Portable moisture detection equipment for Enshi Yulu de-enzyming process

Abstract

The invention discloses portable moisture detection equipment for Enshi Yulu de-enzyming procedure, which comprises a steam de-enzyming box main body, a detection frame, a rotary material taking and placing mechanism, a steam discharge mechanism, a detection mechanism and a push limiting mechanism, electric telescopic rods are symmetrically and fixedly arranged on the detection frame, and a lifting frame is fixedly arranged at the telescopic ends of the electric telescopic rods; a motor is fixedly arranged in the middle of the top of the lifting frame; cover plates are symmetrically and fixedly arranged below the rotating disc; a storage net cage is fixedly connected below the cover plates in a matched manner; a steam discharge mechanism is arranged on the rotating disc, a detection mechanism is arranged in the middle of the detection frame, and a push limiting mechanism is arranged at the bottom of the detection frame; according to the invention, the functions of steam fixation, rapid cooling and near infrared moisture detection are integrated, the turntable type double-station design is utilized, cooling and nondestructive testing of treated tea leaves are synchronously completed in a single fixation period, and the physical state of the fixation leaves is accurately controlled through pressure control by a one-way valve and forced air cooling by a fan and an opening and closing valve.

Description

Technical Field

[0001] The present invention relates to the technical field of tea moisture detection equipment, in particular to a portable moisture detection equipment for an Enshi Yulu tea fixing process. Background Art

[0002] Green tea is produced from the new buds of the tea plant through a series of steps, including withering, shaping, and drying. Among these steps, withering is a crucial step in green tea processing. This involves using high temperatures to inactivate the polyphenol oxidase enzyme in fresh tea leaves, accompanied by water loss. During the withering stage, the approximately 75% water content in the fresh leaves rapidly decreases under high temperatures, inactivating polyphenol oxidase and preventing the oxidation of phenolic compounds. In green tea production, the degree of withering significantly influences the tea's flavor, which is related to the tea's moisture content. In green tea processing, a tea sample's moisture content is generally between 58-62% for moderate withering, below 58% for under withering, and above 62% for over withering. Under withering results in high moisture content, and residual polyphenol oxidase contributes to the oxidation of phenolic compounds, resulting in red stems and leaves, reducing the quality of the finished sample. Conversely, over withering results in too low a moisture content, making it difficult to shape the leaves during the subsequent rolling process. Therefore, assessing the degree of withering is crucial for maintaining tea quality. In industrial production, tea makers usually determine the degree of withering based on the moisture content of the tea leaves, which is a labor-intensive and inaccurate evaluation method. In recent years, tea entrepreneurs have urgently needed an accurate, fast, non-destructive, and online tea moisture detection method to optimize processing measures and stabilize green tea product quality.

[0003] The traditional method for measuring tea moisture is by drying and weighing. This method offers high measurement accuracy, but is time-consuming and lossy, failing to meet the requirements for online, rapid, and non-destructive testing during tea processing. Manual, empirical methods, often based on expert analysis, can easily lead to red edges, burnt leaves, or incomplete tea removal in finished products, resulting in unstable quality and waste of fresh tea leaves. Therefore, the present invention proposes a portable moisture detection device for the Enshi Yu Lu tea fixation process to address these existing issues. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to propose a portable moisture detection equipment for the withering process of Enshi Yu Lu. The portable moisture detection equipment for the withering process of Enshi Yu Lu integrates steam withering, rapid cooling and near-infrared moisture detection functions into one, realizing the automated continuous operation of the whole process of withering-cooling-detection. The turntable double-station design is utilized to simultaneously complete the cooling and non-destructive testing of the processed tea leaves within a single withering cycle, solving the problem that the traditional tea moisture detection method using the drying and weighing method has a large size and is inconvenient to move. The portability of the equipment is effectively improved. The rollers under the bottom plate facilitate the rapid movement of the detection frame to adapt to the production line, making the device quickly compatible with different production lines, effectively improving the portability and production line compatibility of the detection device. The physical state of the withered leaves is accurately controlled by the one-way valve pressure control and the fan and the opening and closing valve forced air cooling, combined with the near-infrared spectrometer and whiteboard in a constant temperature environment for real-time calibration.

[0005] To achieve the objectives of the present invention, the present invention is implemented through the following technical solutions: A portable moisture detection device for the Enshi Yu Lu withering process, comprising a steam withering box main body, a detection frame, a rotating material taking and discharging mechanism, a steam exhaust mechanism, a detection mechanism and a push-limiting mechanism, the rotating material taking and discharging mechanism comprising an electric telescopic rod, a lifting frame, a turntable, a motor, a cover plate and a material storage net box, the electric telescopic rod is symmetrically fixed on the detection frame, the lifting frame is fixed on the telescopic end of the electric telescopic rod, a turntable is rotatably provided in the middle of the bottom of the lifting frame, a motor is fixed in the middle of the top of the lifting frame, the output end of the motor is drive-connected to the turntable, a cover plate is symmetrically fixed below the turntable, a material storage net box is matched and fixedly connected below the cover plate, a steam exhaust mechanism is provided on the turntable, a detection mechanism is provided in the middle of the detection frame, and a push-limiting mechanism is provided at the bottom of the detection frame.

[0006] A further improvement is that the cover plate corresponds to the upper and lower positions of the opening above the main body of the steam killing box.

[0007] Further improvements are: the steam exhaust mechanism includes a steam pipe, a one-way valve, a cooling air duct, an opening and closing valve and a fan; a steam pipe is provided on one side of the cover plate, a one-way valve is fixed on the steam pipe; a cooling air duct is provided on the other side of the cover plate, an opening and closing valve is fixed on the cooling air duct, and a fan is fixed on the cooling air duct.

[0008] Further improvements are: the detection mechanism includes a constant temperature detection box, a detection platform, a whiteboard and a portable near-infrared spectrometer, a constant temperature detection box is fixed in the middle of the detection rack, a detection platform is fixed in the middle of the lower part of the constant temperature detection box, a whiteboard is inserted and placed in the constant temperature detection box, and a portable near-infrared spectrometer is fixed on the upper side of the constant temperature detection box.

[0009] A further improvement is that the pushing and limiting mechanism includes a base plate, rollers and limiting grooves, the lower end of the detection frame is fixed with a base plate, the four corners of the bottom of the base plate are fixed with rollers, and the inner side of the detection frame is equipped with limiting grooves.

[0010] A further improvement is that the limiting groove is matched with the outer edge of the steam fixing box body to cooperate in limiting.

[0011] Further improvement is that the detection process includes the following steps:

[0012] Step 1: Equipment pretreatment: Place the whiteboard on the test bench and turn on the portable near-infrared spectrometer. Preheat the light source and calibrate the baseline using the whiteboard.

[0013] Step 2: Sample processing: take out the withered leaf samples from the storage box, spread them on the testing table and gently press them flat;

[0014] Step 3: Spectral scanning: the portable near-infrared spectrometer probe is pressed vertically downward while the light source maintains a 45° incident angle, and sub-spectra are continuously collected and averaged;

[0015] Step 4: Model prediction: Spectral data are mapped to moisture content values ​​through chemometric models.

[0016] Further improvements are: in step 2, the sample thickness is controlled at 20±2mm and the pressure is controlled at ≤300g / cm 2 .

[0017] A further improvement is that the wavelength range of the portable near-infrared spectrometer in step three is 900-1700 nm.

[0018] The beneficial effects of the present invention are as follows: the present invention integrates steam killing, rapid cooling and near-infrared moisture detection functions into one, thereby realizing the automated continuous operation of the whole process of killing-cooling-detection, and utilizing the turntable-type double-station design to simultaneously complete the cooling and non-destructive testing of the processed tea leaves in a single killing cycle, thereby solving the problem that the traditional tea moisture detection method adopts the drying and weighing method and the drying detection equipment is relatively large and inconvenient to move, thereby effectively improving the portability of the equipment, and conveniently pushing the detection frame to move quickly to adapt to the production line through the rollers under the bottom plate, facilitating the rapid compatibility of the device with different production lines, thereby effectively improving the portability and production line compatibility of the detection device, and accurately controlling the physical state of the killed leaves through the one-way valve pressure control and the fan and the opening and closing valve forced air cooling, and combining the near-infrared spectrometer and the whiteboard in a constant temperature environment for real-time calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall front sectional view of the present invention;

[0020] Figure 2A top view of the turntable of the present invention;

[0021] Figure 3 This is a flow chart of the detection steps of the detection mechanism of the present invention;

[0022] Figure 4 It is a scatter plot of the detection results of the present invention.

[0023] Among them: 1. Steam killing box body; 2. Detection frame; 3. Electric telescopic rod; 4. Lifting frame; 5. Turntable; 6. Motor; 7. Cover; 8. Storage net box; 9. Steam pipe; 10. One-way valve; 11. Cooling air duct; 12. On-off valve; 13. Fan; 14. Constant temperature detection box; 15. Testing table; 16. Whiteboard; 17. Portable near-infrared spectrometer; 18. Bottom plate; 19. Roller; 20. Limit slot. DETAILED DESCRIPTION

[0024] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0025] Example 1

[0026] according to Figure 1 、 Figure 2As shown, this embodiment provides a portable moisture detection equipment for the Enshi Yu Lu fixing process, including a steam fixing box main body 1, a detection frame 2, a rotating material taking and discharging mechanism, a steam exhaust mechanism, a detection mechanism and a push limit mechanism. The rotating material taking and discharging mechanism includes an electric telescopic rod 3, a lifting frame 4, a turntable 5, a motor 6, a cover plate 7 and a material storage net box 8. The electric telescopic rod 3 is symmetrically fixed on the detection frame 2, and the lifting frame 4 is fixed on the telescopic end of the electric telescopic rod 3. A turntable 5 is rotatably provided in the middle of the bottom of the lifting frame 4, and a motor 6 is fixed in the middle of the top of the lifting frame 4. The output end of the motor 6 is driven and connected to the turntable 5, and a cover plate 7 is symmetrically fixed below the turntable 5. The cover plate 7 corresponds to the upper and lower positions of the opening above the steam fixing box main body 1, and a material storage net box 8 is fixedly provided below the cover plate 7. When steam fixing is carried out, the detection frame 2 is pushed to move above the steam fixing box main body 1, and the electric telescopic rod 3 extends to drive the lifting frame 4 to descend so that the tea storage material corresponding to the other side below the turntable 5 is placed. The mesh box 8 enters the steam killing box body 1, and the cover plate 7 is synchronously lowered to cover the top of the steam killing box body 1 to achieve sealing. The tea killing process is realized by introducing high-temperature steam into the steam killing box body 1. After the tea is killed, the electric telescopic rod 3 retracts to drive the lifting frame 4 and the turntable 5 to rise and drive the storage mesh box 8 to move out. The motor 6 drives the turntable 5 to rotate so that another set of storage boxes is rotated to the top of the steam killing box body 1, which is convenient for moisture detection of the tea that has been killed while steam killing is being carried out. It solves the problem that the traditional tea moisture detection method uses the drying and weighing method. This method has high measurement accuracy, but has the disadvantages of being time-consuming and lossy, and cannot meet the needs of online, fast and non-destructive detection in the tea processing process. At the same time, it solves the problem that the detection equipment is relatively large and inconvenient to move, and effectively improves the portability of the equipment. A steam exhaust mechanism is provided on the turntable 5, a detection mechanism is provided in the middle of the detection frame 2, and a push limit mechanism is provided at the bottom of the detection frame 2.

[0027] The steam exhaust mechanism includes a steam pipe 9, a one-way valve, a cooling air duct 11, an opening and closing valve 12 and a fan 13. A steam pipe 9 is provided on one side of the cover plate 7, and a one-way valve is fixed on the steam pipe 9. A cooling air duct 11 is provided on the other side of the cover plate 7, and an opening and closing valve 12 is fixed on the cooling air duct 11. A fan 13 is fixed on the cooling air duct 11. When steam killing is carried out, the internal air pressure of the steam killing box body 1 continues to rise and then the one-way valve is pushed open to discharge the high-temperature steam through the steam pipe 9, so that the internal air pressure of the steam killing box body 1 remains stable during the killing process. When the killing is completed, the storage net box 8 rotates with the turntable 5 to the lower side of the detection frame 2, and then the opening and closing valve 12 and the fan 13 are opened to blow air to the tea leaves in the storage net box 8 through the cooling air duct 11 to cool the tea leaves, so that the tea leaves can be taken out for detection.

[0028] The detection mechanism includes a constant temperature detection box 14, a detection table 15, a whiteboard 16 and a portable near-infrared spectrometer 17. The constant temperature detection box 14 is fixed in the middle of the detection frame 2, the detection table 15 is fixed in the middle of the lower part of the constant temperature detection box 14, a whiteboard 16 is inserted and placed in the constant temperature detection box 14, and a portable near-infrared spectrometer 17 is fixed on the upper side of the constant temperature detection box 14. Before the detection, the whiteboard 16 is used as a reference object for the portable near-infrared spectrum detection to establish an absolute scale for optical measurement, ensuring that different equipment can output unified and reliable spectral data in the high-humidity workshop environment of Enshi Yu Lu tea.

[0029] The pushing and limiting mechanism includes a bottom plate 18, a roller 19 and a limiting groove 20. The bottom end of the detection frame 2 is fixed with a bottom plate 18, and rollers 19 are fixed at the four corners of the bottom of the bottom plate 18. A limiting groove 20 is provided on the inner side of the detection frame 2. The limiting groove 20 is matched with the outer edge of the steam killing box body 1 for limiting. Before the inspection, the detection frame 2 is pushed to move to the top of the steam killing box body 1 under the drive of the roller 19. The limiting groove 20 is stuck in the corner of the steam killing box body 1 to facilitate the rapid alignment of the material storage box 8 and prevent offset during the inspection process. The rollers under the bottom plate are used to facilitate the rapid movement of the detection frame to adapt to the production line, making it convenient for the device to be quickly compatible with different production lines, effectively improving the portability and production line compatibility of the detection device.

[0030] Example 2:

[0031] according to Figure 3 As shown, this embodiment provides a portable moisture detection device for the Enshi Yu Lu fixing process, and the detection process includes the following steps:

[0032] Step 1: Equipment pretreatment: Place the whiteboard on the test bench and turn on the portable near-infrared spectrometer. Preheat the light source and calibrate the baseline using the whiteboard.

[0033] Step 2: Sample processing: take out the withered leaf samples from the storage box, spread them on the testing table and gently press them flat;

[0034] The sample thickness is controlled at 20±2mm and the pressure is controlled at ≤300g / cm 2 .

[0035] Step 3: Spectral scanning: The portable near-infrared spectrometer probe is pressed vertically downward while the light source maintains a 45° incident angle, and sub-spectra are continuously collected and averaged.

[0036] The portable near-infrared spectrometer covers a wavelength range of 900-1700nm.

[0037] Step 4: Model prediction: Spectral data are mapped to moisture content values ​​through chemometric models.

[0038] 50 samples of Enshi Yulu were sampled and the moisture content was determined using the standard method. The predicted moisture content of the samples was obtained by spectral scanning. The data are shown in the following table and figure. It can be seen that there is a very high correlation and a very low error (R 2 =0.9976, RMSECV=0.902%), which can meet the needs of rapid and convenient detection of moisture content in fresh leaves during the fixing process.

[0039]

[0040]

[0041] The portable moisture detection equipment for the Enshi Yu Lu tea withering process first operates by pushing the rollers at the bottom of the detection frame to the top of the steam withering chamber, where it precisely engages the chamber's edges via stop slots. The electric telescopic rod then lowers the lifting frame, driving the storage cage below the turntable carrying fresh leaves into the steam withering chamber. Simultaneously, the cover descends to seal the chamber. As high-temperature steam enters, the chamber pressure continuously rises. When the set threshold is reached, a check valve on the steam pipe opens, releasing excess steam and maintaining a stable pressure during the withering process. After withering is complete, the electric telescopic rod raises the lifting frame, removing the storage cage. The motor then rotates the turntable 180°, transferring the processed tea leaves to the testing station. Simultaneously, another set of storage cages filled with fresh leaves is transferred to the withering station. In the testing station, a fan and valve in the cooling duct activate, blowing cool air onto the withered leaves for rapid cooling. The cooled tea leaves are then placed on a testing table within the constant-temperature chamber. A portable near-infrared spectrometer is calibrated against a whiteboard for non-destructive moisture testing. The entire process realizes continuous automated operations of withering, cooling and testing, significantly improving the processing efficiency of steamed green tea.

[0042] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable moisture detection device for the fixing process of Enshi Yu Lu tea, characterized by: The invention comprises a steam killing box body (1), a detection frame (2), a rotating material taking and discharging mechanism, a steam exhaust mechanism, a detection mechanism and a push-limit mechanism, wherein the rotating material taking and discharging mechanism comprises an electric telescopic rod (3), a lifting frame (4), a turntable (5), a motor (6), a cover plate (7) and a material storage net box (8), wherein the electric telescopic rod (3) is symmetrically fixed on the detection frame (2), the lifting frame (4) is fixed on the telescopic end of the electric telescopic rod (3), a turntable (5) is rotatably provided in the middle of the bottom of the lifting frame (4), a motor (6) is fixed in the middle of the top of the lifting frame (4), an output end of the motor (6) is drive-connected to the turntable (5), a cover plate (7) is symmetrically fixed below the turntable (5), a material storage net box (8) is matched and fixedly connected below the cover plate (7), a steam exhaust mechanism is provided on the turntable (5), a detection mechanism is provided in the middle of the detection frame (2), and a push-limit mechanism is provided at the bottom of the detection frame (2).

2. A portable moisture detection device for the fixing process of Enshi Yu Lu according to claim 1, characterized in that: The cover plate (7) corresponds to the upper and lower positions of the opening above the steam killing box body (1).

3. A portable moisture detection device for the fixing process of Enshi Yu Lu according to claim 1, characterized in that: The steam exhaust mechanism comprises a steam pipe (9), a one-way valve (10), a cooling air pipe (11), an on-off valve (12) and a fan (13); one side of the cover plate (7) is provided with a steam pipe (9), a one-way valve (10) is fixedly provided on the steam pipe (9); the other side of the cover plate (7) is provided with a cooling air pipe (11), an on-off valve (12) is fixedly provided on the cooling air pipe (11), and a fan (13) is fixedly provided on the cooling air pipe (11).

4. The portable moisture detection device for the fixing process of Enshi Yu Lu according to claim 1, characterized in that: The detection mechanism comprises a constant temperature detection box (14), a detection table (15), a whiteboard (16) and a portable near-infrared spectrometer (17); the constant temperature detection box (14) is fixedly provided in the middle of the detection frame (2); the detection table (15) is fixedly provided in the middle of the lower part of the constant temperature detection box (14); the whiteboard (16) is inserted and placed in the constant temperature detection box (14); and the portable near-infrared spectrometer (17) is fixedly provided on one side of the upper part of the constant temperature detection box (14).

5. The portable moisture detection device for the Enshi Yu Lu fixing process according to claim 1, characterized in that: The pushing and limiting mechanism comprises a bottom plate (18), a roller (19) and a limiting groove (20); the bottom plate (18) is fixedly provided at the lower end of the detection frame (2); rollers (19) are fixedly provided at the four corners of the bottom of the bottom plate (18); and the limiting groove (20) is matched with the inner side of the detection frame (2).

6. The portable moisture detection device for the fixing process of Enshi Yu Lu according to claim 5, characterized in that: The limiting groove (20) is matched with the outer edge of the steam killing box body (1) for limiting.

7. A portable detection device for moisture in the fixing process of Enshi Yu Lu according to claim 1, comprising the following steps during the detection process: Step 1: Equipment pretreatment: Place the whiteboard on the test bench and turn on the portable near-infrared spectrometer. Preheat the light source and calibrate the baseline using the whiteboard. Step 2: Sample processing: take out the withered leaf samples from the storage box, spread them on the testing table and gently press them flat; Step 3: Spectral scanning: Press the probe of the portable near-infrared spectrometer vertically downward while maintaining a 45° incident angle of the light source, and collect three consecutive spectra to obtain the average value; Step 4: Model prediction: Spectral data are mapped to moisture content values ​​through chemometric models.

8. The portable moisture detection device for the Enshi Yu Lu fixing process according to claim 7, characterized in that: In step 2, the sample thickness is controlled at 20±2 mm and the pressure is controlled at ≤300 g / cm 2 .

9. The portable moisture detection device for the fixing process of Enshi Yu Lu tea according to claim 7, characterized in that: The portable near-infrared spectrometer in step three covers a wavelength range of 900-1700 nm.

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