A multi-layer co-extrusion film production line with automatic batching

Abstract

The present invention discloses a multi-layer co-extrusion film production line with automatic batching, including a multi-layer co-extrusion film forming device and a batching system connected to the multi-layer co-extrusion film forming device; the multi-layer co-extrusion film forming device includes a co-extrusion film mold, a vacuum cooling cylinder, a first traction roller, an irradiation chain machine, an air cooling knife, a second traction roller, a water bath heating device, a third traction roller, a hot air knife, a blowing heating device, a fourth traction roller, a cooling air ring, a fifth traction roller, a sixth traction roller, a shaping heating device, an air cooling device, a seventh traction roller and a winding device arranged in sequence according to the production process of the multi-layer co-extrusion film; the batching system includes a feeding center, a material distribution center, a batching conveying pipeline and a co-extrusion film feeding center; the multi-layer co-extrusion film forming device is provided with a secondary film bubble rupture rapid disposal device. The present invention realizes the automation of batching of the multi-layer co-extrusion film forming device and improves the disposal speed after the secondary film bubble ruptures in the film forming process.

Description

Technical Field

[0001] The invention relates to the technical field of co-extrusion film production equipment, in particular to a multi-layer co-extrusion film production line using automatic batching. Background Art

[0002] Multi-layer co-extrusion film forming equipment is a kind of equipment that produces multi-layer composite film products (such as food packaging bags, etc.) through the co-extrusion process. It can heat and melt plastic particles and then blow them into thin films. According to the number of layers of the composite film, multi-layer co-extrusion film forming equipment can also be divided into three-layer co-extrusion film forming equipment, five-layer co-extrusion film forming equipment, seven-layer co-extrusion film forming equipment, nine-layer co-extrusion film forming equipment, etc. The main components of the multi-layer co-extrusion film forming equipment include multi-layer co-extrusion film extrusion die, film blowing system, cooling system and winding system, as well as multiple screw extruders that provide high-pressure hot melt materials for the multi-layer co-extrusion film extrusion die.

[0003] There are multiple annular extrusion cavities in the multi-layer co-extrusion film mold, and the multiple annular extrusion cavities merge at the discharge end. When the multi-layer co-extrusion film forming equipment is working, each screw extruder is responsible for feeding the combined ingredients of one layer of the multi-layer composite film. Each screw extruder mixes and heats and melts the materials (plastic particles) with different ingredient combinations, and then injects them into the inner annular extrusion cavities of the multi-layer co-extrusion film mold through high pressure, forming a composite at the discharge port of the multi-layer co-extrusion film mold, and then blowing the film, cooling and shaping it, and then rolling it up to obtain a film product.

[0004] The typical process of blown film using multi-layer co-extrusion film forming equipment is as follows: the raw materials are fed into the extrusion die through a screw extruder, and the molten material is extruded from the annular die of the extrusion die under pressure, and a relatively thick tube film is formed after cooling and shaping, and the front end of the tube film is clamped between a pair of bubble squeezing and traction rollers, and compressed air is filled into the tube film through the extrusion die, and a section of the tube film between the annular die of the extrusion die and the pair of bubble squeezing and traction rollers is blown (called primary film blowing), and the tube film is blown into a relatively thin-walled film bubble (called a primary film bubble), and the film bubble is pulled and flattened by a pair of bubble squeezing and traction rollers and then drawn out to form a film, which is wound by a winding device.

[0005] The above-mentioned multi-layer co-extrusion film forming equipment in the prior art also has the following shortcomings:

[0006] First, the materials provided to the screw extruder are artificially batched, the production efficiency is low and the quality of the ingredients is not easy to guarantee.

[0007] Second, due to the characteristics of their materials, some films need to be heated for shaping and corrected in size multiple times during their production process. For this reason, it may be necessary to blow the film twice or even three times to make a film with ideal wall thickness and stable performance. That is, on the basis of the first blown film, the film drawn out by the bubble squeezing traction roller must be blown a second time to form a secondary film bubble. The secondary film bubble is pulled out by a pair of bubble squeezing traction rollers and flattened to form a thinner film. According to different needs, three times of blowing can also be performed. The film bubble formed is called a tertiary film bubble. After being pulled and flattened by a pair of bubble squeezing traction rollers, it is drawn out to form the required final film. The final film is wound by a winding device. Through double or triple blowing, a film with a single-side wall thickness of no more than 0.05 mm and stable performance can be made.

[0008] In the above-mentioned film blowing process using extrusion film forming equipment, secondary film bubbles and tertiary film bubbles need to be formed by artificial inflation in the initial stage of film production (called bubble making). Specifically, the operator holds an inflation gun and performs secondary inflation on the film drawn out and flattened by a pair of extrusion traction rollers. The film after secondary inflation is then clamped by the operator in a pair of extrusion traction rollers in front of the film moving direction, thereby forming secondary film bubbles between the front and rear extrusion traction rollers. Tertiary film bubbles can also be formed by the same operation.

[0009] The above-mentioned deficiencies in the film blowing molding process using the extrusion film molding equipment are: since the film material extruded from the mold may contain relatively large particles, the presence of particles or the uneven film thickness will affect the stability of the secondary or tertiary film bubbles in continuous production, causing the local strength of the film bubble to drop sharply, leading to the rupture of the film bubble. At present, the disposal of the rupture of the film bubble in continuous production is a rather troublesome matter, which requires multiple operators at each station to work together to deal with it and make bubbles manually. If the bubble making time is too long due to the slow disposal speed, the film material coming out of the extrusion die in continuous production will be scrapped, generating a large amount of waste.

[0010] Therefore, it is necessary to overcome the above shortcomings through technical improvements. Summary of the invention

[0011] In order to solve the above problems, the present invention proposes a multi-layer co-extrusion film production line with automatic batching, which aims to realize the automation of batching of multi-layer co-extrusion film forming equipment and improve the disposal speed after the secondary film bubble rupture in the film forming process, overcoming the disadvantages of conventional manual disposal that requires more labor and easily generates a large amount of waste. The specific technical solution is as follows:

[0012] A multi-layer co-extrusion film production line using automatic batching, including a multi-layer co-extrusion film forming device and a batching system connected to the multi-layer co-extrusion film forming device; the multi-layer co-extrusion film forming device includes a co-extrusion film mold, a vacuum cooling cylinder, a first traction roller, an irradiation chain machine, an air cooling knife, a second traction roller, a water bath heating device, a third traction roller, a hot air knife, a blowing heating device, a fourth traction roller, a cooling air ring, a fifth traction roller, a sixth traction roller, a shaping heating device, an air cooling device, a seventh traction roller and a winding device, which are arranged in sequence according to the production process of the multi-layer co-extrusion film; the batching system includes a feeding center, a material distribution center, a batching conveying pipeline and a co-extrusion film feeding center which are arranged accordingly according to the batching process; the feeding center includes a number of feeding stations; The material distribution center includes a number of multi-channel distribution pipes, each of which includes a feed pipe and a plurality of discharge pipes connected to the feed pipe, and the feed pipe on the multi-channel distribution pipe is connected to one of the feeding stations in the feeding center; the co-extrusion film feeding center includes a number of screw extruders connected to the co-extrusion film mold for realizing multi-layer film co-extrusion, and a number of mixing storage bin assemblies for supplying materials to each of the screw extruders; the ingredient conveying pipeline includes a feed pipe assembly composed of a number of feed pipes connected to each of the mixing storage bin assemblies, and each feed pipe in the same feed pipe assembly is respectively connected to the discharge pipes belonging to different multi-channel distribution pipes in the material distribution center.

[0013] In the present invention, the extrusion film production process of the multi-layer co-extrusion film production line includes the following steps:

[0014] The raw materials from the batching system feeding station are distributed through the multi-channel distribution pipes of the distribution center, and then transported to the mixed storage bin components of the co-extrusion film feeding center through the batching conveying pipeline. The mixed storage bin components transport the prepared materials to the corresponding screw extruder. After the materials are batched, they are hot-melted and mixed in the screw extruder, and then sent into the co-extrusion film mold at a higher pressure, and extruded at the die of the co-extrusion film mold to form a hollow tube film composed of multiple layers of different materials. The hollow tube film enters the vacuum cooling cylinder as a primary film bubble to cool and shape, and then is pulled and clamped by the first traction roller and comes out. The tube film material is cross-linked by the irradiation cross-linking machine, and then air-cooled and shaped by the air-cooling knife, and then enters the water bath heating device through the second traction roller. The tube film is placed in a water bath for heating. After being heated in the water bath, it comes out from the third traction roller, is heated by the hot air knife and the inflation heating device in turn, and is pulled by the fourth traction roller and then passes through the cooling air ring. The tube film forms a secondary film bubble with built-in compressed air between the cooling air ring and the fifth traction roller. Under the action of the compressed air inside the secondary film bubble, the wall thickness of the tube film is reduced and the diameter is increased. After being pulled and clamped by the fifth traction roller, the tube film comes out through the sixth traction roller, and passes through the shaping heating device and the air cooling device in turn. The tube film forms a tertiary film bubble with built-in compressed air between the sixth traction roller and the air cooling device. Under the action of the compressed air inside the tertiary film bubble, the wall thickness of the tube film is further reduced, and the diameter is fine-tuned to the specified size. After being pulled and clamped by the seventh traction roller, it is wound up by the winding device.

[0015] In the present invention, a secondary film bubble rupture rapid disposal device is provided in the multi-layer co-extrusion film forming equipment, and the secondary film bubble rupture rapid disposal device includes a tube film terminal sending station whose initial position is set close to the rear end position of the secondary film bubble (close to the cooling air ring end) in the direction of forward movement of the tube film, and is used to clamp the tube film after the secondary film bubble ruptures and send it to the pair of fifth traction roller positions. The tube film terminal sending station includes a moving mechanism and a clamping module arranged on the moving mechanism, and a pair of sending station clamps arranged on the clamping module for quickly clamping the tube film terminal after the secondary film bubble ruptures; a number of secondary film bubble rupture detection sensors are circumferentially arranged on the periphery of the secondary film bubble position for detecting whether the secondary film bubble is ruptured.

[0016] In the present invention, the pair of fifth traction rollers are opening and closing type bubble squeezing traction rollers capable of being loosened and closed, and a turning is arranged after the tubular film is output from between the pair of fifth traction rollers, and a tubular film terminal receiving station for receiving tubular film terminals sent from the tubular film terminal sending station to the position of a pair of fifth traction rollers is also arranged near and opposite to the output end of the pair of fifth traction rollers, and the tubular film terminal receiving station includes a moving mechanism and a clamping module arranged on the moving mechanism, and a pair of receiving station clamps arranged on the clamping module for quickly clamping the rear end of the secondary film bubble when the secondary film bubble ruptures.

[0017] Preferably, the moving mechanism used in the tube film terminal sending station is a linear moving mechanism, the linear moving mechanism includes a moving plate that moves in a linear direction, and the clamping module is installed on the moving plate; the pair of sending station chucks located at the tube film terminal sending station are detachably provided with a tube film automatic bubbler, and the tube film automatic bubbler includes a pair of inflation clamps correspondingly and detachably provided on the pair of sending station chucks for clamping the tube film terminal, a pair of extension blocks provided at the rear outer side of the inflation clamps and extending toward the rear, a blowing needle provided at the inner side of one of the pair of extension blocks for inflating the inside of the tube film terminal, a pair of film suction cylinders provided at both sides of the rear of the tube film terminal, and a vacuum suction cup provided at the front end of the piston rod of the film suction cylinder, and the pair of vacuum suction cups of the pair of film suction cylinders are respectively arranged on both sides of the extension block; a detachable connecting structure is provided between the inflation clamps and the sending station chuck.

[0018] Preferably, the air blowing needle comprises an air blowing tube for connecting to a compressed air source, a conical needle transitionally connected to the end of the air blowing tube, and an air blowing hole arranged on the outer circle of the front end of the air blowing tube or on the conical needle and connected to the inner hole of the air blowing tube; a compressed air inflation passage is arranged inside the inflatable clamp block, and the air blowing tube of the air blowing needle is fixed on the inner side of the extension block and is connected to the compressed air inflation passage on the inflatable clamp block.

[0019] In the present invention, the detachable connection structure between the inflatable clamp block and the sending station clamp is as follows: a pair of first positioning pins are provided on the side of the inflatable clamp block that abuts against the sending station clamp, and a pair of first positioning holes are correspondingly provided on the side of the sending station clamp that abuts against the inflatable clamp block. The pair of first positioning pins on the inflatable clamp block are correspondingly inserted into the pair of first positioning holes, and the planes between the inflatable clamp block and the sending station clamp are abutted against each other.

[0020] In the present invention, an automatically inflated sending-end docking air circuit structure is also provided between the sending station chuck and the inflatable clamp block, and the sending-end docking air circuit structure is as follows: a first compressed air receiving hole connected to the compressed air inflation passage is provided on the outer end face of the inflatable clamp block, and an inflation one-way valve is provided in the first compressed air receiving hole; an inflation docking air circuit that is docked and connected to the first compressed air receiving hole of the inflatable clamp block is provided on the sending station chuck, and the inflation docking air circuit is connected to an external compressed air source through an inflation pipeline.

[0021] In the present invention, a detachable connection structure is provided between the inflatable clamp block and the receiving station clamp, and the detachable connection structure between the inflatable clamp block and the receiving station clamp is as follows: a pair of second positioning pins are provided on the side of the inflatable clamp block that abuts against the receiving station clamp, and a pair of second positioning holes are correspondingly provided on the side of the receiving station clamp that abuts against the inflatable clamp block, the pair of second positioning pins on the inflatable clamp block are correspondingly inserted into the pair of second positioning holes, and the planes between the inflatable clamp block and the receiving station clamp are abutted against each other.

[0022] In the present invention, an automatically inflated receiving end docking air path structure is also provided between the receiving station chuck and the inflatable clamp block, and the receiving end docking air path structure is as follows: a second compressed air receiving hole connected to the compressed air inflation path is provided on the outer end face of the inflatable clamp block, and an inflation one-way valve is provided in the second compressed air receiving hole; an inflation docking air path that is docked and connected to the second compressed air receiving hole of the inflatable clamp block is provided on the receiving station chuck, and the inflation docking air path is connected to an external compressed air source through an inflation pipeline.

[0023] The beneficial effects of the present invention are:

[0024] First, the present invention is a multi-layer co-extrusion film production line using automatic batching, in which a batching system is provided with a feeding center, a material distribution center, a batching delivery pipeline and a co-extrusion film feeding center that are matched with the multi-layer co-extrusion film forming equipment, so as to realize the automation of the batching of the multi-layer co-extrusion film forming equipment, thereby improving the efficiency of the multi-layer co-extrusion film production and improving the quality stability of the multi-layer co-extrusion film production. By setting up a material distribution center and combining it with a batching delivery pipeline, automatic batching for multiple multi-layer co-extrusion film forming equipment can be realized, thereby further improving the efficiency of the batching system.

[0025] Secondly, the present invention adopts a multi-layer co-extrusion film production line with automatic batching, and the tube film blowing of the multi-layer co-extrusion film forming equipment adopts a three-bubble forming process, and uses an irradiation cross-linking machine to perform material cross-linking treatment before the two-bubble process, thereby improving the quality of the co-extrusion film product.

[0026] Third, the present invention is a multi-layer co-extrusion film production line with automatic batching, and a secondary film bubble rupture rapid disposal device is provided in the multi-layer co-extrusion film forming equipment. Through a specially arranged tube film terminal sending station, the tube film terminal is quickly moved toward a pair of fifth traction rollers after the secondary film bubble ruptures, thereby improving the rapid disposal speed after the secondary film bubble ruptures.

[0027] Fourthly, a multi-layer co-extrusion film production line with automatic batching of the present invention provides an automatic tube film bubble blower in the rapid disposal device for secondary film bubble rupture, so that the tube film terminal can achieve rapid inflation and bubble making operation during rapid movement toward a pair of fifth traction rollers, thereby further improving the rapid disposal speed after the secondary film bubble ruptures.

[0028] Fifth, the multi-layer co-extrusion film production line of the present invention adopts automatic batching, and the secondary film bubble rupture rapid disposal device can overcome the disadvantage of the slow speed of the tube film terminal passing through the fifth traction roller when manual operation is used in the traditional disposal method through the mutual cooperation of the tube film terminal sending station and the tube film terminal receiving station, thereby further improving the rapid disposal speed after the secondary film bubble ruptures.

[0029] Sixth, in a multi-layer co-extrusion film production line with automatic batching of the present invention, in a rapid disposal device for secondary film bubble rupture, operations such as inflation of the tube film terminal, movement of the tube film terminal, relay and inflation of the tube film terminal, and passage of the tube film terminal through a pair of fifth traction rollers are performed almost in the same time period, and its high-efficiency disposal speed can overcome the disadvantages of conventional manual disposal that requires more labor and easily generates a large amount of waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a multi-layer co-extrusion film production line using automatic batching of the present invention;

[0031] Figure 2 yes Figure 1 A schematic diagram of the structure of the batching system;

[0032] Figure 3 yes Figure 2 The structural diagram of the material distribution center in FIG.

[0033] Figure 4 yes Figure 2 A schematic diagram of the structure of the pigging assembly;

[0034] Figure 5 yes Figure 4 A partial enlarged view of the middle right half;

[0035] Figure 6 yes Figure 5 A schematic diagram of the structure of the mixed storage silo assembly;

[0036] Figure 7 yes Figure 1 One of the structural schematic diagrams of the secondary membrane bubble rupture rapid disposal device (the state diagram of the tube membrane terminal sending station in the initial position);

[0037] Figure 8This is the second structural schematic diagram of the rapid disposal device for secondary membrane bubble rupture (when the secondary membrane bubble ruptures, the tube membrane terminal sending station in the initial position performs rapid disposal, clamps the tube membrane terminal and inflates it);

[0038] Fig. 9 yes Figure 8 A partial enlarged schematic diagram of the inflatable clamping block part involved in the invention;

[0039] Fig.10 This is the third structural diagram of the secondary membrane bubble rupture rapid disposal device (a state diagram of the tube membrane terminal sending station and the tube membrane terminal receiving station performing mobile docking);

[0040] Fig.11 yes Fig.10 A local enlarged schematic diagram of the docking part;

[0041] Fig.12 This is the fourth structural schematic diagram of the device for rapid disposal of secondary membrane bubble rupture (a state diagram after the tube membrane terminal sending station and the tube membrane terminal receiving station are docked and reset respectively, a pair of fifth traction rollers are reset, and the tube membrane bubble is completed).

[0042] In the figure: 100, batching system, 101, feeding center, 102, material distribution center, 103, batching and conveying pipeline, 104, co-extrusion film feeding center, 105, feeding station, 106, multi-channel distribution pipe, 107, feed pipe, 108, discharge pipe, 109, mixed storage bin assembly, 110, conveying pipe, 111, storage bin, 112, cleaning assembly, 113, pneumatic ball valve, 114, cleaning valve, 115, vacuum hopper, 116, negative pressure fan, 117, buffer hopper, 118, spiral metering feeder, 119, bracket, 120, rack platform, 121, bridge frame, 122, upper platform, 123, lower platform, 124, manual hopper, 125, screw extruder.

[0043] In the figure: A is the installation position of the screw extruder and the multi-layer co-extrusion film die;

[0044] In the figure: 200, multi-layer co-extrusion film forming equipment, 201, tube film, 202, secondary film bubble, 203, the fifth traction roller (bubble extrusion traction roller), 204, tube film terminal sending station, 205, moving mechanism, 206, clamping module, 207, tube film terminal, 208, sending station chuck, 209, secondary film bubble rupture detection sensor, 210, tube film terminal receiving station, 211, receiving station chuck, 212, moving plate, 213, tube film automatic bubble blower, 214, inflation clamp block, 215, extension block, 216, blowing needle, 217, film suction cylinder, 218, vacuum suction cup, 219, cutter, 220, blowing pipe, 221, conical needle, 222, blowing hole, 223, compressed air inflation passage, 224, first positioning pin, 225. First compressed air receiving hole, 226. Inflating one-way valve, 227. Inflating docking air path, 228. First overload pressure relief hole, 229. Exhaust one-way valve, 230. First overload pressure relief docking air path, 231. Second positioning pin, 232. Second compressed air receiving hole, 233. Second overload pressure relief hole, 234. Second overload pressure relief docking air path, 235. Docking distance measuring sensor, 236. Cooling air ring.

[0045] In the figure: 300, multi-layer co-extrusion film production line, 301, co-extrusion film mold, 302, vacuum cooling cylinder, 303, first traction roller, 304, irradiation chain machine, 305, air cooling knife, 306, second traction roller, 307, water bath heating device, 308, third traction roller, 309, hot air knife, 310, inflation heating device, 311, fourth traction roller, 312, cooling air ring, 314, sixth traction roller, 315, shaping heating device, 316, air cooling device, 317, seventh traction roller, 318, winding device, 319, movable guide rail assembly, 320, ranging and positioning sensor. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0047] like Figures 1 to 12The multi-layer co-extrusion film production line 300 with automatic batching of the present invention is shown as an embodiment of the present invention, comprising a multi-layer co-extrusion film forming device 200 and a batching system 100 connected to the multi-layer co-extrusion film forming device 200; the multi-layer co-extrusion film forming device 200 comprises a co-extrusion film mold 301, a vacuum cooling cylinder 302, a first traction roller 303, an irradiation chain machine 304, an air cooling knife 305, a second traction roller 306, a water bath heating device 307, which are sequentially arranged according to the production process of the multi-layer co-extrusion film. 07, a third traction roller 308, a hot air knife 309, an inflation heating device 310, a fourth traction roller 311, a cooling air ring 312, a fifth traction roller 203, a sixth traction roller 314, a shaping heating device 315, an air cooling device 316, a seventh traction roller 317 and a winding device 318; the batching system 100 includes a feeding center 101, a material distribution center 102, a batching conveying pipeline 103 and a co-extrusion film feeding center 104 which are arranged according to the batching process; the feeding center 101 includes a number of feeding stations 105; the distribution center 102 includes a number of multi-channel distribution pipes 106, the multi-channel distribution pipe 106 includes a feed pipe 107, and a plurality of discharge pipes 108 connected to the feed pipe 107, the feed pipe 107 on the multi-channel distribution pipe 106 is connected to one of the feeding stations 105 in the feeding center 101; the co-extrusion film feeding center 104 includes a co-extrusion film feeding station 105 connected to the multi-layer co-extrusion film forming equipment There are several screw extruders 125 on the film mold 301 and several mixing storage bin assemblies 109 for supplying materials to each of the screw extruders 125; the ingredient conveying pipeline 103 includes a feed pipe assembly composed of a number of feed pipes 110 which are matched and connected to each of the mixing storage bin assemblies 109, and each feed pipe 110 in the same feed pipe assembly is respectively connected to the discharge pipe 108 belonging to different multi-channel distribution pipes 106 in the material distribution center 102.

[0048] Preferably, the multi-layer co-extrusion film forming equipment is one of a seven-layer co-extrusion film equipment, a nine-layer co-extrusion film equipment, and an eleven-layer co-extrusion film equipment.

[0049] Preferably, the multi-channel distribution pipe 106 has one feed pipe 107 and four discharge pipes 108 .

[0050] In the above-mentioned material delivery pipeline 103, for the same or different multi-layer co-extrusion film forming equipment, the number of delivery pipes in each group of delivery pipe assemblies can be the same or different.

[0051] Preferably, the batching conveying pipeline 103 further includes a cleaning assembly 112 disposed on the conveying pipe 110 , and the cleaning assembly 112 includes a pneumatic ball valve 113 and a cleaning valve 114 .

[0052] The feed pipe of the above-mentioned batching delivery pipeline is provided with a pipe cleaning valve assembly, which greatly facilitates the cleaning of the pipeline system.

[0053] In this embodiment, the mixing storage bin assembly 109 includes a storage bin 111 and a mixer connected to the top of the storage bin 111, and a plurality of vacuum hoppers 115 connected above the mixer, and the feed pipe 110 is connected to the vacuum hopper 115 on the top of the mixing storage bin assembly 109.

[0054] In this embodiment, the vacuum hopper 115 is connected to a negative pressure fan 116 .

[0055] Preferably, the negative pressure blower 116 is a vortex blower or a Roots blower.

[0056] Preferably, each negative pressure fan 116 can undertake the feeding task of multiple vacuum hoppers.

[0057] Preferably, a buffer hopper 117 connected to the vacuum upper hopper 115 is provided at the upper portion of the mixer, and a spiral metering feeder 118 is provided at the lower portion of the mixer.

[0058] A dosing system 100 of a multi-layer co-extrusion film forming device of the present embodiment is also provided with a bracket 119 and a frame platform 120, each of the multi-channel distribution pipes 106 is fixed on the bracket 119, each of the mixing storage bin assemblies 109 is respectively installed on the frame platform 120, and a bridge 121 for fixing and supporting the feed pipe 110 is provided on the frame platform 120 at a position above the mixing storage bin assembly 109.

[0059] Preferably, there are multiple multi-layer co-extrusion film forming devices, and the batching system 100 of the multi-layer co-extrusion film forming devices is a batching system used for multiple multi-layer co-extrusion film forming devices at the same time.

[0060] In this embodiment, the plurality of feeding stations 105 are divided into two groups and the two groups of feeding stations 105 are arranged in a left-right spacing manner; the bracket 119 for fixing the multi-channel distribution pipe 106 is arranged at the front position between the two groups of feeding stations 105.

[0061] Preferably, the plurality of feeding stations 105 may also be arranged in other ways, depending on the site conditions.

[0062] In this embodiment, the frame platform 120 is a double-layer frame platform having an upper platform 122 and a lower platform 123, the mixing storage bin assembly 109 is arranged on the upper platform 122, and the multi-layer co-extrusion film forming equipment and the screw extruder are arranged on the lower platform 123.

[0063] The use of the double-layer frame platform can make the layout more compact and facilitate the subsequent film blowing operation.

[0064] Preferably, the mixing storage bin assembly 109 further includes a manual loading hopper 124 connected to the upper portion of the storage bin 111 .

[0065] In this embodiment, the extrusion film production process of the multi-layer co-extrusion film production line 300 includes the following steps:

[0066] The raw materials from the feeding station 105 of the batching system 100 are distributed through the multi-channel distribution pipe 106 of the distribution center 102, and then transported to the mixed storage bin components 109 of the co-extrusion film feeding center 104 through the batching delivery pipeline 103. The mixed storage bin components 109 transport the prepared materials to the corresponding screw extruder 125. After the materials are batched, they are hot-melted and mixed in the screw extruder 125, and then sent into the co-extrusion film mold 301 at a higher pressure, and extruded at the die of the co-extrusion film mold 301 to form a hollow tube film 201 composed of multiple layers of different materials. The hollow tube film 201 enters the vacuum cooling cylinder 302 as a primary film bubble to cool and shape, and then is pulled and clamped by the first traction roller and comes out, and the tube film material is cross-linked by the irradiation cross-linking machine, and then air-cooled and shaped by the air-cooling knife 305, and then enters the water bath heating device 30 through the second traction roller 306. 7 is heated in a water bath. After being heated in a water bath, the tubular film 201 comes out from the third traction roller 308, is heated by the hot air knife 309 and the inflation heating device 310 in turn, is pulled by the fourth traction roller 311, and then passes through the cooling air ring 312. The tubular film 201 forms a secondary film bubble with built-in compressed air between the cooling air ring 312 and the fifth traction roller 203. Under the action of the compressed air inside the secondary film bubble, the wall thickness of the tubular film is reduced and the diameter is increased. After being pulled and clamped by the fifth traction roller 203, the tubular film 201 comes out from the sixth traction roller 314, and passes through the shaping heating device 315 and the air cooling device 316 in turn. The tubular film 201 forms a tertiary film bubble with built-in compressed air between the sixth traction roller 314 and the air cooling device 316. Under the action of the compressed air inside the tertiary film bubble, the wall thickness of the tubular film is further reduced, and the diameter is fine-tuned to the specified size. After being pulled and clamped by the seventh traction roller 317, it is rolled up by the winding device 318.

[0067] In this embodiment, the multi-layer co-extrusion film forming equipment 200 is provided with a secondary film bubble rupture rapid disposal device, and the secondary film bubble rupture rapid disposal device includes a tube film terminal sending station 204 whose initial position is set close to the rear end of the secondary film bubble in the direction of forward movement of the tube film 201 and is used to clamp the tube film 201 after the secondary film bubble ruptures and send it to the position of the pair of fifth traction rollers 203. The tube film terminal sending station 204 includes a moving mechanism 205 and a clamping module 206 arranged on the moving mechanism 205, and a pair of sending station clamps 208 arranged on the clamping module 206 for quickly clamping the tube film terminal 207 after the secondary film bubble 202 ruptures; a number of secondary film bubble rupture detection sensors 209 are circumferentially arranged on the periphery of the secondary film bubble 202 position for detecting whether the secondary film bubble is ruptured.

[0068] Preferably, the secondary bubble rupture detection sensor 209 is an ultrasonic distance measuring sensor. The diameter of the secondary bubble 202 can be measured by arranging a plurality of ultrasonic distance measuring sensors on the periphery of the secondary bubble 202. After the secondary bubble 202 ruptures, the diameter of the secondary bubble 202 decreases rapidly due to explosion and degassing, and may then be pulled apart by the fifth traction roller 203. Therefore, by measuring the change in the diameter of the secondary bubble 202, it is possible to determine whether the secondary bubble 202 is ruptured.

[0069] When the secondary film bubble ruptures, a pair of sending station clamps 208 can quickly clamp the tube film terminal 207 after the secondary film bubble ruptures, and quickly send the tube film terminal 207 to a position close to a pair of fifth traction rollers 203 through the moving mechanism 205; the pair of fifth traction rollers 203 will automatically open under the action of the control system of the extrusion film forming equipment when the secondary film bubble ruptures. At this time, the operator at the position of the pair of fifth traction rollers 203 can loosen the sending station clamps 208, take over the tube film terminal 207 and pass it through the pair of fifth traction rollers 203, and then use an inflation gun to inflate the tube film terminal 207, so as to re-form a secondary film bubble in the tube film 201. The size of the secondary film bubble is adjusted according to the detection of the secondary film bubble rupture detection sensor 209. After inflation is in place, the pair of fifth traction rollers 203 are closed again to clamp the tube film 201, and then other subsequent operations (such as connecting the tube film terminal 207 to the winding device, etc.) are performed.

[0070] In order to improve the automation of rapid disposal after secondary bubble rupture, further improvement plans are as follows:

[0071] In this embodiment, the pair of fifth traction rollers 203 are opening and closing type bubble squeezing traction rollers that can be loosened and closed. The tube film 201 is provided with a turning device after being output from between the pair of fifth traction rollers 203. A tube film terminal receiving station 210 for receiving the tube film terminal 207 sent from the tube film terminal sending station 204 to the position of the pair of fifth traction rollers 203 is also provided at the output end position close to and opposite to the pair of fifth traction rollers 203. The tube film terminal receiving station 210 includes a moving mechanism 205 and a clamping module 206 arranged on the moving mechanism 205, and a pair of receiving station clamps 211 arranged on the clamping module 206 for quickly clamping the rear end of the secondary film bubble when the secondary film bubble ruptures.

[0072] As one of the preferred solutions of the moving mechanism in this embodiment, the moving mechanism 205 used by the tube film terminal sending station 204 is a manipulator, and the clamping module 206 is arranged at the cantilever end of the manipulator.

[0073] As the second preferred solution of the moving mechanism in this embodiment, the moving mechanism 205 used by the tube film terminal sending station 204 is a linear moving mechanism, which includes a moving plate 212 moving in a linear direction, and the clamping module 206 is installed on the moving plate 212.

[0074] By setting the tube film terminal receiving station 210 in front of the pair of fifth traction rollers 203, the operator can remove the tube film terminal 207 from the pair of sending station clamps 208 and clamp it on the pair of receiving station clamps 211, and then move the tube film terminal 207 through the pair of fifth traction rollers 203 through the moving mechanism 205, thereby eliminating the need for the operator to perform the passing operation of the tube film terminal 207.

[0075] In order to further improve the automation of rapid disposal after secondary bubble rupture, further improvement plans are as follows:

[0076] Preferably, the pair of sending station clamps 208 located at the tube film terminal sending station 204 are detachably provided with a tube film automatic bubbler 213, and the tube film automatic bubbler 213 includes a pair of inflatable clamping blocks 214 detachably provided on the pair of sending station clamps 208 for clamping the tube film terminal 207, a pair of extension blocks 215 provided at the rear outer side of the inflatable clamping blocks 214 and extending toward the rear, and a pair of extension blocks 215 provided in the pair of extension blocks 215. An air blowing needle 216 for inflating the inside of the tube film terminal 207 is located on the inner side of one of the extension blocks 215, a pair of film suction cylinders 217 are located on both sides of the rear of the tube film terminal 207, and a vacuum suction cup 218 is located at the front end of the piston rod of the film suction cylinder 217. The pair of vacuum suction cups 218 of the pair of film suction cylinders 217 are located on both sides of the extension block 215; a detachable connection structure is provided between the inflation clamp 214 and the sending station clamp 208.

[0077] The inner side of the extension block 215 refers to the side directly facing the tubular membrane 201 .

[0078] Preferably, a pair of cutters 219 for shearing each other are provided at the front end of the pair of inflatable clamping blocks 214, so that the pair of inflatable clamping blocks 214 can clamp the tubular film terminal 207 while cutting off the excess tubular film waste adhering to the tubular film terminal 207.

[0079] Preferably, a multi-axis tubular film waste material taking-away multi-axis robotic arm (not shown) for taking away the cut excess tubular film waste is also provided on the frame of the extrusion film forming equipment, and a tubular film waste material taking-away suction cup is provided at the cantilever end of the robotic arm.

[0080] Preferably, the blowing needle 216 includes a blowing tube 220 for connecting to a compressed air source, a conical needle 221 transitionally connected to the end of the blowing tube 220, and a blowing hole 222 arranged on the outer circle of the front end of the blowing tube 220 or on the conical needle 221 and connected to the inner hole of the blowing tube 220; a compressed air inflation passage 223 is arranged inside the inflation clamp 214, and the blowing tube 220 of the blowing needle 216 is fixed on the inner side of the extension block 215 and is connected to the compressed air inflation passage 223 on the inflation clamp 214.

[0081] Preferably, the blowing hole 222 faces rearward of the moving direction of the tubular membrane 201 .

[0082] In this embodiment, the film suction cylinders 217 are installed on the moving plate 212 of the moving mechanism 205. There are two pairs (ie four) of film suction cylinders 217, and the two pairs of film suction cylinders 217 are placed on both sides of the tube film 201.

[0083] The working principle of the automatic tube film bubbler 213 in this embodiment is as follows: after the inflation clamp 214 clamps the tube film terminal 207, two pairs of film suction cylinders 217 arranged on the movable plate 212 drive the piston rods to approach the tube film 201 from both sides of the tube film 201 at the same time, so that the vacuum suction cups 218 at the ends of the piston rods of the film suction cylinders 217 on both sides correspondingly suck the two sides of the tube film 201, and then the piston rods of the film suction cylinders 217 retreat, thereby pulling open the flat tube film 201; when the tube film 201 is pulled open, the tube wall of the tube film 201 will move toward the blowing needle 216, so that the blowing needle 216 passively penetrates into the inside of the tube film 201; the control system of the extrusion film molding equipment can realize automatic bubbling of the tube film 201 by turning on the compressed air source.

[0084] In this embodiment, the detachable connection structure between the inflatable clamp block 214 and the sending station clamp 208 is as follows: a pair of first positioning pins 224 are provided on the side of the inflatable clamp block 214 that abuts against the sending station clamp 208, and a pair of first positioning holes are correspondingly provided on the side of the sending station clamp 208 that abuts against the inflatable clamp block 214. The pair of first positioning pins 224 on the inflatable clamp block 214 are correspondingly inserted into the pair of first positioning holes, and the planes between the inflatable clamp block 214 and the sending station clamp 208 are abutted against each other.

[0085] Preferably, a guiding cone surface is provided at the end of the first positioning pin 224 .

[0086] It should be particularly pointed out that the first positioning pin 224 can also be set on the sending station clamp 208, and the first positioning hole can be set on the inflatable clamp block 214, which can also realize a detachable connection structure between the inflatable clamp block 214 and the sending station clamp 208.

[0087] Preferably, one of a pair of connecting surfaces between the inflatable clamp block 214 and the sending station clamp 208 is a magnet surface and the other is a steel plate surface, so that the inflatable clamp block 214 and the sending station clamp 208 can attract each other after being positioned and connected without dispersing, and can still maintain the separable structural characteristics.

[0088] In this embodiment, an automatically inflated sending-end docking air circuit structure is also provided between the sending station chuck 208 and the inflatable clamp block 214, and the sending-end docking air circuit structure is as follows: a first compressed air receiving hole 225 connected to the compressed air inflation passage 223 is provided on the outer end face of the inflatable clamp block 214, and an inflation one-way valve 226 is provided in the first compressed air receiving hole 225; an inflation docking air circuit 227 is provided on the sending station chuck 208 and is docked and connected to the first compressed air receiving hole 225 of the inflatable clamp block 214, and the inflation docking air circuit 227 is connected to an external compressed air source through an inflation pipeline.

[0089] Preferably, a first overload pressure relief hole 228 connected to the compressed air charging passage 223 is also provided on the outer end face of the inflatable clamp 214, and an exhaust check valve 229 is provided in the first overload pressure relief hole 228; a first overload pressure relief docking air path 230 that is docked and connected to the first overload pressure relief hole 228 of the inflatable clamp 214 is provided on the sending station clamp 208.

[0090] More preferably, the first overload pressure relief docking air circuit 230 is externally connected to a vacuum hole device through an overload pressure relief pipeline, which can speed up the overload pressure relief speed and can also be used to unload part of the air inside the secondary membrane bubble when the secondary membrane bubble size is too large due to excessive inflation, thereby controlling the secondary membrane bubble size within a predetermined range.

[0091] By setting the above-mentioned automatic tube film bubbler 213, it is possible to achieve full inflation of the interior of the tube film 201 during the process of the tube film terminal 297 moving toward a pair of fifth traction rollers 203, thereby not only eliminating the need for manual inflation, but also improving the efficiency of rapid disposal of secondary film bubble rupture.

[0092] In order to further improve the automation of rapid disposal after secondary bubble rupture, further improvement plans are as follows:

[0093] In this embodiment, a detachable connection structure is provided between the inflatable clamp block 214 and the receiving station clamp 211, and the detachable connection structure between the inflatable clamp block 214 and the receiving station clamp 211 is as follows: a pair of second positioning pins 231 are provided on the side of the inflatable clamp block 214 that abuts against the receiving station clamp 211, and a pair of second positioning holes are correspondingly provided on the side of the receiving station clamp 211 that abuts against the inflatable clamp block 214. The pair of second positioning pins 231 on the inflatable clamp block 214 are correspondingly inserted into the pair of second positioning holes, and the planes between the inflatable clamp block 214 and the receiving station clamp 211 are abutted against each other.

[0094] Preferably, a guiding cone surface is provided at the end of the second positioning pin 231 .

[0095] It should be particularly pointed out that the second positioning pin 231 can also be set on the receiving station clamp 211, and the second positioning hole can be set on the inflatable clamp block 214, which can also realize a detachable connection structure between the inflatable clamp block 214 and the receiving station clamp 211.

[0096] Preferably, in order to achieve precise docking, a docking distance sensor 235 for detecting the distance between the sending station chuck and the receiving station chuck is further provided on the sending station chuck 208 or the receiving station chuck 211 .

[0097] In this embodiment, an automatically inflated receiving end docking air path structure is also provided between the receiving station chuck 211 and the inflatable clamp block 214, and the receiving end docking air path structure is as follows: a second compressed air receiving hole 232 connected to the compressed air inflation passage 223 is provided on the outer end face of the inflatable clamp block 214, and an inflation one-way valve 226 is provided in the second compressed air receiving hole 232; an inflation docking air path 227 is provided on the receiving station chuck 211, and the inflation docking air path 227 is connected to an external compressed air source through an inflation pipeline.

[0098] By providing a detachable connection structure between the inflation clamp block 214 and the receiving station clamp 211, and also providing an automatically inflated receiving end docking gas path structure between the receiving station clamp 211 and the inflation clamp block 214, continuous inflation of the tube film 201 can be achieved after the tube film terminal 207 passes through a pair of fifth traction rollers 203. During the continuous inflation process, the tube film terminal sending station 204 can quickly move and reset to the initial position after transferring a pair of inflation clamp blocks 214 to the tube film terminal receiving station 210, so that the tube film 201 can realize the closing and resetting of a pair of fifth traction rollers 203 in time after being inflated, so as to re-form the secondary film bubble 202 required for the extrusion film forming process, thereby further improving the automation of rapid disposal after the secondary film bubble ruptures.

[0099] Preferably, a second overload pressure relief hole 233 connected to the compressed air charging passage 223 is also provided on the outer end face of the inflatable clamp 214, and an exhaust check valve 229 is provided in the second overload pressure relief hole 233; a second overload pressure relief docking air path 234 which is docked and connected to the second overload pressure relief hole 233 of the inflatable clamp 214 is provided on the receiving station clamp 211.

[0100] More preferably, the second overload pressure relief docking air circuit 234 is connected to an external extraction hole device through the overload pressure relief pipeline, which can speed up the overload pressure relief speed, and can also be used to unload part of the air inside the secondary film bubble when the secondary film bubble is too large due to excessive inflation, thereby controlling the size of the secondary film bubble within a predetermined range; moreover, after the inflation is in place and a pair of fifth traction rollers 203 clamp the tube film 201 to form a stable secondary film bubble, the excess air inside the tube film pulled by the fifth traction roller 203 can be discharged through the extraction hole device, thereby greatly facilitating other subsequent operations, such as directly connecting to the winding device (suitable for direct winding after the secondary film bubble is formed), or passing the tube film terminal through the next pair of bubble squeezing traction rollers for re-bubble making operation (suitable for re-bubble making operation after the secondary film bubble is formed).

[0101] This embodiment can effectively prevent the secondary membrane bubble from rupturing during the bubble making process due to excessive automatic inflation by arranging the first overload pressure relief hole 228 and the second overload pressure relief hole 233 on the inflation clamp 214, and has good safety. In addition, the first overload pressure relief hole 228 or the second overload pressure relief hole 233 can also be used to adjust the size of the secondary membrane bubble after being connected to the vacuum extraction device, so that the size of the over-inflated secondary membrane bubble can be restored to the set value, thereby further improving the dimensional accuracy of the secondary membrane bubble.

[0102] A method for quickly dealing with secondary film bubble rupture in an extrusion film forming device comprises the following steps:

[0103] S1. Secondary film bubble monitoring: The control system of the extrusion film forming equipment obtains the secondary film bubble status through the secondary film bubble rupture detection sensor 209 located on the periphery of the secondary film bubble 202;

[0104] S2. Clamping the tube film terminal: When the secondary film bubble rupture detection sensor 209 detects that the secondary film bubble 202 is ruptured, a pair of sending station clamps 208 located on the tube film terminal sending station 204 immediately actuates, driving a pair of inflatable clamps 214 on a pair of sending station clamps 208 to close, thereby clamping the tube film terminal 207 after the secondary film bubble is ruptured;

[0105] S3, cutting and cleaning of the tubular film terminal: while the pair of inflatable clamping blocks 214 are closed, the cutter 219 located at the front end of the pair of inflatable clamping blocks 214 cuts off the excess tubular film waste adhered to the tubular film terminal 207; after the excess tubular film waste on the tubular film terminal 207 is cut off, the tubular film waste taking multi-axis robot arm takes away the cut excess tubular film waste;

[0106] S4, synchronous rapid post-processing after cutting and cleaning of tube film terminals: It includes the following contents:

[0107] (1) Inflation of the tube film terminal: The two pairs of film suction cylinders 217 located on both sides of the rear part of the tube film terminal 207 are turned on, and the vacuum suction cups 218 on the piston rods of the film suction cylinders 217 suck the flat tube film 201 from both sides and pull the tube film 201 apart; when the tube film 201 is pulled apart, the tube wall of the tube film 201 moves toward the blowing needle 216 on the inflation clamp 214, so that the blowing needle 216 passively penetrates into the tube film 201; after the tube film 201 is in place, the control system of the extrusion film forming equipment turns on the compressed air source, and the compressed air enters the blowing needle 216 for blowing, thereby realizing automatic bubbling of the tube film 201;

[0108] (2) Movement of the tube film terminal: while the tube film terminal 207 is inflated, the moving mechanism 205 located at the tube film terminal sending station 204 is actuated to send the tube film terminal 207 to a pair of fifth traction rollers 203;

[0109] (3) Tube film terminal relay and inflation: When the tube film terminal 207 moves, the control system opens the pair of fifth traction rollers 203, and then the moving mechanism 205 located at the tube film terminal receiving station 210 is activated. The pair of receiving station clamps 211 on the tube film terminal receiving station 210 move toward the pair of fifth traction rollers 203 and pass through the pair of fifth traction rollers 203, and then further move to the inflation clamp 214 located on the pair of sending station clamps 208 and contact with the inflation clamp 214. The pair of receiving station clamps 211 are opened to clamp the inflation clamp 214 in place. After it is in place, the pair of sending station clamps 208 are released, thereby completing the transfer of the inflation clamp 214 from the tube film terminal sending station 204 to the tube film terminal receiving station 210; after the transfer of the inflation clamp 214 is completed, the tube film terminal receiving station 210 provides compressed air to continue the inflation operation; the tube film terminal sending station 204 that has completed the inflation operation is reset to the initial position through its moving mechanism 205;

[0110] (4) The tube film terminal passes through a pair of fifth traction rollers: While the tube film terminal 207 is relayed and inflated, the tube film terminal receiving station 210 is reset to the initial position through its moving mechanism 205. During the process of the tube film terminal receiving station 210 being reset to the initial position, the receiving station clamp 211 on the tube film terminal receiving station 210 drives the tube film terminal 207 to pass through the pair of fifth traction rollers 203;

[0111] S4, fifth traction roller clamping and resetting: after the tube film terminal 207 passes through a pair of fifth traction rollers 203, the control system drives the pair of fifth traction rollers 203 to close and reset, thereby forming a secondary film bubble 202 required for the extrusion molding process in a section of the tube film 201 between the initial position of the tube film terminal sending station 204 and the pair of fifth traction rollers 203; the size of the secondary film bubble 202 is obtained by the control system controlling the inflation amount during the inflation process according to the detection data of the secondary film bubble rupture detection sensor 209.

[0112] Preferably, after the fifth traction roller is clamped and reset in step S4, the control system also quickly removes the air in a section of the tube film 201 between the pair of fifth traction rollers and the pair of inflatable clamps 214 through a vacuum device configured at the tube film terminal receiving station 210, so as to facilitate further subsequent treatment operations. For example, the tube film terminal 207 is connected to a winding device, etc.

[0113] Preferably, the secondary film bubble rupture rapid disposal device in this embodiment can also be applied to the bubble making operation during the initial operation of the extrusion film forming equipment. The specific method is to set the tube film terminal sending station 204 at the position of the cooling air ring 236, and the setting position of the tube film terminal receiving station 210 remains unchanged; after the tube film 201 of the extrusion film forming equipment comes out of the cooling air ring 236, immediately start the secondary film bubble rupture rapid disposal device, so that the pair of sending station clamps 208 located on the tube film terminal sending station 204 immediately move, drive the pair of inflatable clamps 214 on the pair of sending station clamps 208 to close, thereby clamping the tube film terminal 207 coming out of the cooling air ring 236; the subsequent operation steps after the tube film terminal 207 is clamped are the same as the operation steps after the tube film terminal is clamped after the secondary film bubble ruptures.

[0114] Preferably, the linear moving mechanism used by the tube film terminal sending station 204 can adopt a linear guide rail, and the moving plate 212 is installed on a slide seat of the linear guide rail, and the slide seat is connected to a screw transmission mechanism driven by a servo reduction motor.

[0115] Preferably, the linear moving mechanism used by the tube film terminal receiving station 210 can adopt a servo electric push rod, and the receiving station clamp 211 is set at the end of the telescopic rod of the servo electric push rod.

[0116] Preferably, the clamping module 206 used in the tube film terminal sending station 204 adopts a pair of synchronous telescopic cylinders, and the pair of sending station clamps 208 are correspondingly arranged at the ends of the piston rods of a pair of synchronous telescopic cylinders. The synchronous telescopic cylinders are fixed on the movable plate 212 and are arranged on both sides of the secondary film bubble. The movable plate 212 is provided with an inner hole for the secondary film bubble 202 to pass through.

[0117] Preferably, the synchronous telescopic cylinder adopts a multi-axis cylinder.

[0118] In this embodiment, when the tube film blowing process of the extrusion film forming equipment adopts an upward blowing or downward blowing process, the movable plate 212 is actually a lifting movable plate.

[0119] Preferably, the clamping module 206 used in the tube film terminal receiving station 210 adopts a finger cylinder with its finger direction pointing to a pair of fifth traction rollers 203, and a pair of air claws of the finger cylinder serve as the pair of receiving station clamps 211.

[0120] As a further improvement of the present embodiment, a movable guide rail assembly 319 is provided at an upper position between the fifth traction roller 203 and the sixth traction roller 314, and a movable mechanism of the tube film terminal receiving station 210 is installed on the movable guide rail assembly 319, which can realize the movement of the tube film terminal receiving station 210 from a position directly above the pair of fifth traction rollers 203 to a position directly above the pair of sixth traction rollers 314; in this way, when the secondary bubble making is completed (the pair of fifth traction rollers have been closed and clamped), the tube film terminal receiving station 210 can continue to move to a position directly above the pair of sixth traction rollers 314 by clamping the tube film terminal 207 through the inflatable clamp block 214, and then open the pair of sixth traction rollers 314, and pass the tube film terminal 207 downward through the pair of sixth traction rollers 314, so as to facilitate the subsequent tertiary bubble making operation. When the tube film terminal receiving station 210 moves toward the pair of sixth traction rollers 314 , the vacuum device of the tube film terminal receiving station 210 can be simultaneously turned on to exhaust the gas in the film tube.

[0121] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-layer co-extrusion film production line using automatic batching, characterized in that: It includes a multi-layer co-extrusion film forming device and a batching system connected to the multi-layer co-extrusion film forming device; the multi-layer co-extrusion film forming device includes a co-extrusion film mold, a vacuum cooling cylinder, a first traction roller, an irradiation chain machine, an air cooling knife, a second traction roller, a water bath heating device, a third traction roller, a hot air knife, a blowing heating device, a fourth traction roller, a cooling air ring, a fifth traction roller, a sixth traction roller, a shaping heating device, an air cooling device, a seventh traction roller and a winding device which are arranged in sequence according to the production process of the multi-layer co-extrusion film; the batching system includes a feeding center, a material distribution center, a material conveying pipeline and a co-extrusion film feeding center which are arranged accordingly according to the batching process; the feeding center includes a number of feeding stations; the material distribution center includes A number of multi-channel distribution pipes, wherein the multi-channel distribution pipes include a feed pipe and a plurality of discharge pipes connected to the feed pipe, wherein the feed pipe on the multi-channel distribution pipe is connected to one of the feed stations in the feeding center; the co-extrusion film feeding center includes a number of screw extruders connected to the co-extrusion film mold for realizing multi-layer film co-extrusion, and a number of mixing storage bin assemblies for feeding each of the screw extruders; the ingredient delivery pipeline includes a delivery pipe assembly composed of a number of delivery pipes connected to each of the mixing storage bin assemblies, and each delivery pipe in the same delivery pipe assembly is respectively connected to the discharge pipes belonging to different multi-channel distribution pipes in the material distribution center; The multi-layer co-extrusion film forming equipment is provided with a secondary film bubble rupture rapid disposal device, the secondary film bubble rupture rapid disposal device comprises a tube film terminal sending station whose initial position is arranged near the rear end position of the secondary film bubble according to the direction of the tube film moving forward, and is used to clamp the tube film after the secondary film bubble ruptures and send it to a pair of fifth traction roller positions, the tube film terminal sending station comprises a moving mechanism and a clamping module arranged on the moving mechanism, and a pair of sending station clamps arranged on the clamping module for quickly clamping the tube film terminal after the secondary film bubble ruptures; a number of secondary film bubble rupture detection sensors for detecting whether the secondary film bubble is ruptured are arranged circumferentially on the periphery of the secondary film bubble position; The moving mechanism used in the tube film terminal sending station is a linear moving mechanism, which includes a moving plate that moves in a linear direction, and the clamping module is installed on the moving plate; an automatic tube film bubbler is detachably provided on the pair of sending station chucks located at the tube film terminal sending station, and the automatic tube film bubbler includes a pair of inflation clamps that are correspondingly and detachably provided on the pair of sending station chucks for clamping the tube film terminal, a pair of extension blocks that are provided at the rear outer side of the inflation clamps and extend toward the rear, an air blowing needle that is provided at the inner side of one of the pair of extension blocks for inflating the inside of the tube film terminal, a pair of film suction cylinders that are provided at both sides of the rear of the tube film terminal, and a vacuum suction cup that is provided at the front end of the piston rod of the film suction cylinder, and a pair of vacuum suction cups of the pair of film suction cylinders are respectively arranged on both sides of the extension block; a detachable connection structure is provided between the inflation clamps and the sending station chuck.

2. A multi-layer co-extrusion film production line using automatic batching according to claim 1, characterized in that: The extrusion film production process of the multi-layer co-extrusion film production line includes the following steps: The raw materials from the batching system feeding station are distributed through the multi-channel distribution pipes of the distribution center, and then transported to the mixed storage bin components of the co-extrusion film feeding center through the batching delivery pipeline. The mixed storage bin components transport the prepared materials to the corresponding screw extruder. After the materials are batched, they are hot-melted and mixed in the screw extruder, and then sent into the co-extrusion film mold by pressure, and extruded at the die of the co-extrusion film mold to form a hollow tube film composed of multiple layers of different materials. The hollow tube film enters the vacuum cooling cylinder as a primary film bubble to cool and shape, and then is pulled and clamped by the first traction roller and comes out. The tube film material is cross-linked by the irradiation cross-linking machine, and then air-cooled and shaped by the air-cooling knife, and then enters the water bath heating device through the second traction roller. Water bath heating is carried out, and the tubular film comes out from the third traction roller after being heated in the water bath, and is heated by the hot air knife and the inflation heating device in turn, and is pulled by the fourth traction roller and then passes through the cooling air ring. The tubular film forms a secondary film bubble with built-in compressed air between the cooling air ring and the fifth traction roller. Under the action of the compressed air inside the secondary film bubble, the wall thickness of the tubular film is reduced and the diameter becomes larger. After being pulled and clamped by the fifth traction roller, the tubular film comes out through the sixth traction roller, and passes through the shaping heating device and the air cooling device in turn. The tubular film forms a tertiary film bubble with built-in compressed air between the sixth traction roller and the air cooling device. Under the action of the compressed air inside the tertiary film bubble, the wall thickness of the tubular film is further reduced, and the diameter is fine-tuned to the specified size. After being pulled and clamped by the seventh traction roller, it is rolled up by the winding device.

3. A multi-layer co-extrusion film production line with automatic batching according to claim 1, characterized in that: The pair of fifth traction rollers are opening and closing type bubble squeezing traction rollers that can be loosened and closed. The tube film is provided with a turning device after being output from between the pair of fifth traction rollers. A tube film terminal receiving station for receiving the tube film terminals sent from the tube film terminal sending station to the position of the pair of fifth traction rollers is also provided near and opposite to the output end of the pair of fifth traction rollers. The tube film terminal receiving station includes a moving mechanism and a clamping module arranged on the moving mechanism, and a pair of receiving station clamps arranged on the clamping module for quickly clamping the rear end of the secondary film bubble when the secondary film bubble ruptures.

4. A multi-layer co-extrusion film production line using automatic batching according to claim 3, characterized in that: The air blowing needle comprises an air blowing tube for connecting with a compressed air source, a conical needle transitionally connected to the end of the air blowing tube, and an air blowing hole arranged on the outer circle of the front end of the air blowing tube or on the conical needle and connected to the inner hole of the air blowing tube; a compressed air inflation passage is arranged inside the inflatable clamping block, and the air blowing tube of the air blowing needle is fixed on the inner side of the extension block and is connected to the compressed air inflation passage on the inflatable clamping block.

5. A multi-layer co-extrusion film production line using automatic batching according to claim 4, characterized in that: The detachable connection structure between the inflatable clamp block and the sending station clamp is as follows: a pair of first positioning pins are provided on the side of the inflatable clamp block that abuts against the sending station clamp, and a pair of first positioning holes are correspondingly provided on the side of the sending station clamp that abuts against the inflatable clamp block. The pair of first positioning pins on the inflatable clamp block are correspondingly inserted into the pair of first positioning holes, and the planes between the inflatable clamp block and the sending station clamp are abutted against each other.

6. A multi-layer co-extrusion film production line using automatic batching according to claim 5, characterized in that: An automatically inflated sending-end docking air circuit structure is also provided between the sending station chuck and the inflatable clamp block, and the sending-end docking air circuit structure is as follows: a first compressed air receiving hole connected to the compressed air inflation passage is provided on the outer end face of the inflatable clamp block, and an inflation one-way valve is provided in the first compressed air receiving hole; an inflation docking air circuit is provided on the sending station chuck, which is docked and connected to the first compressed air receiving hole of the inflatable clamp block, and the inflation docking air circuit is connected to an external compressed air source through an inflation pipeline.

7. The multi-layer co-extrusion film production line using automatic batching according to claim 3, characterized in that: A detachable connection structure is provided between the inflatable clamp block and the receiving station clamp, and the detachable connection structure between the inflatable clamp block and the receiving station clamp is as follows: a pair of second positioning pins are provided on a side of the inflatable clamp block that abuts against the receiving station clamp, and a pair of second positioning holes are correspondingly provided on a side of the receiving station clamp that abuts against the inflatable clamp block, the pair of second positioning pins on the inflatable clamp block are correspondingly inserted into the pair of second positioning holes, and the planes between the inflatable clamp block and the receiving station clamp are abutted against each other.

8. The multi-layer co-extrusion film production line using automatic batching according to claim 4, characterized in that: An automatically inflated receiving end docking air circuit structure is also provided between the receiving station chuck and the inflatable clamp block, and the receiving end docking air circuit structure is as follows: a second compressed air receiving hole connected to the compressed air inflation passage is provided on the outer end face of the inflatable clamp block, and an inflation one-way valve is provided in the second compressed air receiving hole; an inflation docking air circuit is provided on the receiving station chuck, which is docked and connected to the second compressed air receiving hole of the inflatable clamp block, and the inflation docking air circuit is connected to an external compressed air source through an inflation pipeline.

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