Plastic bag blowing machine

Abstract

This invention relates to the field of blown film technology for plastic FIBCs (Flexible Intermediate Bulk Containers), specifically to a blown film machine for plastic FIBCs. The machine includes a blown film mechanism, a film body auxiliary pressure mechanism within the blown film mechanism, a film diameter adjustment mechanism within the film body auxiliary pressure mechanism, and a film support mechanism within the film body auxiliary pressure mechanism. The blown film mechanism is used in conjunction with an extruder to blown film molten plastic granules. The film body auxiliary pressure mechanism includes a pressure-bearing base and an anti-detachment pad at the bottom of the pressure-bearing base. This invention adds a film diameter adjustment mechanism and a film support mechanism to the existing blown film machine. When the molten masterbatch passes through the blown film machine and is drawn upwards, the upwardly extending film support mechanism, in conjunction with a guide hood, guides the outward expansion of the bottom portion of the FIBC, preventing the FIBC from wrinkling or deforming inwards due to environmental factors and high-pressure airflow interference.

Description

Technical Field

[0001] This invention relates to the field of blown film technology for plastic container bags, specifically a blown film machine for plastic container bags. Background Technology

[0002] A blown film machine is a device that melts plastic particles and blows them into a thin film. Depending on the type of film produced, there are different types of blown film machines.

[0003] Unlike other types of plastic bags, FIBCs have a thicker bag body, so the blowing pressure of FIBCs needs to be greater. However, as the FIBC is pulled upward, the outward expansion part of the bottom of the bag body is easily affected by high-pressure airflow and external environmental factors. Once the external environment is humid or high temperature, the excessively strong high-pressure airflow will cause wrinkles or certain deformations to appear at the bottom of the bag body in an instant. In severe cases, it can cause uneven thickness in some parts of the FIBC.

[0004] In view of this, a plastic bulk bag blown film machine was designed to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted in this invention is as follows:

[0007] A blown film machine for plastic container bags includes a blown film mechanism, a film body auxiliary pressure mechanism disposed within the blown film mechanism, a film diameter adjustment mechanism disposed within the film body auxiliary pressure mechanism, and a film supporting mechanism disposed within the film body auxiliary pressure mechanism. The blown film mechanism is used to cooperate with an extruder to blown film molten plastic granules. The film body auxiliary pressure mechanism includes a pressure-bearing base and an anti-detachment pad disposed at the bottom of the pressure-bearing base, and the pressure-bearing base has uniformly distributed grooves inside. The film diameter adjustment mechanism includes an outer support rod disposed inside the anti-detachment pad, multiple limiting suspensions disposed on the outer support rod, and an extended tie rod movably mounted on the outer support rod. The film supporting mechanism includes an inner support rod disposed inside the outer support rod, multiple inclined frames disposed on the inner support rod, multiple guide arc plates disposed on the inner support rod, and two baffles mounted on the inner side of the guide arc plates. The top end of the extended tie rod is movably mounted in the two baffles.

[0008] In a preferred embodiment, the present invention may be further configured such that: the membrane pressure-assisted mechanism further includes a base support disposed at the bottom of the pressure-bearing base, and the inner wall of the base support is provided with two sets of clamping plates;

[0009] Hydraulic components are installed inside both sets of clamping plates, and a load-bearing plate is installed at the bottom end of the hydraulic sub-rod inside the hydraulic components;

[0010] A housing is installed at the outer end of the load-bearing plate, and the bottom end of the outer support rod is installed at the other end of the load-bearing plate;

[0011] The chassis contains a motor and a screw mounted on the motor's internal drive shaft.

[0012] In a preferred embodiment, the present invention can be further configured such that: the limiting suspension has an overall U-shaped structure, and a first column is installed at the top of the limiting suspension;

[0013] A second column is provided on the inner side of the guide arc plate;

[0014] A resilient and stabilizing return spring is provided between the first column and the second column.

[0015] In a preferred embodiment, the present invention may be further configured such that the blown film mechanism includes an exhaust chamber, a plurality of air pipes disposed on the exhaust chamber, and a flow guide shroud disposed on the top port of the exhaust chamber;

[0016] The outer wall of the exhaust chamber is provided with a vertical groove, and a support plate is provided in the vertical groove, with the inner end of the support plate installed at the bottom of the base.

[0017] The outer wall of the exhaust chamber is fitted with a pad, and a lead screw is movably installed inside the pad;

[0018] The threaded section of the lead screw is adapted to pass through the threaded hole at the outer end of the support plate.

[0019] In a preferred embodiment, the present invention may be further configured such that: the anti-detachment pad has a through hole inside, and the screw is adapted to pass through the through hole, and the through hole is used to provide stabilization protection for the screw when it rises to the highest position.

[0020] In a preferred embodiment, the present invention may be further configured such that the membrane support mechanism further includes a clamp installed at the bottom end of the inner support rod, and the clamp has a hole for guiding the molten masterbatch inside.

[0021] In a preferred embodiment, the present invention can be further configured such that both the outer and inner support rods are T-shaped structures.

[0022] The outer support rod has a sliding groove on its tube wall;

[0023] The clamp is movably installed within the slide groove.

[0024] In a preferred embodiment, the invention may be further configured such that the limiting suspension is made of stainless steel and is used to provide effective limiting protection against the overturning of the extended tie rod.

[0025] In a preferred embodiment, the present invention can be further configured such that: a shaft is provided in the transverse holes at both the top and bottom ends of the extended tie rod, and a slot is opened inside the extended tie rod;

[0026] The inclined frame is adapted to penetrate into the slot inside the extended tie rod.

[0027] In a preferred embodiment, the present invention may be further configured such that the inner wall arc surface of the flow guide and the outer surface of the guide arc plate are both provided with a glaze layer with low frictional resistance.

[0028] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows:

[0029] 1. This invention adds a film diameter adjustment mechanism and a film support mechanism inside the existing blown film machine. When the molten masterbatch passes through the blown film machine and is drawn upward, the upwardly extending film support mechanism, together with the flow guide, guides the outward expansion of the bottom part of the container bag, thus preventing the container bag from wrinkling or deforming inward due to environmental factors and interference from high-pressure airflow.

[0030] 2. This invention sets the inclined frames as an inwardly curved arc structure. When multiple evenly distributed inclined frames expand outward, a constant angle thrust is applied to the bottom of the multiple inclined frames using a film diameter adjustment mechanism. The multiple inclined frames after angle adjustment provide internal support and protection for blown film processing of FIBCs with different inner diameters. Combined with air pressure and the film diameter adjustment mechanism, film materials of different diameters are forcibly shaped, thereby improving the blown film effect of FIBCs.

[0031] 3. This invention incorporates a freely lifting and lowering film auxiliary pressure mechanism inside an existing blown film machine. As the film auxiliary pressure mechanism is pulled upwards, the film diameter adjustment mechanism and film support mechanism within the auxiliary pressure mechanism, together with the flow guide, adjust the height of the bottom of the FIBC film material. Then, with the help of an external traction device, the film material is continuously pulled upwards, thereby preventing the bottom of the film from being squeezed before it hardens and reducing the breakage rate of the FIBC. Attached Figure Description

[0032] Figure 1 This is a schematic diagram illustrating the use of the present invention;

[0033] Figure 2 This is a schematic diagram of the blown film mechanism of the present invention;

[0034] Figure 3 This is a partial bottom view of the present invention;

[0035] Figure 4 This is a schematic diagram of the membrane pressure-assisted mechanism of the present invention;

[0036] Figure 5 For the present invention Figure 4 An explosion diagram;

[0037] Figure 6 This is a schematic diagram of the anti-detachment pad of the present invention;

[0038] Figure 7 This is a schematic diagram of the membrane support mechanism of the present invention;

[0039] Figure 8 For the present invention Figure 7 Enlarged view of point B in the middle;

[0040] Figure 9 For the present invention Figure 7 Enlarged view of point A in the middle;

[0041] Figure 10 This is a schematic diagram of the membrane diameter adjustment mechanism of the present invention;

[0042] Figure 11 For the present invention Figure 10 Enlarged view of point C in the middle;

[0043] Figure 12 For the present invention Figure 10 Enlarged diagram of point D in the middle.

[0044] Figure label:

[0045] 100. Film blowing mechanism; 110. Exhaust chamber; 120. Draft shield; 130. Air pipe; 140. Pad; 150. Lead screw; 160. Support plate;

[0046] 200. Membrane auxiliary pressure mechanism; 210. Pressure-bearing base; 220. Base support; 230. Anti-detachment pad; 240. Clamping plate; 250. Hydraulic component; 260. Load-bearing plate; 270. Chassis; 280. Motor; 290. Screw;

[0047] 300. Membrane diameter adjustment mechanism; 310. External support rod; 320. Limiting suspension; 330. Extended tie rod; 340. First column; 350. Return spring;

[0048] 400. Membrane support mechanism; 410. Inner support rod; 420. Clamping seat; 430. Inclined frame; 440. Guide arc plate; 450. Baffle; 460. Second column. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0050] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0051] The following describes, with reference to the accompanying drawings, some embodiments of a plastic container bag blown film machine provided by the present invention.

[0052] Example 1:

[0053] Combination Figures 1-12 As shown, the present invention provides a blown film machine for plastic container bags, including a blown film mechanism 100, a film body auxiliary pressure mechanism 200 disposed within the blown film mechanism 100, a film diameter adjustment mechanism 300 disposed within the film body auxiliary pressure mechanism 200, and a film support mechanism 400 disposed within the film body auxiliary pressure mechanism 200. The blown film mechanism 100 is used to blown film onto molten plastic particles, the film body auxiliary pressure mechanism 200 is used to provide height adjustment for the bottom of film materials with different diameters and widths, the film diameter adjustment mechanism 300 is used to provide further lateral bending adjustment for the film support mechanism 400, and the film support mechanism 400 is used to provide built-in mechanical support for the film material.

[0054] The blown film mechanism 100 is used in conjunction with an extruder to blow film molten plastic granules;

[0055] The membrane pressure mechanism 200 includes a pressure base 210 and an anti-detachment pad 230 disposed at the bottom of the pressure base 210, and the pressure base 210 has uniformly distributed grooves inside.

[0056] The membrane diameter adjustment mechanism 300 includes an outer support rod 310 disposed inside the anti-detachment pad 230, a plurality of limiting suspensions 320 disposed on the outer support rod 310, and an extension rod 330 movably mounted on the outer support rod 310.

[0057] The limiting suspension 320 has an overall U-shaped structure, and the first pillar 340 is installed at the top of the limiting suspension 320;

[0058] A second column 460 is provided on the inner side of the guide arc plate 440;

[0059] A resilient and stabilizing return spring 350 is provided between the first column 340 and the second column 460.

[0060] The film support mechanism 400 includes an inner support rod 410 disposed inside the outer support rod 310, a plurality of inclined frames 430 disposed on the inner support rod 410, a plurality of guide arc plates 440 disposed on the inner support rod 410, two baffles 450 installed on the inner side of the guide arc plates 440, and a clamp 420 installed at the bottom end of the inner support rod 410, and the clamp 420 has holes for guiding molten masterbatch inside.

[0061] The top of the extended tie rod 330 is movably mounted within the two baffles 450.

[0062] When in use, according to the blowing requirements of different diameter and width of the container bag, the top wheel of the screw 150 is pre-adjusted to rotate clockwise. At this time, the support plate 160 will drive the membrane auxiliary pressure mechanism 200 to rise gradually along the inner cavity of the exhaust chamber 110. At this time, the membrane auxiliary pressure mechanism 200 can be lifted up until the top of the pressure base 210 is exposed to the external environment.

[0063] After the height of the pressure base 210 is effectively adjusted, the hydraulic component 250 is operated. At this time, the hydraulic sub-rod inside the hydraulic component 250 will pull the load-bearing plate 260 and the machine box 270. The outer support rod 310 fixed inside the load-bearing plate 260 will be lifted upward under pressure. At this time, the multiple extended tie rods 330 set on the outer support rod 310 can work with the multiple return springs 350 to expand outward quickly. Finally, the membrane diameter adjustment mechanism 300 and the membrane support mechanism 400 can be steadily lifted. At this time, the multiple evenly distributed guide arc plates 440 will expand outward after being pressed until the multiple guide arc plates 440 work with the flow guide shroud 120 to provide an effective path for the blowing of the membrane material. This process can effectively avoid external environmental factors and excessive atmospheric pressure from causing wrinkles or deformation at the bottom of the membrane material.

[0064] When the motor 280 is running, its internal transmission shaft will drive the screw 290 to rotate. At this time, the clamp 420 will rise steadily along the outside of the screw 290. Finally, the inner support rod 410 can push the multiple inclined frames 430 outward to ensure that the bottom of the multiple guide arc plates 440 can provide effective inner protection for the blown film material.

[0065] Example 2:

[0066] Combination Figures 1-3 As shown, in the extrusion of Embodiment 1, the blown film mechanism 100 includes an exhaust chamber 110, a plurality of air pipes 130 disposed on the exhaust chamber 110, and a flow guide shroud 120 disposed on the top port of the exhaust chamber 110.

[0067] The outer wall of the exhaust chamber 110 is provided with a vertical groove, and a support plate 160 is provided in the vertical groove, and the inner end of the support plate 160 is installed at the bottom of the base 220.

[0068] A pad 140 is installed on the outer wall of the exhaust chamber 110, and a lead screw 150 is movably installed inside the pad 140.

[0069] The threaded section of the lead screw 150 is adapted to pass through the threaded hole at the outer end of the support plate 160;

[0070] The inner wall arc surface of the flow guide shroud 120 and the outer surface of the guide arc plate 440 are both provided with a glaze layer with low frictional resistance.

[0071] Preferably, the exterior of the exhaust chamber 110 is provided with a heat insulation coating. When the blown film mechanism 100 is used in conjunction with an external extruder, after the plastic particles are fed into the extruder, the masterbatch fed by the screw inside the extruder is transferred to the die head through the pipeline. As the molten masterbatch is extruded from the die head, under the blowing action of the annular air pressure, the masterbatch will expand upward along the inner side of the guide shroud 120, and finally form the coarse product of the container bag under the action of air pressure.

[0072] When external environmental factors change, in order to prevent the bottom of the blown film material from softening, the lead screw 150 is adjusted to drive the support plate 160 and the film body auxiliary pressure mechanism 200 to rise steadily, ultimately providing anti-breakage protection for the blown film material under different environmental factors.

[0073] Example 3:

[0074] Combination Figure 4 , Figure 5 as well as Figure 7 As shown, in the extrusion of Example 1, the film auxiliary pressure mechanism 200 also includes a bottom support 220 disposed at the bottom of the pressure base 210, and the inner wall of the bottom support 220 is provided with two sets of clamping plates 240.

[0075] Hydraulic components 250 are installed inside the two sets of clamping plates 240, and a load-bearing plate 260 is installed at the bottom end of the hydraulic sub-rod inside the hydraulic components 250.

[0076] A housing 270 is installed on the outer end of the load-bearing plate 260, and the bottom end of the outer support rod 310 is installed on the other end of the load-bearing plate 260.

[0077] Preferably, the base 220 is fixed to the bottom of the pressure base 210 by welding. When the membrane auxiliary pressure mechanism 200 is pulled by the support plate 160 and rises to the outside of the flow guide 120, the exposed end of the pressure base 210 can provide an effective expansion and contraction path for the evenly distributed multiple guide arc plates 440. As the evenly distributed multiple guide arc plates 440 expand outward, in conjunction with the pressure guidance of the flow guide 120, the blown membrane material can be stably stretched along the gap of the effective path.

[0078] The internal housing of the chassis 270 contains a motor 280 and a screw 290 mounted on the drive shaft inside the motor 280.

[0079] The anti-detachment pad 230 has a through hole inside, and the screw 290 is adapted to pass through the through hole. The through hole is used to provide stabilizing protection for the screw 290 when it rises to the highest position.

[0080] Preferably, the length of the screw 290 is half the length of the outer support rod 310, and the outer end of the clamp 420 is located outside the screw 290. When the motor 280 starts and runs, its internal transmission shaft will drive the screw 290, so that the inner support rod 410 constrained by the outer support rod 310 and the clamp 420 can be pressed and raised and lowered stably, which can ultimately ensure that the extended tie rod 330 and the inclined frame 430 remain stable.

[0081] Example 4:

[0082] Combination Figures 7-12As shown, in the above embodiment, both the outer support rod 310 and the inner support rod 410 have a T-shaped structure;

[0083] The outer strut 310 has a groove on its tube wall;

[0084] The clamp 420 is movably installed inside the slide groove;

[0085] The limiting suspension 320 is made of stainless steel and is used to provide effective limiting protection for the overturning of the extended tie rod 330.

[0086] The extended tie rod 330 has a shaft installed in the horizontal hole at both the top and bottom ends, and a slot is opened inside the extended tie rod 330.

[0087] The slant bracket 430 is adapted to fit through the slot inside the extended tie rod 330.

[0088] When the outer support rod 310 is pushed and rises into the anti-detachment pad 230, the multiple extended tie rods 330 movably installed at the top of the outer support rod 310 can cooperate with the interior of the pressure base 210 to extend stably. Combined with the multiple limiting suspensions 320 fixed at the top of the outer support rod 310 to limit and constrain the multiple extended tie rods 330, as the inner support rod 410 is pressed and rises further, the multiple inclined frames 430 movably installed at the top of the inner support rod 410 will further fine-tune the bottom of the multiple guide arc plates 440 after expansion, thereby enabling diameter and width control for the blowing of the film material.

[0089] The working principle and usage process of this invention: Plastic bulk bags are the most commonly used packaging materials. They require plastic particles to be melted, stretched, and blown into a film.

[0090] When plastic particles are fed into the machine's hopper, they enter the screw along the hopper and are continuously fed and propelled by the screw through melting, ultimately pushing the plastic particles forward.

[0091] Furthermore, during the transfer process, after the molten plastic masterbatch is filtered to remove impurities, it can be extruded from the die head. Finally, the extruded and filtered molten masterbatch can be delivered into the blown film machine. After being cooled and inflated by the air ring inside the blown film machine, the prototype of the plastic container bag can be initially made.

[0092] However, there are still some drawbacks to using blown film machines in conjunction with extruders. Because blown film machines need to be run in advance, after the molten plastic masterbatch is fed into the blown film machine, the masterbatch is pulled out from the inside of the blown film machine by the traction component. Finally, under the action of the air ring blowing, the molten masterbatch can be expanded outward by the air pressure, and finally form a bag structure. At the moment when the molten masterbatch is sprayed out of the blown film machine, the bottom of the masterbatch forming the bag structure is easily interfered with by the air pressure inside the blown film machine, which will cause the bag to expand and deform to a certain extent. In severe cases, it will cause wrinkles at the bottom of the bag before it has completely cooled and solidified.

[0093] The device incorporates a guide arc plate 440 inside an existing blown film machine, which provides multi-point mechanical expansion to the bottom of the bag. When the hydraulic component 250 is running, its internal hydraulic sub-rod pulls the load-bearing plate 260 and the machine box 270 to move up and down as a whole. At this time, the outer support rod 310 and the motor 280 move up and down synchronously. Meanwhile, multiple extended tie rods 330, which are set at the top of the outer support rod 310 and are evenly distributed, can expand outward under the limitation of multiple evenly distributed limit suspensions 320. At the same time, multiple evenly distributed return springs 350 push the guide arc plate 440 outward. Finally, the multiple guide arc plates 440 can form a funnel-shaped gap with the inner arc surface of the flow guide shroud 120. At this time, the multiple directional expansion guide arc plates 440 can form a parallel gap with the inner arc surface of the flow guide shroud 120 to effectively guide the blowing of the film.

[0094] When the blown film machine blows plastic masterbatch into film and is affected by surrounding environmental factors, the motor 280 runs. At this time, the transmission shaft inside the motor 280 can drive the screw 290, and the clamp 420 will rise and fall stably along the screw 290. Finally, the lifted clamp 420 and the inner support rod 410 will extend upward. At this time, the evenly distributed multiple inclined frames 430 will apply an outward pushing force to the bottom of multiple guide arc plates 440. At this time, the guide arc plates 440 can be tilted along the top of the extended tie rod 330 as the rotation axis. The tilting of the bottom of the guide arc plates 440 can work with the flow guide shroud 120 to provide an effective outward expansion guide path for the bottom of the film. The blown film forming a bag-like structure can avoid wrinkles or shrinkage due to multiple factors such as environmental factors and wind pressure.

[0095] By providing an effective path for blowing the membrane of FIBCs under different environmental factors, the efficient preparation of FIBCs can be improved.

[0096] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A plastic container bag blown film machine, comprising a blown film mechanism (100), characterized in that, It also includes a membrane auxiliary pressure mechanism (200) disposed in the blown film mechanism (100), a membrane diameter adjustment mechanism (300) disposed in the membrane auxiliary pressure mechanism (200), and a membrane support mechanism (400) disposed in the membrane auxiliary pressure mechanism (200). The blown film mechanism (100) is used in conjunction with the extruder to blow film molten plastic particles; The membrane auxiliary pressure mechanism (200) includes a pressure base (210) and an anti-detachment pad (230) disposed at the bottom of the pressure base (210). The pressure base (210) has uniformly distributed grooves inside. The membrane auxiliary pressure mechanism (200) also includes a bottom support (220) disposed at the bottom of the pressure base (210). The inner wall of the bottom support (220) is provided with two sets of clamping plates (240). Hydraulic components (250) are provided in the two sets of clamping plates (240), and a load-bearing plate (260) is installed at the bottom end of the hydraulic sub-rod in the hydraulic component (250). A housing (270) is installed at the outer end of the load-bearing plate (260); The chassis (270) is equipped with a motor (280) and a screw (290) mounted on the drive shaft inside the motor (280). The membrane diameter adjustment mechanism (300) includes an outer support rod (310) disposed inside the anti-detachment pad (230), the bottom end of the outer support rod (310) is installed on the other end of the load-bearing plate (260), a plurality of limiting suspensions (320) disposed on the outer support rod (310) and an extended tie rod (330) movably installed on the outer support rod (310), the limiting suspension (320) is U-shaped in general, and a first column (340) is installed at the top of the limiting suspension (320). The membrane support mechanism (400) includes an inner support rod (410) disposed inside the outer support rod (310), a plurality of inclined frames (430) disposed on the inner support rod (410), a plurality of guide arc plates (440) disposed on the inner support rod (410), and two baffles (450) installed on the inner side of the guide arc plates (440). The top end of the extended tie rod (330) is movably mounted within two baffles (450); A second column (460) is provided on the inner side of the guide arc plate (440). A resilient and stabilizing return spring (350) is provided between the first column (340) and the second column (460).

2. The plastic container bag blown film machine according to claim 1, characterized in that, The blown film mechanism (100) includes an exhaust chamber (110), a plurality of air pipes (130) disposed on the exhaust chamber (110), and a flow guide (120) disposed on the top port of the exhaust chamber (110). The outer wall of the exhaust chamber (110) is provided with a vertical groove, and a support plate (160) is provided in the vertical groove, and the inner end of the support plate (160) is installed at the bottom of the base (220); The outer wall of the exhaust chamber (110) is fitted with a pad (140), and a lead screw (150) is movably installed inside the pad (140). The threaded section of the lead screw (150) is adapted to pass through the threaded hole at the outer end of the support plate (160).

3. The plastic container bag blown film machine according to claim 1, characterized in that, The anti-detachment pad (230) has a through hole inside, and the screw (290) is adapted to pass through the through hole. The through hole is used to provide stabilization protection for the screw (290) when it rises to the highest position.

4. A plastic container bag blown film machine according to claim 1, characterized in that, The membrane support mechanism (400) also includes a clamp (420) installed at the bottom end of the inner support rod (410), and the clamp (420) has holes for guiding the molten masterbatch inside.

5. A plastic container bag blown film machine according to claim 4, characterized in that, Both the outer support rod (310) and the inner support rod (410) are T-shaped structures; The outer support rod (310) has a sliding groove on its tube wall; The clamp (420) is movably installed in the slide groove.

6. A plastic container bag blown film machine according to claim 1, characterized in that, The limiting suspension (320) is made of stainless steel and is used to provide effective limiting protection for the overturning of the extension rod (330).

7. A plastic container bag blown film machine according to claim 1, characterized in that, The extended tie rod (330) has a shaft in the transverse hole at both the top and bottom ends, and a slot is opened inside the extended tie rod (330); The inclined frame (430) is adapted to pass through the slot inside the extended tie rod (330).

8. A plastic container bag blown film machine according to claim 2, characterized in that, The inner wall arc surface of the flow guide (120) and the outer surface of the guide arc plate (440) are both provided with a glaze layer with low frictional resistance.

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