Plug filling and nitrogen filling head structure

Abstract

The utility model relates to a kind of plug filling nitrogen head structure. Including filling nitrogen head body, inside is formed with the first passageway passing through bottom, respectively with first vacuum air path and nitrogen gas path intercommunication, first vacuum air path is configured to carry out vacuumizing operation to container inside, nitrogen gas path is configured as to fill into nitrogen gas in container;Plug rod, inside is formed with the second passageway passing through bottom, with second vacuum air path intercommunication, second vacuum air path is configured to carry out vacuumizing to plug rod inside, for the sealing assembly of plug rod bottom suction and container mouth sealing of container, the lower end of plug rod and filling nitrogen head body movably connect, upper end and driving mechanism connect, under the driving of driving mechanism, plug rod moves in the first passageway inside filling nitrogen head body, to seal sealing assembly in container mouth, first vacuum air path and nitrogen gas path are integrated in filling nitrogen head body, realize the continuous operation of vacuumizing in container and filling nitrogen;Stable fixed sealing assembly by vacuum adsorption, improve sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment parts technology, and in particular to a nitrogen filling head structure. Background Technology

[0002] In the food, pharmaceutical, and chemical industries, vacuum nitrogen filling and sealing of containers is a common packaging process aimed at extending product shelf life by replacing the air inside the container. Existing nitrogen filling and sealing equipment typically uses an integrated nitrogen filling head structure, combining the stopper pressing and nitrogen filling processes. However, this approach suffers from the following technical problems: Insufficient positioning accuracy of sealing components: Traditional stopper rods often fix sealing components such as stoppers using mechanical snap-fits or direct pressing, which can easily lead to misalignment between the sealing components and the container opening due to mechanical errors, resulting in incomplete sealing or the risk of bottle breakage. Low integration of gas path functions: The gas path control for nitrogen filling and stoppering processes is independent, requiring separate operations (e.g., first vacuuming, then manually placing the stopper, and finally filling with nitrogen). This process is cumbersome and prone to introducing external air interference, affecting nitrogen filling efficiency and residual oxygen control. Poor component adaptability: For containers of different sizes, the entire nitrogen filling head structure needs to be replaced, especially the installation method of the sealing components, which lacks flexibility, leading to high equipment debugging costs and low production efficiency. Utility Model Content

[0003] In view of the above-mentioned shortcomings of current nitrogen filling equipment, this utility model provides a stoppered nitrogen filling head structure. The first vacuum path and the nitrogen path are integrated into the nitrogen filling head body to realize continuous operation of vacuuming and nitrogen filling in the container. The second vacuum path acts independently on the stopper rod, and stabilizes and fixes the sealing component through vacuum adsorption, avoiding positioning deviation caused by mechanical contact and improving sealing reliability.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A nitrogen filling head structure is provided for filling a container with nitrogen, comprising:

[0006] The nitrogen filling head body has a first channel that runs through the bottom inside, which is connected to a first vacuum passage and a nitrogen passage respectively. The first vacuum passage is configured to perform a vacuum operation inside the container, and the nitrogen passage is configured to fill the container with nitrogen.

[0007] The stopper rod has a second channel extending through the bottom and communicating with a second vacuum passage. The second vacuum passage is configured to evacuate the inside of the stopper rod so that the bottom of the stopper rod can adhere to the sealing assembly that seals the container opening. The lower end of the stopper rod is movably connected to the nitrogen filling head body, and the upper end is connected to a drive mechanism. Driven by the drive mechanism, the stopper rod moves within the first channel inside the nitrogen filling head body to seal the sealing assembly at the container opening.

[0008] Optionally, the nitrogen filling head body is provided with a first vacuum interface and a nitrogen interface, the first vacuum interface being connected to the first vacuum path, and the nitrogen interface being connected to the nitrogen path.

[0009] Optionally, the first channel is provided with a branch valve to switch the conduction state of the first vacuum path and the nitrogen path, wherein: during the vacuuming stage, the first vacuum path is open and the nitrogen path is closed; during the nitrogen filling stage, the nitrogen path is open and the first vacuum path is closed.

[0010] Optionally, the drive mechanism is a lead screw device driven by a servo motor, which uses an encoder to provide real-time feedback on the displacement of the stopper rod in order to precisely control the pressing depth of the sealing assembly.

[0011] Optionally, a linear bearing is provided at the movable connection between the stopper rod and the nitrogen filling head body to ensure that the stopper rod moves linearly along the axis of the first channel, avoiding sealing failure caused by misalignment.

[0012] Optionally, the stopper rod is provided with a second vacuum interface, which is connected to the second vacuum air path.

[0013] Optionally, a pressure sensor is integrated into the outer wall of the nitrogen filling head to monitor the gas pressure inside the bottle in real time during the nitrogen filling process and to adjust the nitrogen flow rate in conjunction with the control system.

[0014] Optionally, the bottom of the nitrogen filling head body is provided with an annular buffer pad made of silicone or polyurethane to absorb the impact force when the stopper rod is pressed down and prevent the container opening from breaking.

[0015] Optionally, the bottom of the cushioning pad is provided with a sealing part for sealing the container opening.

[0016] The advantages of this utility model are:

[0017] 1. Dual gas path independent control, precise and coordinated operation: The first vacuum gas path and nitrogen gas path are integrated into the nitrogen filling head body to realize continuous operation of vacuuming and nitrogen filling in the container; the second vacuum gas path acts independently on the stopper rod, and stabilizes and fixes the sealing component through vacuum adsorption, avoiding positioning deviation caused by mechanical contact and improving sealing reliability.

[0018] 2. Flexible connection structure with strong adaptability: The stopper rod is movably connected to the nitrogen filling head body and can move up and down in the first channel. The driving mechanism precisely controls the pressure and position of the stopper, which can ensure that the sealing component fits tightly with the container opening, and the buffer design can prevent excessive pressure from breaking the bottle.

[0019] 3. High degree of automation and reduced manual intervention: The vacuum adsorption function of the second vacuum air path replaces the traditional mechanical buckle, realizing the automatic gripping and placement of sealing components. Combined with the lifting control of the drive mechanism, the entire process of vacuuming, nitrogen filling and plugging can be completed automatically, reducing human operation errors and improving production efficiency and consistency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the nitrogen filling head described in this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the nitrogen filling head body described in this utility model;

[0023] Figure 3 This is a schematic diagram of the stopper rod described in this utility model;

[0024] In the diagram: 1. Nitrogen filling head body; 11. First channel; 12. Nitrogen interface; 13. First vacuum interface; 2. Stopper rod; 21. Second channel; 22. Second vacuum interface; 3. Container; 4. Buffer pad; 5. Drive mechanism; 6. Sealing part. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1:

[0027] like Figures 1-3 As shown, a nitrogen-filling head structure for filling container 3 with nitrogen includes:

[0028] The nitrogen filling head body 1 has a first channel 11 that runs through the bottom inside, which is connected to a first vacuum passage and a nitrogen passage respectively. The first vacuum passage is configured to perform a vacuum operation inside the container 3, and the nitrogen passage is configured to fill the container 3 with nitrogen.

[0029] The stopper rod 2 has a second channel 21 that extends through the bottom and communicates with a second vacuum passage. The second vacuum passage is configured to evacuate the inside of the stopper rod 2 so that the bottom of the stopper rod 2 can adhere to the sealing component that seals the container opening of the container 3. The lower end of the stopper rod 2 is movably connected to the nitrogen filling head body 1, and the upper end is connected to the drive mechanism 5. Under the drive of the drive mechanism 5, the stopper rod 2 moves within the first channel 11 inside the nitrogen filling head body to seal the sealing component at the container opening.

[0030] Specifically, the first channel 11 of the nitrogen filling head body 1 integrates a first vacuum path and a nitrogen path. During vacuuming, the first vacuum path is open to expel air from the container 3; during nitrogen filling, the nitrogen path is open to inject nitrogen. The second channel 21 of the stopper rod 2 generates a vacuum adsorption force through the second vacuum path, adsorbing the sealing component. The drive mechanism 5 drives the stopper rod 2 to move up and down within the first channel 11, precisely pressing the sealing component onto the container opening to complete the seal. The vacuuming and sealing component adsorption functions within the container 3 are separated, avoiding the positioning deviation of traditional mechanical stoppering and improving sealing reliability. The vacuuming, nitrogen filling, and stoppering processes are achieved through the same structure, reducing manual intervention and improving production efficiency.

[0031] Example 2:

[0032] like Figures 1-3 As shown, a nitrogen-filling head structure for filling container 3 with nitrogen includes:

[0033] The nitrogen filling head body 1 has a first channel 11 that runs through the bottom inside, which is connected to a first vacuum passage and a nitrogen passage respectively. The first vacuum passage is configured to perform a vacuum operation inside the container 3, and the nitrogen passage is configured to fill the container 3 with nitrogen.

[0034] The stopper rod 2 has a second channel 21 that extends through the bottom and communicates with a second vacuum passage. The second vacuum passage is configured to evacuate the inside of the stopper rod 2 so that the bottom of the stopper rod 2 can adhere to the sealing component that seals the container opening of the container 3. The lower end of the stopper rod 2 is movably connected to the nitrogen filling head body 1, and the upper end is connected to the drive mechanism 5. Under the drive of the drive mechanism 5, the stopper rod 2 moves within the first channel 11 inside the nitrogen filling head body to seal the sealing component at the container opening.

[0035] Specifically, the first channel 11 of the nitrogen filling head body 1 integrates a first vacuum path and a nitrogen path. During vacuuming, the first vacuum path is open to expel air from the container 3; during nitrogen filling, the nitrogen path is open to inject nitrogen. The second channel 21 of the stopper rod 2 generates a vacuum adsorption force through the second vacuum path, adsorbing the sealing component. The drive mechanism 5 drives the stopper rod 2 to move up and down within the first channel 11, precisely pressing the sealing component onto the container opening to complete the seal. The vacuuming and sealing component adsorption functions within the container 3 are separated, avoiding the positioning deviation of traditional mechanical stoppering and improving sealing reliability. The vacuuming, nitrogen filling, and stoppering processes are achieved through the same structure, reducing manual intervention and improving production efficiency.

[0036] Furthermore, the nitrogen filling head body 1 is provided with a first vacuum interface 13 and a nitrogen interface 12. The first vacuum interface 13 is connected to the first vacuum air path, and the nitrogen interface 12 is connected to the nitrogen gas path. The first vacuum interface 13 and the nitrogen interface 12 of the nitrogen filling head body 1 are respectively connected to an external vacuum pump and a nitrogen gas source. The first vacuum air path and the nitrogen gas path are connected to external equipment through pipelines to form a complete gas path circulation, which facilitates the quick connection and disassembly of the gas path pipelines and supports equipment maintenance and component replacement. The independent interfaces avoid cross-interference of gas paths and ensure the stability of the vacuuming and nitrogen filling process.

[0037] Furthermore, the first channel 11 is equipped with a branch valve for switching the conduction state of the first vacuum path and the nitrogen path, wherein:

[0038] During the vacuuming phase, the first vacuum path is opened and the nitrogen path is closed, using the first vacuum path to purge the air from container 3.

[0039] During the nitrogen charging stage, the branch valve switches to the nitrogen gas path, the nitrogen gas path is opened, the first vacuum path is closed, and nitrogen is injected into container 3 through the first channel 11.

[0040] Precise gas path switching: avoids gas backlash caused by simultaneous vacuuming and nitrogen filling, ensuring efficient gas replacement within container 3;

[0041] Process automation: The branch valves are linked with the control system to achieve automatic switching between vacuuming and nitrogen filling processes, reducing time loss.

[0042] Furthermore, the drive mechanism 5 employs a servo motor-driven lead screw device. The motor rotation is converted into linear motion of the stopper rod 2 via the lead screw. The encoder provides real-time feedback on the displacement of the stopper rod 2, and the control system adjusts the motor speed and stroke based on the feedback signal to precisely control the pressing depth of the sealing component. Encoder feedback enables closed-loop control, and the pressing depth error can be controlled within ±0.1mm, adapting to the sealing pressure requirements of containers 3 of different specifications. Different pressing speeds and pressures can be set via a program to avoid damage to the container 3 caused by rigid contact.

[0043] Furthermore, a linear bearing is provided at the movable connection between the stopper rod 2 and the nitrogen filling head body 1 to ensure that the stopper rod 2 moves linearly along the axial direction of the first channel 11, avoiding sealing failure caused by misalignment. The linear bearing at the connection between the stopper rod 2 and the nitrogen filling head body 1 has its inner ring fitted with the stopper rod 2 and its outer ring fixed to the inner wall of the first channel 11 of the nitrogen filling head body 1, ensuring that the stopper rod 2 moves only linearly along the axial direction and suppressing radial offset.

[0044] Furthermore, the stopper rod 2 is provided with a second vacuum interface 22, which is connected to the second vacuum passage. The second vacuum interface 22 of the stopper rod 2 is connected to an external vacuum pump. A negative pressure is formed inside the stopper rod 2 through the second vacuum passage, causing an adsorption force at the bottom of the stopper rod 2 to stably hold the sealing component (such as a rubber stopper or sealing gasket). Compared with mechanical snap-fit, vacuum adsorption has no contact stress and is suitable for sealing components of different materials (such as soft rubber stoppers and hard plastic caps). By controlling the opening and closing of the second vacuum passage, the automatic gripping and release of the sealing component can be achieved, improving operational flexibility.

[0045] Furthermore, the pressure sensor on the outer wall of the nitrogen filling head 1 monitors the internal pressure of the bottle in real time. After the data is transmitted to the control system, it is compared with the preset pressure threshold, and the valve opening or pump speed of the nitrogen gas path is automatically adjusted to dynamically adjust the nitrogen gas flow rate. This avoids excessively high (bottle breakage) or excessively low (insufficient nitrogen filling) internal pressure caused by unstable nitrogen gas flow rate, ensuring that the residual oxygen content is controlled within the target range (e.g., ≤1%). The pressure feedback and gas path adjustment are linked to adapt to changes in the volume of different containers 3 and nitrogen filling process parameters.

[0046] Furthermore, the annular buffer pad 4 (made of silicone / polyurethane) at the bottom of the nitrogen filling head body 1 comes into contact with the container opening when the stopper rod 2 is pressed down. The material's elastic deformation absorbs the impact force, transforming rigid contact into flexible buffering and reducing instantaneous pressure. The buffer pad 4 can absorb 80%-90% of the downward impact force, preventing the container opening from rupturing due to pressure concentration; the elastic material can adapt to minor dimensional deviations in the container opening, improving the fit of the sealing surface.

[0047] Furthermore, the bottom of the buffer pad 4 is provided with a sealing part 6 for sealing the container opening.

[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A nitrogen-filling head structure for filling containers with nitrogen, characterized in that, include: The nitrogen filling head body has a first channel that runs through the bottom inside, which is connected to a first vacuum passage and a nitrogen passage respectively. The first vacuum passage is configured to perform a vacuum operation inside the container, and the nitrogen passage is configured to fill the container with nitrogen. The stopper rod has a second channel extending through the bottom and communicating with a second vacuum passage. The second vacuum passage is configured to evacuate the inside of the stopper rod so that the bottom of the stopper rod can adhere to the sealing assembly that seals the container opening. The lower end of the stopper rod is movably connected to the nitrogen filling head body, and the upper end is connected to a drive mechanism. Driven by the drive mechanism, the stopper rod moves within the first channel inside the nitrogen filling head body to seal the sealing assembly at the container opening.

2. The nitrogen-filling head structure according to claim 1, characterized in that, The nitrogen filling head body is provided with a first vacuum interface and a nitrogen interface. The first vacuum interface is connected to the first vacuum air path, and the nitrogen interface is connected to the nitrogen air path.

3. The nitrogen-filling head structure according to claim 1, characterized in that, The first channel is equipped with a branch valve for switching the conduction state of the first vacuum path and the nitrogen path, wherein: During the vacuuming phase, the first vacuum path is opened, and the nitrogen path is closed. During the nitrogen charging stage, the nitrogen gas path is opened and the first vacuum path is closed.

4. The nitrogen-filling head structure according to claim 1, characterized in that, The drive mechanism is a lead screw device driven by a servo motor. The displacement of the stopper rod is fed back in real time through an encoder to precisely control the pressing depth of the sealing component.

5. The nitrogen-filling head structure according to claim 1, characterized in that, The stopper rod is equipped with a linear bearing at the movable connection between the stopper rod and the nitrogen filling head body to ensure that the stopper rod moves linearly along the axis of the first channel, thus avoiding sealing failure caused by misalignment.

6. The nitrogen-filling head structure according to claim 1, characterized in that, The stopper rod is equipped with a second vacuum interface, which is connected to the second vacuum air path.

7. The nitrogen-filling head structure according to claim 1, characterized in that, The outer wall of the nitrogen filling head integrates a pressure sensor to monitor the gas pressure inside the bottle in real time during the nitrogen filling process, and to adjust the nitrogen flow rate in conjunction with the control system.

8. The nitrogen-filling head structure according to claim 1, characterized in that, The bottom of the nitrogen filling head is equipped with an annular buffer pad made of silicone or polyurethane to absorb the impact force when the stopper rod is pressed down, preventing damage to the container opening.

9. The nitrogen-filling head structure according to claim 8, characterized in that, The bottom of the buffer pad is provided with a sealing part for sealing the container opening.

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