Sterile low-temperature nitrogen-filling three-dimensional packaging unit for famous green tea

Abstract

The application discloses a kind of famous and excellent green tea aseptic low-temperature nitrogen filling three-dimensional packaging unit, including low-temperature aseptic cabin, tea canister cleaning and sterilizing machine, tea leaf temporary storage tank, L-shaped nitrogen-rich packaging channel and canning nitrogen filling chamber being arranged in low-temperature aseptic cabin.The tea and tea canister enter low-temperature aseptic cabin first and are sterilized, then complete canning and nitrogen filling in canning nitrogen filling chamber, and complete film sealing packaging in L-shaped nitrogen-rich packaging channel, while guaranteeing the quality of tea packaging, the application can reduce the amount of nitrogen used, reduce the cost of packaging, and can be widely applied in the technical field of tea packaging.

Description

Technical Field

[0001] This invention relates to the field of tea packaging, and in particular to a sterile, low-temperature nitrogen-filled three-dimensional packaging unit for premium green tea. Background Technology

[0002] my country's renowned green teas are beloved beverages both domestically and internationally. However, these premium green teas are also highly sensitive to oxygen, moisture, light, and odors, making them difficult to preserve. Improper packaging and preservation methods can lead to deterioration in color, aroma, flavor, shape, and overall quality, causing them to lose their fresh, tender, and fragrant qualities. Currently, nitrogen-filled sealing packaging is widely used for preserving premium green teas. However, most existing nitrogen-filled sealing packaging equipment operates at room temperature. Production practice shows that during hot seasons, using such equipment not only easily causes oxidation, resulting in a yellowing of the tea leaves, a browning of the tea liquor, and a weakening of the floral and delicate aromas, but also makes it difficult to maintain the excellent "three greens" qualities of bright green color, yellow-green liquor, and tender green leaves. To ensure the nitrogen concentration inside the cans after bottling, the current method involves setting up a large nitrogen chamber filled with nitrogen, and then filling, sealing, and capping the tea within this chamber. Meanwhile, current weighing nitrogen filling machines and sealing packaging machines are arranged in parallel and connected by a horizontal conveyor belt. This results in a large nitrogen chamber space, requiring a lot of nitrogen to fill the entire chamber, and also a large amount of nitrogen loss, leading to high nitrogen consumption and high packaging costs throughout the packaging process. Summary of the Invention

[0003] The purpose of this invention is to provide a low-temperature nitrogen-filled vertical packaging machine for premium green tea, which solves the problems of high nitrogen consumption, high loss, and high packaging costs in existing nitrogen-filled packaging equipment.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a sterile low-temperature nitrogen-filled three-dimensional packaging machine for famous and high-quality green tea, including a low-temperature sterile chamber, with an inlet door and an outlet door respectively provided at both ends of the low-temperature sterile chamber, a tea inlet conveyor belt and a tea canister inlet conveyor belt provided at the inlet door, and a tea canister outlet conveyor belt provided at the outlet door.

[0005] The low-temperature sterile chamber is equipped with a tea can cleaning and sterilization machine that connects to the tea can feeding conveyor belt and cleans and sterilizes the inside and outside of the tea can, and a tea temporary storage tank that connects to the tea feeding conveyor belt and is used to store tea.

[0006] The low-temperature sterile chamber is also equipped with an L-shaped nitrogen-enriched packaging channel. Both ends of the L-shaped nitrogen-enriched packaging channel have openable and closable doors. Above the L-shaped nitrogen-enriched packaging channel is a canning and nitrogen-filling platform. Above the canning and nitrogen-filling platform is a tea weighing and canning machine. A hoist is installed between the inlet end of the tea weighing and canning machine and the outlet end of the tea storage tank. An intermittently moving tea can conveyor belt is installed between the tea can cleaning and sterilizing machine and the canning and nitrogen-filling platform. The tea can conveyor belt intermittently transports tea cans to the canning and nitrogen-filling platform, which is located below the tea weighing and canning machine for canning. The canning and nitrogen-filling platform is located directly above the L-shaped nitrogen-enriched packaging channel and is equipped with a nitrogen-filling device. The canning and nitrogen-filling platform also has a first gripping robot arm that moves the canned tea cans below the nitrogen-filling device for nitrogen filling.

[0007] The diameter of the vertical section of the L-shaped nitrogen-enriched packaging channel is adapted to the tea canister; the horizontal section of the L-shaped nitrogen-enriched packaging channel is equipped with a packaging conveyor belt, on which a film applicator, a sealing machine, and a capping machine are sequentially installed; a second gripping robot is installed between the packaging conveyor belt and the tea canister discharge conveyor belt.

[0008] To preserve the tea leaves under low-temperature nitrogen conditions, the tea storage tank is equipped with an openable lid at the top inlet and a discharge valve at the bottom outlet. The tea storage tank is also equipped with a nitrogen pipe and an exhaust pipe.

[0009] To ensure that the tea is always under a high nitrogen concentration before being canned, a canning and nitrogen-filling chamber is provided above the L-shaped nitrogen-rich packaging channel. The canning and nitrogen-filling platform, the tea weighing and canning machine, and the nitrogen filling device are placed in the canning and nitrogen-filling chamber. The canning and nitrogen-filling chamber is provided with an obstacle hole for the tea can conveyor belt to pass through and a tea inlet located above the tea weighing and canning machine.

[0010] To ensure the cleanliness of nitrogen and reduce the cost of nitrogen filling, a nitrogen filling pipeline is connected to the L-shaped nitrogen-enriched packaging channel, and the exhaust pipe in the low-temperature sterile chamber is connected to the air inlet of the nitrogen generator.

[0011] To ensure a sterile environment inside the low-temperature sterile chamber, a nitrogen generator is installed inside the chamber, with its outlet connected to a nitrogen gas pipe and a nitrogen filling pipe. Two ozone sterilizers are installed inside the sterile chamber, located at the feed door and discharge door of the chamber, respectively. Ultraviolet sterilization lamps are installed on the top of the low-temperature sterile chamber.

[0012] Furthermore, the top of the low-temperature sterile chamber is provided with an air inlet, and the inner wall of the low-temperature sterile chamber is provided with an exhaust port. An air purifier is installed on the air inlet, and a refrigeration unit is connected to the air inlet of the air purifier. An exhaust fan is installed in the exhaust port. A nitrogen concentration detector is also provided in the low-temperature sterile chamber.

[0013] Preferably, the first gripping robot includes a screw module fixedly installed on the nitrogen filling platform, a vertical telescopic cylinder fixedly installed on the slider of the screw module, and a finger cylinder installed on the vertical telescopic cylinder. The inner surfaces of the two grippers of the finger cylinder are arc-shaped structures adapted to the can body. The structure of the second gripping robot is the same as that of the first gripping robot.

[0014] To perform comprehensive sterilization of tea canisters, the tea canister cleaning and sterilization machine includes an ion air purification chamber and a light wave sterilization chamber. The tea canister feeding conveyor belt passes through the canister cleaning and sterilization machine. Negative ion fans blowing towards the tea canisters are installed on the top and side walls of the ion air purification chamber. Correspondingly, a purification pipeline is installed at the bottom of the ion air purification chamber, and a debris collection hopper is installed on the purification pipeline. An exhaust fan is installed inside the purification pipeline. A set of light wave sterilization lamps is installed on the top of the light wave sterilization chamber. A third gripping robot is installed between the tea canister feeding conveyor belt and the tea canister conveyor belt. The structure of the third gripping robot is the same as that of the first gripping robot.

[0015] To precisely control the nitrogen filling amount, the nitrogen filling device includes a cover that presses against the tea canister; a vacuum pipe and a nitrogen filling needle are connected to the cover; a shut-off valve is installed on the vacuum pipe; a nitrogen filling injector is connected above the nitrogen filling needle; the nitrogen filling injector includes a measuring cylinder with graduation markings and an injection stopper; one end of the injection stopper is connected to a power device that drives the injection stopper to move back and forth, and the stroke of the injection stopper is adapted to the amount of nitrogen injected into the tea canister each time; a nitrogen inlet pipe is also connected to one side of the measuring cylinder; and a screen is also installed inside the cover to prevent tea leaves from being sucked into the vacuum pipe.

[0016] The beneficial effects of this invention are as follows: By setting up a low-temperature sterile chamber and a tea canister cleaning and sterilization machine, this invention ensures that the nitrogen-filled packaging of tea is in a low-temperature sterile environment, guaranteeing the sterility of the can after filling, preventing bacterial growth, and improving the quality and shelf life of the tea. After entering the low-temperature sterile chamber, the tea first enters a tea temporary storage tank for nitrogen filling and low-temperature preservation to prevent oxidation. Then, it is lifted by a conveyor into a tea weighing and canning machine for canning. After canning, nitrogen filling is performed. The entire process takes place in a relatively closed canning and nitrogen-filling chamber with a high nitrogen content, ensuring that the tea is always in a nitrogen-rich environment. Nitrogen filling is then performed by a nitrogen filling machine, effectively reducing the amount of nitrogen required. After nitrogen filling, the tea enters an L-shaped nitrogen-rich packaging channel for film application, sealing, and capping. The nitrogen-rich environment prevents air from entering during film application, ensuring the reliability of nitrogen filling. Furthermore, compared to a nitrogen chamber structure, this L-shaped nitrogen-rich packaging channel is smaller in volume and requires less nitrogen, thus reducing the overall nitrogen consumption. This invention not only ensures low-temperature sterility in tea packaging, but also effectively reduces nitrogen usage and lowers packaging costs.

[0017] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is the front view of the present invention.

[0019] Figure 2 This is a front view of the tea canister cleaning and sterilization machine of the present invention.

[0020] Figure 3 This is a front view of the nitrogen-filling device in this invention.

[0021] Figure 4 This is a front view of the first gripping robot in this invention.

[0022] Figure 5 This is a top view of the finger cylinder in this invention. Detailed Implementation

[0023] Examples, such as Figures 1 to 5 As shown, a sterile low-temperature nitrogen-filled three-dimensional packaging unit for premium green tea includes a low-temperature sterile chamber 1, a tea canister cleaning and sterilization machine 5, a tea temporary storage tank 6, an L-shaped nitrogen-rich packaging channel 7, and a canister filling and nitrogen-filling chamber 19, all installed in the low-temperature sterile chamber 1.

[0024] The low-temperature sterile chamber 1 is a closed structure with a stainless steel shell. The chamber is 6.5m long, 4.6m wide, and 3.2m high. It can accommodate equipment such as the tea canister cleaning and sterilization machine 5, the L-shaped nitrogen-enriched packaging channel 7, and the can filling and nitrogen-filling chamber 19 for closed-loop sterile low-temperature nitrogen-filling packaging. The low-temperature sterile chamber 1 is equipped with an inlet door 101 and an outlet door 102 at its two ends. A tea inlet conveyor belt 2 and a tea canister inlet conveyor belt 3 are installed at the inlet door 101, and a tea canister outlet conveyor belt 4 is installed at the outlet door 102. The inlet door 101 has openings corresponding to the tea inlet conveyor belt 2 and the tea canister inlet conveyor belt 3, and the outlet door 102 has an opening corresponding to the tea canister outlet conveyor belt 4. Tea leaves and empty tea canisters are fed into the low-temperature sterile chamber 1 from the outside via the tea inlet conveyor belt 2 and the tea canister inlet conveyor belt 3, respectively. Tea canisters filled with tea leaves are discharged from the low-temperature sterile chamber 1 via the tea canister outlet conveyor belt 4. The inlet door 101 and the outlet door 102 effectively reduce airflow between the inside and outside of the low-temperature sterile chamber 1, ensuring that tea packaging is carried out in a low-temperature sterile environment.

[0025] The low-temperature sterile chamber 1 has an air inlet 103 on its top and an exhaust outlet 104 on its inner wall. An air purifier 23 is installed on the air inlet 103, and a refrigeration unit 24 is connected to the air inlet of the air purifier 23. An exhaust fan 25 is installed inside the exhaust outlet 104. The refrigeration unit 24 provides a constant low temperature, while the air purifier 23 delivers purified and cooled air into the low-temperature sterile chamber 1. Simultaneously, the exhaust fan 25 in the exhaust outlet 104 exhausts the waste gas. The refrigeration unit 24 is a DAKC-80 high-power cold cavity airflow refrigeration unit, capable of providing 1000-1200 cubic meters / h of low-temperature cold air at 10-12°C to the chamber. The refrigeration unit 24 controls the temperature and air intake through a programmable control device, which includes a microcomputer controller and a temperature and humidity measuring instrument. It can automatically set the cold air temperature and intelligently regulate the air intake based on the measured signals from the temperature and humidity measuring instrument, ensuring stable low temperatures within the chamber and enabling low-temperature nitrogen-filled packaging of premium green tea. The inner wall of the low-temperature sterile chamber 1 is lined with a layer of white ceramic tiles, which not only reflects the low temperature and prevents cold air leakage but also facilitates the cleaning of tea dust and debris, maintaining cleanliness and hygiene within the chamber.

[0026] To sterilize the air and equipment inside the chamber, two ozone sterilizers 21 are installed in the low-temperature sterile chamber 1, respectively located at the feed door 101 and the discharge door 102 of the low-temperature sterile chamber 1, to sterilize the tea canisters and tea leaves entering and exiting the conveyor belt, preventing microorganisms and bacteria from invading and contaminating the tea leaves and tea canisters. At the same time, an ultraviolet sterilization lamp 22 is installed at the top of the low-temperature sterile chamber 1 every 1.2-1.5m to irradiate downwards for sterilization.

[0027] The discharge end of the tea feeding conveyor belt 2 connects to the inlet end of the tea storage tank 6, conveying the tea into the tea storage tank 6. The tea storage tank 6 is a closed tank structure, with an openable lid 61 at the top inlet and a discharge valve 62 at the bottom outlet. The tea storage tank 6 is also equipped with a nitrogen pipe 63 and an exhaust pipe 64. When feeding, the lid 61 is opened to allow feeding; after feeding, it is closed. Nitrogen gas is then injected into the tank through the nitrogen pipe 63, and exhaust gas is discharged through the exhaust pipe 64. Both the nitrogen pipe 63 and the exhaust pipe 64 are equipped with corresponding control valves for easy opening during use and closing when not in use. The tea storage tank 6 performs the first nitrogen filling for preservation, preventing oxidation of the tea while awaiting packaging.

[0028] The tea canister cleaning and sterilization machine 5 is connected to the tea canister feeding conveyor belt 3 to perform comprehensive sterilization on the tea canisters before filling. The tea canister cleaning and sterilization machine 5 includes an ion wind cleaning chamber 51 and a light wave sterilization chamber 52. The tea canister feeding conveyor belt 3 passes through the canister cleaning and sterilization machine 5, and the tea canisters pass through the ion wind cleaning chamber 51 and the light wave sterilization chamber 52 in sequence. First, the ion wind cleaning removes dust and other foreign matter adhering to the inside and outside of the tea canister. Then, the tea canisters are irradiated with light wave sterilization lamps for 4-6 seconds to kill microorganisms and bacteria, making the canisters clean, hygienic and sterile. Specifically, the top and side walls of the ion wind cleaning chamber 51 are equipped with negative ion fans 53 that blow air towards the inside of the tea canister. The negative ion fans 53 on the top blow air directly into the inside of the tea canister, and two negative ion fans 53 on the side walls are symmetrically arranged on both sides of the tea canister, blowing air towards the surface of the tea canister at a certain angle. Correspondingly, a dust removal pipe 54 is installed at the bottom of the ion wind dust removal chamber 51, and a dust collection hopper 55 is installed on the dust removal pipe 54. An exhaust fan 25 is installed inside the dust removal pipe 54, which sucks away the dust and impurities blown away by the negative ion fan 53. A set of light wave sterilization lamps 56 is installed at the top of the light wave sterilization chamber 52. When the tea canister passes through the light wave sterilization chamber 52, the tea canister is irradiated and sterilized.

[0029] The canning and nitrogen-filling chamber 19 is equipped with a canning and nitrogen-filling platform 9 and a tea weighing and canning machine 10 located above the canning and nitrogen-filling platform 9. The canning and nitrogen-filling platform 9 is also equipped with a nitrogen-filling device 13. The tea in the tea storage tank 6 is canned and nitrogen-filled in the canning and nitrogen-filling chamber 19. An elevator 11 is provided between the feed end of the tea weighing and canning machine 10 and the discharge end of the tea storage tank 6. The relatively closed structure of the elevator 11 helps to reduce the loss of nitrogen from the tea.

[0030] A tea canister conveyor belt 12, operating intermittently, is installed between the tea canister cleaning and sterilization machine 5 and the canning and nitrogen-filling platform 9. After being cleaned and sterilized by the tea canister cleaning and sterilization machine 5, the tea canisters are conveyed to the canning and nitrogen-filling platform 9 via the tea canister conveyor belt 12, positioned below the tea weighing and canning machine 10 for canning. To facilitate the transfer of tea canisters from the tea canister feeding conveyor belt 3 to the tea canister conveyor belt 12, a third gripping robot 28 is installed between the discharge end of the tea canister feeding conveyor belt 3 and the tea canister conveyor belt 12, enabling the transfer of tea canisters. To facilitate the falling of tea leaves into the tea weighing and canning machine 10 and the entry of tea canisters into the canning and nitrogen-filling platform 9, the canning and nitrogen-filling chamber 19 is provided with clearance holes for the passage of the tea canister conveyor belt 12 and a tea inlet located above the tea weighing and canning machine 10.

[0031] The tea weighing and canning machine 10 includes a vibrating hopper 1001 connected to the elevator 11 and a weighing unit 1002 disposed below the vibrating hopper 1001. The weighing unit 1002 is preferably a multi-head electronic scale, which can be set to different weighing capacities according to different tea canisters and has multiple weighing hoppers, resulting in high efficiency. After the tea canister conveyor belt 12 transports the tea canisters to the canning and nitrogen-filling platform 9 and is located below the discharge port of the weighing unit 1002, the tea canister conveyor belt 12 stops moving, the discharge port of the weighing unit 1002 opens, and the tea leaves fall into the tea canisters below.

[0032] The nitrogen filling device 13 includes a cover 131 that snaps onto the tea canister. The cover 131 can move up and down to engage or disengage with the tea canister. A cylinder drives a support frame to move up and down, and the cover 131 is then fixedly mounted on the support and moves with it. A vacuum pipe 132 and a nitrogen filling needle 133 are connected to the cover 131. A nitrogen filling injector 135 is connected above the nitrogen filling needle 133. The nitrogen filling injector 135 includes a graduated measuring cylinder 13501 and an injection stopper 13502. One end of the injection stopper 13502 is connected to a power device 13503 that drives the injection stopper 13502 to move back and forth. The power device 13503 is preferably a power pump. The stroke of the injection stopper 13502 is adapted to the amount of nitrogen injected into the tea canister each time. The position of the injection stopper 13502 can be adjusted according to the amount of nitrogen injected into the tea canister each time, so that the downward pressure of the injection stopper 13502 is exactly the amount of nitrogen injected into the tea canister each time. A nitrogen inlet pipe 136 is also connected to one side of the measuring cylinder 13501. When the injection plug 13502 moves upward, the inlet pipe 136 connects to the measuring cylinder 13501, supplying nitrogen into the measuring cylinder 13501. When the injection plug 13502 moves downward to fill with nitrogen, the inlet pipe 136 is blocked by the injection plug 13502, stopping the supply of nitrogen. A control valve is provided on the nitrogen filling needle 133 to control the opening and closing of the nitrogen filling needle 133. First, the air in the tea canister is discharged through the vacuum pipe 132, and then nitrogen is injected into the tea canister through the nitrogen filling needle 133. A shut-off valve 134 is provided on the vacuum pipe 132 to control the opening and closing of the vacuum pipe 132. To prevent tea leaves from entering the vacuum pipe 132 during vacuuming, a screen 137 with a mesh size of 10-12 is also provided inside the cover 131 to prevent tea leaves from being sucked into the vacuum pipe 132.

[0033] The nitrogen filling platform 9 is equipped with a first gripping robot 18 that moves the filled tea canisters to below the nitrogen filling device 13 for nitrogen filling. The first gripping robot 18 includes a lead screw module 181 fixedly mounted on the nitrogen filling platform 9, a vertical telescopic cylinder 182 fixedly mounted on the slider of the lead screw module 181, and a finger cylinder 183 mounted on the vertical telescopic cylinder 182. The inner surfaces of the two grippers of the finger cylinder 183 are arc-shaped structures adapted to the can body. The finger cylinder 183 grips the canister tightly. Then, if the vertical telescopic cylinder 182 moves up and down, the tea canister is removed from the tea canister conveyor belt 12. The slider on the lead screw module 181 then moves back and forth, causing the tea canister to move horizontally, moving the filled tea canister below the nitrogen filling device 13. The third gripping robot 28 has the same structure as the first gripping robot 18.

[0034] The L-shaped nitrogen-enriched packaging channel 7 includes a vertical section 72 and a horizontal section 73. Openable and closable doors 8 are provided at the top of the vertical section 72 and at the outlet of the horizontal section 73. The vertical section 72 is located directly below the nitrogen filling device 13 and its diameter is adapted to the tea canister, preventing it from tipping over as it slides down the vertical section 72.

[0035] The horizontal section 73 of the L-shaped nitrogen-enriched packaging channel 7 is equipped with a packaging conveyor belt 14 and a film-sealing packaging machine 15. A second gripping robot 27 is installed between the packaging conveyor belt 14 and the tea canister discharge conveyor belt 4. The structure of the second gripping robot 27 is the same as that of the first gripping robot 18. The packaged tea canisters are removed by the second gripping robot 27.

[0036] To ensure the reliability of the tea canister's conveying position, tea canister bases 100 are provided at intervals on the tea canister feeding conveyor belt 3, tea canister discharging conveyor belt 4, tea canister conveyor belt 12, and packaging conveyor belt 14, and the tea canister bases 100 are used to ensure the position of the tea canister.

[0037] A nitrogen filling pipeline 71 is connected to the L-shaped nitrogen-enriched packaging channel 7. A nitrogen generator 20 is installed inside the low-temperature sterile chamber 1. The outlet of the nitrogen generator 20 is connected to both the nitrogen pipe 63 and the nitrogen filling pipeline 71. The exhaust pipe 64 on the tea storage tank 6 is connected to the air inlet of the nitrogen generator 20 to allow for the circulation and filtration of waste gas still containing residual nitrogen discharged from the tea storage tank. The nitrogen inlet pipe 136 on the nitrogen filling device 13 is also connected to the outlet of the nitrogen generator 20, allowing high-purity nitrogen to be injected into the tea storage tank 6, the nitrogen filling injector 135, and the L-shaped nitrogen-enriched packaging channel 7 through the nitrogen generator 20.

[0038] After the tea canister is filled with nitrogen, the movable door 8 at the top of the vertical section 72 of the L-shaped nitrogen-enriched packaging channel 7 opens. Simultaneously, nitrogen gas is injected into the L-shaped nitrogen-enriched packaging channel 7 via the nitrogen filling pipeline 71. The nitrogen gas exits through the outlet at the top of the vertical section 72, enveloping the nitrogen-filled tea canister in a high concentration of nitrogen. Then, the nitrogen filling device 13 separates from the tea canister, the first gripping manipulator 18 releases, and the tea canister falls into the L-shaped nitrogen-enriched packaging channel 7 and slides onto the packaging conveyor belt 14. Throughout the entire process, the tea leaves inside the canister will not come into contact with external air, preventing nitrogen leakage and air infiltration during the filling and packaging process, which would affect the filling effect. Once the tea canister has fallen into the L-shaped nitrogen-enriched packaging channel 7, the movable door 8 at the top of the vertical section 72 is immediately closed, and the nitrogen filling pipeline 71 stops supplying nitrogen, reducing the amount of nitrogen used. Meanwhile, within the relatively enclosed space of the nitrogen-filling chamber 19, nitrogen gas exiting the L-shaped nitrogen-rich packaging channel 7 can fill the entire chamber, ensuring the tea is placed in a nitrogen-rich environment. Combined with the tea storage tank 6, this keeps the tea in a low-temperature, nitrogen-rich environment, preventing oxidation and thus guaranteeing its quality. Similarly, when the packaged tea from the film-sealing packaging machine 15 exits the L-shaped nitrogen-rich packaging channel 7, the movable door 8 on the horizontal section 73 opens, and simultaneously, the nitrogen filling pipeline 71 opens to prevent air from entering the L-shaped nitrogen-rich packaging channel 7.

[0039] The nitrogen generator 20 is a ZR-50 high-purity nitrogen generator. This machine utilizes the PSA (Pressure Swing Adsorption) principle, using air as raw material. Nitrogen gas passes through a microporous carbon molecular sieve, allowing it to enter a nitrogen enrichment buffer tank via the gaps between the molecular sieves. One tower pressurizes and enriches the nitrogen, while another tower depressurizes and regenerates the molecular sieve. The entire process is fully automated via PLC microcomputer control, with the two towers alternating operation to continuously produce nitrogen gas with a purity of over 95%. To ensure the temperature and nitrogen concentration within the low-temperature sterile chamber 1, a nitrogen concentration detector 26 and a temperature sensor 29 are also installed inside.

[0040] The film-sealing packaging machine 15 includes a film-applying robot 151, an electromagnetic sealing machine 152, and a capping robot 153. The sealing film of the can is a natural seaweed polyester aluminum foil sealing film. This sealing film is a special sealing film made by bonding natural seaweed with polyester (PET) and aluminum foil (AL) under high pressure. It has the characteristics of being sterile, odorless, having good adhesion, and high sealing performance. In particular, because it is rich in alginic acid, agar, carrageenan and other gel-like substances, it has particularly good toughness and flexibility. It can not only overcome the technical obstacle of nitrogen gas causing the film to bulge and crack, but also has a tight adhesion and will not crack or peel off even after 4-5 years of storage at room temperature. It has a very good effect on preserving high-quality green tea.

[0041] The tea canisters on the packaging conveyor belt 14 are first accurately sealed with sealing film by a film-applying robot 151, then heat-sealed by an electromagnetic sealing machine 152, and finally capped by a capping robot 153, completing the packaging. The film-applying robot 151 is a five-fingered, second-generation fully automatic intelligent robot. An electromagnetic film suction device 152 is located in the middle of the robot 151, utilizing electromagnetic attraction to firmly hold the sealing film. Through precise calculations by a PLC system and the coordination of multiple sensors, this robot can simulate a human hand to precisely cover the tea canister opening with the composite film, offering higher efficiency and accuracy than ordinary film-applying machines.

[0042] The electromagnetic sealing machine 152 is a fully automatic air-cooled electromagnetic induction sealing machine of type SED-LF. This machine uses electromagnetic induction to instantly generate high heat on the sealing film at the mouth of the tea canister, and then fuses it to the mouth of the canister to achieve a firm seal. In particular, the machine is also equipped with a cooling air blowing device to quickly cool down the mouth of the tea canister, so as to avoid the high heat from having an adverse effect on the nitrogen and tea inside the canister.

[0043] The capping robot 153 is three-finger shaped, with a suction cup in the middle containing an electromagnet that picks up the can lid. A rotating shaft connects to the capping robot 153, causing it to rotate clockwise to complete the capping. To ensure a tight seal, a sealing gasket is placed inside the can lid. This gasket is made of nano-silicone rubber, which is odorless, absorbs electromagnetic waves, and is heat-resistant. It prevents heat, moisture, and electromagnetic waves from entering the tea can and affecting the tea quality, while also overcoming the drawback of odor from existing rubber gaskets. The advantages of using a film-sealing packaging machine include cleaner and more intelligent processes for film application, sealing, and capping. In particular, the use of natural seaweed polyester aluminum foil sealing film and a wind-cooled electromagnetic induction sealing machine overcomes the technical obstacle of nitrogen causing the film to bulge and crack, and also rapidly cools the can opening, preventing the high heat of the sealing film from adversely affecting the nitrogen and tea inside the can.

[0044] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A machine set for aseptic low-temperature nitrogen-filled three-dimensional packaging of high-quality green tea, characterized in that it comprises: The application relates to a low-temperature aseptic cabin (1) which is provided with a tea leaf feeding cabin door (101) and a tea canister feeding cabin door (102) at two ends respectively, a tea leaf feeding conveying belt (2) and a tea canister feeding conveying belt (3) are arranged at the tea leaf feeding cabin door (101), and a tea canister discharging conveying belt (4) is arranged at the tea canister feeding cabin door (102). A tea canister cleaning and sterilizing machine (5) which is connected with the tea canister feeding conveying belt (3) and is used for cleaning and sterilizing the inside and outside of the tea canister is arranged in the low-temperature aseptic cabin (1), and a tea leaf temporary storage tank (6) which is connected with the tea leaf feeding conveying belt (2) and is used for storing tea leaves is arranged in the low-temperature aseptic cabin (1). An L-shaped nitrogen-rich packaging channel (7) is further arranged in the low-temperature aseptic cabin (1), the L-shaped nitrogen-rich packaging channel (7) comprises a vertical section (72) and a horizontal section (73), a movable door (8) which can be opened and closed is arranged at the top of the vertical section (72) and the outlet of the horizontal section (73), a canister filling and nitrogen charging platform (9) is arranged above the L-shaped nitrogen-rich packaging channel (7), a tea leaf weighing and canister filling machine (10) is arranged above the canister filling and nitrogen charging platform (9), a lifting machine (11) is arranged between the feeding end of the tea leaf weighing and canister filling machine (10) and the discharging end of the tea leaf temporary storage tank (6), the tea leaf weighing and canister filling machine (10) comprises a vibrating hopper (1001) which is connected with the lifting machine (11) and a weighing unit (1002) which is arranged below the vibrating hopper (1001); a tea canister conveying belt (12) which makes intermittent movement is arranged between the tea canister cleaning and sterilizing machine (5) and the canister filling and nitrogen charging platform (9), the tea canister conveying belt (12) intermittently conveys tea canisters to the canister filling and nitrogen charging platform (9) and below the tea leaf weighing and canister filling machine (10) to fill the tea canisters; the canister filling and nitrogen charging platform (9) is provided with a nitrogen charging device (13) which is located directly above the L-shaped nitrogen-rich packaging channel (7), and a first grabbing mechanical arm (18) which moves the filled tea canisters to the nitrogen charging device (13) below to charge nitrogen is further arranged on the canister filling and nitrogen charging platform (9); The diameter of the vertical section of the L-shaped nitrogen-rich packaging channel (7) is matched with the tea canister; the horizontal section of the L-shaped nitrogen-rich packaging channel (7) is provided with a packaging conveying belt (14), a film sticking machine (15), a sealing machine (16) and a cap screwing machine (17) are sequentially arranged on the packaging conveying belt (14); a second grabbing mechanical arm (27) is arranged between the packaging conveying belt (14) and the tea canister discharging conveying belt (4); A canister cover (61) which can be opened is arranged at the top feeding port of the tea leaf temporary storage tank (6), a discharging valve (62) is arranged at the bottom discharging end, a nitrogen pipe (63) and an exhaust pipe (64) are further arranged on the tea leaf temporary storage tank (6); A canister filling and nitrogen charging chamber (19) is arranged above the L-shaped nitrogen-rich packaging channel (7), the canister filling and nitrogen charging platform (9), the tea leaf weighing and canister filling machine (10) and the nitrogen charging device (13) are arranged in the canister filling and nitrogen charging chamber (19), and the canister filling and nitrogen charging chamber (19) is provided with an avoiding hole through which the tea canister conveying belt (12) passes and a tea leaf feeding port which is located above the tea leaf weighing and canister filling machine (10). The nitrogen charging pipeline (71) is arranged on the L-shaped nitrogen-rich packing channel (7), the nitrogen generator (20) is arranged in the low-temperature sterile cabin (1), the outlet of the nitrogen generator (20) is connected with the nitrogen pipe (63) and the nitrogen charging pipeline (71) respectively, and the exhaust pipe (64) of the tea temporary storage tank (6) is connected with the air inlet end of the nitrogen generator (20); The low-temperature sterile cabin (1) is provided with two ozone sterilizers (21) arranged at the inlet cabin door (101) and the outlet cabin door (102) of the low-temperature sterile cabin (1) respectively; and the ultraviolet sterilization lamp (22) is arranged on the top of the low-temperature sterile cabin (1). The tea tank cleaning and sterilization machine (5) comprises an ion wind impurity removal cabin (51) and a light wave sterilization cabin (52), the tea tank feeding conveying belt (3) passes through the tank cleaning and sterilization machine (5), the ion wind impurity removal cabin (51) is provided with the negative ion fan (53) blowing towards the tea tank on the top and the side wall of the ion wind impurity removal cabin (51), the impurity removal pipeline (54) is arranged at the bottom of the ion wind impurity removal cabin (51) correspondingly, the impurity removal pipeline (54) is provided with the impurity collection hopper (55), and the exhaust fan (25) is arranged in the impurity removal pipeline (54); the light wave sterilization cabin (52) is provided with a group of light wave sterilization lamps (56) on the top; the third grabbing manipulator (28) is arranged between the tea tank feeding conveying belt (3) and the tea tank conveying belt (12), and the third grabbing manipulator (28) has the same structure as the first grabbing manipulator (18).

2. The machine for aseptically and low-temperature nitrogen-charged three-dimensional packaging of famous green tea according to claim 1, characterized in that: The low-temperature sterile cabin (1) is provided with the air inlet (103) on the top, and the air outlet (104) is arranged on the inner wall of the low-temperature sterile cabin (1), the air purifier (23) is installed on the air inlet (103), the air purifier (23) is provided with the refrigeration machine (24) connected with the air inlet end, and the exhaust fan (25) is installed in the air outlet (104); the nitrogen concentration detector (26) is further arranged in the low-temperature sterile cabin (1).

3. The machine for aseptically and low-temperature nitrogen-charged three-dimensional packaging of famous green tea according to claim 1, characterized in that: The first grabbing manipulator (18) comprises the lead screw module (181) fixedly installed on the tank filling and nitrogen charging platform (9), the vertical telescopic air cylinder (182) fixedly arranged on the sliding block of the lead screw module (181), and the finger air cylinder (183) installed on the vertical telescopic air cylinder (182), wherein the inner side surfaces of the two clamping jaws of the finger air cylinder (183) are arc surfaces matched with the tank body; and the second grabbing manipulator (27) has the same structure as the first grabbing manipulator (18).

4. The machine for aseptically and low-temperature nitrogen-charged three-dimensional packaging of famous green tea according to claim 1, characterized in that: The nitrogen filling device (13) comprises a cover (131) buckled on the tea can; the cover (131) is connected with a vacuum extraction pipeline (132) and a nitrogen filling needle tube (133); the vacuum extraction pipeline (132) is provided with a stop valve (134); the nitrogen filling needle tube (133) is connected with a nitrogen filling syringe (135) above; the nitrogen filling syringe (135) comprises a metering cylinder (1351) with a scale mark and a syringe plug (1352); one end of the syringe plug (1352) is connected with a power device (1353) for driving the syringe plug (1352) to move back and forth, and the stroke of the syringe plug (1352) is matched with the amount of nitrogen gas injected into the tea can each time; one side of the metering cylinder (1351) is further connected with a nitrogen gas inlet pipeline (136); the cover (131) is further provided with a screen (137) for preventing tea from being sucked into the vacuum extraction pipeline (132).

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