Anti-pulling structure of plastic mold sprue bushing

Abstract

The utility model relates to injection mold technical field, and disclose a kind of plastic mold gate bushing anti-wire drawing structure, including gate bushing body, the upper end of gate bushing body is drop-like, the center area of gate bushing body is formed with the tapering material delivery port, the upper end of gate bushing body is equipped with chamber, the inside of chamber is slidably connected with cutoff plate, and one end of cutoff plate is in contact with the inner wall of chamber.This kind of plastic mold gate bushing anti-wire drawing structure, through the slot hole set on cutoff plate, nozzle can pass through slot hole to the raw material in material delivery port, and the cutoff plate set can be after raw material delivery is completed, cutoff plate will raw material of material delivery port cut off, prevent the appearance of wire drawing phenomenon, not only effectively avoid the surface flaw of the forming piece caused by wire drawing, improve the appearance quality of product, and cutting action is rapid and accurate, can maximum degree reduce the waste of raw material in cutting process, reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a structure for preventing stringing of a plastic mold gate sleeve. Background Technology

[0002] Injection molds are specialized tools used in injection molding processes. They inject molten plastic material into a pre-set cavity under high temperature and pressure, and after cooling and solidification, form plastic products with specific shapes, sizes and surface qualities. Among them, the sprue bushing is a key component of the mold gating system, which undertakes the core function of guiding the molten plastic from the injection molding machine nozzle into the cavity accurately. Its structural design directly affects the filling efficiency of the plastic, the quality of the product and the service life of the mold.

[0003] An existing patent (publication number: CN220242266U) discloses a sprue sleeve anti-stringing structure for plastic molds, belonging to the field of injection mold technology. It includes a sprue sleeve body, with an injection channel carved at the bottom and an arc-shaped groove carved at the top, the injection channel and the arc-shaped groove being interconnected. An arc-shaped piece is provided on the upper side of the sprue sleeve body, corresponding to the arc-shaped groove. A cutting mechanism is provided between the arc-shaped piece and the sprue sleeve body to close the injection channel and prevent the waste material from stringing. The aim is to solve the problem in the prior art where, when the injection molding machine nozzle injects material into the plastic mold through the sprue sleeve, the solidified material inside the sprue sleeve generates waste material, which often exhibits stringing. This waste stringing easily affects the molding of the product inside the plastic mold, resulting in a large number of defective products.

[0004] When the above-mentioned device is in use, it can seal the injection channel through the cut-off structure to prevent the waste material in the flow channel from forming strings. However, in actual use, during the injection process, the nozzle presses against the arc-shaped plate, and the material outlet corresponds to the injection channel. The nozzle delivers raw material into the injection channel through the material outlet. When the nozzle delivers raw material, the raw material will also fill into the material outlet. After the nozzle separates from the arc-shaped plate, the cut-off plate will drive the material outlet to separate from the injection channel. The raw material remaining inside the material outlet can easily block the material outlet after cooling, thus affecting the subsequent injection work. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a plastic mold sprue sleeve anti-screwing structure, which has the advantages of preventing screwing and preventing material residue, thus solving the problems mentioned in the background technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a plastic mold sprue sleeve anti-stretching structure, comprising a sprue sleeve body, the upper end of the sprue sleeve body being teardrop-shaped, a conical material inlet forming in the central area of ​​the sprue sleeve body, a cavity being provided at the upper end of the sprue sleeve body, a cutting plate being slidably connected inside the cavity, one end of the cutting plate contacting the inner wall of the cavity, a slot being provided on the upper surface of the cutting plate, the slot corresponding to the position of the material inlet, a nozzle being provided between the slot and the material inlet, and the material inlet's material channel corresponding to the material inlet; An extrusion block is provided on the upper surface of one end of the cut-off plate. A groove is formed in the central area of ​​the upper surface of the extrusion block. A spring is fixedly connected to the central area of ​​the upper surface of the groove. The other end of the spring is fixedly connected to the inner top wall of the chamber. Each spring is in a compressed state. A discharge port is provided at the bottom of the sprue sleeve body. The discharge port corresponds to the position of the cut-off plate.

[0007] Furthermore, the inner wall of the slot is chamfered and fits the surface of the nozzle, and the bottom of the extrusion block is chamfered.

[0008] With the above scheme, the bottom end of the extrusion block is set with an arc chamfer, which allows the extrusion block to enter the slot under the push of the spring and fit with the inner wall of the slot. The extrusion block can push the solidified raw material inside the slot to be discharged through the discharge port.

[0009] Furthermore, a limiting rod is fixedly connected to the upper surface of the extrusion block, a spring is sleeved with the limiting rod, and the upper end of the limiting rod is slidably inserted into the inner top wall of the chamber.

[0010] The above scheme provides a limit rod to restrict the vertical sliding of the extrusion block, preventing the extrusion block from shifting during movement, so that the extrusion block can accurately enter the slot when the cutting plate is reset.

[0011] Furthermore, the upper surface of the sprue bushing body is provided with an irregularly shaped pressure plate, and an arc-shaped groove is opened on the upper surface of the irregularly shaped pressure plate. The nozzle contacts the inner wall of the arc-shaped groove. A contact member is fixedly connected to one side of the cut plate along its length direction. A triangular extrusion member is fixedly connected to the bottom end of the irregularly shaped pressure plate. The end of the contact member away from the cut plate contacts the inclined end of the extrusion member.

[0012] With the above scheme, the arc groove can be set so that when the nozzle approaches the feed port, the nozzle can push the irregular pressure plate to fit against the surface of the sprue sleeve body through the contact between the arc groove and the nozzle, so that the extruded part can contact the contacting part and push the cut plate to slide in the cavity, so that the slot on the cut plate corresponds to the feed port.

[0013] Furthermore, the upper surface of the sprue bushing body is provided with a matching groove corresponding to the position of the arc-shaped groove, and the bottom shape of the irregular pressure plate is adapted to the matching groove.

[0014] The above solution, by setting the fitting groove, can keep the irregularly shaped pressure plate stable after it enters the fitting groove, and prevent the irregularly shaped pressure plate from shaking or shifting during the injection molding process.

[0015] Furthermore, a set of springs is fixedly connected to one side of the cut-off plate, and the other end of each spring is fixedly connected to the inner wall of the chamber, and each spring is in a stretched state.

[0016] The above scheme enables the second spring to drive the cutting plate to reset through its deformation force, and to cut off the raw material at the feed port at one end of the cutting plate, thus preventing wire pulling.

[0017] Furthermore, the upper surface of the sprue sleeve body is provided with multiple allowance grooves distributed in a matrix. Multiple insert rods are fixedly connected to the bottom end of the irregularly shaped pressure plate. Each insert rod is slidably inserted into the adjacent allowance groove. Multiple return springs are fixedly connected to the bottom end of the irregularly shaped pressure plate. Each return spring is sleeved with the adjacent insert rod. The other end of each return spring is fixedly connected to the adjacent allowance groove.

[0018] The above scheme, which combines the insertion rod and the return spring, can limit the irregularly shaped pressure plate. The deformation force of the return spring can push the irregularly shaped pressure plate to return to its original position, facilitating the next delivery of injection molding material.

[0019] Compared with the prior art, the technical solution of this utility model has the following beneficial effects: This anti-stringing structure for plastic mold gate sleeves utilizes slots on a cutting plate. A nozzle can deliver raw material into the feed port through these slots. After material delivery, the cutting plate cuts off the material at the feed port, preventing stringing. This effectively avoids surface defects in the molded parts caused by stringing, improving product appearance quality. Furthermore, the cutting action is rapid and precise, minimizing material waste and reducing production costs. Additionally, after the cutting plate completely seals the feed port, any residual material in the slots is pushed out by the spring-loaded force from the extrusion block, preventing material residue from affecting subsequent material delivery. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the overall structure of this application; Figure 2 This is a bottom view of the irregularly shaped pressure plate structure of this application; Figure 3 This is a schematic diagram of the cut-off plate structure of this application; Figure 4 This is a top view of the irregularly shaped pressure plate structure of this application; Figure 5This is a top view of the main structure of the gating sleeve in this application; Figure 6 This is a schematic diagram of the overall structure of this application. Figure 1 ; Figure 7 This is a schematic diagram of the overall structure of this application. Figure 2 .

[0021] In the picture: 1. Sprue sleeve body; 2. Material inlet; 3. Chamber; 4. Cut-off plate; 5. Slot; 6. Nozzle; 7. Extrusion block; 8. Groove; 9. Spring 1; 10. Discharge port; 11. Limiting rod; 12. Irregularly shaped pressure plate; 13. Arc groove; 14. Contact element; 15. Extrusion element; 16. Fitting groove; 17. Spring 2; 18. Reserve groove; 19. Insert rod; 20. Return spring. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Please see Figure 1 , Figure 2 and Figure 3 This embodiment of a plastic mold sprue sleeve anti-stringing structure includes a sprue sleeve body 1, the upper end of which is teardrop-shaped. A conical material inlet 2 is formed in the central area of ​​the sprue sleeve body 1. A cavity 3 is formed at the upper end of the sprue sleeve body 1. A cutting plate 4 is slidably connected inside the cavity 3. One end of the cutting plate 4 contacts the inner wall of the cavity 3. The cutting plate 4 is used to cut off the plastic material after injection molding to prevent stringing, so that the molded part in the mold cavity can be smoothly separated from the sprue sleeve, ensuring the quality and appearance integrity of the molded part. A slot 5 is formed on the upper surface of the cutting plate 4. The slot 5 corresponds to the position of the material inlet 2. A nozzle 6 is provided between the slot 5 and the material inlet 2. The material delivery channel of the nozzle 6 corresponds to the material inlet 2. The nozzle 6 is used to accurately spray the plastic material into the material inlet 2 and into the mold cavity.

[0024] An extrusion block 7 is provided on the upper surface of one end of the cut-off plate 4. A groove 8 is formed in the central area of ​​the upper surface of the extrusion block 7. A spring 9 is fixedly connected to the central area of ​​the upper surface of the groove 8. The other end of the spring 9 is fixedly connected to the inner top wall of the chamber 3. Each spring 9 is in a compressed state. A discharge port 10 is provided at the bottom end of the sprue sleeve body 1. The discharge port 10 corresponds to the position of the cut-off plate 4. The spring 9 is provided so that after the cut-off plate 4 is reset, the extrusion block 7 enters the groove 5 under the deformation force of the spring 9, and applies pressure to the solidified material in the groove 8, so that the solidified material is discharged through the discharge port 10, preventing the material from adhering to the inner wall of the groove 5 and affecting the next injection molding operation. By resetting the cut-off plate 4, one end of the cut-off plate 4 can cut off the material at the feed port 2 to prevent stringing.

[0025] The inner wall of the slot 5 is chamfered and fits the surface of the nozzle 6. The fit between the slot 5 and the nozzle 6 prevents the material discharged from the nozzle 6 from flowing out through the gap between the slot 5 and the nozzle 6, thus improving the sealing between the nozzle 6 and the slot 5. The bottom end of the extrusion block 7 is chamfered and can enter the slot 5 under the push of the spring 9, fitting with the inner wall of the slot 8. The extrusion block 7 can push the solidified material inside the slot 5 to be discharged through the discharge port 10. The upper surface of the extrusion block 7 is fixedly connected to the limiting rod 11. The spring 9 is sleeved with the limiting rod 11. The upper end of the limiting rod 11 is slidably inserted into the inner top wall of the chamber 3. The limiting rod 11 can limit the vertical sliding of the extrusion block 7, preventing the extrusion block 7 from deviating during the movement, so that when the cutting plate 4 is reset, the extrusion block 7 can accurately enter the slot 5.

[0026] A shaped pressure plate 12 is provided on the upper surface of the sprue sleeve body 1. An arc groove 13 is formed on the upper surface of the shaped pressure plate 12. The nozzle 6 contacts the inner wall of the arc groove 13. A contact member 14 is fixedly connected to one side of the cut-off plate 4 along its length direction. A triangular extrusion member 15 is fixedly connected to the bottom end of the shaped pressure plate 12. The end of the contact member 14 facing away from the cut-off plate 4 contacts the inclined end of the extrusion member 15. The arc groove 13 is provided so that when the nozzle 6 approaches the feed port 2, the nozzle 6 can push the shaped pressure plate 12 through the contact between the arc groove 13 and the nozzle 6. The pressure plate 12 is in contact with the surface of the sprue bushing body 1, so that the extrusion part 15 can contact the contact part 14 and push the cut plate 4 to slide in the cavity 3, so that the slot 5 on the cut plate 4 corresponds to the material inlet 2. The upper surface of the sprue bushing body 1 is provided with a fitting groove 16 corresponding to the position of the arc groove 13. The bottom shape of the irregular pressure plate 12 is adapted to the fitting groove 16. The fitting groove 16 can make the irregular pressure plate 12 stable after entering the fitting groove 16, and prevent the irregular pressure plate 12 from shaking or shifting during the injection molding process.

[0027] A set of springs 17 is fixedly connected to one side of the cutting plate 4. The other end of each spring 17 is fixedly connected to the inner wall of the chamber 3. Each spring 17 is in a stretched state. The springs 17 are designed to drive the cutting plate 4 to reset through the deformation force of the springs 17, and cut off the raw material at the feed port 2 at one end of the cutting plate 4 to prevent wire pulling. The upper surface of the sprue sleeve body 1 has multiple allowance grooves 18 distributed in a matrix. The bottom end of the irregular pressure plate 12 is fixedly connected to multiple inserts. Each rod 19 is slidably inserted into an adjacent allowance slot 18. Multiple return springs 20 are fixedly connected to the bottom end of the irregularly shaped pressure plate 12. Each return spring 20 is sleeved with an adjacent rod 19, and the other end of each return spring 20 is fixedly connected to an adjacent allowance slot 18. The cooperation between the rods 19 and the return springs 20 can limit the irregularly shaped pressure plate 12. The deformation force of the return springs 20 can push the irregularly shaped pressure plate 12 to return to its original position, which facilitates the next delivery of injection molding material.

[0028] The working principle of the above embodiment is as follows: First, during injection molding, the nozzle 6 contacts the arc groove 13 on the shaped pressure plate 12, pushing the shaped pressure plate 12 to contact the sprue sleeve body 1, and compressing multiple return springs 20. At the same time, the extrusion piece 15 contacts the contact piece 14 and pushes the cut-off plate 4 to slide in the cavity 3, so that the slot 5 on the cut-off plate 4 corresponds to the material inlet 2. At this time, the second spring 17 is compressed, the cut-off plate 4 pushes out the extrusion block 7, and compresses the first spring 9. When the slot 5 corresponds to the material inlet 2, the nozzle 6 can contact the slot 5, conveying the raw material through the material inlet 2 to the external mold. Inside the mold cavity, after the material is fed, the nozzle 6 separates from the slot 5. At this time, the deformation force of the return spring 20 can pull the cut-off plate 4 to reset, so that one end of the cut-off plate 4 closes the feed port 2 and cuts off the fed material to prevent the wire pulling phenomenon. When the cut-off plate 4 resets, when the material remains in the slot 5, the material in the slot 5 will gradually cool down as the cut-off plate 4 moves. When the cut-off plate 4 is completely reset, the slot 8 can correspond to the discharge port 10. The deformation force of the spring 9 will push the extrusion block 7 into the slot 8, push out the solidified material in the slot 5, and discharge the remaining material through the discharge port 10.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A plastic mold sprue bushing anti-drawing structure, comprising a sprue bushing body (1), characterized in that: The upper end of the sprue sleeve body (1) is teardrop-shaped, and a cone-shaped material inlet (2) is formed in the central area of ​​the sprue sleeve body (1). A cavity (3) is opened at the upper end of the sprue sleeve body (1). A cutting plate (4) is slidably connected inside the cavity (3). One end of the cutting plate (4) is in contact with the inner wall of the cavity (3). A slot (5) is opened on the upper surface of the cutting plate (4). The slot (5) corresponds to the position of the material inlet (2). A nozzle (6) is provided between the slot (5) and the material inlet (2). The material conveying channel of the nozzle (6) corresponds to the material inlet (2). An extrusion block (7) is provided on the upper surface of one end of the cut-off plate (4). A groove (8) is formed in the central area of ​​the upper surface of the extrusion block (7). A spring (9) is fixedly connected to the central area of ​​the upper surface of the groove (8). The other end of the spring (9) is fixedly connected to the inner top wall of the chamber (3). Each spring (9) is in a compressed state. A discharge port (10) is opened at the bottom of the sprue sleeve body (1). The discharge port (10) corresponds to the position of the cut-off plate (4).

2. The anti-drawing structure of a plastic mold sprue bushing according to claim 1, characterized in that: The inner wall of the slot (5) is chamfered and fits the surface of the nozzle (6), and the bottom of the extrusion block (7) is chamfered.

3. The anti-drawing structure of the plastic mold sprue bushing according to claim 1, characterized in that: The upper surface of the extrusion block (7) is fixedly connected to a limiting rod (11), and a spring (9) is sleeved with the limiting rod (11). The upper end of the limiting rod (11) is slidably inserted into the inner top wall of the chamber (3).

4. The anti-drawing structure of the plastic mold sprue bushing according to claim 1, characterized in that: The upper surface of the sprue sleeve body (1) is provided with a shaped pressure plate (12), and an arc groove (13) is opened on the upper surface of the shaped pressure plate (12). The nozzle (6) contacts the inner wall of the arc groove (13). A contact member (14) is fixedly connected to one side of the cut plate (4) along its length direction. A triangular extrusion member (15) is fixedly connected to the bottom end of the shaped pressure plate (12). The end of the contact member (14) away from the cut plate (4) contacts the inclined end of the extrusion member (15).

5. The anti-drawing structure of a plastic mold sprue bushing according to claim 1, characterized in that: The upper surface of the sprue sleeve body (1) is provided with a matching groove (16) corresponding to the position of the arc groove (13), and the bottom shape of the irregular pressure plate (12) is adapted to the matching groove (16).

6. The anti-drawing structure of a plastic mold sprue bushing according to claim 1, characterized in that: A set of springs (17) is fixedly connected to one side of the cut-off plate (4). The other end of each spring (17) is fixedly connected to the inner wall of the chamber (3). Each spring (17) is in a stretched state.

7. The anti-drawing structure of a plastic mold sprue bushing according to claim 1, characterized in that: The upper surface of the gate sleeve body (1) is provided with multiple allowance grooves (18) arranged in a matrix. Multiple insert rods (19) are fixedly connected to the bottom end of the irregular pressure plate (12). Each insert rod (19) is slidably inserted into the adjacent allowance groove (18). Multiple return springs (20) are fixedly connected to the bottom end of the irregular pressure plate (12). Each return spring (20) is sleeved with the adjacent insert rod (19). The other end of each return spring (20) is fixedly connected to the adjacent allowance groove (18).

Images