Plastic bag blow molding device

Abstract

The invention discloses a plastic bag blow molding device, and belongs to the technical field of plastic bag processing. A plastic bag blow molding device comprises a frame body and further comprises a blow molding machine fixedly installed on the frame body, an extrusion head of the blow molding machine is fixedly connected with a central pipe, and a first nozzle is installed on the outer wall of the central pipe; the vertical pipe is arranged at the upper end of the extrusion head and surrounds the periphery of the central pipe, a plurality of outer pipes arranged at equal intervals are fixedly installed on the inner wall of the vertical pipe, second nozzles facing the central pipe are fixedly installed on the outer pipes, and a reciprocating part for driving the vertical pipe to rotate in a reciprocating mode is arranged on the blow molding machine; the tubular film can be cooled and shaped more uniformly, and the final quality of plastic bags is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of plastic bag processing, in particular to a plastic bag blow molding device. Background Art

[0002] Plastic bags are a common packaging material, widely used in daily life, commerce and industry. They are usually made of polyethylene (PE) materials, which are divided into low-density polyethylene (LDPE) and high-density polyethylene (HDPE), and sometimes other plastic materials such as polypropylene (PP) are used. During production and processing, a blow molding machine is needed to process the plastic film, and then the subsequent processing is completed through cutting and pressing equipment.

[0003] During the blow molding process of plastic bags, the extruder head needs to use exhaust equipment to cool down and shape the blown film. However, the position of the existing exhaust equipment is basically fixed, which makes it difficult to evenly cool down and shape some parts of the film, which in turn affects the uniformity of the film thickness and ultimately the quality of the plastic bag. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the exhaust equipment of the extruder head does not exhaust uniformly, and to propose a plastic bag blowing device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A plastic bag blow molding device comprises a frame, and also includes: a blow molding machine fixedly mounted on the frame, wherein a central tube is fixedly connected to the extrusion head of the blow molding machine, and a first nozzle is installed on the outer wall of the central tube; a vertical tube is arranged at the upper end of the extrusion head and surrounds the central tube, wherein a plurality of outer tubes arranged at equal intervals are fixedly mounted on the inner wall of the vertical tube, and a second nozzle facing the central tube is fixedly mounted on the outer tube; and the blow molding machine is provided with a reciprocating portion for driving the vertical tube to reciprocate.

[0007] In order to make the vertical tube rotate, preferably, the reciprocating part includes a driving motor fixedly mounted on the blow molding machine, and the output shaft of the driving motor is fixedly mounted with an incomplete gear, wherein the outer wall of the vertical tube is fixedly mounted with an annular gear meshing with the incomplete gear, and the extrusion head is fixedly connected with an annular seat, the lower end of the vertical tube is sleeved in the annular seat, and a lifting part is provided between the annular seat and the vertical tube, and when the vertical tube rotates, the lifting part will lift the vertical tube upward.

[0008] In order to make the vertical pipe move back and forth up and down, the lifting part further includes a slider fixedly installed on the outer wall of the lower end of the vertical pipe, the outer wall of the annular seat is provided with an inclined arc groove, and the slider is sleeved in the arc groove. When the vertical pipe rotates, the slider will slide along the arc groove.

[0009] In order to convey airflow to the outer tube and the central tube, preferably, a fan is fixedly installed on the extrusion head, the input end of the central tube is connected to the output end of the fan, and the top of the vertical tube is fixedly connected with an annular tube connected to the outer tube, and the annular tube is connected to the input end of the fan through a connecting tube.

[0010] In order to guide the tubular film, further, a plurality of longitudinally distributed circular rings are arranged in the vertical tube, the plurality of circular rings are fixedly connected by connecting rods, a plurality of guide wheels arranged at equal intervals are rotatably installed on the inner walls of the plurality of circular rings, and a linkage part for driving the circular rings to move up and down is provided in the vertical tube.

[0011] In order to make the guide wheel move up and down reciprocatingly, the linkage part further includes a vertical rod fixedly connected to the extrusion head, the circular ring is longitudinally slidably connected to the vertical rod, and the inner wall of the vertical tube is equipped with a roller through a short axis rotation, and the roller rests on the lower end of one of the circular rings.

[0012] In order to dredge the feed hopper, a dredge pipe is further provided in the feed hopper of the blow molding machine, an exhaust hole is provided on the outer wall of the dredge pipe, a trumpet-shaped cover is fixedly connected to the top of the vertical pipe, the trumpet-shaped cover is connected to the dredge pipe through a hose, and the blow molding machine is provided with a lifting part for driving the dredge pipe to move up and down.

[0013] In order to make the clearing pipe move up and down reciprocatingly, the lifting part further includes a guide rod fixedly connected to the blow molding machine, a cross bar is longitudinally slidably connected to the guide rod, the top of the guide rod is fixedly connected to a limit plate, and a spring is installed between the cross bar and the limit plate, wherein the clearing pipe is rotatably installed on the cross bar, the outer wall of the vertical pipe is fixedly connected to a ring plate, and one end of the cross bar is placed on the upper end of the ring plate.

[0014] In order to make the dredging pipe reciprocate, further, the lower end of the cross bar is rotatably connected to a transmission shaft, and the transmission shaft and the dredging pipe are connected by two mutually meshing transmission gears.

[0015] In order to make the dredging pipe reciprocate, further, a passive gear is fixedly mounted on the transmission shaft, and a rack meshingly connected with the passive gear is fixedly mounted on the blow molding machine.

[0016] Compared with the prior art, the present invention provides a plastic bag blow molding device having the following

[0017] Beneficial effects:

[0018] 1. The plastic bag blow molding device drives the incomplete gear to rotate through the driving motor, and the vertical tube drives the second nozzle to reciprocate and rise and fall through the outer tube, and reciprocate and revolve around the axis of the vertical tube, thereby significantly increasing the exhaust area of ​​the second nozzle, allowing the tubular film to be cooled and shaped more evenly, ensuring the final quality of the plastic bag.

[0019] 2. The plastic bag blow molding device can also drive the guide wheel to move up and down along the outer wall of the tubular film through the vertical pipe that reciprocates up and down, so as to prevent the tubular film from wrinkling and deforming due to uneven force at local positions, thereby further improving the final quality of the plastic bag.

[0020] 3. The plastic bag blow molding device allows part of the airflow discharged from the vertical pipe to enter the hose through the trumpet-shaped cover. The dredging pipe will blow the airflow into the feed hopper through the exhaust hole. On the one hand, the raw materials can be preheated by the residual air, and on the other hand, some odors in the air can be absorbed by the raw materials, and at the same time, the feed hopper is not prone to blockage.

[0021] 4. The plastic bag blowing device can make the dredging pipe move up and down in the feed hopper through the vertical pipe that reciprocates up and down, so that the feed hopper is not easy to be blocked. The exhaust hole used for exhaust can make the dredging effect and preheating effect better.

[0022] 5. The plastic bag blow molding device drives the passive gear to roll back and forth on the rack through the cross bar, and the transmission shaft drives the dredging pipe to rotate back and forth through two mutually meshing transmission gears, and the dredging pipe drives the exhaust hole to swing back and forth, which significantly improves the dredging effect on the feed hopper and the preheating effect on the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the axonometric structure of a plastic bag blow molding device proposed by the present invention from a first perspective;

[0024] Figure 2 This is a schematic diagram of the axonometric structure of a plastic bag blow molding device proposed by the present invention from a second viewing angle;

[0025] Figure 3 This is a partial isometric structural schematic diagram of a plastic bag blow molding device proposed by the present invention;

[0026] Figure 4 This is a schematic diagram of the isometric structure of a vertical tube of a plastic bag blow molding device proposed by the present invention;

[0027] Figure 5 This is a schematic diagram of the cross-sectional structure of a vertical pipe of a plastic bag blow molding device proposed by the present invention;

[0028] Figure 6 This is a schematic diagram of the axonometric structure of an outer tube and a circular ring of a plastic bag blow molding device proposed by the present invention;

[0029] Figure 7 A schematic diagram of the circular isometric structure of a plastic bag blow molding device proposed by the present invention;

[0030] Figure 8 This is a schematic diagram of the axonometric structure of a dredging pipe of a plastic bag blow molding device proposed by the present invention.

[0031] In the figure: 1, frame; 2, blow molding machine; 3, feed hopper; 4, extruder; 5, center tube; 6, annular seat; 7, vertical tube; 8, outer tube; 9, first nozzle; 10, second nozzle; 11, fan; 12, annular tube; 13, connecting tube; 14, drive motor; 15, incomplete gear; 16, annular gear; 17, slider; 18, arc groove; 19, passive gear; 20, circular ring; 21, vertical rod; 22, guide wheel; 23, connecting rod; 24, short shaft; 25, roller; 26, guide rod; 27, cross rod; 28, limit plate; 29, spring; 30, dredging pipe; 31, trumpet cover; 32, hose; 33, exhaust hole; 34, annular plate; 35, transmission shaft; 36, transmission gear; 37, rack. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] Embodiment 1:

[0035] Reference Figure 1-Figure 8A plastic bag blow molding device comprises a frame 1, and also comprises: a blow molding machine 2 with a feed hopper 3 and an extrusion head 4, which is fixedly mounted on the frame 1, wherein a central tube 5 is fixedly connected to the extrusion head 4 of the blow molding machine 2, the central tube 5 is located at the center of the extrusion head 4, and a first nozzle 9 is installed on the outer wall of the central tube 5; a vertical tube 7 is arranged at the upper end of the extrusion head 4 and surrounds the central tube 5, wherein a plurality of outer tubes 8 arranged at equal intervals are fixedly mounted on the inner wall of the vertical tube 7, and the number of the outer tubes 8 is 8-20. The preferred number is 16, a second nozzle 10 facing the central tube 5 is fixedly mounted on the outer tube 8, the number of the first nozzle 9 and the second nozzle 10 is 20-50, and the preferred number in this application is 40, the blow molding machine 2 is provided with a reciprocating portion for driving the vertical tube 7 to reciprocate, a fan 11 is fixedly mounted on the extrusion head 4, the input end of the central tube 5 is connected to the output end of the fan 11, and the top of the vertical tube 7 is fixedly connected to a ring tube 12 connected to the outer tube 8, and the ring tube 12 is connected to the input end of the fan 11 through a connecting tube 13.

[0036] When in use, the raw material is added to the feed hopper 3, and the blow molding machine 2 can melt the raw material and extrude a tubular film through the extruder head 4. At this time, the fan 11 will transport air to the central tube 5 and spray it into the tubular film through the first nozzle 9 to complete the blow molding of the tubular film. During this period, the fan 11 will also transport the airflow to the annular tube 12 through the connecting tube 13, and the annular tube 12 will transport the airflow to the outer tube 8. The outer tube 8 will blow the airflow to the outer wall of the tubular film through the second nozzle 10, thereby achieving simultaneous cooling and shaping of the inside and outside of the tubular film. During the cooling and shaping period, the reciprocating part will drive the second nozzle 10 to reciprocate and rise and reciprocate around the axis of the vertical tube 7, thereby significantly increasing the exhaust area of ​​the second nozzle 10, so that the tubular film is subjected to more uniform cooling and shaping, thereby ensuring the final quality of the plastic bag.

[0037] Embodiment 2:

[0038] Reference Figure 1-Figure 5 , which is basically the same as Example 1, and furthermore, specifically discloses a specific implementation scheme of the reciprocating part.

[0039] The above-mentioned reciprocating part includes a driving motor 14 fixedly mounted on the blow molding machine 2, and the output shaft of the driving motor 14 is fixedly mounted with an incomplete gear 15, and the gear teeth of the incomplete gear 15 are only half, wherein the outer wall of the vertical tube 7 is fixedly mounted with a ring gear 16 meshing with the incomplete gear 15, and the extruder head 4 is fixedly connected with an annular seat 6, and the lower end of the vertical tube 7 is sleeved in the annular seat 6, and a lifting part is provided between the annular seat 6 and the vertical tube 7. When the vertical tube 7 rotates, the lifting part will lift the vertical tube 7 upward, and the lifting part includes a slider 17 fixedly mounted on the outer wall of the lower end of the vertical tube 7, and the outer wall of the annular seat 6 is provided with an inclined arc groove 18, and the slider 17 is sleeved in the arc groove 18. When the vertical tube 7 rotates, the slider 17 will slide along the arc groove 18.

[0040] During the cooling and shaping period, the driving motor 14 is started, and the driving motor 14 drives the incomplete gear 15 to rotate. The incomplete gear 15 will indirectly mesh with the ring gear 16. When meshing with each other, the ring gear 16 will drive the vertical tube 7 to rotate, and the vertical tube 7 will drive the multiple outer tubes 8 to revolve around the axis of the vertical tube 7. At the same time, the vertical tube 7 will drive the slider 17 to slide in the arc groove 18. The slider 17 will also drive the vertical tube 7 to slide upward under the action of the inclined arc groove 18. When the incomplete gear 15 is not in mesh with the ring gear 16, the vertical tube 7 will rotate. When the gear 16 is engaged, the vertical tube 7 will automatically fall downward and drive the slider 17 to slide back in the arc groove 18 to reset. The vertical tube 7 will reverse and reset again. Then the continuously rotating incomplete gear 15 will drive the vertical tube 7 to reciprocate and rise and fall. The vertical tube 7 will drive the second nozzle 10 to rise and fall through the outer tube 8 and reciprocate around the axis of the vertical tube 7, thereby significantly increasing the exhaust area of ​​the second nozzle 10, allowing the tubular film to be cooled and shaped more evenly, thereby ensuring the final quality of the plastic bag.

[0041] Embodiment three:

[0042] Reference Figure 5-Figure 7 , which is basically the same as the second embodiment, and further, a specific implementation scheme for guiding the tubular film is specifically added.

[0043] A plurality of longitudinally distributed circular rings 20 are arranged in the vertical tube 7, the number of the circular rings 20 is 3-10, and the preferred number in the present application is 6. The plurality of circular rings 20 are fixedly connected by connecting rods 23, and the inner walls of the plurality of circular rings 20 are rotatably mounted with a plurality of guide wheels 22 arranged at equal intervals, the number of the guide wheels 22 is 8-20, and the preferred number is 12. A linkage part for driving the circular rings 20 to move up and down is arranged in the vertical tube 7, and the linkage part includes a vertical rod 21 fixedly connected to the extrusion head 4, and the circular rings 20 are longitudinally slidably connected to the vertical rod 21, and a roller 25 is rotatably mounted on the inner wall of the vertical tube 7 through a short shaft 24, and the roller 25 abuts against the lower end of one of the circular rings 20.

[0044] Specifically, during the upward conveying of the tubular film, the tubular film will be tightly attached to the circle formed by multiple guide wheels 22, and the multiple guide wheels 22 can effectively guide the shape and conveying direction of the tubular film. When the vertical tube 7 moves upward, the vertical tube 7 will drive the roller 25 upward synchronously through the short shaft 24, and the roller 25 will press the ring 20 upward. The ring 20 will slide upward along the vertical rod 21 and drive the multiple guide wheels 22 to move upward. When the vertical tube 7 drives the roller 25 to move downward, the ring 20 will drive the guide wheel 22 to move downward. Therefore, the vertical tube 7 that reciprocates up and down will also drive the guide wheel 22 to reciprocate up and down along the outer wall of the tubular film to prevent the tubular film from wrinkling and deformation due to uneven force at local positions, thereby further improving the final quality of the plastic bag.

[0045] Embodiment 4:

[0046] Reference Figure 1-Figure 3 as well as Figure 8 , which is basically the same as the third embodiment, and further, a specific implementation plan for dredging the feed hopper 3 is specifically added.

[0047] A dredging pipe 30 is provided in the feed hopper 3 of the above-mentioned blow molding machine 2, and an exhaust hole 33 is provided on the outer wall of the dredging pipe 30. A trumpet-shaped cover 31 is fixedly connected to the top of the vertical pipe 7, and the trumpet-shaped cover 31 is connected to the dredging pipe 30 through a hose 32. The blow molding machine 2 is provided with a lifting part for driving the dredging pipe 30 to move up and down, and the lifting part includes a guide rod 26 fixedly connected to the blow molding machine 2, and a cross bar 27 is longitudinally slidably connected to the guide rod 26. A limit plate 28 is fixedly connected to the top of the guide rod 26, and a spring 29 is installed between the cross bar 27 and the limit plate 28, wherein the dredging pipe 30 is rotatably installed on the cross bar 27, and an annular plate 34 is fixedly connected to the outer wall of the vertical pipe 7, and one end of the cross bar 27 is placed on the upper end of the annular plate 34.

[0048] When the second nozzle 10 is exhausted, the exhausted gas will flow upward along the vertical pipe 7, and eventually part of the airflow will enter the hose 32 under the restriction of the trumpet-shaped cover 31. The hose 32 will transport part of the airflow to the dredging pipe 30, and the dredging pipe 30 will blow the airflow into the feed hopper 3 through the exhaust hole 33. On the one hand, the raw materials can be preheated by the residual temperature air, and on the other hand, some odors in the air can be absorbed by the raw materials, and at the same time, the feed hopper 3 is not prone to blockage.

[0049] When the vertical pipe 7 moves upward, the vertical pipe 7 will drive the annular plate 34 to move upward, and the annular plate 34 will press the cross bar 27 upward, and the cross bar 27 will drive the dredging pipe 30 to move upward, and the cross bar 27 will squeeze the spring 29. When the vertical pipe 7 moves downward and resets, the spring 29 will drive the cross bar 27 to elastically reset downward, and drive the dredging pipe 30 to move downward and reset. Therefore, the vertical pipe 7 that reciprocates up and down will make the dredging pipe 30 move up and down in the feed hopper 3, so that the feed hopper 3 is not easy to be blocked, and the exhaust hole 33 for exhaust can make the dredging effect and preheating effect better.

[0050] The lower end of the cross bar 27 is rotatably connected to a transmission shaft 35, and the transmission shaft 35 is connected to the dredging pipe 30 via two mutually meshing transmission gears 36. A passive gear 19 is fixedly mounted on the transmission shaft 35, and a rack 37 meshing with the passive gear 19 is fixedly mounted on the blow molding machine 2.

[0051] Specifically, when the cross bar 27 moves up and down, the cross bar 27 will drive the passive gear 19 to roll back and forth on the rack 37, and the passive gear 19 will drive the transmission shaft 35 to rotate back and forth. The transmission shaft 35 will drive the dredging pipe 30 to rotate back and forth through two mutually meshing transmission gears 36, and the dredging pipe 30 will drive the exhaust hole 33 to swing back and forth, thereby significantly improving the dredging effect on the feed hopper 3 and the preheating effect on the raw materials.

[0052] In practice, the specific processing steps are as follows:

[0053] Step 1: Add the raw materials into the feed hopper 3 and start the blow molding machine 2;

[0054] Step 2: Blowing air toward the inner wall and outer wall of the tubular film through the first nozzle 9 and the second nozzle 10;

[0055] Step 3: The second nozzle 10 is lifted and lowered reciprocatingly and reciprocated around the axis of the tubular film;

[0056] Step 4: Make the guide wheel 22 reciprocate up and down on the outer wall of the tubular film;

[0057] Step 5: Make the dredging pipe 30 in the feed hopper 3 move up and down reciprocatingly.

[0058] When the plastic bag blow molding device is in use, raw materials are added to the feed hopper 3, and the blow molding machine 2 can melt the raw materials and extrude a tubular film through the extruder head 4. At this time, the fan 11 will transport air to the central tube 5 and spray it into the tubular film through the first nozzle 9 to complete the blow molding process of the tubular film. During this period, the fan 11 will also transport the airflow to the annular tube 12 through the connecting tube 13, and the annular tube 12 will transport the airflow to the outer tube 8. The outer tube 8 will blow the airflow to the outer wall of the tubular film through the second nozzle 10, thereby realizing simultaneous cooling and shaping of the inside and outside of the tubular film.

[0059] During the cooling and shaping period, the driving motor 14 is started, and the driving motor 14 drives the incomplete gear 15 to rotate. The incomplete gear 15 will indirectly mesh with the ring gear 16. When meshing with each other, the ring gear 16 will drive the vertical tube 7 to rotate, and the vertical tube 7 will drive the multiple outer tubes 8 to revolve around the axis of the vertical tube 7. At the same time, the vertical tube 7 will drive the slider 17 to slide in the arc groove 18. The slider 17 will also drive the vertical tube 7 to slide upward under the action of the inclined arc groove 18. When the incomplete gear 15 is not in mesh with the ring gear 16, the vertical tube 7 will rotate. When the gear 16 is engaged, the vertical tube 7 will automatically fall downward and drive the slider 17 to slide back in the arc groove 18 to reset. The vertical tube 7 will reverse and reset again. Then the continuously rotating incomplete gear 15 will drive the vertical tube 7 to reciprocate and rise and fall. The vertical tube 7 will drive the second nozzle 10 to rise and fall through the outer tube 8 and reciprocate around the axis of the vertical tube 7, thereby significantly increasing the exhaust area of ​​the second nozzle 10, allowing the tubular film to be cooled and shaped more evenly, thereby ensuring the final quality of the plastic bag.

[0060] During the upward conveying of the tubular film, the tubular film will be tightly attached to the circle formed by multiple guide wheels 22, and the multiple guide wheels 22 can effectively guide the shape and conveying direction of the tubular film. When the vertical tube 7 moves upward, the vertical tube 7 will drive the roller 25 upward synchronously through the short shaft 24, and the roller 25 will press the ring 20 upward. The ring 20 will slide upward along the vertical rod 21 and drive the multiple guide wheels 22 to move upward. When the vertical tube 7 drives the roller 25 to move downward, the ring 20 will drive the guide wheel 22 to move downward. Therefore, the vertical tube 7 that reciprocates up and down will also drive the guide wheel 22 to reciprocate up and down along the outer wall of the tubular film to prevent the tubular film from wrinkling and deformation due to uneven force at local positions, thereby further improving the final quality of the plastic bag.

[0061] When the second nozzle 10 is exhausted, the exhausted gas will flow upward along the vertical pipe 7, and eventually part of the airflow will enter the hose 32 under the restriction of the trumpet-shaped cover 31. The hose 32 will transport part of the airflow to the dredging pipe 30, and the dredging pipe 30 will blow the airflow into the feed hopper 3 through the exhaust hole 33. On the one hand, the raw materials can be preheated by the residual temperature air, and on the other hand, some odors in the air can be absorbed by the raw materials, and at the same time, the feed hopper 3 is not prone to blockage.

[0062] When the vertical pipe 7 moves upward, the vertical pipe 7 will drive the annular plate 34 to move upward, and the annular plate 34 will press the cross bar 27 upward, and the cross bar 27 will drive the dredging pipe 30 to move upward, and the cross bar 27 will squeeze the spring 29. When the vertical pipe 7 moves downward and resets, the spring 29 will drive the cross bar 27 to elastically reset downward, and drive the dredging pipe 30 to move downward and reset. Therefore, the vertical pipe 7 that reciprocates up and down will make the dredging pipe 30 move up and down in the feed hopper 3, so that the feed hopper 3 is not easy to be blocked, and the exhaust hole 33 for exhaust can make the dredging effect and preheating effect better.

[0063] When the cross bar 27 moves up and down, the cross bar 27 will drive the passive gear 19 to roll back and forth on the rack 37, and the passive gear 19 will drive the transmission shaft 35 to rotate back and forth. The transmission shaft 35 will drive the dredging pipe 30 to rotate back and forth through two mutually meshing transmission gears 36, and the dredging pipe 30 will drive the exhaust hole 33 to swing back and forth, which significantly improves the dredging effect on the feed hopper 3 and the preheating effect on the raw materials.

[0064] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A plastic bag blow molding device, comprising a frame (1), characterized in that: Also includes: The blow molding machine (2) is fixedly mounted on the frame (1). Wherein, a central tube (5) is fixedly connected to the extrusion head (4) of the blow molding machine (2), and a first nozzle (9) is installed on the outer wall of the central tube (5); A vertical pipe (7) is arranged at the upper end of the extrusion head (4) and surrounds the central pipe (5). The inner wall of the vertical tube (7) is fixedly mounted with a plurality of outer tubes (8) arranged at equal intervals, the outer tube (8) is fixedly mounted with a second nozzle (10) facing the central tube (5), and the blow molding machine (2) is provided with a reciprocating part for driving the vertical tube (7) to reciprocate.

2. A plastic bag blow molding device according to claim 1, characterized in that: The reciprocating part comprises a driving motor (14) fixedly mounted on the blow molding machine (2), and an incomplete gear (15) is fixedly mounted on the output shaft of the driving motor (14). The outer wall of the vertical tube (7) is fixedly mounted with a ring gear (16) meshing with the incomplete gear (15); the extruder head (4) is fixedly connected with a ring seat (6); the lower end of the vertical tube (7) is sleeved in the ring seat (6); a lifting portion is provided between the ring seat (6) and the vertical tube (7); when the vertical tube (7) rotates, the lifting portion will lift the vertical tube (7) upward.

3. A plastic bag blow molding device according to claim 2, characterized in that: The lifting part comprises a slider (17) fixedly mounted on the outer wall of the lower end of the vertical tube (7); the outer wall of the annular seat (6) is provided with an inclined arc groove (18); the slider (17) is sleeved in the arc groove (18); when the vertical tube (7) rotates, the slider (17) slides along the arc groove (18).

4. A plastic bag blow molding device according to claim 1, characterized in that: A fan (11) is fixedly mounted on the extrusion head (4); the input end of the central tube (5) is connected to the output end of the fan (11); the top of the vertical tube (7) is fixedly connected to an annular tube (12) that is in communication with the outer tube (8); and the annular tube (12) is in communication with the input end of the fan (11) via a connecting tube (13).

5. A plastic bag blow molding device according to claim 2, characterized in that: A plurality of longitudinally distributed circular rings (20) are arranged in the vertical tube (7), the plurality of circular rings (20) are fixedly connected by connecting rods (23), a plurality of guide wheels (22) arranged at equal intervals are rotatably mounted on the inner walls of the plurality of circular rings (20), and a linkage part for driving the circular rings (20) to move up and down is arranged in the vertical tube (7).

6. A plastic bag blow molding device according to claim 5, characterized in that: The linkage part comprises a vertical rod (21) fixedly connected to the extruder head (4), the circular ring (20) is longitudinally slidably connected to the vertical rod (21), and a roller (25) is rotatably mounted on the inner wall of the vertical tube (7) via a short shaft (24), and the roller (25) abuts against the lower end of one of the circular rings (20).

7. A plastic bag blow molding device according to claim 2, characterized in that: A dredging pipe (30) is provided in the feed hopper (3) of the blow molding machine (2), and an exhaust hole (33) is provided on the outer wall of the dredging pipe (30). A trumpet-shaped cover (31) is fixedly connected to the top of the vertical pipe (7), and the trumpet-shaped cover (31) is connected to the dredging pipe (30) through a hose (32). The blow molding machine (2) is provided with a lifting part for driving the dredging pipe (30) to move up and down.

8. A plastic bag blow molding device according to claim 7, characterized in that: The lifting part comprises a guide rod (26) fixedly connected to the blow molding machine (2), a cross rod (27) being longitudinally slidably connected to the guide rod (26), a limit plate (28) being fixedly connected to the top of the guide rod (26), and a spring (29) being installed between the cross rod (27) and the limit plate (28). The dredging pipe (30) is rotatably mounted on the cross bar (27), the outer wall of the vertical pipe (7) is fixedly connected with an annular plate (34), and one end of the cross bar (27) rests on the upper end of the annular plate (34).

9. A plastic bag blow molding device according to claim 8, characterized in that: The lower end of the crossbar (27) is rotatably connected to a transmission shaft (35), and the transmission shaft (35) is connected to the dredging pipe (30) via two mutually meshing transmission gears (36).

10. A plastic bag blow molding device according to claim 9, characterized in that: A passive gear (19) is fixedly mounted on the transmission shaft (35), and a rack (37) meshingly connected with the passive gear (19) is fixedly mounted on the blow molding machine (2).

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