Degradable express packaging bag film blowing device

Abstract

The degradable express packaging bag film blowing device comprises a base and an extruder, a workbench is fixedly installed on one side of the top of the base, the side face of the workbench is fixedly connected with the extruder, a preheating mechanism used for drying degradable particles is arranged on the top of the workbench, and the input end of the extruder fixedly communicates with a feeding hopper; an electric heating rod is started and matched with an electric heating plate to increase the temperature in the preheating box, when the extending end of a second air cylinder extends to the longest, a heat preservation plate presses a turnover frame to rotate, so that a lifting rod ascends, a baffle is driven to turn over, degradable particles can quantitatively roll into a first discharging pipe conveniently, and the degradable particles are sequentially sucked in through a material suction pipe; according to the degradable particle drying device, the air flow carrying the degradable particles is blown out in cooperation with the material blowing pipe, in the process that the degradable particles collide with the buffer plate, adhesion between the degradable particles is reduced, meanwhile, the contact area between the degradable particles and the hot air flow is increased, and therefore the drying speed and efficiency of the degradable particles are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging bag production, and particularly to a blown film device for degradable express packaging bags. Background Technique

[0002] The blown film device for degradable express packaging bags is a processing equipment designed specifically for the production of environmentally friendly express packaging materials. Its core lies in adapting to the characteristics of degradable materials, and it is necessary to optimize the entire process according to the material characteristics, taking into account both production efficiency and environmental protection requirements. At the same time, intelligent technologies are integrated to reduce manual intervention, providing a reliable solution for green logistics packaging. The raw material for production is degradable particles;

[0003] Before putting the existing degradable particles into the blown film device, generally, the degradable particles contain hydrophilic materials and are prone to moisture absorption during long-term storage and transportation, and need to be dried in advance. Since the degradable particles are in a stacked state, the existing drying methods are difficult to efficiently remove the moisture contained therein, and it is easy to form bubbles inside or on the surface of the produced packaging bags. At the same time, due to the rougher surface of the degradable particles after drying, they are prone to blockage during the feeding process into the extruder, affecting the subsequent normal feeding process. Summary of the Invention

[0004] The technical problems solved by this solution are as follows:

[0005] (1) How to solve the problem that since the degradable particles are in a stacked state, the existing drying methods are difficult to efficiently remove the moisture contained therein, and it is easy to form bubbles inside or on the surface of the produced packaging bags;

[0006] (2) How to solve the problem that due to the rougher surface of the degradable particles after drying, they are prone to blockage during the feeding process into the extruder, affecting the subsequent normal feeding process.

[0007] The object of the present invention can be achieved by the following technical solutions: A blown film device for degradable express packaging bags, including a base and an extruder. One side of the top of the base is fixedly installed with a workbench, the side of the workbench is fixedly connected to the extruder, and a preheating mechanism for drying degradable particles is arranged on the top of the workbench. The input end of the extruder is fixedly communicated with a feed hopper;

[0008] The preheating mechanism includes a positioning frame fixedly connected to the top of the workbench. A preheating box is fixedly installed in the middle of the positioning frame through a connecting seat. A collecting unit for absorbing degradable particles is arranged on the side of the preheating box facing the positioning frame, and a limiting unit for adjusting the feeding of degradable particles is arranged inside the preheating box.

[0009] A further technical improvement of the present invention lies in that: the bottom of the inner wall of the preheating box is set to be inclined, and a first discharge pipe is connected to the bottom of the preheating box. The input end of the first discharge pipe corresponds to the bottom of the inclined plane of the inner wall of the preheating box, and the output end of the first discharge pipe is connected to a horizontally arranged adjusting pipe; a second discharge pipe corresponding to the position of the first discharge pipe is connected to the middle of the adjusting pipe, and the output end of the second discharge pipe is arranged towards the opening of the feed hopper.

[0010] A further technical improvement of the present invention lies in that: a horizontally arranged first cylinder is fixedly installed on the positioning frame. The extending end of the first cylinder is fixedly connected to a transmission rod. One end of the transmission rod movably penetrates the adjusting pipe and is fixedly installed with a first piston, and a second piston is fixedly installed in the middle of the transmission rod.

[0011] A further technical improvement of the present invention lies in that: the collection unit includes a support seat fixedly connected to the outer wall of the preheating box. A pump body is fixedly installed on the top of the support seat. The output end of the pump body is fixedly connected to a blowing pipe. The output end of the blowing pipe penetrates the preheating box. A distribution pipe is fixedly arranged at the bottom of the support seat. One end of the distribution pipe is connected to a suction pipe. The input end of the suction pipe penetrates the preheating box and extends into the first discharge pipe. The input end of the pump body is connected to the middle of the distribution pipe. The diameter of the suction pipe is one-third of the inner diameter of the first discharge pipe.

[0012] A further technical improvement of the present invention lies in that: a third piston is slidably arranged on the inner wall of the distribution pipe. A push-pull rod is fixedly connected to the third piston. One end of the push-pull rod movably penetrates the distribution pipe. A first tension spring is fixedly connected between the third piston and the inner wall of the distribution pipe. An air suction hole is opened on the bottom side of the distribution pipe far from the suction pipe.

[0013] A further technical improvement of the present invention lies in that: a transmission plate is rotatably arranged on the connection seat. One end of the push-pull rod is movably connected to the top of the transmission plate. A dial rod is also fixedly installed on the extending end of the first cylinder. The dial rod is slidably connected to the bottom of the transmission plate.

[0014] A further technical improvement of the present invention lies in that: a blocking unit for heat preservation of the degradable particles is arranged above the preheating box. The blocking unit includes a second cylinder fixedly connected to the top of the positioning frame. The second cylinder is longitudinally arranged, and the extending end of the second cylinder is fixedly installed with a heat preservation plate. The size of the heat preservation plate is smaller than the size of the opening of the preheating box.

[0015] A further technical improvement of the present invention lies in that: an electric heating rod and a buffer plate are fixedly installed at the bottom of the heat preservation plate, and the side position of the buffer plate corresponds to the output end position of the blowing pipe; by controlling the extension end of the first cylinder to extend to half of its length, the first piston still blocks the output end of the first discharging pipe. At this time, under the action of the first tension spring, the third piston blocks the air suction hole, and the air in the first discharging pipe is absorbed through the suction pipe. Then, control the extension end of the second cylinder to extend to the longest, so that the heat preservation plate blocks most of the area at the opening of the preheating box, preventing the heat in the preheating box from dissipating too quickly. Then, turn on the electric heating rod and cooperate with the electric heating plate to increase the temperature in the preheating box. When the extension end of the second cylinder extends to the longest, the heat preservation plate presses the turning frame to rotate, causing the lifting rod to rise, which will drive the baffle to turn over, facilitating the quantitative rolling of the degradable particles into the first discharging pipe. The degradable particles are successively sucked in through the suction pipe, and then the air flow carrying the degradable particles is blown out through the blowing pipe. During the impact of the degradable particles and the buffer plate, the adhesion between the degradable particles will be reduced, and at the same time, the contact area between the degradable particles and the hot air flow will be increased, thereby improving the drying speed and efficiency of the degradable particles.

[0016] A further technical improvement of the present invention lies in that: the limiting unit includes a partition plate fixedly connected to the inner wall of the preheating box. A baffle is hinged to the bottom of the side of the partition plate close to the first discharging pipe. A connecting plate is fixedly installed on the baffle. An electric heating plate is fixedly installed on the partition plate above the baffle; a lifting rod is arranged on one side of the partition plate. The bottom end of the lifting rod is movably connected to the connecting plate. Two guiding sleeves for guiding the lifting rod are fixedly installed on the inner wall of the preheating box.

[0017] A further technical improvement of the present invention lies in that: a turning frame is also rotatably arranged on the inner wall of the preheating box. One end of the turning frame is rotatably provided with a roller, and the other end of the turning frame is movably connected to the top end of the lifting rod. The end of the turning frame far from the roller is fixedly connected to the partition plate through a second tension spring; after the drying of the degradable particles is completed, first control the extension end of the first cylinder to extend to the longest, so that the output end of the first discharging pipe is located between the first piston and the second piston, and then turn off the pump body, facilitating the quantitative and slow entry of the degradable particles along the first discharging pipe and the second discharging pipe into the feed hopper, preventing it from being blocked and affecting the subsequent normal feeding process.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] When the present invention is in use, by controlling the extension end of the first cylinder to extend to half of its length, the first piston still blocks the output end of the first discharge pipe. At this time, under the action of the first tension spring, the third piston blocks the air suction hole, and in cooperation with the suction pipe, the air in the first discharge pipe is absorbed. Then, control the extension end of the second cylinder to extend to the longest, so that the heat preservation plate blocks most of the opening area of the preheating box, preventing the heat in the preheating box from dissipating too quickly. Then, turn on the electric heating rod, and in cooperation with the electric heating plate, increase the temperature in the preheating box. When the extension end of the second cylinder extends to the longest, the turning frame is rotated by pressing with the heat preservation plate, so that the lifting rod rises, driving the baffle to turn over, facilitating the quantitative rolling of the degradable particles into the first discharge pipe, sucking them in turn through the suction pipe, and then blowing out the air flow carrying the degradable particles through the blowing pipe. During the impact of the degradable particles with the buffer plate, the adhesion between the degradable particles will be reduced, and at the same time, the contact area between them and the hot air flow will be increased, thereby improving the drying speed and efficiency of the degradable particles.

[0020] When the present invention is in use, after the drying of the degradable particles is completed, first control the extension end of the first cylinder to extend to the longest, so that the output end of the first discharge pipe is located between the first piston and the second piston, and then turn off the pump body, facilitating the quantitative and slow entry of the degradable particles along the first discharge pipe and the second discharge pipe into the feed hopper, preventing it from being blocked and affecting the subsequent normal feeding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a front view schematic diagram of the overall structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the preheating mechanism of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the collection unit of the present invention;

[0026] Figure 5 It is a partial structure schematic diagram of the preheating mechanism of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the limiting unit of the present invention;

[0028] Figure 7 It is a three-dimensional schematic diagram of the structure of the blocking unit of the present invention.

[0029] In the figure: 1, mounting bracket; 2, storage tooling; 3, blown film tooling; 4, workbench; 5, base; 6, extruder; 7, feed hopper; 8, preheating mechanism; 801, positioning bracket; 802, collection unit; 803, connecting seat; 804, first cylinder; 805, transmission rod; 806, adjusting pipe; 807, preheating box; 808, limiting unit; 809, blocking unit; 810, second piston; 811, lever; 812, second discharge pipe; 813, first piston; 814, first discharge pipe; 8021, blowing pipe; 8022, pump body; 8023, support seat; 8024, transmission plate; 8025, push-pull rod; 8026, suction hole; 8027, third piston; 8028, suction pipe; 8029, distribution pipe; 8081, roller; 8082, second tension spring; 8083, electric heating plate; 8084, partition board; 8085, baffle; 8086, connecting plate; 8087, lifting rod; 8088, flipping frame; 8091, second cylinder; 8092, heat preservation board; 8093, buffer board; 8094, electric heating rod. Detailed implementation manners

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1 - 7 As shown in the figure, a blown film device for degradable express delivery packaging bags includes a base 5 and an extruder 6. One side of the top of the base 5 is fixedly installed with a workbench 4, the side of the workbench 4 is fixedly connected to the extruder 6, and a preheating mechanism 8 for drying degradable particles is arranged on the top of the workbench 4. The input end of the extruder 6 is fixedly communicated with a feed hopper 7.

[0032] Please refer to Figure 3 and Figure 5 As shown in the figure, the above-mentioned preheating mechanism 8 includes a positioning bracket 801 fixedly connected to the top of the workbench 4. A preheating box 807 is fixedly installed in the middle of the positioning bracket 801 through a connecting seat 803. A collection unit 802 for absorbing degradable particles is arranged on the side of the preheating box 807 facing the positioning bracket 801, and a limiting unit 808 for adjusting the feeding of degradable particles is arranged inside the preheating box 807.

[0033] Please refer to Figure 3 and Figure 5As shown, the bottom of the inner wall of the above-mentioned preheating box 807 is set to be inclined, and the bottom of the preheating box 807 is connected to a first discharge pipe 814. The input end of the first discharge pipe 814 corresponds to the bottom of the inclined surface of the inner wall of the preheating box 807, and the output end of the first discharge pipe 814 is connected to a horizontally arranged adjusting pipe 806.

[0034] Please refer to Figure 5 As shown, a second discharge pipe 812 corresponding to the position of the first discharge pipe 814 is connected to the middle of the above-mentioned adjusting pipe 806, and the output end of the second discharge pipe 812 is arranged towards the opening of the feed hopper 7.

[0035] Please refer to Figure 5 As shown, a horizontally arranged first cylinder 804 is fixedly installed on the above-mentioned positioning frame 801. The extending end of the first cylinder 804 is fixedly connected to a transmission rod 805. One end of the transmission rod 805 movably penetrates the adjusting pipe 806 and is fixedly installed with a first piston 813. A second piston 810 is fixedly installed in the middle of the transmission rod 805.

[0036] Please refer to Figure 2 and Figure 6 As shown, the above-mentioned collection unit 802 includes a support seat 8023 fixedly connected to the outer wall of the preheating box 807. A pump body 8022 is fixedly installed on the top of the support seat 8023. The output end of the pump body 8022 is fixedly connected to a blowing pipe 8021, and the output end of the blowing pipe 8021 penetrates the preheating box 807.

[0037] Please refer to Figure 4 and Figure 5 As shown, a distribution pipe 8029 is fixedly arranged at the bottom of the above-mentioned support seat 8023. One end of the distribution pipe 8029 is connected to a suction pipe 8028. The input end of the suction pipe 8028 penetrates the preheating box 807 and extends into the first discharge pipe 814. The input end of the pump body 8022 is connected to the middle of the distribution pipe 8029. The diameter of the suction pipe 8028 is one-third of the inner diameter of the first discharge pipe 814.

[0038] Please refer to Figure 4 As shown, a third piston 8027 is slidably arranged on the inner wall of the above-mentioned distribution pipe 8029. A push-pull rod 8025 is fixedly connected to the third piston 8027. One end of the push-pull rod 8025 movably penetrates the distribution pipe 8029. A first tension spring is fixedly connected between the third piston 8027 and the inner wall of the distribution pipe 8029. An air suction hole 8026 is opened on the bottom side of the distribution pipe 8029 away from the suction pipe 8028.

[0039] Please refer to Figure 4 and Figure 5As shown, a transmission plate 8024 is rotatably arranged on the above-mentioned connecting seat 803. One end of a push-pull rod 8025 is movably connected to the top of the transmission plate 8024. The extending end of a first air cylinder 804 is also fixedly installed with a dial rod 811, and the dial rod 811 is slidably connected to the bottom of the transmission plate 8024.

[0040] Please refer to Figure 2 and Figure 7 As shown, a blocking unit 809 for heat preservation of degradable particles is arranged above the above-mentioned preheating box 807. The blocking unit 809 includes a second air cylinder 8091 fixedly connected to the top of a positioning frame 801. The second air cylinder 8091 is longitudinally arranged, and the extending end of the second air cylinder 8091 is fixedly installed with a heat preservation plate 8092. The size of the heat preservation plate 8092 is smaller than the size of the opening of the preheating box 807.

[0041] Please refer to Figure 7 As shown, an electric heating rod 8094 and a buffer plate 8093 are fixedly installed at the bottom of the above-mentioned heat preservation plate 8092. The side position of the buffer plate 8093 corresponds to the output end position of a blowing pipe 8021; by controlling the extending end of the first air cylinder 804 to extend to half of its length, the first piston 813 still blocks the output end of the first discharge pipe 814. At this time, under the action of the first tension spring, the third piston 8027 blocks the air suction hole 8026, and the air in the first discharge pipe 814 is absorbed through the suction pipe 8028. Then, control the extending end of the second air cylinder 8091 to extend to the longest, so that the heat preservation plate 8092 blocks most of the area at the opening of the preheating box 807, preventing the heat in the preheating box 807 from dissipating too quickly. Then turn on the electric heating rod 8094, and cooperate with the electric heating plate 8083 to increase the temperature in the preheating box 807. When the extending end of the second air cylinder 8091 extends to the longest, the heat preservation plate 8092 presses the turning frame 8088 to rotate, causing the lifting rod 8087 to rise, which will drive the baffle 8085 to turn over, facilitating the quantitative rolling of the degradable particles into the first discharge pipe 814. They are successively sucked in through the suction pipe 8028, and then cooperate with the blowing pipe 8021 to blow out the air flow carrying the degradable particles. During the impact of the degradable particles on the buffer plate 8093, the adhesion between the degradable particles will be reduced, and at the same time, the contact area between them and the hot air flow will be increased, thereby improving the drying speed and efficiency of the degradable particles.

[0042] Please refer to Figure 2 and Figure 6 As shown, the above-mentioned limiting unit 808 includes a partition plate 8084 fixedly connected to the inner wall of the preheating box 807. A baffle 8085 is hinged to the bottom of the side of the partition plate 8084 close to the first discharge pipe 814. A connecting plate 8086 is fixedly installed on the baffle 8085. An electric heating plate 8083 is fixedly installed on the partition plate 8084 above the baffle 8085.

[0043] Please refer toFigure 6 As shown, a lifting rod 8087 is provided on one side of the above-mentioned partition plate 8084. The bottom end of the lifting rod 8087 is movably connected to the connecting plate 8086, and two guide sleeves for guiding the lifting rod 8087 are fixedly installed on the inner wall of the preheating box 807.

[0044] Please refer to Figure 6 As shown, a turning frame 8088 is also rotatably provided on the inner wall of the above-mentioned preheating box 807. A roller 8081 is rotatably provided at one end of the turning frame 8088, and the other end of the turning frame 8088 is movably connected to the top end of the lifting rod 8087. The end of the turning frame 8088 away from the roller 8081 is fixedly connected to the partition plate 8084 through a second tension spring 8082; after drying the degradable particles, first control the extending end of the first cylinder 804 to extend to the longest, so that the output end of the first discharge pipe 814 is located between the first piston 813 and the second piston 810, and then close the pump body 8022, so that the degradable particles can enter the feed hopper 7 quantitatively and slowly along the first discharge pipe 814 and the second discharge pipe 812, preventing it from being blocked and affecting the subsequent normal feeding process.

[0045] Please refer to Figure 1 and Figure 2 As shown, a blown film tooling 3 is also fixedly installed on the top of the above-mentioned base 5. The blown film tooling 3 is a prior art, and an installation frame 1 for guiding the packaging bag is provided on one side of the blown film tooling 3.

[0046] Please refer to Figure 1 and Figure 2 As shown, a storage tooling 2 for winding the packaging bag is fixedly provided on the base 5 on the side of the installation frame 1 away from the workbench 4. The storage tooling 2 is a prior art.

[0047] Working principle: When the present invention is in use, first, the extending end of the second cylinder 8091 is retracted to the shortest length. The degradable particles are introduced into the preheating box 807 by an external feeding device. At this time, the degradable particles are located on the side of the partition plate 8084 away from the electric heating plate 8083. Due to the action of the tension spring, the baffle 8085 blocks the degradable particles. The electric heating plate 8083 is turned on, so that the partition plate 8084 transfers heat to the degradable particles. By controlling the extending end of the first cylinder 804 to retract to the shortest length, the transmission rod 805 drives the first piston 813 to block the output end of the first discharge pipe 814. During this process, the toggle lever 811 drives the transmission plate 8024 to flip, so that the push-pull rod 8025 drives the third piston 8027 to block the suction pipe 8028. The pump body 8022 is turned on, so that external air enters the distribution pipe 8029 through the suction holes 8026, and then the pump body 8022 cooperates with the blowing pipe 8021 to blow air into the preheating box 807, accelerating the air flow rate therein and facilitating the primary drying of the degradable particles; by controlling the extending end of the first cylinder 804 to extend to half of its length, the first piston 813 still blocks the output end of the first discharge pipe 814. At this time, due to the action of the first tension spring, the third piston 8027 blocks the suction holes 8026, and the air in the first discharge pipe 814 is absorbed in cooperation with the suction pipe 8028. Then, the extending end of the second cylinder 8091 is extended to the longest length, so that the heat preservation plate 8092 blocks most of the opening area of the preheating box 807, preventing the heat in the preheating box 807 from dissipating too quickly. Then, the electric heating rod 8094 is turned on, and in cooperation with the electric heating plate 8083, the temperature in the preheating box 807 is increased. When the extending end of the second cylinder 8091 is extended to the longest length, the turning frame 8088 is rotated by pressing with the heat preservation plate 8092, so that the lifting rod 8087 rises, driving the baffle 8085 to flip, facilitating the quantitative rolling of the degradable particles into the first discharge pipe 814. They are successively sucked in through the suction pipe 8028, and then the air flow carrying the degradable particles is blown out in cooperation with the blowing pipe 8021. During the impact of the degradable particles with the buffer plate 8093, the adhesion between the degradable particles is reduced, and at the same time, the contact area between them and the hot air flow is increased, thereby improving the drying speed and efficiency of the degradable particles; after the drying of the degradable particles is completed, first, the extending end of the first cylinder 804 is extended to the longest length, so that the output end of the first discharge pipe 814 is located between the first piston 813 and the second piston 810, and then the pump body 8022 is turned off, facilitating the quantitative and slow entry of the degradable particles along the first discharge pipe 814 and the second discharge pipe 812 into the feed hopper 7, preventing it from being blocked and affecting the subsequent normal feeding process.

[0048] As described above, these are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content without departing from the technical solution of the present invention. However, as long as it does not depart from the technical solution content of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A film blowing device for a degradable express packaging bag, comprising a base (5) and an extruder (6), wherein a workbench (4) is fixedly mounted on one side of the top of the base (5), characterized in that: A preheating mechanism (8) for drying the degradable particles is disposed on the top of the workbench (4), and a feed hopper (7) is fixedly connected to the input end of the extruder (6); The preheating mechanism (8) comprises a positioning frame (801) fixedly connected to the top of the workbench (4); a preheating box (807) is fixedly installed in the middle of the positioning frame (801) via a connecting seat (803); a collecting unit (802) for absorbing degradable particles is arranged on the side of the preheating box (807); and a limiting unit (808) for adjusting the discharge of degradable particles is arranged inside the preheating box (807).

2. A film blowing device for a degradable express packaging bag according to claim 1, characterized in that: The bottom of the inner wall of the preheating box (807) is arranged to be inclined, and the bottom of the preheating box (807) is connected to a first discharge pipe (814), the input end of the first discharge pipe (814) corresponds to the bottom of the inclined surface of the inner wall of the preheating box (807), and the output end of the first discharge pipe (814) is connected to a transversely arranged regulating pipe (806); The middle part of the regulating pipe (806) is connected to a second discharge pipe (812) corresponding to the position of the first discharge pipe (814), and the output end of the second discharge pipe (812) is arranged toward the opening of the feed hopper (7).

3. The film blowing device for a degradable express packaging bag according to claim 1 is characterized in that: A first cylinder (804) is fixedly mounted on the positioning frame (801); a protruding end of the first cylinder (804) is fixedly connected to a transmission rod (805); one end of the transmission rod (805) movably passes through an adjustment tube (806) and is fixedly mounted with a first piston (813); a second piston (810) is fixedly mounted in the middle of the transmission rod (805).

4. A film blowing device for a degradable express packaging bag according to claim 3, characterized in that: The collecting unit (802) comprises a support seat (8023) fixedly connected to the outer wall of the preheating box (807); a pump body (8022) is fixedly installed on the top of the support seat (8023); the output end of the pump body (8022) is fixedly connected to a blowing pipe (8021); the output end of the blowing pipe (8021) passes through the preheating box (807); a distribution pipe (8029) is fixedly arranged at the bottom of the support seat (8023); one end of the distribution pipe (8029) is connected to a suction pipe (8028); the input end of the suction pipe (8028) extends into the first discharge pipe (814); the input end of the pump body (8022) is connected to the middle part of the distribution pipe (8029); the diameter of the suction pipe (8028) is one third of the inner diameter of the first discharge pipe (814).

5. A film blowing device for a degradable express packaging bag according to claim 4, characterized in that: A third piston (8027) is slidably provided on the inner wall of the distribution tube (8029), a push-pull rod (8025) is fixedly connected to the third piston (8027), one end of the push-pull rod (8025) movably passes through the distribution tube (8029), a first tension spring is fixedly connected between the third piston (8027) and the inner wall of the distribution tube (8029), and a suction hole (8026) is provided on the bottom side of the distribution tube (8029) away from the suction tube (8028).

6. A film blowing device for a degradable express packaging bag according to claim 5, characterized in that: A transmission plate (8024) is rotatably arranged on the connection seat (803), one end of the push-pull rod (8025) is movably connected to the top of the transmission plate (8024), and a shifting rod (811) is fixedly installed on the protruding end of the first cylinder (804), and the shifting rod (811) is slidably connected to the bottom of the transmission plate (8024).

7. The film blowing device for a degradable express packaging bag according to claim 1, characterized in that: A blocking unit (809) for keeping the degradable particles warm is arranged above the preheating box (807), and the blocking unit (809) comprises a second cylinder (8091) fixedly connected to the top of the positioning frame (801), and a heat preservation plate (8092) is fixedly installed on the protruding end of the second cylinder (8091), and the size of the heat preservation plate (8092) is smaller than the size of the opening of the preheating box (807).

8. The film blowing device for a degradable express packaging bag according to claim 7, characterized in that: An electric heating rod (8094) and a buffer plate (8093) are fixedly installed at the bottom of the insulation plate (8092), and the side position of the buffer plate (8093) corresponds to the output end position of the blowing tube (8021).

9. The film blowing device for a degradable express packaging bag according to claim 1, characterized in that: The limiting unit (808) comprises a partition (8084) fixedly connected to the inner wall of the preheating box (807), a baffle (8085) is hingedly connected to the bottom of the side of the partition (8084), a connecting plate (8086) is fixedly installed on the baffle (8085), and an electric heating plate (8083) is fixedly installed on the partition (8084) above the baffle (8085); A lifting rod (8087) is provided on one side of the partition (8084), and the bottom end of the lifting rod (8087) is movably connected to the connecting plate (8086).

10. A film blowing device for a degradable express packaging bag according to claim 9, characterized in that: A flip frame (8088) is rotatably provided on the inner wall of the preheating box (807), a roller (8081) is rotatably provided on one end of the flip frame (8088), and the other end of the flip frame (8088) is movably connected to the top end of the lifting rod (8087), and the end of the flip frame (8088) away from the roller (8081) is fixedly connected to the partition (8084) via a second tension spring (8082).

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