A cast film extrusion mechanism

Abstract

The utility model belongs to the extrusion technology field of casting machine, concretely relates to a casting machine extrusion mechanism, including sleeve, be equipped with working cavity in the sleeve, sleeve one end is equipped with the discharge gate, the sleeve is assembled with the extrusion screw in, the upper surface of sleeve far away from the discharge gate one side is equipped with the feed port, the feed port is assembled with the intruding piece, the intruding piece upper side is connected with the feed frame, the feed frame upper side is connected with the storage hopper, rotationally assembled with the rotating shaft in the feed frame, rotating shaft is equipped with a plurality of agitating components from left to right, and the agitating component includes three agitating seats, three agitating seats annular even array are equipped on the rotating shaft outer surface, the feed frame one side is equipped with the handle connected with the rotating shaft, in the material easy to block section of the storage hopper and the feed frame junction, set up the agitating component of manual drive multiple groups, only through rotating handle can drive the agitating seat to do the circumferential motion, directly destroy the jamming structure of plastic particle bridging, compaction formation, and the falling smoothness of material is recovered quickly.

Description

Technical Field

[0001] This utility model belongs to the field of extrusion technology for casting machines, and specifically relates to an extrusion mechanism for a casting machine. Background Technology

[0002] Casting machines are core forming equipment in the industrial production of plastic films. Relying on core processes such as melt extrusion, casting, biaxial stretching, and shaping and winding, they can produce functional plastic films with uniform thickness and stable performance. These products are widely used in food packaging, electronic insulation, photovoltaic encapsulation, and many other fields. In the entire process, the melt extrusion section is the core link ensuring the plasticization quality of the film and the continuity of production; its core execution unit is the screw-type extrusion mechanism.

[0003] A conventional screw extrusion mechanism mainly consists of an extrusion sleeve, a conveying screw, a feed inlet, and a gravity-fed storage hopper. Plastic granules are initially stored temporarily in the upper funnel-shaped storage hopper and fall into the inner cavity of the sleeve through the feed inlet under their own gravity. Subsequently, the material is conveyed axially forward by the spiral thrust of the rotating screw. During this conveying process, it continuously absorbs heat transferred from the heating system on the outer wall of the sleeve, gradually completing the glass transition, melting, and plasticizing processes. Finally, it is quantitatively extruded as a uniform melt to the downstream casting die, providing a stable material flow for subsequent film forming.

[0004] In gravity-feed mode, this structure commonly suffers from the common problem of material bridging (also known as arching). The bridging phenomenon is caused by a combination of factors, including the structure, materials, and equipment compatibility: First, the conical constriction of the funnel-shaped hopper provides a structural basis for bridging. When the sum of the internal friction between material particles and the external friction between the particles and the hopper wall exceeds the weight of the material itself, the particles will support and interlock with each other at the lower constriction of the hopper, forming a stable arched material structure that completely blocks the downward flow of material above. Second, if the plastic particles have uneven particle size distribution, irregular shape, or if the adhesion between particles increases due to high ambient humidity or static electricity on the surface, the interlocking and support effect between particles will be further strengthened, significantly increasing the probability of bridging and the stability of the blockage. Third, insufficient material dragging capacity of the screw feed section at the inlet prevents the timely transport of material from the inlet area into the screw channel, causing the material to continuously accumulate and compact above the inlet, further inducing and exacerbating bridging blockage. Utility Model Content

[0005] The purpose of this invention is to provide an extrusion mechanism for a casting machine to solve the problems existing in the background art.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows: An extrusion mechanism for a casting machine includes a sleeve with a working chamber inside. One end of the sleeve has a discharge port. An extrusion screw is installed inside the sleeve. A feed port is located on the upper surface of the sleeve away from the discharge port. An extension member is installed inside the feed port. A feed frame is connected to the upper side of the extension member. A storage hopper is connected to the upper side of the feed frame. A rotating shaft is rotatably mounted inside the feed frame. Several agitation components are arranged from left to right on the rotating shaft. Each agitation component includes three agitator seats, which are evenly arranged in a ring on the outer surface of the rotating shaft. A handle connected to the rotating shaft is located on one side of the feed frame.

[0007] The rotating shaft has a cavity inside. The end of the rotating shaft away from the handle is connected to the inner wall of the feed frame. A fixed shaft extending into the cavity is fixedly connected to the inner wall of the feed frame. The fixed shaft and the rotating shaft are concentrically arranged. The fixed shaft is equipped with a top part that matches the stirring assembly.

[0008] The ejector portion includes three ejector mechanisms and a cam. The three ejector mechanisms are respectively assembled in three agitator seats. Each ejector mechanism includes a through hole that passes through the agitator seat from the top and communicates with the cavity. A ejector pin is slidably assembled in the through hole. The upper end of the ejector pin can extend out of the through hole. A ball is assembled at the end of the ejector pin that extends into the cavity. The cam is fixedly connected to a fixed shaft. The position of the cam matches that of the ejector pin. The protruding end of the cam faces directly upward.

[0009] The stirring seat has a mounting cavity connected to the through hole. The mounting cavity has a limiting ring that matches the ejector pin. The upper side of the limiting ring has a spring sleeved on the outer surface of the ejector pin.

[0010] One end of the fixed shaft is rotatably connected to the inner wall of the cavity.

[0011] A sealing strip is provided between the extension part and the feed port, and the extension part is connected to the outer surface of the sleeve by bolts.

[0012] The outer surface of the feed frame is provided with a transparent observation window.

[0013] This utility model has the following technical advantages compared with the prior art: In the material-prone blockage section where the storage hopper connects to the feed frame, multiple manually driven agitator components are installed. Without stopping the machine to disassemble the feed structure, simply turning the handle will drive the agitator to make a circular motion, directly breaking the blockage structure formed by the bridging and compaction of plastic granules, quickly restoring the smooth flow of material, ensuring the continuity of extrusion feeding, and reducing production interruption losses caused by machine shutdown for unblocking.

[0014] Based on the circumferential stirring, a push-out mechanism consisting of a fixed cam and a follower ejector pin is used. Relying on the directional design of the cam protrusion, the ejector pin extends synchronously when the stirring seat rotates to the upper position and automatically retracts after rotation. This further breaks the mechanical support balance of compacted particles and improves the dispersing efficiency and unblocking effect of agglomerated materials.

[0015] The feeding assembly adopts an assembly form in which the insert is plugged into the sleeve feed port. With the help of the sealing strip, the feeding channel is sealed and protected. At the same time, it is fastened to the outer wall of the sleeve by bolts, which not only effectively prevents material leakage and improves the feeding sealing performance, but also supports the overall disassembly and assembly of the feeding assembly, which is convenient for daily maintenance, cleaning and component replacement, and adapts to the feeding conditions of different materials.

[0016] The ejector mechanism uses a ball bearing in rolling contact with the cam working surface, combined with an elastic reset structure consisting of a limit ring and a spring, which ensures that the ejector pin is always in close contact with the cam working surface throughout the entire rotation process, resulting in precise action response and no hard impact. The fixed shaft support design improves the coaxiality of the rotating shaft, reduces the risk of wear during long-term operation, and improves the overall service life and operational stability of the mechanism. Attached Figure Description

[0017] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the sleeve of this utility model; Figure 3 This is a schematic diagram of the extrusion screw of this utility model; Figure 4 This is a schematic diagram of the structure of the storage hopper of this utility model. Figure 1 ; Figure 5 This is a schematic diagram of the structure of the storage hopper of this utility model. Figure 2 ; Figure 6 This is a cross-sectional structural diagram of the storage hopper of this utility model; Figure 7 for Figure 6 A magnified structural diagram of point A in the middle.

[0019] The symbols for the main components are explained below: Sleeve 1, Working chamber 11, Discharge port 12, Extrusion screw 13, Inlet port 14, Extension part 2, Feed frame 21, Storage hopper 22, Rotating shaft 23, Agitator seat 24, Handle 25, Cavity 26, Fixed shaft 3, Cam 31, Through hole 32, Ejector pin 33, Ball bearing 34, Mounting cavity 35, Limiting ring 36, Spring 37. Detailed Implementation

[0020] 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.

[0021] In the description of the embodiments of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0023] like Figure 1-7 As shown, the present invention discloses an extrusion mechanism for a casting machine, comprising a sleeve 1, a working chamber 11 inside the sleeve 1, a discharge port 12 at one end of the sleeve 1, an extrusion screw 13 inside the sleeve 1, a feed port 14 on the upper surface of the sleeve 1 away from the discharge port 12, an extension member 2 inside the feed port 14, a feed frame 21 connected to the upper side of the extension member 2, a storage hopper 22 connected to the upper side of the feed frame 21, a rotating shaft 23 rotatably mounted inside the feed frame 21, a plurality of agitation components arranged from left to right on the rotating shaft 23, the agitation components including three agitation seats 24, the three agitation seats 24 being arranged in a circular and uniform array on the outer surface of the rotating shaft 23, and a handle 25 connected to the rotating shaft 23 on one side of the feed frame 21.

[0024] The sleeve 1 is installed in the casting machine, the discharge port 12 is connected to the forming structure of the casting machine, the extrusion screw 13 is assembled in the sleeve 1 and is driven by a motor. The motor can drive the extrusion screw 13 to rotate in the sleeve 1. The protruding threads on the outer surface of the extrusion screw 13 can agitate and transport the raw material in the sleeve 1. The insert 2 can be inserted into the feed inlet 14. The insert 2 is connected to the storage hopper 22 through the feed frame 21. Plastic granules are injected into the storage hopper 22. The plastic granules in the storage hopper 22 fall downward under the action of gravity, pass through the feed frame 21 and the insert 2 and enter the feed inlet 14. They come into contact with the extrusion screw 13 in the sleeve 1. The plastic is transported under the action of the rotation of the extrusion screw 13. When plastic blockage occurs at the connection between the storage hopper 22 and the feed frame 21, the handle 25 can be rotated directly. The handle 25 drives the rotating shaft 23 to start rotating. When the rotating shaft 23 rotates, it drives several agitator components to start rotating. The agitator components have three agitator seats 24. Therefore, when the rotating shaft 23 rotates, the agitator seats 24 agitate the plastic particles, agitate the blockage and compacted plastic particles, destroy the support of the compacted particles, and make the particles slide down again, thus completing the unblocking of the plastic blockage.

[0025] The rotating shaft 23 has a cavity 26 inside. The end of the rotating shaft 23 away from the handle 2 is connected to the inner wall of the feed frame 21. A fixed shaft 3 extending into the cavity 26 is fixedly connected to the inner wall of the feed frame 21. The fixed shaft 3 and the rotating shaft 23 are concentrically arranged. The fixed shaft 3 is equipped with a top part that matches the stirring component.

[0026] The fixed shaft 3 extends into the rotating shaft 23 and is fixedly connected to the inner wall of the feed frame 21. Therefore, when the rotating shaft 23 rotates, it will not drive the fixed shaft 3 to rotate. The fixed shaft 3 is equipped with an ejector part that matches the agitator. When the agitator seat 24 of the agitator rotates to face directly upward, the ejector part extends out of the agitator seat 24, further disrupting the balance of the blocked and compacted plastic particles and improving the unblocking effect. When the agitator seat 24 moves past the side facing directly upward, the ejector part retracts into the agitator seat 24. Therefore, the ejector part alternately extends out of the agitator seat 24 and retracts into the agitator seat 24, improving the unblocking effect on the plastic.

[0027] The ejector section includes three ejector mechanisms and a cam 31. The three ejector mechanisms are respectively installed in three agitator seats 24. Each ejector mechanism includes a through hole 32 that passes through the agitator seat 24 from the top and communicates with the cavity 26. A ejector pin 33 is slidably installed in the through hole 32. The upper end of the ejector pin 33 can extend out of the through hole 32. A ball bearing 34 is installed at the end of the ejector pin 33 that extends into the cavity 26. The cam 31 is fixedly connected to the fixed shaft 3. The cam 31 and the ejector pin 33 are matched in position. The protruding end of the cam 31 faces directly upward.

[0028] During the rotation of the rotating shaft 23, the agitator 24 is driven to rotate around the fixed shaft 3. The ball 34 is always in contact with the surface of the cam 31, and the protruding end of the cam 31 faces directly upward. When the agitator 24 rotates to face upward, the ball 34 moves to the protruding part of the cam 31, thus pushing the ejector pin 33 upward out of the agitator 24, improving the unblocking effect on the plastic. When the agitator 24 continues to rotate, the ball 34 moves out of the protruding part of the cam 31, and the ejector pin 33 is put into the through hole 32 inside the agitator 24.

[0029] The agitator 24 has a mounting cavity 35 connected to the through hole 32. The mounting cavity 35 has a limiting ring 36 that matches the ejector pin 33. A spring 37 is sleeved on the outer surface of the ejector pin 33 on the upper side of the limiting ring 36. When the ejector pin 33 moves upward, it drives the limiting ring 36 to move upward, and the spring 37 is compressed. When the ball 34 moves out of the protruding part of the cam 31, the spring 37 stretches and drives the ejector pin 33 to return to its original position, thereby ensuring that the ball 34 is always in contact with the surface of the cam 31.

[0030] One end of the fixed shaft 3 is rotatably connected to the inner wall of the cavity 26. This design improves the stability of the fixed shaft 3.

[0031] A sealing strip is provided between the extension part 2 and the feed inlet 14, and the extension part 2 is connected to the outer surface of the sleeve 1 by bolts. This design can improve the sealing effect between the extension part 2 and the feed inlet 14.

[0032] The outer surface of the feed frame is equipped with a transparent observation window. The transparent observation window design allows the staff to easily observe the inside of the feed frame.

[0033] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An extrusion mechanism for a casting machine, comprising a sleeve, a working chamber therein, a discharge port at one end of the sleeve, an extrusion screw fitted inside the sleeve, and a feed port on the upper surface of the sleeve away from the discharge port, characterized in that: The feed inlet is equipped with an extension member, and the upper side of the extension member is connected to a feed frame. The upper side of the feed frame is connected to a storage hopper. A rotating shaft is rotatably mounted inside the feed frame. The rotating shaft is provided with several agitation components from left to right. Each agitation component includes three agitation seats, which are arranged in a circular and uniform array on the outer surface of the rotating shaft. A handle connected to the rotating shaft is provided on one side of the feed frame.

2. The extrusion mechanism of a casting machine according to claim 1, characterized in that: The rotating shaft has a cavity inside. The end of the rotating shaft away from the handle is connected to the inner wall of the feed frame. A fixed shaft extending into the cavity is fixedly connected to the inner wall of the feed frame. The fixed shaft and the rotating shaft are concentrically arranged. The fixed shaft is equipped with a top part that matches the stirring assembly.

3. The extrusion mechanism of a casting machine according to claim 2, characterized in that: The ejector portion includes three ejector mechanisms and a cam. The three ejector mechanisms are respectively assembled in three agitator seats. Each ejector mechanism includes a through hole that passes through the agitator seat from the top and communicates with the cavity. A ejector pin is slidably assembled in the through hole. The upper end of the ejector pin can extend out of the through hole. A ball is assembled at the end of the ejector pin that extends into the cavity. The cam is fixedly connected to a fixed shaft. The position of the cam matches that of the ejector pin. The protruding end of the cam faces directly upward.

4. The extrusion mechanism of a casting machine according to claim 3, characterized in that: The stirring seat has a mounting cavity connected to the through hole. The mounting cavity has a limiting ring that matches the ejector pin. The upper side of the limiting ring has a spring sleeved on the outer surface of the ejector pin.

5. The extrusion mechanism of a casting machine according to claim 4, characterized in that: One end of the fixed shaft is rotatably connected to the inner wall of the cavity.

6. The extrusion mechanism of a casting machine according to claim 1, characterized in that: The outer surface of the feed frame is provided with a transparent observation window.

7. The extrusion mechanism of a casting machine according to claim 6, characterized in that: A sealing strip is provided between the extension part and the feed port, and the extension part is connected to the outer surface of the sleeve by bolts.

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