Auxiliary cover mechanism, vacuumizing and nitrogen charging module, all-in-one machine and working method

Abstract

The invention relates to the technical field of food packaging, in particular to an auxiliary cover mechanism, a vacuumizing and nitrogen filling module, an all-in-one machine and a working method.The auxiliary cover mechanism blocks a can opening of a can body in the can body vacuumizing and nitrogen filling process and comprises a power device; the at least one auxiliary cover realizes covering and opening actions relative to the can opening; the auxiliary cover comprises a first channel and a second channel, the first channel is communicated with the inside and the outside of the tank body through the first inner port and the first outer port, and the second channel is communicated with the inside and the outside of the tank body through the second inner port and the second outer port. In the vacuumizing process, through the arrangement of the two channels, the working mode that powder materials in the tank body are effectively prevented from flying and overflowing can be obtained, negative pressure can be obtained in the vacuum box and then transmitted into the tank body through the establishment of the second channel, vacuumizing operation can be executed through the first channel as well, the pressure relation between the interior of the tank body and the interior of the vacuum box can be redefined, and the vacuumizing efficiency is improved. And the trend that the powder material in the tank body is dispersed into the vacuum box is inhibited.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of food packaging, in particular to an auxiliary cover mechanism, a vacuum and nitrogen filling module, an all-in-one machine and a working method. BACKGROUND

[0002] In the production process of milk powder products, in order to prolong the shelf life of the product, prevent oxidation and deterioration, inhibit the growth of aerobic microorganisms, and maintain the physical state of the milk powder, a vacuum and nitrogen filling process is usually carried out after the milk powder is filled into the tank. This process aims to remove as much air as possible from the tank and fill high-purity nitrogen gas to form an inert gas protection environment.

[0003] In the existing vacuum and nitrogen filling process, it is inevitable to form gas flow in the tank. During the flow process, fine milk powder particles in the upper layer of the tank and near the tank opening are easily entrained, causing the powder to scatter and escape, resulting in material loss, equipment contamination and product quality risk. SUMMARY

[0004] The present application provides an auxiliary cover mechanism, a vacuum and nitrogen filling module, an all-in-one machine and a working method, which can effectively solve the problems in the background art.

[0005] In order to achieve the above purpose, the technical solution adopted by the present application is: The auxiliary cover mechanism seals the tank opening of the tank during the vacuum and nitrogen filling process of the tank, comprising: a power device; at least one auxiliary cover, which is powered by the power device and can be closed and opened relative to the tank opening; The auxiliary cover comprises a first channel and a second channel, and the first channel is connected to the inside and outside of the tank through inner port one and outer port one, respectively, and the second channel is connected to the inside and outside of the tank through inner port two and outer port two, respectively.

[0006] Further, it further comprises a gap adjustment structure covering the inner port one and controlling the first flow gap between the first channel and the inside of the tank; and covering the inner port two and controlling the second flow gap between the second channel and the inside of the tank.

[0007] Further, the auxiliary cover comprises a rod body and a cover body, the cover body is connected with the power device through the rod body, the first channel is connected to the inside and outside of the tank through the inside of the rod body, and the second channel is connected to the inside and outside of the tank on the cover body.

[0008] Further, the rod body is vertically connected to the middle part of the cover body, the second channel is distributed with at least three, and is uniformly distributed around the rod body.

[0009] Further, the gap adjustment structure is provided with the inner port one and the inner port two, and the end surface gradually converges from bottom to top, and the positions of the inner port one and the inner port two on the cover correspond to the concave gradually converging from bottom to top; The end surface and the concave obtain a uniform overall gap, and the first flow gap and the second flow gap are contained therein.

[0010] The vacuum and nitrogen filling module includes the auxiliary cover mechanism as described above, and further includes: A vacuum box is provided with an open end for the tank to enter or exit; A gate and a gate power, the gate is closed or opened to the open end under the action of the gate power; The power device of the auxiliary cover mechanism is installed outside the vacuum box, the inner port one of the first channel is located inside the vacuum box, the outer port one is located outside the vacuum box, and the inner port two and the outer port two of the second channel are located inside the vacuum box.

[0011] Further, it further includes: A negative pressure tank is connected to the inside of the vacuum box through a first pipeline, and is connected to the outer port one through a second pipeline; A vacuum pump is connected to the inside of the negative pressure tank through a third pipeline.

[0012] The working method of the vacuum and nitrogen filling module as described above, during the vacuumization process in the inside of the tank, includes: Directly vacuumizing the inside of the tank through the first channel; And, vacuumizing the inside of the vacuum box to indirectly vacuumize the inside of the tank through the second channel; The vacuum degree of the inside of the vacuum box is kept less than or equal to the vacuum degree of the inside of the tank.

[0013] An all-in-one machine includes: A filling module fills the powder material into the tank; The vacuum and nitrogen filling module as described above synchronously and sequentially performs vacuumization and nitrogen filling operations on the filled tanks; A low-oxygen MAP maintaining module provides a low-oxygen space with an oxygen content below a set value for the tanks from the vacuum and nitrogen filling module; A sealing module is installed in the low-oxygen space to realize cover installation for each tank; A transfer module realizes the transfer of the tank between the filling module, the vacuum and nitrogen filling module, and the low-oxygen MAP maintaining module.

[0014] The working method of the all-in-one machine as described above includes: filling the tank body with powder material to obtain a desired filling amount; synchronously sending a plurality of filled tank bodies into the vacuum box, and plugging the tank openings of the tank bodies; synchronously performing vacuumizing and nitrogen filling operations on the filled tank bodies; unplugging the tank openings, and sending the tank bodies into the low-oxygen space; installing lids on the tank bodies in the low-oxygen space.

[0015] The technical scheme of the present application can achieve the following technical effects: In the vacuumizing process, the double-channel arrangement can effectively avoid the scattering and overflow of the powder material in the tank body. When the tank body is being vacuumized in the vacuum box, the second channel can transmit the negative pressure in the vacuum box to the tank body after the vacuum box is under negative pressure, thereby indirectly realizing the vacuumizing process in the tank body, which can avoid the direct impact of high-speed airflow on the powder. In this process, the fine milk powder particles in the upper layer of the tank and near the tank opening will move under the action of the airflow. In order to avoid the dispersion of this part of the powder material, the first channel can simultaneously play the following dual roles: The first channel can also perform vacuumizing operation, thereby making the vacuumizing process in the tank body more efficient. At the same time, the vacuum degree established by the first channel in the tank body can redefine the pressure relationship between the tank body and the vacuum box. As long as the vacuum degree inside the vacuum box is less than or equal to the vacuum degree inside the tank body, that is, the pressure inside the vacuum box is greater than or equal to the pressure inside the tank body, the tendency of the powder material in the tank body to disperse into the vacuum box can be inhibited during the vacuumizing process.

[0016] The all-in-one machine can effectively ensure the accuracy of the amount of powder material in the tank body during the entire filling, vacuumizing and nitrogen filling process. The use of the vacuumizing and nitrogen filling module and the low-oxygen MAP maintaining module can effectively meet the residual oxygen amount index in the final product for various personalized product packaging. The filled tank bodies are synchronously vacuumized and nitrogen filled, and the lid installation is performed in the low-oxygen MAP maintaining module according to the set production rhythm, which can realize low-speed production for diversified small-batch production design. The modular filling, vacuumizing and nitrogen filling all-in-one machine in the present application can adapt to rapid specification switching. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 This is a front view of the auxiliary cover mechanism; Figure 2 A sectional view of the auxiliary cover mechanism; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 A schematic diagram of the vacuuming and nitrogen-filling module; Figure 5 for Figure 4 A magnified view of a section at point B in the middle; Figure 6 A partial structural diagram of the vacuuming and nitrogen-filling module; Figure 7 This is a schematic diagram of a part of the structure of an all-in-one machine; Figure 8 This is a schematic diagram of another part of the all-in-one machine; Figure 9 A flowchart of the workflow for an all-in-one machine; Reference numerals: 1. Power unit; 2. Auxiliary cover; 21. First channel; 21a. Inner port one; 21b. Outer port one; 22. Second channel; 22a. Inner port two; 22b. Outer port two; 23. Rod; 24. Cover; 3. Tank; 4. Gap adjustment structure; 5. Vacuum box; 51. Air-expanded sealing ring; 6. Gate; 7. Gate power; 9. Filling module; 10. Low oxygen MAP maintenance module; 11. Transfer module. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1: like Figures 1-3 As shown, the auxiliary cover mechanism seals the opening of tank 3 during the vacuuming and nitrogen filling process of tank 3, including: The power unit 1, in this embodiment, can be a conventional linear power unit such as a cylinder or an electric cylinder; at least one auxiliary cover 2, the specific number of which is set according to the number of corresponding tanks 3, and the closing and opening actions are realized relative to the tank opening by the power from the power unit 1.

[0021] The auxiliary cover 2 includes a first channel 21 and a second channel 22. The first channel 21 connects the inside and outside of the tank body 3 through an inner port 21a and an outer port 21b, respectively. The second channel 22 connects the inside and outside of the tank body 3 through an inner port 22a and an outer port 22b, respectively.

[0022] The present embodiment provides a new type of auxiliary cover mechanism, in the process of vacuumizing, through the setting of double channels, the working mode of effectively avoiding the scattering of powder materials in the tank 3 can be obtained. Specifically, when the tank 3 is in the vacuum box 5 to perform the vacuumizing operation, the establishment of the second channel 22 can transmit to the tank 3 after obtaining the negative pressure in the vacuum box 5, thereby indirectly realizing the vacuumizing process in the tank 3, which can avoid the direct impact of high-speed airflow on the powder; in this process, the fine milk powder particles in the upper layer of the tank and near the tank opening will often move under the action of the airflow, in order to avoid the dispersion of this part of the powder material, the first channel 21 can simultaneously play the following dual role: The first channel 21 can also perform the vacuumizing operation, so that the vacuumizing process in the tank 3 is more efficient; at the same time, the vacuum degree established in the tank 3 through the first channel 21 can redefine the pressure relationship between the tank 3 and the vacuum box 5, as long as the vacuum degree inside the vacuum box 5 is less than or equal to the vacuum degree inside the tank 3, that is, the pressure inside the vacuum box 5 is greater than or equal to the pressure inside the tank 3, then the trend of the powder material in the tank 3 to the vacuum box 5 can be inhibited during the vacuumizing process.

[0023] In order to further ensure the constraint degree of the powder in the tank 3, as a preferred embodiment of the above, the auxiliary cover mechanism further comprises a gap adjustment structure 4, which covers the inner port 1 21a and controls the first flow-through gap between the first channel 21 and the inside of the tank 3; and covers the inner port 2 22a and controls the second flow-through gap between the second channel 22 and the inside of the tank 3.

[0024] In the present preferred embodiment, the covering mode of the gap adjustment structure 4 can further reduce the possibility of powder material escaping, including escaping from the tank 3 to the vacuum box 5 and escaping from the tank 3 to the outside; the gap adjustment structure 4 can simultaneously realize the control of the first flow-through gap and the second flow-through gap as a complete structure, or can be controlled separately through a split mode, both of which are within the protection scope of the present application; when the first flow-through gap and the second flow-through gap both obtain suitable values, the vacuumizing process and the material can both realize a stable state.

[0025] As a preferred embodiment of the above, the auxiliary cover 2 comprises a rod body 23 and a cover body 24, the cover body 24 is connected with the power device 1 through the rod body 23, the first channel 21 is connected inside the rod body 23 to communicate between the inside and outside of the tank 3, and the second channel 22 is connected on the cover body 24 to communicate between the inside and outside of the tank 3. Through the setting of the rod body 23, the cover body 24 obtains a rigid connection relationship with the power device 1, in this mode, the first channel 21 can obtain relative extension, so that even after part of the powder material enters, a certain material recycling effect can be realized, and the part of the material adsorbed can fall back to the tank 3 in the channel.

[0026] As a further optimization, the rod 23 is vertically connected to the middle of the cover 24, and at least three second channels 22 are distributed evenly around the rod 23. This distribution method can not only ensure the structural and movement stability of the auxiliary cover 2, but also make the function of the gap adjustment structure 4 easier to realize. Specifically, the gap adjustment structure 4 faces the inner port 1 21a and the inner port 22a with the same end face, and the end face gradually converges from bottom to top. The positions of the inner port 1 21a and the inner port 22a on the cover 24 correspond to the formation of a recess that gradually converges from bottom to top; a uniform overall gap is obtained between the end face and the recess, which includes the first flow gap and the second flow gap.

[0027] In this configuration, the structure that gradually converges from bottom to top allows for a relatively smooth airflow guidance, while also guiding some of the upward-moving powder to slide back into the tank 3 under an inclined trend. The end face of the gap adjustment structure 4 facing away from the inner port 1 21a and inner port 2 22a can be set as a plane to shield the powder material.

[0028] With this gap adjustment structure 4, when nitrogen filling is performed through the first channel 21 and / or the second channel 22, the airflow can also be dispersed into the tank 3 under the overall gap in a divergent state, thus avoiding concentrated impact on the powder material.

[0029] Example 2: like Figures 1-6 As shown, the vacuuming and nitrogen-filling module includes the auxiliary cover mechanism as described in Embodiment 1, and further includes: Vacuum chamber 5 is provided with an open end for the tank 3 to enter and exit, that is, during the vacuuming and nitrogen filling process, the tank 3 is placed inside the vacuum chamber 5; gate 6 and gate power 7, the gate 6 is sealed or opened under the action of gate power 7; the power unit 1 of the auxiliary cover mechanism is installed outside the vacuum chamber 5, the inner port 21a of the first channel 21 is located inside the vacuum chamber 5, the outer port 21b is located outside the vacuum chamber 5, and the inner port 22a and the outer port 22b of the second channel 22 are both located inside the vacuum chamber 5.

[0030] In this preferred embodiment, the size of the vacuum box 5 is set according to production needs and can be appropriately enlarged to achieve greater tolerance for changes in product specifications. The operation mode of the gate 6 can be set in conjunction with the transmission mode of the transfer module 11. As a specific implementation, a gate 6 structure that moves up and down can be adopted. The gate power 7 can be a cylinder or electric cylinder, etc., to realize the upward opening and downward closing of the gate 6 structure.

[0031] As the preferred of the embodiment, the vacuumizing and nitrogen-filling module further comprises an air inflation sealing ring 51, which is installed at the joint of the open end and the gate 6, seals the joint, and obtains a sealed cavity inside the vacuum tank 5. In the implementation process, the zero-leakage sealing of the vacuum cavity is realized by the elastic expansion of the air inflation sealing ring 51, which supports the small-batch specification switching without replacing the sealing element.

[0032] As the preferred of the above embodiment, the vacuumizing and nitrogen-filling module further comprises: a negative pressure tank connected to the inside of the vacuum tank 5 through a first pipeline and connected to the outer port one 21b through a second pipeline; and a vacuum pump connected to the inside of the negative pressure tank through a third pipeline.

[0033] In the preferred, the vacuumizing operation can be quickly realized through the relatively large negative pressure space provided by the negative pressure tank, and the buffering effect is realized in the subsequent vacuumizing process to realize a smooth and stable vacuumizing process. In the implementation process, a valve body structure is provided for each pipeline to control the flow of gas and the specific flow area.

[0034] As the preferred of the above embodiment, in the vacuumizing process inside the tank body 3, it comprises: directly vacuumizing the inside of the tank body 3 through the first channel 21; and indirectly vacuumizing the inside of the tank body 3 through the second channel 22 by vacuumizing the inside of the vacuum tank 5; keeping the vacuum degree inside the vacuum tank 5 less than or equal to the vacuum degree inside the tank body 3.

[0035] In the preferred, three cases are included: The first case: the vacuum degree inside the vacuum tank 5 is always kept less than or equal to the vacuum degree inside the tank body 3, that is, the pressure inside the vacuum tank 5 is greater than or equal to the pressure inside the tank body 3. In the vacuumizing process, the vacuumizing process inside the vacuum tank 5 and the tank body 3 can effectively realize the extraction of air inside the tank body 3; and the pressure difference between the two can effectively inhibit the flying and escaping of the powder material inside the tank body 3 into the vacuum tank 5; of course, the pressure difference is controlled within a certain range, so as to ensure that the vacuumizing action of the tank body 3 is relatively stable through the first channel 21 and the second channel 22 under the limited pressure difference, thereby ensuring the vacuumizing effect.

[0036] This method achieves an initial pressure difference by first evacuating the inside of tank 3 and then evacuating the inside of vacuum chamber 5. Maintaining this pressure difference, or allowing it to change appropriately, is within the scope of this invention. As a specific implementation, when using the negative pressure tank described in the above embodiments, the inside of tank 3 and the inside of the negative pressure tank are first connected through the first channel 21, thus obtaining an initial negative pressure value inside tank 3. Then, the inside of vacuum chamber 5 and the inside of the negative pressure tank are connected, so that the inside of tank 3 is connected to the inside of vacuum chamber 5 through the second channel 22. The internal vacuum level tends to equalize with the vacuum level inside vacuum chamber 5. Throughout this process, the opening of the control valves on the pipeline paths between the negative pressure tank, vacuum chamber 5, and the inside of tank 3 needs precise adjustment.

[0037] The second method involves maintaining the vacuum level inside the vacuum chamber 5 equal to that inside the tank 3. During this process, no pressure difference is formed between the tank 3 and the vacuum chamber 5, preventing the powder material inside the tank 3 from escaping into the vacuum chamber 5. This requires continuous monitoring of the vacuum levels inside the tank 3 and the vacuum chamber 5, and precise control as described above. As a specific implementation method, when using the negative pressure tank described in the above embodiments, the interior of the tank 3 and the negative pressure tank, as well as the interior of the vacuum chamber 5 and the negative pressure pipe, can be simultaneously connected. The opening of the control valve on the pipeline path between the negative pressure tank and these two can be adjusted to achieve this.

[0038] The third method involves first maintaining the vacuum level inside the vacuum chamber 5 as lower than that inside the tank 3, and then gradually transitioning to a state where the vacuum level inside the vacuum chamber 5 equals that inside the tank 3 through curve control. The technical effects achieved by this method are the same as those of the two methods mentioned above, and will not be elaborated here.

[0039] All three methods mentioned above are within the protection scope of this invention and can be selected according to actual needs. By using the above methods, on the one hand, the vacuuming efficiency can be guaranteed, and on the other hand, the cleanliness of the vacuum chamber 5 and the stability of the powder state in the container 3 can be guaranteed.

[0040] Example 3: like Figures 1-8 As shown, the integrated machine performs powder material filling, vacuuming, and nitrogen purging operations, including: The filling module 9 fills the tank 3 with powder material. In this embodiment, the filling module 9 preferably achieves coarse filling of powder material through a negative pressure filling system and fine filling of powder material through a screw filling system. The vacuuming and nitrogen filling module as described in Embodiment 2 performs vacuuming and nitrogen filling operations simultaneously and sequentially on several tanks 3 after filling. The low oxygen MAP maintaining module 10 provides a low oxygen space with an oxygen content below a set value for the tanks 3 from the vacuuming and nitrogen filling module.

[0041] The all-in-one machine also comprises a sealing module installed in the low-oxygen space to realize cap installation for each tank body 3; in the embodiment, the installation of the cap is taken as an example of screwing the cap, and the sealing module in the embodiment at least comprises a screwing system to realize cap storage and screwing through the screwing system, the cap body is transported to the screwing station through the conveying structure in the low-oxygen space, and the tank body 3 after vacuumizing and nitrogen filling is also sent to the screwing station to perform servo screwing at the screwing station; this part is at least an operation that needs to be completed in the low-oxygen space, and the tank body 3 can be removed from the low-oxygen space after the cap installation is completed to ensure a certain degree of sealing of the tank body 3. Of course, in order to better ensure the low residual oxygen content of the tank body 3, a magnetic induction sealing device can also be further arranged in the low-oxygen space to perform magnetic induction sealing on the cap body; the magnetic induction sealing device can also be arranged outside the low-oxygen space under the condition that the screwing is completed and the sealing is ensured; as an optimized mode, a tank opening powder scraping device can also be arranged in the low-oxygen space to clean the tank opening of the tank body 3 before the cap installation, thereby effectively preventing the powder accumulation at the tank opening from causing a magnetic induction sealing failure.

[0042] The all-in-one machine is provided with a transfer module 11 to realize the transfer of the tank body 3 between the filling module 9, the vacuumizing and nitrogen filling module and the low-oxygen MAP maintaining module 10, and the specific structural form can be selected and used in the prior art.

[0043] In the embodiment, the negative pressure rough filling and screw rod fine filling in the filling module 9 and the auxiliary cap mechanism can effectively ensure the accuracy of the powder material amount in the tank body 3 during the whole process of filling, vacuumizing and nitrogen filling; and the use of the vacuumizing and nitrogen filling module and the low-oxygen MAP maintaining module 10 can effectively meet the residual oxygen content index in the final product for various personalized product packaging.

[0044] As a preferred mode of the above embodiment, as shown in Figure 9 the working method of the all-in-one machine comprises: A1: filling the tank body 3 with powder material to obtain a required filling amount; A2: synchronously sending a plurality of filled tank bodies 3 into the vacuum box 5 and plugging the tank opening of the tank body 3; A3: synchronously performing vacuumizing and nitrogen filling operations on the filled tank bodies 3; A4: unplug the tank opening and send the tank body 3 into the low-oxygen space; A5: installing a cap on the tank body 3 in the low-oxygen space.

[0045] The several can bodies 3 filled are simultaneously realized vacuumizing and nitrogen filling, and realize cover installation in the low-oxygen MAP maintaining module 10 according to the set production rhythm, and can realize low-speed production for diversified small-batch production design; through the modular filling, vacuumizing and nitrogen filling integrated machine in the application, the rapid specification switching can be adapted; specifically, in the software aspect, the filling amount, vacuumizing operation, nitrogen filling operation and related parameters of low-oxygen environment can be quickly adjusted; the vacuum box 5 and the low-oxygen space have the inclusiveness to the specification change itself; in the implementation process, through the pre-set various control parameter combinations, and the reasonable design and use of the quickly dismountable partial replacement structure, the specification switching time consumption can be effectively reduced.

[0046] Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A secondary cover mechanism, characterized by, In the process of vacuumizing and nitrogen-filling of the tank, the tank opening is blocked, comprising: a power device; at least one auxiliary cover, which is closed and opened relative to the tank opening by power from the power device; the auxiliary cover comprises a first channel and a second channel, the first channel is connected with the inside and outside of the tank through inner port one and outer port one respectively, and the second channel is connected with the inside and outside of the tank through inner port two and outer port two respectively.

2. The assistive cover mechanism of claim 1, wherein, It also comprises a gap adjustment structure, which covers the inner port one and controls the first flow gap between the first channel and the inside of the tank, and covers the inner port two and controls the second flow gap between the second channel and the inside of the tank. The auxiliary cover comprises a rod body and a cover body, the cover body is connected with the power device through the rod body, the first channel is connected with the inside and outside of the tank through the inside of the rod body, and the second channel is connected with the inside and outside of the tank on the cover body.

3. The assistive cover mechanism of claim 2, wherein, The rod body is vertically connected with the middle part of the cover body, the second channel is distributed with at least three, and is uniformly distributed around the rod body.

4. The assistive cover mechanism of claim 3, wherein, The gap adjustment structure is towards the inner port one and the inner port two through the same end face, the end face is gradually converging from bottom to top, and the positions of the inner port one and the inner port two on the cover body correspond to form the recess gradually converging from bottom to top; 5. The assistive cover mechanism of claim 4, wherein, The end face and the recess obtain uniform overall gap, and the first flow gap and the second flow gap are contained therein. It comprises the auxiliary cover mechanism as claimed in any one of claims 1-5, and further comprises:

6. A vacuum and nitrogen filling module characterized in that, a vacuum box, which is provided with an open end for the tank to enter and exit; a gate and a gate power, the gate blocks or opens the open end under the action of the gate power; the power device of the auxiliary cover mechanism is installed outside the vacuum box, the inner port one of the first channel is located inside the vacuum box, the outer port one is located outside the vacuum box, and the inner port two and the outer port two of the second channel are both located inside the vacuum box. It further comprises:

7. The vacuum and nitrogen filling module according to claim 6, characterized in that, a negative pressure tank, which is connected with the inside of the vacuum box through a first pipeline, and is connected with the outer port one through a second pipeline; a vacuum pump, which is connected with the inside of the negative pressure tank through a third pipeline. In the process of vacuumizing the inside of the tank, comprising:

8. The method of claim 6, wherein the vacuum and nitrogen filling module is operated by, directly vacuumizing the inside of the tank through the first channel; and indirectly vacuumizing the inside of the tank through the second channel by vacuumizing the inside of the vacuum box; the vacuum degree of the inside of the vacuum box is less than or equal to the vacuum degree of the inside of the tank. It comprises:

9. A unitary machine characterized by a filling module, which fills the powder material into the tank; the vacuumizing and nitrogen-filling module as claimed in claim 6, which synchronously and sequentially performs vacuumizing and nitrogen-filling operation on the filled tanks; a low-oxygen MAP maintaining module, which provides a low-oxygen space with oxygen content below a set value for the tanks from the vacuumizing and nitrogen-filling module; a sealing module, which is installed in the low-oxygen space and realizes the installation of the cover for each tank; a transfer module, which realizes the transfer of the tank among the filling module, the vacuumizing and nitrogen-filling module and the low-oxygen MAP maintaining module. It comprises:

10. The method of claim 9, wherein the one machine is a vending machine. ​ filling the powder material into the can body to obtain a required filling amount; synchronously sending a plurality of filled can bodies into the vacuum box, and plugging the can opening of the can body; synchronously performing vacuumizing and nitrogen filling operations on the filled can bodies; unplugging the can opening, and sending the can body into the low-oxygen space; installing a cover on the can body in the low-oxygen space.

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