CN115056448B

CN115056448B - Extruder for producing constant-extrusion polylactic acid breathable film and application method thereof

Info

Publication number: CN115056448B
Application number: CN202210985857.8A
Authority: CN
Inventors: 李宙; 高峰
Original assignee: Suzhou Pulaian Polymer Materials Co ltd
Current assignee: Suzhou Pulaian Polymer Materials Co ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2022-11-08
Anticipated expiration: 2042-08-17
Also published as: CN115056448A

Abstract

The invention discloses an extruder for producing a constant-extrusion polylactic acid breathable film and a using method thereof. According to the invention, when the screw rod and the reciprocating threaded rod rotate, the screw rod drives the fixed movable cleaning rod to rotate, the movable cleaning rod drives the rotating ring to rotate, the rotating ring reciprocates outside the reciprocating threaded rod, the distance between two ends of the movable cleaning rod is continuously changed, the included angle between the middle parts of the movable cleaning rods is continuously changed, the rotating cleaning rods are acted by the rotating centrifugal force of the movable cleaning rods, the rotating cleaning rods are enabled to turn outwards, the effect of performing spiral stirring on the material spraying nozzle is realized, the stirring degree is greatly improved, the stirring radius is improved by rotating the cleaning rods, and the problem of blockage of the material spraying nozzle is avoided.

Description

Extruder for producing constant-extrusion polylactic acid breathable film and application method thereof

Technical Field

The invention relates to the technical field of plastic processing, in particular to an extruder for producing a constant-extrusion polylactic acid breathable film and a using method thereof.

Background

The polylactic acid is also called polylactide, takes starch-containing organisms such as corn, wheat, cassava and the like as initial raw materials, obtains glucose through enzymatic decomposition, becomes lactic acid through lactic acid bacteria fermentation, and finally obtains the biodegradable thermoplastic polyester through chemical combination.

In the prior art, for example, chinese patent application CN113954331A is an extrusion device for a BOPP film, which includes a frame, an upper surface of the frame is fixedly connected with an installation block, an upper surface of the installation block is fixedly connected with a cooling layer, a surface of the cooling layer close to the right is fixedly connected with a fixing ring, and a surface of the fixing ring close to the back is fixedly connected with a connection block. This an extruder for BOPP membrane, through rotating the fixed block, pull the extrusion door, rotate and open under the drive of dwang and connecting block, then promote the connecting rod through pressing down, release the position of extrusion door with the stirring roller, the clean up is taken out in the aspect dismantlement, avoid influencing the inhomogeneous quality problems that appear of next time material mixing, then put into the material jar with the stirring roller, will extrude a gyration normal position through the rotation of dwang, then the rotation is fixed the fixed block and is reached and extrude the unable pivoted purpose of door, the installation playback finishes, simple structure installs very conveniently, work burden has been alleviateed.

However, in the prior art, the polylactic acid preparation film is heated to two hundred or more degrees centigrade to melt, and when the material is extruded and discharged, the quality of the formed film is caused due to the uneven temperature distribution inside the charging barrel, and possibly, due to the uneven temperature distribution, a narrow discharge port is blocked after the solidification of partial material, so that the volume of the discharge port is small, and the traditional stirring device cannot fully stir at the small and complex-shaped discharge port.

In the stirring of traditional extruder, the material spraying mouth adopts the frustum form usually to make the tamped more mutually of spun material, nevertheless when mixing, the material in the material spraying mouth leads to the stirring piece can't carry out effectual stirring to the material in the material spraying mouth and mixes because the interference of its shape, and the material uniformity that causes in the material spraying mouth is lower, leads to the membrane of extruding in earlier stage of extruder because the composition proportion is maladjusted and the quality is not up to standard.

Disclosure of Invention

The invention aims to provide an extruder for producing a constant-extrusion polylactic acid breathable film and a using method thereof, and aims to solve the problems that when a film is prepared by polylactic acid, which is provided by the background art, the film can be melted only by heating to two hundred or more ℃, and then is extruded and discharged, the film forming quality is caused by nonuniform temperature distribution in a charging barrel, and a narrow discharge port is blocked after partial materials are solidified due to nonuniform temperature distribution, the volume of the discharge port is small, and the traditional stirring device cannot fully stir at the discharge port with small volume and complex shape.

In order to achieve the purpose, the invention provides the following technical scheme: an extruder for producing a constant-extrusion polylactic acid breathable film comprises a feeding mechanism and an extruding mechanism, wherein the feeding mechanism comprises a positioning frame, the positioning frame is fixedly connected with a winding mechanism, the top end of the positioning frame is fixedly connected with a reaction tank, the bottom end of the reaction tank is fixedly connected with a funnel, slots are formed in positions above and below the side surface of the reaction tank, the side surface of the reaction tank is positioned at two slot positions and is respectively connected with a sliding door in a sliding manner, two heating rods are fixedly connected between two inner side walls of the reaction tank, the inner side walls of the reaction tank are fixedly connected with a fixed table, the top surface of the fixed table is fixedly connected with a drying tower, the bottom end of the funnel is provided with a stirring assembly, the stirring assembly comprises a motor base a, the motor base a is fixedly connected with the positioning frame, the top surface of the motor base a is fixedly connected with a motor a, a material conveying pipe is arranged above the motor a, the material conveying pipe is rotatably connected with a spiral plunger, the spiral plunger and the output end of the spiral plunger and the motor a is fixedly connected with a driving wheel a, the outer side wall of the two driving belt is fixedly connected with a material pipe, and the bottom end of the driving wheel a far away from one end of the driving belt is fixedly connected with a driving wheel;

the extrusion mechanism comprises a motor b and a material cylinder, wherein a material spraying nozzle is fixedly connected to one end of the material cylinder, which is far away from the motor b, the motor b and the material spraying nozzle are of a shell structure with an opening on one side, a spiral rod is fixedly connected to the output end of the motor b, a pressing cover is in threaded connection with the outer side wall of the spiral rod, two U-shaped limit blocks are fixedly connected to the side wall of the pressing cover, two limit grooves are formed in the inner side wall of the material cylinder, the U-shaped limit blocks are in sliding connection with the limit grooves, a vibration fixture block b is in sliding connection with the outer part of each U-shaped limit block, a plurality of vibration fixture blocks a are movably connected between the vibration fixture blocks a and the two side walls of the limit grooves, two stirring fan blades are fixedly connected to the outer side wall of one end of the material cylinder, a plurality of direction limiting blocks are fixedly connected between the two side walls of the stirring fan blades, a plurality of direction limiting blocks are fixedly connected to the inner part of the material guiding opening, a plurality of direction limiting blocks are fixedly connected between the side walls of the guiding opening, a reciprocating screw rod connecting seat is fixedly connected with a spiral rod connecting seat, a reciprocating screw rod is connected with a reciprocating threaded rod connecting seat, and a reciprocating screw rod connecting seat is arranged between the reciprocating rod connecting seat, and a reciprocating screw rod connecting seat is connected with a reciprocating screw rod connecting seat, and a reciprocating rod connecting seat, a reciprocating screw rod connecting seat are arranged on the reciprocating rod connecting seat, and fixed connection between the connecting seat that activity clearance pole one end links to each other and the hob lateral wall, fixed connection between the connecting seat that the activity clearance pole other end links to each other and the lateral wall of swivel ring, the lateral wall of activity clearance pole all rotates and is connected with and rotates the clearance pole, fixed connection between the bottom of discharge gate and the lateral wall of feed cylinder, motor b's bottom fixedly connected with motor cabinet b, equal fixedly connected with support column an of two turning positions of motor cabinet b's bottom and four turning positions departments of the bottom of feed cylinder, the outside of the adjacent material nozzle one end of extrusion mechanism has set gradually curtain coating forming mechanism, roll forming mechanism and winding mechanism.

Preferably, one end of the extrusion mechanism adjacent to the material spraying nozzle is provided with a tape casting mechanism, the tape casting mechanism comprises a motor c and two driving wheels b, the side walls of the two driving wheels b are in transmission connection with driving belts b, the outer side walls of the two ends of the two driving wheels b are in rotation connection with supports, and the bottom ends of the supports are fixedly connected with the bottom plate.

Preferably, fixed connection between the output of motor c and the lateral wall of adjacent extrusion mechanism's drive wheel b, fixed connection between motor c's the bottom and the support, the top surface top of drive belt b is provided with scrapes the subassembly, it includes the locating plate to scrape the subassembly, fixed connection between two lower margins of locating plate and the bottom plate, the side sliding connection of locating plate has the scraper blade, a plurality of locating holes have been seted up to the lateral wall of locating plate, the lateral wall sliding connection of scraper blade has the location bolt, the location bolt with the locating hole grafting is in order to be used for scraper blade fixed mounting be in on the locating plate.

Preferably, one end, far away from the extrusion mechanism, of the transmission belt b is provided with a ventilation detection assembly, the ventilation detection assembly comprises an axial flow fan, four corner positions at the bottom end of the axial flow fan are fixedly connected with supporting columns b, the supporting columns b are fixedly connected with a bottom plate, a windmill is arranged above the axial flow fan, the top end of the windmill is rotatably connected with a windmill seat, and the ground feet of the windmill seat are fixedly connected with the bottom plate.

Preferably, the roll-in forming mechanism includes motor cabinet c and roll-in seat, it is connected with two compression rollers to rotate between two inside walls of roll-in seat, and the one end fixedly connected with motor cabinet c of roll-in seat, the lateral wall fixedly connected with motor d of motor cabinet c, motor d's output runs through fixed connection between motor cabinet c and the roll-in seat and a compression roller.

Preferably, one end of the compression roller, which is far away from the motor d, penetrates through the side wall of the compression roller seat and is fixedly connected with a transmission gear, the transmission gear is meshed with the transmission gear, and support columns c are fixedly connected to four corners of the bottom surface of the compression roller seat.

Preferably, winding mechanism is including location curb plate and two activity curb plates, be provided with the wind-up roll between location curb plate and the activity curb plate, two be provided with the activity location handle between the activity curb plate, the activity location handle includes two handle seats, fixed connection between handle seat and the activity curb plate, two equal fixedly connected with in the adjacent one side of handle seat slide the outer post, two the inside sliding connection of outer post that slides has the slip inner prop.

Preferably, the one end of wind-up roll rotates between the curb plate with the location to be connected, rotate the joint between the other end of wind-up roll and the activity curb plate, activity curb plate one side fixedly connected with motor cabinet d is kept away from to the location curb plate.

Preferably, the lateral wall fixedly connected with motor e of motor cabinet d, motor e's output run through motor cabinet d and the lateral wall of location curb plate and with wind-up roll between fixed connection, the bottom fixedly connected with backup pad of location curb plate, sliding connection between activity curb plate and the backup pad, four turning position departments of bottom surface of activity curb plate all fixedly connected with support column d.

A use method of an extruder for producing a constant-weight extruded polylactic acid breathable film comprises the following steps:

step one, opening a sliding door at the upper end, introducing materials into a reaction tank, closing the sliding door to enable the materials to react, drying the interior of the reaction tank by a drying tower, starting a heating rod to heat the materials to melt the materials in the reaction tank, opening a sliding door at the lower end to enable the materials to flow into a material conveying pipe through a funnel, starting a motor a to drive a spiral plunger to rotate through transmission between a driving wheel a and a driving belt a, and stirring the materials in the material conveying pipe by the spiral plunger and pushing the materials to a discharge port;

secondly, the material flows into the material barrel from the discharge port, the motor b is started to drive the screw rod to rotate, the screw rod drives the extrusion cover to slide along the limiting groove, the vibration clamping block a and the vibration clamping block b are in contact extrusion and separated extension, so that the pagoda spring a and the pagoda spring b generate vibration on the side wall of the material barrel, two stirring blades on two sides of the port of the screw rod rotate and stir, the screw rod and the reciprocating threaded rod rotate, the extrusion cover slides to reduce the internal volume of the material barrel, and the material flows out of the material spraying nozzle;

when the spiral rod and the reciprocating threaded rod rotate, the spiral rod drives the fixed movable cleaning rod to rotate, the movable cleaning rod drives the rotating ring to rotate, the rotating ring reciprocates outside the reciprocating threaded rod, the distance between two ends of the movable cleaning rod is continuously changed, the included angle in the middle of the movable cleaning rod is continuously changed, and the rotating cleaning rod is acted by the rotating centrifugal force of the movable cleaning rod to enable the rotating cleaning rod to turn outwards;

when the stirring fan blades rotate, the materials flow through the other end from one end of the material guide port, when the materials flow in from the large port of the direction limiting block, the materials flow into the small port along the large port of the direction limiting block and flow into the large port of the next direction limiting block to form a shaping cycle, when the materials flow in from the small port of the direction limiting block, the materials flow into the large port along the small port, when the materials flow through the small port of the next direction limiting block, the aperture of the anti-blocking holes on the two outer sides is larger than that of the small port of the direction limiting block, so that the materials flow out from the anti-blocking holes, and reverse circulation is avoided;

and fifthly, the material flows onto the transmission belt b from the material spraying nozzle, the scraper blade scrapes the film, the windmill starts the axial flow fan above the film to rotate, the distance between the scraper blade and the transmission belt b is adjusted through the rotation degree of the axial flow fan, the position is fixed through the positioning bolt, the material is transported between two compression rollers through the transmission belt b, and finally the material is wound on a winding roller.

Compared with the prior art, the invention has the beneficial effects that:

1. in the invention, when the screw rod and the reciprocating threaded rod rotate, the screw rod drives the fixed movable cleaning rod to rotate, the movable cleaning rod drives the rotating ring to rotate, the rotating ring reciprocates outside the reciprocating threaded rod, the distance between two ends of the movable cleaning rod continuously changes, the included angle in the middle of the movable cleaning rod continuously changes, the rotating cleaning rod is acted by the rotating centrifugal force of the movable cleaning rod, the rotating cleaning rod is enabled to turn outwards, the effect of carrying out spiral stirring on the material spraying nozzle is realized, the stirring degree is greatly improved, the stirring radius is improved by rotating the cleaning rod, and the problem of blockage of the material spraying nozzle is avoided.

2. According to the invention, through the rotation of the stirring fan blades, materials flow through the other end from one end of the material guide port, when the materials flow in from the large port of the direction limiting block, the materials flow into the small port along the large port of the direction limiting block and flow into the large port of the next direction limiting block to form a shaping cycle, when the materials flow in from the small port of the direction limiting block, the materials flow into the large port along the small port, and when the materials flow through the small port of the next direction limiting block, the pore diameters of the anti-blocking holes on the two outer sides are larger than those of the small port of the direction limiting block, so that the materials flow out of the anti-blocking holes, the effect of stirring the upper-layer materials and the lower-layer materials in the charging barrel is realized, and the temperature distribution in the charging barrel is more uniform.

3. According to the invention, the motor b drives the screw rod to rotate, the screw rod drives the extrusion cover to slide along the limiting groove, the vibration clamping block a and the vibration clamping block b are in contact extrusion, separation and extension, so that the pagoda spring a and the pagoda spring b vibrate the side wall of the charging barrel, materials adhered to the charging barrel wall and the nozzle wall fall off, and the problems of blockage and difficulty in cleaning are solved.

4. According to the invention, through the form change of the movable cleaning rod, the rotating range of the movable cleaning rod in the material spraying nozzle is matched with the shape of the inner cavity of the material spraying nozzle, so that the movable cleaning rod can fully stir materials at different positions in the material spraying nozzle, and the problem that a stirring shaft cannot extend into the material spraying nozzle to stir the materials in the material spraying nozzle due to the shape of the materials in the frustum-shaped material spraying nozzle of the traditional extruder is avoided, so that the materials are fully mixed, the uniformity of the materials is improved, and the problem that the quality of a film extruded by the extruder at the early stage is not up to the standard due to the imbalance of component proportion of the material in the material spraying nozzle due to the low uniformity of the materials in the material spraying nozzle is avoided.

Drawings

FIG. 1 is a schematic view of the overall structure of an extruder for producing a constant-volume extruded polylactic acid breathable film according to the present invention;

FIG. 2 is a schematic diagram of an external structure of a feeding mechanism of an extruder for producing a constant-extrusion polylactic acid breathable film according to the present invention;

FIG. 3 is a side sectional view of a feeding mechanism of an extruder for producing a constant-volume extruded polylactic acid breathable film according to the present invention;

FIG. 4 is a schematic view of the structure of an extrusion mechanism of an extruder for producing a constant-volume extruded polylactic acid breathable film according to the present invention;

FIG. 5 is an exploded view of a casting mechanism of an extruder for producing a constant-volume extruded polylactic acid breathable film according to the present invention;

FIG. 6 is a schematic structural diagram of a roll forming mechanism of an extruder for producing a constant-extrusion polylactic acid breathable film according to the present invention;

FIG. 7 is a schematic structural view of a winding mechanism of an extruder for producing a constant-extrusion polylactic acid breathable film according to the present invention;

FIG. 8 is a top sectional view of an extrusion mechanism of an extruder for producing a constant-volume extruded polylactic acid breathable film according to the present invention;

FIG. 9 is an enlarged view of a portion A of FIG. 8;

FIG. 10 is a schematic view of the internal structure of an extrusion mechanism of an extruder for producing a constant-volume extruded polylactic acid breathable film according to the present invention;

FIG. 11 is an explosion effect diagram of a part of the structure of an extrusion mechanism of an extruder for producing a polylactic acid breathable film extruded at a constant quantity according to the present invention;

FIG. 12 is a top sectional view of a stirring blade of an extruder for producing a constant-volume extruded polylactic acid breathable film according to the present invention.

In the figure:

1. a feeding mechanism; 11. a positioning frame; 12. a reaction tank; 13. a funnel; 14. a drying tower; 15. a heating rod; 16. a sliding door; 17. a fixed table; 18. a stirring assembly; 181. a motor a; 182. a transmission wheel a; 183. a transmission belt a; 184. conveying the material pipe; 185. a screw plunger; 186. a motor base a; 187. a discharge port;

2. an extrusion mechanism; 21. a motor b; 211. a motor base b; 22. a charging barrel; 221. a limiting groove; 222. vibrating the fixture block a; 223. a pagoda spring a; 23. a screw rod; 231. a stirring fan blade; 232. a material guide port; 233. a direction limiting block; 234. preventing the hole from being blocked; 24. extruding a cover; 241. a U-shaped limiting block; 242. vibrating the clamping block b; 243. a pagoda spring b; 25. a material spraying nozzle; 251. a reciprocating threaded rod; 252. a rotating ring; 253. a movable cleaning rod; 254. a connecting seat; 255. a connecting frame; 256. rotating the cleaning rod; 26. a support column a;

3. a tape casting mechanism; 31. a transmission wheel b; 32. a transmission belt b; 33. a motor c; 34. a support; 35. a strike-off assembly; 351. a doctor blade; 352. positioning a plate; 353. positioning a bolt; 36. a ventilation detection assembly; 361. a windmill; 362. an axial flow fan; 363. a windmill seat; 364. a support pillar b;

4. a roll forming mechanism; 41. a motor d; 42. a motor base c; 43. a rolling seat; 44. a compression roller; 45. a transmission gear; 46. a support pillar c;

5. a winding mechanism; 51. a motor e; 52. a motor base d; 53. a wind-up roll; 54. positioning the side plate; 55. a movable side plate; 56. a movable positioning handle; 561. a handle base; 562. sliding the inner column; 563. sliding the outer column; 57. a support plate; 58. a support pillar d;

6. a base plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to FIGS. 1-11: an extruder for producing a constant-extrusion polylactic acid breathable film comprises a feeding mechanism 1 and an extruding mechanism 2, wherein the feeding mechanism 1 comprises a positioning frame 11, the positioning frame 11 is fixedly connected with a winding mechanism 5, the top end of the positioning frame 11 is fixedly connected with a reaction tank 12, the bottom end of the reaction tank 12 is fixedly connected with a funnel 13, notches are formed in positions above and below the side surface of the reaction tank 12, sliding doors 16 are respectively and slidably connected to the positions, which are positioned on the two notches, of the side surface of the reaction tank 12, two heating rods 15 are fixedly connected between two inner side walls of the reaction tank 12, a fixed table 17 is fixedly connected to the inner side wall of the reaction tank 12, a drying tower 14 is fixedly connected to the top surface of the fixed table 17, a stirring assembly 18 is arranged at the bottom end of the funnel 13, the stirring assembly 18 comprises a motor base 186 a driving belt, which is fixedly connected with the positioning frame 11, a motor a181 is fixedly connected to the top surface of the motor base a186, a conveying pipe 184 is arranged above the motor a181, a spiral plunger 185 is rotatably connected to the inner side wall of the conveying pipe 184, a spiral plunger 185 is fixedly connected with a182, a driving wheel 183 a driving wheel is connected to the outer side wall of the driving wheel 184 a182, and a side wall of the driving wheel 183 a driving wheel is connected to the bottom end of the conveying pipe;

the extruding mechanism 2 comprises a motor b21 and a charging barrel 22, one end, far away from the motor b21, of the charging barrel 22 is fixedly connected with a material spraying nozzle 25, the motor b21 and the material spraying nozzle 25 are both of shell structures with one sides open, the output end of the motor b21 is fixedly connected with a screw rod 23, the outer side wall of the screw rod 23 is in threaded connection with an extruding cover 24, the side wall of the extruding cover 24 is fixedly connected with two U-shaped limiting blocks 241, the inner side wall of the charging barrel 22 is provided with two limiting grooves 221, the U-shaped limiting blocks 241 are in sliding connection with the limiting grooves 221, the outer part of each U-shaped limiting block 241 is in sliding connection with a vibrating fixture block b242, a pagoda spring b243 is fixedly connected between the vibrating fixture block b242 and the two side walls of each U-shaped limiting block 241, the limiting grooves 221 are internally and movably connected with a plurality of vibrating fixture blocks a222, and pagoda springs a223 are fixedly connected between the vibrating fixture blocks a222 and the two side walls of the limiting grooves 221;

the outer side wall of one end of the screw rod 23 adjacent to the charging barrel 22 is fixedly connected with two stirring fan blades 231, two sides of each stirring fan blade 231 are respectively provided with a material guide opening 232, the interior of each material guide opening 232 is fixedly connected with a plurality of direction limiting blocks 233, the inner wall of each material guide opening 232 is positioned between any two adjacent direction limiting blocks 233 and is respectively provided with an anti-blocking hole 234, the central position of the side wall of the material spraying nozzle 25 is fixedly connected with a connecting frame 255, a reciprocating threaded rod 251 is arranged between the connecting frame 255 and the screw rod 23, the reciprocating threaded rod 251 is rotatably connected with the screw rod 23, the reciprocating threaded rod 251 is fixedly connected with the connecting frame 255, the outer side wall of the reciprocating threaded rod 251 is provided with a rotating ring 252, the inner side wall of the rotating ring 252 is fixedly connected with a limiting slide block, and the rotating ring 252 is in threaded connection with the reciprocating threaded rod 251 through the limiting slide block, eight movable cleaning rods 253 are arranged between the outer side wall of the rotating ring 252 and the side wall of the screw rod 23, two ends of each movable cleaning rod 253 are rotatably connected with a connecting seat 254, the connecting seat 254 connected with one end of each movable cleaning rod 253 is fixedly connected with the side wall of the screw rod 23, the connecting seat 254 connected with the other end of each movable cleaning rod 253 is fixedly connected with the outer side wall of the rotating ring 252, the outer side wall of each movable cleaning rod 253 is rotatably connected with a rotating cleaning rod 256, the bottom end of the discharge port 187 is fixedly connected with the outer side wall of the charging barrel 22, the bottom end of the motor b21 is fixedly connected with a motor seat b211, two corner positions of the bottom end of the motor seat b211 and four corner positions of the bottom end of the charging barrel 22 are fixedly connected with supporting columns a26, and the outer side of one end of the extruding mechanism 2 adjacent to the material spraying nozzle 25 is sequentially provided with a casting and winding mechanism 3, a rolling forming mechanism 4 and a rolling mechanism 5;

placing a material in a reaction tank 12, forming a polylactic acid raw material after reaction, heating the polylactic acid raw material by a heating rod 15, opening a sliding door 16 at the bottom end, allowing the polylactic acid raw material to enter a hopper 13, and finally flowing the polylactic acid raw material into a material conveying pipe 184, starting a motor a181 to enable a screw plunger 185 to primarily stir the material, enabling the material to flow into a charging barrel 22 from a discharge port 187 by pushing the screw plunger 185, when the charging barrel 22 is fully stored with the material, starting a motor b21 to enable a screw rod 23 to rotate, enabling the screw rod 23 to drive an extrusion cover 24 in threaded connection with the screw rod 23 to move along the central axis thereof, and during the movement, enabling a vibration fixture block b242 to extrude the vibration fixture block a222 to enable a pagoda spring a223 connected with the vibration fixture block a222 to be bent to generate reset elastic force, so that when the vibration fixture a222 passes through a half of the cambered surface of the vibration fixture block b242, the vibration fixture a222 generates impact kinetic energy along the reset direction under the reset elastic force of the vibration fixture a223, thereby enabling the inner wall of the vibration fixture a222 to impact the inner wall of the charging barrel 22 to generate vibration, so as to enable the material to fall on the charging barrel 22;

the rotation of the screw rod 23 drives the stirring fan blades 231 at the bottom to rotate, so that the stirring fan blades 231 generate a circumferential stirring effect on the materials in the extrusion mechanism 2, part of the materials pass through the material guide port 232, the direction limiting block 233 in the material guide port 232 is of a splayed structure with a large port and a small port, when the materials enter from the small port of the direction limiting block 233, the materials can only overflow from the anti-blocking hole 234 due to the small through flow of the small port, the material flow direction is maintained, the materials can only enter from the large port, the materials at the position of the stirring fan blades 231 at one side enter the top end from the bottom end of the material guide port 232, the materials at the position of the stirring fan blades 231 at the other side enter the bottom end from the top end of the material guide port 232, and the up-down backflow with different directions at two sides is formed, so that the materials at the upper layer and the materials at the lower layer can also be stirred;

meanwhile, the side wall of the stirring fan blade 231 is provided with an anti-blocking hole 234;

the movable cleaning rod 253 comprises a first rod and a second rod which are connected in a hinged manner, and one ends of the first rod and the second rod, which are far away from the hinged position, are fixedly arranged on the rotating ring 252 and the spiral rod 23 respectively;

when the screw rod 23 rotates, the reciprocating screw rod 251 is rotationally connected with the screw rod 23, the reciprocating screw rod 251 is fixedly installed on the side wall of the material spraying nozzle 25 through the connecting frame 255, and the rotating ring 252 is in reciprocating threaded connection with the reciprocating screw rod 251 through the limiting slider, so that the rotation of the screw rod 23 can drive the rotating ring 252 to rotate through the connecting seat 254 and the movable cleaning rod 253, and because the rotating ring 252 is fixedly installed with the limiting slider, the rotating ring 252 can drive the limiting slider to rotate on the reciprocating screw rod 251, and simultaneously the rotating ring 252 rotates to translate on the reciprocating screw rod 251, and after the rotating ring 252 rotates and translates to one end of the reciprocating screw rod 251, the rotating ring 252 starts to rotate and reversely translates to reset due to the characteristics of the reciprocating screw rod 251, and rotates and translates again after the rotating ring is reset to the beginning, and the process is repeated;

when the rotating ring 252 rotates and translates, the ends of the first rod and the second rod in the movable cleaning rod 253, which are far away from the hinge, are continuously close to each other, so that the hinge of the first rod and the second rod is continuously far away from the central axis of the vertical reciprocating threaded rod 251, otherwise, when the ends of the first rod and the second rod, which are far away from the hinge, are continuously far away from each other, the hinge of the first rod and the second rod is continuously close to each other along the central axis of the vertical reciprocating threaded rod 251.

The shape of the movable cleaning rod 253 is changed by the reciprocating threaded rod 251 and the rotating ring 252 in the rotating process through the movable cleaning rod 253, so that the maximum radius in a motion track formed when the movable cleaning rod 253 rotates is changed in the rotating process, the movable cleaning rod 253 is enabled to stir materials in the material barrel 22 by the aid of the dynamically changed rotating radius of the movable cleaning rod 253, in the rotating process, when the movable cleaning rod 253 is used for changing the stirring radius, the shape of the movable cleaning rod 253 is changed in the rotating process, the movable cleaning rod 253 is enabled to extrude the materials while rotating and stirring, so that the materials are extruded by multi-directional extrusion force, the materials are extruded by force with non-unique direction in the material barrel, the phenomenon that the materials are locally accumulated in a specific stirring environment is avoided, and the stirring and mixing effects are improved.

Because the material spraying nozzle 25 is in a frustum shape, the shape change of the movable cleaning rod 253 ensures that the rotation range of the movable cleaning rod 253 in the material spraying nozzle 25 is matched with the shape of the inner cavity of the material spraying nozzle 25, the movable cleaning rod 253 can fully stir materials at different positions in the material spraying nozzle 25, and the problem that materials in the frustum-shaped material spraying nozzle 25 of the traditional extruder cannot be stirred by the stirring shaft in the material spraying nozzle 25 due to the shape of the materials is solved, so that the materials are fully mixed, the uniformity of the materials is improved, the problem that the uniformity of the materials in the material spraying nozzle is low, and the quality of a film extruded by the extruder at the early stage cannot reach the standard due to the imbalance of component proportions is solved.

In addition, as the stirring radius of the movable cleaning rod 253 is continuously changed, the material of the outer ring is stirred towards the outer ring through the movement of the movable cleaning rod 253, otherwise, the material of the inner ring is stirred towards the inner ring, so that the material of the inner ring and the material of the outer ring are continuously exchanged, and the effect of mixing and stirring is further improved; meanwhile, the movable cleaning rod 253 rotates to enable the rotating cleaning rod 256 rotatably connected with the outer side of the movable cleaning rod 253 to be acted by centrifugal force, one end of the rotating cleaning rod 256 expands outwards under the action of the centrifugal force, so that the total stirring effective volume of the movable cleaning rod 253 and the rotating cleaning rod 256 is increased, and materials can be fully stirred in the extrusion process;

after the material stirring is accomplished, material flows to the preliminary film forming of curtain coating forming mechanism 3, then through the roll-in shaping stamp of roll-in forming mechanism 4, store by the rolling of winding mechanism 5 rolling at last, the continuous rotation of rotating clearance pole 256 and activity clearance pole 253, make the inside raw materials of spouting material mouth 25 constantly stir, the stirring effect to the material in the complicated spouting material mouth 25 of small and shape has been realized, two stirring vane 231 stir the raw materials in the feed cylinder 22, the problem of blockking up has been avoided taking place to spout material mouth 25.

As shown in fig. 5, a casting mechanism 3 is disposed at one end of the extrusion mechanism 2 adjacent to the material nozzle 25, the casting mechanism 3 includes a motor c33 and two driving wheels b31, the side walls of the two driving wheels b31 are in transmission connection with a driving belt b32, the outer side walls of the two ends of the two driving wheels b31 are in rotation connection with a support 34, and the bottom end of the support 34 is fixedly connected with the bottom plate 6; when the material flows to the belt b32, the motor c33 is started to drive the belt b31 to rotate, and the belt b32 is driven by the rotation of the belt b31 to move horizontally, so that the material is transferred from the inlet end to the outlet end of the belt b 32.

As shown in fig. 5, an output end of the motor c33 is fixedly connected with a side wall of the driving wheel b31 of the adjacent extrusion mechanism 2, a bottom end of the motor c33 is fixedly connected with the support 34, a strickle assembly 35 is arranged above a top surface of the driving belt b32, the strickle assembly 35 comprises a positioning plate 352, two feet of the positioning plate 352 are fixedly connected with the bottom plate 6, a scraper blade 351 is slidably connected with a side surface of the positioning plate 352, a plurality of positioning holes are formed on the side wall of the positioning plate 352, positioning pins 353 are slidably connected on the side wall of the scraper blade 351 along a direction perpendicular to a moving direction of the scraper blade 351 and a direction perpendicular to the side surface of the positioning plate 352, and the positioning pins 353 are inserted into the positioning holes so as to fix the scraper blade 351 on the positioning plate 352;

wherein: one side of the positioning plate 352 is provided with a guide bar to move the doctor blade 351 in a direction perpendicular to the upper surface of the film.

When the film thickness is found to be not in accordance with the standard conditions, the positioning pins 353 are pulled out of the positioning holes to release the restriction of the doctor blade 351, then the doctor blade 351 is moved in the direction perpendicular to the upper surface of the film to adjust the position of the doctor blade 351 on the positioning plate 352, and after the doctor blade 351 is adjusted to a proper position, the positioning pins 353 are inserted into the positioning holes corresponding to the position, so that the film thickness after the doctor blade 351 is processed can meet the standard requirements.

As shown in fig. 5, an end of the transmission belt b32, which is far away from the extrusion mechanism 2, is provided with an air permeability detection assembly 36, the air permeability detection assembly 36 includes an axial flow fan 362, four corner positions at the bottom end of the axial flow fan 362 are fixedly connected with supporting columns b364, the supporting columns b364 are fixedly connected with the bottom plate 6, a windmill 361 is arranged above the axial flow fan 362, the top end of the windmill 361 is rotatably connected with a windmill seat 363, and a foundation of the windmill seat 363 is fixedly connected with the bottom plate 6;

when the axial flow fan 362 is started, the axial flow fan 362 generates upward airflow to the film, the windmill 361 above the film body capable of ventilating is rotated, at this time, the windmill 361 is observed manually, if the windmill 361 rotates, namely the formed film has air permeability, the scraper blade 351 does not need to be adjusted, and if the windmill 361 does not rotate, the scraper blade 351 needs to be adjusted to change the thickness of the film, so that the air permeability of the film is adjusted.

As shown in fig. 6, the roll-forming mechanism 4 includes a motor base c42 and a roll-forming base 43, two press rolls 44 are rotatably connected between two inner side walls of the roll-forming base 43, one end of the roll-forming base 43 is fixedly connected with the motor base c42, a side wall of the motor base c42 is fixedly connected with a motor d41, and an output end of the motor d41 penetrates through the motor base c42 and the roll-forming base 43 to be fixedly connected with one of the press rolls 44;

the film body on the casting mechanism 3 is placed between two press rollers 44, the motor d41 drives the lower press roller 44 to rotate, the lower press roller 44 is meshed with the upper press roller 44, so that the two press rollers 44 rotate together to extrude the film body into a fixed shape, and the press rollers 44 rotate to roll and shape the film.

As shown in fig. 6, one end of each of the two pressing rollers 44, which is far away from the motor d41, penetrates through a side wall of the pressing base 43 and is fixedly connected with a transmission gear 45, the two transmission gears 45 are meshed with each other, and supporting columns c46 are fixedly connected to four corner positions of the bottom surface of the pressing base 43;

the motor d41 is started to rotate the lower press roller 44, and the lower press roller 44 is connected through the two transmission gears 45 to roll and shape the film between the upper press roller 44 and the lower press roller 44, so that the effect of driving the two press rollers 44 to operate by the single motor is achieved.

As shown in fig. 7, the winding mechanism 5 includes a positioning side plate 54 and two movable side plates 55, a winding roller 53 is disposed between the positioning side plate 54 and the movable side plates 55, a movable positioning handle 56 is disposed between the two movable side plates 55, the movable positioning handle 56 includes two handle seats 561, the handle seats 561 are fixedly connected with the movable side plates 55, adjacent sides of the two handle seats 561 are fixedly connected with sliding outer columns 563, and sliding inner columns 562 are slidably connected inside the two sliding outer columns 563;

the film body on the casting forming mechanism 3 is placed between two compression rollers 44, the motor d41 drives the compression roller 44 below to rotate, the compression roller 44 below is meshed with the compression roller 44 above, the two compression rollers 44 rotate together and rotate in opposite directions, different printing patterns are arranged on the outer surface of the compression roller 44 according to different process requirements, and the film body is extruded into the film body meeting the production requirements.

As shown in fig. 7, one end of the wind-up roll 53 is rotatably connected with the positioning side plate 54, the other end of the wind-up roll 53 is rotatably clamped with the movable side plate 55, and one side of the positioning side plate 54, which is far away from the movable side plate 55, is fixedly connected with a motor base d52; the take-up roller 53 is rotated between the positioning side plate 54 and the movable side plate 55, and the motor e51 is started to rotate the take-up roller 53, so that the mold of the take-up roller 53 is taken up on the outer surface of the take-up roller 53.

As shown in fig. 7, a motor e51 is fixedly connected to a side wall of the motor base d52, an output end of the motor e51 penetrates through the side walls of the motor base d52 and the positioning side plate 54 and is fixedly connected to the winding roller 53, a support plate 57 is fixedly connected to a bottom end of the positioning side plate 54, the movable side plate 55 is slidably connected to the support plate 57, support pillars d58 are fixedly connected to four corner positions of the bottom surface of the movable side plate 55, and the movable side plate 55 slides on the support plate 57;

when the film of the winding roller 53 is fully wound, the movable side plates 55 on the two sides are slid, the winding roller 53 is taken out from one end of the movable side plate 55, a new winding roller 53 is placed, and the winding roller 53 can be positioned by closing the two movable side plates 55.

A use method of an extruder for producing a constant-amount extruded polylactic acid breathable film comprises the following steps:

step one, opening a sliding door 16 at the upper end, introducing materials into a reaction tank 12, closing the sliding door 16 to enable the materials to react, drying the interior of the reaction tank 12 by a drying tower 14, starting a heating rod 15 to heat the materials to melt the materials, opening the sliding door 16 at the lower end to enable the materials to flow into a material conveying pipe 184 through a funnel 13, starting a motor a181 to drive a spiral plunger 185 to rotate through transmission between a transmission wheel a182 and a transmission belt a183, and enabling the spiral plunger 185 to stir the materials in the material conveying pipe 184 and push the materials to a discharge port 187;

secondly, the material flows into the material barrel 22 from the discharge port 187, the motor b21 is started to drive the screw rod 23 to rotate, the screw rod 23 drives the extrusion cover 24 to slide along the limiting groove 221, the vibration fixture block a222 and the vibration fixture block b242 are in contact extrusion and separate extension, so that the pagoda spring a223 and the pagoda spring b243 vibrate the side wall of the material barrel 22, the two stirring blades 231 on the two sides of the port of the screw rod 23 rotate and stir, the screw rod 23 and the reciprocating threaded rod 251 rotate, the extrusion cover 24 slides to reduce the internal volume of the material barrel 22, and the material flows out from the material spraying nozzle 25;

step three, when the screw rod 23 rotates with the reciprocating threaded rod 251, the screw rod 23 drives the fixed movable cleaning rod 253 to rotate, the movable cleaning rod 253 drives the rotating ring 252 to rotate, the rotating ring 252 reciprocates outside the reciprocating threaded rod 251, the distance between two ends of the movable cleaning rod 253 is constantly changed, the included angle in the middle of the movable cleaning rod 253 is constantly changed, and the rotating cleaning rod 256 is acted by the rotating centrifugal force of the movable cleaning rod 253 to enable the rotating cleaning rod 256 to turn outwards;

step four, when the stirring fan blades 231 rotate, the material flows through the other end from one end of the material guide port 232, when the material flows in from the large opening of the direction limiting block 233, the material flows into the small opening along the large opening of the direction limiting block 233 and flows into the large opening of the next direction limiting block 233 to form a shaping cycle, when the material flows in from the small opening of the direction limiting block 233, the material flows into the large opening along the small opening, when the material flows through the small opening of the next direction limiting block 233, the aperture of the anti-blocking holes 234 on the two outer sides is larger than that of the small opening of the direction limiting block 233, so that the material flows out of the anti-blocking holes 234, and reverse circulation is avoided;

and step five, the material flows onto the transmission belt b32 from the material spraying nozzle 25, the film is scraped through the scraper blade 351, the windmill 361 starts the axial flow fan 362 above the film to rotate, the distance between the scraper blade 351 and the transmission belt b32 is adjusted through the rotation degree of the axial flow fan 362, the material is fixed in position through the positioning bolt 353, and the material is transported between the two compression rollers 44 through the transmission belt b32 and finally wound on the winding roller 53.

The use method and the working principle of the device are as follows: opening a sliding door 16 at the upper end, pouring materials into the reaction tank 12, closing the sliding door 16 to react the materials, drying the interior of the reaction tank 12 by a drying tower 14, starting a heating rod 15 to heat the interior materials to melt, opening the sliding door 16 at the lower end to enable the materials to flow into a material conveying pipe 184 through a funnel 13, starting a motor a181 to drive a screw plunger 185 to rotate through transmission between a transmission wheel a182 and a transmission belt a183, and stirring the materials in the material conveying pipe 184 by the screw plunger 185 and pushing the materials to a material outlet 187; the material flows into the material cylinder 22 from the discharge port 187, the screw rod 23 is driven to rotate by the starting motor b21, the screw rod 23 drives the extrusion cover 24 to slide along the limiting groove 221, the vibration fixture block a222 and the vibration fixture block b242 are in contact extrusion, separation and extension, so that the pagoda spring a223 and the pagoda spring b243 vibrate the side wall of the material cylinder 22, two stirring blades 231 on two sides of the port of the screw rod 23 are driven to rotate and stir, the material flows through the other end from one end of the material guide port 232, when the material flows in from the large opening of the limiting block 233, the material flows into the small opening along the large opening of the limiting block 233 and flows into the large opening of the next limiting block 233 to form a shaping cycle, when the material flows in from the small opening of the limiting block 233, the material flows into the large opening along the small opening, when the material flows through the small opening of the next limiting block 233, the aperture of the anti-blocking holes 234 on the two outer sides is larger than the limiting block 233, so that the material flows out from the small opening 234, and reverse flow is avoided; meanwhile, the screw rod 23 and the reciprocating threaded rod 251 are rotated, the screw rod 23 drives the fixed movable cleaning rod 253 to rotate, the movable cleaning rod 253 drives the rotating ring 252 to rotate, the rotating ring 252 reciprocates outside the reciprocating threaded rod 251, the distance between two ends of the movable cleaning rod 253 is constantly changed, the included angle in the middle of the movable cleaning rod 253 is constantly changed, the rotating cleaning rod 256 is acted by the rotating centrifugal force of the movable cleaning rod 253, the rotating cleaning rod 256 is enabled to turn outwards, the inner volume of the charging barrel 22 is reduced due to the sliding of the extrusion cover 24, materials flow onto the transmission belt b32 from the material spraying nozzle 25 and are scraped into a film through the scraper blade 351, the windmill 361 starts the axial flow fan 362 above the film to rotate, the distance between the scraper blade 351 and the transmission belt b32 is adjusted through the rotating degree of the axial flow fan 362, the materials are transported between the two compression rollers 44 through the positioning bolt 353, and finally wound on the winding roller 53.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a polylactic acid ventilated membrane production of constant extrusion is with extruder, includes extrusion mechanism (2), its characterized in that: the extruding mechanism (2) comprises a motor b (21) and a material barrel (22), one end, far away from the motor b (21), of the material barrel (22) is fixedly connected with a material spraying nozzle (25), the motor b (21) and the material spraying nozzle (25) are both of shell structures with openings on one sides, and an output end of the motor b (21) is fixedly connected with a screw rod (23);

the utility model discloses a spray nozzle, including feed cylinder (22), hob (23) and spray nozzle, outer wall fixedly connected with two stirring fan blade (231) that feed cylinder (22) one end is close to hob (23), material guide mouth (232) have been seted up between the both sides face of stirring fan blade (231), a plurality of limit piece (233) of inside fixedly connected with of material guide mouth (232), just limit piece (233) be the splayed structure that a port is big, a port is little, the lateral wall of material guide mouth (232) is located and has all seted up between two limit piece (233) and prevent stifled hole (234), the lateral wall central point department fixedly connected with link (255) of spouting material mouth (25), be provided with reciprocal threaded rod (251) between link (255) and hob (23), rotate between reciprocal threaded rod (251) and hob (23) and be connected in a rotating way, fixed connection between reciprocal threaded rod (251) and link (255), the lateral wall of reciprocal threaded rod (251) is provided with swivel ring (252), the inboard wall fixedly connected with limit slider of swivel ring (252), swivel ring (252) pass through between limit slider and the threaded rod (254) and clearance link between the swivel rod (253) of reciprocal threaded rod (253), the swivel ring (253) and swivel rod (253) that the clearance link is connected with two equal activity pole (253) of swivel rod (253), the two ends of swivel rod (253) are connected with the swivel rod (253) that the swivel rod (253) are connected with the swivel ring (253) that the swivel rod (253) is connected with the swivel rod (253) that the swivel rod (253) is connected with two swivel rod (253) that the swivel rod (253) is connected with the clearance link in the swivel rod (253) is all, the clearance link (253) of swivel rod (253), the lateral wall of swivel rod (253) of swivel ring (253), the swivel ring (253) that the swivel rod (253) is connected with two swivel rod (253) that the swivel rod (253) is connected with the lateral wall of swivel rod (253) that the swivel rod (253) is connected with the clearance connection seat (23) The side walls are fixedly connected, a connecting seat (254) connected with the other end of the movable cleaning rod (253) is fixedly connected with the outer side wall of the rotating ring (252), and the outer side walls of the movable cleaning rod (253) are rotatably connected with rotating cleaning rods (256);

the lateral wall threaded connection of hob (23) has extrusion lid (24), two U-shaped stopper (241) of the lateral wall fixedly connected with of extrusion lid (24), two spacing grooves (221) have been seted up to the inside wall of feed cylinder (22), sliding connection between U-shaped stopper (241) and spacing groove (221), the outside sliding connection of U-shaped stopper (241) has vibrations fixture block b (242), fixedly connected with pagoda spring b (243) between the both sides wall of vibrations fixture block b (242) and U-shaped stopper (241), spacing groove (221) inside swing joint has a plurality of vibrations fixture block a (222), fixedly connected with pagoda spring a (223) between the both sides wall of vibrations fixture block a (222) and spacing groove (221).

2. The extruder according to claim 1, wherein the extruder is characterized in that: still include pan feeding mechanism (1), pan feeding mechanism (1) includes locating rack (11), locating rack (11) fixedly connected with winding mechanism (5), the top fixed connection reaction tank (12) of locating rack (11), the bottom fixedly connected with funnel (13) of reaction tank (12), the top and the below position department of reaction tank (12) side have all seted up the fluting, reaction tank (12) side just is located two equal sliding connection in position department of fluting has sliding door (16), two heating rod (15) of fixedly connected with between two inside walls of reaction tank (12), the inside wall fixedly connected with fixed station (17) of reaction tank (12), the top surface fixedly connected with drying tower (14) of fixed station (17), the bottom of funnel (13) is provided with stirring subassembly (18), stirring subassembly (18) includes motor cabinet a (186), fixedly connected with between motor cabinet a (186) and locating rack (11), the top surface fixedly connected with motor a (181) of motor cabinet a (182), the top of motor cabinet a (184) is provided with the transport pipe (184), the transport pipe (185) is connected with the output end of spiral material pipe (185 a) and plunger (185) and the equal rotation of plunger (181 a), the outer sides of the two driving wheels a (182) are in transmission connection with a driving belt a (183), and the bottom end of the side wall of the material conveying pipe (184) far away from one end of the driving wheels a (182) is fixedly connected with a material outlet (187);

the bottom end of the discharge port (187) is fixedly connected with the outer side wall of the charging barrel (22), the bottom end of the motor b (21) is fixedly connected with a motor base b (211), two corner positions of the bottom end of the motor base b (211) and four corner positions of the bottom end of the charging barrel (22) are fixedly connected with supporting columns a (26), and the outer side of one end of the adjacent material spraying nozzle (25) of the extruding mechanism (2) is sequentially provided with a tape casting mechanism (3), a roll forming mechanism (4) and a winding mechanism (5).

3. The extruder of claim 2 for producing a constant extruded polylactic acid breathable film, wherein: the casting forming mechanism (3) comprises a motor c (33) and two driving wheels b (31), the side walls of the two driving wheels b (31) are in transmission connection with a driving belt b (32), the outer side walls of the two ends of the two driving wheels b (31) are in rotation connection with a support (34), and the bottom end of the support (34) is fixedly connected with the bottom plate (6).

4. The extruder according to claim 3, wherein the extruder is characterized in that: the extruding mechanism is characterized in that the output end of the motor c (33) is fixedly connected with the side wall of the transmission wheel b (31) of the adjacent extruding mechanism (2), the bottom end of the motor c (33) is fixedly connected with the support (34), a scraping component (35) is arranged above the top surface of the transmission belt b (32), the scraping component (35) comprises a positioning plate (352), two ground feet of the positioning plate (352) are fixedly connected with the bottom plate (6), a scraper blade (351) is connected to the side face of the positioning plate (352) in a sliding mode, a plurality of positioning holes are formed in the side wall of the positioning plate (352), a positioning bolt (353) is connected to the side wall of the scraper blade (351) in a sliding mode, and the positioning bolt (353) is connected with the positioning holes in an inserting mode and used for fixedly mounting the scraper blade (351) on the positioning plate (352).

5. The extruder of claim 3 for producing a constant extruded polylactic acid breathable film, wherein: one end, far away from the extrusion mechanism (2), of the transmission belt b (32) is provided with a ventilation detection assembly (36), the ventilation detection assembly (36) comprises an axial flow fan (362), four corner positions at the bottom end of the axial flow fan (362) are fixedly connected with supporting columns b (364), the supporting columns b (364) are fixedly connected with the bottom plate (6), a windmill (361) is arranged above the axial flow fan (362), the top end of the windmill (361) is rotatably connected with a windmill seat (363), and the ground feet of the windmill seat (363) are fixedly connected with the bottom plate (6).

6. The extruder according to claim 2, wherein the extruder is characterized in that: the rolling forming mechanism (4) comprises a motor base c (42) and a rolling base (43), two pressing rollers (44) are rotatably connected between two inner side walls of the rolling base (43), one end of the rolling base (43) is fixedly connected with the motor base c (42), the side wall of the motor base c (42) is fixedly connected with a motor d (41), and the output end of the motor d (41) penetrates through the motor base c (42) and the rolling base (43) to be fixedly connected with one pressing roller (44);

two press roll (44) are kept away from motor d (41) one end and are all run through the lateral wall and the fixedly connected with drive gear (45) of roll seat (43), two intermeshing between drive gear (45), four corner position departments of roll seat (43) bottom surface are equal fixedly connected with support column c (46).

7. The extruder according to claim 2, wherein the extruder is characterized in that: winding mechanism (5) are including location curb plate (54) and two activity curb plate (55), be provided with wind-up roll (53) between location curb plate (54) and the activity curb plate (55), two activity curb plate (55) lateral wall is provided with activity location handle (56), activity location handle (56) include two handle seats (561), fixed connection between handle seat (561) and activity curb plate (55), two equal fixedly connected with in the adjacent one side of handle seat (561) slide outer column (563), two slide outer column (563) internal sliding connection has slip inner column (562).

8. The extruder according to claim 7, wherein the extruder is characterized in that: one end of the winding roller (53) is rotatably connected with the positioning side plate (54), the other end of the winding roller (53) is rotatably clamped with the movable side plate (55), and one side, far away from the movable side plate (55), of the positioning side plate (54) is fixedly connected with a motor base d (52);

the utility model discloses a winding roller, including motor cabinet d (52), the lateral wall fixedly connected with motor e (51) of motor cabinet d (52), the output of motor e (51) runs through the lateral wall of motor cabinet d (52) and location curb plate (54), and with fixed connection between wind-up roll (53), the bottom fixedly connected with backup pad (57) of location curb plate (54), sliding connection between activity curb plate (55) and backup pad (57), equal fixedly connected with support column d (58) in four corner positions departments in the bottom surface of activity curb plate (55).

9. A method for using an extruder for producing a constant-extruded polylactic acid breathable film, which comprises the steps of:

step one, opening a sliding door (16) at the upper end, introducing materials into a reaction tank (12), closing the sliding door (16) to enable the materials to react, drying the interior of the reaction tank (12) by a drying tower (14), starting a heating rod (15) to heat the interior of the reaction tank to enable the interior materials to be molten, opening a sliding door (16) at the lower end to enable the materials to flow into a material conveying pipe (184) through a funnel (13), starting a motor a (181) to drive a spiral plunger (185) to rotate through transmission between a transmission wheel a (182) and a transmission belt a (183), and stirring the materials in the material conveying pipe (184) by the spiral plunger (185) and pushing the materials to a discharge port (187);

secondly, the material flows into the charging barrel (22) from the discharge hole (187), the motor b (21) is started to drive the screw rod (23) to rotate, the screw rod (23) drives the extrusion cover (24) to slide along the limiting groove (221), the vibration clamping block a (222) and the vibration clamping block b (242) are in contact extrusion, separated and extended, the pagoda spring a (223) and the pagoda spring b (243) vibrate the side wall of the charging barrel (22), two stirring blades (231) on two sides of the port of the screw rod (23) are rotated and stirred, the screw rod (23) and the reciprocating threaded rod (251) are rotated, the extrusion cover (24) slides to reduce the internal volume of the charging barrel (22), and the material flows out from the material spraying nozzle (25);

step three, when the screw rod (23) and the reciprocating threaded rod (251) rotate, the screw rod (23) drives the fixed movable cleaning rod (253) to rotate, the movable cleaning rod (253) drives the rotating ring (252) to rotate, the rotating ring (252) reciprocates outside the reciprocating threaded rod (251), the distance between two ends of the movable cleaning rod (253) is constantly changed, the included angle between the middle parts of the movable cleaning rod (253) is constantly changed, and the rotating cleaning rod (256) is acted by the rotating centrifugal force of the movable cleaning rod (253) to enable the rotating cleaning rod (256) to turn outwards;

when the stirring fan blades (231) rotate, materials flow through the other end from one end of the material guide port (232), when the materials flow in from the large opening of the direction limiting block (233), the materials flow into the small opening along the large opening of the direction limiting block (233) and flow into the large opening of the next direction limiting block (233) to form a shaping cycle, when the materials flow in from the small opening of the direction limiting block (233), the materials flow into the large opening along the small opening, when the materials flow through the small opening of the next direction limiting block (233), the aperture of the anti-blocking holes (234) on the two outer sides is larger than that of the small opening of the direction limiting block (233), so that the materials flow out from the anti-blocking holes (234);

fifthly, the material flows onto a transmission belt b (32) from a material spraying nozzle (25), a film is scraped through a scraper blade (351), a windmill (361) is started to rotate an axial flow fan (362) above the film, the distance between the scraper blade (351) and the transmission belt b (32) is adjusted according to the rotation degree of the axial flow fan (362), the material is fixed in position through a positioning bolt (353), is transported between two compression rollers (44) through the transmission belt b (32), and is finally wound on a winding roller (53).