An automatic dewatering gate injection mold

Abstract

This utility model discloses an automatic dewatering injection mold, comprising a top plate, an upper mold, a lower mold, and a bottom plate arranged sequentially from top to bottom. The upper surface of the upper mold has a pusher groove, within which a matching pusher block is disposed. The upper surface of the pusher block is flush with the upper surface of the upper mold. The bottom surface of the top plate has a runner groove, and the top plate has an injection port communicating with the runner groove. The upper mold has multiple pull holes, each containing a pull rod. The upper end of the pull rod passes through the pusher block and is fixedly connected to the top plate, while the lower end of the pull rod has a pull head. This utility model incorporates a pusher block in the upper mold of a two-plate mold structure. The pull rod connected to the top plate then drives the pusher block to detach from the upper mold, automatically removing the sprue material. The design is simple, easy to operate, and highly automated, providing a new design direction for dewatering actions in mold design and promoting the development of the mold industry.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an automatic dewatering injection mold. Background Technology

[0002] The sprue, also known as the gate, is the channel through which molten plastic flows into the mold cavity during injection molding. It is a key component connecting the injection molding machine nozzle and the mold cavity, and an indispensable part of the injection mold. However, achieving rapid sprue removal in injection molds has limited production efficiency. Therefore, various automatic sprue removal methods have emerged in existing mold designs. The mainstream method for sprue removal in existing injection molds is to use sprue ejector pins for ejection, especially in two-plate molds with only upper and lower molds. Due to the simple structure, there is still no good way to achieve automatic sprue removal. Some methods place the sprue on the slide or use hooks to achieve sprue removal. In common three-plate molds, a push plate is set between the upper and lower molds, and the sprue is placed on the push plate for sprue removal. However, three-plate molds require sprue retainers to ensure that the sprue stays on the push plate during mold parting, and ultimately, manual or robotic removal of the sprue is still required. This has led to the current situation where existing injection molds, whenever involving the design of automatic dewatering ports, often have complex mold structures, increasing production costs and hindering energy conservation. Therefore, we need an injection mold with a simplified structure that can achieve automatic dewatering ports in order to achieve energy conservation in automated production. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by proposing an automatic dewatering injection mold.

[0004] To achieve the above objectives, an automatic dewatering injection mold includes a top plate, an upper mold, a lower mold, and a bottom plate arranged sequentially from top to bottom. The upper surface of the upper mold has a pusher groove, and a matching pusher block is provided in the pusher groove. The upper surface of the pusher block is on the same plane as the upper surface of the upper mold. The bottom surface of the top plate has a runner groove, and the top plate has an injection port that communicates with the runner groove. The pusher block is located within the coverage area of ​​the runner groove. The upper mold has multiple pull holes, and pull rods are respectively provided in the pull holes. The upper end of the pull rod passes through the pusher block and is fixedly connected to the top plate. The lower end of the pull rod is provided with a pull head.

[0005] During mold parting, the top plate detaches first, and the injection sprue material adheres to the upper surface of the upper mold. After the top plate moves a certain distance, the pull rod drives the push block to detach from the upper mold. The push block carries the sprue material out of the upper mold, and when the push block reaches the end of its stroke, the sprue material automatically falls off due to inertia. This fully automated mechanical sprue removal eliminates the need for hooks to pick up the sprue material or ejector pins to push it out. It also eliminates the need for manual or robotic demolding, effectively achieving automatic sprue removal in two-plate molds. With its simple structure and high practicality, it provides a new direction for automatic sprue removal in mold design.

[0006] Preferably, the upper mold is provided with a plurality of pull die through holes away from the pusher block, and pull die rods are respectively provided in the pull die through holes. The upper end of the pull die rod is fixedly connected to the top plate, and the lower end of the pull die rod is provided with a pull die head. A limiting platform is provided in the pull die through hole to restrict the passage of the pull die head.

[0007] During mold separation, the mold pull rod moves within the mold pull through hole. When the stroke reaches the limit platform, the mold pull rod can drive the upper mold to separate, completing the automatic mold separation action.

[0008] Preferably, the upper mold is provided with a cavity, the lower mold is provided with a punch insert extending into the cavity, the cavity is provided with a flow channel hole communicating with a flow channel groove, and the flow channel hole is a tapered structure that is wider at the top and narrower at the bottom.

[0009] The sprue material enters the mold cavity through the runner hole to complete the injection molding. The runner hole structure, which is wider at the top and narrower at the bottom, makes it easier for the sprue material to leave the runner hole during the desprue process.

[0010] Preferably, support plates are provided on both sides of the base plate, and the support plates separate the base plate and the lower mold to form a demolding space. The demolding space is provided with a fixed plate and a top plate stacked on top of each other. A top block is provided at the upper end of the punch insert. The top block can be movably embedded into the upper end of the punch insert and its upper surface constitutes part of the punch insert. The top plate is provided with an upwardly extending push rod. The push rod can movably pass through the lower mold and the punch insert and its upper end is fixedly connected to the top block.

[0011] When the product is demolded, the ejector plate drives the push rod to move, and the push rod drives the ejector block to detach from the punch insert, thus ejecting the product attached to the punch insert and completing the product demolding action.

[0012] Preferably, the bottom plate is provided with a plurality of ejection through holes, which are located in the area covered by the top plate.

[0013] Ejection through holes are used by the corresponding ejection structure of the injection molding machine to extend into and drive the ejector plate to move.

[0014] Preferably, the top plate is provided with multiple reset rods passing through the lower mold, and the reset rod portion between the fixed plate and the lower mold is fitted with a reset spring.

[0015] The reset rod and reset spring work together to provide a buffer when the product is demolded and to use elastic potential energy to drive the top plate to reset.

[0016] Preferably, the bottom of the top plate is provided with multiple elastic buffer pads.

[0017] The elastic buffer pad can buffer the top plate when it resets, preventing the top plate from directly impacting the bottom plate.

[0018] Preferably, the base plate is provided with a plurality of upwardly extending support columns, the upper ends of which pass through the top plate and the fixing plate and extend to the bottom surface of the lower mold.

[0019] Support columns are used to fix the demolding space and ensure the accuracy of the distance between the base plate and the lower mold.

[0020] Preferably, the top plate is provided with four guide pillars in a rectangular array, the guide pillars passing through the upper mold, the lower mold, and the support plate in sequence, and the upper mold, the lower mold, and the support plate are respectively provided with guide sleeves that match the guide pillars.

[0021] The cooperation between the guide pillars and guide bushings ensures the positional accuracy between the upper and lower structures of the mold, and also provides guidance for the parting and closing of the upper and lower molds.

[0022] Preferably, the lower mold is provided with a plurality of upwardly protruding positioning blocks, and the upper mold is provided with positioning grooves corresponding to the positioning blocks.

[0023] The placement of positioning blocks and positioning slots further improves the accuracy of mold closing between the upper and lower molds.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] This utility model features a pusher block installed on the upper mold of a two-plate mold structure. During mold separation, the top plate detaches first, and the pull rod connected to the top plate then drives the pusher block to detach from the upper mold. The pusher block drives the sprue material to automatically fall off, realizing the automatic sprue removal action of the two-plate mold. The structure is simple, the operation is easy, and the automation effect is good. It provides a new design direction for the sprue removal action of mold design and promotes the development of the mold industry. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the embodiments will be briefly introduced below.

[0027] Figure 1 This is a schematic diagram of the structure of this utility model.

[0028] Figure 2 This is a schematic diagram of the exploded structure of this utility model.

[0029] Figure 3 This is a partial structural schematic diagram of the present invention.

[0030] Figure 4 This is a partial structural schematic diagram of the present invention.

[0031] Figure 5 This is a schematic diagram of the lower mold part of this utility model.

[0032] Figure 6 This is a schematic diagram of the upper mold part of this utility model.

[0033] Figure 7 This is a partial structural schematic diagram of the present invention.

[0034] Figure 8 This is a partial structural schematic diagram of the present invention.

[0035] Figure 9 This is a schematic diagram of the bottom structure of this utility model. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0037] This utility model provides an automatic dewatering injection mold, such as Figures 1-9 As shown, it includes a top plate 1, an upper mold 2, a lower mold 3 and a bottom plate 5 arranged from top to bottom. Support plates 4 are respectively provided on both sides of the bottom plate 5. The support plates 4 separate the bottom plate 5 and the lower mold 3 to form a demolding space. A fixed plate 6 and a top plate 7 are arranged stacked on top of each other in the demolding space.

[0038] The upper mold 2 is provided with multiple concave cavities 21, and the lower mold 3 is provided with multiple punch inserts 31 that extend into the concave cavities 21 respectively. The cooperation between each punch insert 31 and the concave cavity 21 constitutes a single product injection cavity. The upper surface of the upper mold 2 is provided with a pusher groove 28, and a matching pusher block 8 is provided in the pusher groove 28. The pusher block 8 can be moved away from the pusher groove 28. The upper mold 2 is provided with multiple pull holes 26, which are perpendicular to the upper mold 2 and penetrate the upper mold 2. Pull rods 27 are provided in the pull holes 26 respectively. The upper end of the pull rod 27 passes through the pusher block 8 and is fixedly connected to the top plate 1. The lower end of the pull rod 27 is provided with a pull head 271. The upper mold 2 is provided with multiple pull-die through holes 22 away from the pusher block 8. The pull-die through holes 22 are perpendicular to the upper mold 2 and penetrate the upper mold 2. Pull-die rods 23 are respectively provided in the pull-die through holes 22. The upper end of the pull-die rod 23 is fixedly connected to the top plate 1. The lower end of the pull-die rod 23 is provided with a pull-die head 231. A limiting platform 221 is provided in the pull-die through holes 22 to restrict the passage of the pull-die head 231. The mold parting is carried out in three stages: in the first stage, the top plate 1 separates; in the second stage, when the top plate 1 travels to a predetermined distance, the pull-die head 271 contacts the bottom surface of the pusher block 8, and the pull-die rod 34 begins to drive the pusher block 8 to disengage from the pusher groove 28, and the pusher block 8 separates; in the third stage, when the top plate 1 continues to move to the next predetermined distance, the pull-die head 231 contacts the limiting platform 221, the pull-die rod 23 drives the upper mold 2 to move, and the upper mold 2 separates, completing the mold parting action.

[0039] The upper surface of the pusher block 8 is on the same plane as the upper surface of the upper mold 2. The bottom surface of the top plate 1 is provided with a runner groove 11. The top plate 1 is provided with an injection port 12 that communicates with the runner groove 11. The cavity 21 is provided with a runner hole 24 that communicates with the runner groove 11. The runner hole 24 has a tapered structure that is wider at the top and narrower at the bottom. During injection molding, the raw material enters the runner groove 11 through the injection port 12, flows through the runner groove 11 and through each runner hole 24 into the cavity 21 to complete the injection molding.

[0040] The pusher block 8 is located within the coverage area of ​​the runner groove 11. When the top plate 1 separates, the top plate 1 detaches and exposes the cooled and solidified sprue material. At this time, the lower end of the sprue material is still connected to the product in the cavity through the runner hole 24, and is therefore fixed to the upper surface of the upper mold 2. When the pusher block 8 separates, the pusher block 8 drives the sprue material to disconnect from the product in the cavity, realizing the sprue detachment. At this time, the sprue material gradually detaches from the runner hole 24. When the pusher block 8 moves to the end of the stroke, the sprue material automatically detaches from the upper mold 2 due to inertia, completing the automatic sprue removal action.

[0041] The upper end of the punch insert 31 is provided with an ejector block 35. The ejector block 35 can be movably embedded into the upper end of the punch insert 31, and its upper surface forms part of the punch insert 31. The ejector plate 7 is provided with an upwardly extending push rod 71. The push rod 71 is perpendicular to the ejector plate 7 and the lower mold 3. The push rod 71 can movably pass through the lower mold 3 and the punch insert 31, and its upper end is fixedly connected to the ejector block 35. The base plate 5 is provided with multiple ejection through holes 51, which are located in the area covered by the ejector plate 7. After the upper mold 2 separates from the product, the injection molding machine pushes the ejector plate 7 to move through the ejection through holes 51. At this time, the push rod 71 drives the ejector block 35 to separate from the punch insert 31, ejecting the product attached to the punch insert 31, thus completing the product injection molding separation.

[0042] The top plate 7 is provided with multiple reset rods 72 that can move through the lower mold 3. The reset rods 72 are arranged in a rectangular array. The reset rods 72 between the fixed plate 6 and the lower mold 3 are fitted with reset springs 73. When the top plate 7 and the fixed plate 6 move closer to the lower mold 3 to demold the product of the punch insert 31, the reset springs 73 act as a buffer to prevent the top plate 35 from damaging the product. When the mold is closed, the reset springs 73 use their elastic potential energy to drive the top plate 7 and the fixed plate 6 to automatically reset. The bottom of the top plate 7 is provided with multiple elastic buffer pads 74 to buffer when the top plate 7 resets, preventing the top plate 7 from directly impacting the bottom plate 5.

[0043] The base plate 5 is provided with a plurality of upwardly extending support columns 52. The upper ends of the support columns 52 pass through the top plate 7 and the fixing plate 6 and extend to the bottom surface of the lower mold 3. The support columns 52 support the demolding space and ensure a fixed distance between the base plate 5 and the upper mold 2.

[0044] The top plate 1 is provided with four guide pillars 9 arranged in a rectangular array. The guide pillars 9 penetrate vertically downward through the upper mold 2, the lower mold 3, and the support plate 4 in sequence. The upper mold 2, the lower mold 3, and the support plate 4 are each provided with a guide sleeve 91 that matches the guide pillar 9. The cooperation between the guide pillar 9 and the guide sleeve 91 is used to guide the parting of the upper mold 2 and the lower mold 3.

[0045] The lower mold 3 is provided with multiple upwardly protruding positioning blocks 36, and the upper mold 2 is provided with positioning grooves 25 corresponding to the positioning blocks 36. When the upper mold 2 and the lower mold 3 are closed, the positioning blocks 36 and the positioning grooves 25 make priority contact, and the cooperation between the positioning blocks 36 and the positioning grooves 25 ensures the accuracy of mold closing.

[0046] Working principle:

[0047] After injection molding, the mold is separated. First, the top plate 1 detaches, and the solidified sprue material adheres to the upper surface of the upper mold 2. The pull rod 27 moves within the pull through hole 26, while the pull rod 23 moves within the pull through hole 22. When the top plate 1 has moved a certain distance, the pull head 271 touches the bottom of the push block 8, causing the push block 8 to move. The push block 8 moves the sprue material and simultaneously drives the sprue material at the end of the runner hole 24 to disconnect from the product in the cavity. The sprue material is carried away by the push block 8. When the push block 8 reaches the end of its stroke... When the injection molding machine reaches the next position, the sprue material is automatically detached from the pusher block 8 due to inertia, completing the automatic sprue removal action. When the top plate 1 continues to move to the next position, the pull mold head 231 contacts the limit platform 221. The pull mold head 231 drives the upper mold 2 to move, the upper mold 2 is demolded, and the product is attached to the punch insert 31. Finally, the injection molding machine drives the ejector plate 7 to move through the ejection through hole 51. The ejector plate 7 drives the ejector block 35 to move through the push rod 71. The ejector block 35 is detached from the punch insert 31, ejecting the product and completing the automatic product removal.

[0048] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An automatic dewatering injection mold, characterized in that, The device includes a top plate, an upper mold, a lower mold, and a bottom plate arranged sequentially from top to bottom. The upper surface of the upper mold has a pusher groove, and a matching pusher block is provided in the pusher groove. The upper surface of the pusher block is on the same plane as the upper surface of the upper mold. The bottom surface of the top plate has a runner groove, and the top plate has an injection port that communicates with the runner groove. The pusher block is located within the coverage area of ​​the runner groove. The upper mold has multiple pull holes, and pull rods are respectively provided in the pull holes. The upper end of the pull rod passes through the pusher block and is fixedly connected to the top plate. The lower end of the pull rod is provided with a pull head.

2. The automatic dewatering injection mold according to claim 1, characterized in that, The upper mold is provided with multiple pull-die through holes away from the pusher block. Pull-die rods are respectively provided in the pull-die through holes. The upper end of the pull-die rod is fixedly connected to the top plate. The lower end of the pull-die rod is provided with a pull-die head. A limiting platform is provided in the pull-die through hole to restrict the passage of the pull-die head.

3. The automatic dewatering injection mold according to claim 1, characterized in that, The upper mold is provided with a cavity, and the lower mold is provided with a punch insert extending into the cavity. The cavity is provided with a flow channel hole that communicates with a flow channel groove. The flow channel hole is a tapered structure that is wider at the top and narrower at the bottom.

4. The automatic dewatering injection mold according to claim 3, characterized in that, Support plates are provided on both sides of the base plate, and the support plates separate the base plate and the lower mold to form a demolding space. The demolding space is provided with a fixed plate and an ejector plate stacked on top of each other. An ejector block is provided at the upper end of the punch insert. The ejector block can be movably embedded into the upper end of the punch insert and its upper surface constitutes part of the punch insert. The ejector plate is provided with an upwardly extending push rod. The push rod can movably pass through the lower mold and the punch insert and its upper end is fixedly connected to the ejector block.

5. An automatic dewatering injection mold according to claim 4, characterized in that, The base plate is provided with multiple ejection through holes, which are located within the area covered by the top plate.

6. The automatic dewatering injection mold according to claim 5, characterized in that, The top plate is provided with multiple reset rods that pass through the lower mold, and the reset rod portion between the fixed plate and the lower mold is fitted with a reset spring.

7. An automatic dewatering injection mold according to claim 6, characterized in that, The bottom of the top plate is provided with multiple elastic buffer pads.

8. An automatic dewatering injection mold according to claim 7, characterized in that, The base plate is provided with multiple upward-extending support columns, the upper ends of which pass through the top plate and the fixing plate and extend to the bottom surface of the lower mold.

9. An automatic dewatering injection mold according to claim 1, characterized in that, The top plate is provided with four guide pillars in a rectangular array. The guide pillars pass through the upper mold, lower mold, and support plate in sequence. The upper mold, lower mold, and support plate are respectively provided with guide sleeves that match the guide pillars.

10. An automatic dewatering injection mold according to claim 1, characterized in that, The lower mold is provided with multiple upwardly protruding positioning blocks, and the upper mold is provided with positioning grooves corresponding to the positioning blocks.

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