Injection mold with secondary ejection structure of outer push plate

Abstract

The utility model belongs to injection mold field provides a kind of injection mold with outer push plate secondary ejection structure, comprising: fixed mould base;Movable mould base, it is movably arranged in the lower of fixed mould base, and when movable mould base and fixed mould base adhere, product cavity is formed between movable mould base and fixed mould base;First demoulding component is set on movable mould base, and first demoulding component includes movable module and outer push plate.Compared with prior art, the utility model has the advantages that the movement of movable module is driven by first demoulding component, the smooth demoulding of hollow cylinder is realized by the first action of core and outer push plate, the second action of outer push plate is driven by ejector rod, the buckle part is ensured to be smoothly separated from product to core outside, the whole process is coherent and accurate, and the demoulding efficiency and product forming quality are greatly improved, the problem that product with complex structure is easily jammed and damaged in demoulding process is effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of injection molds, specifically relating to an injection mold with a secondary ejection structure of an external push plate. Background Technology

[0002] In the field of injection molding, with the increasing complexity of product structures, especially the growing demand for plastic products with features such as hollow cylindrical sections, snap-fit ​​structures, and lateral grooves, traditional mold structures face more and more technical challenges during demolding. These products often need to overcome structural interference in multiple demolding directions during demolding. If the demolding structure is not designed properly, it can easily cause the product to jam, deform, break, or even damage the mold core, seriously affecting production efficiency, product yield, and mold life.

[0003] Taking a plastic part with a hollow cylindrical section and a snap-fit ​​section as an example (see reference) Figure 2 and Figure 4 As shown in the diagram, during the molding process of this type of product, the hollow cylindrical part is usually formed by the cooperation of a core and a molding rod, while the snap-fit ​​part is composed of a lateral core or an elastic structure. During the demolding stage, the hollow cylindrical part needs to be smoothly ejected from the molding rod, while the snap-fit ​​part needs to overcome a large demolding resistance to be ejected from the core. If a traditional single ejection structure (such as ejector pin ejection, ejector plate ejection, etc.) is used, it is difficult to achieve step-by-step demolding, which often leads to concentrated demolding force, product deformation or damage, or even mold jamming, affecting the normal opening and closing action of the mold. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing an injection mold with a secondary ejection structure featuring an external push plate, which has a simple structure, can stably achieve two independent demolding actions, and improves demolding efficiency and product molding quality.

[0005] The objective of this utility model can be achieved by addressing the following technical problem: a molding die with a secondary ejection structure using an external pusher plate is provided for molding products with snap-fit ​​parts and hollow cylinders, including:

[0006] Fixed mold base;

[0007] A movable mold base is movably disposed below the fixed mold base, and when the movable mold base is in contact with the fixed mold base, a product cavity is formed between the movable mold base and the fixed mold base;

[0008] A first demolding assembly is disposed on the moving mold base. The first demolding assembly includes a moving module and an outer push plate. A core is disposed on the moving module, and a forming rod is mounted on the moving mold base. The forming rod passes through the moving module and extends into the core to form the hollow cylinder between the forming rod and the core. The outer push plate is disposed on the moving module and is located at the bottom of the product cavity.

[0009] The second demolding component is movably disposed within the moving mold base. The movable end of the second demolding component is connected to a push rod, which passes through the moving mold base and is connected to the outer push plate.

[0010] When the first demolding component and the second demolding component are driven synchronously along the mold opening direction, the moving module pushes the core together with the outer push plate to move, so as to disengage the hollow cylinder from the molding rod; and when the push rod drives the outer push plate to move, it disengages the buckle part so as to separate the product from the core.

[0011] In the above-mentioned injection mold with an external push plate secondary ejection structure, the first demolding component further includes a driving component, which is installed in the moving mold base, and the output end of the driving component is connected to the moving mold base.

[0012] In the above-mentioned injection mold with a secondary ejection structure of an outer push plate, a fixed column is also connected inside the moving module, and a fixed sleeve is provided on the outer push plate, the fixed sleeve being movably sleeved on the fixed column.

[0013] In the above-mentioned injection mold with a secondary ejection structure of an outer push plate, the second demolding assembly further includes a top plate and an ejector pin fixing plate, wherein the top plate abuts against the bottom wall of the ejector pin fixing plate; and the end of the ejector pin away from the outer push plate is connected to the ejector pin fixing plate.

[0014] In the above-mentioned injection mold with an external push plate secondary ejection structure, the top plate and the ejector pin fixing plate are jointly equipped with an anti-misalignment guide sleeve, the moving mold base is equipped with a guide post, and the anti-misalignment guide sleeve is movably sleeved on the guide post.

[0015] In the above-mentioned injection mold with an external push plate secondary ejection structure, the bottom wall of the moving mold base is connected to an L-shaped limiting block, the bottom wall of the top plate is provided with a limiting groove, and the L-shaped limiting block is movably engaged in the limiting groove.

[0016] In the above-mentioned injection mold with an external push plate secondary ejection structure, the moving mold base is provided with an installation groove, the bottom of the forming rod is provided with a connecting block, the connecting block is provided with a connecting hole, and the connecting hole can be connected to the moving mold base by fasteners when the connecting block extends into the installation groove.

[0017] In the above-mentioned injection mold with an external push plate secondary ejection structure, the top plate and the ejector pin fixing plate together form an interconnected assembly hole and a locking hole, and the inner diameter of the assembly hole is larger than the inner diameter of the locking hole.

[0018] In the above-mentioned injection mold with an external push plate secondary ejection structure, an inclined pad is installed on the fixed mold base, and an inclined surface is formed on the inner wall of the moving mold base, and the inclined pad is movably attached to the inclined surface.

[0019] In the above-mentioned injection mold with an external push plate secondary ejection structure, a guide post is provided in the moving mold base, and a guide hole is provided in the fixed mold base, with the guide post being movably inserted into the guide hole.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention provides an injection mold with a secondary ejection structure of an outer push plate. By moving the first demolding component, the hollow cylinder can be successfully demolded by the first action of the core and the outer push plate. At the same time, the second action of the outer push plate driven by the ejector rod can ensure that the snap-fit ​​part is smoothly disengaged from the core along with the product. The whole process is smooth and precise, which greatly improves the demolding efficiency and product molding quality, and effectively solves the problem of easy jamming and damage of products with complex structures during the demolding process.

[0022] (2) Anti-misalignment guide sleeves are set in the top plate and the ejector pin fixing plate, and cooperate with the guide pins on the moving mold base to form a guide structure, which further improves the guiding accuracy of the second demolding component during the movement process, effectively prevents the demolding component from being misaligned or tilted during operation, ensures the accuracy of the ejector pin action, and improves the stability of mold operation and demolding effect.

[0023] (3) By inserting guide pillars into guide holes, precise guidance is provided for the opening and closing of the mold, ensuring that the moving mold base and the fixed mold base remain stably aligned during the mold opening and closing process, avoiding cavity misalignment or poor product molding caused by offset, and significantly improving the accuracy and stability of the mold. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the moving mold base;

[0025] Figure 2 yes Figure 1 Schematic diagram of the cross section at point AA;

[0026] Figure 3 This is a schematic diagram of the installation structure of the second demolding component;

[0027] Figure 4 yes Figure 2 A magnified view of a section at point B in the middle;

[0028] Figure 5 This is a schematic diagram of the installation structure between the top plate and the top rod fixing plate;

[0029] Figure 6 This is a schematic diagram of the fixed mold base.

[0030] In the diagram, 1 is the product; 10 is the snap-fit ​​part; and 11 is the hollow cylinder.

[0031] 2. Fixed mold base; 20. Inclined pad; 21. Guide hole;

[0032] 3. Moving mold base; 30. Guide pillar; 31. L-shaped limit block; 32. Mounting groove; 33. Inclined surface; 34. Guide pillar;

[0033] 4. First demolding assembly; 40. Moving module; 400. Fixed column; 41. Outer push plate; 410. Fixed sleeve; 42. Core; 43. Forming rod; 430. Connecting block; 430a. Connecting hole; 44. Driving component;

[0034] 5. Second demolding assembly; 50. Ejector pin; 51. Ejector plate; 510. Limiting groove; 52. Ejector pin fixing plate; 530. Anti-misalignment guide sleeve; 531. Assembly hole; 532. Locking hole. Detailed Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0037] like Figures 1 to 6 As shown, this utility model discloses an injection mold with a secondary ejection structure of an outer push plate 41, used to form a product 1 with a snap-fit ​​part 10 and a hollow cylinder 11. The injection mold includes a fixed mold base 2, a moving mold base 3, a first demolding component 4, and a second demolding component 5.

[0038] The movable mold base 3 is movably disposed below the fixed mold base 2, and when the movable mold base 3 and the fixed mold base 2 are fitted together, a cavity for product 1 is formed between the movable mold base 3 and the fixed mold base 2; the first demolding assembly 4 is disposed on the movable mold base 3, and the first demolding assembly 4 includes a movable module 40 and an outer push plate 41. A core 42 is disposed on the movable module 40, and a forming rod 43 is mounted on the movable mold base 3. The forming rod 43 passes through the movable module 40 and extends into the core 42 to form a hollow cylinder 11 between the forming rod 43 and the core 42; the outer push plate 41 is disposed on the movable module 40. The first demolding assembly 4 and the second demolding assembly 5 are movably disposed in the moving mold base 3. The moving end of the second demolding assembly 5 is connected to the ejector rod 50, which passes through the moving module 40 and is connected to the outer push plate 41. When the first demolding assembly 4 and the second demolding assembly 5 are driven synchronously along the mold opening direction, the moving module 40 pushes the core 42 together with the outer push plate 41 to move, so as to separate the hollow cylinder 11 from the molding rod 43. When the ejector rod 50 drives the outer push plate 41 to move, it disengages the buckle part 10 to separate the product 1 from the core 42.

[0039] like Figures 2 to 4 As shown, this embodiment requires a hollow cylinder 11 and a snap-fit ​​part 10 on the integrally molded product 1. During the mold closing process, the moving mold base 3 and the fixed mold base 2 are fitted together (i.e., the mold closing action), forming a complete cavity for the product 1. At this time, the moving module 40 in the first demolding assembly 4 is tightly fitted with the core 42, and the forming rod 43 passes through the moving module 40 and is inserted into the core 42, thereby forming a mold cavity space for molding the hollow cylinder 11 between the forming rod 43 and the core 42. The snap-fit ​​part 10 of the product 1 is formed in the corresponding position of the cavity of the product 1 by the cooperation of the core 42 and the forming rod 43. As the plastic melt enters the cavity through the injection molding system, after cooling and solidification, the product 1 with the structure of the snap-fit ​​part 10 and the hollow cylinder 11 can be formed. After the moving mold base 3 moves away from the fixed mold base 2 (i.e., the mold opening action), the first demolding assembly 4 pushes the moving module 40 together with the outer push plate 41 synchronously along the mold cavity. Figure 2 Moving vertically upwards, since the forming rod 43 is fixed on the moving mold base 3, the core 42 gradually detaches from the forming rod 43 during the movement, thereby realizing the demolding of the hollow cylinder 11 from the forming rod 43. It should be noted that during this process, the second demolding component 5 synchronously pushes the outer push plate 41 to move, so that the outer push plate 41 can realize the demolding operation of the hollow cylinder 11 after the first action; after the completion of the above-mentioned first demolding action, the second demolding component 5 continues along... Figure 2The mold moves vertically upwards, which in turn pushes the outer push plate 41 relative to the moving module 40 further through the push rod 50. The outer push plate 41 acts on the bottom of the product 1, thereby pushing the snap-fit ​​part 10 of the product 1 away from the core 42, ensuring smooth demolding of the snap-fit ​​part 10 along with the product 1. Therefore, this injection mold completes the demolding of the hollow cylinder 11 and the snap-fit ​​part 10 through two independent demolding actions. The entire process is smooth and precisely controlled, greatly improving demolding efficiency and the molding quality of the product 1, and effectively solving the problem of jamming and damage to products with complex structures during demolding.

[0040] The first demolding component 4 also includes a drive component 44, which is installed in the moving mold base 3, and the output end of the drive component 44 is connected to the moving module 40.

[0041] like Figure 2 As shown, the introduction of the driving component 44 in this embodiment enables precise control of parameters such as displacement, speed, and demolding force of the moving module 40. This avoids the uncontrollable motion problems caused by the traditional method of relying on mold opening force to drive demolding, improves the stability and consistency of the demolding process, effectively prevents demolding errors caused by mechanical linkage, and thus improves the demolding accuracy and working efficiency of the mold. Preferably, the driving component 44 can be replaced by other driving methods such as hydraulic drive or pneumatic drive.

[0042] The moving mold base 3 has an installation groove 32, and the bottom of the forming rod 43 has a connecting block 430. The connecting block 430 has a connecting hole 430a. When the connecting block 430 extends into the installation groove 32, it can be connected to the moving mold base 3 by fasteners.

[0043] like Figure 3 As shown, the position of the forming rod 43 in this embodiment determines the quality of the hollow cylinder 11 structure. Therefore, during the installation process, the forming rod 43 can be pre-extended into the mounting groove 32 through the connecting block 430. When the forming rod 43 is in the correct posture (i.e., placed in the vertical direction), it can be fixed in the moving mold base 3 by fasteners passing through the connecting hole 430a. This structure facilitates the quick installation and replacement of the forming rod 43, improves the maintenance efficiency and flexibility of the mold, and is especially suitable for multi-variety small-batch production occasions that require frequent replacement of the forming structure, which greatly ensures the quality of the formed product 1.

[0044] The second demolding assembly 5 also includes a top plate 51 and a push rod fixing plate 52. The top plate 51 abuts against the bottom wall of the push rod fixing plate 52; the end of the push rod 50 away from the outer push plate 41 is connected to the push rod fixing plate 52.

[0045] like Figure 3As shown, after the outer push plate 41, together with the core 42, carries the formed hollow cylinder 11 away from the forming rod 43, the top plate 51 in the second demolding assembly 5 is pushed by an external driving mechanism (such as a hydraulic cylinder or pneumatic cylinder) along... Figure 3 Moving vertically upwards, the top plate 51 presses against the bottom wall of the ejector pin fixing plate 52, thereby transmitting power to the ejector pin fixing plate 52. Since one end of the ejector pin 50 is connected to the ejector pin fixing plate 52 and the other end passes through the moving module 40 and is connected to the outer push plate 41, the ejector pin 50 can push the outer push plate 41 to move further relative to the moving module 40 as it moves upwards with the ejector pin fixing plate 52. Since the outer push plate 41 acts on the bottom of the product 1, the snap-fit ​​part 10 is disengaged from the core 42, ensuring the smoothness of the snap-fit ​​part 10 when demolding the product 1. This structure enhances the overall rigidity and stability of the demolding assembly, helps to achieve precise ejection of the snap-fit ​​part 10 of the product 1, and reduces the risk of deformation or damage to the product 1 during demolding.

[0046] like Figure 3 As shown, in this embodiment, an anti-misalignment guide sleeve 530 is also provided in the top plate 51 and the ejector pin fixing plate 52, and cooperates with the guide post 30 on the moving mold base 3 to form a guide structure, which further improves the guiding accuracy of the second demolding component 5 during the movement process. This structure can effectively prevent the demolding component from being misaligned or tilted during operation, ensure the accuracy of the ejector pin 50's movement, and improve the stability of the mold operation and the demolding effect.

[0047] Similarly, such as Figure 1 and Figure 3 As shown, this embodiment also includes a fixed post 400 inside the moving module 40 and a fixed sleeve 410 on the outer push plate 41, so that the outer push plate 41 can be slidably mounted on the fixed post 400. This ensures the guiding stability of the outer push plate 41 during the demolding process of the snap-fit ​​part 10 by moving relative to the moving module 40. Therefore, this structure enhances the guiding accuracy of the movement of the outer push plate 41, prevents it from deviating or jamming during movement, and improves the reliability of the demolding action and the service life of the mold.

[0048] The bottom wall of the moving mold base 3 is connected to an L-shaped limiting block 31, and the bottom wall of the top plate 51 has a limiting groove 510, in which the L-shaped limiting block 31 is movably engaged.

[0049] like Figure 3 and Figure 5As shown, in this embodiment, an L-shaped limiting block 31 is provided at the bottom of the moving mold base 3, and a limiting groove 510 is provided at the bottom of the top plate 51. The L-shaped limiting block 31 is movably engaged in the limiting groove 510, thereby limiting and controlling the movement range of the top plate 51. This ensures that the top plate 51 and the ejector pin fixing plate 52 are in their reset positions after the demolding operation is completed, effectively preventing the top plate 51 from exceeding the set stroke, avoiding mechanical damage caused by over-stroke, and improving the safety and service life of the mold operation.

[0050] like Figure 5 As shown, in this embodiment, the top plate 51 and the top rod fixing plate 52 are provided with interconnected assembly holes 531 and locking holes 532. Since the diameter of the assembly hole 531 is larger than that of the locking hole 532, the driving end of the external driving mechanism can pass through the assembly hole 531 in advance during the assembly process and move along the radial direction of the assembly hole 531 (i.e., Figure 5 (Move from right to left) and transfer it into the locking hole 532 to finally complete the locking operation between the two, ensuring that the ejector rod 50 is not easy to loosen during the ejection process, thereby improving the reliability of the demolding action and the overall running stability of the mold.

[0051] like Figure 1 and Figure 6 As shown, an inclined pad 20 is provided on the fixed mold base 2, and an inclined surface 33 is provided on the inner wall of the moving mold base 3. The two are in close contact to form an inclined guide structure. This structure provides a guiding function during the mold opening and closing process, ensuring that the moving mold base 3 and the fixed mold base 2 are tightly fitted, improving the mold closing accuracy, preventing product 1 molding defects caused by misalignment, and improving the molding quality and service life of the mold.

[0052] like Figure 1 and Figure 6 As shown, this embodiment also provides a guide post 34 in the moving mold base 3 and a guide hole 21 in the fixed mold base 2. The guide post 34 is inserted into the guide hole 21 to provide precise guidance for the opening and closing of the mold, ensuring that the moving mold base 3 and the fixed mold base 2 maintain stable alignment during the mold opening and closing process, avoiding cavity misalignment or poor product 1 forming caused by offset, and significantly improving the accuracy and stability of the mold.

[0053] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0055] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An injection mold with a secondary ejection structure of an external push plate, used for molding products having a snap-fit ​​part and a hollow cylinder, characterized in that, include: Mold base; A movable mold base is movably disposed below the fixed mold base, and when the movable mold base is in contact with the fixed mold base, a product cavity is formed between the movable mold base and the fixed mold base; A first demolding assembly is disposed on the moving mold base. The first demolding assembly includes a moving module and an outer push plate. A core is disposed on the moving module, and a forming rod is mounted on the moving mold base. The forming rod passes through the moving module and extends into the core to form the hollow cylinder between the forming rod and the core. The outer push plate is disposed on the moving module and is located at the bottom of the product cavity. The second demolding component is movably disposed within the moving mold base. The movable end of the second demolding component is connected to a push rod, which passes through the moving mold base and is connected to the outer push plate. When the first demolding component and the second demolding component are driven synchronously along the mold opening direction, the moving module pushes the core together with the outer push plate to move, so as to disengage the hollow cylinder from the molding rod; and when the push rod drives the outer push plate to move, it disengages the buckle part so as to separate the product from the core.

2. The injection mold with a secondary ejection structure of an external push plate according to claim 1, characterized in that, The first demolding assembly further includes a driving component, which is installed in the moving mold base, and the output end of the driving component is connected to the moving mold base.

3. The injection mold with a secondary ejection structure of an external push plate according to claim 1, characterized in that, The moving module is also connected to a fixed column, and the outer push plate is provided with a fixed sleeve, which is movably fitted onto the fixed column.

4. An injection mold with a secondary ejection structure of an external push plate according to claim 2, characterized in that, The second demolding assembly further includes a top plate and a push rod fixing plate, the top plate abutting against the bottom wall of the push rod fixing plate; the end of the push rod away from the outer push plate is connected to the push rod fixing plate.

5. An injection mold with a secondary ejection structure of an external push plate according to claim 4, characterized in that, An anti-misalignment guide sleeve is installed in both the top plate and the top rod fixing plate, and a guide post is installed in the moving mold base. The anti-misalignment guide sleeve is movably sleeved on the guide post.

6. An injection mold with a secondary ejection structure of an external push plate according to claim 4, characterized in that, The bottom wall of the moving mold base is connected to an L-shaped limiting block, and the bottom wall of the top plate is provided with a limiting groove, and the L-shaped limiting block is movably engaged in the limiting groove.

7. An injection mold with a secondary ejection structure of an external push plate according to claim 1, characterized in that, The moving mold base has an installation groove, and the bottom of the forming rod has a connecting block. The connecting block has a connecting hole, which can be connected to the moving mold base by fasteners when the connecting block extends into the installation groove.

8. An injection mold with a secondary ejection structure of an external push plate according to claim 4, characterized in that, The top plate and the top rod fixing plate together form an interconnected assembly hole and a locking hole, and the inner diameter of the assembly hole is larger than the inner diameter of the locking hole.

9. An injection mold with a secondary ejection structure of an external push plate according to claim 1, characterized in that, An inclined pad is installed on the fixed mold base, and an inclined surface is formed on the inner wall of the moving mold base. The inclined pad is movably attached to the inclined surface.

10. An injection mold with a secondary ejection structure of an external push plate according to claim 1, characterized in that, The moving mold base is provided with a guide post, and the fixed mold base is provided with a guide hole, with the guide post being movably inserted into the guide hole.

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