Processing equipment and process of medical isolation high-breathability water-seepage-prevention microporous film

Abstract

The invention relates to the technical field of film processing, in particular to processing equipment and process for a medical isolation high-breathability water-seepage-prevention microporous film, raw materials sequentially pass 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 to be processed, and the screw extruder comprises a hopper; a rotating body with a dynamic anti-bridging function is mounted in the hopper and consists of an upper-section premixing structure, a middle-section uniform mixing structure and a lower-section extruding structure. An upper-section premixing structure of the rotating body collapses a primary bridging layer through a conical spiral blade and a stirring rod, a middle-section uniform mixing structure destroys particle aggregation through shearing force generated by reverse rotation of an inner / outer gear ring, and after the bridging phenomenon occurs, the inner / outer gear ring and the middle-section uniform mixing structure are separated by detecting the change of torque force. And the hydraulic rod is automatically started to drive the upper-section premixing structure and the middle-section uniform mixing structure to move downwards at the same time to form mechanical intervention, so that the bridging phenomenon is prevented and eliminated in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of thin film processing, and particularly relates to a processing device and process for a medical isolation highly breathable and water-proof microporous film. Background Art

[0002] A variety of equipment is required in thin film processing. Generally, it needs to be pre-mixed and homogenized, dried, and then added to the hopper. During the processing of the raw materials in the hopper by the extruder, they rely on their own gravity to move down and enter the feed inlet of the extruder. There may be problems such as material blockage, moisture absorption, and uneven mixing of the raw materials in the hopper.

[0003] For example, Chinese Patent CN2024204857963 discloses an extruder with an anti-blocking hopper, including 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 materials. A first sliding groove is provided on the hopper, the rotating block is rotatably connected in the first sliding groove, a rack is provided on the rotating block, and the rack meshes with the gear. It solves the problem that the feeding funnel of the extruder lacks a simple and efficient anti-blocking mechanism, and plastic particle raw materials are prone to blockage and bridging phenomena at the necking 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 patent only achieves the preventive effect on the bridging phenomenon through the rotating anti-blocking mechanism. Prevention can only reduce the probability of its occurrence and cannot completely avoid the formation of the bridging phenomenon. Once the arch structure is formed, since it does not have the ability to destroy it, manual operation is required for destruction, which is not convenient and efficient. At the same time, the raw materials may be affected by moisture during long-term placement, and moisture absorption will exacerbate the possibility of the bridging phenomenon and increase its probability. Therefore, those skilled in the art have provided a processing device and process for a medical isolation highly breathable and water-proof microporous film to solve the above-mentioned problems. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a processing device for a medical isolation highly breathable and water-proof microporous film, including 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 raw materials are processed in sequence through the dryer, the screw extruder, the quick-change filter, the metering pump, the extrusion die head, the casting roller, the thickness gauge, and the winding machine; 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 pre-mixing structure, a middle homogenizing structure, and a lower material extrusion structure; The upper pre-mixing structure and the middle homogenizing structure cooperate to homogenize the raw materials, prevent the generation of the bridging phenomenon, and break the existing bridging phenomenon; The lower section material extrusion structure is used to compress the material and feed it at a uniform speed, and connect the external hot air flow to cooperate with the middle section mixing structure to achieve raw material dust removal and preheating.

[0006] Preferably, the screw extruder further includes a distribution box, a base is arranged at the bottom of the distribution box, an extrusion barrel is arranged at the upper end of the distribution box, a driving structure is arranged at the inlet of the extrusion barrel, a quick-change filter is connected to the outlet thereof, a feeder is arranged at the upper end of the driving structure, and a hopper is installed at the top of the feeder; The hopper includes a hopper box, a fixing plate is arranged at the rear side of the hopper box, the bottom of the fixing plate is fixed on the top of the distribution box, a feed pipe is arranged at the left side of the upper end of the hopper box, and a dust exhaust pipe is installed at the right side of the upper end of the hopper box.

[0007] Preferably, the structure of the upper section premixing structure includes an upper shaft, a hydraulic rod is rotatably connected to the top of the upper shaft through a bearing seat, the hydraulic rod is fixedly installed on the top of the hopper box, spiral blades are installed on the outer side of the upper shaft, the spiral blades are integrally in a conical structure, and its outer diameter gradually decreases from top to bottom. A plurality of through holes are opened on the spiral blades, and a plurality of stirring rods are further arranged at the bottom of the spiral blades.

[0008] Preferably, the bottom of the upper shaft is fixedly connected to the middle section mixing structure. The middle section mixing structure includes a middle shaft, an internal gear ring is sleeved on the middle shaft, an external gear ring is arranged outside the internal gear ring, teeth are arranged on the outer side of the internal gear ring, teeth are arranged inside the external gear ring, a sliding ring is arranged outside the external gear ring, the sliding ring is embedded in the inner wall of the hopper box, and a plurality of intermediate gears are arranged between the external gear ring and the internal gear ring. The intermediate gears are installed on the inner wall of the hopper box through fixing rods.

[0009] Preferably, a cavity is arranged inside the middle shaft, spray holes are arranged on the side wall of the cavity, an inner groove is opened inside the internal gear ring, the inner groove is communicated with the spray holes, a plurality of air outlet holes are opened at the top of the inner groove, and a mesh cover is covered on the upper surface of the plurality of air outlet holes.

[0010] Preferably, sliders are arranged on both the left and right sides at the bottom of the middle shaft. The middle shaft is connected to the lower section material extrusion structure and can move up and down inside the lower section material extrusion structure and rotate with the rotation of the lower section material extrusion structure.

[0011] Preferably, the lower section material extrusion structure includes an installation frame, both ends of the installation frame are fixed on the inner wall of the hopper box, a lower shaft is installed at the center of the installation frame through a rotating seat, a torque sensor is arranged at the top of the lower shaft, the torque sensor is fixed on the installation frame through a side rod, a connector is arranged at the top of the torque sensor, the connector is sleeved with the middle shaft, the inner cavity of the connector is adapted to the outer diameter of the middle shaft, sliding grooves are arranged on both the left and right sides of the inner cavity, and the sliders at the bottom of the middle shaft are located in the sliding grooves.

[0012] Preferably, a bevel gear is arranged on the lower shaft below the installation frame, the bevel gear meshes with a transmission rod, the transmission rod passes through the side wall of the hopper box and extends to the outside thereof, the transmission rod is rotatably connected to the side wall of the hopper box, and a driving motor is arranged at the end of the transmission rod; An air intake cavity is set inside the lower shaft. The bottom of the air intake cavity is connected to the air intake pipe through a rotary sealing joint. The upper end of the air intake cavity extends into the shaft of the torque sensor. The air intake cavity is connected to the cavity through a connecting pipe.

[0013] Preferably: the lower part of the lower shaft is provided with two sections of screw feeders distributed up and down, and two left-right symmetrical extruders are provided between the two screw feeders. The extruder includes a pressing plate, which is an arc-shaped plate, and its bottom is rotatably connected to the connecting seat. The connecting seat is fixed on the lower shaft, and a spring is provided on the side of the top of the pressing plate close to the lower shaft, and one end of the spring is fixed on the outer wall of the lower shaft.

[0014] In addition, the present invention also discloses a processing technology for a medical isolation, highly breathable, and water-proof microporous film, which uses the above-mentioned processing equipment and has the following specific steps: First, the raw materials are pre-treated and mixed, and then the mixed raw materials are sent to the dryer for drying and dehumidification; The dried and mixed materials are then transported to the screw extruder, where the shearing and heating effects are used to convert the solid plastic particles into molten polymers. The subsequent molten materials are filtered through a quick-change filter and then enter the metering pump connected to it. The metering pump can control the volume of melt delivered per unit time extremely accurately and deliver it to the extrusion die head; The melt from the extrusion die is extruded through the die lip to form a melt film of the desired width and initial thickness. The high-temperature melt curtain extruded from the extrusion die is attached to the surface of a high-speed rotating casting roll with a cooling medium inside, shaping the melt into a solid film. The cooled and shaped film can be processed into micron-level apertures by a laser processing device integrated on the discharge side of the casting roll. After the processed film passes the thickness gauge inspection and is qualified, it is wound into a mother roll by a winder to facilitate subsequent processing.

[0015] Technical effects and advantages of the present invention: 1. In the present invention, the upper premixing structure of the rotating body breaks up the primary bridging layer through conical spiral blades and stirring rods, and the middle mixing structure breaks up particle agglomeration through the shear force generated by the counter-rotating inner and outer gear rings. After bridging occurs, the hydraulic rod is automatically activated by detecting the change in torque force, thereby driving the upper premixing structure and the middle mixing structure to move downward simultaneously to form a mechanical intervention, achieving real-time prevention and elimination of bridging. 2. In the present invention, a hot air flow is introduced into the central axis cavity and ejected through the air outlet of the inner gear ring, so that the raw materials are tumbled in the gear meshing area to enhance mixing and prevent bridging phenomenon, as well as preheating the raw materials to prevent them from getting damp. The rising hot air flow can also carry dust and be discharged through the dust exhaust pipe, thereby improving the processing quality of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the process frame of the present invention; Figure 2 is the three-dimensional view of the screw extruder in the present invention; Figure 3 is the front view of the screw extruder in the present invention; Figure 4 is the structural schematic diagram of the hopper in the present invention; Figure 5 is the structural schematic diagram of the interior of the hopper in the present invention; Figure 6 is the structural schematic diagram of the rotating body in the present invention; Figure 7 is the structural schematic diagram of the upper-stage premixing structure in the present invention; Figure 8 is the partial exploded view of the middle-stage mixing structure in the present invention; Figure 9 is the partial sectional view of the middle-stage mixing structure in the present invention; Figure 10 is the structural schematic diagram of the lower-stage material extrusion structure in the present invention; Figure 11 is the partial sectional view of the connection state of the upper shaft, middle shaft and lower shaft in the present invention; Figure 12 is in the present invention Figure 11 the structural schematic diagram at position A; Figure 13 is the structural schematic diagram of the casting roll in the present invention.

[0017] In the figure: 1. Dryer; 2. Screw extruder; 3. Quick-change filter; 4. Metering pump; 5. Extrusion die head; 6. Casting roll; 7. Thickness gauge; 8. Rewinder; 9. Rotating body; 10. Connecting pipe; 21. Distribution box; 22. Base; 23. Extrusion barrel; 24. Driving structure; 25. Feeder; 26. Hopper; 261. Hopper box; 262. Fixed plate; 263. Feed pipe; 264. Dust exhaust pipe; 91. Upper-stage premixing structure; 92. Middle-stage mixing structure; 93. Lower-stage material extrusion structure; 911. Upper shaft; 912. Hydraulic rod; 913. Spiral blade; 914. Through hole; 915. Stirring rod; 921. Middle shaft; 922. Inner gear ring; 923. Outer gear ring; 924. Intermediate gear; 925. Fixed rod; 926. Mesh cover; 9211. Cavity; 9212. Spray hole; 9213. Slide block; 9221. Inner groove; 9222. Air outlet; 931. Lower shaft; 932. Screw feeder; 933. Extruder; 9331. Pressing plate; 9332. Connecting seat; 9333. Spring; 934. Mounting frame; 935. Bevel gear; 936. Transmission rod; 937. Driving motor; 938. Torque sensor; 939. Connector; 9311. Intake cavity; 9312. Intake pipe; 9391. Slide groove. Detailed implementation manners

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustive or limited to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific purposes. Embodiment 1

[0019] Please refer to Figure 1 and Figure 13 As shown, in this embodiment, a processing device for a medical isolation highly breathable and water-proof microporous film is provided, which includes the following devices. During the processing, a dryer 1, a screw extruder 2, a quick-change filter 3, a metering pump 4, an extrusion die head 5, a casting roller 6, a thickness gauge 7, and a winding machine 8 are used to realize the process from raw materials to winding after processing of the film. Specifically, the raw materials are first pretreated, that is, several different raw materials are mixed evenly to ensure uniform dispersion of components. The mixed raw materials are sent into the dryer 1 for drying and dehumidification, and the water adsorbed or absorbed by the raw material particles is evaporated and removed to ensure that the water content of the raw materials entering the screw extruder 2 meets the processing requirements. It is also possible to independently dry several materials that need to be dehumidified first, and then mix the dried raw materials. The selection can be made according to the actual production needs. Then, the dried and mixed materials are transported into the screw extruder 2. By using its shearing and heating functions, the solid plastic particles are converted into a molten polymer with uniform temperature, pressure, and components. The subsequent molten material is discharged and filtered through the quick-change filter 3. The filter screen inside it intercepts impurities in the melt (such as unmelted particles, carbides, gels, metal chips, environmental pollutants). When the filter screen is blocked and the melt pressure rises to the set upper limit, the quick-change mechanism is activated, and the dirty filter screen assembly that is switched down is removed, and the filter screen is cleaned or replaced. The quick-change filter 3 protects the downstream equipment from being blocked or scratched by impurities, improves the purity of the melt, eliminates "crystal points" or "fish eyes" on the film surface, and ensures the appearance quality and physical properties of the film. 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 precisely controlling the rotational speed of the gears inside the metering pump 4, the volume of the melt delivered to the extrusion die head 5 per unit time can be extremely accurately controlled, and the output fluctuations of the screw extruder 2 can be eliminated; The stable melt flow from the metering pump 4 enters the distribution chamber of the extrusion die head 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 head 5 is precisely attached to the surface of the large-diameter casting roll 6 that rotates at high speed and has a cooling medium flowing inside. Through rapid, uniform, and controllable cooling, the melt is shaped into a solid film. Here, it should be noted that since it is a microporous breathable film being processed, the cooled and shaped film can be processed with micron-sized pores by the laser processing equipment integrated on one side of the discharge end of the casting roll 6; The processed material passes through the thickness gauge 7, which can detect the thickness of the film online, in real time, and non-destructively, understand the production status in real time, and determine whether the product meets the thickness specifications. Finally, the continuously produced film is wound into a master roll smoothly, tightly, and neatly by the winding machine 8. The wound film product can continue with subsequent processing, such as slitting, bag making, printing, compounding, etc. Embodiment 2

[0020] Please refer to Figures 2 to 12 , in this embodiment, the screw extruder 2 in the processing equipment for the medical isolation highly breathable and water-proof microporous film in Embodiment 1 is further improved; As Figure 2 and Figure 3 shown, the screw extruder 2 includes a distribution box 21. A base 22 is provided at the bottom of the distribution box 21, and an extrusion barrel 23 is provided at the upper end of the distribution box 21. A drive structure 24 is provided at the inlet of the extrusion barrel 23, and its outlet is connected to the quick-change filter 3. A feeder 25 is provided at the upper end of the drive structure 24, and a hopper 26 is installed at the top of the feeder 25. The hopper 26 is connected to the external equipment for transporting raw materials. The external raw materials enter the hopper 26, and then enter the extrusion barrel 23 through the feeder 25. The drive structure 24 is started to make the extrusion barrel 23 work, completing the melting and extrusion of the raw materials. The outlet of the extrusion barrel 23 is connected to the quick-change filter 3 to complete the transportation of the material; The specific structure of the hopper 26 is as Figure 4 shown. It includes a material box 261. A fixing plate 262 is provided at the rear side of the material box 261. The bottom of the fixing plate 262 is fixed to the top of the distribution box 21 to assist in supporting the material box 261 and keep it stably placed; On the left side of the upper end of the material box 261, a feed pipe 263 is provided. The feed pipe 263 is connected to the equipment for conveying raw materials externally. The external raw materials enter the material box 261 through the feed pipe 263 for subsequent processing. At the same time, a dust exhaust pipe 264 is installed on the right side of the upper end of the material box 261. The dust exhaust pipe 264 can discharge the dust existing in the raw materials in the material box 261 to the outside, improving the quality of the extruded film; After the raw materials enter the material box 261, as Figure 5 shown, the secondary mixing is realized through the rotating body 9 installed inside the material box 261. At the same time, the rotating body 9 can also prevent the occurrence of the bridging phenomenon of the raw materials in the hopper 26. And, after the bridging phenomenon occurs, it can automatically trigger the destruction function to automatically break the existing bridging phenomenon. Moreover, the rotating body 9 can also realize the functions of dust removal and preheating of the raw materials in the material box 261, avoiding moisture absorption after the raw materials are placed for a long time. Preheating can help the raw materials to be melted faster after entering the extrusion barrel 23; The specific structure of the rotating body 9 is as Figure 5 and Figure 6 shown. It includes an upper-stage premixing structure 91, a middle-stage mixing structure 92 and a lower-stage material extrusion structure 93. The upper-stage premixing structure 91, the middle-stage mixing structure 92 and the lower-stage material extrusion structure 93 are connected to each other from top to bottom. The upper-stage premixing structure 91 and the middle-stage mixing structure 92 interact to mix the raw materials and prevent the occurrence of the bridging phenomenon, and break it after the bridging phenomenon occurs. And the lower-stage material extrusion structure 93 can realize uniform feeding, and compact the raw materials, reducing the gap between the raw materials. At the same time, hot air can be filled inside it. The hot air enters the middle-stage mixing structure 92 through it and then sprays out. The sprayed hot air can also blow the raw materials to make them roll with each other, realizing mixing and reducing the probability of bridging. At the same time, the hot air rises, and the dust in the raw materials during the mixing process is carried away by the air flow together, and then discharged through the dust exhaust pipe 264; As Figure 7 shown, the structure of the upper-stage premixing structure 91 includes an upper shaft 911. The top of the upper shaft 911 is rotationally connected to 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 outside the upper shaft 911. The spiral blade 913 is in an overall conical structure, and its outer diameter gradually decreases from top to bottom. When the upper shaft 911 rotates, it will drive the spiral blade 913 to rotate. Due to its specific structural design, the conical expansion forces the raw materials to be radially dispersed, increasing the mixing effect. The spiral structure can not only realize preliminary mixing of the materials, but also avoid accumulation and prevent bridging, break up the initial bridging layer, and at the same time have a downward pressing and pushing effect. The materials move downward under its push and their own gravity; Moreover, a plurality of through holes 914 are formed in the spiral blade 913. At the same time, a plurality of stirring rods 915 are provided at the bottom of the spiral blade 913. The stirring rods 915 rotate with the rotation of the spiral blade 913, enhancing the effect of stirring the raw materials. The through holes 914 can prevent the spiral blade 913 from blocking the hot air flow surging from the bottom, enabling the rising air flow to better carry away the dust existing in the raw materials during the upward movement and finally discharging it from the dust exhaust pipe 264. The discharged dust is then processed by a dust removal device; As Figure 7 , Figure 8 and Figure 9 shown, the bottom of the upper shaft 911 is fixedly connected to the middle mixing structure 92. The middle mixing structure 92 includes a middle shaft 921. An internal gear ring 922 is sleeved on the middle shaft 921. An external gear ring 923 is provided outside the internal gear ring 922. Teeth are provided on the outside of the internal gear ring 922, and teeth are provided inside the external gear ring 923. At the same time, a sliding ring is provided outside the external gear ring 923, and the sliding ring is embedded in the inner wall of the material box 261. The external gear ring 923 can rotate in the inner wall of the material box 261. Moreover, a plurality of intermediate gears 924 are provided between the external gear ring 923 and the internal gear ring 922. The intermediate gears 924 are installed on the inner wall of the material box 261 through fixing rods 925. Moreover, the intermediate gears 924 are rotatably connected to the fixing rods 925. When the middle shaft 921 rotates, it can drive the internal gear ring 922 to rotate accordingly. The rotation of the internal gear ring 922 will engage the intermediate gears 924 to rotate, so that the intermediate gears 924 can engage the external gear ring 923 to rotate, and its rotation direction is opposite to the rotation direction of the internal gear ring 922. There is a blanking gap between the external gear ring 923 and the internal gear ring 922, which can enable the material to fall. Moreover, the two mutually reverse rotational forces can drive the materials to rub and roll against each other, further mixing the materials while enabling the materials to slide relative to each other. The reverse-acting forces can break up the agglomerated particles through a twisting effect, preventing the formation of bridging; The internal gear ring 922 also has the functions of dust removal and moisture removal. As Figure 9As shown, a cavity 9211 is provided inside the central axis 921, and a nozzle 9212 is provided on the side wall of the cavity 9211. The hot air flow is first filled into the cavity 9211, and then transported to the inside of the inner gear ring 922 by the nozzle 9212. An inner groove 9221 is provided inside the inner gear ring 922, and the inner groove 9221 is connected to the nozzle 9212. A plurality of air outlet holes 9222 are provided on the top of the inner groove 9221, and the upper surface of the plurality of air outlet holes 9222 is covered with a mesh cover 926. The air flow ejected from the nozzle 9212 enters the inner groove 9221, and the air flow in the inner groove 9221 is then discharged from the air outlet holes 92 22 and the mesh cover 926 are discharged, and the rising airflow achieves the effect of dust removal on the raw material, and the ejected airflow is a hot airflow, which flows in the raw material, preheats the raw material, and prevents moisture at the same time. At the same time, its upward blowing effect can suppress the dust remaining in the raw material, preventing it from falling into the extruder body along with the material. The dust can be discharged through the dust exhaust pipe 264, thereby improving the extrusion quality of the material. When the airflow blows, it also accelerates the mutual rolling effect between the raw materials to a certain extent, which promotes the anti-bridging and further mixing of the raw materials, thereby improving the anti-bridging prevention effect; Sliders 9213 are provided on the left and right sides of the bottom of the middle shaft 921. The middle shaft 921 is connected to the lower extrusion structure 93. It 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 serves as the output structure of the main force. Its rotation drives the upper premixing structure 91 and the middle mixing structure 92 to rotate, thereby achieving mixing and preventing bridging. After bridging occurs, the upper premixing structure 91 will sense the change in the resistance of the raw materials in the material box 261 (the structure for detecting the change in resistance will be described below). While the upper premixing structure 91, the middle mixing structure 92 and the lower extrusion structure 93 continue to rotate, the hydraulic rod at the top 912 will drive the upper premixing structure 91 to move downward, and at the same time the middle shaft 921 will move downward and drive the inner gear ring 922 to move downward. When the above structure moves downward, the bridge structure formed will be destroyed and broken, thereby achieving the purpose of breaking. In this process, in addition to the vertical movement of the spiral blades 913 and the inner gear ring 922, after the inner gear ring 922 moves downward, the height difference between it and the outer gear ring 923 changes, so that the rolling friction surface between the raw materials driven by each other increases, which is more conducive to destroying 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 back to their original positions. The next time the bridge phenomenon occurs again, it starts the operation again. like Figure 10 、 Figure 11 and Figure 12As shown in the figure, the lower material 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. The lower shaft 931 is installed at the center of the mounting frame 934 through a rotating seat. A torque sensor 938 is provided 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 provided at the top of the torque sensor 938. The connector 939 is sleeved on the middle shaft 921. The inner cavity of the connector 939 is adapted to the outer diameter of the middle shaft 921. At the same time, sliding grooves 9391 are provided on the left and right sides of the inner cavity. The slider 9213 at the bottom of the middle shaft 921 is located in the sliding grooves 9391; A bevel gear 935 is provided on the lower shaft 931 below the mounting frame 934. The bevel gear 935 meshes with the transmission rod 936. The transmission rod 936 passes through the side wall of the material box 261 and extends to the outside thereof. The transmission rod 936 is rotatably connected to the side wall of the material box 261. And a driving motor 937 is provided at the end of the transmission rod 936. The driving motor 937 is installed on the outer side wall of the material box 261 through a motor frame; When the driving motor 937 works, it drives 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 will drive the shaft of the torque sensor 938 to rotate together, and drive the connector 939 fixed thereto to rotate. The connector 939 will cause the middle shaft 921 to rotate accordingly. If a bridging phenomenon occurs, the resistance between the raw materials increases. The rotational torque of the middle shaft 921 will be detected by the torque sensor 938, thereby triggering the action of the hydraulic rod 912 to move downward to break the bridging phenomenon; An air inlet cavity 9311 is arranged inside the lower shaft 931. The bottom of the air inlet cavity 9311 is connected to an air inlet pipe 9312 through a rotary seal joint. The outer end of the air inlet pipe 9312 extends out of the material box 261. The air inlet pipe 9312 can be connected to an externally heated air source. The heating of the air source can utilize the waste heat dissipated by the extrusion barrel 23; The upper end of the air inlet cavity 9311 extends into the shaft of the torque sensor 938. The air inlet cavity 9311 is communicated with the cavity 9211 through a connecting pipe 10, enabling air flow to enter the cavity 9211 from the air inlet cavity 9311 and then be conveyed to the inner groove 9221; Two spiral feeders 932 are arranged up and down at the lower part of the lower shaft 931 to evenly discharge the raw materials at the bottom of the material box 261 and convey them to the feeder 25. Moreover, two symmetrically arranged extruders 933 are provided between the spiral feeders 932. The extruders 933 can rotate with the lower shaft 931. They expand outward by the action of centrifugal force, thereby having an extrusion and compaction effect on the raw materials at the bottom of the material box 261, eliminating the gaps between the raw materials and making the feeding more uniform; The extruder 933 includes a pressing plate 9331 which is an arc-shaped plate. The bottom of the pressing plate 9331 is rotatably connected to a connecting seat 9332. The connecting seat 9332 is fixed on the lower shaft 931. And a spring 9333 is provided 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. When the lower shaft 931 rotates, the pressing plate 9331 expands outwards under the action of centrifugal force, thereby achieving the effect of pressing the raw materials.

[0021] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A processing device for a medical isolation highly breathable and water - impermeable microporous film, comprising a dryer (1), a screw extruder (2), a quick - change filter (3), a metering pump (4), an extrusion die head (5), a casting roller (6), a thickness gauge (7) and a winding machine (8). The raw materials are processed in sequence through the dryer (1), the screw extruder (2), the quick - change filter (3), the metering pump (4), the extrusion die head (5), the casting roller (6), the thickness gauge (7) and the winding machine (8). It is characterized in that: The screw extruder (2) includes a hopper (26). A rotating body (9) with a dynamic anti - bridging function is installed in the hopper (26). The rotating body (9) is composed of an upper - stage premixing structure (91), a middle - stage mixing structure (92) and a lower - stage material - extruding structure (93). The upper - stage premixing structure (91) and the middle - stage mixing structure (92) cooperate to mix the raw materials, prevent the generation of bridging phenomena and break the existing bridging phenomena. The lower - stage material - extruding structure (93) is used to compact the material and feed it at a uniform speed, and cooperate with the external hot air flow and the middle - stage mixing structure (92) to achieve dust removal and pre - heating of the raw materials.

2. The processing equipment for a medical isolation highly breathable and water-proof microporous film according to claim 1, characterized in that, The screw extruder (2) further includes a distribution box (21). A base (22) is arranged at the bottom of the distribution box (21). An extrusion barrel (23) is arranged at the upper end of the distribution box (21). A driving structure (24) is arranged at the inlet of the extrusion barrel (23), and its outlet is connected to the quick - change filter (3). A feeder (25) is arranged at the upper end of the driving structure (24), and a hopper (26) is installed at the top of the feeder (25). The hopper (26) includes a hopper box (261). A fixing plate (262) is arranged at the rear side of the hopper box (261). The bottom of the fixing plate (262) is fixed on the top of the distribution box (21). A feed pipe (263) is arranged at the upper left side of the hopper box (261), and a dust exhaust pipe (264) is installed at the upper right side of the hopper box (261).

3. The processing equipment for a medical isolation highly breathable and water-proof microporous film according to claim 1, characterized in that, The structure of the upper - stage premixing structure (91) includes an upper shaft (911). The top of the upper shaft (911) is rotationally connected to a hydraulic rod (912) through a bearing seat. The hydraulic rod (912) is fixedly installed on the top of the hopper box (261). A spiral blade (913) is installed on the outer side of the upper shaft (911). The spiral blade (913) is in an overall conical structure, and its outer diameter gradually decreases from top to bottom. A number of through - holes (914) are opened on the spiral blade (913), and a number of stirring rods (915) are also arranged at the bottom of the spiral blade (913).

4. The processing equipment for a medical isolation highly breathable and water-proof microporous film according to claim 3, characterized in that, The bottom of the upper shaft (911) is fixedly connected to the middle - stage mixing structure (92). The middle - stage mixing structure (92) includes a middle shaft (921). An internal gear ring (922) is sleeved on the middle shaft (921). An external gear ring (923) is arranged outside the internal gear ring (922). Teeth are arranged on the outer side of the internal gear ring (922), and teeth are arranged inside the external gear ring (923). A sliding ring is arranged on the outer side of the external gear ring (923), and the sliding ring is embedded in the inner wall of the hopper box (261). A number of intermediate gears (924) are arranged between the external gear ring (923) and the internal gear ring (922). The intermediate gears (924) are installed on the inner wall of the hopper box (261) through fixing rods (925).

5. The processing equipment for a medical isolation highly breathable and water-proof microporous film according to claim 4, characterized in that, The central shaft (921) is internally provided with a cavity (9211), and spray holes (9212) are arranged on the side wall of the cavity (9211). An inner groove (9221) is formed inside the inner gear ring (922). The inner groove (9221) communicates with the spray holes (9212). A plurality of air outlet holes (9222) are formed at the top of the inner groove (9221), and a mesh cover (926) covers the upper surfaces of the plurality of air outlet holes (9222).

6. The processing equipment for a medical isolation highly breathable and water-proof microporous film according to claim 5, characterized in that, Sliders (9213) are arranged on both the left and right sides of the bottom of the central shaft (921). The central shaft (921) is connected to the lower extrusion structure (93) and can move up and down within the lower extrusion structure (93) and rotate along with the rotation of the lower extrusion structure (93).

7. The processing equipment for a medical isolation highly breathable and water-proof microporous film according to claim 6, characterized in that, 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). 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 on the central shaft (921). The inner cavity of the connector (939) is adapted to the outer diameter of the central shaft (921). Chute grooves (9391) are arranged on both the left and right sides of the inner cavity. The sliders (9213) at the bottom of the central shaft (921) are located in the chute grooves (9391).

8. The processing equipment for a medical isolation highly breathable and water-proof microporous film according to claim 7, 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) passes through the side wall of the material box (261) and extends to the outside thereof. The transmission rod (936) is rotatably connected to the side wall of the material box (261). A driving motor (937) is arranged at the end of the transmission rod (936). An air inlet cavity (9311) is arranged inside the lower shaft (931). The bottom of the air inlet cavity (9311) is connected to an air inlet pipe (9312) through a rotary seal joint. The upper end of the air inlet cavity (9311) extends into the shaft of the torque sensor (938). The air inlet cavity (9311) communicates with the cavity (9211) through a connecting pipe (10).

9. The processing equipment for a medical isolation highly breathable and water-proof microporous film according to claim 8, characterized in that, Two sections of spiral feeders (932) distributed vertically are arranged at the lower part of the lower shaft (931). Two squeezers (933) symmetrically arranged left and right are arranged between the two spiral feeders (932). The squeezer (933) includes a pressing plate (9331). The pressing plate (9331) is an arc-shaped plate, and its bottom is rotatably connected to 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).

10. A processing technology for a medical isolation highly breathable and water-proof microporous film, using the processing equipment described in any one of claims 1-9, characterized in that: The specific steps are as follows: First, the raw materials are pretreated to be mixed evenly, and the evenly mixed raw materials are sent into a dryer (1) for drying and dehumidification. Then, the dried and mixed material is conveyed into the screw extruder (2), and through its shearing and heating effects, the solid plastic particles are transformed into molten polymers. Subsequently, the molten material passes through the quick-change filter (3) and then enters the metering pump (4) connected to it; The metering pump (4) can extremely precisely control the volume of the melt conveyed per unit time and convey it into the extrusion die head (5); The melt in the extrusion die head (5) 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 head (5) adheres to the surface of the casting roll (6) that rotates at high speed and has a cooling medium flowing through it internally, shaping the melt into a solid film. The film after cooling and shaping can be processed with micron-sized apertures by the laser processing equipment integrated on one side of the discharge end of the casting roll (6); After being detected as qualified by the thickness gauge (7), the processed film is wound into a master roll by the winding machine (8), which facilitates subsequent reprocessing.

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