Demolding mechanism of plastic turntable injection mold

Abstract

The utility model provides a demolding mechanism of a plastic turntable injection mold, and belongs to the field of molds. The mold comprises a fixed mold plate and a movable mold plate, the fixed mold plate and the movable mold plate are closed to form a forming cavity, a mold core is arranged on the side, close to the fixed mold plate, of the movable mold plate, a straight jacking rod and an inclined jacking rod are slidably connected into the mold core, the inclined jacking rod is rotationally connected with a falling-off driving rod, and the falling-off driving rod and the inclined jacking rod are connected through a passive elastic piece. The ends, close to the fixed mold plate, of the falling-off driving rod and the straight jacking rod are flush with the outer surface of the mold core and form a forming face, and the straight jacking rod and the inclined jacking rod are both connected with the jacking mechanism. The injection mold has the beneficial effects that high-success-rate demolding is realized through the steps of firstly separating the mold from the mold core and then separating the mold from the ejection piece, and the phenomena of mold breakage, bending and the like generated in the demolding process are prevented.

Description

Technical Field

[0001] The utility model belongs to the field of molds, and in particular relates to a demoulding mechanism of a plastic turntable injection mold. Background Art

[0002] Injection molds are produced in various shapes and sizes through the coordinated changes of male and female molds and auxiliary molding systems. During the demolding process, demolding is often difficult due to the large volume or area of the mold, the majority of which adheres to the core, or the complex structure of the mold. In such cases, demolding cannot be performed effectively with just a simple demolding step, and the mold surface may be warped, resulting in a low yield rate for the finished product.

[0003] For example, a Chinese invention patent discloses an elastic demolding mechanism for a core mold [application number CN202311016929.9], which includes a mold body with a movable mold and a fixed mold arranged inside. The elastic demolding mechanism includes: an elastic auxiliary demolding component for assisting the rotational separation of the processed and formed product from the movable mold, which is arranged on the movable mold and the fixed mold; a rotary lifting component for driving the processed and formed product to be rotary demolded from the fixed mold, which is arranged inside the mold body, one end of which passes through the fixed mold and fits with the processed and formed product. During the demolding process, the elastic auxiliary demolding component can help separate the formed product from the movable mold, and the rotary lifting component can help separate the formed product from the fixed mold and the rotary lifting component, which can effectively avoid adhesion of the formed product to the structure in the mold, thereby enabling the formed product to be separated at one time. Utility Model Content

[0004] The purpose of the utility model is to provide a demoulding mechanism for a plastic turntable injection mold in order to solve the above problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A demolding mechanism for a plastic turntable injection mold includes a fixed mold plate and a movable mold plate. When the fixed mold plate and the movable mold plate are combined to form a molding cavity, a core is provided on the side of the movable mold plate close to the fixed mold plate. A straight lifting rod and an oblique lifting rod are slidably connected to the core. The oblique lifting rod is rotatably connected to a falling-off driving rod. The falling-off driving rod and the oblique lifting rod are connected to the oblique lifting rod by a passive elastic part. When the mold is closed, the ends of the falling-off driving rod and the straight lifting rod close to the fixed mold plate are flush with the outer surface of the core and form a molding surface. The straight lifting rod and the oblique lifting rod are both connected to the lifting mechanism.

[0007] In the above-mentioned demolding mechanism of a plastic turntable injection mold, a lifting space is provided in the core, and the lifting mechanism includes a lifting block located in the lifting space and slidably connected thereto, the lifting block is connected to an external linear drive, the linear drive is arranged on the movable template, and its output shaft slides through the movable template and penetrates into the lifting space and is connected to the lifting block, the lifting block is slidably connected to the oblique lifting rod, and the lifting block is fixedly connected to the straight lifting rod. When the mold is closed, the connection between the falling drive rod and the oblique lifting rod is located in the core, and during demolding, the connection will extend out of the core.

[0008] In the above-mentioned demoulding mechanism of the plastic turntable injection mold, the lifting block is provided with a slide groove with an I-shaped or convex cross section, and the oblique lifting rod extends into the slide groove to slide and the structure extending into the slide groove is adapted to the slide groove.

[0009] In the above-mentioned demolding mechanism of a plastic turntable injection mold, the width of the falling-off driving rod is greater than the width of the oblique lifting rod, the falling-off driving rod and the oblique lifting rod are connected by a rotating shaft, the rotating shaft is fixedly connected to the falling-off driving rod, the passive elastic part is a spring and is sleeved on the rotating shaft, the two ends of the spring are respectively connected to the rotating shaft and the oblique lifting rod, and when the mold is closed, the spring is in a compressed state.

[0010] In the above-mentioned demolding mechanism of a plastic turntable injection mold, the falling-off driving rod and the oblique lifting rod are slidably connected to the core through an oblique groove, and the oblique groove is divided into two sections. The falling-off driving rod and the oblique lifting rod are respectively adapted to the two sections of the oblique groove, and a step card surface is formed between the two sections of the oblique groove. When the mold is closed, the falling-off driving rod rests on the step card surface.

[0011] In the demoulding mechanism of the above-mentioned plastic turntable injection mold, two oblique lifting rods and two falling driving rods are slidably connected in the core. The two oblique lifting rods are placed opposite to each other and their moving directions are also opposite to each other.

[0012] In the above-mentioned demoulding mechanism of the plastic turntable injection mold, the passive elastic member can drive the shedding driving rod to rotate toward the center of the core.

[0013] In the above-mentioned demoulding mechanism of the plastic turntable injection mold, the molding cavity is provided with a plurality of circular grooves on the molding surface located at the fixed mold plate.

[0014] In the above-mentioned demoulding mechanism of the plastic turntable injection mold, a plurality of counteracting plates are provided on the fixed mold plate.

[0015] In the above-mentioned demoulding mechanism of the plastic turntable injection mold, the fixed mold plate is provided with a plurality of exhaust holes.

[0016] Compared with the existing technology, the advantages of this utility model are:

[0017] 1. When the dropout drive rod is fully extended from the core, the passive elastic element causes it to rotate relative to the oblique ejector rod. The resulting stress causes the mold to separate from the dropout drive rod and straight ejector rod, completing the demolding process. By first separating the mold from the core and then from the ejector, a high demolding success rate is achieved, preventing mold cracking and bending during the demolding process.

[0018] 2. The step card surface is used to locate and limit the position.

[0019] 3. Since the mold is large, the number of shedding drive rods is increased to make the demoulding more stable.

[0020] 4. During demoulding, the stress generated by the driving rods on both sides is in opposite directions, making demoulding smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the entire utility model;

[0022] Figure 2 It is a schematic diagram of a fixed template;

[0023] Figure 3 It is a schematic diagram of the moving plate head;

[0024] Figure 4 is a schematic diagram of the core cross section;

[0025] Figure 5 It is a connection diagram of the oblique lifting rod and the shedding drive rod.

[0026] In the figure: fixed template 10, movable template 11, core 13, straight lifting rod 14, oblique lifting rod 15, falling drive rod 16, passive elastic member 17, lifting space 18, lifting block 19, slide 20, rotating shaft 21, inclined groove 22, groove 23, offset piece 24, exhaust hole 25. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] This embodiment provides a demoulding mechanism for a plastic turntable injection mold, combined with Figure 1-5As shown, it includes a fixed template 10 and a movable template 11. The fixed template 10 and the movable template 11 are molded together to form a molding cavity. The movable template 11 is provided with a core 13 on the side close to the fixed template 10. A straight lifting rod 14 and an oblique lifting rod 15 are slidingly connected in the core 13. The oblique lifting rod 15 is rotatably connected to a falling-off driving rod 16. The falling-off driving rod 16 and the oblique lifting rod 15 are connected by a passive elastic member 17. When the mold is closed, the end of the falling-off driving rod 16 and the straight lifting rod 14 close to the fixed template 10 is flush with the outer surface of the core 13 and forms a molding surface. The straight lifting rod 14 and the oblique lifting rod 15 are both connected to the lifting mechanism.

[0029] In this embodiment, when the mold is closed, the shedding driving rod 16, the oblique lifting rod 15 and the straight lifting rod 14 are all located in the core 13, and the ends of the shedding driving rod 16 and the straight lifting rod 14 close to the fixed plate 10 are flush with the outer surface of the core 13 and form a molding surface. After the injection molding is completed and cooled, the movable plate 11 and the fixed plate 10 are separated, and the mold is still adhered to the core 13. Then the lifting mechanism works, and the lifting mechanism first moves the oblique lifting rod 15 and the straight lifting rod 14. When the shedding driving rod 16 is not fully extended, the movable plate 11 and the fixed plate 10 are separated. When extending the core 13, the oblique lifting rod 15 and the disengagement driving rod 16 move along the oblique slot 22. At this time, the disengagement driving rod 16 and the straight lifting rod 14 are not disconnected from the mold and only serve to eject the mold from the core 13. When the disengagement driving rod 16 is fully extended from the core 13, the passive elastic member 17 causes the disengagement driving rod 16 to rotate relative to the oblique lifting rod 15. The generated stress causes the mold to separate from the disengagement driving rod 16 and the straight lifting rod 14, thus completing the demolding step. By first separating the mold from the core 13 and then separating the mold from the ejector, a high success rate of demolding is achieved, preventing mold cracking and bending during the demolding process.

[0030] A lifting space 18 is provided in the core 13, and the lifting mechanism includes a lifting block 19 located in the lifting space 18 and slidingly connected thereto, the lifting block 19 is connected to an external linear drive, and the linear drive is arranged on the movable template 11, and its output shaft slides through the movable template 11 and penetrates into the lifting space 18 and is connected to the lifting block 19, the lifting block 19 is slidingly connected to the oblique lifting rod 15, and the lifting block 19 is fixedly connected to the straight lifting rod 14. When the mold is closed, the connection between the shedding drive rod 16 and the oblique lifting rod 15 is located in the core 13, and during demolding, the connection will extend out of the core 13.

[0031] In this embodiment, after the fixed template 10 and the movable template 11 are separated, the linear drive works to move its output shaft, so that the lifting block 19 moves in the lifting space 18 toward the direction close to the mold, thereby moving the oblique lifting rod 15 and the straight lifting rod 14 upward. Since the oblique lifting rod 15 is slidingly connected to the core 13, that is, the oblique lifting rod 15 moves in the oblique groove 22, the moving direction of the oblique lifting rod 15 will not change. Therefore, the sliding connection between the lifting block 19 and the oblique lifting rod 15 is used to realize the oblique lifting rod 15 and the straight lifting rod 14 to move upward to eject the mold. When the connection between the falling-off driving rod 16 and the oblique lifting rod 15 extends out of the core 13, the falling-off driving rod 16 is rotated relative to the oblique lifting rod 15 under the action of the passive elastic member 17. The stress generated causes the mold to be separated from the falling-off driving rod 16 and the straight lifting rod 14, and finally completes the demoulding step.

[0032] The lifting block 19 is provided with a slide groove 20 having an I-shaped or convex cross section. The oblique lifting rod 15 extends into the slide groove 20 to slide and the structure extending into the slide groove 20 is adapted to the slide groove 20 .

[0033] In this embodiment, although the lifting block 19 is slidingly connected to the oblique lifting rod 15, the oblique lifting rod 15 is always connected to the lifting block 19. During demolding, the lifting block 19 moves the oblique lifting rod 15 upward. During mold closing, the lifting block 19 places the oblique lifting rod 15 and the shedding drive rod 16 into the core 13.

[0034] The width of the shedding drive rod 16 is greater than the width of the oblique lifting rod 15. The shedding drive rod 16 is connected to the oblique lifting rod 15 through a rotating shaft 21. The rotating shaft 21 is fixedly connected to the shedding drive rod 16. The passive elastic member 17 is a spring and is sleeved on the rotating shaft 21. The two ends of the spring are respectively connected to the rotating shaft 21 and the oblique lifting rod 15. When the mold is closed, the spring is in a compressed state.

[0035] In this embodiment, during demolding, when the dropout drive rod 16 is fully extended from the core 13, the spring releases its force, driving the dropout drive rod 16, thereby separating the dropout drive rod 16 from the mold and ultimately achieving demolding. During mold closing, the lifting block 19 moves back, driving the dropout drive rod 16 toward the core 13, where it compresses the spring to cause the dropout drive rod 16 to rotate and ultimately extend into the core 13.

[0036] The falling-off driving rod 16 and the oblique lifting rod 15 are slidingly connected to the core 13 through the oblique groove 22. The oblique groove 22 is divided into two sections. The falling-off driving rod 16 and the oblique lifting rod 15 are respectively adapted to the two sections of the oblique groove 22, and a step card surface is formed between the two sections of the oblique groove 22. When the mold is closed, the falling-off driving rod 16 rests on the step card surface.

[0037] In this embodiment, the step clamping surface is used for positioning and limiting the position. Since the outer surface of the shedding drive rod 16 is part of the molding surface when the mold is closed, when the shedding drive rod 16 and the straight lifting rod 14 are close to one end of the fixed mold plate 10 and are flush with the outer surface of the core 13 and form a molding surface, the shedding drive rod 16 just rests on the two sections of the inclined groove 22 to form a step clamping surface.

[0038] Two oblique lifting rods 15 and two falling driving rods 16 are slidably connected in the core 13 . The two oblique lifting rods 15 are placed opposite to each other and their moving directions are also opposite to each other.

[0039] In this embodiment, since the mold is relatively large, the number of the falling driving rods 16 is increased to make the mold more stable during demoulding.

[0040] The passive elastic member 17 can drive the shedding driving rod 16 to rotate toward the center of the core 13 .

[0041] In this embodiment, during demoulding, the stresses generated by the driving rods 16 on both sides are in opposite directions, making demoulding smoother.

[0042] The molding cavity is provided with a plurality of circular grooves 23 on the molding surface of the fixed mold plate 10 .

[0043] In this embodiment, during injection molding, the molding liquid will form a raised ring at the bottom of the mold in the groove 23, which is used to prevent the plastic turntable from slipping and increase friction.

[0044] The fixed template 10 is provided with a plurality of counteracting pieces 24 .

[0045] In this embodiment, when the mold is closed, the abutting piece 24 abuts against the movable platen 11 , thereby increasing the friction between the fixed platen 10 and the movable platen 11 .

[0046] The fixed plate 10 is provided with a plurality of exhaust holes 25 .

[0047] In this embodiment, the exhaust hole 25 is used to discharge hot air during injection molding.

[0048] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0049] Although this article uses the fixed template 10, movable template 11, molding cavity, core 13, straight lifting rod 14, inclined lifting rod 15, falling drive rod 16, passive elastic part 17, lifting space 18, lifting block 19, slide 20, rotating shaft 21, inclined groove 22, groove 23, offset plate 24, exhaust hole 25, etc. more frequently, these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restriction is contrary to the spirit of the present invention.

Claims

1. A demoulding mechanism for a plastic turntable injection mold, comprising a fixed mold plate (10) and a movable mold plate (11), wherein the fixed mold plate (10) and the movable mold plate (11) are combined to form a molding cavity, and a core (13) is provided on the side of the movable mold plate (11) close to the fixed mold plate (10), characterized in that: The core (13) is slidably connected with a straight lifting rod (14) and an oblique lifting rod (15); the oblique lifting rod (15) is rotatably connected with a falling driving rod (16); the falling driving rod (16) and the oblique lifting rod (15) are connected via a passive elastic member (17); when the mold is closed, one end of the falling driving rod (16) and the straight lifting rod (14) close to the fixed mold plate (10) is flush with the outer surface of the core (13) and forms a molding surface; the straight lifting rod (14) and the oblique lifting rod (15) are both connected to the lifting mechanism.

2. The demoulding mechanism of the plastic turntable injection mold according to claim 1, characterized in that: A lifting space (18) is provided in the core (13), and the lifting mechanism includes a lifting block (19) located in the lifting space (18) and slidably connected thereto, the lifting block (19) is connected to an external linear drive, the linear drive is arranged on the movable template (11), and its output shaft slides through the movable template (11) and penetrates into the lifting space (18) and is connected to the lifting block (19), the lifting block (19) is slidably connected to the oblique lifting rod (15), and the lifting block (19) is fixedly connected to the straight lifting rod (14), and when the mold is closed, the connection between the shedding drive rod (16) and the oblique lifting rod (15) is located in the core (13), and when the mold is demoulded, the connection will extend out of the core (13).

3. The demoulding mechanism of the plastic turntable injection mold according to claim 2, characterized in that: The lifting block (19) is provided with a slide groove (20) with an I-shaped or convex cross section, and the oblique lifting rod (15) extends into the slide groove (20) to slide and the structure extending into the slide groove (20) is adapted to the slide groove (20).

4. The demoulding mechanism of the plastic turntable injection mold according to claim 1, characterized in that: The width of the falling driving rod (16) is greater than the width of the oblique lifting rod (15); the falling driving rod (16) and the oblique lifting rod (15) are connected via a rotating shaft (21); the rotating shaft (21) is fixedly connected to the falling driving rod (16); the passive elastic member (17) is a spring and is sleeved on the rotating shaft (21); the two ends of the spring are respectively connected to the rotating shaft (21) and the oblique lifting rod (15); when the mold is closed, the spring is in a compressed state.

5. The demoulding mechanism of the plastic turntable injection mold according to claim 4, characterized in that: The falling-off driving rod (16) and the oblique lifting rod (15) are slidably connected to the core (13) through the oblique groove (22). The oblique groove (22) is divided into two sections. The falling-off driving rod (16) and the oblique lifting rod (15) are respectively adapted to the two sections of the oblique groove (22), and a step card surface is formed between the two sections of the oblique groove (22). When the mold is closed, the falling-off driving rod (16) rests on the step card surface.

6. The demoulding mechanism of the plastic turntable injection mold according to any one of claims 1 to 5, characterized in that: Two oblique lifting rods (15) and two falling driving rods (16) are slidably connected in the core (13); the two oblique lifting rods (15) are placed opposite to each other and their moving directions are also opposite to each other.

7. The demoulding mechanism of the plastic turntable injection mold according to claim 6, characterized in that: The passive elastic member (17) can drive the shedding driving rod (16) to rotate toward the center of the core (13).

8. The demoulding mechanism of the plastic turntable injection mold according to claim 1, characterized in that: The molding cavity is provided with a plurality of circular grooves (23) on the molding surface located at the fixed mold plate (10).

9. The demoulding mechanism of the plastic turntable injection mold according to claim 1, characterized in that: The fixed template (10) is provided with a plurality of abutting pieces (24).

10. The demoulding mechanism of the plastic turntable injection mold according to claim 1, characterized in that: The fixed template (10) is provided with a plurality of exhaust holes (25).

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