A bubble-proof plastic mold

Abstract

This utility model relates to the field of plastic mold technology, specifically an anti-bubble plastic mold, including an upper mold, a lower mold mounted at the bottom of the upper mold, a fixing plate mounted at the top of the upper mold, a feed port in the middle of the fixing plate, a transition frame mounted inside the upper mold via an installation structure, an installation frame fixedly connected to the side wall of the transition frame, a locking block slidably connected inside the installation frame, a locking groove inside the upper mold, the locking block engaging with the locking groove, an anti-foaming structure and an venting structure mounted inside the installation frame, a casting cavity between the upper and lower molds, and a discharge port of the transition frame communicating with the casting cavity. By integrating the venting and anti-foaming structures within the transition frame, and enabling quick installation and removal of the transition frame in the upper mold via the installation structure, not only are the maintenance of the venting and anti-foaming structures convenient, but they can also be installed in molds for producing different plastic parts, thereby improving versatility and reducing production costs.

Description

Technical Field

[0001] This utility model relates to a plastic mold, specifically an anti-bubble plastic mold, and belongs to the field of plastic mold technology. Background Technology

[0002] Plastic molds are a type of combined mold used for compression molding, extrusion molding, injection molding, blow molding, and low-foaming molding. The coordinated changes of the mold's punch, die, and auxiliary molding system can produce a series of plastic parts of different shapes and sizes. During operation, liquid plastic is injected into the injection cavity through the injection port. After a period of time, the injection part is formed in the injection cavity. The upper mold is then opened, and the worker can remove the injection part. To prevent air from being trapped in the liquid plastic during injection, or to prevent gas from being generated by the evaporation of raw materials, or to prevent gas from being trapped due to the mold cavity being closed, which could lead to defects such as bubbles, pinholes, and depressions inside or on the surface of the injection part, anti-bubble plastic molds have emerged. By optimizing the venting and defoaming structure design, effective control of gas is achieved, ensuring the quality of the molded plastic parts.

[0003] However, in traditional anti-bubble plastic molds, components such as venting structures (e.g., vent pipes) and defoaming structures (e.g., bubble-piercing needles, defoaming rollers) are often fixedly integrated with the mold body. That is, these functional components are directly machined or installed in the mold cavity and runner according to the shape and process requirements of the specific plastic part. This direct connection with the mold makes it difficult to maintain the functional components. When the functional components wear out or malfunction, the entire mold must be disassembled for repair. This is not only time-consuming and labor-intensive, but also easily affects the precision of the mold body. Furthermore, it has poor versatility. When changing the mold for production of a new plastic part, the entire functional components must be replaced, resulting in high production costs. Utility Model Content

[0004] The purpose of this utility model is to provide an anti-bubble plastic mold to solve the above problems. By integrating the venting structure and the defoaming structure into the transition frame, and the transition frame can be quickly installed and disassembled in the upper mold through the installation structure, the venting structure and the defoaming structure are not only convenient to maintain, but can also be installed in molds for the production of different plastic parts, thereby improving the versatility of the venting structure and the defoaming structure and reducing production costs.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: an anti-bubble plastic mold, including an upper mold, a lower mold installed at the bottom of the upper mold, a fixing plate installed at the top of the upper mold, a feed port in the middle of the fixing plate, a transition frame installed inside the upper mold through an installation structure, the installation structure including an installation frame, the side wall of the transition frame being fixedly connected to the installation frame, a locking block being slidably connected inside the installation frame, a locking groove being opened inside the upper mold, the locking block engaging with the locking groove, an anti-bubble structure and an air venting structure being installed inside the installation frame, a casting cavity being provided between the upper mold and the lower mold, and the discharge port of the transition frame communicating with the casting cavity.

[0006] Preferably, the bottom end of the transition frame has a funnel-shaped structure, the bottom end of the transition frame is inserted into the upper mold, and a rubber pad is installed at the top end of the transition frame, the rubber pad abutting against the fixing plate.

[0007] Preferably, a guide rod is fixedly connected inside the mounting frame, the locking block is slidably connected to the guide rod, and a spring is sleeved on the outside of the guide rod, with both ends of the spring fixedly connected to the mounting frame and the locking block, respectively.

[0008] Preferably, a positioning rod is fixedly connected to the transition frame, and the defoaming structure includes a filter screen, which is inserted into the positioning rod.

[0009] Preferably, three defoaming rollers are rotatably connected to the transition frame, and multiple sets of bubble-piercing needles are linearly arrayed on the defoaming rollers.

[0010] Preferably, a motor is installed on the side wall of the transition frame, and the motor is fixedly connected to a defoaming roller located in the middle of the transition frame. Each of the three defoaming rollers has a pulley fixedly connected to its end facing away from the motor, and the same belt is wound around two adjacent pulleys.

[0011] Preferably, the exhaust structure includes an exhaust groove, the upper mold has multiple exhaust grooves, the transition frame has two sets of exhaust pipes, the exhaust pipes are fitted with a sealing ring in the shape of a frustum, the sealing ring abuts against the upper mold, and the exhaust pipes have multiple exhaust holes arranged in a circular array at one end inside the transition frame.

[0012] Preferably, the two exhaust pipes in the same group are provided with a mounting plate at one end outside the transition frame, and two exhaust fans are mounted on the mounting plate, the exhaust fans being located at the ends of the exhaust pipes.

[0013] Preferably, a knob is rotatably connected to the mounting plate, and the knob is threadedly connected to the transition frame.

[0014] The beneficial effects of this utility model are as follows: A transition frame is installed inside the upper mold via an installation structure. An installation frame is fixedly connected to the side wall of the transition frame. A locking block is slidably connected inside the installation frame. A locking groove is provided inside the upper mold, and the locking block engages with the locking groove. An anti-foaming structure and an venting structure are installed inside the installation frame. By integrating the venting and anti-foaming structures within the transition frame, and by enabling rapid installation and removal of the transition frame in the upper mold via the installation structure, not only is the maintenance of the venting and anti-foaming structures convenient, but they can also be installed in molds for producing different plastic parts, thereby improving the versatility of the venting and anti-foaming structures and reducing production costs. Attached Figure Description

[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 connection structure between the upper mold and the mounting frame of this utility model; Figure 3 This is a schematic diagram of the connection structure between the mounting frame and the filter screen of this utility model; Figure 4 This is a schematic diagram of the connection structure between the mounting frame and the defoaming roller of this utility model; Figure 5 for Figure 4 The diagram shown is an enlarged view of the structure of part A. Figure 6 This is a schematic diagram of the connection structure between the upper and lower molds of this utility model.

[0016] In the diagram: 1. Upper mold; 2. Lower mold; 3. Fixing plate; 4. Transition frame; 5. Feed inlet; 6. Mounting structure; 601. Mounting frame; 602. Locking block; 603. Locking groove; 604. Guide rod; 605. Spring; 606. Positioning rod; 7. Defoaming structure; 701. Filter screen; 702. Defoaming roller; 703. Bubble-piercing needle; 704. Motor; 705. Pulley; 706. Belt; 8. Exhaust structure; 801. Exhaust groove; 802. Exhaust pipe; 803. Sealing ring; 804. Exhaust hole; 805. Mounting plate; 806. Exhaust fan; 807. Knob; 9. Casting cavity; 10. Rubber pad. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-6As shown, an anti-bubble plastic mold includes an upper mold 1, a lower mold 2 installed at the bottom of the upper mold 1, a fixing plate 3 installed at the top of the upper mold 1, a feed port 5 in the middle of the fixing plate 3, a transition frame 4 installed inside the upper mold 1 via an installation structure 6, the installation structure 6 including an installation frame 601, the side wall of the transition frame 4 being fixedly connected to the installation frame 601, a locking block 602 slidably connected inside the installation frame 601, a locking groove 603 opened inside the upper mold 1, the locking block 602 engaging with the locking groove 603, an anti-foaming structure 7 and an venting structure 8 installed inside the installation frame 601, a casting cavity 9 between the upper mold 1 and the lower mold 2, the discharge port of the transition frame 4 communicating with the casting cavity 9, the bottom end of the transition frame 4 having a funnel-shaped structure, and the bottom end of the transition frame 4 being inserted into the upper mold 1.

[0019] As a technical optimization of this utility model, a guide rod 604 is fixedly connected inside the mounting frame 601, and the locking block 602 is slidably connected to the guide rod 604. A spring 605 is sleeved on the outside of the guide rod 604, and the two ends of the spring 605 are fixedly connected to the mounting frame 601 and the locking block 602 respectively. The guide rod 604 has a good guiding effect on the locking block 602, making the sliding of the locking block 602 more stable.

[0020] As a technical optimization of this utility model, a rubber pad 10 is installed at the top of the transition frame 4. The rubber pad 10 abuts against the fixing plate 3. The rubber pad 10 at the top of the transition frame 4 abuts against the fixing plate 3, which can enhance the sealing of the joint between the two, prevent liquid plastic from overflowing from the gap, and at the same time buffer the vibration during the operation of the mold, and avoid wear between the transition frame 4 and the fixing plate 3 due to rigid contact.

[0021] As a technical optimization of this utility model, a positioning rod 606 is fixedly connected to the transition frame 4, and the defoaming structure 7 includes a filter screen 701. The filter screen 701 is inserted into the positioning rod 606. The filter screen 701 filters and initially defoams the liquid plastic entering the transition frame 4. Three defoaming rollers 702 are rotatably connected to the transition frame 4. Multiple sets of bubble-piercing needles 703 are linearly arrayed on the defoaming rollers 702. The defoaming rollers 702 and bubble-piercing needles 703 then perform a secondary defoaming operation on the liquid plastic, thereby further breaking down the tiny bubbles that have not been completely eliminated in the plastic and reducing... To reduce the probability of air bubbles entering the casting cavity 9 and improve the density and surface quality of the molded plastic part, a motor 704 is installed on the side wall of the transition frame 4. The motor 704 is fixedly connected to a defoaming roller 702 located in the middle of the transition frame 4. Each of the three defoaming rollers 702 has a pulley 705 fixedly connected to one end facing away from the motor 704. The same belt 706 is wound around two adjacent pulleys 705. The motor 704, pulleys 705 and belt 706 provide power to the defoaming rollers 702 and achieve synchronous rotation, ensuring that the bubble-piercing needle 703 pierces the air bubbles in the plastic evenly and efficiently.

[0022] As a technical optimization of this utility model, the exhaust structure 8 includes an exhaust groove 801. Multiple exhaust grooves 801 are provided on the upper mold 1. Two sets of exhaust pipes 802 are installed on the transition frame 4. A frustum-shaped sealing ring 803 is fitted around the exhaust pipe 802, and the sealing ring 803 abuts against the upper mold 1. Multiple exhaust holes 804 are arranged in a circular array at one end of the exhaust pipe 802 located inside the transition frame 4. The exhaust pipe 802 collects gas from inside the transition frame 4 through the exhaust holes 804. The frustum-shaped sealing ring 803 ensures the exhaust channel is sealed, allowing for efficient gas discharge. The gas is then discharged to the mold through the exhaust grooves 801. On the outside of the device, the two exhaust pipes 802 in the same group are provided with a mounting plate 805 at one end outside the transition frame 4. Two exhaust fans 806 are mounted on the mounting plate 805. The exhaust fans 806 are located at the end of the exhaust pipes 802. The exhaust fans 806 can accelerate the discharge of gas in the pipes and improve exhaust efficiency. A knob 807 is rotatably connected to the mounting plate 805. The knob 807 is threadedly connected to the transition frame 4. When the end of the exhaust pipe 802 is blocked and needs to be cleaned, the knob 807 can be loosened to remove the mounting plate 805, thereby pulling the exhaust pipe 802 out of the transition frame 4 for cleaning, and facilitating the maintenance of the exhaust fans 806.

[0023] In use, this utility model first fixes the transition frame 4 inside the upper mold 1 via the mounting structure 6. During operation, the bottom end of the transition frame 4 is aligned with the flow channel opening on the upper mold 1, and then the transition frame 4 is inserted downwards into the upper mold 1. The rubber sleeve outside the tube at the bottom end of the transition frame 4 abuts against the inner wall of the flow channel of the upper mold 1, enhancing the sealing and preventing the gas discharged from the venting structure 8 from entering the casting cavity 9. During the downward insertion of the transition frame 4, when the locking block 602 abuts against the upper mold 1, the inclined structure at the bottom of the locking block 602 has a guiding effect, causing the upper mold 1 to slide into the mounting frame 601 against the locking block 602. At the same time, the locking block 602 abuts against the spring 605 and retracts. When the transition frame 4 slides... Once in place, the locking block 602 aligns with the slot 603 on the upper mold 1. At this time, the spring 605 resets and drives the locking block 602 to engage in the slot 603, thereby quickly positioning the transition frame 4 and preventing it from moving. This increases the stability of the transition frame 4 installation and allows for quick installation and removal, making subsequent maintenance and replacement more convenient and flexible. Furthermore, the defoaming structure 7 and the venting structure 8 can be detachably installed in molds of different plastic parts or in new molds, improving their versatility and reducing production costs. Then, the fixing plate 3 is bolted to the top of the upper mold 1. At this time, the rubber pad 10 at the top of the transition frame 4 is engaged with the fixing plate 1. The plate 3 abuts against the transition frame 4, thereby improving the sealing performance and preventing leakage of the injected liquid plastic. Then, the liquid plastic is injected into the transition frame 4 through the inlet 5 on the fixed plate 3. The filter screen 701 filters impurities (coke, particles) in the liquid plastic and initially breaks the air bubbles, achieving initial defoaming. Then, the control switch of the motor 704 is activated, driving the defoaming roller 702 in the middle of the transition frame 4 to rotate. Through the pulley 705 and belt 706, the other two defoaming rollers 702 rotate synchronously. The bubble-piercing needles 703 on the defoaming rollers 702 break the remaining air bubbles, thus achieving secondary defoaming. Simultaneously, the exhaust structure 8 starts working, and the transition frame... The gas dispersed inside the mold 4 enters the pipe through the vent hole 804 on the vent pipe 802. The exhaust fan 806 is activated to accelerate the gas discharge. The discharged gas is discharged to the outside of the mold through the vent groove 801 on the upper mold 1. This allows the gas in the liquid plastic to be discharged before entering the casting cavity 9. As a result, the mold venting no longer relies solely on the mold parting surface and the ejector pin gap. This achieves active and centralized gas discharge, greatly improving venting efficiency and effectively reducing bubble defects in the plastic part. The plastic that has undergone defoaming and venting treatment enters the casting cavity 9 through the funnel-shaped outlet at the bottom of the transition frame 4. After the plastic is formed in the cavity, the upper mold 1 and the lower mold 2 are opened to remove the formed plastic part.

[0024] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bubble-proof plastic mold, comprising an upper mold (1), characterized in that: The lower mold (2) is installed at the bottom of the upper mold (1), and a fixing plate (3) is installed at the top of the upper mold (1). A feed port (5) is opened in the middle of the fixing plate (3). A transition frame (4) is installed in the upper mold (1) through an installation structure (6). The installation structure (6) includes an installation frame (601). The side wall of the transition frame (4) is fixedly connected to the installation frame (601). A locking block (602) is slidably connected in the installation frame (601). A slot (603) is opened in the upper mold (1). The locking block (602) engages with the slot (603). A defoaming structure (7) and an exhaust structure (8) are installed in the installation frame (601). A casting cavity (9) is provided between the upper mold (1) and the lower mold (2). The discharge port of the transition frame (4) is connected to the casting cavity (9).

2. The anti-bubble plastic mold according to claim 1, characterized in that: The bottom of the transition frame (4) is funnel-shaped. The bottom of the transition frame (4) is inserted into the upper mold (1). A rubber pad (10) is installed on the top of the transition frame (4). The rubber pad (10) abuts against the fixing plate (3).

3. The anti-bubble plastic mold according to claim 1, characterized in that: A guide rod (604) is fixedly connected inside the mounting frame (601). The locking block (602) is slidably connected to the guide rod (604). A spring (605) is sleeved on the outside of the guide rod (604). The two ends of the spring (605) are fixedly connected to the mounting frame (601) and the locking block (602) respectively.

4. The bubble-proof plastic mold according to claim 2, characterized in that: A positioning rod (606) is fixedly connected to the transition frame (4), and the defoaming structure (7) includes a filter screen (701), which is inserted into the positioning rod (606).

5. The anti-bubble plastic mold according to claim 4, characterized in that: Three defoaming rollers (702) are rotatably connected to the transition frame (4), and multiple sets of bubble-piercing needles (703) are linearly arrayed on the defoaming rollers (702).

6. The bubble-proof plastic mold according to claim 5, characterized in that: A motor (704) is installed on the side wall of the transition frame (4). The motor (704) is fixedly connected to a defoaming roller (702) located in the middle of the transition frame (4). Each of the three defoaming rollers (702) is fixedly connected to a pulley (705) at the end facing away from the motor (704). The same belt (706) is wound around two adjacent pulleys (705).

7. The anti-bubble plastic mold according to claim 1, characterized in that: The exhaust structure (8) includes an exhaust groove (801). The upper mold (1) has multiple exhaust grooves (801). The transition frame (4) is equipped with two sets of exhaust pipes (802). The exhaust pipes (802) are fitted with a sealing ring (803) in the shape of a frustum. The sealing ring (803) abuts against the upper mold (1). The exhaust pipes (802) located inside the transition frame (4) have multiple exhaust holes (804) arranged in a circular array at one end.

8. The bubble-proof plastic mold according to claim 7, characterized in that: The two exhaust pipes (802) in the same group are provided with a mounting plate (805) at one end outside the transition frame (4). Two exhaust fans (806) are installed on the mounting plate (805), and the exhaust fans (806) are located at the end of the exhaust pipes (802).

9. A bubble-proof plastic mold according to claim 8, characterized in that: A knob (807) is rotatably connected to the mounting plate (805), and the knob (807) is threadedly connected to the transition frame (4).

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