A sealing structure of a mold cavity for two-color injection molding

Abstract

This utility model discloses a sealing mold cavity structure for two-color injection molding to prevent overflow. It includes a support base fixedly mounted at the bottom of an injection frame, a lower mold fixedly connected to the upper end of the support base, an electric push rod fixedly connected to the upper end of the injection frame, and an upper mold fixedly connected to the power end of the electric push rod. The upper and lower molds are correspondingly fitted, and an injection mechanism is fixedly mounted on the upper end of the upper mold. Side plates are movably mounted around the lower mold at the upper end of the support base, and brackets are fixedly connected to the outer sides of the side plates. Insertion interfaces communicating with the inner cavity are provided around the support base, and the brackets slide through the insertion interfaces. This utility model, by providing relatively movable side plates around the perimeter of the upper and lower molds during mold closing, ensures complete alignment and contact between the upper and lower molds during the contact process, avoiding minor misalignment. Furthermore, the sealing gaskets on the inner sides of the side plates abut against the outer side of the gap after the upper and lower molds contact, achieving a seal and effectively preventing flash and overflow.

Description

Technical Field

[0001] This utility model relates to the field of injection molding, and in particular to a structure for sealing the mold cavity to prevent overflow in two-color injection molding. Background Technology

[0002] Two-color injection molding technology is widely used in consumer electronics, automotive lighting, and medical devices due to its ability to achieve complex structures and diverse appearances. However, with increasing product sophistication, existing molds commonly face the problem of flash caused by melt overflow.

[0003] Existing molds generally consist of two parts: a moving mold and a fixed mold (or a punch and a die). These parts can be separated and joined together. When separated, the part is removed; when joined, the blank is injected into the mold cavity to form the mold. Molds are precision tools with complex shapes, bearing the expansion force of the blank. They have high requirements for structural strength, rigidity, surface hardness, surface roughness, and machining accuracy. During the mold-closing process, the contact surfaces of the upper and lower molds will wear down over time and may even shift, leading to flash and excess material, which is the remaining material that overflows into the gap between the mold's closing surfaces and remains on the plastic part. Utility Model Content

[0004] In order to solve the problems in the background art, this utility model adopts the following technical solution:

[0005] A two-color injection molding anti-overflow sealing mold cavity structure includes a support base fixedly installed at the bottom of an injection frame. A lower mold is fixedly connected to the upper end of the support base. An electric push rod is fixedly connected to the upper end of the injection frame. An upper mold is fixedly connected to the power end of the electric push rod. The upper mold and the lower mold are correspondingly fitted. An injection mechanism is fixedly installed at the upper end of the upper mold. Side plates are movably installed around the lower mold at the upper end of the support base. Brackets are fixedly connected to the outer side of the side plates. Insertion interfaces communicating with the inner cavity are provided through the perimeter of the support base. The brackets slide through the insertion interfaces. A motor is fixedly connected to the inner cavity of the support base to drive the brackets around the perimeter to slide laterally in the insertion interfaces.

[0006] Preferably, a support frame is fixedly connected to the inner wall of the support base at the outer position of the insertion interface, and a threaded rod is provided through the inner end of the support frame.

[0007] Preferably, the threaded rod is rotatably connected to the support frame via a bearing, and the threaded rod is threaded into the inner end of the support frame.

[0008] Preferably, the longitudinal cross-section of both the bracket and the connector is square, and the contact surfaces of both the bracket and the connector are designed with a smooth surface structure.

[0009] Preferably, the side plate is aligned with the outer side of the gap between the lower mold and the upper mold after they are closed, and a sealing gasket is provided on the inner side of the side plate.

[0010] Preferably, the motor power end is fixedly connected to a main bevel gear, while the inner end of the threaded rod is fixedly connected to a secondary bevel gear meshing with the main bevel gear, and adjacent secondary bevel gears do not contact each other.

[0011] Compared with the prior art, the present invention has the following beneficial effects;

[0012] This invention features relatively movable side plates around the perimeter of the upper and lower molds. The side plates are driven by a motor to move relative to each other and abut against the outer side of the mold after it is closed. This ensures that the upper and lower molds are fully aligned and in contact during the contact process, avoiding minor misalignment. Furthermore, the sealing gaskets on the inner side of the side plates abut against the outer side of the gap after the upper and lower molds come into contact, thus effectively preventing flash and overflow. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a top view of the cross-sectional structure of the support base of this utility model;

[0015] Figure 3 This is a side view of the cross-sectional structure of the support base of this utility model;

[0016] Figure 4 This is a top view of the side plate structure of this utility model.

[0017] In the diagram: 1-Injection frame, 2-Support base, 201-Support frame, 202-Threaded rod, 203-Secondary bevel gear, 3-Lower mold, 4-Upper mold, 5-Electric push rod, 6-Injection mechanism, 7-Side plate, 701-Sealing gasket, 8-Bracket, 9-Insertion interface, 10-Motor, 11-Main bevel gear. Detailed Implementation

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "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, and are not intended to indicate or imply that the device or component 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.

[0019] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figure 1-4 A two-color injection molding anti-overflow sealing mold cavity structure includes a support base 2 fixedly installed at the bottom of an injection frame 1. A lower mold 3 is fixedly connected to the upper end of the support base 2. An electric push rod 5 is fixedly connected to the upper end of the injection frame 1. An upper mold 4 is fixedly connected to the power end of the electric push rod 5. The upper mold 4 and the lower mold 3 are correspondingly matched. An injection mechanism 6 is fixedly installed at the upper end of the upper mold 4. Side plates 7 are movably installed around the lower mold 3 at the upper end of the support base 2. A bracket 8 is fixedly connected to the outside of the side plates 7. An insertion interface 9 communicating with the inner cavity is provided through the support base 2. The bracket 8 slides through the insertion interface 9. A motor 10 is fixedly connected to the inner cavity of the support base 2 to drive the bracket 8 around the perimeter to slide laterally in the insertion interface 9. The inner wall of the support base 2 is fixedly connected to the support frame 201 at the outer position of the insertion interface 9. The inner end of the support frame 201 is provided with a threaded rod 202, which is rotatably connected to the support frame 201 through a bearing. The threaded rod 202 is threaded into the inner end of the bracket 8. The longitudinal sections of the bracket 8 and the insertion interface 9 are both square, and the contact surfaces of the bracket 8 and the insertion interface 9 are both designed with a smooth surface structure to reduce the overall moving friction. The side plate 7 is connected to the outer side of the gap after the lower mold 3 and the upper mold 4 are closed. The inner side of the side plate 7 is provided with a sealing gasket 701. The power end of the motor 10 is fixedly connected to the main bevel gear 11, and the inner end of the threaded rod 202 is fixedly connected to the secondary bevel gear 203 that meshes with the main bevel gear 11. The adjacent secondary bevel gears 203 do not contact each other.

[0023] Based on the above structural configuration, when using this device, the operator activates the electric push rod 5 via an external switch to press down the upper mold 4 and connect it to the lower mold 2 at the upper end of the support base 2, thereby achieving mold closing. Simultaneously, the motor 10 is activated via the external switch. The motor 10 drives the main bevel gear 11 at the power end to rotate, meshing with the secondary bevel gear 203 at the inner end of multiple sets of threaded rods 202. This, in turn, drives the multiple sets of threaded rods 202 to rotate inside the support frame 201. During the rotation of the threaded rods 202, they thread-drive the bracket 8. Since the longitudinal cross-section of the bracket 8 and the insertion interface 9 is square, ... The sliding limiter allows the rotation drive bracket 8 of the threaded rod 202 to move laterally along the insertion interface 9, thereby driving the side plate 7 connected to the outer end of the bracket 8 to move synchronously relative to each other. This causes the side plate 7 to abut against the gap on the outer side of the upper and lower molds after mold closing. During this process, the side plate 7 ensures that the upper and lower molds are fully aligned and in contact, avoiding minor misalignment. At the same time, the sealing gasket 701 on the inner side of the side plate 7 abuts against the outer side of the gap after the upper and lower molds come into contact to achieve a seal, thereby effectively preventing flash and overflow. Then, the injection molding mechanism 6 can be started to perform injection molding.

[0024] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

Claims

1. A two-color injection molding anti-overflow sealing mold cavity structure, comprising a support base (2) fixedly disposed at the bottom of an injection frame (1), a lower mold (3) fixedly connected to the upper end of the support base (2), an electric push rod (5) fixedly connected to the upper end of the injection frame (1), an upper mold (4) fixedly connected to the power end of the electric push rod (5), the upper mold (4) and the lower mold (3) correspondingly cooperating, and an injection mechanism (6) fixedly disposed at the upper end of the upper mold (4), characterized in that, The upper end of the support base (2) is provided with side plates (7) around the lower mold (3). A bracket (8) is fixedly connected to the outside of the side plate (7). An insertion interface (9) communicating with the inner cavity is provided around the support base (2), and the bracket (8) slides through the insertion interface (9). A motor (10) is fixedly connected to the inner cavity of the support base (2) to drive the bracket (8) around the perimeter to slide laterally in the insertion interface (9).

2. The anti-overflow sealing mold cavity structure for two-color injection molding according to claim 1, characterized in that, The inner wall of the support base (2) is fixedly connected to a support frame (201) located outside the insertion interface (9), and a threaded rod (202) is provided through the inner end of the support frame (201).

3. The anti-overflow sealing mold cavity structure for two-color injection molding according to claim 2, characterized in that, The threaded rod (202) is rotatably connected to the support frame (201) via a bearing, and the threaded rod (202) is threaded into the inner end of the bracket (8).

4. The anti-overflow sealing mold cavity structure for two-color injection molding according to claim 3, characterized in that, The longitudinal cross-sections of the bracket (8) and the plug-in interface (9) are both square, and the contact surfaces of the bracket (8) and the plug-in interface (9) are both designed with a smooth surface structure.

5. The anti-overflow sealing mold cavity structure for two-color injection molding according to claim 4, characterized in that, The side plate (7) is connected to the outside of the gap after the lower mold (3) and the upper mold (4) are closed, and a sealing gasket (701) is provided on the inner side of the side plate (7).

6. The anti-overflow sealing mold cavity structure for two-color injection molding according to claim 5, characterized in that, The motor (10) is fixedly connected to a main bevel gear (11) at its power end, and a secondary bevel gear (203) meshing with the main bevel gear (11) is fixedly connected to the inner end of the threaded rod (202). The adjacent secondary bevel gears (203) do not contact each other.

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