Processing equipment and process of medical isolation high-air-permeability water-impermeable microporous film

Abstract

The present application relates to the technical field of film processing, and particularly relates to a processing equipment and process of a medical isolation high-air-permeability water-impermeable microporous film, raw materials are sequentially processed through a dryer, a screw extruder, a quick-change filter, a metering pump, an extrusion die head, a casting roller, a thickness gauge and a winding machine, the screw extruder comprises a hopper, a rotating body with a dynamic bridge prevention function is installed in the hopper, and the rotating body is composed of an upper premixing structure, a middle mixing structure and a lower extrusion structure. In the present application, the upper premixing structure of the rotating body disintegrates the initial bridge layer through conical spiral blades and stirring bars, the middle mixing structure destroys the particle agglomeration through the shear force generated by the reverse rotation of the inner and outer tooth rings, after the bridge phenomenon occurs, the change of the torque force is detected, the hydraulic rod is self-started to drive the upper premixing structure and the middle mixing structure to move downward at the same time to form mechanical intervention, and the real-time prevention and breaking of the bridge phenomenon are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film processing, in particular to a processing equipment and process of medical isolation high-breathability water-impermeable microporous film. BACKGROUND

[0002] In the film processing, a variety of equipment is needed, which generally needs to be premixed and uniformly mixed, dried, and then added to the hopper. The raw materials in the hopper move downward into the feeding port of the extruder during the extruder processing by relying on their own gravity. The raw materials in the hopper may have problems such as clogging, moisture absorption, and uneven mixing.

[0003] For example, Chinese patent CN2024204857963 discloses an extruder with an anti-clogging hopper, which includes a hopper, a rotating block rotating in the hopper, a gear driving the rotating block to rotate, a driving device driving the gear to rotate, and an extrusion plate for quickly extruding the material. A first sliding groove is formed on the hopper, and the rotating block is rotatably connected in the first sliding groove. The rotating block is provided with a rack, and the rack is engaged with the gear. It solves the problem that the feeding funnel of the extruder lacks a simple and efficient anti-clogging mechanism, and the plastic particle raw materials are prone to clogging and bridging at the neck of the feeding funnel, which is not conducive to the normal and stable operation of the extruder.

[0004] However, the technical solution of the above-mentioned patent only prevents the bridging phenomenon by the rotating anti-clogging mechanism, and prevention can only reduce the probability of occurrence, but cannot completely avoid the formation of the bridging phenomenon. Once the arch structure is formed, it cannot be destroyed, and manual operation is needed to destroy it, which is not convenient and efficient. In addition, the long-term placement of the raw materials may cause moisture absorption, which may increase the probability of the bridging phenomenon. Therefore, the present application provides a processing equipment and process of medical isolation high-breathability water-impermeable microporous film to solve the above-mentioned problems. SUMMARY

[0005] To solve the above technical problems, the present application provides a processing equipment of medical isolation high-breathability water-impermeable microporous film, which includes a dryer, a screw extruder, a quick-change filter, a metering pump, an extrusion die, a casting roller, a thickness gauge, and a winding machine. The raw materials pass through the dryer, the screw extruder, the quick-change filter, the metering pump, the extrusion die, the casting roller, the thickness gauge, and the winding machine in sequence to complete the processing.

[0006] The screw extruder includes a hopper, and a rotating body with a dynamic anti-bridging function is installed in the hopper. The rotating body is composed of an upper segment premixing structure, a middle segment mixing structure, and a lower segment extrusion structure.

[0007] The upper segment premixing structure and the middle segment mixing structure cooperate to mix the raw materials and prevent bridging phenomenon and break the bridging phenomenon;

[0008] The lower segment extrusion structure is used to compact and uniformly feed the materials, and connect the external hot gas flow to realize the dust removal and preheating of the raw materials in cooperation with the middle segment mixing structure.

[0009] Preferably, the screw extruder further comprises a distribution box, the bottom of the distribution box is provided with a base, the upper end of the distribution box is provided with an extrusion cylinder, the inlet of the extrusion cylinder is provided with a driving structure, the outlet of the extrusion cylinder is connected with a quick-change filter, the upper end of the driving structure is provided with a feeder, and the top of the feeder is mounted with a hopper.

[0010] The hopper comprises a hopper box, the rear side of the hopper box is provided with a fixed plate, the bottom of the fixed plate is fixed on the top of the distribution box, the upper end of the hopper box is provided with a feeding pipe on the left side, and the upper end of the hopper box is provided with a dust removal pipe on the right side.

[0011] Preferably, the structure of the upper segment premixing structure comprises an upper shaft, the top of the upper shaft is rotatably connected with a hydraulic rod through a bearing seat, the hydraulic rod is fixedly installed on the top of the hopper box, a spiral blade is installed on the outer side of the upper shaft, the spiral blade is in a whole conical structure, the outer diameter of the spiral blade gradually decreases from top to bottom, a plurality of through holes are formed in the spiral blade, and a plurality of stirring rods are further arranged on the bottom of the spiral blade.

[0012] Preferably, the bottom of the upper shaft is fixedly connected with a middle segment mixing structure, the middle segment mixing structure comprises a middle shaft, an inner gear ring is sleeved on the middle shaft, an outer gear ring is arranged on the outer side of the inner gear ring, teeth are arranged on the outer side of the inner gear ring, teeth are arranged in the inner part of the outer gear ring, a sliding ring is arranged on the outer side of the outer gear ring, the sliding ring is embedded in the inner wall of the hopper box, a plurality of intermediate gears are arranged between the outer gear ring and the inner gear ring, and the intermediate gears are installed on the inner wall of the hopper box through fixed rods.

[0013] Preferably, the middle shaft is internally provided with a cavity, a spray hole is arranged on the side wall of the cavity, an inner groove is formed in the inner part of the inner gear ring, the inner groove is communicated with the spray hole, a plurality of gas outlets are formed in the top of the inner groove, and the upper surfaces of the plurality of gas outlets are covered with a mesh cover.

[0014] Preferably, the bottom of the middle shaft is provided with a sliding block on each of the left and right sides, the middle shaft is connected with the lower segment extrusion structure and can move up and down in the lower segment extrusion structure and rotate with the rotation of the lower segment extrusion structure.

[0015] Preferably, the lower segment extrusion structure comprises a mounting frame, both ends of the mounting frame are fixed on the inner wall of the hopper box, a lower shaft is mounted on the center of the mounting frame through a rotating seat, a torque sensor is arranged on the top of the lower shaft, the torque sensor is fixed on the mounting frame through a side rod, a connector is arranged on the top of the torque sensor, the connector is sleeved with the middle shaft, the inner cavity of the connector is matched with the outer diameter of the middle shaft, sliding grooves are arranged on the left and right sides of the inner cavity, and the sliding blocks on the bottom of the middle shaft are located in the sliding grooves.

[0016] Preferably, a bevel gear is arranged on the lower side of the mounting frame on the lower shaft, the bevel gear engages a transmission rod, the transmission rod extends through the side wall of the material box to the outside, the transmission rod is rotationally connected with the side wall of the material box, and a driving motor is arranged at the end of the transmission rod.

[0017] An air inlet cavity is arranged in the lower shaft, the bottom of the air inlet cavity is connected with an air inlet pipe through a rotary sealing joint, the upper end of the air inlet cavity extends to the inside of the torque sensor, and the air inlet cavity is communicated with the cavity through a connecting pipe.

[0018] Preferably, the lower part of the lower shaft is provided with two spiral feeders arranged in an up-down direction, two left-right symmetrical squeezers are arranged between the two spiral feeders, the squeezer comprises an arc-shaped plate, the bottom of the arc-shaped plate is rotationally connected with a connecting seat, the connecting seat is fixed on the lower shaft, a spring is arranged on the top of the arc-shaped plate and close to one side of the lower shaft, and one end of the spring is fixed on the outer side wall of the lower shaft.

[0019] In addition, the application further discloses a processing technology of the medical isolation high-air-permeability water-impermeable microporous film, and the specific steps are as follows:

[0020] First, the raw materials are pretreated and uniformly mixed, and then the uniformly mixed raw materials are sent into a dryer for drying and dehumidification;

[0021] Then, the dried and uniformly mixed materials are conveyed into a screw extruder, the screw extruder is used for converting the solid plastic particles into molten polymers through shearing and heating, and the subsequent molten materials are filtered through a quick-change filter and then conveyed into a metering pump connected with the quick-change filter;

[0022] The metering pump can extremely accurately control the volume of the molten materials conveyed per unit time and convey the molten materials into an extrusion die head;

[0023] The molten materials in the extrusion die head are extruded through a die lip to form a molten film with a required width and initial thickness, the high-temperature molten curtain extruded from the extrusion die head is attached to the surface of a casting roller rotating at a high speed and internally provided with a cooling medium, the molten materials are shaped into a solid film, and the film after cooling and shaping can be processed to have micron-level apertures through a laser processing device integrated on one side of the discharge end of the casting roller;

[0024] The processed film is wound into a mother roll by a thickness detector after being detected to be qualified, and the film is convenient for subsequent reprocessing.

[0025] The technical effects and advantages of the application are as follows:

[0026] 1. The upper section premixing structure of the rotating body in the application breaks the initial bridging layer through the conical helical blade and the stirring rod, the middle section mixing structure breaks the particle agglomeration through the shear force generated by the reverse rotation of the inner / outer tooth ring, after the bridging phenomenon occurs, the hydraulic rod is self-started to drive the upper section premixing structure and the middle section mixing structure to move downward at the same time to form mechanical intervention, realizing the real-time prevention and breaking of the bridging phenomenon.

[0027] 2. The shaft cavity in the application is connected to the hot gas flow, which is sprayed out through the air outlet hole of the inner tooth ring, so that the raw materials are rolled and intensively mixed in the gear meshing area to prevent the bridging phenomenon and preheat the raw materials to prevent the raw materials from being damp, and the rising hot gas flow can also carry dust out through the dust exhaust pipe to improve the processing quality of the film. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the flow block of the application;

[0029] Figure 2 is the perspective view of the screw extruder in the application;

[0030] Figure 3 is the front view of the screw extruder in the application;

[0031] Figure 4 is the structural schematic view of the hopper in the application;

[0032] Figure 5 is the structural schematic view of the inside of the hopper in the application;

[0033] Figure 6 is the structural schematic view of the rotating body in the application;

[0034] Figure 7 is the structural schematic view of the upper section premixing structure in the application;

[0035] Figure 8 is the partial exploded view of the middle section mixing structure in the application;

[0036] Figure 9 is the partial sectional view of the middle section mixing structure in the application;

[0037] Figure 10 is the structural schematic view of the lower section extrusion structure in the application;

[0038] Figure 11 is the partial sectional view of the upper shaft, the middle shaft and the lower shaft in the connected state in the application;

[0039] Figure 12 is the structural schematic view of the rotating body in the application Figure 11 is the structural schematic view of A in the application;

[0040] Figure 13Fig. 1 is a schematic diagram of the structure of a casting roller in the present application.

[0041] Fig. 1 is a schematic diagram of the structure of a casting roller in the present application.

[0042] 1, dryer; 2, screw extruder; 3, quick-change filter; 4, metering pump; 5, extrusion die; 6, casting roller; 7, thickness gauge; 8, winding machine; 9, rotating body; 10, connecting pipe;

[0043] 21, distribution box; 22, base; 23, extrusion cylinder; 24, driving structure; 25, feeder; 26, hopper; 261, tank; 262, fixed plate; 263, feeding pipe; 264, dust removal pipe;

[0044] 91, upper premixing structure; 92, middle mixing structure; 93, lower extruding structure;

[0045] 911, upper shaft; 912, hydraulic rod; 913, helical blade; 914, via hole; 915, stirring rod;

[0046] 921, middle shaft; 922, inner tooth ring; 923, outer tooth ring; 924, intermediate gear; 925, fixed rod; 926, mesh cover; 9211, cavity; 9212, injection hole; 9213, sliding block; 9221, inner groove; 9222, air outlet hole;

[0047] 931, lower shaft; 932, screw feeder; 933, extruder; 9331, pressing plate; 9332, connecting seat; 9333, spring; 934, mounting bracket; 935, bevel gear; 936, transmission rod; 937, driving motor; 938, torque sensor; 939, connector; 9311, air inlet cavity; 9312, air inlet pipe; 9391, chute. DETAILED DESCRIPTION

[0048] The present application will be further described with reference to the drawings and specific embodiments. The embodiments of the present application are given by way of example and illustration only, and are not to be construed as exhaustive or limiting of the present application. Many modifications and variations of the present application will be apparent to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the present application and its practical application, and to thereby enable others skilled in the art to best utilize the present application, with various modifications as are suited to the particular use contemplated. Example 1

[0049] Please refer to Figure 1 and Figure 13As shown, in the present embodiment, a processing equipment for medical isolation high-air-permeable water-impermeable microporous film is provided, which comprises the following equipment: a dryer 1, a screw extruder 2, a quick-change filter 3, a metering pump 4, an extrusion die 5, a casting roller 6, a thickness gauge 7 and a winding machine 8, which realize the process from raw materials to winding after processing in the film processing;

[0050] Specifically, the raw materials are first pretreated, i.e. mixed to ensure uniform dispersion of components, and then sent into the dryer 1 for drying and dehumidification to evaporate and remove the water absorbed or adsorbed by the raw material particles, so as to ensure that the water content of the raw material entering the screw extruder 2 meets the processing requirements. Alternatively, the materials requiring dehumidification can be independently dried first, and then mixed after drying. The selection can be made according to the actual production needs.

[0051] The dried and mixed materials are then sent to the screw extruder 2, which converts the solid plastic particles into molten polymer with uniform temperature, pressure and components through shearing and heating. The subsequent molten material is discharged and filtered through the quick-change filter 3. The filter screen inside the quick-change filter 3 intercepts impurities (such as unmelted particles, carbides, gels, metal shavings and environmental pollutants) in the melt. When the filter screen is blocked and the melt pressure rises to the set upper limit, the quick-change mechanism is activated, the dirty filter screen assembly is removed, and the filter screen is cleaned or replaced. The quick-change filter 3 protects the downstream equipment from being clogged or scratched by impurities, improves the purity of the melt, eliminates "crystal points" or "fish eyes" on the surface of the film, and ensures the appearance quality and physical properties of the film.

[0052] The outlet of the quick-change filter 3 is connected to the inlet of the metering pump 4. The filtered melt enters the inlet of the metering pump 4. By accurately controlling the gear speed in the metering pump 4, the volume of the melt delivered to the extrusion die 5 per unit time can be extremely accurately controlled, and the output fluctuation of the screw extruder 2 can be eliminated.

[0053] The stable melt flow from the metering pump 4 enters the shunt cavity of the extrusion die 5. The melt is extruded through the die lip to form a melt film with the required width and initial thickness. The high-temperature melt curtain extruded from the extrusion die 5 is accurately attached to the surface of the large-diameter casting roller 6 rotating at high speed and having a cooling medium inside. The melt is shaped into a solid film through rapid, uniform and controllable cooling. It should be noted that since it is a microporous air-permeable film, the film after cooling and shaping can be processed to have micrometer-sized pores through the laser processing equipment integrated on one side of the outlet end of the casting roller 6.

[0054] The processed material passes through the thickness gauge 7, which can detect the thickness of the film on line, in real time and non-destructively, so as to understand the production state in real time and determine whether the product meets the thickness specification. Finally, the continuously produced film is wound into a mother roll by the winding machine 8 in a flat, compact and neat manner. The film product after winding can be further processed, such as slitting, bag making, printing, compounding, etc. Example 2

[0055] Please refer to Figures 2-12 In this embodiment, the screw extruder 2 in the processing equipment of the medical isolation high-air-permeability water-impermeable microporous film in Example 1 is further improved.

[0056] As shown in Figure 2 and Figure 3 , the screw extruder 2 includes a distribution box 21, the bottom of the distribution box 21 is provided with a base 22, and the upper end of the distribution box 21 is provided with an extrusion cylinder 23. The inlet of the extrusion cylinder 23 is provided with a driving structure 24, the outlet of the extrusion cylinder 23 is connected with the quick-change filter 3, and the top of the driving structure 24 is provided with a feeder 25. The top of the feeder 25 is installed with a hopper 26, the hopper 26 is connected with an external material conveying device, the external material enters the hopper 26, and then enters the extrusion cylinder 23 through the feeder 25. The driving structure 24 is started to make the extrusion cylinder 23 work, melt the raw material, and complete extrusion. The outlet of the extrusion cylinder 23 is connected with the quick-change filter 3 to complete the conveying of the material.

[0057] The specific structure of the hopper 26 is shown in Figure 4 , which includes a hopper box 261. The rear side of the hopper box 261 is provided with a fixed plate 262, and the bottom of the fixed plate 262 is fixed to the top of the distribution box 21 to assist in supporting the hopper box 261 and keeping it stable.

[0058] The left side of the upper end of the hopper box 261 is provided with a feeding pipe 263, and the feeding pipe 263 is connected with an external material conveying device. The external material enters the hopper box 261 through the feeding pipe 263 for subsequent processing. Meanwhile, the right side of the upper end of the hopper box 261 is installed with a dust removal pipe 264, which can remove the dust in the hopper box 261 to the outside, thereby improving the quality of the extruded film.

[0059] After the raw material enters the hopper box 261, as shown in Figure 5 , the rotating body 9 installed inside the hopper box 261 realizes secondary mixing. Meanwhile, the rotating body 9 can also prevent the arching phenomenon of the raw material in the hopper 26, and can automatically trigger the destruction function to automatically break the arching phenomenon after it occurs. Furthermore, the rotating body 9 can also realize the functions of dust removal and preheating of the raw material in the hopper box 261, so as to avoid the raw material from being damp after being placed for a long time. The preheating can help the raw material to melt faster after entering the extrusion cylinder 23.

[0060] The specific structure of the rotating body 9 is shown in Figure 5 and Figure 6 The specific structure of the rotating body 9 is shown in

[0061] The specific structure of the rotating body 9 is shown in Figure 7 The specific structure of the rotating body 9 is shown in

[0062] The specific structure of the rotating body 9 is shown in

[0063] The specific structure of the rotating body 9 is shown in Figure 7 、 Figure 8 and Figure 9As shown, the bottom of the upper shaft 911 is fixedly connected to the middle mixing structure 92, which includes a middle shaft 921. A ring with internal teeth 922 is sleeved on the middle shaft 921. An outer ring with teeth 923 is arranged on the outer side of the ring with internal teeth 922. Teeth are arranged on the outer side of the ring with internal teeth 922. Teeth are arranged on the inner side of the outer ring with teeth 923. At the same time, a sliding ring is arranged on the outer side of the outer ring with teeth 923. The sliding ring is embedded in the inner wall of the material box 261. The outer ring with teeth 923 can rotate in the inner wall of the material box 261. Moreover, a plurality of intermediate gears 924 are arranged between the outer ring with teeth 923 and the ring with internal teeth 922. The intermediate gears 924 are installed on the inner wall of the material box 261 through fixed rods 925. Moreover, the intermediate gears 924 are rotationally connected with the fixed rods 925. When the middle shaft 921 rotates, it can drive the ring with internal teeth 922 to rotate. The rotation of the ring with internal teeth 922 will drive the intermediate gears 924 to rotate. Thus, the intermediate gears 924 can rotate the outer ring with teeth 923. The rotation direction of the intermediate gears 924 is opposite to that of the ring with internal teeth 922.

[0064] The outer ring with teeth 923 and the ring with internal teeth 922 have a discharging gap therebetween, which can make the material fall. Moreover, the two opposite rotating forces can make the materials rub and roll against each other, further mixing the materials and making the materials slide against each other. The opposite forces can break the agglomerated particles through twisting, preventing the formation of arches.

[0065] The ring with internal teeth 922 also has the functions of dust removal and moisture removal, such as Figure 9 As shown, the middle shaft 921 has a cavity 9211 inside. The side wall of the cavity 9211 is provided with a spray hole 9212. Hot air flows into the cavity 9211 first, and then is delivered to the inside of the ring with internal teeth 922 through the spray hole 9212. An inner groove 9221 is formed in the inside of the ring with internal teeth 922. The inner groove 9221 is in communication with the spray hole 9212. A plurality of air outlets 9222 are formed in the top of the inner groove 9221. The upper surfaces of the air outlets 9222 are covered with a mesh cover 926. The airflow sprayed out of the spray hole 9212 enters the inner groove 9221. The airflow in the inner groove 9221 is discharged through the air outlets 9222 and the mesh cover 926. The upward airflow achieves the effect of dust removal on the raw materials. The sprayed airflow is hot air. The hot air flows in the raw materials, preliminarily heats the raw materials, and prevents moisture at the same time. At the same time, the upward blowing effect can suppress the dust remaining in the raw materials from falling into the extruder body along with the materials. The dust can be discharged through the dust discharge pipe 264, improving the extrusion quality of the materials. When the airflow blows, it also accelerates the effect of mutual rolling of the raw materials to some extent, promoting the prevention of arching and further mixing of the raw materials, and improving the prevention effect of arching.

[0066] The bottom of the middle shaft 921 is provided with a sliding block 9213 on both sides, and the middle shaft 921 is connected with the lower extrusion structure 93, which can move up and down in the lower extrusion structure 93 and rotate with the rotation of the lower extrusion structure 93. The lower extrusion structure 93 is an output structure of the driving force, and the rotation drives the upper premixing structure 91 and the middle mixing structure 92 to rotate, realizing the functions of mixing and preventing the bridge phenomenon, etc. When the bridge phenomenon occurs, the upper premixing structure 91 will sense the change of the resistance of the raw materials in the material box 261 (the structure for detecting the change of the resistance will be described below), and while the upper premixing structure 91, the middle mixing structure 92 and the lower extrusion structure 93 continue to rotate, the hydraulic rod 912 at the top will drive the upper premixing structure 91 to move downward, and the middle shaft 921 will move downward and drive the inner gear ring 922 to move downward. When the above structure moves downward, the formed bridge structure is broken, achieving the purpose of breaking. In this process, in addition to the vertical movement of the spiral blade 913 and the inner gear ring 922, the height difference between the inner gear ring 922 and the outer gear ring 923 changes after the inner gear ring 922 moves downward, so that the rolling friction surface between the raw materials driven by each other increases, which is more conducive to breaking the bridge structure. After the bridge structure is broken, the hydraulic rod 912 drives the upper premixing structure 91 and the middle mixing structure 92 to return to the original position, and the next time the bridge phenomenon occurs, it will start the operation again.

[0067] As shown in Figure 10 , Figure 11 and Figure 12 , the lower extrusion structure 93 includes a mounting frame 934, both ends of the mounting frame 934 are fixed on the inner wall of the material box 261, and the mounting frame 934 is provided with a lower shaft 931 at the center through a rotating seat. The top of the lower shaft 931 is provided with a torque sensor 938, the torque sensor 938 is fixed on the mounting frame 934 through a side rod, and the top of the torque sensor 938 is provided with a connector 939, the connector 939 is sleeved with the middle shaft 921, the inner cavity of the connector 939 is matched with the outer diameter of the middle shaft 921, and meanwhile, the left and right sides of the inner cavity are provided with a sliding groove 9391, and the sliding block 9213 at the bottom of the middle shaft 921 is located in the sliding groove 9391;

[0068] The lower shaft 931 is provided with a bevel gear 935 below the mounting frame 934, the bevel gear 935 engages with a transmission rod 936, the transmission rod 936 extends to the outside of the material box 261 through the side wall of the material box 261, and the transmission rod 936 is rotatably connected with the side wall of the material box 261. The driving motor 937 is arranged at the end of the transmission rod 936, and the driving motor 937 is installed on the outer side wall of the material box 261 through a motor frame;

[0069] The driving motor 937 works to drive the transmission rod 936 to rotate, the transmission rod 936 meshes with the bevel gear 935 to rotate, and then drives the lower shaft 931 to rotate, the rotation of the lower shaft 931 drives the shaft of the torque sensor 938 to rotate, and drives the connector 939 fixedly connected thereto to rotate, the connector 939 drives the middle shaft 921 to rotate, if the bridging phenomenon occurs, the resistance between the raw materials increases, the rotating torque of the middle shaft 921 is detected by the torque sensor 938, so as to trigger the hydraulic rod 912 to move downward to break the bridging phenomenon;

[0070] The lower shaft 931 is internally provided with an air inlet cavity 9311, the bottom of the air inlet cavity 9311 is connected with an air inlet pipe 9312 through a rotary sealing joint, the outer end of the air inlet pipe 9312 extends out of the material box 261, and the air inlet pipe 9312 can be connected with an external heated gas source, and the heating of the gas source can utilize the waste heat emitted by the extrusion cylinder 23;

[0071] The upper end of the air inlet cavity 9311 extends into the shaft of the torque sensor 938, and the air inlet cavity 9311 is communicated with the cavity 9211 through the connecting pipe 10, so that the airflow in the air inlet cavity 9311 enters the cavity 9211 and is then conveyed into the inner groove 9221;

[0072] The lower shaft 931 is provided with two sections of spiral feeders 932 distributed upward and downward, which uniformly discharge the raw materials at the bottom of the material box 261 into the feeder 25, and two symmetrical extruders 933 are further arranged between the spiral feeders 932, the extruders 933 can rotate with the lower shaft 931, and expand outward under the action of centrifugal force, so as to extrude and compact the raw materials at the bottom of the material box 261, eliminate the gaps between the raw materials, and make the discharging more uniform.

[0073] The extruder 933 comprises a pressing plate 9331, which is an arc-shaped plate, the bottom of the pressing plate 9331 is rotationally connected with a connecting seat 9332, the connecting seat 9332 is fixed on the lower shaft 931, a spring 9333 is arranged on one side of the top of the pressing plate 9331 close to the lower shaft 931, one end of the spring 9333 is fixed on the outer side wall of the lower shaft 931, and when the lower shaft 931 rotates, the pressing plate 9331 expands outward under the action of centrifugal force, so as to realize the function of compacting the raw materials.

[0074] Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art and related fields without creative work shall belong to the protection scope of the present application. The structures, devices and operation methods not specifically described and explained in the present application are implemented according to the conventional means in the art, unless otherwise specified and limited.

Claims

1. A processing equipment for medical isolation high-breathable water-impermeable microporous film, comprising a dryer (1), a screw extruder (2), a quick-change filter (3), a metering pump (4), an extrusion die (5), a casting roller (6), a thickness gauge (7) and a winding machine (8), and the raw material sequentially passes through the dryer (1), the screw extruder (2), the quick-change filter (3), the metering pump (4), the extrusion die (5), the casting roller (6), the thickness gauge (7) and the winding machine (8) to complete processing, characterized in that: the screw extruder (2) comprises a hopper (26), a rotating body (9) with a dynamic bridge prevention function is installed in the hopper (26), and the rotating body (9) is composed of an upper pre-mixing structure (91), a middle mixing structure (92) and a lower extrusion structure (93); the upper pre-mixing structure (91) and the middle mixing structure (92) cooperate to uniformly mix the raw material and prevent the bridge phenomenon from occurring and to break the bridge phenomenon that has occurred; the lower extrusion structure (93) is used for compacting and uniformly feeding the material, and cooperates with the middle mixing structure (92) to realize dust removal and preheating of the raw material by connecting an external hot gas flow; the middle mixing structure (92) comprises a middle shaft (921), the middle shaft (921) is sleeved with an inner tooth ring (922), the outer side of the inner tooth ring (922) is provided with an outer tooth ring (923), the outer side of the inner tooth ring (922) is provided with teeth, the inside of the outer tooth ring (923) is provided with teeth, the outer side of the outer tooth ring (923) is provided with a sliding ring, the sliding ring is embedded in the inner wall of a material box (261), a plurality of intermediate gears (924) are arranged between the outer tooth ring (923) and the inner tooth ring (922), and the intermediate gears (924) are installed on the inner wall of the material box (261) through fixing rods (925); the middle shaft (921) is internally provided with a cavity (9211), the side wall of the cavity (9211) is provided with a spray hole (9212), the inner tooth ring (922) is internally provided with an inner groove (9221), the inner groove (9221) is communicated with the spray hole (9212), a plurality of gas outlet holes (9222) are formed in the top of the inner groove (9221), and the upper surfaces of the plurality of gas outlet holes (9222) are covered with a mesh cover (926); there is a discharging gap between the outer tooth ring (923) and the inner tooth ring (922), and two kinds of rotating forces in opposite directions can bring about mutual friction and rolling of the materials. The screw extruder (2) further comprises a distribution box (21), the bottom of the distribution box (21) is provided with a base (22), the upper end of the distribution box (21) is provided with an extrusion cylinder (23), the inlet of the extrusion cylinder (23) is provided with a driving structure (24), the outlet of the extrusion cylinder (23) is connected with the quick-change filter (3), the upper end of the driving structure (24) is provided with a feeder (25), and the top of the feeder (25) is installed with the hopper (26); the hopper (26) comprises a material box (261), the rear side of the material box (261) is provided with a fixed plate (262), the bottom of the fixed plate (262) is fixed to the top of the distribution box (21), the upper end left side of the material box (261) is provided with a feeding pipe (263), and the upper end right side of the material box (261) is installed with a dust removal pipe (264). ​ ​ ​ ​ ​ 2. The processing equipment of a medical isolation high-air-permeability waterproof micro-porous film according to claim 1, characterized in that, ​ ​ 3. The processing device of a medical isolation high-air-permeability water- impermeability microporous film according to claim 1, characterized in that, The upper segment premixing structure (91) comprises an upper shaft (911), the top of the upper shaft (911) is rotatably connected with a hydraulic rod (912) through a bearing seat, the hydraulic rod (912) is fixedly installed on the top of the material box (261), a spiral blade (913) is installed on the outer side of the upper shaft (911), the spiral blade (913) is in a whole conical structure, the outer diameter thereof gradually decreases from top to bottom, a plurality of through holes (914) are formed in the spiral blade (913), and a plurality of stirring rods (915) are arranged at the bottom of the spiral blade (913).

4. The processing device of a medical isolation high-air-permeability water- impermeability microporous film according to claim 3, characterized in that, The bottom of the upper shaft (911) is fixedly connected with the middle segment mixing structure (92).

5. The processing device of a medical isolation high-air-permeability water- impermeability microporous film according to claim 1, characterized in that, The bottom of the middle shaft (921) is provided with sliding blocks (9213) on the left and right sides, the middle shaft (921) is connected with the lower segment extrusion structure (93) and can move up and down in the lower segment extrusion structure (93) and rotate with the rotation of the lower segment extrusion structure (93).

6. The processing device of a medical isolation high-air-permeability water- impermeability microporous film according to claim 5, characterized in that, The lower segment extrusion structure (93) comprises a mounting frame (934), both ends of the mounting frame (934) are fixed on the inner wall of the material box (261), a lower shaft (931) is installed at the center of the mounting frame (934) through a rotating seat, a torque sensor (938) is arranged at the top of the lower shaft (931), the torque sensor (938) is fixed on the mounting frame (934) through a side rod, a connector (939) is arranged at the top of the torque sensor (938), the connector (939) is sleeved with the middle shaft (921), the inner cavity of the connector (939) is matched with the outer diameter of the middle shaft (921), sliding grooves (9391) are arranged on the left and right sides of the inner cavity, and the sliding blocks (9213) at the bottom of the middle shaft (921) are located in the sliding grooves (9391).

7. The processing device of a medical isolation high-air-permeability water- impermeability microporous film according to claim 6, characterized in that, A bevel gear (935) is arranged on the lower shaft (931) below the mounting frame (934), the bevel gear (935) meshes with a transmission rod (936), the transmission rod (936) extends to the outside of the material box (261) through the side wall of the material box (261) and is rotatably connected with the side wall of the material box (261), and a driving motor (937) is arranged at the end of the transmission rod (936). An air inlet cavity (9311) is arranged in the lower shaft (931), the bottom of the air inlet cavity (9311) is connected with an air inlet pipe (9312) through a rotary sealing joint, the upper end of the air inlet cavity (9311) extends to the shaft of the torque sensor (938), and the air inlet cavity (9311) is communicated with the cavity (9211) through a connecting pipe (10).

8. The processing device of a medical isolation high-air-permeability water- impermeability microporous film according to claim 7, characterized in that, Two segments of spiral feeders (932) are arranged on the lower shaft (931) in a vertical distribution, two left-right symmetrical extruders (933) are arranged between the two spiral feeders (932), the extruder (933) comprises an arc-shaped plate-shaped pressing plate (9331), the bottom of the pressing plate (9331) is rotatably connected with a connecting seat (9332), the connecting seat (9332) is fixed on the lower shaft (931), a spring (9333) is arranged on the side of the top of the pressing plate (9331) close to the lower shaft (931), and one end of the spring (9333) is fixed on the outer side wall of the lower shaft (931).

9. A process for the production of a medical barrier high gas permeable water impermeable microporous film, using the processing apparatus according to any one of claims 1 to 8, characterized in that: The specific steps are as follows: The raw materials are pretreated and mixed, and then the mixed raw materials are sent into a dryer (1) for drying and dehumidification; The dried and mixed materials are then sent into a screw extruder (2) to convert the solid plastic particles into molten polymer by shearing and heating, and the molten material is filtered by a quick-change filter (3) and then sent into a metering pump (4) connected thereto; The metering pump (4) can control the volume of the molten material delivered per unit time very accurately and deliver the molten material into an extrusion die (5); The molten material in the extrusion die (5) is extruded through a die lip to form a molten film with a required width and initial thickness, the high-temperature molten film extruded from the extrusion die (5) is attached to the surface of a casting roller (6) rotating at a high speed and internally provided with a cooling medium to shape the molten material into a solid film, and the film after being cooled and shaped can be processed to have micron-level apertures by a laser processing device integrated on one side of the discharge end of the casting roller (6); The processed film is detected by a thickness gauge (7) and then wound into a mother roll by a winding machine (8) for subsequent reprocessing.

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