Leak-proof injection head

Abstract

The utility model relates to the field of injection head, concretely relates to a leakage-proof injection head, including injection pipe for conveying melt, fixed block is fixed in the upper and lower sides of injection pipe, the inside of injection pipe is provided with internal thread. A leakage-proof injection head, through the setting of injection head main part, joint frame, threaded rod, moving seat, limit block, movable shaft, sealing plate, stainless steel spring and stainless steel sealing element, through the connection between injection head main part and injection pipe through the threaded mode, when the helical blade in the conduit extrudes melt to enter injection pipe and injection head main part, melt will produce certain pressure and push four sets of sealing plates in injection head main part, make four sets of sealing plates unfold, thereby extruding melt through injection head main part into mould, and lose melt extrusion, four sets of sealing plates rebound through the stainless steel spring behind and push four sets of sealing plates to merge together, thereby play the role of preventing melt leakage.

Description

Technical Field

[0001] This utility model relates to the field of injection molding heads, specifically to a leak-proof injection molding head. Background Technology

[0002] In the mold industry, molds and tools are used to obtain the desired products through injection molding, blow molding, extrusion, die casting or forging, smelting, stamping and other methods. Injection molding machines are the main molding equipment that uses plastic molds to make plastic products of various shapes from thermoplastic or thermosetting plastics. The injection head is one of the important components of the injection molding machine.

[0003] A search revealed a utility model, CN217531662U, for an easily disassembled and replaceable injection head. The head includes an injection head, an injection conduit, and a fixing component. One end of the injection head has a connecting groove. One end of the injection conduit is sleeved onto the injection head, and this end has a connecting cavity. A connecting structure that mates with the connecting groove is installed within the connecting cavity. The connecting structure includes a limiting protrusion adapted to the connecting groove. A movable piece extends outward from the limiting protrusion. A return spring is located below the movable piece. When installing the injection head, pushing it into the injection conduit compresses the limiting protrusion of the connecting structure, causing it to retract into the connecting cavity, while the limiting protrusion retracts into the movable cavity. When pushed to its limit, the connecting groove and the limiting protrusion are aligned. Under the action of the return spring, the limiting protrusion rebounds and mates with the connecting groove, completing the initial fixing of the injection head. The fixing component is then inserted from the injection port end of the injection head and locked via a threaded connection, completing the installation.

[0004] Traditional injection heads typically employ a single sealing structure, such as an O-ring seal or a flat seal. While O-ring seals offer some sealing performance, they are prone to aging and deformation under high temperature, high pressure, and frequent opening and closing, leading to seal failure. When the injection pressure is too high, the molten plastic may break through the seal, causing leakage. Conversely, when the injection pressure is too low, the molten plastic may not be able to fully fill the mold, affecting injection quality. In contrast, the injection heads in the aforementioned comparative case, which are easy to disassemble and replace, lack sealing measures during disassembly and replacement, making them susceptible to leakage.

[0005] Therefore, it is necessary to invent a leak-proof injection head to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a leak-proof injection head. The injection head body is connected to the injection tube via threads. After connection, the connecting frames on the upper and lower sides of the injection head body are rotated, allowing the movable seat and limiting block inside the connecting frame to place on the fixed block outside the injection tube. Then, rotating the threaded rod inside the connecting frame causes the movable seat and limiting block to insert into the limiting groove inside the fixed block, thereby strengthening the connection and sealing. When the spiral blades inside the guide tube compress the melt into the injection tube and injection head body, the melt generates pressure that pushes the four sets of sealing plates inside the injection head body, causing them to unfold and extruding the melt through the injection tube. When the injection head enters the mold and the molten material is no longer extruded, the four sets of sealing plates are pushed together by the stainless steel springs on the rear side, thus preventing molten material leakage. This addresses the issue mentioned in the background technology that traditional injection heads typically use a single sealing structure, such as O-ring seals or flat seals. While O-ring seals have a certain sealing performance, they are prone to aging and deformation under high temperature, high pressure, and frequent opening and closing, leading to seal failure. When the injection pressure is too high, the molten plastic may break through the sealing structure, causing leakage; while when the injection pressure is too low, it may not be able to ensure that the molten plastic fully fills the mold, affecting the injection molding quality.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a leak-proof injection head, including an injection tube for conveying melt; A fixing block is fixed on the upper and lower sides of the injection molding tube, and the injection molding tube has an internal thread inside. The injection head body is threaded to the front end of the injection tube. The rear end of the injection head body has an external thread. A second sealing ring is embedded on the rear side of the injection head body. Connecting blocks are fixedly connected to the upper and lower sides of the injection head body. A movable block is rotatably connected inside the connecting blocks. A connecting frame is fixedly connected above the movable block. A threaded rod passes through the internal thread of the connecting frame. A movable seat is connected to the external thread of the threaded rod. A limit block is fixedly connected to the lower front end of the movable seat. The movable shafts are all hinged to the inner wall of the injection head body. A sealing plate is fixedly connected to the outside of the movable shaft, and a stainless steel spring is fixedly connected to the rear side of the sealing plate.

[0008] Preferably, a threaded post is fixedly connected to the rear end of the injection-molded tube, and a first sealing ring is embedded on the rear side of the injection-molded tube.

[0009] Preferably, the movable block is rotatably connected to the injection head body, and the movable seat is slidably connected to the connecting frame.

[0010] Preferably, the limiting block below the front end of the movable seat is movably engaged with the fixing blocks on the upper and lower sides of the injection molding tube, and the fixing block has a limiting groove inside that matches the limiting block.

[0011] Preferably, four sets of sealing plates are provided, and the sealing plates are rotatably connected to the injection head body via a movable shaft. The upper end of the stainless steel spring is fixedly connected to the inside of the injection head body.

[0012] Preferably, stainless steel sealing elements are embedded on both outer sides of the sealing plate.

[0013] The technical effects and advantages provided by this utility model in the above technical solution are as follows: This invention enhances the sealing effect during the injection molding process and the sealing effect between connections by setting up an injection head body, a connecting frame, a threaded rod, a movable seat, a limiting block, a movable shaft, sealing plates, stainless steel springs, and stainless steel seals, thus preventing leakage. The injection head body and the injection tube are connected by threads. After the connection is in place, the connecting frames on the upper and lower sides of the injection head body are rotated, allowing the movable seat and limiting block inside the connecting frame to place on the fixed block outside the injection tube. Then, rotating the threaded rod inside the connecting frame drives the movable seat and limiting block to insert into the limiting groove inside the fixed block, thereby strengthening the connection and sealing. When the spiral blades inside the guide tube compress the melt into the injection tube and the injection head body, the melt generates a certain pressure that pushes the four sets of sealing plates inside the injection head body, causing them to unfold and extruding the melt through the injection head body into the mold. When the melt compression is lost, the four sets of sealing plates are pushed back by the stainless steel springs on the rear side, causing them to merge together, thus preventing melt leakage. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the injection head body and injection tube structure of this utility model; Figure 3 This is a schematic diagram of the injection tube structure of this utility model; Figure 4 This is a schematic cross-sectional view of the main body of the injection head of this utility model; Figure 5 This is a schematic diagram of the sealing plate structure of this utility model; Figure 6 For the present utility model Figure 3 Enlarged view of the structure at point A in the middle.

[0016] Explanation of reference numerals in the attached figures: 1. Injection tube; 2. Threaded post; 3. First sealing ring; 4. Fixing block; 5. Internal thread; 6. Injection head body; 7. External thread; 8. Second sealing ring; 9. Connecting block; 10. Movable block; 11. Connecting frame; 12. Threaded rod; 13. Moving seat; 14. Limiting block; 15. Movable shaft; 16. Sealing plate; 17. Stainless steel spring; 18. Stainless steel seal. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0018] This utility model provides, for example Figure 1-6 The leak-proof injection head shown includes an injection tube 1 for conveying melt; The fixing block 4 is fixed on the upper and lower sides of the injection tube 1. The injection tube 1 has an internal thread 5 inside. The injection head body 6 is threaded to the front end of the injection tube 1. The rear end of the injection head body 6 is provided with an external thread 7. A second sealing ring 8 is embedded on the rear side of the injection head body 6. Connecting blocks 9 are fixedly connected to the upper and lower sides of the injection head body 6. A movable block 10 is rotatably connected inside the connecting block 9. A connecting frame 11 is fixedly connected above the movable block 10. A threaded rod 12 passes through the internal thread of the connecting frame 11. A movable seat 13 is connected to the external thread of the threaded rod 12. A limit block 14 is fixedly connected to the lower front end of the movable seat 13. The movable shafts 15 are all hinged to the inner wall of the injection head body 6. A sealing plate 16 is fixedly connected to the outside of the movable shafts 15, and a stainless steel spring 17 is fixedly connected to the rear side of the sealing plate 16. The injection head body 6 and the injection tube 1 are connected by threads. After the connection is in place, the connecting brackets 11 on the upper and lower sides of the injection head body 6 are rotated so that the movable seat 13 and the limiting block 14 inside the connecting bracket 11 are placed on the fixed block 4 outside the injection tube 1. Then, the threaded rod 12 inside the connecting bracket 11 is rotated to drive the movable seat 13 and the limiting block 14 to insert into the fixed block 4. The limiting groove inside the fixed block 4 enhances the connection and sealing between them. Then, when the spiral blades inside the guide tube squeeze the melt into the injection tube 1 and the injection head body 6, the melt will generate a certain pressure to push the four sets of sealing plates 16 inside the injection head body 6, causing the four sets of sealing plates 16 to unfold, thereby squeezing the melt through the injection head body 6 into the mold. When the melt extrusion is lost, the four sets of sealing plates 16 are pushed back by the stainless steel spring 17 on the rear side to merge together, thereby preventing melt leakage.

[0019] like Figure 1 and Figure 2As shown, a threaded post 2 is fixedly connected to the rear end of the injection tube 1, and a first sealing ring 3 is embedded on the rear side of the injection tube 1. The injection tube 1 is threadedly connected to the guide tube through the threaded post 2 on the rear side. At the same time, the first sealing ring 3 is embedded on the rear side of the injection tube 1 to enhance the sealing between the injection tube 1 and the guide tube.

[0020] like Figure 2 , Figure 3 and Figure 6 As shown, the movable block 10 is rotatably connected to the injection head body 6, and the movable seat 13 is slidably connected to the connecting frame 11. By rotating the connecting frames 11 on the upper and lower sides of the injection head body 6, the movable seat 13 and the limiting block 14 inside the connecting frame 11 are placed on the fixed block 4 outside the injection tube 1. Then, the threaded rod 12 inside the connecting frame 11 is rotated to drive the movable seat 13 to move within the connecting frame 11, thereby adjusting the length of the movable seat 13.

[0021] like Figure 2 and Figure 6 As shown, the limiting block 14 at the lower front end of the movable seat 13 is movably engaged with the fixing blocks 4 on the upper and lower sides of the injection tube 1. The fixing blocks 4 have a limiting groove inside that matches the limiting block 14. By rotating the threaded rod 12 inside the connecting frame 11, the external movable seat 13 is driven to move within the connecting frame 11, so that the movement of the movable seat 13 drives the limiting block 14 at the lower front end to insert into the limiting groove inside the fixing block 4, thereby strengthening the connection between the injection tube 1 and the injection head body 6.

[0022] like Figure 3 , Figure 4 and Figure 5 As shown, four sets of sealing plates 16 are provided. The sealing plates 16 are rotatably connected to the injection head body 6 via the movable shaft 15. The upper end of the stainless steel spring 17 is fixedly connected to the inside of the injection head body 6. When the spiral blades inside the guide tube squeeze the melt into the injection tube 1 and the injection head body 6, the melt will generate a certain pressure to push the four sets of sealing plates 16 inside the injection head body 6, causing the four sets of sealing plates 16 to unfold, thereby squeezing the melt through the injection head body 6 into the mold. When the melt extrusion is lost, the four sets of sealing plates 16 are pushed back by the stainless steel spring 17 on the rear side to merge together, thereby preventing melt leakage.

[0023] like Figure 5 As shown, stainless steel seals 18 are inlaid on both outer sides of the sealing plate 16. Stainless steel seals 18 are inlaid on both sides of the four sets of sealing plates 16. When the sealing plate 16 is pushed by the stainless steel spring 17, the four sets of sealing plates 16 are combined together, so that the stainless steel seals 18 are pressed tightly against each other. Since there is no guide tube to push the melt, the sealing plates 16 will not be loose. Therefore, when the stainless steel seals 18 are pressed tightly against each other, leakage can be avoided.

[0024] The working principle of this product is as follows: First, align the external thread 7 on the rear side of the injection head body 6 with the internal thread 5 inside the injection tube 1 and tighten it. After tightening, rotate the connecting brackets 11 on the upper and lower sides of the injection head body 6 so that the movable seat 13 and the limiting block 14 inside the connecting bracket 11 are placed on the fixed block 4 outside the injection tube 1. Then, rotate the threaded rod 12 inside the connecting bracket 11 to drive the movable seat 13 and the limiting block 14 to insert into the limiting groove inside the fixed block 4, thereby strengthening the connection and sealing. Next, connect the threaded post 2 at the rear end of the injection tube 1 to one end of the guide tube. Then, when the spiral blades inside the guide tube compress the melt into the injection tube 1 and the injection head body... When the molten material is inside the injection head body 6, the molten material generates a certain pressure, pushing the four sets of sealing plates 16 inside the injection head body 6. This causes the four sets of sealing plates 16 to unfold and squeeze the stainless steel spring 17 on the rear side, forcing the molten material through the space between the four sets of sealing plates 16 and squeezing it into the mold for injection molding. When the molten material is stopped being delivered, the four sets of sealing plates 16 lose the pressure from the molten material. The four sets of sealing plates 16 rebound through the stainless steel spring 17 on the rear side, pushing the four sets of sealing plates 16 together. At the same time, the stainless steel seals 18 on both sides of the sealing plates 16 stick together tightly, thus preventing molten material leakage. This completes the process of using the leak-proof injection head.

[0025] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A leak-proof injection head, characterized in that: Includes an injection tube (1) for conveying the melt; The fixing block (4) is fixed on the upper and lower sides of the injection tube (1), and the injection tube (1) has an internal thread (5). The injection head body (6) is threaded to the front end of the injection tube (1). The rear end of the injection head body (6) is provided with an external thread (7). The rear side of the injection head body (6) is inlaid with a second sealing ring (8). The upper and lower sides of the injection head body (6) are fixedly connected with connecting blocks (9). The interior of the connecting blocks (9) is rotatably connected with a movable block (10). The upper part of the movable block (10) is fixedly connected with a connecting frame (11). The internal thread of the connecting frame (11) is threaded through a threaded rod (12). The external thread of the threaded rod (12) is connected with a movable seat (13). The lower part of the front end of the movable seat (13) is fixedly connected with a limit block (14). The movable shaft (15) is hinged to the inner wall of the injection head body (6). A sealing plate (16) is fixedly connected to the outside of the movable shaft (15), and a stainless steel spring (17) is fixedly connected to the rear side of the sealing plate (16).

2. The leak-proof injection head according to claim 1, characterized in that: The injection tube (1) is fixedly connected to a threaded post (2) at its rear end, and a first sealing ring (3) is embedded on the rear side of the injection tube (1).

3. The leak-proof injection head according to claim 1, characterized in that: The movable block (10) is rotatably connected to the injection head body (6), and the movable seat (13) is slidably connected to the connecting frame (11).

4. The leak-proof injection head according to claim 1, characterized in that: The limiting block (14) below the front end of the movable seat (13) is movably engaged with the fixing blocks (4) on the upper and lower sides of the injection tube (1). The fixing block (4) has a limiting groove inside that matches the limiting block (14).

5. A leak-proof injection head according to claim 1, characterized in that: The sealing plate (16) is provided in four sets. The sealing plate (16) is rotatably connected to the injection head body (6) through the movable shaft (15). The upper end of the stainless steel spring (17) is fixedly connected to the inside of the injection head body (6).

6. A leak-proof injection head according to claim 1, characterized in that: Stainless steel seals (18) are inlaid on both outer sides of the sealing plate (16).

Images