An injection mold having an anti-sticking mold device

Abstract

The application discloses an injection mold with an anti-sticking mold device, which is used for injection molding of a product, the product comprising a plurality of hollow columns arranged at intervals, the injection mold comprising: an inclined ejector pin, which is provided with a first cavity and a second cavity in communication with each other, and a first surface is arranged on the side of the inclined ejector pin away from the product, and the hollow columns are formed in the second cavity; the anti-sticking mold device is arranged in one-to-one correspondence with the hollow columns and is suitable for pushing the hollow columns, and the anti-sticking mold device comprises a sleeve assembly, a tube core assembly and an elastic member, the sleeve assembly comprises a first sleeve and a second sleeve connected with each other, a part of the second sleeve is arranged in the second cavity, the elastic member is sleeved on the outside of the second sleeve, the first sleeve comprises a sleeve head end and a sleeve tail end, the sleeve tail end is arranged in protrusion relative to the first surface, the sleeve tail end is driven by a driving force, so that the sleeve head end compresses the elastic member and drives the second sleeve to move, and when the sleeve assembly moves, only the space in the axial direction is occupied, and the occupied space is smaller.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and more particularly to an injection mold with an anti-sticking device. Background Technology

[0002] During injection molding, the product is in close contact with the mold cavity surface, especially for products with hollow pillars. The inner wall of the hollow pillar has a large contact area with the mold core, making it prone to sticking during demolding. Sticking not only leads to demolding difficulties and production interruptions, but can also cause product deformation and surface damage, affecting product quality and production efficiency.

[0003] In existing technologies, ejector pins and ejector plates are commonly used for demolding. However, ejector pins and ejector plates have relatively complex structures and occupy a large amount of space, while angled ejectors have a smaller volume and limited space for setting up demolding devices. In particular, when a product has multiple hollow pillars, the installation space required for the demolding device to match it is even larger. Therefore, it is essential to provide an injection mold with a simple structure, small space occupation, and the ability to demold multiple hollow pillars. Utility Model Content

[0004] One objective of this application is to provide an injection mold with an anti-sticking device to solve the problems of uneven ejection force and complex structure of the anti-sticking mold.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: an injection mold with an anti-sticking device, the injection mold being used for injection molding a product, the product comprising a plurality of hollow columns spaced apart, the injection mold comprising: a slanted ejector, the slanted ejector having a first cavity and a second cavity interconnected, and the slanted ejector having a first surface on the side facing away from the product, the hollow columns being formed in the second cavity; an anti-sticking device, the anti-sticking device being arranged correspondingly to each of the hollow columns, and the anti-sticking device being adapted to push the hollow columns, the anti-sticking device comprising a sleeve assembly, a core assembly, and an elastic element, the sleeve assembly comprising a first sleeve and a second sleeve connected together, a portion of the second sleeve being disposed in the second cavity, the elastic element being sleeved on the outside of the second sleeve, the first sleeve comprising a sleeve head end and a sleeve tail end, the sleeve tail end being protruding relative to the first surface, the sleeve tail end being driven by a driving force, causing the sleeve head end to compress the elastic element and drive the second sleeve to move, thereby creating a gap between the product and the slanted ejector.

[0006] Preferably, when the sleeve assembly moves along the axial direction of the core assembly, the space occupied by the anti-sticking device in the direction perpendicular to the axial direction of the core assembly remains unchanged.

[0007] Further preferably, the distance between two adjacent hollow columns is D1, and the radius of the first cavity is R1, R1 < D1.

[0008] Further preferably, the radius of the hollow column is R2, where 2R2≤R1≤6R2.

[0009] More preferably, the end of the second sleeve away from the hollow column is provided with a protrusion, and the head end of the sleeve is provided with an embedding groove adapted to the protrusion. The embedding groove is disposed through the head end of the sleeve in a direction perpendicular to the axis of the first sleeve.

[0010] Further preferably, the second sleeve has a T-shaped cross-section along the axial direction, the embedded groove has a T-shaped cross-section, the protrusion is provided with a first abutting surface, and the embedded groove is provided with a first mating surface that abuts against the first abutting surface, so as to restrict the second sleeve from moving away from the embedded groove along its own axial direction.

[0011] In a further preferred embodiment, a guide groove is provided at the other end of the first sleeve along the axial direction of the first sleeve, and the core assembly is sequentially inserted into the first sleeve and the second sleeve. The core assembly includes a core that is interlocked with each other and a limiting member. The limiting member is disposed in the guide groove and abuts against the end of the guide groove.

[0012] In a further preferred embodiment, one end of the core extends into the hollow column of the product, and the other end of the core is provided with a slot, into which the limiting member is embedded.

[0013] Further preferably, the inclined top is also provided with a third cavity, which is connected to the first cavity, and the third cavity is adapted to accommodate the limiting member. The limiting member abuts against the inner sidewall of the third cavity to restrict the core from moving along its own axis toward the direction of the product.

[0014] Further preferably, the elastic element is a spring.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: The first sleeve moves under the driving force of demolding, thereby compressing the elastic element. The first sleeve drives the second sleeve to move, so that the second sleeve directly abuts against the hollow column of the product to achieve demolding. This avoids problems such as rapid wear and decreased precision caused by a sleeve bearing multiple functions at the same time. Moreover, the elastic element is confined in the first cavity, so it is not easy to bend or shift when compressed, reducing the risk of local wear caused by eccentricity. The inclined ejector is relatively small, and the space for setting up the anti-sticking device is limited. The product has multiple hollow columns spaced apart. When the sleeve assembly pushes the product away from the inclined ejector, it only occupies the space in the axial direction, so that the anti-sticking device can demold products with multiple hollow columns. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an injection mold with an anti-sticking device provided in an embodiment of this application.

[0017] Figure 2 for Figure 1 A cross-sectional view along the AA direction.

[0018] Figure 3 for Figure 2 A magnified view of region B in the middle.

[0019] Figure 4 This is a schematic diagram of the anti-sticking device.

[0020] Figure 5 This is a schematic diagram of the structure of the first sleeve.

[0021] Figure 6 This is a first-view structural diagram of the die assembly.

[0022] Figure 7 This is a structural schematic diagram of the die assembly from a second perspective.

[0023] In the figure: 1. Injection mold; 10. Angled ejector; 101. First surface; 11. First cavity; 12. Second cavity; 13. Third cavity; 131. Inner wall; 20. Anti-sticking device; 21. Sleeve assembly; 211. First sleeve; 211a. Sleeve head end; 211b. Sleeve tail end; 2111. Embedding groove; 21111. First mating surface; 2112. Guide groove; 212. Second sleeve; 2121. Protrusion; 21211. First abutment surface; 22. Core assembly; 221. Core; 2211. Slot; 222. Limiting element; 2221. Through hole; 23. Elastic element; 30. Product; 31. Hollow column. Detailed Implementation

[0024] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and should not be construed as limiting the specific protection scope of this application.

[0026] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0028] This application provides an injection mold 1, such as... Figures 1-3 As shown, the injection mold 1 includes an inclined ejector 10 and an anti-sticking device 20. The injection mold 1 is used to process injection molded products 30. The product 30 has a plurality of hollow pillars 31 on the side near the inclined ejector 10, and the hollow pillars 31 are spaced apart.

[0029] In some embodiments, the inclined ejector 10 has a first cavity 11 and a second cavity 12 that are interconnected along the axial direction. The first cavity 11 and the second cavity 12 are coaxially arranged. The extension direction of the first cavity 11 is towards the product 30. The anti-sticking device 20 is disposed in the first cavity 11. The first cavity 11 surrounds and defines the anti-sticking device 20, making maximum use of the axial space of the inclined ejector 10. It does not need to expand to the surrounding areas and occupy additional space, so that the space occupied by the anti-sticking device 20 is smaller. Therefore, when demolding the product 30 with multiple hollow pillars 31, the space provided by the inclined ejector 10 is sufficient to set up enough anti-sticking devices 20, avoiding positional interference between the anti-sticking devices 20.

[0030] In some embodiments, such as Figure 1As shown, multiple anti-sticking devices 20 are provided, and each anti-sticking device 20 is arranged in a one-to-one correspondence with the hollow column 31. This ensures that when the product 30 is demolded, each anti-sticking device 20 performs the demolding action simultaneously, preventing the product 30 from deforming due to uneven force. The anti-sticking devices 20 can be arranged in an array, a ring, or a linear arrangement. The layout of the anti-sticking devices 20 is determined according to the actual shape of the corresponding product 30 and is not limited here.

[0031] Multiple first sleeves 211 are controlled by the same external demolding mechanism. During the demolding process, the external demolding mechanism contacts the tail ends 211a of multiple sleeves through the pushing component and applies driving force to drive the first sleeves 211 of all anti-sticking devices 20 to move simultaneously, ensuring that the pushing force of each anti-sticking device 20 on the hollow column 31 is consistent and the action time is the same.

[0032] In some embodiments, such as Figure 3 As shown, the distance between two adjacent hollow columns 31 is D1, and the radius of the first cavity 11 is R1, R1 < D1, which can be understood, means that the first cavity 11 is the installation and movement space for the anti-sticking device 20. The anti-sticking device 20 needs to be set up one-to-one with the hollow column 31. If R1≥ D1, that is, if the radius of the first cavity 11 is too large, the edges of two adjacent first cavities 11 will approach each other or even overlap, which will compress the installation space of the anti-sticking device 20 and make it easy to have physical collisions with the adjacent hollow columns 31. Therefore, by strictly limiting the radius of the first cavity 11, positional interference between two adjacent hollow columns 31 is avoided, and the installation space of the inclined top 10 is planned to install enough anti-sticking devices 20 in the limited installation space.

[0033] Furthermore, the radius of the hollow column 31 is R2, 2R2≤R1≤6R2, preferably R1=5R2. It can be understood that the distance between two adjacent hollow columns 31 is much larger than their own diameter, so that there is sufficient isolation space between adjacent anti-sticking devices 20 to avoid mutual interference during demolding.

[0034] In some embodiments, the anti-sticking device 20 includes a sleeve assembly 21, a core assembly 22, and an elastic element 23. The sleeve assembly 21 is sleeved on the outside of the core assembly 22 to restrict the sleeve assembly 21 to move back and forth along the axial direction of the core assembly 22, so as to avoid lateral deviation or tilting.

[0035] Furthermore, the sleeve assembly 21 includes a first sleeve 211 and a second sleeve 212 connected together. The first sleeve 211 has a sleeve head end 211a and a sleeve tail end 211b. The sleeve tail end 211b protrudes from the first surface 101 of the inclined ejector 10, so that the ejection mechanism of the injection mold 1 can apply a driving force to the sleeve tail end 211b, thereby causing the sleeve head end 211a to compress the elastic member 23. The elastic member 23 is sleeved on the outside of the second sleeve 212. The sleeve head end 211a drives the second sleeve 212 to move to push the hollow column 31 of the product 30, so that there is a gap between the product 30 and the inclined ejector 10 to avoid sticking to the mold. The end of the second sleeve 212 can fully contact or partially contact the hollow column 31. It is understandable that the first sleeve 211 only compresses the elastic element 23 and does not come into contact with the product 30, thus avoiding wear of the first sleeve 211. The second sleeve 212 pushes the product 30 to create a gap between it and the inclined top 10. After the second sleeve 212 wears out, only the second sleeve 212 needs to be replaced, and the entire sleeve assembly 21 does not need to be replaced, resulting in lower maintenance costs.

[0036] In some embodiments, such as Figure 3 As shown, the inclined top 10 is provided with a first cavity 11 and a second cavity 12, and the diameter of the first cavity 11 is larger than the diameter of the second cavity 12. The hollow column 31 is formed in the second cavity 12. The first cavity 11 and the second cavity 12 are coaxially arranged. It can be understood that an annular protruding edge is formed at the connection between the first cavity 11 and the second cavity 12. One end of the elastic member 23 abuts against the protruding edge, and the other end of the elastic member 23 contacts the sleeve head end 211a. The elastic member 23 is sleeved on the outside of the second sleeve 212, thereby restricting the movement of the elastic member 23 along the axial direction of the core assembly 22.

[0037] In some embodiments, the end of the second sleeve 212 away from the hollow column 31 is provided with a protrusion 2121, and the sleeve head end 211a is provided with an embedding groove 2111 that is adapted to the protrusion 2121. The embedding groove 2111 is provided through the sleeve head end 211a in a direction perpendicular to the axis of the first sleeve 211, so that the protrusion 2121 can slide into the embedding groove 2111 from the opening of the embedding groove 2111, which is convenient for installation and disassembly. The protrusion 2121 is embedded in the through embedding groove 2111, with a large contact area, and the force transmission direction is consistent with the axis of the sleeve assembly 21, which makes it less likely to cause eccentricity or loosening.

[0038] In some embodiments, such as Figure 5 , Figure 6 as well as Figure 7As shown, the cross-section of the second sleeve 212 along the axial direction is T-shaped, and the cross-section of the embedding groove 2111 is T-shaped. The protrusion 2121 is provided with a first abutting surface 21211, and the embedding groove 2111 is provided with a first mating surface 21111 that abuts against the first abutting surface 21211 to restrict the second sleeve 212 from moving away from the embedding groove 2111 along its own axial direction. The first abutting surface 21211 and the first mating surface 21111 form a surface contact. Compared with point contact or line contact, the force-bearing area is larger, which can disperse axial force and avoid the problem of local stress concentration. The T-shaped cross-section itself has the characteristic of preventing separation. After being embedded, it naturally forms an axial constraint. Even if it is subjected to vibration or slight axial force for a long time, it can maintain the assembly position and will not easily separate, increasing the reliability of the connection between the first sleeve 211 and the second sleeve 212.

[0039] It is understandable that if two sleeves are connected but not aligned, eccentric stress will occur at the connection point, leading to localized wear, deformation, or even breakage. For example... Figure 4 As shown, when the first sleeve 211 is connected to the second sleeve 212, the first sleeve 211 and the second sleeve 212 are coaxially arranged. In the coaxial state, the axial or radial force can be transmitted along the same axis, and no component force will be generated due to eccentricity, thus preventing wear and breakage at the connection.

[0040] In some embodiments, such as Figure 4 as well as Figure 5 As shown, a guide groove 2112 is formed at the end 211a of the sleeve along the axial direction of the first sleeve 211. The core assembly 22 is sequentially inserted into the first sleeve 211 and the second sleeve 212. The core assembly 22 includes a core 221 that is interlocked with each other and a limiting member 222. The limiting member 222 is disposed in the guide groove 2112 and abuts against the end of the guide groove 2112. It can be understood that the guide groove 2112 and the limiting member 222 cooperate with each other to provide radial positioning and axial fixation for the core assembly 22, preventing the core assembly 22 from shifting when the injection mold 1 is vibrated. Moreover, the limiting member 222 abuts against the end of the guide groove 2112, forming a rigid axial constraint to prevent the core assembly 22 from passively shifting.

[0041] In some embodiments, such as Figure 3 as well as Figure 7 As shown, one end of the core 221 extends into the hollow column 31 of the product 30, and the other end of the core 221 is provided with a slot 2211. The limiting member 222 is embedded in the slot 2211. When the first sleeve 211 slides and presses the elastic member 23 relative to the core 221, the first sleeve 211 and the core 221 are coaxially arranged, thereby avoiding the first sleeve 211 from being eccentric and causing local wear of the core 221.

[0042] In some embodiments, the inclined top 10 is further provided with a third cavity 13, which is connected to the first cavity 11 and is formed on the first surface 101. The third cavity 13 is adapted to accommodate the limiting member 222. The limiting member 222 abuts against the inner sidewall 131 of the third cavity 13 to restrict the core 221 from moving along its own axis toward the direction of the product 30. When the first sleeve 211 squeezes the elastic member 23, the core 221 does not displace, so that the length of the core 221 extending into the hollow column 31 always meets the demolding requirements, preventing the core 221 from extending too far, which would cause the product 30 to deform or crack under stress.

[0043] In some embodiments, such as Figure 3 The inner wall 131 is provided with a threaded hole, and the limiting member 222 is provided with a through hole 2221 that matches the threaded hole, so that the limiting member 222 can be installed in the third cavity 13 by screws to restrict the movement of the core 221 and prevent the core 221 from extending too far into the hollow column 31. Furthermore, the process of machining the threaded hole on the inner wall 131 is relatively simple, making the fixing method of the limiting member 222 simpler and convenient for disassembly and replacement.

[0044] In some embodiments, the elastic element 23 is a spring. The first sleeve 211 moves in the direction of the product 30 and squeezes the elastic element 23. After demolding, the elastic element 23 relaxes and pushes the first sleeve 211 and the second sleeve 212 to move away from the product 30, thereby achieving reset.

[0045] It is understandable that when the injection mold 1 is in the closed state, one end of the core 221 extends into the hollow column 31 of the product 30, forming the molding space of the product 30 together with the mold cavity. After injection molding, it enters the demolding stage. The injection mold 1 is also equipped with an external demolding mechanism. The external demolding mechanism applies a driving force to the end of the first sleeve 211 away from the product 30. The first sleeve 211 moves towards the product 30 along the axis of the core assembly 22, while compressing the elastic element 23 sleeved outside the second sleeve 212. As the first sleeve... 211 drives the second sleeve 212 to move synchronously until the end of the second sleeve 212 abuts against the hollow column 31; the driving force is continued to be applied, and the second sleeve 212 pushes the hollow column 31 to move away from the inclined ejector 10, so that a gap is created between the product 30 and the inclined ejector 10, and the sleeve assembly 21 stops moving. The gap can be 1mm, 2mm or 2.5mm to avoid sticking to the mold; after demolding is completed, the external demolding mechanism removes the force, the elastic element 23 releases the compressive potential energy, and pushes the first sleeve 211 and the second sleeve 212 to move in opposite directions along the axis of the core assembly 22. When the elastic element 23 is fully extended, the first sleeve 211 and the second sleeve 212 stop moving, so that the sleeve assembly 21 is reset.

[0046] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. An injection mold with an anti-sticking device, characterized in that, The injection mold is used for injection molding a product, the product comprising a plurality of hollow pillars spaced apart, and the injection mold comprising: The inclined top has a first cavity and a second cavity that are interconnected, and the side of the inclined top facing away from the product has a first surface, and the hollow column is formed in the second cavity; An anti-sticking device is provided, which is correspondingly arranged with the hollow column and is adapted to push the hollow column. The anti-sticking device includes a sleeve assembly, a core assembly, and an elastic element. The sleeve assembly includes a first sleeve and a second sleeve connected together. A portion of the second sleeve is disposed in the second cavity. The elastic element is sleeved on the outside of the second sleeve. The first sleeve includes a sleeve head end and a sleeve tail end. The sleeve tail end protrudes relative to the first surface. The sleeve tail end is driven by a driving force, which causes the sleeve head end to compress the elastic element and drive the second sleeve to move, so that a gap exists between the product and the inclined top.

2. The injection mold as described in claim 1, characterized in that, When the sleeve assembly moves along the axial direction of the core assembly, the space occupied by the anti-sticking device in the direction perpendicular to the axial direction of the core assembly remains unchanged.

3. The injection mold as described in claim 2, characterized in that, The distance between two adjacent hollow columns is D1, and the radius of the first cavity is R1, where R1 < D1.

4. The injection mold as described in claim 3, characterized in that, The radius of the hollow column is R2, where 2R2≤R1≤6R2.

5. The injection mold as described in claim 2, characterized in that, The second sleeve has a protrusion at the end away from the hollow column, and the sleeve head end has an embedding groove adapted to the protrusion. The embedding groove is disposed through the sleeve head end in a direction perpendicular to the axis of the first sleeve.

6. The injection mold as described in claim 5, characterized in that, The second sleeve has a T-shaped cross-section along its axial direction, the embedded groove has a T-shaped cross-section, the protrusion has a first abutting surface, and the embedded groove has a first mating surface that abuts against the first abutting surface, so as to restrict the second sleeve from moving away from the embedded groove along its own axial direction.

7. The injection mold as described in claim 1, characterized in that, The other end of the first sleeve is provided with a guide groove along the axial direction of the first sleeve. The core assembly is sequentially inserted into the first sleeve and the second sleeve. The core assembly includes a core that is interlocked with each other and a limiting member. The limiting member is disposed in the guide groove and abuts against the end of the guide groove.

8. The injection mold as described in claim 7, characterized in that, One end of the core extends into the hollow column of the product, and the other end of the core is provided with a slot, into which the limiting member is embedded.

9. The injection mold as described in claim 8, characterized in that, The inclined top is also provided with a third cavity, which is connected to the first cavity and is adapted to accommodate the limiting member. The limiting member abuts against the inner wall of the third cavity to restrict the core from moving along its own axis toward the direction of the product.

10. The injection mold according to any one of claims 1-9, characterized in that, The elastic element is a spring.

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