A reshaping mold for recycling plastic products

Abstract

The application relates to the technical field of injection molds and discloses a remolding type plastic product forming cyclic recycling mold, which comprises an injection mold group, the injection mold group comprises a fixed mold plate, a supporting plate is installed on the left side of the fixed mold plate, a movable mold plate is slidably installed on the right side of the fixed mold plate through guide columns, female mold cores are symmetrically embedded on the front and back of the right end of the fixed mold plate, and male mold cores are symmetrically embedded on the front and back of the left end of the movable mold plate. The remolding type plastic product forming cyclic recycling mold can effectively solve the problems in the prior art, that is, the corner materials in the injection mold usually need to be cooled, manually or mechanically stripped, collected, transported to a crushing workshop and the like, the process is complicated, the time consumption is relatively long, and the corner materials can introduce dust and impurities in the transportation and stacking processes, so that the purity of the regenerated materials is reduced; meanwhile, the mold lacks an effective blocking structure for the nipple runner, and the solidified runner material in the runner system is prone to adhesion with the residual molten material in the nipple which has not been completely cooled.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and more specifically to a recyclable mold for molding plastic products. Background Technology

[0002] Plastic injection molding, as an important process for efficient and mass production of products, is widely used in daily necessities, electronics, automotive parts, and other fields. During the injection molding process, in addition to forming the target plastic product, the mold inevitably produces sprue material, flash (excess material) around the product's perimeter, and a small amount of defective products and trimming material generated from demolding or subsequent processes; these are collectively referred to as injection molding scrap. To achieve resource conservation and cost control, current methods typically involve crushing and granulating clean scrap, mixing it with virgin material in a certain proportion, and then re-injecting it into the injection molding machine for molding, thus forming a closed-loop recycling system for materials.

[0003] In response to this, this application designs a recyclable mold for reshaping plastic products. Existing injection mold designs mainly focus on the molding quality and production efficiency of the final product. Scrap materials (especially solidified sprue material) usually require multiple offline processes such as cooling, manual or mechanical peeling, centralized collection, and transfer to the crushing workshop. This process is not only cumbersome and time-consuming, but also introduces dust and impurities during transfer and accumulation, leading to a decrease in the purity of recycled materials and directly affecting the purity and pass rate of subsequent injection molded products. Secondly, because existing injection molds lack an effective barrier structure for the sprue runner, the solidified sprue material in the sprue system easily adheres to the residual molten material in the sprue during mold opening. This not only makes it difficult to remove the sprue material, but also requires additional cleaning of the sprue runner, increasing the time and labor consumption of the process. In severe cases, it can also cause runner blockage, affecting the continuous operation of the injection mold. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a recyclable mold for molding plastic products. This effectively solves the problem that in existing technologies, scrap materials from injection molds typically require multiple offline processes, including cooling, manual or mechanical stripping, centralized collection, and transfer to a crushing workshop. This process is not only cumbersome and time-consuming, but also introduces dust and impurities during transfer and accumulation, leading to a decrease in the purity of the recycled material. Furthermore, the lack of an effective barrier structure for the sprue runner means that during mold opening, the solidified sprue material in the gating system easily adheres to the incompletely cooled residual molten material in the sprue. This not only makes it difficult to remove the sprue material but also requires additional cleaning of the sprue runner, increasing the time and effort required for the process. In severe cases, it can even cause runner blockage, affecting the continuous operation of the injection mold.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a recyclable mold for molding reusable plastic products, comprising:

[0007] The injection mold assembly includes a fixed mold plate, a support plate installed on the left side of the fixed mold plate, and a movable mold plate slidably installed on the right side of the fixed mold plate via guide pillars. The female mold core is symmetrically embedded at the front and back of the right end of the fixed mold plate, and the male mold core is symmetrically embedded at the front and back of the left end of the movable mold plate. The fixed mold plate, the support plate, and the movable mold plate are all provided with a sprue heat cut-off part. The movable mold plate and the second sealing plate are all provided with a sprue separation part for separating the sprue material.

[0008] Among them, the right end of the sealing plate is connected to a material cylinder, and the right side of the outer wall of the material cylinder is connected to a hopper;

[0009] The hot-cut section includes a main sprue located in the middle of the right end of the fixed template. The main sprue has symmetrical gates on the inner walls at both ends. The main sprue has symmetrical butt holes on the inner wall at the left end, which are connected to the main sprue. The right end of the support plate has a sealing cavity corresponding to the two butt holes. The fixed template and the support plate are equipped with a negative pressure adsorption group. The right end of the male mold core has a receiving groove. The moving template and the male mold core are equipped with a hot-cutting group.

[0010] Furthermore, a sealing plate is installed on the left end of the support plate through two mold feet, and a sealing plate is installed on the right end of the moving mold plate. A nozzle is installed through the middle of the sealing plate and the moving mold plate. An ejector base plate is installed on the right end of the sealing plate. An ejector panel is slidably installed on the right end of the ejector base plate through a guide post. Several ejector pins for ejecting plastic products and sprue material are installed on the right end of the ejector panel. Ejector pin holes are opened on the fixed mold plate and the support plate corresponding to several ejector pins.

[0011] Furthermore, the runner separation section includes an insertion hole on the left side of the outer wall of the nozzle, the insertion hole being connected to the flow channel of the nozzle, a venting cavity connected to the insertion hole being provided at the upper end of the moving template, a sealing base plate with a central vent hole being installed on the upper side of the inner wall of the venting cavity, and a vent nozzle connected to the vent hole on the sealing base plate being installed at the upper end of the moving template, and a separation assembly being provided on both the moving template and the nozzle.

[0012] Furthermore, the negative pressure adsorption assembly includes an air outlet plate installed on the right side of the inner wall of the connecting hole. The air outlet plate has a U-shaped structure. A sealing plate is slidably installed on the left side of the air outlet plate on the inner wall of the connecting hole. The sealing plate consists of a large rectangular block and a small rectangular block. The outer wall of the small rectangular block is movably attached to the inner wall of the cavity of the air outlet plate. An installation base is slidably installed on the inner wall of the sealing cavity through a tension spring. The right end of the installation base is fixedly connected to the sealing plate through a connecting rod.

[0013] Furthermore, the negative pressure adsorption assembly also includes an air passage one located at the upper end of the fixed template corresponding to the air outlet plate. The lower end of the air passage is connected to the corresponding connecting hole, and the lower end of the air passage one is located on the left side of the air outlet plate. An air passage two is provided at the upper end of the support plate corresponding to the mounting base. The lower end of the air passage two is connected to the corresponding sealing cavity, and the lower end of the air passage two is located on the left side of the mounting base. An air nozzle one connected to the air passage one is installed at the upper end of the fixed template, and an air nozzle one connected to the air passage two is also installed at the upper end of the support plate.

[0014] Furthermore, the hot-cutting assembly includes a receiving hole located at the left end of the male mold core corresponding to the gate. The receiving hole is connected to the corresponding receiving groove. A sealing plug with an air hole in the middle is installed on the right side of the inner wall of the receiving groove. The left end of the sealing plug is connected to a mounting post through a tension spring. The outer wall of the mounting post is slidably connected to the inner wall of the corresponding receiving groove. A die-cutting blade is installed at the left end of the mounting post and slidably connected to the inner wall of the receiving hole. An air passage three is opened at the upper end of the moving template corresponding to the male mold core. The lower end of the air passage three is connected to the air hole of the corresponding sealing plug. An air nozzle two is installed at the upper end of the moving template and connected to the air passage three.

[0015] Furthermore, the separation assembly includes a partition plate that is slidably installed on the lower side of the inner wall of the ventilation cavity. The partition plate consists of a rectangular slide bar and a semi-waist-shaped blocking plate. Both ends of the semi-waist-shaped blocking plate on the partition plate are wedge-shaped structures. The semi-waist-shaped blocking plate of the partition plate is slidably connected to the inner wall of the insertion hole. The left end of the nozzle has an installation groove that communicates with the insertion hole. The installation groove has an arc-shaped design. Fixing plates are installed on the left and right sides of the inner wall of the installation groove. The end of the fixing plate facing the insertion hole is connected to a magnetic suction slide plate by a compression spring. The magnetic suction slide plate is slidably connected to the inner wall of the installation groove, and the upper side of the opposite ends of the two magnetic suction slide plates is a wedge-shaped structure.

[0016] Furthermore, a receiving plate is installed on the lower right side of the fixed template, and a storage groove is opened on the left side of the moving template corresponding to the receiving plate.

[0017] The technical solution provided by this invention has the following advantages compared with the prior art:

[0018] This invention provides a recyclable mold for molding remodeling plastic products. During the injection molding feeding stage, after the cavity and gating system are filled with molten plastic, compressed air is introduced into the air nozzle tee connected to the air hole of the sealing substrate. The partition plate slides along the inner wall of the venting cavity away from the sealing substrate until the semi-waist-shaped blocking plate on the partition plate is inserted into the insertion hole and tightly adheres to the inner wall of the nozzle's runner. This achieves the effect of separating and blocking the molten plastic in the nozzle runner through the partition plate, avoiding the problem of solidified gating material in the gating system easily adhering to the incompletely cooled residual molten material in the nozzle during the mold opening process due to the lack of an effective blocking structure for the nozzle runner in traditional injection molds. This not only makes it difficult to remove the gating material but also requires additional cleaning of the nozzle runner, increasing the process time. In severe cases, it can even cause runner blockage, affecting the continuous cycle operation of the injection mold.

[0019] During the hot cutting stage at the sprue, compressed air is first introduced into the air nozzle 2 connected to the air passage 3. The mounting column will drive the die-cutting blade to slide to the left along the inner wall of the receiving hole, thereby achieving the effect of accurately cutting and separating the solidified plastic product from the sprue material. This avoids the problem that in conventional injection molds, scrap materials (especially solidified sprue material) usually need to go through multiple offline processes such as cooling, manual or mechanical peeling, centralized collection, and transfer to the crushing workshop. Not only is the process cumbersome and time-consuming, but during the transfer and stacking process, scrap materials will also introduce dust and impurities, resulting in a decrease in the purity of recycled materials, which directly affects the purity and pass rate of subsequent injection molded products. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the three-dimensional separation of the template and the receiving plate in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a partial three-dimensional cross-section of the template and support plate in an embodiment of the present invention;

[0024] Figure 4 For the present invention Figure 3 A magnified structural diagram of section X in the middle;

[0025] Figure 5This is a schematic diagram of the three-dimensional separation of the template and the support plate in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the three-dimensional separation of the air outlet plate and the sealing plate in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of a partial three-dimensional cross-section of the moving template in an embodiment of the present invention;

[0028] Figure 8 For the present invention Figure 7 A magnified structural diagram of the area at point Y in the middle;

[0029] Figure 9 This is a schematic diagram of the three-dimensional separation of the male mold core and the hot-cutting assembly in an embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of a partial three-dimensional cross-section of the moving template, sealing plate 2, and nozzle in an embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the three-dimensional separation of the nozzle and the separator in an embodiment of the present invention.

[0032] The labels in the diagram represent: 1. Injection mold assembly; 11. Fixed mold plate; 111. Female mold core; 112. Receiving plate; 12. Support plate; 13. Sealing plate one; 14. Moving mold plate; 141. Male mold core; 15. Sealing plate two; 151. Sprue; 16. Mold foot; 17. Ejector base plate; 18. Ejector face plate; 181. Ejector hole; 2. Sprue barrel; 3. Hopper; 4. Hot-cut gate section; 41. Main runner; 42. Gate; 43. Butt through hole; 44. Sealing cavity; 45. Negative pressure adsorption assembly; 451. Vent plate; 452. Sealing plate. 453. Blocking plate; 454. Connecting rod; 455. Mounting base; 456. Air passage 1; 457. Air passage 2; 458. Air nozzle 1; 46. Receiving groove; 47. Hot cutting assembly; 471. Storage hole; 472. Sealing plug; 473. Mounting post; 474. Die-cutting blade; 475. Air passage 3; 476. Air nozzle 2; 5. Sprue separation section; 51. Insertion hole; 52. Vent chamber; 53. Sealing base plate; 54. Air nozzle 3; 55. Separation assembly; 551. Partition plate; 552. Mounting groove; 553. Fixing plate; 554. Magnetic sliding plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] The present invention will be further described below with reference to embodiments.

[0035] Example:

[0036] Please see Figures 1-11 This invention provides a technical solution: a recyclable mold for molding and reusing reusable plastic products, comprising:

[0037] Injection mold 1 includes a fixed mold plate 11, a support plate 12 installed on the left side of the fixed mold plate 11, and a movable mold plate 14 slidably installed on the right side of the fixed mold plate 11 via a guide post. The right end of the fixed mold plate 11 is symmetrically fitted with a female mold core 111, and the left end of the movable mold plate 14 is symmetrically fitted with a male mold core 141. The fixed mold plate 11, the support plate 12, and the movable mold plate 14 are all provided with a sprue heat-cutting part 4. The movable mold plate 14 and the sealing plate 15 are all provided with a sprue separation part 5 for separating and blocking the sprue material.

[0038] Among them, the right end of the sealing plate 15 is connected to the material cylinder 2, and the right side of the outer wall of the material cylinder 2 is connected to the hopper 3;

[0039] The hot-cut section 4 includes a main gating system 41 located in the middle of the right end of the fixed template 11. The main gating system 41 has symmetrical gates 42 on the inner walls of its front and rear ends. The main gating system 41 has symmetrical connecting holes 43 on the inner wall of its left end. The connecting holes 43 are connected to the main gating system 41. The right end of the support plate 12 has a sealing cavity 44 corresponding to the two connecting holes 43. The fixed template 11 and the support plate 12 are jointly provided with a negative pressure adsorption group 45. The male mold core 141 has a receiving groove 46 on its right end. The moving template 14 and the male mold core 141 are jointly provided with a hot-cutting group 47.

[0040] A sealing plate 13 is installed on the left end of the support plate 12 through two mold feet 16. A sealing plate 15 is installed on the right end of the moving mold plate 14. A nozzle 151 is installed through the middle of the sealing plate 15 and the moving mold plate 14. An ejector base plate 17 is installed on the right end of the sealing plate 13. An ejector panel 18 is slidably installed on the right end of the ejector base plate 17 through a guide post. Several ejector pins for ejecting plastic products and sprue material are installed on the right end of the ejector panel 18. Ejector pin holes 181 are opened on the fixed mold plate 11 and the support plate 12 corresponding to several ejector pins.

[0041] The runner separation section 5 includes an insertion hole 51 located on the left side of the outer wall of the nozzle 151. The insertion hole 51 is connected to the flow channel of the nozzle 151. A venting cavity 52 connected to the insertion hole 51 is provided at the upper end of the moving template 14. A sealing substrate 53 with a vent hole in the middle is installed on the upper side of the inner wall of the venting cavity 52. ​​A three-way air nozzle 54 connected to the vent hole on the sealing substrate 53 is installed at the upper end of the moving template 14. A separation assembly 55 is provided on both the moving template 14 and the nozzle 151.

[0042] The negative pressure adsorption assembly 45 includes an air outlet plate 451 installed on the right side of the inner wall of the connecting through hole 43. The air outlet plate 451 has a U-shaped structure. A sealing plate 452 is slidably installed on the left side of the air outlet plate 451 on the inner wall of the connecting through hole 43. The sealing plate 452 is composed of a large rectangular block and a small rectangular block. The outer wall of the small rectangular block is movably attached to the inner wall of the cavity of the air outlet plate 451. An installation base 454 is slidably installed on the inner wall of the sealing cavity 44 through a tension spring. The right end of the installation base 454 is fixedly connected to the sealing plate 452 through a connecting rod 453.

[0043] The negative pressure adsorption group 45 also includes an air passage 455 located on the upper end of the fixed template 11 corresponding to the air outlet plate 451. The lower end of the air passage 455 is connected to the corresponding connecting through hole 43, and the lower end of the air passage 455 is located on the left side of the air outlet plate 451. An air passage 456 is provided on the upper end of the support plate 12 corresponding to the mounting base 454. The lower end of the air passage 456 is connected to the corresponding sealing cavity 44, and the lower end of the air passage 456 is located on the left side of the mounting base 454. An air nozzle 457 connected to the air passage 455 is installed on the upper end of the fixed template 11, and an air nozzle 457 connected to the air passage 456 is also installed on the upper end of the support plate 12.

[0044] The hot-cutting assembly 47 includes a receiving hole 471 located at the left end of the male mold core 141 corresponding to the gate 42. The receiving hole 471 is connected to the corresponding receiving groove 46. A sealing plug 472 with an air hole in the middle is installed on the right side of the inner wall of the receiving groove 46. The left end of the sealing plug 472 is connected to the mounting post 473 by a tension spring. The outer wall of the mounting post 473 is slidably connected to the inner wall of the corresponding receiving groove 46. A die-cutting blade 474 is installed at the left end of the mounting post 473 and slidably connected to the inner wall of the receiving hole 471. An air passage 3 475 is opened at the upper end of the moving template 14 corresponding to the male mold core 141. The lower end of the air passage 3 475 is connected to the air hole of the corresponding sealing plug 472. An air nozzle 2 476 connected to the air passage 3 475 is installed at the upper end of the moving template 14.

[0045] The separation assembly 55 includes a partition plate 551 that is slidably installed on the lower side of the inner wall of the ventilation cavity 52. ​​The partition plate 551 is composed of a rectangular slide bar and a semi-waist-shaped blocking plate. Both ends of the semi-waist-shaped blocking plate on the partition plate 551 are wedge-shaped structures. The semi-waist-shaped blocking plate of the partition plate 551 is slidably connected to the inner wall of the insertion hole 51. The left end of the nozzle 151 is provided with an installation groove 552 that communicates with the insertion hole 51. The installation groove 552 is arc-shaped. Fixing plates 553 are installed on the left and right sides of the inner wall of the installation groove 552 respectively. The end of the fixing plate 553 facing the insertion hole 51 is connected to a magnetic suction slide plate 554 by a compression spring. The magnetic suction slide plate 554 is slidably connected to the inner wall of the installation groove 552, and the upper side of the opposite ends of the two magnetic suction slide plates 554 are wedge-shaped structures.

[0046] A receiving plate 112 is installed on the lower right side of the fixed template 11, and a storage groove is opened on the left side of the moving template 14 corresponding to the receiving plate 112.

[0047] In practice:

[0048] First, the hot-cutting section 4 of this application is used to cut and separate the plastic product and the runner material. The runner separation section 5 is used to separate the runner material blocking the flow channel of the nozzle 151. The air nozzle 457 connected to the second air passage 456 is used to deliver compressed air. By injecting or extracting compressed air, the mounting base 454 can be controlled to drive the sealing plate 452 to slide back and forth along the inner wall of the sealing cavity 44. The air nozzle 457 connected to the first air passage 455 is used to cooperate with an external vacuum pump to extract air from the connecting hole 43, thereby achieving… The control system allows the cavity inside the through hole 43 to freely switch between two states: normal pressure release and negative pressure adsorption. The second air nozzle 476 connected to the third air passage 475 is used to deliver compressed air. By injecting or extracting compressed air, the mounting column 473 can be controlled to drive the die-cutting blade 474 to slide back and forth along the inner wall of the receiving groove 46. The third air nozzle 54 connected to the air hole of the sealing substrate 53 is used to deliver compressed air. By injecting or extracting compressed air, the partition plate 551 can be controlled to slide back and forth along the inner wall of the ventilation cavity 52.

[0049] During the mold closing preparation stage, firstly, under the control of the drive mechanism in the injection molding system, the moving platen 14 will slide along the guide post towards the side closer to the fixed platen 11 until the female mold core 111 on the fixed platen 11 and the male mold core 141 on the moving platen 14 are precisely fitted together, completing the closure of the mold cavity. At the same time, the ejector plate 18 is in the initial retracted state, and several ejector pins on the ejector plate 18 are initially housed in the corresponding ejector pin holes 181 to avoid interfering with subsequent injection molding work.

[0050] The initial reset adjustment is performed through the air circuit control system. The specific operation steps are as follows: First, compressed air is introduced into the air nozzle 457 of the air passage 2 456. The compressed air pushes the mounting base 454 to slide to the right along the inner wall of the sealing cavity 44. The tension spring on the mounting base 454 will be stretched. At this time, the mounting base 454 will drive the sealing plate 452 to slide to the right synchronously through the connecting rod 453 until the small rectangular block on the sealing plate 452 is smoothly inserted into the cavity on the air outlet plate 451, and the right end of the small rectangular block on the sealing plate 452 is flush with the right end of the air outlet plate 451. Thus, by blocking the air outlet plate 451, the connecting hole 43 is sealed, avoiding the problem of backflow into the connecting hole 43 after the subsequent molten plastic is injected, which would cause leakage.

[0051] It should be noted that, in the initial state, the second air nozzle 476 connected to the air passage 3 475 is not supplied with compressed air. Under the action of the tension spring, the mounting post 473 will be located on the side closer to the sealing plug 472. At this time, the die-cutting blade 474 will be stored in the corresponding storage hole 471 to avoid interference with the mold core 111. Similarly, the third air nozzle 54 connected to the air hole of the sealing base plate 53 is not supplied with compressed air. Under the action of the tension spring, the partition plate 551 will be located on the side closer to the sealing base plate 53. At this time, the semi-waist-shaped blocking plate on the partition plate 551 is not embedded in the insertion hole 51 and does not temporarily block the flow channel of the nozzle 151. The flow channel of the nozzle 151 is in a conductive state, and the two magnetic suction slides 554 on the left and right are close to each other and magnetically connected. The two magnetic suction slides 554 on the left and right can block the flow channel of the nozzle 151 to prevent the subsequent molten plastic from flowing back into the insertion hole 51 and the ventilation cavity 52, causing blockage or damage.

[0052] During the injection molding feeding stage, as the plastic raw material in the hopper 3 enters the barrel 2, the plastic raw material will be heated and melted by the barrel 2. The molten plastic will be pushed by the extrusion screw inside the barrel 2 to be injected into the main runner 41 along the flow channel of the nozzle 151. Under pressure, the molten plastic will flow along the main runner 41 to the front and rear ends, and enter the cavity formed by the corresponding female mold core 111 and male mold core 141 through the front and rear gates 42 respectively, until the cavity and the gating system (main runner 41 and gate 42) are filled with molten plastic.

[0053] After the cavity and gating system are filled with molten plastic, compressed air needs to be introduced into the air nozzle 3 54 connected to the air hole of the sealing base plate 53. At this time, under the pressure of the compressed air, the partition plate 551 will slide along the inner wall of the venting cavity 52 away from the sealing base plate 53 until the semi-waist-shaped blocking plate on the partition plate 551 is inserted into the insertion hole 51 and tightly fits against the inner wall of the runner of the nozzle 151. This achieves the effect of separating and blocking the molten plastic in the runner of the nozzle 151 through the partition plate 551, avoiding the situation where, due to the lack of an effective blocking structure for the runner of the nozzle 151, the solidified gating material in the gating system is easily stuck to the residual molten material in the nozzle 151 during the mold opening process. This not only makes it difficult to remove the gating material, but also requires additional cleaning of the runner of the nozzle 151, increasing the process time. In severe cases, it can also cause runner blockage, affecting the effect of continuous cycle operation of the injection mold.

[0054] It should be noted that during the process of the partition plate 551 moving away from the sealing substrate 53, the partition plate 551 will simultaneously squeeze the two magnetic sliding plates 554 on the left and right sides, causing them to release the magnetic connection and move away from each other to avoid each other. When the semi-waist-shaped plug on the partition plate 551 is inserted into the socket 51 and tightly adheres to the inner wall of the flow channel of the nozzle 151, the two magnetic sliding plates 554 on the left and right sides will be tightly adhered to the side wall of the partition plate 551 under the action of the compression spring.

[0055] During the cooling and solidification stage, once the semi-waist-shaped plug plate on the partition plate 551 is inserted into the insertion hole 51 and tightly adheres to the inner wall of the runner of the nozzle 151, the built-in cooling system of the injection mold 1 (not shown in the figure, this is a conventional injection mold cooling structure) can be activated to cool the fixed mold plate 11, moving mold plate 14, female mold core 111, and male mold core 141, causing the molten plastic inside the cavity to gradually solidify and form the target plastic product. At the same time, the molten plastic in the gating system solidifies synchronously to form the gating material. It should be noted that since the molten plastic in the runner of the nozzle 151 is divided into left and right sides, the molten plastic on the left side will pass through the cooling system. The molten plastic on the right side is cooled by the cooling system, but it is not cooled by the cooling system. Instead, it is kept warm by an additional insulation structure to prevent over-cooling from affecting subsequent injection operations. At the same time, the partition plate 551 divides the molten material in the flow channel of the nozzle 151 into two parts, with only the molten plastic on the side closest to the cavity participating in cooling and shaping. The molten plastic on the right side of the nozzle 151 can be kept in a molten state by the insulation structure. In the next injection operation, there is no need to completely reheat the raw material in the barrel 2, which shortens the plastic melting preheating time, reduces equipment energy consumption, and improves the injection feeding response speed.

[0056] It should also be noted that, before the cooling is almost complete, the pre-adsorption preparation of the negative pressure adsorption group 45 can be started in advance: first, stop the supply of compressed air to the air nozzle 457 of the connecting air passage 2 456. At this time, under the reset action of the tension spring, the mounting base 454 will drive the sealing plate 452 to slide to the left through the connecting rod 453 until the small rectangular block on the sealing plate 452 exits and moves away from the cavity of the air outlet plate 451, thereby achieving the effect of releasing the seal on the connecting hole 43. Then, control the external vacuum pump to start working. The external vacuum pump will draw air from the connecting hole 43 through the air nozzle 457 of the connecting air passage 1 455. The air inside the hole 43 creates a negative pressure environment within the connecting hole 43. At this time, the two air outlet plates 451 will work together to tightly adsorb the sprue material in the main sprue 41. The negative pressure adsorption group 45 adsorbs and fixes the sprue material in the main sprue 41 in advance before the hot cutting operation, so that the position of the sprue material is kept stable and avoids the sprue material shifting due to force during the hot cutting process, which would cause cutting deviation. This not only ensures that the cut surface of the gate 42 is flat, but the adsorption force can also counteract the cutting impact force of the die-cutting blade 474, prevent the molded plastic product from deforming due to vibration, and further improve the integrity of the plastic product.

[0057] During the hot-cutting stage of the sprue, after cooling and solidification, compressed air is first introduced into the air nozzle 476 connected to the air passage 3 475. Under the pressure of the compressed air, the mounting post 473 will drive the die-cutting blade 474 to slide to the left along the inner wall of the receiving hole 471. During this process, both the front and rear die-cutting blades 474 will precisely act on the corresponding gate 42, thereby achieving the effect of precisely cutting and separating the solidified plastic product from the sprue material. This avoids the need for conventional injection molds to cool and process scraps (especially solidified sprue material) during operation. The process involves multiple offline steps, such as manual or mechanical stripping, centralized collection, and transfer to the crushing workshop. This process is not only cumbersome and time-consuming, but also introduces dust and impurities into the scraps during transfer and stacking, leading to a decrease in the purity of the recycled material. This directly affects the purity and pass rate of subsequent injection molded products. After the solidified plastic product is precisely cut and separated from the sprue material, the sprue material in the main sprue 41 will be tightly adhered to the right end face of the two front and rear air vents 451 under the negative pressure adsorption effect in the connecting through hole 43, thereby achieving temporary fixation of the sprue material.

[0058] During the ejection and material handling stage, after the moving mold plate 14 moves to the preset mold opening position, the external material handling robot first firmly picks up the two plastic products at the front and back using a negative pressure suction cup. Then, the external vacuum pump is turned off, and air is stopped from being drawn into the air nozzle 457 connected to the air passage 455. As the negative pressure environment in the through hole 43 disappears, the sprue material will lose its negative pressure adsorption force. At the same time, compressed air is introduced into the air nozzle 457 connected to the air passage 456 again. Under the pressure of the compressed air, the mounting base 454 will drive the sealing plate 452 to move to the right and return to its original position through the connecting rod 453. The sealing effect on the through hole 43 is restored by blocking the air outlet plate 451, preparing for the next round of operation. Then, the ejection mechanism is started. The drive mechanism will push the ejector plate 18 to slide to the right along the guide post. Several ejector pins on the ejector plate 18 will pass through the guide post. Through the corresponding ejector pin holes 181, the plastic product inside the mold core 111 and the sprue material inside the main runner 41 are precisely applied. At this time, the plastic product will be ejected from the mold core 111 and directly taken out by the external material handling robot and transferred to the subsequent process. After being ejected from the main runner 41, the sprue material will fall onto the receiving plate 112 under its own gravity, completing the collection and recycling of the sprue material. After subsequent crushing, it can be put back into the hopper 3 in an appropriate proportion to complete the recycling. The recycling of sprue material can avoid the problem of untimely collection of scrap materials, which can easily lead to accumulation. This not only occupies production space, but also affects the normal opening and closing operation of the injection mold due to the accumulation of scrap materials, posing certain production safety hazards. At the same time, if the accumulated scrap materials are left for a long time, they may age and degrade, further reducing their recycling value.

[0059] In summary, this application has the following beneficial effects:

[0060] Effect 1: During the mold preparation stage, compressed air is first introduced into the air nozzle 457 of the connecting air passage 2 456. The compressed air pushes the mounting base 454 to slide to the right along the inner wall of the sealing cavity 44. At this time, the mounting base 454 will drive the sealing plate 452 to slide to the right synchronously through the connecting rod 453 until the small rectangular block on the sealing plate 452 is smoothly inserted into the cavity on the air outlet plate 451, and the right end of the small rectangular block on the sealing plate 452 is flush with the right end of the air outlet plate 451. Thus, by blocking the air outlet plate 451, the connecting through hole 43 is sealed, avoiding the problem of backflow into the connecting through hole 43 and leakage after the molten plastic is injected.

[0061] Effect 2: In the initial state, the second air nozzle 476 connected to the third air passage 475 does not supply compressed air. At this time, the die-cutting blade 474 will be stored in the corresponding storage hole 471 to avoid interference with the mother mold core 111. Similarly, the third air nozzle 54 connected to the air hole of the sealing substrate 53 does not supply compressed air. At this time, the semi-waist-shaped blocking plate on the partition plate 551 is not embedded in the insertion hole 51 and does not temporarily block the flow channel of the nozzle 151. The flow channel of the nozzle 151 is in a conductive state, and the two magnetic sliding plates 554 on the left and right are close to each other and magnetically connected. The two magnetic sliding plates 554 on the left and right can block the flow channel of the nozzle 151 to prevent the subsequent molten plastic from flowing back into the insertion hole 51 and the ventilation cavity 52, causing blockage or damage.

[0062] Effect 3: During the injection molding feeding stage, after the cavity and gating system are filled with molten plastic, compressed air needs to be introduced into the air nozzle 3 54 connected to the air hole of the sealing substrate 53. The partition plate 551 will slide along the inner wall of the venting cavity 52 away from the sealing substrate 53 until the semi-waist-shaped blocking plate on the partition plate 551 is inserted into the insertion hole 51 and tightly fits against the inner wall of the runner of the nozzle 151. This achieves the effect of separating and blocking the molten plastic in the runner of the nozzle 151 through the partition plate 551. This avoids the situation where, due to the lack of an effective blocking structure for the runner of the nozzle 151, the solidified gating material in the gating system easily adheres to the residual molten material in the nozzle 151 that has not been completely cooled during the mold opening process. This not only makes it difficult to remove the gating material, but also requires additional cleaning of the runner of the nozzle 151, increasing the process time. In severe cases, it can also cause runner blockage, affecting the effect of continuous cycle operation of the injection mold.

[0063] Effect 4: During the cooling and setting stage, the built-in cooling system of injection mold 1 is activated (not shown in the figure; this is a conventional injection mold cooling structure). The molten plastic on the left side will be cooled by the cooling system, while the molten plastic on the right side will not be cooled by the cooling system. It can be kept warm by an additional insulation structure to prevent it from over-cooling and affecting subsequent injection operations. At the same time, the partition plate 551 divides the molten material in the flow channel of nozzle 151 into two parts, left and right. Only the molten plastic on the side closer to the cavity participates in cooling and setting, while the molten plastic on the right side of nozzle 151 can be kept in a molten state by the insulation structure. In the next injection operation, it is not necessary to completely reheat the raw material in barrel 2, shortening the plastic melting preheating time, reducing equipment energy consumption, and improving the injection feeding response speed.

[0064] Effect 5: Before cooling is almost complete, stop supplying compressed air to the air nozzle 457 of the connecting air passage 2 456. The mounting base 454 will then slide the sealing plate 452 to the left via the connecting rod 453 until the small rectangular block on the sealing plate 452 exits and moves away from the cavity of the air outlet plate 451, thereby releasing the seal on the connecting hole 43. Then, control the external vacuum pump to extract air from the connecting hole 43 through the air nozzle 457 of the connecting air passage 1 455, creating a negative pressure environment inside the connecting hole 43. The two air vents 451 will work together to tightly adsorb the sprue material in the main sprue 41. The negative pressure adsorption group 45 adsorbs and fixes the sprue material in the main sprue 41 in advance before the hot cutting operation, so that the sprue material is kept in a stable position and avoids the sprue material shifting due to force during the hot cutting process, which would cause cutting deviation. This not only ensures that the cut surface of the gate 42 is flat, but the adsorption force can also counteract the cutting impact force of the die-cutting blade 474, prevent the molded plastic product from deforming due to vibration, and further improve the integrity of the plastic product.

[0065] Effect Six: During the hot cutting stage of the sprue, compressed air is first introduced into the air nozzle 476 connected to the air passage 3 475. The mounting column 473 will drive the die-cutting blade 474 to slide to the left along the inner wall of the receiving hole 471, thereby achieving the effect of accurately cutting and separating the solidified plastic product from the sprue material. This avoids the problem that in conventional injection molds, scrap materials (especially solidified sprue material) usually need to go through multiple offline processes such as cooling, manual or mechanical peeling, centralized collection, and transfer to the crushing workshop. Not only is the process cumbersome and time-consuming, but during the transfer and accumulation process, scrap materials will also introduce dust and impurities, resulting in a decrease in the purity of recycled materials, which directly affects the purity and pass rate of subsequent injection molded products. After the solidified plastic product is accurately cut and separated from the sprue material, the sprue material in the main sprue 41 will be tightly attached to the right end face of the two air outlet plates 451 under the negative pressure adsorption effect in the connecting through hole 43, thereby achieving temporary fixation of the sprue material.

[0066] Effect 7: Ejection and material handling stage. The ejection mechanism is activated, and the plastic product will exit the mold core 111 and be directly picked up by the external material handling robot and transferred to the subsequent process. After being ejected from the main runner 41, the sprue material will fall onto the receiving plate 112 under its own gravity, completing the collection and recycling of the sprue material. The recycling of the sprue material can avoid the problem of untimely collection of scrap materials, which can easily lead to accumulation. This not only occupies production space, but also affects the normal opening and closing operation of the injection mold due to the accumulation of scrap materials, posing certain production safety hazards. At the same time, if the accumulated scrap materials are left for a long time, they may age and degrade, further reducing their recycling value.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A recyclable mold for molding and reusing plastic products, characterized in that, include: Injection mold assembly (1), including fixed mold plate (11), support plate (12) installed on the left side of fixed mold plate (11), movable mold plate (14) slidably installed on the right side of fixed mold plate (11) through guide post, female mold core (111) symmetrically embedded at the front and back of the right end of fixed mold plate (11), male mold core (141) symmetrically embedded at the front and back of the left end of movable mold plate (14), sprue hot cutting part (4) is provided on fixed mold plate (11), support plate (12) and movable mold plate (14), sealing plate two (15) is installed on the right end of movable mold plate (14), sprue nozzle (151) is installed through the middle of sealing plate two (15) and movable mold plate (14), sprue separation part (5) for separating and blocking sprue material of sprue nozzle (151) is provided on movable mold plate (14) and sealing plate two (15); Among them, the right end of the sealing plate (15) is connected to the material cylinder (2), and the right side of the outer wall of the material cylinder (2) is connected to the hopper (3). The hot-cut section (4) includes a main gating system (41) located in the middle of the right end of the fixed template (11). The gating system (41) has symmetrical gates (42) on the inner walls of the front and rear ends. The main gating system (41) has symmetrical connecting holes (43) on the inner wall of the left end. The connecting holes (43) are connected to the main gating system (41). The right end of the support plate (12) has sealing cavities (44) corresponding to the two connecting holes (43). The fixed template (11) and the support plate (12) are jointly provided with negative pressure adsorption groups (45). The right end of the male mold core (141) is provided with a receiving groove (46). The moving template (14) and the male mold core (141) are jointly provided with hot-cutting groups (47). The negative pressure adsorption group (45) includes an air outlet plate (451) installed on the right side of the inner wall of the connecting hole (43). The air outlet plate (451) has a U-shaped structure. A sealing block plate (452) is slidably installed on the left side of the air outlet plate (451) on the inner wall of the connecting hole (43). The sealing block plate (452) is composed of a large rectangular block and a small rectangular block. The outer wall of the small rectangular block is movably attached to the inner wall of the cavity of the air outlet plate (451). When the right end of the small rectangular block on the sealing block plate (452) is flush with the right end of the air outlet plate (451), it can block the air outlet plate (451) and seal the connecting hole (43). An installation base (454) is slidably installed on the inner wall of the sealing cavity (44) by a tension spring. The right end of the installation base (454) is fixedly connected to the sealing block plate (452) by a connecting rod (453). The negative pressure adsorption group (45) further includes an air passage (455) located on the upper end of the fixed template (11) corresponding to the air outlet plate (451). The lower end of the air passage (455) is connected to the corresponding connecting through hole (43), and the lower end of the air passage (455) is located on the left side of the air outlet plate (451). An air passage (456) is provided on the upper end of the support plate (12) corresponding to the mounting base (454). The lower end of the air passage (456) is connected to the corresponding sealing. On the cavity (44), and the lower end of the air port of the second air passage (456) is located on the left side of the mounting base (454), the upper end of the fixed template (11) is equipped with an air nozzle (457) connected to the first air passage (455), and the upper end of the support plate (12) is also equipped with an air nozzle (457) connected to the second air passage (456). When the negative pressure adsorption group (45) creates a negative pressure environment in the connecting through hole (43), the air outlet plate (451) can tightly adsorb the pouring material in the main pouring channel (41).

2. The recyclable mold for molding reusable plastic products according to claim 1, characterized in that: The left end of the support plate (12) is equipped with a sealing plate (13) through two mold feet (16). The right end of the sealing plate (13) is equipped with an ejector base plate (17). The right end of the ejector base plate (17) is slidably equipped with an ejector panel (18) through a guide post. The right end of the ejector panel (18) is equipped with several ejector pins for ejecting plastic products and sprue material. The fixed template (11) and the support plate (12) are provided with ejector through holes (181) corresponding to several ejector pins.

3. The recyclable mold for molding reusable plastic products according to claim 2, characterized in that: The sprue separation section (5) includes an insertion hole (51) on the left side of the outer wall of the nozzle (151). The insertion hole (51) is connected to the flow channel of the nozzle (151). A venting cavity (52) connected to the insertion hole (51) is provided at the upper end of the moving template (14). A sealing substrate (53) with a vent hole in the middle is installed on the upper side of the inner wall of the venting cavity (52). A three-way air nozzle (54) connected to the vent hole on the sealing substrate (53) is installed at the upper end of the moving template (14). A separation group (55) is provided on both the moving template (14) and the nozzle (151).

4. The recyclable mold for molding reusable plastic products according to claim 1, characterized in that: The hot-cutting assembly (47) includes a receiving hole (471) located at the left end of the male mold core (141) corresponding to the gate (42). The receiving hole (471) is connected to the corresponding receiving groove (46). A sealing plug (472) with an air hole in the middle is installed on the right side of the inner wall of the receiving groove (46). The left end of the sealing plug (472) is connected to the mounting post (473) by a tension spring. The outer wall of the mounting post (473) is slidably connected to the inner wall of the corresponding receiving groove (46). A die-cutting blade (474) is installed at the left end of the mounting post (473) and slidably connected to the inner wall of the receiving hole (471). An air passage three (475) is opened at the upper end of the moving template (14) corresponding to the male mold core (141). The lower end of the air passage three (475) is connected to the air hole of the corresponding sealing plug (472). An air nozzle two (476) connected to the air passage three (475) is installed at the upper end of the moving template (14).

5. The recyclable mold for molding reusable plastic products according to claim 3, characterized in that: The separation assembly (55) includes a partition plate (551) that is slidably installed on the lower side of the inner wall of the ventilation cavity (52). The partition plate (551) is composed of a rectangular slide bar and a semi-waist-shaped blocking plate. The left and right ends of the semi-waist-shaped blocking plate on the partition plate (551) are wedge-shaped structures. The semi-waist-shaped blocking plate of the partition plate (551) is slidably connected to the inner wall of the insertion hole (51). The left end of the nozzle (151) is provided with an installation groove (552) that is connected to the insertion hole (51). The installation groove (552) is arc-shaped. Fixing plates (553) are installed on the left and right sides of the inner wall of the installation groove (552). The end of the fixing plate (553) facing the insertion hole (51) is connected to a magnetic suction slide plate (554) by a compression spring. The magnetic suction slide plate (554) is slidably connected to the inner wall of the installation groove (552), and the upper side of the opposite ends of the two magnetic suction slide plates (554) are wedge-shaped structures.

6. The recyclable mold for molding reusable plastic products according to claim 1, characterized in that: The fixed template (11) has a receiving plate (112) installed on the lower right side, and the moving template (14) has a storage groove on the left side corresponding to the receiving plate (112).

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