A horn net injection mold ejection mechanism

Abstract

This invention provides an ejection mechanism for a speaker grille injection mold, belonging to the field of injection molding technology for automotive plastic interior parts. The ejection mechanism of this speaker grille injection mold includes a lower mold plate, a speaker grille forming insert, a side plate, and a bottom plate. A molding cavity is formed on the upper surface of the lower mold plate. The speaker grille forming insert is embedded and fixed within the molding cavity. A mounting plate is fixed to the upper end of a lifting plate. A lifting groove is formed on the lower end face of the lower mold plate. A support plate is fixed at the opening of the lifting groove. A drive plate and an ejector plate are provided within the lifting groove. The ejector plate is fixed to the upper end of the drive plate. Several linkage rods connect the lifting plate and the ejector plate. A spring is provided between the drive plate and the support plate to push the ejector plate upward. Ejector pins and ejector plates are fixed on the ejector plate, passing through the speaker grille forming insert and contacting the molding cavity. Due to the spring, drive plate, and linkage rods, the spring's extension force acts on the ejector pins and ejector plates, resulting in smooth ejection, uniform force distribution, and reduced risk of product damage.

Description

Technical Field

[0001] This invention belongs to the field of injection molding technology for automotive plastic interior parts, and relates to an ejection mechanism for a speaker grille injection mold, which is particularly suitable for the smooth ejection and molding protection of fine mesh plastic speaker grilles. Background Technology

[0002] The inner panel of a car door is made of plastic. To accommodate the layout of a car audio system, a fine mesh speaker grille needs to be integrally molded onto the inner panel. Traditional speaker grilles are made of metal and require bolts for assembly to the inner panel, resulting in numerous processes, high costs, poor assembly precision, and a tendency to produce abnormal noises. Currently, the industry commonly uses an integral injection molding process for plastic speaker grilles and inner door panels. However, the fine mesh ribs and weak structure of the speaker grille lead to significant technical defects in the ejection process after injection molding: using a large-diameter ejector rod can easily cause direct cracking and deformation of the fine mesh; using a small-diameter ejector rod results in concentrated force during ejection, which can lead to bending and breakage of the ejector rod, affecting the mold's lifespan; furthermore, uneven force distribution from a single ejector rod can cause ejection marks and warping in the product, reducing the appearance and assembly quality of the automotive interior parts.

[0003] To address the aforementioned issues, existing ejection mechanisms lack specific solutions and cannot simultaneously ensure the ejection protection of the fine mesh and the rigidity and stability of the ejection structure, thus hindering the production yield and efficiency of integrated injection molding of automotive horn mesh. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by providing an ejection mechanism for a speaker grille injection mold that features smooth ejection, uniform force distribution, minimal product damage, and durable ejection components.

[0005] The objective of this invention can be achieved through the following technical solution: An ejection mechanism for a speaker mesh injection mold, comprising a lower template, a speaker mesh forming insert, side plates, and a bottom plate, characterized in that a forming cavity is formed on the upper surface of the lower template, the speaker mesh forming insert is embedded and fixed in the forming cavity, a lifting plate and a mounting plate are provided between the two side plates, the mounting plate is fixed on the upper end of the lifting plate, a guide post is fixed on the bottom plate, a lifting groove is formed on the lower end face of the lower template, a support plate is fixed at the opening of the lifting groove, the support plate abuts against the upper end of the guide post, a drive plate and a top plate are provided in the lifting groove, the top plate is fixed on the upper end of the drive plate, several linkage rods are connected between the lifting plate and the top plate, a spring that can push the top plate upward is provided between the drive plate and the support plate, and ejector pins and ejector plates are fixed on the top plate, the ejector pins and ejector plates pass through the speaker mesh forming insert and contact the forming cavity.

[0006] Furthermore, a guide rod is fixed on the support plate, a spring is sleeved on the guide rod, a sliding sleeve is fixedly inserted on the top plate, the guide rod is inserted into the sliding sleeve, and the upper end of the spring abuts against the sliding sleeve.

[0007] Furthermore, the ejector pin includes a cylindrical rod and a needle tip, the outer diameter of which is smaller than that of the rod.

[0008] Furthermore, the needle is positioned to abut against the grid intersection of the speaker grille molding insert.

[0009] Furthermore, the top plate includes a cylindrical shaft and a plate-shaped head.

[0010] Furthermore, the top of the pole head is provided with a step, the surface of which is in close contact with the bottom surface of the rib of the horn mesh. This step is provided to increase the width of the pole head and prevent it from bending under pressure when lifted.

[0011] Furthermore, the upper end of the linkage rod has a horizontally extended stop, the upper surface of the drive plate has a circular groove for the stop to be inserted, the lower end of the linkage rod is fixed with a pad by bolts, and the bottom plate has a through hole for the pad to slide vertically.

[0012] Furthermore, the ejector pins and ejector plates are arranged in a matrix and staggered with each other.

[0013] The hydraulic press drives the upper and lower mold plates to close, injecting molten plastic into the molding cavity. After cooling and solidification, the mold opens, the upper and lower mold plates separate, and the piston rod of the ejector cylinder extends into the base plate, pushing the lifting plate upward. The mounting plate moves synchronously with the lifting plate, and the drive plate and ejector plate also move synchronously. Because the upper end of the linkage pulls the drive plate and the lower end pulls the lifting plate, the spring is forced to compress. When the lower lifting plate rises, the spring extends and lifts the sliding sleeve, causing the drive plate and ejector plate to rise. This drives the ejector pins and ejector plates to push the inner plate's horn mesh away from the horn mesh molding insert. After being lifted 20mm, the spring extends to its maximum height, and its own extension force is no longer enough to push the horn mesh. However, the lifting plate continues to rise, and other ejector rods will lift the rest of the inner plate, causing the entire inner plate to completely detach from the lower mold plate.

[0014] Compared with existing technologies, the ejection mechanism of this speaker grille injection mold has the following advantages: 1. Uniform ejection force, protecting the fine mesh; adopting a combination of ejector pins and ejector plates, the ejector pins act on the mesh intersections (the parts with the strongest force), and the ejector plates provide large-area support along the mesh ribs, dispersing the ejection pressure and preventing the fine mesh from breaking or deforming, leaving no ejection marks.

[0015] 2. The ejection structure is durable and not easily bent or damaged. It adopts a segmented ejection structure. Since the drive of the ejector plate is determined only by the spring's extension strength, the ejector plate of the speaker grille only needs to move upwards by 20mm. Therefore, the ejector pins and ejector plates can be made shorter, improving their strength. Due to the inclusion of a drive plate and linkage rod, the later stages of the lifting plate and mounting plate's travel do not affect the movement of the ejector plate.

[0016] 3. Smooth and stable ejection: The linkage rod enables synchronous transmission between the lifting plate and the ejector plate, and the spring provides elastic ejection force. After mold opening, the ejection action is responsive and runs smoothly, and the product is demolded smoothly, improving injection molding production efficiency and product yield. Attached Figure Description

[0017] Figure 1 This is the injection mold for this speaker grille.

[0018] Figure 2 This is a structural diagram of the template.

[0019] Figure 3 yes Figure 2 A sectional view.

[0020] Figure 4 This is a three-dimensional structural diagram of the ejection mechanism.

[0021] Figure 5 This is a cross-sectional structural diagram of the ejection mechanism.

[0022] Figure 6 This is an assembly diagram of the drive board and the support board.

[0023] Figure 7 This is a schematic diagram of the three-dimensional structure of the driver board.

[0024] Figure 8 This is a cross-sectional view of the driver board.

[0025] Figure 9 This is a schematic diagram of the structure of the speaker grille molding insert.

[0026] Figure 10 This is the inner plate product of this mold.

[0027] Figure 11 This is a structural diagram of the ejector pin and ejector plate.

[0028] In the diagram, 1. Lower template; 2. Horn mesh forming insert; 3. Side plate; 4. Base plate; 5. Lifting plate; 6. Mounting plate; 7. Guide column; 8. Lifting groove; 9. Support plate; 10. Drive plate; 101. Circular groove; 11. Top plate; 12. Linkage rod; 121. Stop block; 122. Pad block; 13. Spring; 14. Ejector pin; 141. Circular rod part; 142. Needle head; 15. Top piece; 151. Rod body; 152. Rod head; 153. Step; 16. Guide rod; 17. Sliding sleeve; 18. Through hole; 19. Forming cavity. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] like Figure 10 The image shows the inner panel of a car door manufactured using this injection mold. The inner panel includes a speaker grille. Figure 1-6 As shown, the ejection mechanism of this speaker grille injection mold includes a lower mold plate 1, a speaker grille forming insert 2, a side plate 3, and a bottom plate 4. A forming cavity 19 is formed on the upper surface of the lower mold plate 1. Figure 9 As shown, the speaker mesh forming insert 2 is fixedly embedded in the forming cavity 19. A lifting plate 5 and a mounting plate 6 are provided between the two side plates 3. The mounting plate 6 is fixed to the upper end of the lifting plate 5. A guide post 7 is fixed on the bottom plate 4. The guide post 7 passes through the lifting plate 5 and the mounting plate 6. A lifting groove 8 is opened on the lower end face of the lower template 1. A support plate 9 is fixed at the groove opening of the lifting groove 8. The support plate 9 abuts against the upper end of the guide post 7. A drive plate 10 and a top plate 11 are provided in the lifting groove 8. The top plate 11 is fixed to the upper end of the drive plate 10. Several linkage rods 12 are connected between the lifting plate 5 and the top plate 11. A spring 13 that can push the top plate 11 upward is provided between the drive plate 10 and the support plate 9. A ejector pin 14 and a top piece 15 are fixed on the top plate 11. The ejector pin 14 and the top piece 15 pass through the speaker mesh forming insert 2 and contact the forming cavity 19.

[0031] like Figure 7 As shown, a guide rod 16 is fixed on the support plate 9, a spring 13 is sleeved on the guide rod 16, a sliding sleeve 17 is fixedly inserted on the top plate 11, the guide rod 16 is inserted into the sliding sleeve 17, and the upper end of the spring 13 abuts against the sliding sleeve 17.

[0032] like Figure 11 As shown, the ejector pin 14 includes a cylindrical rod portion 141 and a needle head 142, the outer diameter of which is smaller than that of the rod portion 141. The needle head 142 abuts against the grid intersection of the speaker grille molding insert 2.

[0033] The top plate 15 includes a cylindrical rod body 151 and a plate-shaped rod head 152. The top of the rod head 152 has a step 153, and the surface of the step 153 is in close contact with the bottom surface of the rib of the speaker mesh. In order to increase the width of the rod head 152 and prevent the rod head 152 from bending under pressure when lifted, the step 153 is provided to contact the speaker mesh. The pins 14 and the top plate 15 are both arranged in a matrix and staggered with each other.

[0034] like Figure 8 As shown, the upper end of the linkage rod 12 has a horizontally extended stop 121, the upper surface of the drive plate 10 has a circular groove 101 for the stop 121 to be inserted, the lower end of the linkage rod 12 is fixed with a pad 122 by bolts, and the bottom plate 4 has a through hole 18 for the pad 122 to slide vertically.

[0035] Working process: The hydraulic press drives the upper and lower mold plates 1 to close, injecting molten plastic into the molding cavity 19. After cooling and solidification, the mold opens, the upper and lower mold plates 1 separate, the piston rod of the ejector cylinder extends into the base plate 4, pushing the lifting plate 5 to rise. The mounting plate 6 and the lifting plate 5 move synchronously along the guide column 7. The drive plate 10 and the ejector plate 11 also move synchronously. Since the upper end of the linkage rod 12 pulls the drive plate 10 and the lower end pulls the lifting plate 5, the spring 13 is forced to compress. After the lower lifting plate 5 rises, the spring 13 extends and lifts the sliding sleeve 17, causing the drive plate 10 and the ejector plate 11 to rise. This drives the ejector pin 14 and the ejector plate 15 to push the inner plate's horn mesh away from the horn mesh molding insert 2. After being lifted 20mm, the spring 13 extends to its maximum height, and its own extension force can no longer push the horn mesh. However, the lifting plate 5 continues to rise, and the other ejector rods will lift the rest of the inner plate, causing the entire inner plate to completely detach from the lower mold plate 1. After the inner plate product smoothly leaves the molding cavity 19, the mold closes, the piston rod of the ejector cylinder descends, the lifting plate 5 moves down, the linkage rod 12 pulls the drive plate 10 down, the spring 13 is compressed, the ejector pin 14 and the ejector plate 15 are reset, waiting for the next injection.

[0036] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An ejection mechanism for a speaker grille injection mold, comprising a lower template (1), a speaker grille forming insert (2), a side plate (3), and a bottom plate (4), characterized in that, The upper surface of the lower template (1) has a forming cavity (19). The speaker mesh forming insert (2) is embedded and fixed in the forming cavity (19). A lifting plate (5) and a mounting plate (6) are provided between the two side plates (3). The mounting plate (6) is fixed to the upper end of the lifting plate (5). A guide post (7) is fixed on the bottom plate (4). The lower end face of the lower template (1) has a lifting groove (8). A support plate (9) is fixed at the opening of the lifting groove (8). The support plate (9) abuts against the upper end of the guide post (7). The lifting groove (8) is provided with There is a drive plate (10) and a top plate (11). The top plate (11) is fixed on the upper end of the drive plate (10). Several linkage rods (12) are connected between the lifting plate (5) and the top plate (11). A spring (13) that can push the top plate (11) upward is provided between the drive plate (10) and the support plate (9). A ejector pin (14) and a top piece (15) are fixed on the top plate (11). The ejector pin (14) and the top piece (15) pass through the speaker mesh forming insert (2) and contact the forming cavity (19).

2. The ejection mechanism of a speaker grille injection mold according to claim 1, characterized in that, A guide rod (16) is fixed on the support plate (9), a spring (13) is sleeved on the guide rod (16), a sliding sleeve (17) is fixedly inserted on the top plate (11), the guide rod (16) is inserted into the sliding sleeve (17), and the upper end of the spring (13) abuts against the sliding sleeve (17).

3. The ejection mechanism of a speaker grille injection mold according to claim 1, characterized in that, The ejector pin (14) includes a cylindrical rod (141) and a needle (142), the outer diameter of which is smaller than that of the rod (141).

4. The ejection mechanism of a speaker grille injection mold according to claim 3, characterized in that, The needle (142) is positioned at the intersection of the mesh of the speaker mesh molding insert (2).

5. The ejection mechanism of a speaker grille injection mold according to claim 3, characterized in that, The top plate (15) includes a cylindrical shaft (151) and a plate-shaped head (152).

6. The ejection mechanism of a speaker grille injection mold according to claim 5, characterized in that, The top of the pole head (152) is provided with a step (153), and the surface of the step (153) is in contact with the bottom surface of the horn mesh reinforcement strip.

7. The ejection mechanism of a speaker grille injection mold according to claim 1, characterized in that, The upper end of the linkage rod (12) has a horizontally unfolded stop (121), the upper surface of the drive plate (10) has a circular groove (101) for the stop (121) to be embedded, the lower end of the linkage rod (12) is fixed with a pad (122) by bolts, and the bottom plate (4) has a through hole (18) for the pad (122) to slide vertically.

8. The ejection mechanism of a speaker grille injection mold according to claim 6, characterized in that, The pin (14) and the top piece (15) are arranged in a matrix and are staggered with each other.

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