Automatic shedding structure of vertical pin-point gate of two-plate mold

Abstract

The utility model relates to a kind of two-plate mould vertical type point gate automatic shedding structure, including gate plate (10), A plate (20), gate piece (30) and draw material block (40). Gate plate is connected with A plate by first guide mechanism (50), realizes opening and closing movement;Gate piece is equipped with main runner (31) and branch (32);Draw material block is placed in the cavity space (21) of A plate, its passage (41) is set for branch, and can be vertically moved relative to A plate.Gate plate is connected draw material block by second guide mechanism (60), and the mechanism is designed as: gate plate is separated from A plate after preset first stroke, only then drive draw material block to move.When mold opening, gate plate is first separated from A plate and pulls out main runner head, then second guide mechanism drives draw material block to move up, and vertical tensile force is generated at point gate (33) to make gate automatic break, realize gate and plastic piece separation.The structure simplifies mould design, reduces failure rate, and improves production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of molds, and in particular to an automatic detachment structure for a vertical point gate in a two-plate mold. Background Technology

[0002] In traditional gate structures, gates typically require manual removal or rely on complex mechanisms in three-plate molds for automatic gate detachment. While three-plate molds can automatically detach gates, they are complex, costly, prone to failure, and increase equipment space requirements. Manual gate removal is inefficient, easily damages plastic parts, and fails to meet the demands of automated production. Furthermore, existing two-plate mold gate detachment mechanisms often suffer from inaccurate timing, gate residue, or damage to plastic parts. Therefore, there is an urgent need for an automatic gate detachment structure suitable for two-plate molds that simplifies the mold while ensuring precise and reliable gate separation. Utility Model Content

[0003] In view of the above situation, it is necessary to provide a two-plate mold vertical point gate automatic detachment structure to solve at least one of the above problems, including: Sprue plate (10); Plate A (20), the gate plate (10) is connected to Plate A (20) through a first guide mechanism (50), so that the gate plate (10) can open and close relative to Plate A (20); A sprue (30) having a main runner (31) and at least one branch runner (32); The pull block (40) has a cavity space (21) on the A plate (20) for accommodating the pull block (40), the pull block (40) has a channel (41) through which the branch channel (32) of the gate component (30) passes, and the pull block (40) can move vertically relative to the A plate (20); The sprue plate (10) is connected to the pull block (40) via a second guide mechanism (60). The second guide mechanism (60) is configured to move the pull block (40) relative to the A plate (20) only after the sprue plate (10) has separated from the A plate (20) by a predetermined first stroke.

[0004] Preferably, the first guiding mechanism (50) includes: At least one first limiting rod (51), one end of which is fixed to the gating plate (10); The A plate (20) is provided with a first limiting channel (52) through which the first limiting rod (51) passes. The first limiting rod (51) is provided with a first limiting plate (53) at the end away from the gate plate (10), and the diameter of the first limiting plate (53) is larger than the diameter of the first limiting rod (51); The first limiting channel (52) is provided with a stepped structure (54) for blocking the first limiting plate (53) to limit the maximum separation distance between the gate plate (10) and the A plate (20).

[0005] Preferably, the first guiding mechanism (50) further includes at least one guide post (55) disposed on the outside of the sprue plate (10), and a guide channel (56) disposed on the A plate (20) and slidingly engaged with the guide post (55).

[0006] Preferably, the second guide mechanism (60) includes: At least one second limiting rod (61), one end of which is fixed to the gate plate (10) and passes through the A plate (20); The material pulling block (40) is provided with a second limiting channel (62) through which the second limiting rod (61) passes. The end of the second limiting rod (61) away from the gate plate (10) is provided with a second limiting plate (63), and the diameter of the second limiting plate (63) is larger than the diameter of the second limiting rod (61); The second limiting channel (62) is provided with a stepped structure (64) for cooperating with the second limiting plate (63). The length of the second limiting rod (61) is set such that the second limiting plate (63) abuts against the stepped structure (64) to drive the pulling block (40) to move after the gate plate (10) and the A plate (20) have separated from each other during the first stroke.

[0007] Preferably, a guide fit structure is provided between the outer wall of the pulling block (40) and the inner wall of the cavity space (21) to guide the pulling block (40) to move stably and vertically within the cavity space (21).

[0008] Preferably, the main runner (31) of the sprue (30) is housed within the sprue plate (10), and the branch runner (32) of the sprue (30) extends from the sprue plate (10) into the channel (41) of the pull block (40). Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the closed mold structure of the two-plate mold with vertical point gate automatic detachment structure according to an embodiment of the present invention.

[0010] Figure 2This is a schematic diagram of the mold opening structure of the two-plate mold with vertical point gate automatic detachment structure according to an embodiment of this utility model. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description of the automatic detachment structure of the vertical point gate in a two-plate mold, in conjunction with the accompanying drawings and embodiments, provides further insight. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit its scope.

[0012] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "center," "longitudinal," "lateral," "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship 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 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," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0013] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will be able to understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0014] Please see Figure 1 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.

[0015] Please see Figures 1 to 2 This invention provides an automatic detachment structure for a vertical point gate in a two-plate mold.

[0016] Structural composition and assembly relationship (reference) Figure 1 ): This structure is mainly installed in the mother mold part of the two-plate mold, including the sprue plate (10) and the A plate (20). The sprue plate (10) is located above the A plate (20) and is connected and guided by the first guide mechanism (50). Inside the A plate (20), one or more cavity spaces (21) are provided for slidingly accommodating the pull block (40). The other side of the A plate (20) cooperates with the B plate 90 to jointly form a cavity (80) for molding the plastic part (70).

[0017] The sprue (30) is a key component, typically made of a wear-resistant, thermally conductive material (such as beryllium copper or hardened steel). Its upper main runner (31) is housed within the sprue plate (10) and aligned with the injection molding machine nozzle. Its lower branch runner (32) passes through the A-plate (20) and through a channel (41) located inside the pull block (40). The end of the branch runner (32) connects to the cavity (80) via a point gate (33) with a sharply narrowed diameter.

[0018] Working principle and action breakdown: 1. Mold closing and injection molding stage (refer to) Figure 1 ): The mold is in a fully closed state. The sprue plate (10), A plate (20), and pull block (40) fit tightly together. Molten plastic is injected from the injection molding machine nozzle, passes through the main runner (31), branch runner (32), and point gate (33), and finally fills the cavity (80) to form the plastic part (70). After holding pressure and cooling, the plastic part (70) and the gating system solidify into a whole.

[0019] 2. First stage of mold opening: Separation of the sprue plate from the A plate (reference) Figure 2 ): The injection molding machine pulls the sprue plate (10) backward (upward) to start the mold opening action.

[0020] Under the action of the first guiding mechanism (50), the sprue plate (10) and the A plate (20) begin to separate. Specifically, the first limiting rod (51) fixed on the sprue plate (10) slides within the first limiting channel (52) of the A plate (20). At the same time, the guide post (55) plays a precise guiding role within the guide channel (56).

[0021] At this stage, the key lies in the design of the second guiding mechanism (60). For example... Figure 1 as well as Figure 2As shown, the second limiting rod (61) fixed to the sprue plate (10) also moves accordingly, but there is a preset gap L between the second limiting plate (63) at its end and the stepped structure (64) in the second limiting channel (62) of the pull block (40). The distance of this gap is the preset first stroke. Therefore, during the entire process when the sprue plate (10) moves a distance less than L, the second limiting plate (63) does not contact the pull block (40), and the pull block (40) remains relatively stationary with respect to plate A (20) under its own weight or the action of a positioning spring (which can be added as needed). The main function of this stage is to smoothly pull the sprue solidified in the main runner (31) out of the injection molding machine nozzle.

[0022] 3. Second stage of mold opening: The material puller is driven, and the gate automatically breaks off (see reference). Figure 2 ): When the mold opening stroke of the sprue plate (10) exceeds the distance L, the second limiting plate (63) of the second limiting rod (61) will abut against the stepped structure (64) inside the pull block (40).

[0023] At this time, the injection molding machine continues to provide mold opening force, which is directly transmitted to the pull block (40) through the second guide mechanism (60), forcibly driving the pull block (40) to move backward (upward) relative to the A plate (20).

[0024] Since the plastic part (70) remains inside the cavity (80) of plate A (20), and the pull block (40) containing the branch runner (32) is pulled backward, a pure and strong vertical tensile stress is generated at the small point gate (33). Because the cross-sectional area of ​​the point gate (33) is very small, it is the weakest link in the entire gating system and will break instantly under this tensile stress.

[0025] At this point, the gating system and the plastic part (70) are cleanly and automatically separated.

[0026] When the entire mold opening stroke is completed, the sprue plate (10) and plate A (20) reach the maximum mold opening distance. The first limiting plate (53) of the first limiting rod (51) and the stepped structure (54) in the first limiting channel (52) limit the mold to prevent it from opening too much. The separated gating system remains intact in the pull block (40) and can be easily ejected with subsequent ejection actions (e.g., by pushing the pull block through plate A through the ejector pin set on the side of plate B), completing a complete automated production cycle.

[0027] Additional details of preferred embodiments: To ensure that the material pulling block (40) moves smoothly and does not rotate within the cavity space (21), a guide mating structure can be provided between its outer wall and the inner wall of the cavity space (21), such as a guide key and a guide keyway.

[0028] Depending on the size of the plastic part and the number of gates, one or more pull blocks (40) and a corresponding number of second guide mechanisms (60) can be set to ensure uniform pulling force.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A two-plate mold vertical point gate automatic detachment structure, characterized in that, include: Sprue plate (10); Plate A (20), the gate plate (10) is connected to Plate A (20) through a first guide mechanism (50), so that the gate plate (10) can open and close relative to Plate A (20); A sprue (30) having a main runner (31) and at least one branch runner (32); The pull block (40) has a cavity space (21) on the A plate (20) for accommodating the pull block (40), the pull block (40) has a channel (41) through which the branch channel (32) of the gate component (30) passes, and the pull block (40) can move vertically relative to the A plate (20). The sprue plate (10) is connected to the pull block (40) via a second guide mechanism (60). The second guide mechanism (60) is configured to move the pull block (40) relative to the A plate (20) only after the sprue plate (10) has separated from the A plate (20) by a predetermined first stroke.

2. The automatic detachment structure of the vertical point gate in a two-plate mold according to claim 1, characterized in that, The first guiding mechanism (50) includes: At least one first limiting rod (51), one end of which is fixed to the gating plate (10); The A plate (20) is provided with a first limiting channel (52) through which the first limiting rod (51) passes; A first limiting plate (53) is provided at the end of the first limiting rod (51) away from the gate plate (10), and the diameter of the first limiting plate (53) is larger than the diameter of the first limiting rod (51). The first limiting channel (52) is provided with a stepped structure (54) for blocking the first limiting plate (53) to limit the maximum separation distance between the gate plate (10) and the A plate (20).

3. The automatic detachment structure of the vertical point gate in a two-plate mold according to claim 2, characterized in that, The first guiding mechanism (50) further includes at least one guide post (55) disposed on the outside of the gating plate (10), and a guide channel (56) disposed on the A plate (20) and slidingly engaged with the guide post (55).

4. The automatic detachment structure of the vertical point gate in a two-plate mold according to claim 1, characterized in that, The second guiding mechanism (60) includes: At least one second limiting rod (61), one end of which is fixed to the gate plate (10) and passes through the A plate (20); The material pulling block (40) is provided with a second limiting channel (62) through which the second limiting rod (61) passes; A second limiting plate (63) is provided at the end of the second limiting rod (61) away from the gate plate (10), and the diameter of the second limiting plate (63) is larger than the diameter of the second limiting rod (61); The second limiting channel (62) is provided with a stepped structure (64) for cooperating with the second limiting plate (63). The length of the second limiting rod (61) is set such that the second limiting plate (63) abuts against the stepped structure (64) to drive the pulling block (40) to move after the gate plate (10) and the A plate (20) have separated for the first stroke.

5. The automatic detachment structure of the vertical point gate in a two-plate mold according to claim 1, characterized in that, A guide fit structure is provided between the outer wall of the pulling block (40) and the inner wall of the cavity space (21) to guide the pulling block (40) to move stably and vertically within the cavity space (21).

6. The automatic detachment structure of the vertical point gate in a two-plate mold according to claim 1, characterized in that, The main runner (31) of the sprue (30) is housed within the sprue plate (10), and the branch runner (32) of the sprue (30) extends from the sprue plate (10) into the channel (41) of the pull block (40).

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