Automatic demolding device for injection molding

Abstract

The utility model provides an automatic demoulding device for injection moulding processing, including the forming seat, upper cavity, lower cavity, the inside of forming seat is provided with upper cavity, the inside of forming seat is provided with lower cavity, the top mouth of upper cavity is inserted with the top, the top mouth of upper cavity is conical, the bottom fixedly connected with movable rod of top, the bottom fixedly connected with the float disc of movable rod, the float disc is located in the lower chamber. The utility model has the advantages of: after the airflow passes the side of float disc, goes up, finally exports the bottom surface of the impact product after the direction of the side of top and the direction of the gas guide groove. The uniform pressure of the upward movement of top cooperates with the airflow, which can better demould the product. The design of multiple inclined gas guide grooves guides the gas flow, making the airflow uniformly impact multiple points of the product, eliminating the stress concentration of product demoulding; the airflow penetrates the micro gap of the product bottom surface, quickly balances the demoulding negative pressure. To assist its comprehensive better demoulding.

Description

Technical Field

[0001] This utility model relates to the field of mold demolding technology, and in particular to an automatic demolding device for injection molding. Background Technology

[0002] Injection molding, as a core technology in plastic product manufacturing, is widely used in the automotive, electronics, and medical fields. This process involves injecting molten plastic into a mold cavity, where it cools and solidifies to form the desired shape. Demolding is a crucial step affecting production efficiency and product quality. However, existing demolding technologies still face numerous bottlenecks, necessitating innovative solutions. The limitations of traditional demolding technology and low space efficiency: For long or large injection molded parts, traditional mold opening requires a gap of at least twice the product length to ensure demolding space, resulting in increased mold volume and significant factory space occupation.

[0003] Product damage risk: Mechanical ejection pins or pneumatic ejection methods can easily cause stress concentration, leading to surface indentations, deformation, or internal damage. This is especially problematic for thin-walled parts, miniature parts, or products with high appearance requirements, making it difficult to guarantee a high pass rate.

[0004] Complex structures are difficult to demold: Products with multiple undercut structures require the design of multi-directional core-pulling mechanisms, making the demolding process complex and time-consuming, and the linkage components are prone to jamming, affecting stability.

[0005] While airflow-assisted demolding can reduce mechanical contact, traditional air-blowing technology has significant shortcomings: Uneven airflow distribution: Single-point or disordered airflow impact can easily lead to uneven local stress on the product, causing warping or sticking to the mold, especially for parts with micro-gap structures on the bottom surface (such as parts with textures or grooves). Therefore, an automatic demolding device for injection molding is proposed to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0007] Therefore, one objective of this utility model is to provide an automatic demolding device for injection molding to solve the problems mentioned in the background art and overcome the shortcomings of the prior art.

[0008] To achieve the above objectives, one embodiment of the present invention provides an automatic demolding device for injection molding, including a molding seat, an upper cavity, and a lower cavity, wherein the molding seat has an upper cavity and a lower cavity. The top opening of the upper cavity is plugged with a top head, and the top opening of the upper cavity is conical; A movable rod is fixedly connected to the bottom end of the top head, and a floating disk is fixedly connected to the bottom end of the movable rod. The floating disk is located in the lower cavity, and a gap is left between the floating disk and the inner wall of the lower cavity. A fixing ring is fixedly connected to the top surface of the inner side of the lower cavity, and a spring is fixedly connected between the bottom surface of the fixing ring and the top surface of the floating disk. An electric control valve is fixedly connected to the bottom of the lower cavity, with the output end of the electric control valve facing upwards, and an air inlet pipe is fixedly connected to one side of the electric control valve; The outer surface of the top head is provided with several air guide grooves, which are inclined.

[0009] Preferably, in any of the above embodiments, the lower part of the upper cavity is connected to the lower cavity, and the shape of the top head matches the shape of the top opening of the upper cavity.

[0010] Using the above technical solution: This device is specifically designed for demolding injection-molded products.

[0011] The main feature is air ejection-assisted demolding. The molding base has an upper cavity and a lower cavity, and the top opening of the upper cavity is plugged with an ejector pin.

[0012] When the product needs to be demolded, the electric control valve opens, and high-pressure airflow enters through the air inlet pipe and exits from the outlet of the electric control valve. This pushes the floating plate upward, compresses the spring, and causes the floating plate to drive the movable rod and the mandrel upward. The mandrel pushes the product, and at the same time, the upper chamber opens. The airflow passes through the side of the floating plate and then rises, finally exiting from the side of the mandrel and being guided by the air guide groove before impacting the bottom surface of the product.

[0013] The upward movement of the mandrel, combined with the uniform upward pressure of the airflow, effectively demolds the product. Multiple angled air guide channels direct the gas flow, ensuring it impacts multiple points on the product evenly, eliminating stress concentration during demolding. The airflow penetrates the micro-gaps on the bottom surface of the product, quickly balancing the negative pressure during demolding. This further aids in comprehensive and effective demolding.

[0014] Preferably, in any of the above embodiments, the top surface of the mandrel is initially flush with the top surface of the forming seat, and the movable rod is connected to the mandrel via a flange.

[0015] The above technical solution is adopted: The device consists of: a molding seat: the main structure, which has the following interconnected parts: an upper cavity: the top of which is a conical opening; and a lower cavity: located below the upper cavity, with a diameter larger than that of the upper cavity.

[0016] Top end: Inserted into the conical top opening of the upper cavity, its bottom surface is connected to the movable rod, and multiple oblique air guide grooves are opened on the outer surface (preferably distributed in an array, with the wall surface being arc-shaped). In the initial state, the top surface is flush with the top surface of the forming seat. Movable rod: The top end is fixedly connected to the top end of the top end through a flange, and the bottom end is welded with a floating plate.

[0017] Floating disc: Located in the lower chamber, its diameter is smaller than the inner diameter of the lower chamber, with a gap maintained between its circumference and the chamber wall; its top surface is connected to a fixing ring via a spring. Fixing ring: Welded to the top surface of the inner side of the lower chamber and fixed to the spring. Spring: Sleeve around the movable rod, providing the floating disc with a return force. Electrically controlled valve: Fixed to the bottom of the lower chamber, with the output end facing upwards, and connected to an inlet pipe on one side for inputting high-pressure gas.

[0018] Preferably, in any of the above embodiments, the floating disk is welded to the movable rod, and there are gaps between the movable rod and the inner walls of the upper and lower cavities.

[0019] Preferably, in any of the above embodiments, the floating disk can float up and down inside the lower cavity, and the fixing ring is welded to the spring.

[0020] Preferably, in any of the above embodiments, the spring is located around the movable rod, the air guide grooves are arranged in a plurality of arrays about the axis of the top head, and the wall surface of the air guide grooves is an arc surface.

[0021] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows: This automatic demolding device for injection molding mainly uses air ejector for demolding. The molding base has an upper cavity and a lower cavity, and an ejector head is inserted at the top opening of the upper cavity.

[0022] When the product needs to be demolded, the electric control valve opens, and high-pressure airflow enters through the air inlet pipe and exits from the outlet of the electric control valve. This pushes the floating plate upward, compresses the spring, and causes the floating plate to drive the movable rod and the mandrel upward. The mandrel pushes the product, and at the same time, the upper chamber opens. The airflow passes through the side of the floating plate and then rises, finally exiting from the side of the mandrel and being guided by the air guide groove before impacting the bottom surface of the product.

[0023] The upward movement of the mandrel, combined with the uniform upward pressure of the airflow, effectively demolds the product. Multiple angled air guide channels direct the gas flow, ensuring it impacts multiple points on the product evenly, eliminating stress concentration during demolding. The airflow penetrates the micro-gaps on the bottom surface of the product, quickly balancing the negative pressure during demolding. This facilitates comprehensive and effective demolding while minimizing damage to the workpiece.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a first-view structural diagram of the interior of this utility model; Figure 3 This is a structural schematic diagram of the internal second perspective of this utility model; Figure 4 This is a schematic diagram of the improved top head structure of this utility model.

[0026] In the diagram: 1-forming seat, 2-upper cavity, 3-lower cavity, 4-top, 5-moving rod, 6-floating plate, 7-fixed ring, 8-spring, 9-electric control valve, 10-air inlet pipe, 11-air guide groove. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] like Figure 1-4 As shown, this automatic demolding device for injection molding includes a molding seat 1, an upper cavity 2, and a lower cavity 3. The upper cavity 2 is opened inside the molding seat 1, and the lower cavity 3 is opened inside the molding seat 1. A top head 4 is inserted at the top opening of the upper cavity 2, and the top opening of the upper cavity 2 is conical; A movable rod 5 is fixedly connected to the bottom end of the top head 4, and a floating disk 6 is fixedly connected to the bottom end of the movable rod 5. The floating disk 6 is located in the lower cavity 3, and there is a gap between the floating disk 6 and the inner wall of the lower cavity 3. A fixing ring 7 is fixedly connected to the top surface of the inner side of the lower cavity 3, and a spring 8 is fixedly connected between the bottom surface of the fixing ring 7 and the top surface of the floating disk 6. An electric control valve 9 is fixedly connected to the bottom of the lower chamber 3. The output end of the electric control valve 9 faces upward, and an air inlet pipe 10 is fixedly connected to one side of the electric control valve 9. The outer surface of the top 4 is provided with several air guide grooves 11, which are inclined.

[0030] Example 1: The lower cavity 3 is connected to the upper cavity 2 below, and the shape of the top head 4 matches the top opening shape of the upper cavity 2. Initially, the top surface of the top head 4 is flush with the top surface of the forming seat 1, and the movable rod 5 is connected to the top head 4 via a flange. The floating plate 6 is welded to the movable rod 5, and there are gaps between the movable rod 5 and the inner walls of the upper cavity 2 and the lower cavity 3. The floating plate 6 can float up and down inside the lower cavity 3, and the fixing ring 7 is welded to the spring 8. The spring 8 is located around the movable rod 5, and there are multiple air guide grooves 11 arranged about the axis of the top head 4, with the wall surface of the air guide grooves 11 being arc-shaped.

[0031] Example 2: This device is specifically designed for demolding injection molded products.

[0032] The main function is air ejection to assist in demolding. The molding base 1 has an upper cavity 2 and a lower cavity 3, and the top opening of the upper cavity 2 is plugged with an ejector head 4.

[0033] When the product needs to be demolded, the electric control valve 9 opens, and high-pressure airflow enters through the air inlet pipe 10. The airflow exits from the outlet of the electric control valve 9, pushing the floating plate 6 upwards. The spring 8 is compressed, and the floating plate 6 drives the movable rod 5 and the ejector head 4 upwards. The ejector head 4 pushes the product upwards. Simultaneously, the upper cavity 2 opens, and the airflow passes through the side of the floating plate 6 and rises, finally exiting from the side of the ejector head 4 and being guided by the air guide groove 11 before impacting the bottom surface of the product. Device composition: Molding base 1: The main structure, with interconnected internal openings: Upper cavity 2: The top has a conical opening; Lower cavity 3: Located below the upper cavity 2, with a diameter larger than the upper cavity 2.

[0034] Top head 4: Inserted into the conical top opening of the upper cavity 2, its bottom surface is connected to the movable rod 5, and multiple oblique air guide grooves 11 are opened on the outer surface (preferably distributed in an array, with the wall surface being arc surface). In the initial state, the top surface is flush with the top surface of the forming seat 1. Movable rod 5: The top end is fixedly connected to the top head 4 through a flange, and the bottom end is welded with a floating plate 6.

[0035] Floating disc 6: Located in the lower cavity 3, its diameter is smaller than the inner diameter of the lower cavity 3, and a gap is maintained between its circumference and the cavity wall; its top surface is connected to the fixing ring 7 via a spring 8. Fixing ring 7: Welded to the inner top surface of the lower cavity 3 and fixed to the spring 8. Spring 8: Sleeve around the movable rod 5, providing the floating disc 6 with a return force. Electrically controlled valve 9: Fixed to the bottom of the lower cavity 3, with its output end facing upwards, and connected to the air inlet pipe 10 on one side for inputting high-pressure gas.

[0036] The working principle of this utility model is as follows: Pneumatic drive stage: The electric control valve 9 is opened, and the external air source inputs high-pressure gas through the air inlet pipe 10; the gas is sprayed upward from the output end of the electric control valve 9, pushing the floating disk 6 to move upward along the lower cavity 3; the floating disk 6 compresses the spring 8 and drives the movable rod 5 and the top head 4 to move upward synchronously.

[0037] Mechanical ejection stage: The ejector head 4 moves upward to abut against the bottom surface of the product, providing initial ejection force to separate the product from the inner wall of the upper cavity 2; Airflow-assisted demolding stage: When the floating disk 6 moves upward, high-pressure gas enters the upper cavity 2 from its peripheral gap; the gas moves upward along the upper cavity 2 to the surface of the top head 4, and is turned and sprayed through multiple inclined air guide grooves 11; the inclined arc surface design of the air guide grooves 11 makes the airflow evenly distributed at multiple points on the bottom surface of the product. Synergistic demolding effect: The mechanical lifting force of the ejector 4 releases the mechanical engagement between the product body and the mold; the inclined and guided gas evenly impacts the edge area of ​​the product, eliminating local vacuum adsorption force; the dual action allows the product to completely detach from the molding seat 1 without deformation or damage.

[0038] Reset phase: After demolding is completed, the electric control valve 9 closes, the spring 8 releases its stored energy to push the floating disk 6 to reset; the floating disk 6 drives the movable rod 5 and the top head 4 to move down and return to the initial position.

[0039] Compared with the prior art, the present invention has the following advantages: The automatic demolding device for injection molding is mainly air-assisted demolding. The molding base 1 has an upper cavity 2 and a lower cavity 3, and the top opening of the upper cavity 2 is plugged with an ejector head 4.

[0040] When the product needs to be demolded, the electric control valve 9 opens, and the air inlet pipe 10 inputs high-pressure airflow, which is output from the outlet of the electric control valve 9. This pushes the floating plate 6 upward, compresses the spring 8, and causes the floating plate 6 to drive the movable rod 5 and the ejector head 4 upward. The ejector head 4 pushes the product upward. At the same time, the upper cavity 2 opens, and the airflow passes through the side of the floating plate 6 and rises. Finally, it is output from the side of the ejector head 4 and guided by the air guide groove 11, impacting the bottom surface of the product.

[0041] The upward movement of the mandrel 4, combined with the uniform upward pressure of the airflow, effectively demolds the product. The design of multiple inclined air guide grooves 11 guides the gas flow, ensuring that the airflow evenly impacts multiple points on the product, eliminating stress concentration during demolding. The airflow penetrates the micro-gaps on the bottom surface of the product, quickly balancing the negative pressure during demolding. This assists in comprehensive and effective demolding while minimizing damage to the workpiece.

Claims

1. An automatic demolding device for injection molding, characterized in that, It includes a molding base (1), an upper cavity (2), and a lower cavity (3). The molding base (1) has an upper cavity (2) inside and a lower cavity (3) inside. The top opening of the upper cavity (2) is plugged with a top head (4), and the top opening of the upper cavity (2) is conical; The bottom end of the top head (4) is fixedly connected to a movable rod (5), and the bottom end of the movable rod (5) is fixedly connected to a floating disk (6). The floating disk (6) is located in the lower cavity (3), and there is a gap between the floating disk (6) and the inner wall of the lower cavity (3). A fixing ring (7) is fixedly connected to the top surface of the inner side of the lower cavity (3), and a spring (8) is fixedly connected between the bottom surface of the fixing ring (7) and the top surface of the floating disk (6). An electric control valve (9) is fixedly connected to the bottom of the lower chamber (3), with the output end of the electric control valve (9) facing upwards, and an air inlet pipe (10) is fixedly connected to one side of the electric control valve (9). The outer surface of the top head (4) is provided with a number of air guide grooves (11), and the air guide grooves (11) are oblique.

2. The automatic demolding device for injection molding as described in claim 1, characterized in that: The lower cavity (3) is connected to the lower cavity (2) below the upper cavity (2), and the shape of the top head (4) matches the shape of the top opening of the upper cavity (2).

3. The automatic demolding device for injection molding as described in claim 2, characterized in that: Initially, the top surface of the top head (4) is flush with the top surface of the forming seat (1), and the movable rod (5) is connected to the top head (4) through a flange.

4. The automatic demolding device for injection molding as described in claim 3, characterized in that: The floating disk (6) is welded to the movable rod (5), and there are gaps between the movable rod (5) and the inner wall of the upper cavity (2) and the inner wall of the lower cavity (3).

5. The automatic demolding device for injection molding as described in claim 4, characterized in that: The floating disk (6) can float up and down inside the lower cavity (3), and the fixed ring (7) is welded to the spring (8).

6. The automatic demolding device for injection molding as described in claim 5, characterized in that: The spring (8) is located around the movable rod (5), and there are multiple air guide grooves (11) arranged about the axis of the top head (4). The wall of the air guide groove (11) is an arc surface.

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