Closed cavity vacuum type powder material automatic vacuum packaging equipment

Abstract

The present application relates to closed cavity vacuum type powder material vacuum packaging technical field, specifically to a kind of closed cavity vacuum type powder material automatic vacuum packaging equipment;Including vacuum storehouse, air extraction component, closure component and sorting component, vacuum storehouse is formed with the vacuum cavity for accommodating packaging bag;The present application is cooperated with air extraction component and closure component, so that packaging bag is first in the middle of bag opening Keep open state under high-speed air extraction, and utilize separation storehouse to separate and temporarily store powder that disperses with high-speed airflow;And low disturbance air extraction is carried out through air extraction pipe, simultaneously using the pressure difference established in advance between separation storehouse and packaging bag makes temporarily stored powder return to packaging bag through first docking groove stably, to establish high-speed vacuum, collect and subsequent low disturbance air extraction and powder recovery and powder are completed in stages, to effectively improve vacuum establishment efficiency, and reduce product powder loss, simultaneously especially suitable for the powder packaging working condition that originally needs long time low disturbance air extraction.

Description

Technical Field

[0001] This invention relates to the field of closed-cavity vacuum packaging technology for powder materials, specifically to an automatic vacuum packaging device for closed-cavity vacuum powder materials. Background Technology

[0002] Closed-cavity vacuum packaging involves placing the material to be packaged and its packaging bag in a relatively enclosed vacuum space. By extracting air from this enclosed space and the inside of the packaging bag, the packaging bag gradually reaches a predetermined vacuum state before the bag opening is sealed. Compared to directly extracting air from the packaging bag in an open environment, closed-cavity vacuum packaging allows the extraction process to take place in a relatively stable enclosed environment. This facilitates the establishment of a vacuum state in a concentrated manner and reduces the impact of continuous external air entering the vacuum process. Therefore, it is widely used in the packaging of materials that require reducing residual air inside the packaging bag.

[0003] In existing technologies, when vacuum packaging powder materials in a closed cavity, air is typically extracted from the packaging bag and vacuum chamber using a vacuum pump and corresponding extraction pipelines, gradually bringing the packaging bag to a predetermined vacuum state. Since the air inside the packaging bag can easily carry some powder particles as it is expelled towards the bag opening and extraction area, in order to reduce the disturbance of the airflow to the powder inside the packaging bag and the migration of the powder outward with the expelled airflow, existing powder vacuum packaging processes usually control the extraction speed or adjust the corresponding extraction parameters according to the characteristics of the powder material and packaging requirements. This allows the air inside the packaging bag to be gradually expelled under a relatively gentle airflow, thereby reducing powder scattering and product material loss during the vacuuming process.

[0004] However, the aforementioned closed-cavity vacuum packaging method for powders still has the following drawbacks: When performing closed-cavity vacuum packaging of powder materials, to reduce the disturbance of the powder inside the packaging bag caused by airflow during the evacuation process, methods such as reducing the evacuation speed, controlling the bag opening state, or adjusting the powder state are typically used to reduce powder migration with the airflow. However, reducing the evacuation speed prolongs the air removal time from the packaging bag and vacuum cavity, causing a decrease in the vacuum establishment speed and thus affecting the operational efficiency of the continuous packaging process. Conversely, when the evacuation speed is increased to shorten the vacuum establishment time, the speed at which air is expelled from the bag opening increases accordingly, which can affect the area near the bag opening. The powder has a stronger carrying effect, causing some powder particles to leave the packaging bag with the exhaust airflow and migrate towards the vacuum chamber and the air extraction path. This makes it difficult for the powder inside the packaging bag to remain stable during the high-speed air extraction phase. Therefore, in the process of vacuum packaging of powder in a closed cavity, although reducing airflow disturbance is beneficial to reduce powder escape, it will limit the vacuum establishment speed. On the other hand, although increasing the air extraction speed can shorten the main air extraction time, it will exacerbate the migration and escape of powder with the airflow. This creates a mutual constraint between air extraction efficiency and the stable maintenance of powder inside the packaging bag, making it difficult to improve vacuum packaging efficiency while reducing product powder loss and maintaining the stability of the packaging process. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic vacuum packaging device for closed-cavity vacuum powder materials, so as to solve the problem of mutual restriction between air extraction efficiency and powder stability in the existing technology of closed-cavity vacuum packaging of powder materials.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solution: a closed-cavity vacuum automatic vacuum packaging equipment for powder materials, used for closed-cavity vacuum packaging of packaging bags, including a vacuum chamber, an air extraction component, a sealing component and a sorting component; the vacuum chamber has a vacuum cavity for accommodating the packaging bags.

[0007] The air extraction component has a first air extraction passage and a second air extraction passage. The first air extraction passage is provided with a separation chamber for separating and temporarily storing powder that migrates with the air extraction flow. The second air extraction passage is used to communicate with the inside of the packaging bag.

[0008] The sealing assembly is used to clamp and seal the opening of the packaging bag located in the vacuum chamber.

[0009] The sorting component includes a second connecting pipe and a settling chamber. The second connecting pipe connects the separation chamber and the settling chamber. The settling chamber forms a temporary space for powder settling. The separation chamber and the settling chamber respectively form powder conveying paths for communication with the inside of the packaging bag.

[0010] Preferably, the air extraction assembly further includes a flow guide hood, a first connecting pipe, and an airflow pipe; the flow guide hood is disposed above the opening of the packaging bag, and a flow guide cavity with an open lower end is formed inside the flow guide hood; the first connecting pipe connects the flow guide cavity and the separation chamber; the airflow pipe connects to the separation chamber and is used to connect to an external pump, so that the air in the vacuum chamber and the packaging bag, as well as the powder that escapes with the airflow, enter the separation chamber sequentially through the flow guide cavity and the first connecting pipe.

[0011] Preferably, the air extraction assembly further includes an air extraction pipe forming a second air extraction passage. The lower end of the air extraction pipe is used to extend into the opening of the packaging bag and is equipped with an electrically controlled valve. The upper end of the air extraction pipe is used to connect to an external pump.

[0012] Preferably, the first connecting pipe is eccentrically connected to the upper part of the separation chamber, so that the air entering the separation chamber through the first connecting pipe and the powder it carries form a swirling motion inside the separation chamber.

[0013] Preferably, the opening connecting the second connecting pipe to the separation chamber is located in the area corresponding to the inertial movement path of the agglomerated powder particles after they enter the separation chamber.

[0014] Preferably, the settling chamber has a powder settling space that is larger than the internal flow space of the second connecting pipe.

[0015] Preferably, the first and second connecting pipes are respectively equipped with electrically controlled valves for controlling their connection state; the airflow pipe is also used to deliver pressurized gas into the separation chamber, and the upper end of the settling chamber is equipped with a pressurizing pipe for delivering pressurized gas into the settling chamber; the lower ends of the separation chamber and the settling chamber are respectively equipped with electrically controlled valves for controlling the on / off of the corresponding powder conveying path.

[0016] Preferably, the air extraction assembly further includes a docking component, the right end of which is connected to the lower end of the separation chamber, and the left end of which is connected to the lower end of the settling chamber. The docking component is provided with a first docking groove and a second docking groove that are connected vertically. The first docking groove is used to connect the separation chamber with the inside of the packaging bag, and the second docking groove is used to connect the settling chamber with the inside of the packaging bag.

[0017] Preferably, the vacuum assembly further includes a docking member; the sealing assembly includes a first sealing clamp, a second sealing clamp, and a third sealing clamp; the first sealing clamp is used to clamp one end of the bag opening to the outside of the docking member, the second sealing clamp is used to clamp the other end of the bag opening to the outside of the vacuum tube, and the third sealing clamp is disposed between the first sealing clamp and the second sealing clamp and is used to clamp the area where the bag opening is located between the first sealing clamp and the second sealing clamp.

[0018] Preferably, the vacuum chamber includes a chamber body and a chamber door; two first sealing clamps, two second sealing clamps, and three third sealing clamps are provided and are respectively arranged in a front-to-back manner. The first sealing clamp on the front side is driven to move back and forth by a first electric push rod fixed to the chamber body, and the first sealing clamp on the rear side is fixed to the chamber door. The second sealing clamp on the front side is driven to move back and forth by a second electric push rod fixed to the chamber body, and the second sealing clamp on the rear side is fixed to the chamber door. Both third sealing clamps are movable in the front-to-back direction. The third sealing clamp on the front side is driven to move back and forth by a third electric push rod fixed to the chamber body, and the third sealing clamp on the rear side is driven to move back and forth by a fourth electric push rod fixed to the chamber door.

[0019] Compared with the prior art, the beneficial effects of this application are as follows: 1. This invention utilizes a combination of a vacuum extraction component and a sealing component to allow high-speed vacuuming of the packaging bag while the bag opening remains open in the middle. A separation chamber is used to temporarily separate and store the powder that escapes with the high-speed airflow. After the main air is exhausted, the bag opening is sealed, and low-disturbance vacuuming is performed through the extraction pipe. Simultaneously, the pre-established pressure difference between the separation chamber and the packaging bag allows the temporarily stored powder to be stably returned to the packaging bag via the first docking groove. This allows for the phased completion of high-speed vacuum establishment, powder collection, and subsequent low-disturbance vacuuming and powder recovery, effectively improving vacuum establishment efficiency and reducing product powder loss. It is particularly suitable for powder packaging processes that previously required a longer time for low-disturbance vacuuming.

[0020] 2. This invention places the second connecting pipe on the inertial movement path of easily agglomerated powder particles after they enter the separation chamber. This allows these particles to preferentially enter the settling chamber before continuing to move towards the inner wall of the separation chamber and experiencing high-intensity collisions. The larger internal space of the settling chamber reduces their movement speed, allowing them to settle and be temporarily stored with low collision intensity or minimal collisions with the side walls of the settling chamber. Subsequently, the temporarily stored powder is returned to the packaging bag through the second docking groove. This avoids the retention of highly inertial, easily agglomerated powder particles due to wall adhesion during the cyclone separation process, effectively improving the actual recovery rate and material utilization of this type of product powder. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a frontal cross-sectional view of the structure of the present invention.

[0023] Figure 3 This is a top-view cross-sectional view of the structure of the present invention.

[0024] Figure 4 This is a schematic diagram of the internal structure of the warehouse.

[0025] Figure 5 This is a schematic diagram of the air extraction component.

[0026] Figure 6 This is a front view cross-sectional diagram of the air extraction component structure.

[0027] Figure 7 This is a partial cross-sectional schematic diagram of the separation chamber structure.

[0028] Figure 8 This is a rear cross-sectional view of the separation chamber structure.

[0029] Explanation of reference numerals in the attached drawings: 1. Packaging bag; 2. Vacuum chamber; 21. Chamber body; 211. Vacuum cavity; 22. Chamber door; 3. Vacuum extraction assembly; 31. Vacuum extraction pipe; 32. Flow guide hood; 321. Flow guide cavity; 33. First connecting pipe; 34. Separation chamber; 35. Airflow pipe; 36. Connecting piece; 361. First connecting groove; 362. Second connecting groove; 4. Sealing assembly; 41. First sealing clamp; 42. Second sealing clamp; 43. Third sealing clamp; 5. Sorting assembly; 51. Second connecting pipe; 52. Settling chamber; 53. Pressurization pipe. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0031] Example 1 In existing closed-cavity vacuum packaging of powder materials, to reduce the disturbance of the powder inside the packaging bag 1 by airflow during the evacuation process, methods such as reducing the evacuation speed, controlling the bag opening state, or adjusting the powder state are usually used to reduce powder migration with the airflow. However, reducing the evacuation speed will prolong the air removal time inside the packaging bag 1 and vacuum chamber 211, thus reducing the vacuum establishment speed and affecting the efficiency of continuous packaging processes. On the other hand, when the evacuation speed is increased to shorten the vacuum establishment time, the speed at which air is discharged from the bag opening inside the packaging bag 1 increases, and it will have a stronger carrying effect on the powder near the bag opening area. This causes some powder particles to leave the packaging bag 1 with the exhaust airflow and migrate towards the vacuum chamber 211 and the air extraction path, making it difficult for the powder inside the packaging bag 1 to remain stable during the high-speed air extraction phase. Therefore, in the closed-cavity vacuum packaging process, although reducing airflow disturbance is beneficial to reducing powder escape, it will limit the vacuum establishment speed. On the other hand, although increasing the air extraction speed can shorten the main air extraction time, it will exacerbate the migration and escape of powder with the airflow. This creates a mutual constraint between air extraction efficiency and the stable maintenance of powder inside the packaging bag 1, making it difficult to reduce product powder loss and maintain the stability of the packaging process while improving vacuum packaging efficiency.

[0032] like Figures 1 to 8An automatic vacuum packaging device for powder materials with closed-cavity vacuuming is disclosed, which is used to perform closed-cavity vacuum packaging of packaging bag 1. It includes a vacuum chamber 2, an air extraction component 3, and a sealing component 4. The vacuum chamber 2 is provided with the air extraction component 3 and the sealing component 4. The air extraction component 3 is used to extract air from the packaging bag 1 in stages, including a high-speed air extraction stage and a low-disturbance air extraction stage. The sealing component 4 is used to install and connect the packaging bag 1 to the air extraction component 3 and to clamp and seal the opening of the packaging bag 1. The upper end of the packaging bag 1 forms an upward-facing opening.

[0033] The vacuum chamber 2 includes a chamber body 21 and a chamber door 22; a vacuum cavity 211 is provided inside the chamber body 21, and an opening is formed at the rear side of the vacuum cavity 211. The chamber body 21 and the chamber door 22 are provided at the rear side, and the left end of the chamber body 21 and the chamber door 22 are hinged together. The chamber door 22 is used to close the opening at the rear side of the vacuum cavity 211 so that the vacuum cavity 211 forms a closed space for vacuuming the packaging bag 1.

[0034] like Figure 1 , Figure 2 and Figure 8 The vacuum assembly 3 includes a vacuum pipe 31, a flow guide 32, a first connecting pipe 33, a separation chamber 34, and a docking piece 36; the upper end of the vacuum chamber 211 is provided with a flow guide 32, the right side of the flow guide 32 is provided with a vacuum pipe 31, the left side of the flow guide 32 is provided with a first connecting pipe 33, the left side of the first connecting pipe 33 is provided with a separation chamber 34, and the lower side of the separation chamber 34 is provided with a docking piece 36.

[0035] like Figure 2 , Figures 4 to 6 The flow guide hood 32 is located above the opening of the packaging bag 1. The upper side of the flow guide hood 32 is fixedly connected to the upper inner wall of the vacuum chamber 211. A flow guide cavity 321 is opened inside the flow guide hood 32, and the lower end of the flow guide cavity 321 forms an opening. The lower opening of the flow guide cavity 321 is used to allow air inside the vacuum chamber 211 and air inside the packaging bag 1 to enter the flow guide cavity 321. At the same time, it is used to allow powder that escapes from inside the packaging bag 1 during high-speed air extraction to enter the flow guide cavity 321.

[0036] like Figure 2 , Figures 4 to 6 An electrically controlled valve (not shown in the figure) is provided at the lower end of the suction pipe 31. The lower end of the suction pipe 31 extends into the right end of the opening of the packaging bag 1. The suction pipe 31 extends vertically and passes through the upper end of the chamber 21. The suction pipe 31 is fixedly connected to the upper end of the chamber 21. The upper end of the suction pipe 31 is connected to an external pump (not shown in the figure). The suction pipe 31 is used to continue to extract the remaining air inside the packaging bag 1 in a low-disturbance state after the high-speed suction stage is completed.

[0037] like Figure 2 , Figures 5 to 8The upper end of the separation chamber 34 and the upper end of the flow guide shroud 32 are fixedly connected by a first connecting pipe 33, and an electric control valve is also provided in the first connecting pipe 33. The first connecting pipe 33 is used to connect the flow guide cavity 321 inside the flow guide shroud 32 with the interior of the separation chamber 34, so that the air in the flow guide cavity 321 and the powder migrating with the airflow enter the upper end of the interior of the separation chamber 34 in an eccentric direction.

[0038] like Figure 2 , Figures 5 to 8 An airflow pipe 35 is fixedly installed at the upper end of the separation chamber 34. The airflow pipe 35 extends vertically, with its lower end extending into the interior of the separation chamber 34 and extending upward through the upper end of the chamber body 21 and fixedly connected to the chamber body 21. The upper end of the airflow pipe 35 is also connected to an external pump. The airflow pipe 35 is used to quickly extract air from the vacuum chamber 211 and the packaging bag 1. The airflow pipe 35 can also be used to deliver pressurized gas into the separation chamber 34. The separation chamber 34 is used to form a temporary storage space for separating air from the powder that enters with the airflow, allowing air to be discharged through the airflow pipe 35 while temporarily storing the powder in the separation chamber 34. An electrically controlled valve is installed at the lower end of the separation chamber 34.

[0039] like Figure 2 , Figure 3 , Figure 5 and Figure 6 The right end of the docking member 36 is fixedly connected to the lower end face of the separation chamber 34. The docking member 36 extends into the left end of the opening of the packaging bag 1. The right end of the docking member 36 is provided with a first docking groove 361 that runs vertically through the packaging bag 1. The first docking groove 361 is used to connect the inside of the separation chamber 34 with the inside of the packaging bag 1 and form a powder conveying path between the separation chamber 34 and the packaging bag 1.

[0040] like Figure 2 and Figure 3The sealing assembly 4 includes a first sealing clamp 41, a second sealing clamp 42, and a third sealing clamp 43. The first sealing clamp 41 is symmetrically arranged at the left end of the vacuum chamber 211, the second sealing clamp 42 is symmetrically arranged at the right end of the vacuum chamber 211, and the third sealing clamp 43 is symmetrically arranged between the first and second sealing clamps 41 and 42 within the vacuum chamber 211. The two first sealing clamps 41 are used to clamp and fix the left end of the bag opening of the packaging bag 1 to the outer surface of the connecting piece 36. The front first sealing clamp 41 is connected to the chamber body 21 via a first electric actuator, which is fixedly mounted on the chamber body 21. The output end of the first electric actuator is fixedly connected to the front first sealing clamp 41 to drive the front first sealing clamp 41 to move back and forth. The rear first sealing clamp 41 is fixedly connected to the front of the chamber door 22. The two second sealing clamps 42 are used to clamp and fix the right end of the bag opening of the packaging bag 1 to the outer surface of the lower end of the suction pipe 31. The second sealing clamp 42 on the front side is connected to the compartment body 21 via a second electric push rod. The second electric push rod is fixedly mounted on the compartment body 21, and its output end is fixedly connected to the second sealing clamp 42 on the front side, for driving the second sealing clamp 42 on the front side to move back and forth. The second sealing clamp 42 on the rear side is fixedly connected to the front side of the compartment door 22. The two third sealing clamps 43 are used to clamp and seal the area between the first sealing clamp 41 and the second sealing clamp 42 at the opening of the packaging bag 1. The third sealing clamp 43 on the front side is connected to the compartment body 21 via a third electric push rod. The third electric push rod is fixedly mounted on the compartment body 21, and its output end is fixedly connected to the third sealing clamp 43 on the front side. The third sealing clamp 43 on the rear side is connected to the compartment door 22 via a fourth electric push rod. The fourth electric push rod is fixedly mounted on the compartment door 22, and its output end is fixedly connected to the third sealing clamp 43 on the rear side, so as to drive the two third sealing clamps 43 to move back and forth respectively.

[0041] Working principle of vacuum assembly 3: During powder vacuum packaging, the packaging bag 1 containing the powder material is first placed into the vacuum chamber 211, with the connecting piece 36 extending into the left end of the bag opening and the lower end of the vacuum tube 31 extending into the right end of the bag opening. Then, the first electric push rod causes the front first sealing clamp 41 to clamp the front side of the left end of the bag opening onto the outer surface of the connecting piece 36, and the second electric push rod causes the front second sealing clamp 42 to clamp the front side of the right end of the bag opening onto the outer surface of the lower end of the vacuum tube 31, thus temporarily fixing the packaging bag 1. The third sealing clamp 43 is not clamped at the bag opening. Then, the chamber door 22 is closed, so that the rear first sealing clamp 41 and second sealing clamp 42 cooperate with the front first sealing clamp 41 and second sealing clamp 42 respectively to seal and clamp the corresponding ends of the bag opening onto the outer surface of the connecting piece 36 and the outer surface of the lower end of the vacuum tube 31. At the same time, the first sealing clamp 41 and second sealing clamp 42... The bag opening area between the second sealing clamps 42 remains open; at this time, the electric control valves at the lower end of the suction pipe 31 and the lower end of the separation chamber 34 are closed, the electric control valve in the first connecting pipe 33 is opened, and the airflow pipe 35 is used to pump air at high speed through an external pump. The air in the packaging bag 1 then enters the vacuum chamber 211 through the open bag opening in the middle, and together with the air in the vacuum chamber 211, enters the separation chamber 34 through the guide chamber 321 and the first connecting pipe 33, thereby quickly discharging most of the air in the packaging bag 1 and the vacuum chamber 211 and reducing the internal pressure of both; while some of the powder carried out by the high-speed suction airflow enters the guide chamber 321 synchronously with the air, and enters the upper part of the separation chamber 34 eccentrically through the first connecting pipe 33, thereby causing the air entering the separation chamber 34 and the powder it carries to form a swirling motion, and the powder is separated from the discharged air. The separated air is discharged through the airflow pipe 35, and the powder is temporarily stored in the separation chamber 34. After most of the air in the packaging bag 1 has been expelled, the two third sealing clamps 43 move towards each other and clamp the bag opening area between the first sealing clamp 41 and the second sealing clamp 42, so that the bag opening of the packaging bag 1 is kept closed by the first sealing clamp 41, the second sealing clamp 42 and the third sealing clamp 43. After the third sealing clamp 43 has completed clamping, the airflow pipe 35 can continue to perform short-term high-speed air extraction, so that the loose powder still stuck in the guide cavity 321 and the first connecting pipe 33 can continue to enter the separation chamber 34 with the airflow. Then the high-speed air extraction can be stopped and the electric control valve in the first connecting pipe 33 can be closed, so that the separation chamber 34 is isolated from the guide cavity 321. After completing the high-speed vacuuming and powder storage, pressurized gas is supplied to the separation chamber 34 through the airflow pipe 35, raising the pressure inside the separation chamber 34 to a level higher than the internal pressure of the packaging bag 1. Once the required pressure for material return is reached, the supply of pressurized gas to the separation chamber 34 is stopped. Subsequently, the electric control valve at the lower end of the separation chamber 34 and the electric control valve at the lower end of the vacuum pipe 31 are opened. Under the pressure difference between the separation chamber 34 and the packaging bag 1, the powder temporarily stored in the separation chamber 34 is transported downward through the first docking groove 361 and returned to the inside of the packaging bag 1. At the same time, the remaining air inside the packaging bag 1 is continuously extracted through the vacuum pipe 31 at a lower vacuuming speed, thereby completing the subsequent vacuuming process of the packaging bag 1 with less disturbance. After the powder temporarily stored in the separation chamber 34 has been returned and the packaging bag 1 has reached the predetermined vacuum state, the vacuuming is stopped and the corresponding electric control valve is closed, thereby completing the staged vacuuming and escaping powder recovery process of the packaging bag 1. The opening of the packaging bag 1 can be heat-sealed by an existing heat-sealing device (not shown in the figure).

[0042] It should be emphasized that the core improvement of this embodiment lies in the following: by cooperating with the vacuuming component 3 and the sealing component 4, the packaging bag 1 is first subjected to high-speed vacuuming while the bag opening is open in the middle, and the powder that escapes with the high-speed airflow is separated and temporarily stored using the separation chamber 34; after the main air is discharged, the bag opening is sealed, and low-disturbance vacuuming is performed through the vacuuming pipe 31. At the same time, the pressure difference pre-established between the separation chamber 34 and the packaging bag 1 is used to stably return the temporarily stored powder to the packaging bag 1 through the first docking groove 361. Thus, the high-speed vacuum establishment, the collection of escaped powder, and the subsequent low-disturbance vacuuming and powder recovery are completed in stages, thereby effectively improving the vacuum establishment efficiency and reducing product powder loss. It is especially suitable for powder packaging conditions that originally required a long time for low-disturbance vacuuming.

[0043] It should be noted that the specific pumping speeds corresponding to the high-speed pumping stage and the low-disturbance pumping stage, as well as the timing of switching between the two, can be determined through experiments based on the particle size, density, flowability, and degree of airflow disturbance of the packaged powder, the volume and filling amount of the packaging bag 1, and the predetermined vacuum requirements. For example, the migration and dispersion of powder inside the packaging bag 1 can be observed at different pumping speeds, and combined with the rate of pressure decrease in the packaging bag 1 and the vacuum chamber 211, the high-speed pumping parameters that can quickly expel most of the air, and the low-disturbance pumping parameters that can continue to reduce the internal pressure of the packaging bag 1 after the bag opening is closed without causing significant powder disturbance can be determined. The clamping timing of the third sealing clamp 43 can also be determined based on the pressure change inside the packaging bag 1 or the predetermined pumping time during the high-speed pumping process.

[0044] It should be noted that the pre-pressurization required when the separation chamber 34 returns material to the packaging bag 1 can be determined through testing based on the amount of powder temporarily stored in the separation chamber 34, the powder flowability, and the internal pressure of the packaging bag 1. This ensures that even after the pressurized gas supply to the separation chamber 34 is stopped and its lower electrically controlled valve is opened, there is still a pressure difference between the separation chamber 34 and the packaging bag 1 sufficient to allow the temporarily stored powder to be transported to the packaging bag 1 through the first docking groove 361. The corresponding pre-pressurization does not need to be limited to a fixed value and can be adaptively adjusted according to different powder materials and packaging conditions.

[0045] Example 2 Understandably, in Example 1, the powder that escapes during high-speed suction can enter the separation chamber 34 with the airflow, where it is separated and temporarily stored before being returned to the packaging bag 1 through a subsequent return process. However, for powders with a strong tendency to adhere or agglomerate, such as milk powder, protein powder, coffee powder, traditional Chinese medicine powder, and some new energy material powders, the particles are more likely to form powder particles with a larger agglomeration size. These particles usually have greater mass and kinetic inertia. When they enter the separation chamber 34 eccentrically with the suction airflow, the stronger... The inertia of motion makes it difficult for the particles to change their trajectory in time with the swirling airflow, and they are prone to continue moving towards the inner wall of the separation chamber 34 and colliding. Some particles may also adhere to the inner wall of the separation chamber 34 due to their strong adhesion properties. As a result, the product powder that has escaped from the packaging bag 1 and needs to be returned through the first docking groove 361 in the subsequent return stage may remain in the separation chamber 34 and be difficult to return to the packaging bag 1 in the normal return process, thereby reducing the actual recovery degree of the escaped powder and affecting the utilization rate of product powder in the high-speed vacuum packaging process.

[0046] like Figure 2 , Figures 4 to 8 The vacuum chamber 211 is equipped with a sorting assembly 5, which includes a second connecting pipe 51 and a settling chamber 52. The upper left side of the separation chamber 34 is provided with the second connecting pipe 51, and the settling chamber 52 is provided to the left of the second connecting pipe 51. The upper end of the separation chamber 34 and the upper end of the settling chamber 52 are fixedly connected by the second connecting pipe 51. An electrically controlled valve is installed inside the second connecting pipe 51. The second connecting pipe 51 is used to connect the interior of the separation chamber 34 with the interior of the settling chamber 52, and to allow airflow into the separation chamber 34. The easily adhering powder particles with a larger agglomeration size at the upper end enter the settling chamber 52; among them, the easily adhering powder particles with a larger agglomeration size have higher mass and stronger motion inertia; the easily adhering agglomerating powder particles conveyed by the second connecting pipe 51 enter the interior of the settling chamber 52 from the upper end of the settling chamber 52, and the interior space of the settling chamber 52 is larger than the interior flow space of the second connecting pipe 51, which is used to reduce the movement speed of the easily adhering agglomerating powder particles entering the settling chamber 52 from the second connecting pipe 51.

[0047] like Figure 2 , Figures 4 to 8 A pressurizing pipe 53 is fixedly installed at the upper end of the settling chamber 52. The pressurizing pipe 53 extends vertically and passes through the upper end of the chamber body 21 and is fixedly connected to the chamber body 21. The upper end of the pressurizing pipe 53 is connected to an external pump. The pressurizing pipe 53 is used to deliver pressurized gas into the settling chamber 52. An electric control valve is installed at the lower end of the settling chamber 52.

[0048] like Figure 2 , Figure 3 , Figure 5 and Figure 6 The upper left side of the docking member 36 is fixedly connected to the lower end face of the settling chamber 52. The left end of the docking member 36 is provided with a second docking groove 362 that runs vertically through the bottom. The second docking groove 362 forms a powder conveying path between the settling chamber 52 and the packaging bag 1.

[0049] The working principle of the sorting component 5 is as follows: When high-speed air is drawn through the airflow pipe 35, the powder that escapes from the packaging bag 1 enters the upper part of the separation chamber 34 eccentrically through the guide cavity 321 and the first connecting pipe 33 with the airflow. Ordinary powder particles can continue to move with the swirling airflow and be separated and temporarily stored in the separation chamber 34. However, easily adhering powder particles with larger agglomeration particle size have a more obvious tendency to move inertia after entering the separation chamber 34 due to their larger mass and stronger inertia. At this time, the electric control valve in the second connecting pipe 51 can be opened, so that the easily adhering agglomerating powder particles located on the corresponding inertial movement path can enter the settling chamber 52 through the second connecting pipe 51 before continuing to move towards the inner wall of the separation chamber 34, thereby changing the original movement path of such particles. When easily agglomerated powder particles enter the settling chamber 52 through the second connecting pipe 51, the internal space of the settling chamber 52 is larger than the internal flow space of the second connecting pipe 51. As a result, the movement speed of the particles decreases after entering the chamber, and they gradually settle and are temporarily stored at the bottom of the settling chamber 52 under a lower collision intensity. This reduces the possibility of such particles continuing to collide with the inner wall of the separation chamber 34 at high speed and becoming agglomerated. At the same time, the remaining powder particles that move with the airflow can still be separated and temporarily stored in the separation chamber 34. This allows easily agglomerated powder particles to preferentially enter the settling chamber 52 for temporary storage, while the remaining powder particles that move with the airflow are mainly separated and temporarily stored in the separation chamber 34. After high-speed air extraction and powder collection are completed, the electric control valve in the second connecting pipe 51 and the electric control valve in the first connecting pipe 33 are closed, so that the separation chamber 34 and the settling chamber 52 are isolated from the front air extraction path. Then, pressurized gas is delivered to the separation chamber 34 and the settling chamber 52 through the airflow pipe 35 and the pressurization pipe 53 respectively, so that the internal pressure of the separation chamber 34 and the settling chamber 52 increases to higher than the internal pressure of the packaging bag 1. After reaching the corresponding return pressure state, the delivery of pressurized gas is stopped. Then, the electric control valves at the lower end of the separation chamber 34 and the settling chamber 52 are opened, and the electric control valve at the lower end of the air extraction pipe 31 is opened at the same time, so that the powder temporarily stored in the separation chamber 34 returns to the packaging bag 1 through the first docking groove 361, and the easily adhering and agglomerated powder particles temporarily stored in the settling chamber 52 return to the packaging bag 1 through the second docking groove 362. The powder recovery in the two temporary storage paths is completed while the air extraction pipe 31 performs low-disturbance air extraction.

[0050] It should be emphasized that the core improvement of this embodiment lies in: by setting the second connecting pipe 51 on the inertial movement path of easily adhering and agglomerated powder particles after they enter the separation chamber 34, these particles are preferentially allowed to enter the settling chamber 52 before continuing to move towards the inner wall of the separation chamber 34 and causing high-intensity collisions. The larger internal space of the settling chamber 52 is used to reduce their movement speed, allowing them to complete the settling and temporary storage under conditions of low collision intensity or minimal collision with the side wall of the settling chamber 52. Subsequently, the temporarily stored powder is returned to the packaging bag 1 through the second docking groove 362, thereby avoiding the retention of highly inertial easily adhering and agglomerated powder particles due to wall adhesion during the cyclone separation process, effectively improving the actual recovery rate and material utilization rate of this type of product powder.

[0051] It should be noted that the opening of the second connecting pipe 51 connecting to the separation chamber 34 is located in the area corresponding to the main inertial movement path formed after easily adhering and agglomerated powder particles enter the separation chamber 34. This allows such particles to preferentially enter the settling chamber 52 via the second connecting pipe 51 before continuing to move towards the high collision area on the inner wall of the separation chamber 34. The specific location of this opening can be determined experimentally based on the physical properties of the actual packaged powder and the airflow state inside the separation chamber 34. For example, under predetermined high-speed air extraction conditions, the movement trajectory of the powder after entering the separation chamber 34 and the adhesion distribution on the inner wall can be observed. The main inertial movement path can be determined in reverse according to the direction of concentrated movement or concentrated adhesion area of ​​the easily adhering and agglomerated powder particles, and the opening of the second connecting pipe 51 can be set at the corresponding position before the path reaches the high collision area. For powders with different particle sizes, agglomeration degrees, densities, and surface adhesion characteristics, the opening position of the second connecting pipe 51 can be adaptively adjusted according to the corresponding test results.

[0052] It should be noted that the sorting component 5 is not used to strictly classify the powder entering the separation chamber 34 by particle size or quality. Instead, it utilizes the difference in motion inertia between easily agglomerated powder particles and ordinary powder particles to allow the former to preferentially enter the settling chamber 52 for deceleration and settling, while the remaining powder particles mainly continue to undergo cyclone separation in the separation chamber 34. In actual operation, even if a small amount of ordinary powder enters the settling chamber 52 along with the easily agglomerated powder particles, it can be returned to the packaging bag 1 via the second docking groove 362 during the subsequent return process. Therefore, it is not necessary to use the complete separation of the two types of powder as the working condition of the sorting component 5.

[0053] It should be noted that during high-speed air extraction, the easily adhering powder particles that actually escape from the packaging bag 1 with the airflow and further form larger agglomerates usually only account for a small portion of the total amount of packaged powder. Therefore, the amount of powder that needs to be decelerated and settled in the settling chamber 52 is relatively limited. At the same time, because these agglomerates are larger in size and mass, their own gravity is relatively more pronounced. After entering the larger internal space of the settling chamber 52 and reducing their speed, they can settle to the bottom of the settling chamber 52 relatively quickly. Thus, even if the settling chamber 52 no longer uses the method of rapid separation by relying on high-speed swirling and strong centrifugal force, but adopts a gentler deceleration and gravity settling method, the required settling time usually will not have a significant impact on the overall completion time of the subsequent low-disturbance air extraction stage. This can reduce the risk of easily adhering agglomerates hitting and adhering to the walls while maintaining the operational efficiency of the vacuum packaging process.

[0054] It should be noted that for easily adhering powder particles that have not formed large agglomerates but still enter the separation chamber 34 with the swirling airflow, their individual particle mass and inertia are relatively small, making it easier for them to change direction with the swirling airflow in the separation chamber 34. They are less likely to maintain a strong inertial trajectory and directly impact the inner wall of the separation chamber 34. Even if some individual particles approach or contact the inner wall of the separation chamber 34, due to their small mass and relative collision kinetic energy, the probability of forming a high-intensity impact and stably adhering to the inner wall is relatively low. Therefore, this embodiment mainly establishes an independent sedimentation temporary storage path for easily adhering agglomerate powder particles that have formed large agglomerates and have strong inertia, without having all easily adhering powder particles leave the swirling separation path of the separation chamber 34.

[0055] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of the claimed application.

Claims

1. A closed-cavity vacuum automatic vacuum packaging equipment for powder materials, used for closed-cavity vacuum packaging of packaging bags (1), characterized in that: It includes a vacuum chamber (2), an air extraction assembly (3), a sealing assembly (4), and a sorting assembly (5); the vacuum chamber (2) has a vacuum cavity (211) for accommodating the packaging bag (1). The air extraction component (3) has a first air extraction passage and a second air extraction passage. The first air extraction passage is provided with a separation chamber (34) for separating and temporarily storing powder that migrates with the air extraction flow. The second air extraction passage is used to communicate with the inside of the packaging bag (1). The sealing component (4) is used to clamp and seal the opening of the packaging bag (1) located in the vacuum chamber (211); The sorting component (5) includes a second connecting pipe (51) and a settling chamber (52). The second connecting pipe (51) connects the separation chamber (34) and the settling chamber (52). The settling chamber (52) forms a temporary space for powder settling. The separation chamber (34) and the settling chamber (52) respectively form powder conveying paths for communication with the inside of the packaging bag (1).

2. The closed-cavity vacuum-type automatic vacuum packaging equipment for powder materials according to claim 1, characterized in that: The air extraction assembly (3) also includes a flow guide hood (32), a first connecting pipe (33), and an airflow pipe (35); the flow guide hood (32) is located above the opening of the packaging bag (1), and a flow guide cavity (321) with an open lower end is formed inside the flow guide hood (32). The first connecting pipe (33) connects the flow guide cavity (321) and the separation chamber (34). The airflow pipe (35) connects to the separation chamber (34) and is used to connect to an external pump, so that the air in the vacuum chamber (211) and the packaging bag (1) as well as the powder that escapes with the airflow enter the separation chamber (34) in sequence through the flow guide cavity (321) and the first connecting pipe (33).

3. The closed-cavity vacuum-type automatic vacuum packaging equipment for powder materials according to claim 1, characterized in that: The air extraction assembly (3) also includes an air extraction pipe (31) forming a second air extraction passage. The lower end of the air extraction pipe (31) is used to extend into the opening of the packaging bag (1) and is equipped with an electric control valve. The upper end of the air extraction pipe (31) is used to connect to an external pump.

4. The closed-cavity vacuum-type automatic vacuum packaging equipment for powder materials according to claim 2, characterized in that: The first connecting pipe (33) is eccentrically connected to the upper part of the separation chamber (34) so ​​that the air entering the separation chamber (34) through the first connecting pipe (33) and the powder it carries form a swirling motion in the separation chamber (34).

5. The closed-cavity vacuum automatic vacuum packaging equipment for powder materials according to claim 4, characterized in that: The opening of the second connecting pipe (51) connecting to the separation chamber (34) is located in the area corresponding to the inertial movement path of the agglomerated powder particles after entering the separation chamber (34).

6. The closed-cavity vacuum automatic vacuum packaging equipment for powder materials according to claim 5, characterized in that: The settling chamber (52) has a powder settling space that is larger than the internal flow space of the second connecting pipe (51).

7. The closed-cavity vacuum-type automatic vacuum packaging equipment for powder materials according to claim 2, characterized in that: The first connecting pipe (33) and the second connecting pipe (51) are respectively provided with electrically controlled valves for controlling their connection state; the airflow pipe (35) is also used to deliver pressurized gas into the separation chamber (34), and the upper end of the settling chamber (52) is provided with a pressurizing pipe (53) for delivering pressurized gas into the settling chamber (52); the lower ends of the separation chamber (34) and the settling chamber (52) are respectively provided with electrically controlled valves for controlling the on / off of the corresponding powder conveying path.

8. The closed-cavity vacuum-type automatic vacuum packaging equipment for powder materials according to claim 1, characterized in that: The air extraction assembly (3) also includes a docking part (36). The right end of the docking part (36) is connected to the lower end of the separation chamber (34), and the left end of the docking part (36) is connected to the lower end of the settling chamber (52). The docking part (36) is provided with a first docking groove (361) and a second docking groove (362) that are connected vertically. The first docking groove (361) is used to connect the separation chamber (34) and the inside of the packaging bag (1), and the second docking groove (362) is used to connect the settling chamber (52) and the inside of the packaging bag (1).

9. The closed-cavity vacuum automatic vacuum packaging equipment for powder materials according to claim 3, characterized in that: The vacuum assembly (3) further includes a docking part (36); the sealing assembly (4) includes a first sealing clamp (41), a second sealing clamp (42) and a third sealing clamp (43); the first sealing clamp (41) is used to clamp one end of the bag opening of the packaging bag (1) to the outside of the docking part (36), the second sealing clamp (42) is used to clamp the other end of the bag opening of the packaging bag (1) to the outside of the vacuum tube (31), and the third sealing clamp (43) is disposed between the first sealing clamp (41) and the second sealing clamp (42) and is used to clamp the area where the bag opening of the packaging bag (1) is located between the first sealing clamp (41) and the second sealing clamp (42).

10. The closed-cavity vacuum-type automatic vacuum packaging equipment for powder materials according to claim 9, characterized in that: The vacuum chamber (2) includes a chamber body (21) and a chamber door (22); two first sealing clamps (41), two second sealing clamps (42) and three third sealing clamps (43) are provided and are respectively arranged in front and behind. The first sealing clamp (41) on the front side is driven to move back and forth by a first electric push rod fixed to the chamber body (21), and the first sealing clamp (41) on the rear side is fixed to the chamber door (22). The second sealing clamp (42) on the front side is driven to move back and forth by a second electric push rod fixed to the chamber body (21), and the second sealing clamp (42) on the rear side is fixed to the chamber door (22). The two third sealing clamps (43) are both movably arranged in the front and back direction. The third sealing clamp (43) on the front side is driven to move back and forth by a third electric push rod fixed to the chamber body (21), and the third sealing clamp (43) on the rear side is driven to move back and forth by a fourth electric push rod fixed to the chamber door (22).

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