A thin-walled threaded cup original body injection mold

Abstract

The present invention provides a thin-walled threaded cup original body injection mold, including a core plate and a cavity plate, a working cavity on the core plate, a threaded cup core integrated with the core plate in the middle of the working cavity, the left and right side walls of the working cavity are inclined surfaces with a larger top and a smaller bottom, positioning plates are connected to the left and right side walls of the working cavity, and guide positioning blocks are connected to the front and rear side walls of the working cavity. Two left-right symmetrical guide grooves are processed on the guide positioning blocks, and inclined sliders are arranged in the guide grooves. Two connecting blocks are arranged in the working cavity that are left-right symmetrical about the center of the threaded cup core, and guide grooves are arranged on the outer side walls of the front and rear ends of the connecting blocks. A dovetail groove that penetrates the side walls in the left and right directions is opened at the bottom of the connecting block, and a threaded insert is connected to the connecting block at the outer side of the threaded cup core mouth, and the left and right threaded inserts cover the outer circumferential surface of the entire threaded cup core mouth after being closed. The present invention adopts a threaded insert structure with a core original body structure, which improves production efficiency and effectively ensures the accuracy of the product.

Description

Technical Field

[0001] The invention relates to an injection mold, in particular to an original body injection mold for a thin-wall threaded cup. Background Art

[0002] Thin-walled threaded cups are a very common medical product, which are all produced by mold injection molding. The existing injection mold cores are connected to the core plate by inserts. There are many inserts and the structure is complex. The overall mold size is huge. It can only produce 8 products at most. The mold opening and closing time is more than 20 seconds, which is inefficient. At the same time, due to the excessive number of inserts and poor overall rigidity, the inserts are prone to shifting during the injection molding process. The product has low precision and poor quality. The wall thickness of the thin-walled cup is uneven, and the exhaust of the threaded end of the mouth is poor. Summary of the invention

[0003] In view of the above problems, the present invention aims to provide a core-retaining injection mold for a thin-walled threaded cup, which adopts a core-retaining structure to increase the rigidity and stability of the core and prevent displacement. At the same time, a threaded insert is designed to injection mold the external thread of the threaded cup. The threaded insert opens and closes accordingly with the opening and closing of the mold, has high injection efficiency, reduces the overall mold volume, and greatly increases the number of products injected at one time, thereby improving production efficiency and product precision.

[0004] The technical solution of the present invention is an original body injection mold for a thin-walled threaded cup, comprising a core plate and a cavity plate, wherein a rectangular working cavity is processed on the core plate, a threaded cup core integrated with the core plate is processed in the middle of the working cavity, the left and right side walls of the working cavity are inclined surfaces with a larger top and a smaller bottom, positioning plates are connected to the left and right side walls of the working cavity, and guide positioning blocks are connected to the front and rear side walls of the working cavity, and two left-right symmetrical guide grooves are processed on the guide positioning blocks, and the length direction of the guide groove is parallel to the inclination direction of the positioning plate on the same side, an inclined sliding block is arranged in the guide groove, and two connecting blocks are arranged in the working cavity that are left-right symmetrical about the center of the threaded cup core, and the outer walls of the front and rear ends of the connecting blocks are A guide groove matching the inclined sliding block is provided, a dovetail groove penetrating through the side wall in the left-right direction is provided at the bottom of the connecting block, a corresponding ejector pin is connected to the dovetail groove, and the top of the ejector pin is engaged with the dovetail groove, a threaded insert is connected to the connecting block at the outside of the cup mouth of the threaded cup core, each of the threaded inserts covers half of the cup mouth of the threaded cup core, and the left and right threaded inserts cover the outer circumference of the entire cup mouth of the threaded cup core after closing; a conical positioning block is correspondingly machined on the bottom surface of the cavity plate, and a hole for inserting the threaded cup core is machined in the middle of the conical positioning block, and when the conical positioning block is inserted into the working cavity during mold closing, its four side surfaces are respectively matched with the conical surfaces of the positioning plate and the guide positioning block for positioning.

[0005] Preferably, the two threaded inserts are ejected empty when no product is being molded, which can quickly and conveniently implement cleaning and maintenance of the internal parting surface and cleaning and oiling of the external conical wear block. This saves the number of times and time of upper and lower molds of high-cavity large molds, and realizes daily maintenance actions without leaving the mold.

[0006] Preferably, two threaded cup cores are arranged in the working cavity at intervals along the front-to-back direction, and three dovetail grooves penetrating the left and right side walls of the connecting block are arranged on the bottom surface of the connecting block. The three dovetail grooves are respectively located in the middle position and at the front and rear sides of the two threaded cup cores. A push rod is connected to the dovetail groove in the middle position, and an ejector pin is connected to the dovetail grooves on the front and rear sides. The push rod and the top of the ejector pin are both connected to the ejector plate.

[0007] Preferably, the thread insert is divided into two, four or six pieces, and the dividing line will produce corresponding dividing marks at the thread position of the product, so as to open an exhaust groove at the dividing position to solve the defects of short shot, lack of material and stuffiness at the thread of the thin-walled cup.

[0008] Preferably, a hot runner fixing plate and a fixed mold base plate are also arranged above the cavity plate, a support plate, a mold foot and a movable mold base plate are also arranged below the core plate, and the ejector plate includes an ejector panel and an ejector bottom plate, and the ejector plate is located on the inner side of the mold foot above the movable mold base plate.

[0009] Preferably, the working chambers are arranged in two rows along the front-to-back direction, and the number of each row along the left-to-right direction is 2-6.

[0010] Preferably, a product ejection hole penetrating the core plate is axially arranged in the threaded cup core, and a product ejection rod is correspondingly arranged in the product ejection hole.

[0011] The present invention adopts the core original body retention structure, which increases the rigidity and stability of the core and does not cause displacement. At the same time, the external thread of the threaded cup is designed to be injection molded in the form of a threaded insert. The threaded insert adopts a novel design to perform corresponding opening and closing actions as the mold opens and closes, so that the injection efficiency is increased to more than 3 times the original. The mold opening and closing time can be controlled within 14 seconds, which reduces the overall mold volume, improves production efficiency, and effectively ensures the accuracy of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 It is a schematic diagram of the connection structure between the core plate, the cavity plate, the ejector plate and the movable mold base plate in the present invention;

[0014] Figure 3 for Figure 2 A top view of

[0015] Figure 4 for Figure 3 Cross-sectional view along AA direction;

[0016] Figure 5 for Figure 3 Cross-sectional view along direction BB;

[0017] Figure 6 It is a structural schematic diagram of the core plate and the cavity plate of the present invention;

[0018] Figure 7 It is a schematic diagram of the specific structure of the medium core plate of the present invention;

[0019] Figure 8 for Figure 7 A schematic diagram of the structure after adding a connecting block and a threaded insert;

[0020] Fig. 9 for Figure 8 The main view;

[0021] Fig.10 for Fig. 9 Cross-sectional view along CC direction;

[0022] Fig.11 for Fig. 9 Cross-sectional view along DD direction;

[0023] Fig.12 for Figure 8 Schematic diagram of the structure after the middle connecting block and the threaded insert are ejected;

[0024] Fig.13 for Fig.12 The main view;

[0025] Fig.14 for Fig.13 Cross-sectional view along EE direction;

[0026] Fig.15 for Fig.13 Cross-sectional view along FF direction;

[0027] Among them: 1-core plate; 2-cavity plate; 3-working cavity; 4-threaded cup core; 5-positioning plate; 6-guide positioning block; 7-guide groove; 8-inclined slider; 9-connecting block; 10-dovetail groove; 11-ejector; 12-threaded insert; 13-conical positioning block; 14-ejector rod; 15-ejector plate; 16-hot runner fixing plate; 17-fixed mold base plate; 18-support plate; 19-mold foot; 20-movable mold base plate; 21-ejector panel; 22-ejector bottom plate. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] like Figures 2 to 15 As shown, the present invention provides an original injection mold for a thin-walled threaded cup, comprising a core plate 1 and a cavity plate 2, wherein a rectangular working cavity 3 is processed on the core plate 1, a threaded cup core 4 which is integrated with the core plate 1 is processed in the middle of the working cavity 3, the left and right side walls of the working cavity 3 are inclined surfaces which are larger at the top and smaller at the bottom, positioning plates 5 are connected to the left and right side walls of the working cavity 3, and guide positioning blocks 6 are connected to the front and rear side walls of the working cavity 3, and two left-right symmetrical guide grooves 7 are processed on the guide positioning blocks 6, the length direction of the guide grooves 7 is parallel to the inclination direction of the positioning plates 5 on the same side, an inclined sliding block 8 is arranged in the guide groove 7, two connecting blocks 9 which are left-right symmetrical about the center of the threaded cup core 4 are arranged in the working cavity 3, guide grooves 7 which match the inclined sliding block 8 are arranged on the outer side walls at the front and rear ends of the connecting blocks 9, a dovetail groove 10 which runs through its side walls in the left-right direction is opened at the bottom of the connecting block 9, a corresponding ejector pin 11 is connected to the dovetail groove 10, and the top of the ejector pin 11 The dovetail groove 10 is engaged with the connection block 9, and a threaded insert 12 is connected to the outer side of the cup mouth of the threaded cup core 4. The bottom surface of the threaded insert 12 is connected to the connection block 9, and the inner side surface of the threaded insert 12 is processed with threads. Each of the threaded inserts 12 covers half of the cup mouth of the threaded cup core 4. After the left and right threaded inserts 12 are closed, they cover the outer circumference of the entire cup mouth of the threaded cup core 4; the bottom surface of the cavity plate 2 is processed with a conical positioning block 13, and the conical positioning block 13 is A hole for inserting the threaded cup core 4 is processed in the part. When the conical positioning block 13 is inserted into the working cavity 3 during mold closing, its four sides are respectively matched with the conical surfaces of the positioning plate 5 and the guide positioning block 6 for positioning. The existence of the conical positioning block 13 ensures the stability and accuracy of mold closing. A product ejection hole that penetrates the core plate 1 is axially arranged in the threaded cup core 4, and a product ejection rod is correspondingly arranged in the product ejection hole. When demolding, the product ejection rod quickly ejects the product after injection molding, thereby shortening the working time.

[0030] Preferably, two threaded cup cores 4 are arranged at intervals in the front-to-back direction in the working chamber 3, and three dovetail grooves 10 penetrating the left and right side walls of the connecting block 9 are arranged on the bottom surface of the connecting block 9. The three dovetail grooves 10 are respectively located in the middle position and at the front and rear sides of the two threaded cup cores 4. The dovetail groove 10 in the middle position is connected to a push rod 14, and the dovetail grooves 10 on the front and rear sides are connected to an ejector pin 11. The tops of the push rod 14 and the ejector pins 11 are both connected to an ejector pin plate 15. The working chamber 3 is arranged in two rows in the front-to-back direction, and the number of each row along the left and right direction is 2-6.

[0031] Preferably, Figure 1As shown, a hot runner fixing plate 16 and a fixed mold base plate 17 are also arranged above the cavity plate 2, and a support plate 18, a mold foot 19 and a movable mold base plate 20 are also arranged below the core plate 1. The ejector plate 15 includes an ejector panel 21 and an ejector bottom plate 22. The ejector plate 15 is located on the inner side of the mold foot 19 above the movable mold base plate 20.

[0032] During operation, when the mold is in the closed state, Figure 3 , 4 , 5, 8, 9, 10, and 11, the connecting block 9 and the threaded insert 12 are located at the bottom of the working cavity 3, and the left and right threaded inserts 12 cover the cup mouth of the threaded cup core 4. During injection molding, the molten plastic passes through the fixed mold base plate 17 and the hot runner fixed plate 16 and then enters the product filling area between the cavity plate 2 and the core plate 1. After the injection molding is completed, the mold is opened, as shown in FIG. Fig.12 , 13 As shown in 14 and 15, the ejector plate 15 controls the ejector 11 and the ejector rod 14 to push upward. The ejector 11 and the ejector rod 14 can slide freely along the length direction in the dovetail groove 10 of the connecting block 9. When the connecting block 9 moves upward, it will be restricted by the inclined slider 8 and the guide groove 7 and finally move upward along the direction of the guide groove 7 while opening to both sides. The threaded insert 12 moves synchronously with the positioning block 9, and is separated from the product position to facilitate the product to be ejected. The product after injection molding can be freely taken out or quickly ejected by the product ejector rod in the product ejection hole. After the product is taken out, the mold is closed. When the ejector plate 15 is reset, it drives the ejector 11 and the ejector rod 14 to move downward. The connecting block 9 and the threaded insert 12 move downward and inward along the inclined slider 8 to reset to wait for the next injection molding. Among them, the presence of the conical positioning block 13 during the opening and closing of the mold ensures the stability and accuracy of the closing action between the core plate 1 and the cavity plate 2.

[0033] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the invention. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A thin-walled threaded cup original body injection mold, comprising a core plate (1) and a cavity plate (2), characterized in that: The core plate (1) is processed with a rectangular working cavity (3), the middle of the working cavity (3) is processed with a threaded cup core (4) which is integrated with the core plate (1), the left and right side walls of the working cavity (3) are inclined surfaces which are larger at the top and smaller at the bottom, the left and right side walls of the working cavity (3) are connected with positioning plates (5), the front and rear side walls of the working cavity (3) are connected with guide positioning blocks (6), the guide positioning blocks (6) are processed with two left-right symmetrical guide grooves (7), the length direction of the guide grooves (7) is parallel to the inclination direction of the positioning plate (5) on the same side, an inclined slide block (8) is arranged in the guide groove (7), the working cavity (3) is provided with two left-right symmetrical connecting blocks (9) about the center of the threaded cup core (4), the front and rear outer side walls of the connecting blocks (9) are provided with guide grooves (7) matching the inclined slide block (8), the connecting blocks (9) ) is provided with a dovetail groove (10) penetrating through its side wall in the left-right direction at the bottom, the dovetail groove (10) is connected to a corresponding ejector pin (11), the top of the ejector pin (11) is engaged with the dovetail groove (10), and a thread insert (12) is connected to the connection block (9) at the outer side of the cup mouth of the threaded cup core (4), each of the thread inserts (12) covers half of the cup mouth of the threaded cup core (4), and the left and right thread inserts (12) cover the outer circumference of the cup mouth of the entire threaded cup core (4) after being closed; the bottom surface of the cavity plate (2) is correspondingly processed with a conical positioning block (13), and the middle part of the conical positioning block (13) is processed with a hole for inserting the threaded cup core (4), and when the mold is closed, the conical positioning block (13) is inserted into the working cavity (3) and its four side surfaces are respectively matched with the conical surfaces of the positioning plate (5) and the guide positioning block (6) for positioning.

2. The original injection mold of a thin-walled threaded cup according to claim 1, characterized in that: Two threaded cup cores (4) are arranged in the working chamber (3) at intervals along the front-to-back direction. The bottom surface of the connecting block (9) is provided with three dovetail grooves (10) penetrating the left and right side walls of the connecting block (9). The three dovetail grooves (10) are respectively located in the middle and at the front and rear sides of the two threaded cup cores (4). The dovetail groove (10) in the middle is connected to a push rod (14), and the dovetail grooves (10) at the front and rear sides are connected to a push pin (11). The tops of the push rod (14) and the push pin (11) are both connected to a push pin plate (15).

3. The original injection mold of a thin-walled threaded cup according to claim 2, characterized in that: A hot runner fixing plate (16) and a fixed mold base plate (17) are also provided above the cavity plate (2); a support plate (18), a mold foot (19) and a movable mold base plate (20) are also provided below the core plate (1); the ejector plate (15) comprises an ejector face plate (21) and an ejector bottom plate (22); and the ejector plate (15) is located on the inner side of the mold foot (19) above the movable mold base plate (20).

4. The original injection mold of a thin-walled threaded cup according to claim 2, characterized in that: The working chambers (3) are arranged in two rows along the front-to-back direction, and the number of each row along the left-to-right direction is 2-6.

5. The original injection mold of a thin-walled threaded cup according to claim 1, characterized in that: A product ejection hole penetrating the core plate (1) is axially arranged inside the threaded cup core (4), and a product ejection rod is correspondingly arranged inside the product ejection hole.

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