Melt ventilation structure of charging barrel

Abstract

The utility model discloses a charging barrel melt ventilation structure which comprises a first charging barrel assembly, a first flow channel used for transporting melt is arranged in the first charging barrel assembly, the first charging barrel assembly is provided with a first exhaust channel communicated with the first flow channel and the outside, a first ventilation piece is connected in the first exhaust channel, and a second ventilation piece is connected in the first ventilation piece. The first breathable piece is made of breathable materials. According to the utility model, the first ventilation piece is arranged, so that in the process of transporting the melt by the first flow channel, the gas in the melt can automatically flow out and be exhausted due to the existence of pressure difference and good gas flowability by utilizing the pressure of the melt, thereby achieving the function of automatic exhaust and ensuring the quality of a product; compared with the prior art, the whole structure is simple and compact, automatic exhaust is achieved, meanwhile, the advantage of low cost is achieved, and the application prospect is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a barrel melt air permeability structure. Background Art

[0002] The plastic used in the injection molding process is melted into a liquid state under high temperature and high pressure. Therefore, when the plastic is injected into the mold, the gas will be compressed and gathered in certain cavities of the mold. When the plastic further fills the mold, these gases will be sealed in the plastic. When the plastic cools, these gases will be trapped in the plastic to form bubbles, which will affect the quality of the product. Therefore, exhaust is an essential step in the injection molding process.

[0003] At present, the exhaust of the barrel mainly relies on the exhaust hole connected to the outside world, and a corresponding manual exhaust valve is arranged inside the exhaust hole, which needs to be exhausted manually, which is inconvenient to use during daily maintenance. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the utility model is to provide a barrel melt breathable structure, which has a first exhaust channel on the first barrel component, and a first breathable part made of breathable material is arranged therein, and in the process of transporting the melt, the first flow channel inside the utility model utilizes the melt pressure to automatically flow out and exhaust the gas in the melt due to the pressure difference and good gas fluidity, thereby achieving the function of automatic exhaust to ensure the quality of the product; compared with the prior art, the overall structure is simple and compact, and while realizing automatic exhaust, it has the advantage of low cost and broad application prospects.

[0006] (II) Technical solution

[0007] The solution adopted by the utility model to solve the above-mentioned technical problems is a barrel melt permeable structure, comprising a first barrel assembly and a second barrel assembly that cooperate with each other, the front end of the first barrel assembly is connected through a connecting barrel assembly; a first flow channel is arranged in the first barrel assembly, a second flow channel is arranged in the second barrel assembly, a connecting flow channel is arranged in the connecting barrel assembly, and the connecting flow channel is communicated with the first flow channel and the second flow channel respectively to connect the first flow channel and the second flow channel; wherein, the first barrel assembly is provided with a first exhaust channel connecting the first flow channel and the outside, a first air permeable part is connected in the first exhaust channel, and the first air permeable part is made of air permeable material; and the setting of the connecting barrel assembly can connect the first barrel assembly and the second barrel assembly to realize the transportation of the melt.

[0008] In some embodiments, a vacuum system may be installed outside the first air permeable member to improve the exhaust effect.

[0009] By adopting the above scheme, a first exhaust channel is opened on the first barrel assembly, in which a first air-permeable part made of air-permeable material is arranged. In the process of transporting the melt, the first flow channel inside the first flow channel utilizes the melt pressure to automatically flow out and exhaust the gas in the melt due to the pressure difference and good gas fluidity, thereby achieving the function of automatic exhaust to ensure the quality of the product. Compared with the existing technology, the overall structure is simple and compact, and while realizing automatic exhaust, it has the advantage of low cost and broad application prospects.

[0010] In some embodiments, a feeding channel connecting the first flow channel and the outside is opened at the tail end of the first barrel assembly, a connecting end connected to the connecting barrel assembly is provided at the front end of the first barrel assembly, and the first exhaust channel is arranged between the feeding channel and the connecting end.

[0011] By adopting the above scheme, after the raw material enters the first flow channel from the feeding channel, the gas therein can be discharged to the outside through the first breathable member during the process of being transported to the connecting flow channel, thereby improving the quality of the finished product.

[0012] In some embodiments, the connecting barrel assembly is provided with a second exhaust channel connected to the connecting flow channel and the outside, and a second air permeable member is connected to the second exhaust channel, and the second air permeable member is made of air permeable material.

[0013] By adopting the above scheme, during the process of transporting the melt from the first flow channel to the connecting flow channel and then to the second flow channel, the gas therein can be discharged to the outside through the second air permeable member. The double exhaust makes the quality of the finished product better.

[0014] In some embodiments, the connecting barrel assembly is connected to the middle of the second barrel assembly; the second flow channel is located at both ends of the connection between the second barrel assembly and the connecting barrel assembly, and a vacuum chamber and a feeding chamber are formed respectively; and the second barrel assembly is located at one end of the vacuum chamber away from the feeding chamber, and a third exhaust channel connecting the vacuum chamber and the outside is opened; the third exhaust channel is connected to a vacuum pumping mechanism.

[0015] Specifically, when molten plastic is heated, gases such as impurities, water vapor and volatile molecules will be generated. If they are not removed in time, bubbles will easily be generated during the injection process, thereby affecting the molding quality and even causing defective products. In addition, air and moisture often remain in the mold. The setting of the vacuum mechanism can effectively extract the gas, moisture, etc. in the second flow channel, effectively prevent the generation of bubbles, and improve the molding quality while also improving production efficiency. At the same time, the use of the vacuum mechanism can also extend the life of the mold, because the exhausted gas contains acidic substances, which will corrode the mold if not removed in time. In addition, the use of the vacuum mechanism can also reduce the melt temperature, thereby achieving the effect of energy saving and emission reduction.

[0016] In some embodiments, the connecting barrel assembly is vertically connected between the first barrel assembly and the second barrel assembly; this can improve the smoothness of the melt being transported from the first flow channel to the second flow channel, thereby improving production efficiency.

[0017] In some embodiments, the first barrel assembly includes a first barrel arranged horizontally, the first barrel is provided with the first flow channel along its axial direction, a first feeding screw is provided in the first flow channel, and the first feeding screw can rotate around its own central axis to transport the raw material toward its front end;

[0018] The second barrel assembly comprises a second barrel arranged horizontally, the second barrel being provided with the second flow channel along its axial direction; the second flow channel being provided with a second feeding screw; the second feeding screw being capable of rotating around its own central axis.

[0019] In some embodiments, one end of the first feeding screw along its axial direction can extend out of the tail end of the first barrel; and one end of the first feeding screw extending out of the first barrel is connected to a first driving mechanism, and the first driving mechanism can drive the first feeding screw to rotate around its own central axis;

[0020] One end of the second feeding screw along its axial direction can extend out of the tail end of the second barrel, and the end of the second feeding screw extending out of the second barrel is connected to a second driving mechanism, and the second driving mechanism can drive the second feeding screw to rotate around its own central axis.

[0021] In some embodiments, an injection port connected to the second flow channel is formed at the front end of the second barrel, and the second feeding screw can inject melt into the mold clamping device through the injection port.

[0022] In some embodiments, the connecting barrel assembly includes a connecting barrel, and the connecting barrel is provided with the connecting flow channel along its axial direction; the connecting flow channel is provided with a connecting feeding screw, and the connecting feeding screw can rotate around its own central axis; and the connecting feeding screw is vertically arranged relative to the first feeding screw and the second feeding screw.

[0023] In some embodiments, the connecting feeding screw is connected to the first barrel at one end along its axial direction, and the other end is a free end; and the connecting feeding screw can extend out of the first barrel, and the end of the connecting feeding screw extending out of the first barrel is connected to a third driving mechanism, and the third driving mechanism can drive the connecting feeding screw to rotate around its own central axis.

[0024] By adopting the above scheme, the setting of the connecting feeding screw can make the feeding process smoother during the rotation of the connecting feeding screw around its own central axis, which can effectively solve the problem of carbonization blockage after the raw material pauses and ensure work efficiency.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the utility model designs a barrel melt ventilation structure.

[0027] (1) The utility model is provided with a first exhaust channel on the first barrel assembly, in which a first air-permeable member made of air-permeable material is arranged. In the process of transporting the melt, the first flow channel inside the first flow channel utilizes the melt pressure to automatically exhaust the gas in the melt due to the pressure difference and good gas fluidity, thereby achieving the function of automatic exhaust to ensure the quality of the product; compared with the prior art, the overall structure is simple and compact, and while achieving automatic exhaust, it has the advantage of low cost and broad application prospects;

[0028] (2) The utility model provides a second exhaust channel in the connecting barrel assembly to connect the connecting flow channel and the outside world. The second exhaust channel is connected to a second air permeable member. The melt in the connecting flow channel through the first flow channel can be exhausted to the outside world through the second air permeable member during the process of being transported to the second flow channel. The double exhaust makes the quality of the finished product better.

[0029] (3) The utility model provides a vacuum mechanism at the tail end of the second barrel assembly, which can effectively extract the gas, moisture, etc. in the second flow channel, effectively prevent the generation of bubbles, and improve the molding quality while also improving the production efficiency; at the same time, the use of the vacuum mechanism can also extend the life of the mold, because the exhausted gas contains acidic substances, which will corrode the mold if not removed in time; in addition, the use of the vacuum mechanism can also reduce the melt temperature, thereby achieving the effect of energy saving and emission reduction;

[0030] (4) The utility model connects the feeding screw to make the feeding process smoother during the rotation of the feeding screw around its own central axis, thereby effectively solving the problem of carbonization blockage after the raw materials pause, thereby ensuring work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 It is a structural schematic diagram of the barrel melt ventilation structure of the utility model;

[0033] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0034] Figure 3 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0035] Figure 4 This is a schematic structural diagram of the barrel melt ventilation structure of the utility model from another angle;

[0036] Figure 5 for Figure 4 Sectional view at CC;

[0037] Figure 6 for Figure 5 The enlarged schematic diagram at E in the middle;

[0038] Figure 7 for Figure 5 The enlarged schematic diagram at F in the middle;

[0039] Figure 8 for Figure 5 The enlarged schematic diagram at G in the middle;

[0040] Fig. 9 for Figure 4 Sectional view at DD in the middle;

[0041] Fig.10 for Fig. 9 The enlarged schematic diagram at H in the middle;

[0042] Fig.11 for Fig. 9 The enlarged schematic diagram at I in the middle;

[0043] Fig.12It is a structural schematic diagram of the barrel melt permeable structure of the utility model (excluding the first permeable member and the second permeable member).

[0044] The names of the components corresponding to the various figure marks in the figure are: 100, first barrel assembly; 101, first flow channel; 102, first exhaust channel; 103, first air permeable member; 104, feeding channel; 105, connecting end; 106, first barrel; 107, first feeding screw; 200, second barrel assembly; 201, second flow channel; 201a, vacuum chamber; 201b, feeding chamber; 202, third exhaust channel; 203, second barrel; 204, second feeding screw; 205, injection port; 300, connecting barrel assembly; 301, connecting flow channel; 302, second exhaust channel; 303, second air permeable member; 304, connecting barrel; 305, connecting feeding screw; 305a, free end; 400, first driving mechanism. DETAILED DESCRIPTION

[0045] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0046] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0052] like Figure 1-Figure 12As shown, the utility model provides a barrel melt permeability structure, including a first barrel component 100 and a second barrel component 200 that cooperate with each other, the front end of the first barrel component 100 is connected to a barrel component 300; a first flow channel 101 is arranged in the first barrel component 100, and a second flow channel 201 is arranged in the second barrel component 200, and a connecting flow channel 301 is arranged in the connecting barrel component 300, and the connecting flow channel 301 is communicated with the first flow channel 101 and the second flow channel 201 respectively to connect the first flow channel 101 and the second flow channel 201; wherein, the first barrel component 100 is provided with a first exhaust channel 102 that connects the first flow channel 101 and the outside, and a first air permeable member 103 is connected in the first exhaust channel 102, and the first air permeable member 103 is made of air permeable material; and the setting of the connecting barrel component 300 can connect the first barrel component 100 and the second barrel component 200 to realize the transportation of the melt. According to the above scheme, a first exhaust channel 102 is provided on the first barrel assembly 100, in which a first air-permeable member 103 made of air-permeable material is provided. In the process of transporting the melt, the first flow channel 101 inside the first flow channel 102 utilizes the melt pressure to exhaust the gas in the melt automatically due to the pressure difference and good gas fluidity, thereby achieving the function of automatic exhaust to ensure the quality of the product. Compared with the prior art, the overall structure is simple and compact, and while achieving automatic exhaust, it has the advantages of low cost and broad application prospects. In some embodiments, a feeding channel 104 is provided at the tail end of the first barrel assembly 100 to connect the first flow channel 101 with the outside world, and a connecting end 105 connected to the connecting barrel assembly 300 is provided at the front end of the first barrel assembly 100, and the first exhaust channel 102 is provided between the feeding channel 104 and the connecting end 105. By adopting the above scheme, after the raw material enters the first flow channel 101 through the feeding channel 104, during the process of being transported to the connecting flow channel 301, the gas therein can be discharged to the outside through the first breathable member 103, thereby improving the quality of the finished product.

[0053] In some embodiments, the connecting barrel assembly 300 is provided with a second exhaust channel 302 that connects the connecting flow channel 301 and the outside, and a second air permeable member 303 is connected to the second exhaust channel 302, and the second air permeable member 303 is made of air permeable material. With the above solution, the melt in the connecting flow channel 301 through the first flow channel 101 can be discharged to the outside through the second air permeable member 303 during the process of being transported to the second flow channel 201. Through two exhausts, the quality of the finished product is better. In some embodiments, the connecting barrel assembly 300 is connected to the middle of the second barrel assembly 200; the second flow channel 201 is located at the two ends of the connection between the second barrel assembly 200 and the connecting barrel assembly 300, and a vacuum chamber 201a and a feeding chamber 201b are formed respectively; and, the second barrel assembly 200 is located at one end of the vacuum chamber 201a away from the feeding chamber 201b, and a third exhaust channel 202 connecting the vacuum chamber 201a and the outside is opened; the third exhaust channel 202 is connected to a vacuum pumping mechanism (not shown in the figure). Specifically, when heating the molten plastic, gases such as impurities, water vapor and volatile molecules will be generated. If they are not removed in time, bubbles will easily be generated during the injection process, thereby affecting the molding quality and even causing defective products. In addition, air and moisture often remain in the mold. The setting of the vacuum mechanism can effectively extract the gas, moisture, etc. in the second flow channel 201, effectively prevent the generation of bubbles, and improve the molding quality while also improving production efficiency. At the same time, the use of the vacuum mechanism can also extend the life of the mold, because the exhausted gas contains acidic substances, which will corrode the mold if not removed in time. In addition, the use of the vacuum mechanism can also reduce the melt temperature, thereby achieving the effect of energy saving and emission reduction. In some embodiments, the connecting barrel assembly 300 is vertically connected between the first barrel assembly 100 and the second barrel assembly 200; it can improve the smoothness of the melt from the first flow channel 101 to the second flow channel 201, thereby improving production efficiency.

[0054] In some embodiments, the first barrel assembly 100 includes a horizontally arranged first barrel 106, the first barrel 106 is provided with the first flow channel 101 along its axial direction, a first feeding screw 107 is provided in the first flow channel 101, and the first feeding screw 107 can rotate around its own central axis to transport the raw material toward its front end; the second barrel assembly 200 includes a horizontally arranged second barrel 203, the second barrel 203 is provided with the second flow channel 201 along its axial direction; the second flow channel 201 is provided with a second feeding screw 204; the second feeding screw 204 can rotate around its own central axis. In some embodiments, one end of the first feeding screw 107 along its axial direction can extend out of the tail end of the first barrel 106; and the end of the first feeding screw 107 extending out of the first barrel 106 is connected to a first driving mechanism 400, and the first driving mechanism 400 can drive the first feeding screw 107 to rotate around its own central axis; one end of the second feeding screw 204 along its axial direction can extend out of the tail end of the second barrel 203, and the end of the second feeding screw 204 extending out of the second barrel 203 is connected to a second driving mechanism (not shown in the figure), and the second driving mechanism can drive the second feeding screw 204 to rotate around its own central axis. In some embodiments, the front end of the second barrel 203 is provided with an injection port 205 connected to the second runner 201, and the second feeding screw 204 can inject melt into the clamping device through the injection port 205. In some embodiments, the connecting barrel assembly 300 includes a connecting barrel 304, and the connecting barrel 304 is provided with the connecting flow channel 301 along its axial direction; the connecting flow channel 301 is provided with a connecting feeding screw 305, and the connecting feeding screw 305 can rotate around its own central axis; and the connecting feeding screw 305 is vertically arranged relative to the first feeding screw 107 and the second feeding screw 204. In some embodiments, one end of the connecting feeding screw 305 along its axial direction is connected to the first barrel 106, and the other end is a free end 305a; and the connecting feeding screw 305 can extend out of the first barrel 106, and one end of the connecting feeding screw 305 extending out of the first barrel 106 is connected to a third driving mechanism (not shown in the figure), and the third driving mechanism can drive the connecting feeding screw 305 to rotate around its own central axis. By adopting the above scheme, the setting of the connecting feeding screw 305 can make the feeding process smoother during the rotation of the screw around its own central axis, which can effectively solve the problem of carbonization blockage after the raw material pauses and ensure work efficiency.

[0055] 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.

[0056] 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. Barrel melt permeable structure, characterized by: The invention comprises a first barrel assembly (100), wherein a first flow channel (101) for transporting a melt is arranged in the first barrel assembly (100), wherein the first barrel assembly (100) is provided with a first exhaust channel (102) connecting the first flow channel (101) and the outside, wherein a first air permeable member (103) is connected in the first exhaust channel (102), and the first air permeable member (103) is made of an air permeable material.

2. The barrel melt venting structure according to claim 1, characterized in that: The invention also comprises a second barrel assembly (200) which cooperates with the first barrel assembly (100); the front end of the first barrel assembly (100) is connected to the second barrel assembly (200) via a connecting barrel assembly (300); a second flow channel (201) is arranged in the second barrel assembly (200); a connecting flow channel (301) is arranged in the connecting barrel assembly (300); the connecting flow channel (301) is connected to the first flow channel (101) and the second flow channel respectively. (201) are connected to each other so as to connect the first flow channel (101) and the second flow channel (201); the tail end of the first barrel assembly (100) is provided with a feeding channel (104) connecting the first flow channel (101) and the outside, the front end of the first barrel assembly (100) is provided with a connecting end (105) connected to the connecting barrel assembly (300), and the first exhaust channel (102) is provided between the feeding channel (104) and the connecting end (105).

3. The barrel melt venting structure according to claim 2, characterized in that: The connecting barrel assembly (300) is provided with a second exhaust channel (302) which is in communication with the connecting flow channel (301) and the outside. A second air permeable member (303) is connected to the inside of the second exhaust channel (302). The second air permeable member (303) is made of an air permeable material.

4. The barrel melt venting structure according to claim 2, characterized in that: The connecting barrel assembly (300) is connected to the middle of the second barrel assembly (200); the second flow channel (201) is located at both ends of the connection between the second barrel assembly (200) and the connecting barrel assembly (300), and a vacuum chamber (201a) and a feeding chamber (201b) are formed respectively; and the second barrel assembly (200) is located at one end of the vacuum chamber (201a) away from the feeding chamber (201b) and is provided with a third exhaust channel (202) connecting the vacuum chamber (201a) and the outside; the third exhaust channel (202) is connected to a vacuum pumping mechanism.

5. The barrel melt venting structure according to claim 2, characterized in that: The connecting cartridge assembly (300) is vertically connected between the first cartridge assembly (100) and the second cartridge assembly (200).

6. The barrel melt venting structure according to claim 2, characterized in that: The first barrel assembly (100) comprises a first barrel (106) arranged horizontally, the first barrel (106) being provided with the first flow channel (101) along its axial direction, a first feeding screw (107) being arranged in the first flow channel (101), and the first feeding screw (107) being capable of rotating around its own central axis; The second barrel assembly (200) comprises a second barrel (203) arranged horizontally, wherein the second barrel (203) is provided with the second flow channel (201) along its axial direction; the second flow channel (201) is provided with a second feeding screw (204); the second feeding screw (204) is capable of rotating around its own central axis.

7. The barrel melt venting structure according to claim 6, characterized in that: One end of the first feeding screw (107) along its axial direction can extend out of the tail end of the first barrel (106); and one end of the first feeding screw (107) extending out of the first barrel (106) is connected to a first driving mechanism (400), and the first driving mechanism (400) can drive the first feeding screw (107) to rotate around its own central axis; One end of the second feeding screw (204) along its axial direction can extend out of the tail end of the second barrel (203), and the end of the second feeding screw (204) extending out of the second barrel (203) is connected to a second driving mechanism, and the second driving mechanism can drive the second feeding screw (204) to rotate around its own central axis.

8. The barrel melt venting structure according to claim 6, characterized in that: The front end of the second barrel (203) is provided with an injection port (205) which is in communication with the second flow channel (201).

9. The barrel melt venting structure according to claim 6, characterized in that: The connecting barrel assembly (300) includes a connecting barrel (304), and the connecting barrel (304) is provided with the connecting flow channel (301) along its axial direction; the connecting flow channel (301) is provided with a connecting feeding screw (305), and the connecting feeding screw (305) is capable of rotating around its own central axis; and the connecting feeding screw (305) is vertically arranged relative to the first feeding screw (107) and the second feeding screw (204).

10. The barrel melt venting structure according to claim 9, characterized in that: The connecting feeding screw (305) is connected to the first barrel (106) at one end along its axial direction, and the other end is a free end (305a); and the connecting feeding screw (305) can extend out of the first barrel (106), and the end of the connecting feeding screw (305) extending out of the first barrel (106) is connected to a third driving mechanism, and the third driving mechanism can drive the connecting feeding screw (305) to rotate around its own central axis.

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