Hardware injection molding device

Abstract

The utility model discloses a hardware injection molding device, including a first oil cylinder, set up in the output shaft of first oil cylinder a first pull rod, set up in first pull rod a first thimble fixed plate, set up in first thimble fixed plate and be first pull rod push and carry out up and down activity at least a first thimble, be inserted in a mould cavity of first thimble, insert at least a metal piece in mould cavity. The utility model provides a hardware injection molding opening die device, and it has the hardware in the cavity, and the injection molding machine carries out the injection molding of plastic in the cavity, when the plastic is filled up the cavity, the thimble moves down, and the space of thimble moves down is filled up by plastic, and it injection molding simultaneously to the cavity first do support again and then retreat thimble, effectively guarantee the completeness of injection molding, avoid the leakage of copper and cause the electric leakage, guarantee safety, effectively improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of product injection molding technology, and in particular to a hardware injection molding device. Background Technology

[0002] Hardware refers to tools made from metals such as gold, silver, copper, iron, and tin through processing and casting, used for fixing, processing, and decoration. To meet diverse usage needs, a process using plastic overmolding has emerged. This involves using a high-hardness metal component as the base of the product, then injecting plastic or other overmolding materials into the metal surface through an injection molding machine to achieve superior corrosion and rust resistance, insulation, and aging resistance. During plastic injection molding, slides and ejector pins are used to push and fix the metal component and the mold cavity. When the ejector pins are inserted into the cavity and demolded after injection molding, holes remain at their insertion points. These holes may later expose the metal component within the plastic, leading to aging and other safety issues during product use. Utility Model Content

[0003] To address the aforementioned shortcomings, the purpose of this utility model is to provide a hardware injection molding device. The device contains a molded hardware part within a cavity. An injection molding machine injects plastic into the cavity. When the plastic is almost full, the ejector pin moves downwards, filling the space left by the ejector pin. Simultaneously with injection, the device first supports the cavity before retracting the ejector pin, effectively ensuring the integrity of the injection molding process, preventing copper leakage and potential electrical leakage, ensuring safety, and effectively improving production efficiency.

[0004] The technical solution adopted by this utility model to achieve the above objectives is as follows:

[0005] A metal injection molding device includes a first hydraulic cylinder, a first pull rod disposed on the output shaft of the first hydraulic cylinder, a first ejector pin fixing plate disposed on the first pull rod, at least one first ejector pin disposed on the first ejector pin fixing plate and moved up and down by the first pull rod, a mold cavity in which the first ejector pin is inserted, and at least one metal part inserted into the mold cavity. The first hydraulic cylinder extends to drive the first pull rod to move, the first pull rod pushes the first ejector pin to move upward and insert it into the mold cavity to fix the mold cavity and the metal part. An external injection tube extends into the mold cavity for injection molding. When the injected plastic is about to fill the mold cavity, the first hydraulic cylinder retracts, driving the first pull rod to retract, and the first pull rod drives the first ejector pin to move downward, and the space where the first ejector pin moves downward is filled with plastic.

[0006] As a further improvement of this utility model, the metal part is injection molded into the mold cavity.

[0007] As a further improvement of this utility model, at least one injection cavity matching the metal part is formed inside the mold cavity.

[0008] As a further improvement of this utility model, at least one ejector hole is formed on the lower end surface of the mold cavity for inserting the first ejector pin.

[0009] As a further improvement of this utility model, the upper end of the first ejector pin has a first top position inlet that is raised upward and is generally in the shape of a frustum, and the lower ejector pin hole is generally in the shape of a frustum that is raised inward and upward to match the first top position inlet.

[0010] As a further improvement of this utility model, it also includes a second hydraulic cylinder, a second pull rod disposed on the output shaft of the second hydraulic cylinder, a second ejector pin fixing plate disposed on the second pull rod, and at least one second ejector pin disposed on the second ejector pin fixing plate and pushed up and down by the second pull rod.

[0011] As a further improvement of this utility model, the upper end face of the mold cavity is formed with at least one upper ejector hole for the second ejector pin to be inserted.

[0012] As a further improvement of this utility model, the upper ejector pin hole is offset on the mold cavity along the extension direction of the metal part.

[0013] As a further improvement of this utility model, the bottom end of the second ejector pin is formed with a second ejector position inlet that protrudes downward and is generally in the shape of a frustum, and the upper ejector pin hole is generally in the shape of a frustum that protrudes inward and downward to match the second ejector position inlet.

[0014] The beneficial effects of this utility model are as follows:

[0015] By configuring this metal injection molding device as including a first hydraulic cylinder, a first pull rod disposed on the output shaft of the first hydraulic cylinder, a first ejector pin fixing plate disposed on the first pull rod, at least one first ejector pin disposed on the first ejector pin fixing plate and pushed up and down by the first pull rod, a mold cavity inserted into the first ejector pin, and at least one metal part inserted into the mold cavity, the first hydraulic cylinder extends to drive the first pull rod to move, and the first pull rod pushes the first ejector pin to move upward and insert it into the mold cavity to mold the metal part. The device has a cavity and a metal part fixed inside the mold cavity. The injection tube of the external injection molding machine extends into the mold cavity and uses the metal part as the base for injection molding. When the injected plastic is about to fill the mold cavity, the first hydraulic cylinder retracts, which drives the first pull rod to retract. The first pull rod drives the first ejector pin to move down. The space where the first ejector pin moves down is filled with plastic. This hardware injection molding device supports the cavity first and then retracts the ejector pin while injecting, which effectively ensures the integrity of the injection, avoids leakage of copper that may cause leakage of electricity, ensures the safety of production and products, and improves the practicality of products.

[0016] The above is an overview of the utility model's technical solution. The following description, in conjunction with the accompanying drawings and specific embodiments, will further illustrate the utility model. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0018] Figure 2 This is a front view of the mold cavity;

[0019] Figure 3 This is a schematic diagram of the back of the mold cavity;

[0020] Figure 4 This is a structural schematic diagram of a metal part;

[0021] Figure 5 This is a schematic diagram of a metal part inside a mold cavity;

[0022] Figure 6 A schematic diagram of the structure of the first hydraulic cylinder, the first tie rod, the first ejector pin fixing plate, and the first ejector pin;

[0023] Figure 7 This is a schematic diagram of the structure of the first ejector pin;

[0024] Figure 8 A schematic diagram of the structure of the second hydraulic cylinder, the second tie rod, the second ejector pin fixing plate, and the second ejector pin;

[0025] Figure 9 This is a schematic diagram of the second ejector pin;

[0026] In the diagram: 1. First hydraulic cylinder; 2. First pull rod; 3. First ejector pin fixing plate; 4. First ejector pin; 41. First ejector position entry part; 5. Mold cavity; 51. Injection cavity; 52. Lower ejector pin hole; 53. Upper ejector pin hole; 6. Metal part; 7. Second hydraulic cylinder; 8. Second pull rod; 9. Second ejector pin fixing plate; 10. Second ejector pin; 101. Second ejector position entry part. Detailed Implementation

[0027] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods of this utility model will be described in detail below with reference to the accompanying drawings and preferred embodiments.

[0028] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0031] Please refer to Figures 1 to 9 This utility model provides a hardware injection molding device, including a first hydraulic cylinder 1, a first pull rod 2 disposed on the output shaft of the first hydraulic cylinder 1, a first ejector pin 4 fixing plate 3 disposed on the first pull rod 2, at least one first ejector pin 4 disposed on the first ejector pin 4 fixing plate 3 and pushed up and down by the first pull rod 2, a mold cavity 5 inserted therein by the first ejector pin 4, and at least one metal part 6 inserted into the mold cavity 5. The first hydraulic cylinder 1 extends to drive the first pull rod 2 to move, and the first pull rod 2 pushes the first ejector pin 4 to move upward and insert it. The mold cavity 5 and the metal part 6 inside the mold cavity 5 are fixed. The injection tube of the external injection molding machine extends into the mold cavity 5 and uses the metal part 6 as the base for injection molding. When the injected plastic is about to fill the mold cavity 5, the first hydraulic cylinder 1 retracts, which drives the first pull rod 2 to retract. The first pull rod 2 drives the first ejector pin 4 to move down. The space where the first ejector pin 4 moves down is filled with plastic. This hardware injection molding device supports the cavity first and then retracts the ejector pin while injecting, which effectively ensures the integrity of the injection, avoids leakage of copper and leakage of electricity, ensures the safety of production and products, and improves the practicality of products.

[0032] Regarding the structure and setup of the injection molding machine, the injection molding machine and the injection tube mounted thereon are conventional components in the art, and their operating principle is existing technology; therefore, they will not be described in detail in this embodiment. The mold cavity 5 has an opening for the insertion of the injection tube. Molten plastic is injected into the mold cavity 5 through the injection tube and encapsulated by the metal part 6. The molten plastic is formed within the mold cavity 5 and its shape is constrained by the mold cavity 5, thereby achieving high precision and high quality in the finished product. Furthermore, the strength of the metal part 6 effectively ensures the strength and service life of the finished product. The finished product can be removed after opening the mold cavity 5.

[0033] Preferred, such as Figure 5 As shown, the metal part 6 is injection molded in the mold cavity 5. The mold cavity 5 is provided with a cavity for injecting external metal material. The molten metal material is injected into the mold cavity 5 and cooled to form, which reduces the additional action of producing the metal part 6 and then placing it into the mold cavity 5, thus improving production efficiency.

[0034] For the specific method of external plastic injection into the mold cavity 5 for molding, such as Figures 1 to 4 As shown, at least one injection cavity 51 matching the metal part 6 is formed within the mold cavity 5. Molten plastic is placed into the injection cavity 51 corresponding to the mold cavity, forming a matching plastic encapsulation of the metal part 6. This achieves high precision and high quality in the finished product, and, in conjunction with the strength of the metal part 6, effectively ensures the strength and service life of the finished product. The finished product can be removed after opening the mold cavity 5. The number of injection cavities 51 matches the number of metal parts 6 or the required structure of the finished product. For example, one metal part 6 corresponds to one injection cavity 51, or multiple metal parts 6 correspond to a single injection cavity 51 for injection molding, thereby connecting multiple metal parts 6 into a whole. This can be set according to actual conditions, and therefore no specific limitation is made in this embodiment.

[0035] The specific method by which the first hydraulic cylinder 1 drives the first ejector pin 4 can be set according to the actual situation. For example, a wedge with an inclined surface can be provided between the first pull rod 2 and the fixing plate 3 of the first ejector pin 4. The inclined surface of the wedge contacts the inclined surface at the bottom of the ejector pin. When the wedge moves horizontally, the mutual compression between the inclined surfaces will decompose the horizontal force into a vertical separation, pushing the ejector pin to move upward. Alternatively, a lever structure can be used, where the hydraulic cylinder pushes one end of the lever laterally, the lever rotates around the fulcrum, and the other end drives the ejector pin to move vertically. Alternatively, a gear and rack plus cam or connecting rod structure can be used, where the hydraulic cylinder drives the rack to move laterally, the rack meshes with the gear to rotate, and the gear then converts the rotational motion into the vertical up-and-down movement of the ejector pin through the cam or connecting rod mechanism. There are many ways for the hydraulic cylinder to drive the ejector pin to move vertically up and down, and all of these are conventional technical means in the field. Therefore, no specific limitation is made in this embodiment.

[0036] Regarding the specific method of inserting the first ejector pin 4 into the mold cavity 5, as follows: Figure 3 and Figure 6 and Figure 7 As shown, at least one ejector hole 52 is formed on the lower end surface of the mold cavity 5 for the first ejector pin 4 to be inserted. The first ejector pin 4 is inserted into the lower ejector hole 52 to limit and fix the mold cavity 5 and open the mold.

[0037] Preferred, such as Figure 3 and Figure 6 and Figure 7 As shown, in order to better limit and fix the mold cavity 5 and open the mold, the upper end of the first ejector pin 4 has an upwardly protruding first ejector position inlet 41 that is generally frustum-shaped. The lower ejector hole 52 is generally frustum-shaped, protruding inward and upward, matching the first ejector position inlet 41. When the first ejector pin 4 is inserted into the lower ejector hole 52 on the mold cavity 5, the first ejector position inlet 41 on it first contacts the lower ejector hole 52. The frustum-shaped structure of both has an inclined guiding effect on its side, which makes it easier and more accurate for the first ejector pin 4 to be inserted into the first ejector position inlet 41, so as to complete the purpose of limiting and fixing the mold cavity 5 and opening the mold. This improves the production efficiency and production accuracy of this hardware injection molding device and facilitates the cooperation between various components.

[0038] Preferred, such as Figure 1As shown, in order to further improve the production efficiency of this hardware injection molding device, the hardware injection molding device also includes a second hydraulic cylinder 7, a second pull rod 8 disposed on the output shaft of the second hydraulic cylinder 7, a second ejector pin 10 fixing plate 9 disposed on the second pull rod 8, and at least one second ejector pin 10 disposed on the second ejector pin 10 fixing plate 9 and pushed up and down by the second pull rod 8. The first hydraulic cylinder 1 and the second hydraulic cylinder 7 start simultaneously. The first hydraulic cylinder 1 extends, driving the first pull rod 2 to move. The first pull rod 2 pushes the first ejector pin 4 upward and places it into the mold cavity 5, fixing the mold cavity 5 and the metal part 6 inside the mold cavity 5. The second hydraulic cylinder 7 extends, driving the second pull rod 8 to move. The second pull rod 8 pushes the second ejector pin 10 downward and places it into the mold cavity 5, fixing the mold cavity 5 and the metal part 6 inside the mold cavity 5. The injection tube of the external injection molding machine extends into the mold cavity 5, using the metal part 6 as the base for injection molding. When the injected plastic is almost filling the mold cavity 5, the first hydraulic cylinder 1 retracts, driving the first pull rod 7 to move. When rod 2 retracts, the first pull rod 2 drives the first ejector pin 4 to move downwards, and the space where the first ejector pin 4 moves downwards is filled with plastic. When the second cylinder 7 retracts, it drives the second pull rod 8 to retract, and the second pull rod 8 drives the second ejector pin 10 to move upwards, and the space where the second ejector pin 10 moves upwards is filled with plastic. This hardware injection molding device supports the cavity before retracting the ejector pins while injecting, effectively ensuring the integrity of the injection molding, avoiding leakage of copper and causing leakage of electricity, ensuring the safety of production and products, improving the practicality of products, and through the cooperation of two sets of ejector pins, effectively limiting the mold cavity 5 and facilitating subsequent mold opening, thereby improving the production efficiency and production accuracy of this hardware injection molding device.

[0039] The specific method by which the second cylinder 7 drives the second ejector pin 10 can be set according to the actual situation. For example, a wedge with an inclined surface can be provided between the second pull rod 8 and the fixing plate 9 of the second ejector pin 10. The inclined surface of the wedge contacts the inclined surface at the bottom of the ejector pin. When the wedge moves horizontally, the mutual compression between the inclined surfaces will decompose the horizontal force into a vertical separation, pushing the ejector pin to move upward. Alternatively, a lever structure can be used, where the cylinder pushes one end of the lever laterally, the lever rotates around the fulcrum, and the other end drives the ejector pin to move vertically. Alternatively, a gear and rack plus cam or connecting rod structure can be used, where the cylinder drives the rack to move laterally, the rack meshes with the gear to rotate, and the gear then converts the rotational motion into the vertical up-and-down movement of the ejector pin through the cam or connecting rod mechanism. There are many ways for the laterally moving cylinder to drive the ejector pin to move vertically up and down, and all of these are conventional technical means in the field. Therefore, no specific limitation is made in this embodiment.

[0040] Regarding the specific method of inserting the second ejector pin 10 into the mold cavity 5, as follows: Figure 1 and Figure 2As shown, the upper end face of the mold cavity 5 has at least one upper ejector hole 53 for the second ejector pin 10 to be inserted. The second ejector pin 10 is inserted into the upper ejector hole 53 to limit and fix the mold cavity 5 and to open the mold.

[0041] Preferred, such as Figure 2 As shown, in order to better limit and fix the mold cavity 5 and open the mold, the upper ejector hole 53 is offset on the mold cavity 5 along the extension direction of the metal part 6. The shape of the metal part 6 may have a bent part. The upper ejector hole 53 is matched with the bent position of the metal part 6 to form an offset structure that matches the structure of the metal part 6. This ensures that each upper ejector hole 53 is located in the middle position corresponding to the upper end face of the metal part 6, so that the second ejector 10 can better limit and fix the mold cavity 5 and open the mold. This effectively limits the mold cavity 5 and facilitates subsequent mold opening, improving the production efficiency and production accuracy of this metal injection molding device.

[0042] Preferred, such as Figure 2 , Figure 8 and Figure 9 As shown, in order to better limit and fix the mold cavity 5 and open the mold, the bottom end of the second ejector pin 10 has a downwardly protruding, frustum-shaped second ejector position inlet 101. The upper ejector hole 53 is also frustum-shaped, protruding inward and downward to match the second ejector position inlet 101. When the second ejector pin 10 is inserted into the upper ejector hole 53 in the mold cavity 5, its second ejector position inlet 101 first contacts the upper ejector hole 53. Both are frustum-shaped structures with inclined guiding sides, making it easier and more accurate for the second ejector pin 10 to be inserted into the second ejector position inlet 101, thus achieving the purpose of limiting and fixing the mold cavity 5 and opening the mold. This improves the production efficiency and accuracy of the injection molding device and facilitates the cooperation between various components.

[0043] It should be noted that the hardware injection molding device disclosed in this utility model is an improvement on the specific structure, but the specific control method is not the innovation of this utility model. The injection molding machine, injection pipe, metal parts and other components involved in this utility model can be general standard parts or parts known to those skilled in the art. Their structure, principle and control method are known to those skilled in the art through technical manuals or through conventional experimental methods.

[0044] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, other structures obtained by using the same or similar technical features as the above embodiments of the present utility model are all within the protection scope of the present utility model.

Claims

1. A hardware injection molding device, characterized in that: The system includes a first hydraulic cylinder, a first pull rod mounted on the output shaft of the first hydraulic cylinder, a first ejector pin fixing plate mounted on the first pull rod, at least one first ejector pin mounted on the first ejector pin fixing plate and moved up and down by the first pull rod, a mold cavity into which the first ejector pin is inserted, and at least one metal part inserted into the mold cavity. The first hydraulic cylinder extends to move the first pull rod, and the first pull rod pushes the first ejector pin upward and inserts it into the mold cavity to fix the mold cavity and the metal part. An external injection tube extends into the mold cavity for injection molding. When the injected plastic is about to fill the mold cavity, the first hydraulic cylinder retracts, causing the first pull rod to retract. The first pull rod then moves the first ejector pin downward, and the space where the first ejector pin moves downward is filled with plastic.

2. The hardware injection molding device according to claim 1, characterized in that: The metal part is injection molded into the mold cavity.

3. The hardware injection molding device according to claim 1, characterized in that: The mold cavity contains at least one injection cavity that matches the metal part.

4. The hardware injection molding device according to claim 1, characterized in that: At least one ejector hole is formed on the lower end face of the mold cavity for inserting the first ejector pin.

5. The hardware injection molding device according to claim 4, characterized in that: The upper end of the first ejector pin has an upwardly protruding, frustum-shaped first ejector position inlet, and the lower ejector pin hole is an inwardly and upwardly protruding frustum-shaped part that matches the first ejector position inlet.

6. The hardware injection molding device according to claim 1, characterized in that: It also includes a second hydraulic cylinder, a second pull rod disposed on the output shaft of the second hydraulic cylinder, a second ejector pin fixing plate disposed on the second pull rod, and at least one second ejector pin disposed on the second ejector pin fixing plate and pushed up and down by the second pull rod.

7. The hardware injection molding device according to claim 6, characterized in that: The upper end face of the mold cavity has at least one upper ejector hole for inserting the second ejector pin.

8. The hardware injection molding device according to claim 7, characterized in that: The upper ejector pin hole is offset on the mold cavity along the extension direction of the metal part.

9. The hardware injection molding device according to claim 7, characterized in that: The bottom end of the second ejector pin has a downwardly protruding, frustum-shaped second ejector position inlet, and the upper ejector pin hole is frustum-shaped, protruding inward and downward to match the second ejector position inlet.

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