Double-layer filling hopper of fine powder negative pressure packaging machine

Abstract

The utility model relates to a fine powder negative pressure packaging machine with a double-layer filling hopper. The fine powder negative pressure packaging machine comprises an inner hopper and an outer hopper. The front end of the inner hopper is gradually shrunk; and two ends of the outer hopper are sealed and fixed. And the side wall of the tail end of the inner hopper is connected with a negative pressure connecting pipe. The pushing assembly comprises a piston mechanism in the inner hopper, a piston shell is fixed to the inner wall of the inner hopper through a first connecting rod, and the tail end is connected with the negative-pressure gap through a middle pipe. Annular negative pressure holes are formed in the side wall of the front end of the inner hopper. A valve ring is arranged at the front end of the piston rod and connected with the piston rod through a second connecting rod, and a sealing part is arranged on the outer side of the valve ring and makes contact with the inner hopper wall face. The piston rod is provided with a material blocking protrusion.

Description

Technical Field

[0001] This utility model relates to a double-layer filling hopper for a negative pressure packaging machine for fine powders, belonging to the field of packaging machinery. Background Technology

[0002] Existing negative pressure packaging machines mainly involve installing pre-compacted packaging bags onto the end of the filling hopper, and then filling the material through overall vacuuming and positive pressure filling. The packaging bags are held by related clamps. Because the packaging bags cannot be completely sealed between the opening and the side wall of the filling hopper, and the clamps can only be moderately fixed, during positive pressure filling, the material can leak from the interface between the packaging bag and the filling hopper. In addition, the vacuuming opening and closing steps and the filling valve opening and closing steps are independent of each other, which can easily lead to misoperation, causing the material to be directly sucked in by the negative pressure and directly extracted from the negative pressure suction pipe, resulting in contamination of the negative pressure mechanism and the negative pressure chamber. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the technical problems in the prior art and provide a double-layer filling hopper for a fine powder negative pressure packaging machine.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A double-layer filling hopper for a fine powder negative pressure packaging machine includes:

[0006] The inner hopper has a tapered front end and a feed valve at the end for connecting to the feed pipeline.

[0007] The outer hopper is fitted onto the outer wall of the inner hopper. The two ends of the outer hopper are sealed and fixed to the wall of the inner hopper. A negative pressure gap is provided between the inner hopper and the outer hopper. A negative pressure connecting pipe is connected to the end side wall of the inner hopper.

[0008] The pushing assembly includes a piston mechanism disposed in the inner hopper, the piston housing of the piston mechanism being fixed to the inner wall of the inner hopper by a plurality of first connecting rods, and the end of the piston housing of the piston mechanism being connected to the negative pressure gap through an intermediate tube.

[0009] Among them, a negative pressure hole for communicating with the negative pressure gap is provided on the front side wall of the inner hopper, and the negative pressure holes are arranged in a ring array along the axis of the inner hopper.

[0010] Among them, a valve ring is provided at the front end of the piston rod of the piston mechanism; the valve ring is connected to the piston rod through several second connecting rods; the valve ring has a frustum structure, and a sealing part is provided on the outside of the valve ring for contacting the inner bucket wall surface at the location of the negative pressure hole;

[0011] Among them, a material-stopping protrusion is provided on the piston rod of the piston mechanism.

[0012] As a further improvement of this utility model, a number of adsorption holes are arrayed on the front side wall of the outer hopper, and the adsorption holes are connected to the negative pressure gap.

[0013] The adsorption holes enable adsorption and fixation at the edge of the packaging bag opening, improving the fixation strength.

[0014] As a further improvement of this utility model, the adsorption hole is a long strip structure arranged along the axis of the outer bucket, and a rubber fixing sleeve is provided on the surface of the outer bucket. Several through holes communicating with the adsorption hole are arranged in an array on the fixing sleeve.

[0015] The rubber retaining sleeve not only has good surface friction, which can reduce the possibility of the packaging bag falling off, but also can further improve the sealing effect through its own elasticity.

[0016] As a further improvement of this utility model, a connecting sleeve is fitted onto the piston rod, and the material-stopping protrusion includes a plurality of material-stopping rods perpendicular to the piston rod axis and disposed on the side wall of the connecting sleeve.

[0017] The material stop bar has a larger span and a longer lever arm, which can improve the sensitivity of material sensing.

[0018] As a further improvement of this utility model, the stop rod is made of elastic material, and the end of the stop rod is embedded in the connecting sleeve; the stop rod made of elastic material will not break due to the impact of material, thus improving its service life.

[0019] As a further improvement of this utility model, an annular flange ring is provided on the end side wall of the inner hopper, and the end of the outer hopper is fixed to the inner hopper through the flange ring; a sealing ring extending towards the inner hopper is provided at the front end of the outer hopper, the sealing ring is integrally welded to the outer hopper, and the space between the sealing ring and the outer wall surface of the inner hopper is filled with sealant; the sealing structure of the sealant and the flange is easy to disassemble and install.

[0020] As a further improvement of this utility model, the intermediate tube is fixed to the first connecting rod, and a nylon protective sleeve is fitted on the outside of the intermediate tube; the intermediate tube is fixed by the first connecting rod, which reduces the damage that may be caused by material impact, and the nylon protective sleeve reduces the wear caused by material jamming on the intermediate tube.

[0021] The beneficial effects of this utility model are:

[0022] This invention achieves the switching between the packaging bag evacuation and material release processes by designing a negative pressure driven push component. It realizes efficient negative pressure fixation of the packaging bag during the negative pressure process. At the same time, during positive pressure filling, the negative pressure pipeline of the material bag can be shut off to prevent the material from being sucked into the negative pressure pipeline and affecting the cleanliness. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a cross-sectional schematic diagram of the present invention;

[0025] Figure 2 It is a combination structure of a stop bar and a connecting sleeve;

[0026] Figure 3 This is a schematic diagram of the valve ring structure.

[0027] In the diagram: 1. Inner hopper; 2. Flange ring; 3. Connecting ring; 4. Discharge port; 5. Negative pressure hole; 6. Outer hopper; 7. Adsorption hole; 8. Fixing sleeve; 9. Through hole; 10. Negative pressure connecting pipe; 11. Sealing ring; 12. Sealant; 13. Negative pressure gap; 14. Top fixing ring; 15. First connecting rod; 16. Inner fixing ring; 17. Piston housing; 18. Tail cap; 19. Intermediate pipe; 20. Protective sleeve; 21. Connecting sleeve; 22. Material stop rod; 23. Bottom fixing ring; 24. Second connecting rod; 25. Valve ring; 26. Piston rod. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0029] like Figure 1 A double-layer filling hopper for a fine powder negative pressure packaging machine, the main body of which includes an inner hopper 1 and an outer hopper 6, wherein,

[0030] The inner hopper 1 has a tapered front end with a discharge port 4 at the end. The inner hopper 1 also has a connecting ring 3 at its end, which is used to connect to the feed valve of the feed pipeline. The outer hopper 6 is fitted onto the outer wall of the inner hopper 1, and both ends of the outer hopper 6 are sealed and fixed to the wall of the inner hopper 1. A negative pressure gap 13 is provided between the inner hopper 1 and the outer hopper 6. A negative pressure connecting pipe 10 is connected to the end side wall of the inner hopper 1. An annular flange ring 2 is provided on the end side wall of the inner hopper 1, and the end of the outer hopper 6 is fixed to the inner hopper 1 through the flange ring 2. A sealing ring 11 extending toward the inner hopper 1 is provided at the front end of the outer hopper 6. The sealing ring 11 is integrally welded to the outer hopper 6, and sealant 12 is filled between the sealing ring 11 and the outer wall of the inner hopper 1.

[0031] like Figure 1It also includes a pushing component, which includes a piston mechanism disposed in the inner hopper 1. An inner fixing ring 16 is fitted and fixed on the piston shell 17 of the piston mechanism. Several first connecting rods 15 are arranged in a ring array on the inner fixing ring 16. A top fixing ring 14 is fixed to the inner wall of the end of the inner hopper 1 through the first connecting rods 15. A tail cap 18 is fixed to the end of the piston shell 17 of the piston mechanism. A middle tube 19 is connected to the tail cap 18. One end of the middle tube 19 penetrates the wall of the inner hopper 1 and connects to the negative pressure gap 13. The middle tube 19 is fixed to the first connecting rod 15. A nylon protective sleeve 20 is fitted on the outside of the middle tube 19.

[0032] Among them, a negative pressure hole 5 for communicating with the negative pressure gap 13 is provided on the front side wall of the inner hopper 1, and the negative pressure holes 5 are arranged in a circular array along the axis of the inner hopper 1; for example Figure 3 A bottom fixing ring 23 is provided at the front end of the piston rod 26 of the piston mechanism. The bottom fixing ring 23 is connected to a valve ring 25 through a number of second connecting rods 24 arranged in a ring array. The valve ring 25 has a frustum structure and a sealing part is provided on the outside of the valve ring 25 for contacting the inner wall of the hopper 1 where the negative pressure hole 5 is located.

[0033] like Figure 2 A connecting sleeve 21 is fitted onto the piston rod 26. The stop protrusion includes several stop rods 22 perpendicular to the axis of the piston rod 26, which are provided on the side wall of the connecting sleeve 21. The stop rods 22 are made of nylon material, and the ends of the stop rods 22 are embedded in the connecting sleeve 21.

[0034] like Figure 1 A number of elongated adsorption holes 7 are arranged in an array on the front side wall of the outer bucket 6. The adsorption holes 7 are connected to the negative pressure gap 13. A rubber fixing sleeve 8 is provided on the surface of the outer bucket 6. A number of through holes 9 connected to the adsorption holes 7 are arranged in an array on the fixing sleeve 8.

[0035] In use, under default conditions, valve ring 25 contacts the inner wall of inner hopper 1 under gravity, sealing the negative pressure hole 5 on the inner wall of inner hopper 1, while the feed valve for powder materials is closed. Then, a packaging bag is fitted onto the fixing sleeve 8 on the outer wall of outer hopper 6, and the negative pressure chamber is closed. Negative pressure is generated in the negative pressure gap 13 through negative pressure connecting pipe 10. This negative pressure attracts the packaging bag through adsorption hole 7 and through hole 9, causing the sidewall of the packaging bag to be attracted to the outer wall of outer hopper 6, achieving a seal. Further increasing the negative pressure causes piston rod 26 to move upwards under the drive of the negative pressure. At this point, negative pressure hole 5 opens, creating a vacuum inside the material bag. When the specified vacuum pressure is reached... When the material is in the process of being filled, the feed valve is opened and the negative pressure pipeline is closed. Driven by atmospheric pressure, the material moves towards the discharge port 4 of the inner hopper 1. While moving, the material drives the piston rod 26 downward through the baffle rod 22, causing the valve ring 25 to close the negative pressure hole 5, allowing the material to directly enter the bag. Because of the valve ring 25, a large amount of granular material will not enter the negative pressure gap 13 from the negative pressure hole 5. After filling, the feed valve is closed, and positive pressure is input into the negative pressure connecting pipe 10, causing the powder located at the edge of the packaging bag to separate from the edge of the packaging bag opening under the blowing of the positive pressure, thus ensuring the cleanliness of the packaging bag opening and preventing adverse effects on the subsequent heat sealing of the packaging bag.

[0036] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A double-layer filling hopper for a fine powder negative pressure packaging machine, characterized in that, include: The inner hopper (1) has a tapered front end and the end of the inner hopper (1) is used to connect the feed valve of the feed pipeline. The outer hopper (6) is fitted onto the outer wall of the inner hopper (1). The two ends of the outer hopper (6) are sealed and fixed to the wall of the inner hopper (1). A negative pressure gap (13) is provided between the inner hopper (1) and the outer hopper (6). A negative pressure connecting pipe (10) is connected to the end side wall of the inner hopper (1). And, a pushing assembly, the pushing assembly including a piston mechanism disposed in the inner hopper (1), the piston housing (17) of the piston mechanism being fixed to the inner wall of the inner hopper (1) by a plurality of first connecting rods (15), the end of the piston housing (17) of the piston mechanism being connected to the negative pressure gap (13) through an intermediate tube (19). Among them, a negative pressure hole (5) for communicating with the negative pressure gap (13) is provided on the front side wall of the inner hopper (1), and the negative pressure hole (5) is arranged in a ring array along the axis of the inner hopper (1). Among them, a valve ring (25) is provided at the front end of the piston rod (26) of the piston mechanism; the valve ring (25) is connected to the piston rod (26) through several second connecting rods (24); the valve ring (25) is a frustum structure, and a sealing part is provided on the outside of the valve ring (25) for contacting the wall of the inner bucket (1) where the negative pressure hole (5) is located; Among them, a material-stopping protrusion is provided on the piston rod (26) of the piston mechanism.

2. The double-layer filling hopper of a fine powder negative pressure packaging machine as described in claim 1, characterized in that: A number of adsorption holes (7) are arranged on the front side wall of the outer bucket (6), and the adsorption holes (7) are connected to the negative pressure gap (13).

3. The double-layer filling hopper of a fine powder negative pressure packaging machine as described in claim 2, characterized in that: The adsorption hole (7) is a long strip structure arranged along the axis of the outer bucket (6). A rubber fixing sleeve (8) is provided on the surface of the outer bucket (6). Several through holes (9) communicating with the adsorption hole (7) are arranged in an array on the fixing sleeve (8).

4. The double-layer filling hopper of a fine powder negative pressure packaging machine as described in claim 1, characterized in that: A connecting sleeve (21) is fitted onto the piston rod (26), and the stop protrusion includes several stop rods (22) perpendicular to the axis of the piston rod (26) and provided on the side wall of the connecting sleeve (21).

5. The double-layer filling hopper of a fine powder negative pressure packaging machine as described in claim 4, characterized in that: The stop bar (22) is made of elastic material and the end of the stop bar (22) is embedded in the connecting sleeve (21).

6. The double-layer filling hopper of a fine powder negative pressure packaging machine as described in claim 1, characterized in that: An annular flange ring (2) is provided on the end side wall of the inner hopper (1), and the end of the outer hopper (6) is fixed to the inner hopper (1) through the flange ring (2); a sealing ring (11) extending toward the inner hopper (1) is provided at the front end of the outer hopper (6), the sealing ring (11) and the outer hopper (6) are integrally welded, and sealant (12) is filled between the sealing ring (11) and the outer wall surface of the inner hopper (1).

7. The double-layer filling hopper of a fine powder negative pressure packaging machine as described in claim 1, characterized in that: The intermediate tube (19) is fixed to the first connecting rod (15), and a protective sleeve (20) made of nylon is fitted on the outside of the intermediate tube (19).

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