Three-layer co-extrusion blown film machine using plastic

Abstract

The application relates to the field of plastic recycling and reusing, and discloses a three-layer co-extrusion blown film machine for plastic film blowing, which comprises a co-extrusion die head, a film pulling assembly and an output component. The film pulling assembly comprises a sealing shell, the upper surface of the sealing shell is provided with a telescopic rod, the upper end of the telescopic rod is provided with an air outlet head after penetrating through the co-extrusion die head, the side surface and the upper surface of the air outlet head are both provided with a plurality of air outlet holes, a rotating shaft is rotatably arranged in the sealing shell and is provided with a coil spring at the arrangement position, the outer portion of the rotating shaft is provided with a winding reel, one end of the rotating shaft is provided with a connecting groove, a hose is arranged in the telescopic rod, one end of the hose is provided with a fixed step and is connected with the upper end of the telescopic rod, the other end of the hose is connected with the rotating shaft after winding around the winding reel, the rotating shaft is provided with a fixing hole for realizing the communication between the connecting groove and the hose, the outer circular surface of the sealing shell is provided with a first connecting nozzle and a second connecting nozzle, and the two ends of the first connecting nozzle and the second connecting nozzle are respectively provided with one air pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plastic recycling, in particular to a three-layer co-extrusion blown film machine for plastic film blowing. BACKGROUND

[0002] The three-layer co-extrusion blown film machine is a high-efficiency equipment for producing multi-layer composite film, widely used in food packaging, agricultural film, medical packaging, industrial materials and other fields. Its core feature is that different materials (such as PE, PP, PA, EVOH, etc.) are extruded simultaneously through three extruders, and a multi-layer structure film is formed through a co-extrusion die, which has the advantages of each layer material (such as barrier property, strength, heat sealing property, etc.). However, in the prior art, the film is manually pulled by workers, which is labor-intensive. Moreover, the freshly extruded film is high in temperature, and the workers are likely to be scalded when touching the film. Therefore, the present application provides a three-layer co-extrusion blown film machine for plastic film blowing, which can use waste plastic or normal plastic as raw material to realize automatic film blowing processing, reduce the labor intensity of workers and the risk of scalding. SUMMARY

[0003] To solve the problems mentioned in the background, the present application provides a three-layer co-extrusion blown film machine for plastic film blowing.

[0004] To achieve the above technical purposes, the technical solution adopted by the present application is as follows.

[0005] A three-layer co-extrusion blown film machine for plastic film blowing, comprising a co-extrusion blown film component and an output component, the co-extrusion blown film component comprising a co-extrusion die and a film pulling assembly.

[0006] The film pulling assembly comprises a sealed shell, the upper surface of the sealed shell is provided with a telescopic rod, the upper end of the telescopic rod is provided with an air outlet head after passing through the co-extrusion die, the side surface and the upper surface of the air outlet head are both arrayed with a plurality of air outlet holes, the lower end of the telescopic rod is connected with the upper surface of the sealed shell, and the upper surface of the sealed shell is provided with a connecting hole in communication with the telescopic rod.

[0007] A rotating shaft is rotatably installed in the sealed shell, and a coil spring is arranged at the installation position, the outer part of the rotating shaft is provided with a winding reel, and one end of the rotating shaft is provided with a connecting groove.

[0008] A flexible pipe is arranged in the telescopic rod, one end of the flexible pipe is provided with a fixed step, the fixed step is connected with the upper end of the telescopic rod, the other end of the flexible pipe is connected with the rotating shaft after passing through the winding reel, and the rotating shaft is provided with a fixing hole for realizing the communication between the connecting groove and the flexible pipe.

[0009] The outer circular surface of the sealed shell is provided with a first connecting nozzle and a second connecting nozzle, and the distal ends of the two connecting nozzles are respectively provided with a gas pump, and the end part of the rotating shaft provided with the connecting groove is sleeved in the first connecting nozzle.

[0010] Further, the telescopic rod is composed of several telescopic sections, the inside of the telescopic section is hollow, the upper end is provided with an internal step, and the lower end is provided with an external step. When the telescopic rod is extended, the external step of the upper telescopic section is sleeved in the lower telescopic section, and the adjacent two telescopic sections are prevented from being separated through the cooperation between the internal step and the external step.

[0011] Further, the co-extrusion die head comprises a base in the shape of a circular ring, and the axis of the base is vertical. The upper surface of the base is provided with a stepped groove, and the stepped groove comprises four grooves, namely groove one, groove two, groove three and groove four, from outside to inside. The groove depth of the groove one is smaller than that of the groove two, the groove depth of the groove two is smaller than that of the groove three, and the groove depth of the groove three is smaller than that of the groove four. The groove four is open to one side of the base. The outer surface of the base is provided with three side nozzles, and the three side nozzles are respectively communicated with the groove four, the groove three and the groove two. The end of the side nozzle is provided with an extruder, and the extruder is correspondingly provided with three extruders.

[0012] Further, the co-extrusion die head further comprises a die plate, and the die plate is in the shape of a circular ring arranged vertically and the upper surface of the die plate is in the shape of a curved surface. The distance between the curved surface and the axis of the die plate decreases from bottom to top.

[0013] The die plate is provided with three die plates, namely die plate one, die plate two and die plate three. The die plate one is arranged in the groove one, and the outer ring surface of the die plate one is attached to the groove wall of the groove one. The die plate two is arranged in the groove two, and the area between the outer ring surface of the die plate two and the groove wall of the groove two is a buffer area one. The die plate three is arranged in the groove three, and the area between the outer ring surface of the die plate three and the groove wall of the groove three is a buffer area two. The inner ring surface of the base is coaxially provided with a core pipe, and the area between the outer circular surface of the core pipe and the groove wall of the groove four is a buffer area three.

[0014] Among the adjacent two die plates, there is a gap area between the inner ring surface of the die plate on the outside and the outer ring surface of the die plate on the inside, and between the innermost die plate and the core pipe. The gap area is formed with three gap areas in total, and the three gap areas are respectively communicated with the buffer area one, the buffer area two and the buffer area three.

[0015] Further, the upper surface of the base is provided with an outer die seat, the upper end of the core pipe is provided with an inner die head, and the telescopic rod passes through the core pipe.

[0016] The diameter of the inner ring surface of the outer die seat decreases first, then remains the same, and then increases from bottom to top. The diameter of the outer surface of the inner die head increases first and then decreases from bottom to top.

[0017] The inner ring surface of the outer die seat, the outer surface of the inner die head and the curved surface of the three die plates together form a blending gap, and the blending gap is communicated with the three gap areas.

[0018] Further, the outer surface of the outer die seat is provided with a heating element.

[0019] Further, the upper surface of the outer mold base is provided with a wind guide ring, the inside of the wind guide ring is hollow, and the outer ring surface is provided with a joint, the end of the joint is provided with a blower, the diameter of the inner ring surface increases from bottom to top, and a plurality of air blowing holes are arranged.

[0020] Further, the output component includes a fixed lower support, the upper surface of the lower support is provided with a vertically arranged guide rod, the guide rod is slidably provided with an upper support, the upper end of the guide rod is provided with a nut, and the outside of the guide rod is sleeved with a spring one between the nut and the upper support;

[0021] One side support is respectively hinged to one end of the lower support and the upper support, the two side supports are distributed in a herringbone shape, the other end of the lower support is provided with a conveying roller one, and the other end of the upper support is provided with a conveying roller two;

[0022] One driving assembly is respectively arranged on the lower support and the upper support, and the driving assembly is used for driving the side support to deflect.

[0023] Further, the two driving assemblies are located on the side opposite to the two side supports, the driving assembly includes a connecting rod connected with the upper support or the lower support, the end of the connecting rod is hingedly provided with a driving piece, the output end of the driving piece is hingedly connected with the side support, and the driving piece can drive the distance between the side support and the connecting rod to change.

[0024] Further, a conveying roller three is arranged on the hinged shaft formed by the hinging of the side support and the lower support, and a conveying roller four is arranged on the hinged shaft formed by the hinging of the side support and the upper support;

[0025] The lower end of the side support connected with the lower support is provided with a conveying roller five, and the lower end of the side support connected with the upper support is provided with a conveying roller six;

[0026] The conveying roller one, the conveying roller two, the conveying roller three, the conveying roller four, the conveying roller five and the conveying roller six are parallel to each other and parallel to the hinged shaft between the side support and the upper support, and the end of the conveying roller one and the conveying roller two is respectively connected with a motor in a force manner;

[0027] The output component further includes a conveying belt one and a conveying belt two, the leading end of the conveying belt one is connected with the tail end of the conveying belt one after sequentially passing through the conveying roller one, the conveying roller three and the conveying roller five, and forms a closed annular loop, and the leading end of the conveying belt two is connected with the tail end of the conveying belt two after sequentially passing through the conveying roller two, the conveying roller four and the conveying roller six, and forms a closed annular loop;

[0028] Initially, under the elastic force of the spring one, the upper surface of the part of the conveying belt one between the conveying roller one and the conveying roller three and the lower surface of the part of the conveying belt two between the conveying roller two and the conveying roller four are attached.

[0029] Compared with the prior art, the present application has the beneficial effects that:

[0030] 1. In this scheme, three extruders work together. First, the outermost film material enters the blending gap through buffer zone one and the gap zone connected to buffer zone one, forming carrier one. Then, the middle layer film material enters the blending gap through buffer zone two and the gap zone connected to buffer zone two, and adheres to the inner surface of carrier one, forming carrier two. Finally, the innermost film material enters the blending gap through buffer zone three and the gap zone connected to buffer zone three, and adheres to the inner surface of carrier two, ultimately forming a three-layer film that combines the advantages of each layer.

[0031] Furthermore, based on this, by controlling the feeding pressure of the extruder for a certain layer, the thickness of that layer can be controlled accordingly. For example, the greater the pressure, the greater the extrusion volume and the thicker the layer, and vice versa, thus achieving customized product processing and meeting diverse processing needs.

[0032] Furthermore, the outermost / middle / innermost layers can work independently. In addition to three layers, there can also be two layers, such as the outermost and innermost layers combined, the outermost and middle layers combined, or the middle and innermost layers combined, to meet diverse production needs.

[0033] 2. This solution enables automated film stretching, reducing the labor intensity of workers. Based on this:

[0034] The telescopic rod extends to lift the film upwards, bringing it to the output component. During this process, flexible lifting and lowering is achieved through air, preventing rigid lifting from breaking the film. Furthermore, air outlets are also provided on the upper surface of the air outlet. The technical advantage is that the end of the film that is gathered and pinched into a sealed arrangement can also be effectively cooled and shaped, preventing it from sticking to the air outlet due to insufficient cooling and affecting the subsequent output process. In addition, the film is cooled by blowing air through two airflows, which can quickly and effectively shape the film product during the film lifting stage and in the subsequent continuous production stage.

[0035] After the telescopic rod lifts the film to the output member, the film is clamped and pulled away by the output member, and the telescopic rod moves down and away from the output member, for example, at the intermediate position between the output member and the co-extrusion die, and the technical advantages are as follows: the air flow output by the air outlet head arranged at the upper end of the telescopic rod is composed of two parts: a first part output by the air outlet holes arranged on the side surface of the air outlet head and a second part output by the air outlet holes arranged on the upper surface of the air outlet head, wherein the first part can make the corresponding position of the film bulge and then flow downward and away, and the second part flows upward along the center line of the film and then flows downward along the inner surface of the film, on the one hand, without affecting the effective cooling of the film, and on the other hand, the bulging degree of the part of the film above the air outlet head, that is, the part of the film close to the output member, is small, which is beneficial to the output member to exhaust the air in the film when the output member clamps and pulls the film away, and can prevent the film from being damaged, for example, if the air outlet head is still close to the output member, the position of the film bulging close to the output member is easy to cover the bottom of the output member, resulting in that the film is hooked by the output member and is pulled and damaged when the output member pulls the film away. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a structural schematic view of the present application;

[0037] Figure 2 is a side view of the co-extrusion film blowing member and the output member;

[0038] Figure 3 is a structural schematic view of the co-extrusion film blowing member;

[0039] Figure 4 is a sectional view of the co-extrusion film blowing member;

[0040] Figure 5 is a sectional view of the co-extrusion die;

[0041] Figure 6 is an exploded view of the co-extrusion die;

[0042] Figure 7 is a schematic view of the film pulling assembly;

[0043] Figure 8 is a schematic view of the output member.

[0044] The reference signs in the drawings are as follows:

[0045] 100, extruder; 200, co-extrusion film blowing component; 300, output component; 301, upper support; 302, lower support; 303, spring one; 304, side support; 305, conveying belt one; 306, conveying belt two; 307, support; 308, spring two; 309, connecting rod; 310, driving piece; 400, co-extrusion die head; 401, base; 4011, side nozzle; 4012, stepped groove; 402, die plate; 403, outer die base; 404, core pipe; 405, inner die head; 406, air guide ring; 407, heating element; 500, film pulling assembly; 501, sealing shell; 5011, connecting nozzle one; 5012, connecting nozzle two; 502, rotating shaft; 503, winding reel; 504, coiling spring; 505, hose; 506, telescopic rod; 507, air outlet head. DETAILED DESCRIPTION

[0046] In order to further clarify the technical means and effects adopted by the present application to achieve the predetermined inventive objectives, the specific embodiments, structures, features and effects thereof according to the present application are described in detail below in conjunction with the drawings and preferred embodiments.

[0047] In the drawings of the present solution, a refers to a film being blown.

[0048] Reference Figures 1-8 A three-layer co-extrusion film blowing machine for blowing plastic films comprises a co-extrusion film blowing component 200 and an output component 300, wherein the co-extrusion film blowing component 200 further comprises a co-extrusion die head 400 and a film pulling assembly 500.

[0049] I. Co-extrusion die head 400:

[0050] Reference Figures 4-6 The co-extrusion die head 400 comprises a base 401 in the shape of a circular ring, and the axis of the base 401 is vertical. The upper surface of the base 401 is provided with a stepped groove 4012. Specifically, the stepped groove 4012 comprises four grooves, and from outside to inside, they are groove one, groove two, groove three and groove four in sequence. The groove depth of the groove one is smaller than that of the groove two, which is smaller than that of the groove three, which is smaller than that of the groove four. The groove four is open to one side of the base 401. The outer surface of the base 401 is provided with three side nozzles 4011, which are in communication with the groove four, the groove three and the groove two respectively. The end of the side nozzle 4011 is provided with an extruder 100. Three extruders 100 are correspondingly provided, which are used to inject molten plastic into the corresponding grooves. This is a prior art and will not be described in detail.

[0051] The co-extrusion die head 400 further comprises a die plate 402, which is in the shape of a circular ring arranged vertically and the upper surface of which is provided in the shape of a curved surface. The distance between the curved surface and the axis of the die plate 402 decreases from bottom to top.

[0052] The template 402 is provided with three templates, namely template one, template two and template three. The template one is arranged in the groove one and the outer ring surface of the template one is attached to the groove wall of the groove one. The template two is arranged in the groove two and the area between the outer ring surface of the template two and the groove wall of the groove two is a buffer zone one. The template three is arranged in the groove three and the area between the outer ring surface of the template three and the groove wall of the groove three is a buffer zone two. The inner ring surface of the base 401 is coaxially provided with a core pipe 404. The area between the outer circular surface of the core pipe 404 and the groove wall of the groove four is a buffer zone three.

[0053] In the adjacent two templates 402, there is a gap zone between the inner ring surface of the template 402 on the outer side and the outer ring surface of the template 402 on the inner side. There is also a gap zone between the innermost template 402 and the core pipe 404. There are three gap zones in total and they are communicated with the three buffer zones.

[0054] The upper surface of the base 401 is provided with an outer mold seat 403. The upper end of the core pipe 404 is provided with an inner mold head 405.

[0055] The diameter of the inner ring surface of the outer mold seat 403 decreases first, then remains the same and finally increases from bottom to top. The diameter of the outer surface of the inner mold head 405 increases first and then decreases from bottom to top.

[0056] The inner ring surface of the outer mold seat 403, the outer surface of the inner mold head 405 and the arc surface of the three templates 402 together form a blending gap. The blending gap is communicated with the three gap zones.

[0057] Working process of the co-extrusion die 400:

[0058] The three extruders 100 cooperate to drive the outermost film material to pass through the buffer zone one, the gap zone connected with the buffer zone one and enter the blending gap to form a carrier one. Then, the middle layer film material passes through the buffer zone two, the gap zone connected with the buffer zone two and enters the blending gap to adhere to the inner surface of the carrier one and form a carrier two. Finally, the innermost film material passes through the buffer zone three, the gap zone connected with the buffer zone three and enters the blending gap to adhere to the inner surface of the carrier two, thereby forming a three-layer distributed film with the advantages of each layer.

[0059] Further, by controlling the feeding pressure of the extruder 100 of a certain layer, the thickness of the certain layer can be correspondingly controlled. For example, the greater the pressure, the greater the amount of extrusion, and the thicker the thickness. Conversely, it is thinner. Customized product demand processing is realized to meet the needs of diverse processing.

[0060] Further, the outermost layer / middle layer / innermost layer can work independently. In addition to three layers, two layers can also be used, such as the outermost layer and the innermost layer, the outermost layer and the middle layer, and the middle layer and the innermost layer, to meet the needs of diverse production.

[0061] Preferably, the outer surface of the outer die seat 403 is provided with a heating element 407, which plays a role of heating and keeping warm.

[0062] II. The film pulling assembly 500:

[0063] With reference to Figure 3 , Figure 4 and Figure 7 , the film pulling assembly 500 comprises a sealed shell 501, which is located below the base 401, and the upper surface of the sealed shell 501 is provided with a telescopic rod 506, the upper end of which passes through the core pipe 404 and the avoiding hole provided on the inner die head 405, and is located above the co-extrusion die head 400.

[0064] Specifically, the telescopic rod 506 is composed of several telescopic segments, the inside of which is hollow, and the upper end is provided with an internal step and the lower end is provided with an external step. When the telescopic rod 506 is elongated, the external step of the upper telescopic segment is sleeved in the lower telescopic segment, and the anti-disengagement between the adjacent two telescopic segments is realized through the cooperation between the internal step and the external step.

[0065] The lower end of the telescopic rod 506 is connected with the upper surface of the sealed shell 501, and the upper surface of the sealed shell 501 is provided with a connecting hole in communication with the telescopic rod 506.

[0066] The upper end of the telescopic rod 506 is provided with an air outlet head 507, and the side surface and the upper surface of the air outlet head 507 are both arrayed with a plurality of air outlet holes.

[0067] The sealed shell 501 is rotatably installed with a rotating shaft 502, and the installation position is provided with a coil spring 504. The outside of the rotating shaft 502 is provided with a winding disc 503, and one end of the rotating shaft 502 is provided with a connecting groove.

[0068] The telescopic rod 506 is provided with a hose 505, one end of which is provided with a fixed step and connected with the upper end of the telescopic rod 506, and the other end of the hose 505 is connected with the rotating shaft 502 after passing through the winding disc 503. The rotating shaft 502 is provided with a fixing hole for realizing the communication between the connecting groove and the hose 505.

[0069] The outer circular surface of the sealed shell 501 is provided with a first connecting nozzle 5011 and a second connecting nozzle 5012, and the distal ends of the two are respectively provided with a gas pump (not shown in the figure). In addition, the end of the rotating shaft 502 provided with the connecting groove is sleeved in the first connecting nozzle 5011.

[0070] Working process of the film pulling assembly 500:

[0071] Air enters the sealed shell 501 through the second nozzle 5012, then enters the telescopic rod 506 through the connecting hole. Since the upper end of the telescopic rod 506 is connected with the fixed step, it is equivalent to being blocked, so that the telescopic rod 506 is elongated under the continuous inflow of air. Conversely, the air in the sealed shell 501 is extracted through the second nozzle 5012, so that the telescopic rod 506 is shortened.

[0072] Air flows into the hose 505 through the first nozzle 5011, the connecting groove and the fixed hole, and then flows into the air outlet head 507. The air flows out through the air outlet hole.

[0073] III. Cooling and forming:

[0074] Referring to Figure 5 , the upper surface of the outer mold seat 403 is provided with an air guide ring 406. The air guide ring 406 is hollow inside and the outer ring surface is provided with a joint. The end of the joint is provided with a blower (not shown in the figure). The diameter of the inner ring surface increases from bottom to top and a plurality of air blowing holes are arrayed.

[0075] IV. Output member 300:

[0076] The output member 300 is located above the co-extrusion blown film member 200.

[0077] Referring to Figure 8 , the output member 300 includes a fixed lower support 302. The upper surface of the lower support 302 is provided with a vertical guide rod. The guide rod is slidably provided with an upper support 301. The upper end of the guide rod is provided with a nut. The outer part of the guide rod is provided with a spring I 303 between the nut and the upper support 301.

[0078] The lower support 302 and one end of the upper support 301 are each hingedly provided with a side support 304. The two side supports 304 are distributed in a herringbone shape. The other end of the lower support 302 is provided with a conveying roller I. The other end of the upper support 301 is provided with a conveying roller II.

[0079] The lower support 302 and the upper support 301 are each provided with a driving assembly on the upper surface, for driving the side support 304 to deflect. Specifically, the two driving assemblies are located on the side opposite to the two side supports 304. The driving assembly includes a connecting rod 309 connected with the upper support 301 or the lower support 302. The end of the connecting rod 309 is hingedly provided with a driving member 310. The output end of the driving member 310 is hingedly connected with the side support 304. The driving member 310 can change the distance between the side support 304 and the connecting rod 309. If the distance increases, the two side supports 304 can be driven to move closer to each other. Conversely, if the distance shortens, the two side supports 304 move away from each other. The driving member 310 can adopt existing electric telescopic rod technology or existing linear screw stepper motor technology, etc., which will not be described here.

[0080] The conveying roller three is arranged on the hinge shaft formed by the hinge between the side support 304 and the lower support 302, and the conveying roller four is arranged on the hinge shaft formed by the hinge between the side support 304 and the upper support 301.

[0081] The lower end of the side support 304 connected with the lower support 302 is provided with a conveying roller five, and the lower end of the side support 304 connected with the upper support 301 is provided with a conveying roller six.

[0082] All the conveying rollers are parallel to each other and parallel to the hinge shafts between the side support 304 and the upper support 301 or the lower support 302, and the end of the conveying roller one and the conveying roller two is respectively connected with a motor (not shown in the figure).

[0083] The output member 300 further comprises two conveying belts: a conveying belt one 305 and a conveying belt two 306, wherein:

[0084] The leading end of the conveying belt one 305 is connected with the tail end of the conveying belt one 305 after sequentially passing through the conveying roller one, the conveying roller three and the conveying roller five, and forms a closed annular loop.

[0085] The leading end of the conveying belt two 306 is connected with the tail end of the conveying belt two 306 after sequentially passing through the conveying roller two, the conveying roller four and the conveying roller six, and forms a closed annular loop.

[0086] Initially, the upper surface of the part of the conveying belt one 305 between the conveying roller one and the conveying roller three and the lower surface of the part of the conveying belt two 306 between the conveying roller two and the conveying roller four are adhered under the elastic force of the spring one 303.

[0087] Preferably, in order to keep the conveying belt one 305 and the conveying belt two 306 in a taut state, the end of the side support 304 is slidably provided with a support 307 in a direction perpendicular to the conveying roller one, and the conveying roller five and the conveying roller six are respectively provided with corresponding supports 307, and the spring two 308 is arranged between the support 307 and the side support 304, and the elastic force of the spring two 308 is used to make the support 307 move away from the lower support 302, so as to make the conveying belt one 305 and the conveying belt two 306 tensioned and kept in a taut state.

[0088] The working principle of the present application is as follows:

[0089] Three extruders 100 cooperate, first drive the outermost film material through the buffer zone one, and the gap zone connected with the buffer zone one into the blending gap, forming the carrier one, then the middle layer of film material through the buffer zone two, and the gap zone connected with the buffer zone two into the blending gap, and adhere to the inner surface of the carrier one, and shape the carrier two, finally, the innermost film material passes through the buffer zone three, and the gap zone connected with the buffer zone three into the blending gap, and adhere to the inner surface of the carrier two, and finally form a three-layer distributed film, which has the advantages of each layer;

[0090] At the same time, air flows into the hose 505 through the connecting nozzle 5011, the connecting groove and the fixing hole, and then flows into the air outlet head 507, and then flows out through the air outlet hole. The air flows out through the air guide ring 406 and the air blowing hole. The two air flows cooperate to cool the film extruded through the co-extrusion die head 400. It should be noted that the film still has viscosity and needs to be manually gathered and pinched into a ball in a sealed arrangement by workers;

[0091] Then, the air enters the sealing shell 501 through the connecting nozzle 5012, and then enters the telescopic rod 506 through the connecting hole, and drives the telescopic rod 506 to elongate. At the same time, the two air flows mentioned above for cooling still continue to run, so:

[0092] The elongation of the telescopic rod 506 can lift the film upward and top it to the output member 300. During this process, the air is used for flexible lifting drive to avoid rigid lifting and top breaking the film. Further, the upper surface of the air outlet head 507 is also provided with an air outlet hole, and its technical advantage is that the end of the film gathered and pinched into a sealed arrangement can also be effectively cooled and formed, avoiding the end from being unable to be effectively cooled and adhered to the air outlet head 507, affecting the subsequent output process;

[0093] The two air flows can realize air blowing and cooling of the film, which can quickly and effectively shape the film product during the lifting stage and the subsequent continuous production stage of the film;

[0094] After the telescopic rod 506 lifts the film to the output member 300, the driving member 310 operates to drive the distance between the side bracket 304 and the connecting rod 309 to be larger, so that the two side brackets 304 approach each other, and then the film is clamped by the conveying belt one 305 and the conveying belt two 306. At the same time, the conveying belt one 305 and the conveying belt two 306 are started, so as to clamp the film and output it outward. It should be noted that how to store the output film is realized by the prior art, which is not described here;

[0095] The telescopic rod 506 is then moved downward, away from the output member 300, for example, at a position between the output member 300 and the co-extrusion die head 400, and the technical advantage is that the air flow output by the air outlet head 507 provided at the upper end of the telescopic rod 506 is composed of two parts: a first part output by the air outlet holes provided on the side surface of the air outlet head 507 and a second part output by the air outlet holes provided on the upper surface of the air outlet head 507, wherein the first part can make the corresponding position of the film bulge and then flow away downward, and the second part flows upward along the center line of the film and then flows downward along the inner surface of the film, on the one hand, without affecting the effective cooling of the film, on the other hand, the bulging degree of the part of the film above the air outlet head 507, that is, the part of the film close to the output member 300, is small, which is beneficial to the output member 300 to exhaust the air in the film and can prevent the film from being damaged when the output member 300 clamps and pulls the film away. For example, if the air outlet head 507 is still close to the output member 300, the position of the film bulging is close to the output member 300, which is easy to cover the bottom of the output member 300, resulting in that the film is hooked by the output member 300 and is damaged by pulling when the output member 300 pulls the film away.

[0096] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application, and any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application, without departing from the technical solution of the present application, are still within the scope of the technical solution of the present application.

Claims

1. A three-layer co-extrusion blown film machine for blowing a plastic film, characterized in that, The application relates to a co-extrusion blown film device, which comprises a co-extrusion blown film component (200) and an output component (300), wherein the co-extrusion blown film component (200) comprises a co-extrusion die head (400) and a film drawing assembly (500). The film drawing assembly (500) comprises a sealed shell (501), the upper surface of the sealed shell (501) is provided with a telescopic rod (506), the upper end of the telescopic rod (506) is provided with an air outlet head (507) after penetrating through the co-extrusion die head (400), the side surface and the upper surface of the air outlet head (507) are both provided with a plurality of air outlet holes, the lower end of the telescopic rod (506) is connected with the upper surface of the sealed shell (501), and the upper surface of the sealed shell (501) is provided with a connecting hole in communication with the telescopic rod (506). The sealed shell (501) is rotatably provided with a rotating shaft (502), and a coil spring (504) is arranged at the mounting position; the outer portion of the rotating shaft (502) is provided with a winding reel (503); and one end of the rotating shaft (502) is provided with a connecting groove. The telescopic rod (506) is provided with a hose (505), one end of the hose (505) is provided with a fixed step and is connected with the upper end of the telescopic rod (506), and the other end of the hose (505) is connected with the rotating shaft (502) after penetrating through the winding reel (503); and the rotating shaft (502) is provided with a fixing hole for realizing the communication between the connecting groove and the hose (505). The outer circular surface of the sealed shell (501) is provided with a first connecting nozzle (5011) and a second connecting nozzle (5012), the distal ends of the two connecting nozzles are respectively provided with an air pump, and the end of the rotating shaft (502) provided with the connecting groove is sleeved in the first connecting nozzle (5011).

2. A three-layer co-extrusion blown film machine for blowing plastic film according to claim 1, characterized in that, The telescopic rod (506) is composed of a plurality of telescopic sections, the telescopic sections are hollow, the upper end of each telescopic section is provided with an inner step, and the lower end of each telescopic section is provided with an outer step; when the telescopic rod (506) is elongated, the outer step of the upper telescopic section is sleeved in the lower telescopic section among the adjacent two telescopic sections, and the cooperation between the inner step and the outer step realizes the anti-disengagement between the adjacent two telescopic sections.

3. A three-layer co-extrusion blown film machine for blowing plastic film as claimed in claim 1, wherein, The co-extrusion die head (400) comprises a base (401) in the shape of a circular ring, the axis of the base (401) is vertical, the upper surface of the base (401) is provided with a stepped groove (4012), the stepped groove (4012) comprises four grooves, and the grooves are sequentially a groove one, a groove two, a groove three and a groove four from outside to inside; the groove depth of the groove one is smaller than that of the groove two, the groove depth of the groove two is smaller than that of the groove three, the groove depth of the groove three is smaller than that of the groove four, and the groove four is open to one side of the base (401); the outer surface of the base (401) is provided with three side nozzles (4011), the three side nozzles (4011) are respectively in communication with the groove four, the groove three and the groove two, the distal ends of the side nozzles (4011) are provided with extruders (100), and the extruders (100) are correspondingly provided with three extruders.

4. A three-layer co-extrusion blown film machine for blowing plastic film according to claim 3, wherein The co-extrusion die head (400) further comprises a die plate (402), the die plate (402) is in the shape of a circular ring arranged vertically and the upper surface of the die plate (402) is provided in the shape of a curved surface, the distance between the curved surface and the axis of the die plate (402) decreases from bottom to top. The template (402) is provided with three templates, namely template one, template two and template three. The template one is arranged in the groove one and the outer ring surface of the template one is attached to the groove wall of the groove one. The template two is arranged in the groove two and the area between the outer ring surface of the template two and the groove wall of the groove two is a buffer area one. The template three is arranged in the groove three and the area between the outer ring surface of the template three and the groove wall of the groove three is a buffer area two. The inner ring surface of the base (401) is coaxially provided with a core pipe (404). The area between the outer circular surface of the core pipe (404) and the groove wall of the groove four is a buffer area three. In the two adjacent templates (402), there is a gap area between the inner ring surface of the template (402) on the outer side and the outer ring surface of the template (402) on the inner side, and between the innermost template (402) and the core pipe (404). The gap area is formed with three in total and is communicated with the buffer area one, the buffer area two and the buffer area three.

5. A three-layer co-extrusion blown film machine for blowing plastic film as claimed in claim 4, wherein, The upper surface of the base (401) is provided with an outer mold base (403). The upper end of the core pipe (404) is provided with an inner mold head (405). The telescopic rod (506) passes through the core pipe (404). The diameter of the inner ring surface of the outer mold base (403) decreases first, then remains the same and finally increases from bottom to top. The diameter of the outer surface of the inner mold head (405) increases first and then decreases from bottom to top. The inner ring surface of the outer mold base (403), the outer surface of the inner mold head (405) and the arc surface of the three templates (402) together form a blending gap, which is communicated with the three gap areas.

6. A three-layer co-extrusion blown film machine for blowing plastic film as claimed in claim 5, wherein, The outer surface of the outer mold base (403) is provided with a heating element (407).

7. A three-layer co-extrusion blown film machine for blowing plastic film as claimed in claim 5 wherein, The upper surface of the outer mold base (403) is provided with an air guide ring (406). The inside of the air guide ring (406) is hollow and the outer ring surface is provided with a joint. The end of the joint is provided with a blower. The diameter of the inner ring surface increases from bottom to top and is arrayed with a plurality of air blowing holes.

8. A three-layer co-extrusion blown film machine for blowing plastic film as claimed in claim 1, wherein, The output member (300) includes a fixed lower support (302). The upper surface of the lower support (302) is provided with a vertically arranged guide rod. The guide rod is slidably provided with an upper support (301). The upper end of the guide rod is provided with a nut. The outside of the guide rod is provided with a spring one (303) between the nut and the upper support (301). The lower support (302) and one end of the upper support (301) are each hingedly provided with a side support (304). The two side supports (304) are distributed in a herringbone shape. The other end of the lower support (302) is provided with a conveying roller one. The other end of the upper support (301) is provided with a conveying roller two. The lower support (302) and the upper support (301) are each provided with a driving assembly. The driving assembly is used to drive the deflection of the side support (304).

9. A three-layer co-extrusion blown film machine for blowing plastic film as claimed in claim 8, wherein, The two driving assemblies are located on the side opposite to the two side supports (304). The driving assembly includes a connecting rod (309) connected with the upper support (301) or the lower support (302). The end of the connecting rod (309) is hingedly provided with a driving member (310). The output end of the driving member (310) is hingedly connected with the side support (304). The driving member (310) can change the distance between the side support (304) and the connecting rod (309).

10. A three-layer co-extrusion blown film machine for blowing plastic film as claimed in claim 8, wherein, The conveying roller three is arranged on the hinge shaft formed by the hinge between the side support (304) and the lower support (302), and the conveying roller four is arranged on the hinge shaft formed by the hinge between the side support (304) and the upper support (301); The lower end of the side support (304) connected with the lower support (302) is provided with the conveying roller five, and the lower end of the side support (304) connected with the upper support (301) is provided with the conveying roller six; The conveying roller one, the conveying roller two, the conveying roller three, the conveying roller four, the conveying roller five and the conveying roller six are parallel to each other and parallel to the hinge shaft between the side support (304) and the upper support (301), and the end of the conveying roller one and the conveying roller two is automatically connected with the motor; The output component (300) further comprises a conveying belt one (305) and a conveying belt two (306), the leading end of the conveying belt one (305) is sequentially wound around the conveying roller one, the conveying roller three and the conveying roller five, and then connected with the tail end of the conveying belt one (305), and forms a closed annular loop, and the leading end of the conveying belt two (306) is sequentially wound around the conveying roller two, the conveying roller four and the conveying roller six, and then connected with the tail end of the conveying belt two (306), and forms a closed annular loop; Initially, under the elastic force of the spring one (303), the upper surface of the part of the conveying belt one (305) between the conveying roller one and the conveying roller three is attached to the lower surface of the part of the conveying belt two (306) between the conveying roller two and the conveying roller four.

Images