Multi-cavity hot runner injection mold based on plastic waste regeneration
By introducing extrusion components and a magnet system into the mold, the problem of extended molding cycle caused by reduced injection speed in the prior art is solved, realizing high-speed injection and fully automated production to meet different batch requirements.
Patent Information
- Application Number
- CN202512051601.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-03-13
AI Technical Summary
Existing multi-cavity hot runner injection molds for recycling plastic waste require reduced injection speeds to prevent gas retention, which leads to longer molding cycle times.
By introducing extrusion components and a magnet system into the mold, the hot air generated during injection is used to compress the airbag, which drives the magnet to slide and lock the mold frame, enabling high-speed injection and automated production, ensuring smooth injection of molten raw materials and rapid venting.
It achieves effective venting under high-speed injection, shortens the molding cycle, realizes fully automated production, and can quickly adjust the number of production cavities according to order requirements to adapt to different batch production.
Smart Images
Figure CN121650190A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of injection mold technology, specifically to a multi-cavity hot runner injection mold based on the recycling of plastic waste. Background Technology
[0002] Multi-cavity hot runner injection molds for recycling plastic waste are advanced molding systems designed for efficient and high-quality processing of recycled plastics. Through a multi-cavity layout, they enable the injection molding of multiple products in a single operation, significantly improving efficiency. Their specially optimized hot runners can precisely control temperature and reduce shear to adapt to the volatility of recycled materials and reduce degradation.
[0003] Existing multi-cavity hot runner injection molds for recycling plastic waste first melt the pre-treated recycled plastic granules. The melt is kept in a molten state by the hot runner system and evenly distributed to each cavity through equal resistance channels. However, the injection speed needs to be reduced during mold production to prevent gas retention, which leads to an extended molding cycle time. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides a multi-cavity hot runner injection mold based on recycled plastic waste, which solves the problem that existing multi-cavity hot runner injection molds based on recycled plastic waste require reduced injection speed during mold production, resulting in extended molding cycle time.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-cavity hot runner injection mold based on recycled plastic waste, comprising a first protective shell, a mold frame slidably connected inside the first protective shell, a first elastic element provided at the bottom end of the mold frame, the bottom end of the first elastic element being located inside the first protective shell, a baffle slidably connected inside the first protective shell, an injection port provided inside the first protective shell and the baffle, a heat dissipation channel provided inside the first protective shell and the baffle, a first conveying channel provided inside the first protective shell and the heat dissipation channel, a sliding plate slidably connected inside the first protective shell, one end of the sliding plate being fixedly connected to the outside of the mold frame, the outside of the sliding plate being located inside the heat dissipation channel, and an extrusion assembly provided inside the first protective shell, one end of the extrusion assembly being located inside the mold frame.
[0006] The above solution involves injection ports being provided at corresponding positions on the first protective shell and the baffle. When the baffle slides to the predetermined position, a complete injection feeding channel is formed, ensuring that the molten material can be smoothly injected into the mold.
[0007] Preferably, the extrusion assembly includes an air bladder, the outer part of which is disposed inside the first protective shell. A second conveying channel is fixedly connected to the bottom end of the air bladder, a first magnet is disposed at one end of the second conveying channel, the top end of the air bladder is disposed at one end of the first conveying channel, a second magnet is disposed at one end of the first magnet, a sliding rod is fixedly connected to one end of the second magnet, and a locking block is fixedly connected to one end of the sliding rod.
[0008] Preferably, the first magnetic magnet, the second magnetic magnet, the sliding rod, and the locking block are externally slidably connected inside the first protective housing, the second conveyor is externally fixedly connected inside the first protective housing, and one end of the locking block is disposed inside the mold frame.
[0009] Preferably, a locking component is provided inside the first protective housing, and the top of the locking component is located inside the baffle.
[0010] Preferably, the locking assembly includes a sliding frame, the outside of which is slidably connected to the inside of the first protective housing, a third magnet is fixedly connected to the inside of the sliding frame, a second elastic element is provided at one end of the sliding frame, one end of the second elastic element is located inside the first protective housing, and a connecting rod is slidably connected to the inside of the sliding frame.
[0011] Preferably, the outer side of the third magnet is slidably connected to the inside of the first protective housing, and the outer side of the connecting rod is slidably connected to the inside of the first protective housing and the baffle.
[0012] Preferably, a second protective shell is provided outside the first protective shell, and a hand latch is provided inside the baffle.
[0013] Preferably, the first protective shell has a splicing component inside, and the splicing component is disposed inside the second protective shell.
[0014] Preferably, the splicing assembly includes a locking rod, the locking rod being slidably connected to the outside of the first protective housing, a third elastic element being provided at one end of the locking rod, one end of the third elastic element being located inside the first protective housing, and a push block being fixedly connected to the outside of the locking rod.
[0015] Preferably, one end of the locking rod is disposed inside the second protective housing, and the outside of the pushing block is slidably connected to the inside of the first protective housing.
[0016] Working principle: The hot air generated during the injection molding process enters the heat dissipation channel, and then compresses the airbag through the first conveyor channel, locking the mold frame after it has descended. When the injection molding is completed and the hot air is exhausted, the first magnet will move to its original position through the airbag, causing the sliding frame to slide. The sliding frame will then drive the connecting rod to slide, unlocking the baffle. Pulling the handle will then cause the baffle to slide, allowing the molded item to be removed.
[0017] This invention provides a multi-cavity hot runner injection mold based on recycled plastic waste. It has the following advantages: 1. This invention allows hot air generated during injection molding to enter the heat dissipation channel and the first conveying channel. The hot air compresses the air bladder, which in turn drives the first magnetic magnet to slide. At the same time, the second magnetic magnet drives the sliding rod and the locking block to slide, and inserts the locking block into the mold frame. This enables high-speed production, allows for effective venting under high-speed injection, shortens the molding cycle, and allows each cavity to operate independently, ensuring that the venting state of each cavity is consistent.
[0018] 2. This invention moves the first magnet back to its original position, causing the sliding frame to slide. The connecting rod slides in the inclined groove inside the sliding frame, thereby achieving the effect of opening the baffle after the injection molding is completed and the gas is vented. The baffle opens automatically and is linked with the robot arm to pick up the part, realizing fully automated production, shortening the cycle time and reducing manual intervention.
[0019] 3. In this invention, the second protective shell is inserted into the first protective shell, and the locking rod is driven by the third elastic element to enter the second protective shell, thereby achieving the effect of quick splicing of the cavity. The number of production cavities can be quickly adjusted according to order requirements to adapt to different batch production. The switching speed is much faster than changing the entire set of molds. Attached Figure Description
[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial structural diagram of the first protective shell of the present invention; Figure 3 This is a partial structural diagram of the mold frame of the present invention; Figure 4 This is a partial structural diagram of the baffle of the present invention; Figure 5 This is a partial structural diagram of the airbag of the present invention; Figure 6 This is a partial structural diagram of the second conveyor channel of the present invention; Figure 7 This is a partial structural diagram of the sliding rod of the present invention; Figure 8 This is a partial structural diagram of the sliding frame of the present invention; Figure 9 This is a partial structural diagram of the driving block of the present invention.
[0021] The components include: 1. First protective shell; 2. Injection port; 3. Mold frame; 4. First elastic element; 5. Baffle; 6. Heat dissipation channel; 7. Sliding plate; 8. First conveying channel; 9. Extrusion assembly; 91. Airbag; 92. Second conveying channel; 93. First magnet; 94. Second magnet; 95. Sliding rod; 96. Locking block; 10. Locking assembly; 101. Sliding frame; 102. Third magnet; 103. Second elastic element; 104. Connecting rod; 11. Second protective shell; 12. Splicing assembly; 121. Locking rod; 122. Third elastic element; 123. Push block; 13. Hand buckle. Detailed Implementation
[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] Please see the appendix Figure 1 -Appendix Figure 3 This invention provides a multi-cavity hot runner injection mold based on recycled plastic waste, including a first protective shell 1, a mold frame 3 slidably connected inside the first protective shell 1, a first elastic element 4 provided at the bottom end of the mold frame 3, the bottom end of the first elastic element 4 being located inside the first protective shell 1, a baffle 5 slidably connected inside the first protective shell 1, an injection port 2 opened inside the first protective shell 1 and the baffle 5, a heat dissipation channel 6 opened inside the first protective shell 1 and the heat dissipation channel 6, a first conveying channel 8 opened inside the first protective shell 1, a sliding plate 7 slidably connected inside the first protective shell 1, one end of the sliding plate 7 being fixedly connected to the outside of the mold frame 3, the outside of the sliding plate 7 being located inside the heat dissipation channel 6, and an extrusion assembly 9 being provided inside the first protective shell 1, one end of the extrusion assembly 9 being located inside the mold frame 3; Specifically, the first protective shell 1 is connected to the baffle 5 with an injection port 2, which is connected to the discharge port to prevent plastic liquid from splashing out. The first protective shell 1 is used to support and fix the first elastic member 4, which is made of spring. The first protective shell 1 assists the mold frame 3 in sliding. At the same time, the mold frame 3 can drive the first elastic member 4 to compress. When the internal item is taken out, the first elastic member 4 can drive the mold frame 3 back to its original position. The first protective shell 1 and the baffle 5 are provided with heat dissipation channels 6. The heat dissipation channels 6 can prevent the leakage of hot air through the sliding plate 7. The sliding plate 7 is rigidly connected to the mold frame 3. When the mold frame 3 slides, the sliding plate 7 slides synchronously. At the same time, the first protective shell 1 and the heat dissipation channels 6 are provided with a first conveying channel 8. The first conveying channel 8 inside the heat dissipation channel 6 has a funnel, and the funnel can allow most of the hot air to enter the first conveying channel 8.
[0024] Please see the appendix Figure 4 -Appendix Figure 6 The extrusion assembly 9 includes an airbag 91. The airbag 91 is externally disposed inside the first protective shell 1. The bottom end of the airbag 91 is fixedly connected to a second conveying channel 92. One end of the second conveying channel 92 is provided with a first magnet 93. The top end of the airbag 91 is disposed at one end of the first conveying channel 8. One end of the first magnet 93 is provided with a second magnet 94. One end of the second magnet 94 is fixedly connected to a sliding rod 95. One end of the sliding rod 95 is fixedly connected to a locking block 96. The first magnet 93, the second magnet 94, the sliding rod 95, and the locking block 96 are externally slidably connected inside the first protective shell 1. The second conveying channel 92 is externally fixedly connected inside the first protective shell 1. One end of the locking block 96 is disposed inside the mold frame 3. Specifically, the first protective shell 1 is used to support the airbag 91 and to support the second conveying channel 92 for fixation. When the airbag 91 is compressed by hot air, the second conveying channel 92 can transport the air inside the airbag 91 to the space storing the first magnet 93 and drive the first magnet 93 to slide. At the same time, the first magnet 93 will drive the second magnet 94 to slide with the sliding rod 95 and the locking block 96. The locking block 96 will be inserted into the mold frame 3. The sliding rod 95 is composed of a support rod and a spring. When the second magnet 94 loses its repulsive force, the spring will drive the sliding rod 95 to move to its original position.
[0025] Please see the appendix Figure 6 -Appendix Figure 8The first protective shell 1 is provided with a locking component 10 inside. The top of the locking component 10 is located inside the baffle 5. The locking component 10 includes a sliding frame 101. The outside of the sliding frame 101 is slidably connected to the inside of the first protective shell 1. A third magnet 102 is fixedly connected inside the sliding frame 101. A second elastic member 103 is provided at one end of the sliding frame 101. One end of the second elastic member 103 is located inside the first protective shell 1. A connecting rod 104 is slidably connected inside the sliding frame 101. The outside of the third magnet 102 is slidably connected to the inside of the first protective shell 1. The outside of the connecting rod 104 is slidably connected to the inside of the first protective shell 1 and the baffle 5. Specifically, the sliding frame 101 is used to support and fix the third magnet 102. The third magnet 102 will generate a repulsive force with the first magnet 93, causing the sliding frame 101 and the third magnet 102 to slide. The third magnet 102 has an angle inside. When the third magnet 102 slides, the connecting rod 104 will slide inside the sliding frame 101. At the same time, the connecting rod 104 will slide from inside the baffle 5 into the first protective shell 1, causing the baffle 5 to lose its locking force. Then, the second elastic element 103 will be compressed during the sliding of the sliding frame 101. When the third magnet 102 loses its repulsive force, the second elastic element 103 will drive the sliding frame 101 and the third magnet 102 to slide back to their original positions. The connecting rod 104 will re-enter the baffle 5 and lock the baffle 5. Since there is an angle between the baffle 5 and the first protective shell 1, and with the help of the robot to pick up the parts, fully automated production is achieved. The robot is existing technology and will not be described here.
[0026] Please see the appendix Figure 1 -Appendix Figure 3 The first protective shell 1 is provided with a second protective shell 11 on the outside, and the baffle 5 is provided with a hand buckle 13 inside; Specifically, the first protective shell 1 can be connected to multiple second protective shells 11, and the number of production chambers can be quickly adjusted according to order requirements. The baffle 5 has a handle 13 inside, which can improve the sliding of the baffle 5 and also achieve the functions of convenience and stability.
[0027] Please see the appendix Figure 7 -Appendix Figure 9The first protective shell 1 has a splicing component 12 inside, and the splicing component 12 is disposed inside the second protective shell 11. The splicing component 12 includes a locking rod 121, which is slidably connected to the inside of the first protective shell 1. One end of the locking rod 121 is provided with a third elastic element 122, which is disposed inside the first protective shell 1. A pushing block 123 is fixedly connected to the outside of the locking rod 121, which is disposed inside the second protective shell 11. The outside of the pushing block 123 is slidably connected to the inside of the first protective shell 1. Specifically, the first protective housing 1 is used to support the sliding of the locking rod 121 and the pushing block 123, and the first protective housing 1 is used to support the compression of the third elastic member 122. When the third elastic member 122 is squeezed by the locking rod 121, it is compressed. When the locking rod 121 loses its squeezing force, the third elastic member 122 will drive the locking rod 121 and the pushing block 123 back to their original positions. At the same time, the locking rod 121 can lock the connection between the first protective housing 1 and the second protective housing 11.
[0028] Workflow: First, the injection port 2 is connected to the discharge port, and liquid plastic enters the mold frame 3. When the amount of liquid plastic reaches the predetermined value, it will drive the first elastic element 4 to compress and drive the sliding plate 7 to slide downward, so that the first protective shell 1 and the heat dissipation channel 6 opened inside the baffle 5 can be connected. At the same time, when the amount of liquid plastic inside the mold frame 3 has not reached the predetermined value, the hot air will be stored in the heat dissipation channel 6 opened inside the baffle 5, and the hot air will squeeze the air bag 91 through the first conveying channel 8. During the compression process, the gas inside the air bag 91 will be transported to the space storing the first magnet 93 through the second conveying channel 92. Then the first magnet 93 will move forward and will repel the second magnet 94, the sliding rod 95, and the locking block 96 to move forward, and insert the locking block 96 into the interior of the mold frame 3 after the descent is completed. This can achieve the effect of high-speed production, allowing effective venting under high-speed injection, shortening the molding cycle, and each cavity can operate independently, so that the venting state of each cavity is consistent. Then, when the hot air inside the mold frame 3 is completely discharged, the airbag 91 will return the gas that was in contact with the second conveyor 92 and the first magnet 93 to the airbag 91, and drive the first magnet 93 to move back to its original position. At the same time, the sliding rod 95 will return to its original position through its own spring, and the first magnet 93 will slide the sliding frame 101 and the third magnet 102 under the action of repulsive force, and drive the second elastic element 103 to be compressed. The connecting rod 104 will slide inside the sliding frame 101, and then slide downward. The connecting rod 104 will move from inside the baffle 5 to inside the first protective shell 1, and then the baffle 5 and the sliding groove of the first protective shell 1 will have an angle. When the baffle 5 loses its locking force, it will move downward and cooperate with the robot arm, so that the baffle 5 can be opened after the injection molding is completed and the gas is discharged. The baffle 5 opens automatically and is linked with the robot arm to pick up the part, realizing fully automated production, shortening the cycle time and reducing manual intervention. When assembling according to actual conditions, the first protective shell 1 is first connected to the second protective shell 11. Since the second protective shell 11 is inserted into the first protective shell 1, it can prevent the second protective shell 11 from sliding due to front or rear pushing force. At the same time, during the descent, the second protective shell 11 will squeeze the locking rod 121 and drive the third elastic element 122 to compress. The locking rod 121 will drive the pushing block 123 to slide. When the second protective shell 11 reaches the predetermined position, the third elastic element 122 will drive the locking rod 121 and the pushing block 123 back to the original position through its own characteristics. The locking rod 121 will be inserted into the second protective shell 11, so that there is a locking force between the first protective shell 1 and the second protective shell 11. This can achieve the effect of quick splicing of cavity positions. The number of production cavities can be quickly adjusted according to order requirements to adapt to different batch production. The switching speed is much faster than changing the entire set of molds.
[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A multi-cavity hot runner injection mold based on recycled plastic waste, comprising a first protective shell (1), characterized in that, The first protective shell (1) is slidably connected to a mold frame (3). The bottom end of the mold frame (3) is provided with a first elastic element (4). The bottom end of the first elastic element (4) is located inside the first protective shell (1). The first protective shell (1) is slidably connected to a baffle (5). The first protective shell (1) and the baffle (5) are provided with an injection port (2). The first protective shell (1) and the baffle (5) are provided with a heat dissipation channel (6). The first protective shell (1) and the heat dissipation channel (6) are provided with a first conveying channel (8). The first protective shell (1) is slidably connected to a sliding plate (7). One end of the sliding plate (7) is fixedly connected to the outside of the mold frame (3). The outside of the sliding plate (7) is located inside the heat dissipation channel (6). The first protective shell (1) is provided with an extrusion assembly (9). One end of the extrusion assembly (9) is located inside the mold frame (3).
2. The multi-cavity hot runner injection mold based on recycled plastic waste according to claim 1, characterized in that, The extrusion assembly (9) includes an airbag (91), the outside of which is disposed inside the first protective shell (1). The bottom end of the airbag (91) is fixedly connected to a second conveying channel (92). One end of the second conveying channel (92) is provided with a first magnet (93). The top end of the airbag (91) is disposed at one end of the first conveying channel (8). One end of the first magnet (93) is provided with a second magnet (94). One end of the second magnet (94) is fixedly connected to a sliding rod (95). One end of the sliding rod (95) is fixedly connected to a locking block (96).
3. A multi-cavity hot runner injection mold based on recycled plastic waste according to claim 2, characterized in that, The first magnet (93) and the second magnet (94), the sliding rod (95) and the locking block (96) are externally slidably connected inside the first protective shell (1), the second conveyor (92) is externally fixedly connected inside the first protective shell (1), and one end of the locking block (96) is set inside the mold frame (3).
4. A multi-cavity hot runner injection mold based on recycled plastic waste according to claim 1, characterized in that, The first protective shell (1) is provided with a locking component (10) inside, and the top of the locking component (10) is provided inside the baffle (5).
5. A multi-cavity hot runner injection mold based on recycled plastic waste according to claim 4, characterized in that, The locking assembly (10) includes a sliding frame (101), which is externally slidably connected to the inside of the first protective shell (1). A third magnet (102) is fixedly connected inside the sliding frame (101). A second elastic element (103) is provided at one end of the sliding frame (101), and one end of the second elastic element (103) is located inside the first protective shell (1). A connecting rod (104) is slidably connected inside the sliding frame (101).
6. A multi-cavity hot runner injection mold based on recycled plastic waste according to claim 5, characterized in that, The third magnet (102) is externally slidably connected to the inside of the first protective shell (1), and the connecting rod (104) is externally slidably connected to the inside of the first protective shell (1) and the baffle (5).
7. A multi-cavity hot runner injection mold based on recycled plastic waste according to claim 1, characterized in that, The first protective shell (1) is provided with a second protective shell (11) on the outside, and the baffle (5) is provided with a hand buckle (13) inside.
8. A multi-cavity hot runner injection mold based on recycled plastic waste according to claim 1, characterized in that, The first protective shell (1) is provided with a splicing component (12) inside, and the splicing component (12) is provided with an exterior inside the second protective shell (11).
9. A multi-cavity hot runner injection mold based on recycled plastic waste according to claim 8, characterized in that, The splicing assembly (12) includes a locking rod (121), the locking rod (121) is externally slidably connected to the inside of the first protective shell (1), one end of the locking rod (121) is provided with a third elastic element (122), one end of the third elastic element (122) is provided inside the first protective shell (1), and a push block (123) is fixedly connected to the outside of the locking rod (121).
10. A multi-cavity hot runner injection mold based on recycled plastic waste according to claim 9, characterized in that, One end of the locking rod (121) is located inside the second protective housing (11), and the outside of the push block (123) is slidably connected to the inside of the first protective housing (1).