A double-barrelled delivery type injection molding structure

Abstract

The application provides a double-cylinder conveying type injection molding structure and belongs to the technical field of injection molding devices.The double-cylinder conveying type injection molding structure comprises a glue injection unit, a melting unit and a feeding unit.The feeding unit is used for feeding the melting unit, the melting unit can send the melted raw material into the glue injection unit, and the glue injection unit is used for injection molding to a mold.The melting unit comprises a screw structure, the screw structure comprises a first blade and a second blade, the first blade is separated from the second blade to form a double-blade structure when low-viscosity raw material is conveyed, the conveying efficiency is improved, the two blades are combined into one blade when the viscosity of the material is moderate, the conveying stability is improved, the raw material is prevented from being blocked, the pitch of the blade is shortened when high-viscosity raw material is conveyed, the shearing force on the material is enhanced, the screw groove volume is reduced, the pushing power is improved, and the problems of easy blocking and low conveying efficiency are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of injection molding device components, specifically relating to a dual-barrel conveying injection molding structure. Background Technology

[0002] An injection molding machine, also known as an injection molding machine or injection molding machine, is a primary molding device used to produce various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. The working principle of an injection molding machine is similar to that of a syringe; it uses the thrust of a screw (or plunger) to inject pre-plasticized molten plastic (i.e., a viscous flow state) into a closed mold cavity, where it solidifies and sets to obtain the finished product.

[0003] Chinese patent CN216635266U discloses an energy-saving dual-barrel conveying injection molding structure, including a first barrel and a second barrel. The first barrel and the second barrel each contain a first screw and a second screw, respectively. The upper rear surface of the first barrel has a feed port. The front end of the second barrel has a melting chamber, and the front end of the second barrel, located outside the melting chamber, has a nozzle for material discharge. A connecting part connects the first barrel and the second barrel, and a discharge channel is provided within the connecting part. This energy-saving dual-barrel conveying injection molding structure improves the connection structure and position between the first barrel and the second barrel, allowing molten plastic to enter the second barrel from the first barrel through the discharge channel. The special structure of the connecting part and the discharge channel prevents overflow of the molten plastic within the melting chamber.

[0004] Different raw materials have different viscosities after melting. When conveying raw materials with relatively high viscosity, the high-viscosity melt has poor fluidity in the screw channel with a large pitch. Therefore, it is easy to "slip" when pushing the material. The melt is conveyed to the melting cavity slowly, resulting in insufficient conveying power, poor conveying effect, and also the risk of blockage. Summary of the Invention

[0005] The purpose of this invention is to provide a dual-barrel conveying injection molding structure, which aims to solve the problem of poor conveying effect of existing energy-saving dual-barrel conveying injection molding structures for high-viscosity materials.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a dual-barrel conveying injection molding structure, comprising: an injection unit, a melting unit, and a feeding unit, wherein the feeding unit is used to supply material to the melting unit, the melting unit is capable of conveying the molten raw material into the injection unit, the injection unit is used for injection molding into the mold, and the melting unit includes:

[0007] The melting cylinder has a melting chamber inside. The melting cylinder is located between the glue injection unit and the feeding unit, and the melting chamber is interconnected with both the glue injection unit and the feeding unit.

[0008] The outer cylinder is hollow inside and is rotatably installed inside the melting cylinder. The outer cylinder is coaxial with the melting cylinder.

[0009] The rotating shaft is rotatably installed inside the outer cylinder. The rotating shaft is coaxial with the outer cylinder, and one end extends to the outside of the outer cylinder to connect to the drive device. An elastic element is provided between the inner bottom wall of the outer cylinder and the rotating shaft. When the rotating shaft and the outer cylinder rotate relative to each other, the elastic element stores energy.

[0010] The first blade is mounted on the outer cylinder and is rotatably fixed to the outer cylinder near the end connected to the glue injection unit.

[0011] The second blade has the same pitch as the first blade and is alternately arranged on the outer cylinder. The second blade is located in the middle of the pitch groove of the first blade. A slide rod is provided on the second blade, and the slide rod slides on the outer cylinder. A slide column is provided on the slide rod, and a threaded groove is provided on the rotating shaft, so that the slide column can slide inside the threaded groove. When the outer cylinder and the rotating shaft rotate relative to each other, the slide column can be pushed to move closer to the end connected to the glue injection unit through the threaded groove.

[0012] A further technical solution of the present invention is that a stop block is provided at the end of the first blade near the elastic member, and the end of the second blade near the elastic member is on the same horizontal line as the stop block, so that the second blade can abut against the stop block.

[0013] A further technical solution of the present invention is that a discharge cylinder is provided between the melting unit and the feeding unit. The discharge cylinder has a cavity inside, which is connected to the melting unit and the feeding unit. A circular groove is provided inside the cavity, and a universal ball is rotatably provided inside the circular groove. The universal ball is in a through state. A dispersing rod is provided on the universal ball. The top end of the dispersing rod extends into the feeding unit, and the bottom end extends into the melting unit. A counterweight is provided at the bottom end, and the counterweight is in contact with one side of the first blade.

[0014] A further technical solution of the present invention is that a slider is provided at one end of the first blade near the material discharge cylinder, and a second groove is provided on the outer cylinder along its axial direction, and the slider slides inside the second groove.

[0015] A further technical solution of the present invention is that there is only one fixed point between the slide rod and the second blade, and the fixed point is located at the end of the second blade away from the elastic element.

[0016] A further technical solution of the present invention is that a limiting groove is provided on the rotating shaft, and a limiting protrusion adapted to the limiting groove is provided on the inner wall of the outer cylinder. Both the limiting groove and the limiting protrusion are arranged in a ring around the axis of the rotating shaft, so that the limiting groove can only rotate inside the limiting protrusion.

[0017] A further technical solution of the present invention is that the length of the second blade is half the length of the first blade.

[0018] A further technical solution of the present invention is that the feeding unit includes a feeding cylinder and a feeding cylinder, the feeding cylinder is located above the feeding cylinder and the two are internally connected, and the discharge cylinder is located at the discharge port of the feeding cylinder.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. By setting up an auger structure, which includes a first blade and a second blade, when conveying low-viscosity raw materials, the first blade and the second blade separate to form a double-blade structure to improve conveying efficiency. When encountering materials with moderate viscosity, the two blades merge into one blade to improve the stability of conveying and avoid material blockage. When conveying high-viscosity raw materials, the blade pitch can be shortened to enhance the shearing force on the material, while reducing the screw groove volume and increasing the pushing power, thus solving the dual problems of easy blockage and low conveying efficiency.

[0021] 2. By setting up a material feeding structure, the material in the feeding cylinder can be conveyed, avoiding the blockage of raw materials in the feeding cylinder. When conveying high-viscosity materials, the counterweight and dispersing rod will not be agitated, thus preventing the raw materials from flowing into the melting unit too quickly and causing blockage inside the melting unit. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the melting unit structure in a specific embodiment of the present invention;

[0025] Figure 3 This is a cross-sectional view of a melting unit in a specific embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the auger structure in a specific embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the internal structure of the auger structure in a specific embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the installation structure of the second blade in a specific embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the installation structure of the first blade and the second blade in a specific embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the feeding mechanism in a specific embodiment of the present invention.

[0031] In the diagram: 1. Glue injection unit; 11. Slide table; 12. Glue injection device; 13. Glue injection nozzle; 14. Feed cylinder; 2. Melting unit; 21. Melting cylinder; 22. Melting chamber; 23. Screw structure; 231. Outer cylinder; 2311. First sluice; 232. Rotating shaft; 2321. Threaded groove; 233. Elastic element; 234. Drive device; 235. First blade; 2351. Abutment block; 236. Second blade; 237. Slide rod; 2371. Slide column; 3. Feeding unit; 31. Feeding cylinder; 32. Feeding cylinder; 4. Discharge mechanism; 41. Discharge cylinder; 42. Cavity; 5. Passing mechanism; 51. Circular groove; 52. Universal ball; 53. Dispersing rod; 54. Counterweight; 55. Slider; 56. Second sluice. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1-8 The present invention provides the following technical solution: a dual-barrel conveying injection molding structure, comprising an injection unit 1, a melting unit 2, and a feeding unit 3.

[0034] The injection unit 1 is installed on the injection molding machine, and the melting unit 2 is installed on the injection unit 1 to melt the material into a fluid. The feeding unit 3 is installed on the melting unit 2 to feed the material into the melting unit 2, allowing the material to be added into the melting unit 2 through the feeding unit 3. Then, the raw material is melted by the melting unit 2, and the molten fluid is sent into the injection unit 1, so that the injection unit 1 injects the material into the mold cavity.

[0035] Please see Figure 1The feeding unit 3 includes a feeding cylinder 31 and a feeding cylinder 32. The feeding cylinder 31 is located above the feeding cylinder 32, and the two are internally connected. The inside of the feeding cylinder 31 is used to store molten raw materials (usually granular raw materials). Since the feeding cylinder 31 is located above the feeding cylinder 32, the molten raw materials can fall into the inside of the feeding cylinder 32 by gravity. The inside of the feeding cylinder 32 is equipped with a feeding device (not shown in the figure). In this embodiment, an auger conveyor is used to facilitate the quantitative conveying of materials. A dropping mechanism 4 is provided at the outlet of the feeding cylinder 32. The dropping mechanism 4 is used to connect the feeding cylinder 32 to the melting unit 2, so that the feeding cylinder 32 can put the raw materials into the inside of the melting unit 2 through the dropping mechanism 4.

[0036] Please see Figure 2 and Figure 3 The material feeding mechanism 4 includes a material feeding cylinder 41, which has a cavity 42 inside. The cavity 42 extends vertically through the material feeding cylinder 41. The top opening of the material feeding cylinder 41 is connected to the first discharge port of the feeding cylinder 32, so that the material in the feeding cylinder 32 can enter the interior of the material feeding cylinder 41 by gravity. The other end of the material feeding cylinder 41 is connected to the melting unit 2 and communicates with the interior of the melting unit 2.

[0037] Please see Figures 3-4 The melting unit 2 includes a horizontally arranged melting cylinder 21, which is cylindrical and has a melting chamber 22 inside. A feed inlet is provided at the top of one end of the melting cylinder 21. The opening at the bottom of the discharge cylinder 41 is connected to the feed inlet, so that the material in the discharge cylinder 41 can enter the interior of the melting chamber 22 by gravity. An auger structure 23 is provided inside the melting cylinder 21. The auger structure 23 is used to transport the raw material inside the melting cylinder 21. During the transport process, the raw material is heated to a solution by a heating unit (not shown in the figure) outside the melting cylinder 21. The auger structure 23 can also transport the solution to the end away from the feed inlet. A second discharge port is provided at the end of the melting chamber 22 away from the feed inlet. The molten raw material transported to the second discharge port by the auger structure 23 will enter the interior of the glue injection unit 1 through the second discharge port.

[0038] Please see Figures 4-7The auger structure 23 includes an outer cylinder 231, which is rotatably disposed inside the melting cylinder 21, and its axis is coaxial with the axis of the melting cylinder 21. The interior of the outer cylinder 231 is hollow, and it has an opening at one end near the discharge cylinder 41. A rotating shaft 232 is disposed in the middle of the outer cylinder 231. The rotating shaft 232 passes through the opening at one end and enters the interior of the outer cylinder 231. The rotating shaft 232 is coaxial with the outer cylinder 231 and can rotate inside the outer cylinder 231. A limiting groove is provided on the rotating shaft 232, and a limiting protrusion adapted to the limiting groove is provided on the inner wall of the outer cylinder 231. The limiting protrusions are all arranged in a ring around the axis of the rotating shaft 232, so that the limiting groove can only rotate inside the limiting protrusion. This limits the degree of freedom of the rotating shaft 232 in the axial direction and prevents the rotating shaft 232 from sliding along its axis inside the outer cylinder 231. An elastic element 233, which is a torsion spring, is provided between the inner bottom wall of the outer cylinder 231 and the rotating shaft 232. One end of the elastic element 233 is fixed to the inner bottom wall of the outer cylinder 231, and the other end is fixed to the end of the rotating shaft 232 away from the discharge cylinder 41. The end of the rotating shaft 232 near the discharge cylinder 41 extends to the outside of the outer cylinder 231 and is connected to the drive device 234 (see [link]). Figure 1 The drive unit 234 drives the rotating shaft 232 to rotate. A mounting bracket is provided on the glue injection unit 1 to fix the drive unit 234, so that the drive unit 234 is fixed on the glue injection unit 1.

[0039] The operation of the drive device 234 can drive the rotating shaft 232 to rotate. When the rotating shaft 232 rotates and the outer cylinder 231 is not under force, the outer cylinder 231 can be driven to rotate synchronously under the action of the elastic element 233. When the outer cylinder 231 is subjected to rotational resistance, the elastic element 233 will store force, so that the outer cylinder 231 and the rotating shaft 232 can generate relative rotation.

[0040] Please see Figures 5-7 The outer wall of the outer cylinder 231 is provided with a first blade 235. The first blade 235 is wound around the outer wall of the outer cylinder 231 and its outer edge contacts the inner wall of the melting cavity 22. The end of the first blade 235 away from the discharge cylinder 41 is rotatably fixed to the outer wall of the outer cylinder 231. When the outer cylinder 231 rotates, it can drive the first blade 235 to rotate. When the first blade 235 rotates, it can transport the raw material in the melting cavity 22.

[0041] The outer wall of the outer cylinder 231 is also provided with a second blade 236. The second blade 236 has the same pitch as the first blade, and its length is half the length of the first blade 235. The second blade 236 is alternately wound around the outer wall of the outer cylinder 231 at the end away from the discharge cylinder 41, and the rotation angle between the first blade 235 and the second blade 236 is 180°, that is, the second blade 236 is located in the middle of the pitch groove of the first blade 235. A sliding rod 237 is provided on the second blade 236. The length direction of the sliding rod 237 is parallel to the axis of the second blade 236. The sliding rod 237 is fixed on the inner side of the second blade 236, and there is only one fixed point between the sliding rod 237 and the second blade 236, located at the end of the second blade 236 near the discharge cylinder 41, so that the second blade 236 can be axially compressed. One fixed point makes the second blade 236 axially compressed. The slide rod 237 will not interfere with the compression of the second blade 236. A first slide groove 2311 is provided on the outer cylinder 231, which penetrates both the inner and outer sides of the outer cylinder 231 and extends along the axial direction of the outer cylinder 231. The slide rod 237 slides in the first slide groove 2311. When the slide rod 237 slides along the first slide groove 2311, it can simultaneously drive the second blade 236 to slide, so that the second blade 236 can slide along the axial direction of the outer cylinder 231. A slide column 2371 is provided on one side of the slide rod 237 inside the outer cylinder 231. A threaded groove 2321 is provided on the rotating shaft 232. The thread direction of the threaded groove 2321 is the same as the thread direction of the second blade 236. The slide column 2371 can extend into the inside of the threaded groove 2321 and slide inside the threaded groove 2321.

[0042] In operation, when conveying low-viscosity raw materials, the drive device 234 drives the rotating shaft 232 to rotate. When the rotating shaft 232 rotates, the viscosity of the raw material is low, so the rotating shaft 232 can drive the outer cylinder 231 to rotate via the elastic element 233. There is no relative rotation between the rotating shaft 232 and the outer cylinder 231. Since one end of the first blade 235 is rotatably fixed to the outer cylinder 231, and the second blade 236 is mounted on the outer cylinder 231 via the slide rod 237, when the outer cylinder 231 rotates, it can simultaneously drive the first blade 235 and the second blade 236 to rotate. Furthermore, there is a gap between the first blade 235 and the second blade 236, which improves the conveying efficiency of the double-blade conveyor. When conveying raw materials of moderate viscosity, the viscosity of the raw material... Due to its characteristics, the outer cylinder 231 and the blades will experience significant resistance to rotation. Therefore, when the shaft 232 rotates, the outer cylinder 231 is subjected to resistance from the raw material. As a result, the rotation of the shaft 232 will cause the elastic element 233 to twist and store energy, resulting in relative rotation between the shaft 232 and the outer cylinder 231. At this time, the slide column 2371 will slide inside the threaded groove 2321 and drive the slide rod 237 to move in the direction of material conveying until the first blade 235 and the second blade 236 come into contact and merge into a single blade. When the outer cylinder 231 rotates, it can drive the merged blade to rotate. Thus, when conveying materials of moderate viscosity, the contact area between the raw material and the blade can be reduced, making the material conveying smoother and avoiding the problem of material blockage.

[0043] Please see Figure 4 A stop block 2351 is provided at the end of the first blade 235 away from the discharge cylinder 41. The stop block 2351 is located on the side that can fit with the second blade 236. The end of the second blade 236 away from the discharge cylinder 41 is on the same horizontal line as the stop block 2351, so that the second blade 236 can accurately abut against the stop block 2351 when it moves.

[0044] In use, when conveying high-viscosity raw materials, after the first blade 235 and the second blade 236 come into contact, due to the characteristics of the high-viscosity raw materials, the elastic element 233 will continue to store energy, and the rotating shaft 232 and the outer cylinder 231 will continue to rotate relative to each other. The slide rod 237 continues to drive the second blade 236 to move away from the discharge cylinder 41. Since one end of the second blade 236 abuts against the stop block 2351, and the first blade 235 is rotatably fixed on the outer cylinder 231 at one end of the stop block 2351, when the slide rod 237 pushes the second blade 236 to move, the end of the first blade 235 away from the discharge cylinder 41 and the second blade 236 can be compressed, making the pitch of this part smaller. This can enhance the shearing and squeezing effect of the blades on the high-viscosity melt, while reducing the screw groove volume and increasing the pushing power, thus solving the dual problems of easy clogging and inefficient conveying.

[0045] Please see Figure 8 The material feeding cylinder 41 is equipped with a material feeding mechanism 5. The material feeding mechanism 5 includes a circular groove 51 rotatably disposed inside the material feeding cylinder 41. A universal ball 52 is rotatably disposed inside the circular groove 51. The universal ball 52 is vertically connected, allowing the material feeding cylinder 41 to be vertically connected, so that the raw material can pass through the material feeding cylinder 41 and the universal ball 52 into the melting unit 2. A dispersing rod 53 is disposed in the middle of the universal ball 52 via a connecting rod. The top end of the dispersing rod 53 extends into the feeding unit 3, and the bottom end extends into the melting unit 2. A counterweight 54 is fixedly disposed at the bottom end of the dispersing rod 53, and the counterweight 54 is in contact with one side of the first blade 235. A slider 55 is disposed at the end of the first blade 235 near the material feeding cylinder 41. A second sliding groove 56 is disposed on the outer cylinder 231 along its axial direction, and the slider 55 slides inside the second sliding groove 56.

[0046] When the melting unit 2 is not blocked or the raw material is of low viscosity, the rotation of the first blade 235 will cause the counterweight 54 and the dispersing rod 53 to swing, making the dispersing rod 53 agitate inside the discharge cylinder 41. This promotes the flow of raw material inside the discharge cylinder 41, allowing the raw material to fall into the melting unit 2 more quickly and avoiding blockage of the raw material in the discharge cylinder 41. When conveying high-viscosity materials, due to the high viscosity of the material and the slow conveying speed, one end of the first blade 235 is compressed, and the end of the first blade 235 near the discharge cylinder 41 slides inside the second chute 56, causing the first blade 235 to disengage from the counterweight 54. Therefore, when the first blade 235 rotates to convey the material, it will not cause the counterweight 54 and the dispersing rod 53 to swing, thus preventing the raw material from flowing into the melting unit 2 too quickly and causing blockage.

[0047] Please see Figure 1 The glue injection unit 1 includes a slide table 11, on which a glue injection device 12 is provided. The glue injection device 12 is provided with a glue injection nozzle 13 and a feed cylinder 14. The inner cavity of the melting cylinder 21 is connected to the inside of the glue injection device 12 through the feed cylinder 14, so that the molten raw material can enter the inside of the glue injection device 12 through the feed cylinder 14. Then, an extrusion auger (not shown in the figure) is provided inside the glue injection device 12. Through the action of the extrusion auger, the raw material inside the feed cylinder 14 can be squeezed out from the glue injection nozzle 13. The glue injection nozzle 13 is connected to the mold, so that the raw material enters the mold through the glue injection nozzle 13 and finally cools and forms the mold.

Claims

1. A dual-barrel conveying injection molding structure, comprising: The unit comprises an injection unit (1), a melting unit (2), and a feeding unit (3). The feeding unit (3) is used to supply material into the melting unit (2). The melting unit (2) can deliver the molten material into the injection unit (1). The injection unit (1) is used to inject the material into the mold. The characteristic feature is that the melting unit (2) includes: The melting cylinder (21) has a melting chamber (22) inside. The melting cylinder (21) is located between the glue injection unit (1) and the feeding unit (3), and the melting chamber (22) is connected to the glue injection unit (1) and the feeding unit (3). The outer cylinder (231) is hollow inside and is rotatably installed inside the melting cylinder (21). The outer cylinder (231) and the melting cylinder (21) are coaxially arranged. A rotating shaft (232) is rotatably disposed inside the outer cylinder (231). The rotating shaft (232) is coaxially disposed with the outer cylinder (231), and one end extends to the outside of the outer cylinder (231) to connect to the drive device (234). An elastic element (233) is disposed between the inner bottom wall of the outer cylinder (231) and the rotating shaft (232). When the rotating shaft (232) and the outer cylinder (231) rotate relative to each other, the elastic element (233) stores energy. The first blade (235) is set on the outer cylinder (231) and is rotatably fixed on the outer cylinder (231) near the end connected to the glue injection unit (1); The second blade (236) has the same pitch as the first blade (235) and is alternately arranged on the outer cylinder (231). The second blade (236) is located in the middle of the pitch groove of the first blade (235). A slide rod (237) is provided on the second blade (236). The slide rod (237) can slide along the outer cylinder (231). A slide column (2371) is provided on the slide rod (237). A threaded groove (2321) is provided on the rotating shaft (232) so that the slide column (2371) can slide inside the threaded groove (2321). When the outer cylinder (231) and the rotating shaft (232) rotate relative to each other, the threaded groove (2321) pushes the slide column (2371) to move towards the glue injection unit (1).

2. The dual-barrel conveying injection molding structure according to claim 1, characterized in that: The first blade (235) has a stop block (2351) at one end near the elastic member (233), and the second blade (236) is on the same horizontal line as the stop block (2351) at one end near the elastic member (233), so that the second blade (236) can abut against the stop block (2351).

3. The dual-barrel conveying injection molding structure according to claim 2, characterized in that: A discharge cylinder (41) is provided between the melting unit (2) and the feeding unit (3). A cavity (42) is provided inside the discharge cylinder (41). The cavity (42) is connected to the melting unit (2) and the feeding unit (3). A circular groove (51) is provided inside the cavity (42). A universal ball (52) is rotatably provided inside the circular groove (51). The universal ball (52) is in a through state. A dispersing rod (53) is provided on the universal ball (52). The top end of the dispersing rod (53) extends into the feeding unit (3), and the bottom end extends into the melting unit (2). A counterweight (54) is provided at the bottom end, and the counterweight (54) is in contact with one side of the first blade (235).

4. The dual-barrel conveying injection molding structure according to claim 3, characterized in that: The first blade (235) is provided with a slider (55) at one end near the discharge cylinder (41), and the outer cylinder (231) is provided with a second groove (56) arranged along its axial direction, and the slider (55) slides inside the second groove (56).

5. The dual-barrel conveying injection molding structure according to claim 2, characterized in that: There is only one fixed point between the slide bar (237) and the second blade (236), and it is located at the end of the second blade (236) away from the elastic element (233).

6. The dual-barrel conveying injection molding structure according to claim 1, characterized in that: The rotating shaft (232) is provided with a limiting groove, and the inner wall of the outer cylinder (231) is provided with a limiting protrusion that matches the limiting groove. Both the limiting groove and the limiting protrusion are arranged in a ring around the axis of the rotating shaft (232), so that the limiting groove can only rotate inside the limiting protrusion.

7. The dual-barrel conveying injection molding structure according to claim 1, characterized in that: The length of the second blade (236) is half the length of the first blade (235).

8. The dual-barrel conveying injection molding structure according to claim 1, characterized in that: The feeding unit (3) includes a feeding cylinder (31) and a feeding cylinder (32). The feeding cylinder (31) is located above the feeding cylinder (32), and the two are internally connected. The discharge cylinder (41) is located at the discharge port of the feeding cylinder (32).

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