] Near-infrared spectroscopy has been widely used for component detection in tobacco leaves due to its advantages such as speed, non-destructive nature, and environmental friendliness. This technology collects the reflectance or transmission spectra of tobacco leaves in the near-infrared band and combines them with chemometric methods to achieve quantitative or qualitative analysis of various components in tobacco leaves (such as nicotine, total sugar, and total nitrogen).

[0003] However, in practical applications, especially in continuous online detection or large-scale sample testing scenarios, the stacking height of tobacco leaf samples often varies. Currently, the common practice is to fix the near-infrared spectroscopy scanner at a preset height for detection. This fixed installation method has obvious limitations, mainly in the following aspects:

[0004] 1. The problem of tobacco leaves being too far from the scanner

[0005] When the tobacco leaves are stacked at a low height, the distance between the near-infrared spectral scanner and the surface of the tobacco leaves increases, resulting in insufficient coverage of the effective field of view and inability to fully acquire the spectral information of the tobacco leaf surface. At the same time, the intensity of the near-infrared radiation signal decreases significantly with increasing distance. Especially in environments with high humidity or obvious air stratification, the absorption of near-infrared light by components such as water vapor further weakens the signal intensity and reduces the signal-to-noise ratio. In addition, long-distance measurement is also prone to introducing background interference, such as non-target signals such as conveyor belts and ambient radiation. These interference signals can mix into the detection results, dilute or even mask the true spectral characteristics of the tobacco leaves, and affect the accuracy of component analysis.

[0006] 2. The problem of tobacco leaves being too close to the scanner

[0007] Conversely, if the tobacco leaves are stacked too high, resulting in a close distance between them and the scanner, the scanner's field of view may only cover a local area of ​​the tobacco leaves, failing to represent the overall compositional distribution of the entire batch of tobacco leaves. Since the tobacco leaves themselves are uneven in texture, thickness, and chemical composition distribution, local scanning results cannot fully reflect the true compositional content of the sample, thus causing deviations in the test results and affecting the reliability of quality assessment.

[0008] In summary, existing near-infrared detection methods with fixed heights are ill-suited to the challenges posed by variations in tobacco leaf stacking height. Excessive distance can lead to signal quality degradation and background interference, while insufficient distance can result in unrepresentative sampling. These issues severely limit the accuracy and stability of near-infrared spectroscopy in tobacco leaf component detection. Therefore, a detection scheme capable of adaptively adjusting scanning distance or field of view is urgently needed to overcome these shortcomings and improve the reliability and applicability of the detection results.

[0009] Therefore, it is necessary to propose a material height adaptive constant distance scanning device and its scanning method to solve the above problems. Summary of the Invention

[0010] To overcome at least one of the defects (deficiencies) of the prior art described above, the present invention provides a material height adaptive constant distance scanning device and its scanning method.

[0011] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: a material height adaptive constant distance scanning device, comprising a material conveyor, a control box, a near-infrared spectroscopy scanner support frame and a near-infrared spectroscopy scanner;

[0012] The material conveyor is equipped with a material distance sensor at its feed end for detecting the height of the material.

[0013] The near-infrared spectroscopy scanner support frame is mounted on the material conveyor behind the material distance sensor. The near-infrared spectroscopy scanner support frame is equipped with a height adaptive adjustment device. The near-infrared spectroscopy scanner is mounted on the near-infrared spectroscopy scanner support frame at an adjustable height via the height adaptive adjustment device.

[0014] The material conveyor, near-infrared spectroscopy scanner, material distance sensor, and height adaptive adjustment device are all connected to the control box. Since a material distance sensor is installed at the feed end of the material conveyor, it can detect the height of each piece of material passing through the conveyor. After the height is detected, the material distance sensor transmits the height information to the control box, which then adjusts the height of the height adaptive adjustment device accordingly. Because the near-infrared spectroscopy scanner is mounted on the height adaptive adjustment device, it can perform near-infrared scanning of the material at the optimal position after height adjustment. Furthermore, since the control box is also connected to the material conveyor, after the material distance sensor detects the material height, the control box can control the near-infrared spectroscopy scanner to start and perform near-infrared scanning based on the material conveyor's transmission speed, making the near-infrared scanning process more intelligent.

[0015] Furthermore, the height adaptive adjustment device includes a height adjustment mounting base, a height adjustment drive motor, a screw, a slide rail, and a slider connected to a near-infrared spectroscopy scanner;

[0016] The height adjustment mounting base is mounted on the near-infrared spectroscopy scanner support frame;

[0017] The screw is rotatably mounted on the height adjustment mounting base, and the height adjustment drive motor is mounted on the near-infrared spectroscopy scanner support frame and connected to the screw;

[0018] The slide rail is located inside the height adjustment mounting base;

[0019] The slider has a threaded hole and is mounted on the screw through the threaded hole. The bottom of the slider is sleeved on the outside of the slide rail. The screw is driven to rotate by a height adjustment drive motor, allowing the slider to move up and down along the screw. This enables the near-infrared spectroscopy scanner to adaptively adjust the height of the near-infrared scan according to the stacking height of the materials, ensuring that the near-infrared spectroscopy scanner is within the optimal near-infrared scanning distance for more accurate results. The slide rail also helps to limit the sliding of the slider, preventing it from deviating during its up and down movement.

[0020] Furthermore, it also includes a positioning mounting base, which is fixed to the near-infrared spectroscopy scanner support frame. The positioning mounting base allows the height adaptive adjustment device to be installed on the near-infrared spectroscopy scanner support frame more quickly.

[0021] Furthermore, the control box contains a control chip. The material conveyor, near-infrared spectroscopy scanner, material distance sensor, and height adjustment drive motor are all connected to the control chip. Through the settings of the control chip, the height adjustment drive motor can be controlled to make corresponding height adjustments based on the height of the material detected by the material distance sensor. This ensures that the near-infrared spectroscopy scanner is at the same distance from the object when scanning it, thus ensuring that the near-infrared spectroscopy scanner can perform near-infrared scanning on the material at the optimal distance. Since the material conveyor is also connected to the control chip, the control chip can start the near-infrared spectroscopy scanner to perform near-infrared scanning on the material after detecting its height, based on the material's moving speed.

[0022] Furthermore, the material conveyor includes a material conveying support frame, a conveyor belt, a driving roller, a driven roller, and a conveying drive servo motor connected to the control chip;

[0023] The active roller and the driven roller are rotatably mounted on both sides of the material conveying support frame, and the conveying drive servo motor is connected to the active roller.

[0024] The conveyor belt is sleeved on the outside of the driving roller and the driven roller;

[0025] The near-infrared spectroscopy scanner support frame is mounted on the material conveying support frame. The active roller and the driven roller are driven to rotate by the transmission drive servo motor, thereby driving the conveyor belt to rotate, so as to facilitate the transmission of materials.

[0026] Furthermore, it also includes a mounting bracket for the material distance sensor;

[0027] The material distance sensor mounting bracket is mounted on the material conveying support frame;

[0028] The material distance sensor is mounted on a material distance sensor mounting bracket, which allows for better installation and fixation of the material distance sensor.

[0029] Furthermore, the material transfer support frame, the material distance sensor mounting bracket, and the near-infrared spectroscopy scanner support frame are all hollow structures. The wires on the near-infrared spectroscopy scanner pass through the near-infrared spectroscopy scanner support frame and the material transfer support frame before connecting to the control chip in the control box. Similarly, the wires on the material distance sensor pass through the material distance sensor mounting bracket and the material transfer support frame before connecting to the control chip in the control box. Because the material transfer support frame, the material distance sensor mounting bracket, and the near-infrared spectroscopy scanner support frame are all hollow structures, it is convenient to route the wiring of the near-infrared spectroscopy scanner and the material distance sensor, making the structure of the material height adaptive constant distance scanning device neater.

[0030] Furthermore, the material transfer support frame is equipped with a protective net on its outer side, and an anti-slip pad or casters on its bottom. The material distance sensor is a material laser distance sensor or a material ultrasonic distance sensor. The protective net isolates and protects the near-infrared spectroscopy scanner and the material distance sensor. The anti-slip pad increases the friction between the bottom of the material transfer support frame and the ground, preventing the support frame from moving during operation. The casters facilitate easier movement of the material transfer support frame during transport. This is simple and convenient. In practical applications, other types of material distance sensors can be used as alternatives, all of which are readily conceived by those skilled in the art.

[0031] Furthermore, it also includes a fixed-height detector, a first fixed-height detection sensor, and multiple second fixed-height detection sensors;

[0032] The conveyor belt is provided with positioning mark lines and positioning interval lines for placing materials, and the first fixed height detection sensor is set at the center of the positioning mark line of the conveyor belt.

[0033] Multiple second height detection sensors are evenly arranged between the positioning interval lines at the edge of the conveyor belt;

[0034] The height detector is mounted on the material distance sensor mounting bracket, and the height detector detects the height position of the first height detection sensor and multiple second height detection sensors respectively;

[0035] The positioning mark line and the positioning interval line for placing materials are at least 1 meter apart. By setting up a height detector, a first height detection sensor, and multiple second height detection sensors, the deformation of the conveyor belt can be measured. This avoids misjudging the stacking height of the tobacco leaves due to the deformation of the conveyor belt caused by the pressure of heavy tobacco leaves on the soft conveyor belt, which would lead to inaccurate judgment of the stacking height of the tobacco leaves and affect the grading data of the tobacco leaves. Furthermore, keeping the positioning mark line and the positioning interval line for placing materials at least 1 meter apart can reduce the impact of slight deformation of the conveyor belt caused by placing materials on the height of the positioning mark line.

[0036] This invention also discloses a scanning method for a material height adaptive constant distance scanning device, comprising the following steps:

[0037] Step 1: Set the material distance sensor on the material distance sensor mounting bracket, set the height adaptive adjustment device on the near-infrared spectroscopy scanner support frame, and interconnect the material distance sensor and the height adaptive adjustment device;

[0038] Step 2: The material conveyor operates under no-load conditions. The fixed height detector detects the height value of the first fixed height detection sensor to obtain the height measurement parameters of the first fixed height detection sensor under no-load conditions.

[0039] Step 3: The material conveyor operates under no-load conditions. The fixed height detector detects the height values ​​of multiple second fixed height detection sensors and takes the average height value of the multiple second fixed height detection sensors as the height measurement parameter of the second fixed height detection sensors under no-load conditions.

[0040] Step 4: Compare the height value of the first fixed height detection sensor with the height values ​​of multiple second fixed height detection sensors under no-load conditions to obtain the initial height difference S1 between the two.

[0041] Step 5: Place the tobacco leaves on the conveyor belt between the positioning interval lines, run the material conveyor, and let the tobacco leaves pass through the material distance sensor and the near-infrared spectral scanner in sequence. The material distance sensor automatically adjusts the height of the near-infrared spectral scanner according to the stacking height of the tobacco leaves, so that the near-infrared spectral scanner keeps the tobacco leaves of different stacking heights at the same height for near-infrared scanning.

[0042] Step 6: When the fixed height detector is loaded with tobacco leaves, it detects the height value of the first fixed height detection sensor to obtain the height measurement parameters of the first fixed height detection sensor when the tobacco leaves are loaded.

[0043] Step 7: When the fixed height detector is loaded with tobacco leaves, it detects the height values ​​of multiple second fixed height detection sensors and takes the average height value of the multiple second fixed height detection sensors as the height measurement parameter of the second fixed height detection sensors when the tobacco leaves are loaded.

[0044] Step 8: Compare the height value of the first fixed height detection sensor with the height values ​​of multiple second fixed height detection sensors when the tobacco leaves are loaded, and obtain the height difference S2 between the two under the condition of the tobacco leaves being loaded.

[0045] Step 9: Accurately calculate the stacking height of the tobacco leaves based on the height adjustment distance of the near-infrared spectroscopy scanner and the height difference between S1 and S2.

[0046] Step 10: Based on the deformation of the tobacco leaves before and after the load is applied to the conveyor belt, make a preliminary estimate of the weight of the tobacco leaves between the positioning interval lines.

[0047] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0048] The material height adaptive constant distance scanning device disclosed in this invention features a material distance sensor at the feed end of the material conveyor. This sensor detects the height of each piece of material passing through the conveyor and transmits this information to the control box. The control box then adjusts the height of the adaptive height adjustment device based on this information. Since the near-infrared spectroscopy scanner is mounted on the height adjustment device, it can perform near-infrared scanning on the material at the optimal position after height adjustment. Furthermore, because the control box is also connected to the material conveyor, after the material distance sensor detects the material height, the control box can control the near-infrared spectroscopy scanner to start and perform near-infrared scanning based on the conveyor's transmission speed, making near-infrared scanning of the material more intelligent. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the material height adaptive constant distance scanning device in this invention.

[0050] Figure 2 This is a structural schematic diagram of the material height adaptive constant distance scanning device in this invention from another angle.

[0051] Figure 3 This is a schematic diagram of the height adaptive adjustment device in this invention.

[0052] Figure 4 This is a schematic diagram of the height adaptive adjustment device from another angle in this invention.

[0053] Figure 5 This is a schematic diagram of the material conveyor in this invention.

[0054] Figure 6 This is a schematic diagram of the structure of the second type of material height adaptive constant distance scanning device in this invention.

[0055] In the diagram, 1 is the material conveyor, 2 is the control box, 3 is the near-infrared spectroscopy scanner support frame, 4 is the near-infrared spectroscopy scanner, 5 is the material distance sensor, 6 is the height adaptive adjustment device, 7 is the height adjustment mounting base, 8 is the height adjustment drive motor, 9 is the screw, 10 is the slide rail, 11 is the slider, 12 is the threaded hole, 13 is the positioning mounting base, 14 is the control chip, 15 is the material conveying support frame, 16 is the conveyor belt, 17 is the driving roller, 18 is the driven roller, 19 is the conveying drive servo motor, 20 is the material distance sensor fixing bracket, 21 is the anti-slip pad, 22 is the height-fixed detector, 23 is the first height-fixed detection sensor, 24 is the second height-fixed detection sensor, 25 is the positioning mark line, and 26 is the positioning interval line. Detailed Implementation

[0056] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The technical solution of this invention will be further described below with reference to the accompanying drawings and embodiments.

[0058] like Figure 1-2 As shown, a material height adaptive constant distance scanning device includes a material conveyor 1, a control box 2, a near-infrared spectroscopy scanner support frame 3, and a near-infrared spectroscopy scanner 4. The material conveyor 1 has a material distance sensor 5 at its feed end for detecting the material height. The near-infrared spectroscopy scanner support frame 3 is mounted on the material conveyor 1 behind the material distance sensor 5. The near-infrared spectroscopy scanner support frame 3 is equipped with a height adaptive adjustment device 6. The near-infrared spectroscopy scanner 4 is height-adjustable on the near-infrared spectroscopy scanner support frame 3 via the height adaptive adjustment device 6. The material conveyor 1, near-infrared spectroscopy scanner 4, material distance sensor 5, and height adaptive adjustment device 6 are all connected to the control box 2. Because the material distance sensor 5 is located at the feed end of the material conveyor 1, the material distance sensor 5 can... The height of each material passing through the material conveyor 1 is detected. After the height of the material is detected, the material distance sensor 5 transmits the height information to the control box 2. The control box 2 then adjusts the height of the height adaptive adjustment device 6 according to the height information. Since the near-infrared spectral scanner 4 is installed on the height adaptive adjustment device 6, the near-infrared spectral scanner 4 can perform near-infrared scanning of the material at the optimal position after the height is adjusted. In addition, since the control box 2 is also connected to the material conveyor 1, after the material distance sensor 5 detects the height of the material, the control box 2 can control the near-infrared spectral scanner 4 to start and perform near-infrared scanning of the material according to the transmission speed of the material conveyor 1, making the near-infrared scanning of the item more intelligent.

[0059] like Figure 3-4As shown, the height adaptive adjustment device 6 includes a height adjustment mounting base 7, a height adjustment drive motor 8, a screw 9, a slide rail 10, and a slider 11 connected to the near-infrared spectroscopy scanner 4. The height adjustment mounting base 7 is mounted on the near-infrared spectroscopy scanner support frame 3. The screw 9 is rotatably mounted on the height adjustment mounting base 7, and the height adjustment drive motor 8 is mounted on the near-infrared spectroscopy scanner support frame 3 and connected to the screw 9. The slide rail 10 is located inside the height adjustment mounting base 7. The slider 11 has a threaded hole 12, and the slider 11 is mounted on the screw 9 through the threaded hole 12. The bottom of the slider 11 is sleeved on the outside of the slide rail 10. The height adjustment drive motor 8 drives the screw 9 to rotate, allowing the slider 11 to move along the screw 9. The near-infrared spectroscopy scanner 4 moves up and down, allowing it to adaptively adjust its height during near-infrared scanning based on the stacking height of the materials. This ensures that the scanner is within the optimal near-infrared scanning distance, resulting in more accurate scans. The slide rail 10 limits the sliding of the slider 11, preventing it from shifting during vertical movement. The invention also includes a positioning mounting base 13, which fixes the height adjustment mounting base 7 to the near-infrared spectroscopy scanner support frame 3. The positioning mounting base 13 allows for faster installation of the height adaptive adjustment device 6 on the near-infrared spectroscopy scanner support frame 3.

[0060] In this invention, a control chip 14 is provided in the control box 2. The material conveyor 1, near-infrared spectral scanner 4, material distance sensor 5, and height adjustment drive motor 8 are all connected to the control chip 14. Through the settings of the control chip 14, the height adjustment drive motor 8 can be controlled to perform corresponding height adjustment based on the height of the material detected by the material distance sensor 5. This ensures that the near-infrared spectral scanner 4 is at the same distance from the material when scanning it, thus ensuring that the near-infrared spectral scanner 4 can perform near-infrared scanning of the material at the optimal distance. Since the material conveyor 1 is also connected to the control chip 14, the control chip 14 can start the near-infrared spectral scanner 4 to perform near-infrared scanning of the material after detecting its height, based on the material's moving speed.

[0061] like Figure 5As shown, the material conveyor 1 includes a material conveying support frame 15, a conveyor belt 16, a drive roller 17, a driven roller 18, and a transmission drive servo motor 19 connected to the control chip 14. The drive roller 17 and the driven roller 18 are rotatably mounted on both sides of the material conveying support frame 15, and the transmission drive servo motor 19 is connected to the drive roller 17. The conveyor belt 16 is sleeved on the outside of the drive roller 17 and the driven roller 18. The near-infrared spectroscopy scanner support frame 3 is mounted on the material conveying support frame 15. The transmission drive servo motor 19 drives the drive roller 17 and the driven roller 18 to rotate, thereby driving the conveyor belt 16 to rotate, so as to facilitate the transfer of materials.

[0062] In addition, it also includes a material distance sensor fixing bracket 20; the material distance sensor fixing bracket 20 is set on the material conveying support frame 15; the material distance sensor 5 is set on the material distance sensor fixing bracket 20. The setting of the material distance sensor fixing bracket 20 can better install and fix the material distance sensor 5. In this invention, the material conveying support frame 15, the material distance sensor fixing bracket 20 and the near-infrared spectroscopy scanner support frame 3 are all hollow structures. The wires on the near-infrared spectroscopy scanner 4 pass through the near-infrared spectroscopy scanner support frame 3 and the material conveying support frame 15 and are connected to the control chip 14 in the control box 2. The wires on the material distance sensor 5 pass through the material distance sensor fixing bracket 20 and the material conveying support frame 15 and are connected to the control chip 14 in the control box 2. Since the material conveying support frame 15, the material distance sensor fixing bracket 20 and the near-infrared spectroscopy scanner support frame 3 are all hollow structures, it is convenient to route the wires of the near-infrared spectroscopy scanner 4 and the material distance sensor 5, making the structure of the material height adaptive constant distance scanning device neater.

[0063] In this invention, a protective net (not shown in the drawings) is provided on the outside of the material transfer support frame 15. The protective net can isolate and protect the near-infrared spectral scanner 4 and the material distance sensor 5. An anti-slip pad 21 or casters (not shown in the drawings) are provided at the bottom of the material transfer support frame 15. The anti-slip pad 21 increases the friction between the bottom of the material transfer support frame 15 and the ground, preventing the material transfer support frame 15 from moving during operation. The casters facilitate the movement of the material transfer support frame 15 during handling, which is simple and convenient. In this invention, the material distance sensor 5 is a material laser distance sensor or a material ultrasonic distance sensor. In practical applications, other types of material distance sensors 5 can also be used as substitutes, all of which are alternatives that are easily conceived by those skilled in the art.

[0064] like Figure 6As shown, this invention also includes a height detector 22, a first height detection sensor 23, and multiple second height detection sensors 24; the conveyor belt 16 is provided with positioning mark lines 25 and positioning interval lines 26 for placing materials; the first height detection sensor 23 is located at the center of the positioning mark line 25 of the conveyor belt; multiple second height detection sensors 24 are evenly arranged between the positioning interval lines 26 at the edge of the conveyor belt 16; the height detector 22 is mounted on the material distance sensor fixing bracket 20, and the height detector 22 detects the height positions of the first height detection sensor 23 and the multiple second height detection sensors 24 respectively; the positioning mark line 25 and the positioning interval lines 26 for placing materials are provided on the material distance sensor fixing bracket 20. The positioning interval lines 26 of the material are at least 1 meter apart. By setting up the height detector 22, the first height detection sensor 23 and multiple second height detection sensors 24, the deformation of the conveyor belt 16 can be measured. This can avoid the deformation of the conveyor belt 16 caused by the heavy tobacco leaves pressing down on it, which would lead to misjudgment of the stacking height of the tobacco leaves and thus affect the grading data of the tobacco leaves. By keeping the positioning mark line 25 at least 1 meter apart from the positioning interval line 26 used for placing materials, the influence of slight deformation of the conveyor belt 16 caused by placing materials on the height of the positioning mark line 25 can be reduced.

[0065] This invention also discloses a scanning method for a material height adaptive constant distance scanning device, comprising the following steps:

[0066] Step 1: Set the material distance sensor on the material distance sensor mounting bracket, set the height adaptive adjustment device on the near-infrared spectroscopy scanner support frame, and interconnect the material distance sensor and the height adaptive adjustment device;

[0067] Step 2: The material conveyor operates under no-load conditions. The fixed height detector detects the height value of the first fixed height detection sensor to obtain the height measurement parameters of the first fixed height detection sensor under no-load conditions.

[0068] Step 3: The material conveyor operates under no-load conditions. The fixed height detector detects the height values ​​of multiple second fixed height detection sensors and takes the average height value of the multiple second fixed height detection sensors as the height measurement parameter of the second fixed height detection sensors under no-load conditions.

[0069] Step 4: Compare the height value of the first fixed height detection sensor with the height values ​​of multiple second fixed height detection sensors under no-load conditions to obtain the initial height difference S1 between the two.

[0070] Step 5: Place the tobacco leaves on the conveyor belt between the positioning interval lines, run the material conveyor, and let the tobacco leaves pass through the material distance sensor and the near-infrared spectral scanner in sequence. The material distance sensor automatically adjusts the height of the near-infrared spectral scanner according to the stacking height of the tobacco leaves, so that the near-infrared spectral scanner keeps the tobacco leaves of different stacking heights at the same height for near-infrared scanning.

[0071] Step 6: When the fixed height detector is loaded with tobacco leaves, it detects the height value of the first fixed height detection sensor to obtain the height measurement parameters of the first fixed height detection sensor when the tobacco leaves are loaded.

[0072] Step 7: When the fixed height detector is loaded with tobacco leaves, it detects the height values ​​of multiple second fixed height detection sensors and takes the average height value of the multiple second fixed height detection sensors as the height measurement parameter of the second fixed height detection sensors when the tobacco leaves are loaded.

[0073] Step 8: Compare the height value of the first fixed height detection sensor with the height values ​​of multiple second fixed height detection sensors when the tobacco leaves are loaded, and obtain the height difference S2 between the two under the condition of the tobacco leaves being loaded.

[0074] Step 9: Accurately calculate the stacking height of the tobacco leaves based on the height adjustment distance of the near-infrared spectroscopy scanner and the height difference between S1 and S2.

[0075] Step 10: Based on the deformation of the tobacco leaves before and after the load is applied to the conveyor belt, make a preliminary estimate of the weight of the tobacco leaves between the positioning interval lines.

[0076] Example

[0077] In this embodiment, when transporting and near-infrared detecting tobacco leaves are required, the stacked tobacco leaves are placed on a conveyor belt. The control chip in the control box controls the transmission drive servo motor to rotate, thereby transporting the stacked tobacco leaves. Since a material distance sensor fixing bracket is provided at the feeding end of the material conveyor, and a material distance sensor is provided on the material distance sensor fixing bracket, the material distance sensor can detect the stacking height of the tobacco leaves and transmit the data of the tobacco leaf stacking to the control chip. At this time, the control chip controls the height adjustment drive motor to rotate, thereby adjusting the height of the near-infrared spectral scanner, so that the near-infrared spectral scanner can be within the optimal near-infrared scanning distance during near-infrared scanning, so that the near-infrared scanning results are more accurate. In addition, since the material conveyor is also connected to the control chip, the control chip can start the near-infrared spectral scanner to perform near-infrared scanning on the material that has moved into place according to the moving speed of the material after detecting the height of the material. This makes the material height adaptive constant distance scanning device more intelligent when performing near-infrared scanning of tobacco leaves.

[0078] The positional relationships described in the figures are for illustrative purposes only and should not be construed as limiting this patent. Clearly, the above embodiments of the present invention are merely examples to clearly illustrate the invention and are not intended to limit the implementation of the invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of this invention.

Claims

1. A material height adaptive constant distance scanning device, comprising a material conveyor, a control box, a near-infrared spectroscopy scanner support frame, and a near-infrared spectroscopy scanner, characterized in that: The material conveyor is equipped with a material distance sensor at its feed end for detecting the height of the material. The near-infrared spectroscopy scanner support frame is mounted on the material conveyor behind the material distance sensor. The near-infrared spectroscopy scanner support frame is equipped with a height adaptive adjustment device. The near-infrared spectroscopy scanner is mounted on the near-infrared spectroscopy scanner support frame at an adjustable height via the height adaptive adjustment device. The material conveyor, near-infrared spectroscopy scanner, material distance sensor, and height adaptive adjustment device are all connected to the control box.

2. The material height adaptive constant distance scanning device according to claim 1, characterized in that: The height adaptive adjustment device includes a height adjustment mounting base, a height adjustment drive motor, a screw, a slide rail, and a slider connected to a near-infrared spectroscopy scanner; The height adjustment mounting base is mounted on the near-infrared spectroscopy scanner support frame; The screw is rotatably mounted on the height adjustment mounting base, and the height adjustment drive motor is mounted on the near-infrared spectroscopy scanner support frame and connected to the screw; The slide rail is located inside the height adjustment mounting base; The slider is provided with a threaded hole, and the slider is mounted on the screw through the threaded hole. The bottom of the slider is sleeved on the outside of the slide rail.

3. The material height adaptive constant distance scanning device according to claim 2, characterized in that: It also includes a positioning mounting base, the height-adjustable mounting base being fixed to the near-infrared spectroscopy scanner support frame via the positioning mounting base.

4. The material height adaptive constant distance scanning device according to claim 2, characterized in that: The control box contains a control chip, and the material conveyor, near-infrared spectroscopy scanner, material distance sensor, and height adjustment drive motor are all connected to the control chip.

5. The material height adaptive constant distance scanning device according to claim 4, characterized in that: The material conveyor includes a material conveying support frame, a conveyor belt, a driving roller, a driven roller, and a conveying drive servo motor connected to a control chip; The active roller and the driven roller are rotatably mounted on both sides of the material conveying support frame, and the conveying drive servo motor is connected to the active roller. The conveyor belt is sleeved on the outside of the driving roller and the driven roller; The near-infrared spectroscopy scanner support frame is mounted on the material transfer support frame.

6. The material height adaptive constant distance scanning device according to claim 5, characterized in that: It also includes a mounting bracket for the material distance sensor; The material distance sensor mounting bracket is mounted on the material conveying support frame; The material distance sensor is mounted on a material distance sensor mounting bracket.

7. The material height adaptive constant distance scanning device according to claim 6, characterized in that: The material conveying support frame, the material distance sensor fixing bracket, and the near-infrared spectroscopy scanner support frame are all hollow structures. The wires on the near-infrared spectroscopy scanner pass through the near-infrared spectroscopy scanner support frame and the material conveying support frame and are connected to the control chip in the control box. The wires on the material distance sensor pass through the material distance sensor fixing bracket and the material conveying support frame and are connected to the control chip in the control box.

8. The material height adaptive constant distance scanning device according to claim 5, characterized in that: The material conveying support frame is equipped with a protective net on its outer side, and the bottom of the material conveying support frame is equipped with an anti-slip pad or casters. The material distance sensor is a material laser distance sensor or a material ultrasonic distance sensor.

9. The material height adaptive constant distance scanning device according to claim 6, characterized in that: It also includes a fixed-height detector, a first fixed-height detection sensor, and multiple second fixed-height detection sensors; The conveyor belt is provided with positioning mark lines and positioning interval lines for placing materials, and the first fixed height detection sensor is set at the center of the positioning mark line of the conveyor belt. Multiple second height detection sensors are evenly arranged between the positioning interval lines at the edge of the conveyor belt; The height detector is mounted on the material distance sensor mounting bracket, and the height detector detects the height position of the first height detection sensor and multiple second height detection sensors respectively; The positioning mark line and the positioning interval line for placing materials are at least 1 meter apart.

10. A scanning method for a material height adaptive constant distance scanning device, characterized in that: Includes the following steps: Step 1: Set the material distance sensor on the material distance sensor mounting bracket, set the height adaptive adjustment device on the near-infrared spectroscopy scanner support frame, and interconnect the material distance sensor and the height adaptive adjustment device; Step 2: The material conveyor operates under no-load conditions. The fixed height detector detects the height value of the first fixed height detection sensor to obtain the height measurement parameters of the first fixed height detection sensor under no-load conditions. Step 3: The material conveyor operates under no-load conditions. The fixed height detector detects the height values ​​of multiple second fixed height detection sensors and takes the average height value of the multiple second fixed height detection sensors as the height measurement parameter of the second fixed height detection sensors under no-load conditions. Step 4: Compare the height value of the first fixed height detection sensor with the height values ​​of multiple second fixed height detection sensors under no-load conditions to obtain the initial height difference S1 between the two. Step 5: Place the tobacco leaves on the conveyor belt between the positioning interval lines, run the material conveyor, and let the tobacco leaves pass through the material distance sensor and the near-infrared spectral scanner in sequence. The material distance sensor automatically adjusts the height of the near-infrared spectral scanner according to the stacking height of the tobacco leaves, so that the near-infrared spectral scanner keeps the tobacco leaves of different stacking heights at the same height for near-infrared scanning. Step 6: When the fixed height detector is loaded with tobacco leaves, it detects the height value of the first fixed height detection sensor to obtain the height measurement parameters of the first fixed height detection sensor when the tobacco leaves are loaded. Step 7: When the fixed height detector is loaded with tobacco leaves, it detects the height values ​​of multiple second fixed height detection sensors and takes the average height value of the multiple second fixed height detection sensors as the height measurement parameter of the second fixed height detection sensors when the tobacco leaves are loaded. Step 8: Compare the height value of the first fixed height detection sensor with the height values ​​of multiple second fixed height detection sensors when the tobacco leaves are loaded, and obtain the height difference S2 between the two under the condition of the tobacco leaves being loaded. Step 9: Accurately calculate the stacking height of the tobacco leaves based on the height adjustment distance of the near-infrared spectroscopy scanner and the height difference between S1 and S2. Step 10: Based on the deformation of the tobacco leaves before and after the load is applied to the conveyor belt, make a preliminary estimate of the weight of the tobacco leaves between the positioning interval lines.

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