A plastic mold with a vibration demolding function

Abstract

The application relates to the technical field of injection molds, and discloses a plastic mold capable of achieving vibration demolding, which comprises a lower mold and a U-shaped base, the lower mold is located between the two inner side walls of the U-shaped base, and the two inner side walls of the U-shaped base are fixedly connected with two sliding rails. The plastic mold capable of achieving vibration demolding is characterized in that the cam and the power rod are arranged, the purpose of high-frequency low-amplitude vibration of the lower mold is achieved, a tiny gap is formed between an injection molded part and a cavity wall, demolding resistance is effectively reduced, and product deformation or surface damage caused by forced demolding is avoided; the synchronous ejection mechanism driven by the air cylinder immediately vertically ejects all the injection molded parts after demolding, the high-temperature scalding risk and tool scratching problem of manual part taking are solved, and production safety and product qualification rate are significantly improved.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, specifically to a plastic mold for vibration demolding. Background Technology

[0002] Plastic mold is a shorthand for a combination mold used in compression molding, extrusion molding, injection molding, blow molding, and low-foaming molding.

[0003] An existing patent (publication number: CN214872046U) discloses a vibration-driven demolding plastic mold, belonging to the field of plastic mold technology. This vibration-driven demolding plastic mold includes a base, with a first spring fixedly connected to one side of the inner bottom wall of the base. One end of the first spring is fixedly connected to a first clamping member, and a second spring is fixedly connected to the outer surface of the first clamping member. Through the arrangement of the first spring, vibration motor, vibration rod, and vibration disc, the first spring provides support and shock absorption, enhancing the load-bearing capacity of the first clamping member and greatly increasing stability. The vibration motor controls the vibration frequency of the vibration rod, causing the lower mold base to vibrate through the vibration disc. When a certain vibration level is reached, the plastic part automatically ejects, completing the demolding process. This reduces the labor intensity of the work and effectively prevents product deformation or appearance damage caused by direct demolding, thus affecting product quality.

[0004] The aforementioned mold uses a vibrating plate to vibrate the lower mold base. When the vibration reaches a certain level, the plastic part will automatically pop out. However, during use, the vibration cannot automatically pop out the product. It can only facilitate the separation of the product from the mold, requiring manual removal by workers. Since the temperature of the injection-molded workpiece is high, it is not easy to remove it. Using tools such as pry bars to assist in removal can easily scratch the surface of the product, which is quite inconvenient. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a vibration-driven demolding plastic mold, which has advantages such as easy demolding and solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a vibration-driven demolding plastic mold, comprising a lower mold and a U-shaped base, wherein the lower mold is located between two inner side walls of the U-shaped base, two slide rails are fixedly connected to each of the two inner side walls of the U-shaped base, two slide rails are fixedly connected to the front and back of the U-shaped base, each slider is slidably connected to the slide rail closest to it, reset rods are fixedly connected to both sides of the lower mold, each reset rod is slidably inserted into the U-shaped base, a reset spring is sleeved on the surface of each reset rod, and a power rod is fixedly connected to one side of the lower mold;

[0007] The lower mold has multiple cavities inside, and each cavity has a push plate on its inner bottom wall. The upper surface of each push plate is on the same reference plane as the inner bottom wall of its adjacent cavity. Each push plate has a push rod fixedly connected to its bottom, and the bottom ends of multiple push rods are fixedly connected to the same lifting plate.

[0008] Furthermore, a drive assembly is provided on one side of the U-shaped base. The drive assembly includes two shaft plates and a power rod. One end of the power rod is fixedly connected to one side of the lower mold and slidably inserted into the U-shaped base. The other end of the power rod is fixedly connected to a contact disc. Both shaft plates are fixedly connected to one side of the U-shaped base. A power shaft is rotatably connected between the two shaft plates. A cam is fixedly connected to the outer surface of the power shaft and abuts against the contact disc.

[0009] With the above scheme, when the power shaft drives the cam to rotate, the eccentric motion of the cam is converted into the reciprocating motion of the contact disk, which in turn drives the lower mold to generate high-frequency vibration on the slide rail through the power rod, so that the injection molded part in the cavity and the mold wall are made into a small gap, reducing the demolding resistance.

[0010] Furthermore, a cooling shaft is rotatably connected to one side of the U-shaped base, and a fan blade is fixedly connected to one end of the cooling shaft.

[0011] The above solution generates forced airflow when the fan blades rotate, which accelerates the heat dissipation from the mold surface, shortens the cooling time of the injection molded parts, and avoids high temperature causing demolding deformation.

[0012] Furthermore, a drive shaft is rotatably connected to one side of the U-shaped base, a large gear is fixedly connected to the outer surface of the drive shaft, and a small gear is fixedly connected to the other end of the cooling shaft, with the large gear and the small gear meshing together.

[0013] The above scheme transmits the rotational motion of the power shaft to the transmission shaft through a bevel gear pair, thereby achieving power linkage between the drive structure and the cooling fan blades.

[0014] Furthermore, a cylinder is fixedly connected to the front of the lower mold, and a connecting rod is fixedly connected to the output end of the cylinder. The other end of the connecting rod is fixedly connected to the lifting plate.

[0015] The above solution uses a cylinder-driven connecting rod to lift the lifting plate vertically, allowing all push plates to simultaneously eject the injection molded parts from the cavity, thus achieving automated demolding and avoiding the risk of burns from manual operation.

[0016] Furthermore, airflow grilles are provided on both sides of the U-shaped base.

[0017] The above scheme facilitates airflow from the bottom of the mold.

[0018] Furthermore, the top of the power shaft is fixedly connected to the external motor output end.

[0019] Through the above scheme, the motor provides a continuous power source for the cam rotation and gear transmission, realizing the linkage between vibration demolding and fan blades.

[0020] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0021] This type of vibratory demolding plastic mold achieves high-frequency, low-amplitude vibration of the lower mold through the setting of a cam and a power rod, creating a tiny gap between the injection molded part and the cavity wall, effectively reducing demolding resistance and avoiding product deformation or surface damage caused by forced demolding; combined with a cylinder-driven synchronous ejection mechanism, all injection molded parts are immediately ejected vertically after demolding, solving the risk of high-temperature burns and tool scratches from manual part removal, significantly improving production safety and product qualification rate;

[0022] The rotational motion of the power shaft is transmitted to the cooling shaft through bevel gear transmission. By using a torque-reducing and speed-increasing design between the large and small gears, the speed of the cooling shaft is increased, the air volume output by the fan blades is increased, the heat dissipation on the mold surface is accelerated, the cooling cycle of the injection molded parts is shortened, deformation problems caused by high-temperature demolding are avoided, and production efficiency is improved. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application. Figure 1 ;

[0024] Figure 2 This is a three-dimensional schematic diagram of the overall structure of this application. Figure 2 ;

[0025] Figure 3 This is a front view of the overall structure of this application;

[0026] Figure 4 This is a sectional view of the overall structure of this application from the front.

[0027] In the picture:

[0028] 1. Lower mold; 2. U-shaped base; 3. Slide rail; 4. Slider; 5. Reset rod; 6. Reset spring; 7. Cavity; 8. Push plate; 9. Push rod; 10. Lifting plate;

[0029] 11. Drive assembly; 1101. Shaft plate; 1102. Power rod; 1103. Contact disc; 1104. Power shaft; 1105. Cam;

[0030] 12. Cooling shaft; 13. Fan blade; 14. Drive shaft; 15. Large gear; 16. Small gear; 17. First bevel gear; 18. Second bevel gear; 19. Cylinder; 20. Connecting rod; 21. Airflow grille. Detailed Implementation

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

[0032] Please see Figures 1-4 This embodiment of a vibration-driven demolding plastic mold includes a lower mold 1 and a U-shaped base 2. The lower mold 1 is located between the two inner side walls of the U-shaped base 2. Two slide rails 3 are fixedly connected to both inner side walls of the U-shaped base 2. Two sliders 4 are fixedly connected to the front and back of the U-shaped base 2. Each slider 4 is slidably connected to the slide rail 3 adjacent to it. Reset rods 5 are fixedly connected to both sides of the lower mold 1. Each reset rod 5 is slidably inserted into the U-shaped base 2. A reset spring 6 is sleeved on the surface of each reset rod 5.

[0033] A drive assembly 11 is provided on one side of the U-shaped base 2. The drive assembly 11 includes two shaft plates 1101 and a power rod 1102. One end of the power rod 1102 is fixedly connected to one side of the lower mold 1, and the power rod 1102 is slidably inserted into the U-shaped base 2. The other end of the power rod 1102 is fixedly connected to a contact disc 1103. Both shaft plates 1101 are fixedly connected to one side of the U-shaped base 2. A power shaft 1104 is rotatably connected between the two shaft plates 1101. A cam 1105 is fixedly connected to the outer surface of the power shaft 1104. The cam 1105 is connected to the contact disc. When the cam 1105 rotates due to the contact of the cam 1103, the eccentric motion of the cam 1105 is converted into the reciprocating motion of the contact disc 1103. This motion, in turn, drives the lower mold 1 to generate high-frequency vibration on the slide rail 3 via the power rod 1102, causing a small gap between the injection molded part and the mold wall in the cavity 7, thus reducing the demolding resistance. A cooling shaft 12 is rotatably connected to one side of the U-shaped base 2, and a fan blade 13 is fixedly connected to one end of the cooling shaft 12. When the fan blade 13 rotates, it generates forced airflow, which accelerates the heat dissipation from the mold surface, shortens the cooling time of the injection molded part, and avoids demolding deformation caused by high temperature.

[0034] The lower mold 1 has multiple cavities 7 inside. Each cavity 7 has a push plate 8 on its inner bottom wall. The upper surface of each push plate 8 is on the same reference plane as the inner bottom wall of its adjacent cavity 7. Each push plate 8 has a push rod 9 fixedly connected to its bottom. The bottom ends of multiple push rods 9 are fixedly connected to the same lifting plate 10. The design of the push plate 8 being flush with the inner bottom wall of the cavity 7 ensures that the molten plastic fully fills the cavity 7 during injection molding, avoiding the generation of burrs. The lifting plate 10 is linked with all push plates 8 through the push rods 9, providing a foundation for the subsequent ejection mechanism.

[0035] A drive shaft 14 is rotatably connected to one side of the U-shaped base 2. A large gear 15 is fixedly connected to the outer surface of the drive shaft 14. A small gear 16 is fixedly connected to the other end of the cooling shaft 12. The large gear 15 and the small gear 16 are meshed together. By increasing the rotational speed of the cooling shaft 12, the output air volume of the fan blade 13 is increased. A first bevel gear 17 is fixedly connected to the bottom end of the power shaft 1104. A second bevel gear 18 is fixedly connected to one end of the drive shaft 14. The first bevel gear 17 and the second bevel gear 18... The bevel gears 18 mesh with each other, transmitting the rotational motion of the power shaft 1104 to the transmission shaft 14 through the bevel gear pair, thereby realizing the power linkage between the drive structure and the cooling fan blades 13. A cylinder 19 is fixedly connected to the front of the lower mold 1, and a connecting rod 20 is fixedly connected to the output end of the cylinder 19. The other end of the connecting rod 20 is fixedly connected to the lifting plate 10. The cylinder 19 drives the connecting rod 20 to drive the lifting plate 10 to rise vertically, so that all the push plates 8 simultaneously eject the injection molded parts from the cavity 7, thereby realizing automated demolding and avoiding the risk of burns from manual operation.

[0036] Both sides of the U-shaped base 2 are provided with airflow grilles 21 to facilitate airflow from the bottom of the mold. The top of the power shaft 1104 is fixedly connected to the external motor output end. Through the above settings, the motor provides a continuous power source for the rotation of the cam 1105 and gear transmission, realizing the linkage between vibration demolding and fan blade 13.

[0037] The working principle of the above embodiment is as follows: Before injection molding, the push plate 8 is flush with the bottom wall of the cavity 7 to ensure that the molten plastic fully fills the cavity 7 and avoids burrs on the edges of the injection molded part. After the upper mold and lower mold 1 are separated, the external motor is started, and the power shaft 1104 rotates. Through the meshing of the first bevel gear 17 and the second bevel gear 18, the rotational motion is transmitted to the transmission shaft 14. The transmission shaft 14 drives the large gear 15 to rotate. The large gear 15 drives the small gear 16 through gear meshing, which increases the speed of the cooling shaft 12 and increases the output air volume of the fan blade 13. The rotation of the fan blade 13 generates directional airflow. The airflow flows evenly through the airflow grilles 21 on both sides of the U-shaped base 2 and passes through the bottom of the mold, accelerating the heat dissipation of the mold surface. To shorten the cooling time of the injection molded parts and avoid high temperature-induced demolding deformation, the power shaft 1104 simultaneously drives the cam 1105 to rotate. The eccentric movement of the cam 1105 pushes the contact disk 1103 to move back to the reset position. In turn, the power rod 1102 drives the lower mold 1 to vibrate at high frequency on the slide rail 3. The vibration creates a small gap between the injection molded part and the mold wall in the cavity 7, reducing demolding resistance and achieving initial separation of the injection molded part from the mold. After cooling and vibration are completed, the cylinder 19 is activated, driving the lifting plate 10 to rise vertically through the connecting rod 20. The lifting plate 10 drives all the push rods 9 to rise synchronously, and the push plate 8 ejects the injection molded part in the cavity 7 in one go. No manual operation is required, avoiding the risk of high temperature burns and tool scratches on the product surface.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vibration-driven demolding plastic mold, comprising a lower mold (1) and a U-shaped base (2), characterized in that: The lower mold (1) is located between the two inner walls of the U-shaped base (2). Two slide rails (3) are fixedly connected to the two inner walls of the U-shaped base (2). Two sliders (4) are fixedly connected to the front and back of the U-shaped base (2). Each slider (4) is slidably connected to the slide rail (3) it is close to. Reset rods (5) are fixedly connected to both sides of the lower mold (1). Each reset rod (5) is slidably inserted into the U-shaped base (2). A reset spring (6) is sleeved on the surface of each reset rod (5). The lower mold (1) has multiple cavities (7) inside. Each cavity (7) has a push plate (8) on its inner bottom wall. The upper surface of each push plate (8) is on the same reference plane as the inner bottom wall of its adjacent cavity (7). Each push plate (8) has a push rod (9) fixedly connected to its bottom. The bottom ends of multiple push rods (9) are fixedly connected to the same lifting plate (10).

2. The plastic mold for vibration demolding according to claim 1, characterized in that: A drive assembly (11) is provided on one side of the U-shaped base (2). The drive assembly (11) includes two shaft plates (1101) and a power rod (1102). One end of the power rod (1102) is fixedly connected to one side of the lower mold (1). The power rod (1102) is slidably inserted into the U-shaped base (2). The other end of the power rod (1102) is fixedly connected to a contact disc (1103). Both shaft plates (1101) are fixedly connected to one side of the U-shaped base (2). A power shaft (1104) is rotatably connected between the two shaft plates (1101). A cam (1105) is fixedly connected to the outer surface of the power shaft (1104). The cam (1105) abuts against the contact disc (1103).

3. The plastic mold for vibration demolding according to claim 1, characterized in that: A cooling shaft (12) is rotatably connected to one side of the U-shaped base (2), and a fan blade (13) is fixedly connected to one end of the cooling shaft (12).

4. A plastic mold for vibration demolding according to claim 2 or 3, characterized in that: A drive shaft (14) is rotatably connected to one side of the U-shaped base (2). A large gear (15) is fixedly connected to the outer surface of the drive shaft (14). A small gear (16) is fixedly connected to the other end of the cooling shaft (12). The large gear (15) and the small gear (16) are meshed together. A first bevel gear (17) is fixedly connected to the bottom end of the power shaft (1104). A second bevel gear (18) is fixedly connected to one end of the drive shaft (14). The first bevel gear (17) and the second bevel gear (18) are meshed together.

5. A plastic mold for vibration demolding according to claim 1, characterized in that: A cylinder (19) is fixedly connected to the front of the lower mold (1), and a connecting rod (20) is fixedly connected to the output end of the cylinder (19). The other end of the connecting rod (20) is fixedly connected to the lifting plate (10).

6. A plastic mold for vibration demolding according to claim 3, characterized in that: The U-shaped base (2) has airflow grilles (21) on both sides.

7. A plastic mold for vibration demolding according to claim 2, characterized in that: The top end of the power shaft (1104) is fixedly connected to the external motor output end.

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