Powder discharging head of linear filling machine

Abstract

The invention relates to the technical field of powder filling, in particular to a powder discharging head of a linear filling machine, which comprises a discharging inner pipe, a discharging outer pipe and a sealing assembly. Wherein a discharging opening is formed in one end of the discharging inner pipe, and the other end of the discharging inner pipe is used for being communicated with a filling mechanism; the discharging inner pipe is sleeved with the discharging outer pipe, a negative pressure channel is formed between the circumferential inner wall of the discharging outer pipe and the circumferential outer wall of the discharging inner pipe, the end, close to the discharging opening, of the negative pressure channel is open, and the negative pressure channel communicates with a vacuumizing assembly; the sealing assembly is arranged on the discharging outer pipe and used for blocking the tank body. The milk powder filling device has the effect of improving the milk powder filling efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of powder filling, and in particular to a lower powder head of a linear filling machine. Background Art

[0002] At present, milk powder is an important source of nutrition for infants and young children, and its production and filling process have extremely high technical requirements. After milk powder is produced, it is mostly contained in cans, and milk powder filling mostly adopts automatic filling production lines. The automatic filling production line includes a conveying mechanism, a filling mechanism and a sealing mechanism. The conveying mechanism transports the empty can to the filling mechanism, and the filling mechanism is connected to a powder head. The filling mechanism fills the milk powder into the can through the powder head. The conveying mechanism then transports the filled can to the sealing mechanism, and the sealing mechanism seals the can to complete the filling production of milk powder. However, in the process of milk powder filling, there is usually a problem of milk powder bridging. Milk powder bridging refers to the formation of an arched structure in the powder head during the powder feeding process due to electrostatic effects, uneven humidity or friction between particles, which causes the flow of milk powder to be blocked, affecting the filling efficiency and uniformity.

[0003] Therefore, a powder lowering head of a linear filling machine is badly needed. Summary of the invention

[0004] In order to improve the efficiency of milk powder filling, the present application provides a powder feeding head of a linear filling machine.

[0005] The present application provides a powder lower head of a linear filling machine, which adopts the following technical solution: A powder feeding head of a linear filling machine, comprising: A material discharge inner tube, one end of which is provided with a material discharge port, and the other end of which is used to communicate with a filling mechanism; An outer tube for material discharge is sleeved on the inner tube for material discharge, a negative pressure channel is formed between the circumferential inner wall of the outer tube for material discharge and the circumferential outer wall of the inner tube for material discharge, the negative pressure channel is opened at one end close to the material discharge port, and the negative pressure channel is connected to a vacuum pumping component; A sealing component is arranged on the outer feeding tube, and the sealing component is used to seal the tank body.

[0006] By adopting the above technical solution, when milk powder needs to be filled in the tank, the sealing component is first pressed against the tank to form a closed space in the tank, and then the milk powder enters the discharge inner tube from the filling mechanism and flows into the tank through the discharge port. In this process, the vacuum component can evacuate the tank through the negative pressure channel to form a negative pressure in the tank, so that the external air pressure squeezes the milk powder in the discharge inner tube to speed up the falling speed of the milk powder, and is conducive to reducing the possibility of bridging problems of milk powder during the discharge process, thereby helping to improve the milk powder filling efficiency.

[0007] Optionally, a slide groove is provided on the inner tube of the discharge material along its own axial direction, and an opening and closing assembly is arranged on the inner tube of the discharge material, and the opening and closing assembly includes an opening and closing part and a connecting part. The opening and closing part is arranged in the inner tube of the discharge material and close to the discharge port. The connecting part is slidably passed through the slide groove and connected to the opening and closing part. One end of the connecting part is connected to a driving part, and the driving part can drive the opening and closing part to move through the connecting part so that the opening and closing part opens or closes the discharge port.

[0008] By adopting the above technical solution, when milk powder filling is required, the driving member can drive the opening and closing member to move in a direction away from the discharge port through the connecting member, so that the opening and closing member opens the discharge port to facilitate the smooth outflow of milk powder, and when milk powder filling is no longer required, the driving member drives the opening and closing member to move in the opposite direction through the connecting member, so that the opening and closing member closes the discharge port, thereby preventing the milk powder from flowing out, thereby effectively controlling the powder discharge speed and flow rate, avoiding the occurrence of milk powder bridging, ensuring the continuity and stability of the milk powder filling process, and improving the filling efficiency and uniformity.

[0009] Optionally, the opening and closing assembly includes an elastic blocking member, which is disposed in the slide groove and connected to the connecting member, and is used to close the slide groove.

[0010] By adopting the above technical solution, the elastic plugging piece is arranged in the chute and connected to the connecting piece, which can effectively close the chute when the opening and closing piece moves, prevent powder leakage, ensure the continuity and stability of the powder feeding process, and improve the filling accuracy and efficiency. At the same time, the flexible material characteristics of the elastic plugging piece enable it to fit closely to the inner wall of the chute, further enhancing the sealing performance and avoiding waste and pollution caused by powder leakage.

[0011] Optionally, the diameter of the feed opening gradually decreases in a direction away from the connecting piece.

[0012] By adopting the above technical solution, the diameter of the discharge port gradually decreases in the direction away from the connecting piece, so that when the opening and closing piece moves in the direction away from the discharge port, the distance between the opening and closing piece and the inner wall of the discharge port can gradually increase, thereby effectively controlling the powder discharge speed and flow rate to ensure the uniformity and stability of the filling process and avoid production interruptions caused by milk powder blockage.

[0013] Optionally, an isolation sleeve is sleeved on the outer tube for material discharge, and an accommodating cavity is formed between the isolation sleeve and the outer tube for material discharge, and the accommodating cavity is connected to the negative pressure channel, and the driving member includes a linkage sleeve, one end of the linkage sleeve is connected to the connecting member, and the other end of the linkage sleeve is slidably inserted in the accommodating cavity and fits against the inner wall of the accommodating cavity.

[0014] By adopting the above technical scheme, the accommodating chamber between the isolation sleeve and the outer discharge tube is connected to the negative pressure channel, so that the vacuum assembly can not only evacuate the tank body through the negative pressure channel, but also extract the gas in the accommodating chamber to form a negative pressure in the accommodating chamber, thereby driving the linkage sleeve to move. The linkage sleeve drives the opening and closing part to move away from the discharge port through the connecting part, so that the opening and closing part opens the discharge port, thereby facilitating the filling of milk powder.

[0015] Optionally, an elastic member is provided between the linkage sleeve and the inner wall of the accommodating cavity, and the elastic member is used to push the linkage sleeve to move in a direction close to the discharge port.

[0016] By adopting the above technical solution, the elastic member arranged between the linkage sleeve and the inner wall of the accommodating chamber can provide continuous thrust when the linkage sleeve is reset, ensuring that the linkage sleeve always moves in the direction close to the discharge port. When the linkage sleeve is subjected to external force, the resistance of the elastic member can be overcome to achieve the movement of the linkage sleeve, thereby controlling the opening or closing of the opening and closing member. This design not only improves the reliability and stability of the linkage sleeve action, but also effectively prevents the linkage sleeve from malfunctioning due to external interference, ensures the normal operation of the powder discharge head, and further improves the efficiency and accuracy of milk powder filling.

[0017] Optionally, the sealing assembly includes a sealing drive and a sealing ring gasket, the sealing drive is arranged on the discharge outer tube, the sealing ring gasket is slidingly sleeved on the discharge outer tube and connected to the sealing drive, and the sealing ring gasket is arranged close to the discharge port.

[0018] By adopting the above technical solution, the sealing drive can accurately control the position of the sealing ring gasket, ensuring that the sealing ring gasket fits tightly against the top of the tank during the filling process, effectively preventing milk powder from leaking during the filling process. At the same time, the sealing ring gasket is slidably mounted on the outer tube for feeding, and can respond quickly under the drive of the sealing drive, realize rapid opening and closing, and improve the filling efficiency. In addition, the design of the sealing ring gasket can also adapt to tanks of different sizes, enhancing the versatility and flexibility of the equipment.

[0019] Optionally, the sealing drive component includes a sealing sleeve and a sliding sleeve, the sealing sleeve is mounted on the discharge outer tube, the sliding sleeve is mounted on the sealing sleeve and the discharge outer tube, the sealing ring gasket is arranged on the side of the sliding sleeve close to the discharge port, and a sealed chamber is formed between the sliding sleeve and the sealing sleeve, and the sealed chamber is used to connect to the vacuum pumping component.

[0020] By adopting the above technical solution, the sealed chamber between the sliding sleeve and the sealing sleeve can be connected to the vacuum pumping component. Through the action of the vacuum pumping component, negative pressure can be generated in the sealed chamber. At this time, the sliding sleeve can slide under the action of the external air pressure and drive the sealing ring gasket to move, so that the sealing ring gasket fits tightly on the tank body, which is conducive to achieving effective sealing of the tank body, ensuring no leakage during the filling process, and improving the filling accuracy and stability.

[0021] Optionally, the inner tube for material discharge includes a plurality of tube portions which are connected in sequence, and a clamping structure is provided between adjacent tube portions, and the clamping structure is used to connect and fix two adjacent tube portions.

[0022] By adopting the above technical solution, the design of the clamping structure, on the one hand, makes it easy to disassemble and assemble the multiple tubes, thereby facilitating the cleaning of the inner tube for feeding, so as to improve the safety and hygiene during the milk powder filling process; on the other hand, it ensures the stable connection of the inner tube for feeding, avoids loosening due to vibration or other external factors during the filling process, and ensures the stability and reliability of the filling.

[0023] Optionally, a filter ring net is provided in the negative pressure channel, and the filter ring net is arranged close to the discharge port.

[0024] By adopting the above technical solution, the filter ring net in the negative pressure channel can effectively intercept impurities and large particles in the milk powder, prevent these substances from entering the negative pressure channel, avoid clogging the negative pressure channel, and ensure that the negative pressure channel is unobstructed.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the inner tube, the outer tube and the sealing assembly, negative pressure can be formed in the tank during the milk powder filling process, so that the milk powder in the inner tube can be squeezed by the external air pressure, thereby accelerating the falling speed of the milk powder and reducing the possibility of bridging of the milk powder during the feeding process, thereby improving the milk powder filling efficiency; 2. Through the cooperation of the opening and closing parts, connecting parts, driving parts, elastic sealing parts and the inner tube for feeding, the powder feeding speed and flow rate can be effectively controlled to avoid the occurrence of milk powder bridging, ensure the continuity and stability of the milk powder filling process, and improve the filling efficiency and uniformity; 3. Through the mutual cooperation of the isolation sleeve, the inner tube for feeding, the elastic part and the linkage sleeve, the vacuum assembly can not only evacuate the tank body through the negative pressure channel, but also extract the gas in the accommodating chamber to form a negative pressure in the accommodating chamber, thereby driving the linkage sleeve to move. The linkage sleeve drives the opening and closing part to move away from the feeding port through the connecting part, so that the opening and closing part opens the feeding port, thereby facilitating the filling of milk powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a lower powder head of a linear filling machine in Example 1 of the present application.

[0027] Figure 2 It is a front view of a lower powder head of a linear filling machine with a clamping structure in Example 1 of the present application.

[0028] Figure 3 is along Figure 2 Partial structural cross-sectional view along line AA.

[0029] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle.

[0030] Figure 5 It is a cross-sectional view of a lower powder head of a linear filling machine in Example 2 of the present application.

[0031] Description of reference numerals: 1. Inner tube for material discharge; 11. Material discharge port; 12. Negative pressure channel; 13. Clamping structure; 14. Clamping block; 15. Slide groove; 2. Outer tube for material discharge; 21. Filter ring net; 22. Isolation sleeve; 23. Accommodating chamber; 3. Sealing assembly; 31. Sealing drive member; 311. Sealing sleeve; 312. Sliding sleeve; 313. Sealing chamber; 32. Sealing ring gasket; 4. Opening and closing assembly; 41. Opening and closing member; 42. Connecting member; 43. Elastic sealing member; 44. Linking sleeve; 45. Elastic member. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-5 This application is described in further detail.

[0033] The embodiment of the present application discloses a powder lower head of a linear filling machine.

[0034] It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] Example 1 Reference Figure 1A powder discharge head of a linear filling machine includes a discharge inner tube 1, a discharge outer tube 2 and a sealing assembly 3. A discharge port 11 is provided at one end of the discharge inner tube 1, and the other end of the discharge inner tube 1 is used to communicate with a filling mechanism. The discharge outer tube 2 is sleeved on the discharge inner tube 1, and the sealing assembly 3 is arranged on the discharge outer tube 2 and close to the discharge port 11. The sealing assembly 3 is used to seal the tank body, thereby effectively preventing the milk powder bridging phenomenon and improving the filling efficiency and uniformity.

[0036] Reference Figure 2 and Figure 3 A negative pressure channel 12 is formed between the circumferential inner wall of the outer material discharge tube 2 and the circumferential outer wall of the inner material discharge tube 1. The negative pressure channel 12 is opened at one end close to the discharge port 11, and the negative pressure channel 12 is connected to a vacuum pumping component.

[0037] The inner tube 1 is made of stainless steel, has good corrosion resistance and wear resistance, and is suitable for long-term use in the food industry. In other embodiments, the inner tube 1 can be made of other materials, such as aluminum alloy or plastic, to adapt to different application scenarios.

[0038] Reference Figure 2 The inner tube 1 for feeding includes a plurality of tubes, which are connected in sequence, and a clamping structure 13 is provided between adjacent tubes. The clamping structure 13 is used to connect and fix two adjacent tubes, so that on the one hand, the plurality of tubes can be easily disassembled and assembled, so as to facilitate the cleaning of the inner tube 1 for feeding, and improve the safety and sanitation in the process of milk powder filling; on the other hand, the inner tube 1 for feeding is firmly connected, and loosening caused by vibration or other external factors during the filling process is avoided, so as to ensure the stability and reliability of the filling. In this embodiment, the clamping structure 13 is a clamp. In other embodiments, the clamping structure 13 can also be designed as a flange.

[0039] The inner tube 1 and the outer tube 2 are also connected and fixed by a clamping structure 13. A plurality of clamping blocks 14 are fixedly connected to the peripheral surface of the inner tube 1 at one end away from the discharge port 11. The design of the plurality of clamping blocks 14 facilitates the clamping of the inner tube 1 on the filling mechanism, thereby facilitating the quick installation of the inner tube 1 on the filling mechanism and the removal of the inner tube 1 from the filling mechanism, so as to further improve the convenience of cleaning the inner tube 1.

[0040] Reference Figure 3 The inner tube 1 for feeding is provided with an opening and closing assembly 4, which includes an opening and closing member 41, a connecting member 42 and an elastic blocking member 43. The opening and closing member 41 is slidably arranged in the inner tube 1 for feeding and is arranged close to the feeding port 11.

[0041] A chute 15 is provided on the inner tube 1 for feeding material along its own axial direction, a connecting member 42 is slidably arranged in the chute 15 and fixedly connected to the opening and closing member 41, and one end of the connecting member 42 passes through the chute 15 and is connected to a driving member. In this embodiment, the driving member is a cylinder, so that the driving member can drive the opening and closing member 41 to move through the connecting member 42, so that the opening and closing member 41 opens or closes the feeding port 11.

[0042] It should be noted that how to use the cylinder to drive the connecting member 42 to move is a conventional technical means for those skilled in the art, so it will not be described in detail in the embodiments of the present application.

[0043] The shape of the opening and closing member 41 can be adjusted as needed, for example, designed to be cylindrical, conical or hemispherical to adapt to different filling requirements. The surface of the opening and closing member 41 can be polished to reduce the adhesion of milk powder and improve cleanliness.

[0044] When milk powder filling is required, the driving member can drive the opening and closing member 41 to move away from the discharge port 11 through the connecting member 42, so that the opening and closing member 41 opens the discharge port 11 to facilitate the smooth flow of milk powder. When milk powder filling is no longer needed, the driving member drives the opening and closing member 41 to move in the opposite direction through the connecting member 42, so that the opening and closing member 41 contacts the inner wall of the discharge port 11, thereby facilitating the use of the opening and closing member 41 to close the discharge port 11, so that the milk powder no longer flows out.

[0045] Reference Figure 3 The elastic plugging member 43 is arranged in the chute 15 and fixedly connected to the connecting member 42, and the elastic plugging member 43 is used to close the chute 15. In this embodiment, the elastic plugging member 43 is made of rubber material, so that the elastic plugging member 43 can be elastically deformed, so that during the movement of the connecting member 42, the elastic plugging member 43 can always close the chute 15 to prevent powder leakage, ensure the continuity and stability of the powder feeding process, and improve the filling accuracy and efficiency. In other embodiments, the elastic plugging member 43 can also adopt a continuous corrugated structure to ensure the flexibility and ductility of the elastic plugging member 43.

[0046] The diameter of the discharge port 11 gradually decreases in the direction away from the connecting piece 42, so that when the opening and closing piece 41 moves in the direction away from the discharge port 11, the distance between the opening and closing piece 41 and the inner wall of the discharge port 11 can gradually increase, thereby effectively controlling the powder discharge speed and flow rate to ensure the uniformity and stability of the filling process and avoid production interruptions caused by milk powder blockage.

[0047] In this embodiment, the outer discharge tube 2 is made of stainless steel, and the vacuum pumping component is a vacuum pump, so that the gas in the negative pressure channel 12 can be extracted by the vacuum pumping component to form a negative pressure in the negative pressure channel 12.

[0048] When milk powder needs to be filled into the tank, the sealing component 3 is first pressed against the tank to form a closed space in the tank, and then the milk powder enters the feeding inner tube 1 from the filling mechanism and flows into the tank through the feeding port 11. In this process, the vacuum component can evacuate the tank through the negative pressure channel 12 to form a negative pressure in the tank, so that the external air pressure squeezes the milk powder in the feeding inner tube 1 to speed up the falling speed of the milk powder, and is conducive to reducing the possibility of bridging problems of milk powder during the feeding process, thereby helping to improve the milk powder filling efficiency.

[0049] The inner wall of the negative pressure channel 12 may be coated with a layer of Teflon coating to reduce the adhesion of milk powder and improve cleanliness.

[0050] Reference Figure 3 and Figure 4 A filter ring net 21 is installed between the circumferential inner wall of the feeding outer tube 2 and the circumferential outer wall of the feeding inner tube 1. The filter ring net 21 is inserted in the negative pressure channel 12 and arranged near the feeding port 11. The filter ring net 21 can effectively intercept milk powder, prevent milk powder from entering the negative pressure channel 12, avoid blocking the negative pressure channel 12, and ensure that the negative pressure channel 12 is unobstructed.

[0051] Reference Figure 1 and Figure 3 The sealing assembly 3 includes a sealing drive 31 and a sealing ring gasket 32. The sealing drive 31 is arranged on the material discharge outer tube 2, and the sealing drive 31 includes a sealing sleeve 311 and a sliding sleeve 312. The sealing sleeve 311 is sleeved on the material discharge outer tube 2, and the sliding sleeve 312 is slidingly sleeved on the sealing sleeve 311 and the material discharge outer tube 2, and a sealing chamber 313 is formed between the sliding sleeve 312 and the sealing sleeve 311, and the sealing chamber 313 is used to communicate with the vacuum pumping assembly. In this embodiment, the sealing sleeve 311 and the sliding sleeve 312 are both made of stainless steel to ensure the strength and stability of the structure.

[0052] The sealing ring gasket 32 ​​is detachably connected to the side of the sliding sleeve 312 close to the feeding port 11. In this embodiment, the sealing ring gasket 32 ​​is made of rubber material, which has good elasticity and sealing performance. In other embodiments, the sealing ring gasket 32 ​​can also be made of silicone or other highly elastic materials to adapt to different working environments.

[0053] The vacuum assembly can extract the gas in the sealed chamber 313 to generate negative pressure in the sealed chamber 313, so that the sliding sleeve 312 slides under the action of the external air pressure, and the sliding sleeve 312 drives the sealing ring gasket 32 ​​to move. Then, during the process of milk powder filling, the sliding sleeve 312 can drive the sealing ring gasket 32 ​​to fit tightly on the tank body to achieve effective sealing of the tank body, ensuring no leakage during the filling process.

[0054] In this embodiment, sealing rings are arranged between the sealing sleeve 311 , the sliding sleeve 312 and the material discharge outer tube 2 to improve the sealing performance between the sealing sleeve 311 , the sliding sleeve 312 and the material discharge outer tube 2 .

[0055] The implementation principle of the powder discharge head of a linear filling machine in the embodiment of the present application is as follows: when it is necessary to fill milk powder into the tank body, the gas in the sealing chamber 313 is first extracted by using the vacuum assembly, so that the sliding sleeve 312 drives the sealing ring gasket 32 ​​to fit on the tank body, so that a closed space is formed in the tank body. Then the driving member is started, and the driving member drives the opening and closing member 41 to move away from the discharge port 11 through the connecting member 42, so that the opening and closing member 41 opens the discharge port 11. At this time, the milk powder enters the discharge inner tube 1 from the filling mechanism and flows into the tank body through the discharge port 11. At the same time, the vacuum assembly evacuates the tank body through the negative pressure channel 12 to form a negative pressure in the tank body, so that the external air pressure squeezes the milk powder in the discharge inner tube 1 to accelerate the falling speed of the milk powder, thereby facilitating the completion of the milk powder filling.

[0056] Example 2 Reference Figure 5 The difference between this embodiment and embodiment 1 is that an isolation sleeve 22 is sleeved on the outer tube 2 for feeding.

[0057] An accommodating chamber 23 is formed between the isolation sleeve 22 and the material discharge outer tube 2, and one end of the accommodating chamber 23 away from the material discharge port 11 is connected to the negative pressure channel 12. The driving member includes a linkage sleeve 44, one end of which is fixedly connected to the connecting member 42, and the other end of which is slidably inserted in the accommodating chamber 23 and fits against the inner wall of the accommodating chamber 23.

[0058] An elastic member 45 is disposed between the linkage sleeve 44 and the inner wall of the accommodating chamber 23. In this embodiment, the elastic member 45 is a spring, so that the linkage sleeve 44 can be pushed to reset by the elastic member 45.

[0059] When the vacuum pumping assembly evacuates the tank body through the negative pressure channel 12, the vacuum pumping assembly can also extract the gas in the accommodating chamber 23 to form a negative pressure in the accommodating chamber 23, thereby driving the linkage sleeve 44 to move, and the linkage sleeve 44 applies pressure to the elastic member 45 to compress the elastic member 45. At the same time, the linkage sleeve 44 drives the opening and closing member 41 to move away from the discharge port 11 through the connecting member 42, so that the opening and closing member 41 opens the discharge port 11, thereby facilitating the filling of milk powder.

[0060] When milk powder filling is no longer needed, the vacuum assembly stops working, causing the elastic member 45 to rebound to push the linkage sleeve 44 to move. The linkage sleeve 44 drives the opening and closing member 41 to move toward the discharge port 11 through the connecting member 42, so that the opening and closing member 41 closes the discharge port 11, thereby stopping milk powder filling.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A powder lower head of a linear filling machine, characterized in that: include: A material discharge inner tube (1), one end of the material discharge inner tube (1) being provided with a material discharge port (11), and the other end of the material discharge inner tube (1) being used for communicating with a filling mechanism; An outer material discharge tube (2) is sleeved on the inner material discharge tube (1), a negative pressure channel (12) is formed between the circumferential inner wall of the outer material discharge tube (2) and the circumferential outer wall of the inner material discharge tube (1), the negative pressure channel (12) is opened at one end close to the discharge port (11), and the negative pressure channel (12) is connected to a vacuum pumping component; A sealing component (3) is arranged on the discharge outer tube (2), and the sealing component (3) is used to seal the tank body.

2. The powder lower head of a linear filling machine according to claim 1, characterized in that: The inner tube (1) for discharging material is provided with a slide groove (15) along its own axial direction, and the inner tube (1) for discharging material is provided with an opening and closing assembly (4), and the opening and closing assembly (4) comprises an opening and closing member (41) and a connecting member (42), wherein the opening and closing member (41) is arranged in the inner tube (1) for discharging material and is arranged close to the discharging port (11), and the connecting member (42) is slidably arranged in the slide groove (15) and is connected to the opening and closing member (41), and one end of the connecting member (42) is connected to a driving member, and the driving member can drive the opening and closing member (41) to move through the connecting member (42), so that the opening and closing member (41) opens or closes the discharging port (11).

3. The powder lower head of a linear filling machine according to claim 2, characterized in that: The opening and closing assembly (4) comprises an elastic blocking member (43), wherein the elastic blocking member (43) is arranged in the slide groove (15) and connected to the connecting member (42), and the elastic blocking member (43) is used to close the slide groove (15).

4. The powder lower head of a linear filling machine according to claim 2, characterized in that: The diameter of the feed opening (11) gradually decreases in a direction away from the connecting piece (42).

5. The powder lower head of a linear filling machine according to claim 2, characterized in that: An isolation sleeve (22) is sleeved on the discharge outer tube (2), and an accommodating chamber (23) is formed between the isolation sleeve (22) and the discharge outer tube (2), and the accommodating chamber (23) is communicated with the negative pressure channel (12), and the driving member comprises a linkage sleeve (44), one end of the linkage sleeve (44) is connected to the connecting member (42), and the other end of the linkage sleeve (44) is slidably inserted in the accommodating chamber (23) and fits against the inner wall of the accommodating chamber (23).

6. The powder lower head of a linear filling machine according to claim 5, characterized in that: An elastic member (45) is provided between the linkage sleeve (44) and the inner wall of the accommodating chamber (23), and the elastic member (45) is used to push the linkage sleeve (44) to move in a direction close to the discharge port (11).

7. The powder lower head of a linear filling machine according to claim 1, characterized in that: The sealing assembly (3) comprises a sealing drive component (31) and a sealing ring gasket (32); the sealing drive component (31) is arranged on the material discharge outer tube (2); the sealing ring gasket (32) is slidably sleeved on the material discharge outer tube (2) and connected to the sealing drive component (31); the sealing ring gasket (32) is arranged close to the material discharge port (11).

8. The powder lower head of a linear filling machine according to claim 7, characterized in that: The sealing drive component (31) comprises a sealing sleeve (311) and a sliding sleeve (312); the sealing sleeve (311) is sleeved on the material discharge outer tube (2); the sliding sleeve (312) is slidably sleeved on the sealing sleeve (311) and the material discharge outer tube (2); the sealing ring gasket (32) is arranged on a side of the sliding sleeve (312) close to the material discharge port (11); a sealing chamber (313) is formed between the sliding sleeve (312) and the sealing sleeve (311); the sealing chamber (313) is used to communicate with a vacuum pumping component.

9. The powder lower head of a linear filling machine according to claim 1, characterized in that: The blanking inner tube (1) comprises a plurality of tube sections which are connected in sequence, and a clamping structure (13) is provided between adjacent tube sections, wherein the clamping structure (13) is used to connect and fix two adjacent tube sections.

10. The powder lower head of a linear filling machine according to claim 1, characterized in that: A filter ring net (21) is arranged in the negative pressure channel (12), and the filter ring net (21) is arranged close to the discharge port (11).

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