A resin compression molding apparatus for easy demolding

Abstract

This utility model discloses a resin molding device for easy demolding, including a mold base, a demolding assembly, and an air bladder. The mold base has a molding die on its surface, and a mold cavity is formed on the surface of the molding die. The demolding assembly includes a lifting plate, an inclined ejector rod, and a pusher rod. The lifting plate is slidably installed inside the mold base, and a slide block is fixedly installed on its surface. One end of the inclined ejector rod is slidably connected to the slide block, and the other end is fixedly installed with a die head block located inside the mold cavity. The pusher rod obliquely penetrates the die head block and slidably abuts against the inner wall of the mold cavity. Several air ejector pins are fixedly installed inside the mold base, and the ends of the air ejector pins are connected to the air bladder. Air pressure drives the air ejector pins to extend and retract, achieving synchronous separation of the bottom and sidewalls of the molded part, avoiding sticking and tearing. This structure can simultaneously provide vertical and oblique combined ejection forces during demolding, making the demolding action smooth and reliable, significantly improving the surface quality and demolding efficiency of the molded part, and is suitable for the automated production of various resin molded products.

Description

Technical Field

[0001] This utility model relates to the field of compression molding equipment technology, specifically a resin compression molding device that facilitates demolding. Background Technology

[0002] Currently, in the compression molding process of resin products, the molded parts tend to develop strong adhesion to the inner wall of the mold under heating and pressure, making demolding difficult. Existing molds typically use mechanical ejection structures or spring return mechanisms to eject and separate the molded parts. To avoid damage caused by concentrated local ejection pressure, some molds have large-area block-shaped ejectors or plates at the bottom of the mold cavity. By increasing the force-bearing area, the ejection stress is dispersed, improving the uniformity of ejection. However, after the molded parts cool and shrink, these structures often adhere tightly to the bottom of the parts due to the large surface area of ​​the ejector blocks, easily causing adhesion, increasing ejection resistance, making the demolding process difficult, and even causing scratches or deformation on the surface of the parts.

[0003] In addition, to improve the demolding effect, some solutions incorporate a slanted ejector mechanism on the sidewall of the mold cavity. This mechanism uses slanted ejector blocks or rods to push against the sidewall of the part, assisting in its release. However, traditional slanted ejector structures are mostly rigidly driven or wedge-type mechanical transmissions. Their stroke is fixed and unidirectional, and there is a lack of synchronization between the slanted ejection and the bottom ejection, resulting in uneven distribution of demolding force. This can easily cause one side of the part to detach first while the other side remains attached to the mold wall, leading to twisting, tearing, or cracking.

[0004] Furthermore, some existing molds use a single cylinder or mechanical pusher to provide ejection power. The air pressure transmission path is short and the range of action is limited, making it difficult to apply force to the bottom and sidewalls simultaneously, resulting in limited demolding effectiveness. Especially in complex or deep-cavity resin molds, traditional structures often suffer from incomplete demolding, cumbersome operation, and low efficiency.

[0005] In view of this, this paper studies and improves the existing problems, and provides a resin compression molding device that facilitates demolding to solve the current problems. The aim is to solve the problems and improve the practical value through this technology. Utility Model Content

[0006] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0007] Therefore, the technical solution adopted by this utility model is as follows: a resin molding device for easy demolding, comprising a mold base, a demolding component, and an air bladder. The mold base is used to support and fix the molding die, the demolding component is used to eject and separate the molded part, and the air bladder is used to generate air pressure driving force to drive the air ejector pin and the demolding component to work together to achieve automatic demolding.

[0008] Specifically, a molding die is provided on the surface of the mold base, and a mold cavity is formed on the surface of the molding die. The mold cavity is used to contain resin material and form the target part. The demolding assembly is located inside the mold base and includes a lifting plate, a slide, an angled ejector rod, a mold head block, and a push rod. Each component achieves the angled ejection function through sliding and hinged cooperation. Several air ejector pins are evenly distributed inside the mold base, and their bottom ends are connected to the air bladder. When the air bladder is compressed, the air ejector pins move upward synchronously, pushing the molded part out of the mold cavity.

[0009] In a preferred example, a molding die is provided on the mold base, and a mold cavity is formed on the surface of the molding die. The mold cavity and the mold head block together form a closed molding space for compression molding of the resin material. Specifically, this structure can ensure the accurate shape and dimensional stability of the molded part, and provide a guiding basis for the subsequent demolding action.

[0010] In a preferred example, the demolding assembly includes a lifting plate, an ejector pin, and a pusher pin. The lifting plate is slidably mounted inside the mold base and has a fixed slide block attached to it; one end of the ejector pin is slidably connected to the slide block, and the other end is fixedly connected to the mold head block; the pusher pin obliquely penetrates the mold head block and slidably abuts against the inner wall of the mold cavity. Specifically, this combined structure enables the lifting plate to drive the ejector pin and the pusher pin to form a compound motion when the lifting plate rises, achieving synchronous oblique ejection and bottom lifting of the molded part, resulting in a smooth and stable demolding process.

[0011] In a preferred example, the ejector pin is arranged at an angle, with one end sliding through the molding die, and the other end's head block forming a complete molding groove structure together with the mold cavity. Specifically, this structure ensures uniform resin material filling and precise shape formation during the molding stage, while during the demolding stage, the angled displacement of the ejector pin provides lateral pushing force, effectively assisting the molded part in detaching from the mold cavity sidewall.

[0012] In a preferred example, both the mold cavity surface and the head block surface are machined to a smooth, glossy finish and are provided with an anti-stick coating. Specifically, this structure effectively reduces the adhesion between the molded part and the mold wall, preventing scratches or residues caused by surface adhesion, and improving demolding smoothness and part surface quality.

[0013] In a preferred example, the two ends of the airbag are connected to the opposite surfaces of the forming mold and the lifting plate, respectively. When the lifting plate moves upward, the airbag is compressed and deformed, increasing the internal air pressure. The airflow is transmitted to the ejector pins through the connecting channel, pushing the ejector pins upward synchronously. Specifically, this structure utilizes the compressibility of gas to achieve energy transfer, making the ejection action flexible and controllable, avoiding damage to the workpiece caused by mechanical hard ejection.

[0014] In a preferred example, the ejector pins employ a telescopic cylinder structure, evenly distributed within the mold, with their tips aligned with the mold cavity surface. Specifically, this arrangement ensures uniform force distribution and balanced ejection force distribution on the molded part during demolding, thereby preventing warping or cracking caused by uneven localized stress.

[0015] In a preferred example, the push rod extends obliquely through the mold head block, with a wedge-shaped end that slides against the inner wall of the mold. As the mold head block rises, the push rod slides along the wedge-shaped end against the inner wall, thereby applying an oblique pushing force to the side wall of the molded part. Specifically, this structure achieves synchronized bottom ejection and lateral separation, effectively preventing jamming or surface damage to the molded part.

[0016] In a preferred example, a limiting groove structure is provided between the slide and the lifting plate to limit the lifting stroke of the lifting plate and prevent deviation. Specifically, this limiting structure ensures that the lifting plate maintains a stable linear motion trajectory during air pressure fluctuations or repetitive actions, thereby extending the service life of the device and improving the repeatability accuracy of the demolding action.

[0017] The beneficial effects achieved by this utility model are as follows:

[0018] 1. In this utility model, by setting an air bladder connected to several air ejector pins inside the mold base, and combining it with a liftable lifting plate, an automatic ejection function driven by air pressure is realized. This structure can simultaneously generate a vertical ejection force during demolding, causing the molded part to float as a whole, preventing sticking, significantly improving demolding efficiency and the degree of automation, and avoiding the part deformation problem caused by traditional mechanical forced ejection.

[0019] 2. In this utility model, a vertical and oblique composite ejection structure is formed through the synergistic action of the lifting plate, slide block, inclined ejector rod, pusher rod, and mold head block. This structure achieves simultaneous separation of the sidewall and bottom of the molded part during pneumatic ejection, avoiding localized tearing or jamming, as well as adhesion to the surface of the mold head block. This ensures a smooth and stable demolding process, significantly improving the surface quality and dimensional accuracy of the molded part. It has the advantages of compact structure, high reliability, and strong applicability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the demolding component and airbag structure according to one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the demolding component installation structure according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the cross-section of the inclined push rod and the structure of the push rod according to an embodiment of the present invention;

[0024] Figure 5 This is one embodiment of the present utility model. Figure 2 A schematic diagram of the structure at point A.

[0025] Figure label:

[0026] 100. Mold base; 110. Molding mold; 120. Mold cavity;

[0027] 200. Demolding assembly; 210. Lifting plate; 220. Angled ejector pin; 230. Push rod; 211. Slide block; 221. Head block;

[0028] 300. Airbag body; 310. Air tip. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0030] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0031] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a resin molding apparatus that facilitates demolding.

[0032] Combination Figures 1-5 As shown, this utility model provides a resin compression molding device for easy demolding, including a mold base 100, a demolding component 200, and an air bladder 300. The mold base 100 is used to support and position the molding mold 110. The demolding component 200 is disposed inside the mold base 100 and is used to eject and separate the molded part. The air bladder 300 is connected to the air ejector pin 310 and is used to provide air pressure power during demolding to realize the automatic ejection function.

[0033] A molding die 110 is fixedly mounted on the surface of the mold base 100. The surface of the molding die 110 has a mold cavity 120 for heating and molding resin materials. The mold cavity 120 is designed as a smooth and closed cavity according to the product structure requirements, which can ensure the shape accuracy of the molded part during the molding process.

[0034] The demolding assembly 200 includes a lifting plate 210, an angled ejector rod 220, and a pusher rod 230. The lifting plate 210 is slidably mounted on the inner side of the mold base 100 and can move up and down in the vertical direction. A slide block 211 is fixedly mounted on the upper surface of the lifting plate 210, which provides sliding support for the end of the angled ejector rod 220. One end of the angled ejector rod 220 is slidably connected to the surface of the slide block 211, and the other end is fixedly mounted on a head block 221 located inside the mold cavity 120. The pusher rod 230 obliquely penetrates the head block 221 and slidably abuts against the inner side of the mold cavity 120.

[0035] Several air ejector pins 310 are fixedly installed inside the mold base 100, and the ends of the air ejector pins 310 are connected to the air bladder body 300. The air bladder body 300 is located at the bottom of the mold base 100. When it is squeezed or inflated, the internal air pressure is transmitted to the air ejector pins 310 through the channel, driving the air ejector pins 310 to extend and retract in the vertical direction, thereby realizing the ejection of the bottom of the molded part.

[0036] During the molding process, when the mold is closed, the lifting plate 210 is at its lower limit position, the angled ejector rod 220 and the push rod 230 are at their initial angle, the air ejector pin 310 retracts into the mold base 100, and the air bladder 300 is in an uninflated state. After molding is completed, the operator can manually or mechanically lift the lifting plate 210, causing the entire demolding assembly 200 to move upward, thereby achieving automatic ejection and separation of the molded part.

[0037] In this embodiment, the angled ejector 220 is arranged at an angle, with one end sliding through the molding die 110 and the other end forming a matching connection with the mold cavity 120 via the mold head block 221. During molding, the mold head block 221 and the mold cavity 120 together form a complete molding groove structure, allowing the resin material to be molded into the desired product shape within the mold cavity 120 under heating and pressure. The sliding connection between the angled ejector 220 and the slide block 211 ensures a stable and reliable angled movement path of the mold head block 221 during demolding.

[0038] In this embodiment, to prevent the molded part from adhering to the mold wall during demolding, both the surface of the mold cavity 120 and the surface of the head block 221 are processed into a smooth, glossy structure, and both surfaces are coated with an anti-stick coating. The anti-stick coating can be made of polytetrafluoroethylene-based coatings or high-temperature resistant silicone resin materials, which have excellent isolation and heat resistance, and can maintain stable anti-stick performance during multiple molding cycles, effectively preventing the molded part from sticking to the mold or causing surface damage.

[0039] In this embodiment, the two ends of the air bladder 300 are fixedly connected to the opposite surfaces of the molding mold 110 and the lifting plate 210, respectively. When the lifting plate 210 moves upward, it compresses the air bladder 300, causing deformation and a rapid increase in the internal air pressure. The high-pressure gas inside the air bladder 300 acts on the ejector pin 310 through the connecting channel, driving the ejector pin 310 to extend synchronously, thus realizing the ejection function at the bottom of the mold cavity 120. This structure utilizes the elastic deformation of the air bladder 300 to achieve energy conversion, and is simple in structure, responsive, and provides smooth demolding.

[0040] In this embodiment, the air ejector pins 310 adopt a telescopic cylinder structure, consisting of a cylinder body and a telescopic rod. Several air ejector pins 310 are evenly distributed in the bottom area inside the molding die 110, with their tops flush with the surface of the mold cavity 120 to ensure uniform force on the molded part. During demolding, the air ejector pins 310 extend synchronously under air pressure, pushing the bottom of the molded part to prevent warping or breakage due to uneven force. After the molded part is completely removed from the mold cavity, the air bladder 300 depressurizes, and the air ejector pins 310 return to their initial positions, ready for the next molding operation.

[0041] In this embodiment, the push rod 230 obliquely penetrates the molded head block 221, and one end of it is provided with a wedge surface that slides against the inner side of the molding die 110. When the molded head block 221 rises obliquely under the drive of the lifting plate 210, the push rod 230 slides along the oblique path under the mutual abutment action between the wedge surface and the inner wall of the molding die 110, thereby applying a lateral pushing force to the side wall of the molded part, helping the molded part to achieve oblique separation from the surface of the molded head block 221.

[0042] Specifically, when the head block 221 rises, the molded part inside the mold cavity 120 is lifted by the push rod 230 and the angled ejector rod 220, causing its bottom to separate from the side wall simultaneously, achieving smooth overall demolding. This angled ejection structure can effectively avoid localized tearing or deformation of the molded part, ensuring the appearance and dimensional accuracy of the product.

[0043] In this embodiment, a limiting groove structure is provided between the slide block 211 and the lifting plate 210. The limiting groove is arranged along the sliding direction of the lifting plate 210 to limit the lifting stroke of the lifting plate 210 and prevent it from shifting or derailing when the airbag body 300 rebounds or is subjected to uneven force. The limiting groove can be in the form of a groove and a sliding pin, which is simple in structure and can effectively guide the demolding assembly 200 to move smoothly in the vertical direction, improving the overall safety and reliability of operation.

[0044] Working principle and usage process of this utility model:

[0045] This resin molding device mainly achieves automatic ejection and smooth demolding of the molded part after molding through the coordinated action of the mold base 100, the demolding component 200, and the air bladder 300. Its specific working process is as follows:

[0046] When the mold is closed, the forming mold 110 and the mold head block 221 together form the mold cavity 120 for molding the resin material. At this time, the lifting plate 210 is in the lower limit position, the inclined ejector rod 220 and the pusher rod 230 maintain the initial included angle, the air ejector pin 310 retracts, and the air bladder 300 is in an uninflated state.

[0047] After compression molding is completed, the lifting plate 210 can be manually or mechanically raised to deform the air bladder 300. The increased air pressure inside the air bladder 300 acts upwards through the ejector pins 310 to the bottom of the mold cavity 120, driving the ejector pins 310 to extend synchronously in the vertical direction. This process provides initial demolding force under air pressure, causing the molded part to float upwards and preventing sticking.

[0048] As the lifting plate 210 moves upward, the slide block 211 fixed thereon drives the inclined ejector rod 220 to rise along an inclined trajectory. Since the inclined ejector rod 220 is connected to the mold head block 221, the mold head block 221 simultaneously moves obliquely upward along the mold cavity 120. The wedge surface at one end of the push rod 230 contacts and slides against the inner wall of the molding mold 110. During the upward movement of the mold head block 221, it is forced to slide obliquely, thereby applying a lateral pushing force to the side wall of the molded part, helping the molded part to obliquely abut and separate from the surface of the mold head block 221.

[0049] This combined action allows the molded part to separate simultaneously from the bottom and sidewalls of the mold cavity, avoiding localized tearing or deformation.

[0050] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] Although embodiments of the present invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.

Claims

1. A resin molding apparatus for easy demolding, characterized in that, include: The mold base (100), the demolding assembly (200), and the airbag body (300) are provided with a molding mold (110) on the surface of the mold base (100) and a mold cavity (120) on the surface of the molding mold (110). The demolding assembly (200) includes a lifting plate (210), an inclined ejector rod (220), and a pusher rod (230). The lifting plate (210) is slidably installed on the inner side of the mold base (100) and a slide block (211) is fixedly installed on its surface. One end of the inclined ejector rod (220) is slidably connected to the surface of the slide block (211) and the other end is fixedly installed with a mold head block (221) located inside the mold cavity (120). The pusher rod (230) obliquely penetrates the mold head block (221) and slides against the inner side of the mold cavity (120). A number of air ejector pins (310) are fixedly installed on the inner side of the mold base (100), and the ends of the air ejector pins (310) are connected to the air bag body (300) for using air pressure to drive the air ejector pins (310) to extend and retract.

2. The resin molding apparatus for easy demolding according to claim 1, characterized in that, The inclined push rod (220) is arranged at an angle and one end slides through the forming mold (110). The mold head block (221) is used to combine with the mold cavity (120) to form a complete forming groove structure.

3. The resin molding apparatus for easy demolding according to claim 1, characterized in that, The surfaces of the mold cavity (120) and the head block (221) are both smooth and glossy, and both surfaces are provided with an anti-stick coating.

4. The resin molding apparatus for easy demolding according to claim 1, characterized in that, The two ends of the airbag (300) are connected to the opposite surfaces of the molding mold (110) and the lifting plate (210) respectively, and are used to generate high-pressure gas when the lifting plate (210) moves relative to the molding mold (110).

5. The resin molding apparatus for easy demolding according to claim 1, characterized in that, The ejector pin (310) is a telescopic cylinder structure, and several ejector pins (310) are evenly distributed inside the molding die (110), with their top ends and the surface of the mold cavity (120) located in the same plane.

6. The resin molding apparatus for easy demolding according to claim 1, characterized in that, The push rod (230) obliquely penetrates the head block (221), and one end of it is provided with a wedge surface that slides against the inner side of the forming mold (110) to achieve oblique ejection by sliding against the inner wall of the forming mold (110) during the lifting and lowering movement of the head block (221).

7. The resin molding apparatus for easy demolding according to claim 1, characterized in that, A limiting groove structure is provided between the slide block (211) and the lifting plate (210) to limit the lifting stroke of the lifting plate (210) and prevent it from deviating.

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