An EVA injection molding machine screw

Abstract

This utility model provides an EVA injection molding machine screw, relating to the field of injection molding machines. It includes an injection system, the output end of which is connected to the input end of the screw body, and the output end of the screw body is connected to the input end of the mold body. A protective shroud is fitted around the screw body, and a fan is installed on at least one side of the protective shroud. The fan blows air into the protective shroud to cool the molten material transported by the screw body, inhibiting pre-foaming before the material enters the mold. This application, by installing a protective shroud with a fan outside the screw body, can provide real-time air cooling, preventing premature foaming of the material above 80°C, eliminating the need for machine shutdown for cooling, ensuring continuous production, improving efficiency, reducing costs, and solving core problems.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machines, and in particular to an EVA injection molding machine screw. Background Technology

[0002] In the injection molding process of EVA (ethylene-vinyl acetate copolymer) products, the injection molding machine screw plays a crucial role. After the granular EVA raw material is conveyed to the screw through the injection molding system, it will gradually melt under the rotational extrusion of the screw. During this process, the raw material needs to be maintained within a specific temperature range (usually 80°C) to ensure the smooth progress of subsequent molding processes.

[0003] However, in actual production, because the screw needs to operate continuously for extended periods, the EVA raw material experiences constant friction with the screw wall and raw material particles during transport and melting within the screw. This friction continuously generates heat, causing the temperature of the EVA raw material inside the screw to gradually rise. When the temperature exceeds 80°C, the EVA raw material will prematurely foam. However, according to production process requirements, the EVA product must be shaped in an unfoamed state and foaming is only permitted during the painting process at the final assembly plant due to the increased temperature. If foaming occurs prematurely during the injection molding stage, the product will directly fail to meet process standards, essentially rendering it unusable. To address this issue, the traditional approach is to stop the machine and wait for it to cool down naturally when the screw temperature exceeds a set value before restarting it. However, this method severely disrupts the production process, significantly reduces production efficiency, and increases production costs, making it unsuitable for the demands of modern continuous production.

[0004] Therefore, an EVA injection molding machine screw was proposed. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by installing a protective shroud with a fan on the outside of the screw body. This allows for real-time air supply and cooling, preventing materials from foaming prematurely above 80°C. It eliminates the need for machine shutdown for cooling, ensuring continuous production, improving efficiency, reducing costs, and solving core problems.

[0006] To solve the above-mentioned technical problems, this utility model solves the problem of premature foaming caused by heating of EVA injection screw through the following technical solution.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An EVA injection molding machine screw includes an injection system. The output end of the injection system is connected to the input end of the screw body, and the output end of the screw body is connected to the input end of the mold body. A protective shroud is fitted over the screw body, and a fan is provided on at least one side of the protective shroud. The fan blows air into the protective shroud to cool the molten material transported by the screw body and to suppress pre-foaming of the material before it enters the mold.

[0008] Preferably, the length of the protective shroud is equal to the length of the transmission section of the screw body.

[0009] Preferably, the protective wind shield is composed of a rear shield and a front shield, wherein the front shield is rotatably connected to the top of the rear shield via a connecting shaft, and the connecting shaft is detachable.

[0010] Preferably, the bottom of the rear cover is supported and fixed by a number of support members.

[0011] Preferably, a threaded sleeve is fixedly connected to the bottom of the rear cover, the top of the support member is threadedly connected to the corresponding threaded sleeve, and the bottom of the support member is supported on the injection molding machine table and has mounting screw holes for fixing.

[0012] Preferably, the top of the rear cover has a mounting groove, and an outwardly protruding movable frame is connected in the mounting groove. A rotating component is fixedly connected to the top of the front cover. The connecting shaft passes through the movable frame and the rotating component in sequence. The end of the connecting shaft is threaded and threaded with a locking nut.

[0013] Preferably, mounting frames are fixedly provided on both sides of the top of the rear cover, and the air outlet of the fan is inserted into and fixed in the corresponding mounting frame.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The EVA injection molding machine screw provided in this application can deliver air and cool the material in real time by setting a protective shroud with a fan on the outside of the screw body. This prevents the material from foaming prematurely when it exceeds 80°C, eliminates the need to stop the machine for cooling, ensures continuous production, improves efficiency, reduces costs, and solves the core problem.

[0015] The protective shroud of this application is the same length as the screw conveyor section, providing comprehensive cooling and preventing localized high-temperature foaming. The rear shroud and front shroud are connected by a detachable shaft, facilitating opening and closing for observation and maintenance. The support components are adjustable and fixed, ensuring stable fan installation, consistent airflow, enhanced cooling, and improved equipment usability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the disassembled structure of this utility model; Figure 3 This is a schematic diagram of the front cover of the protective wind shield of this utility model in the open state. Figure 4 This is a schematic diagram of the disassembled structure of the protective wind shield of this utility model; Figure 5 For the present utility model Figure 4 Enlarged structural diagram at point A in the middle.

[0018] Drawing number explanation: 1. Injection system; 2. Screw body; 3. Mold body; 4. Protective hood; 41. Rear cover; 411. Mounting frame; 42. Front cover; 411. Mounting frame; 42. Front cover; 5. Fan; 6. Connecting shaft; 61. Movable frame; 62. Rotating component; 63. Locking nut; 7. Support component; 71. Threaded sleeve. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0021] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model 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, the above terms should not be construed as limitations on this utility model.

[0022] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number. Example

[0023] Please see Figure 1-5 An EVA injection molding machine screw includes an injection system 1, the output end of which is connected to the input end of the screw body 2, which can stably deliver EVA raw materials into the screw body 2; the output end of the screw body 2 is connected to the input end of the mold body 3, and the material processed by the screw body 2 can directly enter the mold body 3 for molding operation. The screw body 2 is fitted with a protective shroud 4. The length of the protective shroud 4 is equal to the length of the transmission section of the screw body 2, which can fully cover the material transmission area of ​​the screw body 2 and ensure that the cooling effect covers the entire process of material transmission in the screw body 2.

[0024] The protective wind cover 4 is composed of a rear cover 41 and a front cover 42. The front cover 42 is rotatably connected to the top of the rear cover 41 via a connecting shaft 6, which is detachable. Specifically, the top of the rear cover 41 has a mounting groove, in which an outwardly protruding movable frame 61 is connected. The top of the front cover 42 is fixedly connected to a rotating component 62. The connecting shaft 6 passes through the movable frame 61 and the rotating component 62 in sequence, and is fixed at the end by a threaded locking nut 63. When it is necessary to open the protective wind cover 4 to observe the condition of the screw body 2 or to perform maintenance, the locking nut 63 can be loosened to pull out the connecting shaft 6, allowing the front cover 42 to flip relative to the rear cover 41. This operation is flexible and convenient, adaptable to different installation environments, and easy to disassemble and assemble. The bottom of the rear cover 41 is supported and fixed by several support members 7. Several threaded sleeves 71 are fixedly connected to the bottom of the rear cover 41. The top of the support member 7 is provided with a threaded section, which can be threadedly connected with the corresponding threaded sleeve 71, so as to facilitate the adjustment of the installation position of the support member 7 according to actual needs. The bottom of the support member 7 is supported on the injection molding machine table and is provided with mounting screw holes, which can be further fixed by bolts to ensure that the protective wind cover 4 remains stable during operation. A fan 5 is provided on at least one side of the protective hood 4, and mounting frames 411 are fixedly provided on both sides of the top of the rear cover 41. The air outlet of the fan 5 is inserted into and fixed in the mounting frame 411 to ensure that the fan 5 delivers stable air into the protective hood 4, continuously cooling the molten material transmitted by the screw body 2, and effectively suppressing the pre-foaming phenomenon of the material before entering the mold.

[0025] Working principle During the EVA injection molding process, the injection system 1 delivers granular EVA raw materials into the screw body 2. The screw body 2 extrudes, conveys, and melts the raw materials during rotation. Due to the heat generated by the friction between the raw materials and the screw wall and the raw material particles, the material temperature inside the screw body 2 gradually rises. At this time, the fans 5 on both sides of the protective shroud 4 start up and continuously supply air into the protective shroud 4. The airflow forms a stable air duct inside the protective shroud 4, flows through the outside of the screw body 2, and carries away the excess heat generated by friction in the screw body 2 through air convection, so that the temperature of the molten material transmitted in the screw body 2 is maintained within the set range of 80°, and the temperature is prevented from being too high, which would cause the EVA raw material to foam prematurely. When it is necessary to check the working status of the screw body 2 or perform maintenance, the locking nut 63 can be loosened, the connecting shaft 6 can be pulled out, the front cover 42 can be flipped around the rear cover 41 to open, and after the operation is completed, the front cover 42 can be closed again, the connecting shaft 6 can be inserted, and the locking nut 63 can be tightened to restore normal operation. The support component 7, through its connection with the threaded sleeve 71 and its bottom fixation, ensures the stability of the protective wind cover 4 during the operation of the fan 5 and the screw body 2, ensuring that the cooling process is continuous and efficient.

[0026] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. An EVA injection molding machine screw, characterized in that, The system includes an injection system (1), the output end of which is connected to the input end of a screw body (2), the output end of which is connected to the input end of a mold body (3), a protective hood (4) is provided on the outside of the screw body (2), and a fan (5) is provided on at least one side of the protective hood (4). The fan (5) sends air into the protective hood (4) to cool down the molten material transmitted by the screw body (2) and suppress pre-foaming of the material before it enters the mold.

2. The EVA injection molding machine screw according to claim 1, characterized in that: The length of the protective wind shield (4) is equal to the length of the transmission section of the screw body (2).

3. The EVA injection molding machine screw according to claim 1, characterized in that: The protective wind shield (4) is composed of a rear cover (41) and a front cover (42). The front cover (42) is rotatably connected to the top of the rear cover (41) via a connecting shaft (6), which is detachable.

4. The EVA injection molding machine screw according to claim 3, characterized in that: The bottom of the rear cover (41) is supported and fixed by several support members (7).

5. The EVA injection molding machine screw according to claim 4, characterized in that: The bottom of the rear cover (41) is fixedly connected to a threaded sleeve (71), the top of the support member (7) is threadedly connected to the corresponding threaded sleeve (71), and the bottom of the support member (7) is supported on the injection molding machine table and has mounting screw holes for fixing.

6. The EVA injection molding machine screw according to claim 3, characterized in that: The rear cover (41) has an installation groove on its top, and an outwardly protruding movable frame (61) is connected in the installation groove. The front cover (42) has a rotating component (62) fixedly connected to its top. The connecting shaft (6) passes through the movable frame (61) and the rotating component (62) in sequence. The end of the connecting shaft (6) is threaded and threaded with a locking nut (63).

7. An EVA injection molding machine screw according to claim 3, characterized in that: Mounting frames (411) are fixedly installed on both sides of the top of the rear cover (41), and the air outlet of the fan (5) is inserted into and fixed in the corresponding mounting frame (411).

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