Tea polyphenol preservation type vacuum freeze-drying system

Abstract

The utility model relates to the technical field of tea drying, provide a kind of tea polyphenol preservation type vacuum freeze drying system, including vacuum drying cylinder;The bottom end inside the vacuum drying cylinder is provided with base, and the top of base is provided with rack, the inside of rack is uniformly distributed with tray, and rack is provided with vibrating mechanism, the vibrating mechanism includes the vibrating disk of setting in tray bottom, and vibrating disk below both sides are evenly provided with the tray in rack, the both ends of the top of tray are connected with the bottom of vibrating disk by sleeve, the shaft is evenly provided between tray, and the beating piece is evenly distributed on the shaft. The utility model is provided with vibrating mechanism, so that tray can produce uniform vibration force, vibration force makes tea on tray continuously slightly turn, avoid tea stack and form dense layer, tea under the action of vibration, tea gap is uniform, cold quantity rapidly penetrates from tray to tea interior, improves the uniformity and efficiency of cooling.

Description

Technical Field

[0001] This utility model relates to the field of tea drying technology, and in particular to a vacuum freeze-drying system for preserving tea polyphenols. Background Technology

[0002] A vacuum freeze-drying system for tea is a specialized freeze-drying equipment for the deep processing of tea. Its core function is to sublimate the moisture in tea leaves from solid ice to gaseous water vapor and remove it under vacuum and low temperature conditions, ultimately obtaining a low-moisture, high-fidelity dried tea product. This fundamentally inhibits the loss of tea polyphenols and is a key piece of equipment for high-end tea processing. For example, a vacuum freeze-drying device for tea production disclosed in patent number CN211882024U involves placing tea leaves in a tea storage box, and then placing the tea storage box into a vacuum freeze-drying chamber. Limiting blocks and connecting limiting balls facilitate the removal of the tea storage box for cleaning. However, this tea storage box lacks a vibration structure, and the tea leaves are in a static state during freeze-drying. The heat dissipation rate at the point where the tea leaves are stacked and the point of contact with the tray is significantly different, which can easily lead to uneven cooling.

[0003] In view of this, the inventor conducted in-depth research on the aforementioned deficiencies in the prior art, which led to the creation of this case. Summary of the Invention

[0004] The main purpose of this invention is to provide a vacuum freeze-drying system for preserving tea polyphenols, in order to solve the problem of uneven cooling of tea by existing drying systems.

[0005] To achieve the above objectives, the solution of this utility model is: A vacuum freeze-drying system for preserving tea polyphenols includes a vacuum drying cylinder; The vacuum drying cylinder has a base at the bottom and a placement rack at the top. The placement rack has trays evenly distributed inside and a vibration mechanism on it. The vibration mechanism includes a vibrating plate at the bottom of the tray and a support plate in the placement rack on both sides below the vibrating plate. The top two ends of the support plate are connected to the bottom of the vibrating plate through sleeves. A rotating shaft is provided between the support plates, and striking elements are evenly distributed on the rotating shaft. The vibration mechanism also includes a drive box located on one side of the placement frame, and a drive shaft is provided inside the drive box via a first drive motor. The drive shaft has evenly distributed drive gears, and one end of each shaft extends into the drive box, with a driven gear meshing with the drive gear at one end of each shaft.

[0006] Preferably, cold traps are provided on both sides inside the vacuum drying cylinder, and the cold traps are symmetrically distributed about the placement rack.

[0007] Preferably, both sides of the tray are provided with slide rails, and both sides of the vibratory feeder are provided with slide grooves that match the slide rails.

[0008] Preferably, each sleeve has a connecting post inside by a return spring, and the top of each connecting post is connected to the bottom of the vibrating plate. Limiting grooves are opened on both sides inside the sleeve, and limiting blocks matching the limiting grooves are provided on both sides of the bottom of each connecting post.

[0009] Preferably, the base has a groove inside, and a lead screw is installed inside the groove. A drive block is sleeved on the lead screw, and the drive block is connected to one side of the bottom of the placement frame. A second drive motor is fixed to one side of the base, and the output end of the second drive motor is connected to the lead screw.

[0010] Preferably, guide rails are provided on both sides of the top of the base, and guide grooves matching the guide rails are provided on both sides of the bottom of the placement rack.

[0011] Preferably, a vacuum pump is installed at the top of the vacuum drying cylinder, and the vacuum pump is sealed to the air extraction port at the top of the vacuum drying cylinder through a stainless steel pipe with a vacuum valve. A heating tube is installed at the top inside the vacuum drying cylinder, and the heating tube is electrically connected to an external PLC controller through a temperature control wire. A refrigeration unit is installed at the bottom of the vacuum drying cylinder, and the refrigeration unit is connected to the inside of the vacuum drying cylinder through a refrigerant pipe.

[0012] With the above structure, the advantages of the tea polyphenol preservation vacuum freeze-drying system disclosed in this utility model are as follows: The system comprises a vacuum drying cylinder, a base, a placement rack, a tray, and a vibration mechanism. The vibration mechanism includes a vibrating disc, a sleeve, a return spring, a connecting column, a support plate, a rotating shaft, striking components, a drive box, a first drive motor, a driving gear, and a driven gear. The tea leaves to be dried are placed on the tray, which has slide rails on both sides. The tray connects to the vibrating disc via slide rails inserted into grooves on both sides of the vibrating disc. During the drying process, the first drive motor drives the drive shaft to rotate, causing the driving gear on it to rotate. This, in turn, drives the driven gear and the rotating shaft to rotate, causing the protrusions of the striking components to rotate upwards, vibrating the tea leaves. As the disc is lifted upwards, the connecting column at the bottom of the vibratory disc moves upwards, pulling the return spring to extend. As the striking component continues to rotate, its protrusion gradually detaches from the bottom of the vibratory disc, the upward pushing force disappears, and the previously stretched return spring releases its elastic potential energy, generating a downward rebound force, which drives the vibratory disc to fall rapidly downwards along the connecting column. This cycle allows the vibratory disc and the tray on top to generate uniform vibration force. The vibration force causes the tea leaves on the tray to continuously and slightly turn over, preventing the tea leaves from piling up and forming a dense layer. Under the action of vibration, the gaps between the tea leaves are uniform, and the cold energy quickly penetrates from the tray into the interior of the tea leaves, improving the uniformity and efficiency of cooling. Furthermore, by creating a groove in the base, a lead screw is installed in the groove, and a drive block is sleeved on the lead screw. The drive block is connected to the placement rack, and the lead screw is driven to rotate by a second drive motor, causing the drive block to move horizontally along the lead screw. This allows the placement rack to automatically move out of the vacuum drying cylinder. The placement rack loads and unloads materials outside the vacuum drying cylinder, reducing contact between tea leaves and internal components of the vacuum drying cylinder, thus reducing the risk of contamination. At the same time, it eliminates the need for operators to manually pull out and push back the placement rack, preventing direct contact with the low-temperature placement rack, reducing labor intensity and improving safety. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional front view structural diagram of the placement rack of this utility model; Figure 3 This is a three-dimensional structural diagram of the vibration mechanism of this utility model; Figure 4 This is a schematic diagram of the three-dimensional cross-sectional structure of the sleeve of this utility model; Figure 5 This is a three-dimensional rear view schematic diagram of the placement rack of this utility model. In the diagram: 1. Vacuum drying cylinder; 2. Base; 3. Tray; 4. Vibration mechanism; 401. Vibrating plate; 402. Sleeve; 403. Support plate; 404. Drive box; 405. First drive motor; 406. Drive shaft; 407. Drive gear; 408. Driven gear; 409. Rotating shaft; 4010. Impact component; 4011. Return spring; 4012. Connecting column; 4013. Limiting groove; 5. Vacuum pump; 6. Cold trap; 7. Refrigeration unit; 8. Heating tube; 9. Placement rack; 10. Lead screw; 11. Guide rail; 12. Slide rail; 13. Groove; 14. Second drive motor; 15. Drive block. Detailed Implementation

[0014] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0015] like Figures 1 to 5 As shown, this is a vacuum freeze-drying system for preserving tea polyphenols, which includes a vacuum drying cylinder 1. Please see Figure 1 , Figure 2 and Figure 5The vacuum drying cylinder 1 has a base 2 at the bottom and a placement rack 9 at the top. The placement rack 9 has trays 3 evenly distributed inside. The base 2 has a groove 13 inside and a lead screw 10 inside. A drive block 15 is sleeved on the lead screw 10 and connected to one side of the bottom of the placement rack 9. A second drive motor 14 is fixed on one side of the base 2 and the output end of the second drive motor 14 is connected to the lead screw 10. Guide rails 11 are provided on both sides of the top of the base 2 and guide grooves matching the guide rails 11 are provided on both sides of the bottom of the placement rack 9. Place the tea leaves to be dried on the tray 3, and then start the second drive motor 14. The second drive motor 14 drives the lead screw 10 in the groove 13 of the base 2 to rotate, so that the drive block 15 on the lead screw 10 moves horizontally along the lead screw 10, and drives the placement rack 9 to automatically move into the vacuum drying cylinder 1. The bottom of the placement rack 9 cooperates with the top guide rail 11 of the base 2 through the guide groove to achieve smooth movement. This process does not require manual pushing and pulling of the placement rack 9, reducing labor intensity and safety risks. In addition, the placement rack 9 is loaded and unloaded from the outside, which reduces the contact between the tea leaves and the internal parts of the vacuum drying cylinder 1, reducing the risk of contamination. Please see Figure 2-4 The placement rack 9 is equipped with a vibration mechanism 4, which includes a vibrating plate 401 located at the bottom of the tray 3. Both sides of the tray 3 are provided with slide rails 12, and both sides of the vibrating plate 401 are provided with grooves that match the slide rails 12. The slide rails 12 on both sides of the tray 3 are inserted and engaged with the grooves on both sides of the vibrating plate 401 to achieve a stable connection between the tray 3 and the vibrating plate 401. A vacuum pump 5 is installed at the top of the vacuum drying cylinder 1, and the vacuum pump 5 is sealed to the air extraction port at the top of the vacuum drying cylinder 1 through a stainless steel pipe with a vacuum valve. A heating tube 8 is installed at the top inside the vacuum drying cylinder 1, and the heating tube 8 is electrically connected to an external PLC controller through a temperature control wire. A refrigeration unit 7 is installed at the bottom of the vacuum drying cylinder 1, and the refrigeration unit 7 is connected to the inside of the vacuum drying cylinder 1 through a refrigerant pipe. The placement racks 9 on both sides below the vibratory feeder 401 are equipped with trays 403. The top ends of the trays 403 are connected to the bottom of the vibratory feeder 401 through sleeves 402. The sleeves 402 are equipped with connecting posts 4012 through return springs 4011. The top of the connecting posts 4012 is connected to the bottom of the vibratory feeder 401. Limiting grooves 4013 are opened on both sides inside the sleeves 402. Limiting blocks matching the limiting grooves 4013 are provided on both sides of the bottom of the connecting posts 4012. A rotating shaft 409 is provided between each of the trays 403, and striking elements 4010 are evenly distributed on the rotating shaft 409. The vibration mechanism 4 also includes a drive box 404 provided on one side of the placement frame 9. A drive shaft 406 is provided inside the drive box 404 through a first drive motor 405. A drive gear 407 is evenly distributed on the drive shaft 406. One end of each rotating shaft 409 extends into the drive box 404, and a driven gear 408 that meshes with the drive gear 407 is provided at one end of each rotating shaft 409. Next, the refrigeration unit 7 is started. The refrigeration unit 7 delivers cooling capacity into the vacuum drying cylinder 1 through refrigerant pipelines. The basic components of the refrigeration unit 7 include a compressor, condenser, evaporator, etc., which are existing technologies. At the same time, the first drive motor 405 of the vibration mechanism 4 is started. The first drive motor 405 drives the drive shaft 406 in the drive box 404 to rotate, which in turn drives the drive gear 407 on the drive shaft 406 to rotate. The drive gear 407 drives the meshing driven gear 408 and the rotating shaft 409 to rotate. The protrusion of the striking part 4010 on the rotating shaft 409 rotates upward and lifts the vibrating plate 401. The connecting column 4012 at the bottom of the vibrating plate 401 moves along the sleeve The cylinder 402 moves upward and stretches the return spring 4011. The bottom limiting block of the connecting column 4012 moves along the limiting groove 4013 inside the sleeve 402 to ensure stability. When the protrusion of the striking part 4010 disengages from the bottom of the vibrating plate 401, the return spring 4011 releases elastic potential energy to drive the vibrating plate 401 back down, forming a uniform vibration force in a cycle. The vibration force causes the tea leaves on the tray 3 to continuously and slightly turn over, avoiding the formation of a dense layer and ensuring uniform gaps between the tea leaves. This allows the cold energy delivered by the refrigeration unit 7 to quickly penetrate from the tray 3 into the interior of the tea leaves, improving the uniformity and efficiency of cooling, and quickly freezing the moisture in the tea leaves into tiny ice crystals, protecting the cell structure and reducing the oxidation of tea polyphenols. After the tea leaves have frozen, the refrigeration unit 7 is turned off and the vacuum pump 5 is started. The vacuum pump 5 draws a vacuum from the top air extraction port of the vacuum drying cylinder 1 through a stainless steel pipe with a vacuum valve, reducing the air pressure inside the cylinder. At the same time, the heating tube 8 at the top of the vacuum drying cylinder 1 is started. The heating tube 8 is controlled by an external PLC controller through a temperature control wire to transfer gentle heat to the tea leaves. The solid ice inside the tea leaves sublimates to produce water vapor. The cold traps 6 symmetrically distributed on both sides inside the vacuum drying cylinder 1 are connected to separate refrigeration systems to quickly capture water vapor. The vibration mechanism 4 works continuously to break the air film resistance on the surface of the tea leaves, promote the rapid desorption and diffusion of water vapor, and prevent the surface from drying and the inside from freezing. After most of the free water in the tea leaves is removed, the heating tube 8 is heated appropriately to enter the decomposition stage, further removing the bound water in the tea leaves and reducing the moisture content of the tea leaves to the standard range. After drying is completed, the vacuum pump 5 and the heating tube 8 are turned off, and the second drive motor 14 is started again to drive the placement rack 9 to automatically move out of the vacuum drying cylinder 1. The tray 3 is removed to complete the tea leaf discharge. The entire process achieves efficient preservation of tea polyphenols through the coordinated operation of various structures, while improving drying efficiency and operational safety.

[0016] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A vacuum freeze-drying system for preserving tea polyphenols, comprising a vacuum drying cylinder (1); Its features are: The vacuum drying cylinder (1) has a base (2) at the bottom and a placement rack (9) at the top. The placement rack (9) has trays (3) evenly distributed inside and a vibration mechanism (4) on it. The vibration mechanism (4) includes a vibrating plate (401) at the bottom of the tray (3) and a support plate (403) in the placement rack (9) on both sides below the vibrating plate (401). The top two ends of the support plate (403) are connected to the bottom of the vibrating plate (401) through sleeves (402). A rotating shaft (409) is provided between the support plates (403), and striking parts (4010) are evenly distributed on the rotating shaft (409). The vibration mechanism (4) further includes a drive box (404) disposed on one side of the placement frame (9), and a drive shaft (406) is disposed inside the drive box (404) via a first drive motor (405). A drive gear (407) is evenly distributed on the drive shaft (406), and one end of each rotating shaft (409) extends into the drive box (404), and one end of each rotating shaft (409) is provided with a driven gear (408) that meshes with the drive gear (407).

2. The vacuum freeze-drying system for preserving tea polyphenols according to claim 1, characterized in that: Cold traps (6) are provided on both sides inside the vacuum drying cylinder (1), and the cold traps (6) are symmetrically distributed about the placement rack (9).

3. The vacuum freeze-drying system for preserving tea polyphenols according to claim 1, characterized in that: The tray (3) is provided with slide rails (12) on both sides, and the vibratory plate (401) has grooves on both sides inside that match the slide rails (12).

4. The vacuum freeze-drying system for preserving tea polyphenols according to claim 1, characterized in that: The sleeve (402) has a connecting post (4012) inside through a return spring (4011), and the top of the connecting post (4012) is connected to the bottom of the vibrating plate (401). Limiting grooves (4013) are opened on both sides inside the sleeve (402), and limiting blocks matching the limiting grooves (4013) are provided on both sides of the bottom of the connecting post (4012).

5. The vacuum freeze-drying system for preserving tea polyphenols according to claim 1, characterized in that: The base (2) has a groove (13) inside, and a lead screw (10) is provided inside the groove (13). A drive block (15) is sleeved on the lead screw (10), and the drive block (15) is connected to one side of the bottom of the placement frame (9). A second drive motor (14) is fixed on one side of the base (2), and the output end of the second drive motor (14) is connected to the lead screw (10).

6. The vacuum freeze-drying system for preserving tea polyphenols according to claim 1, characterized in that: The base (2) has guide rails (11) on both sides of the top, and the placement rack (9) has guide grooves on both sides of the bottom that match the guide rails (11).

7. The vacuum freeze-drying system for preserving tea polyphenols according to claim 1, characterized in that: The vacuum drying cylinder (1) is equipped with a vacuum pump (5) at the top, and the vacuum pump (5) is sealed to the air extraction port at the top of the vacuum drying cylinder (1) through a stainless steel pipe with a vacuum valve. The vacuum drying cylinder (1) is equipped with a heating tube (8) at the top inside, and the heating tube (8) is electrically connected to an external PLC controller through a temperature control wire. The vacuum drying cylinder (1) is equipped with a refrigeration unit (7) at the bottom, and the refrigeration unit (7) is connected to the inside of the vacuum drying cylinder (1) through a refrigerant pipe.

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