Injection mold for back plate of automobile seat

Abstract

The utility model relates to the technical field of injection molds, and discloses an automobile seat back plate injection mold which comprises a lower mold and an upper mold, the top of the lower mold is fixedly connected with a guide rod, the inner wall of the lower mold penetrates through and is slidably connected with an ejector pin, a loosening mechanism is arranged in the lower mold, a discharging mechanism is arranged at the top of the lower mold, and the loosening mechanism comprises an I-shaped wheel. The spool is fixedly connected to the bottom end of the ejector pin, the top of the spool is fixedly connected with a spring, the inner wall of the spool penetrates through and is rotationally connected with a rotating rod, one end of the rotating rod is fixedly connected with a reed, one end, away from the rotating rod, of the reed is fixedly connected with a steel ball, and the other end of the rotating rod is fixedly connected with a gear. According to the utility model, through the arrangement of the loosening mechanism, the ejector pin can generate high-frequency micro-amplitude vibration before the ejector pin jacks a product, so that the molecular adsorption force between the product and the top end of the ejector pin is damaged, the product adhesion is effectively prevented, the demolding quality of the product can be improved, and the production yield of the product is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold for an automotive seat back panel. Background Technology

[0002] Injection molds are key tools used in industrial production for mass manufacturing of plastic products. They typically consist of an upper mold, a lower mold, a mold cavity, a gating system, and an ejection mechanism. Their working principle is to inject molten plastic into the mold cavity, where it cools and solidifies to form the desired product shape.

[0003] In the injection molding production of car seat back panels, the product needs to be demolded from the lower mold after molding. Currently, most injection molds commonly use the ejector mechanism built into the lower mold to eject the solidified back panel out of the mold cavity by moving the ejector pins upward.

[0004] During the injection molding process, the plastic softened by high temperature is prone to physical adsorption to the tip of the ejector pin, causing the molded product to adhere to the end of the ejector pin after demolding. This makes demolding inconvenient. If brute force is used to separate them, it may leave scratches on the product surface that are difficult to repair, or even cause structural deformation or excessively deep ejector pin marks, resulting in defective products. The occurrence of such defective products not only greatly increases the cost of rework and repair, but also significantly reduces the overall production yield. Therefore, an injection mold for automotive seat back panels is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an injection mold for an automotive seat back panel, which aims to improve the problem mentioned in the prior art that "when the ejector pin ejects the product, the product is easily stuck to the top of the ejector pin, causing inconvenience for product demolding".

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an injection mold for an automotive seat back panel, comprising a lower mold and an upper mold, wherein a guide rod is fixedly connected to the top of the lower mold, an ejector pin is slidably connected through the inner wall of the lower mold, a loosening mechanism is provided inside the lower mold, and a feeding mechanism is provided at the top of the lower mold;

[0007] The loosening mechanism includes an H-beam wheel, which is fixedly connected to the bottom end of the ejector pin. A spring is fixedly connected to the top of the H-beam wheel. A rotating rod is rotatably connected through the inner wall of the H-beam wheel. A spring plate is fixedly connected to one end of the rotating rod. A steel ball is fixedly connected to the end of the spring plate away from the rotating rod. A gear is fixedly connected to the other end of the rotating rod. A cylinder is fixedly connected to the inner wall of the lower mold. A top plate is fixedly connected to the piston end of the cylinder. A rack that meshes with the gear is fixedly connected to the upper surface of the top plate.

[0008] As a further description of the above technical solution:

[0009] The feeding mechanism includes a push plate, and a slide rod is fixedly connected to the bottom of the push plate. The slide rod is slidably connected to the top side wall of the lower mold.

[0010] As a further description of the above technical solution:

[0011] A handle is fixedly connected to the end of the slide bar away from the push plate.

[0012] As a further description of the above technical solution:

[0013] The spring is sleeved on the outer wall of the ejector pin, and the top end of the spring is fixedly connected to the top of the inner wall of the lower mold.

[0014] As a further description of the above technical solution:

[0015] The steel ball is located inside the I-beam and fits against the inner wall of the I-beam.

[0016] As a further description of the above technical solution:

[0017] The top plate is slidably connected to the inner wall of the lower mold.

[0018] As a further description of the above technical solution:

[0019] The push plate is located on the right side of the lower mold, and the handle is located on the left side of the lower mold.

[0020] As a further description of the above technical solution:

[0021] The upper mold is slidably connected to the outer wall of the guide rod.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, by setting up a loosening mechanism, the product can be made to vibrate at a high frequency and a small amplitude before the ejector pin lifts the product, so as to break the molecular adsorption force between the product and the tip of the ejector pin, effectively prevent the product from sticking, and thus improve the demolding quality of the product and increase the product production yield.

[0024] 2. In this utility model, by pulling the sliding rod with the handle, the push plate can be moved above the lower mold. After the ejector pin completely ejects the molded product from the cavity of the lower mold, the movement of the push plate can completely push the product that has been lifted to the demolding position by the ejector pin away from the working area of ​​the lower mold, so that the product can be safely removed from the mold closing space between the upper mold and the lower mold, avoiding the operational risks of manually removing the part directly. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a side view of the cross-sectional structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the overall structure of the feeding mechanism of this utility model;

[0028] Figure 4 This utility model Figure 2 A magnified structural diagram at point A.

[0029] Legend:

[0030] 1. Lower mold; 2. Upper mold; 3. Guide rod; 4. Ejector pin; 5. Loosening mechanism; 51. I-beam wheel; 52. Spring; 53. Rotating rod; 54. Spring leaf; 55. Steel ball; 56. Gear; 57. Cylinder; 58. Top plate; 59. Rack; 6. Unloading mechanism; 61. Push plate; 62. Slide rod; 63. Handle. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1-3 The present invention provides an embodiment of an injection mold for an automotive seat back panel, comprising a lower mold 1 and an upper mold 2. A guide rod 3 is fixedly connected to the top of the lower mold 1. The upper mold 2 is slidably connected to the outer wall of the guide rod 3. An ejector pin 4 is slidably connected to the inner wall of the lower mold 1. The ejector pin 4 can be moved upward to lift the product formed in the cavity of the lower mold 1. A loosening mechanism 5 is provided inside the lower mold 1, and a feeding mechanism 6 is provided at the top of the lower mold 1.

[0033] Reference Figure 2 and Figure 4The loosening mechanism 5 includes an I-beam wheel 51, which is fixedly connected to the bottom end of the ejector pin 4. When the steel ball 55 impacts the inner wall of the I-beam wheel 51, the impact force is converted into high-frequency micro-amplitude vibration and transmitted to its top end through the axial direction of the ejector pin 4. A spring 52 is fixedly connected to the top of the I-beam wheel 51, and the spring 52 is sleeved on the outer wall of the ejector pin 4. The top end of the spring 52 is fixedly connected to the top of the inner wall of the lower mold 1. The elasticity of the spring 52 can drive the ejector pin 4 to slide downward and reset. A rotating rod 53 is rotatably connected through the inner wall of the I-beam wheel 51. A spring plate 54 is fixedly connected to one end of the rotating rod 53, and a steel ball 55 is fixedly connected to the end of the spring plate 54 away from the rotating rod 53. When the rotating rod 53 rotates, it can drive the steel ball 55 to make a circular motion around the rotating rod 53 in conjunction with the spring plate 54. The steel ball 55 is located at The steel ball 55, while rotating around the rotating rod 53, periodically impacts the inner wall of the I-beam wheel 51, allowing the I-beam wheel 51 to transmit the impact force to the ejector pin 4. A gear 56 is fixedly connected to the other end of the rotating rod 53. A cylinder 57 is fixedly connected to the inner wall of the lower mold 1. A top plate 58 is fixedly connected to the piston end of the cylinder 57. The top plate 58 is slidably connected to the inner wall of the lower mold 1. When the cylinder 57 is activated, the top plate 58 slides up and down on the inner wall of the lower mold 1. A rack 59 that meshes with the gear 56 is fixedly connected to the upper surface of the top plate 58. When the top plate 58 slides upward, it drives the rack 59 to move upward synchronously. As the rack 59 moves upward, it works with the gear 56 to drive the rotating rod 53 to rotate on the inner wall of the I-beam wheel 51.

[0034] Reference Figures 1-3 The feeding mechanism 6 includes a push plate 61, and a slide rod 62 is fixedly connected to the bottom of the push plate 61. The slide rod 62 drives the push plate 61 to slide, which can completely push the product away from the working area of ​​the lower mold 1. The slide rod 62 is slidably connected to the top side wall of the lower mold 1. A handle 63 is fixedly connected to the end of the slide rod 62 away from the push plate 61. By holding the handle 63 and applying force in the horizontal direction to pull the handle 63, the slide rod 62 can be driven to slide on the top side wall of the lower mold 1. The push plate 61 is located on the right side of the lower mold 1, and the handle 63 is located on the left side of the lower mold 1. The sliding of the slide rod 62 can drive the push plate 61 to move back and forth above the lower mold 1.

[0035] Working principle: When demolding is required after the lower mold 1 has been formed, the cylinder 57 is first activated to drive the top plate 58 to slide upward on the inner wall of the lower mold 1. Simultaneously, the top plate 58 slides upward, driving the rack 59 to move upward. As the rack 59 moves upward, it engages with the gear 56, which in turn drives the rotating rod 53 to rotate on the inner wall of the I-beam wheel 51. While rotating, the rotating rod 53, in conjunction with the spring 54, drives the steel ball 55 to rotate around the rotating rod 53 in a circular motion. During this motion, the steel ball 55 periodically impacts the inner wall of the I-beam wheel 51, each impact generating a momentary impact force. Because the I-beam wheel 51 is rigidly connected to the inner wall... At the bottom of ejector pin 4, these impact forces are converted into high-frequency micro-amplitude vibrations, which are transmitted to the top of ejector pin 4 through its axis, causing ejector pin 4 to vibrate slightly. This breaks the molecular adhesion between the product and the top of ejector pin 4, effectively preventing adhesion and improving the demolding quality of the product. At the same time, when the top plate 58 contacts the bottom of the I-beam wheel 51 during its upward sliding, it pushes the I-beam wheel 51 upward, causing the I-beam wheel 51 to compress the spring 52 and push ejector pin 4 upward. At this time, ejector pin 4 will slide upward on the inner wall of the lower mold 1. By sliding ejector pin 4 upward, the product inside the cavity of the lower mold 1 can be lifted upward, thereby completing the demolding of the product.

[0036] After the ejector pin 4 completely ejects the molded product from the cavity of the lower mold 1, the operator can hold the handle 63 and pull it horizontally. This will cause the slide bar 62 to slide on the top side wall of the lower mold 1. As the slide bar 62 slides, it will also cause the push plate 61 to move synchronously. The movement of the push plate 61 can completely push the product that has been lifted to the demolding position by the ejector pin 4 away from the working area of ​​the lower mold 1, so that the product can be safely removed from the mold closing space between the upper mold 2 and the lower mold 1, thus avoiding the operational risks of manual removal of parts.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An injection mold for an automotive seat back panel, comprising a lower mold (1) and an upper mold (2), characterized in that: The top of the lower mold (1) is fixedly connected to a guide rod (3), the inner wall of the lower mold (1) is slidably connected to an ejector pin (4), the interior of the lower mold (1) is provided with a loosening mechanism (5), and the top of the lower mold (1) is provided with a feeding mechanism (6). The loosening mechanism (5) includes an I-beam wheel (51), which is fixedly connected to the bottom end of the ejector pin (4). A spring (52) is fixedly connected to the top of the I-beam wheel (51). A rotating rod (53) is rotatably connected through the inner wall of the I-beam wheel (51). A spring plate (54) is fixedly connected to one end of the rotating rod (53). A steel ball (55) is fixedly connected to the end of the spring plate (54) away from the rotating rod (53). A gear (56) is fixedly connected to the other end of the rotating rod (53). A cylinder (57) is fixedly connected to the inner wall of the lower mold (1). A top plate (58) is fixedly connected to the piston end of the cylinder (57). A rack (59) that meshes with the gear (56) is fixedly connected to the upper surface of the top plate (58).

2. The injection mold for an automotive seat back panel according to claim 1, characterized in that: The feeding mechanism (6) includes a push plate (61), and a slide rod (62) is fixedly connected to the bottom of the push plate (61). The slide rod (62) is slidably connected to the top side wall of the lower mold (1).

3. The injection mold for an automotive seat back panel according to claim 2, characterized in that: A handle (63) is fixedly connected to the end of the slide bar (62) away from the push plate (61).

4. The injection mold for an automotive seat back panel according to claim 1, characterized in that: The spring (52) is sleeved on the outer wall of the ejector pin (4), and the top end of the spring (52) is fixedly connected to the top of the inner wall of the lower mold (1).

5. The injection mold for an automotive seat back panel according to claim 1, characterized in that: The steel ball (55) is located inside the I-beam (51) and is attached to the inner wall of the I-beam (51).

6. The injection mold for an automotive seat back panel according to claim 1, characterized in that: The top plate (58) is slidably connected to the inner wall of the lower mold (1).

7. The injection mold for an automotive seat back panel according to claim 3, characterized in that: The push plate (61) is located on the right side of the lower mold (1), and the handle (63) is located on the left side of the lower mold (1).

8. The injection mold for an automotive seat back panel according to claim 1, characterized in that: The upper mold (2) is slidably connected to the outer wall of the guide rod (3).

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