Multi-point ejection mechanism based on automobile air duct opening injection molding

Abstract

The utility model discloses a multi-point ejection mechanism based on injection molding of an automobile air duct opening. The multi-point ejection mechanism comprises a base unit, an ejection execution unit, a guide reset unit and a power driving unit, the base unit is provided with a mold mounting base plate and a guide supporting column; the ejection execution unit drives an ejection bearing plate through a bidirectional hydraulic cylinder, ejector pin adjusting modules distributed in a matrix mode are arranged on the ejection bearing plate, and independent adjustment of the height of ejector pins is achieved through thread fit. The guide reset unit ensures stable ejection reset through a guide column assembly and a buffer spring; the power driving unit accurately controls the ejection force and speed through the hydraulic control module. The mechanism can meet the demolding requirement of a complex curved surface mold, avoids product deformation, improves the ejection uniformity and efficiency, and is particularly suitable for production of automobile air duct opening injection molding parts.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to a multi-point ejection mechanism based on automotive air duct injection. Background Technology

[0002] Automotive air ducts are core functional components in automotive air conditioning systems, guiding airflow. Their structures typically feature irregularly shaped thin walls, deep cavities, curved surfaces, and complex internal ribs. With increasing demands for lightweight vehicles and higher interior quality, air duct designs are trending towards thinner walls, greater structural complexity (such as multi-angle branched air ducts), and more stringent appearance standards. These requirements pose significant technical challenges to injection molding processes and place higher demands on automotive air duct injection molds.

[0003] Existing automotive air duct injection molds often encounter the following problems during demolding: the ejection mechanism is generally a single-point ejection, which can easily lead to localized stress concentration in thin-walled parts, causing product deformation or surface dents; when demolding complex air duct structures, the ejection points of the ejection mechanism are insufficient, easily causing demolding difficulties or damage; at the same time, the ejector pin layout of the existing ejection mechanism cannot adapt to multi-angle demolding requirements, and has limitations in dealing with complex situations. These technical defects have seriously restricted the improvement of the yield rate of next-generation automotive air duct products and increased the overall cost per unit. Especially in the field of new energy vehicles, with the popularization of integrated cabin air conditioning systems, the ejection structure of existing molds has shown obvious inadequacy for new air duct products with variable cross-section flow channels and embedded sensor structures.

[0004] Therefore, how to mitigate or at least alleviate the above-mentioned problems or defects by providing new or otherwise improved structures for the ejection mechanisms of automotive air duct injection molds is an urgent problem to be solved. Utility Model Content

[0005] In response to one or more of the above-mentioned defects or improvement needs of the existing technology, this utility model provides a multi-point ejection mechanism based on automotive air duct injection molding, which has the advantage of being able to adapt to the demolding requirements of complex curved surface molds.

[0006] To achieve the above objectives, this utility model provides a multi-point ejection mechanism based on automotive air duct injection molding, which includes:

[0007] The base unit includes a mold mounting base plate and guide pillars located at its four corners;

[0008] The ejection execution unit is composed of an ejection support plate and a support base plate connected by a bidirectional hydraulic cylinder. The bottom surface of the ejection support plate is provided with a matrix-distributed ejector pin adjustment module.

[0009] The ejector pin adjustment module includes:

[0010] An internally threaded mounting sleeve is provided through the ejector plate, and an externally threaded ejector rod that mates with the thread of the mounting sleeve is provided inside.

[0011] Guided reset unit, including:

[0012] The guide post assembly consists of a guide sleeve that passes through the ejector bearing plate, and a guide rod is provided inside the guide sleeve. The upper and lower ends of the guide rod are respectively connected to the support base plate and the mold mounting base plate.

[0013] A buffer reset assembly is disposed between the ejector bearing plate and the support base plate, and includes a reset spring and a base;

[0014] The power drive unit includes:

[0015] The bidirectional hydraulic cylinder has its cylinder body fixed to the support base plate, and the piston rod end is connected to the ejector bearing plate;

[0016] The hydraulic control module is connected to the bidirectional hydraulic cylinder via pipelines.

[0017] As a preferred technical solution, the top end of the external threaded ejector pin is provided with a replaceable contact head, which is made of soft, high-temperature resistant material and has a hemispherical contact surface.

[0018] As a preferred technical solution, the mold mounting base plate is provided with holes corresponding to the ejector pin adjustment modules that are distributed in a matrix.

[0019] As a preferred technical solution, the diameter of the hole is larger than that of the contact head 8.

[0020] As a preferred technical solution, the reset springs are symmetrically distributed between the ejector bearing plate and the support base plate, and the portion connected to the ejector bearing plate and the support base plate is provided with a base.

[0021] As a preferred technical solution, the hydraulic control module is fixedly connected to the support base via a connecting column.

[0022] In summary, the beneficial effects of the above-described technical solutions conceived by this utility model compared with the prior art include:

[0023] This invention relates to a multi-point ejection mechanism for automotive air duct injection molding. By incorporating multiple adjustable ejector pins, it precisely adjusts the pin height to match the demolding requirements of different areas, addressing the asymmetrical curved surface structure of automotive air duct injection molded parts. This avoids the localized stress concentration or product deformation problems caused by fixed pin heights in traditional ejection mechanisms. Furthermore, soft contact heads are provided at the pin ends, allowing for flexible contact with the injection molded part surface during ejection, eliminating the indentation problem of traditional metal ejector pins. This is particularly suitable for automotive interior parts requiring high surface finish, reducing subsequent polishing costs. Spring buffers counteract fluctuations in hydraulic driving force during ejection, reducing rigid collisions between the mold and ejector pins, minimizing the risk of mold surface scratches, and preventing warping or cracking of the product due to uneven instantaneous stress. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an angle structure of the multi-point ejection mechanism based on automotive air duct injection molding of this utility model;

[0025] Figure 2 This is a schematic diagram of another angle of the multi-point ejection mechanism based on automotive air duct injection molding of this utility model;

[0026] Figure 3 This is a front view of the multi-point ejection mechanism based on automotive air duct injection molding according to this utility model;

[0027] Figure 4 for Figure 3 Enlarged view of section A.

[0028] The meanings of the markings in the attached diagram are as follows:

[0029] 100. Base unit; 101. Mold mounting base plate; 102. Guide pillar; 103. Hole; 200. Ejection execution unit; 201. Ejection support plate; 202. Support base plate; 203. Ejector pin adjustment module; 204. Mounting sleeve; 205. Externally threaded ejector pin rod; 206. Contact head; 300. Guide reset unit; 301. Guide pillar assembly; 302. Guide sleeve; 303. Guide rod; 304. Buffer reset assembly; 305. Reset spring; 306. Base; 400. Power drive unit; 401. Two-way hydraulic cylinder; 4011. Cylinder body; 4012. Piston rod; 402. Hydraulic control module; Support base 500. Detailed Implementation

[0030] 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.

[0031] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0032] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0033] In the embodiments, by Figure 1-4 Give, Figure 1 This is a schematic diagram of an angle structure of the multi-point ejection mechanism based on automotive air duct injection molding of this utility model; Figure 2 This is a schematic diagram of another angle of the multi-point ejection mechanism based on automotive air duct injection molding of this utility model; Figure 3 This is a front view of the multi-point ejection mechanism based on automotive air duct injection molding according to this utility model; Figure 4 for Figure 3 Enlarged view of section A. It includes:

[0034] The base unit 100 includes a mold mounting base plate 101 and guide pillars 102 disposed at its four corners;

[0035] The ejection execution unit 200 is composed of an ejection support plate 201 and a support base plate 202 connected by a bidirectional hydraulic cylinder 401. The bottom surface of the ejection support plate 201 is provided with matrix-distributed ejector pin adjustment modules 203.

[0036] The ejector pin adjustment module 203 includes:

[0037] An internally threaded mounting sleeve 204 is provided through the ejector plate 201, and an externally threaded ejector rod 205 that is threadedly engaged with the mounting sleeve 204 is provided inside it.

[0038] Guided reset unit 300, including:

[0039] The guide post assembly 301 consists of a guide sleeve 302 that passes through the ejector bearing plate 201. A guide rod 303 is provided inside the guide sleeve 302. The upper and lower ends of the guide rod 303 are respectively connected to the support base plate 202 and the mold mounting base plate 101.

[0040] A buffer reset assembly 304 is disposed between the ejector bearing plate 201 and the support base plate 202, and includes a reset spring 305 and a base 306.

[0041] The power drive unit 400 includes:

[0042] The bidirectional hydraulic cylinder 401 has a cylinder body 4011 fixed to a support base plate 202, and the piston rod 4012 is connected to an ejector bearing plate 201 at its end.

[0043] The hydraulic control module 402 is connected to the bidirectional hydraulic cylinder 401 via pipelines.

[0044] The top end of the external threaded ejector pin 205 is provided with a replaceable contact head 206, which is made of soft, high-temperature resistant material and has a hemispherical contact surface.

[0045] The mold mounting base plate 101 is provided with holes 103 corresponding to the ejector pin adjustment modules 203 that are arranged in a matrix.

[0046] The diameter of the hole 103 is larger than that of the contact head 208.

[0047] The reset springs 305 are symmetrically distributed between the ejector bearing plate 201 and the support base plate 202, and the portion connected to the ejector bearing plate 201 and the support base plate 202 is provided with a base 306.

[0048] The hydraulic control module 402 is fixedly connected to the support base 500 via a connecting column.

[0049] Working principle of this utility model:

[0050] Mold fixing: The injection mold is mounted on the mold mounting base plate 101 of the base unit 100 via the guide pillar 102. The ejection area of ​​the mold is aligned with the hole 103 on the base plate to ensure that the contact head 206 of the ejector pin adjustment module 203 can pass through the hole 103 to contact the product.

[0051] Ejector height adjustment: Based on the curved shape of the injection molded part, rotate the threaded ejector rod 205 and adjust the extension length of the external threaded ejector rod 205 through thread engagement. For complex curved surfaces, each ejector pin adapts to the surface of the injection molded part by independently adjusting its height difference, so that the matrix-distributed ejector pin tip contact head 206 fits with the inner surface of the mold.

[0052] Ejection trigger and power drive: After the injection molding machine completes the cooling of the injection molded part, when it is time to eject, the signal is transmitted to the hydraulic control module 402 to trigger the ejection command. The hydraulic control module 402 supplies oil to the bidirectional hydraulic cylinder 401, driving the piston rod 4012 to extend upward and push the ejection bearing plate 201 to descend vertically along the guide rod 303.

[0053] Ejection execution and flexible demolding: When the ejector plate 201 descends, the matrix-distributed ejector pin adjustment modules 203 move synchronously until the hemispherical soft surface of the contact head 206 uniformly contacts the surface of the injection molded part. The ejection force is transmitted to each ejector pin through the hydraulic cylinder 401, realizing the separation of the product from the mold. During the ejection process, the return spring 305 is compressed to absorb the instantaneous impact force of the hydraulic cylinder, avoiding rigid collision damage to the mold or product;

[0054] Reset and return to position: After demolding is completed, the hydraulic control module 402 switches the oil circuit, the piston rod 4012 of the bidirectional hydraulic cylinder 401 retracts, driving the ejector bearing plate 201 to rise, and the reset spring 305 of the buffer reset component 304 also releases the compression energy, assisting the ejector bearing plate 201 to quickly reset to the initial position, reducing the load on the hydraulic system.

[0055] In summary, this utility model's multi-point ejection mechanism for automotive air duct injection molding, by setting multiple adjustable ejector pins, can precisely adjust the height of the ejector pins to match the demolding requirements of different areas, especially considering the asymmetrical curved surface structure of automotive air duct injection molded parts. This avoids the problems of localized stress concentration or product deformation caused by the fixed ejector pin height in traditional ejection mechanisms. Simultaneously, a soft contact head is provided at the end of the ejector pin, allowing for flexible contact with the injection molded part surface during ejection, eliminating the indentation problem of traditional metal ejector pins. This is particularly suitable for automotive interior parts requiring high surface finish, reducing the cost of subsequent polishing processes. The spring buffer offsets the fluctuations in hydraulic driving force during ejection, reducing rigid collisions between the mold and ejector pins, minimizing the risk of scratches on the mold surface, and preventing warping or cracking of the product due to uneven instantaneous stress.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-point ejection mechanism based on automotive air duct injection molding, characterized in that: include: The base unit (100) includes a mold mounting base plate (101) and guide pillars (102) located at its four corners. The ejection execution unit (200) is composed of an ejection support plate (201) and a support base plate (202) connected by a bidirectional hydraulic cylinder (401). The bottom surface of the ejection support plate (201) is provided with a matrix-distributed ejector pin adjustment module (203). The ejector pin adjustment module (203) includes: An internally threaded mounting sleeve (204) is provided through the ejector bearing plate (201), and an externally threaded ejector rod (205) that mates with the internal thread of the mounting sleeve (204) is provided inside it. Guided reset unit (300), including: The guide post assembly (301) consists of a guide sleeve (302) that passes through the ejector bearing plate (201). The guide sleeve (302) has a guide rod (303) inside it. The upper and lower ends of the guide rod (303) are connected to the support base plate (202) and the mold mounting base plate (101) respectively. A buffer reset assembly (304) is disposed between the ejector bearing plate (201) and the support base plate (202), and includes a reset spring (305) and a base (306). The power drive unit (400) includes: The bidirectional hydraulic cylinder (401) has its cylinder body (4011) fixed to the support base plate (202), and the piston rod (4012) is connected to the ejector bearing plate (201) at its end. The hydraulic control module (402) is connected to the bidirectional hydraulic cylinder (401) via pipeline.

2. The multi-point ejection mechanism based on automotive air duct injection molding according to claim 1, characterized in that: The top end of the external threaded ejector pin (205) is provided with a replaceable contact head (206), which is made of soft high-temperature resistant material and has a hemispherical contact surface.

3. The multi-point ejection mechanism based on automotive air duct injection molding according to claim 2, characterized in that: The mold mounting base plate (101) is provided with holes (103) corresponding to the ejector pin adjustment module (203).

4. The multi-point ejection mechanism based on automotive air duct injection molding according to claim 3, characterized in that: The diameter of the hole (103) is larger than that of the contact head (206).

5. The multi-point ejection mechanism based on automotive air duct injection molding according to claim 1, characterized in that: The reset spring (305) is symmetrically distributed between the ejector bearing plate (201) and the support base plate (202), and a base (306) is provided on the part that is connected to the ejector bearing plate (201) and the support base plate (202).

6. The multi-point ejection mechanism based on automotive air duct injection molding according to claim 1, characterized in that: The hydraulic control module (402) is fixedly connected to the support base (500) via a connecting column.

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