Single-spiral exhaust extruder for producing medical PET (Polyethylene Terephthalate) sheets

Abstract

The utility model discloses a single spiral exhaust extruder for producing medical PET (polyethylene terephthalate) sheets, which comprises a support box, a screw barrel is fixedly connected to the axis part of the front end of the support box, a feed hopper is mounted at the feed end of the screw barrel, a driving shaft is mounted at the axis part of the rear end of the support box, one end of the driving shaft penetrates through the rear end of the support box, and the other end of the driving shaft penetrates through the support box. And a third screw section is fixedly connected. According to the single-spiral exhaust extruder for producing the medical PET sheets, after plastic passes through the perforated inner pipe, gas can be guided into the communicating pipe through the through holes formed in the outer wall of the perforated inner pipe and then is transmitted to the communicated exhaust holes through the communicating pipe to be exhausted, and the situation that the through holes formed in the outer wall of the perforated inner pipe are blocked by the plastic is avoided; due to the fact that the perforated inner pipe can extrude the perforated holes in the plastic conveying process, the plastic blocking the perforated holes can be broken through.

Description

Technical Field

[0001] This utility model relates to the field of exhaust extruders, specifically a single-screw exhaust extruder for the production of medical PET sheets. Background Technology

[0002] In the medical field, polymer materials are widely used due to their excellent properties. Among them, polyethylene terephthalate (PET) sheets occupy an important position in medical packaging and medical device components due to their good mechanical properties, chemical stability, transparency, and biocompatibility. With the continuous development of medical technology, higher requirements are being placed on the quality and production efficiency of medical PET sheets.

[0003] Traditional PET sheet extrusion equipment has some limitations in the production process. First, PET raw materials easily absorb moisture during processing. The presence of moisture can cause problems such as air bubbles and degradation during extrusion, thus affecting the performance and appearance quality of the sheets. Utility Model Content

[0004] The purpose of this invention is to provide a single-screw exhaust extruder for the production of medical PET sheets, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A single-screw vented extruder for producing medical PET sheets includes a support box. A screw barrel is fixedly connected to the front shaft of the support box, and a feed hopper is installed at the feed end of the screw barrel. A drive shaft is installed at the rear shaft of the support box. One end of the drive shaft passes through the rear end of the support box and is fixedly connected to a third screw section. A second screw section is fixedly connected to the end of the third screw section away from the drive shaft. A first screw section is installed at the end of the second screw section away from the third screw section. A venting disc assembly is provided between the first screw section and the second screw section.

[0007] As a further embodiment of this utility model: a fixing plate is installed at the end of the screw cylinder away from the support box, and guide posts are fixedly connected to all four sides of the end of the fixing plate away from the screw cylinder, and a movable plate is slidably connected to the outer wall of the guide posts.

[0008] As a further embodiment of this utility model: a front plate is provided at the end of the movable plate away from the fixed plate one, the front plate is slidably connected to the outer wall of the guide post, and a fixed plate two is fixedly connected to the top of the guide post.

[0009] As a further embodiment of this utility model: a push rod is installed at the top center of the second fixed plate, the bottom of the push rod penetrates through the top of the second fixed plate and is fixedly connected to the surface of the front plate, and a cylinder is installed at the pushing end of the push rod.

[0010] As a further embodiment of this utility model: the exhaust disc assembly includes a mounting disc, an inner bushing is mounted at the center of the mounting disc, an open inner tube is mounted at the axial center of the inner bushing, and a connecting tube is fixedly connected to the perforated part, and bolt holes are provided around the upper surface of the inner bushing.

[0011] As a further embodiment of this utility model: a connecting pipe is installed on the outer wall of the inner tube with opening, and a row hole is opened on the outer wall of the mounting plate, and the connecting pipe is connected to the row hole.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] In this invention, an exhaust plate assembly is installed between the first and second sections of the screw. After the plastic passes through the perforated inner tube, the gas is introduced into the connecting pipe through the perforation on the outer wall of the perforated inner tube. The gas is then discharged through the connecting pipe to the connected exhaust hole. There is no situation where the plastic blocks the perforation on the outer wall of the perforated inner tube because the perforated inner tube will be squeezed and perforated during the plastic transport. Even if the plastic is blocked at the perforation, it will be broken through. Its structure is more optimized and its design is more reasonable. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a single-screw exhaust extruder for producing medical PET sheets.

[0015] Figure 2 This is a cross-sectional view of a single-screw exhaust extruder for producing medical PET sheets.

[0016] Figure 3 This is a structural diagram of the exhaust disc assembly in a single-screw exhaust extruder for the production of medical PET sheets.

[0017] Figure 4 This is an assembly drawing of the exhaust disc assembly in a single-screw exhaust extruder for the production of medical PET sheets.

[0018] In the diagram: 1. Support box; 2. Feed hopper; 3. Drive shaft; 4. Screw barrel; 5. Fixed plate 1; 6. Movable plate; 7. Material trough; 8. Guide column; 9. Cylinder; 10. Fixed plate 2; 11. Front plate; 12. Exhaust disc assembly; 13. Screw section 1; 14. Screw section 2; 15. Screw section 3; 16. Mounting disc; 17. Drain hole; 18. Inner bushing; 19. Bolt hole; 20. Opening inner tube; 21. Connecting pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1-4 In this embodiment of the present invention, a single-screw exhaust extruder for producing medical PET sheets includes a support box 1. A screw barrel 4 is fixedly connected to the front shaft of the support box 1. A feed hopper 2 is installed at the feed end of the screw barrel 4. A drive shaft 3 is installed at the rear shaft of the support box 1. One end of the drive shaft 3 passes through the rear end of the support box 1 and is fixedly connected to a screw section 15. A screw section 2 14 is fixedly connected to the end of the screw section 3 15 away from the drive shaft 3. A screw section 13 is installed at the end of the screw section 2 14 away from the screw section 3 15. An exhaust disc assembly 12 is provided between the screw section 13 and the screw section 2 14.

[0021] A fixing plate 5 is installed at the end of the screw cylinder 4 away from the support box 1. Guide posts 8 are fixedly connected to all four sides of the fixing plate 5 away from the screw cylinder 4. A movable plate 6 is slidably connected to the outer wall of the guide post 8.

[0022] A front plate 11 is provided at the end of the movable plate 6 away from the fixed plate 5. The front plate 11 is slidably connected to the outer wall of the guide post 8. A fixed plate 10 is fixedly connected to the top of the guide post 8.

[0023] A push rod is installed at the top center of the fixed plate 2 10. The bottom of the push rod passes through the top of the fixed plate 2 10 and is fixedly connected to the surface of the front plate 11. A cylinder 9 is installed at the pushing end of the push rod.

[0024] The exhaust disc assembly 12 includes a mounting plate 16. An inner bushing 18 is installed at the center of the mounting plate 16. An inner tube 20 with an opening is installed at the axial part of the inner bushing 18, and a connecting tube 21 is fixedly connected to the perforated part. Bolt holes 19 are opened around the upper surface of the inner bushing 18.

[0025] A connecting pipe 21 is installed on the outer wall of the inner tube 20 with openings, and a drain hole 17 is opened on the outer wall of the mounting plate 16. The connecting pipe 21 is connected to the drain hole 17.

[0026] The working principle of this utility model is as follows:

[0027] In use, plastic is added through the feed hopper 2, and the drive shaft 3 is controlled to operate, driving the rotation of the screw section 15, screw section 14 and screw section 13 in the screw barrel 4, so as to push the plastic introduced into the feed hopper 2 through the inner cavity of the screw barrel 4 to the material trough 7. The cylinder 9 is controlled to operate, pushing the front plate 11 and the movable plate 6 to slide on the outer wall of the guide post 8. When the movable plate 6 contacts the material trough 7 opened on the fixed plate 5, the two merge, and the plastic in the material trough 7 is extruded to form a sheet.

[0028] An exhaust plate assembly 12 is installed between the first section 13 and the second section 14 of the screw. After the plastic passes through the perforated inner tube 20, the gas will be introduced into the connecting tube 21 through the perforation on the outer wall of the perforated inner tube 20. The gas will then be discharged through the connecting tube 21 to the connected exhaust hole 17. The plastic will not block the perforation on the outer wall of the perforated inner tube 20 because the perforated inner tube 20 will be squeezed and perforated during the transfer of plastic. Even if the plastic is blocked at the perforation, it will be broken through.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A single-screw exhaust extruder for producing medical PET sheets, comprising a support box (1), characterized in that: A screw cylinder (4) is fixedly connected to the front shaft of the support box (1). A feed hopper (2) is installed at the feed end of the screw cylinder (4). A drive shaft (3) is installed at the rear shaft of the support box (1). One end of the drive shaft (3) passes through the rear end of the support box (1) and is fixedly connected to a screw section (15). A screw section (14) is fixedly connected to the end of the screw section (15) away from the drive shaft (3). A screw section (13) is installed at the end of the screw section (14) away from the screw section (15). An exhaust plate assembly (12) is provided between the screw section (13) and the screw section (14).

2. The single-screw exhaust extruder for producing medical PET sheets according to claim 1, characterized in that: A fixing plate (5) is installed at the end of the screw cylinder (4) away from the support box (1). Guide posts (8) are fixedly connected to the four sides of the fixing plate (5) away from the screw cylinder (4). A movable plate (6) is slidably connected to the outer wall of the guide post (8).

3. The single-screw exhaust extruder for producing medical PET sheets according to claim 2, characterized in that: The movable plate (6) is provided with a front plate (11) at the end away from the fixed plate (5). The front plate (11) is slidably connected to the outer wall of the guide post (8). The top of the guide post (8) is fixedly connected to the fixed plate (10).

4. A single-screw exhaust extruder for producing medical PET sheets according to claim 3, characterized in that: A push rod is installed at the top center of the second fixed plate (10). The bottom of the push rod passes through the top of the second fixed plate (10) and is fixedly connected to the surface of the front plate (11). A cylinder (9) is installed at the pushing end of the push rod.

5. A single-screw exhaust extruder for producing medical PET sheets according to claim 1, characterized in that: The exhaust disc assembly (12) includes a mounting disc (16), an inner bushing (18) is mounted at the center of the mounting disc (16), an inner tube (20) with an opening is fixedly connected to the axial part of the inner bushing (18), and a connecting tube (21) is fixedly connected to the perforated part. Bolt holes (19) are provided around the upper surface of the inner bushing (18).

6. A single-screw exhaust extruder for producing medical PET sheets according to claim 5, characterized in that: The outer wall of the perforated inner tube (20) is equipped with a connecting pipe (21), and the outer wall of the mounting plate (16) is provided with a drain hole (17). The connecting pipe (21) is connected to the drain hole (17).

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