Blow molding device based on multi-barrier composite plastic bottle and preparation method

Abstract

The invention discloses a blow molding device based on a multi-barrier composite plastic bottle and a preparation method, the blow molding device comprises a bottom plate, a blow molding mechanism and a mold opening and closing mechanism, a discharging mechanism is arranged on the right side of the mold opening and closing mechanism, and the discharging mechanism comprises a circulation driving assembly and a plurality of clamping and cutting assemblies; and the circulating driving assembly is used for driving the multiple clamping and cutting assemblies to circularly rotate between the blow molding mechanism and the mold opening and closing mechanism, and the top of the supporting frame is rotationally connected with a front synchronous wheel and a rear synchronous wheel through rotating rods. According to the blow molding device based on the multi-barrier composite plastic bottle and the preparation method, the multiple clamping and cutting-off assemblies are driven by the driving circulation assembly to circularly enter the position between the mold opening and closing mechanism and the blow molding mechanism, and extruded plastic is clamped through cooperation of the clamping and cutting-off assemblies; and after blow molding is completed, the plastic bottles are taken out and cut off at the discharging position, the operation continuity of blow molding and discharging is improved, and the working efficiency of the device is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic bottle production, in particular to a blow molding device and a preparation method based on a multi-barrier composite plastic bottle. Background Art

[0002] Plastic bottles are mainly made of materials such as polyethylene or polypropylene and added with a variety of organic solvents. Plastic bottles widely use polyester (PET), polyethylene (PE), and polypropylene (PP) as raw materials. After adding corresponding organic solvents, they are heated at high temperature and then blow molded, extruded, or injection molded through plastic molds to form plastic containers.

[0003] Reference patent publication number "CN220534902U" discloses a blow molding device for plastic bottles, including a table body and a blow molding device arranged above it, and also includes: two molds, the two molds are arranged above the table body, the two molds are relatively far away from each other and are equipped with connecting parts on one side, a mounting plate is arranged on the other side of the connecting part, two groups of limit parts are symmetrically installed on the side of the mounting plate close to the connecting part, a threaded rod is connected to the mounting plate, guide rods are connected to both sides of the mounting plate, and the connecting part is snap-connected with the connecting rod.

[0004] As shown in the above technology, plastic bottles are produced by blow molding. The raw materials are extruded by an extruder and made by a mold and blow molding. They are taken out after being made. However, the existing method of unloading is inconvenient and the production efficiency is low. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a blow molding device and a preparation method based on a multi-barrier composite plastic bottle, which solves the problem of low efficiency of the material feeding method of the existing blow molding device for plastic bottles.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a blow molding device based on a multi-barrier composite plastic bottle includes a bottom plate, a blow molding mechanism and a mold opening and closing mechanism, a material discharge mechanism is arranged on the right side of the mold opening and closing mechanism, and the material discharge mechanism includes a circulating drive component and a plurality of clamping and cutting components;

[0007] The circulating drive component is used to drive multiple clamping and cutting components to circulate and rotate between the blow molding mechanism and the opening and closing mold mechanism. The circulating drive component includes a support frame. The top of the support frame is rotatably connected to two front and rear synchronous wheels through a rotating rod. The two synchronous wheels are connected through a synchronous belt transmission, and the surface of the synchronous belt is fixedly connected with multiple connecting parts at equal distances. The multiple clamping and cutting components are respectively fixedly connected to the multiple connecting parts. The bottom of the support frame is provided with a cooling component, a reset component and an air supply component. The air supply component supplies air to the cooling component through a hose. The cooling component can move and blow air following the plastic bottle, and the air blown out by the cooling component cools the blow-molded plastic bottle. The reset component is used to reset the position of the cooling component.

[0008] Preferably, a controller is installed on the blow molding mechanism, and a plurality of infrared sensors are fixedly connected to the top of the support frame at equal distances, and the plurality of infrared sensors are installed along the moving trajectory of the connecting piece, and the infrared sensors are connected to the controller by wireless signal connection, and the infrared sensor is used to move and position the clamping and cutting assembly, and cooperate with the controller to control the clamping and cutting assembly to work in sections, and a driving motor is fixedly connected to the bottom of the support frame, and the output end of the driving motor is fixedly connected to the rear synchronous wheel.

[0009] The clamping and cutting assembly includes a fixed plate, the top of the support frame is fixedly connected to a track, and the fixed plate is slidably connected to the track, the top of the fixed plate is slidably connected to two front and rear first racks, and the top of the fixed plate is also slidably connected to two front and rear second racks, the top of the fixed plate is rotatably connected to two front and rear intermediate gears, and the fixed plate and the first rack on the same side are both meshed with the intermediate gears for transmission.

[0010] The left sides of the two first racks are fixedly connected with a first pull rod, the left sides of the two intermediate gears are fixedly connected with a second pull rod, the two first pull rods and one end of the two first pull rods are fixedly connected with a tool holder, the surface of the first pull rod is slidably connected with two left and right clamping plates, a limiting spring is fixedly connected between the same side clamping plate and the tool holder, and the limiting spring is sleeved on the outside of the first pull rod, and a cutting knife is fixedly installed on the opposite side of the two tool holders, and an electric push rod is fixedly connected to the top of the fixed plate, and the telescopic end of the electric push rod is fixedly connected to the two second racks through a connecting rod.

[0011] The cooling assembly includes an arc-shaped groove opened at the bottom of the support frame, the inner surface of the arc-shaped groove is slidably connected to a moving block, the bottom of the moving block is fixedly connected to an air pipe, and the surface of the air pipe is fixedly connected to multiple nozzles at equal distances from top to bottom, and the bottom of the moving block is fixedly connected to a baffle rod.

[0012] The rotating rod in the front passes through the support frame and extends to one end below the support frame and is fixedly connected to a rotating plate. A sliding groove is opened inside the rotating plate, and a push rod is slidably connected to the inner surface of the sliding groove. A first return spring is fixedly connected between the push rod and the inner wall of the sliding groove. The sliding groove rotates and contacts the blocking rod to push the air pipe to move with the plastic bottle.

[0013] The reset assembly includes a rotating seat, which is fixedly connected to the bottom of the moving block, a rotating block is rotatably connected to the rotating seat, a damper is rotatably connected to the bottom of the support frame, the telescopic end of the damper is fixedly connected to the rotating block, a second reset spring is fixedly connected between the damper and the rotating block, and the second reset spring is sleeved on the surface of the telescopic rod of the damper.

[0014] The present invention also discloses a blow molding device and a preparation method based on a multi-barrier composite plastic bottle, which specifically comprises the following steps:

[0015] Step 1: Raw material selection and ratio:

[0016] Outer layer substrate: weather-resistant material, melt index 25-35g / 10min, accounting for 50%-60%;

[0017] Barrier layer: Ethylene-vinyl alcohol copolymer or nylon, accounting for 15%-20%, needs to be pre-dried to humidity <100ppm;

[0018] Adhesive layer: maleic anhydride grafted polyolefin, melt index 3-5g / 10min, accounting for 20%-25%.

[0019] Step 2: Drying treatment: The ethylene-vinyl alcohol copolymer barrier layer is treated in a vacuum drying oven at 60-80°C for 4-6 hours, and the humidity is controlled to be less than 50ppm. The weather-resistant material is dried in hot air circulation at 150°C for 3 hours to avoid hydrolysis and degradation;

[0020] Step 2: Multi-layer co-extrusion parison molding: Five-layer structure co-extrusion process: Die temperature gradient control: outer layer temperature is controlled at 230-240℃, bonding layer temperature is controlled at 210-220℃, barrier layer temperature is controlled at 190-200℃, bonding layer temperature is controlled at 210-220℃, inner layer temperature is controlled at 225-235℃, spiral split die is used to ensure that the thickness uniformity error of each layer is less than ±3%;

[0021] Step 3: Stretch Blow Molding:

[0022] Longitudinal stretching: The mechanical pull rod stretches at a speed of 15-20mm / s, and the stretching ratio is 2.0-2.5;

[0023] High-pressure inflation: Inflation is divided into two stages, with the pre-blowing pressure of 0.6-0.8MPa maintained for 2-3s and the final blowing pressure of 2.0-2.5MPa maintained for 6-8s.

[0024] Step 4: Cooling is performed by cooling water in the opening and closing molds, and cooling is performed by cooling components after the molds are opened.

[0025] Beneficial Effects

[0026] The present invention provides a blow molding device and a preparation method based on a multi-barrier composite plastic bottle. Compared with the prior art, it has the following beneficial effects:

[0027] 1. The blow molding device and preparation method based on multi-barrier composite plastic bottles drives multiple clamping and cutting components to circulate between the opening and closing mold mechanism and the blow molding mechanism through a driving circulation component, and clamps the extruded plastic through the cooperation of the clamping and cutting components. After the blow molding is completed, the plastic bottle is taken out and cut off at the unloading position, the operation continuity of blow molding and unloading is increased, and the working efficiency of the device is greatly improved.

[0028] 2. The blow molding device and preparation method based on multi-barrier composite plastic bottles cools the plastic bottles after blow molding by cooperating with the cooling component and the air supply component, and cooperates with the unloading mechanism to complete cooling while unloading, further improving the working efficiency of the device.

[0029] 3. The blow molding device and preparation method based on the multi-barrier composite plastic bottle, by setting an infrared sensor on the top of the support frame, the sensor is installed along the movement trajectory of the clamping and cutting component, so that the clamping and cutting component can be accurately positioned at the corresponding position and complete the clamping and cutting operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the appearance of the present invention;

[0031] Figure 2 It is a schematic diagram of the material unloading mechanism of the present invention;

[0032] Figure 3 is a schematic diagram of a circulating drive assembly of the present invention;

[0033] Figure 4 It is a schematic diagram of the clamping and cutting assembly of the present invention;

[0034] Figure 5 It is a schematic diagram of the cooling component and the resetting component of the present invention;

[0035] Figure 6 It is an enlarged schematic diagram of point A of the present invention.

[0036] In the figure: 1, bottom plate; 2, blow molding mechanism; 3, mold opening and closing mechanism; 4, circulation drive assembly; 41, support frame; 42, synchronous wheel; 43, connecting piece; 44, infrared sensor; 45, drive motor; 5, clamping and cutting assembly; 51, fixed plate; 52, first rack; 53, second rack; 54, intermediate gear; 55, first pull rod; 56, second pull rod; 57, clamping plate; 58, knife holder; 59, cutter; 510, limit spring; 511, electric push rod; 6, cooling assembly; 61, arc groove; 62, moving block; 63, air pipe; 64, nozzle; 65, stop rod; 66, rotating plate; 67, slide groove; 68, push rod; 69, first reset spring; 7, reset assembly; 71, rotating seat; 72, rotating block; 73, damper; 74, second reset spring; 8, air supply assembly; 9, controller. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-Figure 6 The blow molding device based on multi-barrier composite plastic bottles provides two technical solutions:

[0039] The first embodiment comprises a bottom plate 1, a blow molding mechanism 2 and a mold opening and closing mechanism 3. A material discharge mechanism is arranged on the right side of the mold opening and closing mechanism 3. The material discharge mechanism comprises a circulation drive component 4 and a plurality of clamping and cutting components 5.

[0040] The circulating drive component 4 is used to drive multiple clamping and cutting components 5 to circulate and rotate between the blow molding mechanism 2 and the opening and closing mold mechanism 3. The circulating drive component 4 includes a support frame 41. The top of the support frame 41 is rotatably connected to two front and rear synchronous wheels 42 through a rotating rod. The two synchronous wheels 42 are connected through a synchronous belt transmission, and the surface of the synchronous belt is equidistantly fixedly connected with multiple connecting parts 43. The multiple clamping and cutting components 5 are respectively fixedly connected to the multiple connecting parts 43. The bottom of the support frame 41 is provided with a cooling component 6, a reset component 7 and an air supply component 8. The air supply component 8 supplies air to the cooling component 6 through a hose. The cooling component 6 can move and blow air following the plastic bottle, and the air blown out by the cooling component 6 cools the blow-molded plastic bottle. The reset component 7 is used to reset the position of the cooling component 6.

[0041] A controller 9 is installed on the blow molding mechanism 2, and a plurality of infrared sensors 44 are fixedly connected to the top of the support frame 41 at equal distances, and the plurality of infrared sensors 44 are installed along the moving trajectory of the connecting piece 43. The infrared sensor 44 is connected to the controller 9 by wireless signal. The infrared sensor 44 is used to move and position the clamping and cutting assembly 5, and cooperates with the controller 9 to control the clamping and cutting assembly 5 to work in sections. A driving motor 45 is fixedly connected to the bottom of the support frame 41, and the output end of the driving motor 45 is fixedly connected to the rear synchronous wheel 42.

[0042] The clamping and cutting assembly 5 includes a fixed plate 51, the top of the support frame 41 is fixedly connected to a track, and the fixed plate 51 is slidably connected to the track, the top of the fixed plate 51 is slidably connected to two front and rear first racks 52, and the top of the fixed plate 51 is also slidably connected to two front and rear second racks 53, the top of the fixed plate 51 is rotatably connected to two front and rear intermediate gears 54, the same side fixed plate 51 and the first rack 52 are meshed with the intermediate gear 54 for transmission, the left sides of the two first racks 52 are fixedly connected to the first pull rod 55, and the left sides of the two intermediate gears 54 are fixed A second pull rod 56 is connected, and the two first pull rods 55 and one end of the two first pull rods 55 are fixedly connected to a tool holder 58. The surface of the first pull rod 55 is slidably connected to two left and right clamps 57. A limit spring 510 is fixedly connected between the same side clamp 57 and the tool holder 58, and the limit spring 510 is sleeved on the outside of the first pull rod 55. A cutter 59 is fixedly installed on the opposite side of the two tool holders 58. An electric push rod 511 is fixedly connected to the top of the fixed plate 51, and the telescopic end of the electric push rod 511 is fixedly connected to the two second racks 53 through a connecting rod.

[0043] By driving the circulation component 4, multiple clamping and cutting components 5 are driven to circulate between the opening and closing mold mechanism 3 and the blow molding mechanism 2, and the extruded plastic is clamped by the cooperation of the clamping and cutting components 5. After the blow molding is completed, the plastic bottle is taken out and cut at the unloading position. The continuity of the blow molding and unloading operations is increased, which greatly improves the working efficiency of the device. By arranging an infrared sensor 44 on the top of the support frame 41, the infrared sensor 44 is installed along the movement trajectory of the clamping and cutting component 5, so that the clamping and cutting component 5 can be accurately positioned at the corresponding position and complete the clamping and cutting operations.

[0044] The second embodiment is mainly different from the first embodiment in that: the cooling component 6 includes an arc groove 61 opened at the bottom of the support frame 41, and the inner surface of the arc groove 61 is slidably connected with a moving block 62, the bottom of the moving block 62 is fixedly connected with an air pipe 63, and the surface of the air pipe 63 is fixedly connected with a plurality of nozzles 64 at equal distances from top to bottom, and the bottom of the moving block 62 is fixedly connected with a blocking rod 65, and the front rotating rod passes through the support frame 41 and extends to one end below the support frame 41 and is fixedly connected with a rotating plate 66, a sliding groove 67 is opened inside the rotating plate 66, and a push rod 68 is slidably connected to the inner surface of the sliding groove 67, and a first return spring 69 is fixedly connected between the push rod 68 and the inner wall of the sliding groove 67, and the sliding groove 67 rotates to contact the blocking rod 65 to push the air pipe 63 to follow the movement of the plastic bottle.

[0045] The reset assembly 7 includes a rotating seat 71, which is fixedly connected to the bottom of the moving block 62. The rotating seat 71 is rotatably connected to a rotating block 72. The bottom of the support frame 41 is rotatably connected to a damper 73. The telescopic end of the damper 73 is fixedly connected to the rotating block 72. A second reset spring 74 is fixedly connected between the damper 73 and the rotating block 72, and the second reset spring 74 is sleeved on the surface of the telescopic rod of the damper 73.

[0046] The blow-molded plastic bottles are cooled by blowing through the cooperation of the cooling assembly 6 and the air supply assembly 8, and the cooling is completed while the bottles are being unloaded through the cooperation of the unloading mechanism, thereby further improving the working efficiency of the device.

[0047] During use: the outer blank is extruded through the blow molding mechanism 2, the mold opening and closing mechanism 3 closes the mold, and the blow molding operation is performed. After the blow molding is completed, the electric push rod 511 is started, and the electric push rod 511 pushes the two second racks 53 and the second pull rod 56 to move. The second rack 53 moves and transmits the first rack 52 through the intermediate gear 54. At this time, the two clamping plates 57 approach each other, and then clamp the outer blank. The mold opening and closing mechanism 3 opens the mold, and starts the drive motor 45 to rotate the synchronous wheel 42, and transmits the two synchronous wheels 42 to rotate through the connecting member 43. At this time, the connecting member 43 moves and drives the clamping and cutting component 5 to move, so as to bring out the blow-molded plastic bottle. When the infrared sensor 44 detects that the next clamping and cutting component 5 enters between the blow molding mechanism 2 and the mold opening and closing mechanism 3, the drive motor 45 stops rotating and starts the air supply component 8 at the same time. The air supply Component 8 supplies air to the air pipe 63 and blows it toward the plastic bottle through the nozzle 64 for cooling. After the next plastic is blown, the drive motor 45 is started again. At this time, the first blown plastic bottle moves. At the same time, the push rod 68 contacts the baffle 65 and pushes the air pipe 63 to move, thereby following the movement of the plastic bottle. At the end of the stroke, the push rod 68 passes the position of the baffle 65 under the action of the slide groove 67. At this time, the air pipe 63 is reset under the action of the second reset spring 74. At the same time, the air pipe 63 is slowly reset under the action of the damper 73, thereby blowing air to cool the second plastic bottle. This cycle repeats. When the first plastic bottle enters the unloading position, the electric push rod 511 is started again and pushed forward a certain distance. At this time, the knife holder 58 moves and causes the cutter 59 to cut off the clamping part of the plastic bottle to complete the unloading.

[0048] The present invention also discloses a preparation method based on a multi-barrier composite plastic bottle, which specifically comprises the following steps:

[0049] Step 1: Raw material selection and ratio:

[0050] Outer layer substrate: weather-resistant material, melt index 25-35g / 10min, accounting for 50%-60%;

[0051] Barrier layer: Ethylene-vinyl alcohol copolymer or nylon, accounting for 15%-20%, needs to be pre-dried to humidity <100ppm;

[0052] Adhesive layer: maleic anhydride grafted polyolefin, melt index 3-5g / 10min, accounting for 20%-25%.

[0053] Step 2: Drying treatment: The ethylene-vinyl alcohol copolymer barrier layer is treated in a vacuum drying oven at 60-80°C for 4-6 hours, and the humidity is controlled to be less than 50ppm. The weather-resistant material is dried in hot air circulation at 150°C for 3 hours to avoid hydrolysis and degradation;

[0054] Step 2: Multi-layer co-extrusion parison molding: Five-layer structure co-extrusion process: Die temperature gradient control: outer layer temperature is controlled at 230-240℃, bonding layer temperature is controlled at 210-220℃, barrier layer temperature is controlled at 190-200℃, bonding layer temperature is controlled at 210-220℃, inner layer temperature is controlled at 225-235℃, spiral split die is used to ensure that the thickness uniformity error of each layer is less than ±3%;

[0055] Step 3: Stretch Blow Molding:

[0056] Longitudinal stretching: The mechanical pull rod stretches at a speed of 15-20mm / s, and the stretching ratio is 2.0-2.5;

[0057] High-pressure inflation: Inflation is divided into two stages, with the pre-blowing pressure of 0.6-0.8MPa maintained for 2-3s and the final blowing pressure of 2.0-2.5MPa maintained for 6-8s.

[0058] Step 4: Cooling is performed by cooling water in the opening and closing molds, and cooling is performed by cooling components after the molds are opened.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blow molding device based on a multi-barrier composite plastic bottle, comprising a base plate (1), a blow molding mechanism (2) and a mold opening and closing mechanism (3), characterized in that: A material discharge mechanism is arranged on the right side of the mold opening and closing mechanism (3), and the material discharge mechanism comprises a circulation drive component (4) and a plurality of clamping and cutting components (5); The circulating drive component (4) is used to drive the plurality of clamping and cutting components (5) to cyclically rotate between the blow molding mechanism (2) and the mold opening and closing mechanism (3). The circulating drive component (4) comprises a support frame (41). The top of the support frame (41) is rotatably connected to two front and rear synchronous wheels (42) via a rotating rod. The two synchronous wheels (42) are connected via a synchronous belt transmission, and the surface of the synchronous belt is fixedly connected with a plurality of connecting pieces (43) at equal distances. The plurality of clamping and cutting components (5) are respectively fixedly connected to the plurality of connecting pieces (43). The bottom of the support frame (41) is provided with a cooling component (6), a reset component (7) and an air supply component (8). The air supply component (8) supplies air to the cooling component (6) via a hose. The cooling component (6) can move and blow air following the plastic bottle, and the air blown by the cooling component (6) cools the blow-molded plastic bottle. The reset component (7) is used to reset the position of the cooling component (6).

2. The blow molding device based on the multi-barrier composite plastic bottle according to claim 1 is characterized in that: A controller (9) is installed on the blow molding mechanism (2); a plurality of infrared sensors (44) are fixedly connected to the top of the support frame (41) at equal distances, and the plurality of infrared sensors (44) are installed along the moving track of the connecting member (43); the infrared sensors (44) are connected to the controller (9) by wireless signal transmission; the infrared sensors (44) are used to move and position the clamping and cutting assembly (5), and cooperate with the controller (9) to control the clamping and cutting assembly (5) to work in sections; a driving motor (45) is fixedly connected to the bottom of the support frame (41); and the output end of the driving motor (45) is fixedly connected to the rear synchronous wheel (42).

3. The blow molding device based on the multi-barrier composite plastic bottle according to claim 1 is characterized in that: The clamping and cutting assembly (5) comprises a fixed plate (51), the top of the support frame (41) is fixedly connected to a track, and the fixed plate (51) is slidably connected to the track, the top of the fixed plate (51) is slidably connected to two front and rear first racks (52), and the top of the fixed plate (51) is also slidably connected to two front and rear second racks (53), the top of the fixed plate (51) is rotatably connected to two front and rear middle gears (54), and the fixed plate (51) and the first rack (52) on the same side are both meshed with the middle gear (54) for transmission.

4. The blow molding device based on the multi-barrier composite plastic bottle according to claim 3 is characterized in that: The left sides of the two first racks (52) are fixedly connected with a first pull rod (55), the left sides of the two intermediate gears (54) are fixedly connected with a second pull rod (56), the two first pull rods (55) and one end of the two first pull rods (55) are fixedly connected with a tool holder (58), the surface of the first pull rod (55) is slidably connected with two left and right clamping plates (57), a limit spring (510) is fixedly connected between the same side clamping plate (57) and the tool holder (58), and the limit spring (510) is sleeved on the outside of the first pull rod (55), and a cutter (59) is fixedly installed on the opposite side of the two tool holders (58), and the top of the fixed plate (51) is fixedly connected with an electric push rod (511), and the telescopic end of the electric push rod (511) is fixedly connected to the two second racks (53) through a connecting rod.

5. The blow molding device based on the multi-barrier composite plastic bottle according to claim 1, characterized in that: The cooling assembly (6) includes an arc-shaped groove (61) opened at the bottom of the support frame (41), the inner surface of the arc-shaped groove (61) is slidably connected to a moving block (62), the bottom of the moving block (62) is fixedly connected to an air pipe (63), and the surface of the air pipe (63) is fixedly connected to a plurality of nozzles (64) at equal distances from top to bottom, and the bottom of the moving block (62) is fixedly connected to a blocking rod (65).

6. The blow molding device based on the multi-barrier composite plastic bottle according to claim 1, characterized in that: The front rotating rod passes through the support frame (41) and extends to one end below the support frame (41) and is fixedly connected to a rotating plate (66). A sliding groove (67) is provided inside the rotating plate (66), and a push rod (68) is slidably connected to the inner surface of the sliding groove (67). A first return spring (69) is fixedly connected between the push rod (68) and the inner wall of the sliding groove (67). The sliding groove (67) rotates to contact the blocking rod (65) to push the air pipe (63) to move with the plastic bottle.

7. The blow molding device based on the multi-barrier composite plastic bottle according to claim 1, characterized in that: The reset assembly (7) comprises a rotating seat (71), the rotating seat (71) is fixedly connected to the bottom of the moving block (62), a rotating block (72) is rotatably connected to the rotating seat (71), a damper (73) is rotatably connected to the bottom of the support frame (41), a telescopic end of the damper (73) is fixedly connected to the rotating block (72), a second reset spring (74) is fixedly connected between the damper (73) and the rotating block (72), and the second reset spring (74) is sleeved on the surface of the telescopic rod of the damper (73).

8. The method for preparing a multi-barrier composite plastic bottle according to claims 1 to 7 is characterized in that: The specific steps include: Step 1: Raw material selection and ratio: Outer layer substrate: weather-resistant material, melt index 25-35g / 10min, accounting for 50%-60%; Barrier layer: Ethylene-vinyl alcohol copolymer or nylon, accounting for 15%-20%, needs to be pre-dried to humidity <100ppm; Adhesive layer: maleic anhydride grafted polyolefin, melt index 3-5g / 10min, accounting for 20%-25%. Step 2: Drying treatment: The ethylene-vinyl alcohol copolymer barrier layer is treated in a vacuum drying oven at 60-80°C for 4-6 hours, and the humidity is controlled to be less than 50ppm. The weather-resistant material is dried in hot air circulation at 150°C for 3 hours to avoid hydrolysis and degradation; Step 2: Multi-layer co-extrusion parison molding: Five-layer structure co-extrusion process: Die temperature gradient control: outer layer temperature is controlled at 230-240℃, bonding layer temperature is controlled at 210-220℃, barrier layer temperature is controlled at 190-200℃, bonding layer temperature is controlled at 210-220℃, inner layer temperature is controlled at 225-235℃, spiral split die is used to ensure that the thickness uniformity error of each layer is less than ±3%; Step 3: Stretch Blow Molding: Longitudinal stretching: The mechanical pull rod stretches at a speed of 15-20mm / s, and the stretching ratio is 2.0-2.5; High-pressure inflation: Inflation is divided into two stages, with the pre-blowing pressure of 0.6-0.8MPa maintained for 2-3s and the final blowing pressure of 2.0-2.5MPa maintained for 6-8s. Step 4: Cooling is performed by cooling water in the opening and closing molds, and cooling is performed by cooling components after the molds are opened.

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