Injection molding device for soundproof cotton production

Abstract

The application relates to the technical field of soundproof cotton production, in particular to an injection molding device for soundproof cotton production, which comprises a machine base, a mold and a base cylinder are arranged on the machine base, one end of the base cylinder is provided with an injection port, the injection port is communicated with the mold, a screw base rod, a screw head, a plugging ring, a first reverse-stopping ring, an intermediate ring and an elastic piece are inserted in the base cylinder, a plurality of first protrusions are arranged on the screw head in a circumferential direction, a first blocking ring is sleeved on one end of the screw head close to the screw base rod, a plurality of second protrusions are arranged on the end face of the plugging ring away from the injection port, the first reverse-stopping ring can form a sealed and stopped cooperation with the first blocking ring, a plurality of third protrusions are arranged on the end face of the intermediate ring towards the injection port, and the third protrusions can form a guiding cooperation with the second protrusions, so that when the screw head extrudes the molten raw material, the third protrusions and the second protrusions are both inserted between adjacent first protrusions, and the space between the screw head and the base cylinder is completely filled under the cooperation with the plugging ring, so that material stagnation is avoided.

Description

Technical Field

[0001] This invention relates to the field of sound insulation cotton production technology, and in particular to an injection molding device for producing sound insulation cotton. Background Technology

[0002] Sound insulation cotton, a widely used material in the fields of architectural acoustics and noise control engineering, has the core function of effectively absorbing and reducing noise. In practical applications, it plays an indispensable role in both sound insulation and noise reduction inside buildings and noise control of mechanical equipment.

[0003] The production process of sound insulation cotton includes steps such as raw material preparation, mold design and manufacturing, injection molding and post-processing. Among them, the injection molding process is one of the key steps that determines the quality and performance of sound insulation cotton products, and the injection molding machine plays a crucial role in the injection molding process.

[0004] In related technologies, such as Chinese patent CN111844603B, an industrial injection molding machine is disclosed. During the injection molding process, the machine uses a screw rod to transport the material added at one end of the barrel to the other end for injection molding. By setting a check ring, the machine effectively prevents the material from flowing back during the injection molding process, thus ensuring the stability of the injection molding process and the normal transport of the material to a certain extent.

[0005] However, existing injection molding machines are prone to material stagnation near the check ring when injection molding sound insulation cotton. This stagnation not only leads to material waste and increases production costs, but more importantly, it has a serious impact on injection molding quality: the presence of stagnation may change the composition ratio and performance parameters of the subsequent injection molding materials, causing fluctuations in the quality and performance of the injection-molded sound insulation cotton products, which cannot meet strict quality standards and actual use requirements. Summary of the Invention

[0006] Therefore, it is necessary to provide an injection molding device for producing sound insulation cotton to address the problem of poor finished product quality in the current injection molding process.

[0007] The above objectives are achieved through the following technical solutions:

[0008] An injection molding device for producing sound insulation cotton includes a base, a mold and a base cylinder on the base, a molding cavity formed inside the mold, an injection port at one end of the base cylinder that communicates with the molding cavity, and a switch valve at the injection port; a feed hopper and a heat source are provided on the base cylinder, the feed hopper is connected to the base cylinder and located away from the injection port, and is used to store raw materials, the heat source is used to heat the raw materials in the base cylinder; a screw rod, a screw head, a sealing ring, a first check ring, an intermediate ring and an elastic element are inserted into the base cylinder, the screw rod and the base cylinder are coaxially arranged, a first helical blade is fixedly sleeved on the screw rod, the screw rod can rotate around its own axis and slide along its own axis direction, the screw head is coaxially arranged on the screw rod and located close to the injection port, and is rotatably connected to the screw rod, the screw head along the circumferential direction Multiple first protrusions are spaced apart. A first retaining ring is fitted onto the end of the screw head near the screw base. A sealing ring is positioned near the injection port and can be fitted onto the screw head. Multiple second protrusions are spaced apart circumferentially on the end face of the sealing ring facing away from the injection port. The second protrusions can be inserted between adjacent first protrusions. A first check ring is coaxial with the base cylinder and is movably positioned. The first check ring can form a sealing stop with the first retaining ring. An intermediate ring is coaxial with the first check ring and can be rotatably positioned relative to it. It is connected to the first check ring through an elastic element. The intermediate ring is positioned closer to the injection port than the first check ring. Multiple third protrusions are spaced apart circumferentially on the end face of the intermediate ring facing the injection port. The third protrusions can be inserted between adjacent first protrusions and adjacent second protrusions, and can form a guiding fit with the first protrusions.

[0009] Furthermore, a second helical blade and a second retaining ring are also sleeved on the screw base. The second helical blade is positioned closer to the injection port than the first helical blade, and the second retaining ring is located between the second helical blade and the first helical blade. A second check ring is also coaxially and movably inserted inside the base cylinder. The second check ring can form a stop engagement with the second helical blade and a sealing stop engagement with the second retaining ring. The injection molding device for producing sound insulation cotton also includes a supercritical fluid injection system, which is configured to inject SCF into the base cylinder to achieve mixing of SCF and raw materials.

[0010] Furthermore, the supercritical fluid injection system includes a gas storage cylinder, an SCF controller, an SCF interface assembly, and an SCF air pump head connected in sequence. The gas storage cylinder stores nitrogen or oxygen. The SCF air pump head is mounted on the base cylinder and communicates with the base cylinder, and is correspondingly positioned with the second helical blade.

[0011] Furthermore, the second helical blade has multiple sub-blades, with adjacent sub-blades spaced apart.

[0012] Furthermore, the blades are staggered at the gaps between adjacent blades along the axial direction of the screw base.

[0013] Furthermore, the elastic element is a torsion spring.

[0014] Furthermore, the heat source includes a power supply and multiple thermal resistance rings. The power supply is mounted on the base, and all the thermal resistance rings are electrically connected. The thermal resistance rings are fitted onto the base cylinder, and the multiple thermal resistance rings are arranged at intervals along the axial direction of the base cylinder.

[0015] Furthermore, the injection molding device for producing sound insulation cotton also includes a drive assembly configured to provide a driving force for the screw base to slide along its own axis.

[0016] Furthermore, the injection molding device for producing sound insulation cotton also includes a drive component configured to provide a driving force for the screw base to rotate about its own axis.

[0017] Furthermore, a receiving box is also provided on the machine base, located below the mold.

[0018] The beneficial effects of this invention are:

[0019] The injection molding device for producing sound insulation cotton provided by this invention, during the process of extruding molten raw material into the molding cavity, as the screw head moves towards the injection port, firstly, the first retaining ring and the first check ring form a sealing stop to seal the cavity between the screw head and the base cylinder. Then, the screw head synchronously drives the first check ring and the intermediate ring to move to the third protrusion through the first retaining ring. The first protrusion inserts between the adjacent second protrusion, so that the space between the screw head and the base cylinder can be filled with the cooperation of the sealing ring, thereby preventing material from accumulating between the first check ring and the screw head, thus avoiding the phenomenon of material stagnation. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of an injection molding device for producing sound insulation cotton provided in an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of the injection molding device for producing sound insulation cotton provided in an embodiment of the present invention;

[0022] Figure 3 for Figure 2 A magnified view of the structure at point A in the middle;

[0023] Figure 4 A three-dimensional structural diagram of the screw base rod, screw head, sealing ring, intermediate ring, first check ring and piston ring of the injection molding device for producing sound insulation cotton provided in an embodiment of the present invention during assembly;

[0024] Figure 5 An exploded view of the screw base rod, screw head, sealing ring, intermediate ring, first check ring, and piston ring of the injection molding device for producing sound insulation cotton provided in an embodiment of the present invention;

[0025] Figure 6 This is a diagram showing the state of the screw head of the injection molding device for producing sound insulation cotton provided in an embodiment of the present invention when it is far away from the sealing ring.

[0026] in:

[0027] 1. Base; 2. Mold; 3. Base cylinder; 301. Injection port; 4. Switch valve; 5. Feed hopper; 601. Thermal resistance ring; 7. Screw base; 701. First helical blade; 702. Second helical blade; 703. Second retaining ring; 8. Screw head; 801. First protrusion; 802. First retaining ring; 9. Sealing ring; 901. Second protrusion; 10. First check ring; 11. Intermediate ring; 1101. Third protrusion; 12. Torsion spring; 13. Second check ring; 14. SCF air inflator; 15. Hydraulic cylinder body; 16. Piston ring; 17. Hollow motor; 18. Receiving box. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0029] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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 limiting the invention.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] like Figures 1 to 6As shown in the embodiment of the present invention, the injection molding device for producing sound insulation cotton is used for injection molding sound insulation cotton and is configured to include a base 1, on which a mold 2 and a base cylinder 3 are provided. A molding cavity is formed inside the mold 2. An injection port 301 is provided at one end of the base cylinder 3, and the injection port 301 is connected to the molding cavity. A switch valve 4 is provided at the injection port 301. A feed hopper 5 and a heat source are provided on the base cylinder 3. The feed hopper 5 is connected to the base cylinder 3 and is located away from the injection port 301, and is used to store raw materials. The heat source is used for heating. The raw material is inside the base cylinder 3; the base cylinder 3 is equipped with a screw rod 7, a screw head 8, a sealing ring 9, a first check ring 10, an intermediate ring 11, and an elastic element. The screw rod 7 and the base cylinder 3 are coaxially arranged. A first helical blade 701 is fixedly sleeved on the screw rod 7. The screw rod 7 can rotate around its own axis and slide along its own axis. The screw head 8 is coaxially arranged on the screw rod 7 and is located near the injection port 301, and is rotatably connected to the screw rod 7. Multiple circumferentially spaced elements are arranged on the screw head 8. A first protrusion 801 is attached to the screw head 8 near the screw base 7, and a first retaining ring 802 is fitted onto the end of the screw head 8. A sealing ring 9 is located near the injection port 301 and can be fitted onto the screw head 8. Multiple second protrusions 901 are arranged circumferentially on the end face of the sealing ring 9 facing away from the injection port 301. The second protrusions 901 can be inserted between adjacent first protrusions 801. A first check ring 10 is coaxial with the base cylinder 3 and is movably arranged. The first check ring 10 can form a sealing stop with the first retaining ring 802. The intermediate ring 11 and the first check ring 10 are coaxially arranged and can rotate relative to each other. They are connected to the first check ring 10 through an elastic element. The intermediate ring 11 is located closer to the injection port 301 than the first check ring 10. Multiple third protrusions 1101 are arranged circumferentially on the end face of the intermediate ring 11 facing the injection port 301. The third protrusions 1101 can be inserted between adjacent first protrusions 801 and between adjacent second protrusions 901, and can form a guiding engagement with the first protrusions 801.

[0032] Specifically, in this embodiment, the mold 2 is located on top of the machine base 1; the base cylinder 3 is horizontally placed on top of the machine base 1 and extends in the front-rear direction, located in front of the mold 2; the injection port 301 is opened on the rear end face of the base cylinder 3 to facilitate communication with the molding cavity; the feed hopper 5 is vertically placed on top of the base cylinder 3 and is located near the front end of the base cylinder 3 to ensure that the raw material entering the base cylinder 3 from the feed hopper 5 has a suitable stroke; the screw head 8 is located at the rear end of the screw base 7 to facilitate the molten raw material to be squeezed into the molding cavity through the injection port 301; the sealing ring 9 is located at the rear end of the base cylinder 3, and the sealing ring 9 is detachably connected to the rear end face of the base cylinder 3 by screws, and the inner peripheral wall shape of the sealing ring 9 is similar to that of the screw. The shape of the screw head 8 after the first retaining ring 802 is adapted to fill the space between the screw head 8 and the base cylinder 3 when the screw head 8 is fully inserted into the sealing ring 9. The sealing ring 9 and the screw head 8 are in frictional contact to prevent the screw head 8 from being rotated by the screw base rod 7. The first check ring 10 is tightly attached to the inner circumferential wall of the base cylinder 3. The front end of the intermediate ring 11 is rotatably inserted into the first check ring 10, so that the intermediate ring 11 can rotate relative to the first check ring 10 and move axially synchronously with the first check ring 10. The elastic element is set as a torsion spring 12, which is inserted between the intermediate ring 11 and the first check ring 10, with one end connected to the intermediate ring 11 and the other end connected to the first check ring 10.

[0033] To facilitate a rotatable connection between the screw head 8 and the screw base 7, a protrusion is coaxially and perpendicularly provided on the rear end face of the screw base 7. The protrusion is a T-shaped columnar structure. A mounting hole is coaxially provided on the front end face of the screw head 8. The protrusion is rotatably inserted into the mounting hole during installation.

[0034] To facilitate the sealing and stop cooperation between the first check ring 10 and the first retaining ring 802, the outer peripheral wall of the first retaining ring 802 is set in a conical shape, with the rear end being the small end and the front end being the large end. The inner peripheral wall of the first check ring 10 is also set in a conical shape, with the rear end being the small end and the front end being the large end.

[0035] like Figure 5As shown, the number of first protrusions 801 can be six, and they are evenly arranged circumferentially. The first protrusions 801 extend along the axial direction of the screw base 7 and form a pyramidal structure with pointed ends and a wide middle. The number of second protrusions 901 is set on the front end face of the sealing ring 9, and they can be six, and they are evenly arranged circumferentially. The second protrusions 901 extend along the axial direction of the screw base 7 and form a strip structure with a large rear end and a small front end. The number of third protrusions 1101 is set on the rear end of the intermediate ring 11, and they can be six, and they are evenly arranged circumferentially. The third protrusions 1101 extend along the axial direction of the screw base 7 and form a strip structure with a pointed rear end and a thick front end. In order to facilitate the guiding fit between the third protrusions 1101 and the first protrusions 801, the front end face of the first protrusions 801 is inclined, and the rear end face of the third protrusions 1101 is inclined.

[0036] Optionally, the feed hopper 5 can be configured as a conical structure with the small opening facing downwards and connected to the base cylinder 3, so as to achieve the gathering of raw materials from top to bottom under the guiding action of the conical surface of the feed hopper 5, thereby improving the feeding efficiency.

[0037] Initially, the switch valve 4 is in the closed state; the first protrusion 801 is located between the adjacent second protrusion 901; the third protrusion 1101 and the first protrusion 801 are circumferentially offset, and a channel is formed between the adjacent first protrusion 801, second protrusion 901 and third protrusion 1101. The channel connects the space between the injection port 301 and the first check ring 10 and the first retaining ring 802 to ensure normal material conveying. The front end face of the first protrusion 801 and the rear end face of the third protrusion 1101 are in contact, and the torsion spring 12 is in a stored state.

[0038] During operation, the raw material is first fed into the feed hopper 5, and then the screw base 7 is driven to rotate around its own axis. The screw base 7 simultaneously drives the first spiral blade 701 to rotate, thereby receiving the raw material in the feed hopper 5 while moving the raw material from front to back, realizing the directional conveying of the raw material. At the same time, the heat source is turned on. Under the heating of the heat source and the shearing and pushing action of the first spiral blade 701, the raw material gradually changes from solid to liquid, realizing the melting of the raw material. Under the push of the first spiral blade 701, the liquid raw material then enters the space between the screw head 8 and the base cylinder 3 through the gap between the screw head 8 and the first check ring 10, and finally enters the injection port 301, completing the preparation work before injection molding.

[0039] Then, stop the rotation of the screw base 7. While moving the screw base 7 along its own axis from front to back, open the switch valve 4 to allow the liquid raw material to enter the molding cavity through the switch valve 4. During the movement of the screw base 7, the screw base 7 synchronously drives the screw head 8 to move, and the screw head 8 synchronously drives the first retaining ring 802 to move. As the screw base 7 moves, the first retaining ring 802 and the first check ring 10 form a sealing stop to close the space between the screw head 8 and the base cylinder 3. Torsion spring 1 2. Simultaneously released, the intermediate ring 11 rotates relative to the first check ring 10, so that the front end face of the first protrusion 801 and the rear end face of the third protrusion 1101 remain in contact until the first protrusion 801 and the third protrusion 1101 correspond circumferentially; as the screw base rod 7 continues to move, the first retaining ring 802 simultaneously drives the first check ring 10 and the intermediate ring 11 to move backward together, simultaneously squeezing the liquid raw material through the injection port 301 and the switching valve 4 to inject it into the molding cavity for injection molding.

[0040] When the screw base 7 moves to its limit position, the first protrusion 801 and the third protrusion 1101 are fully inserted between the adjacent second protrusion 901, as shown below. Figure 4 As shown, at this time, the sealing ring 9, the first protrusion 801, the second protrusion 901, the third protrusion 1101, the intermediate ring 11 and the first check ring 10 form a complete columnar structure, which can completely fill the space between the screw head 8 and the base cylinder 3, so that no material will be stored between the first check ring 10 and the screw head 8, thereby avoiding the phenomenon of material stagnation.

[0041] After injection molding, the screw base 7 moves from back to front, and the screw base 7 simultaneously drives the screw head 8 to move. Under the constraint of the groove structure between adjacent second protrusions 901, the first protrusion 801, through the inclined surface cooperation with the third protrusion 1101, simultaneously drives the first check ring 10 and the intermediate ring 11 to move forward. The first protrusion 801 and the third protrusion 1101 gradually disengage from the groove structure between adjacent second protrusions 901. When the third protrusion 1101 completely disengages from the groove structure between adjacent second protrusions 901, the first check ring 10 moves to its initial position. As the screw base 7 continues to move, the friction between the first check ring 10 and the inner peripheral wall of the base cylinder 3... In the following steps, the first check ring 10 and the intermediate ring 11 remain stationary, and a gap appears between the first stop ring 802 and the first check ring 10, ensuring normal subsequent material conveying. With the inclined surface cooperation between the first protrusion 801 and the third protrusion 1101, the third protrusion 1101 drives the intermediate ring 11 to rotate relative to the first check ring 10. The torsion spring 12 stores force, and the third protrusion 1101 and the first protrusion 801 gradually shift circumferentially to achieve reset. After reset, a channel is formed between the adjacent first protrusion 801, second protrusion 901 and third protrusion 1101. The channel connects the injection port 301 with the space between the first check ring 10 and the first stop ring 802, ensuring normal material conveying.

[0042] In some embodiments, to improve the quality of the injection-molded product, a second helical blade 702 and a second retaining ring 703 are sleeved on the screw base 7. The second helical blade 702 is positioned closer to the injection port 301 than the first helical blade 701, and the second retaining ring 703 is located between the second helical blade 702 and the first helical blade 701. A second check ring 13 is also coaxially and movably inserted into the base cylinder 3. The second check ring 13 can form a stop engagement with the second helical blade 702 and a sealing stop engagement with the second retaining ring 703. The injection molding device for producing sound insulation cotton also includes a supercritical fluid injection system, which is configured to inject SCF into the base cylinder 3 to achieve mixing of SCF and raw materials.

[0043] Specifically, in this embodiment, the second check ring 13 and the inner circumferential wall of the base cylinder 3 are in close contact; in order to facilitate the second check ring 13 to form a sealing stop with the second stop ring 703, an annular conical surface is provided at the junction of the front end face and the inner circumferential wall of the second check ring 13, with the rear end being the small end and the front end being the large end. Correspondingly, an annular conical surface is provided at the junction of the rear end face and the circumferential side wall of the second stop ring 703, with the rear end being the small end and the front end being the large end.

[0044] During operation, when the liquid raw material moves to the second helical blade 702, the rotation of the screw base 7 stops, and then the screw base 7 moves from front to back. As the screw base 7 moves, the second retaining ring 703 first forms a sealing stop with the second check ring 13, thereby disconnecting the communication between the chambers of the base cylinder 3 before and after the second check ring 13. Then, driven by the second retaining ring 703, the second check ring 13 moves backward synchronously to a preset position. Then, SCF is injected into the base cylinder 3 through the supercritical fluid injection system, and then the screw base 7 rotates. The screw base 7 synchronously drives the second helical blade 702 to rotate, so as to fully mix the SCF and the molten material. Then the above injection molding process is repeated. After the mixture of SCF and molten material is injected into the molding cavity, the molding cavity is quickly opened to a certain distance to complete the growth and molding of the gas core inside the mixture of SCF and molten material. After cooling and solidification, the final molded product is formed. While ensuring that the product wall thickness can be greatly increased, the product quality is guaranteed to be consistent with that before the mold is opened, the rigidity of the part is increased, and the product weight is greatly reduced.

[0045] When the screw base rod 7 moves from back to front, the second check ring 13 first disengages from the second stop ring 703, making the chambers of the base cylinder 3 before and after the second check ring 13 connected. The second check ring 13 then forms a stop engagement with the second helical blade 702 and moves synchronously with the second helical blade 702 to the initial position, thus achieving reset.

[0046] Furthermore, the supercritical fluid injection system is configured to include a gas storage cylinder, an SCF controller, an SCF interface assembly, and an SCF pump head 14 connected in sequence. The gas storage cylinder stores nitrogen or oxygen. The SCF pump head 14 is mounted on the base cylinder 3 and communicates with the base cylinder 3, and is correspondingly mounted to the second helical blade 702.

[0047] Specifically, the gas storage cylinder is connected to the inlet of the SCF controller via a high-pressure pipeline. This high-pressure pipeline can withstand the pressure of the gas inside the gas storage cylinder, ensuring stable gas delivery to the SCF controller. The outlet of the SCF controller is connected to the inlet of the SCF interface component via another high-pressure pipeline. The SCF interface component can further process and adapt the gas. Its outlet is tightly connected to the inlet of the SCF pump head 14 via a connecting pipe. This connecting pipe has good sealing and high pressure resistance to ensure stable transmission of supercritical fluid. The SCF pump head 14 is located between the mold 2 and the feed hopper 5, and is correspondingly arranged with the second helical blade 702. It is mounted on the base 1 via a bracket to ensure that SCF can be input into the second helical blade 702.

[0048] During use, the nitrogen or oxygen stored in the gas cylinder is under a certain pressure and is transported to the SCF controller through a high-pressure pipeline. The SCF controller precisely controls the gas, including adjusting parameters such as gas pressure and flow rate, to make it meet the requirements of supercritical state. After being processed by the SCF controller, the gas enters the SCF interface component, which further adapts and processes the gas, such as performing filtration and pressure stabilization, to ensure the quality and stability of the supercritical fluid delivered to the SCF pump head 14.

[0049] Subsequently, the treated supercritical fluid enters the SCF air pump head 14 through the connecting pipeline, and enters the area inside the base cylinder 3 corresponding to the second helical blade 702 from the air outlet of the SCF air pump head 14. Inside the base cylinder 3, the second helical blade 702 performs operations such as conveying and stirring the raw material, and the supercritical fluid fully contacts and mixes with the raw material in this area. Due to the special physicochemical properties of the supercritical fluid, it can have a positive impact on the performance of the raw material, such as improving the flowability and dispersibility of the raw material.

[0050] The raw material continues to be conveyed towards the mold 2 under the action of the second helical blade 702. During this process, the supercritical fluid and the raw material continue to interact, and finally the raw material is formed in the mold 2, completing the entire processing process.

[0051] In other embodiments, to improve the mixing effect of SCF and raw materials, the second helical blade 702 is configured with multiple sub-blades, with adjacent sub-blades spaced apart. Thus, when the second helical blade 702 rotates, the raw material is conveyed axially along the base cylinder 3 under the push of the sub-blades. During this process, due to the spacing between adjacent sub-blades, the SCF can flow more freely and efficiently through these intervals. On the one hand, the shearing force and stirring effect generated when the sub-blades rotate cause the raw material to form different flow velocity regions and vortices in the axial direction. The SCF can utilize these flow velocity differences and vortices to penetrate deeper into the raw material, achieving sufficient axial exchange with it. On the other hand, the spacing allows the SCF more opportunities to contact the raw material at different locations, breaking the mixing blind spots that may exist in traditional continuous helical blades, greatly increasing the contact area and contact frequency between the SCF and the raw material, thereby improving the mixing effect of SCF and the raw material and improving the performance of the injection molded product.

[0052] Furthermore, to further improve the mixing effect of SCF and raw materials, the blades are staggered along the axial direction of the screw base 7 at the gaps between adjacent blades. Thus, when the second helical blade 702 rotates, the raw material is conveyed axially along the base cylinder 3 under the push of the blades. During this process, because the gaps between adjacent blades are staggered, the flow path of SCF after entering the base cylinder 3 becomes more complex and diverse, forming fluid micro-clusters with different directions and velocities. These fluid micro-clusters interact strongly with the axially moving raw material, enabling more thorough and efficient exchange and mixing of SCF and raw materials in both the axial and radial directions. This further improves the mixing effect of SCF and raw materials, and further enhances the performance of the injection molded product.

[0053] In other embodiments, the heat source is configured to include a power supply and multiple thermal resistance rings 601. The power supply is located on the base 1, and all thermal resistance rings 601 are electrically connected. The thermal resistance rings 601 are sleeved on the base cylinder 3, and the multiple thermal resistance rings 601 are arranged at intervals along the axial direction of the base cylinder 3.

[0054] Specifically, in this embodiment, the number of thermal resistance rings 601 can be set to four, such as... Figure 3 As shown, four thermal resistance rings 601 are arranged at intervals along the axial direction of the base cylinder 3 to facilitate uniform heating of the base cylinder 3.

[0055] During use, the power supply is turned on, and the power supply flows current into the four thermal resistance rings 601 respectively. Since the thermal resistance rings 601 have certain resistance characteristics, when the current passes through the thermal resistance rings 601, the current does work and generates heat in the thermal resistance rings 601, thereby heating the base cylinder 3 and thus heating the raw materials.

[0056] In other embodiments, the injection molding apparatus for producing sound insulation cotton is configured to further include a drive assembly, which is configured to provide a driving force for the screw base 7 to slide along its own axis.

[0057] Specifically, in this embodiment, the drive assembly includes a hydraulic cylinder 15, a piston ring 16, and a hydraulic pump. The hydraulic cylinder 15 is located on the top of the base 1 and near the front end of the base cylinder 3. A hydraulic chamber is formed inside the hydraulic cylinder 15, and the screw rod 7 penetrates the hydraulic chamber during installation. The piston ring 16 is fixedly sleeved on the screw rod 7 and located near the front end of the screw rod 7, and is sealed and slidably inserted into the hydraulic chamber. The piston ring 16 divides the hydraulic chamber into a front chamber and a rear chamber that are not interconnected. The hydraulic pump is located on the base 1 and is connected to both the front and rear chambers to facilitate the filling of hydraulic oil into the front and rear chambers respectively.

[0058] During use, when the screw base rod 7 needs to move from front to back, the hydraulic pump is started, and the hydraulic pump delivers hydraulic oil to the front chamber. Under the action of hydraulic pressure, the piston ring 16 moves from front to back, synchronously driving the screw base rod 7 to move from front to back. When the screw base rod 7 needs to move from back to front, the hydraulic pump is started, and the hydraulic pump delivers hydraulic oil to the rear chamber. Under the action of hydraulic pressure, the piston ring 16 moves from back to front, synchronously driving the screw base rod 7 to move from back to front.

[0059] In other embodiments, the injection molding apparatus for producing sound insulation cotton is configured to further include a drive member, which is configured to provide a driving force for rotating the screw base 7 about its own axis.

[0060] Specifically, in this embodiment, the driving component is a hollow motor 17, which is located at the front end of the hydraulic cylinder 15. The hollow shaft of the hollow motor 17 is sleeved on the screw base rod 7 and forms a spline fit with the screw base rod 7, so that it can both drive the screw base rod 7 to rotate and move axially relative to the screw base rod 7.

[0061] In some other embodiments, to facilitate the collection of injection-molded finished products, a receiving box 18 is also provided on the machine base 1, and the receiving box 18 is located below the mold 2.

[0062] Specifically, in this embodiment, such as Figure 1 As shown, a notch is provided on the top of the base 1, and the position of the notch corresponds to the mold 2; the receiving box 18 is inserted into the notch and is open at the top to receive the injection molded products falling from the mold 2.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above embodiments are merely illustrative of several implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. An injection molding device for producing sound insulation cotton, characterized in that, The injection molding device for producing sound insulation cotton includes a base, on which a mold and a base cylinder are mounted. The mold contains a molding cavity, and one end of the base cylinder has an injection port connected to the molding cavity. A switch valve is located at the injection port. A feed hopper and a heat source are mounted on the base cylinder. The feed hopper is connected to the base cylinder, located away from the injection port, and is used to store raw materials. The heat source is used to heat the raw materials inside the base cylinder. A screw rod, screw head, sealing ring, first check ring, intermediate ring, and elastic element are inserted into the base cylinder. The screw rod and base cylinder are coaxially mounted. A first helical blade is fixedly fitted onto the screw rod. The screw rod can rotate around its own axis and slide along its own axis. The screw head is coaxially mounted on the screw rod, located near the injection port, and rotatably connected to the screw rod. Multiple helical blades are spaced apart circumferentially on the screw head. The first protrusion has a first retaining ring fitted onto the end of the screw head near the screw base. A sealing ring is positioned near the injection port and can be fitted onto the screw head. Multiple second protrusions are spaced circumferentially on the end face of the sealing ring facing away from the injection port, and the second protrusions can be inserted between adjacent first protrusions. A first check ring is coaxial with the base cylinder and is movably positioned, and the first check ring can form a sealing stop with the first retaining ring. An intermediate ring is coaxial with the first check ring and can be rotatably positioned relative to it. It is connected to the first check ring through an elastic element. The intermediate ring is positioned closer to the injection port than the first check ring. Multiple third protrusions are spaced circumferentially on the end face of the intermediate ring facing the injection port. The third protrusions can be inserted between adjacent first protrusions and adjacent second protrusions, and can form a guiding fit with the first protrusions.

2. The injection molding device for producing sound insulation cotton according to claim 1, characterized in that, The screw base is also fitted with a second helical blade and a second retaining ring. The second helical blade is positioned closer to the injection port than the first helical blade, and the second retaining ring is located between the second helical blade and the first helical blade. A second check ring is also coaxially and movably inserted inside the base cylinder. The second check ring can form a stop engagement with the second helical blade and a sealing stop engagement with the second retaining ring. The injection molding device for producing sound insulation cotton also includes a supercritical fluid injection system. The supercritical fluid injection system is configured to inject SCF into the base cylinder to achieve mixing of SCF and raw materials.

3. The injection molding device for producing sound insulation cotton according to claim 2, characterized in that, The supercritical fluid injection system includes a gas storage cylinder, an SCF controller, an SCF interface assembly, and an SCF pump head connected in sequence. The gas storage cylinder stores nitrogen or oxygen. The SCF pump head is mounted on the base cylinder and communicates with the base cylinder, and is correspondingly positioned with the second helical blade.

4. The injection molding device for producing sound insulation cotton according to claim 2, characterized in that, The second helical blade has multiple sub-blades, with adjacent sub-blades spaced apart.

5. The injection molding device for producing sound insulation cotton according to claim 4, characterized in that, Along the axial direction of the screw base, the gaps between adjacent blades are staggered.

6. The injection molding device for producing sound insulation cotton according to claim 1, characterized in that, The elastic element is a torsion spring.

7. The injection molding device for producing sound insulation cotton according to claim 1, characterized in that, The heat source includes a power supply and multiple thermal resistance rings. The power supply is located on the base, and all the thermal resistance rings are electrically connected. The thermal resistance rings are fitted onto the base cylinder, and the multiple thermal resistance rings are arranged at intervals along the axial direction of the base cylinder.

8. The injection molding device for producing sound insulation cotton according to claim 1, characterized in that, The injection molding device for producing sound insulation cotton also includes a drive assembly configured to provide a driving force for the screw base to slide along its own axis.

9. The injection molding device for producing sound insulation cotton according to claim 1, characterized in that, The injection molding device for producing sound insulation cotton also includes a drive unit configured to provide a driving force for the screw base to rotate about its own axis.

10. The injection molding device for producing sound insulation cotton according to claim 1, characterized in that, The machine base is also equipped with a receiving box, which is located below the mold.

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