Small medical polyurethane production device

Abstract

A small medical polyurethane production device comprises a body, the body comprises a main motor, a first screw assembly controlled by the main motor to rotate and a feeding machine for injecting raw materials into the first screw assembly, and the first screw assembly comprises a first screw machine barrel and two first screws arranged in the first screw machine barrel and meshed with each other; the first screw comprises a feeding section, a first solid conveying section, a first melting and plasticizing section, a first melt conveying section, a first mixing section, a first vacuum exhaust section and a first discharging section which are sequentially connected and integrally formed. According to the small medical polyurethane production device, the structural design is reasonable, the plasticizing and uniform mixing effects of materials are optimized, the first screw assembly is composed of the two first screws which are meshed with each other, and due to the arrangement of the double screws, the preparation of polyurethane is lengthened, and the production efficiency is improved. The chemical components are mixed more uniformly, and the chemical reaction is more sufficient.

Description

Technical Field

[0001] The utility model relates to the technical field of biomedical materials, in particular to a small-scale production device for medical polyurethane. Background Art

[0002] With the development and progress of society, the application of new materials is becoming more and more extensive. The application of polymer materials in the medical field is one of its development directions. Polyurethane materials, due to their special chemical structure, not only have good physical and mechanical properties, good biocompatibility and blood compatibility, but also have good processability and will not cause harm to the human body after long-term use. Therefore, they are widely used in the medical field.

[0003] Polyurethane is a type of polymer that is mainly synthesized from polyisocyanates, high molecular weight polyols and chain extenders and has coexisting flexible segments and rigid segments. The incomplete compatibility of the flexible segments and rigid segments forms a microphase separation structure of polyurethane. A large number of studies have shown that it is this microphase separation structure that gives it excellent blood compatibility and physical and mechanical properties. Currently, there are many brands of polyurethane used in biomedical engineering, such as Biome, Pellethane (Vpjohm Chemical Company) and TECOFLEX (Thermedies Company).

[0004] But the problem is that due to the small amount of research and development of medical polyurethane and the frequent changes in varieties, from the perspective of chemical reactions, the existing preparation equipment has a short preparation process, making it difficult for the raw materials to complete the chemical reaction, making it difficult for the quality standards of medical polyurethane to meet the usage standards or even fail to meet the standards. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of this, the embodiments of this specification provide a small-scale medical polyurethane production device with a long preparation process, uniform mixing of chemical components, and sufficient chemical reaction.

[0007] (II) Technical solution

[0008] In order to solve the technical problems, the utility model provides the following technical solutions: a small-scale medical polyurethane production device, comprising a main body, the main body comprising a main motor, a first screw assembly controlled to rotate by the main motor, and a feeder for injecting raw materials into the first screw assembly, the first screw assembly comprising a first screw barrel, and two mutually meshing first screws arranged in the first screw barrel, the first screw comprising a feeding section, a first solid conveying section, a first melt plasticizing section, a first melt conveying section, a first mixing section, a first vacuum exhaust section, and a first discharging section which are sequentially connected and integrally formed.

[0009] Compared with the prior art, the utility model has the following advantages: through the setting of the feeding section, the first solid conveying section, the first melt plasticizing section, the first melt conveying section, the first mixing section, the first vacuum exhaust section, and the first discharging section, the structural design is reasonable, and the plasticizing and uniform mixing effects of the materials are optimized. Secondly, the first screw assembly is composed of two mutually meshing first screws. The setting of the twin screws makes the preparation of the polyurethane longer, so that the chemical components are mixed more evenly and the chemical reaction reacts more fully. The setting of the twin screws has good heat transfer, large melting capacity, strong exhaust capacity and good control of material temperature.

[0010] In some embodiments, the first solid conveying section is provided with thread sections 48 / 24-2, 28 / 28, 24 / 24-2, 18 / 18-2 in sequence, the first melt plasticizing section is provided with thread sections 30° / 7 / 28, 45° / 5 / 24, 16 / 16, 12 / 12 in sequence, the first melt conveying section is provided with thread sections 45° / 5 / 24-2, 28 / 28, 24 / 24-2, 16 / 16 in sequence, the first mixing section is provided with thread sections 45° / 5 / 24-2, 28 / 28, 24 / 24-2, 16 / 16 in sequence, The thread sections are 45° / 5 / 24, 60° / 16, 45° / 5 / 24, 24 / 24, 16 / 16. The first vacuum exhaust section includes thread sections 45° / 5 / 24-2, 12 / 12, 18 / 28-2. The first discharging section is provided with thread sections 24 / 24-3, 20 / 20, 18 / 18-2, 12 / 12-2 in sequence. Through the improvements, the structural design of the first screw assembly is more reasonable and the mixing effect is better.

[0011] In some embodiments, the main body includes a second screw assembly, the second screw assembly includes a second screw, and the second screw assembly is set as a single screw. The raw material enters the second screw assembly after passing through the first screw assembly. Through the improvement, when the material passes through the first screw assembly and then passes through the second screw assembly set by a single screw, the material is further matured, the reaction is more complete, and preparations are made for the next process.

[0012] In some embodiments, the second screw includes a feed inlet section, a second solid conveying section, a second melt plasticizing section, a second melt conveying section, a natural exhaust section, a side feeding section, a third melt plasticizing section, a third mixing section, a second vacuum exhaust section, and a second discharge section, which are connected in sequence and formed as one piece. Through the improvements, the material reaction is more sufficient, the reaction stroke is longer, and the mixing effect is better.

[0013] In some embodiments, the feed inlet section is sequentially provided with thread sections 32 / 32, 48 / 48, 48 / 48, 48 / 48, 32 / 32, 32 / 32, the second solid conveying section is sequentially provided with thread sections 32 / 32, 22 / 22, 22 / 22, 22 / 22, 22 / 22, the second melt plasticizing section is sequentially provided with thread sections 22 / 22, 30° / 7 / 48, 45° / 5 / 32, 45° / 5 / 32, 32 / 32, the second melt conveying section is sequentially provided with thread sections 22 / 22, 45° / 5 / 32, 60° / 4 / 22, 60° / 4 / 22, 22 / 11, 48 / 48, the natural exhaust section includes thread sections 48 / 48, 48 / 48, 48 / 48, The side feeding section is provided with thread sections 48 / 48, 48 / 48, and 32 / 32 in sequence, the third melt plasticizing section is provided with thread sections 22 / 22, 22 / 22, 22 / 22, 45° / 5 / 32, 60° / 4 / 22, 22 / 22 in sequence, the third mixing section is provided with thread sections 22 / 22, 45° / 5 / 32, 60° / 4 / 22, 60° / 4 / 22, 90° / 5 / 32 in sequence, the second vacuum exhaust section includes thread sections 22 / 11, 48 / 48, and 48 / 48, and the second discharging section includes thread sections 32 / 32, 22 / 22, 22 / 22, 22 / 22, and 22 / 22. Through the improvement, the structural design of the second screw is more reasonable and the mixing effect is better.

[0014] In some embodiments, the main body includes a conveyor belt for transmission after extrusion by the second screw assembly. The conveyor belt is made of tetrafluoroethylene material. Through the improvement, the tetrafluoroethylene material is non-sticky and has the smallest surface tension among solid materials without adhering to any substance, thereby avoiding adhesion of polyurethane to the conveyor belt.

[0015] In some embodiments, an air dryer is provided on the conveyor belt to air cool the raw materials extruded through the second screw assembly. Through the improvement, polyurethane will hydrolyze when cooled in water, and this situation can be avoided by air cooling.

[0016] In some embodiments, a heating tube is sleeved on the outer wall of the first screw assembly. Through the improvement, the material in the first screw assembly is heated and melted by the heating tube, so that the material reacts more quickly and the chemical reaction is more complete.

[0017] In some embodiments, the feeder is a conical double feeder, which, through the improvements described above, has good sealing performance without powder leakage, and has the advantages of continuous material conveying and automatic cleaning functions.

[0018] (III) Beneficial effects

[0019] The utility model provides a small-scale production device for medical polyurethane. Through the arrangement of a feeding section, a first solid conveying section, a first melt plasticizing section, a first melt conveying section, a first mixing section, a first vacuum exhaust section, and a first discharging section, the structure is reasonably designed and the effects of plasticizing and uniformly mixing the materials are optimized. Secondly, the first screw assembly is composed of two mutually meshing first screws. The arrangement of the twin screws makes the preparation of the polyurethane longer. The heating tube heats and melts the materials in the first screw assembly, so that the chemical components are mixed more evenly and the chemical reaction reacts more fully. Moreover, since the research and development amount of medical polyurethane is small, and the materials pass through the first screw assembly and then pass through the second screw assembly arranged by the single screw, the materials are further matured and the reaction is more sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of the first screw assembly of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the first screw assembly of the utility model from another angle;

[0023] Figure 3 It is a structural schematic diagram of the first screw of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the second screw assembly of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the second screw assembly of the utility model from another angle;

[0026] Figure 6 It is a structural schematic diagram of the second screw member of the utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the conveyor belt and the air dryer of the utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the heating tube of the utility model;

[0029] Fig. 9 This is a schematic structural diagram of the heating tube of the utility model from another angle;

[0030] Fig.10It is a structural schematic diagram of the crusher of the utility model;

[0031] Fig.11 It is a structural schematic diagram of a pelletizer of the utility model;

[0032] Fig.12 It is a structural schematic diagram of the vibrating screen of the utility model;

[0033] Fig.13 This is a schematic diagram of the structure of the dryer and the silo in the utility model;

[0034] Fig.14 The utility model is a schematic diagram of the structure of the pelletizer, vibrating screen, dryer and silo.

[0035] In the figure: 1. Crusher; 2. Feeder; 3. Main motor; 4. First screw assembly; 4.1. First screw barrel; 4.2. First screw; 4.2.1. Feeding section; 4.2.2. First solid conveying section; 4.2.3. First melt plasticizing section; 4.2.4. First melt conveying section; 4.2.5. First mixing section; 4.2.6. First vacuum exhaust section; 4.2.7. First discharging section; 4.3. Heating tube; 5. Second screw assembly; 5.1. Second screw; 5.1.1, feeding section; 5.1.2, second solid conveying section; 5.1.3, second melting and plasticizing section; 5.1.4, second melt conveying section; 5.1.5, natural exhaust section; 5.1.6, side feeding section; 5.1.7, third melting and plasticizing section; 5.1.8, third mixing section; 5.1.9, second vacuum exhaust section; 5.1.10, second discharging section; 6, conveyor belt; 7, air dryer; 8, pelletizer; 9, vibrating screen; 10, dryer; 11, silo. DETAILED DESCRIPTION

[0036] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0038] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0039] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0040] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0041] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0042] See also Figure 1-3 In this embodiment: a small-scale medical polyurethane production device includes a main body, the main body includes a main motor 3, a first screw assembly 4 controlled by the main motor 3, and a feeder 2 for injecting raw materials into the first screw assembly 4, the first screw assembly 4 includes a first screw barrel 4.1, and two mutually meshing first screws 4.2 arranged in the first screw barrel 4.1, the first screw 4.2 includes a feeding section 4.2.1, a first solid conveying section 4.2.2, a first melt plasticizing section 4.2.3, a first melt conveying section 4.2.4, a first mixing section 4.2.5, a first vacuum exhaust section 4.2.6, and a first discharge section 4.2.7 which are sequentially connected and integrally formed.

[0043] Through the setting of the feeding section 4.2.1, the first solid conveying section 4.2.2, the first melt plasticizing section 4.2.3, the first melt conveying section 4.2.4, the first mixing section 4.2.5, the first vacuum exhaust section 4.2.6, and the first discharging section 4.2.7, the structural design is reasonable, and the plasticizing and uniform mixing effects of the materials are optimized. Secondly, the first screw assembly 4 is composed of two mutually meshing first screws 4.2. The setting of the twin screws makes the preparation of the polyurethane longer, so that the chemical components are mixed more evenly and the chemical reaction is more fully reacted. The setting of the twin screws has good heat transfer, large melting capacity, strong exhaust capacity and good control of material temperature.

[0044] In some embodiments, Figure 1-Figure 3 As shown, the first solid conveying section 4.2.2 is provided with thread sections 48 / 24-2, 28 / 28, 24 / 24-2, 18 / 18-2 in sequence, the first melt plasticizing section 4.2.3 is provided with thread sections 30° / 7 / 28, 45° / 5 / 24, 16 / 16, 12 / 12 in sequence, the first melt conveying section 4.2.4 is provided with thread sections 45° / 5 / 24-2, 28 / 28, 24 / 24-2, 16 / 16 in sequence, the first mixing section 4.2.5 is provided with thread sections 45° / 5 / 24-2, 28 / 28, 24 / 24-2, 16 / 16 in sequence, There are thread sections 45° / 5 / 24, 60° / 16, 45° / 5 / 24, 24 / 24, 16 / 16. The first vacuum exhaust section 4.2.6 includes thread sections 45° / 5 / 24-2, 12 / 12, 18 / 28-2. The first discharging section 4.2.7 is provided with thread sections 24 / 24-3, 20 / 20, 18 / 18-2, 12 / 12-2 in sequence. It should be noted that this makes the structural design of the first screw assembly 4 more reasonable and the mixing effect better.

[0045] In some embodiments, Figure 4-Figure 6 As shown, the main body includes a second screw assembly 5, the second screw assembly 5 includes a second screw 5.1, and the second screw assembly 5 is a single screw arrangement. The raw material passes through the first screw assembly 4 and then enters the second screw assembly 5. It should be noted that when the material passes through the first screw assembly 4 and then passes through the second screw assembly 5 which is a single screw arrangement, the material is further matured, the reaction is more complete, and preparations are made for the next step.

[0046] In some embodiments, Figure 4-Figure 6As shown, the second screw 5.1 includes a feed inlet section 5.1.1, a second solid conveying section 5.1.2, a second melt plasticizing section 5.1.3, a second melt conveying section 5.1.4, a natural exhaust section 5.1.5, a side feeding section 5.1.6, a third melt plasticizing section 5.1.7, a third mixing section 5.1.8, a second vacuum exhaust section 5.1.9, and a second discharge section 5.1.10, which are sequentially connected and integrally formed. The feed inlet section 5.1.1 is sequentially provided with thread sections 32 / 32, 48 / 48, 48 / 48, 48 / 48, 32 / 32, 32 / 32, the second solid conveying section 5.1.2 is provided with thread sections 32 / 32, 22 / 22, 22 / 22, 22 / 22, 22 / 22, the second melt plasticizing section 5.1.3 is provided with thread sections 22 / 22, 30° / 7 / 48, 45° / 5 / 32, 45° / 5 / 32, 32 / 32, the second melt conveying section 5.1.4 is provided with thread sections 22 / 22, 45° / 5 / 32 , 60° / 4 / 22, 60° / 4 / 22, 22 / 11, 48 / 48, the natural exhaust section 5.1.5 includes thread sections 48 / 48, 48 / 48, 48 / 48, the side feeding section 5.1.6 is provided with thread sections 48 / 48, 48 / 48, 32 / 32 in sequence, the third melt plasticizing section 5.1.7 is provided with thread sections 22 / 22, 22 / 22, 22 / 22, 45° / 5 / 32, 60° / 4 / 22, 22 / 22, the third mixing section 5.1. 8 are provided with thread sections 22 / 22, 45° / 5 / 32, 60° / 4 / 22, 60° / 4 / 22, 90° / 5 / 32 in sequence, the second vacuum exhaust section 5.1.9 includes thread sections 22 / 11, 48 / 48, 48 / 48, and the second discharging section 5.1.10 includes thread sections 32 / 32, 22 / 22, 22 / 22, 22 / 22, 22 / 22. It should be noted that this makes the structural design of the second screw 5.1 component 5 more reasonable and the mixing effect better.

[0047] In some embodiments, Figure 7 As shown, the main body includes a conveyor belt 6 for transmission after being extruded by the second screw assembly 5. The conveyor belt 6 is made of tetrafluoroethylene material. It should be noted that tetrafluoroethylene material is non-sticky and has the smallest surface tension among solid materials without adhering to any substance, thereby avoiding adhesion of polyurethane to the conveyor belt.

[0048] In some embodiments, Figure 7 As shown, an air dryer 7 is provided on the conveyor belt 6 to air cool the raw material extruded through the second screw assembly 5. It should be noted that polyurethane will hydrolyze when cooled in water, and this situation can be avoided by air cooling.

[0049] In some embodiments, Figure 8-Figure 9As shown, a heating tube 4.3 is sleeved on the outer wall of the first screw assembly 4. It should be noted that the heating tube 4.3 heats and melts the material in the first screw assembly 4, so that the material reacts faster and the chemical reaction is more complete.

[0050] In some embodiments, Figure 10-Figure 14 As shown, the feeder 2 is a cone double feeder. It should be noted that it has good sealing performance without powder leakage, and has the advantages of continuous material conveying and automatic cleaning.

[0051] Working principle: Figure 1-Figure 14 As shown, the main body includes a crusher 1, a first screw assembly 4, a second screw assembly 5, a conveyor belt 6, an air dryer 7, a pelletizer 8, a vibrating screen 9, a dryer 10, and a silo 11. The steps of the preparation process of medical polyurethane are: S1: manually synthesizing the raw materials into plates; S2: crushing the plates through the crusher 1; S3: the crushed materials are further plasticized by the twin screws of the first screw assembly 4; S4: the plasticized materials are then extruded through the single screw machine of the second screw assembly 5; S5: the extruded materials of the single screw machine of the second screw assembly 5 are air-cooled through the air dryer 7 on the conveyor belt 6; S6: the extruded materials are pelletized by the pelletizer 8 after air cooling; S7: after pelletizing, they are sorted by the vibrating screen 9; S8: the sorted particles are sucked to the dryer 10 for drying by negative pressure, and the dried particles are sent to the silo 11.

[0052] Due to the small amount of research and development of medical polyurethane, manual synthesis of plates is adopted instead of using a filling machine; secondly, the plates are crushed by a crusher 1, the purpose of which is to allow the material to enter the first screw assembly 4 for reaction; thirdly, the first screw assembly 4 is a twin-screw structure arrangement combination and aspect ratio to allow the material to be fully mixed and evenly distributed in the twin screws; fourthly, the material extruded by the first screw assembly 4 is further matured by the single screw of the second screw assembly 5, the purpose of which is to allow the material to further fully react and prepare for granulation; fifthly, the material coming out of the single screw of the second screw assembly 5 is air-cooled; the purpose of this process is to avoid the hydrolysis of polyurethane caused by cooling the material in water in the past; sixthly, granulation is carried out after cooling; seventhly, the granulation is screened by a vibrating screen 9, the purpose of which is to ensure uniform particle size; eighthly, the granules are packaged into finished products after online drying.

[0053] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0054] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A small-scale medical polyurethane production device, comprising a body, characterized in that: The main body comprises a main motor (3), a first screw assembly (4) controlled to rotate by the main motor (3), and a feeder (2) for injecting raw materials into the first screw assembly (4); the first screw assembly (4) comprises a first screw barrel (4.1), and two first screws (4.2) meshing with each other arranged in the first screw barrel (4.1); the first screw (4.2) comprises a feeding section (4.2.1), a first solid conveying section (4.2.2), a first melt plasticizing section (4.2.3), a first melt conveying section (4.2.4), a first mixing section (4.2.5), a first vacuum exhaust section (4.2.6), and a first discharge section (4.2.7) which are connected in sequence and integrally formed.

2. A small-scale medical polyurethane production device according to claim 1, characterized in that: The first solid conveying section (4.2.2) is provided with thread sections 48 / 24-2, 28 / 28, 24 / 24-2, 18 / 18-2 in sequence, and the first melt plasticizing section (4.2.3) is provided with thread sections 30° / 7 / 28, 45° / 5 / 24, 16 / 16, 12 / 12, the first melt conveying section (4.2.4) is provided with thread sections 45° / 5 / 24-2, 28 / 28, 24 / 24-2, 16 / 16 in sequence, the first mixing section (4.2.5) is provided with thread sections 45° / 5 / 24, 60° / 16, 45° / 5 / 24, 24 / 24, 16 / 16 in sequence, the first vacuum exhaust section (4.2.6) includes thread sections 45° / 5 / 24-2, 12 / 12, 18 / 28-2, the first discharging section (4.2.7) is provided with thread sections 24 / 24-3, 20 / 20, 18 / 18-2, 12 / 12-2 in sequence.

3. A small-scale medical polyurethane production device according to claim 1, characterized in that: The main body comprises a second screw assembly (5), the second screw assembly (5) comprises a second screw (5.1), and the second screw assembly (5) is a single screw arrangement, and the raw material enters the second screw assembly (5) after passing through the first screw assembly (4).

4. A small-scale medical polyurethane production device according to claim 3, characterized in that: The second screw (5.1) includes an inlet section (5.1.1), a second solid conveying section (5.1.2), a second melt plasticizing section (5.1.3), a second melt conveying section (5.1.4), a natural exhaust section (5.1.5), a side feeding section (5.1.6), a third melt plasticizing section (5.1.7), a third mixing section (5.1.8), a second vacuum exhaust section (5.1.9), and a second discharge section (5.1.10) which are connected in sequence and formed as one piece.

5. A small-scale medical polyurethane production device according to claim 4, characterized in that: The feed inlet section (5.1.1) is provided with thread sections 32 / 32, 48 / 48, 48 / 48, 48 / 48, 32 / 32, 32 / 32 in sequence; the second solid conveying section (5.1.2) is provided with thread sections 32 / 32, 22 / 22, 22 / 22, 22 / 22, 22 / 22 in sequence; the second melt plasticizing section (5.1.3) is provided with thread sections 22 / 22, 30° / 7 / 48, 45° / 5 / 32, 45° / 5 / 32, 32 / 32 in sequence; the second melt conveying section (5.1.4) is provided with thread sections 22 / 22, 45° / 5 / 32, 60° / 4 / 22, 60° / 4 / 22, 22 / 11, 48 / 48 in sequence; the natural exhaust section (5.1.5) includes thread sections 48 / 48, 4 8 / 48, 48 / 48, the side feeding section (5.1.6) is provided with thread sections 48 / 48, 48 / 48, 32 / 32 in sequence, the third melt plasticizing section (5.1.7) is provided with thread sections 22 / 22, 22 / 22, 22 / 22, 45° / 5 / 32, 60° / 4 / 22, 22 / 22 in sequence, the third mixing section (5.1.8) is provided with thread sections 22 / 22, 45° / 5 / 32, 60° / 4 / 22, 60° / 4 / 22, 90° / 5 / 32 in sequence, the second vacuum exhaust section (5.1.9) includes thread sections 22 / 11, 48 / 48, 48 / 48, the second discharging section (5.1.10) includes thread sections 32 / 32, 22 / 22, 22 / 22, 22 / 22, 22 / 22.

6. A small-scale medical polyurethane production device according to claim 5, characterized in that: The main body comprises a conveyor belt (6) for transmission after being extruded by the second screw assembly (5), and the conveyor belt (6) is made of tetrafluoroethylene material.

7. A small-scale medical polyurethane production device according to claim 6, characterized in that: The conveyor belt (6) is provided with an air dryer (7) for air cooling the raw materials extruded through the second screw assembly (5).

8. A small-scale medical polyurethane production device according to claim 7, characterized in that: A heating tube (4.3) is sleeved on the outer wall of the first screw assembly (4).

9. A small-scale medical polyurethane production device according to claim 1, characterized in that: The feeder (2) is a cone double feeder.

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