Self-cleaning plastic screw extruder

Abstract

The utility model relates to the technical field of plastic processing, in particular to a self-cleaning plastic screw extruder, which comprises a screw extrusion barrel for producing plastic products, a forward and reverse rotation servo motor is mounted at one end of the screw extrusion barrel, and a feed hopper and a self-cleaning reverse blowing machine are mounted at the top of the screw extrusion barrel. According to the utility model, the self-cleaning blowback machine is arranged, and the air outlet connecting air pipe of the self-cleaning blowback machine is in interference insertion fit with the blowback air hole in the top of the screw extrusion barrel, so that during cleaning, the self-cleaning blowback machine can provide reverse airflow to the inside of the screw extrusion barrel, residual plastic on the inner wall of the screw extrusion barrel and a screw is effectively removed, and blockage is avoided; due to the design of the replaceable extrusion head at one end part of the screw extrusion barrel, a user can easily replace extrusion heads with different specifications or functions according to production requirements, and the flexibility and applicability of equipment are improved; in addition, a forward and reverse rotation servo motor is installed, so that the screw rod can work in a reverse rotation mode, and the self-cleaning effect of the equipment is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plastic processing, specifically is self -cleaning plastic screw extruder. BACKGROUND

[0002] In the field of plastic product production, screw extruder as the key equipment, undertakes the important task of plasticizing and extruding the plastic raw material into the shape. With the continuous development of plastic industry, the requirement of product quality, production efficiency and equipment maintenance is continuously improved. The traditional plastic screw extruder is easy to leave the plastic material in the barrel and screw in the long-term use process, not only affects the quality of subsequent products, but also increases the cleaning difficulty and downtime. The barrel and screw surface of the existing screw extruder is easy to adhere to the material due to the physical and chemical properties of the plastic material under high temperature and high pressure. Especially when producing different color, material plastic product switching, residual material will cause color mixing, product performance change and other quality problems. At present, it mainly depends on manual cleaning, needs to stop the machine and disassemble the parts, uses chemical solvent or special tool to scrape, the process is complex and time-consuming. Not only affects the production efficiency, but also may cause the parts to be worn out due to frequent disassembly, reduces the service life of the equipment. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing self -cleaning plastic screw extruder to solve the inconvenient cleaning problem of the existing plastic screw extruder in the above background technology.

[0004] In order to realize the above object, the utility model provides the following technical scheme:

[0005] Self -cleaning plastic screw extruder, including the screw extrusion cylinder for plastic product production, one end of the screw extrusion cylinder is equipped with forward and reverse servo motor, the top of the screw extrusion cylinder is equipped with feed hopper and self -cleaning back blowing machine;

[0006] The end of the screw extrusion cylinder away from the forward and reverse servo motor is equipped with replaceable extrusion head, the end of the screw extrusion cylinder close to the forward and reverse servo motor is equipped with reverse discharge port, the top of the outer wall of the screw extrusion cylinder is equipped with back blowing hole;

[0007] The air outlet of the self -cleaning back blowing machine is equipped with connecting air pipe, the connecting air pipe is matched with the size of the back blowing hole and the both are interference fit.

[0008] As preferred, the replaceable extrusion head is threadedly connected with the end of the screw extrusion cylinder.

[0009] As preferred, the inner wall of the screw extrusion cylinder is provided with PTFE coating with the thickness of 0.25-0.5mm.

[0010] As preferred, the reverse blow hole is threaded with a sealing plug, and the reverse discharge port is threaded with a fixed plug.

[0011] As preferred, the bottom of the screw extrusion barrel is provided with a support frame in H-shaped cross section.

[0012] As preferred, a screw pusher is installed in the screw extrusion barrel, and the central shaft of the screw pusher is connected to the output rotating shaft of the forward-reverse servo motor.

[0013] As preferred, a control valve is installed on the discharging pipe of the feeding hopper and the replaceable extrusion head.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] In the self-cleaning plastic screw extruder, the air outlet of the self-cleaning blow machine is connected to the reverse blow hole at the top of the screw extrusion barrel through interference fit, so that the self-cleaning blow machine can provide reverse air flow to the inside of the screw extrusion barrel during cleaning, effectively removing the residual plastic on the inner wall of the screw extrusion barrel and the screw, avoiding blockage; the replaceable extrusion head at one end of the screw extrusion barrel allows users to easily replace extrusion heads of different specifications or functions according to production needs, improving the flexibility and applicability of the equipment; in addition, the installation of the forward-reverse servo motor allows the screw to work in forward-reverse mode, further enhancing the self-cleaning effect of the equipment and facilitating the uniform mixing and extrusion of plastic; the reverse discharge port facilitates the quick discharge of residual materials in the screw extrusion barrel when needed, and together with the feeding hopper, ensures the smooth entry and exit of plastic raw materials, thereby improving the overall production efficiency and cleaning convenience of the plastic screw extruder.

[0016] In the self-cleaning plastic screw extruder, the replaceable extrusion head is threadedly connected to the end of the screw extrusion barrel, allowing the replaceable extrusion head to be easily detached and replaced from the end of the screw extrusion barrel without the need for complex tools or steps, thereby improving the maintenance efficiency and flexibility of the equipment.

[0017] In the self-cleaning plastic screw extruder, control valves are installed on the discharging pipe of the feeding hopper and the replaceable extrusion head, allowing the feeding hopper and the replaceable extrusion head to be in a sealed state during reverse cleaning. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification, together with the embodiments of the present application, to make a further detailed explanation, but do not constitute a limitation on the present application.

[0019] Fig. 1 The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification, together with the embodiments of the present application, to make a further detailed explanation, but do not constitute a limitation on the present application.

[0020] Fig. 2 This is a schematic diagram of the cross-sectional structure of the present invention during forward extrusion;

[0021] Fig. 3 This is a schematic diagram of the cross-sectional structure of the present invention during reverse cleaning;

[0022] 10. Screw extruder barrel; 11. Replaceable extruder head; 12. Reverse discharge port; 13. Sealing plug; 14. Backflush vent; 15. Fixing plug; 16. Support frame;

[0023] 20. Forward and reverse servo motors; 21. Screw feeder;

[0024] 30. Self-cleaning backflushing machine; 31. Connecting air duct;

[0025] 40. Feed hopper; 41. Control valve. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. 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.

[0027] In the description of this utility model, it should be understood that the terms "center", "vertical", "horizontal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this utility model and to simplify the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Self-cleaning plastic screw extruders, such as Figs. 1-3As shown, including a screw extrusion barrel 10 for plastic product production, one end of the screw extrusion barrel 10 is provided with a forward and reverse servo motor 20, the top of the screw extrusion barrel 10 is provided with a feeding hopper 40 and a self-cleaning back blowing machine 30; the end of the screw extrusion barrel 10 away from the forward and reverse servo motor 20 is provided with a replaceable extrusion head 11, the end of the screw extrusion barrel 10 close to the forward and reverse servo motor 20 is provided with a reverse discharge port 12, and the top of the outer wall of the screw extrusion barrel 10 is provided with a back blowing hole 14; the air outlet of the self-cleaning back blowing machine 30 is provided with a connecting air pipe 31, the connecting air pipe 31 is matched with the back blowing hole 14 in size and the two are interference fit, through the self-cleaning back blowing machine 30, the air outlet connecting air pipe 31 and the back blowing hole 14 on the top of the screw extrusion barrel 10 are interference fit, so that when cleaning, the self-cleaning back blowing machine 30 can provide reverse airflow to the inside of the screw extrusion barrel 10, effectively remove the residual plastic on the inner wall of the screw extrusion barrel 10 and the screw, and avoid blockage; the replaceable extrusion head 11 at one end of the screw extrusion barrel 10 is designed so that users can easily replace extrusion heads of different specifications or functions according to production needs, improving the flexibility and applicability of the equipment; in addition, the installation of the forward and reverse servo motor 20 enables the screw to work in forward and reverse mode, further enhancing the self-cleaning effect of the equipment and facilitating the uniform mixing and extrusion of plastic; the provision of the reverse discharge port 12 facilitates the quick discharge of residual materials in the screw extrusion barrel 10 when needed, and together with the feeding hopper 40, it ensures the smooth entry and exit of plastic raw materials, thereby improving the overall production efficiency and cleaning convenience of the plastic screw extruder.

[0029] It is worth noting that the replaceable extrusion head 11 is threadedly connected to the end of the screw extrusion barrel 10, so that the replaceable extrusion head 11 can be easily detached and replaced from the end of the screw extrusion barrel 10 without the need for complex tools or steps, thereby improving the maintenance efficiency and flexibility of the equipment.

[0030] Further, the inner wall of the screw extrusion barrel 10 is provided with a PTFE coating with a thickness of 0.25-0.5mm, which has low friction coefficient and anti-adhesion, reducing plastic residue.

[0031] Among them, the reverse discharge port 12 is threadedly connected with a sealing plug 13, and the back blowing hole 14 is threadedly connected with a fixed plug 15, respectively ensuring the sealing of the reverse discharge port 12 and the back blowing hole 14 when not in use, preventing material leakage, thereby ensuring the normal operation of the equipment and the stability of the extruded products.

[0032] Specifically, the bottom of the screw extrusion barrel 10 is provided with a support frame 16 with a cross-section in the shape of H, providing stable and firm support, so that the screw extrusion barrel 10 can remain stable during operation, reducing vibration and noise, and improving the stability and durability of the equipment.

[0033] In addition, the screw extrusion barrel 10 is provided with a screw pusher 21, and the central shaft of the screw pusher 21 is connected to the output rotating shaft of the forward and reverse servo motor 20, so that the stability is improved.

[0034] It is worth noting that the control valve 41 is arranged on the discharging pipe of the feeding hopper 40 and the replaceable extrusion head 11, so that the feeding hopper 40 and the replaceable extrusion head 11 are in a sealed state during reverse cleaning.

[0035] Working principle of the self-cleaning plastic screw extruder:

[0036] Firstly, the control valve 41 on the feeding hopper 40 is opened, and the plastic raw materials are poured in; then, the forward and reverse servo motor 20 is started to drive the screw pusher 21 to rotate in the screw extrusion barrel 10, so that the raw materials are pushed to the replaceable extrusion head 11; when the raw materials are pushed to the extrusion head 11, the control valve 41 on the extrusion head 11 is opened, and the plastic products are extruded from the extrusion head; according to the production requirements, the extrusion head 11 with different specifications or functions can be easily replaced;

[0037] If cleaning is needed, the control valve 41 is closed to make the feeding hopper 40 and the extrusion head 11 in a sealed state, the self-cleaning back blowing machine 30 is started, reverse air flow is provided to the back blowing air hole 14 through the connecting air pipe 31, and the residual plastic on the screw and the barrel wall is removed; if the residual materials need to be quickly discharged, the sealing plug 13 on the reverse discharging port 12 is opened to discharge the materials;

[0038] The basic principle, main features and advantages of the self-cleaning plastic screw extruder are shown and described above. It should be understood by those skilled in the art that the self-cleaning plastic screw extruder is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the self-cleaning plastic screw extruder and are not intended to limit the self-cleaning plastic screw extruder. Without departing from the spirit and scope of the self-cleaning plastic screw extruder, various changes and improvements can be made to the self-cleaning plastic screw extruder, and these changes and improvements all fall within the scope of the self-cleaning plastic screw extruder. The scope of protection of the self-cleaning plastic screw extruder is defined by the appended claims and their equivalents.

Claims

1. A self-cleaning plastic screw extruder comprising a screw extruder barrel (10) for plastic product production, characterized in that: One end of the screw extrusion barrel (10) is provided with a forward and reverse servo motor (20), and a top of the screw extrusion barrel (10) is provided with a feeding hopper (40) and a self-cleaning back blowing machine (30); A replaceable extrusion head (11) is arranged at an end of the screw extrusion barrel (10) away from the forward and reverse servo motor (20), a reverse discharging port (12) is arranged at an end of the screw extrusion barrel (10) close to the forward and reverse servo motor (20), and a back blowing air hole (14) is arranged at a top of an outer wall of the screw extrusion barrel (10). An air outlet of the self-cleaning back blowing machine (30) is provided with a connecting air pipe (31), the connecting air pipe (31) is matched with the back blowing air hole (14) in size and is connected to the back blowing air hole (14) in an interference fit.

2. The self-cleanable plastic screw extruder of claim 1, wherein: The replaceable extrusion head (11) is threadedly connected to the end of the screw extrusion barrel (10).

3. The self-cleanable plastic screw extruder of claim 1, wherein: A PTFE coating with a thickness of 0.25-0.5 mm is arranged on an inner wall of the screw extrusion barrel (10).

4. The self-cleanable plastic screw extruder of claim 1, wherein: The reverse discharging port (12) is threadedly connected with a sealing plug (13), and the back blowing air hole (14) is threadedly connected with a fixing plug (15).

5. The self-cleanable plastic screw extruder of claim 1, wherein: A support frame (16) with an H-shaped cross section is arranged at a bottom of the screw extrusion barrel (10).

6. The self-cleanable plastic screw extruder of claim 1, wherein: A screw pushing device (21) is arranged in the screw extrusion barrel (10), and a central shaft of the screw pushing device (21) is connected to an output rotating shaft of the forward and reverse servo motor (20).

7. The self-cleanable plastic screw extruder of claim 1, wherein: Control valves (41) are arranged on a discharging pipe of the feeding hopper (40) and the replaceable extrusion head (11).

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