Variable throttling structure for injection mold debugging

Abstract

This utility model discloses a variable throttling structure for injection mold debugging, including an upper mold core. The upper end face of the upper mold core is provided with a main runner. Rotating holes are provided at both ends of the main runner on the upper mold core. Throttling valves are rotatably connected in the rotating holes. The top of the throttling valves is provided with three interconnected outlet channels. A hexagonal adjustment groove is provided at the intersection of the three outlet channels. One outlet channel is connected to the main runner, and the other two outlet channels are connected to branch channels. The branch channels are set on the upper mold core and are used to guide the injection molten material into the mold cavity. This utility model changes the effective flow cross-sectional area of ​​the outlet channels by rotating the throttling valve, thereby adjusting the flow rate of molten plastic flowing into the branch channels. It also achieves local defect isolation by aligning the solid sidewall of the unopened outlet channel with the entrance of the blocked branch channel. The whole process does not require disassembling the mold or interrupting the operation of the whole machine, avoiding unplanned downtime caused by local defects and ensuring production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold processing technology, specifically a variable throttling structure for injection mold adjustment. Background Technology

[0002] A plastic mold consists of two parts: a moving mold and a fixed mold. The moving mold is mounted on the moving platen of the injection molding machine, and the fixed mold is mounted on the fixed platen. During injection molding, the moving mold and the fixed mold close to form the gating system and the cavity. When the mold opens, the moving mold and the fixed mold separate to remove the plastic product.

[0003] Multi-cavity molds are widely used in mass production due to their ability to produce multiple products simultaneously in a single molding process, offering significant advantages such as high production efficiency and low manufacturing costs. However, during long-term use, the various cavities of the mold inevitably experience varying degrees of wear due to continuous exposure to high temperatures, high pressures, and friction from the flow of molten material. This wear not only leads to decreased dimensional accuracy and deterioration of surface quality but can also cause molding defects such as flash, incomplete filling, and product deformation, directly impacting product quality and yield. Traditionally, the entire mold set is shut down for repair or adjustment to restore its molding performance. However, when product delivery deadlines are tight, prolonged downtime for maintenance significantly impacts production progress, consequently affecting delivery cycles and production efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a variable throttling structure for injection mold adjustment, so as to solve the problems mentioned in the background art.

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

[0006] A variable throttling structure for injection mold adjustment includes an upper mold core. The upper end face of the upper mold core is provided with a main runner. Rotating holes are provided at both ends of the main runner on the upper mold core. Throttling valves are rotatably connected in the rotating holes. The top of the throttling valves is provided with three interconnected outlet channels. A hexagonal adjustment groove is provided at the intersection of the three outlet channels. One of the outlet channels is connected to the main runner, and the other two outlet channels are connected to branch channels. The branch channels are provided on the upper mold core for guiding the injection molten material into the mold cavity.

[0007] Furthermore, the bottom of the rotating hole is provided with a limiting hole coaxially connected to it, the diameter of the limiting hole is larger than the diameter of the rotating hole, and the bottom of the throttle valve is provided with an outwardly extending limiting part, the limiting part is located inside the limiting hole, and the outer diameter of the limiting part is larger than the diameter of the rotating hole.

[0008] Furthermore, the height of the limiting hole is greater than the height of the limiting part, an O-ring is abutted on the limiting part, and the other end of the O-ring abuts against the rotating hole.

[0009] Furthermore, the inner wall of the limiting hole is evenly provided with several slots along the circumference, the side wall of the limiting part is provided with a movable groove, the bottom of the movable groove is abutted by a spring, the other end of the spring is abutted by a locking post, and the outer wall of the locking post is slidably engaged with the inner wall of the movable groove.

[0010] Furthermore, the outer end of the locking pin and several locking slots are all hemispherical structures.

[0011] The beneficial effects of this utility model are:

[0012] This invention utilizes a hexagonal wrench inserted into a hexagonal adjustment slot to rotate a throttle valve, thereby altering the relative alignment between the main runner, branch runners, and each outlet runner. This adjustment method changes the effective flow cross-sectional area of ​​the outlet runner, thus regulating the flow rate of molten plastic into the branch runners. Operators can use a hexagonal wrench to rotate the throttle valve, ensuring that the solid sidewall without an outlet runner is completely aligned with and blocks the inlet of the problematic branch runner. This prevents molten plastic from entering the problematic branch runner and its corresponding mold cavity through that outlet runner, while other normal mold cavities can continue injection molding without affecting the overall production process. Operators can also rotate the throttle valve on that side, aligning the solid sidewall without an outlet runner with the main runner outlet, completely blocking the main runner outlet on that side. At this point, the melt flow to the two problematic mold cavities on that side is completely blocked, while the mold cavities on the other side of the mold can still operate normally, ensuring production continuity and stability. The entire process requires no mold disassembly or interruption of the entire machine, avoiding unplanned downtime caused by localized defects and ensuring production efficiency.

[0013] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0014] Figure 1 : Overall structural diagram of this utility model.

[0015] Figure 2 : Figure 1 Enlarged view of the structure of part A.

[0016] Figure 3 : A cross-sectional view of this utility model.

[0017] Figure 4 : Schematic diagram of the limiting plate of this utility model limiting the throttle valve.

[0018] Reference numerals: 1. Upper mold core; 2. Main runner; 3. Rotary hole; 4. Throttling valve; 5. Diverter runner; 6. Limiting plate; 7. O-ring; 31. Limiting hole; 32. Slot; 41. Outlet runner; 42. Hexagonal adjustment slot; 43. Limiting part; 44. Movable slot; 45. Spring; 46. Locking post. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] Please refer to Figure 1-4 ;

[0021] A variable throttling structure for injection mold adjustment includes an upper mold core 1. A main flow channel 2 is provided on the upper end face of the upper mold core 1 to receive molten plastic injected by the injection molding machine nozzle. Rotating holes 3 are provided at both ends of the main flow channel 2 on the upper mold core 1. A throttling valve 4 is rotatably connected within the rotating holes 3. The bottom of the throttling valve 4 abuts against a limiting plate 6 to limit the movement of the throttling valve 4. Three interconnected outlet channels 41 are provided on the top of the throttling valve 4. A hexagonal adjusting groove 42 is provided at the intersection of the three outlet channels 41, connecting the three outlet channels 41. The hexagonal adjusting groove 42 not only serves as the junction of the three outlet channels 41 but also constitutes part of the flow channel itself. Furthermore, its shape design allows for the insertion of a standard hexagonal wrench for operation. One of the outlet channels 41 is connected to the main channel 2, and the other two outlet channels 41 are connected to the branch channels 5. The branch channels 5 are set on the upper mold core 1 and are responsible for guiding the molten plastic from the main channel 2 to the corresponding mold cavities through the throttle valve 4.

[0022] The throttle valve 4 can be used for flow regulation or selective blocking.

[0023] When flow regulation is required: insert a hexagonal wrench into the hexagonal adjustment groove 42 and rotate the throttle valve 4 to change the relative alignment between the main flow channel 2, the branch flow channel 5 and each outlet channel 41. This adjustment method can change the effective flow cross-sectional area of ​​the outlet channel 41, thereby achieving regulation of the flow rate of molten plastic flowing into the branch flow channel 5.

[0024] When a single mold cavity malfunctions or becomes defective: the operator can use a hex wrench to rotate the throttle valve 4 so that the solid sidewall portion without an outlet channel 41 is completely aligned with and blocks the entrance to the problematic runner 5. In this way, the molten plastic will be unable to enter the problematic runner 5 and the corresponding mold cavity through the outlet channel 41, while other normal mold cavities can continue injection molding production without affecting the overall production process.

[0025] When both cavities on the same side malfunction: the operator can rotate the throttle valve 4 on that side, so that the solid sidewall part without the outlet channel 41 is rotated to align with the side of the main channel 2 outlet, thereby completely blocking the outlet of the main channel 2 on that side. At this time, the melt flow to the two problematic cavities on that side is completely blocked, while the cavities on the other side of the mold can still work normally, ensuring the continuity and stability of production.

[0026] By rotating the throttle valve 4, the flow rate of molten material in the multi-cavity mold can be controlled and the problematic mold cavity can be locally isolated. The whole process does not require disassembling the mold or interrupting the operation of the whole machine, avoiding unplanned downtime caused by local defects, ensuring production efficiency, and guaranteeing on-time delivery of orders.

[0027] In this embodiment, the bottom of the rotating hole 3 is provided with a limiting hole 31 coaxially connected to it. The diameter of the limiting hole 31 is larger than that of the rotating hole 3. The bottom of the throttle valve 4 is provided with an outwardly extending limiting part 43, which is located inside the limiting hole 31. The outer diameter of the limiting part 43 is larger than that of the rotating hole 3. Through the cooperation of the limiting hole 31 and the limiting part 43, the throttle valve 4 can be prevented from slipping along the direction of the rotating hole 3 during use, which is especially suitable for horizontal injection molding machines.

[0028] In addition, the height of the limiting hole 31 is greater than the height of the limiting part 43. An O-ring 7 is abutted on the limiting part 43, and the other end of the O-ring 7 abuts against the rotating hole 3. Through the elastic pre-tightening effect of the O-ring 7, not only is the seal between the throttle valve 4 and the upper mold core 1 achieved, but the friction between the throttle valve 4 and the rotating hole 3 is also increased, preventing the throttle valve 4 from rotating unexpectedly under the action of external forces such as injection pressure or vibration, and ensuring the stability after the position is adjusted.

[0029] In this embodiment, a plurality of slots 32 are evenly arranged circumferentially on the inner wall of the limiting hole 31, and a movable groove 44 is provided on the side wall of the limiting part 43. A spring 45 is installed at the bottom of the movable groove 44, and the other end of the spring 45 abuts against a locking post 46. The outer wall of the locking post 46 slides in cooperation with the inner wall of the movable groove 44, allowing it to reciprocate within the movable groove 44. Under the elastic action of the spring 45, the outer end of the locking post 46 is pushed out and locked into one of the slots 32, ensuring that the throttle valve 4 can achieve stable positioning after being rotated and adjusted to a certain angle, preventing the throttle valve 4 from rotating unexpectedly due to external forces such as injection pressure and mold vibration.

[0030] In addition, the outer end of the locking post 46 and several locking slots 32 are all hemispherical structures. The arc-shaped contact not only reduces the frictional resistance between the locking post 46 and the locking slots 32, but also allows the locking post 46 to smoothly disengage from the current locking slot 32 when the operator adjusts the angle of the throttle valve 4, and automatically fall into the adjacent locking slot 32 when reaching the next position, thus achieving step-by-step positioning.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A variable throttling structure for injection mold adjustment, comprising an upper mold core (1), wherein the upper end face of the upper mold core (1) is provided with a main runner (2), characterized in that: The upper mold core (1) is provided with rotating holes (3) at both ends of the main channel (2). A throttle valve (4) is rotatably connected in the rotating hole (3). The top of the throttle valve (4) is provided with three interconnected outlet channels (41). A hexagonal adjustment groove (42) is provided at the intersection of the three outlet channels (41). One of the outlet channels (41) is connected to the main channel (2), and the other two outlet channels (41) are connected to a branch channel (5). The branch channel (5) is set on the upper mold core (1) and is used to guide the injection molten material into the mold cavity.

2. The variable throttling structure for injection mold adjustment according to claim 1, characterized in that, The bottom of the rotating hole (3) is provided with a limiting hole (31) coaxially connected to it. The diameter of the limiting hole (31) is larger than the diameter of the rotating hole (3). The bottom of the throttle valve (4) is provided with an outwardly extending limiting part (43). The limiting part (43) is located inside the limiting hole (31). The outer diameter of the limiting part (43) is larger than the diameter of the rotating hole (3).

3. The variable throttling structure for injection mold adjustment according to claim 2, characterized in that, The height of the limiting hole (31) is greater than the height of the limiting part (43), and an O-ring (7) abuts on the limiting part (43). The other end of the O-ring (7) abuts against the rotating hole (3).

4. The variable throttling structure for injection mold adjustment according to claim 3, characterized in that, The inner wall of the limiting hole (31) is uniformly provided with several slots (32) along the circumference. The side wall of the limiting part (43) is provided with a movable groove (44). The bottom of the movable groove (44) abuts against a spring (45). The other end of the spring (45) abuts against a locking post (46). The outer wall of the locking post (46) slides in cooperation with the inner wall of the movable groove (44).

5. The variable throttling structure for injection mold adjustment according to claim 4, characterized in that, The outer end of the locking post (46) and several locking slots (32) are all hemispherical structures.

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