A plastic cone integrated forming device for car audio

Abstract

This invention discloses an integrated molding device for plastic cones in car audio systems, relating to the field of cone injection molding technology. It includes a fixed mold, a moving mold, and a split mold ring. The fixed mold has a cone cavity and an edge cavity sequentially formed from the inside out. The split mold ring is composed of several arc rods and can be inserted into annular groove one and annular groove two. An upper mold ring that can be raised and lowered is located inside annular groove one, and an electromagnet is located inside the upper mold ring to attract the split mold ring. A lower mold ring that can be raised and lowered is located inside annular groove two. This invention uses a mold with two injection cavities, one for injection molding the plastic cone body and the other for injection molding the rubber edge. The connection between the plastic cone body and the rubber edge is a wrap-around design, meaning the rubber edge is wrapped around the plastic cone, ensuring a seamless connection between the cone body and the rubber edge, improving the quality of the integrated injection molding and increasing the connection strength of the rubber edge.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sound cone injection molding, in particular to a plastic sound cone integrated forming device for vehicle-mounted audio. BACKGROUND

[0002] With the rapid development of the automotive industry and the increasing demand of consumers for car entertainment systems, car audio systems have become an indispensable part of modern cars. Car audio not only needs to provide high-quality sound effects, but also needs to have good durability and anti-interference. As one of the important components of the sound system, the sound cone plays a crucial role in sound quality and sound effect. The main function of the sound cone is to carry the vibrating unit of the loudspeaker and ensure the propagation of sound. The traditional car audio sound cone mainly uses metal and paper materials, but with the development of plastic technology, plastic sound cone has gradually become a more common choice in car audio. Plastic sound cone not only has light weight and low cost, but also can improve sound quality through reasonable design and optimization, especially in the low-frequency response performance.

[0003] In Chinese patent application CN107053597A, an integrated sound cone mold is disclosed, which includes an upper mold, a lower mold, an upper mold driving mechanism, a demolding ejector rod, and an ejector rod driving mechanism. The upper mold and the lower mold are arranged oppositely, the upper mold is installed on the guide column through the guide hole and can slide up and down along the guide column, the lower mold is provided with a top rod hole, the demolding ejector rod is installed in the top rod hole, and the lower end of the demolding ejector rod is connected with the power output end of the ejector rod driving mechanism.

[0004] The above patent application and the prior art have the following technical problems in actual use:

[0005] Although the above patent application is also integrated injection molding, it uses a single material for integrated injection molding. During the assembly process of the car audio, the sound cone needs to be connected with the outer frame of the loudspeaker through the elastic rubber edge, which forms an elastic support and plays a role in absorbing vibration and reducing resonance. However, the elastic rubber edge is usually bonded to the sound cone by glue, and the bonding strength of the rubber edge and the plastic sound cone may fluctuate in different batches of production. Especially in mass production, environmental factors such as temperature and humidity and the work difference of the operators may cause the bonding strength to be unstable. The unstable bonding strength will affect the overall performance of the sound cone, especially in high-intensity use, the sound cone is prone to fall off or damage. SUMMARY

[0006] The purpose of the present application is to solve the above problems, and the present application provides a plastic sound cone integrated forming device for vehicle-mounted audio.

[0007] In order to achieve the above purpose, the present application specifically adopts the following technical scheme:

[0008] A plastic sound basin integrated forming device for car audio, comprising a fixed die and a movable die, further comprising a split die ring, the inside of the fixed die is sequentially provided with a sound basin fixed die cavity and an edge fixed die cavity from inside to outside, an annular groove one is provided between the sound basin fixed die cavity and the edge fixed die cavity, a mold core is arranged in the middle of the sound basin fixed die cavity, the bottom of the fixed die is provided with a sound basin injection hole and an edge injection hole, the sound basin injection hole is in communication with the sound basin fixed die cavity, and the edge injection hole is in communication with the edge fixed die cavity;

[0009] The inside of the movable die is sequentially provided with a sound basin movable die cavity and an edge movable die cavity from inside to outside, an annular groove two is provided between the sound basin movable die cavity and the edge movable die cavity, a positioning hole is provided in the inside of the sound basin movable die cavity, when the sound basin is injected, the edge fixed die cavity and the edge movable die cavity are tightly attached, and the mold core is tightly inserted into the positioning hole;

[0010] The split die ring is spliced by a plurality of arc rods, the split die ring can be inserted into the annular groove one and the annular groove two, the inside of the annular groove two is provided with a movable upper die ring, the inside of the upper die ring is provided with an electromagnet, the inside of the arc rod is provided with a permanent magnet, the inside of the annular groove one is provided with a movable lower die ring, the bottom surface of the split die ring is provided with a gradual inclined surface one, and the top of the lower die ring is provided with a gradual inclined surface two.

[0011] Further, the bottom surface of the upper die ring is provided with a protrusion one.

[0012] Further, the top surface of the split die ring is provided with a protrusion two, and the protrusion two is arranged in a staggered manner with the protrusion one.

[0013] Further, the mold core is composed of a cone part and a cylindrical part, and the cone part can be tightly inserted into the positioning hole.

[0014] Further, the top of the movable die and the bottom of the fixed die are provided with a lifting assembly, the lifting assembly comprises a transmission ring, a gas cylinder two is fixedly installed on the transmission ring, a plurality of sliding rods are annularly arranged on the outside of the transmission ring, the fixed die and the movable die are connected with the telescopic ends of the corresponding gas cylinder two, the sliding rods on the top of the movable die penetrate through the annular groove two and are connected with the upper die ring, and the sliding rods on the bottom of the fixed die penetrate through the annular groove one and are connected with the lower die ring.

[0015] Further, a plurality of supports are annularly installed on the outside of the fixed die, the number of the supports is the same as that of the arc rods, a gas cylinder one is fixedly installed on the outside of the support, an arc-shaped magnet is fixedly installed on the telescopic end of the gas cylinder one, and the arc-shaped magnet can adsorb the arc rod and has a height less than that of the arc rod.

[0016] Further, the inner diameter of the arc-shaped magnet is the same as the outer diameter of the arc rod.

[0017] Further, the outer side of the edge fixed mold cavity is provided with a sealing groove, the outer side of the edge movable mold cavity is provided with a sealing convex ring, the sealing convex ring is tightly inserted in the sealing groove, and the depth of the sealing groove is greater than the thickness of the sound cone body and the sound cone edge.

[0018] Further, the sound cone injection hole is provided in a Y shape.

[0019] Further, the inner sides of the fixed mold and the movable mold are both provided with cooling holes.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] 1. The mold with two injection cavities is adopted, the injection cavity composed of the sound cone fixed mold cavity and the sound cone movable mold cavity is used for injection molding of the plastic sound cone body, the injection cavity composed of the edge fixed mold cavity and the edge movable mold cavity is used for injection molding of the rubber edge, and the split mold ring is used in cooperation with the upper mold ring and the lower mold ring respectively, so that the connection is designed as a covered edge, that is, the plastic sound cone body forms a basic shape in the mold, and the rubber edge part and the plastic sound cone part are covered together, which ensures that the sound cone body and the rubber edge can be seamlessly combined, guarantees the quality of integrated injection molding, and improves the stability of the connection strength of the rubber edge and the plastic sound cone and the consistency of the sound cone quality.

[0022] 2. The lower mold ring is provided, which not only can realize injection molding of the two injection cavities respectively, but also can play a role of annular ejector, so as to realize rapid demolding of the sound cone, and the demolding stability is high and the structure is compact.

[0023] 3. The mold core of the present application adopts a two-section design of a cone part and a cylindrical part, which not only can play a guiding role in clamping, but also can prevent the sound cone from being excessively extruded in the injection molding of the rubber edge in the injection cavity composed of the sound cone fixed mold cavity and the sound cone movable mold cavity, so as to improve the sound cone forming quality. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a three-dimensional structure schematic diagram of the present application;

[0025] Figure 2 is an exploded view of the present application;

[0026] Figure 3 is a structure schematic diagram of the fixed mold of the present application;

[0027] Figure 4 is a structure schematic diagram of the movable mold of the present application;

[0028] Figure 5 is a structure schematic diagram of the upper mold ring of the present application;

[0029] Figure 6 is a sectional structure schematic diagram of the split mold ring of the present application;

[0030] Figure 7 This is a cross-sectional view of the lower mold ring of the present invention;

[0031] Figure 8 This is a schematic diagram of the injection molding process of the cone body of the present invention;

[0032] Figure 9 This is a schematic diagram of the rubber edge injection molding process of the present invention;

[0033] Figure 10 This is a schematic diagram of the integrated cone three-dimensional structure of the present invention;

[0034] Figure 11 This is a partial cross-sectional view of the integrated cone structure of the present invention.

[0035] In the diagram: 1. Fixed mold; 11. Fixed cavity of the cone; 12. Fixed cavity of the edge; 13. Ring groove one; 14. Conical part; 15. Cylindrical part; 16. Injection hole of the cone; 17. Injection hole of the edge; 18. Mold core; 2. Moving mold; 21. Moving cavity of the cone; 22. Moving cavity of the edge; 23. Ring groove two; 24. Positioning hole; 3. Upper mold ring; 31. Protrusion one; 4. Split mold ring; 41. Protrusion two; 42. Gradient slope one; 5. Lower mold ring; 51. Gradient slope two; 6. Support; 61. Cylinder one; 62. Arc magnet; 7. Transmission ring; 71. Cylinder two; 72. Slide rod; 8. Cooling hole; 9. Cone body; 91. Cone edge; 10. Rubber edge. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0037] Example

[0038] like Figures 1-11 As shown, a plastic diaphragm molding device for car audio includes a fixed mold 1, a movable mold 2, and a split mold ring 4. The fixed mold 1 has a diaphragm fixed mold cavity 11 and an edge fixed mold cavity 12 sequentially formed from the inside to the outside. An annular groove 13 is formed between the diaphragm fixed mold cavity 11 and the edge fixed mold cavity 12. A mold core 18 is provided in the middle of the diaphragm fixed mold cavity 11. The bottom of the fixed mold 1 has a diaphragm injection hole 16 and an edge injection hole 17. The diaphragm injection hole 16 is connected to the diaphragm fixed mold cavity 11, and the edge injection hole 17 is connected to the edge fixed mold cavity 12.

[0039] The inside of the movable mold 2 is sequentially provided with a cone movable mold cavity 21 and a rim movable mold cavity 22 from inside to outside, and a ring groove two 23 is arranged between the cone movable mold cavity 21 and the rim movable mold cavity 22; the inside of the cone movable mold cavity 21 is provided with a positioning hole 24; when the cone is injection molded, the rim fixed mold cavity 12 and the rim movable mold cavity 22 are tightly combined, and the mold core 18 is tightly inserted into the positioning hole 24;

[0040] The split mold ring 4 is spliced by a plurality of arc rods, the split mold ring 4 can be inserted into the ring groove one 13 and the ring groove two 23, the inside of the ring groove two 23 is provided with a movable upper mold ring 3, the inside of the upper mold ring 3 is provided with an electromagnet, the inside of the arc rod is provided with a permanent magnet, the inside of the ring groove one 13 is provided with a movable lower mold ring 5, the bottom surface of the split mold ring 4 is provided with a gradual inclined surface one 42, and the top of the lower mold ring 5 is provided with a gradual inclined surface two 51.

[0041] The top of the movable mold 2 and the bottom of the fixed mold 1 are provided with a lifting assembly, the lifting assembly comprises a transmission ring 7, a gas cylinder two 71 is fixedly installed on the transmission ring 7, and a plurality of sliding rods 72 are annularly arranged on the outer side of the transmission ring 7; the fixed mold 1 and the movable mold 2 are respectively connected with the telescopic ends of the corresponding gas cylinder two 71, the sliding rod 72 at the top of the movable mold 2 penetrates through the ring groove two 23 and is connected with the upper mold ring 3, and the sliding rod 72 at the bottom of the fixed mold 1 penetrates through the ring groove one 13 and is connected with the lower mold ring 5.

[0042] A plurality of supports 6 are annularly installed on the outside of the fixed mold 1, the number of the supports 6 is same as that of the arc rods, a gas cylinder one 61 is fixedly installed on the outside of the support 6, an arc-shaped magnet 62 is fixedly installed at the telescopic end of the gas cylinder one 61, the arc-shaped magnet 62 can adsorb the arc rod and the height thereof is less than that of the arc rod. The inner diameter of the arc-shaped magnet 62 is same as the outer diameter of the arc rod. Cooling holes 8 are arranged in the inside of the fixed mold 1 and the movable mold 2.

[0043] The use process of the present application is as follows:

[0044] The cone body 9 is injection molded: the movable mold 2 and the fixed mold 1 are combined, the cone fixed mold cavity 11 and the cone movable mold cavity 21 form a cone injection cavity (as shown in Figure 8 At this time, the split mold ring 4 is located in the ring groove one 13, an injection distance is formed between the top end of the split mold ring 4 and the bottom end of the upper mold ring 3, the injection distance is integrated with the cone injection cavity, the rim fixed mold cavity 12 and the rim movable mold cavity 22 are tightly combined and form a plugging edge, and the inside abutting position of the rim fixed mold cavity 12 and the rim movable mold cavity 22 is just slightly lower than the cone injection cavity, so as to prevent the plastic from flowing out from the abutting position of the rim fixed mold cavity 12 and the rim movable mold cavity 22, improve the cone body injection quality, then the molten plastic is injected through the cone injection hole 16 and fills out the shape of the cone body 9, and the top end of the split mold ring 4 and the bottom end of the upper mold ring 3 are the cone edge 91.

[0045] After injection molding, the plastic part cools and solidifies, but still maintains a certain temperature to ensure that it will not fall off when it is subsequently bonded to the rubber edge 10.

[0046] Injection molding of rubber edge 10: First, the moving mold 2 moves away from the fixed mold 1, and then the cylinder 71 below the fixed mold 1 is controlled to run. At this time, the initial state of the extension end of the cylinder 71 is the extended state. Since the extension end of the cylinder 71 is fixedly installed at the bottom of the fixed mold 1, the position of the fixed mold 1 remains relatively unchanged. Therefore, when the cylinder 71 retracts, it can drive the transmission ring 7 to approach the fixed mold 1. The transmission ring 7 drives the lower mold ring 5 to rise along the ring groove 13 through the corresponding slide rod 72. The lower mold ring 5 drives the split mold ring 4 to rise. The split mold ring 4 drives the diaphragm body 9 to rise through the diaphragm edge 91.

[0047] When the split mold ring 4 is disengaged from the ring groove 13 and the cone body 9 is not disengaged from the mold core 18, the cylinder 61 operates. The cylinder 61 drives the arc magnet 62 to approach the split mold ring 4. The magnetic attraction between the arc magnet 62 and the arc rod is greater than the magnetic attraction between adjacent arc rods. Therefore, the cylinder 61 can drive the corresponding arc rod to move through the arc magnet 62, thereby causing several arc rods to separate and disengage from the cone body 9. The cone body 9 falls onto the lower mold ring 5 under the action of gravity.

[0048] Then, cylinder 61, through arc magnet 62, causes several arc rods to close again and form a split mold ring 4, which is located above the edge 91 of the diaphragm. Next, cylinder 71 above the moving mold 2 is controlled to operate. At this time, the initial state of the extension end of cylinder 71 is the retracted state. Since the extension end of cylinder 71 is fixedly installed on the top of the moving mold 2, the position of the moving mold 2 remains relatively unchanged. Therefore, when cylinder 71 extends, it can drive the corresponding transmission ring 7 away from the moving mold 2. The transmission ring 7 drives the upper mold ring 3 to slide upward along the annular groove 23 through the corresponding slide rod 72. Then, the moving mold 2 is controlled to approach the fixed mold 1 and the top of the split mold ring 4 is inserted into the annular groove 23. Then, cylinder 61 is controlled to operate, and cylinder 61 drives arc magnet 62 to disengage from the corresponding arc rod. The moving mold 2 is then controlled to approach the fixed mold 1 until the split mold ring 4 is pressed above the edge 91 of the diaphragm and completely closed. The lower mold ring 5 is inserted into the second ring groove 23 and rests below the edge 91 of the cone. At this time, a rubber injection cavity is formed between the fixed mold cavity 12 and the moving mold cavity 22. The cylinder 71 above the moving mold 2 applies downward pressure to the split mold ring 4 through the upper mold ring 3, and the cylinder 71 below the fixed mold 1 applies upward force to the lower mold ring 5. This makes the split mold ring 4 and the lower mold ring 5 tightly clamped on the edge 91 of the cone at the same time, realizing the separation of the rubber injection cavity and the cone injection cavity. Then, rubber is injected into the rubber injection cavity through the edge injection hole 17. Under pressure, the rubber is tightly bonded to the edge 91 of the cone. The rubber edge 10 wraps around the edge 91 of the cone. Then, through the setting of the first gradient slope 42 and the second gradient slope 51, the connection between the cone body 9 and the rubber edge 10 is gradually set, making the connection smoother and avoiding the need for manual trimming or grinding of the joint in the traditional design.

[0049] Demolding: During demolding, the electromagnet in the upper mold ring 3 is energized, allowing the split mold ring 4 to adhere to it. As the moving mold 2 separates from the fixed mold 1, the split mold ring 4 moves away from the integrated cone. Subsequently, the lower mold ring 5 is raised to eject the cone, thus demolding the cone. When injection molding is performed again after demolding, the moving mold 2 closes with the fixed mold 1 again, the electromagnet is de-energized, and the split mold ring 4 falls into the ring groove 13, separating from the upper mold ring 3.

[0050] This invention achieves fully automated processing without human intervention, resulting in high injection molding efficiency and quality.

[0051] In one embodiment of the present invention, the bottom surface of the upper mold ring 3 is provided with a protrusion 31. The top surface of the split mold ring 4 is provided with a protrusion 41, which is offset from the protrusion 31.

[0052] By setting protrusion 2 41 and protrusion 1 31, a groove can be generated in the wrapping part when the cone body 9 is injection molded, so that when the rubber edge 10 is subsequently wrapped and injection molded, the rubber edge 10 and the cone edge 91 are more firmly connected. Furthermore, by setting protrusion 2 41 and protrusion 1 31 in a staggered manner, the top of the split mold ring 4 and the bottom of the upper mold ring 3 can fit tightly together, and the split mold ring 4 can be stably attracted when the electromagnet is energized.

[0053] As an embodiment of the present invention, the mold core 18 is composed of a conical portion 14 and a cylindrical portion 15, wherein the conical portion 14 can be tightly inserted into the positioning hole 24.

[0054] During injection molding of the cone body 9, the cone portion 14 can be tightly inserted into the positioning hole 24, and the cylindrical portion 15 forms the edge of the cone injection cavity. After the cone body 9 is injection molded, the cone portion 14 does not contact the inner wall of the cone. When the split mold ring 4 detaches from the cone body 9, the cone body 9 can fall automatically. The cone portion 14 and the positioning hole 24 provide stable guidance without affecting the automatic falling of the cone body 9.

[0055] As an embodiment of the present invention, a sealing groove is provided on the outer side of the fixed mold cavity 12, and a sealing protrusion is provided on the outer side of the moving mold cavity 22. The sealing protrusion is tightly inserted into the sealing groove, and the depth of the sealing groove is greater than the sum of the thickness of the cone body 9 and the cone edge 91.

[0056] The design of the sealing groove and sealing ring can improve the mold sealing performance and enable stable injection molding of the rubber edge 10.

[0057] As one embodiment of the present invention, the injection hole 16 of the cone is Y-shaped to improve the uniformity of injection molding.

[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A one-piece molding device for a plastic cone for a car audio system, comprising a fixed mold (1) and a movable mold (2), characterized in that, It also includes a split mold ring (4). The interior of the fixed mold (1) is provided with a diaphragm fixed mold cavity (11) and an edge fixed mold cavity (12) from the inside to the outside. An annular groove (13) is provided between the diaphragm fixed mold cavity (11) and the edge fixed mold cavity (12). A mold core is provided in the middle of the diaphragm fixed mold cavity (11). The bottom of the fixed mold (1) is provided with a diaphragm injection hole (16) and an edge injection hole (17). The diaphragm injection hole (16) is connected to the diaphragm fixed mold cavity (11), and the edge injection hole (17) is connected to the edge fixed mold cavity (12). The moving mold (2) has a diaphragm moving mold cavity (21) and an edge moving mold cavity (22) sequentially opened from the inside to the outside. An annular groove (23) is opened between the diaphragm moving mold cavity (21) and the edge moving mold cavity (22). A positioning hole (24) is opened inside the diaphragm moving mold cavity (21). When the diaphragm is injected, the edge fixed mold cavity (12) and the edge moving mold cavity (22) are tightly fitted together, and the mold core is tightly inserted into the positioning hole (24). The split mold ring (4) is made up of several arc rods. The split mold ring (4) can be inserted into the first ring groove (13) and the second ring groove (23). The second ring groove (23) is equipped with a lifting upper mold ring (3). The upper mold ring (3) is equipped with an electromagnet. The arc rod is equipped with a permanent magnet. The first ring groove (13) is equipped with a lifting lower mold ring (5). The bottom surface of the split mold ring (4) is equipped with a gradient slope one (42). The top surface of the lower mold ring (5) is equipped with a gradient slope two (51). Lifting components are provided at the top of the moving mold (2) and the bottom of the fixed mold (1). The lifting components include a transmission ring (7), on which a cylinder (71) is fixedly installed. Several sliding rods (72) are arranged in a ring on the outer side of the transmission ring (7). The fixed mold (1) and the moving mold (2) are respectively connected to the telescopic ends of the corresponding cylinders (71). The sliding rods (72) at the top of the moving mold (2) pass through the ring groove (23) and are connected to the upper mold ring (3). The sliding rods (72) at the bottom of the fixed mold (1) pass through the ring groove (13) and are connected to the lower mold ring (5). The outer side of the fixed mold (1) is arranged in a ring. There are several supports (6), the number of supports (6) is the same as the number of arc rods. A cylinder (61) is fixedly installed on the outside of the support (6). An arc magnet (62) is fixedly installed on the telescopic end of the cylinder (61). The arc magnet (62) can attract the arc rod and its height is less than the height of the arc rod. The inner diameter of the arc magnet (62) is the same as the outer diameter of the arc rod. A diaphragm injection cavity is formed between the fixed mold cavity (11) and the moving mold cavity (21). The inner side of the fixed mold cavity (12) and the moving mold cavity (22) is slightly lower than the diaphragm injection cavity. The magnetic attraction between the arc magnet (62) and the arc rod is greater than the magnetic attraction between adjacent arc rods.

2. The integrated molding device for a plastic cone in a car audio system according to claim 1, characterized in that, The bottom surface of the upper mold ring (3) is provided with a protrusion (31).

3. The integrated molding device for a plastic cone in a car audio system according to claim 2, characterized in that, The top surface of the split mold ring (4) is provided with a second protrusion (41), which is offset from the first protrusion (31).

4. The integrated molding device for a plastic cone in a car audio system according to claim 1, characterized in that, The mold core is composed of a conical part (14) and a cylindrical part (15), and the conical part (14) can be tightly inserted into the positioning hole (24).

5. The integrated molding device for a plastic cone in a car audio system according to claim 1, characterized in that, A sealing groove is provided on the outer side of the fixed edge mold cavity (12), and a sealing protrusion is provided on the outer side of the moving edge mold cavity (22). The sealing protrusion is tightly inserted into the sealing groove, and the depth of the sealing groove is greater than the sum of the thickness of the diaphragm and the edge of the diaphragm.

6. The integrated molding device for a plastic cone in a car audio system according to claim 1, characterized in that, The cone injection hole (16) is Y-shaped.

7. A one-piece molding device for a plastic cone for a car audio system according to any one of claims 1-6, characterized in that, Cooling holes (8) are provided inside both the fixed mold (1) and the moving mold (2).

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