Demolding mechanism and injection mold with same

Abstract

The utility model relates to the technical field of injection molding, in particular to a demolding mechanism and an injection mold with the demolding mechanism, the demolding mechanism comprises a mold core and a pitched roof movably arranged on the mold core, the pitched roof is provided with a barb groove used for forming at least one part of a cavity, and the demolding mechanism further comprises an ejection assembly, the ejection assembly is movably arranged on the inclined ejector, the ejection assembly comprises an ejection part arranged at the tail end of the ejection assembly, and the ejection part is selectively switched between an ejection position and an injection molding position by means of movement of the ejection assembly. When the ejection assembly is located at the injection molding position, one part, forming the groove wall of the barb groove, of the ejection assembly forms one part of the side wall of the cavity, and injection molding of the injection mold is not affected; when the ejection assembly is located at the ejection position, thrust is applied to the product formed in the barb groove, so that adhesion between the product and the barb groove is reduced, and the product is prevented from being deformed or broken during demolding.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a demoulding mechanism and an injection mold with the demoulding mechanism. Background Art

[0002] The ejector is a mechanism used in injection molds to form internal hooks in products. For larger products that are molded within or completely enclosed within the ejector, the adhesion between the product and the ejector is strong, making demolding more difficult. In existing injection molds, during demolding, the ejector moves outward and diagonally ejects the product, but the product can stick to the ejector. Forcibly removing the product from the mold can cause deformation or breakage. Summary of the Invention

[0003] The purpose of the utility model is to provide a demoulding mechanism and an injection mold with the demoulding mechanism, which is suitable for injection molded products with a large number or all structures formed in a slanted top, so as to solve the above-mentioned problem that such injection molded products are difficult to demould.

[0004] To achieve the above objectives, the technical solution of the present utility model includes:

[0005] A demolding mechanism includes a mold core and a slanted top movably arranged on the mold core, the slanted top being provided with an undercut groove for forming at least a portion of a mold cavity, and also includes an ejection assembly, the ejection assembly being movably arranged on the slanted top, the ejection assembly including an ejection portion arranged at its end, the ejection portion selectively switching between an ejection position and an injection position by means of the movement of the ejection assembly, the ejection position being that the ejection portion protrudes from the undercut groove wall for ejecting a product molded in the undercut groove, and the injection position being that the ejection portion retracts to the undercut groove wall for forming a portion of the undercut groove wall.

[0006] In one embodiment, the ejection assembly includes an elastic pin slidably arranged on the inclined ejector, and one end of the elastic pin forms the ejection portion.

[0007] In one embodiment, the inclined ejector moves in a demolding direction or a backward direction opposite to the mold core, and the mold core is provided with an ejection surface, and an included angle is formed between the ejection surface and the demolding direction of the inclined ejector. The end of the spring pin away from the ejection portion is a driving end, and the driving end of the spring pin is used to abut against the ejection surface. As the inclined ejector moves in the demolding direction, the spring pin is switched from the injection position to the ejection position under the limiting action of the ejection surface.

[0008] In one embodiment, the inclined ejector includes a main body and a limiting member, the undercut groove is arranged on a side wall of the main body, and an accommodating cavity is provided between the main body and the limiting member. The ejection assembly also includes an elastic member, the elastic member is arranged in the accommodating cavity and one end of the elastic member is against the main body, the elastic needle is provided with an abutting surface, and the other end of the elastic member is against the abutting surface of the elastic needle. The elastic force direction of the elastic member is the same as the direction of the elastic needle moving from the ejection position to the injection position.

[0009] In one embodiment, the elastic member is a spring, the elastic needle passes through the spring, and the end of the spring abuts against the abutting surface.

[0010] In one embodiment, the mold core is further provided with a reset surface connected to the ejection surface, and the reset surface and the ejection surface are arranged in sequence along the demolding direction of the inclined top, and a reset cavity is formed between the reset surface and the inclined top, and the reset cavity is used to accommodate the driving end of the spring pin.

[0011] In one embodiment, the ejection surface and the reset surface are both planes, and along the demoulding direction of the inclined top, the ejection surface gradually approaches the inclined top, and the reset surface gradually moves away from the inclined top.

[0012] In one embodiment, the inclined ejector includes a main body and a limiting member, the hook groove is arranged on a side wall of the main body, the end of the spring pin away from the ejection part is the driving end, the driving end and the ejection part of the spring pin are respectively slidably passed through the limiting member and the main body, and the spring pin is provided with a limiting surface, which is used to abut against the limiting member, thereby limiting the distance that the spring pin moves in the direction away from the ejection position.

[0013] The technical solution of the utility model also includes:

[0014] An injection mold comprises the above-mentioned demoulding mechanism.

[0015] The beneficial effects of the present invention are as follows: the ejector assembly disposed on the inclined top can switch between an ejection position and an injection position. When the ejector assembly is in the injection position, it forms a portion of the undercut groove wall, i.e., a portion of the cavity side wall, without affecting the injection molding of the injection mold; when the ejector assembly is in the ejection position, it exerts a thrust on the product molded in the undercut groove, thereby reducing adhesion between the product and the undercut groove and preventing deformation or breakage of the product during demolding. Furthermore, the end of the spring pin serves as the ejection portion, while the other end serves as the driving end. The movement of the inclined top is utilized to synchronously move the spring pin, and a spring is utilized to reset the pin. This eliminates the need for multiple power sources, simplifies control, and allows for more precise timing of the pin movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of an embodiment of the present utility model.

[0017] Figure 2 It is a structural diagram of the main body of the inclined roof in an embodiment of the present utility model.

[0018] Figure 3 It is a cross-sectional view of an embodiment of the present invention, wherein the ejection assembly is located in the injection molding position.

[0019] Figure 4 It is a cross-sectional view of an embodiment of the present invention, wherein the ejection assembly is in the ejection position.

[0020] Figure 5 It is a cross-sectional view of an embodiment of the present invention, wherein the inclined top is located at the position where the injection molded part is demoulded.

[0021] Among them: 1 inclined ejector, 101 undercut groove, 102 accommodating cavity, 11 main body, 12 limiting member, 2 ejection assembly, 21 spring pin, 211 ejection part, 212 driving end, 213 top surface, 214 limiting surface, 22 spring, 3 mold core, 31 ejection surface, 32 reset surface, 320 reset cavity, X1 demoulding direction, X2 retreat direction. DETAILED DESCRIPTION

[0022] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0023] See Figures 1 to 4 As shown, the utility model discloses a demoulding mechanism, including a slanted ejector 1, an ejector assembly 2 and a mold core 3. The slanted ejector 1 is movably arranged on the mold core 3 and is provided with an undercut groove 101 for forming at least a portion of the mold cavity. The ejector assembly 2 is movably arranged on the slanted ejector 1 and includes an ejector portion 211 arranged at its end. The ejector portion 211 selectively switches between an ejection position and an injection position by means of the movement of the ejector assembly 2. The ejection position refers to the ejector portion 211 protruding from the wall of the undercut groove 101 to eject the product molded in the undercut groove 101. The injection position refers to the ejector portion 211 retracting to the wall of the undercut groove 101 to form a portion of the wall of the undercut groove 101.

[0024] Among them, the product molded in the undercut groove 101 of the present invention refers to the part of the injection molded part molded in the undercut groove 101, which is not limited to the entire structure of the injection molded part molded in the undercut groove 101, but also includes a part of the structure of the injection molded part molded in the undercut groove 101, and the structure molded in the undercut groove 101 is, for example, the undercut of the injection molded part.

[0025] Because the ejector assembly 2, mounted on the inclined ejector 1, can switch between an ejection position and an injection position, when the ejector assembly 2 is in the injection position, its ejector portion 211 retracts to the wall of the undercut groove 101, forming a portion of the wall of the undercut groove 101, and thus forming a portion of the side wall of the cavity, without affecting the injection molding of the injection mold. When the ejector assembly 2 is in the ejection position, it exerts a thrust on the product molded in the undercut groove 101, reducing its adhesion to the undercut groove and preventing deformation or breakage of the product during demolding.

[0026] The inclined ejector 1 moves relative to the mold core 3 along the opposite demoulding direction X1 or the backward direction X2. When the inclined ejector 1 moves along the demoulding direction X1, the injection molded part in the mold cavity is ejected for demoulding. When the inclined ejector 1 moves along the backward direction X2, the inclined ejector 1 returns to its original position and cooperates with the mold core to form a mold cavity for injection molding. Figure 5 The inclined top 1 shown is moved along the demoulding direction X1 to a position that facilitates demoulding of the injection molded part. Figure 3 The lifter 1 shown is moved along the retreat direction X2 to a position convenient for injection molding. The driving mechanism for driving the lifter 1 along the demoulding direction X1 or the retreat direction X2 is not shown in the figure. The driving mechanism is prior art and will not be described here.

[0027] See Figures 3 to 5 As shown, the ejector assembly 2 includes a spring pin 21 and a spring 22 that are slidably mounted on the lifter 1. One end of the spring pin 21 forms an ejection portion 211, and the other end forms a driving end 212. The mold core 3 is provided with an ejection surface 31, which is angled with the demolding direction X1 of the lifter 1. The driving end 212 of the spring pin 21 is used to abut against the ejection surface 31. As the lifter 1 moves toward the demolding direction X1, the spring pin 21 switches from the injection position to the ejection position under the restraining action of the ejection surface 31.

[0028] To facilitate the installation of the spring pin 21 and the spring 22, the inclined ejector 1 includes a body 11 and a stopper 12. A hook groove 101 is provided on a side wall of the body 11. A receiving cavity 102 is provided between the body 11 and the stopper 12. The spring 22 is disposed within the receiving cavity 102. Thus, the driving end 212 and the ejection portion 211 of the spring pin 21 slide through the stopper 12 and the body 11, respectively. The spring pin 21 is provided with a top contact surface 213. The spring pin 21 passes through the spring 22. One end of the spring 22 abuts against the body 11, and the other end abuts against the top contact surface 213 of the spring pin 21. The direction of the spring force is the same as the direction in which the spring pin 21 moves from the ejection position to the injection position. Therefore, when the spring pin 21 is not limited by the ejection surface 31, it can move toward the injection position under the elastic force of the spring 21. The spring pin 21 is further provided with a limiting surface 214, which is used to abut the limiting member 12, thereby limiting the distance the spring pin 21 can move away from the ejection position. In this embodiment, when the limiting surface 214 abuts the limiting member 12, the driving end 212 of the spring pin 21 exactly abuts the ejection surface 31, thereby further limiting the spring pin 21. In other embodiments, when the driving end 212 of the spring pin 21 abuts the ejection surface 31, the limiting surface 214 can be a certain distance from the limiting member 12, so that the limiting surface 214 acts as a limiter when the spring pin 21 leaves the ejection surface 31, preventing the spring pin 21 from escaping the inclined ejector 1.

[0029] In addition to the spring 21 , other elastic members may be used to move the spring pin 21 from the ejection position to the injection position, such as a silicone sleeve with its two ends respectively resting against the body 11 and the top surface 213 . In this case, the movement distance of the spring pin 21 is relatively small.

[0030] The mold core 3 is also provided with a reset surface 32 connected to the ejection surface 31. The reset surface 32 and the ejection surface 31 are arranged in sequence along the demolding direction X1 of the inclined ejector 1. A reset cavity 320 is formed between the reset surface 32 and the inclined ejector 1. The reset cavity 320 is used to accommodate the driving end 212 of the spring pin 21. The presence of the reset surface 32, on the one hand, allows the spring pin 21 to move from the ejection position to the injection position in a timely manner, preventing the ejection portion 211 of the spring pin 21 from pressing against the product for too long and causing local stress deformation of the product. On the other hand, when the inclined ejector 1 moves in the backward direction from the position where the injection molded part is demolded, the driving end 212 protruding from the inclined ejector 1 can have space to accommodate and gradually transition to the ejection surface 31 along the reset surface 32, preventing the driving end 212 of the spring pin 21 from hitting the mold core 3.

[0031] In this embodiment, both the ejection surface 31 and the reset surface 32 are plane surfaces. Along the demolding direction X1 of the inclined ejector 1, the ejection surface 31 gradually approaches the inclined ejector 1, while the reset surface 32 gradually moves away from the inclined ejector 1. In other embodiments, the ejection surface 31 and the reset surface 32 may also be curved or irregular surfaces, as long as they can meet the movement trend of the spring pin 21.

[0032] In the above-described embodiment, the spring pin 21 is linked to the inclined ejector 1. The movement of the inclined ejector 1 and the positional limit of the ejection surface of the mold core enable the spring pin 21 to switch from the injection position to the ejection position, thereby facilitating the ejection of the product within the undercut groove 101. The spring force also enables the spring pin 21 to return from the ejection position to the injection position. The overall structure is simple, and there is no need for a separate power source to drive the movement of the spring pin 21. The linkage between the spring pin 21 and the inclined ejector 1 makes the movement of the spring pin 21 more precise and reliable.

[0033] In other embodiments, the movement of the spring needle 21 can also be achieved by providing a separate power source. Each power source can only control the unidirectional movement of the spring needle 21 (switching from the injection position to the ejection position or from the ejection position to the injection position), or can control the bidirectional movement of the spring needle 21 (reciprocating movement between the injection position and the ejection position). The power source is, for example, a motor or a cylinder.

[0034] The working process of this utility model is:

[0035] See Figures 3 to 5 As shown, when the inclined ejector 1 moves along the demoulding direction X1, the driving end 212 of the spring pin 21 abuts against the ejection surface 31 and the reset surface 32 in sequence, and the spring pin 21 gradually moves from the injection position to the ejection position, so that the product formed in the undercut groove 101 is separated from the undercut groove 101 by a certain distance, thereby releasing the adhesion between the product and the inner wall of the undercut groove 101; and then, under the elastic force of the spring 21 and the yielding action of the reset cavity 320, the spring pin 21 gradually moves from the ejection position to the injection position until the limiting surface 214 of the spring pin 21 abuts against the limiting member 12.

[0036] When the lifter 1 moves along the backward direction X2, the driving end 212 of the spring needle 21 abuts against the reset surface 32 and the ejection surface 31 in sequence, and the spring needle 21 gradually moves from the injection position to the ejection position and then moves back to the injection position to prepare for the next injection.

[0037] In addition, the present invention also provides an injection mold having the above-mentioned demoulding mechanism. The above-mentioned mold core can be a male mold core or a female mold core, and its specific setting position is set by those skilled in the art according to the actual requirements of the injection mold.

[0038] Although the present invention is specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that the remaining undescribed parts are prior art, and that various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined by the appended claims fall within the scope of protection of the present invention.

Claims

1. A demoulding mechanism comprising a mold core and a sloping top movably disposed on the mold core, wherein the sloping top is provided with an undercut groove for forming at least a portion of a mold cavity, characterized in that: It also includes an ejector assembly, which is movably arranged on the inclined ejector. The ejector assembly includes an ejector portion arranged at its end. The ejector portion selectively switches between an ejection position and an injection position by means of the movement of the ejector assembly. The ejector position refers to the ejector portion protruding from the undercut groove wall to eject the product molded in the undercut groove. The injection position refers to the ejector portion retracting to the undercut groove wall to form a part of the undercut groove wall.

2. A demoulding mechanism according to claim 1, characterized in that: The ejection assembly includes an elastic pin slidably arranged on the inclined ejector, and one end of the elastic pin forms the ejection portion.

3. A demoulding mechanism according to claim 2, characterized in that: The inclined ejector moves in a demoulding direction or a backward direction opposite to the mold core. The mold core is provided with an ejection surface. The ejection surface forms an angle with the demoulding direction of the inclined ejector. The end of the spring pin away from the ejection portion is a driving end. The driving end of the spring pin is used to abut against the ejection surface. As the inclined ejector moves in the demoulding direction, the spring pin is switched from the injection position to the ejection position under the limiting action of the ejection surface.

4. A demoulding mechanism according to claim 3, characterized in that: The inclined ejector includes a body and a limiting member, the undercut groove is arranged on a side wall of the body, and an accommodating cavity is provided between the body and the limiting member. The ejection assembly also includes an elastic member, the elastic member is arranged in the accommodating cavity and one end of the elastic member is against the body, the elastic needle is provided with an abutting surface, and the other end of the elastic member is against the abutting surface of the elastic needle. The elastic force direction of the elastic member is the same as the direction of movement of the elastic needle from the ejection position to the injection position.

5. A demoulding mechanism according to claim 4, characterized in that: The elastic member is a spring, the elastic needle passes through the spring, and the end of the spring abuts against the abutting surface.

6. A demoulding mechanism according to claim 3, characterized in that: The mold core is also provided with a reset surface connected to the ejection surface. The reset surface and the ejection surface are arranged in sequence along the demoulding direction of the inclined top. A reset cavity is formed between the reset surface and the inclined top. The reset cavity is used to accommodate the driving end of the elastic pin.

7. A demoulding mechanism according to claim 6, characterized in that: The ejection surface and the reset surface are both planes. Along the demoulding direction of the inclined top, the ejection surface gradually approaches the inclined top, and the reset surface gradually moves away from the inclined top.

8. The demoulding mechanism according to claim 2, characterized in that: The inclined ejector includes a body and a limiting member, the undercut groove is arranged on a side wall of the body, the end of the spring pin away from the ejection part is the driving end, the driving end and the ejection part of the spring pin are slidably penetrated through the limiting member and the body respectively, and the spring pin is provided with a limiting surface, which is used to abut against the limiting member, thereby limiting the distance that the spring pin moves in the direction away from the ejection position.

9. An injection mold, characterized in that: The injection mold has the demoulding mechanism described in any one of claims 1 to 8.

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