Plastic packaging bag stretching forming equipment

Abstract

The invention discloses plastic packaging bag stretch forming equipment, and relates to the technical field of film blowing machines, the plastic packaging bag stretch forming equipment comprises a screw extruder, the bottom of the screw extruder is fixedly connected with a plurality of supports, one side of the screw extruder is fixedly connected with a first driving device, and the other side of the screw extruder is fixedly connected with a blow-out die head. According to the screw extruder, materials passing through the pretreatment mechanism are subjected to particle size separation through the screening mechanism, then the separated materials with different particle sizes are guided into the screw extruder through the feeding sleeves at different positions, and the materials with the large particle size are guided into the feeding sleeve at the rear position; materials with small particle sizes are guided into the feeding sleeve at the front position, the forward pushing time of the materials entering from different positions in the screw extruder is different, the pushing time of the materials with large particle sizes is long, the melting heating time is long, the pushing time of the materials with small particle sizes is short, and the melting heating time is relatively long. And material particles with different sizes can be completely fused conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of film blowing machines, in particular to stretching and forming equipment for plastic packaging bags. Background Art

[0002] The film blowing machine is mainly composed of an extruder, a die head, a cooling device, a bubble stabilizing frame, a herringbone plate, a traction roller, a winding device, etc. Add dry plastic particles into the lower hopper, and the particles enter the extruder from the hopper by their own weight. When the particles come into contact with the threaded bevel in the extruder, the rotating bevel surface generates a thrust perpendicular to the bevel surface on the plastic, pushing the plastic particles forward. During the pushing process, the plastic gradually melts due to the friction between the plastic and the screw, the plastic and the barrel, the collision and friction between the particles, and the external heating of the barrel. The molten plastic is filtered by the die head to remove impurities and comes out from the die mouth. It is cooled by the air ring, blown up by the herringbone plate, traction roller, and winding to roll the finished film into a tube.

[0003] At present, plastic granules are often produced by wet granulators or dry granulators, but due to factors such as the rotation speed of the granulator and the uniformity of raw material mixing, the particle size distribution of the raw material particles produced is uneven. When the plastic raw material particles enter the extruder, they will be heated and melted while being pushed forward. The melting speed of some plastic particles with larger particle sizes is inconsistent with that of particles with smaller particle sizes. Particles with larger particle sizes may not be completely melted, resulting in accumulation and blockage, which leads to unstable quality of subsequent film blowing. At present, the melting of particles can be accelerated by increasing the melting temperature, but some raw materials may be denatured or undergo other chemical reactions due to high temperature, resulting in changes in material properties. Therefore, this application proposes a plastic packaging bag stretching forming device to solve the above problems. Summary of the invention

[0004] The present invention provides a plastic packaging bag stretching and forming device to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: The plastic packaging bag stretching forming equipment comprises a screw extruder, a plurality of brackets are fixedly connected to the bottom of the screw extruder, a driving device is fixedly connected to one side of the screw extruder, a blowing die is fixedly connected to the other side of the screw extruder, a feed hopper is arranged on the top of the screw extruder, a pre-separation box is fixedly connected to the bottom of the feed hopper, and a pre-treatment mechanism for pre-separating plastic particles is installed on the pre-separation box.

[0006] A plurality of feed sleeves are fixedly connected to the upper surface of the screw extruder, each of which is movably connected to a solenoid valve, a screening mechanism for separating plastic particles is provided between the feed sleeve and the bottom of the pre-separation box, and the output end of the screening mechanism is movably connected to the feed sleeves at different positions.

[0007] A further improvement of the technical solution of the present invention is that the pretreatment mechanism includes an air inlet pipe fixedly connected to one side of the pre-separation box, an outer filter plate is movably connected to the outer side of the air inlet pipe, an inlet fan is fixedly connected to the inner wall of the air inlet pipe, and two diversion sleeves are fixedly connected to the bottom of the pre-separation box.

[0008] A further improvement of the technical solution of the present invention is that: the screening mechanism comprises an inner box 1 and an inner box 2 which are respectively movably connected to the bottoms of the two diverter sleeves, the inner box 1 and the inner box 2 cover the output end of the diverter sleeve, the outer surface of the inner box 1 is fixedly connected to the outer box 1 through a connecting piece 1, and the outer surface of the inner box 2 is fixedly connected to the outer box 2 through a connecting piece 2, a coarse filter plate is fixedly connected to the inner wall of the inner box 1, and a fine filter plate is fixedly connected to the inner wall of the inner box 2, the mesh pores of the coarse filter plate are larger than the mesh pores of the fine filter plate, The coarse filter plate, fine filter plate, outer shell box one and outer shell box two all have a certain inclination, the lower end of the outer shell box one is fixedly connected to the inner shell box two, the lower surfaces of the inner shell box one and the inner shell box two are provided with discharge ports, the outer surfaces of the inner shell box one and the inner shell box two are fixedly connected with export boxes, the export boxes cover the discharge ports, the bottoms of the outer shell box two and the export boxes are fixedly connected with export pipes, one end of the export pipes is movably connected to the feed sleeve, and the outer shell box one and the outer shell box two are provided with support components on their exteriors.

[0009] A further improvement of the technical solution of the present invention is that the support assembly includes a plurality of support frames fixedly connected to the bottom of outer shell box one and outer shell box two, one end of each of the support frames is fixedly connected to a spring, and one end of each of the springs is fixedly connected to the upper surface of the screw extruder.

[0010] A further improvement of the technical solution of the present invention is that: the sides of the outer shell box 1 and the outer shell box 2 are fixedly connected with a connecting rod, one end of the connecting rod is movably connected with a short rod, one end of the short rod is fixedly connected with a driving device 2, and the outer surface of the driving device 2 is fixedly connected to the side of the screw extruder through a mounting frame.

[0011] A further improvement of the technical solution of the present invention is that an arc-shaped stopper is fixedly connected between the bottom of the inner cavity of the pre-separation box and the opening of the diverter sleeve.

[0012] A further improvement of the technical solution of the present invention is that a heating plate is fixedly connected to the inner wall of the air inlet duct on one side of the air inlet fan.

[0013] A further improvement of the technical solution of the present invention is that an inner baffle is fixedly connected to the inner wall of the air inlet pipe on the side close to the pre-separation box.

[0014] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art: 1. The present invention provides a stretching and forming device for a plastic packaging bag. The material after the pretreatment mechanism is separated by a screening mechanism according to its particle size. The separated materials of different particle sizes are then introduced into the interior of a screw extruder through feed sleeves at different positions, wherein the material with a larger particle size is introduced into the feed sleeve at a rear position, and the material with a smaller particle size is introduced into the feed sleeve at a front position. The materials entering at different positions are pushed forward at different times in the screw extruder. The material with a large particle size has a long pushing time and a long melting and heating time, while the material with a small particle size has a short pushing time and a relatively long melting and heating time, so that the material particles of different sizes can be completely melted, and the material accumulation and blockage are avoided, resulting in the problem of unstable quality of subsequent film blowing.

[0015] 2. The present invention provides a stretching and forming device for plastic packaging bags. When the wind generated by the inlet fan blows through the heating plate, it exchanges heat with the heating plate, so that the blowing temperature increases. When the wind pre-separates the falling materials, it exchanges heat with the materials, so that the materials are preheated, thereby shortening the melting time in the screw extruder.

[0016] 3. The present invention provides a plastic packaging bag stretching and forming device, which can drive the short rod to rotate through the second driving device, driving the connecting rod to pull the screening mechanism to shake within a certain range, thereby promoting the separation and export of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the screening mechanism of the present invention; Figure 3 It is a schematic cross-sectional structure diagram of the export box of the present invention; Figure 4 It is a cross-sectional structural schematic diagram of the pretreatment mechanism of the present invention; Figure 5 It is a schematic diagram of the structure of the inner box 1 and the inner box 2 of the present invention; Figure 6 For the present invention Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0018] In the figure: 1. screw extruder; 2. driving device 1; 3. bracket; 4. blowing die; 5. feeding sleeve; 6. feeding hopper; 7. pre-separation box; 8. air inlet pipe; 9. outer filter plate; 10. air inlet fan; 11. heating plate; 12. inner baffle; 13. diverter sleeve; 14. arc stopper; 15. inner box 1; 16. connecting piece 1; 17. outer box 1; 18. inner box 2; 19. outer box 2; 20. connecting piece 2; 21. coarse filter plate; 22. fine filter plate; 23. discharge port; 24. lead-out box; 25. lead-out pipe; 26. connecting rod; 27. short rod; 28. driving device 2; 29. ​​mounting frame; 30. support frame; 31. spring. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with embodiments: Example 1

[0020] like Figure 1-6 As shown, the present invention provides a plastic packaging bag stretching forming device, including a screw extruder 1, a screw propulsion device and a heating device are installed inside the screw extruder 1, a plurality of brackets 3 are fixedly connected to the bottom of the screw extruder 1, a driving device 2 is fixedly connected to one side of the screw extruder 1, a blowing die 4 is fixedly connected to the other side of the screw extruder 1, a feed hopper 6 is arranged on the top of the screw extruder 1, a pre-separation box 7 is fixedly connected to the bottom of the feed hopper 6, a pre-treatment mechanism for pre-separating plastic particles is installed on the pre-separation box 7, and the material enters the pre-separation box 7 through the feed hopper 6 for pre-separation After treatment, it enters the screw extruder 1, and the spiral propulsion device and the heating device are driven by the driving device 2 to push the material forward while heating and melting it, and then it is ejected through the blowing die 4, and the cooling device, bubble stabilizing frame, herringbone plate, traction roller, winding device and other devices are used to stretch it. The screw extruder 1 and the spiral propulsion device and heating device installed inside it, as well as the cooling device, bubble stabilizing frame, herringbone plate, traction roller, winding device and related connecting parts used for subsequent stretching and molding are all mature technologies in the prior art, and therefore are not specifically described in this application.

[0021] A plurality of feed sleeves 5 are fixedly connected to the upper surface of the screw extruder 1, each of which is movably connected to a solenoid valve. A screening mechanism for separating plastic particles is arranged between the feed sleeve 5 and the bottom of the pre-separation box 7, and the output end of the screening mechanism is movably connected to the feed sleeves 5 at different positions. The material after the pretreatment mechanism is separated by particle size through the screening mechanism, and then the separated materials of different particle sizes are introduced into the interior of the screw extruder 1 through the feed sleeves 5 at different positions, wherein the material with larger particle size is introduced into the feed sleeve 5 at the rear position, and the material with smaller particle size is introduced into the feed sleeve 5 at the front position. The materials entering at different positions are pushed forward in the screw extruder 1 at different times, the materials with larger particle size have a long pushing time and a long melting and heating time, the materials with smaller particle size have a short pushing time and a relatively long melting and heating time, so that the material particles of different sizes can be completely melted, avoiding the accumulation and blockage of materials, resulting in the problem of unstable quality of subsequent film blowing.

[0022] Furthermore, the pretreatment mechanism includes an air inlet pipe 8 fixedly connected to one side of the pre-separation box 7, an outer filter plate 9 is movably connected to the outer side of the air inlet pipe 8, an inlet fan 10 is fixedly connected to the inner wall of the air inlet pipe 8, and two diverter sleeves 13 are fixedly connected to the bottom of the pre-separation box 7. Materials of different particle sizes are introduced through the feed hopper 6. When they flow into the pre-separation box 7, separation air is generated by the inlet fan 10. Materials with smaller particle sizes are blown to the diverter sleeves 13 at a farther position and fall down and are discharged, while materials with larger particle sizes fall down and are discharged through the diverter sleeves 13 at a closer position.

[0023] Furthermore, the screening mechanism includes an inner box 15 and an inner box 2 18 which are respectively movably connected to the bottom of the two diverter sleeves 13, the inner box 15 and the inner box 2 18 cover the output end of the diverter sleeve 13, the outer surface of the inner box 15 is fixedly connected to the outer box 17 through the connecting piece 16, the outer surface of the inner box 2 18 is fixedly connected to the outer box 2 19 through the connecting piece 20, the inner wall of the inner box 15 is fixedly connected to a coarse filter plate 21, the inner wall of the inner box 2 18 is fixedly connected to a fine filter plate 22, and the mesh pores of the coarse filter plate 21 are larger than those of the fine filter plate 2 2, the coarse filter plate 21, the fine filter plate 22, the outer casing 17 and the outer casing 19 all have a certain inclination, the lower end of the outer casing 17 is fixedly connected to the inner casing 18, the lower surfaces of the inner casing 15 and the inner casing 18 are provided with a discharge port 23, the outer surfaces of the inner casing 15 and the inner casing 18 are fixedly connected with a lead-out box 24, the lead-out box 24 covers the discharge port 23, the bottoms of the outer casing 19 and the lead-out box 24 are fixedly connected with a lead-out pipe 25, one end of the lead-out pipe 25 is connected to the feed sleeve 5 The outer outer box 17 and the outer outer box 2 19 are movably connected, and a supporting component is arranged outside. The materials with larger particle size after initial separation are led out through the diversion sleeve 13 and introduced into the inner box 15, and the materials with smaller particle size are led into the inner box 2 18. The materials after initial separation are separated again by the coarse filter plate 21 and the fine filter plate 22 arranged at the bottom of the inner box 15 and the inner box 2 18. The materials with larger particle size in the inner box 15 flow out through the discharge port 23, and are led out through the lead-out box 24 and the lead-out pipe 25. The materials with smaller particle size in the inner box 15 leak out to the coarse filter plate 2 1, are collected by the outer casing 17 and then led out to the inner casing 2 18, and are separated again together with the pre-separated materials. Since the mesh aperture of the fine filter plate 22 is smaller than that of the coarse filter plate 21, the materials with a particle size smaller than the mesh aperture of the coarse filter plate 21 and larger than the mesh aperture of the fine filter plate 22 are led out through the discharge port 23 provided on the inner casing 2 18, and are led out through the lead-out box 24 and the lead-out pipe 25. The materials with a particle size smaller than the mesh aperture of the fine filter plate 22 leak into the bottom of the fine filter plate 22, are collected by the outer casing 19 and then led out through the lead-out pipe 25.

[0024] Furthermore, the support assembly includes a plurality of support frames 30 fixedly connected to the bottom of the outer shell box 17 and the outer shell box 2 19, one end of each support frame 30 is fixedly connected to a spring 31, and one end of each spring 31 is fixedly connected to the upper surface of the screw extruder 1. Through the action of the support frame 30 and the spring 31, support is provided for the screening mechanism. At the same time, through the action of the spring 31, the entire screening mechanism can be shaken within a certain range as a whole, so that the material can be smoothly discharged.

[0025] Furthermore, a connecting rod 26 is fixedly connected to the side of the outer jacket box 17 and the outer jacket box 2 19, one end of the connecting rod 26 is movably connected to a short rod 27, one end of the short rod 27 is fixedly connected to a driving device 28, and the outer surface of the driving device 28 is fixedly connected to the side of the screw extruder 1 through a mounting frame 29. The short rod 27 can be driven to rotate by the driving device 28, driving the connecting rod 26 to pull the screening mechanism to shake within a certain range, thereby promoting the separation and export of materials.

[0026] Furthermore, an arc-shaped stopper 14 is fixedly connected between the bottom of the inner cavity of the pre-separation box 7 and the opening of the diverter sleeve 13 , and the arc-shaped stopper 14 can prevent the material from accumulating at the bottom of the inner cavity of the pre-separation box 7 .

[0027] Furthermore, a heating plate 11 is fixedly connected to the inner wall of the air inlet pipe 8 on one side of the air inlet fan 10. When the wind generated by the air inlet fan 10 blows through the heating plate 11, it exchanges heat with the heating plate 11, so that the blowing temperature increases. While the wind pre-separates the falling materials, it exchanges heat with the materials, so that the materials are preheated, thereby shortening the melting time in the screw extruder 1.

[0028] Furthermore, an inner baffle 12 is fixedly connected to the inner wall of the air inlet pipe 8 on one side close to the pre-separation box 7 to prevent falling materials from entering the air inlet pipe 8 .

[0029] Furthermore, the driving device 1 2 and the driving device 2 28 are prior art devices, and are usually motors or the like that can be used to drive the screw propulsion device and the short rod 27 to rotate.

[0030] The following is a detailed description of the working principle of the plastic packaging bag stretching forming equipment.

[0031] like Figure 1-6As shown, materials of different particle sizes are introduced through the feed hopper 6 and flow into the pre-separation box 7. Separation blowing is generated by the inlet fan 10, and materials with smaller particle sizes are blown to the diverter sleeve 13 at a farther position and fall down and are discharged. Materials with larger particle sizes fall down and are discharged through the diverter sleeve 13 at a closer position. Among them, the initially separated materials with larger particle sizes are introduced into the inner box 15, and the materials with smaller particle sizes are introduced into the inner box 2 18. The coarse filter plate 21 and the fine filter plate 22 arranged at the bottom of the inner box 15 and the inner box 2 18 are separated and processed again after the initial separation. The larger particle size materials in the inner box 15 flow out through the discharge port 23, and are discharged through the discharge box 24 and the discharge pipe 25. The smaller particle size materials in the inner box 15 leak out to the bottom of the coarse filter plate 21, are gathered by the outer jacket box 17, and are discharged to the inner box 2. 18, the materials introduced with the pre-separation are separated again, and because the mesh aperture of the fine filter plate 22 is smaller than the mesh aperture of the coarse filter plate 21, the materials with a particle size smaller than the mesh aperture of the coarse filter plate 21 and larger than the mesh aperture of the fine filter plate 22 are discharged through the discharge port 23 opened on the inner box 18, and are discharged through the discharge box 24 and the discharge pipe 25, and the materials with a particle size smaller than the mesh aperture of the fine filter plate 22 leak into the bottom of the fine filter plate 22, are gathered by the outer box 19, and are discharged through the discharge pipe 25, among which the materials with larger particle sizes are introduced into the feed sleeve 5 at the rear position through the discharge pipe 25 at the corresponding position, and the materials with smaller particle sizes are introduced into the feed sleeve 5 at the front position through the discharge pipe 25 at the corresponding position, and the materials entering at different positions are pushed forward at different times in the screw extruder 1.

Claims

1. A plastic packaging bag stretching and forming device, comprising a screw extruder (1), wherein a plurality of brackets (3) are fixedly connected to the bottom of the screw extruder (1), a driving device (2) is fixedly connected to one side of the screw extruder (1), and a blowing die (4) is fixedly connected to the other side of the screw extruder (1), characterized in that: A feed hopper (6) is arranged on the top of the screw extruder (1), a pre-separation box (7) is fixedly connected to the bottom of the feed hopper (6), and a pre-treatment mechanism for pre-separating plastic particles is installed on the pre-separation box (7); The upper surface of the screw extruder (1) is fixedly connected to a plurality of feed sleeves (5), each feed sleeve (5) is movably connected to a solenoid valve, a screening mechanism for separating plastic particles is provided between the feed sleeve (5) and the bottom of the pre-separation box (7), and the output end of the screening mechanism is movably connected to the feed sleeves (5) at different positions; the pre-treatment mechanism comprises an air inlet pipe (8) fixedly connected to one side of the pre-separation box (7), an outer filter plate (9) is movably connected to the outer side of the air inlet pipe (8), an air inlet fan (10) is fixedly connected to the inner wall of the air inlet pipe (8), and two flow dividers (13) are fixedly connected to the bottom of the pre-separation box (7); the screening mechanism comprises two flow dividers (13) movably connected to the two flow dividers ( 13) inner box one (15) and inner box two (18) at the bottom, the inner box one (15) and inner box two (18) enclose the output end of the diverter sleeve (13), the outer surface of the inner box one (15) is fixedly connected to the outer casing one (17) via a connecting piece one (16), the outer surface of the inner box two (18) is fixedly connected to the outer casing two (19) via a connecting piece two (20), the inner wall of the inner box one (15) is fixedly connected to a coarse filter plate (21), the inner wall of the inner box two (18) is fixedly connected to a fine filter plate (22), the mesh pores of the coarse filter plate (21) are larger than the mesh pores of the fine filter plate (22), the coarse filter plate (21), the fine filter plate (22), the outer casing one (17) and the outer casing two (1 9) both present a certain inclination, the lower end of the outer casing (17) is fixedly connected to the inner casing (18), the lower surfaces of the inner casing (15) and the inner casing (18) are provided with a discharge port (23), the outer surfaces of the inner casing (15) and the inner casing (18) are both fixedly connected with an export box (24), the export box (24) covers the discharge port (23), the bottom of the outer casing (19) and the export box (24) are both fixedly connected with an export pipe (25), one end of the export pipe (25) is movably connected to the feed sleeve (5), the outer casing (17) and the outer casing (19) are provided with a support assembly on the outside, and the separated materials of different particle sizes are discharged through different positions The feed sleeve is introduced into the interior of the screw extruder; the support assembly includes a plurality of support frames (30) fixedly connected to the bottom of the outer casing one (17) and the outer casing two (19), one end of each of the support frames (30) is fixedly connected to a spring (31), and one end of each of the springs (31) is fixedly connected to the upper surface of the screw extruder (1); the side surfaces of the outer casing one (17) and the outer casing two (19) are fixedly connected to a connecting rod (26), one end of the connecting rod (26) is movably connected to a short rod (27), one end of the short rod (27) is fixedly connected to a driving device two (28), and the outer surface of the driving device two (28) is fixedly connected to the side surface of the screw extruder (1) through a mounting frame (29).

2. The plastic packaging bag stretching and forming equipment according to claim 1, characterized in that: An arc-shaped stopper (14) is fixedly connected between the bottom of the inner cavity of the pre-separation box (7) and the opening of the diversion sleeve (13).

3. The plastic packaging bag stretching and forming equipment according to claim 2, characterized in that: A heating plate (11) is fixedly connected to the inner wall of the air inlet pipe (8) on one side of the air inlet fan (10).

4. The stretching and forming equipment for plastic packaging bags according to claim 3, characterized in that: An inner baffle (12) is fixedly connected to the inner wall of the air inlet pipe (8) on the side close to the pre-separation box (7).

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