Injection mold for a plastic article with a perforated cover

Abstract

The utility model discloses a kind of injection mould of hole buckle cover plastic product, including fixed mould plate and the movable mould plate being movably arranged at the top of fixed mould plate, the top surface of the fixed mould plate is embedded with lower mould core, the top surface of the lower mould core is formed with the convex die of upward bulge, the bottom surface of the movable mould plate is embedded with upper mould core, the bottom surface of the upper mould core is formed with recess, the lower mould core, convex die, upper mould core and recess are formed with the cavity of accommodating buckle cover plastic piece, the top surface of the fixed mould plate is sequentially provided with several movable sliding module in circumferential direction on the circumferential side of lower mould core, the sliding module is connected with the first insert piece and second insert piece of abutting on the side wall of convex die, the extension direction of the first insert piece is angle setting with the extension direction of second insert piece, the fixed mould plate is below being provided with ejection assembly. The utility model does not need to set up oil cylinder and other structures, and the specific gravity of mould is small, compact structure, manufacturing cost is low, maintenance cost is low.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold for a plastic product with a perforated cap. Background Technology

[0002] Plastic snap-on covers are widely used in daily life, typically as casings for electronic products. These products are usually made by injection molding, where material is injected into a mold to form the casing, and then demolded after molding for easy removal. However, because these products require through-holes of varying numbers and sizes on the periphery of the snap-on cover, and the formation of these through-holes depends on the fit between the through-hole insert and the inner mold, the through-hole insert is not easy to detach from the snap-on cover during demolding. It requires manual removal or multiple side-pulling demolding mechanisms to pull the through-hole insert out of the snap-on cover in different directions before the product can be removed.

[0003] However, each of the above-mentioned side core-pulling demolding mechanisms requires the configuration of hydraulic cylinders and related sliding components. The more through holes there are on the cover, the more hydraulic cylinders and sliding components are required, which will lead to a larger mold volume, a more complex mold structure, and higher manufacturing costs. In addition, the hydraulic cylinder has many pipes, which are prone to failure, oil leakage, and troublesome maintenance. Utility Model Content

[0004] The purpose of this utility model is to provide an injection mold for plastic products with perforated caps, which does not require the setting of hydraulic cylinders or other structures. The mold is small in size, compact in structure, low in manufacturing cost, and low in maintenance cost, thereby solving the problems of large mold size, complex mold structure, and high manufacturing cost of cap-type plastic products mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An injection mold for a plastic product with a perforated cap includes a fixed mold plate and a movable mold plate movably disposed on the top of the fixed mold plate. A lower mold core is embedded in the top surface of the fixed mold plate, and a punch protruding upward is formed on the top surface of the lower mold core. An upper mold core is embedded in the bottom surface of the movable mold plate, and a groove is formed on the bottom surface of the upper mold core. A cavity for accommodating the cap plastic product is formed between the lower mold core, the punch, the upper mold core, and the groove. Several movable sliding modules are sequentially arranged along the circumferential direction on the top surface of the fixed mold plate around the lower mold core. The sliding modules are connected to a first insert and a second insert that abut against the side wall of the punch. The extension direction of the first insert and the extension direction of the second insert are set at an angle. An ejection assembly is disposed below the fixed mold plate.

[0007] Preferably, the sliding module includes two limiting blocks, a slider, and a push rod. The two limiting blocks are disposed opposite to each other on the top surface of the fixed template. The slider is movably disposed between the two limiting blocks. The first insert and the second insert are respectively installed on one end face of the slider. The top of the slider has an inclined hole that extends to its bottom surface. One end of the push rod is connected upward to the bottom end of the moving template, and the other end is movably inserted downward into the inclined hole.

[0008] Preferably, the first insert includes a mounting block and a plurality of hole shafts. The mounting block is inclinedly disposed on the side of the slider facing the punch. The plurality of hole shafts are arranged in a square array at equal intervals on the end face of the mounting block facing the punch. The ends of the plurality of hole shafts away from the mounting block abut against the outer wall of the punch.

[0009] Preferably, the slider has a slanted groove on the side facing the punch, and the extension direction of the slanted groove is inclined to the end face of the slider; the mounting block is L-shaped, one end of the mounting block is embedded in the slanted groove, and the other end is inclined relative to the slider and facing the punch.

[0010] Preferably, the second insert includes a fixing block and a convex shaft. The fixing block is disposed on the side of the slider facing the punch, and one end of the convex shaft is inserted into the fixing block, while the other end abuts against the outer wall of the punch.

[0011] Preferably, the slider has a T-slot on its side facing the punch, and the T-slot extends perpendicularly to the end face of the slider; one end of the fixing block forms a T-shaped connecting part, which is embedded in the T-slot.

[0012] Preferably, the upper mold core has a first clearance groove and a second clearance groove on its side, and the length direction of the second clearance groove is inclined to the length direction of the first clearance groove.

[0013] Preferably, the bottom end of the fixed template is connected to two side plates, and the bottom ends of the two side plates are connected to a base plate, forming an movable space between the fixed template, the two side plates, and the base plate.

[0014] Preferably, the ejection assembly includes an ejector plate, a straight ejector pin, and an angled ejector structure. The ejector plate is movably disposed within the movable space. The straight ejector pin is upright disposed on the ejector plate. The top end of the straight ejector pin passes upward through the fixed template and extends to the top wall of the punch. The angled ejector structure is disposed on the ejector plate.

[0015] Preferably, the inclined ejector structure includes an inclined ejector base, a guide block, and an inclined ejector rod. The inclined ejector base is fixed to the top surface of the ejector plate. A horizontally extending guide groove is provided on the top surface of the inclined ejector base. The guide block is installed on the bottom surface of the fixed template. The guide block has an inclined limiting hole. The bottom end of the inclined ejector rod is movably disposed in the guide groove in a horizontal direction. The top end of the inclined ejector rod is inclined upward, passes through the limiting hole and the fixed template, and extends to the top wall of the punch.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: After mold opening, several sliding modules on the periphery of the lower mold core respectively drive the first insert and the second insert to disengage from the punch and the cover plastic part, thereby exposing the cover plastic part; then, the cover plastic part is ejected from the punch by the ejection assembly, completing the demolding action. The whole process has fewer demolding steps and higher demolding efficiency; and there is no need to set up complex structures such as oil cylinders in the mold, which makes the mold volume smaller and the structure more compact, thereby reducing the manufacturing cost of the mold, and there will be no oil leakage; during maintenance, the entire sliding module or a single first insert or second insert can be replaced, making maintenance simple and cost-effective. Attached Figure Description

[0017] Figure 1 This is a perspective view of an injection mold for a plastic product with a perforated buckle cap according to the present invention.

[0018] Figure 2 This is a cross-sectional view of an injection mold for a plastic product with a perforated buckle cap according to this utility model.

[0019] Figure 3 This is a cross-sectional view of the injection mold of a plastic product with a perforated buckle according to this utility model after mold opening;

[0020] Figure 4 This is a perspective view of the moving template of this utility model;

[0021] Figure 5 This is a perspective view of the template and sliding module of this utility model;

[0022] Figure 6 This is a perspective view of the sliding module of this utility model;

[0023] Figure 7 A perspective view of the template for this utility model;

[0024] Figure 8 This is a perspective view of the ejector assembly of this utility model;

[0025] Figure 9 This is a perspective view of the sloping top structure of this utility model.

[0026] The corresponding reference numerals in the attached drawings are as follows: 1. Fixed mold plate; 2. Moving mold plate; 3. Lower mold core; 31. Punch; 4. Upper mold core; 41. Groove; 42. First clearance groove; 43. Second clearance groove; 5. Sliding module; 51. Limiting block; 52. Slider; 521. Angled hole; 522. Angled groove; 523. T-slot; 53. Push rod; 6. First insert; 61. Mounting block; 62. Hole shaft; 7. Second insert; 71. Fixing block; 72. Punch shaft; 8. Ejector assembly; 81. Ejector plate; 82. Straight ejector pin; 83. Angled ejector structure; 831. Angled ejector base; 832. Guide block; 833. Angled ejector rod; 834. Guide groove; 835. Limiting hole; 9. Guide rod; 10. Guide hole; 11. Side plate; 12. Base plate; 13. Cover plastic part. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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 therefore should not be construed as a limitation of this utility model. 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 indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "more than" means two or more, unless otherwise explicitly specified. In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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.

[0029] Please see Figure 1-9 An injection mold for a plastic product with a perforated cap includes a fixed mold plate 1 and a movable mold plate 2 movably disposed on the top of the fixed mold plate 1. A lower mold core 3 is embedded in the top surface of the fixed mold plate 1. (See also...) Figure 2-4 The lower mold core 3 has an upwardly protruding punch 31 on its top surface. The moving mold plate 2 has an upper mold core 4 embedded in its bottom surface, and the bottom surface of the upper mold core 4 has a groove 41. A cavity for accommodating the snap-on plastic part 13 is formed between the lower mold core 3, the punch 31, the upper mold core 4, and the groove 41. (See also...) Figure 5 The top surface of the fixed template 1 is provided with a plurality of movable sliding modules 5 arranged in a circumferential direction around the lower mold core 3. The sliding modules 5 are connected to a first insert 6 and a second insert 7 that abut against the side wall of the punch 31. The extension direction of the first insert 6 and the extension direction of the second insert 7 are set at an angle. The fixed template 1 is provided with an ejection assembly 8 for ejecting the cover plastic part 13 from the punch 31.

[0030] Please see Figure 3 After the moving template 2 moves upward relative to the fixed template 1 to open the mold, several sliding modules 5 on the periphery of the lower mold core 3 respectively drive the first insert 6 and the second insert 7 to disengage from the punch 31 and the cover plastic part 13, thereby exposing the cover plastic part 13; then the ejector assembly 8 ejects the cover plastic part 13 from the punch 31, completing the demolding action. The entire demolding process has few steps and high demolding efficiency; and there is no need to set up complex structures such as oil cylinders in the mold, which makes the mold volume smaller and the structure more compact, thereby reducing the manufacturing cost of the mold, and there will be no oil leakage; during maintenance, the entire sliding module 5 or a single first insert 6 or second insert 7 can be replaced, making maintenance simple and cost-effective.

[0031] Please see Figure 4-6 The sliding module 5 includes two limiting blocks 51, a slider 52, and a push rod 53. The two limiting blocks 51 are disposed opposite each other on the top surface of the fixed template 1. The slider 52 is movably disposed between the two limiting blocks 51. The first insert 6 and the second insert 7 are respectively installed on one end face of the slider 52. The top of the slider 52 has an inclined hole 521 extending to its bottom surface. One end of the push rod 53 is connected upward to the bottom end of the moving template 2, and the other end is movably inserted downward into the inclined hole 521. In this embodiment, the cross-sections of the push rod 53 and the inclined hole 521 are square. However, this utility model does not limit the shape of the push rod 53 and the inclined hole 521. The cross-sectional shape of the push rod 53 and the inclined hole 521 can also be circular or other geometric shapes.

[0032] Please see Figure 3When the mold is opened, the moving platen 2 moves upward relative to the fixed platen 1. The moving platen 2 drives the push rod 53 to move upward. During the upward movement, the push rod 53 presses against the inner wall of the inclined hole 521 through its side, thereby driving the slider 52 to move away from the lower mold core 3, so that the first insert 6 and the second insert 7 simultaneously disengage from the punch 31 and the cover plastic part 13, thereby completing the initial demolding. Then, the cover plastic part 13 is ejected from the punch 31 of the lower mold core 3 by the ejector assembly 8.

[0033] Please refer to Figure 4-5 Guide rods 9 are provided at the four corners of the bottom surface of the moving template 2, and guide holes 10 adapted to the guide rods 9 are provided at the four corners of the top surface of the fixed template 1. When the mold is opened and closed, the moving template 2 moves more stably through the cooperation of the guide rods 9 and the guide holes 10.

[0034] Please see Figure 6 The first insert 6 includes a mounting block 61 and a plurality of hole shafts 62. The mounting block 61 is inclinedly disposed on the side of the slider 52 facing the punch 31. The plurality of hole shafts 62 are arranged in a square array at equal intervals on the end face of the mounting block 61 facing the punch 31. The ends of the plurality of hole shafts 62 away from the mounting block 61 abut against the outer wall of the punch 31, for cooperating with the punch 31 and the groove 41 to form the through hole of the cover plastic part 13.

[0035] The slider 52 has a slanted groove 522 on its side facing the punch 31, and the extension direction of the slanted groove 522 is inclined to the end face of the slider 52. The mounting block 61 is L-shaped, with one end embedded in the slanted groove 522 and the other end inclined relative to the slider 52 towards the punch 31. When the slider 52, mounting block 61, and hole shaft 62 are all or partially scrapped, they can all be quickly removed from the fixed template 1. The operation is simple, the maintenance is convenient, and the maintenance cost is low.

[0036] The second insert 7 includes a fixing block 71 and a convex shaft 72. The fixing block 71 is disposed on the side of the slider 52 facing the punch 31 and located on the side of the mounting block 61. One end of the convex shaft 72 is inserted into the fixing block 71, and the other end abuts against the outer wall of the punch 31. It is used to cooperate with the punch 31 and the groove 41 to form another through hole of the cover plastic part 13.

[0037] The slider 52 has a T-slot 523 on its side facing the punch 31, and the T-slot 523 extends perpendicularly to the end face of the slider 52. One end of the fixing block 71 forms a T-shaped connecting part, which is embedded in the T-slot 523. When the slider 52, fixing block 71, and punch 72 are all or partially scrapped, they can all be quickly removed from the fixed template 1; or when producing different specifications of snap-on plastic parts 13, different specifications of punch 72 or hole shaft 62 can be quickly replaced, which is beneficial to improving production efficiency and has strong versatility.

[0038] Please see Figure 4-6 The upper mold core 4 has a first clearance groove 42 and a second clearance groove 43 on its side. The length direction of the second clearance groove 43 is inclined to the length direction of the first clearance groove 42. The mounting block 61 is accommodated in the first clearance groove 42 and the fixing block 71 is accommodated in the second clearance groove 43.

[0039] Please see Figure 7-8 The fixed template 1 has two side plates 11 connected to its bottom end, and a base plate 12 connected to the bottom end of each side plate 11. The fixed template 1, the two side plates 11, and the base plate 12 form a movable space. The ejector assembly 8 includes an ejector plate 81, a straight ejector pin 82, and an inclined ejector structure 83. The ejector plate 81 is movably disposed within the movable space. The straight ejector pin 82 is upright disposed on the ejector plate 81, with its tip extending upward through the fixed template 1 and reaching the top wall of the punch 31. The inclined ejector structure 83 is disposed on the ejector plate 81 and is used to cooperate with the straight ejector pin 82 to eject the cap plastic part 13 on the punch 31. The base plate 12 is provided with a power device for driving the ejector plate 81 to rise and fall. In this embodiment, the power device is a cylinder.

[0040] Please see Figure 9 The inclined top structure 83 includes an inclined top base 831, a guide block 832, and an inclined top rod 833. The inclined top base 831 is fixed to the top surface of the ejector plate 81. The top surface of the inclined top base 831 has a horizontally extending guide groove 834. The guide block 832 is installed on the bottom surface of the fixed template 1. The guide block 832 has an inclined limiting hole 835. The bottom end of the inclined top rod 833 is movably disposed in the guide groove 834 in a horizontal direction. The top end of the inclined top rod 833 is inclined upward, passes through the limiting hole 835 and the fixed template 1, and extends to the top wall of the punch 31.

[0041] In this embodiment, the bottom of the cover plastic part 13 has an undercut structure (not shown in the figure), which needs to be pushed out by the inclined ejector rod 833. After the several sliding modules 5 respectively drive the first insert 6 and the second insert 7 to disengage from the punch 31 and the cover plastic part 13, the power device drives the ejector plate 81 to move upward, and the straight ejector 82 pushes the cover plastic part 13 on the punch 31 upward in the vertical direction. At the same time, the inclined ejector rod 833 cooperates with the straight ejector 82 in the oblique upward direction to push the cover plastic part 13 on the punch 31 upward, so that the inclined ejector rod 833 separates from the undercut structure of the cover plastic part 13. During the upward pushing process, the bottom end of the inclined ejector rod 833 moves horizontally along the length of the guide groove 834.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection mold for a plastic product with a perforated cap, comprising a fixed template (1) and a movable template (2) movably disposed at the top of the fixed template (1), wherein a lower mold core (3) is embedded in the top surface of the fixed template (1), characterized in that: The lower mold core (3) has an upwardly protruding punch (31) on its top surface. The upper mold core (4) is embedded in the bottom surface of the moving template (2). The bottom surface of the upper mold core (4) has a groove (41). A cavity for accommodating the cover plastic part (13) is formed between the lower mold core (3), the punch (31), the upper mold core (4), and the groove (41). Several movable sliding modules (5) are arranged sequentially along the circumferential direction on the top surface of the fixed template (1) around the lower mold core (3). The sliding modules (5) are connected to a first insert (6) and a second insert (7) that abut against the side wall of the punch (31). The extension direction of the first insert (6) and the extension direction of the second insert (7) are set at an angle. An ejector assembly (8) is provided below the fixed template (1).

2. The injection mold for the perforated cap plastic product according to claim 1, characterized in that: The sliding module (5) includes two limiting blocks (51), a slider (52) and a push rod (53). The two limiting blocks (51) are arranged opposite to each other on the top surface of the fixed template (1). The slider (52) is movably arranged between the two limiting blocks (51). The first insert (6) and the second insert (7) are respectively installed on one end face of the slider (52). The top of the slider (52) has an inclined hole (521) that extends to its bottom surface. One end of the push rod (53) is connected upward to the bottom end of the moving template (2), and the other end is inserted downward into the inclined hole (521).

3. The injection mold for the perforated cap plastic product according to claim 2, characterized in that: The first insert (6) includes a mounting block (61) and a plurality of hole shafts (62). The mounting block (61) is inclinedly disposed on the side of the slider (52) facing the punch (31). The plurality of hole shafts (62) are arranged in a square array at equal intervals on the end face of the mounting block (61) facing the punch (31). The end of the plurality of hole shafts (62) away from the mounting block (61) abuts against the outer wall of the punch (31).

4. The injection mold for the perforated cap plastic product according to claim 3, characterized in that: The slider (52) has a slanted groove (522) on its side facing the punch (31), and the extension direction of the slanted groove (522) is inclined to the end face of the slider (52); the mounting block (61) is L-shaped, with one end of the mounting block (61) embedded in the slanted groove (522) and the other end inclined relative to the slider (52) towards the punch (31).

5. The injection mold for the perforated cap plastic product according to claim 2, characterized in that: The second insert (7) includes a fixing block (71) and a cam (72). The fixing block (71) is disposed on the side of the slider (52) facing the punch (31). One end of the cam (72) is inserted into the fixing block (71), and the other end abuts against the outer wall of the punch (31).

6. The injection mold for the plastic product with a perforated buckle cap according to claim 5, characterized in that: The slider (52) has a T-slot (523) on the side facing the punch (31), and the T-slot (523) extends perpendicularly to the end face of the slider (52); one end of the fixing block (71) forms a T-shaped connecting part, which is embedded in the T-slot (523).

7. The injection mold for the plastic product with a perforated buckle according to claim 2, characterized in that: The upper mold core (4) has a first clearance groove (42) and a second clearance groove (43) on its side, and the length direction of the second clearance groove (43) is inclined to the length direction of the first clearance groove (42).

8. The injection mold for the perforated snap-on plastic product according to any one of claims 1-7, characterized in that: The bottom end of the fixed template (1) is connected to two side plates (11), and the bottom end of the two side plates (11) is connected to a bottom plate (12). The fixed template (1), the two side plates (11) and the bottom plate (12) form an active space.

9. The injection mold for the plastic product with a perforated buckle cap according to claim 8, characterized in that: The ejector assembly (8) includes an ejector plate (81), a straight ejector pin (82), and an inclined ejector structure (83). The ejector plate (81) is movably disposed within the movable space. The straight ejector pin (82) is upright disposed on the ejector plate (81). The top end of the straight ejector pin (82) passes upward through the fixed template (1) and extends to the top wall of the punch (31). The inclined ejector structure (83) is disposed on the ejector plate (81).

10. The injection mold for the perforated cap plastic product according to claim 9, characterized in that: The inclined top structure (83) includes an inclined top base (831), a guide block (832), and an inclined top rod (833). The inclined top base (831) is fixed on the top surface of the ejector plate (81). The top surface of the inclined top base (831) is provided with a horizontally extending guide groove (834). The guide block (832) is installed on the bottom surface of the fixed template (1). The guide block (832) is provided with an inclined limiting hole (835). The bottom end of the inclined top rod (833) is movably disposed in the guide groove (834) in the horizontal direction. The top end of the inclined top rod (833) is inclined upward, passes through the limiting hole (835) and the fixed template (1), and extends to the top wall of the punch (31).

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