Plastic film stretching forming equipment and plastic film stretching forming method

Abstract

The invention relates to the technical field of stretching and forming equipment, and proposes plastic film stretching and forming equipment and a plastic film stretching and forming method. On the basis of ensuring the preparation of a basic single-layer plastic film, it can form the preparation of an inner-and-outer nested double-layer plastic film, and the matching inner-and-outer nested double-layer films form a connection and positioning molding, thereby ensuring the relative stability of the double-layer film structure, better practicality, and better use activity. The invention comprises a cooling device and a composite forming device, wherein the composite forming device comprises an inner air cylinder, an inner layer extrusion cylinder is arranged outside the inner air cylinder, an outer layer extrusion cylinder is arranged outside the inner layer extrusion cylinder, the inner layer extrusion cylinder and the outer layer extrusion cylinder cooperate with each other to form an outer layer extrusion cavity, the inner air cylinder and the inner layer extrusion cylinder cooperate with each other to form an inner layer extrusion cavity, the top height of the inner layer extrusion cylinder is lower than the top height of the outer layer extrusion cylinder, a center cylinder is rotatably connected inside the inner air cylinder, a linkage structure is installed on the inner air cylinder, and an outer ring frame is rotatably connected to the center cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of stretching and forming equipment, in particular to plastic film stretching and forming equipment and a plastic film stretching and forming method. Background Art

[0002] As we all know, in the national general packaging terminology (GB4122-83), sheet plastics with a thickness of less than 0.25 mm are generally called films. Plastic film stretching and forming equipment is mainly used to produce various plastic films. In order to facilitate the preparation and production of plastic films, we propose a plastic film stretching and forming equipment and a plastic film stretching and forming method.

[0003] After searching, the Chinese patent publication number CN117799150B discloses a plastic film stretching forming device and a plastic film stretching forming method, which are roughly described as comprising a frame, a side device, a first driving device and a heating device. The frame is provided with side devices on opposite sides, and each side device includes a fixing member. The first driving device is arranged on the frame and is respectively connected to the fixing members on both sides. The first driving device can drive the fixing members on both sides to move toward or away from each other. The heating device can heat the fixing members on both sides. The heating device can heat the two opposite side edges of the plastic film so that the two opposite side edges of the plastic film can be respectively bonded to the fixing members on both sides. When in use, the side edges of the plastic film and the corresponding fixing members can be fixedly connected by the colloid formed after the side edges of the plastic film are melted, such as This plastic film stretching and forming equipment does not need to have a self-locking function. The Chinese patent announcement number CN203957367U discloses a plastic film forming machine, which is roughly described as including a frame, an extruder, a film stretching mechanism, a feeding device, a cooling device, an edge material smoothing mechanism, a shearing device, a waste film recovery device and a loading and unloading mechanism. The feeding device, the cooling device, the edge material smoothing mechanism, the shearing device, the waste film recovery device and the loading and unloading mechanism are all installed on the frame. When it is in use, the raw material enters the feeding device, and the film is extruded onto the No. 1 roller through the extruder. The film is blown flat by the wind leveler at the No. 1 roller position. The flattened film is stretched by the film stretching mechanism and then enters the shearing device to be cut into multiple rolls of film. The waste film generated during the shearing process is recovered by the waste film recovery device, and the cut roll of film becomes a finished roll of film through the loading and unloading mechanism.

[0004] Although the above-mentioned existing technical solutions can all be used for plastic film forming operations, the former is a single plastic film stretching operation, and the latter covers the entire plastic film forming process. However, both are single-layer plastic film forming operations. Taking into account the use environment of the plastic film, in most cases, the internal and external environments of the plastic film are quite different when used. Therefore, in order to ensure the use effect of the plastic film, it is inevitable to comprehensively consider the raw material characteristics of the plastic film, and even to form a nested use of inner and outer double-layer films when necessary. For the preparation of inner and outer double-layer plastic films, the above-mentioned two technical solutions are difficult to achieve, and the compatibility of use needs to be further strengthened. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides plastic film stretching and forming equipment and a plastic film stretching and forming method, which can form the preparation of an inner-and-outer nested double-layer plastic film on the basis of ensuring the preparation of a basic single-layer plastic film, and the matching inner-and-outer nested double-layer film forms a connection and positioning molding, thereby ensuring the relative stability of the double-layer film structure, having better practicality and better use activity.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: plastic film stretching and molding equipment, including a cooling device and a composite molding device, the composite molding device including an inner air cylinder, an inner layer extrusion cylinder is arranged outside the inner air cylinder, an outer layer extrusion cylinder is arranged outside the inner layer extrusion cylinder, the inner layer extrusion cylinder and the outer layer extrusion cylinder cooperate with each other to form an outer layer extrusion cavity, the inner air cylinder and the inner layer extrusion cylinder cooperate with each other to form an inner layer extrusion cavity, the top height of the inner layer extrusion cylinder is lower than the top height of the outer layer extrusion cylinder, a center cylinder is rotatably connected inside the inner air cylinder, a linkage structure is installed on the inner air cylinder, an outer ring frame is rotatably connected on the center cylinder, the linkage structure is used for transmission movement between the outer ring frame and the inner air cylinder, and the center A wind transmission structure is installed on the core cylinder, and the wind transmission structure is driven by the auxiliary wind entering the inner wind cylinder. Multiple inner rotating cylinders are rotatably connected to the central cylinder, and multiple outer rotating cylinders are rotatably connected to the outer ring frame. An inner synchronous limit assembly matching the multiple inner rotating cylinders is installed in the central cylinder, and an outer synchronous limit assembly matching the multiple outer rotating cylinders is installed in the outer ring frame. Sliding frames are slidably connected to the multiple inner rotating cylinders and the multiple outer rotating cylinders, and elastic springs are fixedly connected in the multiple inner rotating cylinders and the multiple outer rotating cylinders, and the multiple elastic springs are respectively fixedly connected to the multiple sliding frames, and rolling wheels are rotatably connected in the multiple sliding frames. The cooling device is installed on the top end of the outer extrusion cylinder.

[0007] Preferably, the inner synchronous limit assembly and the outer synchronous limit assembly respectively include an inner synchronous gear ring and an outer synchronous gear ring, the inner center cylinder and the outer ring frame are respectively provided with an inner mounting ring cavity and an outer mounting ring cavity, the inner synchronous gear ring and the outer synchronous gear ring are respectively rotatably connected in the inner mounting ring cavity and the outer mounting ring cavity, the inner synchronous gear ring is meshed with a plurality of inner linkage gears, the plurality of inner linkage gears are respectively fixedly connected to the plurality of inner rotating cylinders, the outer synchronous gear ring is meshed with a plurality of outer linkage gears, and the plurality of outer linkage gears are respectively fixedly connected to the plurality of outer rotating cylinders, threaded openings are provided on the center cylinder and the outer ring frame, two of the threaded openings are respectively connected with the inner mounting ring cavity and the outer mounting ring cavity, positioning and clamping bolts are threadedly connected in the two threaded openings, the inner synchronous gear ring and the outer synchronous gear ring are both provided with friction clamping surfaces, and the two friction clamping surfaces are respectively matched with the two positioning and clamping bolts.

[0008] Preferably, the wind transmission structure includes a plurality of inclined air-inducing curved pipes and a plurality of air-inducing blades, a plurality of side through holes are opened on the side wall of the inner wind tube, the plurality of inclined air-inducing curved pipes are respectively fixedly connected in the plurality of side through holes, the plurality of air-inducing blades are all fixedly connected to the central tube, and the plurality of air-inducing blades are all provided with an inclination matching the inclined air-inducing curved pipes.

[0009] Preferably, an air balancing ring is arranged outside the outer extrusion cylinder, and a plurality of branch air ducts are connected inside the air balancing ring. The plurality of branch air ducts are respectively connected with a plurality of oblique air induced bends, and the inner extrusion cylinder and the outer extrusion cylinder are both provided with through holes matching the branch air ducts.

[0010] Preferably, the linkage structure includes a fixed ring frame, which is fixedly connected in the inner wind tube, and a mounting frame tube is fixedly connected to the fixed ring frame, and a transmission gear is rotatably connected in the mounting frame tube, and the transmission gear is meshed with a driving end gear and a driven end gear, the driving end gear is fixedly connected to the center tube, and the driven end gear is fixedly connected to the bottom end of the outer ring frame.

[0011] Preferably, the bottom end of the inner extrusion cylinder and the bottom end of the outer extrusion cylinder are respectively connected to an extending guide quick-connect pipe and a covering guide quick-connect pipe, the covering guide quick-connect pipe is provided with an extending port, the extending guide quick-connect pipe is fixedly connected in the extending port, and the bottom end of the extending guide quick-connect pipe and the bottom end of the covering guide quick-connect pipe are both fixedly connected with a quick-connect flange ring.

[0012] Preferably, a mounting plate is fixedly connected to the outer extrusion cylinder, the air equalizing ring is fixedly connected to the top of the mounting plate, and a plurality of round-head notches are provided on the mounting plate.

[0013] Preferably, the cooling device includes an air induced draft plate, which is fixedly connected to the outer extrusion cylinder, the top of the outer extrusion cylinder is fixedly connected to a sealing ring by a plurality of fixing bolts, a plurality of air inlets are arranged outside the outer extrusion cylinder, and an annular groove is arranged inside the air induced draft plate.

[0014] Preferably, a plurality of mounting planes are arranged on the outer side surface of the induced draft disc, a plurality of mounting planes are fixedly connected with mounting plates, a plurality of mounting plates are provided with entry holes, and a plurality of entry holes are fixedly connected with entry quick-connect pipes.

[0015] The plastic film stretching method of the plastic film stretching device comprises the following steps:

[0016] S1. Before use, the inner layer extrusion cavity is first connected to the raw material extruder for preparing the inner layer film of the inner and outer double-layer films, and the outer layer extrusion cavity is connected to the raw material extruder for preparing the outer layer film of the inner and outer double-layer films, and then the inner air duct is connected to the external wind supply device, and compressed gas can be supplied into the inner air duct through the external wind supply device, and finally the cooling device is connected to the external cooling air supply device to facilitate auxiliary cooling after the preparation of the inner and outer double-layer films;

[0017] S2, when preparing the inner and outer double-layer films, start the external wind feeding device, the cooling air feeding device, the raw material extruder of the outer film and the raw material extruder of the inner film, the raw material extruder of the outer film feeds the raw material for preparing the outer film into the outer extrusion cavity, and finally outputs it through the top of the outer extrusion cavity to form the outer film, and the raw material extruder of the inner film feeds the raw material for preparing the inner film into the inner extrusion cavity, and finally outputs it through the top of the inner extrusion cavity to form the inner film;

[0018] S3. When the external wind delivery device delivers gas into the inner wind cylinder, the wind transmission structure will form a rotation drive of the center cylinder in the inner wind cylinder, and the rotation of the inner wind cylinder will drive the multiple inner rotating cylinders to rotate synchronously. Under the transmission action of the linkage structure, the rotation of the center cylinder will realize the synchronous opposite rotation movement of the outer ring frame, so that the synchronous rotation of the multiple outer rotating cylinders can be realized, and the rotation direction of the multiple outer rotating cylinders is opposite to the rotation direction of the multiple inner rotating cylinders. The rotating inner rotating cylinder and the outer rotating cylinder will respectively realize the follow-up movement of the corresponding roller wheels. Under the action of the elastic spring, the roller wheel whose position changes will form an outward push and rolling relative to the inner membrane, so that a relative connection is formed between the inner membrane and the outer membrane;

[0019] S4. Since the top height of the inner extrusion cylinder is lower than the top height of the outer extrusion cylinder, the inner film leaves the inner extrusion cavity earlier than the outer film does. Therefore, when the rolling wheel contacts and rolls the inner film, the mutual adhesion between the two is small. However, the outer film rolled relative to the inner film has just left the outer extrusion cavity, so the outer film still has a certain degree of adhesion. In this way, the inner film and the outer film can be adhered and connected after being pressed by the rolling wheel.

[0020] Compared with the prior art, the present invention provides a plastic film stretching forming device and a plastic film stretching forming method, which have the following beneficial effects:

[0021] (1) In the present invention, through the design of the composite molding device, the matching plastic film forms a relative preparation device for two layers of film that are nested inside and outside, which can realize the relative synchronous molding preparation of two layers of plastic films with different materials, and has better practicality. Through the cooperation of the inner rotating cylinder, the outer rotating cylinder, the elastic spring, the sliding frame and the roller wheel, a connection positioning molding structure corresponding to the inner and outer nested double-layer film is formed, thereby ensuring the relative stability of the double-layer film structure.

[0022] (2) In the present invention, through the design of the wind power transmission structure, combined with the gas blown into the plastic film, a lever drive is formed to achieve the movement drive of the center tube, and under the transmission action of the linkage structure, the center tube and the outer ring frame form a synchronous opposite rotation movement, and finally the roller wheel installed on the inner rotating tube and the roller wheel installed on the outer rotating tube form a rolling movement in opposite directions, thereby achieving the connection and positioning between the inner and outer nested double-layer membranes.

[0023] (3) In the present invention, by equipping the inner synchronous limit assembly and the outer synchronous limit assembly, the synchronous rotation adjustment of multiple inner rotating cylinders and the synchronous rotation adjustment of multiple outer rotating cylinders can be realized respectively, so as to facilitate the adjustment of the inclination direction of multiple roller pressing wheels, and facilitate the adjustment and control of the rolling angle of the roller pressing wheel on the double-layer membrane nested inside and outside, and the use flexibility is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a partially cutaway three-dimensional structure of the present invention;

[0025] Figure 2 For the present invention Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0026] Figure 3 It is a partially cutaway three-dimensional structural schematic diagram of the cooperation of the inner air cylinder, the inner extruded cylinder and the outer extruded cylinder of the present invention;

[0027] Figure 4 For the present invention Figure 3 A schematic diagram of the local enlarged structure at B in the middle;

[0028] Figure 5 It is a partially cutaway three-dimensional structural schematic diagram of the cooperation of the inner wind tube, the central tube and the air induced blades of the present invention;

[0029] Figure 6 For the present invention Figure 5 A schematic diagram of the local enlarged structure at C in the middle;

[0030] Figure 7 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the exploded three-dimensional structure of the sealing ring, the induced draft plate and the mounting plate of the present invention;

[0032] Fig. 9 It is a schematic diagram of the exploded three-dimensional structure of the cooperation between the outwardly extending guide quick-connect pipe, the caged guide quick-connect pipe and the quick-connect flange ring of the present invention;

[0033] Fig.10 It is a schematic diagram of the overall three-dimensional structure of the present invention when viewed from above;

[0034] Fig.11 It is a schematic diagram of a three-dimensional structure of the outward extending guide quick-connect pipe, the covering guide quick-connect pipe and the quick-connect flange ring in an exploded bottom view;

[0035] Fig.12 It is a schematic diagram of the three-dimensional structure of the induced draft plate, the mounting plate and the cut-in quick-connect pipe of the present invention;

[0036] Fig.13 It is a partially cutaway three-dimensional structural schematic diagram of the mounting frame, transmission gear, drive end gear, etc. of the present invention;

[0037] Fig.14 It is a schematic diagram of the exploded three-dimensional structure of the outer rotating cylinder, the sliding frame and the elastic spring of the present invention;

[0038] Fig.15 It is a schematic diagram of the three-dimensional structure of the stepped cross section of the plastic film prepared by the present invention.

[0039] In the figure: 1, inner air cylinder; 2, inner extruded cylinder; 3, outer extruded cylinder; 4, inner extruded cavity; 5, outer extruded cavity; 6, center cylinder; 7, outer ring frame; 8, inner rotating cylinder; 9, outer rotating cylinder; 10, sliding frame; 11, elastic spring; 12, roller pressure wheel; 13, inner synchronous gear ring; 14, outer synchronous gear ring; 15, inner mounting ring cavity; 16, outer mounting ring cavity; 17, inner linkage gear; 18, outer linkage gear; 19, threaded mouth; 20, positioning and clamping bolt; 21, friction and clamping surface; 22, guide Wind-bent bend; 23. induced draft blades; 24. wind-equalizing ring; 25. branch air duct; 26. fixed ring frame; 27. mounting frame tube; 28. transmission gear; 29. ​​driving end gear; 30. driven end gear; 31. extended guide quick-connect pipe; 32. shrouded guide quick-connect pipe; 33. extended opening; 34. quick-connect flange ring; 35. mounting plate frame; 36. round head notch; 37. sealing ring; 38. air inlet; 39. ring groove; 40. induced draft plate; 41. mounting plane; 42. mounting plate; 43. cut-in quick-connect pipe. DETAILED DESCRIPTION

[0040] 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.

[0041] For examples, see Figure 1-Figure 15The plastic film stretching and molding equipment includes a cooling device and a composite molding device, wherein the composite molding device includes an inner air cylinder 1, an inner layer extrusion cylinder 2 is arranged outside the inner air cylinder 1, an outer layer extrusion cylinder 3 is arranged outside the inner layer extrusion cylinder 2, the inner layer extrusion cylinder 2 and the outer layer extrusion cylinder 3 cooperate with each other to form an outer layer extrusion cavity 5, the inner air cylinder 1 and the inner layer extrusion cylinder 2 cooperate with each other to form an inner layer extrusion cavity 4, the top height of the inner layer extrusion cylinder 2 is lower than the top height of the outer layer extrusion cylinder 3, through the design of the composite molding device, the matching plastic film forms an inner and outer two-layer film relative preparation device that is nested with each other, which can realize two layers of different materials. The relatively synchronous molding preparation of the layers of plastic film has better practicality. The inner wind tube 1 is rotatably connected with the center tube 6. The inner wind tube 1 is equipped with a linkage structure. The center tube 6 is rotatably connected with the outer ring frame 7. The linkage structure is used for the transmission movement between the outer ring frame 7 and the inner wind tube 1. The linkage structure includes a fixed ring frame 26. The fixed ring frame 26 is fixedly connected to the inner wind tube 1. The fixed ring frame 26 is fixedly connected to the mounting frame tube 27. The mounting frame tube 27 is rotatably connected with a transmission gear 28. The transmission gear 28 is meshed with a driving end gear 29 and a driven end gear 30. The driving end gear 29 is fixedly connected to the center tube 6. The driven end gear 30 is fixedly connected to the bottom end of the outer ring frame 7. Under the transmission action of the linkage structure, the center tube 6 and the outer ring frame 7 form a synchronous opposite rotation movement, and finally the roller wheel 12 installed on the inner rotating tube 8 and the roller wheel 12 installed on the outer rotating tube 9 form a rolling movement in opposite directions, so as to achieve the connection and positioning between the inner and outer nested double-layer membranes. A wind transmission structure is installed on the center tube 6. The wind transmission structure is driven by the auxiliary wind entering the inner wind tube 1. The wind transmission structure includes a plurality of inclined wind-inducing curved pipes 22 and a plurality of wind-inducing blades 23. A plurality of side through holes are opened on the side wall of the inner wind tube 1. A plurality of inclined draft pipes 22 are respectively fixedly connected in a plurality of side through holes, a plurality of draft blades 23 are all fixedly connected to the central tube 6, and the plurality of draft blades 23 are all provided with an inclination matching the inclined draft pipes 22, an air balancing ring 24 is provided outside the outer extruded tube 3, a plurality of branch air ducts 25 are connected inside the air balancing ring 24, and the plurality of branch air ducts 25 are respectively connected to the plurality of inclined draft pipes 22, and the inner extruded tube 2 and the outer extruded tube 3 are both provided with through holes matching the branch air ducts 25. Through the design of the wind transmission structure and the gas blown into the plastic film, a lever drive is formed to achieve the movement drive of the central tube 6.

[0042] It should be further explained that a plurality of inner rotating cylinders 8 are rotatably connected to the center cylinder 6, a plurality of outer rotating cylinders 9 are rotatably connected to the outer ring frame 7, an inner synchronous limit assembly matching the plurality of inner rotating cylinders 8 is installed in the center cylinder 6, an outer synchronous limit assembly matching the plurality of outer rotating cylinders 9 is installed in the outer ring frame 7, the inner synchronous limit assembly and the outer synchronous limit assembly respectively include an inner synchronous gear ring 13 and an outer synchronous gear ring 14, an inner mounting ring cavity 15 and an outer mounting ring cavity 16 are respectively provided in the center cylinder 6 and the outer ring frame 7, the inner synchronous gear ring 13 and the outer synchronous limit assembly respectively include an inner synchronous gear ring 13 and an outer synchronous gear ring 14, an inner mounting ring cavity 15 and an outer mounting ring cavity 16 are respectively provided in the center cylinder 6 and the outer ring frame 7, and the inner synchronous gear ring 13 and the outer synchronous limit assembly respectively include an inner synchronous gear ring 13 and an ... The step gear ring 14 is rotatably connected to the inner mounting ring cavity 15 and the outer mounting ring cavity 16 respectively. The inner synchronous gear ring 13 is meshedly connected with a plurality of inner linkage gears 17, and the plurality of inner linkage gears 17 are respectively fixedly connected to the plurality of inner rotating cylinders 8. The outer synchronous gear ring 14 is meshedly connected with a plurality of outer linkage gears 18, and the plurality of outer linkage gears 18 are respectively fixedly connected to the plurality of outer rotating cylinders 9. Threaded openings 19 are provided on the center cylinder 6 and the outer ring frame 7. The two threaded openings 19 are respectively connected to the inner mounting ring cavity 15 and the outer mounting ring cavity 16. The two threaded openings 19 are both threadedly connected with positioning clamping bolts 20, and the inner synchronous gear ring 13 and the outer synchronous gear ring 14 are both provided with friction clamping surfaces 21, and the two friction clamping surfaces 21 are matched with the two positioning clamping bolts 20 respectively. Through the configuration of the inner synchronous limit assembly and the outer synchronous limit assembly, the synchronous rotation adjustment of multiple inner rotating cylinders 8 and the synchronous rotation adjustment of multiple outer rotating cylinders 9 can be realized respectively, so as to facilitate the adjustment of the inclination direction of multiple roller pressing wheels 12, and then facilitate the adjustment and control of the rolling angle of the roller pressing wheel 12 on the double-layer membrane nested inside and outside, so that The utility model has good flexibility, and sliding frames 10 are slidably connected to the multiple inner rotating cylinders 8 and the multiple outer rotating cylinders 9, and elastic springs 11 are fixedly connected to the multiple inner rotating cylinders 8 and the multiple outer rotating cylinders 9, and the multiple elastic springs 11 are respectively fixedly connected to the multiple sliding frames 10, and the multiple sliding frames 10 are rotatably connected to the multiple sliding frames 10. Through the cooperation of the inner rotating cylinder 8, the outer rotating cylinder 9, the elastic springs 11, the sliding frames 10 and the roller wheels 12, a connection positioning molding structure corresponding to the inner and outer nested double-layer membranes is formed, thereby ensuring the relative stability of the double-layer membrane structure.

[0043] It should be further explained that the cooling device is installed at the top of the outer extrusion cylinder 3, and the cooling device includes an air induced draft plate 40, which is fixedly connected to the outer extrusion cylinder 3, and the top of the outer extrusion cylinder 3 is fixedly connected to a sealing ring 37 by a plurality of fixing bolts, and a plurality of air inlets 38 are arranged outside the outer extrusion cylinder 3, and an annular groove 39 is arranged inside the air induced draft plate 40, and a plurality of mounting planes 41 are arranged on the outer side of the air induced draft plate 40, and a plurality of mounting planes 41 are fixedly connected to mounting plates 42, and a plurality of mounting plates 42 are provided with cut-in holes, and a plurality of cut-in holes are fixedly connected to cut-in quick-connect pipes 43, so that the cooling air introduced by the cooling air introduction device surrounds the prepared inner and outer double-layer membranes to form inner and outer double-layer membranes. The outer extrusion cylinder 3 is fixedly connected to the outer extrusion cylinder 3 with a mounting plate 35, and the air balancing ring 24 is fixedly connected to the top of the mounting plate 35. A plurality of round head notches 36 are provided on the mounting plate 35, which are convenient for the fixed installation of the plastic film stretching molding equipment as a whole relative to the outside.

[0044] In summary, the plastic film stretching molding method of the plastic film stretching molding equipment includes the following steps: before use, the inner layer extrusion cavity 4 is first connected to the raw material extruder for preparing the inner layer film of the inner and outer double-layer films, and the outer layer extrusion cavity 5 is connected to the raw material extruder for preparing the outer layer film of the inner and outer double-layer films, and then the inner air duct 1 is connected to the external wind supply device, and compressed gas can be supplied into the inner air duct 1 through the external wind supply device, and finally the cooling device is connected to the external cooling air supply device to facilitate auxiliary cooling after the preparation of the inner and outer double-layer films is completed. The connection between the cooling device and the external cooling air supply device is achieved by cutting in the quick-connect pipe 43. Due to the tangential arrangement of the cut-in quick-connect pipe 43, the cooling air tangentially entering the induced draft plate 40 will form a swirling guide in the induced draft plate 40 and finally blown out in the annular groove 39, so that the cooling air forms an auxiliary cooling relative to the extruded inner and outer double-layer films. However, when preparing the inner and outer double-layer membranes, the external wind supply device, the cooling air supply device, the raw material extruder for the outer layer membrane and the raw material extruder for the inner layer membrane are started. The raw material extruder for the outer layer membrane supplies the raw material for preparing the outer layer membrane into the outer layer extrusion cavity 5, and finally outputs it through the top of the outer layer extrusion cavity 5 to form the outer layer membrane. The raw material extruder for the inner layer membrane supplies the raw material for preparing the inner layer membrane into the inner layer extrusion cavity 4, and finally outputs it through the top of the inner layer extrusion cavity 4 to form the inner layer membrane. When the external wind supply device supplies gas into the inner wind tube 1, the central tube 6 will be driven to rotate in the inner wind tube 1 due to the action of the wind transmission structure. The rotation of the inner wind tube 1 will drive multiple inner rotating tubes 8 to rotate synchronously. When the external wind supply device supplies gas into the inner wind tube 1, it will act on the induced draft vanes 23 through the sequential guidance of the branch air duct 25 and the induced draft oblique bend pipe 22, and the rotation of the central tube 6 is realized through the transmission of the induced draft vanes 23.

[0045] Furthermore, under the transmission action of the linkage structure, the rotation of the center cylinder 6 drives the driving end gear 29 to rotate, the rotation of the driving end gear 29 drives the driven end gear 30 to rotate through the transmission gear 28, and the rotation of the driven end gear 30 drives the outer ring frame 7 to rotate, and under the influence of the transmission direction of the driving end gear 29, the transmission gear 28 and the driven end gear 30, the rotation of the center cylinder 6 will realize the synchronous opposite rotation movement of the outer ring frame 7, so that the synchronous rotation of multiple outer rotating cylinders 9 can be realized, and the rotation direction of the multiple outer rotating cylinders 9 is opposite to the rotation direction of the multiple inner rotating cylinders 8, and the rotating inner rotating cylinders 8 and the outer rotating cylinders 9 will respectively realize the corresponding The rolling wheel 12 moves with the action of the elastic spring 11, and the rolling wheel 12 whose position changes will push and roll outward relative to the inner film, so that the inner film and the outer film are relatively connected. Since the top height of the inner extrusion cylinder 2 is lower than the top height of the outer extrusion cylinder 3, the time when the inner film leaves the inner extrusion cavity 4 is earlier than the time when the outer film leaves the outer extrusion cavity 5. Therefore, when the rolling wheel 12 forms contact and rolling operation with respect to the inner film, the mutual adhesion between the two is small, while the outer film that forms rolling contact with the inner film has just left the outer extrusion cavity 5, so the outer film still has a certain amount of adhesion. In this way, the inner film and the outer film can be bonded together after being pressed together by the roller pressing wheel 12. Since the inner film and the outer film need to be continuously pulled and moved during the synchronous preparation process to facilitate continuous preparation, the tilting direction of the roller pressing wheel 12 is adjusted in a targeted manner according to the pulling speed of the inner film and the outer film, so that the angle between the roller pressing wheel 12 and the synchronous moving direction of the inner film and the outer film can be adjusted to form a spiral spacing regulation of the bonding indentation between the inner film and the outer film. When the tilting direction of the roller pressing wheel 12 is adjusted, the two positioning clamping bolts 20 are first rotated so that the two positioning clamping bolts 20 act on the two friction clamping surfaces 21 respectively. The top pressure positioning fails, rotate any one of the inner rotating cylinders 8, and realize the synchronous rotation adjustment of multiple inner rotating cylinders 8 through the meshing transmission of the inner synchronous gear ring 13 and multiple inner linkage gears 17. Similarly, rotate any one of the outer rotating cylinders 9, and realize the synchronous rotation adjustment of multiple outer rotating cylinders 9 through the meshing transmission of the outer synchronous gear ring 14 and multiple outer linkage gears 18. After the rotation adjustment is completed, keep the rotation posture of the roller pressure wheel 12, rotate and adjust the two positioning clamping bolts 20, so that the two positioning clamping bolts 20 form relative auxiliary clamping with respect to the two friction clamping surfaces 21 again, so as to achieve the position limitation of the roller pressure wheel 12 after the adjustment is completed.

[0046] 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. Plastic film stretching and forming equipment, including a cooling device, characterized in that: The composite molding device also includes a composite molding device, the composite molding device including an inner wind tube (1), an inner layer extrusion tube (2) is arranged outside the inner wind tube (1), an outer layer extrusion tube (3) is arranged outside the inner layer extrusion tube (2), the inner layer extrusion tube (2) and the outer layer extrusion tube (3) cooperate with each other to form an outer layer extrusion cavity (5), the inner wind tube (1) and the inner layer extrusion tube (2) cooperate with each other to form an inner layer extrusion cavity (4), the top height of the inner layer extrusion tube (2) is lower than the top height of the outer layer extrusion tube (3), the inner wind tube (1) is rotatably connected with a center tube (6), the inner wind tube (1) is equipped with a linkage structure, the center tube (6) is rotatably connected with an outer ring frame (7), the linkage structure is used for transmission movement between the outer ring frame (7) and the inner wind tube (1), the center tube (6) is equipped with a wind transmission structure, the wind transmission structure The structure is driven by the auxiliary force of wind entering the inner wind cylinder (1); a plurality of inner rotating cylinders (8) are rotatably connected to the central cylinder (6); a plurality of outer rotating cylinders (9) are rotatably connected to the outer ring frame (7); an inner synchronous limit assembly matching the plurality of inner rotating cylinders (8) is installed in the central cylinder (6); an outer synchronous limit assembly matching the plurality of outer rotating cylinders (9) is installed in the outer ring frame (7); a sliding frame (10) is slidably connected to the plurality of inner rotating cylinders (8) and the plurality of outer rotating cylinders (9); elastic springs (11) are fixedly connected to the plurality of inner rotating cylinders (8) and the plurality of outer rotating cylinders (9); the plurality of elastic springs (11) are respectively fixedly connected to the plurality of sliding frames (10); a roller pressing wheel (12) is rotatably connected to the plurality of sliding frames (10); and the cooling device is installed at the top end of the outer layer extrusion cylinder (3); The linkage structure comprises a fixed ring frame (26), the fixed ring frame (26) being fixedly connected to the inner wind tube (1), a mounting frame tube (27) being fixedly connected to the fixed ring frame (26), a transmission gear (28) being rotatably connected to the mounting frame tube (27), the transmission gear (28) being meshed with a driving end gear (29) and a driven end gear (30), the driving end gear (29) being fixedly connected to the central tube (6), and the driven end gear (30) being fixedly connected to the bottom end of the outer ring frame (7); The wind transmission structure comprises a plurality of inclined air-inducing curved tubes (22) and a plurality of air-inducing blades (23); a plurality of side through holes are provided on the side wall of the inner air tube (1); the plurality of inclined air-inducing curved tubes (22) are respectively fixedly connected in the plurality of side through holes; the plurality of air-inducing blades (23) are all fixedly connected to the central tube (6); and the plurality of air-inducing blades (23) are all provided with an inclination matching that of the inclined air-inducing curved tubes (22).

2. The plastic film stretching and forming equipment according to claim 1, characterized in that: The inner synchronous limit assembly and the outer synchronous limit assembly respectively comprise an inner synchronous gear ring (13) and an outer synchronous gear ring (14); an inner mounting ring cavity (15) and an outer mounting ring cavity (16) are respectively provided in the center cylinder (6) and the outer ring frame (7); the inner synchronous gear ring (13) and the outer synchronous gear ring (14) are respectively rotatably connected in the inner mounting ring cavity (15) and the outer mounting ring cavity (16); the inner synchronous gear ring (13) is meshedly connected with a plurality of inner linkage gears (17); the plurality of inner linkage gears (17) are respectively fixedly connected to a plurality of inner rotating cylinders (8); and the outer synchronous gear ring (14) is meshedly connected with the inner mounting ring cavity (15) and the outer mounting ring cavity (16). A plurality of external linkage gears (18) are connected together, and the plurality of external linkage gears (18) are respectively fixedly connected to the plurality of external rotating cylinders (9). The center cylinder (6) and the outer ring frame (7) are both provided with threaded openings (19), and the two threaded openings (19) are respectively connected to the inner mounting ring cavity (15) and the outer mounting ring cavity (16), and the two threaded openings (19) are both threadedly connected with positioning clamping bolts (20), and the inner synchronous gear ring (13) and the outer synchronous gear ring (14) are both provided with friction clamping surfaces (21), and the two friction clamping surfaces (21) are respectively matched with the two positioning clamping bolts (20).

3. The plastic film stretching and forming equipment according to claim 2, characterized in that: An air distribution ring (24) is arranged outside the outer extrusion cylinder (3), and a plurality of branch air ducts (25) are connected inside the air distribution ring (24). The plurality of branch air ducts (25) are respectively connected to the plurality of inclined air induced curved ducts (22), and the inner extrusion cylinder (2) and the outer extrusion cylinder (3) are both provided with through holes matching the branch air ducts (25).

4. The plastic film stretching and forming equipment according to claim 3, characterized in that: The bottom end of the inner extrusion tube (2) and the bottom end of the outer extrusion tube (3) are respectively connected to an outwardly extending guide quick-connect pipe (31) and a shrouding guide quick-connect pipe (32); the shrouding guide quick-connect pipe (32) is provided with an outwardly extending opening (33); the outwardly extending guide quick-connect pipe (31) is fixedly connected in the outwardly extending opening (33); and the bottom ends of the outwardly extending guide quick-connect pipe (31) and the shrouding guide quick-connect pipe (32) are both fixedly connected to a quick-connect flange ring (34).

5. The plastic film stretching and forming equipment according to claim 4, characterized in that: The outer extrusion cylinder (3) is fixedly connected to a mounting plate frame (35), the air equalizing ring (24) is fixedly connected to the top of the mounting plate frame (35), and the mounting plate frame (35) is provided with a plurality of round-head notches (36).

6. The plastic film stretching and forming equipment according to claim 5, characterized in that: The cooling device comprises an air induced draft plate (40), the air induced draft plate (40) being fixedly connected to the outer extrusion cylinder (3), the top end of the outer extrusion cylinder (3) being fixedly connected to a sealing ring (37) via a plurality of fixing bolts, a plurality of air inlets (38) being arranged outside the outer extrusion cylinder (3), and an annular groove (39) being arranged inside the air induced draft plate (40).

7. The plastic film stretching and forming equipment according to claim 6, characterized in that: A plurality of mounting planes (41) are provided on the outer surface of the induced draft plate (40), a mounting plate (42) is fixedly connected to each of the plurality of mounting planes (41), a cut-in hole is opened on each of the plurality of mounting plates (42), and a cut-in quick-connect pipe (43) is fixedly connected to each of the plurality of cut-in holes.

8. A plastic film stretching method using a plastic film stretching device, characterized in that: The plastic film stretching and forming device according to any one of claims 1 to 7 is used, comprising the following steps: S1. Before use, the inner layer extrusion cavity (4) is first connected to the raw material extruder for preparing the inner layer film of the inner and outer double-layer films, and the outer layer extrusion cavity (5) is connected to the raw material extruder for preparing the outer layer film of the inner and outer double-layer films, and then the inner wind tube (1) is connected to the external wind supply device, and compressed gas can be supplied to the inner wind tube (1) through the external wind supply device, and finally the cooling device is connected to the external cooling air supply device to facilitate auxiliary cooling after the preparation of the inner and outer double-layer films; S2, when preparing the inner and outer double-layer films, start the external wind feeding device, the cooling air feeding device, the raw material extruder for the outer film and the raw material extruder for the inner film, the raw material extruder for the outer film feeds the raw material for preparing the outer film into the outer extrusion cavity (5), and finally outputs it through the top of the outer extrusion cavity (5) to form the outer film, and the raw material extruder for the inner film feeds the raw material for preparing the inner film into the inner extrusion cavity (4), and finally outputs it through the top of the inner extrusion cavity (4) to form the inner film; S3. When the external wind delivery device delivers gas into the inner wind tube (1), the wind transmission structure will form a rotation drive of the central tube (6) in the inner wind tube (1). The rotation of the inner wind tube (1) will drive the multiple inner rotating tubes (8) to rotate synchronously. Under the transmission action of the linkage structure, the rotation of the central tube (6) will realize the synchronous opposite rotation movement of the outer ring frame (7). In this way, the synchronous rotation of the multiple outer rotating tubes (9) can be realized, and the rotation direction of the multiple outer rotating tubes (9) is opposite to the rotation direction of the multiple inner rotating tubes (8). The rotating inner rotating tubes (8) and the outer rotating tubes (9) will respectively realize the follow-up movement of the corresponding roller wheels (12). Under the action of the elastic spring (11), the roller wheels (12) whose positions change will form an outward push and rolling relative to the inner film, so that a relative connection is formed between the inner film and the outer film; S4. Since the top height of the inner extrusion cylinder (2) is lower than the top height of the outer extrusion cylinder (3), the inner film leaves the inner extrusion cavity (4) earlier than the outer film leaves the outer extrusion cavity (5). Therefore, when the rolling wheel (12) contacts and rolls the inner film, the mutual adhesion between the two is small. However, the outer film rolled relative to the inner film has just left the outer extrusion cavity (5), so the outer film still has a certain degree of adhesion. In this way, the inner film and the outer film can be adhesively connected after being pressed by the rolling wheel (12).

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