A vacuum nitrogen filling and automatic packaging machine for tea

Abstract

This utility model discloses an integrated machine for vacuum nitrogen filling and automatic packaging of tea, belonging to the technical field of tea processing equipment. It includes a tea feeding hopper, a frame, a processing plate, at least two processing chambers, a packaging bag, a steering component, a vacuum component, a nitrogen filling component, and a sealing component. The processing chambers are located below the feeding hopper, forming feeding stations. The vacuum component, nitrogen filling component, and sealing component are respectively arranged on one side of the processing chamber. The steering component drives the processing plate to rotate between the two stations. The vacuum component and the nitrogen filling component are integrated and share a dual-channel insertion gas pipe. The gas pipe is inserted into the packaging bag; the upper channel communicates with the vacuum component to remove air from the bag, and the lower channel communicates with the nitrogen filling component to fill it with high-purity nitrogen. The upper and lower channels of the gas pipe are controlled by independent gas valves, and the outlets have a height difference. This utility model provides a new integrated structure for vacuum nitrogen filling and automatic packaging of tea, with advantages of high practicality and good packaging effect.

Description

Technical Field

[0001] This utility model relates to the technical field of tea processing equipment, and in particular to an integrated machine for vacuum nitrogen filling and automatic packaging of tea. Background Technology

[0002] To improve the preservation of tea, vacuum or nitrogen-filled packaging methods are commonly used to reduce the oxygen content inside the bag, prevent oxidation, and extend the tea's circulation and storage period. Existing tea packaging equipment mostly involves vacuuming or nitrogen-filling before sealing, or using ordinary sealing equipment for heat sealing. This approach has the following main shortcomings: During the nitrogen filling stage, existing nitrogen filling systems often employ a single nozzle or a single air duct structure, which has weak capabilities in gas replacement, nitrogen distribution, and residual oxygen control within the bag, resulting in uneven nitrogen distribution, high residual oxygen levels, and poor preservation effects. Taking the vacuum nitrogen-filling packaging machine disclosed in patent CN101209756A as an example, although it proposes an integrated vacuum and nitrogen filling packaging machine structure, it uses a simple suction chamber, nitrogen pouring, and sealing structure, failing to address structural solutions to the potential deformation and pressure issues of tea packaging bags during vacuuming, as well as the difficulty of gas replacement in the gaps between tea leaves. In the sealing process, existing sealing devices are typically single heat-sealing structures, failing to consider issues such as gas expansion in the sealing area, secondary air intake, or deterioration of airtightness due to bag deformation after sealing.

[0003] Although there are small-can packaging devices for tea, such as the automatic small-can tea packaging machine published in patent CN108313429B which proposes a turntable device structure, it focuses on the metering, filling and sealing process of small-can tea, and does not specifically propose an integrated vacuum nitrogen filling and sealing structure, nor does it solve the problems of bag deformation and gas replacement difficulties during the vacuum / nitrogen filling process.

[0004] In addition, the existing technology also has the following drawbacks: 1. During the vacuum stage, the packaging bag is prone to collapse, tea deformation, or bag rupture due to direct air extraction from the outer cavity or sudden pressure changes, which affects the sealing quality.

[0005] 2. The nitrogen filling nozzle or gas channel design is too simple, making it impossible to form a uniform nitrogen flow field to fully replace the remaining air in the bag.

[0006] 3. The sealing mold has a simple structure, which only heat seals without considering subsequent cooling, compression reinforcement or gas cavity protection, resulting in the inability to further improve the airtightness of the sealing area.

[0007] This utility model was developed to address common problems in the field, such as the risk of packaging bag deformation, uneven nitrogen distribution, poor control of residual oxygen, and weak sealing airtightness. Utility Model Content

[0008] The purpose of this invention is to address the shortcomings of current technology by proposing an integrated machine for vacuum nitrogen filling and automatic packaging of tea leaves.

[0009] In order to overcome the shortcomings of the existing technology, the present invention adopts the following technical solution: A tea vacuum nitrogen filling and automatic packaging integrated machine includes a tea feeding hopper, a frame, a processing plate, at least two processing chambers disposed within the processing plate, a packaging bag, a steering component, a vacuum component, a nitrogen filling component, and a sealing component. The processing chambers are disposed below the feeding path of the tea feeding hopper to form a feeding station. The vacuum component, nitrogen filling component, and sealing component are respectively disposed on one side of the processing chamber. The steering component drives the processing plate to rotate between the feeding station and the sealing station. The vacuum component and the nitrogen filling component are mounted on the sealing component and share the same dual-channel insertion tube. The dual-channel insertion tube is inserted into the packaging bag. The upper channel of the dual-channel insertion tube is connected to the vacuum component and removes gas from the bag. The lower channel of the dual-channel insertion tube is connected to the nitrogen source of the nitrogen filling component and fills the bag with high-purity nitrogen after the vacuum is removed. The upper and lower channels of the tube are controlled by independent gas valves, and there is a height difference between the upper and lower outlets.

[0010] Optionally, the sealing component includes a sealing seat, a sealing plate, a sliding block disposed on the sealing plate, a sealing heating element, a clamping rod, a clamping drive mechanism, a sealing air pump, and an actuating air rod. The sealing seat has a hollow actuating cavity. The clamping rod is drivenly connected to the clamping drive mechanism to form a clamping part. The output end of the clamping part is connected to the sealing plate to form a clamping part. The clamping part is disposed on the front and rear sides of the actuating cavity. The sealing plate also has a sliding track. The sliding block is slidably connected to the sliding track. The output end of the actuating air rod is connected to the sliding block. The sealing air pump is connected to the air inlet pipe of the actuating air rod through a pipe. The sealing heating element is disposed on the contact end face between the sliding block and the edge of the packaging bag.

[0011] Optionally, the sealing component further includes an ejector air rod and an ejector air pump, wherein the air inlet of the ejector air rod is connected to the ejector air pump pipe, and the output end of the ejector air rod is positioned opposite the dual-channel insertion air pipe.

[0012] Optionally, the steering component includes a rotation drive mechanism and at least two positioning markers, which are disposed in the delivery station and the sealing station. The output shaft of the rotation drive mechanism is coaxially disposed and connected to the axis of the processing plate.

[0013] Optionally, the vacuum component includes a vacuum pump and a vacuum pipe, wherein the vacuum nozzle of the vacuum pump is connected to the upper channel pipe of the dual-channel insertion air pipe through the vacuum pipe.

[0014] Optionally, the nitrogen filling component includes a nitrogen source, a pressure reducing and flow regulating valve, a gas switching solenoid valve, a filter, and a flow guiding nozzle assembly. The nitrogen source is connected to the input end of the solenoid valve through the pressure reducing and flow regulating valve. The output end of the solenoid valve is connected to the lower channel of the dual-channel insertion gas pipe through a nitrogen filling pipe. The flow guiding nozzle assembly is disposed at the outlet end of the lower channel. The filter is disposed between the pressure reducing and flow regulating valve and the solenoid valve. The flow guide nozzle assembly includes a central nozzle and an annular flow guide hole. The central nozzle is used to inject high-purity nitrogen into the packaging bag, and the annular flow guide hole is used to form a guiding airflow along the bag wall.

[0015] Optionally, the sealing component includes a nitrogen gas curtain hood outside the sealing seat. The gas curtain hood is connected to the nitrogen source of the nitrogen filling component and continuously releases a small amount of nitrogen into the sealing area during the sealing stage to form a local inert atmosphere.

[0016] Optionally, the sliding block is provided with a sealing groove for placing one end of the packaging bag along its edge, and the sealing groove extends along the length of the sliding block.

[0017] Optionally, the sealing groove is provided with a ridge-forming airbag, a miniature air pump, and an isolation seat. The miniature air pump inflates the ridge-forming airbag through a restart pipe. The ridge-forming airbag is disposed on the bottom wall of the sealing groove. The isolation seat is disposed on the side of the ridge-forming airbag facing the packaging bag. The sealing heating element is disposed on the isolation seat.

[0018] Optionally, the dual-channel insertion endotracheal tube is provided with a flexible sealing sleeve on the outside, which is made of high-temperature resistant silicone material.

[0019] The beneficial effects achieved by this utility model are: 1. By sequentially coordinating vacuum components and nitrogen-filling components, efficient switching between vacuum extraction and nitrogen replacement is achieved, significantly reducing the residual oxygen content inside the bag and improving the long-term preservation performance of tea. 2. By cooperating with the steering component and the vacuum component, the packaging bag remains stable during vacuum operation and station switching, preventing the bag from collapsing or the tea from being deformed due to uneven negative pressure, and ensuring the packaging shape and flatness. 3. Through the synergistic effect of the sealing components and the nitrogen-filling components, the sealing area is heat-sealed under an inert atmosphere, avoiding air backflow and oxidation residue, and improving the airtightness and sealing strength of the seal; 4. By cooperating with the nitrogen filling component and the sealing component, the nitrogen filling process is completed in a directional direction within the sealing station, achieving uniform gas replacement inside the bag, avoiding localized high residual oxygen levels, and ensuring uniform nitrogen distribution and stable preservation effect; 5. Through the coordinated operation of the steering component, vacuum component, nitrogen filling component and sealing component, the equipment maintains stable packaging bags, uniform airflow, low residual oxygen and tight sealing throughout the vacuum, nitrogen filling and sealing process, giving the equipment a comprehensive advantage of high freshness preservation, high sealing performance and high automation efficiency. Attached Figure Description

[0020] The present invention can be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but rather the emphasis is on illustrating the principles of the embodiments. In different views, the same reference numerals designate the same parts.

[0021] Figure 1 This is a partial cross-sectional view of the present invention from the front view.

[0022] Figure 2 for Figure 1 Enlarged schematic diagram of part A in the middle.

[0023] Figure 3 for Figure 2 Enlarged schematic diagram of section B.

[0024] Figure 4 This is a partial top view of the processing plate, vacuum component, nitrogen-filling component, and sealing component of this utility model.

[0025] Figure 5 for Figure 4 Enlarged diagram of section C.

[0026] Figure 6 for Figure 4 Enlarged schematic diagram of section D in the middle.

[0027] Figure 7 for Figure 4 Enlarged schematic diagram of section E in the middle.

[0028] Figure 8 This is a front view schematic diagram of the dual-channel insertion trachea of ​​this utility model.

[0029] Figure 9 This is a front view schematic diagram of the packaging bag of this utility model.

[0030] Figure 10 This is a bottom view of the sliding block and packaging bag of this utility model.

[0031] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Processing plate; 3. Tea feeding hopper; 4. Sealing air pump; 5. Packaging bag; 6. Output end; 7. Sliding block; 8. Nitrogen curtain; 9. Vacuum pipe; 10. Placement seat; 11. Ejection rail; 12. Actuating air rod; 13. Dual-channel insertion air pipe; 14. Sliding rail; 15. Actuating chamber; 16. Nitrogen filling pipe; 17. Ejection air rod; 18. Vacuum pump; 19. Ejection support rod; 20. Sealing seat; 21. Sliding rod; 22. Upper outlet; 23. Flow guide nozzle assembly; 24. Output shaft; 25. Clamping rod; 26. Miniature air pump; 27. Guide limit plate; 28. Sliding protrusion; 29. ​​Sealing heating element; 30. Ridge airbag; 31. Pressure reducing and flow stabilizing valve; 32. Isolation seat; 33. Miniature electronic vent valve; 34. Clamping ear; 35. Sealing groove; 36. Tea leaves. Detailed Implementation

[0032] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. This utility model can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of this utility model. Furthermore, the accompanying drawings of this utility model are for simple illustrative purposes only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this utility model in detail, but the disclosed content is not intended to limit the scope of protection of this utility model.

[0033] according to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, this embodiment provides a vacuum nitrogen filling and automatic packaging machine for tea leaves (36), including a tea dispensing hopper 3, a frame 1, a processing plate 2, at least two processing chambers disposed within the processing plate 2, a packaging bag 5, a steering component, a vacuum component, a nitrogen filling component, and a sealing component. The processing chambers are disposed below the dispensing path of the tea dispensing hopper 3 to form a dispensing station. The vacuum component, nitrogen filling component, and sealing component are respectively disposed on one side of the processing chamber. The steering component drives the processing plate 2 to rotate between the dispensing station and the sealing station. The vacuum component and the nitrogen filling component are mounted on the sealing component and share the same dual-channel insertion tube 13. The dual-channel insertion tube 13 is inserted into the packaging bag 5. The upper channel of the dual-channel insertion tube 13 is connected to the vacuum component and removes gas from the bag. The lower channel of the dual-channel insertion tube 13 is connected to the nitrogen source of the nitrogen filling component and fills the bag with high-purity nitrogen after the vacuum is removed. The upper and lower channels of the tube are controlled by independent gas valves, and there is a height difference between the upper and lower outlets.

[0034] The integrated vacuum nitrogen filling and automatic packaging machine for tea leaves also includes a power supply device and a central processing unit. The power supply device is electrically connected to the steering component, vacuum component, nitrogen filling component, sealing component and central processing unit respectively, and is used to provide a stable working power supply for each component and the central processing unit. The central processing unit is connected to the steering component, vacuum component, nitrogen filling component, and sealing component respectively. It is used to receive the operating status signals and sensor feedback information of each component and output control commands to coordinate each component to work in a set sequence.

[0035] Optionally, the dual-channel insertion tube 13 is provided with a flexible sealing sleeve on its outer side, which is made of high-temperature resistant silicone material. At the same time, the flexible sealing sleeve utilizes the high elasticity and high-temperature resistance of silicone material to automatically adapt to the diameter changes of packaging bags 5 of different thicknesses, providing cushioning when the tube is withdrawn and preventing the bag opening from being scratched or deformed.

[0036] The integrated vacuum nitrogen filling and automatic packaging machine for tea leaves (36) also includes a placement seat 10, which is disposed on the processing plate 2. The vacuum component and the nitrogen filling component are disposed on the placement seat 10; wherein, as shown... Figure 3 As shown, the front and rear outer walls of the placement seat 10 are provided with ejection rails 11, and the ejection rails 11 are set in a direction perpendicular to the upper surface of the processing plate 2.

[0037] In this embodiment, the ejection direction is set to be perpendicular to the upper surface of the processing plate 2.

[0038] In addition, such as Figure 4 The placement base 10 is provided with a vacuum placement cavity and a nitrogen-filled storage cavity on its front and rear sides, respectively, and the vacuum component and the nitrogen-filled component are stored in the vacuum placement cavity and the nitrogen-filled storage cavity, respectively.

[0039] Optionally, the sealing component includes a sealing seat 20, a sealing plate, a sliding block 7 disposed on the sealing plate, a sealing heating element 29, a clamping rod 25, a clamping drive mechanism, a sealing air pump 4, and an actuating air rod 12. The sealing seat 20 has a hollow actuating cavity 15. The clamping rod 25 is drivenly connected to the clamping drive mechanism to form a clamping part. The output end 6 of the clamping part is connected to the sealing plate to form a clamping part. The clamping part is disposed on the front and rear sides of the actuating cavity 15. The sealing plate also has a sliding track 14. The sliding block 7 is slidably connected to the sliding track 14. The output end 6 of the actuating air rod 12 is connected to the sliding block 7. The sealing air pump 4 is connected to the air inlet pipe of the actuating air rod 12 through a pipe. The sealing heating element 29 is disposed on the contact end surface between the sliding block 7 and the edge of the packaging bag 5.

[0040] like Figure 5 As shown, the clamping rod 25 is configured as a telescopic structure, preferably a hydraulic rod, and the clamping drive mechanism uses hydraulic drive to drive the clamping rod 25 to extend and retract. In this embodiment, those skilled in the art can select a suitable model based on the supply chain manufacturer, therefore, further details are omitted in this embodiment.

[0041] During the process of the clamping drive mechanism driving the clamping rod 25 to extend and retract, the clamping ears 34 of the packaging strip are clamped from both sides of the packaging strip.

[0042] like Figure 9 As shown, the packaging strap includes a bag body and two clamping ears 34.

[0043] After the packaging bag 5 is loaded into the action chamber 15, the opening of the packaging bag 5 is opened and tea leaves from the tea feeding hopper 3 are put into the packaging bag 5. After the vacuuming component, nitrogen filling component, and dual-channel insertion air pipe 13 are used to perform vacuuming and nitrogen filling operation on the packaging bag 5, the opening of the bag is then sealed by the sealing component.

[0044] Optionally, the steering component includes a rotation drive mechanism and at least two positioning markers, which are disposed in the delivery station and the sealing station. The output shaft 24 of the rotation drive mechanism is coaxially disposed and connected to the axis of the processing plate 2.

[0045] The rotation drive mechanism is a servo motor or a stepper motor. The output shaft 24 is connected to the processing plate 2. A support bearing is provided below the turntable to stabilize the balance and coaxiality of the processing plate 2 during rotation.

[0046] The positioning marker includes a photoelectric sensor or a magnetic detection component. The positioning marker is used to detect the station angle position of the processing plate 2 and to determine whether the processing plate 2 has reached the predetermined station based on the detection signal, thereby achieving precise positioning and automatic stopping. The detection component is fixedly installed below the frame 1 or the sealing station, and the marker is set on the lower surface of the edge of the processing plate 2 or the turntable. When the processing plate 2 rotates to the predetermined angle, the marker and the detection component cooperate to output a station arrival signal.

[0047] In this embodiment, the detection component is fixedly installed below the sealing station. On the lower surface of the edge of the marking component processing plate 2, when the processing plate 2 rotates to a predetermined angle, the marking component and the detection component cooperate accordingly to output a station arrival signal.

[0048] During the rotation process, the control system first shuts down the action mechanisms of the sealing component and the vacuum / nitrogen filling component. After confirming that the placement station is closed, it drives the rotation drive mechanism to start, driving the processing plate 2 to rotate clockwise by a preset angle (e.g., 180° or 90°). When the next positioning marker signal is detected, it automatically stops and locks, realizing precise switching between the placement station and the sealing station.

[0049] The motor used in the rotation drive mechanism is a stepper motor.

[0050] The dual-channel insertion air tube 13 is also provided with sliding rods 21 and ejection support rods 19 on both sides. The sliding rods 21 are symmetrically arranged on both sides of the dual-channel insertion air tube 13, and one end of the sliding rod 21 is connected to the outer wall of the dual-channel insertion air tube 13, while the other end of the sliding rod 21 is slidably connected to the ejection track 11 provided on the outer wall of the placement seat 10.

[0051] Optionally, the sealing component further includes an ejector air rod 17 and an ejector air pump. The air inlet of the ejector air rod 17 is connected to the ejector air pump pipeline, and the output end 6 of the ejector air rod 17 is positioned directly opposite the dual-channel insertion air pipe 13 (the sealing operation is triggered immediately after vacuuming and nitrogen filling).

[0052] The ejection air pump is mounted on the frame 1 (not shown in the figure), and the trigger end of the ejection air rod 17 is located below the ejection support rod 19. When the dual-channel insertion air tube 13 needs to be ejected, it needs to be pulled out of the packaging bag 5 for a short time. After being pulled out, the bag opening is sealed by the sliding block 7 and the sealing heating element 29 to achieve a sealing effect.

[0053] When the ejector air pump triggers the ejector air rod 17 to perform the ejection action, it is set to 0.5~0.1 seconds to quickly withdraw, so that the nitrogen filling operation is still in progress, and to ensure that the ejection is done in a short time or instant, thereby improving the speed and reliability of the reaction.

[0054] During this process, the sliding rod 21 is guided along the ejection track 11 to the extraction path, and the ejection support rod 19 provides lateral support to prevent the air tube from deflecting.

[0055] To prevent the packaging bag 5 from shaking or air from being sucked back when the trachea is withdrawn, a guide limiting plate 27 is provided on the outer periphery of the trachea. The guide limiting plate 27 is a flexible elastic sheet. After the dual-channel insertion trachea 13 is ejected, the guide limiting plate 27 restricts the placement position of the dual-channel insertion trachea 13 in the packaging bag 5 to prevent it from being scratched. Specifically, one end of the elastic sheet is fixed to the placement seat 10, and the other end can elastically deform when the trachea moves.

[0056] Due to its elastic material, after the dual-channel insertion air tube 13 completes the vacuuming and nitrogen filling operations and is ejected by the ejector rod 17, the elastic sheet immediately returns to its original shape after the air tube is removed (e.g., Figure 3 The y-position in the packaging bag forms a natural barrier to the trachea insertion port, thereby restricting the trachea from being reinserted into the packaging bag 5 and preventing it from accidentally entering the bag opening or tearing the bag.

[0057] Before vacuuming and nitrogen filling the next packaging bag 5, the guide limit plate 27 can be folded in a manual or mechanical reset manner (e.g., ...). Figure 3 (x position in the diagram) to reopen the tracheal insertion path.

[0058] In this process, after the air tube is completely detached from the bag opening, the sealing component, through the coordinated action of the sliding block 7 and the sealing heating element 29, immediately heat-seales the bag opening, achieving a high airtightness. By setting the above-mentioned ejection structure, the dual-channel inserted air tube 13 can be quickly and stably removed after the vacuuming and nitrogen filling operations are completed. The removal action is instantaneously driven by the ejector rod 17 and guided by the sliding rail 14, ensuring that the air tube remains stable during the removal process and does not scrape the bag.

[0059] Meanwhile, the automatic rebound sealing structure of the flexible guide limiting plate 27 can form a short-term sealed buffer zone after the air tube is withdrawn, preventing air backflow or nitrogen leakage from the bag. It can also be automatically linked with the heating and sealing action of the sealing component, so that the sealing operation is completed in an inert atmosphere, which significantly improves the sealing airtightness and packaging preservation effect.

[0060] Compared with existing technologies, this structure has advantages such as fast response, accurate positioning, anti-burden bag, low residual oxygen and high automation, which improves the safety and efficiency of the tea packaging process.

[0061] Optionally, the vacuum component includes a vacuum pump 18 and a vacuum pipe 9, wherein the vacuum nozzle of the vacuum pump 18 is connected to the upper channel pipe of the dual-channel insertion air pipe 13 through the vacuum pipe 9.

[0062] The vacuum component also includes a vacuum control valve and a negative pressure detection sensor. A controllable solenoid valve is installed on the vacuum pipe 9 to control the start and stop sequence of vacuum pumping. The negative pressure detection sensor is used to detect the vacuum level inside the packaging bag 5 and feed the signal back to the central processing unit. In addition, a flow-limiting throttling valve is also provided on the vacuum pipe 9 to slow down the pumping rate and prevent the bag from collapsing or deforming.

[0063] By cooperating with the steering component and the vacuum component, the packaging bag 5 remains stable during vacuum operation and station switching, preventing the bag from collapsing or the tea leaves 36 from being deformed due to uneven negative pressure, and ensuring the packaging shape and flatness.

[0064] Optionally, the nitrogen filling component includes a nitrogen source, a pressure reducing and flow stabilizing valve 31, a gas switching solenoid valve, a filter, and a flow guiding nozzle assembly 23. The nitrogen source is connected to the input end of the solenoid valve through the pressure reducing and flow stabilizing valve 31. The output end 6 of the solenoid valve is connected to the lower channel of the dual-channel insertion gas pipe 13 through the nitrogen filling pipe 16. The flow guiding nozzle assembly 23 is disposed at the outlet end of the lower channel. The filter is disposed between the pressure reducing and flow stabilizing valve 31 and the solenoid valve to filter nitrogen impurities, thereby maintaining a stable airflow and a clean atmosphere during the nitrogen filling stage. The flow guide nozzle assembly 23 includes a central nozzle and an annular flow guide hole. The central nozzle is used to inject high-purity nitrogen into the packaging bag 5, and the annular flow guide hole is used to form a guiding airflow along the bag wall to achieve full replacement of gas inside the bag and uniform distribution of nitrogen.

[0065] The nitrogen filling component also includes a pressure sensor and an anti-backflow valve. The pressure sensor is installed on the pipe section between the pressure reducing and stabilizing valve 31 and the solenoid valve to monitor the nitrogen supply pressure in real time and feed the signal back to the central processing unit. The anti-backflow valve is set on the side of the nitrogen filling pipe 16 near the nitrogen source to prevent gas or moisture inside the packaging bag 5 from flowing back into the nitrogen supply system, thereby ensuring that the nitrogen filling process is stable, safe and the atmosphere is clean.

[0066] By sequentially coordinating vacuum components and nitrogen-filling components, efficient switching between vacuum extraction and nitrogen replacement is achieved, significantly reducing the residual oxygen content inside the bag and improving the long-term preservation performance of tea 36.

[0067] Optionally, the sealing component includes a nitrogen gas curtain 8 outside the sealing seat 20. The gas curtain is connected to the nitrogen source of the nitrogen filling component and continuously releases a small amount of nitrogen into the sealing area during the sealing stage to form a local inert atmosphere.

[0068] Among them, such as Figure 2As shown, the air curtain is a semi-enclosed structure. One end of the nitrogen air curtain 8 is connected to the upper surface of the processing plate 2, and the other end of the air curtain extends outwards towards the side of the dual-channel insertion air pipe 13. Nitrogen gas is obliquely sprayed towards the sealing area through multiple guide holes or nozzles provided on the inner wall of the air curtain, so as to form a stable airflow barrier on the outer periphery of the sealing area, preventing external air from entering and ensuring heat dissipation and working space in the heat sealing area. The guide holes are connected to a nitrogen source through a nitrogen supply pipe.

[0069] The nitrogen gas curtain 8 is made of heat-resistant engineering plastic. The inner wall of the nitrogen gas curtain 8 is provided with a flow divider to evenly distribute the nitrogen flow rate, so that the airflow forms a balanced inert protective layer on both sides of the sealing area.

[0070] Through the synergistic effect of the sealing components and the nitrogen-filling components, the sealing area is heat-sealed under an inert atmosphere, avoiding air backflow and oxidation residue, and improving the airtightness and sealing strength of the seal.

[0071] Optionally, the sliding block 7 is provided with a sealing groove 35 for placing one end of the packaging bag 5 along its edge, and the sealing groove 35 extends along the length of the sliding block 7.

[0072] like Figure 10 As shown, the sliding block 7 has a sliding protrusion 28 on the side facing the sliding track 14, and the sliding protrusion 28 is slidably connected to the sliding track 14.

[0073] When the packaging bag 5 is placed in the action cavity 15, the two clamping ears 34 of the packaging bag 5 are clamped between the clamping parts, so that the clamping ears 34 of the two packaging bags 5 can remain in an upright state.

[0074] Meanwhile, the edge of the packaging bag 5 is wedged into the sealing groove 35, and after the sealing command is issued, the sealing air pump 4 is triggered to drive the actuating air rod 12 to retract, and the sliding block 7 slides along the direction of the sliding track 14. During the sliding process, the edge of the packaging bag 5 is gradually sealed.

[0075] By combining the nitrogen filling component with the sealing component, the nitrogen filling process is directed within the sealing station, achieving uniform gas replacement inside the bag, avoiding localized high residual oxygen levels, and ensuring uniform nitrogen distribution and stable preservation effect.

[0076] Optionally, the sealing groove 35 is provided with a raised airbag 30, a micro air pump 26, and an isolation seat 32. The micro air pump 26 inflates the raised airbag 30 through a restart pipe. The raised airbag 30 is located on the bottom wall of the sealing groove 35. The isolation seat 32 is located on the side of the raised airbag 30 facing the packaging bag 5. The sealing heating element 29 is located on the isolation seat 32. Flexible heat sealing is achieved by the elastic inflation of the airbag, preventing uneven heating or damage to the bag. The raised airbag 30 is provided with a micro electronic vent valve 33, which is connected to the inner wall of the raised airbag 30 and electrically connected to the central processing unit.

[0077] During the movement of the sliding block 7, the raised airbag 30 in the sealing groove 35 begins to inflate and gradually bulges, causing the isolation seat 32 above the airbag to drive the sealing heating element 29 to press upward against the edge of the packaging bag 5. The sealing heating element 29 heats up rapidly after being powered on and comes into contact with the heat-sealing area of ​​the bag. As the sliding block 7 moves, it forms a continuous heat-pressure seal, thereby achieving sequential sealing of the bag opening edge.

[0078] When the sliding block 7 reaches the end of its stroke, the actuating air rod 12 enters a constant pressure holding state, maintaining a sealing pressure of 0.2–0.4 MPa for 1–2 seconds to ensure sufficient plastic fusion at the heat seal. Subsequently, the micro-inflation pump 26 is turned off, and the gas in the raised airbag 30 is released through the micro-electronic vent valve 33, the sealing groove 35 resets, and the sealing cycle is completed. The raised airbag 30 provides flexible pressure, ensuring that the sealing heating element 29 fully adheres to the edge of the bag. The sliding block 7 moves along its length to form a linear heat sealing band, achieving a stable seal at the bag opening while maintaining constant pressure and temperature. The above-mentioned sealing operation can avoid charring of the seal, uneven indentation or gas leakage, and significantly improve the airtightness and sealing consistency of the tea 36 packaging bag 5.

[0079] Through the coordinated operation of the steering component, vacuum component, nitrogen filling component, and sealing component, the equipment maintains stable packaging bag, uniform airflow, low residual oxygen, and tight sealing throughout the vacuum, nitrogen filling, and sealing process. This gives the equipment a comprehensive advantage of high freshness preservation, high sealing performance, and high automation efficiency.

[0080] The above-disclosed content is only a preferred and feasible embodiment of the present utility model, and is not intended to limit the protection scope of the present utility model. Therefore, all equivalent technical changes made based on the contents of the present utility model specification and drawings are included within the protection scope of the present utility model. Furthermore, the elements therein can be updated as technology develops.

Claims

1. A vacuum nitrogen-filling and automatic packaging machine for tea, comprising a tea feeding hopper, characterized in that, It also includes a frame, a processing plate, at least two processing cavities disposed within the processing plate, a packaging bag, a steering component, a vacuum component, a nitrogen-filling component, and a sealing component. The processing cavities are disposed below the tea dispensing path of the tea dispensing hopper to form a dispensing station. The vacuum component, nitrogen-filling component, and sealing component are respectively disposed on one side of the processing cavity. The steering component drives the processing plate to rotate between the dispensing station and the sealing station. The vacuum component and the nitrogen filling component are mounted on the sealing component and share the same dual-channel insertion tube. The dual-channel insertion tube is inserted into the packaging bag. The upper channel of the dual-channel insertion tube is connected to the vacuum component and removes gas from the bag. The lower channel of the dual-channel insertion tube is connected to the nitrogen source of the nitrogen filling component and fills the bag with high-purity nitrogen after the vacuum is removed. The upper and lower channels of the tube are controlled by independent gas valves, and there is a height difference between the upper and lower outlets.

2. The integrated machine for vacuum nitrogen filling and automatic packaging of tea leaves according to claim 1, characterized in that, The sealing component includes a sealing seat, a sealing plate, a sliding block disposed on the sealing plate, a sealing heating element, a clamping rod, a clamping drive mechanism, a sealing air pump, and an actuating air rod. The sealing seat has a hollow actuating cavity. The clamping rod is drivenly connected to the clamping drive mechanism to form a clamping part. The output end of the clamping part is connected to the sealing plate to form a clamping part. The clamping part is disposed on the front and rear sides of the actuating cavity. The sealing plate also has a sliding track. The sliding block is slidably connected to the sliding track. The output end of the actuating air rod is connected to the sliding block. The sealing air pump is connected to the air inlet pipe of the actuating air rod through a pipe. The sealing heating element is disposed on the contact end face between the sliding block and the edge of the packaging bag.

3. The integrated machine for vacuum nitrogen filling and automatic packaging of tea leaves according to claim 2, characterized in that, The sealing component also includes an ejector air rod and an ejector air pump. The air inlet of the ejector air rod is connected to the ejector air pump pipe, and the output end of the ejector air rod is positioned opposite the dual-channel insertion air pipe.

4. The integrated machine for vacuum nitrogen filling and automatic packaging of tea leaves according to claim 3, characterized in that, The steering component includes a rotation drive mechanism and at least two positioning markers. The at least two positioning markers are disposed in the delivery station and the sealing station. The output shaft of the rotation drive mechanism is coaxially disposed and connected to the axis of the processing plate.

5. The integrated machine for vacuum nitrogen filling and automatic packaging of tea leaves according to claim 4, characterized in that, The vacuum component includes a vacuum pump and a vacuum pipe, and the vacuum nozzle of the vacuum pump is connected to the upper channel pipe of the dual-channel insertion air pipe through the vacuum pipe.

6. The integrated machine for vacuum nitrogen filling and automatic packaging of tea according to claim 5, characterized in that, The nitrogen filling component includes a nitrogen source, a pressure reducing and flow stabilizing valve, a gas switching solenoid valve, a filter, and a flow guiding nozzle assembly. The nitrogen source is connected to the input end of the solenoid valve through the pressure reducing and flow stabilizing valve. The output end of the solenoid valve is connected to the lower channel of the dual-channel insertion gas pipe through a nitrogen filling pipe. The flow guiding nozzle assembly is located at the outlet end of the lower channel. The filter is located between the pressure reducing and flow stabilizing valve and the solenoid valve. The flow guide nozzle assembly includes a central nozzle and an annular flow guide hole. The central nozzle is used to inject high-purity nitrogen into the packaging bag, and the annular flow guide hole is used to form a guiding airflow along the bag wall.

7. The integrated machine for vacuum nitrogen filling and automatic packaging of tea leaves according to claim 6, characterized in that, The sealing component includes a nitrogen gas curtain hood outside the sealing seat. The gas curtain hood is connected to the nitrogen source of the nitrogen filling component and continuously releases a small amount of nitrogen into the sealing area during the sealing stage to form a local inert atmosphere.

8. The integrated machine for vacuum nitrogen filling and automatic packaging of tea according to claim 6 or 7, characterized in that, The sliding block is provided with a sealing groove for placing one end of the packaging bag along its edge, and the sealing groove extends along the length of the sliding block.

9. The integrated machine for vacuum nitrogen filling and automatic packaging of tea according to claim 8, characterized in that, The sealing groove is equipped with a ridge-forming airbag, a miniature air pump, and an isolation seat. The miniature air pump inflates the ridge-forming airbag through a restart pipe. The ridge-forming airbag is located on the bottom wall of the sealing groove. The isolation seat is located on the side of the ridge-forming airbag facing the packaging bag. The sealing heating element is located on the isolation seat.

10. The integrated machine for vacuum nitrogen filling and automatic packaging of tea according to claim 9, characterized in that, The dual-channel insertion endotracheal tube is equipped with a flexible sealing sleeve on the outside, which is made of high-temperature resistant silicone material.

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