A pressurized filling device of a cat gus filling machine

Abstract

This invention relates to the technical field of filling structures, and in particular to a pressurized filling device for a cat bar filling machine, comprising a conveying pipe assembly, including a main pipe and an inner pipe located inside the main pipe. The filling material is conveyed in the inner pipe and discharged into the packaging bag through an opening at the bottom of the inner pipe. A channel is formed between the main pipe and the inner pipe for the discharge of gas and excess material from the packaging bag. By setting a channel between the main pipe and the inner pipe, excess air in the packaging bag can be discharged through the channel, reducing residual air in the packaging bag, preventing residual air from occupying the internal space of the packaging bag, and increasing the material filling volume. At the same time, the channel can also be used to discharge excess material from the packaging bag, so that the material in the packaging bag has a certain pressure, increasing the density of the material in the packaging bag, and thus increasing the material filling rate per unit volume of the packaging bag.

Description

Technical Field

[0001] This invention relates to the technical field of filling structures, and in particular to a pressurized filling device for a cat bar filling machine. Background Technology

[0002] Cat treats, a popular pet snack, typically contain semi-liquid, minced meat. Cat treat filling machines are automated packaging equipment specifically designed to quantitatively fill such materials into strip-shaped packaging bags. The filling accuracy and quality directly affect the product yield and consumer experience.

[0003] Currently, commonly used cat treat filling machines generally use suction pumps or screw conveyors to transport materials from the storage tank to the vertically set filling pipe during the filling operation. The opening at the bottom of the filling pipe is aligned with the opening of the packaging bag to be filled. After the material is discharged from the opening, it falls naturally into the packaging bag under the action of gravity, thus completing the filling process.

[0004] However, during the process of material falling into the packaging bag, the original air inside the bag cannot be discharged in time and fully. Some air is trapped inside the material or remains between the material and the bag wall, forming air pockets. After the packaging bag is sealed, these residual air occupy a certain volume of the bag, directly resulting in insufficient effective material filling and difficulty in meeting the nominal net content requirements. At the same time, since the material only relies on gravity to flow into the bag naturally, there is a lack of external driving force to compact it, resulting in low density of the material inside the packaging bag after filling and low material filling rate per unit volume of the packaging bag, which limits the effective utilization rate of the packaging bag. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a pressure filling device for a cat treat filling machine, the specific technical solution of which is as follows: A pressurized filling device for a cat treat filling machine according to the present invention includes: The conveying pipe assembly includes a main pipe and an inner pipe located inside the main pipe. The filling material is conveyed in the inner pipe and discharged into the packaging bag through the bottom opening of the inner pipe. A channel is formed between the main pipe and the inner pipe for the discharge of gas and excess material from the packaging bag. The pressurizing unit includes a cylinder and a piston. The cylinder stores filling material, and the material is pressurized and conveyed into the inner tube under the push of the piston. The sealing unit seals the opening of the packaging bag fitted onto the bottom opening of the inner tube.

[0006] Furthermore, the sealing unit includes at least two opposing extrusion plates and a cylinder for pushing the extrusion plates apart. The extrusion plates have an arcuate portion and a flat portion. The arcuate portion cooperates with the outer wall of the main tube. Adjacent extrusion plates are fitted together through the flat portion, so that the extrusion plates form a compression seal at the opening of the packaging bag.

[0007] Furthermore, the inner tube moves vertically within the main tube via a drive unit. As the inner tube moves from bottom to top, the material discharged from the bottom opening of the inner tube is filled from the bottom of the packaging bag upwards.

[0008] Furthermore, the bottom opening of the inner tube is configured as a flat opening corresponding to the shape of the packaging bag.

[0009] Furthermore, the conveying pipe assembly also includes a sealing body and a sealing plate. The sealing body is fixedly installed relative to the main pipe by a support rod. The sealing body is located inside the inner pipe, and the sealing plate is installed on the outer wall of the inner pipe. When the flat opening moves to a predetermined position, the sealing body and the sealing plate respectively block the flat opening and the channel.

[0010] Furthermore, the main tube is connected to the barrel via a secondary tube, the inner tube slides within the secondary tube and isolates the channel from the barrel, and the top of the inner tube communicates with the barrel via the secondary tube; The main pipe is equipped with a discharge pipe that guides and discharges the gas and excess material in the channel.

[0011] Furthermore, the drive unit includes a beam bridge disposed on the material cylinder, and a push-pull arm one and a push-pull arm two slidably disposed on the beam bridge. The push-pull arm one and the push-pull arm two are respectively connected to the inner tube and the piston. The push-pull arm one and the push-pull arm two are driven by a rotating body located between them, so that when the piston pushes and squeezes the material in the material cylinder through the oil cylinder, the inner tube moves upward synchronously. The pressurizing unit also includes a feed pipe connected to the material cylinder, and both the feed pipe and the inner pipe are provided with control structures that limit the unidirectional flow of materials.

[0012] Furthermore, a variable diameter body is coaxially arranged on the rotating body. The rotating body is adjustablely mounted on the beam bridge by fasteners. During the adjustment process, the second push-pull arm makes transmission contact with different positions on the variable diameter body to change the transmission ratio between the rotating body and the second push-pull arm, as well as the relative moving speed between the piston and the inner tube. The beam bridge has a notch, and a movable sleeve is slidably disposed in the notch. The second push-pull arm passes through the movable sleeve and is rotatably connected to the piston through a secondary rod. During the adjustment of the rotating body, the movable sleeve moves in the notch, and the movable sleeve, through the tension provided by the second spring, causes the second push-pull arm to abut against the variable diameter body.

[0013] The beneficial effects of this invention are as follows: By setting a channel between the main tube and the inner tube, excess air inside the packaging bag can be discharged through the channel, reducing residual air inside the packaging bag and preventing residual air from occupying the internal space of the packaging bag, thereby increasing the material filling capacity. At the same time, this channel can also be used to export excess material inside the packaging bag, so that the material inside the packaging bag has a certain pressure, increasing the density of the material inside the packaging bag, and thus increasing the material filling rate per unit volume of the packaging bag. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the pressure filling device of a cat bar filling machine; Figure 2 for Figure 1 A structural diagram from another perspective; Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the central conveying pipe assembly; Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure of the middle auxiliary tube; Figure 5 for Figure 4 A structural diagram from another perspective; Figure 6 for Figure 1 Schematic diagram of the intermediate pressurization unit; Figure 7 for Figure 6 Schematic diagram of the Zhongliang Bridge and its superstructure; Figure 8 for Figure 6 Schematic diagram of the structure of a rotating body; Figure label: 1. Conveying pipe assembly; 2. Pressurizing unit; 3. Sealing unit; 4. Main pipe; 5. Inner pipe; 6. Material cylinder; 7. Piston; 8. Cylinder; 9. Extrusion plate; 10. Drive unit; 11. Flat end; 12. Support rod; 13. Sealing body; 14. Sealing disc; 15. Discharge pipe; 16. Secondary pipe; 17. Beam bridge; 18. Push-pull arm one; 19. Push-pull arm two; 20. Rotating body; 21. Hydraulic cylinder; 22. Feed pipe; 23. Check valve; 24. Disc one; 25. Disc two; 26. Spring one; 27. Material inlet; 28. Isolation sleeve; 29. ​​Variable diameter body; 30. Moving sleeve; 31. Spring two; 32. Secondary rod. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0018] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0019] like Figure 1-8 As shown, a pressurized filling device for a cat treat filling machine includes: The conveying pipe assembly 1 includes a main pipe 4 and an inner pipe 5 located inside the main pipe 4. The filling material is conveyed in the inner pipe 5 and discharged into the packaging bag through the bottom opening of the inner pipe 5. A channel is formed between the main pipe 4 and the inner pipe 5 for the gas and excess material in the packaging bag to be discharged. The pressurizing unit 2 includes a material cylinder 6 and a piston 7. The material cylinder 6 stores the filling material, and the material is pressurized and conveyed into the inner tube 5 under the push of the piston 7. The sealing unit 3 seals the opening of the packaging bag fitted onto the bottom opening of the inner tube 5.

[0020] In this embodiment, the pressurizing unit 2, the conveying pipe assembly 1, and the sealing unit 3 are arranged sequentially from top to bottom. The pressurizing unit 2 is connected to an external storage tank, allowing materials to be introduced into the pressurizing unit 2. After being pressurized by the pressurizing unit 2, the materials can be conveyed downward through the conveying pipe assembly 1 to the packaging bag located at the bottom of the conveying pipe assembly 1, thus realizing the filling of materials. The bottom of the conveying pipe assembly 1 can be located inside the packaging bag. The sealing unit 3 squeezes the opening of the packaging bag to the bottom of the conveying pipe assembly 1 and achieves the sealing of the packaging bag.

[0021] Specifically, the main pipe 4 and inner pipe 5 in the conveying pipe assembly 1 are coaxial and vertically arranged. The inner pipe 5 is located inside the main pipe 4, and the internal space of the inner pipe 5 can be used to convey materials downward. The outer wall of the inner pipe 5 and the inner wall of the main pipe 4 form a channel. When the material is filled into the packaging bag, the original air in the packaging bag can enter the channel. After the packaging bag is full, the excess material can also enter the channel. The movement of the excess material creates a certain pressure inside the inner pipe 5 and the material in the packaging bag, thereby achieving the effect of pressurizing and solidifying the material in the packaging bag. The discharge of excess air in the packaging bag allows the packaging bag to hold more material and prevents the substances in the residual air in the packaging bag from causing the material to deteriorate after long-term storage.

[0022] In the pressurizing unit 2, the material cylinder 6 is fixedly positioned relative to the main pipe 4. The material cylinder 6 is used to temporarily store materials. The piston 7 can move inside the material cylinder 6 and provide pushing force to the materials. The top of the inner pipe 5 is connected to the material cylinder 6, allowing the material being compressed inside the material cylinder 6 to enter the inner pipe 5, thereby realizing the pressurized conveying function of the materials; Figure 6 As shown, the bottom of the material cylinder 6 is sealed, and the piston 7 and the bottom of the material cylinder 6 form a closed space for temporarily storing materials. The top of the material cylinder 6 is open, so that the pressure in the space above the piston 7 remains constant when the piston 7 moves. Of course, the above embodiment is only an example of the operation method and is not intended to limit the scope of protection. For example, the top of the material cylinder 6 can also be sealed, and the piston 7 and the top of the material cylinder 6 can form a closed space. This embodiment is also within the scope of protection of this invention.

[0023] Because the material inside the packaging bag has a certain pressure during filling, in order to prevent the material from overflowing through the bag opening, the sealing unit 3 needs to seal the bag opening. This sealing work should not affect the continuous filling process. Therefore, after the bottom opening of the inner tube 5 is inserted into the packaging bag, the bag opening needs to be sealed on the outer wall of the inner tube 5. Specifically, the sealing unit 3 can seal the bag opening by squeezing.

[0024] By setting a channel between the main tube 4 and the inner tube 5, excess air in the packaging bag can be discharged through the channel, reducing residual air in the packaging bag and preventing residual air from occupying the internal space of the packaging bag, thereby increasing the material filling capacity. At the same time, this channel can also be used to export excess material in the packaging bag, so that the material in the packaging bag has a certain pressure, increasing the density of the material in the packaging bag, and thus increasing the material filling rate per unit volume of the packaging bag.

[0025] As a preferred embodiment of the above, see Figure 2 The sealing unit 3 includes at least two extrusion plates 9 arranged opposite each other, and a cylinder 8 for pushing the extrusion plates 9 away. The extrusion plates 9 have an arc-shaped part and a flat part. The arc-shaped part cooperates with the outer wall of the main pipe 4. The two adjacent extrusion plates 9 are attached to each other through the flat part, so that the extrusion plates 9 form an extrusion seal at the bag opening of the packaging bag.

[0026] In the embodiment corresponding to the sealing of the bag opening position of the packaging bag by the sealing unit 3, the sealing unit 3 may specifically include a cylinder 8 and a compression plate 9. The number of compression plates 9 may be two or more, and each compression plate 9 is equipped with at least one cylinder 8. Taking two compression plates 9 as an example, the two compression plates 9 are arranged opposite each other on both sides of the axis of the main tube 4. The cylinder 8 provides support for the compression plates 9, and when the cylinder 8 extends or retracts, the compression plates 9 move closer to or away from the main tube 4. The arc-shaped part on the compression plate 9 corresponds to the shape of the outer wall of the main tube 4, so that the arc-shaped part can squeeze and adhere part of the bag opening position of the packaging bag to the outer wall of the main tube 4. The flat part of the compression plate 9 can fit with the flat part on the adjacent compression plate 9, so that the flat parts on the two compression plates 9 can squeeze other bag opening positions of the packaging bag, thereby achieving a complete seal of the bag opening position of the packaging bag, while allowing the bottom opening of the main tube 4 and the bottom opening of the inner tube 5 to be located inside the packaging bag.

[0027] In the above embodiments, to improve sealing performance, a sealing ring can be added to the lower side of the outer wall of the main pipe 4, and the sealing effect on the packaging bag can be enhanced by the cooperation between the sealing ring and the arc-shaped part on the extrusion plate 9.

[0028] As a preferred embodiment of the above, the inner tube 5 moves vertically within the main tube 4 via the drive unit 10. During the upward movement of the inner tube 5, the material discharged from the bottom opening of the inner tube 5 is filled from the bottom of the packaging bag upwards.

[0029] In this preferred embodiment, the inner tube 5 can move up and down along the axis of the main tube 4 within the main tube 4, and the drive unit 10 can provide power for the movement of the inner tube 5. The drive unit 10 can specifically be a structure such as a motor, lead screw, or cylinder.

[0030] During implementation, the bottom opening of the inner tube 5 can be moved down to the lower side of the inside of the packaging bag, so that the opening is close to the bottom of the packaging bag. In this way, the material discharged from the opening can first fill the bottom of the packaging bag. As the material is continuously filled, the inner tube 5 moves up synchronously under the drive of the drive unit 10. The material gradually fills the packaging bag from bottom to top, and the air in the packaging bag is squeezed out from bottom to top, thereby further reducing air residue.

[0031] As a preferred embodiment of the above, see Figure 2 The bottom opening of the inner tube 5 is set as a flat opening 11 that corresponds to the shape of the packaging bag.

[0032] Since the two ends of the packaging bag are generally flat in the length direction, when the material is filled, the inner tube 5 moves down to the lower side of the inside of the packaging bag. If the bottom opening of the inner tube 5 is round or has a large diameter, there will be a movement distance between the opening and the bottom of the packaging bag. In order to make the opening closer to the bottom of the packaging bag during filling, the opening can be set as a flat opening 11.

[0033] As a preferred embodiment of the above, see Figure 3 The conveying pipe assembly 1 also includes a sealing body 13 and a sealing plate 14. The sealing body 13 is fixedly installed relative to the main pipe 4 via a support rod 12. The sealing body 13 is located inside the inner pipe 5, and the sealing plate 14 is installed on the outer wall of the inner pipe 5. When the flat opening 11 moves to the specified position, the sealing body 13 and the sealing plate 14 respectively block the flat opening 11 and the channel.

[0034] In this embodiment, the support rod 12 is fixedly arranged relative to the main pipe 4 and the material cylinder 6, the sealing body 13 is installed at the bottom of the support rod 12, and the shape of the sealing body 13 corresponds to the shape of the flat opening 11; the sealing plate 14 is installed on the outer wall of the inner tube 5, and its diameter corresponds to the outer diameter of the main pipe 4.

[0035] During the downward or upward movement of the inner tube 5, the sealing body 13 separates from the flat opening 11, and the sealing plate 14 separates from the bottom of the main tube 4. At this time, both the flat opening 11 and the channel can communicate with the inside of the packaging bag. When the inner tube 5 moves up to the initial position, the sealing body 13 blocks the flat opening 11, so that the material in the inner tube 5 no longer flows out, and the sealing plate 14 blocks the channel, so that the material in the channel cannot flow out, thereby facilitating the replacement of the packaging bag.

[0036] It should be noted that since the packaging bag is continuously heat-sealed at the bottom opening of the inner tube 5, and there is little material adhering to the outer wall of the sealing plate 14 and the flat opening 11, this part of the material will not be wasted.

[0037] As a preferred embodiment of the above, see Figure 1 The main pipe 4 is connected to the barrel 6 through the auxiliary pipe 16. The inner pipe 5 slides inside the auxiliary pipe 16 and isolates the channel from the barrel 6. The top of the inner pipe 5 is connected to the barrel 6 through the auxiliary pipe 16. The main pipe 4 is equipped with a discharge pipe 15 that guides and discharges the gas and excess material in the channel.

[0038] In this embodiment, the top opening of the inner tube 5 is located inside the secondary tube 16. The inner wall of the secondary tube 16 slides in contact with the outer wall of the inner tube 5, preventing the material cylinder 6 from directly communicating with the channel through the secondary tube 16. This isolates the channel and prevents the material in the material cylinder 6 from directly entering the channel. After being squeezed, the material in the material cylinder 6 can directly enter the inner tube 5 through the secondary tube 16. In this process, the secondary tube 16 serves to connect the main tube 4 and the material cylinder 6, as well as guide the inner tube 5. The discharge pipe 15 is installed on the side wall of the main tube 4. The material and air in the channel can be discharged to the external collection device through the discharge pipe 15 for material recycling.

[0039] As a preferred embodiment of the above, see Figure 6-8 The drive unit 10 includes a beam bridge 17 disposed on the material cylinder 6, and a push-pull arm 18 and a push-pull arm 29 slidably disposed on the beam bridge 17. The push-pull arm 18 and the push-pull arm 29 are respectively connected to the inner tube 5 and the piston 7. The push-pull arm 18 and the push-pull arm 29 are driven by a rotating body 20 located between them, so that when the piston 7 pushes and squeezes the material in the material cylinder 6 through the oil cylinder 21, the inner tube 5 moves upward synchronously. The pressurizing unit 2 also includes a feed pipe 22 connected to the material cylinder 6. Both the feed pipe 22 and the inner pipe 5 are equipped with control structures that limit the unidirectional flow of materials.

[0040] In this embodiment, the top of the material cylinder 6 is open, the beam bridge 17 is located at the top of the material cylinder 6, the bottom of the push-pull arm 18 passes through the beam bridge 17 and the piston 7 and is connected to the top of the inner tube 5, and the push-pull arm 29 passes through the beam bridge 17 and is connected to the top of the piston 7. Thus, by controlling the push-pull arm 18 and the push-pull arm 29, the movement of the piston 7 and the inner tube 5 can be controlled. The rotating body 20 is located between the push-pull arm 18 and the push-pull arm 29, and the rotating body 20 is rotatably mounted on the beam bridge 17. The side walls of the push-pull arm 18 and the push-pull arm 29 are in transmission contact with the outer wall of the rotating body 20, and the transmission method can be gear transmission, friction transmission, etc. The rotating body 20 can specifically be a rotating column, a rotating wheel, or other structures.

[0041] The hydraulic cylinder 21 connects the beam bridge 17 and the piston 7. When the hydraulic cylinder 21 extends or retracts, the piston 7 moves synchronously. The piston 7 drives the inner tube 5 to move synchronously in the opposite direction through the push-pull arm 2 19, the rotating body 20 and the push-pull arm 1 18. Thus, when the piston 7 squeezes and pushes the material, the inner tube 5 moves synchronously upward. Of course, the above implementation method is only an example of one implementation method and is not intended to limit the scope of protection. For example, the hydraulic cylinder 21 can also drive the piston 7 and the inner tube 5 to move by driving the push-pull arm 1 18 or the push-pull arm 2 19. All of these are within the scope of protection of this case.

[0042] In the above embodiments, the feed pipe 22 can supply material to the cylinder 6. The control structure on the feed pipe 22 can be a one-way valve 23, so that when material is fed into the cylinder 6 through the feed pipe 22, the one-way valve 23 will not obstruct the material. However, when the piston 7 squeezes the material, the one-way valve 23 restricts the flow direction of the material, preventing the material in the cylinder 6 from entering the feed pipe 22; similarly... Figure 4-5 As shown, when the piston 7 moves in the reverse direction and draws the material in the feed pipe 22 into the feed cylinder 6, the control structure on the inner tube 5 restricts the material in the inner tube 5 from entering the feed cylinder 6. However, when the piston 7 squeezes the material in the feed cylinder 6, the material in the feed cylinder 6 can normally enter the inner tube 5.

[0043] In the embodiment corresponding to the above-mentioned control structure that limits the material flow direction within the inner tube 5, the control structure may specifically include a disc body 24 disposed at the top of the inner tube 5 and a disc body 25 located inside the inner tube 5 and cooperating with the disc body 24. The disc body 25 can slide on the support rod 12, and the top of the support rod 12 can be fixed to the beam bridge 17. Both the disc body 24 and the disc body 25 have a material inlet 27, and the disc body 24 seals the material inlet 27 on the disc body 25. When blocked, disc body 25 simultaneously blocks the material inlet 27 on disc body 1 24, so that disc body 1 24 and disc body 25 form a blockage on the top of the inner tube 5; disc body 25 is connected to the support rod 12 through spring 1 26. When piston 7 squeezes the material, the material overcomes the elastic force of spring 1 26 and pushes disc body 25 away from disc body 1 24, so that the material can enter the inner tube 5 through the corresponding material inlet 27; an isolation sleeve 28 can also be set on the outside of spring 1 26 to protect spring 1 26.

[0044] As a preferred embodiment of the above, see Figure 6-8 A variable diameter body 29 is coaxially arranged on the rotating body 20. The rotating body 20 is adjustablely mounted on the beam bridge 17 by fasteners. During the adjustment process, the push-pull arm 19 and the variable diameter body 29 make transmission contact at different positions to change the transmission ratio between the rotating body 20 and the push-pull arm 19, as well as the relative movement speed between the piston 7 and the inner tube 5. A notch is provided on the beam bridge 17, and a movable sleeve 30 is slidably installed in the notch. The push-pull arm 19 passes through the movable sleeve 30 and is rotatably connected to the piston 7 through the auxiliary rod 32. During the adjustment of the rotating body 20, the movable sleeve 30 moves in the notch. The movable sleeve 30 is pulled by the spring 31, so that the push-pull arm 19 abuts against the variable diameter body 29.

[0045] In the above embodiments, the variable diameter body 29 can be a cone; the rotating body 20 can move along its own axis; the fasteners between the rotating body 20 and the beam bridge 17 can be bolts, nuts, elongated holes, etc.; the diameters of different positions on the variable diameter body 29 are different along the axis of the rotating body 20; the sliding direction of the movable sleeve 30 in the notch can be perpendicular to or at an angle to the axis of the rotating body 20. Thus, when the rotating body 20 moves, the push-pull arm 19 can contact different positions on the variable diameter body 29, and the distance between the push-pull arm 19 and the axis of the rotating body 20 changes, thereby synchronously adjusting the position of the movable sleeve 30 in the notch. Since the movable sleeve 30 and the push-pull arm 19 can move in the notch, the push-pull arm 19 and the piston 7 need to be rotatably connected through the auxiliary rod 32. The spring 31 can provide elastic force to the movable sleeve 30, so that the push-pull arm 19 and the variable diameter body 29 remain in a contact transmission state.

[0046] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pressurized filling device for a cat treat filling machine, characterized in that, include: The conveying pipe assembly includes a main pipe and an inner pipe located inside the main pipe. The filling material is conveyed in the inner pipe and discharged into the packaging bag through the bottom opening of the inner pipe. A channel is formed between the main pipe and the inner pipe for the discharge of gas and excess material from the packaging bag. The pressurizing unit includes a cylinder and a piston. The cylinder stores filling material, and the material is pressurized and conveyed into the inner tube under the push of the piston. The sealing unit seals the opening of the packaging bag fitted onto the bottom opening of the inner tube.

2. The pressurized filling device for a cat treat filling machine according to claim 1, characterized in that, The sealing unit includes at least two opposing extrusion plates and a cylinder for pushing the extrusion plates apart. The extrusion plates have an arcuate portion and a flat portion. The arcuate portion mates with the outer wall of the main tube. Adjacent extrusion plates are fitted together through the flat portion, so that the extrusion plates form a compression seal at the opening of the packaging bag.

3. The pressurized filling device for a cat treat filling machine according to claim 2, characterized in that, The inner tube moves vertically within the main tube via a drive unit. As the inner tube moves from bottom to top, the material discharged from the bottom opening of the inner tube is filled from the bottom of the packaging bag upwards.

4. The pressurized filling device for a cat treat filling machine according to claim 3, characterized in that, The bottom opening of the inner tube is set as a flat opening corresponding to the shape of the packaging bag.

5. The pressurized filling device for a cat treat filling machine according to claim 4, characterized in that, The conveying pipe assembly also includes a sealing body and a sealing plate. The sealing body is fixedly installed relative to the main pipe by a support rod. The sealing body is located inside the inner pipe, and the sealing plate is installed on the outer wall of the inner pipe. When the flat opening moves to a specified position, the sealing body and the sealing plate respectively block the flat opening and the channel.

6. The pressurized filling device for a cat treat filling machine according to claim 1, characterized in that, The main tube is connected to the material cylinder via a secondary tube. The inner tube slides within the secondary tube and isolates the channel from the material cylinder. The top of the inner tube communicates with the material cylinder via the secondary tube. The main pipe is equipped with a discharge pipe that guides and discharges the gas and excess material in the channel.

7. The pressurized filling device for a cat treat filling machine according to claim 3, characterized in that, The drive unit includes a beam bridge disposed on the material cylinder, and a push-pull arm one and a push-pull arm two slidably disposed on the beam bridge. The push-pull arm one and the push-pull arm two are respectively connected to the inner tube and the piston. The push-pull arm one and the push-pull arm two are driven by a rotating body located between them, so that when the piston pushes and squeezes the material in the material cylinder through the oil cylinder, the inner tube moves upward synchronously. The pressurizing unit also includes a feed pipe connected to the material cylinder, and both the feed pipe and the inner pipe are provided with control structures that limit the unidirectional flow of materials.

8. The pressurized filling device for a cat treat filling machine according to claim 7, characterized in that, A variable diameter body is coaxially arranged on the rotating body. The rotating body is adjustablely mounted on the beam bridge by fasteners. During the adjustment process, the second push-pull arm makes transmission contact with different positions on the variable diameter body to change the transmission ratio between the rotating body and the second push-pull arm, as well as the relative movement speed between the piston and the inner tube. The beam bridge has a notch, and a movable sleeve is slidably disposed in the notch. The second push-pull arm passes through the movable sleeve and is rotatably connected to the piston through a secondary rod. During the adjustment of the rotating body, the movable sleeve moves in the notch, and the movable sleeve, through the tension provided by the second spring, causes the second push-pull arm to abut against the variable diameter body.

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