Linkage bag sealing mechanism of fine powder negative pressure packaging machine

Abstract

The utility model relates to a linkage bag sealing mechanism of a fine powder negative pressure packaging machine. The linkage bag sealing mechanism comprises an outer frame, a feeding port and a bag inlet, wherein the feeding port and the bag inlet are connected to the top of a negative pressure cabin. The packaging bag connecting mechanism is composed of a material guiding pipe fixed to the top of the outer frame and a V-shaped guiding frame, and a material discharging opening is formed in the guiding frame. The packaging bag fixing mechanism is composed of two sets of negative pressure pushing pistons, and piston cylinders are rotationally connected with the inner wall of the outer frame and connected with the negative pressure cabin through control valves and exhaust valves. The piston push rod is fixed to the piston block, the end of the push rod is connected with a packaging bag clamping frame, and a push block is arranged at the front end of the clamping frame and used for pressing a packaging bag. The pusher is arranged between the bottom of the outer frame and the front end of the outer wall of the piston barrel, and the pushing direction faces the packaging bag connecting mechanism.

Description

Technical Field

[0001] This utility model relates to a linkage sealing mechanism for a negative pressure packaging machine for fine powders, belonging to the field of packaging equipment. Background Technology

[0002] Negative pressure packaging machines use negative pressure to create a vacuum in the packaging bag and use atmospheric pressure to blow the material into the bag. Because atmospheric pressure is high, the packaging bag can easily come out when the material is filled at too high a rate. Negative pressure packaging machines are mainly used for packaging fine powders. For packaging bags with strong fixing brackets, the powder can easily overflow from the packaging bag and disperse into the air when the packaging bag is removed, which can also affect the working environment. 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 linkage sealing mechanism 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 linked sealing mechanism for a negative pressure packaging machine for fine powder includes:

[0006] The outer frame is connected to the top wall of the negative pressure chamber of the negative pressure packaging machine; the top of the outer frame is provided with a feed inlet and the bottom of the outer frame is provided with a bag inlet.

[0007] The packaging bag connecting mechanism includes a rectangular guide tube fixed to the top of the outer frame at the position corresponding to the inlet. The outer wall of the guide tube is used to contact the packaging bag. A V-shaped guide frame is fixed at the end of the guide tube, and several discharge openings are arranged in an array on the guide frame.

[0008] The packaging bag fixing mechanism includes two sets of negative pressure pushing pistons fixed to the inner wall of the outer frame. The two sets of negative pressure pushing pistons are arranged in a mirror image. The piston cylinder of the negative pressure pushing piston is rotatably connected to the inner wall of the outer frame. The end of the piston cylinder of the negative pressure pushing piston is connected to the outside of the negative pressure chamber through an air inlet duct. A control valve connected to the air inlet duct is provided on the outside of the negative pressure chamber. An exhaust valve communicating with the inside of the negative pressure chamber is provided at the front end of the piston cylinder of the negative pressure pushing piston. A piston push rod is vertically fixed on the piston block of the negative pressure pushing piston. The push rod is slidably and sealingly connected to the front end of the piston cylinder. A packaging bag clamping frame is fixed to the end of the piston push rod. Two sets of pushing blocks that press the packaging bag onto the guide frame are movably connected to the front end of the packaging bag clamping frame.

[0009] Among them, a pusher is set between the bottom of the outer frame and the front end of the outer wall of the piston cylinder of the negative pressure push piston, with the pushing direction facing the packaging bag connection mechanism.

[0010] As a further improvement of this utility model, the packaging bag clamping frame includes a support block fixed to the end of the piston push rod, and two sets of swing rods are rotatably connected to the support block through a spring hinge. The push block has a cylindrical structure and is fixedly connected to the end of the swing rod.

[0011] The swinging clamping mechanism achieves close contact with the surface of the packaging bag through a spring hinge, which secures the packaging bag. At the same time, when the packaging bag is removed, the swinging of the clamping mechanism can still maintain the sealing and clamping of the bag opening.

[0012] As a further improvement of this utility model, a heating block is fixedly connected to the front end of the support block by a support column. The heating block is arranged coaxially with the push block. Several protruding teeth are arranged in an array on the heating block. A first wire seat is provided on the support block. A second wire seat is provided on the top of the outer frame. A wire for supplying power to the heating block is connected between the first wire seat and the second wire seat.

[0013] The heating block can pre-fix the opening of the packaging bag after filling and when the bag is removed, reducing the possibility of leakage of fine powder.

[0014] As a further improvement of this utility model, the pusher includes a spring rod, the spring rod includes an arc-shaped elastic support part, one end of the spring rod is embedded in the bottom of the outer frame, and the other end of the spring rod is embedded in the connecting block of the piston cylinder side wall;

[0015] Compared to the piston rod, the spring rod's elastic support means it is not subject to additional negative pressure.

[0016] As a further improvement of this utility model, a push frame is provided inside the outer frame. The push frame includes two sets of sliding columns located on both sides of the bottom position of the outer frame, and a limit block is provided on the top of the sliding column. The push frame also includes a floating plate, which is slidably connected to the sliding column. A support spring is sleeved on the sliding column, and the support spring is located between the floating plate and the bottom position of the outer frame. A swing opening is provided in the middle of the floating plate, and the end of the piston cylinder is rotatably connected to the swing opening. The push frame structure can prevent the packaging bag from being damaged due to excessive squeezing force of the push block when the negative pressure is too large.

[0017] As a further improvement of this utility model, a transition cover is fixed to the front end of the piston cylinder by a flange, an air guide chamber is provided inside the transition cover, and an exhaust valve is connected to the side wall of the transition cover.

[0018] The air guide chamber enables the reversal of the exhaust valve's direction, preventing the exhaust valve from directly blowing onto the packaging bag and causing secondary dust generation.

[0019] The beneficial effects of this utility model are:

[0020] This invention utilizes two sets of piston structures driven by negative pressure. During the process of fixing and vacuuming the packaging bag, the negative pressure of the pistons presses the edges of the packaging bag to secure it. Simultaneously, after filling, the downward pull of the packaging bag synchronously drives the clamping mechanism, ensuring that the top opening of the packaging bag remains clamped, thus sealing the packaging bag and preventing material leakage. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a cross-sectional schematic diagram of the present invention;

[0023] Figure 2 This is a diagram showing the fixed state of the packaging bag;

[0024] Figure 3 This is a schematic diagram of the fixed state of the packaging bag after filling.

[0025] In the diagram: 1. Outer frame; 2. Main flange ring; 3. Bottom support plate; 4. Top support plate; 5. Feed connection pipe; 6. Guide pipe; 7. Guide frame; 8. Piston cylinder; 9. Rotary connection seat; 10. Piston block; 11. Piston cover plate; 12. Adapter cover; 13. Exhaust valve; 14. Support block; 15. Swing rod; 16. Support column; 17. Heating block; 18. Sliding column; 19. Support spring; 20. Floating plate; 21. Limiting block; 22. Swing opening; 23. Connecting block; 24. Spring rod; 25. Air inlet duct; 26. Wire; 27. Control valve. Detailed Implementation

[0026] 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.

[0027] like Figure 1 A linkage sealing mechanism for a fine powder negative pressure packaging machine, comprising:

[0028] Outer frame 1, such as Figure 1 An annular main flange ring 2 is provided on the side wall of the outer frame 1. The outer frame 1 is fixed to the top wall of the negative pressure chamber of the negative pressure packaging machine through the main flange ring 2. A feed connection pipe 5 is fixedly connected to the top of the outer frame 1 through the top support plate 4. The feed connection pipe 5 is connected to the feed hopper through the feed valve. A bottom support plate 3 is provided at the bottom of the outer frame 1. A bag inlet for inserting packaging bags is provided in the middle of the bottom support plate 3.

[0029] Packaging bag connecting mechanism, such as Figure 1The packaging bag connecting mechanism includes a rectangular guide tube 6 fixed to the top of the outer frame 1 at the position corresponding to the inlet. The outer side wall of the guide tube 6 is used to contact the packaging bag. A V-shaped guide frame 7 is fixed at the end of the guide tube 6. Several discharge openings are arranged in an array on the guide frame 7.

[0030] Packaging bag securing mechanism, such as Figure 1 The packaging bag fixing mechanism includes two sets of negative pressure push pistons fixed to the inner wall of the outer frame 1. The two sets of negative pressure push pistons are arranged in a mirror image. The piston cylinder 8 of the negative pressure push piston is provided with a rotating connecting seat 9 at its end. The rotating connecting seat 9 is rotatably connected to the push frame on the inner wall of the outer frame 1. The end of the piston cylinder 8 of the negative pressure push piston is connected to the outside of the negative pressure chamber through an air inlet duct 25. A control valve 27 connected to the air inlet duct 25 is provided on the outside of the negative pressure chamber. A piston cover plate 11 is provided at the front end of the piston cylinder 8 of the negative pressure push piston. A transition cover is connected to the piston cover plate 11 through a flange. 12. An air guide chamber is provided inside the adapter housing 12. An exhaust valve 13 is connected to the side wall of the adapter housing 12 and communicates with the interior of the negative pressure chamber. A piston push rod is vertically fixed on the piston block 10 of the negative pressure piston. The push rod is slidably and sealed to the front end of the piston cylinder 8. A packaging bag holder is fixed at the end of the piston push rod. The packaging bag holder includes a support block 14 fixed to the end of the piston push rod. Two sets of swing rods 15 are rotatably connected to the support block 14 through a spring hinge. Two sets of cylindrical push blocks are rotatably connected to the ends of the swing rods 15.

[0031] Among them, such as Figure 1 A heating block 17 is fixedly connected to the front end of the support block 14 via a support column 16. The heating block 17 is arranged coaxially with the push block. Several protruding teeth are arranged in an array on the heating block 17. A first wire seat is provided on the support block 14, and a second wire seat is provided on the top of the outer frame 1. A wire 26 for supplying power to the heating block 17 is connected between the first wire seat and the second wire seat.

[0032] Among them, such as Figure 1 A spring rod 24 with a pushing direction toward the packaging bag connecting mechanism is provided between the bottom of the outer frame 1 and the front end of the outer wall of the piston cylinder 8 that pushes the piston under negative pressure. The spring rod 24 includes an arc-shaped elastic support part. One end of the spring rod 24 is embedded in the bottom of the outer frame 1, and the other end of the spring rod 24 is embedded in the connecting block 23 on the side wall of the piston cylinder 8.

[0033] Among them, such as Figure 1The push frame includes two sets of sliding columns 18 located on both sides of the bottom position of the outer frame 1, and a limit block 21 is provided on the top of the sliding column 18; the push frame also includes a floating plate 20, which is slidably connected to the sliding column 18, and a support spring 19 is sleeved on the sliding column 18, which is located between the floating plate 20 and the bottom position of the outer frame 1; a swing opening 22 is provided in the middle of the floating plate 20, and the rotating connecting seat 9 at the end of the piston cylinder 8 is rotatably connected to the swing opening 22.

[0034] When using, such as Figure 2 and Figure 3 First, the packaging bag is attached to the feed tube 6 via the guide frame 7. The packaging bag is secured to the feed tube 6 by its own elasticity. Then, the negative pressure chamber is evacuated. During the evacuation process, air inside the piston cylinder 8 is discharged through the exhaust valve 13, causing the piston block 10 to push the piston rod out. During this extension, the swing rod 15 on the support block 14 presses the push block against the top surface of the packaging bag, completing the pre-fixation of the packaging bag. Simultaneously, the piston cylinder 8 pushes the floating plate 20 down, and the elastic force of the support spring 19 provides additional elastic support to the piston cylinder 8, ensuring the fixation of the packaging bag. Then, the control valve 27 is closed; subsequently... Figure 3 Open the feed valve and blow the powder into the packaging bag using atmospheric pressure, causing the packaging bag to expand and complete the filling. After filling, close the feed valve and open the negative pressure chamber to pull the packaging bag downwards, causing the top of the packaging bag to detach from the guide frame 7 and the top opening of the packaging bag to be clamped between two sets of heating blocks 17. The heating of the heating blocks 17 achieves local thermal bonding and fixation of the packaging bag. Then, open the control valve 27, remove the packaging bag, and complete the filling.

[0035] 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 linkage sealing mechanism for a negative pressure packaging machine for fine powders, characterized in that, include: The outer frame (1) is connected to the top wall of the negative pressure chamber of the negative pressure packaging machine; the top of the outer frame (1) is provided with a feed inlet and the bottom of the outer frame (1) is provided with a bag inlet. The packaging bag connecting mechanism includes a rectangular guide tube (6) fixed to the top of the outer frame (1) at the position corresponding to the inlet. The outer side wall of the guide tube (6) is used to contact the packaging bag. A V-shaped guide frame (7) is fixed at the end of the guide tube (6). Several discharge openings are arranged in an array on the guide frame (7). The packaging bag fixing mechanism includes two sets of negative pressure push pistons fixed to the inner wall of the outer frame (1). The two sets of negative pressure push pistons are arranged in a mirror image. The piston cylinder (8) of the negative pressure push piston is rotatably connected to the inner wall of the outer frame (1). The end of the piston cylinder (8) of the negative pressure push piston is connected to the outside of the negative pressure chamber through the air inlet pipe (25). A control valve (27) connected to the air inlet pipe (25) is provided on the outside of the negative pressure chamber. An exhaust valve (13) communicating with the inside of the negative pressure chamber is provided at the front end of the piston cylinder (8) of the negative pressure push piston. A piston push rod is vertically fixed on the piston block (10) of the negative pressure push piston. The push rod is slidably sealed to the front end of the piston cylinder (8). A packaging bag clamping frame is fixed at the end of the piston push rod. Two sets of push blocks that press the packaging bag onto the guide frame (7) are movably connected to the front end of the packaging bag clamping frame. Among them, a pusher with a pushing direction toward the packaging bag connecting mechanism is provided between the bottom of the outer frame (1) and the front end of the outer wall of the piston cylinder (8) of the negative pressure pushing piston.

2. The linkage sealing mechanism of a fine powder negative pressure packaging machine as described in claim 1, characterized in that: The packaging bag holder includes a support block (14) fixed to the end of the piston rod. Two sets of swing rods (15) are rotatably connected to the support block (14) via spring hinges. The push block is a cylindrical structure and is fixedly connected to the end of the swing rod (15).

3. The linkage sealing mechanism of a fine powder negative pressure packaging machine as described in claim 2, characterized in that: A heating block (17) is fixedly connected to the front end of the support block (14) via a support column (16). The heating block (17) is arranged coaxially with the push block. Several protruding teeth are arranged in an array on the heating block (17). A first wire seat is provided on the support block (14), and a second wire seat is provided on the top of the outer frame (1). A wire (26) for supplying power to the heating block (17) is connected between the first wire seat and the second wire seat.

4. The linkage sealing mechanism of a fine powder negative pressure packaging machine as described in claim 1, characterized in that: The pusher includes a spring rod (24), which includes an arc-shaped elastic support. One end of the spring rod (24) is embedded in the bottom of the outer frame (1), and the other end of the spring rod (24) is embedded in the connecting block (23) on the side wall of the piston cylinder (8).

5. The linkage sealing mechanism of a fine powder negative pressure packaging machine as described in claim 1, characterized in that: A pusher frame is provided inside the outer frame (1). The pusher frame includes two sets of sliding columns (18) located on both sides of the bottom position of the outer frame (1). A limit block (21) is provided on the top of the sliding column (18). The pusher frame also includes a floating plate (20). The floating plate (20) is slidably connected to the sliding column (18). A support spring (19) is sleeved on the sliding column (18). The support spring (19) is located between the floating plate (20) and the bottom position of the outer frame (1). A swing opening (22) is provided in the middle of the floating plate (20). The end of the piston cylinder (8) is rotatably connected to the swing opening (22).

6. The linkage sealing mechanism of a fine powder negative pressure packaging machine as described in claim 1, characterized in that: A transition cover (12) is fixed to the front end of the piston cylinder (8) by a flange. An air guide chamber is provided inside the transition cover (12), and an exhaust valve (13) is connected to the side wall of the transition cover (12).

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